JP6660112B2 - Filled food paper container - Google Patents

Description

  The present invention relates to a filled food paper container used for producing a container-filled food which is filled with a food material such as tofu, sealed, and heated and solidified.

2. Description of the Related Art There are foods (hereinafter referred to as filled foods) produced by filling a container with a material such as tofu, mizuyokan, and pudding, sealing and heat-solidifying the material.
For example, when the filled food is tofu, the container is filled with a tofu material charged with soymilk and a coagulant and sealed, and the container filled with the tofu material is heated at 60 to 100 degrees to produce a filled tofu. (For example, see Patent Document 1).

Metal containers, synthetic resin containers, paper containers, and the like are known as containers used for filled foods such as filled tofu, but paper containers have become popular due to ease of disposal after use and recycling characteristics. ing. As a paper container for sealingly storing food, from the outer surface side to the inner surface side, a thermoplastic resin layer mainly composed of polyethylene resin, a paper base layer, a thermoplastic resin layer mainly composed of polyethylene resin, a barrier layer. There is a paper container formed of a paper container material having a thermoplastic resin layer containing a polyethylene resin as a main component as an innermost layer through the innermost layer (for example, see Patent Document 2).
However, when a paper container formed of the paper container material described in Patent Literature 2 is used as a container for a filled food, the solidified food in the container and a thermoplastic resin mainly composed of a polyethylene resin to be the inner surface of the container are used. There was a possibility that the food was poorly detached from the layer, and the food adhered to the inner surface during take-out, making it difficult to take out or partly missing.

A polyolefin resin composition in which a polyolefin-based resin or a compounding agent selected from a polyhydric alcohol or a derivative thereof and a polyoxyethylene derivative is added to a polyolefin-based resin as one that improves the detachability between the inner surface of the container and the food solidified in the container. It has been proposed (for example, see Patent Document 3).
If the technology described in Patent Document 3 is applied to the innermost layer of the paper container material described in Patent Document 2, the separation between the inner surface of the paper container and the food is improved, and the food can be easily removed from the paper container. Can be taken out.

As an example of applying the technology described in Patent Document 3 to the innermost layer of the paper container material described in Patent Document 2, as an example, a thermoplastic resin mainly composed of a polyethylene resin constituting the innermost layer of the above-described paper container material It is conceivable that the innermost layer is formed by laminating a polyethylene resin film to which a compounding agent selected from a polyhydric alcohol or a derivative thereof and a polyoxyethylene derivative is added.
However, when the paper container formed from the paper container material thus obtained is used as a container for a filled food, the polyethylene resin layer serving as the innermost layer to which the compounding agent is added, and the polyethylene resin inside the main component are mainly used. In some cases, peeling occurs between the layer and the thermoplastic resin layer, and the content liquid leaks.

JP 2014-187975 A JP 2004-17984 A JP-A-7-62163

  The peeling that occurs between the innermost polyethylene resin layer to which the above-mentioned compounding agent is added and the thermoplastic resin layer containing polyethylene resin as a main component inside the inner layer is filled with a food material in a container and sealed. When heated and heated, the compounding agent added to the innermost polyethylene resin layer elutes and migrates between the inside and the thermoplastic resin layer mainly containing the polyethylene resin. all right.

  The present inventors have found that the compounding agent eluted from the innermost polyethylene resin layer to which the compounding agent has been added is prevented from migrating between the inside and the thermoplastic resin layer containing polyethylene resin as a main component. As a result of repeated studies to obtain a paper container for food, polyethylene resin and polypropylene resin were interposed between the polyethylene resin layer containing the compounding agent and the thermoplastic resin layer containing polyethylene resin as the main component inside. By interposing the mixed thermoplastic resin layer, it was found that the compound eluted from the polyethylene resin layer to which the compound was added did not migrate between the inside and the thermoplastic resin layer containing polyethylene resin as a main component. Thus, the present invention has been completed.

  An object of the present invention is to provide a filled food paper container which has good detachability from food, prevents the innermost layer from peeling off during the manufacturing process, and does not cause leakage of the content liquid.

