JP2020200082A - Steam penetrative pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steamable pouch capable of linearly and beautifully tearing an opened portion by hand or the like and easily taking out the contents. SOLUTION: The body member sheet 20 and the bottom member sheet are opposed to each other, and the peripheral edges of the left side surface, the right side surface and the bottom surface are sealed, and the upper surface is hermetically sealed after being filled with the contents 15. A storage space 11 for accommodating the contents is provided, and at least one of the seal portions on the left and right sides has a steaming portion 60 for releasing steam in the accommodating space during heating, and a bottom surface side or an upper surface side of the steaming portion. A steam-permeable pouch 10 including an opening portion 50 substantially parallel to the bottom surface, wherein the body member sheet and the bottom member sheet each include at least an outermost layer and a sealant layer, and the sealant layer of the body member sheet includes at least an outermost layer and a sealant layer. The sealant layer of the bottom member sheet is a steam-permeable pouch made of a material having excellent heat resistance and easy tearing property in the width direction, and having excellent heat resistance and bottom opening property. .. [Selection diagram] Fig. 1

Description

The present invention relates to a steamable pouch that can be easily torn by hand or the like and can also be used as a container for eating after opening.

Microwave pouches for storing heated contents, such as retort pouches and frozen foods, are widely used. When this pouch is heated in a microwave oven, the water contained in the contents evaporates as the pouch is heated, and the pressure inside the pouch increases. If the pressure inside the pouch increases, the pouch may break and the contents may scatter and stain the inside of the microwave oven. Therefore, a steaming type pouch having a steam venting mechanism is known in order to release the pressure inside the pouch that has increased due to heating to the outside.

The steamable pouch has a sheet sealed so as to form a storage space that can accommodate the contents, and a steaming part in which a part of the sheet is sealed so as to open as the pressure of the storage space increases. including. When the pressure in the accommodating space rises to a certain extent due to heating, the seal constituting the steaming portion is peeled off, and a passage connecting the accommodating space and the external space is formed in the permeating portion. Therefore, the moisture in the accommodation space is discharged to the outside of the pouch through the passage formed in the steam passage portion, and the increase in the pressure in the accommodation space is suppressed.

Patent Document 1 discloses a pouch for a microwave oven, which is an example of a conventional steaming type pouch. This microwave oven pouch includes a laminated sheet as shown in Patent Document 1. The laminated sheet includes a base material layer, a printing layer, another layer, and a sealant layer. When the heating of the microwave oven pouch containing the contents is completed by the heating means, the laminated sheet is torn from the opened portion and the contents are taken out from the storage space.

JP-A-2018-127257

However, in the microwave oven pouch described in Patent Document 1, when the laminated sheet is torn from the opened portion by hand or the like, the innermost sealant layer extends in the middle of the tearing, and the innermost sealant layer does not tear linearly or tears. There is a problem that a sufficient opening cannot be obtained and the contents cannot be easily taken out from the opened portion due to the occurrence of feathering or wavy deformation in the place.

The present invention has been made in view of the above problems, and is a steam-permeable pouch in which the opened portion can be torn linearly and neatly by hand or the like, and the contents can be easily taken out. An object is to provide a steamed pouch.

According to claim 1 of the present invention, the body member sheet is composed of an opposing body member sheet and a bottom member sheet that is folded into the bottom surface.
By sealing the peripheral edges of the left side surface, the right side surface, and the bottom surface, and further sealing the upper surface after filling the contents, a storage space for accommodating the contents is provided.
At least one of the seal portions on the left and right sides is provided with a steaming portion for allowing steam in the accommodation space to escape during heating, and an opening portion on the bottom surface side or the upper surface side of the steaming portion that is substantially parallel to the bottom surface. It ’s a steamed pouch,
The body member sheet and the bottom member sheet each include at least an outermost layer and a sealant layer, respectively.
The sealant layer of the body member sheet is made of a material having excellent heat resistance and easy tearability in the width direction.
The sealant layer of the bottom member sheet is made of a material having excellent heat resistance and bottom opening property.

