JP4211533B2 - Packaging bag having steam venting function and packaging body using the same - Google Patents

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 has a side seal in which a plastic film having a sealant layer is folded through a lateral fold line to form a front film and a back film, and both side edges are heat-sealed. In the packaging bag, the folded front side film is folded in the Z shape in parallel with the folding line in the vicinity of the lateral folding line over the entire lateral width to form a folded portion protruding from the surface of the packaging bag. A steam vent is drilled on the inner side of the part, and an easy peel tape with easy peelability to cover the steam vent on the inner side of the fold is parallel to the fold and heat-sealed to the fold. and it is inserted, the peripheral sides of the folded portion near the folding line, the front side film and the sealant layer between the back film is thermally fused to each other and on both sides of the side seals heavy Ri, characterized in that the sealing portion enters a state which has entered from the side seal on the inside is formed, a packaging bag having a vapor venting function.

Thus, according to the first aspect of the present invention, the folded front-side film is folded in the Z-shape in parallel with the folding line in the vicinity of the lateral folding line and projected from the surface of the packaging bag over the entire lateral width. And an easy peel tape that is easily peelable so as to cover the steam vent on the inner side of the folded portion is formed in parallel with the folded portion. to be inserted in heat-sealed to the folded portion, the periphery on both sides of the folding line of the folding portion near the sealant layers to each other on the front side film and the back film is heat-sealed to each other become heavy and on both sides of the side seals, a side seal is enters sealed portion in a state that has entered the inside formed and has so opening filled with contents and sealed sealed packaging bag (the bottom), a heating means such as a microwave oven When heat, pressure inflated with steam or the like, there is no such thing as a packaging bag is released while peeling the easy peel tape from the drilled venting port at the folding portion may burst.

  The invention according to claim 2 provides the steam venting function according to claim 1, characterized in that, in the invention of claim 1, the steam vent is any one of a small hole, a notch, or a slit. It is a packaging bag.

  Thus, according to the second aspect of the present invention, since the steam vent is any one of a small hole, a notch, and a slit, the optimum steam vent can be appropriately selected depending on the contents to be stored.

  The invention of claim 3 is the packaging bag having a steam venting function according to the invention of claim 1 or 2, characterized in that the periphery of the fold line is sealed over the entire lateral direction.

  As described above, according to the third aspect of the present invention, since the periphery of the fold line is sealed over the entire lateral direction, the unsealing property is improved. Further, when the packaging body is inflated by being placed horizontally and heated with a microwave oven or the like, the shape of the packaging body is more stable when sealed.

  According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, an easy-cut means is provided in the vicinity of the top seal that is separated from the folding portion. It is a packaging bag.

  Thus, according to the invention described in claim 4, since the easy-cut means is provided in the vicinity of the top seal away from the folding portion, the packaging bag can be easily opened without using a jig such as scissors. can do.

The invention according to claim 5 is the packaging body in which the contents are filled in the packaging bag having the vapor venting function according to claim 1, 2, 3 or 4, and the opening is heat-sealed. on heating the horizontal and package as has been the front film side up, characterized in that as the steam escapes from the venting port of the folding part by an increase in the internal pressure of the package, the steam venting function It is the package which has.

  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, when the internal pressure rises, the seal portion of the easy peel tape moves backward and the steam is stably discharged from the steam outlet.

  By setting the steam outlet on the inner surface of the folding part, when the bag is held, the steam comes out to the bag side and is safe. Further, since the seal portion is formed on the periphery of the folded portion, both hands are not hot and are easy to hold.

  When the packaging bag is placed horizontally, the steam outlet is at a high position, and the contents are not leaked from the steam outlet even if it is safe and cool.

  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 steam venting function of the present invention is formed by folding a sheet of plastic film having a sealant layer through a lateral fold line (a). 1) A backside film (2) is formed, and both side edges are side sealed (12).

