JP7353029B2 - Free-standing packaging bags, free-standing packaging bags with spouts, free-standing packaging bags with content, and free-standing packaging bags with content and spouts - Google Patents

Description

The present invention relates to a self-supporting packaging bag, a self-supporting packaging bag with a spout, a self-supporting packaging bag with contents, and a self-supporting packaging bag with a spout containing contents.

Some food and beverages sold at stores have their contents stored in containers such as plastic bottles or spouted packaging bags made of flexible packaging materials such as plastic film. . When the content is a jelly drink, the diameter of the mouth of the PET bottle is often designed to be wide. In addition, plastic bottles are too hard to squeeze the contents from the outside with your hands, and the jelly drink cannot be broken up and enters the mouth as a lump, which can make it difficult to drink. . On the other hand, packaging bags with spouts are soft enough to be rubbed by hand from the outside when the content is a jelly drink, and the jelly drink can be rubbed to break up the lumps and make it easier to drink. can.

Such spouted packaging bags have a side gusset shape consisting of a pair of flat parts and a pair of side parts, and the flat parts and side parts are folded downward, and the weight of the contents is applied to the flat bottom part. In many cases, a packaging bag is used in which the bottom part serves as a mounting surface and stands on its own (for example, Patent Document 1).

Hot food and beverages with warm contents are also sold at stores, and in this case, the containers may be placed on a warming device to heat the containers containing the food and beverages from below. If a side gusset-shaped packaging bag with a spout is placed on a heating device, the bottom of the packaging bag will be locally heated because the planar bottom will come into direct contact with the heating device. If it continues to be placed in the warmer for a long time in this state, heat will continue to be applied to the bottom, and even if it is made of heat-resistant flexible packaging material, the flexible packaging material will deteriorate. , problems such as delamination may occur. In addition, heat continues to be applied from below to the contents stored in the side gusset-shaped spouted packaging bag. If the content is a jelly drink, it is semi-solid, so it is difficult for the content to flow inside the packaging bag, and the content is divided between the lower content, where heat from the warmer is easily transmitted, and the upper content, where heat is less likely to be transmitted. Convection is also difficult to occur, so if you try to warm the contents above to a high temperature or heat it for a long time, the heat that is too high or for a long time will continue to be applied only to the contents below. This may lead to a decrease in quality. For these reasons, there has never been a packaging bag made of flexible packaging material for hot food and beverages.

On the other hand, as a flexible packaging material used for packaging bags, a laminate having a sealant layer as the innermost layer is generally used to ensure sealing performance by heat fusion. As the synthetic resin used for the sealant layer, thermoplastic resins such as polyethylene resins and polypropylene resins are used. However, polyethylene resin has poorer heat resistance than polypropylene resin. Therefore, polyethylene resin is considered to be inappropriate as a synthetic resin for the sealant layer in packaging bags for retorts and the like that are heated, and polypropylene is used (Patent Document 1).

Among polyethylene resins that are said to have poor heat resistance, high-density polyethylene is known as a heat-resistant resin. However, packaging bags that use films or resins made of high-density polyethylene or polypropylene as a sealant layer are vulnerable to shocks such as when dropped, and there is a problem that the bags tend to tear from the seal part etc. when dropped. Ta.

Patent No. 5262712

The present invention has self-supporting properties, can suppress heat from being applied only to the bottom and the contents below even if heating is applied from below, has heat resistance that can withstand heating in a heater, and has a drop resistance. An object of the present invention is to provide a self-supporting packaging bag, a self-supporting packaging bag with a spout, a self-supporting packaging bag with contents, and a self-supporting packaging bag with a spout with contents, all of which have impact resistance capable of withstanding the above-mentioned conditions.

The present invention has the following configuration.
[1] A self-supporting packaging bag for hot food and drink products formed of a laminate having a sealant layer and having a bottom part,
a lower end seal portion extending downward from the periphery of the bottom portion;
A self-supporting packaging bag, in which the lower end seal portion serves as a foot in a self-supporting state, and the bottom portion is spaced apart from a surface on which the self-supporting packaging bag is placed.
[2] The self-supporting packaging bag according to [1], wherein the sealant layer has a melting point of 120°C or higher.
[3] The self-supporting packaging bag according to [1] or [2], wherein the bottom portion is rectangular, and four lower end seal portions are formed from each side of the bottom portion.
[4] The self-supporting packaging bag according to any one of [1] to [3], further having a horizontal gusset portion.
[5] The self-supporting packaging bag according to any one of [1] to [4], wherein the total thickness of the sealant layer is 70 μm to 100 μm.
[6] The self-supporting packaging bag according to any one of [1] to [5], wherein the laminate has a metal foil layer.
[7] A free-standing packaging bag with a spout, which is obtained by attaching a spout to the free-standing packaging bag according to any one of [1] to [6].
[8] A free-standing packaging bag containing contents, the free-standing packaging bag containing contents being stored in the free-standing packaging bag according to any one of [1] to [6].
[9] A free-standing packaging bag with a spout containing contents, the content being stored in the free-standing packaging bag with a spout according to [7].

The self-supporting packaging bag, the self-supporting packaging bag with a spout, the self-supporting packaging bag with content, and the self-supporting packaging bag with a content and spout of the present invention have self-supporting properties, and even when heated from below, the bottom or bottom It has heat resistance that can withstand heating in a heater, and impact resistance that can withstand being dropped.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which showed an example of the free-standing packaging bag with a spout of this invention. FIG. 2 is a perspective view showing the contents stored in the free-standing packaging bag with a spout shown in FIG. 1; FIG. 2 is a side view showing the contents stored in the free-standing packaging bag with a spout shown in FIG. 1; FIG. 3 is a sectional view taken along line II of the free-standing packaging bag with a spout in FIG. 2. FIG. 2 is a bottom view showing the contents stored in the free-standing packaging bag with spout of FIG. 1; FIG. 2 is a side view showing the self-supporting spouted packaging bag of FIG. 1 with contents stored therein and placed on a flat surface. FIG. 3 is an enlarged perspective view showing the vicinity of the bottom of the free-standing packaging bag with a spout shown in FIG. 2; FIG. 2 is a perspective view showing one step in manufacturing the bottom side of the free-standing packaging bag with a spout shown in FIG. 1; FIG. 1 is a perspective view showing an example of a self-supporting packaging bag of the present invention. It is a front view showing an example of a conventional spouted gusset bag. FIG. 11 is a perspective view showing the contents stored in the spouted gusset bag of FIG. 10;

The meanings of the following terms in this specification are as follows.
The density of the synthetic resin is a value measured in accordance with JIS K7112D.
Melt flow rate (MFR) is a value measured under conditions of a temperature of 190° C. and a load of 21.18 N in the case of polyethylene resin in accordance with JIS-K7210.

