JP2005059867A - Packaging bag having function of steam venting and package using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag, which releases its inner pressure caused by heating when subjected to microwave heating and has a steam venting function of preventing the pollution of the bag interior. <P>SOLUTION: According to the packaging bag, a fold-back part 11 is formed laterally at the bottom side of a front body film 1 and is superimposed on a back body film 2. The fold-back part 11 on the front body film 1 and a part of the back body film 2 that is not overlap the front body film 1 and has an exposed sealant layer are made to overlap each other with a superimposed bottom film 3. Both ends of each overlapping film is sealed with side seals 12. At the bottom side on the front body film 1, the side seals of the fold-back part 11 and of the body film 1 superimposed on the fold-back part 11 are partially heat welded. One lateral edge of the superimposed bottom film 3 is sealed with a bottom seal 13, and the other lateral edge of the bottom film 3 and the edge of the fold-back part 11 of the front body film 1, which are overlap each other, are sealed with a lateral seal 14. An easy peal tape 4 is interposed between the fold-back part 11 of the front body film 1 and the bottom film 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a packaging bag for storing foods and the like, and in particular, a packaging bag having a steam vent function for opening a packaging bag with the force of steam generated when heated using heating means such as a microwave oven, and the like. The present invention relates to a package using

  2. Description of the Related Art Conventionally, packaged foods have been proposed in which a cooked or semi-cooked food or the like is filled in a packaging bag made of a heat-resistant plastic film and cooked by heating with a microwave just before eating.

  However, when this packaged food is heated in a microwave oven, the packaging bag ruptures and the contents are scattered due to internal pressure such as vapor pressure generated from the food during heating, and the inside of the microwave oven is contaminated. There were drawbacks.

  For this reason, before heating in a microwave oven, a small hole etc. are opened in a packaging bag beforehand, for example using scissors, or a part of a bag is cut off, and the rise in internal pressure inside a packaging bag is suppressed. The packaging bag was prevented from rupturing.

  However, in this method, water vapor generated after heating is immediately released out of the packaging bag, so that the steam cooking effect by the water vapor is reduced and the food inside the packaging bag is dried, which causes deterioration of the food. May come.

In order to solve these problems, for example, as shown in FIG. 4, a first joining portion that joins the same surface side with each other by a plastic film (101) and joins in a palm shape by heat sealing with a predetermined width. (102) is provided, and the contents (105) for heat treatment are hermetically packaged therein, and the first joint (102) is shifted to one side of the package. There has been proposed a heat-treatment packaging body that is an easy-open seal that performs relief when the internal pressure of the packaging body increases due to heating (see, for example, Patent Document 1).
However, even if this method is adopted, it is difficult to say that the content is scattered in the bag portion when the situation after heating is observed.

  The present invention has been made to solve the above-described problems, and even when cooked in a microwave oven, the internal pressure of the package produced by heating can be released, and the inside of the bag is contaminated. It is an object of the present invention to provide a packaging bag having a steam venting function and a packaging body using the packaging bag.

The invention of claim 1 of the present invention is a packaging bag composed of two main and two main body films having a sealant layer and a bottom film, and the two front and back are substantially the same size. The main body film faces each other with the sealant layer inside, and the bottom side of the main body film on the front side (or back side) is folded back in the lateral direction so that the sealant layer is exposed to the outside to form a folded portion, and the back side (or front side) ) And the main film on the front side (or the back side) are overlapped with the main body film on the front side (or the front side) and the sealant layer is exposed without overlapping the main body film on the front side (or the back side). Are overlapped with a bottom film, both end edges of each of the superimposed films are side sealed, and a book that overlaps with the folded portion on the bottom side of the main body film on the front side (or back side) The side seals at both edges with the film are partially heat-sealed to bottom seal the lateral edges where the bottom film is superimposed and to the other lateral edge of the bottom film In the packaging bag, the front side (or the back side) main film film folded portion and the bottom body film of the front side (or the back side) are laterally sealed. It is a packaging bag having a steam venting function, characterized in that it is laterally sealed with an easily peelable easy peel tape interposed therebetween.

