JP2024026921A - Packaging bags, packaged foods and their usage - Google Patents

Abstract

The present invention provides a pillow-type packaging bag, a packaged food product, and a method for using the same, which can appropriately discharge steam generated during microwave heating. [Solution] A laminated film 1 constituting a packaging bag 101 has a laminated film for adjusting lamination strength so that a steam port 11 for discharging steam generated by microwave heating of the contents from a storage space 7 is formed. It has a steam port forming resin layer 4. The sealant layer 6 constituting the laminated film 1 has the conditional formula: ΔMD<ΔTD (ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm), ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm)). [Selection diagram] Figure 1

Description

The present invention relates to a packaging bag, a packaged food product, and a method of using the same. For example, the present invention relates to a packaging bag for heating in a microwave oven made of a heat-sealed laminated film, and a packaging bag for heating in a microwave oven in which food is hermetically packaged in the packaging bag. It concerns packaged foods and how to use them.

BACKGROUND ART Packaged foods that can be heated in a microwave oven and contain retort foods, frozen foods, and the like are widely used. When this packaged food is heated in a microwave, the moisture contained in the contents evaporates as the food is heated, and the pressure inside the packaging bag increases due to the generated steam. If the pressure inside the packaging bag increases, the packaging bag may tear and the contents may scatter, contaminating the inside of the microwave oven. Therefore, in order to release the steam generated during microwave heating to the outside of the packaging bag, a pillow-type packaging bag has been proposed that is equipped with a steam release mechanism in the center of the center seal part or at the intersection of the center seal part and the end seal part. (For example, see Patent Document 1.)

Japanese Patent Application Publication No. 2007-217050

In a pillow-type packaging bag as proposed in Patent Document 1, when a packaged food directly filled with oil-rich contents without using a tray or the like is heated in a microwave, the oil released from the contents is transferred to the packaging bag. It accumulates in the lower part of the interior and becomes hot. This is because the microwaves concentrate on the accumulated oil, and the heated oil causes a reduction in seal strength. For example, in a pillow-type packaging bag that has a steam release mechanism at the intersection of the center seal and end seal, if the packaged food is placed horizontally with the center seal facing down and heated in the microwave, The oil that has accumulated near the center of the center seal section becomes hot and causes the center seal section to separate, causing liquid leakage. As a result, there was a problem in that it was not possible to properly vent steam.

The present invention was made in view of these circumstances, and its purpose is to appropriately discharge steam generated during microwave heating in packaging bags that are directly filled with contents without using a tray or the like. The purpose of the present invention is to provide a pillow type packaging bag, especially a gusseted pillow type packaging bag, a packaged food product, and a method for using the same.

In order to achieve the above object, the packaging bag of the first invention is a pillow-type packaging bag in which a storage space for accommodating contents is formed inside by heat-sealing a laminated film,
The laminated film has a laminated structure including a base layer, an adhesive layer, and a sealant layer,
The laminated film has a steam port-forming resin layer for adjusting lamination strength so that a steam port for discharging steam generated by microwave heating of the contents from the accommodation space is formed in a part of the heat-sealed part. have,
Regarding the MD direction, which is the film flow direction, and the TD direction, which is perpendicular to the MD direction, the center seal portion is parallel to the MD direction, and the sealant layer satisfies the following conditional expression (1). It is characterized by
ΔMD<ΔTD…(1)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

A packaging bag according to a second invention is characterized in that, in the first invention, the sealant layer satisfies the following conditional expression (2).
1.2≦ΔTD/ΔMD…(2)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

A packaging bag according to a third invention is characterized in that, in the first or second invention, the sealant layer satisfies the following conditional expression (3) when the thickness is 30 to 60 μm.
35≦ΔTD≦75…(3)
however,
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

The packaging bag of a fourth aspect of the invention is characterized in that, in any one of the first to third aspects, in a region where the center seal part and the front part are located adjacent to each other, one of the front part and the back part is located. It is characterized in that the laminated film constituting at least one of the vapor port-forming resin layers has the vapor port-forming resin layer.

In the packaging bag of a fifth aspect of the invention, in any one of the first to third inventions, gusset portions are located on both sides with respect to the center seal portion, one gusset portion, the front surface portion, and the back surface. The laminated film forming at least one of the front part, the back part, and the gusset part has the vapor port forming resin layer in the region including the folded top part where the parts are adjacent to each other. do.

A packaging bag according to a sixth invention is characterized in that, in any one of the first to fifth inventions, the base layer is made of a uniaxially stretched film.

The packaging bag of a seventh aspect of the present invention is the packaging bag according to any one of the first to sixth aspects, wherein in a stand state in which the gusset section is located below the center seal section, the gusset section is located above the center seal section. It is characterized in that at least one of the heat-sealed portions located at both ends has a notch for opening.

