JP2021017262A - Skin pack packaging body - Google Patents

Abstract

To provide a skin pack packaging body hard to burst even when heated as it is in a microwave oven.SOLUTION: A skin pack packaging body (1) includes a bottom member (2) and a lid member (3). The bottom member (2) and the lid member (3) are heat-sealed in an adherent state with an object (4) to be packaged interposed therebetween. A heat seal strength between the bottom member (2) and the lid member (3) measured based on JIS Z0238:1998 is 0.5 N/15 mm or more and 7 N/15 mm or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a skin pack package.

A skin pack package that is heat-sealed with an object to be packaged sandwiched between the bottom material and the lid material is used. An example of such a skin pack package is disclosed in, for example, Japanese Patent Application Laid-Open No. 2016-222259 (Patent Document 1). Since the skin pack package is less likely to wrinkle and has a good appearance, it is suitably used for packaging, for example, ham, raw meat, cooked food, etc. as an object to be packaged. At this time, in order to securely seal the packaged object, the bottom material and the lid material are firmly sealed.

By the way, in the skin pack package, when the object to be packaged is, for example, a cooked food, the skin pack package may be heated in the microwave oven as it is in order to heat the cooked food. In such a case, if the seal between the bottom material and the lid material is too strong, the internal pressure becomes excessively high due to the steam generated from the object to be packaged inside the skin pack package during heating, and eventually the internal pressure cannot be withstood. There was a risk that the bottom material or lid material would burst.

Japanese Unexamined Patent Publication No. 2016-222259

It is desired to realize a skin pack package that does not easily burst even when heated in a microwave oven as it is.

The skin pack package according to the present invention is
A skin pack package having a bottom material and a lid material, and the bottom material and the lid material are heat-sealed with an object to be packaged sandwiched between them.
The heat seal strength between the bottom material and the lid material measured in accordance with JIS Z 0238: 1998 is 0.5 N / 15 mm or more and 7 N / 15 mm or less.

According to this configuration, when the heat seal strength between the bottom material and the lid material is 0.5 N / 15 mm or more, the sealability between the bottom material and the lid material can be ensured. Further, since the heat seal strength between the bottom material and the lid material is 7 N / 15 mm or less, when the internal pressure is increased to some extent by the steam generated from the packaged object inside the skin pack package during heating, the seal portion is formed. Partially steam. Since the internal pressure of the skin pack package is reduced by this steaming, the bottom material and the lid material are prevented from bursting. As described above, according to the above configuration, it is possible to provide a skin pack package that does not easily burst even when heated in a microwave oven as it is.

Hereinafter, preferred embodiments of the present invention will be described. However, the scope of the present invention is not limited by the preferred embodiments described below.

As one aspect
It is preferable that the heat seal strength differs between the MD direction and the TD direction, and the ratio of the heat seal strength in the MD direction to the heat seal strength in the TD direction is 0.3 or more and 3.0 or less.

According to this configuration, the steaming direction at the time of heating can be controlled by making the heat seal strength in the MD direction and the heat seal strength in the TD direction different from each other. For example, the ratio of the heat seal strength in the MD direction to the heat seal strength in the TD direction (hereinafter referred to as "MD / TD ratio") is set to less than 1, and the mixture can be selectively ventilated in the MD direction during heating. .. Further, the MD / TD ratio can be made larger than 1, so that the MD / TD ratio can be selectively vaporized in the TD direction during heating. By setting the MD / TD ratio within the range of 0.3 or more and 3.0 or less, the degree of anisotropy can be suppressed to a relatively small level, and the ease of opening can be ensured.

As one aspect
It is preferable that the lid material is composed of a laminated film of a polyethylene-based resin layer, an ethylene-vinyl alcohol copolymer layer, and an ethylene-vinyl acetate copolymer layer.

According to this configuration, a skin pack having excellent followability to the packaged object and excellent mechanical properties and storage stability is used by using a lid material having excellent strength, gas barrier property, flexibility, and sealing property with the bottom material. Packaging can be provided.

As one aspect
It is preferable that the seal layer of the bottom material is made of a polyethylene-based resin, a polypropylene-based resin, or a laminated film containing both of them.