The self-supporting packaging bag and the self-supporting packaging bag with a spout of the present invention are self-supporting packaging bags having the same configuration except for the presence or absence of a spout. Furthermore, the free-standing packaging bag with contents and the free-standing packaging bag with a spout of the present invention are the same as the free-standing packaging bag and the free-standing packaging bag with a spout of the present invention, except that the contents are stored therein. . EMBODIMENT OF THE INVENTION Hereinafter, as an embodiment of the self-supporting packaging bag and the self-supporting packaging bag with a spout of the present invention, an example of a spouted gusset bag provided with a spout will be shown and described in detail.
Note that the dimensions of the figures illustrated in the following description are merely examples, and the present invention is not necessarily limited thereto, and can be practiced with appropriate changes within the scope of the gist thereof. .

As shown in FIGS. 1 to 3, the free-standing packaging bag 1 with a spout according to the present embodiment includes a free-standing packaging bag 10 that stores contents, and a spout 12 that is liquid-tightly attached to the top of the free-standing packaging bag 10. and a cap 13 attached to the spout 12.

The self-supporting packaging bag 10 includes a pair of flat parts 14, 14, a pair of side parts 16, 16, and a bottom part 18, as shown in FIGS. 1 to 6. In the self-supporting packaging bag 10, the pair of flat parts 14, 14 and the pair of side parts 16, 16 are opposed to each other, and the pair of side parts 16, 16 are folded inward, respectively, so that the flat part 14 , 14 are connected to each other. The bottom surface portion 18 is provided so as to close the lower open end of the cylindrical body formed by the pair of plane portions 14, 14 and the pair of side portions 16, 16.

The pair of plane parts 14, 14 have a substantially rectangular shape in front view, with each rectangular corner cut out in an arc shape. The front view shape of the pair of plane parts 14, 14 is not limited to such a substantially rectangular shape.
Similar to the flat parts 14, 14, the pair of side parts 16, 16 have a substantially rectangular shape in which each corner of the rectangular shape is cut out in an arc shape. The front view shape of the pair of side parts 16, 16 is not limited to such a substantially rectangular shape.

The self-supporting packaging bag 10 has four side edges extending in the height direction by heat-sealing the side edges of the plane member 141 and side member 161 forming the adjacent plane part 14 and side part 16, respectively. A seal portion 20 is formed. The pair of plane parts 14, 14 and the pair of side parts 16, 16 are joined by four side end seal parts 20 to form a cylindrical shape.

An upper end seal part 22 is formed at the upper end of the self-supporting packaging bag 10 by heat-sealing the upper end of the plane part 14 and the upper end of the side part 16. At the lower end of the self-supporting packaging bag 10, a lower end seal portion 24 is formed, which is heat-sealed to the lower end of the plane member 141 and the lower end of the side member 161 with the four sides of the rectangular bottom member 181 folded downward. has been done. The upper end opening and the lower end opening of the cylindrical body formed by the pair of plane parts 14, 14 and the pair of side parts 16, 16 are closed by the upper end seal part 22 and the lower end seal part 24, respectively, so that the packaging becomes self-supporting. A bag 10 is formed. This allows the contents to be stored in the self-supporting packaging bag 10.

In the self-supporting packaging bag 10, the pair of plane parts 14, 14 constitute the front and back surfaces of the self-supporting packaging bag 1 with a spout, respectively.
In the self-supporting packaging bag 10, the pair of side parts 16, 16 are oriented toward the inside of the self-supporting packaging bag 10 at fold lines 16a, 16a extending in the widthwise center of each side in the height direction to the lowest end. It has lateral gusset parts 26, 26 formed by folding it in half.

In the upper end seal portion 22, the pair of half-folded side portions 16, 16 are sandwiched between the pair of flat portions 14, 14, and the spout 12 is sandwiched between the pair of flat portions 14, 14 and fixed in a liquid-tight manner. ing.

The self-supporting packaging bag 10 is formed by heat-sealing the lower ends of the pair of flat members 141, 141 and the lower end of the downwardly folded lower end of the bottom member 181, which corresponds to the pair of flat parts 14, 14. The two lower end seal portions 24a, the lower ends of the pair of side members 161, 161, and the lower ends of the downwardly folded lower ends of the bottom member 181 that correspond to the pair of side members 16, 16 are heat-sealed. A total of four lower end seal portions 24, including two lower end seal portions 24b, are formed. The four lower end seal parts 24 extend downward from the four sides of the rectangular bottom part 18, respectively.

Further, the lower end seal portion 24a and the lower end seal portion 24b are in contact with each other at four corners of the rectangular bottom member 181. In detail, as shown in FIGS. 2 and 7, the lower end seal part 24a has a lower end side 24ad longer than an upper end side 24au of the lower end seal part 24a, and is located at a corner of the bottom member 181. The lower end seal portion 24a has a trapezoidal shape with a diagonal line 24c formed from the upper end side to the lower end side at both ends. Similarly, as shown in FIG. 2, FIG. 3, FIG. 6, and FIG. It has a trapezoidal shape in which a diagonal line 24d is formed from the end of the upper end side to the end of the lower end side at both ends of the lower end seal part 24b located at the corner of. Since the diagonal line 24c and the diagonal line 24d match, the lower end seal portion 24a and the lower end seal portion 24b are in contact with each other. The diagonal lines 24c and 24d also coincide with the lower end of the side end seal portion 20. In this way, the lower end seal portion 24 is formed so as to go around the lower end of the self-supporting packaging bag 10. Further, as shown in FIGS. 2 and 5, the lower end seal portion 24b is V-shaped toward the inside of the self-supporting packaging bag 10 along the fold line 16a of the side surface portion 16.

