JPH01294446A - Sealed packaging bag - Google Patents

Abstract

PURPOSE:To make an assured opening along a predetermined opening line possible, by constituting a bag with a basic material of a composite film, for which a film with a large tear strength and an elongated film are laminated, and putting a cut line in a perforation state. CONSTITUTION:A sheet 2 has a basic material of a composite film 6, for which on the surface of a printing layer side 4 of an elongated film 3, a non-elongated synthetic resin film 5 with a comparatively large tear strength has been laminated. On the composite film 6, at prescribed positions, such as a most suitable position for opening etc., which corresponds with the printing layer 4, a cut line 7 in a perforation state has been formed. On the one surface of the composite film 6, mainly on the surface of the synthetic resin film 5, a sealing resin layer 8 with a good adhesive property, such as olefin resin and others, is laminated, and on the other surface, a coating of resin with a favorable gas barrier property is applied to make the sheet 2. On a resin coating layer 9 and the sealing resin layer 8, the cut line 7 in a perforation state is not formed. At the predetermined line, tear-opening can be done assuredly, and a content can be easily and securely taken out.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is mainly applicable to various liquid and fluid seasonings such as soy sauce, sauces, dressings, jams, mayonnaise, mustard paste, wasabi paste, and ramen oil. The small portions for storing such items are related to bags and other sealed packaging bags that need to be torn and opened according to set opening lines.

[Prior art and problems to be solved] Synthetic resin film is used as a packaging body for attaching amounts of various seasonings such as sauces and mayonnaise, for example, in school lunches, fast food restaurants, and various bento boxes. The amount of seasonings and the like to be used once is sealed in a packaging bag.

Conventionally, composites of synthetic resin films having relatively high film strength such as compressive strength have often been used as sealed packaging bags for liquid seasonings and the like to protect the contents. For example, the inner surface of the composite bag is made of linear low-density polyethylene (L-LDPE) film, which has excellent tear resistance, and the outer surface of the bag is made of nylon, polyvinyl alcohol, polyester, polypropylene resin, etc., which have strong mechanical strength. Stretched films are often used.

By the way, when opening these sealed bags to take out the contents, it is common to provide a notch in the seal portion and tear the bag from the notch, but this opening operation is not easy.

In other words, the notch is usually attached after sealing the packaged item in the filling machine, but the bag material becomes hot and sticky immediately after sealing, and the blade is not properly controlled.
The L-LDPE film often does not have sharp cuts or incisions, and the above-mentioned L-LDPE film has a strong tear strength and feels sticky, so when opening the film, even if there is a notch, it cannot be easily torn.

Furthermore, although the above-mentioned stretched film can be easily torn if there is a tear trigger such as a notch, it has a directionality that is slightly inclined with respect to the width direction due to the stretching means used at the manufacturing stage. Therefore, when tearing from the notch formed in the seal, depending on the direction in which you move your finger, the seal may be pulled off depending on the direction you move your finger due to the above-mentioned directionality, making it extremely difficult to tear. The stronger something is, the harder it is to tear it apart.

Therefore, when opening the bag, you end up applying more force than necessary to your fingertips, and if the force is not controlled, even if it breaks, the contents may blow out and scatter, or the front and back of the bag may be damaged. The direction or position of the break line may be distorted or separated, which may stain your fingertips, hands, clothes, or floor.

In particular, although the stretched film can be easily torn if there is a trigger to tear it, it is difficult to control the direction of tearing, that is, the direction in which it is opened when it is made into a bag. It is difficult to control the opening direction and open along the planned opening line.

In addition, as a means to control the opening direction, there are two methods: 1. Incorporating a thread into the line where the bag should be opened and pulling this thread to cut the film, 2. It is conceivable to take advantage of the directional properties of this film, or (2) to make an adhesive tape from a directional film and attach this adhesive tape to the opening line to control the opening direction.

However, in the cases of ■ and ■ above, the current small portions do not suit the shape of the packaging bag or the filling machine, and a new side thread is required, and in the case of ■, additional materials and processes are required, which increases the cost. Not only is the bag expensive, but it is also unnecessarily stiff, and when the bag is opened, the bag's stiffness pushes out particularly low-viscosity contents, making it easy for the contents to pop out, creating problems in its use.