A packaged food according to an eighth invention is a packaged food for heating in a microwave oven, which includes a packaging bag according to any one of the first to seventh inventions, and a state where the contents are housed in the storage space. The food is hermetically sealed and packaged.

A method of using the ninth invention is a method of using the packaged food according to the eighth invention, comprising:
The packaged food is placed in a microwave oven in a horizontal state with the front part and the back part lined up in the vertical direction, and heated in the microwave;
After the steam generated in the storage space is discharged from the steam port, the packaged food is removed from the microwave oven,
opening the packaged food in a stand state with the gusset section located below the center seal section;
It is characterized in that the food is eaten while using the packaging bag as an eating container.

According to the present invention, even when contents with high oil content (for example, foods such as fried chicken, fried rice, and sausages) are directly filled into a packaging bag without using a tray or the like, steam generated during microwave heating can be discharged. It is possible to do this properly. For example, even if the packaged food is placed horizontally with the center seal side down and heated in a microwave, the center seal part is prevented from peeling off, so liquid leakage can be prevented. Therefore, appropriate steam release is possible.

FIG. 1 is a schematic diagram showing a first embodiment of a packaging bag. FIG. 3 is a schematic diagram showing an example in which the arrangement of the steam port forming resin layer is changed in the first embodiment. A schematic diagram showing a second embodiment of a packaging bag. FIG. 2 is a side view showing the first and second embodiments of the packaged food. FIG. 3 is a schematic diagram showing an example in which the shape and arrangement of the notches are changed in the first embodiment. FIG. 2 is a schematic diagram showing a specific example of how to use the packaged food according to the first embodiment. Schematic diagram showing a specific example of how to use the packaged food according to the second embodiment. Schematic diagram showing a third embodiment of a packaging bag.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a packaging bag, a packaged food, a method of use, etc. according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same reference numerals are given to the same parts or corresponding parts in each embodiment, specific example, etc., and redundant explanation will be omitted as appropriate.

FIG. 1 schematically shows the general structure of a pillow-type packaging bag 101 according to the first embodiment, and FIG. 3 schematically shows the general structure of a pillow-type packaging bag 102 according to the second embodiment. show. In FIG. 1, (A) is a plan view schematically showing the packaging bag 101 in a folded state, and (B) is a sectional view taken along the line L1-L1' of (A). Further, in FIG. 1, (C) is a perspective view schematically showing the packaging bag 101 in a stand-up state, and (D) is a sectional view taken along the line M1-M1' in (C). In FIG. 3, (A) is a plan view schematically showing the packaging bag 102 in a folded state, and (B) is a sectional view taken along the line L2-L2' of (A). Further, in FIG. 3, (C) is a perspective view schematically showing the packaging bag 102 in a stand-up state, and (D) is a sectional view taken along the line M2-M2' in (C).

The packaging bags 101 and 102 are both made of a single laminated film 1, and both ends of the laminated film 1 are heat-sealed (thermal adhesive) so that a storage space 7 for accommodating the contents is formed inside. It is made into a cylindrical shape (the center seal part 10 is formed) and made into a pillow pouch. In addition, first and second seal parts 8 and 9 (end seal parts) are formed as heat seal parts at both ends perpendicular to the center seal part 10, so that the accommodation space 7 is formed in a sealed state. It is now possible to do so. Note that heat sealing is performed under sealing temperature conditions within a range that does not impair the properties and functions of the product during bag making using a continuous bag making machine that manufactures the actual product.

At the top of the first and second seal parts 8 and 9, linear notches 8a and 9a are formed on the left and right peripheral edges, which serve as starting points when opening the seal. The shape is not limited to a V-shape, a U-shape, or the like. Further, the positions of the cuts 8a and 9a are set so that the direction of tearing from the cuts 8a and 9a coincides with the linear easy-tear direction of the laminated film 1. In other words, the laminated film The MD direction of No. 1 is set to match the direction of fracture from the cuts 8a and 9a. Note that with respect to the center seal portion 10, the parallel direction is set to the MD direction, and the perpendicular direction is set to the TD direction.

It is preferable to display that the opening cuts 8a, 9a are formed at the locations where the cuts 8a, 9a are formed. By displaying that the notches 8a and 9a are for opening, the consumer can easily recognize the opening position. Note that the incision display for opening can be made by gravure printing or the like when producing the laminated film 1.

Furthermore, as shown in FIG. 5, the shape of the cut 8a' is approximately triangular, and the cut 8a is made only in the first seal part 8 (on the opposite side to the second seal part 9 where the steam port forming resin layer 4, which will be described later, is located). ' is preferably provided. By arranging the notches 8a' in this manner, the risk of bringing one's fingers close to the steam vent 11 when opening the packaging bags 101, 102 is reduced, making it possible to open the packaging bags with peace of mind. Further, the approximately triangular cut 8a' can be easily formed by changing the shape of the blade for separating the packaging bags 101, 102 one by one when manufacturing the packaging bags 101, 102 with a pillow-type filling and packaging machine. It becomes possible to form.