When the self-supporting packaging bag 10 is in a self-standing state, as shown in FIGS. It extends in the vertical direction to form a cylindrical shape and becomes the foot. Specifically, as shown in FIGS. 2, 5, and 7, both ends of the lower end seal portions 24a located at the corners of the bottom member 181 extend in a direction that extends to both ends of the plane portion 14, and Both ends of the lower end seal portion 24b located at It forms a cylinder. Therefore, the bottom portion 18 is spaced apart from the plane 200 on which the self-supporting packaging bag 10 is placed. As a result, when the self-supporting packaging bag 1 with a spout is placed on the warmer in a self-supporting manner, the rectangularly expanded bottom part 18 separates from the heating surface (plane 200), and the bottom part 18 and the heating surface (plane 200) separate from each other. A gap is created between them and the plane 200) and they are separated from each other. In this way, since the rectangularly expanded bottom part 18 does not come into contact with the heating surface (plane 200), excessively high heat is applied only to the bottom part 18 and the contents below in the self-supporting packaging bag 10. Deterioration of the laminate forming the bottom member 181 and deterioration of the quality of the contents due to continued application of heat for a long time are suppressed. For example, if the contents are difficult to conduct convection within the self-supporting packaging bag 10 such as jelly-like drinks, even if the contents are heated to a temperature that sufficiently warms the contents above, the laminate forming the bottom member 181 It is possible to prevent deterioration and the temperature from becoming too high to the point where the quality of the contents below the bottom surface portion 18 deteriorates.

The distance between the widened bottom portion 18 of the self-supporting packaging bag 10 in the self-supporting state and the plane 200 on which the self-supporting packaging bag 10 is placed can be adjusted by the width d (FIG. 3) of the lower end seal portion 24. In addition, the bottom surface part 18 should just be spaced apart from the flat surface 200 on which it is placed to such an extent that deterioration of the laminate and deterioration of the quality of the contents do not occur.
The width d of the lower end seal portion 24 is preferably 3.0 mm or more, more preferably 4.0 mm or more. If the width d of the lower end seal portion 24 is greater than or equal to the lower limit, excessively high heat or long-term heat may continue to be applied only to the bottom portion 18 or the contents below in the self-supporting packaging bag 10. Deterioration of the laminate forming the bottom member 181 and deterioration of the quality of the contents can be easily suppressed.
The width d of the lower end seal portion 24 is preferably 10.0 mm or less, more preferably 8.0 mm or less. If the width d of the lower end seal portion 24 is equal to or less than the upper limit value, it is possible to prevent the seal width from becoming larger than necessary, and the internal volume can be prevented from decreasing more than necessary, although it depends on the size of the self-supporting packaging bag 10. can be suppressed. Furthermore, it is possible to increase the heat sealing pressure applied per unit area, making it easy to obtain sufficient sealing strength necessary for self-supporting.
Note that the width d of the lower end seal portion 24 is a dimension set when heat sealing is performed, and may become slightly larger than the set dimension due to residual heat of heat sealing.

In the self-supporting packaging bag 10, the lower end seal portion 24b is V-shaped toward the inside of the self-supporting packaging bag 10 along the fold line 16a of the side surface portion 16, so that it has excellent self-supporting properties.
Furthermore, in the self-supporting packaging bag 10, a point seal may be provided on the lower end seal portion 24. This strengthens the lower end seal portion 24. Here, the term "point seal" refers to a partial heat seal that is overlapped with the heat seal to partially strengthen it.
Specifically, it is preferable that a point seal is provided at a portion a (FIGS. 3 and 5) corresponding to the fold line 16a of the side surface portion 16 in the lower end seal portion 24b of the side surface portion 16. Further, it is preferable that a point seal is also provided at a portion b (FIGS. 1 and 5) of the lower end seal portion 24a of the flat portion 14, which overlaps portion a when the self-supporting packaging bag 10 is folded.

In the self-supporting packaging bag 10, a point seal may be provided only on either part a or part b, but it is particularly preferable that a point seal is provided on both part a and part b.
In the self-standing state, when viewed from the bottom of the self-supporting packaging bag 10, as shown in FIG. Form. By point-sealing both portions a and b of the lower end seal portion 24 arranged in this manner, the four corner portions of the bottom portion 18 are strengthened, and more stable self-reliance is ensured.

(laminate)
The plane member 141, the side member 161, and the bottom member 181 forming the pair of plane parts 14, 14, the pair of side parts 16, 16, and the bottom part 18 of the self-supporting packaging bag 10 are each made of a laminate having a sealant layer. It is formed. The sealant layer is provided as the innermost layer of the laminate. Examples of the laminate include a laminate having a base layer, an intermediate film layer, and a sealant layer in this order from the outside.

The sealant layer preferably has a melting point of 120°C or higher. Here, the melting point of the sealant layer is the melting peak temperature measured by differential scanning calorimetry (DSC) after cutting out the sealant layer or the sealant film described below in accordance with JIS K 7121. The melting point of the sealant layer is 120°C or higher, which means that if the sealant layer has multiple melting peak temperatures, such as when the sealant layer is a mixture of multiple synthetic resins or has multiple layers, the melting point is the lowest. The melting peak temperature is also 120°C or higher. If the melting point of the sealant layer is 120° C. or higher, heat resistance that can withstand heating in a heater can be obtained. Heat resistance that can withstand heating from a heating device refers to heat resistance to the extent that the synthetic resin that forms the sealant layer does not soften or deteriorate due to heating from a heating device. It means being able to maintain an independent state. Further, the melting point of the sealant layer is preferably 150°C or lower. If it is below 150°C, there is no need to increase the heat sealing temperature too high during heat sealing when manufacturing the self-supporting packaging bag 10, and heat sealing can be performed in a short time, improving production efficiency. .

If the melting point of the sealant layer is 120°C, it cannot be used as a packaging bag for retorts, which is heated to temperatures of 120°C or higher, but it has the heat resistance as a packaging bag for hot food and beverages, which is heated to about 100°C. It is enough.