In addition, even in the case of a bag in which a part of the storage part is formed to extend as a passage for taking out at the sealed part of the periphery using a deformed seal, and this passage is broken, the tear notch is also provided. Since it is only provided at the seal portion, it is not easy to open the seal by tearing it, and the break line becomes unstable, making it easy to cause the above-mentioned opening error.

In view of the above, the present invention provides that small portions of liquid foods such as liquid seasonings can be easily opened along the opening line set in advance by perforated cut lines in the form of bags or other sealed packaging bags. To provide a sealed packaging bag which can be opened quickly and reliably, and whose contents can be easily taken out from an opening without failure.

[Means for Solving the Problems] In order to solve the above problems, the present invention particularly provides L-L
Films with high tear strength, such as DPE films, are difficult to tear, but we focused on the fact that if perforated cuts are made in them, they can only be cut along the perforations, and we developed a composite film that is a laminate of this film and a stretched film. A bag is used as the base material, and perforations are cut into the bag to ensure that the bag can be opened along a predetermined opening line.

That is, the sealed packaging bag of the present invention is a sheet material based on a composite film made by laminating at least one layer of stretched synthetic resin film and a synthetic resin film with high tear strength. The bag body is made of a sheet material with perforations for tearing formed thereon and a resin layer for sealing on one side, and the perforations are used to cut a part of the storage area of the packaged object. It is characterized by being arranged transversely and sealed at the peripheral edge.

In the above, it is particularly preferable that the sheet material constituting the bag has a coating layer of polyvinylidene chloride resin on either the inside or outside of the bag.

[Function] According to the present invention having the above configuration, since the sheet material constituting the bag has perforation-like cut lines in the composite film of the base material, when taking out the contents, By pinching the side of the cut line and tearing it, the package can be easily torn along the cut line to open the package.

In other words, if a synthetic resin film with high tear strength among the composite films that is the base material of the sheet material is provided with perforation-like score lines, the tear resistance may cause the synthetic resin film to have a high tear strength. The stretched film laminated with this synthetic resin film has strong mechanical strength, but it is difficult to tear when the film is opened. Since the composite film is easily torn, the composite film can be reliably broken and opened along the perforation-like cut lines, that is, the planned opening lines. Therefore, a part of the set container can be opened cleanly, and the contents can be easily taken out.

Further, the perforation-like cut line is formed only in the composite film that is the base material in the sheet material, and the cut hole is blocked by at least the inner sealing resin layer, so that the cut line is Even though it is held in a closed state and has a perforated cut line, a predetermined sealing performance can be ensured.

In particular, when a coating layer of polyvinylidene chloride resin, which has excellent gas barrier properties, is provided on one side of the sheet material, this not only keeps the cut line completely closed, but also allows the perforation-like cut to be Despite having the following properties, excellent sealing properties and gas barrier properties can be ensured.

[Example] Next, embodiments of the present invention will be described based on the drawings.

In the embodiments of FIGS. 1 and 4, (A) is a bag;
(2) shows the sheet material constituting the front and back bodies (la, Ub) of the bag (A).

This sheet material (2), as shown enlarged in Fig. 2,
One side of a stretched film (3) of a synthetic resin such as a stretched polyvinyl alcohol resin film is printed as desired, and L-LD is applied to the printed layer (4) side of the stretched film (3).
The base material is a composite film (6) in which unstretched synthetic resin films (5) having relatively high tear strength, such as PE films, are laminated by dry lamination or other laminating means. Perforated cut lines (7) are formed in this composite film (6) at required locations such as optimal opening positions corresponding to the printed layer (4). Furthermore, one side of the composite film (6), mainly the synthetic resin film (5).
) is provided with a sealing resin layer (8) of polyethylene resin, olefin resin such as polypropylene resin, or other highly adhesive sealing resin layer (8) laminated by extrusion lamination method or dry lamination method, and the other surface is provided with a gas barrier layer (8). The sheet material (2) is coated with a highly durable polyvinylidene chloride resin.

