WO2005012134A1

WO2005012134A1 - Packaging bag with vapor extracting function, and packaged body using the same

Info

Publication number: WO2005012134A1
Application number: PCT/JP2004/010846
Authority: WO
Inventors: Kouichi Shiozaki; Hirofumi Kawai
Original assignee: Toppan Printing Co., Ltd.
Priority date: 2003-07-31
Filing date: 2004-07-29
Publication date: 2005-02-10

Abstract

[PROBLEMS] To provide a packaging bag with a vapor extracting function, capable of allowing the inner pressure in a packaged body produced by heating to escape even if the packaged body is heated in a microwave oven, and capable of being held with bare hands; and a packaged body. [MEANS FOR SOLVING PROBLEMS] A standing pouch-shaped packaging bag comprising a single twice-folded bottom film (1) and two main films (2, 3), front and back, which are sealed as at (11) at the opposite ends, and then bottom-sealed as at (12) like a ship’s bottom at their lower end edges, wherein disposed at the two upper corners of the packaging bag are width-increased rectangular wide seal sections (13) continuous with the side seals (11), with a vapor extracting port (14) formed in each wide seal portion (13).

Description

Specification

Packaging bag having steam release function and package using the same

Technical field

The present invention relates to a packaging bag for storing foods and the like, and in particular, has a steam releasing function of opening the packaging bag by the force of steam generated when heated using a heating means such as a microwave oven. The present invention relates to a bouch-type packaging bag and a package using the same.

Background art

Conventionally, there has been proposed a packaged food in which cooked or semi-cooked food or the like is filled in a packaging bag made of a heat-resistant plastic film and heated by a microwave oven to cook immediately before eating. .

[0003] However, when this packaged food is heated in a microwave oven, the packaging bag explodes due to internal pressure such as vapor pressure generated from the food or the like at the time of heating, and the contents are scattered, thereby contaminating the inside of the microwave oven. There was a drawback to do it.

[0004] Furthermore, holding the package with bare hands immediately after heating is dangerous because it is hot and may cause burns.

[0005] For this reason, before heating in a microwave oven, a small hole or the like is made in advance in the packaging bag using scissors or the like, or a part of the bag is cut out to reduce the internal pressure inside the packaging bag. Suppressing the rise to prevent the packaging bag from bursting.

[0006] However, in this method, since the steam generated after heating is immediately released to the outside of the packaging bag, the steam cooking effect by the steam is reduced and the drying of the food inside the packaging bag progresses. May cause food deterioration.

[0007] Also, a microwave oven package has been proposed in which a hole is formed in a part of a packaging bag and a perforation is made, and the periphery of the hole is sealed (for example, see Patent Document 1).

[0008] Prior patent documents are shown below.

Patent Document 1: JP-A-1-199881 (FIG. 1).

[0009] In this method, it is almost impossible to hold the packaging bag with bare hands immediately after heating, because it is hot. Disclosure of the invention

Problems to be solved by the invention

[0010] The present invention has been made to solve the above-described problems, and can release internal pressure of a package caused by heating even when heating and controlling with a microwave oven, and can reduce the inside of a bag. It is an object of the present invention to provide a packaging bag which has no vapor and has a steam release function that can be safely held with bare hands and a package using the same.

Means for solving the problem

[0011] The invention of claim 1 of the present invention is characterized in that one bottom film and two front and back main films folded in half are sealed at both side edges, and the bottom edge is sealed at the bottom like a ship bottom. In a standing bouch type packaging bag, a rectangular wide sealing portion having an increased width is provided continuously with the side seal at two upper corners of the packaging bag, and the wide sealing portion has A steam vent is provided

A packaging bag having a steam release function, characterized in that the packaging bag has a function of removing steam.

As described above, according to the first aspect of the present invention, both edges of the one folded bottom film and the front and back two main films are side-sealed, and the lower edge is formed into a bottom like a ship bottom. In a standing bouch-type packaging bag formed by sealing, at the upper corners of the two packaging bags, a rectangular wide sealing portion having an increased width is provided continuously with the side seal, The wide seal is provided with a steam vent, so that the packaging bag is filled with a liquid material and the opening is hermetically sealed to form a package. In both cases, the internal pressure rises, the packaging bag expands, the wide seal peels off, the vapor vent is exposed, and the internal steam escapes and is released, and the packaging bag does not break.

Also, the wide seal portion is not hot even if it is held because the seal portion is large.

[0013] The invention of claim 2 is the packaging bag having a steam release function according to the invention of claim 1, wherein the steam release port provided in the wide seal portion is a slit. You.