The sealant layer is preferably an unstretched film of synthetic resin or a layer formed by extruding synthetic resin into layers. The number of synthetic resins forming the sealant layer may be one or two or more. In the case of two or more types, it may be a single layer of a mixture of two or more types of synthetic resins, a multilayer of two or more types of synthetic resins, or a multilayer including a layer of a mixture.
When the sealant layer is multi-layered, it can be manufactured by a known method such as a coextrusion method or a lamination method. In the case of the coextrusion method, a water-cooled inflation method, an air-cooled inflation method, a T-die molding method, etc. can be adopted. Particularly advantageous is the air-cooled inflation method, which allows the formation of thin films and wide original fabrics.

Examples of the synthetic resin include polyethylene resins such as high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE), polypropylene resins, and the like, with polyethylene resins being preferred.
As the polyethylene resin, it is preferable to combine HDPE, which has excellent heat resistance, and LLDPE, which has flexibility and excellent impact resistance. In this case, the sealant layer may be a single layer of a mixture of HDPE and LLDPE, a multilayer comprising a layer of HDPE and a layer of LLDPE, or a multilayer comprising a layer of a mixture of HDPE and LLDPE. good.

HDPE is a polymer of ethylene. HDPE is produced using Ziegler-based or Phillips-based catalysts. HDPE has a density of 0.940 to 0.970 g/cm ³ and an MFR of 0.1 to 20 g/10 min.

LLDPE is a copolymer of ethylene and one or more α-olefins selected from α-olefins having 3 to 20 carbon atoms. Among α-olefins having 3 to 20 carbon atoms, α-olefins having 3 to 12 carbon atoms are preferred. Specific examples include propylene, 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, etc. Preferably propylene, 1-butene, 1-dodecene, etc. -hexene, 1-octene. The content of α-olefin units in the copolymer is usually 1 to 30 mol%, preferably 3 to 20 mol%, based on the total units.
LLDPE is produced using a Ziegler-based catalyst or a metallocene-based catalyst. LLDPE produced using a metallocene catalyst is preferred because it has excellent impact resistance.
LLDPE has a density of 0.900 to 0.920 g/cm ³ and an MFR of 0.1 to 20 g/10 min, or a density of 0.920 g/cm ³ or more and an MFR of 0.1 to 20 g/10 min. .

A specific example of the polyethylene resin sealant layer is a three-layer coextruded film having the following outer layer, middle layer, and inner layer.
Outer layer: ^HDPE with density 0.940-0.970g/cm ³ and MFR 0.1-20g/10 min; A layer consisting of a mixture of LLDPE for 10 minutes.
Intermediate layer: HDPE with density 0.940-0.970g/cm ³ and MFR 0.1-20g/10 min, and HDPE with density 0.900-0.920g/cm ³ and MFR 0.1-20g /10 min LLDPE mixture.
Inner layer: A layer made of LLDPE with a density of 0.920 g/cm ³ or more and an MFR of 0.1 to 20 g/10 minutes, or a layer of LLDPE with a density of 0.940 to 0.970 g/cm ³ and an MFR of 0.1 to 20 g /10 min HDPE and LLDPE with a density of 0.900-0.920 g/cm ³ and an MFR of 0.1-20 g/10.

The ratio of HDPE to the total of HDPE and LLDPE in the outer layer is preferably 30 to 60% by mass, more preferably 40 to 50% by mass. If the proportion of HDPE is equal to or higher than the lower limit value, the stickiness on the surface of the film of the sealant layer (sealant film) can be reduced, the sealant film can be rolled out easily, and it is suitable for hot food and drink products. It is easy to obtain heat resistance, and it is easy to suppress thermal deformation when heated to high temperatures.

The ratio of HDPE to the total of HDPE and LLDPE in the intermediate layer is preferably 10 to 50% by mass, more preferably 30 to 40% by mass. If the proportion of HDPE is equal to or higher than the lower limit, heat resistance suitable for hot food and drink products can be easily obtained, and thermal deformation when heated to high temperatures can be easily suppressed. The blending ratio of the intermediate layer is determined including film forming suitability.

The inner layer is the layer located at the innermost side of the packaging bag and is sealed, and has the lowest density and low-temperature sealability among the three layers. By making the inner layer a layer made of LLDPE with a density of 0.920 g/cm ³ or more, it is easy to obtain a packaging bag with excellent impact resistance and strength that can withstand impacts such as drops, and it also prevents stickiness due to the heat of heat sealing. Easy to prevent and suppress blocking. In addition, since the synthetic resin that forms the sealant layer uses multiple resins, when the melting point of the sealant layer is measured, it has multiple melting point peaks, but all of the melting points are 120°C or higher and at lower temperatures. Easily forms a sealant layer that can be heat sealed. Therefore, heat sealing can be performed in a shorter time, improving production efficiency. Furthermore, damage caused to the base material layer of the laminate due to heat sealing can be reduced, and wrinkles in the base material layer can be easily suppressed, improving the appearance. Furthermore, since the melting point is 120° C. or higher, heat resistance suitable for use in hot food and beverages can be obtained.

If LLDPE with a density of less than 0.920 g/cm ³ is used for the inner layer, the impact resistance will improve, but the heat resistance will decrease and the film will become sticky, so in this case it is preferable to use HDPE in combination. .

When the inner layer is a layer of a mixture of HDPE and LLDPE, the ratio of HDPE to the total of HDPE and LLDPE in the inner layer is preferably 40 to 70% by mass, more preferably 50 to 60% by mass. By setting the proportion of HDPE to the above lower limit value or more, stickiness of the film can be prevented and blocking can be easily suppressed. In this case, all melting peak temperatures of the sealant layer measured by DSC, that is, melting points, can be set to 120° C. or higher. Therefore, heat resistance suitable for hot food and drink products can be obtained.
Among polypropylene-based resins, block polypropylene and random polypropylene, which are copolymers of propylene and ethylene and other olefins, have a lower melting point than homopolypropylene, about 135 to 150°C, and have a lower melting point than homopolypropylene. Among polypropylene resins, block polypropylene and random polypropylene are preferred because they improve impact strength.