(9) indicates the resin coating layer, and the perforation-like cut line (7) is not formed in this resin coating layer (9) and the sealing resin layer (8). Composite film (6) in particular formed with perforated score lines (7)
After sealing resin is laminated to the hole of the cut line (7) to close the hole, the part of the cut line (7) can be reliably coated with polyvinylidene chloride resin.

In each of the embodiments shown in FIG. 1 and FIG. 4, the sheet material (2) is used as a front and back body (la) (tb) with the resin coating layer (9) facing the outer surface, and the inside contains the material to be packaged. The case is shown in which all four peripheral edges of the container are heat-sealed while containing a fluid such as a liquid seasoning or other contents (a). (10) indicates the seal portion.

In particular, in the case of FIG. 1, a part of the upper part of the content storage part (11) is formed as two take-out passages (12) separated by the seal part (10a) by the modified seal, and in the case of FIG. Similarly, in both cases, a perforation-like cut (7) formed in the composite film (6) forms one take-out passage (12). At the crossing position, the front and back bodies (la
) (lb) and are arranged so as to form a predetermined opening line.

In the case of the above example, the holes of the perforated cut lines (7) formed in the composite film (6) which is the base material are connected to the inner sealing resin layer (8) and the surface resin coating layer (9). In particular, the resin coating layer (9) on the outer surface is made of polyvinylidene chloride resin with excellent gas barrier properties, so it is suitable for liquid seasonings etc. that require gas barrier properties. It can be particularly suitably used in sealed packaging bags, and the contents (a) can be extremely well protected.

When taking out the content (a), the above-mentioned score line (5)
), the package can be reliably torn and opened without being distorted along the cut line (7) as shown in FIG. 3. That is, the composite film (6) that is the base material of the sheet material (2) has perforated cut lines because one of the films (5), such as L-LDPE film, has a strong tear strength due to its material. If (7) is provided, due to its tear resistance, it is difficult to tear in areas other than the cut line (7), and this acts to restrict bending in the tearing direction when opening the package. However, since the stretched film (3) laminated on this synthetic resin film (5) can be easily torn if there is a trigger for tearing, the cut line (7) formed on this composite film (6), i.e. can be opened reliably and easily in a straight line along the planned opening line. Therefore, it is possible to cleanly unseal a part of the set container and easily pour out or squeeze out the contents (a) in appropriate amounts.

For example, if the LDPE film is laminated with perforations formed only on the stretched film and the LDPE film is not perforated, it will be extremely difficult to tear and will be difficult to tear. If the product is torn, it is difficult to determine the direction, and even if the package is opened with great care, it may become distorted.However, in the case of products treated with the above-mentioned method of the present invention, it is not necessary to operate so carefully. The package can be reliably torn and opened along the opening line with almost no failure.

In each of the embodiments shown in FIGS. 5 and 6, a sheet material (2) similar to the above is folded in two so that the resin coating layer (9) is on the outer surface to form a front and back body (la) (lb), This example shows the case of a three-sided sealed bag in which the three peripheral parts other than the bent edge (13) are heat-sealed in the same manner as described above. Also in this example, the sealed part (1
A part of the accommodating part (11) for the contents (a) is extended to an arbitrary position of 0) to form a take-out passage (12).

The perforated cut line (7) is arranged at a position that crosses the take-out passage (12).

In the case of the bag of the above-mentioned form, it is possible to ensure excellent sealing properties and gas barrier properties as described above, and when opening the bag, the perforation-like cut line (7) makes it easy to follow the predetermined opening line. can be opened. Particularly during the tearing operation for opening, if you pinch the upper and lower sides of the cut line (7) with your fingers with the side of the take-out passage (12) as the tear start end, the take-out passage (12) will inevitably open. If the package is closed and the package is torn along the score line (7), the package can be opened straight without any fear of scattering the contents (a) such as the amount of liquid seasoning.

Note that the present invention can also be implemented in the same manner in various sealed bags that do not have a take-out passage by placing the perforated cut line (7) at a position that crosses a part of the storage part, and in this case, The package can also be reliably torn and opened along a predetermined opening line, making it easy to take out the contents. For example, in the case of a storage bag for tablets or a bag containing sterilized medical tools such as surgical scalpels, the bag can be opened along a predetermined opening line, making it easy to take out and use the bag.