According to this configuration, when heat-sealed with the lid material, it is easy to appropriately realize a heat-sealing strength of 0.5 N / 15 mm or more and 7 N / 15 mm or less.

Further features and advantages of the present invention will be further clarified by the following illustration of exemplary and non-limiting embodiments described with reference to the drawings.

Schematic cross-sectional view of the skin pack package

An embodiment of the skin pack package will be described with reference to the drawings. As shown in FIG. 1, the skin pack package 1 of the present embodiment includes a bottom material 2 and a lid material 3. In the skin pack package 1, the bottom material 2 and the lid material 3 are heat-sealed with the object to be packaged 4 sandwiched between them. In the skin pack package 1, the packaged object 4 can be stored in a sealed state for a certain period of time, and then the bottom material 2 and the lid material 3 can be peeled off to take out the packaged object 4.

The bottom material 2 includes at least a skin layer 21 and a seal layer 22. The skin layer 21 is a layer that forms the skin on the outermost surface side of the bottom material 2, and can be composed of a known resin layer having a certain strength. The skin layer 21 is not particularly limited, but may be specifically composed of, for example, a polyethylene-based resin, a polypropylene-based resin, a polyester-based resin, or the like. The polyethylene-based resin is not particularly limited, and may be, for example, a homopolymer of ethylene, a block copolymer of ethylene and another monomer, or a random copolymer of ethylene and another monomer. Good. Hereinafter, other "-based resins" can be considered in the same manner.

The seal layer 22 is a layer that is adhered to the seal layer 33 of the lid material 3. The seal layer 22 can be composed of a known resin layer that exhibits a certain sealing property. The seal layer 22 is not particularly limited, but specifically, it can be made of, for example, a polyolefin resin or the like. Examples of the polyolefin-based resin include polyethylene-based resin and polypropylene-based resin. Alternatively, the seal layer 22 can be made of, for example, a laminated film containing both a polyethylene resin and a polypropylene resin.

The thickness of the bottom material 2 is not particularly limited, but can be, for example, 0.03 mm or more and 0.5 mm or less.

The lid material 3 includes at least a skin layer 31, an intermediate layer 32, and a seal layer 33. The skin layer 31 is a layer that forms the skin on the outermost surface side of the lid material 3, and can be composed of a known resin layer having a certain strength. The skin layer 31 is not particularly limited, but may be specifically composed of, for example, a polyethylene-based resin, a polypropylene-based resin, a polyester-based resin, or the like. In the present embodiment, the seal layer 33 is mainly composed of a polyethylene resin.

The intermediate layer 32 is a layer provided between the skin layer 31 and the seal layer 33, and is a layer for blocking gas in the present embodiment. The intermediate layer 32 functions as a gas barrier layer, and can be composed of a known resin layer having a certain gas barrier property. The intermediate layer 32 is not particularly limited, but may be specifically composed of, for example, an ethylene-vinyl alcohol copolymer or the like.

The seal layer 33 is a layer that is adhered to the seal layer 22 of the bottom material 2. The seal layer 33 can be composed of a known resin layer that exhibits a certain sealing property. The seal layer 33 is not particularly limited, but may be specifically composed of, for example, an ethylene-vinyl acetate copolymer or the like.

The lid material 3 is a laminate of a polyethylene-based resin layer constituting the skin layer 31, an ethylene-vinyl alcohol copolymer layer constituting the intermediate layer 32, and an ethylene-vinyl acetate copolymer layer constituting the seal layer 33. It is preferably composed of a film. The thickness of the lid material 3 is not particularly limited, but can be, for example, 0.05 mm or more and 0.3 mm or less.

The multilayer film constituting the bottom material 2 and the lid material 3 is not particularly limited, but can be formed by, for example, a coextrusion method, an extrusion lamination method, a heat lamination method, or the like.

The packaged object 4 may be, for example, raw meat, prepared food, processed meat product, processed marine product, cooked food, or the like. Since the skin pack package 1 of the present embodiment can be suitably heated in a microwave oven as it is as described later, the cooked food that is expected to be used in advance is used as the packaged object 4. Especially suitable for packaging.