In the stand state in which the gusset portion 1c, which will be described later, is located below the center seal portion 10 ((C) in FIGS. 1 and 3), the gusset portions 1c at both ends located above the center seal portion 10 as described above are It is preferable that at least one of the first and second seal parts 8 and 9 has opening cuts 8a and 9a. For example, from the positional relationship with the steam port 11 described above, only the cut 8a' may be provided (FIG. 5), or from the viewpoint of more reliable opening, the cut 8a, 9a (FIGS. 1 and 3C) is preferable. Furthermore, by providing the cuts 8a and 9a below the steam port 11 (FIG. 1(C)), the form of the packaging bag 101 after opening is simplified, which has the advantage of making it easier to use as an eating container. be.

The packaging bags 101 and 102 include a front part 1a and a back part 1b having a center seal part 10. Furthermore, in the packaging bag 101, gusset portions 1c and 1d formed by folding parallel to the center seal portion 10 are provided on both upper and lower sides (both sides with the center seal portion 10 as a reference) between the front portion 1a and the back portion 1b. In the packaging bag 102, a gusset portion 1c consisting of a fold parallel to the center seal portion 10 is provided on the lower side (one side based on the center seal portion 10) between the front portion 1a and the back portion 1b. It is being

In the packaging bags 101 and 102, the center seal part 10 is pasted on the back (gassho pasted) so that it is located in the center of the back part 1b. may be placed to one side. Further, regardless of whether the pouch has a single gusset type or a double gusset type, it can be manufactured using a general filling and packaging machine, and it can also be easily made into a stand-up state.

As shown in FIGS. 1(D) and 3(D), the laminated film 1 constituting the packaging bags 101, 102 includes a base material layer 2 as an outer layer, a sealant layer 6 as an inner layer, and a layer between them. It consists of a printing ink layer 3, an adhesive layer 5, etc. that are provided. That is, the laminated film 1 has a laminated structure including a base material layer 2, a printing ink layer 3, an adhesive layer 5, and a sealant layer 6 from the outside of the packaging bag to the inside of the packaging bag. Further, a steam port forming resin layer 4 for adjusting the lamination strength is formed inside the printing ink layer 3 on the front side 1a of the laminated film 1 so as to straddle the second seal part 9. A steam port 11 for discharging steam generated by heating from the accommodation space 7 is formed.

The base material layer 2 is required to have strength to withstand loads from printing operations, refrigerated/frozen storage, microwave heating, etc., so it is recommended to use a synthetic resin film with excellent mechanical, physical, and chemical properties. preferable. In addition, from the viewpoint of tearing when opening the package, the base layer 2 is preferably made of a uniaxially stretched film (having straight-line cut properties), and may have a vapor-deposited film if necessary. From these viewpoints, specific examples of the base layer 2 include polyamide films (having oxygen barrier properties as needed) such as uniaxially stretched nylon (ONY) films.

As the sealant layer (thermoadhesive resin layer) 6, one can be appropriately selected and used depending on the physical properties required for the packaging bags 101, 102 (conditional expression (1) etc. to be described later). However, in the region where the steam port-forming resin layer 4 is located, it is necessary to use a material that will break for steaming, which will be described later. From this point of view, specific examples of the sealant layer 6 include polyethylene films such as linear low density polyethylene (LLDPE) film and low density polyethylene (LDPE) film. Further, the thickness of the sealant layer 6 is preferably 30 to 60 μm.

The printing ink layer 3 is formed of colored ink, and specific examples thereof include a pattern layer, a white ink layer, and the like. The adhesive layer 5 is formed of, for example, a dry laminating adhesive commonly used in dry laminating methods. Specific examples of adhesives include polyvinyl acetate adhesives, polyacrylic ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, and polyamide adhesives. , amino resin adhesives, epoxy adhesives, polyurethane adhesives, and the like.

Specific examples of the laminated film 1 include uniaxially stretched ON/printing/LLDPE, uniaxially stretched PET/printing/LLDPE, ON/uniaxially stretched PET/printing/LLDPE, and OPP/printing/LLDPE. however,
Base material layer 2 / printing ink layer 3 / sealant layer 6,
Uniaxial stretching ON: Uniaxial stretching (linear cutability) nylon film,
Uniaxially oriented PET: uniaxially oriented (linear cutability) polyethylene terephthalate (PET) film,
LLDPE: linear low density polyethylene film,
OPP: biaxially oriented polypropylene film,
It is.