As described above, according to the second aspect of the present invention, since the steam vent provided in the wide seal portion is a slit, for example, even when retort sterilization treatment or the like is performed, heated water is supplied to the bag. It has the advantage of not getting inside. [0015] In the invention of claim 3, according to the invention of claim 1, the steam vent provided in the wide seal portion is a small hole, and an unsealed portion is formed around the small hole. It is a packaging bag having a function of releasing steam.

[0016] According to the third aspect of the present invention, the steam vent provided in the wide seal portion is a small hole, and the unsealed portion is formed around the small hole. Retort sterilization Heating water during processing is difficult to enter, and steam gushes out at once, so it is good. In addition, a steam vent can be designed at a position higher than the liquid level of the contents.

[0017] The invention of claim 4 is the invention of claim 1, 2 or 3, wherein the wide seal portions provided at both ends of the packaging bag have different seal widths on the left and right. This is a packaging bag that has a function of releasing steam.

[0018] Further, according to the invention of claim 5, in the invention of claims 1, 2, 3 or 4, the wide sealing portions provided on both end edges of the packaging bag have different sealing lengths on the left and right. A packaging bag having a function of releasing steam.

[0019] According to the invention as set forth in claim 4 or 5, as described above, the wide seal portions formed at both end edges of the packaging bag are provided with different seal widths or seal lengths on the left and right. , Either the left or right steam vent can be given priority to operate, which is convenient for use

[0020] Further, the invention according to claim 6 is characterized in that the both edges of one folded bottom film and the two front and rear body films are side-sealed, and the lower edge is bottom-sealed like a ship bottom. In the standing bouch type packaging bag, the upper side corners of the packaging bag are parallel to the side seals inside the side seals and below the top edge, and the front ends thereof are perpendicular to the side seal direction. A packaging bag having a steam release function, characterized by being provided with a sub-seal part which is bent and overlaps the side seal.

Thus, according to the invention of claim 6, both ends of one folded bottom film and two front and back main films are side-sealed, and the bottom edge is a bottom-sealed bottom seal. In the standing bouch-type packaging bag, the top corners of the top of the packaging bag are inside the side seals.

Parallel to the side seal below the edge, the tip is perpendicular to the side seal direction Since a sub-seal part that bends and overlaps the side seal is provided, this packaging bag is filled with a liquid material, and the opening is hermetically sealed to form a package, which is heated by a heating device such as a microwave oven. At the same time, the internal pressure rises, the packaging bag expands, and the sub-seal part is easily peeled off from the bent part at right angles, and the unsealed part between the sub-seal part and the side seal becomes a steam vent passage. As a result, the internal vapor escapes and is released, and the packaging bag does not burst. Also, the upper part of the side seal is not hot even if you hold it by hand because the contents are not in direct contact

[0022] In the invention of claim 7, in the invention of claim 6, in the sub-seal portions provided on both upper sides of the packaging bag, the separation width between the side seal and the sub-seal portion is set to the left side and the right side. And a packaging bag having a function of releasing steam.

[0023] According to the invention of claim 7, by setting the separation width of the side seal and the sub-seal portion to be different between the left side and the right side, the package body in which the upper part of the packaging bag is sealed can be electronically mounted. When heating with a range, etc., it is possible to make a difference in steam release between the left side and the right side, and it is possible to give priority to either steam release.

Further, the invention of claim 8 is the invention of claim 6 or 7, wherein the sealing in the width direction of the opening of the top portion when the top portion of the packaging bag is hermetically sealed is performed by the left and right auxiliary seals. This is a packaging bag having a steam venting function, characterized in that it has a length and a length that does not reach the side seals outside of the parts.

[0025] According to the invention of claim 8, as described above, the sealing in the width direction of the opening of the top portion when the top portion of the packaging bag is hermetically sealed connects the left and right sub-sealing portions and the outer side thereof. When the package is filled with the contents and the package sealed with the upper part of the packaging bag is heated with a microwave oven, etc., the generated vapor in the package will be generated at a right angle to the sub-sealing part. It can be easily peeled off partly from the curved part, and can escape from the steam vent passage of the unsealed part between the sub-seal part and the side seal in relation to the length of the top seal.

[0026] Further, according to the invention of claim 9, the both end edges of one folded bottom film and the two main body films are side-sealed, and the bottom edge is sealed at the bottom like a ship bottom. In the standing bag type packaging bag, a notch or an unsealed portion having a right angle or an acute angle is provided at both ends near the upper portion of the packaging bag, and the end of the notch or the unsealed portion is provided. A second side seal is formed along the edge, and the second side seal is formed continuously with the side seal.