  As described above, according to the invention described in claim 1, since the easy peel tape having easy peelability is interposed between the folded portion of the main body film on the front side (or the back side) and the bottom film, the contents are sealed. When a packaging bag that has been filled and hermetically sealed with an opening is heated by heating means such as a microwave oven, the internal pressure inflated with steam etc. will come out of the easy peel tape part of the easy peelable tape, and the packaging bag will burst. There is no.

  Further, the invention of claim 2 is the invention of claim 1, wherein the front side (or back side) main body film and the folded part overlying the main side film on the bottom side of the front side (or back side) main body film A packaging bag having a steam venting function, wherein steam holes penetrating each other are formed so as to overlap with an easy peel tape.

  Thus, according to the second aspect of the present invention, the portion overlapping the folded portion on the bottom side of the front side (or back side) main body film penetrates the front side (or back side) main body film and the folded portion overlapping therewith. Since the steam hole is formed so as to overlap the easy peel tape, when the packaging bag filled with the contents and hermetically sealed the opening is heated by heating means such as a microwave oven, the internal pressure inflated with steam etc. The easy-peel tape part of the easily peelable side seal of the side seal is partially retracted and pulled out of the steam hole, so that the packaging bag is not ruptured.

  Further, the invention of claim 3 is that, in the invention of claim 1 or 2, the notch that assists easy tearing of the bottom seal is provided in the vicinity of the bottom seal at both end edges of the side seal. It is the packaging bag which has the steam release function characterized by the above-mentioned.

  In this way, according to the invention described in claim 3, since the notch which assists easy tearing of the bottom seal is provided in the vicinity of the bottom seal at both end edges of the side seal, a jig such as scissors is attached. The packaging bag can be easily opened without using it.

  The invention of claim 4 is a packaging body in which the contents are filled in the packaging bag having the vapor venting function described in claim 1, 2, or 3, and the opening is heat-sealed. When the internal pressure of the package rises, the internal pressure escapes from between the easy peel film and the main body film (or bottom body film) at the bottom seal part. It is the package body which has the vapor removal function characterized by the above-mentioned.

  As described above, the following effects can be obtained by using the packaging bag having the steam release function of the present invention and the package using the packaging bag.

That is, since the escape of steam is on the opposite side of the opening, there is no danger of burns due to steam, and it is safe. By separating the position of the easy peel tape from the edge, the pointed end portion is strongly bonded, so that it is not unintentionally opened. Vapor hole can be installed easily by retracting easy peel. When the steam hole is provided, the steam hole is closed after heating, so that PL (burn) can be handled. The contents are not easily spilled from the steam hole. The opening for taking out the contents can be stably opened by a method such as providing a tearing guide line such as a notch or a perforation line, or using a straight-cut stretched nylon film for the substrate.

  A packaging bag having a steam venting function and a packaging body using the same according to the present invention will be described below in detail based on an embodiment.

  For example, as shown in FIGS. 1 and 2, the packaging bag having a vapor venting function according to the present invention includes two main and two main body films and one bottom film each having a sealant layer (22). The main body films (1, 2) of the same size on the front and back are opposed to each other with the sealant layer inside, and the bottom side of the main body film (11) is the sealant layer ( 22) is folded back in the lateral direction so as to be exposed to the outside, and a folded portion (11) is formed and superimposed on the main film (2) on the back side, and the folded portion (11) of the main film (1) on the front side and the back side The bottom film (3) is overlapped with the portion of the main body film (2) where the sealant layer (22) is exposed without overlapping the main body film on the front side.

  Also, both end edges of each of the superimposed films (1, 2, 3) are side sealed (21), and on the bottom side of the main body film on the front side, side portions of both end edges of the folded portion and the main body film overlapping therewith. The seal is partially heat-sealed (15).

  The lateral edge on which the bottom film (3) is superimposed is bottom sealed (22). Further, the other lateral edge of the bottom film and the lateral edge of the folded portion of the front-side main body film that overlaps the bottom film are laterally sealed (23).

  It is a packaging bag which consists of such a structure, Comprising: The easy peel tape (4) of easy peelability is interposed between the folding | returning part (13) and the bottom body film (3) of the said main body film (1). It consists of a structure with a horizontal seal (23).

  In addition, by using the main body film (1) on the front side and the main body film (2) on the back side in reverse, the horizontal seal (14) having easy-openability can be provided in either the left or right direction.

