JP7543664B2 - Tube container - Google Patents

Description

The present invention relates to a tube container.

Tube containers made of resin-based materials are widely used as packaging materials for medicines, cosmetics, food, etc. For example, Patent Document 1 describes a tube container that is composed of a pouring unit that extracts the contents and a body that is welded to the pouring unit and contains the contents.

JP 2016-199280 A

In recent years, there has been a demand to reduce the amount of resin used in packaging containers from the perspective of reducing the environmental burden and protecting resources. Therefore, in order to reduce the amount of resin in a resin tube container such as that described in Patent Document 1, for example, it is possible to make the film that constitutes the body thinner.

However, simply making the film that makes up the body thinner weakens the body and reduces the container's ability to stand up on its own.

Therefore, the present invention aims to provide a tube container that uses less resin than conventional containers and has the stiffness necessary for the container to stand on its own.

The tube container according to the present invention comprises a tubular body portion made of a sheet having paper and a sealant and one end of which is closed, and a pouring outlet portion made of a material containing a thermoplastic resin and paper powder as a filler and attached to the other end of the body portion, the basis weight of the paper being 30 to 200 g/ ^m2 , the mass ratio of the paper being the highest among the total mass of the materials constituting the body portion and the pouring outlet portion, and the mass ratio of the paper powder being 51% or more among the total mass of the materials constituting the pouring outlet portion, the pouring outlet portion comprising a cylindrical pouring tube portion and a flat flange portion connected to one end of the pouring tube portion and extending outside the pouring tube portion and in a direction perpendicular to the axial direction of the pouring tube portion, annular convex portions and concave portions are provided on the outer surface of the flange portion, the height of the convex portion being 0.05 to 2 mm, and the depth of the concave portion being 2 mm or less, and the inner surface near the other end of the body portion being joined to the surface of the flange portion on the other end side .

The present invention reduces the amount of resin used compared to conventional methods, and provides a tube container that has the stiffness necessary for the container to stand on its own.

FIG. 1 is a front view showing a schematic configuration of a tube container according to an embodiment. FIG. 2 is a perspective view of the spout portion shown in FIG. FIG. 3 is an end view taken along line III-III shown in FIG. FIG. 1 is a cross-sectional view showing an example of a sheet constituting a body portion of a tube container.

Figure 1 is a front view showing the schematic configuration of a tube container according to an embodiment, Figure 2 is a perspective view of the spout shown in Figure 1, and Figure 3 is an end view along line III-III shown in Figure 1. Figures 2 and 3 show the state before the body is sealed to the spout.

The tube container 100 comprises a tube-shaped body 1 and a spout 2 attached to the body 1.

The body 1 is a member for containing contents, and is formed by forming a sheet having a pair of approximately parallel edges into a cylindrical shape. The body 1 is formed into a cylindrical shape, for example, by butting the inner surfaces of the band-shaped parts including each of the pair of edges of the sheet together in a palm-to-palm shape and welding them together. One end 5a (lower end in FIG. 1) of the body 1 is sealed and closed. On the other hand, the vicinity of the other end 5b (upper end in FIG. 1) of the body 1 is sealed to the outer surface 8 of the flange part 4 described later in a folded state. At the welded part between the body 1 and the flange part 4, a plurality of pleats 12 are formed by folding the sheet constituting the body 1. The bonding part 7 (back bonding part) formed in the body 1 by bonding the edge parts of the film may be folded so as to follow the outer surface of the body 1 and bonded to the body 1. The method of attaching the bonding portion 7 to the body 1 is not particularly limited, and the two may be welded together via a heat-sealable resin provided on the entire or partial surface of the film constituting the body 1, or may be bonded together via an adhesive such as a hot melt. Note that the bonding method of the body 1 shown in FIG. 1 is an example, and the outer surface of a band-shaped region including one edge of the film constituting the body 1 may be bonded to the inner surface of a band-shaped region including the other edge of the film.

Figure 4 is a cross-sectional view showing an example of a sheet that constitutes the body of a tube container.