The steam port forming resin layer 4 is made of a heat softening resin (high temperature softening resin) that has a predetermined laminate strength at room temperature (approximately 30° C.) or lower ambient temperature, but whose strength decreases at high ambient temperature. It consists of The environmental temperature that has a specified strength is usually the environmental temperature during the packaging process where the contents are packaged, the environmental temperature during the process where the packaging bag containing the contents is refrigerated or frozen, and the environmental temperature when the bag is transported and stored in a refrigerated or frozen state. These include the environmental temperature during the distribution stage. Therefore, at such an environmental temperature, a predetermined strength is maintained in the steam port forming resin layer 4. Furthermore, the high environmental temperature at which the predetermined strength is reduced is the temperature that occurs when the packaging bags 101 and 102, in which the contents are sealed and packaged, are heated and cooked in a microwave oven. The strength of layer 4 will be reduced. Therefore, by forming the steam port-forming resin layer 4, the lamination strength between the base material layer 2 and the sealant layer 6 in the formation region becomes high under a room temperature environment and becomes low under a high temperature environment.

As the material for the steam port forming resin layer 4 having the above properties, it is preferable to use a heat softening resin (such as release varnish) having a melting point of 60 to 90°C. Specific examples thereof include nitrified cotton-polyamide resin, polyamide-nitrified cotton-polyethylene wax-based resin, and ethylene-vinyl acetate copolymer resin. By using a heat-softening resin with a melting point of 60 to 90°C, when cooking in a microwave oven, interlayer peeling due to steaming (interfacial peeling between the surface of the resin layer 4 and the adhesive layer 5), which will be described later, can be prevented through the steam vent. This can be facilitated by forming the resin layer 4. Therefore, the coating amount of the material used for the steam port forming resin layer 4 only needs to be extremely small.

The steam port forming resin layer 4 is formed so as to straddle the second seal portion 9 as described above. In other words, the steam port forming resin layer 4 is applied to a part of the second seal part 9 between the printing ink layer 3 and the adhesive layer 5 on the front part 1a of the laminated film 1, than the inner edge of the second seal part 9. It is formed to cross the second seal part 9 from the inside to the outer edge of the second seal part 9. In the same formation region, the steam port forming resin layer 4 may be provided on the back surface portion 1b, or may be provided on both the front surface portion 1a and the back surface portion 1b.

FIG. 2 shows an example in which the arrangement of the steam port forming resin layer 4 is changed in the first embodiment. In FIG. 2(A), the steam port forming resin layer 4 is provided on the back surface portion 1b, and in FIG. 2(B), the steam port forming resin layer 4 is provided on the gusset portion 1d. In either case, the steam port forming resin layer 4 is located in the region including the folded top P where the gusset part 1d, the front part 1a, and the back part 1b are located adjacent to each other (FIG. 1(D), FIG. 2). There is. That is, in the region including the top part P of the fold, it is sufficient that the laminated film 1 forming at least one of the front part 1a, the back part 1b, and the gusset part 1d has the vapor port forming resin layer 4.

When cooking is performed in a microwave oven, internal pressure increases due to steam (water vapor, etc.) generated from the contents, and the packaging bags 101 and 102 become strongly swollen. Due to the decrease in the strength of the steam port forming resin layer 4 due to the high temperature environment described above, the adjacent sealant layer 6 is subjected to a large load and stretches and breaks. This is because cracks are likely to occur at the boundary between the region where the steam port forming resin layer 4 is provided and the region where it is not provided, and in the vicinity thereof. Delamination progresses from this fractured location due to internal pressure. In other words, the separation between the layers of the steam port forming resin layer 4 proceeds from the inner edge of the second seal part 9 to the outer edge of the second seal part 9. When the delamination reaches the outer edge of the second seal part 9, the steam in the storage space 7 is released from the steam port 11 to the outside (steaming), and the internal pressure of the packaging bags 101, 102 decreases. Become.

The vapor port forming resin layer 4 is preferably formed by a gravure printing method, and it is preferable to form the vapor port forming resin layer 4 in-line at the same time as the printing ink layer 3. The thickness of the steam port forming resin layer 4 is preferably 1 μm or more and 5 μm or less. When the film thickness is less than 1 μm, peeling between the steam port forming resin layer 4 becomes difficult to occur during microwave heating, and when the film thickness exceeds 5 μm, the appearance and manufacturing process may be affected. Usually, the laminated film 1 before bag making is supplied in the form of a roll, and is made into a bag shape using a packaging machine. In the rolled laminated film 1, the portion where the vapor port forming resin layer 4 is formed rises, and as a result, that portion stretches, resulting in poor bag making, resulting in a decrease in yield, and the finished appearance after bag making being unsatisfactory. There is a possibility that it may turn out to be bad.