In order to achieve the above object, a filled food paper container according to the invention of claim 1,
From the outer surface side to the inner surface side, a thermoplastic resin layer (A layer) mainly composed of polyethylene resin, a paper base layer (B layer), a thermoplastic resin layer mainly composed of polyethylene resin (C layer), a barrier layer (D layer), an adhesive layer (E layer) containing ethylene-methacrylic acid copolymer resin as a main component, a thermoplastic resin layer (F layer) containing polyethylene resin as a main component, and a heat mixture of polyethylene resin and polypropylene resin. A container material having a thermoplastic resin layer (G layer) and a thermoplastic resin layer (H layer) obtained by adding a compounding agent selected from a polyhydric alcohol or a derivative thereof and a polyoxyethylene derivative to a polyolefin resin; the mixing ratio of the polyethylene resin and polypropylene resin constituting the resin layer (G layer) is 3: 7 to 4: 6, the added the to the thermoplastic resin layer (H layer) The amount of the mixture may be equal to 5% to 20%.

The filled food paper container according to the invention according to claim 2 is characterized in that the polyolefin resin constituting the thermoplastic resin layer (H layer) according to claim 1 is a linear low-density polyethylene resin. Features.

According to the filled molten paper container of the first aspect, the innermost layer of the paper container material is made of a thermoplastic resin layer (H) obtained by adding a compound selected from polyhydric alcohol or a derivative thereof and a polyoxyethylene derivative to a polyolefin resin. Layer), and the compounding amount of the compounding agent added to the thermoplastic resin layer (H layer) is 5% to 20%, so that the inner surface of the paper container is easily detached from food and the paper container is easily separated. Can be easily taken out of the food.
Further, a thermoplastic resin layer (G layer) in which a polyethylene resin and a polypropylene resin are mixed is provided between a thermoplastic resin layer (F layer) containing polyethylene resin as a main component inside the thermoplastic resin layer (H layer). Since the mixing ratio of the polyethylene resin and the polypropylene resin constituting the thermoplastic resin layer (G layer) was 3: 7 to 4: 6 with the interposed laminated structure, the container was filled with food materials such as tofu. During the manufacturing process of sealing and heat-solidifying, the elution of the compounding agent from the thermoplastic resin layer (H layer) as the innermost layer is suppressed by the thermoplastic resin layer (G layer), and the thermoplastic resin layer (G layer) (F layer) can be prevented, and the occurrence of peeling of the thermoplastic resin layer (H layer) from the thermoplastic resin layer (F layer) can be prevented. To get a filled food paper container Can.

According to the filled food paper container of the second aspect, since the polyethylene resin constituting the thermoplastic resin layer (H layer) of the first aspect is a linear low-density polyethylene resin, strong adhesion is achieved. Strength, heat resistance and pinhole resistance can be obtained .

It is explanatory drawing which shows an example of the laminated structure of the container material which forms the filling food paper container which concerns on this invention.

Hereinafter, an example of an embodiment of a filled food paper container according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is an explanatory view showing an example of a laminated structure of container materials forming a filled food paper container according to the present invention.
The filled food paper container of this example has a thermoplastic resin layer (A layer) containing polyethylene resin as a main component, a paper base layer (B layer), and a thermoplastic resin containing polyethylene resin as a main component from the outer surface to the inner surface. A resin layer (C layer), a barrier layer (D layer), an adhesive layer (E layer) mainly composed of an ethylene / methacrylic acid copolymer resin, a thermoplastic resin layer mainly composed of a polyethylene resin (F layer), thermoplastic resin layer obtained by mixing a polyethylene resin and polypropylene resin (G layer), a thermoplastic resin layer with the addition of compounding agent selected port Li olefin resin from polyhydric alcohol or a derivative thereof, and polyoxyethylene derivatives (H layer) It is formed of a container material provided with:

Of the above laminated structure, a thermoplastic resin layer (A layer) mainly composed of polyethylene resin, a paper base layer (B layer), a thermoplastic resin layer mainly composed of polyethylene resin (C layer), and a barrier layer (D layer), an adhesive layer (E layer) containing ethylene-methacrylic acid copolymer resin as a main component, and a thermoplastic resin layer (F layer) containing polyethylene resin as a main component. There is no difference from the container material used for the container.
In this example, the thermoplastic resin layer (C layer) has a linear low-density polyethylene resin (LLDPE) as a component, and the thermoplastic resin layer (F layer) has a high-pressure method low-density polyethylene resin (LDPE) as a component. . Further, an aluminum foil is used as a barrier layer (D layer).

