JP2008105678A - Flexible packaging bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily unsealable flexible packaging bag having an excellent unsealability. <P>SOLUTION: In the flexible packaging bag 1 forming a content storage part 3 by performing the heat seal 2 of a peripheral edge or the like to at least a base material by using a laminated compound plastic film, a folding part structure 4 is formed on the compound plastic film forming the content storage part of the flexible packaging bag. A perforation or a sealing may be preferably performed in the folding part structure 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a soft packaging bag for packaging liquids, solids, powders, granules, and the like, and more particularly, to a soft packaging bag that is easy and has good opening properties.

  Conventionally, a flexible packaging bag using a plastic film is excellent in compressibility, flexibility, and cost, but has a negative effect in handling at the time of opening.

  As an opening method at the first stage, there is a method of cutting the opening part using a tool such as scissors, but the user does not always carry the tool, and there are restrictions on the use place of the flexible packaging bag .

  Next, there is a method in which cut processing (notch) or scratch processing is provided in the outer edge seal portion constituting the flexible packaging bag, and the opening is performed as a trigger (see, for example, Patent Document 1). However, in order to perform the above-described processing, it is a necessary condition that an outer edge seal portion exists, and the location and direction of opening are limited, and the opening portion does not necessarily match the physical properties of the contents.

  Moreover, in the flexible packaging bag using an easy peel film, although it is excellent in the openability from an outer edge seal part, it cannot open from the contents storage part surface of a flexible packaging bag.

  Another example is a flexible packaging bag that uses a multilayer film that has been bonded after being scratched only on the hard-to-cut film layer in the multilayer structure (see, for example, Patent Document 2). However, this method is not always easy to use, for example, it is necessary to fold the scratched portion when opening the bag, cut it with both hands, and open it.

  In addition, such a method is a method of cutting a part of the plastic film as a trigger for opening and expanding the film cutting part afterward, and the shape of the opening depends on the flow direction of the film or randomly. However, the desired opening shape cannot always be obtained.

  Furthermore, there is a method of making a perforation cut over the entire circumference of the opening in order to obtain an intended opening (see, for example, Patent Document 3). However, in this case, since the inner surface and the outer surface of the flexible packaging bag are electrically connected, they cannot be used for packaging contents that require complete external blocking.

The said prior art document is shown.
Japanese Patent Publication No. 61-39228. Japanese Utility Model Publication No. 63-147451. Japanese Utility Model Publication No. 57-202966.

  The present invention has been made in view of the above problems relating to the means for opening a soft packaging bag, and it is an object to provide a soft packaging bag that can be easily opened and has good openability. To do.

  According to a first aspect of the present invention, there is provided a flexible packaging bag in which a peripheral portion is heat-sealed by using a composite plastic film having a sealant layer laminated on at least a base material to form a content storage portion. The flexible packaging bag is characterized in that a folded portion structure with a sealant layer inside is formed on a composite plastic film in which a content storage portion is formed.

  Thus, according to the first aspect of the present invention, in the flexible packaging bag in which the peripheral portion is heat-sealed by using a composite plastic film having a sealant layer laminated on at least a base material to form a content storage portion, the soft packaging bag is provided. Since the folded plastic structure with the sealant layer inside is formed on the composite plastic film that forms the contents storage part of the packaging bag, the folded plastic film can be moved to the left and right simply by pinching the folded folded structure. Divided into two pieces, the flexible packaging bag can be easily opened.

  The invention of claim 2 is the flexible packaging bag according to claim 1, wherein the folded portion structure is subjected to scratching or perforation.

  Thus, according to the invention of claim 2, since the folded portion structure formed in the composite plastic film is subjected to scratching or perforation, the portion subjected to scratching or perforation is It can be a trigger for opening.

  The invention of claim 3 is the flexible packaging bag according to claim 1 or 2, wherein the folded portion structure is sealed.

  Thus, according to the invention of claim 3, since the folded portion structure formed on the composite plastic film is subjected to the sealing process, the scratched or perforated part and the inner surface of the flexible packaging bag It is possible to store contents that are required to be completely shut off without being in direct contact with each other.

  The invention of claim 4 is the flexible packaging bag according to claim 1, 2, or 3, wherein an easy peel film is used for the sealant layer of the composite plastic film.

  As described above, according to the invention of claim 4, since the easy peel film is used for the sealant layer of the composite plastic film, it can be easily peeled off from the seal portion when the seal portion is opened.

  Thus, according to this invention, it can open easily by the fundamental action of pinching and pulling the end of a packaging bag. A clean opening can be obtained in the body part of the container. An easy opening function can be formed with a single film without using an extra member such as a cut tape. It is possible to control the opening strength in various ways. Since a process for providing an opening function is provided at the time of manufacturing the packaging material, it is not necessary to provide the packaging machine with an extra function.

The present invention will be described in detail below based on one embodiment.
For example, as shown in FIG. 1, the flexible packaging bag of the present invention uses a composite plastic film (10) in which at least a base material (11) is laminated with a sealant layer (12) to heat-seal a necessary part such as the periphery ( 2) A flexible packaging bag (1) in which a content storage portion (3) is formed, and a sealant layer (12) is formed on the composite plastic film (10) in which the content storage portion of the soft packaging bag is formed. A folded portion structure (4) is formed with the inside facing.

