JP2019206367A - Bag for heating - Google Patents

Abstract

To provide a repeatedly useable bag for heating.SOLUTION: A bag for heating 10 is made of sheet 12 with a foam layer 24 of polyolefin resin into a bag shape and includes a bag body 14 which can contain contents inside and an inward opening chuck 20 which is provided so as to extend to the pressure relief opening part 16 of the bag body 14 and can open and close this pressure relief opening part 16. The inward-opening chuck 20 is structured as such that the inward opening force required to open the inward opening chuck 20 by applying force from the inside of the bag body 14 across the inward opening chuck 20 becomes smaller than the outward opening force required to open the inward opening chuck 20 by applying force from the outside of the bag body 14 across the inward opening chuck 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a heating bag that can be heated by a microwave oven or the like in a state where an article is stored.

  Some packaging bags can be cooked with a microwave oven while containing cooked frozen food, chilled food, or the like (see, for example, Patent Document 1). Such a packaging bag has the problem that the contents are scattered or the microwave oven is soiled by being expanded and ruptured by water vapor generated during heating. Therefore, in Patent Document 1, by making the seal strength of the gas palm back pasting portion smaller than the seal strength of other heat seal portions, it becomes easier to open the gas palm back pasting portion when heated, Propose to escape.

JP 2002-68320 A

  The packaging bag of Patent Document 1 cannot be used repeatedly because the palm-pasted part is broken to release water vapor.

  The present invention has been proposed to solve these problems in view of the above-described problems related to the prior art, and an object thereof is to provide a heating bag that can be used repeatedly.

In order to overcome the above-mentioned problems and achieve the intended purpose, the heating bag of the present invention comprises:
A bag body made of a sheet having a foam layer made of a polyolefin-based resin, configured in a bag shape, and capable of storing articles inside,
An inner opening chuck provided to extend to the opening of the bag body, and capable of opening and closing the opening,
The inner opening chuck has an inner opening force required to open the inner opening chuck by applying a force from the inside of the bag body across the inner opening chuck from the outside of the bag body across the inner opening chuck. The gist is that it is configured to be smaller than the outer opening force required to open the inner opening chuck by applying a force.

  According to the heating bag according to the present invention, the closed inner opening chuck is opened by the increase of the internal pressure due to heating and the internal pressure is released, so that the bag can be prevented from rupture. If the inner opening chuck is closed, it can be used repeatedly.

It is a schematic perspective view which shows the heating bag which concerns on the suitable Example of this invention, and shows the state which the opening part for pressure relief closed. It is a schematic perspective view which shows the bag for a heating of an Example, and shows the state which the opening part for pressure relief opened. It is a schematic perspective view which shows the bag for a heating of an Example by a different direction from FIG. 1, and shows the state which the opening part for articles | goods opened. It is sectional drawing which shows the sheet | seat which comprises the bag for a heating of an Example. It is sectional drawing which shows an inner opening chuck | zipper in the heating bag of an Example, (a) is the state which the inner opening chuck | zipper closed, (b) applied the force which separates a sheet | seat inside an inner opening chuck | zipper. (C) shows a case where a force is applied to the outside of the inner opening chuck so as to separate the sheet. It is sectional drawing which shows an outer opening chuck | zipper in the heating bag of an Example, (a) is the state which the outer opening chuck | zipper closed, (b) applied the force which separates a sheet | seat inside an outer opening chuck | zipper. (C) is a case where a force that separates the sheet is applied to the outside of the outer opening chuck. It is sectional drawing which shows the chuck | zipper of the example of a change.

  Next, the heating bag according to the present invention will be described below with reference to the accompanying drawings by way of preferred examples.

  As shown in FIGS. 1 to 3, the heating bag 10 according to the embodiment can open and close a bag body 14 formed of a sheet 12 configured in a bag shape, and openings 16 and 18 provided in the bag body 14. Chucks 20 and 22. The heating bag 10 can seal the storage space 14 a inside the bag body 14 by closing the chucks 20 and 22. The heating bag 10 is formed on the inner opening chuck 20 provided in the pressure release opening 16 formed on one side of the bag main body 14 and on the other side different from one side of the bag main body 14 (on the opposite side in the embodiment). And an outer opening chuck 22 provided in the article opening 18. The heating bag 10 allows the article M to be taken in and out of the storage space 14a of the bag main body 14, and the internal pressure of the storage space 14a that rises with heating in a microwave oven or the like is released. 16 is configured to escape outward.

