JP7176251B2 - pouch - Google Patents

Description

TECHNICAL FIELD The present invention relates to a pouch having two compartments and capable of being cooked.

2. Description of the Related Art Conventionally, packaging bodies such as bags and containers have been known that can be heated and cooked in a microwave oven while food is contained in the container. Also, a packaging bag has been developed in which the storage part is divided into two or more parts and the contents stored in each part are mixed and cooked (see Patent Documents 1 and 2).

JP 2004-284604 A JP-A-2005-350066

However, in conventional packaging bags, it is difficult to accommodate relatively long contents in either of the two compartments.

Accordingly, an object of the present invention is to provide a pouch having two storage portions and a vapor release function, in which the length of one storage portion can be increased.

In order to solve the above problems, the present invention
A pouch formed from a packaging material comprising at least a first stretched plastic film and a sealant film, the pouch having a front surface and a back surface,
having a top edge, a bottom edge opposite the top edge, first and second side edges extending between the top and bottom edges;
Equipped with a joint on the front side,
The palm-to-palm portion is provided from the first side edge to the second side edge,
Having a sealing portion that joins the inner surface of the packaging material,
The seal portion comprises an outer edge seal portion for forming a housing portion, a palm-to-palm seal portion provided on the palm-to-palm portion, a steam release seal portion that separates due to an increase in pressure in the housing portion, and the housing portion. including a partition seal for dividing into two,
The steam release seal portion is provided at the palm-to-palm portion,
The partition seal portion is provided in the region of the palm-to-palm portion,
The accommodation portion includes a first accommodation portion extending between an upper seal portion extending along the upper edge and a first bottom seal portion extending along the lower edge, and extending along the tips of the partition seal portion and the palm-to-palm portion. and a second accommodation portion extending between the first joint seal portions,
To provide a pouch characterized by:

In the pouch of the present invention, the pouch comprises a front film, a back film facing the front film, and a first position on the upper edge side of the front film and the back film. and an intermediate film, and a seal strength between the front film and the first intermediate film at 100° C. may be 23 N or less.

Further, in the pouch of the present invention, the seal strength of the seal portion between the front film and the first intermediate film at 25° C. may be 60 N or less.

Further, in the pouch of the present invention, in the front film and the first intermediate film, the tensile elastic modulus (MPa) of the sealant film in the first direction, which is the direction from the upper edge to the lower edge of the pouch, A product of thicknesses (μm) of the sealant film may be 35000 or more.

Further, in the pouch of the present invention, the sealant film may contain a propylene/ethylene block copolymer as a main component.

In the pouch of the present invention, the sealant film may contain a propylene/ethylene block copolymer and an α-olefin copolymer as main components.

Also, the pouch of the present invention may further have a bottom gusset.

Moreover, the pouch of the present invention may contain a first content in the first container.

Further, in the pouch of the present invention, the second content may be accommodated in the second accommodation portion, and the first content and the second content may be different.

According to the present invention, since the first containing part extends between the top sealing part and the first bottom sealing part, the first content is a single solid object and can be can be accommodated even if it is longer than the length of

It is a front view showing a pouch according to one embodiment of the present invention. 1 is a rear view showing a pouch according to one embodiment of the present invention; FIG. 2 is a cross-sectional view corresponding to line AA shown in FIG. 1; FIG. FIG. 2 is a cross-sectional view showing an example of the layer structure of a packaging material; 1 is a front view showing a sealed pouch containing contents; FIG. FIG. 4 is a rear view showing a sealed pouch containing contents; It is a figure which shows the mode of the tensile test by a tensile tester. FIG. 10 is a front view of a variation of a pouch without bottom gussets; FIG. 11 is a rear view showing a pouch according to a modification provided with an opening/closing mechanism; FIG. 10 is a cross-sectional view corresponding to line BB shown in FIG. 9;

Preferred embodiments of the present invention will now be described in detail with reference to the drawings.
FIG. 1 is a front view showing a pouch according to one embodiment of the invention. Moreover, FIG. 2 is a rear view which shows the pouch which concerns on one Embodiment of this invention. 3 is a cross-sectional view corresponding to line AA shown in FIG. The pouch of the present embodiment shown in FIGS. 1 to 3 shows the pouch in a state before being filled with the content (state in which the content is not filled). The pouch of this embodiment has a front surface 1, a back surface 2, a first intermediate surface 3, and a second intermediate surface 4. It has a rectangular shape in rear view. In the present embodiment, the concept of a rectangle includes not only a rectangle with four right-angled corners, but also a rectangle with its four corners chamfered to form an outwardly convex arc or curve. In addition, "intermediate" in the first intermediate surface 3 and the second intermediate surface 4 means that it is located between the front surface 1 and the back surface 2, and does not mean that the position or the like is particularly limited. In the present invention, the concept of pouches includes not only pouches that are not filled with contents, but also pouches that are filled with contents.

The pouch of this embodiment has a top edge 16, a bottom edge 17 opposite top edge 16, and a first side edge 18 and a second side edge 19 extending between top edge 16 and bottom edge 17. . A palm-to-palm portion 7 is provided from the first side edge 18 to the second side edge 19 . In order to allow the pouch to stand on its own, a bottom gusset portion 9 is formed below where the front surface 1 and the back surface 2 are overlapped with the second intermediate surface 4 respectively. When the bottom gusset portion 9 is utilized to make the pouch stand on its own, the first intermediate surface 3 serves as the top surface and the second intermediate surface 4 serves as the bottom surface. In this specification, the y-direction shown in FIG. 1 (vertical direction in FIG. 1) is defined as the first direction, and the x-direction shown in FIG. 1 (horizontal direction in FIG. 1) is defined as the second direction. In this specification, "front surface", "back surface", "upper edge", "lower edge", "first side edge", "second side edge", "bottom surface", "upper surface", etc. For convenience of explanation, the terminology representing the positional relationship of is merely indicative of a relative positional relationship, and in interpreting the technical scope, it should not be construed as being limited to these terms.

