JP2005047605A - Packaging bag with steam venting function and packaging body using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging bag with a steam venting function, which can make an inner pressure of the packaging body generated by heating escape even when heated in a microwave oven, inside of which is prevented from staining, and which can be held with bare hands, and to provide the packaging body using the same. <P>SOLUTION: In the packaging bag with a standing pouch shape wherein a sheet of a double-folded bottom body film (1) and both end edges of two sheets of surface and back main body films (2 and 3) are applied with sealings (11) on their side parts, and the lower part end edges are applied with sealing (12) on their bottom parts into a bottom shape of a ship, on both corners of the upper part of the packaging bag, sub-seal parts (13) which are faced downward from the end edge of a top part (18) and parallel to the side part seals on the insides of the side part sealings (11) and whose ends are bent at right angles in directions of the side part sealings and are overlapped with the side part sealings, are provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a packaging bag for containing food, etc., in particular, a standing pouch type having a steam venting function that opens the packaging bag with the force of generated steam when heated using heating means such as a microwave oven. The present invention relates to a packaging bag and a package using the packaging bag.

  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.

  Also, holding the package with bare hands immediately after heating was dangerous because it was hot and could cause burns.

  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.

A package for a microwave oven in which a hole is formed in a part of a packaging bag in advance and the periphery of the hole is sealed has also been proposed (see, for example, Patent Document 1).
However, even in this method, it was impossible to hold the packaging bag with bare hands immediately after heating.

  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 vapor venting function that can be safely held with bare hands and a packaging body using the packaging bag.

  According to the first aspect of the present invention, a standing pouch is formed by sealing both side edges of a folded bottom film and two main and rear body films at the side, and sealing the bottom edge to the bottom of the ship. In the packaging bag of the type, the upper corners of the packaging bag are parallel to the side seal toward the inside of the side seal and below the top edge, and the tip is bent at a right angle to the side seal direction. A packaging bag having a steam venting function, characterized in that a sub-seal part overlapping the part seal is provided.

  As described above, according to the first aspect of the present invention, both end edges of one folded bottom film and two front and back main body films are side-sealed, and the lower edge is bottom-sealed to the bottom. In a standing pouch-type packaging bag, the upper corners of the packaging bag are parallel to the side seals on the inner side of the side seals and downward from the top edge, and their tips are perpendicular to the side seal direction. Since there is a secondary seal part that bends and overlaps the side seal, filling this packaging bag with a liquid material and hermetically sealing the opening to form a package, and heating with a heating device such as a microwave oven, with heating The internal pressure rises, the packaging bag expands, the secondary seal part is partly easily peeled off from the part bent at a right angle, and the unsealed part between the secondary seal part and the side seal becomes a steam vent passage, Vapor is released outside and the packaging bag is broken. Do not be.

  In addition, the contents above the side seals are not in direct contact with each other and are not heated even if they are held by hand.

  According to a second aspect of the present invention, in the first aspect of the present invention, in the auxiliary seal portions provided on both sides of the upper portion of the packaging bag, the separation width between the side seal and the auxiliary seal portion is different on the left side and the right side. A packaging bag having a steam venting function according to claim 1.

  Thus, according to the invention described in claim 2, by setting the separation width between the side seal and the sub seal so as to be different between the left side and the right side, the packaging body in which the upper portion of the packaging bag is sealed is made into a microwave oven or the like. When heated at, it becomes possible to create a time difference in steam removal between the left side and the right side, and priority can be given to either steam removal.

  Further, the invention of claim 3 is the invention of claim 1 or 2, wherein the seal in the width direction of the opening of the top when sealing the top of the packaging bag connects the left and right auxiliary seals, A packaging bag having a steam venting function, characterized in that the length does not reach the outer side seal.

  Thus, according to the third aspect of the present invention, the seal in the width direction of the opening of the top when the top of the packaging bag is hermetically sealed connects the left and right auxiliary seals, and the side seals on the outside thereof. Because the length does not reach the length of the package, when the package filled with the contents and sealed at the top of the packaging bag is heated with a microwave oven, the generated steam in the package is bent at a right angle to the secondary seal. It can be partly easily peeled off from the part and can be pulled out from the steam vent passage of the unsealed part between the sub seal part and the side seal regardless of the length of the top seal.