When the steaming type pouch is heated while the contents are housed in the storage space, a passage connecting the storage space and the external space is formed in the steaming part as the pressure in the storage space increases. Therefore, the water vapor in the accommodation space passes through the passage formed in the steaming portion and is discharged to the outside of the steaming type pouch, and the increase in the pressure in the accommodation space is suppressed. Further, since the sealant layer of the body member sheet is made of a material having a tearability in the width direction, the sheet can be easily torn in the width direction. Therefore, the contents can be easily taken out from the torn portion of the body member sheet. Further, since the sealant layer of the bottom member sheet is made of a material having an appropriate waist and having a bottom opening property, it is possible to ensure filling suitability as a container.

Further, according to claim 2 of the present invention, the sealant layer of the body member sheet contains 3 to 10 parts by weight of a low crystallinity ethylene-based elastomer with respect to 100 parts by weight of the propylene / ethylene block copolymer. The low crystalline ethylene-based elastomer has a density in the range of 0.865 to 0.890 g / cm ³ , and has a heat absorption amount at the time of melting specified in JIS standard 7122 in the range of 5 to 30 J / g. The sealant layer of the bottom member sheet is made of unstretched polypropylene. Polypropylene is a resin having excellent heat resistance, and can be suitably used as a material for a pouch for a microwave oven, which requires boil / retort suitability.

Further, the sealant layer of the body member sheet has a tearability in the width direction, and the sheet can be easily torn in the width direction. In addition, a short filamentous whiskers may remain in the torn portion, but this phenomenon is rarely seen with polypropylene. Therefore, the contents can be easily taken out from the torn portion of the sheet.

The sealant layer of the bottom member sheet is made of unstretched polypropylene. Unstretched polypropylene is a film that is molded without stretching the polypropylene material. It stretches when pulled, so it is not easily torn and is not suitable for body members, but it is flexible and has bottom opening properties, so it is suitable for filling and is pulled. But it's hard to tear.

Further, according to claim 3 of the present invention, both or at least one of the body member sheet and the bottom member sheet further includes an intermediate layer laminated between the outermost layer and the sealant layer. Therefore, the strength of the steamable pouch is increased.

Further, according to claim 4 of the present invention, the intermediate layer is made of a material having excellent heat resistance and easy tearability in the width direction. Since the intermediate layer is made of a material having excellent tearability in the width direction, the sheet can be easily torn. Therefore, the contents can be easily taken out from the torn portion of the sheet.

Further, according to claim 5, the opening portion has a notch in at least one of the left and right side sealing portions, and the sheet is cut from the right end of the left side sealing portion to the left end of the right side sealing portion. A guide section for guiding is further provided. According to the steaming pouch, the notch is used as a tearing start point, and the sheet can be easily torn along the guide portion. Therefore, the contents can be easily taken out from the torn portion of the sheet.

Further, according to claim 6 of the present invention, the guide portion includes a cut line provided in the intermediate layer. According to the steamable pouch, the sheet can be easily torn even when the intermediate layer is provided. Therefore, the contents can be easily taken out from the torn portion of the sheet.

According to the steamable pouch according to the present invention, the opened portion can be torn linearly and neatly by hand or the like, and the contents can be easily taken out.

The front view of the steaming type pouch which shows an example of embodiment of this invention. The cross-sectional view which shows the layer structure of the body member sheet and the bottom member sheet. Enlarged view of the open steamed part and its surroundings. Front view of the steamable pouch in the opened state.

Hereinafter, an example of the embodiment of the present invention will be described. FIG. 1 shows an example of a steaming type pouch 10 capable of accommodating a content 15 suitable for heating and discharging steam generated from the content 15. The content 15 is a heated object that generates water vapor when heated. An example of the content 15 is food. An example of food is a fluid food such as stew and soup. The steamable pouch 10 is configured to be able to be stored for a long period of time while maintaining the quality of the content 15. Examples of shapes that the steamable pouch 10 can take are self-supporting types such as a standing type and a gusset type. The shape of the steamable pouch 10 illustrated in FIG. 1 is a standing type. Hereinafter, the left-right direction of the steam-permeating pouch 10 in the front view of the steam-permeating pouch 10 is referred to as a standard width direction, and the direction orthogonal to the standard width direction is referred to as a standard height direction.