The body 1 of the tube container 100 is composed of a sheet 41 mainly made of paper. The sheet 41 is a multi-layer sheet in which a base film layer 33, a barrier layer 34, and a sealant layer 35 are laminated in this order on one side of a paper layer 32, a paper protective layer 37 is laminated on the other side of the paper layer 32, and an ink layer 38 and an overcoat varnish layer 39 are further laminated on the paper protective layer 37. Each layer will be described in detail below.

(Paper layer)
The paper layer 32 is a structural layer that imparts strength and stiffness to the tube container 100. The type of paper constituting the paper layer 32 is not particularly limited, but it is preferable to use one-sided gloss kraft paper or double-gloss kraft paper in terms of strength, bending resistance, and printability. Furthermore, waterproof paper or greaseproof paper may be used as the paper constituting the paper layer 32, if necessary.

The basis weight of the paper used in the paper layer 32 is 30 to 200 g/ ^m2 , and preferably 50 to 120 g/ ^m2 . If the basis weight of the paper used in the paper layer 32 is less than 30 g/ ^m2 , the stiffness of the body 1 is insufficient. In order to compensate for the stiffness, for example, it is necessary to thicken the resin film provided inside the paper layer 32, but this leads to an increase in the resin ratio, which is undesirable in terms of reducing the environmental load. In addition, if the basis weight of the paper used in the paper layer 32 exceeds 200 g/ ^m2 , the stiffness and heat insulating properties of the paper deteriorate the tube-making (bag-making), moldability, and welding properties, and the manufacturing cost also increases, which is undesirable.

(Base Film Layer)
The base film layer 33 is a layer that imparts heat resistance and physical strength such as toughness to the sheets 31 and 32. The base film layer 33 also serves as a base material for the barrier layer 34. The material of the film that constitutes the base film layer 33 is not particularly limited, but from the viewpoint of heat resistance and physical strength, it is preferable to use a stretched film of polypropylene, polyester, polyamide, or the like. However, the base film layer 33 may be made of paper.

(Barrier Layer)
The barrier layer 34 is a functional layer that blocks oxygen, water vapor, and the like, and improves the preservation of the contents. The barrier layer 34 can be composed of at least one of a vapor deposition film of an inorganic compound such as silica or alumina, a vapor deposition film of a metal such as aluminum, a metal foil such as aluminum, a plate-like mineral, and/or a coating film of a barrier coating agent containing a barrier resin. As the barrier resin used in the barrier coating agent, ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride (PVDC), and the like can be used, and a binder resin other than the barrier resin is appropriately blended in the barrier coating agent. The barrier layer 34 may be laminated on the base film layer 33 in advance to form a barrier film, or may be provided as a single layer film.

(Sealant Layer)
The material of the sealant layer 35 is not particularly limited, but is preferably a thermoplastic resin such as polypropylene, polyethylene, cyclic polyolefin, polyester, etc. The sealant layer 35 uses a resin whose softening temperature is 20° C. or more lower than the softening temperature of the base film layer 33. If the softening temperature of the sealant layer 35 is not 20° C. or more lower than the softening temperature of the base film layer 33, the base film layer 33 may soften during sealing, which is not preferable, as this increases the possibility of pinholes occurring. The softening temperature of the sealant layer 35 is preferably 40° C. or more lower than the softening temperature of the base film layer 33.

The thermoplastic resin used for the sealant layer 35 may be any resin that has adhesive properties with respect to the thermoplastic resin constituting the material of the outlet portion 2 described below, but it is preferable that the thermoplastic resin used for the outlet portion 2 is the same material. By using the same thermoplastic resin for the sealant layer 35 as the thermoplastic resin layer used for the outlet portion 2, the seal strength between the body portion 1 and the outlet portion 2 can be improved.