The total thickness of the sealant layer is preferably 30 μm or more, more preferably 70 μm or more. If the total thickness of the sealant layer is equal to or greater than the lower limit value, sufficient strength is likely to be obtained to allow the packaging bag to stand on its own with the lower end seal portion 24 acting as a foot. In addition, if the sealant layer is 70 μm or more, even if the bottom member 181, the plane member 141, and the side member 161 are slightly shifted from their predetermined positions during manufacturing, the amount of resin forming the sealant layer This is preferable because the molten resin joins each member without any gaps during heat sealing at the stage of manufacturing a self-supporting packaging bag, making it possible to manufacture a self-supporting packaging bag that does not leak the contents. . In addition, a packaging bag having the same shape as the self-supporting packaging bag of the present invention has an intersection 18b between the half-fold line 18a of the bottom part 18 and the inner end of the lower end seal part 24b, and the lower end seal part of the side end seal part 20 and the two sides. At the four corners c of the bottom part 18 (FIG. 5) where 24a and 24b intersect, delamination, pinholes, and bag tearing of the laminate forming the bottom member 181 occur, and when metal foil is used in the laminate. There is a risk that problems such as tearing of the metal foil may occur. These problems are related to the intersection point 18b: (i) Before filling the contents, the intersection point 18b is located on the half-fold line 18a that is mountain-folded toward the outside of the self-supporting packaging bag as described later. However, after the contents are filled, the half-fold line 18a widens, and the intersection point 18b is located on the line where the bottom part 18 and the lower end seal part 24b are folded in a valley, so the folding is reversed before and after filling the contents. (ii) Before filling with the contents, the triangular wings of the bottom part 18 sandwich the side part 16, so the intersection 18b is a point where the laminated body is likely to sag; (iii) Contents This is thought to be due to the fact that the load of the object is easily applied, and (iv) a seal failure when forming the lower end seal portion 24. Concerning the corner c, it is thought that this is caused by the fact that the load of the contents is easily applied thereto, the sealing failure when forming the lower end seal portion 24, and the like. Furthermore, in the case of a self-supporting packaging bag with a spout, the laminate forming the side member 161 is Problems such as delamination, pinholes, bag tearing, and tearing of the metal foil may occur if metal foil is used in the laminate. The intersection point 16b is considered to be caused by the fact that the load of the contents is likely to be applied when the free-standing packaging bag 1 with a spout falls. These problems can be solved by making the impact-resistant sealant layer 70 μm or more thick in the self-supporting packaging bag of the present invention.
Although there is no particular upper limit to the total thickness of the sealant layer, making it too thick will only increase the cost, so it is preferably 150 μm or less, more preferably 100 μm or less.
The total thickness of the sealant layer is more preferably 70 μm to 100 μm.
When the sealant layer is the three-layer coextruded film, the ratio of the intermediate layer to the total thickness of the sealant layer is preferably 33 to 80% from the viewpoint of excellent impact resistance.
Here, the total thickness of the sealant layer is the thickness before forming the self-supporting packaging bag. After forming the self-supporting packaging bag, this thickness is almost maintained at the flat surface, side surface, and bottom surface, but in each sealing section, two sheets of each member are heat-sealed with the sealant layers facing each other. Since it is fused and joined, the thickness is thinner than twice the total thickness.

As the base material layer, a film having excellent printability and further having heat resistance, puncture strength, tensile strength, impact resistance, etc. is preferable. Examples of the material for the base layer include polyethylene terephthalate, polypropylene, polyamide, and ethylene vinyl alcohol copolymer, and biaxially stretched films or uniaxially stretched films of these are preferred. In addition, in order to provide these films with barrier properties against oxygen and water vapor, vapor-deposited films with metals such as aluminum and magnesium, or oxides such as silicon oxide, barrier coating agents such as polyvinylidene chloride, etc. A coated film etc. may be used. The base material layer may be a single film described above, or may be a laminated film.

Examples of the intermediate film layer include films with functionality such as oxygen barrier properties, water vapor barrier properties, tear properties, and impact resistance. Specific examples of the intermediate film layer include, in addition to the films listed for the base layer, metal foils made of aluminum or the like having excellent oxygen barrier properties and water vapor barrier properties. These may be used alone or in combination of two or more.
Preferably, a metal foil is used as the intermediate film layer. In order to manufacture the self-supporting packaging bag 10 in this embodiment, the bottom member 181 is folded into a flat shape with both side surfaces 16 extending inside, as shown in FIG. 8(A). When the self-supporting packaging bag 10 having the bottom part 18 formed by folding the bottom member 181 in this manner is filled with contents, the bottom part 18 expands in the horizontal direction with respect to the self-standing direction of the self-supporting packaging bag 10. The lower end seal portion 24 is strengthened by being sealed, maintains the shape at the time of manufacture, and extends perpendicularly to the self-supporting direction of the self-supporting packaging bag 10, and the lower end seal portions 24a, 24b are attached to the bottom surface portion 18. The lower part becomes the foot. Furthermore, when the intermediate film layer includes metal foil, the stiffness and dead-holding properties of the metal foil allow the lower end seal portions 24a and 24b to be secured in the direction perpendicular to the self-supporting direction even if the weight of the contents is large. It maintains its elongation and acts as a foot below the bottom part 18, creating a gap between the bottom part 18 and the heating surface (plane 200). In this manner, the embodiment in which the intermediate film layer has metal foil ensures that even when the contents are heavy, such as liquids, the bottom portion 18 lands on the heating surface (flat surface 200) and the lower end seal portions 24a and 24b are sealed. This is preferable because it can prevent the bottom portion 18 from spreading in the same direction as the spreading direction.

The laminate can be manufactured by laminating a film forming a base material layer, a sealant film, and a film forming an intermediate film layer used as necessary by a known method such as a dry lamination method or an extrusion lamination method. . Among these, dry lamination is preferred because a laminate with excellent heat resistance can be formed by selecting the adhesive. The total thickness of the laminate is not particularly limited, but is preferably 50 μm or more and 200 μm or less. The thickness of the sealant layer has a high proportion of the total thickness of the laminate, and the total thickness of the laminate influences the thickness of the sealant layer.

Adhesives used in the dry lamination method include one-component or two-component curing adhesives for dry lamination. Laminating adhesives are preferred. In particular, a polyurethane-based two-component curing adhesive containing polyester polyol or polyether polyol as a main component is preferred. Specific examples include RU-40 manufactured by Rock Paint Co., Ltd. and TM250 manufactured by Toyo Morton Co., Ltd.