  The invention of claim 4 is characterized in that, in the invention of claim 1, 2 or 3, easy cut means for assisting easy tearing is formed at the upper end edges of the side seals. A packaging bag having a steam release function.

  As described above, according to the invention described in claim 4, since the upper end edges of the side seals are formed with easy-cutting means such as notches and notches that facilitate easy tearing, a jig such as scissors is attached. The packaging bag can be easily opened without using it.

  According to a fifth aspect of the present invention, a packaging body filled with the contents of the packaging bag having a vapor venting function according to the first, second, third, or fourth aspect and sealed with an opening is heated by a heating device. When the internal pressure rises, easy peeling occurs from the part bent at a right angle of the sub seal part, and the unsealed part between the side seal and the sub seal part becomes a steam vent, so that the internal pressure escapes from the steam vent. It is the package body which has the steam release function characterized by having performed.

  As described above, the following effects can be obtained by using the packaging bag of the present invention.

  That is, the shape swells uniformly without unevenness (the swell shape is stable).

  The internal pressure is applied to the apex by providing the sub seal portion.

  Since the seal moves backward due to the heat, it penetrates to the unsealed part and can release steam.

  By changing the width and shape of the left and right seals, the first steam outlet is removed with priority. Accordingly, it is preferable from the viewpoint of product liability (PL) if the opening opening is a notch on the opposite side.

  No drilling is required.

  By releasing the steam vent diagonally upward, it has the effect of preventing the fall in the microwave oven.

  Since the steam vent passage is long, there is a check valve effect.

  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 composed of one bottom film (1) folded in two and two main body films (2, 3). This is a standing pouch type packaging bag (10) in which both end edges are side-sealed (11) and the bottom edge is bottom-sealed (12) in a ship bottom shape.

  And at both upper corners of the packaging bag, it is parallel to the side seal (11), inside the side seal (11), downward from the edge, and its tip is bent at right angles to the side seal direction. A secondary seal portion (13) is provided to overlap the side seal (11).

  Between the side seal (11) and the sub seal portion (13) is an unsealed portion (15), which becomes a steam vent passage when the packaging bag is heated.

  In the secondary seal part (13) provided on both sides of the upper part of the packaging bag, the separation width (that is, the unsealed part) between the side seal (11) and the secondary seal part (13) is set to be different between the left side and the right side. You may do it.

  In addition, by forming easy-cutting means (16) that assists easy tearing at the upper end edges of the side seal, when opening the packaging bag, it can be cleaned without using a jig such as a bag. Also, the packaging bag can be opened easily.

  As the easy cutting means (16), generally known easy cutting means such as notches and notches may be used.

  In addition, after filling the packaging bag with contents (30) such as liquid, when sealing the top, the left and right sub-seal parts (13) are connected, and the outer side seal (11) It is necessary to have a seal (18) with a length that does not reach.

  In this way, when the package body (20) filled with the contents and sealed at the top of the packaging bag is heated with a microwave oven or the like, the steam generated by the expansion in the package body is discharged from a portion bent at a right angle. The seal part is partially peeled off, and can easily escape from the steam release passage of the unsealed part (15) between the sub seal part (13) and the side seal (11).

  The bottom film (1) and the main body films (2, 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. 3 (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 the adhesion with a sealant layer (12) to be 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, but a polypropylene resin is more preferably used in consideration of suitability for a microwave oven.

  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. 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 usual method for forming a standing pouch-type packaging bag is to sandwich a bottom film (1) folded in half with a generally known bag making machine or the like so that the sealant layer (22) is on the outside. The two main body films (2, 3) are faced to each other with the sealant layers facing each other, two side seals (11), and a bottom seal (12) in the shape of the bottom of the ship, and the desired size is obtained through a cutting process. The packaging bag.

  When performing the side seal (11), at the same time, in the vicinity of the two upper corners of the packaging bag, inside the side seal, parallel to the side seal from the top to the bottom, and the tip is perpendicular to the side seal direction. An auxiliary seal portion (13) that overlaps with the side seal is formed in an L shape that bends in a straight line.

  The unsealed portion (15) sandwiched between the side seal (11) and the sub seal portion (13) serves as a steam release passage.