As described above, according to the invention of claim 9, both ends of one folded bottom film and two main films of front and back are side-sealed, and the bottom edge is sealed like a ship bottom. In a standing bag type packaging bag, a notch or an unsealed portion having a right angle or an acute angle is provided at both ends near the upper portion of the packaging bag, and the notch or the unsealed portion is formed along the edge of the notch or the unsealed portion. Since the second side seal is formed continuously with the side seal, the packing bag is filled with a liquid material, and the opening is hermetically sealed to form a package. When heated with a heating device such as a stove, the internal pressure rises with heating, the packaging bag expands, the side seal provided around the notch peels off, and the inside of the bag and the notch penetrate and the inside of the package opens. Steam is released from the notch and released The packaging bag will not be breakage.

[0028] The invention according to claim 10 is the packaging according to claim 9, wherein the notch or the opening of the unsealed portion is formed in parallel with the bottom surface. It is a bag.

As described above, according to the tenth aspect of the present invention, since the opening of the notch or the unsealed portion is formed parallel to the bottom surface, the direction of the released steam is not on the opening side of the packaging bag. For

In addition, the contents can be taken out with confidence even immediately after heating.

[0030] Further, the invention of claim 11 is characterized in that, in the invention of claim 9, the notch or the opening of the unsealed portion is formed so as to be inclined toward the top surface side, and has a steam release function. It is a packaging bag.

[0031] According to the eleventh aspect of the present invention, since the opening of the notch or the unsealed portion is formed to be inclined toward the top surface, the direction of the released steam is changed to the opening side of the packaging bag. Therefore, the contents can be taken out immediately after heating.

[0032] Further, according to the invention of claim 12, in the invention of claim 9, 10, or 11, the second side seal provided along the edge of the notch or the unsealed portion is a left side and a right side. A packaging bag having a steam release function, which is characterized by having different seal widths.

[0033] Thus, according to the twelfth aspect of the invention, the notch is provided along the edge of the unsealed portion. Since the width of the second side seal is different between the left and right sides, when the internal pressure of the package rises and the internal vapor is released, the first side cutout is preferentially released from either the left or right cutout. S power

[0034] The invention of claim 13 is the invention according to claim 4, wherein the easy-cutting means for facilitating easy tearing is formed at both upper end edges of the side seal. A packaging bag having a steam release function, characterized in that the packaging bag has a steam release function.

[0035] According to the invention of claim 13, since the easy-to-cut means such as a notch or a notch for facilitating tearing is formed at the upper end edges of the side seal, scissors or the like can be cured. The packaging bag can be easily opened without using any tools.

[0036] Further, the invention of claim 14 is the invention according to any one of claims 9-112, wherein a portion above the second side seal provided along the edge of the notch or the unsealed portion. To

A packaging bag having a steam release function, characterized in that an easy-cutting means for facilitating easy tearing is formed.

As described above, according to the fourteenth aspect of the present invention, a notch, a notch, or the like that facilitates easy tearing is provided above the notch or the second side seal provided along the edge of the unsealed portion. Since the cutting means is formed, it is possible to easily open the packaging bag without using a jig such as scissors.

[0038] Further, the invention of claim 15 is directed to a packaging in which the contents are filled into a packaging bag having a steam release function according to claim 1, 2, 3, 4, 5 or 13, and the opening is heat-sealed. A package having a steam release function, characterized in that the body is heated by a heating device so that when the internal pressure of the package increases, the internal pressure escapes from a steam vent.

[0039] Further, the invention of claim 16 is directed to heating the package obtained by filling the contents into the packaging bag having the vapor release function according to claim 6, 7, 8 or 13 and heat-sealing the opening. When the package is heated by the device and the internal pressure of the package rises, easy peeling occurs from the part bent at a right angle to the sub-seal, and the unsealed portion between the side seal and the sub-seal serves as a steam vent, This is a package having a steam release function, characterized in that the internal pressure escapes.

[0040] The invention of claim 17 has the steam release function according to claim 9, 10, 11, 12, or 14. The package is filled with the contents and the package is heat-sealed at the opening.

When the internal pressure of the package increases, the second side sealing force provided along the edge of the notch or the unsealed portion allows the internal pressure to escape, so that the package has a steam release function. is there.

The invention's effect

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 bias (the swelling shape is stabilized). An internal pressure is applied to the top by providing a wide seal portion or by sealing the periphery of the notched or unsealed portion. Since the seal recedes due to the heat, it penetrates to the unsealed portion and vapor can be released. By changing the width and shape of the seal on the left and right, or the width and shape of the notch, the air exits preferentially from the first steam port. Thus, if the opening start opening is formed on the opposite notch, the surface area of product liability (PL) is also favorable. In addition, depending on the shape, drilling is not required, and steam is vented diagonally upward, which has the effect of preventing falling in a microwave oven.

