JP2019104497A - Food bag for microwave cooking - Google Patents

Abstract

To provide a food bag for microwave cooking with a pressure releasing mechanism for preventing the rupture by heat expansion.SOLUTION: A front film 1 and a rear film 2 are overlapped, and three sides, i.e. the bottom and both sides, are heat sealed to form a bag with remaining one side open for filling with contents. The opening of the bag has a sealing part for sealing the bag after filling with contents, and at least one side of the heat-sealing part H1 has an unsealed part 5 which opens when one end reaches the side end. An olefinic film 4 is arranged of which one side is laminated between the front and the rear films in one side of the heat-sealing part including the unsealed part, and the other side is laminated between the front and the rear films in the other side of the heat-sealing part. The olefinic film is arranged that the material has nature to reduce its heat-seal strength by adding heat.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a packaging bag made of a synthetic resin film, and more particularly, to a packaging bag for food used when distributing food which can be heated by a microwave oven in a packaging bag.

  It is known that packaged food products to be provided for distribution in a sealed state after storing food in a packaging bag corresponding to a microwave oven made of a synthetic resin film are sealed, and in particular pouches containing retort food are widespread . In this type of packaged food, a consumer who purchases the food does not open the packaging bag and heats the food in the inside of the microwave as it is in a sealed state. Therefore, the internal pressure of the packaging bag is increased due to the thermal expansion of the water vapor that is evaporated from the food due to heating and the air in the packaging bag, and the inside of the packaging bag swells and finally bursts, and there is a danger of an accident such as food .

  In order to prevent this accident, a microwave compatible packaging bag (Patent Document 1) has been proposed in which a valve body for releasing the pressure generated by the heating is attached to the packaging bag in advance.

In addition, by providing an unsealed portion where one end reaches the side end and opens at the heat seal portion at the side of the packaging bag, the width of the heat seal portion at the side is narrowed by the unsealed portion. A microwave oven-ready type packaging bag has been proposed in which the bonding location of the narrow portion by heat sealing is spread and peeled off by the pressure generated and the pressure is released therefrom (Patent Document 2).
Patent No. 3006528 JP, 2016-74457, A

  However, the former known invention has a problem that the manufacturing cost of the packaging bag is increased due to the time, process and material cost for mounting the valve body. Also, in the latter known invention, when the heat seal strength is difficult to set, the output of the magnetron of the microwave oven is large, the water content of the food is large, etc., the internal pressure rises rapidly. Before the release pressure by the seal part works, the other part may be peeled simultaneously and the package may be destroyed, or even if the pressure can be released from the unsealed part, the loud burst noise may cause the contents to be scattered, There was a problem that surprised the consumer.

  The present invention has been created for the purpose of a microwave packaging bag that solves the above problems.

  That is, in the microwave compatible packaging bag according to the present invention, the front film and the back film are superposed, the bottom and the three sides of the both sides are heat-sealed, and the remaining side is an open portion for filling the contents. In the above open part, a sealed place for sealing after filling the contents is provided in the above-mentioned bag, and an unsealed part in which one end reaches the side end and opens at the heat seal part of at least one side In the provided packaging bag, one side is between the front film and the back film, and the heat seal part on one side including the unsealed part, the other side is between the front film and the back film and the heat seal on the other side An olefin-based film to be laminated is provided.

  The invention according to claim 2 is characterized in that, in the microwave compatible packaging bag, one side is a heat seal portion on one side including the unsealed portion between the front film and the back film and the other side is a front film The olefin-based film to be laminated between the rear surface film and the heat seal portion on the other side is characterized in that it is an easy peel film mainly made of PP or PE.

  The invention according to claim 3 is characterized in that, in the microwave compatible packaging bag, one side is a heat seal portion on one side including a non-sealed portion between the front film and the back film and the other side is a front film It is characterized in that the shape of the olefin-based film which is laminated on the heat seal portion on the other side between the rear surface films is band-like.

  The invention as set forth in claim 4 is characterized in that, in the microwave compatible packaging bag, the unsealed portion is positioned on the upper side of the packaging bag.

  The invention according to claim 5 is characterized in that, in the microwave compatible packaging bag, one side is a heat seal portion on one side including the unsealed portion between the front film and the back film and the other side is a front film The olefin-based film laminated between the rear surface films and laminated on the heat seal portion on the other side is fixed by heat sealing to one of the front surface film or the rear surface film.

  In the food packaging bag according to the sixth aspect of the present invention, the heat-sealed portion on the side is provided with a peninsula-like projecting portion projecting in the central direction of the packaging bag, and the other end of the unsealed portion It is characterized in that it reaches the area of the department.

  The microwave oven type packaging bag of the present invention having the above configuration is kept sealed by heat sealing and sealing the open portion after the food is accommodated inside, and at this time, one side is the front film and the rear surface. Heat sealing is carried out by interposing an olefin-based film laminated on the heat seal part on the other side between the front film and the back film on the other side and in the heat seal part on one side including the unsealed part between the films. Be done.

  And if it heats with a microwave oven in a sealed state, the internal pressure of a packaging bag will rise and expand | swell by the thermal expansion of the water vapor transpiration | evaporation from food by heating, and the air in a packaging bag. Water vapor and expanded air act to push and spread the bonded area of the films by heat sealing, but the bonded area where the olefinic film is laminated, that is, the width of the heat sealed area on the side is the unsealed area. The heat seal strength is lowered by heating due to the nature of the olefinic film, in the area where it is intended to narrow by a minute and press the heat generation seal to narrow the bonded area by the pressure generated by heating. Therefore, as intended, the portion is pushed apart and exfoliated so that the water vapor and expanded air escape from the outside to the outside, and the rise in internal pressure is suppressed, and other laminated portions are not pushed apart and the packaging bag Bursting will be prevented.