  The front side main body film (1), the back side main body film (2) and the bottom body film (3) constituting the packaging bag are composed of a composite film in which at least a base material (21) and a sealant layer (22) are laminated. (See FIG. 2 (a)).

  A base material (21) is a layer which becomes a base material of a packaging bag, and is a sheet-like or film-like material such as polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthate, etc.) Polyamide (nylon-6, nylon-66, polyimide, etc.) or the like, or a combination of these polymers can be used as a relatively heat-resistant plastic film or sheet that is usually used as a packaging material.

  For example, known additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a colorant can be added to the base material (21), and they are appropriately added as necessary. Furthermore, the surface of the base material (21) can be subjected to surface modification such as corona discharge treatment or anchor coating treatment to improve adhesion with a sealant layer (22) described later. Moreover, a printing layer (not shown) can be formed in the surface or back surface of a base material as needed.

In order to improve the gas barrier property like an aluminum foil, a thin film of an inorganic compound such as aluminum oxide or silicon oxide was provided on a plastic film as a base material to a thickness of about 20 to 100 nm by a vapor deposition method such as physical vapor deposition or chemical vapor deposition. An inorganic compound vapor-deposited plastic film can also be used. As the plastic film in this case, a stretched polyethylene terephthalate film can be preferably used.

  The sealant layer (22) can be used as long as it is a heat-sealable resin such as polyethylene, polypropylene, ethylene copolymer, and saturated polyester. However, in consideration of suitability for a microwave oven, the thickness of the polypropylene is about 60 to 80 μm. Resins can be used more preferably.

  When it is necessary to improve the drop strength, the piercing strength and the gas barrier property, an intermediate layer (23) may be interposed between the base material (21) and the sealant layer (22) as shown in FIG. 2 (b). it can.

  As an intermediate | middle layer (23), a nylon film, a polyester film, etc. can be used preferably, for example. The intermediate layer may include a vapor deposition layer of an inorganic compound such as silicon oxide or aluminum oxide.

  The substrate (21) and the sealant layer (22), or the substrate (21) and the intermediate layer (23), and the intermediate layer (23) and the sealant layer (22) are bonded together, for example, by a two-component reaction type polyurethane It can be easily performed using a known laminating method such as a dry laminating method using a resin adhesive.

  The easy peel tape (4) is preferably an easy peel film excellent in easy peelability and suitability for microwave ovens. More specifically, the thickness of Toray Synthetic Film Co., Ltd., Tohello Co., Ltd. or Showa Denko Co., Ltd. An unstretched polypropylene resin-based easy peel film having a thickness of about 30 to 50 μm can be preferably used.

Hereinafter, the present invention will be described in detail by way of examples.
<Example 1>
As the main body film (1) on the front side, the main body film (2) on the back side, and the bottom body film (3), an aluminum oxide-deposited polyethylene terephthalate film (thickness 12 μm) (21) / biaxially stretched nylon film (thickness 15 μm) ( 23) / unstretched polypropylene film (thickness 60 μm) (22) was prepared as a composite film having a layer structure.

  Separately, as an easy peel tape (4), an easy peel film TP-6 (manufactured by Showa Denko Co., Ltd.) (thickness 50 μm) was prepared.

  A tape-side easy peel film (4) is adhered to the edge of the bottom film (3), and the bottom side is folded back in the lateral direction so that the sealant layer is exposed to the outside, thereby forming a folded portion (11). The main body film (1) and the back side main body film (2) are overlapped so that the sealant layer (22) faces each other, and the folded portion of the front side main body film and the sealant layer of the back side main body film are exposed. And the bottom film (3) so that the easy peel film (4) enters inside.

  Both end edges of each overlapped film are side-sealed (12), and the side seals at both end edges of the folded portion and the main body film overlapping the folded-back portion on the bottom side of the front-side main body film are partially heat-sealed (15 )

The bottom edge (13) is sealed at the lateral edge of the bottom film (3).
Finally, the other lateral edge of the bottom film (3) and the lateral edge of the folded portion (11) of the front-side main body film which overlaps the lateral film (3) are laterally sealed (14). Thus, a packaging bag (10) having a steam release function of 1 could be produced.