The folded front film (1) is folded in a Z shape in parallel with the fold line (a) in the vicinity of the fold line (a) in the lateral direction over the entire width, and protrudes from the surface of the packaging bag so as to fold into the folded portion (3 ) Is formed. Further, a steam vent (14) is formed on the inner surface side of the folding part (3).

  The steam vent (14) may be provided as a small hole in the vicinity of the center of the folding portion (3), or may be cut out at the edge portion and provided as a slit.

  An easy peel tape (4) having easy peelability to cover the steam vent (14) is heat-sealed to the entire folding width in parallel with the folding portion (3) inside the folding portion (3). Has been inserted.

Peripheral sides of the folded portion near the folding line, the front side film (1) and the back sealant layer of the film (2) (22) to each other are thermally fused to each other an overlapping both sides of the side seal (12), from the side seal An intrusion seal portion (15) in a state of entering inside is formed.

  For this reason, a two-ply seal part is formed in a relatively wide range, and the part can be easily held with fingers or the like even immediately after being heated by heating means such as a microwave oven.

  The periphery of the fold line (a) may be heat-sealed (bottom seal (13)) with a constant width over the entire lateral direction.

  Further, near the fold line away from the folding part (3), easy cut means (16) by notches, perforation lines and the like are provided.

  By providing the easy-cutting means (16), the packaging bag can be easily torn and opened without using a cutting instrument such as scissors.

  The plastic film constituting the front film (1) and the back film (2) is 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, which is a plastic film or sheet having a relatively heat resistance, which is usually used as a packaging material, can be used.

  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 50 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 that is easily peelable and has excellent suitability for microwave ovens. More specifically, the thickness made by Toray Synthetic Film Co., Ltd. or Tosero Co., Ltd. is about 30-50 μm. An unstretched polypropylene resin-based easy peel film can be preferably used.

Hereinafter, the present invention will be described in detail by way of examples.
<Example 1>
As a plastic film to be the main film (1) on the front side and the main film (2) on the back side, an aluminum oxide-deposited polyethylene terephthalate film (thickness 12 μm) (21) / biaxially stretched nylon film (thickness 15 μm) (23) / A composite film having a layer structure of an unstretched polypropylene film (thickness 80 μm) (22) was prepared.

  Separately, as an easy peel tape (4), an easy peel film for retort, CMPS 013C (manufactured by Tosero Co., Ltd.) (thickness 50 μm) cut into a tape shape having the same width as the folded portion was prepared.

  Next, the one composite film prepared previously is folded through the transverse fold line (a) with the sealant layer (22) on the inside to form the front film (1) and the back film (2).

  Then, the front film is folded in a Z-shape so that it protrudes from the surface of the packaging bag in parallel with the folding line (a) over the entire width at a position slightly apart from the folding line (a) of the folded front film (1). In addition, a folded portion (3) is formed.

  The width of the folding part (3) is preferably wider than the width of the easy peel tape (4) described later from the viewpoint that it is necessary to completely cover the steam vent (14) formed in the folding part.

  Further, as shown in FIGS. 1 and 3, the folding portion (3) may be directed in the direction of the fold line (a), and although not shown, the opening portion (11) of the packaging bag You may turn to.

  In the central part of the folding part (3), the packing bag is filled with the contents, and then sealed and sealed to form a package. When heated by a heating device such as a microwave oven, the diameter for extracting steam generated is 2 mm. A steam vent (14) consisting of a small hole is formed.

  An easy peel tape (4) having an appropriate width and easy peelability is heat-sealed over the entire width along the fold line on the sealant layer (22) side of the folded portion (3). At that time, the steam vent (14) is covered with an easy peel film (4).

Moreover, the both sides of the periphery of the fold line (a) in the vicinity of the fold-in part (3) are on the sides of the both sides of the folded side film (1) and back film (2) by heat-sealing with each other. It becomes seal (12) heavy and forms a seal enters a state which has entered from the side seal on the inside (15).

  For this reason, the two-ply seal part is formed in a relatively wide range, and the part can easily hold the package with fingers even immediately after being heated by heating means such as a microwave oven.