The lamination strength of the region where the steam port forming resin layer 4 is provided (the lamination strength between the base material layer 2 and the sealant layer 6) is preferably 0.3 to 2N/15mm width at the environmental temperature below the room temperature, and is high. The width is preferably 0.3 N/15 mm or less at environmental temperature (environmental temperature of 90° C. or higher). Further, the lamination strength of the area where the steam port forming resin layer 4 is not provided is preferably 1.5 N/15 mm width or more at an environmental temperature below the room temperature, and 0.5 N/width at a high environmental temperature (an environmental temperature of 90° C. or higher). A width of 15 mm or more is preferable.

When an LLDPE film (thickness: 30 μm) is used as the sealant layer 6, the heat seal strength of the region where the steam port forming resin layer 4 is provided is preferably 7 N/15 mm width or more at an environmental temperature below the room temperature, and at a high environmental temperature. (environmental temperature of 90°C or higher) and a width of 4N/15mm or less is preferable. Further, the heat seal strength of the area where the steam port forming resin layer 4 is not provided is preferably 7.0 N/15 mm or more at an environmental temperature below the room temperature, and 3 N/15 mm at a high environmental temperature (an environmental temperature of 90° C. or higher). Width or more is preferable. At a high environmental temperature (at an environmental temperature of 90° C. or higher), the heat seal strength of the area where the steam port forming resin layer 4 is not provided is 1N/15 mm compared to the heat seal strength of the area where the steam port forming resin layer 4 is provided. It is preferable to design it so that it is larger than the width.

The sealant layer 6 is configured to satisfy the following conditional expression (1) from the viewpoint of preventing steam from escaping from the center seal.
ΔMD<ΔTD…(1)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

By using the sealant layer 6 that satisfies conditional expression (1), the oil-rich contents F (for example, foods such as fried chicken, fried rice, and sausage) can be directly packaged in the packaging bags 101 and 102 without using a tray or the like. Even when the container is filled with water, it is possible to properly discharge the steam V generated during microwave heating. For example, even when the packaged foods 201 and 202 are placed horizontally and heated in a microwave with the center seal portion 10 facing down, peeling of the center seal portion 10 is suppressed, thereby preventing liquid leakage. be able to. That is, since the elongation at break in the TD direction of the sealant layer 6 is large, it is possible to buy time until the steam port 11 steams by suppressing peeling of the center seal portion 10. Therefore, appropriate steam release is possible.

In addition to conditional expression (1), the sealant layer 6 more preferably satisfies the following conditional expression (2), and even more preferably satisfies the following conditional expression (2a).
1.2≦ΔTD/ΔMD…(2)
1.5≦ΔTD/ΔMD…(2a)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

From the viewpoint of heat resistance, the sealant layer 6 preferably satisfies the following conditional expression (3) when the thickness is 30 to 60 μm. According to this configuration, it is possible to prevent the inner surfaces of the packaging bags 101 and 102 from temporarily adhering to each other after heating in the microwave.
35≦ΔTD≦75…(3)
however,
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

FIG. 4(A) shows the side appearance of the packaged food 201 according to the first embodiment, and FIG. 4(B) shows the side appearance of the packaged food 202 according to the second embodiment. When manufacturing packaged foods 201 and 202, food F (assumed contents: frozen/chilled products, fried chicken, etc. ). Then, a second seal part 9 is formed by heat-sealing the front part 1a, the back part 1b, etc., and if necessary, a process such as retort heating is performed, and the food F is sealed in the storage space 7. Packaged foods 201 and 202 for microwave heating are obtained. Note that the usage of the packaging bags 101 and 102 is not limited to retort packaging. Depending on the specific sterilization treatment and distribution format, etc., it can be used for boiling sterilization at a lower temperature (below 100°C) than for retorts, for hot packs that sterilize the inside of the packaging bag simply by raising the temperature of the contents, or for distribution without heat treatment. Uses include refrigeration, etc.

6 and 7 show specific examples of how to use the packaged foods 201 and 202, respectively. First, as shown in FIGS. 6 and 7 (A), the packaged foods 201 and 202 are set in a microwave oven (microwave heating space S) in a horizontal state with the front part 1a and the back part 1b lined up in the vertical direction. Heat in the microwave. The packaging bags 101 and 102 are configured with an internal pressure opening type steam release mechanism using the steam port forming resin layer 4 described above, so that the steam V in the storage space 7 can escape to the outside of the packaging bag during heating in the microwave. Therefore, the packaged foods 201 and 202 before microwave heating are in a sealed packaged state. In addition, since the sealant layer 6 has high heat resistance, even if the center seal part 10 is located on the lower side, it is possible to prevent the seal from retreating due to accumulated oil.