The skin pack package 1 of the present embodiment has a heat seal strength (hereinafter referred to as “seal strength”) between the bottom material 2 and the lid material 3 measured in accordance with JIS Z 0238: 1998. It is characterized in that it is 5N / 15mm or more and 7N / 15mm or less. If the sealing strength is less than 0.5 N / 15 mm, the adhesive force between the bottom material 2 and the lid material 3 is not sufficient, and the sealing property may not be ensured. On the other hand, when the sealing strength exceeds 7 N / 15 mm, the adhesive strength between the bottom material 2 and the lid material 3 is too strong, and when the skin pack package 1 is heated in the microwave oven as it is, inside. The internal pressure is excessively increased by the steam generated from the packaged object 4. Then, when the internal pressure cannot be withstood, the bottom material 2 or the lid material 3 may burst. When the bottom material 2 or the lid material 3 bursts, the oil or the like contained in the packaged object 4 (typically, the cooked food) is scattered, which is not preferable.

Therefore, by setting the sealing strength to 0.5N / 15mm or more and 7N / 15mm or less as described above, while ensuring the sealing property between the bottom material 2 and the lid material 3, inside the skin pack package 1 during heating. When the internal pressure is increased to some extent by the steam generated from the packaged object 4, the sealed portion can be partially steamed. Since the internal pressure of the skin pack package 1 is reduced by this steaming, the bottom material 2 and the lid material 3 can be prevented from bursting, and oil and the like can be prevented from scattering.

The sealing strength is preferably 2N / 15 mm or more from the viewpoint of ensuring the sealing property between the bottom material 2 and the lid material 3 more reliably. Further, from the viewpoint of more reliably and partially ventilating the seal portion as the internal pressure increases, it is preferably 5 N / 15 mm or less. That is, the seal strength is preferably 2N / 15 mm or more and 5N / 15 mm or less.

The sealing temperature at the time of heat-sealing the bottom material 2 and the lid material 3 is not particularly limited, but may be, for example, 100 ° C. or higher and 155 ° C. or lower. The sealing temperature is preferably 130 ° C. or higher and 150 ° C. or lower. The sealing time for heat-sealing the bottom material 2 and the lid material 3 is not particularly limited, but can be, for example, 10 seconds or more and 30 seconds or less. The sealing time is preferably 15 seconds or more and 25 seconds or less.

Further, in the skin pack package 1, it is preferable that the seal strengths are different from each other in the MD direction and the TD direction. By providing anisotropy to the seal strength, it is possible to selectively vaporize in the MD direction or the TD direction when heated in a microwave oven. For example, the ratio of the seal strength in the MD direction to the seal strength in the TD direction (hereinafter referred to as “MD / TD ratio”) is set to less than 1, and the seal strength can be selectively vaporized in the MD direction during heating. Further, the MD / TD ratio can be made larger than 1, so that the MD / TD ratio can be selectively vaporized in the TD direction during heating. By adjusting the MD / TD ratio in this way, the steaming direction during heating can be controlled.

In this case, the MD / TD ratio is preferably 0.3 or more and 3.0 or less. If the MD / TD ratio is less than 0.3 or more than 3.0, the degree of anisotropy becomes too large, and the skin pack package 1 may be difficult to open. Therefore, by setting the MD / TD ratio to 0.3 or more and 3.0 or less (however, 1 is excluded), the degree of anisotropy is kept relatively small and the ease of opening is ensured. , The ventilation direction at the time of heating can be controlled.

Further, the MD / TD ratio is more preferably 0.9 or less or 1.1 or more because it is easier to control the steaming direction at the time of heating if a certain degree of clear anisotropy is present. It is more preferably 8 or less or 1.3 or more. That is, the MD / TD ratio is more preferably 0.3 or more and 0.9 or less, or 1.1 or more and 3.0 or less, and 0.3 or more and 0.8 or less, or 1.3 or more and 3 It is more preferably 0.0 or less.

A test example will be shown below, and the present invention will be described in more detail. However, the scope of the present invention is not limited by the specific test examples described below.