<Constituent member>
The pouch of this embodiment, as shown in the cross-sectional view of FIG. These members are realized by a front film, a back film, a first intermediate film, and a second intermediate film, which are packaging materials, respectively. The front surface 1 and the back surface 2 are arranged with their inner surfaces facing each other. In addition, the first intermediate surface 3 has two folded inner surfaces facing the inner surfaces of the front surface 1 and the back surface 2, and on the side of the upper edge 16, between the front surface 1 and the back surface 2. are placed. Then, the second intermediate surface 4 has two inner surfaces folded back at the folded portion 4a so as to face the inner surfaces of the front surface 1 and the back surface 2, and the front surface 1 and the back surface on the lower edge 17 side. placed between 2. Furthermore, one folded surface of the first intermediate surface 3 and the front surface 1 are overlapped to form a palm-joint portion 7 . The palm-to-palm portion 7 has an end edge facing the lower edge 17 of the front surface 1 and an end edge of the first intermediate surface 3 as a tip 7a, and a folded portion of the first intermediate surface 3 as a base portion 7b. It is formed by overlapping up to the base 7b.

<Seal part>
The pouch of this embodiment shown in FIGS. 1 and 2 shows a state before being filled with contents. As shown in FIGS. 1 and 2, the pouch of this embodiment before being filled with contents has a first side sealing portion 5a, a second side sealing portion 5b, a first bottom sealing portion 6a, and a second side sealing portion 6a. A second bottom seal portion 6b, a third bottom seal portion 6c, a joint seal portion (a first joint seal portion 7c, a second joint seal portion 7d), a steam release seal portion 7e, and a partition seal portion 8 are provided. ing. In FIGS. 1 and 2, the heat-sealed and formed seal portions are shaded with oblique lines. The unformed sealing portion is not shaded, and its boundary is indicated by a chain double-dashed line. The first side seal portion 5a and the second side seal portion 5b are formed by sealing the inner surfaces of the front surface 1 and the back surface 2 and joining them. The first side seal portion 5a is formed to include a first side edge 18 (the left end in FIG. 1 and the right end in FIG. 2), and the second side seal portion 5b is formed to include a second side edge 19 (the left end in FIG. 2). 1, and the left end in FIG. 2).

The bottom seal portion 6 is a seal portion formed below the folded portion 4a, and is composed of a first bottom seal portion 6a, a second bottom seal portion 6b, and a third bottom seal portion 6c. The first bottom seal portion 6a, the second bottom seal portion 6b, and the third bottom seal portion 6c seal the inner surfaces of the front surface 1 and the second intermediate surface 4, and the inner surfaces of the back surface 2 and the second intermediate surface 4. It is a seal portion that is joined by being pressed. The first bottom seal portion 6a is formed to include a lower edge 17 from a first side edge 18 to a second side edge 19 . The second bottom sealing portion 6b is formed obliquely from the intersection of the first side edge 18 and the folded portion 4a and the intersection of the second side edge 19 and the folded portion 4a to the lower edge 17. As shown in FIG. The third bottom seal portion 6 c is formed along the first side edge 18 and the second side edge 19 to the lower edge 17 . In the third bottom sealing portion 6c, a notch is provided in a part of the packaging material that will become the second intermediate surface 4, and the inner surfaces of the packaging material that will become the front surface 1 and the packaging material that will become the back surface 2 will be directly sealed. The pouch can be made self-supporting by joining them together. In this embodiment, the seal widths of the first side seal portion 5a, the second side seal portion 5b, the first bottom seal portion 6a, the second bottom seal portion 6b, and the third bottom seal portion 6c are all equal, and W1 is be. The seal width is the width in the direction orthogonal to the extending direction of the seal portion. Of course, these seal widths may differ from each other.

As shown in FIG. 1, the palm-joint seal portion is a seal portion formed by sealing and joining the inner surfaces of the front surface 1 and the first intermediate surface 3 in the palm-joint portion 7, and includes a first palm-joint seal portion 7c, It is composed of the second joint seal portion 7d. The first palm-joint seal portion 7 c is a seal portion formed along the tip 7 a of the palm-joint portion 7 . The second palm-joint seal portion 7d is a seal portion formed at a portion of the palm-joint portion 7 that overlaps with the first side seal portion 5a and the second side seal portion 5b. The steam release seal portion 7e is a seal portion that seals and joins the inner surfaces of the front surface 1 and the first intermediate surface 3 at the joint portion 7, and is attached to the second joint seal portion 7d so as to sandwich the unsealed portion 7f. It is a seal portion formed continuously. The unsealed portion 7f is a portion that is not sealed, and the inner surfaces of the front surface 1 and the first intermediate surface 3 are not joined together in the unsealed portion 7f. In the present embodiment, the seal widths of the first joint seal portion 7c and the second joint seal portion 7d are the same as the first side seal portion 5a, the second side seal portion 5b, the first bottom seal portion 6a, and the second seal width. Like the bottom seal portion 6b and the third bottom seal portion 6c, it is W1.

A steam release mechanism is formed by the steam release sealed portion 7e and the unsealed portion 7f. A vapor release mechanism may be provided between the upper edge 16 of the pouch and the partition seal 8 . The unsealed portion 7 f is formed to reach the second side edge 19 , and an opening 7 g is formed between the front surface 1 and the first intermediate surface 3 at the second side edge 19 . In this embodiment, the unsealed portion 7f has a substantially rectangular shape, and one side of the unsealed portion 7f is positioned at the second side edge 19 where the opening 7g exists. The unsealed portion 7f opens the steam inside the pouch after the communication between the first storage portion 11a and the second storage portion 11b when the pressure inside the pouch increases due to the steam generated by the heating by the microwave oven. It is provided to escape from 7g to the outside. The unsealed portion 7f of the present embodiment is composed of the front surface 1 and the first intermediate surface 3, which are not heat-sealed but overlapped. Therefore, the unsealed portion 7f is formed with an opening 7g defined by the edges of the superimposed front surface 1 and first intermediate surface 3. As shown in FIG.