BEST MODE FOR CARRYING OUT THE INVENTION

[0042] A packaging bag having a steam release function and a package using the same according to the present invention will be described in detail below based on one embodiment.

As shown in FIGS. 1 to 4, for example, the packaging bag having a steam release function of the present invention includes a single folded bottom film (1) and two front and back body films (2 A standing-bouch-type packaging bag (10) in which both edges of (3) are sealed on the side (11) and the lower edge is sealed on the bottom (12).

[0044] At the two upper corners of the packaging bag, a rectangular wide seal portion (13) wider than the width of the side seal is provided continuously to the side seal. (13) has a structure in which a steam vent (14) is provided.

[0045] The steam vent (14) formed in the wide seal portion (13) is preferably a slit or a small hole. In the case of a small hole, an unsealed portion (15) is preferably formed around the small hole. By doing so, for example, at the time of the retort sterilization treatment, the way of the steam through which the heating water enters enters at once.

[0046] In addition, the rectangular wide seal portion (13) formed at the two upper corners of the packaging bag has left and right sides. You can change the width and length (add a step) (see Figure 3).

This makes it possible to change the time during which the left and right steam release loca- tion steams escape, so that if necessary, either steam release loca- tion can be preferentially drained.

[0047] Furthermore, at both ends of the side seal at the upper corner where the wide seal portion is provided, easy-cutting means (16) for facilitating easy tearing is formed, so that the packaging bag is opened. In doing this, the packaging bag can be opened cleanly and easily without using jigs such as scissors. As the easy-cutting means (16), a generally known easy-cutting means such as a notch and a notch may be used.

[0048] 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. )reference).

[0049] The base material (21) is a layer serving as a base material of the packaging bag, and is in the form of a sheet or a film, and includes polyolefin (polyethylene, polypropylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, A relatively heat-resistant plastic film or sheet usually used as a packaging material such as polyethylene naphthate), polyamide (nylon 6, nylon 66, polyimide, etc.) or a combination of these polymers can be used.

[0050] Known additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a coloring agent can be added to the substrate (21), and are appropriately added as necessary.

Further, the surface of the base material (21) may be subjected to surface modification such as corona discharge treatment and anchor coating treatment, and the adhesiveness to a sealant layer (12) described later can be improved.

[0052] Further, a printing layer (not shown) can be formed on the front surface or the back surface of the base material, if necessary.

[0053] In order to improve the gas barrier property to the same level as that of aluminum foil, a thin film of an inorganic compound such as aluminum oxide or silicon oxide is formed on a plastic film as a base material by a vapor deposition method such as physical vapor deposition or chemical vapor deposition to a thickness of about 20 lOOnm. It is also possible to use an inorganic compound-deposited plastic finolem provided in the above.

In this case, a stretched polyethylene terephthalate film can be preferably used as the plastic film. [0054] The sealant layer (22) can be used as long as it is a heat-fusible resin such as polyethylene, polypropylene, an ethylene copolymer, or a saturated polyester. It can be used more preferably.

[0055] When it is necessary to improve the drop strength, the piercing strength, and the gas barrier property, as shown in Fig. 4 (b), an intermediate layer (23) is provided between the base material (21) and the sealant layer (22). As the intermediate layer (23) that can be interposed, for example, a nylon film, a polyester film, or the like can be preferably used. The intermediate layer may include a vapor deposited 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), or the intermediate layer (23) and the sealant layer (22) may be bonded by, for example, a two-part reaction. It can be easily performed by using a known laminating method such as a dry laminating method using a mold type polyurethane resin adhesive.

[0057] A usual method of forming a packaging bag of the standing bouch type is to use a generally known bag making machine or the like to fold the bottom film (2) so that the sealant layer (22) is on the inside. With the two main films (2, 3) facing each other with the sealant layers facing each other, sandwiching 1), two side seals (11) and a bottom seal in the shape of a ship bottom (12) are performed, and a cutting process is performed. And a packaging bag of a desired size.

[0058] At the time of performing the side seal (11), a rectangular wide seal portion (13) is formed at the upper corners of the packaging bag at the same time so as to be continuous with the side seal (11).

When performing the wide sealing, the steam vent (14) is also formed at the same time. When the steam vent (14) is a small hole, an unsealed portion (15) is provided around the small hole.

[0059] Normally, when cutting the packaging bags one by one, at the same time, easy cutting means (1

6) is attached near the upper edge of the side seal (11).

[0060] Needless to say, punch holes (17) are provided at the longitudinal edges of the bottom film (1) in order to thermally fuse the two main films to the front and back.