The steaming type pouch 10 includes a body member sheet 20, a bottom member sheet 23, a top surface sealing portion 31, a bottom surface sealing portion 32, a right side surface sealing portion 33, a left side surface sealing portion 34, an opening portion 50, and a steaming portion 60. The body member sheet 20 includes a front sheet 21 and a back sheet 22. The front seat 21 and the back seat 22 face each other so that a storage space 11 for accommodating the content 15 is formed between the seats 21 and 22. The bottom member sheet 23 is folded around and sealed so as to close between the bottom of the front sheet 21 and the bottom of the back sheet 22.

The body member sheet 20 (21, 22) and the bottom member sheet 23 have a layer structure in which a plurality of layers are laminated. FIG. 2A is a cross-sectional view showing a layer structure of a body member sheet, and FIG. 2B is a cross-sectional view showing a layer structure of a bottom member sheet. The body member sheet 20 (21, 22) includes an outermost layer 20A, an intermediate layer 20B, a sealant layer 20C, a first adhesive layer 20D, and a second adhesive layer 20E. Similarly, the bottom member sheet 23 includes an outermost layer 23A, an intermediate layer 23B, a sealant layer 23C, a first adhesive layer 23D, and a second adhesive layer 23E. An example of a method for producing each of the sheets 21 to 23 is dry lamination. The first adhesive layer of each sheet 21 to 23 is provided between the outermost layer and the intermediate layer, and the second adhesive layer is provided between the intermediate layer and the sealant layer.

The outermost layer 20A of the body member sheet 20 (21, 22) is mainly excellent in gas blocking property, printability, and heat resistance. The outermost layer 20A is, for example, a transparent thin-film deposition layer. An example of the material constituting the outermost layer 20A is polyethylene terephthalate (hereinafter referred to as "deposited PET") on which an inorganic thin film is deposited. The intermediate layer 20B is mainly excellent in heat resistance and moisture resistance. The material constituting the intermediate layer 20B is nylon having a tearability in the width direction of the body member sheet 20 (hereinafter, below).
It is called "easy-to-cut Ny"). Hereinafter, the orientation direction of the materials constituting the sheets 21 and 22 is referred to as an MD (Machine Direction) direction, and the direction orthogonal to the MD direction is referred to as a TD (Transverse Direction) direction. The MD direction of each of the sheets 21 and 22 is a direction along the standard width direction. The TD direction of each of the sheets 21 and 22 is a direction along the standard height direction. An example of the material constituting the first adhesive layer 20D is a polyester-based adhesive. An example of the material constituting the second adhesive layer 20E is a polyester-based adhesive.

Regarding the bottom member sheet 23, the outermost layer 23A is made of the same material as the outermost layer 20A of the body member sheet 20, but an example of the material of the intermediate layer 23B is unstretched nylon which is not easily cut.

The sealant layer 20C of the body member sheet 20 is excellent in heat resistance, heat sealability, and impact resistance. An example of the material constituting the sealant layer 20C is unstretched polypropylene having excellent tearability in the MD direction (hereinafter, referred to as “easy-cutting CPP”).

The excellent tearability in the MD direction means, for example, a case where the tearing force according to the trouser tearing method specified in JIS standard K71281-1 is 1.2N or less. In the trouser tearing method, a 75 mm notch is made in the center of a rectangular test piece having a length of 50 mm in the TD direction and a length of 150 mm in the MD direction, and in a constant temperature room at 23 ° C., a notch is made in the MD direction at a speed of 200 mm / min. The tearing force was measured.

The easily cut CPP contains, for example, 3 to 10 parts by weight of a low crystallinity ethylene-based elastomer with respect to 100 parts by weight of the propylene / ethylene block copolymer. The low crystalline ethylene-based elastomer is contained in, for example, a density of 0.865 to 0.890 g / cm ³ , and has a heat absorption amount of 5 to 30 J / g at the time of melting specified in JIS standard 7122. include.