The container material forming the filled food paper container according to the present invention comprises a thermoplastic resin layer (G layer) on the outside (inside of the container) of the thermoplastic resin layer (F layer) of the laminated structure laminated as described above. ), And a thermoplastic resin layer (H layer).
The thermoplastic resin layer (G layer) laminated outside the thermoplastic resin layer (F layer) contains a thermoplastic resin obtained by mixing a polyethylene resin and a polypropylene resin.
The mixing ratio of polyethylene resin: polypropylene resin is preferably 3: 7 to 4: 6. When the proportion of the polyethylene resin is 4 or more, the suppression of the compounding agent eluted from the thermoplastic resin layer (H layer) described below decreases, and when the proportion of the polyethylene resin is 3 or less, the adhesiveness decreases.

The thermoplastic resin layer (H layer) constitutes the innermost layer (inner surface of the container), in this example, a linear low density polyethylene resin (LLDPE) is a component, linear low density polyethylene To the resin (LLDPE) , a compounding agent selected from a polyhydric alcohol or a derivative thereof and a polyoxyethylene derivative is added. The amount of the compounding agent added is 5 to 20%, preferably 10%. If the amount of the compounding agent is less than 5%, the inner surface of the paper container, that is, the releasability of the thermoplastic resin layer (H layer) from the food decreases, and if it exceeds 20%, the thermoplastic resin layer (H Layer) has reduced adhesion.

According to the thus constructed packed food paper container formed of a container material having a layered structure as described above, the innermost layer polyhydric alcohol or the port Li olefin resin paper container material for the inner surface of the paper container Since the thermoplastic resin layer (H layer) to which the compounding agent selected from the derivative and the polyoxyethylene derivative is added, the detachability between the inner surface of the paper container and the food is improved, and the food can be easily taken out from the paper container.
Further, a thermoplastic resin layer (G layer) in which a polyethylene resin and a polypropylene resin are mixed is interposed between a thermoplastic resin layer (F layer) containing polyethylene resin as a main component inside the thermoplastic resin layer (H layer). In the manufacturing process of filling containers with food material such as tofu, sealing and heat-solidifying, the compounding agent elutes from the innermost thermoplastic resin layer (H layer) because of the laminated structure Is suppressed by the thermoplastic resin layer (G layer), the migration to the thermoplastic resin layer (F layer) can be prevented, and the thermoplastic resin layer (H layer) from the thermoplastic resin layer (F layer) can be prevented. Can be prevented from peeling off.

Hereinafter, examples of the filled food paper container according to the present invention and comparative examples will be described, and the test results of peelability and detachment will be described.
<Example>
Example 1
From the outer surface side to the inner surface side, thermoplastic resin layer (A layer) mainly composed of polyethylene resin, paper base layer (B layer), thermoplastic resin mainly composed of linear low-density polyethylene resin (LLDPE) Layer (C layer), barrier layer (D layer), adhesive layer (E layer) mainly composed of ethylene-methacrylic acid copolymer resin, thermoplastic resin mainly composed of high-pressure low-density polyethylene resin (LDPE) layer (F layer), 4 a polyethylene resin and a polypropylene resin: 6 thermoplastic resin layer mixed in a ratio of (G layer), the formulation chosen Po Li olefin resin from polyhydric alcohol or a derivative thereof, and polyoxyethylene derivatives A paper container was formed from a container material provided with a thermoplastic resin layer (H layer) containing a high-pressure method low-density polyethylene resin (LDPE) containing 5% of an agent.
Example 2
A polyethylene container and a polypropylene resin in the thermoplastic resin layer (G layer) of Example 1 were mixed at a ratio of 3: 7, and a paper container was formed using the same container material provided with the thermoplastic resin layer as in Example 1 except for the above. did.
Example 3
Was added 20% as an additive amount of the compounding agent selected from polyhydric alcohols or their derivatives and polyoxyethylene derivatives Po Li olefinic resin of the thermoplastic resin layer of Example 1 (H layer), otherwise Example 1 A paper container was formed from a container material provided with the same thermoplastic resin layer as in Example 1.
<Comparative example>
Comparative Example 1
A thermoplastic resin layer composed of the same laminated structure as in Example 1 and corresponding to the G layer of Example 1 was used as a thermoplastic resin layer in which a polyethylene resin was mixed at a mixing ratio of polyethylene resin and polypropylene resin of more than 4 in a mixing ratio. A paper container was formed by using the same thermoplastic resin layer as in Example 1 for the other thermoplastic resin layers.
Comparative Example 2
A thermoplastic resin layer composed of the same laminated structure as in Example 1 and corresponding to the G layer in Example 1 was used as a thermoplastic resin layer in which polyethylene resin was mixed at a mixing ratio of polyethylene resin and polypropylene resin of less than 3 A paper container was formed by using the same thermoplastic resin layer as in Example 1 for the other thermoplastic resin layers.
Comparative Example 3
Example 1 and formed of the same laminate structure, choosing a thermoplastic resin layer corresponding to the thermoplastic resin layer of Example 1 (H layer) on port Li olefin resin from polyhydric alcohol or a derivative thereof, and polyoxyethylene derivatives A paper container was formed from a container material provided with the same thermoplastic resin layer as in Example 1 except that the thermoplastic resin layer was added with 4% as an additive amount of the compounding agent to be added.