[0061] 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 heating hand of microwave oven etc. When the package is heated, the internal pressure increases due to steam or the like, and the package expands. However, the sealant layers (22) peel off from the corners of the rectangular wide seal portion (13) and reach the steam vent (14). The steam vent (14) expands the steam and discharges the steam to the outside. The package will not burst.

FIG. 5 and FIG. 6 are oblique perspective views showing a second embodiment of the packaging bag having a steam release function of the present invention.

In the second embodiment, as shown in FIGS. 5 and 6, similarly to the first embodiment, one bottom film (1) folded in half and two main and back body films are formed. This is a standing-bouch-type packaging bag (10a) in which both end edges of (2, 3) are side-sealed (11) and the bottom edge is a bottom-sealed bottom (12).

[0064] Then, at both upper corners of the packaging bag, the inside of the side seal (11) is parallel to the side seal (11) downward from the end edge, and the tip is perpendicular to the side seal direction. A sub-seal (13a) is provided to bend and overlap the side seal (11).

[0065] An unsealed portion (15) is provided between the side seal (11) and the sub-sealed portion (13a), and serves as a steam vent passage when the packaging bag is heated.

[0066] In the sub-seal portions (13a) provided on both sides of the upper portion of the packaging bag, the separation width (that is, the unsealed portion) between the side seal (11) and the sub-seal portion (13a) is different between the left side and the right side. May be set as follows.

[0067] Further, by forming the easy-cutting means (16) for facilitating easy tearing at both upper end edges of the side seal, a jig such as a pinch is not used when opening the packaging bag. The packaging bag can be opened cleanly and easily.

[0068] The easy cutting means (16) is the same as in the first embodiment. A generally known easy-cutting means such as a notch and a notch may be used.

After filling the packaging bag with the content (30) such as a liquid material, when sealing the top portion, the left and right sub-seal portions (13a) are connected, and the outer side seal is attached to the outer side seal portion. It is necessary to make the seal (18) of a length that cannot be reached.

[0070] By doing so, when the package (20) filled with the contents and the upper part of the package bag is sealed is heated in a microwave oven or the like, the steam in the package generated by expansion is bent at a right angle. Part The sub-seal part is partially peeled off from the position and can easily escape from the steam vent passage of the unsealed part (15) between the sub-seal part (13a) and the side seal (11).

[0071] 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 the base material (21) and the sealant layer (22) are laminated, and have a drop strength and a piercing strength. When the gas barrier property needs to be improved, an intermediate layer (23) can be interposed between the base material and the sealant layer as in the first embodiment (see FIG. 4). )

[0072] The types and characteristics of films that can be used for the base material (21), the sealant layer (22), and the intermediate layer (23) are the same as those in the first embodiment, and thus description thereof is omitted.

[0073] A usual method for forming a packaging bag of the standing bouch type is to use a generally known bag making machine or the like to fold the bottom film (2) so that the sealant layer (22) is on the inside. With the two main films (2, 3) facing each other with the sealant layer facing each other, sandwiching 1), two side seals (11) and a bottom seal in the shape of a ship's bottom (12) are performed. And a packaging bag of a desired size.

[0074] At the same time as the side seal (11), near the upper two corners of the packaging bag, inside the side seal, parallel to the side seal downward from the top, the tip is the side seal. A sub-seal (13a), which is L-shaped and bends at right angles to the direction and overlaps the side seal, is formed.

[0075] The unsealed portion (15) sandwiched between the side seal (11) and the sub-sealed portion (13a) forms a steam vent passage.

Usually, when cutting the packaging bags one by one, an easy-cutting means (16) such as a notch is attached near the upper end edge of the side seal (11).

[0077] Needless to say, punch holes (17) are provided at the longitudinal edges of the bottom body film (1) to thermally fuse the two main body films with the front and back sheets.

[0078] The packaging bag (10a) thus produced is filled with, for example, a liquid content, and the opening (18) is sealed to form a package (20). When heated using a heating means such as a microwave oven, the internal pressure increases due to steam or the like, and the package expands. However, the sealant layers (22) peel off from the corners of the L-shaped sub-seal part (13a) and penetrate the inside of the package and the unsealed part (15), and the expanded steam passes through the unsealed part (15). Becomes a steam vent passage It is not released to the outside and the package does not burst.

FIGS. 7 to 9 are perspective explanatory views showing a third embodiment of the packaging bag having a steam release function of the present invention.

In the third embodiment, as shown in FIGS. 7 to 9, similarly to the first and second embodiments, one folded bottom film (1) and two front and back films are used. This is a standing-bouch-type packaging bag (10b) in which both end edges of the main body film (2, 3) are side-sealed (11) and the lower edge is a bottom seal (12) in a ship bottom shape.