  In the above case, the strength of the packaging bag is reduced because the strength of the other bonded parts is maintained only at the area where the heat seal strength is reduced due to heating only at the unsealed part where release pressure is intended. And there is no risk of explosion due to transportation or impact.

  Moreover, although it is difficult to process so as to reduce the heat seal strength only around the unsealed portion intended for relief pressure, according to the present invention, it is easily realized only by interposing an olefin-based film in bag making. Because it is possible, it is possible to avoid a change in the production line and an increase in cost.

  In the present invention, it is desirable that the unsealed portion be located on the upper side of the packaging bag so that the contents do not leak at the time of pressure release. In this case, when the olefin-based film is fixed to one of the front film or the back-side film by heat sealing as in the invention according to claim 5, the olefin-based film is overlapped, whereby the upper side of one side of the packaging bag Since the rigidity near the spout is increased, it is possible for the consumer to have an effect of enhancing the feeling of the contents and making it easy to pour the contents.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view of the microwave oven corresponding packaging bag of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The disassembled perspective view of the microwave-adaptive packaging bag of this invention. . BRIEF DESCRIPTION OF THE DRAWINGS The partially cutaway perspective view of the microwave oven corresponding | compatible packaging bag of this invention. AA line sectional drawing of FIG.

  Hereinafter, specific embodiments of the present invention will be described based on the attached drawings. Here, a standing pouch is taken as an example of a food packaging bag to constitute an embodiment. FIG. 1 is a perspective view of the packaging bag, FIG. 2 is an exploded perspective view for showing the structure of the packaging bag, and FIG. 3 is a partially cutaway perspective view. In this packaging bag, the front film 1 and the back film 2 are opposed to each other, and the half-folded Gazette film 3 is folded up and sandwiched at the bottom, and both sides of each film and the bottom sides are heat-sealed portions H1 and H2, The three sides are sealed by heat sealing as H3, and the remaining one side is made into a bag in a state of being an open part for filling the contents.

  In this embodiment, a relief means is provided on the upper side of the packaging bag of the heat seal portion H1 on the left side of the packaging bag. That is, the heat seal portion H1 is provided with the unsealed portion 5 which is opened with one end reaching the side end. Further, in this embodiment, a peninsular protrusion 6 projecting in the central direction of the packaging bag is provided in the heat seal portion H1 so that the other end of the unsealed portion 5 reaches the area of the protrusion. A narrow heat seal portion is formed to surround three sides of the unsealed portion 5.

  The code | symbol 4 in the figure is an olefin type film interposed between the front film 1 and the back film 8 at the time of bag making. Here, the olefin film 4 is formed in a band shape, and one side is between the front film 1 and the back film 2 and the heat seal portion H1 on the left side including the unsealed portion 5 is provided between the front film and the back film. It is laminated on the heat seal portion H2 on the right side. In this embodiment, the olefin-based film 4 has a property that the heat-seal strength is reduced by heating, and for example, an easy peel film mainly made of PP or PE is assumed.

  Further, in this embodiment, the olefin-based film 4 is fixed to the back surface film 2 by the pair of upper and lower heat seal portions H4 and H4.

  In this embodiment, the front film 1 and the back film 2 are laminated films consisting of a base material layer and a sealant layer, and ONP (stretched nylon film) as a base material layer and CPP (non-stretched polypropylene film) as a sealant layer (Unstretched polypropylene film) is used. Also, the gusset film 3 has the same configuration as that described above.

  The above-mentioned materials of the respective films are merely examples, and it is needless to say that the present invention is not limited thereto as long as the functions of the present invention are realized.

  The microwave-ready type packaging bag of the present invention having the above configuration is sealed by heat sealing the heat-sealed portion set in the sealing portion after filling the contents such as food from the opening portion. It becomes stuffed food.

1 front film 2 back film 3 gusset film 4 olefin film 5 unsealed portion 6 projecting portion H1 heat sealing portion H2 heat sealing portion H3 heat sealing portion H4 heat sealing portion

Claims (6)

  The front film and the back film are stacked, and the bottom and both sides are heat-sealed, and the remaining one side is made into an open part for filling the contents, and the bag is sealed after filling the contents. Of the packaging bag provided with a sealing portion for sealing in the opening portion and an unsealed portion having one end opened to the side end and opened at the heat seal portion of at least one side, one side being the front film and the rear film The heat seal portion on one side including an unsealed portion in between is provided with an olefin film which is laminated on the heat seal portion on the other side between the front film and the back film on the other side. Microwaveable packaging bag.   An olefin-based film laminated on the heat seal of one side including the unsealed area between the front film and the rear film on one side and the heat seal on the other side between the front film and the rear film on the other side The microwave-enabled packaging bag according to claim 1, wherein the easy-peel film is made of PP or PE as a main ingredient.   An olefin-based film laminated on the heat seal of one side including the unsealed area between the front film and the rear film on one side and the heat seal on the other side between the front film and the rear film on the other side The microwave-enabled packaging bag according to claim 1 or 2, wherein the shape of (1) is band-shaped.   The microwave compatible type packaging bag according to any one of claims 1 to 3, wherein the unsealed portion is located on the upper side of the packaging bag.   An olefin-based film laminated on the heat seal of one side including the unsealed area between the front film and the rear film on one side and the heat seal on the other side between the front film and the rear film on the other side 5. The microwave-ready type packaging bag according to any one of claims 1 to 4, wherein the film is fixed to one of the front film and the back film by heat sealing.   The peninsular protrusion which protruded in the central direction of a packaging bag is provided in the heat seal part of the side part, The other end of the unsealed part was made to reach in the area | region of the said protrusion. Microwaveable packaging bag as described.

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