  As shown in FIG. 1 to FIG. 3, the bag main body 14 is a sheet 12 formed in a bag shape, and has an aspect (bottom seal bag) in which the edges of two sheets 12 facing each other are sealed as in the embodiment. Etc.), an aspect in which one sheet 12 is bent and the opposite edges are sealed (side seal bag, etc.), or a so-called back-pasted part in which the edges of the sheet 12 facing each other are sealed (pillows) Etc.). Further, the bag body 14 may be in the form of a flat bag or a gusseted bag having a gusset as in the embodiment, and the shape is not limited to the rectangular shape as in the embodiment, and the article M to be stored and the use It can be made into a suitable shape according to the above. The bag body 14 of the embodiment includes seal portions 15a and 15b formed by joining the sheets 12 together by welding with heat, adhesion with an adhesive, or the like. The 1st seal | sticker part 15a is formed over the whole edge of a group. Further, the bag body 14 has a second seal portion 15b formed on one side of the other side of the other side of the bag body 14 so as to extend in a range smaller than the entire side, and the other side of the other side. The seal portions 15a and 15b are not provided. And the bag main body 14 has the opening parts 16 and 18 in the unsealed part between the facing sheets 12 and 12, and the article opening 18 opens over the entire edge of the bag main body 14. On the other hand, the pressure release opening 16 opens in a range smaller than the entire edge of the bag body 14 (about half in the embodiment). Thus, it is preferable to form the pressure release opening 16 smaller than the article opening 18.

The sheet 12 desirably has no or small air permeability, moisture permeability, and water permeability for the purpose of preserving the article M stored in the storage space 14a. As shown in FIG. 4, the sheet 12 includes at least a foam layer 24 made of a polyolefin-based resin such as polyethylene or polypropylene. The polyolefin resin is preferably a polypropylene resin because of its excellent heat resistance. The foam layer 24 is preferably made of a soft foam because it can absorb impact, and may have either an open cell structure in which cells (bubbles) are connected to each other or a closed cell structure in which cells are not connected to each other. In order to protect the article M stored in the storage space 14a, an open cell structure is preferable. The foam layer 24 is preferably composed of a foam having a cell diameter of 300 μm or less, more preferably 50 μm to 300 μm, and the heat insulation can be improved by the fine cell diameter. The foam layer 24 is lightweight and heat insulation is excellent its density is preferably in the range of ^{40kg / m 3 ~60kg / m 3} , If it is a sheet 12 of foam layer 24 within this range It is suitable as the heating bag 10. The foam layer 24 is composed of a foam having a thermal conductivity of 0.040 w / (m · k) or less, more preferably 0.026 w / (m · k) to 0.040 w / (m · k). It is preferable that the heat insulating property is excellent. Thus, when heated, the heating bag 10 itself is hardly heated and the stored article M is hardly cooled.

  The foam layer 24 is particularly preferably a foam obtained by a supercritical gas foaming method using carbon dioxide or nitrogen as a foaming agent. The foam using carbon dioxide or the like as a foaming agent has less volatile organic compounds (VOC) and the like, and is cleaner than organic foaming agents such as azo compounds and inorganic foaming agents such as ammonium carbonate. In particular, it may be applied to the heating bag 10 that stores food as the article M. The foam obtained by the supercritical gas foaming method is suitable as the heating bag 10 because it can have the physical properties preferable as the foam layer 24 described above.