The steam release seal portion 7e is a seal portion that is heat-sealed to separate the unsealed portion 7f and the second accommodation portion 11b. 7d and the second joint seal portion 7d below the lower end of the unsealed portion 7f are connected. The seal width W2 of the steam release seal portion 7e is smaller than the seal width W1 of the second palm-to-palm seal portion 7d. The seal width W2 of the steam release seal portion 7e is preferably 2.5 mm or more and 5 mm or less. The inner edge of the steam release seal portion 7e protrudes from the inner edge of the second joint seal portion 7d toward the second housing portion 11b, and the outer edge of the steam release seal portion 7e forms a boundary with the unsealed portion 7f. .

In the example shown in FIG. 1, the distance L1 from the inner edge of the second joining seal portion 7d to the inner edge of the steam release seal portion 7e in the direction perpendicular to the direction in which the second joining seal portion 7d extends is 3 mm or more and 15 mm or less. , and more preferably 6 mm or more and 12 mm or less. By setting the distance L1 to 3 mm or more, it is possible to prevent the seal portions other than the steam release seal portion 7e from retreating, so that the steam can be stably released from the steam release mechanism. Also, by setting the distance L1 to 15 mm or less, it is possible to facilitate filling of the contents. In the example of FIG. 1, the seal widths of the second joint seal portion 7d below the lower end of the unsealed portion 7f and the second joint seal portion 7d above the upper end of the unsealed portion 7f are both W1 and are the same. However, even if the seal width of the second palm-joint seal portion 7d below the lower end of the unsealed portion 7f is made smaller than the seal width of the second joint seal portion 7d above the upper end of the unsealed portion 7f good.

The partition seal portion 8 is provided in the region of the joint portion 7 . Specifically, it is provided in a region between the base portion 7 b of the palm-joining portion 7 and the tip 7 a of the palm-joining portion 7 . With the partition seal portion 8 , the accommodation portion 11 is divided into a first accommodation portion 11 a extending between the upper seal portion 10 near the upper edge 16 and the first bottom seal portion 6 a and the second bottom seal portion 6 b , and the partition seal portion 8 . It is divided into a second accommodation portion 11b extending between the tips 7a of the joint portion 7. As shown in FIG. In this embodiment, the partition seal portion 8 is formed in a wavy line shape. However, the shape of the partition seal portion 8 is not limited to a wavy line shape. For example, it may be linear. The seal width of the partition seal portion 8 is W3. The seal width of the partition seal portion 8 means the width of its narrowest portion when it is wavy as in the present embodiment. As will be described later, since the partition seal portion 8 receives forces from two directions, the width W3 of the partition seal portion 8 may be equal to or larger than the width of the other seal portions. Width W2 of steam release seal portion 7e defining housing portion 11 and outer edge seal portions (first side seal portion 5a, second side seal portion 5b, first bottom seal portion 6a, second bottom seal portion 6b, It is preferably smaller than the width W1 of the first joint seal portion 7c). This is because the partition seal portion 8 is more likely to peel off than the other seal portions.

As shown in FIGS. 1 and 2 without shading, the boundary is indicated by a two-dot chain line. 1 The joint seal portion 7c is not sealed, and an opening 15a is formed in the upper edge 16, and an opening 15b is formed on the tip 7a side of the joint portion 7a. The partition seal portion 8 is sealed from the first side edge 18 to the second side edge 19 before filling with the contents, and two chambers, a first accommodating portion 11a and a second accommodating portion 11b, are formed. The opening 15a is the opening of the first accommodation portion 11a, and the opening 15b is the opening of the second accommodation portion 11b.

<Bottom gusset>
As shown in FIG. 3, the second intermediate surface 4 and the portion near the lower edge 17 of the front surface 1 form the first pleat, and the second intermediate surface 4 and the lower surface of the back surface 2 form the first fold. A second pleat is formed by the portion near the edge 17 . A bottom gusset portion 9 is formed by the first pleat portion and the second pleat portion. In the front view of FIG. 1, the first pleated portion can be seen below the folded portion 4a. In the rear view of FIG. 2, the second pleated portion can be seen below the folded portion 4a.

<Accommodation part>
Later, after the contents are accommodated through the opening 15a formed on the upper edge 16 side and the opening 15b formed on the tip 7a side of the joining palm portion 7, the upper sealing portion 10 and the first joining sealing portion 7c is sealed and the pouch is sealed. The upper seal portion 10 is formed to include an upper edge 16 from a first side edge 18 to a second side edge 19 . The first palm-joint seal portion 7c is formed so as to include the tip 7a of the palm-joint portion 7 from the first side edge 18 to the second side edge 19 . The storage portion after filling and sealing includes the inner edge of the first side seal portion 5a, the inner edge of the second side seal portion 5b, the first bottom seal portion 6a, the second bottom seal portion 6b, and the first joint seal portion. 7c, the second joint seal portion 7d, and the inner edge of the steam release seal portion 7e.

The storage portion is partitioned into a first storage portion 11a and a second storage portion 11b by a partition seal portion 8. As shown in FIG. The first accommodation portion 11a is formed between the top seal portion 10 and the first bottom seal portion 6a and the second bottom seal portion 6b. will be formed between Since the first accommodation portion 11a has a size reaching from the vicinity of the upper edge 16 to the vicinity of the lower edge 17, the volume of the first accommodation portion 11a is larger than the volume of the second accommodation portion 11b.

<Contents>
The contents include the first contents accommodated in the first accommodation portion 11a and the second contents accommodated in the second accommodation portion 11b. The first content and the second content are not particularly limited, but the first content is staple foods such as rice and noodles, main dishes such as meat and fish, and side dishes such as vegetables. The second content is seasoning. Such contents are assumed because the volume of the first storage portion 11a is larger than the volume of the second storage portion 11b.