  Usually, when cutting the packaging bags one by one, an easy-cut means (16) such as a notch is attached to the vicinity of the upper edge of the side seal (11) at the same time.

  Needless to say, punch holes (17) are provided in order to heat-seal the two main body films on the longitudinal edges of the bottom film (1).

  The packaging bag (10) thus produced is filled with, for example, a liquid content, and the opening (18) is sealed to form a package (20). The package is heated by a microwave oven or the like. When heated using the means, the internal pressure increases due to steam or the like, and the package expands. However, the sealant layers (22) are separated from the corners of the L-shaped sub-seal part (13), the inside of the package and the unsealed part (15) penetrate, and the expanded steam is unsealed part (15). It becomes a steam vent passage and is discharged to the outside, and the package does not burst.

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

  As the unstretched polypropylene film, Tosero CP RXC-18 (thickness 60 μm), which is a retort hot-seal receding type, was used.

  Using this composite film, in accordance with the above-mentioned method for producing a standing pouch, using a generally used self-standing bag making bag making machine, both side edges are side-sealed (11), and the lower edge is Bottom seal (12) and L-shaped secondary seal portion (13) at two upper corners, height: 140mm, width: 160mm, bottom film folding width: 40mm, side seal seal width A packaging pouch of Example 1 in the form of a standing pouch having a width of 8 mm and a seal width of the auxiliary seal on the left side (L); 3 mm, right side (R); 5 mm and an opening width; 120 mm was prepared (see FIG. 2).

  This packaging bag is filled with an appropriate amount of water as the contents (30), and the opening (18) between the two sub-seal parts (13, 13) is hermetically sealed to form a package (20). The body (20) was heated in a home microwave oven.

  The internal pressure rises with heating, and the packaging bag expands without unevenness. Since the seal retreats due to the heat of the sub-seal part (13), the left-side (R) sub-seal part peels off first and penetrates into the unseal part (15), and this unseal part becomes a steam vent. The internal steam was released and the packaging bag did not break.

It is an isometric view explanatory drawing which shows one Example of the packaging bag which has the steam release function of this invention. FIG. 2 is a perspective explanatory view showing a state in which the packaging bag of FIG. 1 is filled with contents and the top is hermetically sealed. (A)-(b) is sectional explanatory drawing which shows an example of the layer structure of the bottom body film and main body film which are used for the packaging bag which has the steam removal function of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bottom body film 2 ... Body film 3 ... Body film 10 ... Packaging bag 11 ... Side seal 12 ... Bottom seal 13 ... Sub seal part 15 ... Unsealed part 16 ... Easy cut means 17 Punch hole 18 Opening, top seal 20 Packing body 21 Base material 22 Sealant layer 23 Intermediate layer 30 Contents

Claims (5)

In a standing pouch-type packaging bag in which both end edges of the bottom body film folded in half and the two main body films on the front and back sides are side sealed, and the bottom edge is sealed to the bottom like a ship bottom,
The upper two corners of the packaging bag are parallel to the side seals on the inner side of the side seals and below the top edge, and the tips of the side bags are bent at right angles to the side seal direction and overlap the side seals. A packaging bag having a steam venting function, wherein a portion is provided.   The packaging bag having a steam venting function according to claim 1, wherein in the auxiliary seal portions provided on both sides of the upper portion of the packaging bag, the separation width between the side seal and the secondary seal portion is different between the left side and the right side. .   The seal in the width direction of the opening of the top when the top of the packaging bag is hermetically sealed is a length that connects the left and right sub seals and does not reach the outer side seal. A packaging bag having a steam venting function according to claim 1 or 2.   The packaging bag having a steam venting function according to any one of claims 1 to 3, wherein easy cut means for assisting easy tearing is formed at both upper edges of the side seal. .   When the packaging body in which the contents are filled in the packaging bag having the steam venting function according to claim 1, 2, 3, or 4 and the opening is sealed is heated by a heating device, and the internal pressure of the packaging body is increased, Easily peeled off from the part bent at a right angle of the seal part, the unsealed part between the side seal and the sub seal part becomes a steam vent, and the internal pressure escapes from the steam vent, A package having a steam release function.