  The sheet 12 may have a single-layer structure including only the foam layer 24. However, as shown in FIG. 4, in addition to the foam layer 24, the sheet 12 has predetermined functions such as strength improvement, heat insulation, and air permeability. It is preferable that it is a laminated structure provided with the functional layer 26 which exhibits. As the functional layer 26, for example, one or a plurality of solid type synthetic resins and paper can be selected and used. As the solid type synthetic resin, for example, a film such as polypropylene having a good laminating property (for example, low melting point polypropylene) or a polyvinylidene chloride having a good gas barrier property (so-called salan resin) is laminated on the foam layer 24 to increase the tear strength. It is appropriately selected according to the required function, such as improving the gas barrier property or coating the foam layer 24 with a silicone resin or the like. The paper is appropriately selected according to the required function, for example, paper coated with silicone resin or the like. In the embodiment, the functional layer 26 is laminated inside the foam layer 24, and the bag body 14 of the embodiment is disposed so that the foam layer 24 constitutes the outer surface of the heating bag 10, and the functional layer 26 is heated. It arrange | positions so that the inner surface of the bag 10 may be comprised.

  As shown in FIG. 4, the foam layer 24 preferably includes a skin layer 24a having a resin density higher than that of other portions. The skin layer 24a is formed on the surface of the foam layer 24. In the embodiment, the inner surface of the foam layer 24 is the skin layer 24a, and the functional layer 26 is laminated on the skin layer 24a. Thus, by laminating the functional layer 26 on the skin layer 24a, it becomes difficult to impregnate the foam layer 24 with an adhesive for joining the foam layer 24 and the functional layer 26, or the functional layer 26 obtained by coating. There are various merits when it becomes easy to make the thickness of the layer constant, and when the functional layer 26 is laminated.

  When the inner opening chuck 20 opens the inner opening chuck 20 by applying a force from the inside of the bag main body 14 with the inner opening chuck 20 interposed therebetween, the inner opening chuck 20 sandwiches the inner opening chuck 20 with the inner opening chuck 20. The inner opening chuck 20 is configured to be smaller than the outer opening force when a force is applied from the outside to open the inner opening chuck 20. That is, the inner opening chuck 20 is difficult to open from the outside of the pressure release opening 16 while the pressure release opening 16 is easy to open from the storage space 14a side. On the other hand, the outer opening chuck 22 sandwiches the outer opening chuck 22 by the outer opening force when the outer opening chuck 22 is opened by applying a force from the outside of the bag body 14 with the outer opening chuck 22 interposed therebetween. Thus, the inner opening force when the outer opening chuck 22 is opened by applying a force from the inside of the bag body 14 is configured to be smaller. That is, the outer opening chuck 22 is easy to open from the outside of the article opening 18, whereas the article opening 18 is difficult to open from the storage space 14a side. The heating bag 10 is set such that the sealing strength of the bag body 14 and the tear strength of the sheet 12 are larger than the force required to open the chucks 20 and 22.

  As shown in FIGS. 5 and 6, the inner opening chuck 20 and the outer opening chuck 22 have the same basic configuration that is a male / female engagement structure. Specifically, the chucks 20 and 22 are arranged on one sheet 12 facing the openings 16 and 18 in a direction along the opening edge of the openings 16 and 18 (the inner and outer directions of the bag body 14 in the openings 16 and 18). In the direction along the opening edge of the openings 16, 18, the male-shaped locking portion 28 provided so as to extend in the crossing direction) and the other sheet 12 facing each other at the openings 16, 18 are extended. It is comprised from the female-shaped latching receiving part 30 provided so that it might do. The locking portion 28 protrudes in a direction away from each other in the inner and outer directions of the bag body 14 at the openings 16 and 18 at the tip of the male side extending portion 32 extending from the one sheet 12 toward the other sheet 12. A pair of locking claws 34a and 34b are provided. The latch receiving portion 30 is disposed at the opening portions 16 and 18 so as to be separated from each other in the inner and outer directions of the bag body 14 and extends from the other sheet 12 toward the one sheet 12. , 36b is formed in a concave shape opening in one sheet 12. Receiving claws 38a and 38b projecting toward the mating side are provided at the tips of the pair of female side extending portions 36a and 36b, respectively, and the locking receiving portion 30 projects in a pair toward each other. The locking portion 28 is engaged and disengaged between the receiving claws 38a and 38b (female side extending portions 36a and 36b).