<Details of packaging materials>
The front surface 1, back surface 2, first intermediate surface 3, and second intermediate surface 4 of the pouch are composed of the front film, back film, first intermediate film, and second intermediate film, respectively, as described above. can do. As the front film, the back film, the first intermediate film, and the second intermediate film, packaging materials that are common laminated films are used. The packaging material used in this embodiment is a laminate including at least a base film and a sealant film from the outside. As the base film, it is preferable to use two or more uniaxially or biaxially oriented stretched plastic films. For example, the packaging material preferably comprises a first stretched plastic film, a second stretched plastic film, and a sealant film laminated in this order from the outer surface side.

The first stretched plastic film, the second stretched plastic film, and the sealant film can be laminated by forming an adhesive layer by, for example, a dry lamination method using an adhesive. FIG. 4 is a cross-sectional view showing an example of the layer structure of the packaging material. In FIG. 4, the upper side indicates the outer surface side, and the lower side indicates the inner surface side (the side in contact with the contents). As shown in FIG. 4, the packaging material 30 used in the present embodiment has a first stretched plastic film 31, a second stretched plastic film 32, and a sealant film 33 laminated in order from the outer surface side. The first stretched plastic film 31 and the second stretched plastic film 32 are adhered by an adhesive layer 34 , and the second stretched plastic film 32 and the sealant film 33 are adhered by an adhesive layer 35 .

The pouch of this embodiment is required to have resistance to heat. Therefore, it is preferable that the first stretched plastic film 31 and the second stretched plastic film 32 are made of a heat-resistant material. For example, as materials for the first stretched plastic film 31 and the second stretched plastic film 32, polyester films such as polyethylene terephthalate and polybutylene terephthalate, polyamide films such as nylon, and polypropylene films can be used. Both thicknesses are about 10 μm to 50 μm. Although the same material can be used for the first stretched plastic film 31 and the second stretched plastic film 32, it is preferable to use different materials. The first stretched plastic film 31 and the second stretched plastic film 32 are preferably biaxially stretched.

The sealant film 33 is arranged on the innermost side of the packaging material 30 when the bag is made into a pouch. Polyolefin resins such as polyethylene, polypropylene, ethylene/vinyl acetate copolymer, ethylene/propylene block copolymer, and propylene/ethylene block copolymer can be used as the material of the sealant film 33 . The sealant film 33 is preferably unstretched.

Preferably, sealant film 33 is a single layer film comprising a propylene-ethylene block copolymer. For example, the sealant film 33 is a single-layer unstretched film whose main component is a propylene-ethylene block copolymer. By using the propylene/ethylene block copolymer, the impact resistance of the sealant film 33 can be enhanced, and the pouch can be prevented from being broken due to impact when dropped. In addition, the puncture resistance of the packaging material 30 can be enhanced.

The strength of the seal portion formed by the sealant film 33 at a high temperature, for example, 100°C is defined as the hot seal strength, and the strength of the seal portion formed by the sealant film 33 at a low temperature, for example, 25°C. Room temperature seal strength. By using the propylene/ethylene block copolymer, the hot seal strength becomes smaller than the normal temperature seal strength. Since the hot seal strength is low, when the pouch is heated using a microwave oven, the partition seal portion 8 is easily peeled off, and the first container portion 11a and the second container portion 11b are easily communicated. Furthermore, the vapor release seal portion 7e is easily peeled off, and the steam in the container portion 11 after the communication between the first container portion 11a and the second container portion 11b is easily released to the outside of the pouch. Therefore, it is possible to prevent the internal pressure of the containing portion 11 from becoming excessively large, and thereby to prevent the packaging material 30 from being damaged during heating.

The hot seal strength of the sealed portion of the pouch at 100° C. at a width of 15 mm is preferably 23 N or less, more preferably 20 N or less, and still more preferably 15 N or less. Moreover, the hot seal strength of the sealed portion of the pouch may be 11 N or less or 10 N or less. If the hot seal strength is too low, the partition seal portion 8 will peel off before the contents are sufficiently heated and pressurized, and the first accommodating portion 11a and the second accommodating portion 11b will communicate. There is a risk that it will not be possible to cook in the intended state. Furthermore, it is conceivable that the vapor release seal portion 7e is peeled off before the contents are sufficiently heated and pressurized, and the pressure and temperature of the containing portion 11 are lowered. Considering this point, the hot seal strength of the sealed portion of the pouch is preferably 4N or more, more preferably 5N or more.

In addition, the room-temperature sealing strength of the sealed portion of the pouch at 25° C. in a width of 15 mm is preferably 60 N or less, more preferably 55 N or less, and may be 50 N or less. By forming the seal portion so that the room temperature seal strength is 60 N or less, the hot seal strength of the seal portion can be 23 N or less. In addition, the room-temperature sealing strength of the sealed portion of the pouch at 25° C. in a width of 15 mm is preferably 35 N or more, more preferably 40 N or more, and may be 45 N or more or 50 N or more. By forming the sealing portion so that the room-temperature sealing strength is 35 N or more, it is possible to suppress peeling of the sealing portion of the pouch due to the force applied to the pouch during transportation. Further, by forming the seal portion so that the room temperature seal strength is 40 N or more, it is possible to suppress variations in the room temperature seal strength due to variations in the sealing temperature.

The propylene/ethylene block copolymer includes, for example, a sea component made of polypropylene and an island component made of an ethylene/propylene copolymer rubber component. The sea component can contribute to enhancing blocking resistance, heat resistance, rigidity, seal strength, etc. of the propylene/ethylene block copolymer. Also, the island component can contribute to increasing the impact resistance of the propylene/ethylene block copolymer. Therefore, by adjusting the ratio of the sea component and the island component, the mechanical properties of the sealant film 33 containing the propylene/ethylene block copolymer can be adjusted.