In the self-supporting packaging bag 10, since the melting point of the sealant layer of the laminate is 120°C or higher, heat resistance that can withstand heating in a heater at about 100°C is obtained.
In a packaging bag such as the self-supporting packaging bag 10, sealing defects occur at the four corners c (FIG. 5) of the bottom portion 18 where the side end seal portion 20 intersects with the lower end seal portions 24a, 24b of the two sides. Since the load of the contents tends to be applied to the corner c, the bag tends to break easily from the corner c. Furthermore, at the intersection 18b between the half-folding line 18a of the bottom portion 18 and the inner end of the lower end seal portion 24b, the folding direction is opposite before and after filling the contents, and the laminate is likely to sag. Since the load of the contents is likely to be applied and sealing failure is likely to occur, the bag tends to break easily from the intersection 18b. Furthermore, in the case of the free-standing packaging bag 1 with a spout, at the intersection 16b of the inner end of the upper seal portion 22 and the fold line 16a of the side surface 16, when the free-standing packaging bag 1 with a spout falls, The load of the contents is likely to be applied to the bag, and the bag tends to break at the intersection 16b. On the other hand, by forming the self-supporting packaging bag 10 from the laminate, excellent impact resistance can be obtained. Therefore, when the free-standing packaging bag 10 is dropped, it is possible to prevent the bag from breaking from the corner c, the intersection 18b, and the intersection 16b of the free-standing packaging bag 1 with a spout.
In this way, the self-supporting packaging bag 10 has excellent impact resistance that can suppress bag breakage and excellent heat resistance for hot food and beverage products.

In the self-supporting packaging bag 1 with a spout, a spout 12 is provided at the upper end seal portion 22 of the self-supporting packaging bag 10 for pouring out the contents stored inside the self-supporting packaging bag 10 or for drinking the contents. is provided. A cap 13 is provided at the upper end of the spout 12 and is screwed onto the spout 12 to close the opening of the spout 12.

At least the portion of the spout 12 that is joined to the inner surface of the flat portion 14 of the self-supporting packaging bag 10 is made of synthetic resin.
Examples of the synthetic resin forming the spout 12 include polyolefin resin, polyamide resin, polyester resin, (meth)acrylic resin, vinyl chloride resin, vinylidene chloride resin, polyether sulfone, and ethylene-vinyl alcohol copolymer. It will be done. Among these, polyolefin resins are preferred because of their excellent processability and low cost.

Examples of polyolefin resins include high-density polyethylene, medium-density polyethylene, high-pressure low-density polyethylene, linear low-density polyethylene, polyethylene resins such as ethylene-vinyl acetate copolymer, ethylene-α-olefin copolymer, etc. Examples include olefin elastomers, polypropylene resins such as polypropylene, ethylene-propylene random copolymers, α-olefin-propylene random copolymers, and cyclic polyolefin resins. These resins may be blended to improve performance, or partially crosslinked to improve heat resistance.

The spout 12 may be formed from a single material, or may have a multilayer structure made of various resin layers.
The resin forming at least the part of the spout 12 to be joined to the flat part 14 of the self-supporting packaging bag 10 is of the same type as the resin forming the innermost layer of the flat part 14, since it can be joined by heat sealing. Preferably, it is made of resin.

The material of the cap 13 is not particularly limited, and includes, for example, the synthetic resins mentioned as the material of the spout 12.

The method for manufacturing the free-standing packaging bag 1 with a spout is not particularly limited. The laminate is used as the flat member 141, the side member 161, and the bottom member 181 that form the pair of flat parts 14, 14, the pair of side parts 16, 16, and the bottom part 18, and the side end seal part 20 is heat-sealed. By forming the upper end seal portion 22 and the lower end seal portion 24, the self-supporting packaging bag 10 can be formed. In addition, by sandwiching the spout 12 between the pair of flat parts 14 and 14 when forming the upper end seal part 22, the spout 12 is liquid-tightly fixed to the self-supporting packaging bag 10, and the self-supporting packaging bag 1 with a spout is fixed to the self-supporting packaging bag 10. Can be formed.

As a method for manufacturing the free-standing packaging bag 1 with a spout, for example, a stacked body of a pair of side members 161, 161 is each folded in half along the fold line 16a, and arranged so that the fold lines 16a face each other. Then, as shown in FIG. 8(A), the laminate of the bottom member 181 is folded so that both side surfaces 16 are inserted inside, and the triangles on both sides are folded inward as shown in FIG. 8(B). A pair of half-folded side members 161, 161 are placed between the wings 182, 183. At this time, the bottom member 181 and the pair of side members 161, 161 may be temporarily fixed. Thereafter, the pair of side members 161, 161 and the bottom member 181 are sandwiched between the pair of planar members 141, 141 to form the side end seal portions 20, 20 and the lower end seal portion 24. Thereafter, a method can be used in which the spout 12 is held between the openings at the upper end and the upper end seal portion 22 is formed.

The heat sealing temperature of the lower end seal portion is preferably 200°C or more and 250°C or less. When the heat sealing temperature is 200° C. or higher, sufficient heat sealing strength and sealing performance are likely to be obtained. When the heat-sealing temperature is 250° C. or lower, it is easy to prevent the sealed portion from expanding due to the residual heat of the heat-sealing, resulting in a lower end sealed portion having a width wider than the intended heat-sealing width. Thereby, it becomes easier to suppress the opening of the bottom part from being hindered, and it becomes easier to obtain sufficient independence.
The preferable range of the heat seal temperature of the side end seal part and the top end seal part is the same as the preferable range of the heat seal temperature of the bottom end seal part.

Food and beverages to be stored as contents are not particularly limited, and include liquid drinks, jellies, soups, and the like. The temperature of hot food and beverages can be, for example, about 60 to 70°C.
The temperature at which the self-supporting packaging bag is heated by the heater is approximately 100°C, which is lower than the temperature required for retort sterilization (110°C or higher).

As explained above, the self-supporting packaging bag of the present invention has self-supporting properties, and in the self-standing state, the lower end seal portion serves as a foot, and the bottom portion is separated from the plane on which the self-supporting packaging bag is placed. In this way, a gap is created between the bottom part and the flat surface on which the free-standing packaging bag is placed in the free-standing state, so that only the bottom part and the contents near the bottom part may be exposed to too high a temperature or exposed to long-term storage. Continuous application of heat can be suppressed, and deterioration of the laminate forming the bottom member and deterioration of the quality of the contents can be suppressed. Further, the self-supporting packaging bag of the present invention is formed of a laminate having a sealant layer having a melting point of 120° C. or higher. Therefore, the self-supporting packaging bag of the present invention has heat resistance that can withstand heating in a heater. Further, by appropriately selecting the composition and thickness of the resin used in the sealant layer, even better impact resistance that can withstand drops and the like can be obtained.