The sealant layer 23C of the bottom member sheet 23 is excellent in heat resistance, heat sealability, and flexibility, and has bottom opening suitability. Further, it is a non-stretched film, has a property of stretching when pulled, and has no easy-to-cut property.

Each of the seal portions 31 to 34 shown in FIG. 1 joins the sheets 21 to 23 so that the sheets 21 to 23 are not separated. An example of a method for forming the seal portions 31 to 34 is a heat seal. The outer shape of the steam-permeable pouch 10 in the front view can be arbitrarily selected. In the example shown in FIG. 1, the outer shape of the steamable pouch is rectangular.

The opening portion 50 has a notch 51 on at least one of the left and right side sealing portions, and is at the same height as the notch 51 in the standard height direction, from the right end of the left side sealing portion to the left end of the right side sealing portion. A guide portion 52 for guiding the cutting of the sheet 20 is provided on the body member sheet 20. The position of the opening portion 50 (notch 51, guide portion 52) can be arbitrarily selected in the standard height direction. In the example shown in FIG. 1, the opening portion 50 is provided between the steaming portion 60 and the bottom member sheet 23 in the standard height direction. In a preferred example, it is provided at a position closer to the steaming portion 60 than the bottom member sheet 23 in the standard height direction. In yet another example, the opening portion 50 is provided between the steaming portion 60 and the top surface sealing portion 31 in the standard height direction.

The guide portion 52 is a set of perforations formed on the body member sheet 20, and is formed along the MD direction of the body member sheet 20. The notch 51 is formed on at least one of the right side seal portion 33 and the left side seal portion 34 so that the tip portion of the notch 51 is located on the virtual line extending the guide portion 52. FIG. 1 shows an example in which a notch 51 is formed in the left side surface sealing portion 34.

The opening portion 50 in which the guide portion 52 is formed has a lower tear strength than the other portions of the body member sheet 20 in which the guide portion 52 is not formed. Therefore, when a force is applied to the opening portion 50 in the direction along the guide portion 52, the body member sheet 20 is easily torn along the guide portion 52. The guide portion 52 includes a plurality of notches 52A formed discontinuously in the standard width direction. The means for forming the guide portion 52 is, for example, a perforation machine.

The shape of the notch 52A may be linear, curved, perforated, broken line, or the like, and the number thereof may be one or more in the standard height direction. In the present invention, the notch 52A portion May weaken and act as a break in the opening 50.

In a preferred example, the notch 52A does not penetrate all three layers of the outermost layer 20A, the intermediate layer 20B, and the sealant layer 20C constituting the body member sheet 20, and one or two of the three layers. Is formed in. Since the notch 52A does not penetrate the three layers of the body member sheet 20, the contents 15 accommodated in the accommodation space 11 do not pass to the outside from the guide portion 52. In the present embodiment, the notch 52A is provided so as to penetrate only the intermediate layer 20B of the body member sheet 20.

The steamable pouch 10 is heated by a heating means to heat the content 15. An example of a heating means is a microwave oven. As the steaming type pouch 10 is heated, water vapor is generated from the content 15. The pressure in the accommodation space 11 increases with the generation of water vapor. The steaming section 60 is configured to open as the pressure in the accommodating space 11 increases so that the water vapor in the accommodating space 11 can be discharged to the outside of the steaming type pouch 10. In a preferred example, the steaming section 60 is configured to open when the pressure in the accommodation space 11 rises to a pressure within a predetermined pressure range.

The steaming section 60 can take various forms. In one example, the steaming portion 60 is provided on at least one of the right side sealing portion 33 and the left side sealing portion 34. In another example, the steaming portion 60 is provided inside the sealing portion independently of the right side sealing portion 33 and the left side sealing portion 34. FIG. 1 shows an example provided only on the right side seal portion 33.