When steam V is generated from the food F by microwave heating, the internal pressure of the packaging bags 101 and 102 increases. The sealant layer 6 stretches and ruptures due to the cooperation with the steam port forming resin layer 4 (reduction in laminate strength), and delamination progresses from this ruptured location as a starting point. When the delamination reaches the outer edge of the second seal part 9, as shown by the arrow mv in (A) of FIGS. The gas is exhausted (vaporized) to the outside of 101 and 102, and the pressure inside the housing space 7 is reduced. After the microwave heating is completed (that is, after the steam V generated in the storage space 7 is discharged from the steam port 11), the packaged foods 201 and 202 are taken out from the microwave heating space S.

The packaged foods 201 and 202 are placed on the table T as shown in FIGS. 6 and 7(B). In other words, the stand state is established in which the gusset portion 1c is located below the center seal portion 10. Then, the packaged foods 201, 202 are opened by tearing the upper part of the packaging bags 101, 102 from the cut 8a in the direction of arrow mm, and the food F is eaten while using the packaging bags 101, 102 as eating containers. Note that the package may be opened by tearing from the notch 9a.

As mentioned above, since the packaged foods 201 and 202 are heated in the microwave in a horizontal position, there is no fear of them falling over, and liquid leakage from the bottom of the packaging bag can be prevented, compared to heating in the microwave in a stand position. . Therefore, it is possible to properly discharge the steam V generated during microwave heating. Moreover, since the packaging bags 101 and 102 are provided with the gusset part 1c, by opening the packaged foods 201 and 202 that are in a stand state with the gusset part 1c, it is possible to use the packaging bags 101 and 102 as an eating container. You can eat food (eg, fried chicken, fried rice, sausage, etc.). Note that it is preferable that the above-mentioned instructions on how to use the packaged foods 201 and 202 be displayed by printing with the printing ink layer 3. The above effects can be reliably obtained by microwave heating, opening, eating, etc. according to the instructions while watching the display.

According to the packaging bag 101, since the gusset parts 1c and 1d are located on both sides with respect to the center seal part 10, a large amount of food F can be stored in the storage space 7. Moreover, in a region including the fold-in top P where one gusset part 1d, the front part 1a, and the back part 1b are located adjacent to each other, at least one of the front part 1a, the back part 1b, and the gusset part 1d is configured. Since the structure in which the laminated film 1 has the steam port forming resin layer 4 is adopted, the pressure caused by the steam V when the packaging bag 101 is inflated is concentrated on the storage space 7 side in the area including the folded top part P. The delamination occurs. Since the folded portion of the gusset portion 1d is lifted and opened, force is easily applied and peeling becomes easy. As a result, the steam V can be smoothly discharged during microwave heating. Therefore, it is possible to effectively balance the stabilization of the stand state of the packaged food 201, the stabilization of evaporation, and the accommodation of a large amount of the food F.

According to the packaging bag 102, in the area where the center seal part 10 and the front part 1a are located adjacent to each other, the laminated film 1 constituting at least one of the front part 1a and the back part 1b is provided with a steam port-forming resin layer. 4, the packaged food 202 can be eaten in a more stable stand state by placing the gusset portion 1c on the lower side. Moreover, the steam V can be smoothly discharged during microwave heating.

FIG. 8 schematically shows the general structure of a pillow-type packaging bag 103 according to the third embodiment in a folded state similar to FIG. 3(A). This packaging bag 103 does not have the gusset portion 1c, and has the same structure as the packaging bag 102 except for this. Therefore, except for this point, the same effects as the packaging bags 101 and 102 can be obtained.

As can be seen from the above description, the embodiments described above and the examples described below include the following characteristic configurations (#1) to (#9), ($1) to ($5), etc. There is.

(#1): A pillow-type packaging bag in which a storage space for accommodating the contents is formed inside by heat-sealing a laminated film,
A front part, a back part having a center seal part, and a gusset part formed by folding parallel to the center seal part between the front part and the back part, and perpendicular to the center seal part. The housing space is formed by forming heat seal parts at both ends of the housing,
The laminated film has a laminated structure including a base layer, an adhesive layer, and a sealant layer,
The laminated film has a steam port-forming resin layer for adjusting lamination strength so that a steam port for discharging steam generated by microwave heating of the contents from the storage space is formed in a part of the heat seal portion. has
Regarding the MD direction, which is the film flow direction, and the TD direction, which is perpendicular to the MD direction, the center seal portion is parallel to the MD direction, and the sealant layer satisfies the following conditional expression (1). A packaging bag characterized by;
ΔMD<ΔTD…(1)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

(#2): The packaging bag according to (#1), wherein the sealant layer satisfies the following conditional expression (2);
1.2≦ΔTD/ΔMD…(2)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

(#3): The packaging bag according to (#1) or (#2), characterized in that the sealant layer satisfies the following conditional expression (3) when the thickness is 40 μm;
25≦ΔTD≦50…(3)
however,
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is.