In the propylene/ethylene block copolymer, the mass ratio of the sea component made of polypropylene is higher than the mass ratio of the island component made of the ethylene/propylene copolymer rubber component. For example, in a propylene/ethylene block copolymer, the mass ratio of the sea component made of polypropylene is at least 51% by mass or more, preferably 60% by mass or more, and more preferably 70% by mass or more.

The single-layer sealant film 33 may further contain a second thermoplastic resin in addition to the first thermoplastic resin made of a propylene-ethylene block copolymer. Examples of the second thermoplastic resin include α-olefin copolymers and polyethylene. The α-olefin copolymer is, for example, linear low density polyethylene. Examples of polyethylene include low density polyethylene, medium density polyethylene and high density polyethylene. The second thermoplastic resin can contribute to increasing the impact resistance of the sealant film 33 .

In the sealant film 33, the mass ratio of the first thermoplastic resin made of the propylene/ethylene block copolymer is higher than the mass ratio of the second thermoplastic resin containing at least the α-olefin copolymer or polyethylene. The sealant film 33 contains a propylene/ethylene block copolymer as a main component. Therefore, for example, in the single-layer sealant film 33, the mass ratio of the first thermoplastic resin made of a propylene/ethylene block copolymer is at least 51% by mass or more, preferably 60% by mass or more. Preferably, it is 70% by mass or more.

As described above, the second thermoplastic resin can contribute to increasing the impact resistance of sealant film 33 . Therefore, by adjusting the mass ratio of the second thermoplastic resin containing at least the α-olefin copolymer or polyethylene in the single-layer sealant film 33, the mechanical properties of the sealant film 33 can be adjusted.

Moreover, the sealant film 33 may further contain a thermoplastic elastomer. By using a thermoplastic elastomer, the impact resistance and puncture resistance of the sealant film 33 can be further enhanced.

The thickness of the sealant film 33 is preferably 30 μm or more, more preferably 40 μm or more. Also, the thickness of the sealant film 33 is preferably 100 μm or less, more preferably 80 μm or less.

Preferred mechanical properties of the single-layer sealant film 33 containing the propylene/ethylene block copolymer are described below. The tensile modulus (MPa) of the sealant film 33 at 25° C. in the machine direction (MD), which is the conveying direction of the packaging material 30, is preferably 500 MPa or more, more preferably 600 MPa or more, 650 MPa or more, or 700 MPa. or more. The product of the tensile modulus (MPa) of the sealant film 33 and the thickness (μm) of the sealant film 33 in the machine direction (MD) is preferably 35,000 or more, more preferably 38,000 or more, and still more preferably 45,000. That's it. In addition, the tensile modulus (MPa) of the sealant film 33 in the vertical direction (TD) at 25° C. is preferably 450 MPa or higher, more preferably 500 MPa or higher, and may be 550 MPa or higher, or 600 MPa or higher. . In addition, the product of the tensile modulus (MPa) of the sealant film 33 and the thickness (μm) of the sealant film 33 in the vertical direction (TD) is preferably 25,000 or more, more preferably 30,000 or more, and still more preferably 35,000. or more, and may be 38000 or more. The sealant film 33 having a high tensile modulus can enhance the tearability when opening the pouch. In this embodiment, the machine direction (MD) corresponds to the direction from the upper edge 16 to the lower edge 17 of the pouch and the direction from the tip 7a to the base 7b of the palm-joint portion 7, which is the first direction.

In addition, the tensile elongation (%) of the sealant film 33 in the machine direction (MD) at 25° C. is preferably 1100 (%) or less, more preferably 1000 (%) or less, and 900 (%) or less. , or 800 (%) or less. The product of the tensile elongation (%) of the sealant film 33 in the machine direction (MD) and the thickness (μm) of the sealant film 33 is preferably 55000 or less, more preferably 50000 or less. In addition, the tensile elongation (%) of the sealant film 33 in the vertical direction (TD) at 25° C. is preferably 1200 (%) or less, more preferably 1100 (%) or less, and 1000 (%) or less. , or 900 (%) or less. The product of the tensile elongation (%) of the sealant film 33 and the thickness (μm) of the sealant film 33 in the vertical direction (TD) is preferably 60000 or less, more preferably 55000 or less. Tensile modulus and tensile elongation can be measured according to JIS K7127. As a measuring instrument, a tensile tester with a constant temperature bath "RTC-1310A" manufactured by Orientec Co., Ltd. can be used. As such a sealant film 33, an unstretched polypropylene film "ZK207" manufactured by Toray Advanced Film Co., Ltd. can be used.

In the pouches shown in FIGS. 1 and 2, the first direction, which is the direction from the upper edge 16 to the lower edge 17 and the direction from the tip 7a to the base 7b of the joining palm portion 7, is the sealant film 33 or the like. and the second direction, which is the direction from the first side edge 18 to the second side edge 19, is the vertical direction of the packaging material 30, such as the sealant film 33, which constitutes the pouch. be. The first direction, which is the direction from the upper edge 16 to the lower edge 17 and the direction from the tip 7a of the joint portion 7 to the base portion 7b, is the vertical direction of the packaging material 30, and from the first side edge 18 to the second side edge 19. The pouch may be configured such that the second direction, which is the facing direction, is the flow direction of the packaging material 30 .

The packaging material 30 may include printed layers and other layers. The printed layer is provided to display the contents of the product, to give an aesthetic impression, and to display the cut portion. The printing layer is formed with a printing ink containing a binder and a pigment.

Other layers may be provided outside the base film (the first stretched plastic film 31 and the second stretched plastic film 32), may be provided between the base films, or may be provided between the base films. and the sealant film 33 . Other layers are appropriately selected according to required functions such as water vapor and other gas barrier properties and light shielding properties. For example, when another layer is a gas barrier layer, a deposited layer of a metal such as aluminum, a metal oxide such as aluminum oxide, or an inorganic oxide such as silicon oxide is provided. The deposited layer may be laminated on the base film or may be deposited on the sealant film 33 . Alternatively, a metal foil such as aluminum may be provided. In addition, a resin layer having gas barrier properties such as ethylene-vinyl alcohol copolymer (EVOH), polyvinylidene chloride resin (PVDC), and aromatic polyamide such as nylon MXD6 may be provided. Each layer can be laminated using a dry lamination method, a melt extrusion method, or the like.