The shape of the steaming portion 60 is a shape that is recessed from the outside to the inside in the standard width direction. The tip portion 61, which is the innermost portion in the standard width direction of the steaming portion 60, is provided at a place where strong stress concentration occurs when the pressure in the accommodation space 11 of the body member sheet 20 increases. It opens when the pressure in the accommodation space 11 rises to a pressure within a predetermined pressure range.

Specifically, as the pressure in the accommodation space 11 increases, the front sheet 21 and the back sheet 22 joined at the tip 61 of the steaming portion 60 are separated from each other, and as shown in FIG. A steam vent passage 62 that communicates with the outside of the steaming type pouch 10 is formed in the steaming portion 60. The range in which the steaming portion 60 is peeled off differs depending on the magnitude of the pressure in the accommodation space 11. When the pressure in the accommodation space 11 is high, the peeling may proceed to the root portion of the steaming portion 60. The passage area of the steam vent passage 62 becomes wider as the peeling of the steam passage portion 60 progresses. When the steaming section 60 is opened, the steam in the accommodation space 11 passes through the steam vent passage 62 and is discharged to the outside of the steaming type pouch 10. By discharging the water vapor, the increase in the pressure in the accommodation space 11 is suppressed, and the bag breakage of the steaming type pouch 10 is avoided.

FIG. 4 shows a steaming type pouch 10 in which the opening portion 50 is opened after cooking. When the opening portion 50 is opened, the body member sheet 20 is torn from the tip of the notch 51, and a force is applied to the body member sheet 20 so that the tearing of the body member sheet 20 proceeds along the guide portion 52 to open the opening. The entire part 50 is opened. The user can eat the contents 15 by using the steaming type pouch 10 opened from the opening portion 50 as a container.

Using the samples of Examples and Comparative Examples, a test was conducted to confirm the relationship between the layer structure of the body member sheet 20 and the bottom member sheet 23, and the tearability and bottom opening property. The sample is a retort pouch and the contents are curry. After cooking the sample in a 600 W microwave oven for 1 minute, the tearability (hereinafter referred to as “cutting property”) and bottom opening property when the body member sheet 20 was torn were sensory evaluated by a five-step scoring method. "5: Good> 4: Somewhat good> 3: Normal> 2: Somewhat bad> 1: Bad". Table 1 shows the scoring results of the layer structure, cutability, and bottom opening property of the sample.

The meanings of the terms related to the materials shown in Table 1 are as follows.

<Transparent thin-film PET12>
A transparent vapor-deposited film in which aluminum oxide is deposited on a polyethylene terephthalate film (thickness 12 μm).
<Easy cut PET12>
A polyethylene terephthalate film (thickness 12 μm) with excellent tearability in the MD direction. The excellent tearability in the MD direction means, for example, a case where the tearing force according to the trouser tearing method specified in JIS standard K71281-1 is 1.2N or less.
<Easy cut CPP60>
The low crystalline ethylene-based elastomer contains 3 to 10 parts by weight with respect to 100 parts by weight of the propylene / ethylene block copolymer, and the density of the low-crystalline ethylene-based elastomer is 0.865 to 0.890 g / cm3. An unstretched polypropylene film (thickness 60 μm) that is included in the range of 5 to 30 J / g and has a heat absorption amount at the time of melting specified in JIS standard 7122.
<Easy cut Ny15>
Polyamide film (thickness 15 μm) with excellent tearability in the MD direction.
<PET12>
A polyethylene terephthalate film (thickness 12 μm) that does not have excellent tearability in the MD direction. The term "not excellent in tearability in the MD direction" means, for example, a case where the tearing force according to the trouser tearing method specified in JIS standard K7121-1 is more than 1.2N.
<CPP60>
A non-stretched polypropylene film (thickness 60 μm) that does not have excellent tearability in the MD direction.
<Ny15>
Polyamide film (thickness 15 μm) that does not have excellent tearability in the MD direction.

As can be seen from Table 1, when the sealant layer of the body member sheet is composed of easy-to-cut CPP and the sealant layer of the bottom member is composed of CPP, it has the best cutability and bottom opening suitability. It becomes a steamed pouch.