(Paper protective layer)
The paper protective layer 37 is a layer for protecting the paper layer 32 constituting the sheet 41 from adhesion of contents and dirt. The material and method of forming the paper protective layer 37 are not particularly limited, but the paper protective layer 37 can be laminated by extrusion coating of a thermoplastic resin or coating with a coating agent such as a water-resistant agent or an oil-resistant agent. The thickness of the paper protective layer 37 is preferably 0.2 to 50 μm, and more preferably 1 to 20 μm. If the thickness of the paper protective layer 37 is less than 0.2 μm, pinholes may occur in the paper protective layer 37, and the protection of the paper layer 32 may be insufficient. In addition, if the thickness of the paper protective layer 37 exceeds 50 μm, it is not preferable in terms of the amount of resin used and manufacturing costs.

(Ink layer, overcoat varnish layer)
The ink layer 38 is a layer applied by printing to provide various indications, and the overcoat varnish layer 39 is a layer for imparting abrasion resistance, etc. The order of lamination of the ink layer 38 and the overcoat varnish layer may be reversed to that shown in Figure 4. Moreover, the overcoat varnish layer 39 may also serve as the paper protective layer 37.

The thickness (total thickness) of the sheet 41 that constitutes the body 1 is not particularly limited, but is preferably 30 to 300 μm. If the thickness of the film that constitutes the body 1 is within this range, the body 1 can be easily processed into a cylindrical shape using a bag making machine or pillow stick packaging machine. In addition, since the paper layer 32 provides strength and stiffness, it can be made thinner than a typical laminate tube (thickness 300 to 500 μm), and the amount of resin used can also be reduced.

To reduce the resin ratio of the sheet 41 that constitutes the body 1, it is preferable that the paper layer 32 accounts for 50% or more of the mass of the sheet 41. From the perspective of reducing the amount of resin used, the higher the ratio of the paper layer 32, the better.

The sheet constituting the body 1 only needs to have the sealant layer 35 laminated on at least one side of the paper layer 32 (the side that faces the inside of the tube container 100), and one or more of the above-mentioned base film layer 33, barrier layer 34, paper protection layer 37, ink layer 38, and overcoat varnish layer 39 may be omitted.

Referring again to Figs. 1 to 3, the spout 2 is a spout for extracting the contents contained in the body 1 to the outside, and includes a cylindrical spout tube 3 and a flange 4. The flange 4 is connected to one end 6a (the lower end in Fig. 1) of the spout tube 3, and is a flat plate-like portion extending outward from the spout tube 3. In this embodiment, the flange 4 is formed so as to extend in a direction perpendicular to the axial direction of the spout tube 3 (the left-right direction in Fig. 1). In this embodiment, the flange 4 is formed in an annular shape, but as long as the body 1 can be joined, the shape of the flange 4 is not limited, and may be an ellipse, an oval, a track, a polygon, or the like.

The outlet 2 is molded from a material containing a thermoplastic resin and a filler other than resin. The thermoplastic resin used for the material of the outlet 2 can be, for example, any one of polyethylene, polypropylene, polyester, polyamide, and cyclopolyolefin, or a combination of two or more of them. The filler can be any one of talc, kaolin, paper powder, and cellulose fiber, or a combination of two or more of them. By using a mixture of a thermoplastic resin and a filler other than resin as the material of the outlet 2, it is possible to reduce the amount of resin used while maintaining moldability and heat welding with the sheet material of the body 1. There are no particular limitations on the molding method for the outlet 2, but existing molding methods such as injection molding, thermoforming such as vacuum forming and hot plate compression molding, and compression molding can be used.

2 and 3, the outer surface 8 of the flange portion 4 (the surface on the end 6b side of the pouring tube portion 3) is provided with annular convex portions 9 and concave portions 10. When the body portion 1 is welded to the flange portion 4 of the pouring outlet portion 2, the convex portions 9 melt first, and the molten resin spreads between the inner surface of the body portion 1 and the flange portion 4. In addition, a part of the molten resin flows into the concave portions 10. As a result, the inner surface of the body portion 1 and the outer surface 8 of the flange portion 4 can be welded by surface through the molten resin of the convex portions 9, and the weld strength can be improved. The pouring outlet portion 2 according to this embodiment contains a filler other than resin, and the weld strength between the body portion 1 and the pouring outlet portion 2 is likely to decrease, but the necessary weld strength can be ensured by providing the convex portions 9 and concave portions 10. The number of the convex portions 9 and the concave portions 10 is not particularly limited, and may be two or more. In addition, the number of the convex portions 9 and the concave portions 10 does not have to be the same number, and for example, two concave portions 10 may be provided on the inside and outside of one convex portion 9. Also, the recess 10 does not need to be provided.