Some specific examples of preferred packaging materials are shown below. The packaging material is not limited to the following specific examples, and other configurations can also be used.
・Polyester film/printed layer/adhesive layer/polyamide film/adhesive layer/CPP (non-stretched polypropylene film)
・Polyester film/printing layer/adhesive layer/polyester film/adhesive layer/CPP
・Polyester film/transparent deposition layer/gas barrier coating film/printing layer/adhesive layer/polyamide film/adhesive layer/CPP
・Polyester film/transparent deposition layer/gas barrier coating film/printing layer/adhesive layer/polyester film/adhesive layer/CPP

The packaging material may further include a third stretched plastic film (not shown). Also, the first stretched plastic film 31 is preferably a polyester film. The second stretched plastic film 32 and the third stretched plastic film can be polyester films or polyamide films. As the polyester film, a film containing a polycondensate of terephthalic acid and a diol as a main component can be used. Examples include polybutylene terephthalate, which is a polycondensate of 1,4-butanediol. A nylon film can be used as the polyamide film. Instead of the first stretched plastic film 31, the second stretched plastic film 32 may be provided with a transparent deposition layer and a gas barrier coating film.

In this embodiment, the packaging materials forming the front surface 1, the back surface 2, the first intermediate surface 3, and the second intermediate surface 4 are all common laminated films. For surface 3, the sealant film 33 may be of easy peel specification (easy peel sealant). The easy-peel sealant film 33 is a multi-layer sealant film of base layer (core layer)/seal layer. An ethylene/propylene copolymer or an ethylene/propylene random copolymer can be used as the base material layer. A blend of high density polyethylene and ethylene/propylene copolymer or a blend of high density polyethylene and ethylene/propylene random copolymer can be used as the seal layer. By configuring the first intermediate surface 3 with an easy-peel packaging material, the partition seal portion 8 and the vapor release seal portion 7e are easier to peel than the seal portion that partitions the first housing portion 11a.

<Manufacturing method>
Next, a method of manufacturing a pouch using the packaging material 30 described above will be described. Four packages as a front film, a back film, a first intermediate film and a second intermediate film for forming a front surface 1, a back surface 2, a first intermediate surface 3 and a second intermediate surface 4 Prepare materials 30; Then, the first intermediate surface 3 is folded back and inserted into the upper edge 16 side between the inner surfaces of the front surface 1 and the back surface 2 to face the edge of the first intermediate surface 3 and the lower edge 17 of the front surface 1. The edges are aligned as the tips 7a of the palm-joint portions 7, and the inner surfaces of the palm-joint portions 7 are overlapped with each other, and heat-sealed at a predetermined sealing temperature to form a second joint seal portion 7d and a vapor release seal portion 7e. , to form the partition seal portion 8 . At this time, the unsealed portion 7f is also formed at the same time.

Further, the second intermediate surface 4 is folded back at the folded portion 4a and inserted into the lower edge 17 side between the inner surfaces of the front surface 1 and the rear surface 2.例文帳に追加Next, the superimposed inner surfaces of the front surface 1, the back surface 2, the first intermediate surface 3, and the second intermediate surface 4 are heat-sealed at a predetermined sealing temperature to form the first side seal portions 5a, A second side seal portion 5b, a first bottom seal portion 6a, a second bottom seal portion 6b and a third bottom seal portion 6c are formed. The conditions for the heat-sealing treatment are set according to the material of the sealant film 33 so that the room-temperature sealing strength of the sealed portion is 60 N or less and the hot sealing strength is 23 N or less.

The heat-sealed together films are then cut into appropriate shapes to yield pouches such as those shown in Figures 1-3. Subsequently, the contents are filled into the first storage portion 11a and the second storage portion 11b of the pouch through the opening 15a on the upper edge 16 side and the opening 15b formed on the tip 7a side of the joining palm portion 7 . The first content to be stored in the first storage portion 11a is, for example, food such as rice, noodles, meat, fish, and vegetables. The second contents stored in the second storage portion 11b are, for example, seasonings to be added to foods such as rice, noodles, meat, fish, and vegetables.

After that, on the side of the upper edge 16, the superimposed inner surfaces of the front surface 1, the rear surface 2, and the first intermediate surface 3 are heat-sealed at a predetermined sealing temperature to close the openings 15a and 15b, and the upper portion is sealed. The part 10 forms the first joint seal part 7c. Thereby, as shown in FIGS. 5 and 6, a sealed pouch containing the contents can be obtained. 5 and 6, illustration of contents is omitted. After that, sterilization treatment such as boiling treatment or retort treatment is performed on the pouch containing the contents, if necessary.

<Method for measuring seal strength>
Next, a method for measuring the seal strength of the sealed portion of the pouch will be described. Seal strength can be measured according to JIS Z1707 7.5. As a measuring device, for example, a tensile tester with a constant temperature bath “RTC-1310A” manufactured by Orientec Co., Ltd. can be used.

First, a test piece S for measuring the seal strength of the seal portion is prepared. For example, in FIG. 5, as indicated by the dashed line frame, a portion including the first side seal portion 5a is cut out of the front surface 1 and the back surface 2 of the pouch, and a test piece extending along the second direction get S. A width W4 of the test piece S in the first direction perpendicular to the second direction is 15 mm.

Then, as shown in FIG. 7, the unsealed portion of the test piece S is pulled by a pair of chucks 25 using a tensile tester, and a tensile load is applied until the seal portion breaks, and the maximum load during that time is taken as the seal strength. In FIG. 7, the shaded portion of the test piece S corresponds to the seal portion. As the tensile tester, "RTC-1310A tensile tester with thermostat" manufactured by Orientec Co., Ltd. was used, the distance L2 between chucks was 40 mm, and the tensile test speed was 300 mm/min.