A notch (13b) having a right angle or an acute angle is provided at both ends near the upper portion of the packaging bag (10b), and the second side seal (14b) is formed along the edge of the notch. Has been made.

[0082] The notch (13b) causes the packaging bag to expand when the packaging bag filled with the content such as a liquid material is heated using a heating means such as a microwave oven due to an increase in internal pressure due to generated steam or the like. However, it becomes a steam vent passage when the generated steam is released.

The opening (k) of the notch (13) is formed parallel to the bottom surface as shown in FIG. 7, or is inclined toward the top surface as shown in FIGS. It is preferable that it is formed. The reason for this is that the top surface (18), which is the opening for taking out the contents of the packaging bag, and the opening (k) of the notch are in different directions, so that it is safe to prevent the steam from touching when taking out the contents.

[0084] The width of the second side seal (14b) provided along the edge of the notch can be changed between the left and right sides.

[0085] By changing the width of the left and right seals, it is possible to change the escape time of the steam that escapes from the left and right cutouts. Can be pulled out.

[0086] Further, an easy-cutting means (16) for facilitating easy tearing is formed above the second side seal (14b) provided along the edge of the notch, so that the packaging bag is formed. When opening the package, the packaging bag can be opened cleanly and easily without using a jig such as a pinch.

[0087] As the easy cutting means (16), a generally known easy cutting means such as a notch and a notch may be used. Further, the easy cutting means (16) may be provided on only one side of the packaging bag. [0088] Instead of the notch (13b), for example, an unsealed portion (13c) as shown in Fig. 10 may be provided. In this case, the unsealed portion (13c) plays the same role as the notch (13b).

[0089] 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 the base material (21) and the sealant layer (22) are laminated, and have a drop strength and a piercing strength. When the gas barrier property needs to be improved, the intermediate layer (23) can be interposed between the base material and the sealant layer, as in the first and second embodiments. (See Figure 4).

[0090] The types and characteristics of films that can be used for the base material (21), the sealant layer (22) and the intermediate layer (23) are the same as those in the first and second embodiments. Description is omitted.

[0091] A usual method of forming a standing-bouch-type packaging bag is to use a generally known bag-making machine or the like, and fold the bottom film (2) so that the sealant layer (22) is on the inside. With the two main films (2, 3) facing each other with the sealant layers facing each other so as to sandwich 1), two side seals (11) and a bottom seal in the shape of a ship bottom (12) are performed, and a cutting process is performed. And a packaging bag of a desired size.

[0092] Immediately before the side sealing is performed, cutouts (13b) having a right angle or an acute angle are formed in both edges near the upper portion. Therefore, the second side seal (14b) of the notch is formed along the edge of the notch.

[0093] Usually, when cutting the packaging bags one by one, an easy-cutting means (16) such as a notch is attached at the same time near the upper end edge of the second side seal (14b).

[0094] Needless to say, a punch hole (17) is provided at the longitudinal edge of the bottom film (1) to thermally fuse the front and back two main films.

[0095] The packaging bag (10b) thus produced is filled with, for example, a liquid substance, and the package (20) having the opening (18) sealed is heated using a heating means such as a microwave oven. When heated, the internal pressure rises due to steam and the like, and the package expands. However, the sealant layers (22) are separated from each other and penetrated from the right-angled or acute-angled portions of the second side seal (14b), and the expanded steam (V) has a notch as a steam vent passage to the outside, and It is not released and the package does not burst (see Figs. 10 (a), (b) and (c)). Example 1

[0096] Hereinafter, the present invention will be described in detail with reference to Examples.

Aluminum oxide-deposited polyethylene terephthalate film (thickness: 12 μm) (21) / biaxially stretched nylon film (thickness: 15 μm) (23) / not used as bottom film (1) and body film (2, 3) A composite film having a layered structure of a stretched polypropylene film (thickness: 60 μm (22) was prepared.

[0097] The unstretched polypropylene film used was Tocelo CP RXC_18 (thickness 60 / im), which is a hot-sealing receding type for retort.

[0098] Using this composite film in accordance with the above-described method for producing a standing vouch, both end edges are side-sealed (11) using a commonly used self-standing bag-making machine. Bottom seal at lower edge (12) with square wide seals (13) at two upper corners, height: 140mm, width: 160mm, bottom film fold width: 40mm, side Sealing width of seal: 8mm, width of left seal (L): 3mm, right (R): 5mm with unsealed part of steam vent of wide seal, opening width: 120mm The packaging bag of Example 1 was produced (see Fig. 1).

[0099] The packaging bag was filled with an appropriate amount of water, the opening (18) was hermetically sealed to form a package (20), and the package (20) was heated with a household microwave oven.