From the above, according to the steamable pouch of the present invention, the following actions and effects can be obtained. When the contents are housed in the storage space and the closed steaming pouch is heated, a steam vent passage connecting the storage space and the outside is formed in the steaming part as the pressure in the storage space increases. Therefore, the water vapor in the accommodation space passes through the steam vent passage and is discharged to the outside of the steaming type pouch, and the increase in the pressure in the accommodation space is suppressed.

Further, since the sealant layer of the body member sheet is made of a material having excellent tearability in the MD direction, the body member sheet can be easily torn by hand from the opened portion. Therefore, the contents can be easily taken out from the opening. In addition, the sealant layer of the bottom member sheet is M.
Since it is made of a material that is not excellent in tearability in the D direction, it is flexible and has bottom opening property, so that it is possible to provide a steamable pouch having filling suitability.

10 ... Steamable pouch 11 ... Storage space 15 ... Contents 20 ... Body member sheet 20A ... Body member sheet outermost layer 20B ... Body member sheet intermediate layer 20C ... Body Member sheet Sealant layer 20D ... First adhesive layer 20E of the body member sheet ... Second adhesive layer 21 of the body member sheet ... Front sheet 22 ... Back sheet 23 ... Bottom member sheet 23A ... -Bottom member sheet outermost layer 23B ... Bottom member sheet intermediate layer 23C ... Bottom member sheet sealant layer 23D ... Bottom member sheet first adhesive layer 23E ... Bottom member sheet second adhesive layer 31.・ ・ Top surface seal part 32 ・ ・ ・ Bottom surface seal part 33 ・ ・ ・ Right side surface seal part 34 ・ ・ ・ Left side surface seal part 50 ・ ・ ・ Opening part 51 ・ ・ ・ Notch 52 ・ ・ ・ Guide part 52A ・ ・ ・ Cut 60 ... Steaming part 61 ... Tip of the steaming part 62 ... Steam vent passage

Claims (6)

It consists of a body member sheet facing each other and a bottom member sheet folded into the bottom surface.
By sealing the peripheral edges of the left side surface, the right side surface, and the bottom surface, and further sealing the upper surface after filling the contents, a storage space for accommodating the contents is provided.
At least one of the seal portions on the left and right sides is provided with a steaming portion for allowing steam in the accommodation space to escape during heating, and an opening portion on the bottom surface side or the upper surface side of the steaming portion that is substantially parallel to the bottom surface. It ’s a steamed pouch,
The body member sheet and the bottom member sheet each include at least an outermost layer and a sealant layer, respectively.
The sealant layer of the body member sheet is made of a material having excellent heat resistance and easy tearability in the width direction.
The sealant layer of the bottom member sheet is a steamable pouch made of a material having excellent heat resistance and bottom opening property. The sealant layer of the body member sheet contains 3 to 10 parts by weight of a low crystalline ethylene-based elastomer with respect to 100 parts by weight of the propylene / ethylene block copolymer, and the density of the low crystalline ethylene-based elastomer is high. It is made of unstretched polypropylene contained in the range of 0.865 to 0.890 g / cm ³ and having a heat absorption amount at the time of melting specified in JIS standard 7122 in the range of 5 to 30 J / g. The steamable pouch according to claim 1, wherein the sealant layer of the material sheet is made of unstretched polypropylene. The steamable pouch according to claim 1 or 2, wherein both or at least one of the body member sheet and the bottom member sheet further includes an intermediate layer laminated between the outermost layer and the sealant layer. The steamable pouch according to claim 3, wherein the intermediate layer is made of a material having excellent heat resistance and easy tearability in the width direction. The opening portion has a notch in at least one of the seal portions on the left and right side surfaces, and further includes a guide portion for guiding the cutting of the sheet from the right end of the left side seal portion to the left end of the right side seal portion. The steamable pouch according to any one of 4 to 4. The steam-permeable pouch according to claim 5, wherein the guide portion includes a cut line provided in the intermediate layer, which cites claim 3 or 4.

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