<Heating of contents>
Next, the heating of the pouch filled with contents will be described. When cooking, first, the pouch is placed inside the microwave oven with the lower edge 17 facing down and the pouch standing on its own. Next, a microwave oven is used to heat the filled pouch. As a result, the temperature of the contents rises, the moisture contained in the contents evaporates, and the pressures of the first container 11a and the second container 11b increase.

When the pressure of the first accommodating portion 11a and the second accommodating portion 11b increases, the force received from the first accommodating portion 11a and the second accommodating portion 11b causes the front surface 1, the back surface 2, the first intermediate surface 3, and the second intermediate surface to expand. Face 4 bulges outward. At this time, in the first accommodation portion 11a, the first side seal portion 5a, the second side seal portion 5b, the first bottom seal portion 6a, the second bottom seal portion 6b, and the upper portion which form the first accommodation portion 11a. A force is applied to the seal portion 10 from only one direction outward from the center of the first housing portion 11a. In addition, in the second accommodation portion 11b, the first joint seal portion 7c, the second joint seal portion 7d, and the steam release seal portion 7e forming the second accommodation portion 11b are provided with a Force is applied from only one direction. On the other hand, the partition seal portion 8 that partitions the first accommodation portion 11a and the second accommodation portion 11b has a force from the center of the first accommodation portion 11a (from the bottom to the top in FIG. 5) and a force applied to the second accommodation portion 11b. A force is applied from the center of (from top to bottom in FIG. 5).

That is, a first side seal portion 5a, a second side seal portion 5b, a first bottom seal portion 6a, a second bottom seal portion 6b, a first joint seal portion 7c, and a second joint seal portion, which are outer edge seal portions. 7d, force is applied to the steam release seal portion 7e from only one direction, while force is applied to the partition seal portion 8 from two directions. Therefore, a larger force is applied to the partition seal portion 8 than the outer edge seal portion, the first joint seal portion 7c, the second joint seal portion 7d, and the vapor release seal portion 7e, and the partition seal portion 8 is peeled first. . Thereby, the 1st accommodating part 11a and the 2nd accommodating part 11b connect, and the heated seasoning and staple food are mixed. In this way, the staple food and the seasoning separately filled in the two storage portions are cooked only by heating in the microwave oven.

From this state, when the heating by the microwave oven continues and the pressure of the communicating first accommodating portion 11a and the second accommodating portion 11b increases, the force received from the first accommodating portion 11a and the second accommodating portion 11b causes the front surface to 1, the back surface 2, the first intermediate surface 3, and the second intermediate surface 4 further bulge outward. Here, in the present embodiment, the sealing portion is configured so that the normal temperature sealing strength is 60 N or less. This makes it possible to obtain a pouch having a seal portion having a hot seal strength of 23 N or less. Therefore, the vapor release seal portion 7e can be peeled off before the temperature of the contents contained in the pouch becomes excessively high or the pressure inside the containing portion becomes excessively high. When the vapor release seal portion 7e is peeled off, the unsealed portion 7f allows communication between the second housing portion 11b and the outside, and vapor is released to the outside. Therefore, it is possible to prevent the packaging material 30 of the pouch from being perforated or wrinkled in the packaging material 30 during heating.

<Modification/Overall form>
A modification of the pouch form will be described. In the above embodiment, the pouch has the bottom gusset portion 9 that allows the pouch to stand on its own with the lower edge 17 facing downward. A form of only the first intermediate surface 3 may be employed. FIG. 8 shows a variant without the bottom gusset portion 9. As shown in FIG. FIG. 8 is a front view of a modified pouch. Parts similar to those of the pouch of the embodiment shown in FIG. A rear view is also omitted. As can be seen by comparison with FIG. 5, in the variant of FIG. 8, the bottom gusset portion 9 is absent. This is because the second intermediate surface 4, which serves as the bottom surface, does not exist. When the pouch shown in FIG. 8 is placed in a microwave oven or the like, it is usually used with the back surface 2 facing downward. That is, the depth direction of the paper surface of FIG. 8 is used as the downward direction, and the front surface 1 on the front side of the paper surface of FIG. 8 is used as the upward direction. This differs from the pouch of the embodiment shown in Figure 5 which is used with the lower edge 17 down and the upper edge 16 up.

<Modification / Opening and closing mechanism>
Next, a modification in which the first accommodating portion 11a is provided with an opening/closing mechanism will be described. 9 and 10 are diagrams showing a modified example having an opening/closing mechanism. FIG. 9 is a rear view showing a pouch according to a modification. FIG. 10 is a cross-sectional view corresponding to line BB shown in FIG. In the modification shown in FIGS. 9 and 10, an opening/closing mechanism is formed along the upper edge 16 to open and reseal the first housing portion 11a. As shown in FIG. 9, the pouch of the modified example is provided with an openable and closable fastener 20 consisting of a male member 21 and a female member 22 that engage with each other, as an opening and closing mechanism, near the upper edge 16 of the first housing portion 11a. . As shown in FIG. 9, the strip-shaped bite tool 20 is provided along the second direction (horizontal direction in FIG. 9) on the side of the upper edge 16, and the male member 21 includes a strip-shaped first base portion 21a and a second One side of one base portion 21a is provided with a male interlocking portion 21b, and the other side of the first base portion 21a is joined to the inner surface of the back surface 2, respectively. The female member 22 has a strip-shaped second base portion 22a and a female engagement portion 22b on one side of the second base portion 22a. there is

The fastener 20 formed along the second direction can be used as a so-called zipper, and can open and reseal the first accommodating portion 11a. 9 and 10, the first base portion 21a may be joined to the first intermediate surface 3 and the second base portion 22a may be joined to the rear surface 2. FIG.

As the material of the bite tool 20, a resin having compatibility with the sealant film 33 of the packaging material 30 can be used. The articulator 20 consists of a male member 21 and a female member 22 as shown in FIG. At this time, by interposing a heat shield plate (not shown) between the male member 21 and the female member 22, heat fusion between the male member 21 and the female member 22 is prevented.