[Test Example 1]
As the bottom material 2, a laminated sheet of a polyethylene terephthalate layer forming the skin layer 21, an ethylene-vinyl alcohol copolymer layer, a nylon layer, and a polyethylene-based easy peel layer forming the seal layer 22 was prepared. The thickness of this laminated sheet was 0.062 mm. As the lid material 3, a laminated film of a polyethylene layer constituting the skin layer 31, an ethylene-vinyl alcohol copolymer layer constituting the intermediate layer 32, and an ethylene-vinyl acetate copolymer layer constituting the seal layer 33 is provided. Got ready. The thickness of this laminated film was 0.12 mm. A skin seal sample was prepared by vacuum-adheringly wrapping the bottom material 2 and the lid material 3 under the conditions of a sealing temperature of 120 ° C. and a sealing time of 20 seconds using a vacuum-adhesion packaging machine "Himan" manufactured by Hi-Pack.

For this skin seal sample, the seal strength in the MD direction and the seal strength in the TD direction were measured with a width of 15 mm in accordance with JIS Z 0238: 1998, respectively. The seal strength in the MD direction was 2.5 N, the seal strength in the TD direction was 2.4 N, and the MD / TD ratio was 1.04. In addition, a skin pack package 1 is actually prepared by sandwiching fried chicken (atypical, 30 to 40 g) as the object to be packaged 4, and heated at 600 W for 60 seconds in a microwave oven. As a result of observation, it was confirmed that steam selectively escaped in the TD direction at the peripheral sealing portion when the internal pressure increased. No rupture was found in the bottom material 2 and the lid material 3.

[Test Example 2]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 1 except that the seal temperature was 135 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 2.9 N, the seal strength in the TD direction was 5.7 N, and the MD / TD ratio was 0.51. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 3]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 1 except that the seal temperature was set to 150 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 3.1 N, the seal strength in the TD direction was 4.7 N, and the MD / TD ratio was 0.66. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 4]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 1 except that the thickness of the laminated film constituting the lid material 3 was 0.15 mm.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 2.4 N, the seal strength in the TD direction was 1.1 N, and the MD / TD ratio was 2.18. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the TD direction, and the bottom material 2 and the lid material 3 were used. No rupture was found.

[Test Example 5]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 4 except that the seal temperature was 135 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 3.8 N, the seal strength in the TD direction was 5.4 N, and the MD / TD ratio was 0.70. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 6]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 4 except that the seal temperature was set to 150 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 3.0 N, the seal strength in the TD direction was 4.6 N, and the MD / TD ratio was 0.65. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 7]
Except for the fact that a laminated foam sheet consisting of a expanded polystyrene layer constituting the skin layer 21, a modified polyethylene layer, an ethylene-vinyl alcohol copolymer layer, and a polypropylene layer forming the seal layer 22 was used as the bottom material 2. A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 1. The thickness of the laminated foam sheet was 3 mm.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 0.3 N, the seal strength in the TD direction was 0.4 N, and the MD / TD ratio was 0.75. Further, when the obtained skin pack package 1 was observed, the sealing performance between the bottom material 2 and the lid material 3 was clearly inferior.

[Test Example 8]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 7, except that the seal temperature was 135 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 3.8 N, the seal strength in the TD direction was 3.0 N, and the MD / TD ratio was 1.27. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the TD direction, and the bottom material 2 and the lid material 3 were used. No rupture was found.

[Test Example 9]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 7 except that the seal temperature was set to 150 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 3.1 N, the seal strength in the TD direction was 2.2 N, and the MD / TD ratio was 1.41. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the TD direction, and the bottom material 2 and the lid material 3 were used. No rupture was found.