In addition, in the self-supporting packaging bag of the present invention, the position of the spout is not limited to the upper end seal portion. Moreover, the spout may not be provided. Furthermore, the self-supporting packaging bag of the present invention is not limited to one in which the plane part, side part, and bottom part are respectively formed of a plane member, a side part member, and a bottom part, and the plane part and the side part have a single rectangular shape. cylindrical parts, flat parts and bottom parts or side parts and bottom parts made of a single rectangular member, and all face parts made of a single piece of material. It may be.
The self-supporting packaging bag of the present invention is not limited to one having four lower end seal portions 24 extending downward from each side of the rectangular bottom portion 18. The self-supporting packaging bag of the present invention may be a self-supporting packaging bag (standing pouch) that is made up of a pair of plane parts and a bottom part, and stands on its own from two lower end seal parts. For example, the self-supporting packaging bag of the present invention may be the self-supporting packaging bag 10A illustrated in FIG.

The self-supporting packaging bag 10A consists of a pair of flat parts 14A, 14A and a bottom part 18A. The pair of plane parts 14A, 14A and the bottom part 18A are formed of the laminate.
In the self-supporting packaging bag 10A, two side end sealed portions 20A extending in the height direction are formed by heat sealing the side ends of the pair of flat portions 14A, 14A.

At the lower end of the self-supporting packaging bag 10A, a bottom part 18A which is folded in half into a V-shape is placed between the lower part of the pair of flat parts 14A, 14A with the folding line facing upward, and each part has an inverted V-shape. The lower end of the lower end and the lower end of each of the pair of plane parts 14A, 14A are heat-sealed to form two lower end sealed parts 24A. The lower end seal portion 24A in this embodiment has a boat-like shape, and is sealed at a lower widthwise central portion of the flat portion 14A and at both ends at a higher position. The bottom portion 18A is provided so as to close the lower open end of the body formed by the pair of flat portions 14A, 14A.
An upper end seal portion is formed at the upper end of the self-supporting packaging bag 10A by heat sealing the upper ends of a pair of flat portions 14A, 14A.

A bottom face part 18A is arranged at the lower end opening of the cylindrical body formed by the pair of flat parts 14A, 14A, and is closed with the lower end seal part 24A, thereby forming a self-supporting packaging bag 10A. Thereby, like the self-supporting packaging bag 10, contents can be stored in the self-supporting packaging bag 10A.

Also in the free-standing packaging bag 10A, in the free-standing state, the two lower end seal parts 24A serve as legs and the bottom part 18A does not come into direct contact with the plane on which the free-standing packaging bag 10A is placed. It is possible to suppress excessively high temperature heat or continuous application of heat for a long time only to nearby contents, and it is possible to suppress deterioration of the laminate forming the bottom member and deterioration of the quality of the contents. Moreover, the self-supporting packaging bag 10A is formed of a laminate having a sealant layer having a melting point of 120° C. or higher, thereby providing heat resistance that can withstand heating in a heater. In addition, by appropriately selecting the composition and thickness of the resin used in the sealant layer, excellent impact resistance that can suppress bag breakage can be obtained.

The lower end sealed portion 24A of the self-supporting packaging bag 10A is boat-shaped, and the bottom surface portion 18A is raised at both ends, so that the bottom surface portion 18A that expands in the free-standing state is relative to the plane on which the self-supporting packaging bag 10A is placed. It does not spread in parallel directions. Therefore, there is a possibility that the way heat is transmitted from the warmer to the bottom part 18A differs between the higher ends of the bottom part 18A and the lower central part. On the other hand, in the self-supporting packaging bag 10, the expanded bottom portion 18 expands in a direction substantially parallel to the plane on which the self-supporting packaging bag 10 is placed, so that heat is transferred from the warmer to the bottom portion 18. The way it is communicated is fixed. For these reasons, in the present invention, an embodiment including four lower end seal parts 24 like the self-supporting packaging bag 10 is better than an embodiment including two lower end seal parts 24A like the self-supporting packaging bag 10A. preferable.

In addition, if a free-standing packaging bag falls over on a warmer for a long time, a wide area of the flat part will come into direct contact with the warmer, and the height will be too high for the laminate on the flat part or the contents near the flat part. There is a risk of deterioration due to high temperatures or continued exposure to heat for a long time. The self-supporting packaging bag 10, in which the bottom part 18 is rectangular and the four lower end seals 24 serve as legs, has better self-reliance than the self-supporting packaging bag 10A, in which the two lower end seals 24A serve as the legs. This is advantageous in that it is easy to suppress deterioration of the laminate and deterioration of the quality of the contents due to heating after falling.

When the self-supporting packaging bag of the present invention has a side end seal part like the self-supporting packaging bag 10 or the self-supporting packaging bag 10A, the side end seal part may be folded back and adhered to the flat surface or side surface. .

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited by the following description.
[Abbreviation]
The following abbreviations have the following meanings.
PET: Biaxially oriented polyethylene terephthalate film AL: Aluminum foil ONY: Biaxially oriented polyamide film

[Example 1]
Using a three-layer sealant film (total thickness: 80 μm, lowest melting point: 123.7°C) having the composition shown in Table 1 (inner layer, intermediate layer, and outer layer), and using a dry laminating adhesive between each film, a thickness of 12 μm was prepared. A laminate in which PET (7 μm thick), AL (7 μm thick), ONY (15 μm thick) and a sealant film were laminated in this order was obtained by dry lamination. A polyurethane two-component curing adhesive was used as the adhesive for dry lamination at this time. The melting point is the melting peak temperature measured in accordance with JIS K 7121 by cutting out the sealant film and heating it at a rate of 10° C. per minute by differential scanning calorimetry (DSC) in a nitrogen atmosphere.
The laminate is used as a member forming a pair of plane parts, a pair of side parts, and a bottom part, and in the same manner as the free-standing packaging bag 1 with a spout illustrated in FIGS. 1 to 3, the periphery of the rectangular bottom part is A free-standing packaging bag with a spout having four lower end seals extending downward from the spout was manufactured. The heat sealing temperature during formation of the lower end seal portion was 230°C. The width of the lower end seal portion was 5 mm.