In the above embodiment, a coating layer (9) of polyvinylidene chloride resin with good gas barrier properties was provided on the outer surface of the bag of the sheet material (2), but in some cases, the resin may be applied to the bag. It may also be used as a sealing layer by coating on a sealing resin layer (8) of polyethylene or the like on the inner surface. Also gas barrier
In the case of content (a) that does not require much properties, the coating layer of polyvinylidene chloride resin can be omitted, and in this case, the perforation-like cut holes are closed by the sealing resin layer (8). It peels off and maintains sufficient sealing properties. If necessary, add a coating layer (9) on the outer surface side.
) may be further coated with a heat-resistant resin such as acrylic resin.

In addition, as the stretched film (3) of the composite film (6) that is the base material of the sheet material (2), in addition to using a stretched polyvinyl alcohol resin film in a single layer, stretched polyvinyl alcohol resin film with the same characteristics as this film can be used. Stretched films such as nylon films and stretched polyester resin films can be used, and if necessary, two or more of the above stretched films can be used in a multilayer structure. In these cases, the polyvinylidene chloride resin coating layer may or may not be provided depending on the necessity of gas barrier properties.

In addition, the above-mentioned synthetic resin film with high tear strength (5
), L-LDPE film is particularly preferably used; however, in place of this, other synthetic resin films such as unstretched polypropylene resin films, which are resistant to tearing as described above, may also be used.

The thickness of each layer of the sheet material (2) varies depending on the type of contents and the packaging form, but for example, the stretched film (3) of the composite film (6) as the base material is 10 to 30 microns, L
-Synthetic resin film (5) such as LDPE film is 25
~35 microns, the resin coating layer (9) on the surface is 3
~10 microns, and the sealing resin layer (6) is 45~7
Generally, it is about 0 microns.

[Effects of the Invention] As described above, according to the sealed packaging bag of the present invention, the perforated cut line allows the bag to be easily torn and opened along the cut line of the parentheses without distortion. By making perforations in a film with high tear resistance such as high-density polyethylene, the tearing direction of the film is regulated to create a preset opening line, for example, a predetermined opening line that crosses a part of the container. The package can be reliably torn and opened on the line. Therefore, the contents can be taken out easily and reliably, and even if the contents are liquid or other fluid, there is no risk of spilling the contents or touching your hands, clothes, or floor when opening the package. The contents can be easily poured out or squeezed out without making a mess.

Moreover, the perforation-like cut lines are formed only in the composite film that is the base material of the sheet material, and are kept closed by at least the inner sealing resin layer. Even though the container has a cut line, it can be maintained in a predetermined sealed state and the contents can be well protected. In particular, when a coating layer of polyvinylidene chloride resin is provided, excellent sealing properties and gas barrier properties can be ensured, so that contents that require gas barrier properties can be well protected.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the present invention, Fig. 2 is a partially enlarged cross-sectional view taken along line ■-■ from the previous time, Fig. 3 is a perspective view when the package is opened, and Figs. FIG. 6 is a front view showing other embodiments. (A)...Bag body, (la) (lb)...Front and back bodies,
(2)...Sheet material, (3)...Stretched film, (
4)...Printed layer, (5)...Synthetic resin film with high tear strength, (6)...Composite film as base material, (7)...Perforated cut line, (8)... ... sealing resin layer, (9) ... polyvinylidene chloride resin coating layer, (10) ... sealing part, (11) ...
...Contains storage section, (12)...Take-out passage. Figure 1 Figure 3 Figure 5 A Figure 6

Claims (1)

[Scope of Claims] 1. A sheet material whose base material is a composite film made by laminating at least one layer of a stretched synthetic resin film and a synthetic resin film with high tear strength, wherein A bag body is formed of a sheet material having a perforated cut line for tearing and a sealing resin layer provided on one side, and the perforated cut line crosses a part of the storage part of the packaged object. A sealed packaging bag characterized by being arranged in the same manner and sealed at the periphery. 2. The sealed packaging bag according to claim 1, wherein the sheet material constituting the bag body is provided with a coating layer of polyvinylidene chloride resin on either the inner or outer surface of the bag.