(#4): The gusset portions are located on both sides with the center seal portion as a reference, and one gusset portion, the front portion, and the back portion are located adjacent to each other in a region including the folded top portion. According to any one of (#1) to (#3), the laminated film forming at least one of the rear section, the back surface section, and the gusset section has the vapor port forming resin layer. packaging bag.

(#5): In a region where the center seal part and the front part are located adjacent to each other, the laminated film constituting at least one of the front part and the back part has the vapor port forming resin layer. The packaging bag according to any one of (#1) to (#3), characterized in that:

(#6): The packaging bag according to any one of (#1) to (#5), wherein the base layer is made of a uniaxially stretched film.

(#7): In the stand state in which the gusset portion is located below the center seal portion, at least one of the heat seal portions at both ends located above the center seal portion is provided with an opening for opening. The packaging bag according to any one of (#1) to (#6), characterized in that it has a notch.

(#8): A packaged food for heating in a microwave oven, comprising the packaging bag according to any one of (#1) to (#7) and the contents housed in the housing space. A packaged food comprising: a hermetically packaged food;

(#9): A method of using the packaged food described in (#8),
The packaged food is placed in a microwave oven in a horizontal state with the front part and the back part lined up in the vertical direction, and heated in the microwave;
After the steam generated in the storage space is discharged from the steam port, the packaged food is removed from the microwave oven,
opening the packaged food in a stand state with the gusset section located below the center seal section;
A method of use characterized by eating the food while using the packaging bag as an eating container.

($1): A method of using packaged food for microwave heating, comprising:
The packaged food is sealed and packaged in a pillow-type packaging bag in which a storage space for accommodating the contents is formed on the inside by heat-sealing a laminated film, and the contents are accommodated in the storage space. Equipped with food and
The packaging bag includes a front part, a back part having a center seal part, and a gusset part formed by folding parallel to the center seal part between the front part and the back part, and the center seal part. The accommodation space is formed by forming heat seal parts at both ends perpendicular to the part,
The laminated film has a steam port-forming resin layer for adjusting lamination strength so that a steam port for discharging steam generated by microwave heating of the contents from the storage space is formed in a part of the heat seal portion. has
The packaged food is placed in a microwave oven in a horizontal state with the front part and the back part lined up in the vertical direction, and heated in the microwave;
After the steam generated in the storage space is discharged from the steam port, the packaged food is removed from the microwave oven,
opening the packaged food in a stand state with the gusset section located below the center seal section;
A method of use characterized by eating the food while using the packaging bag as an eating container.

($2): The gusset portions are located on both sides with respect to the center seal portion, and one gusset portion, the front portion, and the back portion are located adjacent to each other in a region including the folded top portion. The method of use according to ($1), characterized in that the laminated film constituting at least one of the back section, the back surface section, and the gusset section has the vapor port forming resin layer.

($3): In a region where the center seal part and the front part are located adjacent to each other, the laminated film constituting at least one of the front part and the back part has the vapor port forming resin layer. The method of use described in ($1) is characterized by the following.

($4): The laminated film has a laminated structure including a base material layer, an adhesive layer, and a sealant layer, and the base material layer is made of a uniaxially stretched film ($1) ~ ($3) ).

($5): In a stand state in which the gusset portion is located below the center seal portion, at least one of the heat seal portions at both ends located above the center seal portion is provided with an opening seal. The method of use according to any one of ($1) to ($4), characterized in that it has a notch.

Hereinafter, packaging bags and the like embodying the present invention will be described in more detail.

The general laminated structure of the laminated film 1 used is as follows:
ONY (15) / Color ink, nitrified cotton - polyamide resin / Adhesive / LLDPE (40)
It is. however,
Base material layer 2/printing ink layer 3, steam port forming resin layer 4/adhesive layer 5/sealant layer 6,
ONY (15): Uniaxially stretched (straight line cutability) nylon film, thickness 15 μm,
LLDPE (40): Linear low density polyethylene film, thickness 40 μm,
It is.

The steam port-forming resin layer 4 was formed at predetermined locations using a nitrified cotton-polyamide resin by a gravure printing method so as to have a thickness of 1 to 5 μm. At that time, the outer edge of the second seal part 9 is applied from inside the inner edge of the second seal part 9 to a part of the second seal part 9 between the printing ink layer 3 and the adhesive layer 5 in the front part 1a of the pouch state. The steam port forming resin layer 4 was disposed so as to cross the second seal portion 9 until the end.

Packaging bags 101 and 102 were produced by making pillow pouches using the laminated film 1 described above. The dimensions of the pouch ((A) in Figures 1 and 3) are: d1=10 mm, and center seal width d2 of center seal portion 10=12.5 mm. After forming the first seal part 8, a predetermined amount of food F is filled into the packaging bags 101, 102 through the opening 9h, and the opening 9h is heat-sealed (forming the second seal part 9) to form a sealed state. .