[Example 2]
A laminate was obtained in the same manner as in Example 1, except that a three-layer sealant film (total thickness 80 μm, lowest melting point: 135°C) having the composition shown in Table 2 and having an inner layer, an intermediate layer, and an outer layer was used as the sealant film. A self-supporting packaging bag with a spout was manufactured.

[Example 3]
A laminate was obtained in the same manner as in Example 1, except that the thickness ratio of each layer of the sealant film was 70 μm without changing, and a self-supporting packaging bag with a spout was produced.

[Example 4]
A laminate was obtained in the same manner as in Example 1, except that the thickness ratio of each layer of the sealant film was changed to 65 μm without changing, and a self-supporting packaging bag with a spout was produced.

[Comparative example 1]
A spouted gusset bag 100 illustrated in FIGS. 10 and 11 was produced. The gusseted bag 100 with a spout includes a gusseted bag 110, a spout 112 liquid-tightly attached to the gusseted bag 110, and a cap 113 attached to the spout 112. The gusset bag 110 includes a pair of opposing flat parts 114, 114, and a pair of opposing side parts 116, 116 which are provided so as to connect the side ends of the flat parts 114, 114 and are folded inward. We are prepared. The gusset bag 110 has four side edge seal parts 120 in which the side edges of the adjacent plane part 114 and side part 116 are heat-sealed, and an upper edge seal part in which the upper ends of the plane part 114 and the side part 116 are heat-sealed. 122, and a lower end seal part 124 in which the lower ends of the flat part 114 and the side part 116 are heat-sealed. In the self-standing state of the spouted gusset bag 100, as shown in FIG. 11, the bottom surface including the lower end seal portion 124 formed by bending the flat portions 114, 114 serves as a mounting surface.

The same laminate as in Example 1 was used as the member forming the pair of plane parts 114, 114 and the pair of side parts 116, 116. The heat sealing temperature during formation of the lower end seal portion 124 was 230°C. The width of the lower end seal portion 124 was 5 mm.

[Comparative example 2]
A laminate was obtained in the same manner as in Example 1, except that an LLDPE film (thickness: 80 μm, melting point: 110° C.) was used as the sealant film, and a self-supporting packaging bag was produced.

[evaluation]
The packaging bags of each example were filled with 180 mL of water as contents, and the packaging bags were allowed to stand on their own in an oven at 100°C and heated for 24 hours.
(exterior)
The appearance of the packaging bag after heating was confirmed.
(Impact strength)
The packaged bag after heating was dropped from a height of 1.5 m to check whether the bag was torn or not. In each example, 10 packaging bags were tested, and the number of bags that were torn was counted.
The results are shown in Table 3.

As shown in Table 3, the self-supporting packaging bags of Examples 1 to 3 have good self-supporting properties and appearance after heating, and are excellent in heat resistance, and do not break even when dropped. It also had excellent impact resistance. The self-supporting packaging bag of Example 4 had good self-supporting properties and appearance after heating, and had excellent heat resistance. In addition, there were a few bags that broke when dropped, and although their impact resistance was inferior to Examples 1 to 3, they had sufficient impact resistance. The location where the bag broke in the free-standing packaging bag of Example 4 was on the fold line of the side surface that intersected with the inner end of the upper end seal.
On the other hand, the gusset bag of Comparative Example 1, which does not have the lower end seal part that serves as the legs, was continuously exposed to heat due to heating, so the sealant film deteriorated and delamination occurred at the bottom after heating. It was inferior in gender. In addition, many bags were broken due to dropping, and the impact resistance was poor. The location where the bag broke was on the fold line of the side surface that intersected with the inner end of the top end seal. The laminate used in Comparative Example 1 was the same as Example 1, but the bottom of the gusset bag in Comparative Example 1 continued to receive heat and the sealant film of the laminate deteriorated. This is thought to be due to the fact that the sealant film has also deteriorated to some extent. In addition, in the free-standing packaging bag of Comparative Example 2, in which the synthetic resin forming the sealant film had a melting point of less than 120°C, the four lower end seals that form the legs broke and fell over after heating due to the softening of the sealant film. When the product fell over, delamination occurred on the flat surface that would come into direct contact with the warmer, resulting in poor heat resistance. In addition, all of the tested self-supporting packaging bags of Comparative Example 2 were torn on the fold line of the side surface that intersects with the inner end of the upper end seal, and the impact resistance was poor.

1... Self-supporting packaging bag with spout, 10, 10A... Self-supporting packaging bag, 12... Spout, 13... Cap, 14, 14A... Flat part, 16... Side part, 18, 18A... Bottom part, 20, 20A... Side End seal portion, 22... Upper end seal portion, 24, 24A... Lower end seal portion, 26... Lateral gusset portion, 200... Plane.

Claims (4)

A self-supporting packaging bag for hot food and beverage products formed of a laminate having a sealant layer and having a bottom portion, the bag comprising:
Comprising a pair of flat parts, a pair of side parts, and a bottom part,
The pair of side parts are each folded inward, and have a side end seal part that connects the side ends of the flat part and the side part,
The bottom portion has a lower end seal portion that closes a lower open end of a cylindrical body formed by the pair of plane portions and the pair of side portions,
A point seal is provided in a portion of the lower end seal portion of the side surface portion corresponding to the fold line of the side surface portion, and a portion that overlaps when the self-supporting packaging bag is folded in the lower end seal portion of the flat surface portion. done,
In a freestanding state, the lower end seal portion serves as a foot, and the bottom portion is spaced apart from a surface on which the freestanding packaging bag is placed;
A self-supporting packaging bag, wherein the sealant layer has a melting point of 120°C or higher. A self-supporting packaging bag with a spout, the self-supporting packaging bag according to claim 1 having a spout attached thereto. A self-contained packaging bag containing contents, the self-supporting packaging bag according to claim 1 containing the contents. A self-standing packaging bag with a spout containing contents, wherein the contents are stored in the self-standing packaging bag with a spout according to claim 2 .

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