[0100] The internal pressure rises with heating, and the packaging bag expands evenly. Since the seal recedes during the heat of the wide seal portion (13), the wide seal portion on the left (R) first penetrates the unsealed portion, and the internal steam is released from the steam vent (14), and the packaging bag is removed. There was no break. Example 2

[0101] Using the bottom film (1) and the main body films (2, 3) having the same configuration as in Example 1, according to the above-described method for manufacturing a standing vouch, a generally used self-standing bag is manufactured. Using a bag machine, side seals at both edges (11), bottom seal at the bottom edge (12), and L-shaped secondary seals (13a) at the two upper corners, height; 140mm, width: 160mm, bottom film fold width: 40mm, side seal seal width: 8mm, width seal seal width left (L

); 3mm, right (R); 5mm, opening width; 120mm, standing bouch type The packaging bag of Example 2 was produced (see Fig. 5).

[0102] This packaging bag is filled with an appropriate amount of water as the content (30), and the two auxiliary seal portions (13a, 13a

) Is sealed tightly to form a package (20) (see FIG. 6).

) Was heated in a household microwave oven.

[0103] With heating, the internal pressure increases, and the packaging bag expands evenly. Since the seal retreats due to the heat of the sub-seal part (13a), the sub-seal part on the left side (R) peels off first and the unsealed part (1

a

5), the unsealed portion served as a steam vent, and the steam inside was released, and the packaging bag did not break.

Example 3

Using a bottom body film (1) and main body films (2, 3) having the same configuration as in Example 1, following the above-described method for manufacturing a standing vouch, a generally used self-standing bag manufacturing method is used. Using a bag machine, both edges are sealed side by side (11), the lower edge is sealed to the bottom (12), and notches (13b) are provided at both edges near the top, height: 140mm, width: 160mm Folding width of bottom film: 40 mm, seal width of side seal: 8 mm, second side seal width of notch periphery is left side (L

b

); 3mm, right (R); 5mm, opening width; 120mm, standing bouch type

b

The packaging bag of Example 3 was produced (see Fig. 7).

[0105] The packaging bag is filled with an appropriate amount of water as the content (30), and the opening (18) is hermetically sealed to form a package (20). The package (20) is placed in a household microwave oven. Heated.

[0106] The internal pressure rises with the heating, and the packaging bag expands evenly left and right. The seal retreats with the second side seal that is bent at a right angle to the notch.

b

Vapor (V) was released and the packaging bag did not break (see Fig. 11, ω).

Brief Description of Drawings

FIG. 1 is an explanatory perspective view showing one embodiment of a packaging bag having a steam release function of the present invention.

FIG. 2 is a perspective explanatory view showing another embodiment of the packaging bag having a steam release function of the present invention.

FIG. 3 is a perspective view showing still another embodiment of the packaging bag having a steam release function of the present invention. FIG.

[FIG. 4] (a)-(b) is a cross-sectional explanatory view showing an example of a layer structure of a bottom film and a main body film used for a packaging bag having a steam release function of the present invention.

FIG. 5 is a perspective explanatory view showing one example of a packaging bag having a steam release function according to the second embodiment of the present invention.

FIG. 6 is an explanatory perspective view showing a state in which contents are filled in the packaging bag of FIG. 5 and a top portion is hermetically sealed.

FIG. 7 is an explanatory perspective view showing one example of a third embodiment of the packaging bag having a steam release function of the present invention.

FIG. 8 is an explanatory perspective view showing another example of the third embodiment of the packaging bag having a steam release function of the present invention.

FIG. 9 is a perspective explanatory view showing still another example of the third embodiment of the packaging bag having a steam release function of the present invention.

FIG. 10 is a perspective explanatory view showing still another example of the third embodiment of the packaging bag having a steam release function of the present invention.

[FIG. 11] A packing bag having a vapor releasing function according to a third embodiment of the present invention is filled with contents, and the package having an opening sealed is heated by a microwave oven, and the package is expanded by heating. 8 (a) shows the case of the packaging bag of FIG. 7, and FIG. 8 (b) shows the packaging of FIG. 8 in a state where the second side seal is peeled off and steam escapes from the notch. (C) shows the case of the packaging bag of Fig. 9.

Explanation of symbols

1 · · · · Bottom film

2-Body film

3 · · · ·

10Packaging bags

10a. Packaging bag

10b

11 · · · 'Side seal 2 ·. 'J

3 · · · · Wide section

3a- • Secondary seal part

3b- • Notch

3c- 'Unsealed part

4- · • · Steam vent

4b- • Second side seal

5- · ■■ Unsealed part

6- ■… Easy cutting means

7--… Punch hole

8- ·… Opening, ceiling seal

0- ·… Package

···· Base material

2 · •-Sealant layer

· · · · · Middle layer

0 · · · · Contents

L- · · · The steam outlet of the wide seal portion is not sealed.