<Test items, test methods and test results>
The paper containers shown in the above Examples 1, 2, 3 and Comparative Examples 1, 2, 3 are filled with soymilk and bittern as a material such as tofu using a filling machine, sealed, heated at 90 ° for 30 minutes, and filled with tofu. To manufacture.
The filled tofu prepared using the paper containers shown in Examples 1, 2, and 3 and Comparative Examples 1, 2, and 3 was used as Sample 1 in a 35 ° C. environment for 5 days and as Sample 2 as 35 The sample is stored for 13 days in a temperature environment of 13 degrees, as a sample 3 for 5 days in a temperature environment of 55 degrees, and as a sample 4 for 12 days in a temperature environment of 55 degrees.
[Removability test]
〇Test method (A) After the storage period has elapsed, take out the tofu from samples 1, 2, 3, and 4, cut out the container material, and visually check the innermost layer from the thermoplastic resin layer (F layer) The peeling of the resin layer (G layer) and the thermoplastic resin layer (H layer) was confirmed.
(B) Samples 1, 2, 3, and 4 from which tofu was removed were cut into strips in the direction of flow, immersed in acetic acid, and the immersed portions were rubbed or stretched to apply a thermoplastic resin. The peeling of the innermost layer from the layer (F layer) was promoted.
〇Test results According to test method (A);
No peeling of the innermost layer from the thermoplastic resin layer (F layer) was confirmed from any of Samples 1, 2, 3, and 4 in Examples 1, 2, and 3.
The peeling of the innermost layer from the thermoplastic resin layer (F layer) was confirmed from any of the samples 1, 2, 3, and 4 in Comparative Examples 1 and 2, but from Comparative Example 3, the thermoplastic resin layer (F No peeling of the innermost layer from the layer was confirmed.
According to test method (B):
In all of Samples 1, 2, 3, and 4 in Examples 1, 2, and 3, the innermost layer did not peel off from the thermoplastic resin layer (F layer).
In all of Samples 1, 2, 3, and 4 in Comparative Examples 1 and 2, the innermost layer was separated from the thermoplastic resin layer (F layer), but from Comparative Example 3, the innermost layer was separated from the thermoplastic resin layer (F layer). Did not peel off.
[Separation test]
〇Test method After the storage period has elapsed, samples 1, 2, 3, and 4 are opened, and the tofu is removed from the container upside down, and the separation from the inner surface of the paper container, that is, the thermoplastic resin layer (H layer) is confirmed. Was done.
(4) Test results Samples 1, 2, 3, and 4 in Examples 1, 2, and 3 all had good separation from the tofu and the inner surface of the paper container.
All of Samples 1, 2, 3, and 4 in Comparative Examples 1 and 2 had good separation from the tofu and the inner surface of the paper container. Also, the separation between the tofu and the inner surface of the paper container was poor.

Claims (2)

From the outer surface side to the inner surface side, a thermoplastic resin layer (A layer) mainly composed of polyethylene resin, a paper base layer (B layer), a thermoplastic resin layer mainly composed of polyethylene resin (C layer), a barrier layer (D layer), an adhesive layer (E layer) containing ethylene-methacrylic acid copolymer resin as a main component, a thermoplastic resin layer (F layer) containing polyethylene resin as a main component, and a heat mixture of polyethylene resin and polypropylene resin. A container material having a thermoplastic resin layer (G layer) and a thermoplastic resin layer (H layer) obtained by adding a compounding agent selected from a polyhydric alcohol or a derivative thereof and a polyoxyethylene derivative to a polyolefin resin;
The mixing ratio of the polyethylene resin and the polypropylene resin constituting the thermoplastic resin layer (G layer) is 3: 7 to 4: 6,
A filled food paper container, wherein the compounding amount of the compounding agent added to the thermoplastic resin layer (H layer) is 5% to 20%. The filled food paper container according to claim 1, wherein the polyolefin-based resin constituting the thermoplastic resin layer (H layer) is a linear low-density polyethylene resin .

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