  More specifically, as shown in FIGS. 5 and 6, the chucks 20 and 22 are configured such that when the locking portion 28 is fitted between the pair of receiving claws 38 a and 38 b, the pair of locking claws 34 a and 34 b Of these, the inner locking claw 34 a that protrudes toward the inside of the bag body 14 and the inner receiving claw 38 a that protrudes toward the outside of the bag body 14 out of the pair of receiving claws 38 a and 38 b are hooked. Further, the chucks 20 and 22 are arranged on the inner side of the bag main body 14 of the pair of receiving claws 38a and 38b, and on the inner side of the bag main body 14 of the pair of receiving claws 38a and 38b. The outer claws 38b projecting toward the hook are caught. As described above, the chucks 20 and 22 are engaged with the inner claws 34a and 38a and the outer claws 34b and 38b with each other. 16 and 18 are sealed.

  As shown in FIG. 5, the inner opening chuck 20 is configured such that the hook between the inner locking claw 34 a and the inner receiving claw 38 a is more easily released than the hook between the outer locking claw 34 b and the outer receiving claw 38 b. As shown in FIG. 6, the outer opening chuck 22 is configured such that the catch between the outer locking claw 34 b and the outer receiving claw 38 b is more easily released than the catch between the inner locking claw 34 a and the inner receiving claw 38 a. As described above, the inner opening chuck 20 and the outer opening chuck 22 have the reverse strength relationship between the hooks between the inner claws 34a and 38a and the hooks between the outer claws 34b and 38b. The opening chuck 20 and the outer opening chuck 22 have the same components, but the components are arranged in a symmetrical relationship with each other in the inner and outer directions.

  As a configuration in which the catch between the one claw 34a, 38a (34b, 38b) is easier to come off than the catch between the other claw 34b, 38b (34a, 38a), for example, the following various things can be used: One or a combination of two or more can be employed. In the embodiment, the cost when one claw 34a, 38a (34b, 38b) is hooked is made smaller than the cost when the other claw 34b, 38b (34a, 38a) is hooked. This makes it easier for the hooks of the one claw 34a, 38a (34b, 38b) to come off than the hook of the other claw 34b, 38b (34a, 38a) (see FIGS. 5 and 6). Also, one of the claws 34a, 38a (34b, 38b) is formed to have an obtuse angle with respect to the extending portions 32, 36a (32, 36b), or the claws 34a, 38a (34b, 38b) themselves are arcuate. And the other claws 34b, 38b (34a, 38a) are formed so as to have an acute angle with respect to the extending portions 32, 36b (32, 36a), so that one of the claws 34a, 38a is formed. (34b, 38b) is more easily disengaged than the other claws 34b, 38b (34a, 38a) (see FIGS. 5 and 6). Further, the extension part 36a (36b) provided with one receiving claw 38a (38b) is linked to the deformation of the sheet 12 more than the extension part 36b (36a) provided with the other receiving claw 38b (38a). By making it easy to do, the catches between the one claw 34a, 38a (34b, 38b) are easier to come off than the catches between the other claw 34b, 38b (34a, 38a) (see FIGS. 5 and 6). . Furthermore, the extension 36b (36a) provided with the other receiving claw 38b (38a) is bent by making it thinner than the extending part 36a (36b) provided with one receiving claw 38a (38b). By making it easy, when the hooks of one of the claws 34a, 38a (34b, 38b) are released, the hooks of the other claws 34b, 38b (34a, 38a) are also easily released (FIGS. 5 and 5). 6).