[Test Example 10]
Except for the fact that a laminated foam sheet consisting of a expanded polystyrene layer constituting the skin layer 21, a modified polyethylene layer, an ethylene-vinyl alcohol copolymer layer, and a polypropylene layer forming the seal layer 22 was used as the bottom material 2. A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 4.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 1.4 N, the seal strength in the TD direction was 1.9 N, and the MD / TD ratio was 0.74. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 11]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 10 except that the seal temperature was 135 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 4.3 N, the seal strength in the TD direction was 4.5 N, and the MD / TD ratio was 0.96. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 12]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 10 except that the seal temperature was set to 150 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 6.4 N, the seal strength in the TD direction was 7.4 N, and the MD / TD ratio was 0.86. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 13]
Except that a laminated sheet of a polyethylene terephthalate layer constituting the skin layer 21, an ethylene-vinyl alcohol copolymer layer, a nylon layer, and a polypropylene-based easy peel layer constituting the seal layer 22 was used as the bottom material 2. , A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 3.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 1.3 N, the seal strength in the TD direction was 1.7 N, and the MD / TD ratio was 0.76. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 14]
Except that a laminated sheet of a polyethylene terephthalate layer constituting the skin layer 21, an ethylene-vinyl alcohol copolymer layer, a nylon layer, and a polypropylene-based easy peel layer constituting the seal layer 22 was used as the bottom material 2. , A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 5.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 1.3 N, the seal strength in the TD direction was 1.8 N, and the MD / TD ratio was 0.72. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 15]
A skin seal sample and a skin pack package 1 were prepared in the same manner as in Test Example 14 except that the seal temperature was set to 150 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 1.5 N, the seal strength in the TD direction was 2.1 N, and the MD / TD ratio was 0.71. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the MD direction, and the bottom material 2 and the lid material 3 had No rupture was found.

[Test Example 16]
The same as in Test Example 6 except that a laminated sheet of a polypropylene layer constituting the skin layer 21, an ethylene-vinyl alcohol copolymer layer, and a polypropylene layer constituting the seal layer 22 was used as the bottom material 2. A skin seal sample and a skin pack package 1 were prepared. The thickness of the laminated sheet was 0.38 mm.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 2.5 N, the seal strength in the TD direction was 1.5 N, and the MD / TD ratio was 1.67. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that steam selectively escaped in the TD direction, and the bottom material 2 and the lid material 3 were used. No rupture was found.

[Test Example 17]
A skin seal sample and a skin pack package were prepared in the same manner as in Test Example 10 except that the seal temperature was 160 ° C.

When the seal strength of the obtained skin seal sample was measured, the seal strength in the MD direction was 7.2 N, the seal strength in the TD direction was 8.0 N, and the MD / TD ratio was 0.90. Further, when the state of the obtained skin pack package 1 after heating in a microwave oven was observed, it was confirmed that the skin pack package burst and the contents were scattered.

In Test Example 7 in which the sealing strength is less than 0.5N in both the MD direction and the TD direction, the sealing performance is clearly inferior, and in Test Example 17 in which the sealing strength exceeds 7N in both the MD direction and the TD direction. , The skin pack package burst during heating and the contents were scattered. On the other hand, in Test Examples 1 to 6, 8 to 16 in which the sealing strength in at least one of the MD direction and the TD direction is 0.5 N or more and 7 N or less, while showing good sealing performance in normal times, steaming during heating The skin pack package 1 did not burst through the process.

The embodiments disclosed in the present specification are examples in all respects, and can be appropriately modified without departing from the spirit of the present disclosure.

1 Skin pack package 2 Bottom material 3 Lid material 4 Packaged material 33 Seal layer

Claims (4)

A skin pack package having a bottom material and a lid material, and the bottom material and the lid material are heat-sealed with an object to be packaged sandwiched between them.
A skin pack package having a heat seal strength between the bottom material and the lid material measured in accordance with JIS Z 0238: 1998 of 0.5 N / 15 mm or more and 7 N / 15 mm or less. According to claim 1, the heat seal strength differs between the MD direction and the TD direction, and the ratio of the heat seal strength in the MD direction to the heat seal strength in the TD direction is 0.3 or more and 3.0 or less. Described skin pack packaging. The skin pack package according to claim 1 or 2, wherein the lid material is composed of a laminated film of a polyethylene-based resin layer, an ethylene-vinyl alcohol copolymer layer, and an ethylene-vinyl acetate copolymer layer. The skin pack package according to any one of claims 1 to 3, wherein the sealing layer of the bottom material is made of a polyethylene-based resin, a polypropylene-based resin, or a laminated film containing both of them.

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