  In addition, a steam hole (16) that penetrates the front side main body film and the folded portion that overlaps the front side main film and the folded portion that overlaps the front side main film on the bottom side of the front side main film is formed so as to overlap the easy peel tape. When the package filled with the contents is heated, the easy peel tape part of the easy-peeling side seal partly retreats to expose the steam holes, and the inflated internal pressure easily escapes from the steam holes. It will be.

  In addition, when opening from the bottom seal near the bottom seal at both edges of the side seal, a notch (17) and a tear guide line (a) to assist the opening will be provided, and tools such as scissors will be used. The packaging bag can be opened easily without the need.

  This packaging bag is filled with an appropriate amount of water (30), the opening (18) is hermetically sealed to form a package (20), and the easy peel film (4) is sandwiched between the package (20) and a tape. The horizontal seal (14) was placed sideways and heated in a microwave oven.

  The internal pressure rises with heating, and the packaging bag has expanded, but the side seal (14) rises and the easy peel film part opens, and the internal vapor escapes to the outside and the packaging bag breaks. There was no. Further, the contents (30) did not leak out.

One Example of the packaging bag which has a steam release function of this invention is shown, (a) is a plane explanatory drawing, (b) is the A-A 'sectional view explanatory drawing of (a). (A)-(b) is sectional explanatory drawing which shows an example of the layer structure of the main body film and bottom body film which are used for the packaging bag which has a vapor removal function of this invention. Fig. 1 shows a state in which the packaging body having the steam venting function is filled with the contents and the opening is heat-sealed with the bottom seal portion where the easy peel film is sandwiched in a tape shape placed sideways. (A) is a perspective explanatory view, (b) is an AA ′ line cross-sectional explanatory view of (a), (c) is a case where (a) is heated and the packaging body expands to generate steam. It is sectional explanatory drawing which shows the state which has discharge | released. (A)-(c) is explanatory drawing which shows an example of the conventional packaging bag for heat processing.

Explanation of symbols

1. Main body film (front side)
2. Main body film (back side)
3 ... Bottom film 4 ... Easy peel tape 10 ... Packaging bag 11 ... Folded part 12 ... Side seal 13 ... Bottom seal 14 ... Side seal 15 ... Ear adhesive part 16 ... Steam hole 17 ...... Notch 18 ... Opening (top)
20 ... Package 21 ... Base material 22 ... Sealant layer 23 ... Intermediate layer 30 ... Contents 101 ... Plastic film 102 ... First joint 105 ... Contents a ... Tearing guide wire

Claims (4)

It is a packaging bag consisting of two main and two main body films having a sealant layer on the front and back sides and a bottom film,
Two front and back body films of the same size are opposed to each other with the sealant layer on the inside, and the bottom side of the front (or back) body film is folded back in the lateral direction so that the sealant layer is exposed to the outside. If it overlaps with the main body film on the front side (or the back side) of the main body film on the back side (or the front side) First, the part where the sealant layer is exposed is overlapped with the bottom film, both end edges of each of the overlapped films are side sealed, and the folded part is formed on the bottom side of the main body film on the front side (or back side). The side seals on both edges with the body film that overlaps it are partly heat-sealed, and the bottom edge of the side film on which the bottom film is stacked is sealed at the bottom. One and lateral edges, in a packaging bag and a lateral edge of the folded portion of the body film of the front (or back) and lateral sealing, was overlapped thereto,
A packaging bag having a steam venting function, wherein an easy peel tape that is easily peelable is interposed between the folded portion of the main body film on the front side (or the back side) and the bottom film, and then laterally sealed.   In a portion overlapping the folded portion on the bottom side of the front side (or back side) main body film, a vapor hole penetrating the front side (or back side) main body film and the folded portion overlapping therewith is formed so as to overlap the easy peel tape. The packaging bag having a steam venting function according to claim 1, wherein the packaging bag is provided.   The packaging bag having a steam venting function according to claim 1 or 2, wherein notches are provided at both end edges of the side seal and in the vicinity of the bottom seal so as to facilitate tearing of the bottom seal. .   A packaging body in which the contents are filled in the packaging bag having the steam venting function according to claim 1, 2 or 3, and the opening is heat-sealed, with a horizontal seal with an easy peel film sandwiched in a tape shape facing upward Vapor venting function, characterized in that the internal pressure escapes from between the easy peel film and the main body film (or bottom body film) at the bottom seal part when the internal pressure of the package rises when placed horizontally and heated. A package having

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