  When the heating bag 10 is heated by a microwave oven or the like and the internal pressure rises due to the heating or expansion of water vapor or internal air generated from the stored article M, the heating bag 10 is opposed to the inside of the inner opening chuck 20 and the outer opening chuck 22. The sheets 12, 12 to be inflated are separated from each other. As a result, the inner opening chuck 20 is pulled by the sheet 12 from the inside, and the inner receiving claw 38a is displaced away from the outer receiving claw 38b, so that the allowance between the inner receiving claw 38a and the inner locking claw 34a is small. Moreover, since the contact surface of the inner receiving claw 38a and the inner locking claw 34a has an obtuse angle, the inner receiving claw 38a and the inner locking claw 34a are disengaged (see FIG. 5B). In addition, since the outer female side extending portion 36b provided with the outer receiving claw 38b is formed thinner than the inner female side extending portion 36a and is easily bent, the outer receiving claw 38b and the outer locking claw 34b are detached, The inner opening chuck 20 is opened, and water vapor is discharged outward from the opened pressure release opening 16. On the other hand, even when the outer opening chuck 22 is pulled by the sheet 12 from the inside and displaced so that the inner receiving claw 38a is separated from the outer receiving claw 38b, the allowance between the inner receiving claw 38a and the inner locking claw 34a is large. Moreover, since the hooking surface of the inner receiving claw 38a and the inner locking claw 34a is an acute angle, the inner receiving claw 38a and the inner locking claw 34a are difficult to come off (see FIG. 6B). In addition, since the outer female side extending portion 36b provided with the outer receiving claws 38b is formed thicker than the inner female side extending portion 36a and is difficult to bend, the catching of the outer receiving claws 38b and the outer locking claws 34b is also difficult to come off. . Therefore, even if the inner opening chuck 20 is opened, the outer opening chuck 22 is not opened, and the place where the internal pressure is released from the heating bag 10 during heating can be limited to the pressure release opening 16.

  When the article M is put in and out, the outer claws 38b of the outer chuck 22 are displaced away from the inner hooks 38a by pulling the sheets 12 extending outside the outer chuck 22 away from each other. Since the allowance between the outer catching claw 38b and the outer catching claw 34b is small and the catching surface between the outer catching claw 38b and the outer catching claw 34b is obtuse, the outer catching claw 38b and the outer catching claw 34b (See FIG. 6C). Thus, the outward opening chuck 22 can be easily opened from the outside. Therefore, the heating bag 10 can easily put the article M in and out of the article opening 18 by providing the article opening 18 for taking in and out the article M with the outer opening chuck 22 that can be easily opened from the outside.

  According to the heating bag 10 described above, for example, even when an article M or the like that emits water vapor is stored when a bag or the like is heated, the inner opening chuck 20 is opened due to an increase in the internal pressure of the storage space 14a due to heating, so that the internal pressure is released. The rupture of the heating bag 10 can be prevented. If the inner opening chuck 20 is closed, the heating bag 10 can be used repeatedly. Since the heating bag 10 can control the increase in internal pressure during heating by the inner opening chuck 20, the storage space 14a can be sealed when the chucks 20, 22 are closed, and the heating bag 10 is stored in the storage space 14a. The shelf life of the article M is excellent.

  The inner opening chuck 20 of the claw engagement structure has a simple configuration in which the catches between the inner claws are more easily released than the catches between the outer claws, and can appropriately release the internal pressure increased during heating. It is also possible to divert and use. Therefore, even if the heating bag 10 has a structure for preventing explosion during heating, the cost can be reduced. Moreover, the heating bag 10 can be used repeatedly because the chucks 20 and 22 can be opened and closed, which is economical.

  By making the inner opening chuck 20 shorter than the outer opening chuck 22, it is possible to efficiently apply the pressure increased when heated to the inner opening chuck 20, and to open the inner opening chuck 20 appropriately.

  Since the heating bag 10 includes the required functional layer 26 in addition to the foam layer 24, an appropriate function can be imparted to the sheet 12 by the functional layer 26. For example, the strength of the sheet 12 can be improved by laminating the functional layer 26 made of a film having excellent tear strength on the foam layer 24 having inferior tear strength. Further, by laminating a functional layer 26 such as a non-breathable film on the foam layer 24 having breathability, the sheet 12 has gas barrier properties, and the storage stability of the stored article M is improved. Can do.

  Since the heating bag 10 has the foam layer 24 on the sheet 12, it has excellent heat insulation. Therefore, the article M stored at the time of heating can be efficiently heated, and the heated article M can be hardly cooled. In addition, since the heating bag 10 itself is not easily heated, it is safe to touch after heating.