When the packaged foods 201 and 202 were placed horizontally and heated in a microwave with the back side 1b side (center seal part 10 side) or front side 1a facing down (FIG. 6(A)), the steam vent 11 We were able to confirm normal steaming from the The packaged foods 201, 202 were taken out of the microwave oven, and the packaged foods 201, 202 were placed in a stand state on the table T with the gusset portion 1c side facing down (FIG. 6(B)). After opening the packaging bags 101 and 102 by tearing them in the direction of the arrow mm from the notch 8a, the food F was eaten while using the packaging bags 101 and 102 as eating containers.

Table 1 shows the measurement results (tensile strength, elongation at break, elongation ratio at break, etc. of sealant film samples 1 to 7) obtained by the hot tensile test (testing machine: Instron universal material testing machine, model 5967). . A sample of 15 mm width x 100 mm length was sampled from the target film (tested in MD and TD with N=8 each), and evaluated under tensile conditions of maximum 130 mm at a speed of 50 mm/min in a 100° C. environment with a chuck distance of 50 mm. Note that Samples 1 to 4 correspond to Examples, and Samples 5 to 7 correspond to Comparative Examples.

Table 2 shows the heat sealing strength at room temperature of the laminated product, and Table 3 shows the hot heat sealing strength of the laminated product. The heat sealing conditions for hot heat sealing strength (Table 3) are sealing temperature: 150°C, sealing pressure: 2kg/cm, and sealing time: 1 second. The seal strength is 25N/15mm (at room temperature) and 3-4N/15mm (hot) in areas with high-temperature softening resin, and 35-40N/15mm (at room temperature) and 8N/15mm (in hot) in areas without high-temperature softening resin. ).

1 Laminated film 1a Front part 1b Back part 1c, 1d Gusset part 2 Base material layer 3 Printing ink layer 4 Steam port forming resin layer 5 Adhesive layer 6 Sealant layer 7 Accommodation space 8 First seal part (heat seal part)
8a, 8a' Notch 9 2nd seal part (heat seal part)
9a Notch 9h Opening 10 Center seal portion 11 Steam port 101, 102, 103 Packaging bag 201, 202 Packaged food P Fold top F Food (contents)
V Steam T Table S Range heating space (microwave oven)

Claims (9)

A pillow-type packaging bag in which a storage space for accommodating contents is formed inside by heat-sealing a laminated film,
The laminated film has a laminated structure including a base layer, an adhesive layer, and a sealant layer,
The laminated film has a steam port-forming resin layer for adjusting lamination strength so that a steam port for discharging steam generated by microwave heating of the contents from the accommodation space is formed in a part of the heat-sealed part. have,
Regarding the MD direction, which is the film flow direction, and the TD direction, which is perpendicular to the MD direction, the center seal portion is parallel to the MD direction, and the sealant layer satisfies the following conditional expression (1). A packaging bag characterized by;
ΔMD<ΔTD…(1)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is. The packaging bag according to claim 1, wherein the sealant layer satisfies the following conditional expression (2);
1.2≦ΔTD/ΔMD…(2)
however,
ΔMD: elongation at break in the MD direction of the sealant layer at 100°C (mm),
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is. The packaging bag according to claim 1, wherein the sealant layer satisfies the following conditional expression (3) when the thickness is 30 to 60 μm;
35≦ΔTD≦75…(3)
however,
ΔTD: elongation at break in the TD direction of the sealant layer at 100°C (mm),
It is. In a region where the center seal part and the front part are located adjacent to each other, the laminated film constituting at least one of the front part and the back part has the vapor port forming resin layer. The packaging bag according to claim 1. Gusset portions are located on both sides with respect to the center seal portion, and one gusset portion, the front portion, and the back portion are located adjacent to each other in a region including a folded top portion. The packaging bag according to claim 1, wherein the laminated film constituting at least one of the gusset portions has the vapor port forming resin layer. The packaging bag according to claim 1, wherein the base layer is made of a uniaxially stretched film. In a stand state in which the gusset part is located below the center seal part, at least one of the heat seal parts at both ends located above the center seal part has an opening cut. The packaging bag according to claim 1, characterized by: A packaged food for heating in a microwave oven, comprising the packaging bag according to any one of claims 1 to 7, and a hermetically packaged food stored in the storage space as the content. A packaged food product characterized by: A method of using the packaged food according to claim 8, comprising:
The packaged food is placed in a microwave oven in a horizontal state with the front part and the back part lined up in the vertical direction, and heated in the microwave;
After the steam generated in the storage space is discharged from the steam port, the packaged food is removed from the microwave oven,
opening the packaged food in a stand state with the gusset section located below the center seal section;
A method of use characterized by eating the food while using the packaging bag as an eating container.

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