The height of the protrusions 9 (height from the outer surface 8 of the flange portion 4) is 0.05 to 2 mm, and preferably 0.1 to 1 mm. If the height of the protrusions 9 is less than 0.05 mm, the effect of improving the welding strength is not obtained. On the other hand, if the height of the protrusions 9 exceeds 2 mm, the protrusions 9 do not melt completely when the body portion 1 is welded, and remain as a step on the outer surface 8 of the flange portion 4, which can cause the contents to leak.

The depth of the recess 10 (depth from the outer surface 8 of the flange portion 4) is 0 to 2 mm, and preferably 0 to 1 mm. If the protrusion 9 is low, the recess 10 may not be necessary. Also, if the depth of the recess 10 exceeds 2 mm, it is not preferable because it reduces the strength of the flange portion 4 and deteriorates the appearance after the body portion 1 is welded.

Methods for welding the body 1 and the spout 2 when manufacturing the tube container 100 include ultrasonic welding, high-frequency welding, heat seal welding, hot air welding, and compression molding of the body insert. However, ultrasonic welding is preferred because it is less affected by the insulating properties of the paper.

When the tube length of the tube container 100 is L and the tube diameter is D, it is preferable that L/D is in the range of 1 to 10, and more preferably in the range of 1.5 to 8. Here, as shown in FIG. 1, the tube length L is the axial length from the welding point to the flange portion 4 to the end 5a, and the tube diameter D is the diameter of the flange portion 4 when the flange portion 4 is circular, and is (A+B)/2 when the flange portion 4 is elliptical (where A is the major axis of the ellipse, and B is the minor axis of the ellipse). When the value of L/D is less than 1, the tube length L is too short compared to the tube diameter D, and the shape of the tube container 100 is not suitable for a packaging container. On the other hand, when the value of L/D is more than 10, the tube length L is too long compared to the tube diameter D, so that the appearance of the tube container 100 is poor and the shape of the tube container 100 is not suitable for a packaging container.

1, the tube container 100 may further include a screw cap 11 that can be attached and detached by screwing onto the pouring tube portion 3 of the pouring outlet portion 2. When the tube container 100 includes the screw cap 11, it becomes easy to reseal the tube container 100 after it has been opened.

The tube container 100 may also be provided with a hinge cap instead of the screw cap 11. When a hinge cap is provided, the hinge cap may be attached to the spout 2 by screwing it into the tubular pouring portion 3 shown in FIG. 1. Alternatively, a rib may be provided on the outer surface of the tubular pouring portion 3 instead of a screw thread, and the hinge cap may be attached to the spout 2 by fitting through the rib.

The end 6b of the dispensing tube portion 3 may be sealed with a film that closes the dispensing tube portion 3 when the tube container 100 is in an unopened state.

Furthermore, the inside of the dispensing tube part 3 may be closed by a partition to keep the inside of the tube container 100 sealed when the tube container 100 is unopened. When providing a partition, it is preferable to provide a circular half cut along the inner circumference of the dispensing tube part 3 and to provide a pull ring connected to the part surrounded by the half cut. With this configuration, when opening the tube container 100, the user can pull the pull ring to break the part of the partition at the half cut 27, thereby removing the part of the partition surrounded by the half cut and forming an opening for dispensing the contents from the body part 1 to the dispensing tube part 3.