(Example of change)
For example, the configuration may be changed as follows.
(1) The configuration of the chuck having an orientation that is easy to open is not limited to the embodiment, and other configurations can be adopted. For example, as shown in FIG. 7, in the modified chuck 20 (22), the female-side extending portions 36a and 36b in the female locking receiving portion 30 are respectively perpendicular to the direction perpendicular to the surface of the sheet 12. And may protrude from the sheet 12 so as to be inclined. In FIG. 7, the same components as those in the embodiment are denoted by the same reference numerals as those in the embodiment, and description thereof is omitted.

(2) The configuration may be such that the article opening is also used as the pressure relief opening. In this case, the article can be taken in and out from the pressure release opening, and when opening the pressure release opening, the sheet can be pulled from the inside of the inner opening chuck, or can be opened from the outside with a force larger than the inner opening force of the inner opening chuck. If set to, the inner opening chuck can be opened.
(3) The position of the opening is not limited to the edge of the bag body, and may be provided, for example, in the trunk portion or back pasting portion of the bag body. And what is necessary is just to provide a chuck | zipper corresponding to an opening part.

12 sheets, 14 bag bodies, 16 pressure relief opening (opening),
18 opening for goods (another opening), 20 inner opening chuck, 22 outer opening chuck,
24 foam layer, 26 functional layer, 28 locking portion, 30 locking receiving portion, 34a locking claw,
34b Outer locking claw, 38a Inner claw, 38b Outer claw, M

Claims (6)

A bag body made of a sheet having a foam layer made of a polyolefin-based resin, configured in a bag shape, and capable of storing articles inside,
An inner opening chuck provided to extend to the opening of the bag body, and capable of opening and closing the opening,
The inner opening chuck has an inner opening force required to open the inner opening chuck by applying a force from the inside of the bag body across the inner opening chuck from the outside of the bag body across the inner opening chuck. A heating bag characterized by being configured to be smaller than an outer opening force required when applying force to open the inner opening chuck. The inner opening chuck is
A latching portion having a pair of latching claws protruding in a direction away from each other in the inner and outer directions of the bag body passing through the opening;
A latch receiving portion that has a pair of receiving claws protruding in directions toward each other in the inner and outer directions of the bag main body passing through the opening, and is capable of receiving the locking portion between the pair of receiving claws. ,
The inner opening chuck includes an inner locking claw that protrudes toward the inside of the bag body among the pair of locking claws, and an inner receiving claw that protrudes toward the outside of the bag body among the pair of receiving claws. Of the pair of locking claws and an outer locking claw protruding toward the inside of the bag body, and an outer receiving claw of the pair of receiving claws protruding toward the inside of the bag body Is caught to seal the opening,
2. The heating bag according to claim 1, wherein the inner opening chuck is configured such that a hook between the inner locking claw and the inner receiving claw is more easily disengaged than a hook between the outer locking claw and the outer receiving claw. . Provided to extend to another opening formed in the bag body separately from the opening, and provided with an outer opening chuck capable of opening and closing the other opening,
The outer opening chuck has an outer opening force required to open the outer opening chuck by applying force from the outside of the bag body with the outer opening chuck sandwiched between the inner side of the bag body with the outer opening chuck interposed therebetween. The heating bag according to claim 1 or 2, wherein the heating bag is configured to be smaller than an inner opening force required to open the outer opening chuck by applying a force. The inner opening chuck and the outer opening chuck are provided so as to extend over the entire opening to be opened and closed,
The heating bag according to claim 3, wherein the inner opening chuck has an extension length shorter than that of the outer opening chuck.   The heating according to any one of claims 1 to 4, wherein the sheet has a laminated structure including a functional layer selected from solid type synthetic resin and paper in addition to the foam layer. Bags. The foam layer has a cell diameter of 50 μm to 300 μm, a density of 40 kg / m ^{3 to} 60 kg / m ³ , and a thermal conductivity of 0.026 w / (m · k) to 0.040 w / (m · k). The heating bag according to any one of claims 1 to 5, comprising a foam having an open-cell structure.

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