  Then, the composite plastic film folded from the folded portion structure (4) can be easily obtained by subjecting the folded portion structure (4) to scratching, perforation (5), or sealing processing (6). Therefore, it is no longer possible to directly divide the portion into two left and right parts, or to apply a scratch or perforation to the inner surface of the contents storage portion, thereby completely shutting off the outside.

  The shape of the flexible packaging bag (1) may be any shape such as a three-side sealed bag, a four-side sealed bag, a gusset bag, a standing pouch, and a pouch with a cap in addition to the illustrated pillow-shaped three-side sealed bag. .

  Next, the composite plastic film (10) used for the flexible packaging bag (1) of the present invention will be described with reference to FIG. The composite plastic film (10) has a structure in which a sealant layer (12) is laminated on at least a base material (11). For the sealant layer (12), an easy peel film having easy peelability may be used, or a method may be employed in which an easy peel film is sandwiched between the folded portion structures for sealing. An intermediate layer (not shown) or the like can be laminated as necessary.

  As the substrate (11), a conventionally used film substrate such as a polyethylene terephthalate film or a stretched polypropylene film can be preferably used.

As the sealant layer (12), an easy peel film, specifically, a film prepared by mixing polybutene with polyethylene, a film prepared by blending polypropylene with low density polyethylene, and the like can be preferably used. Moreover, as a sealant layer (12),
When a film such as polyethylene or polypropylene is used, the same film as described above can be used as an easy peel film sandwiched between them.

A continuous composite plastic film (10) is perforated (5) at regular intervals in the direction perpendicular to the film flow direction (see FIG. 2B). The perforation processing (5) finally becomes a portion for forming an opening. In this case, the perforation processing (5) may be through the composite plastic film (10) or only a part of the film, but it can be easily separated by pulling the processed portion from both sides. It needs to be possible.
Instead of perforation, scratch processing having the same effect as perforation may be performed.

  Next, the composite plastic film is folded back with the sealant layer (12) on the inside with the perforation line (5) formed by perforation processing as the apex, and the formed folded portion structure (4) is pinched. Then, heat sealing is performed on the folded portion structure with the sealant layer (12) on the inside (see FIGS. 2C and 2D).

  For example, as shown in FIG. 3, the heat sealing process of the folded portion structure (4) may be a full seal that seals the entire folded portion or a line seal that partially seals the folded portion. However, it is necessary to form such that the perforation is completely concealed from the inner surface of the film after packaging, and the strength is supported so that the perforation portion is not easily broken at a stage other than opening.

  Moreover, as a method of controlling the opening strength at the time of opening, the seal temperature can be adjusted, the seal shape can be devised, or the material of the easy peel film of the sealant layer (12) of the composite plastic film can be changed. .

FIG. 1 shows an example of a pillow packaging bag as an embodiment of a soft packaging bag made using a composite plastic film having a folded portion as described above. As can be seen from FIG. 1, the inner surface of the content storage part of the flexible packaging bag and the perforated part of the folded part are separated by a seal and have an airtight structure.
By pinching left and right in the direction of the arrow when opening, the sealed portion is peeled and spreads, then the perforation is broken and opened, and the flexible packaging bag can be divided into two, and a straight and clean opening is obtained.

One Example of the flexible packaging bag of this invention is shown, (a) is perspective explanatory drawing, (b) is AA 'line sectional explanatory drawing of (a), (c) is (a). It is BB 'line sectional explanatory drawing. (A)-(d) is the plane explanatory view and partial cross-sectional explanatory view which show typically one Example of the manufacturing method of the composite plastic film which has a folding part used for the flexible packaging bag of this invention. (A)-(c) shows typically the shape of the sealing process given to the folding | turning part used for the flexible packaging bag of this invention, and shows the part by which the oblique line part is sealed, (a) Represents an entire seal in which the entire folded portion is sealed, (b) represents a line seal in which a portion of the folded portion is sealed, and (c) represents a partial seal in which the seal shape is devised.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Soft packaging bag 2 ... Heat seal part, such as a periphery 3 ... Contents storage part 4 ... Folded part structure 5 ... Perforation processing, flaw processing 6 ... Seal processing 10 ... Composite plastic film 11 ... Base material 12 Sealant layer 20 Contents

Claims (4)

In a flexible packaging bag in which a content storage portion is formed by heat-sealing the periphery using a composite plastic film in which a sealant layer is laminated on at least a base material,
A flexible packaging bag, wherein a folded portion structure having a sealant layer on the inside is formed on a composite plastic film in which a content storage portion of the flexible packaging bag is formed.   The soft wrapping bag according to claim 1, wherein the folded portion structure is subjected to scratching or perforation.   3. The flexible packaging bag according to claim 1, wherein the folded portion structure is subjected to a sealing process.   4. The flexible packaging bag according to claim 1, wherein an easy peel film is used for the sealant layer of the composite plastic film.

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