As described above, in this embodiment, the body 1 is made of a sheet having paper and a sealant, and the spout 2 is molded from a material containing a thermoplastic resin and a filler other than resin, and the mass ratio of paper is the highest among the total masses of the materials constituting the body 1 and the spout 2. In a conventional resin tube container, if the resin layer of the sheet constituting the body is simply thinned, the body will lack stiffness, and the self-supporting and handleability of the tube container will decrease. In contrast, in this embodiment, by using paper as the structural material of the body 1, it is possible to impart stiffness to the body 1 while reducing the amount of resin used. In addition, the amount of resin used in the tube container 100 can be reduced by blending a filler other than resin into the molding material of the spout 2. Therefore, according to this embodiment, it is possible to realize a tube container 100 that uses less resin than the conventional one and has the stiffness necessary for the self-supporting and handleability of the container. In addition, since the basis weight of the paper used for the body 1 is 200 g/ ^m2 or less, the rolling process when forming the body 1, the welding of the bonding portion 7, the folding near the end 5b of the body 1 when attaching the body 1 to the spout portion 2, and the welding to the flange portion 4 near the end 5b of the body 1 can be performed without problems, and the formability by processing equipment is good.

In addition, in the tube container 100 according to this embodiment, the flange portion 4 has a flat plate shape perpendicular to the central axis of the pouring tube portion 3, and the body portion 1 is welded to the outer surface 8 of the flange portion 4, so when the contents of the tube container 100 become low, the body portion 1 can be easily squeezed out by folding it along the outer periphery of the flange portion 4. In addition, since the flange portion 4 has a flat plate shape and does not form a space in which the contents remain, the body portion 1 can be folded along the outer periphery of the flange portion 4 to make the flange portion 4 and the body portion 1 in a substantially flat state, so that all of the contents can be squeezed out.

The following describes specific examples of the present invention.

Example 1
A sheet for forming the body was prepared by bonding a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd., product ^name : GL-RD) and a 50 μm thick unstretched polypropylene film (manufactured by Futamura Chemical Co., Ltd., product name: FHK2) in this order onto unbleached kraft paper (manufactured by Oji Paper Co., Ltd.) with a basis weight of 100 g/m2 by dry lamination using a two-component curing urethane adhesive. The prepared sheet was processed using a back-sealing bag making machine to prepare a cylindrical back-sealed pouch (body) with a diameter of 35 mm and a length of 200 mm.

The spout was made by injection molding a molding material (Product name: MAPKA, Eco Management Research Institute, Inc.) made of a blend of 49% by mass of polypropylene and 51% by mass of paper powder. The volume of the spout was 1.35 ml. In addition, a convex portion 0.5 mm high and a concave portion 0.3 mm deep adjacent to the outer side of the convex portion were formed concentrically with the spout tube.

The body and spout were then heat-sealed using a special processing device to create a tube container with a diameter of 35 mm.

Example 2
A tube container having a diameter of 35 mm was produced in the same manner as in Example 1, except that no convex or concave portion was formed on the outer surface of the flange portion of the spout portion.

Example 3
A 35 mm diameter tube container was produced in the same manner as in Example ¹ , except that a sheet for forming the body was produced by bonding a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd., product name: GL-RD), a 15 μm thick stretched nylon film (manufactured by Unitika Ltd., product name: ONBC), and a 50 μm thick unstretched polypropylene film (manufactured by Futamura Chemical Co., Ltd., product name: FHK2) in this order by dry lamination using a two-component curing urethane adhesive on unbleached kraft paper (manufactured by Oji Paper Co., Ltd.) with a basis weight of 120 g/m2.

Example 4
A tube container having a diameter of 35 mm was produced in the same manner as in Example 1, except that unbleached kraft paper having a basis weight of 120 g/ ^m2 (manufactured by Oji Paper Co., Ltd.) was used.

Example 5
A tube container having a diameter of 35 mm was produced in the same manner as in Example ¹ , except that a sheet for forming the body was produced using unbleached kraft paper (manufactured by Oji Paper Co., Ltd.) having a basis weight of 120 g/m2, and a molding material in which 70% by mass of polypropylene and 30% by mass of calcium carbonate was blended was injection molded to produce the spout portion.