  When a relatively narrow bottom seal (13) is formed on the periphery of the fold line (a) to connect two entering seals (15) formed on both sides of the packaging bag, the package (20 ) Is placed horizontally and heated by heating means such as a microwave oven, the swollen package can be placed in a stable state.

The front side film (1) and the back side film (2) subjected to such processing are subjected to side seal (12) with the sealant layers (22) facing each other, and the packaging bag having the vapor venting function of Example 1 (10) could be produced (see FIGS. 1A and 1B).

  It should be noted that, when opening from the bottom seal near the bottom seal at both end edges of the side seal, for example, an easy-cutting means (16) such as a notch or a tear guide wire is provided as a scissor. The packaging bag can be easily opened without using a tool such as.

  In addition, by setting the steam vent (14) on the inner surface side of the folding portion, the steam can be safely discharged to the bag side when holding the packaging bag.

  This packaging bag was filled with an appropriate amount of water (30), the opening (11) was hermetically sealed to form a package (20), and the easy peel tape (4) was heat-sealed to the package (20). The folded part (3) was placed sideways and heated in a microwave oven.

  The internal pressure increased with heating, and the packaging bag expanded, but the seal part of the easy peel tape (4) was retracted, the steam outlet (14) was opened, and the internal steam (v) escaped outside. The packaging bag did not break. 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 perspective explanatory drawing, (b) is the A-A 'sectional explanatory drawing of (a). (A)-(b) is sectional explanatory drawing which shows an example of the laminated constitution of the plastic film used for the packaging bag which has a vapor venting function of this invention. FIG. 1 shows a state in which a packaging bag having a steam venting function shown in FIG. 1 is filled with the contents and the opening is heat-sealed with the easy-peel film sandwiched in a tape shape with the folded portion facing up. (A) is a perspective explanatory drawing, (b) is an AA 'line sectional explanatory view of (a). (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 ... Folding part 4 ... Easy peel tape 10 ... Packaging bag 11 ... Top seal, opening 12 ... Side seal 13 ... Bottom seal 14 ... Vapor vent 15 ... Insert seal part 16 ... Easy Cutting means 20 ... Package 21 ... Base material 22 ... Sealant layer 23 ... Intermediate layer 30 ... Contents 101 ... Plastic film 102 ... First joint 105 ... Contents a ... Lateral Bending line v ... steam

Claims (5)

A packaging bag having side seals in which one side of a plastic film having a sealant layer is folded through a lateral fold line to form a front side film and a back side film, and both side edges are heat-sealed. Is formed in a Z-shape in the vicinity of the lateral fold line and in parallel with the fold line so as to protrude from the surface of the packaging bag, and a steam vent is formed on the inner surface side of the fold portion. Easy peel tape with easy peelability is inserted inside the folding part so as to cover the steam vent, and the whole lateral width is heat-sealed to the folding part in parallel with the folding part, and the folding near the folding part peripheral sides of the line, the sealant layers to each other on the front side film and the back film is heat-sealed to each other become heavy and on both sides of the side seals, inlet from the side seal on the inside Wherein the enter sealing portion in a state forme is formed, a packaging bag having a vapor venting function.   The packaging bag having a steam venting function according to claim 1, wherein the steam vent is any one of a small hole, a notch, and a slit.   The packaging bag having a steam venting function according to claim 1 or 2, wherein a peripheral edge of the fold line is sealed over the entire lateral direction.   The packaging bag having a steam venting function according to claim 1, 2 or 3, wherein an easy-cut means is provided in the vicinity of the folding line away from the folding portion. A packaging body in which the contents are filled in the packaging bag having a vapor venting function according to claim 1, and the opening is heat-sealed, and the front film surface on which the folded portion is formed is placed sideways upward. when heated placed the package, characterized in that as the steam escapes from the venting port of the folding part by an increase in the internal pressure of the package, the package having a steam venting function.

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