In the variant of FIG. 9, the opening means 14 are formed between the upper edge 16 and the bite tool 20 in the first direction at the first side edge 18 and the second side edge 19 . The unsealing means 14 are notches provided in the first side seal portion 5a and the second side seal portion 5b. The unsealing means is not limited to a cut like the unsealing means 14, but may be a notch or a group of scars penetrating a part or all of the packaging material. These unsealing means may be provided on only one of the first side seal portion 5a and the second side seal portion 5b. Alternatively, the opening means may be an easy opening line extending from the first side seal portion 5a toward the second side seal portion 5b. The easy-to-open line may be a half-cut line that penetrates the base film but does not penetrate the sealant film. The half-cut line may be formed using a blade, or may be formed by laser processing. Also, the half-cut line may be a line that extends continuously or a line that extends intermittently. Also, the half-cut line may be provided so as to extend from one side edge of the pouch to the other side edge. In addition, although it is preferable that the unsealing means is formed, it is not essential.

In the modified examples of FIGS. 9 and 10, after the content (seasoning, etc.) is filled in the second container portion 11b, the second container portion 11b is sealed with the first palm-to-hand seal portion 7c. By opening the bag from the opening means 14 formed in the first side seal portion 5a and the second side seal portion 5b of the upper portion of the bite tool 20, the first housing portion 11a can be opened and closed by the bite tool 20. It is also possible for the user to fill food such as a staple food through the opening formed on the upper edge 16 side. Instead of providing the opening/closing mechanism in the first accommodation portion 11a, or in addition, the opening/closing mechanism may be provided in the second accommodation portion 11b.

Modifications such as the overall form and opening/closing mechanism described above can be used in combination as appropriate.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and modifications, and various modifications are possible. For example, in the above embodiment, the front surface 1, the back surface 2, the first intermediate surface 3, and the second intermediate surface 4 are composed of the front surface film, the back surface film, the first intermediate film, and the second intermediate film, respectively. By doing so, the four surfaces are formed by four sheets of packaging material, but the four surfaces may be formed by appropriately cutting one to three sheets of packaging material and pasting them together.

When the pouch is manufactured with three or less films, the top seal portion 10, the first bottom seal portion 6a, and the first palm-to-hand seal portion 7c may not be present. In such a case, the first accommodation portion 11a is formed to extend between the upper edge and the lower edge, and the second accommodation portion 11b is formed to extend between the partition seal portion 8 and the tip 7a of the joint portion 7. It is formed.

1 Front surface 2 Back surface 3 First intermediate surface (upper surface)
4 . . . Second intermediate surface (bottom surface)
4a... Folded part 5a... First side seal part 5b... Second side seal part 6a... First bottom seal part 6b... Second bottom seal part 6c... Third Bottom seal portion 7 Plunge portion 7a Tip 7b Base portion 7c First paddle seal portion 7d Second paddle seal portion 7e Vapor release seal portion 7f Not yet Seal part 7g... Opening 8... Partition seal part 9... Bottom gusset part 10... Top seal part 11a... First accommodating part 11b... Second accommodating part 14... Unsealing means 15a, 15b... Opening 16... Upper edge 17... Lower edge 20... Articulator 21... Male member 22... Female member L1... Inner edge of second palm-to-palm seal portion 7d to the inner edge of the steam release seal portion 7e W1: First side seal portion 5a, second side seal portion 5b, first bottom seal portion 6a, second bottom seal portion 6b, third bottom seal portion Seal width of 6c W2...Seal width of steam release seal portion 7e W3...Seal width of partition seal portion 8

Claims (9)

A pouch formed from a packaging material comprising at least a first stretched plastic film and a sealant film, the pouch having a front surface and a back surface,
having a top edge, a bottom edge opposite the top edge, first and second side edges extending between the top and bottom edges;
Equipped with a joint on the front side,
The palm-to-palm portion is provided from the first side edge to the second side edge,
Having a sealing portion that joins the inner surface of the packaging material,
The seal portion comprises an outer edge seal portion for forming a housing portion, a palm-to-palm seal portion provided on the palm-to-palm portion, a steam release seal portion that separates due to an increase in pressure in the housing portion, and the housing portion. including a partition seal for dividing into two ,
The partition seal portion is provided in the region of the palm -to-palm portion,
The steam release seal portion is provided between the partition seal portion and the tip of the joint portion,
The accommodation portion includes a first accommodation portion extending between an upper seal portion extending along the upper edge and a first bottom seal portion extending along the lower edge, and extending along the tips of the partition seal portion and the palm-to-palm portion. and a second accommodation portion extending between the first joint seal portions,
A pouch characterized by: The pouch has a front film, a back film facing the front film, and a first intermediate film located on the upper edge side of the front film and the back film. cage,
The seal strength between the front film and the first intermediate film at 100° C. is 23 N or less.
The pouch according to claim 1, characterized in that: The seal strength of the seal portion between the front film and the first intermediate film at 25° C. is 60 N or less.
The pouch according to claim 2, characterized in that: In the front film and the first intermediate film, the tensile elastic modulus (MPa) and the thickness (μm) of the sealant film in the first direction, which is the direction from the upper edge to the lower edge of the pouch is 35000 or more,
The pouch according to claim 2 or 3, characterized in that: The sealant film contains a propylene/ethylene block copolymer as a main component,
The pouch according to any one of claims 1 to 4, characterized in that: 6. The pouch according to claim 5, wherein the sealant film contains a propylene-ethylene block copolymer and an α-olefin copolymer as main components. 7. The pouch of any one of claims 1-6, further comprising a bottom gusset portion. A first content is accommodated in the first container,
The pouch according to any one of claims 1 to 7, characterized in that: A second content is accommodated in the second accommodation portion,
the first content and the second content are different;
The pouch according to claim 8, characterized in that:

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