(Example 6)
A tube container having a diameter of 35 mm was produced in the same manner as in Example 1, except that a sheet for forming the body was produced using unbleached kraft paper having a basis weight of 180 g/ ^m2 (manufactured by Oji Paper Co., Ltd.).

(Comparative Example 1)
A 12 μm-thick transparent barrier film (manufactured by Toppan Printing Co., Ltd., product name: GL-RD), a 15 μm-thick stretched nylon film (manufactured by Unitika Ltd., product name: ONBC), and a 100 μm-thick unstretched polypropylene film (manufactured by Futamura Chemical Co., Ltd., product name: FHK2) were bonded together in this order by dry lamination using a two-component curing urethane adhesive to produce a sheet for forming the body. The produced sheet was processed using a back-sealing bag-making machine to produce a cylindrical back-sealed pouch (body) with a diameter of 35 mm and a length of 200 mm.

The spout was made by injection molding polypropylene (100% by mass). The volume of the spout was 1.35 ml. In addition, a convex portion with a height of 0.5 mm and a concave portion with a depth of 0.3 mm adjacent to the outer side of the convex portion were formed concentrically with the spout tube.

The body and spout were then heat-sealed using a special processing device to create a tube container with a diameter of 35 mm.

(Comparative Example 2)
A tube container having a diameter of 35 mm was produced in the same manner as in Example 1, except that a sheet for forming the body was produced using unbleached kraft paper having a basis weight of 250 g/ ^m2 (manufactured by Oji Paper Co., Ltd.).

(Comparative Example 3)
A 60 μm thick polyethylene film, a 12 μm thick polyethylene terephthalate film, a 160 μm thick polyethylene film, a 12 μm thick transparent barrier film (manufactured by Toppan Printing Co., Ltd., product name: GL-RD), and a 100 μm thick polyethylene film were laminated in this order by dry lamination using a two-liquid curing urethane adhesive to prepare a sheet for forming the body. The prepared sheet was processed with a tubing machine for laminated tubes to prepare a tube container with a diameter of 35 mm. A spout portion (shoulder portion) was molded from high-density polyethylene by compression molding, and the prepared tube was welded to the spout portion at the same time to prepare a tube container with a diameter of 35 mm.

(Comparative Example 4)
A 12 μm-thick transparent barrier film (manufactured by Toppan Printing Co., Ltd., product name: GL-RD), a 15 μm-thick stretched nylon film (manufactured by Unitika Ltd., product name: ONBC), and a 60 μm-thick linear low melting point polyethylene (LLDPE, manufactured by Tamapoly Chemical Co., Ltd., product name: SE625A) were bonded together in this order by dry lamination using a two-component curing urethane adhesive to produce a film. The produced film and a spout produced by injection molding of high-density polyethylene were processed in a bag-making machine equipped with a spout welding machine to produce a gusset-type pouch with a spout.

The configuration of the containers according to each of the Examples and Comparative Examples is shown in Table 1. The numerical values shown in the column for the configuration of the body in Table 1 indicate the basis weight (g/m ² ) of the paper or the thickness (μm) of the resin layer.

Table 2 also shows the material composition of the containers for each example and comparative example, the mass of resin used per container, the thickness of the body, the amount of resin used, moldability, the independence of the body, and the overall evaluation.

The amount of resin used, moldability, self-supporting ability of the body, and overall evaluation in Table 2 were evaluated according to the following criteria. Note that the containers of Comparative Examples 3 and 4 were not evaluated for moldability because they had different shapes from the containers of Examples 1 to 6.
<Amount of resin used>
○: The mass ratio of paper to the mass of the container is the highest. ×: The mass ratio of paper to the mass of the container is not the highest. <Moldability>
◎: The body part could be processed and welded to the spout by the back-pasting bag making machine without any problems, and moldability was good. ○: The body part could be processed and welded to the spout by the back-pasting bag making machine without any problems, and moldability was good, but productivity was slightly inferior to the "◎" case due to poor tact time, etc. ×: The body part could not be processed and welded to the spout by the back-pasting bag making machine, or scorching occurred at the welded area, and moldability was problematic. <Self-supporting ability>
○: When the empty container was placed with the pouring tube part facing down, the body part remained without breaking. ×: It was not possible to stand on its own. <Overall evaluation>
○: Resin usage, moldability and self-supporting property are all good (◎ or ○)
×: Either the amount of resin used, moldability, or self-supporting property is poor (×)