R-. • Unsealed steam outlet of wide seal part-Seal width with right side (right side)

L.-Seal width of sub seal part (left side)

a

R. • Seal width of sub seal part (right side)

a

L. • Seal width of the second side seal (left side)

b

R ■ ■ Seal width of the second side seal (right side)

b

k "■… aperture

Claims

The scope of the claims

[1] A standing-bouch-type packaging bag in which both edges of one folded bottom film and two main films of front and back are side-sealed and the bottom edge is sealed at the bottom like a ship bottom.

At the two upper corners of the packaging bag, a wide rectangular seal portion having an increased width is provided continuously to the side seal, and the wide seal portion is provided with a steam vent. A packaging bag having a function of releasing steam.

[2] The packaging bag having a steam venting function according to claim 1, wherein the packaging bag has a steam vent opening 1 slit provided in the wide seal portion.

3. The steam release function according to claim 1, wherein the wide seal portion is provided with a steam release location small hole, and an unsealed portion is formed around the small hole. Packaging bag.

4. The steam release function according to any one of claims 13 to 13, wherein the wide seal portions provided at both end edges of the packaging bag have different seal widths on the left and right. Having packaging bag

[5] The steam release function according to any one of claims 14 to 14, wherein the wide seal portions provided at both end edges of the packaging bag have different seal lengths on the left and right sides. Having packaging bags.

[6] A standing bouch-type packaging bag in which one end of a folded bottom film and two main body films are sealed side-by-side and the bottom edge is sealed to the bottom like a ship.

At both upper corners of the packaging bag, the inside of the side seal is parallel to the side seal downward from the top edge, and the tip is bent at a right angle to the side seal direction to overlap the side seal. A packaging bag having a steam release function, characterized by having a sub-seal portion.

[7] The steam release function according to claim 6, wherein in the sub-seal portions provided on both upper sides of the packaging bag, a separation width between the side seal and the sub-seal portion is different between the left side and the right side. Having packaging bags.

[8] The seal in the width direction of the opening at the top when the top of the packaging bag is hermetically sealed is left 8. The packaging bag having a steam release function according to claim 6, wherein the length is such that the right auxiliary seal portion is connected and does not reach the outer side seal.

In a standing bouch-type packaging bag in which both edges of one folded bottom film and two front and back main films are side-sealed and the bottom edge is sealed at the bottom like a ship bottom,

A notch or unsealed portion having a right angle or an acute angle is provided at both ends near the upper portion of the packaging bag, and a second side seal is made along the edge of the notched or unsealed portion. The second side seal is formed so as to be continuous with the side seal, wherein the packaging bag has a steam release function.

10. The packaging bag having a steam venting function according to claim 9, wherein the opening of the notch or the unsealed portion is formed in parallel with the bottom surface.

10. The packaging bag having a steam venting function according to claim 9, wherein the opening of the notch or the unsealed portion is formed to be inclined toward the top surface.

The steam according to any one of claims 9 to 11, wherein the second side seal provided along the edge of the notch or the unsealed portion has a different seal width between left and right. Extraction function

Packaging bag.

The steam vent function according to any one of claims 18 to 18, wherein easy cutting means for facilitating easy tearing are formed at both upper end edges of the side seal. Packaging bag.

13. An easy-cutting means for facilitating easy tearing is formed above a second side seal provided along an edge of the notch or the unsealed portion. A packaging bag having the function of releasing steam according to any one of the preceding claims.

Claims 1, 2, 3, 4, 5 or 13 are filled with the contents in a packaging bag having a steam release function according to claim 1, and the opening is heat-sealed, and the package is heated by a heating device, and the internal pressure of the package is increased. A package having a steam release function, characterized in that when the pressure rises, the internal pressure escapes from the steam release port.

Filling the contents into a packaging bag having a steam venting function according to claim 6, 7, 8, or 13, and opening the bag. When the inner body of the package is heated by a heating device and the internal pressure of the package is increased, the opening is bent easily at a right angle to the sub-sealing portion, so that the package is easily separated from the side seal and the sub-sealing portion. Wherein the unsealed portion serves as a steam vent, so that the internal pressure of the steam vent location escapes.

A package is filled with the contents in a packaging bag having a vapor release function according to claim 9, 10, 11, 12, or 14, and the opening is heat-sealed, and the package is heated by a heating device to reduce the internal pressure of the package. A package having a steam venting function, wherein, when ascended, the internal pressure escapes from a second side seal provided along a notch or an edge of an unsealed portion.