As shown in Table 2, in all of the tube containers according to Examples 1 to 6, the mass ratio of paper in the entire container was the highest, and the amount of resin used was reduced. However, since the sheet constituting the body contained paper with a basis weight of 30 to 200 g/ ^m2 , the body was stiff and could stand on its own even when the content was reduced, and there were no problems with formability using the processing equipment.

In addition, in the tube containers of Examples 1 and 3 to 6, in which a convex portion and a concave portion were provided on the flange portion of the spout portion, the body portion was strongly welded to the flange portion, mainly around the points where the convex portion and the concave portion were provided, and the seal strength between the two was superior, compared to Comparative Example 2, in which no convex portion and concave portion were provided.

In contrast, the tube container of Comparative Example 1 does not have sufficient stiffness because the sheet constituting the body is made of a resin film, and the body cannot stand on its own even when the contents have decreased. In addition, because both the body and the spout are made of resin, it is not suitable for reducing the amount of resin used.

The tube container of Comparative Example 2 was unable to be welded to the back of the body or to the spout because the paper contained in the sheet that made up the body was too thick. The tube container of Comparative Example 2 was unable to be molded, so its self-supporting ability could not be evaluated.

The laminated tube of Comparative Example 3 has a large thickness of the resin laminate sheet that constitutes the body, so the body can stand on its own even when the contents are reduced, but it uses a large amount of resin and is not suitable for reducing the amount of resin used.

The spouted pouch of Comparative Example 4 was not able to stand on its own even with the contents reduced because the sheet constituting the body was made of a resin film, which did not provide sufficient stiffness, and the container shape was not suitable for standing on its own. In addition, both the body and the spout were made of resin, which made it unsuitable for reducing the amount of resin used.

The tube container of the present invention can be used as a packaging material for medicines, cosmetics, food, etc.

Reference Signs List 1 Body portion 2 Spout outlet portion 3 Spout tube portion 4 Flange portions 5a, 5b End portions 6a, 6b End portions 32 Paper layer 35 Sealant layer 41 Sheet

Claims (4)

A tubular body portion made of a sheet having paper and a sealant, one end of which is closed;
The container is made of a material containing a thermoplastic resin and paper powder as a filler, and has a spout attached to the other end of the body.
The paper has a basis weight of 30 to 200 g/ ^m2 ,
The mass ratio of paper is the highest among the total mass of the materials constituting the body and the spout portion, and the ratio of paper powder among the total mass of the materials constituting the spout portion is 51% or more;
The pouring outlet portion is
A cylindrical pouring tube portion;
a flat flange portion connected to one end of the pouring tube portion and extending outward from the pouring tube portion and in a direction perpendicular to the axial direction of the pouring tube portion;
An outer surface of the flange portion is provided with an annular convex portion and a concave portion,
The height of the protrusion is 0.05 to 2 mm,
The depth of the recess is 2 mm or less,
a tube container , wherein an inner surface of the body portion near the other end thereof is joined to one of the two surfaces of the flange portion on the other end side of the cylindrical pouring portion . The tube container according to claim 1, wherein the thermoplastic resin constituting the pouring outlet is at least one selected from polyethylene, polypropylene, polyester, polyamide, and cyclopolyolefin. The tube container according to claim 1 or 2, wherein the thermoplastic resin constituting the spout portion and the sealant of the sheet constituting the body portion are made of the same material. The pouring outlet portion is
A cylindrical pouring tube portion;
a flat flange portion connected to one end of the pouring tube portion and extending outward from the pouring tube portion and in a direction perpendicular to the axial direction of the pouring tube portion;
4. The tube container according to claim 1, wherein an inner surface of the body portion near the other end is joined to one of both surfaces of the flange portion on the other end side of the cylindrical pouring portion.

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