JP2013177198A - Microwave oven heat generating sheet and paper container with microwave oven heat generating sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microwave oven heat generating sheet which can be easily peeled off from food after cooking by heating with a microwave oven even in a food of which surface tightly adheres to a surface of the microwave oven heat generating sheet and to provide a paper container with the microwave oven heat generating sheet.SOLUTION: A microwave oven heat generating sheet is formed by providing peelable paper on a contact surface of food and a sheet-like heat generating base material which generates heat owing to irradiation with microwaves. The peelable paper is formed by sequentially forming a coating layer and a silicon resin layer on a paper layer. The coating layer is a coating layer mainly composed of polyvinyl alcohol or a coating layer mainly composed of polyvinyl alcohol and a copolymer of a polystyrene-acrylic acid ester polymer and polyvinyl alcohol. The microwave oven heat generating sheet is attached to the paper container.

Description

  The present invention relates to a heating sheet for a microwave oven and a paper container with a heating sheet for a microwave oven.

  In recent years, heat generating sheets for microwave ovens have been used in various ways. For example, a popcorn raw material is put in a cup-shaped packaging container and sold, and a consumer uses a microwave oven at home to expand the corn to make popcorn (Patent Document 1).

  Moreover, when foods such as half-cooked grilled rice balls, okonomiyaki, and pizza are cooked with a microwave oven, the surface is burnt and used to obtain a crispy texture (Patent Document 2).

  There are various types of heat generating sheets for microwave ovens. One of them is a thin film of aluminum deposited on a polyethylene terephthalate film, and the heat generating sheet for microwave ovens is bonded to paper via an adhesive on the deposition surface. It has been known. Moreover, the container provided with the bottom face and the side wall using this heat generating sheet | seat for microwave ovens is known, and it is also known to cover this (patent document 3).

  When cooking foods with very high fat and moisture content in a microwave oven using such a heat-generating sheet for microwave ovens, the fats and moisture are raised and collected from the food, and the food reabsorbs the fats and moisture. In order to prevent this from happening, the food heating surface for microwave ovens has been provided with absorbent paper made of materials such as non-woven fabric, Japanese paper, and Western paper on the food contact surface side (patents) Reference 4).

  Known documents are shown below.

Japanese Utility Model Publication No. 7-44733 JP 2008-289692 A Japanese Patent Publication No. 60-15548 Japanese Utility Model Publication No. 63-133088

  In a conventional microwave oven heating sheet, depending on the type of food, for example, it has fluidity, or when heated, it has fluidity and is in close contact with the microwave heating sheet. Later, the food sometimes stuck to the microwave heating sheet and could not be peeled off.

  The present invention has been made in view of the above-described circumstances, and even food that is in close contact with a heating sheet for a microwave oven can be easily peeled off from the food after being cooked in a microwave oven. It is an object of the present invention to provide a heating sheet for a microwave oven that is difficult to cool even if it is left as it is, and a paper container with this heating sheet for a microwave oven.

The invention according to claim 1 of the present invention is a heating sheet for a microwave oven in which a release paper is provided on the surface of the sheet-shaped heating base that generates heat by microwave irradiation in contact with the food,
The release paper is formed by sequentially forming a coating layer and a silicon resin layer on a paper layer,
The coating layer is a coating layer mainly composed of polyvinyl alcohol, or a copolymer of polystyrene-acrylic acid ester polymer and polyvinyl alcohol, and coating composed mainly of polyvinyl alcohol. A heating sheet for a microwave oven, characterized by being a layer.

  The heating sheet for a microwave oven according to the present invention has the above-described configuration and is a coating layer mainly composed of polyvinyl alcohol, or a co-polymer of polystyrene-acrylate polymer and polyvinyl alcohol. Because there is a release paper on which a polymer, a polyvinyl alcohol-based coating layer, and a silicone resin layer are sequentially formed, even when cooked in a microwave using food that adheres to the surface, It can be easily peeled from food. In addition, since the release paper is provided on the surface in contact with the food, the food is difficult to cool even if it is left as it is after heating.

  The invention according to claim 2 of the present invention is characterized in that the heat generating substrate is composed of a substrate film and a metal thin film layer, and the release paper is provided on the surface of the substrate film. This is a heating sheet for microwave ovens.

  In the present invention, since the heat generating substrate is composed of a substrate film and a metal thin film layer, and the release paper is provided on the surface of the substrate film, the production is easy, and the substrate film has food. Even if it is cooked in a microwave oven, it can be easily peeled off from food.

  The invention according to claim 3 of the present invention is characterized in that the heat generating substrate is composed of a substrate film and a metal thin film layer, and the release paper is provided on the surface of the metal thin film layer. This is a heating sheet for a microwave oven.

  In the present invention, the heat-generating substrate is composed of a substrate film and a metal thin film layer, and the release paper is provided on the surface of the metal thin film layer. Therefore, the production is easy, and the food adheres to the metal thin film layer. Even if it is cooked with a microwave oven, it can be easily peeled off from the food, and the metal thin film can be protected.

  The invention according to claim 4 of the present invention is a paper with a heating sheet for a microwave oven, characterized in that the heating sheet for a microwave oven according to any one of claims 1 to 3 is mounted on the inner bottom surface of a paper container. It is a container.

  The paper container with a heat generating sheet for a microwave oven according to the present invention has the heat generating sheet for a microwave oven according to any one of claims 1 to 3 attached to the inner bottom surface of the paper container. Even if it is used for cooking in a microwave oven, it can be easily peeled off from food. In addition, since the release paper is provided on the surface in contact with the food, the food is difficult to cool even if it is left as it is after heating.

  The heat-generating sheet for a microwave oven and the paper container with a heat-generating sheet for a microwave oven of the present invention can be easily peeled off from a food even when used for food that adheres to the surface and cooked in a microwave oven. In addition, since the release paper is provided on the surface in contact with the food, the food is difficult to cool even if it is left as it is after heating.

It is explanatory drawing which showed typically an example of the heat generating sheet for microwave ovens of this invention in the cross section. It is explanatory drawing which showed typically the other example of the heat generating sheet for microwave ovens of this invention in the cross section. (A) It is explanatory drawing which shows the state which folded the container main body of an example of the paper container with the heat generating sheet for microwave ovens of this invention. (B) It is explanatory drawing which shows the state which raised the container main body of an example of the paper container with the heat generating sheet for microwave ovens of this invention. (C) It is explanatory drawing which shows the state which covered the cover to the container main body of an example of the paper container with the heat generating sheet for microwave ovens of this invention. It is explanatory drawing which showed typically an example of the condition when cooking a foodstuff using the heat generating sheet for microwave ovens of this invention. It is explanatory drawing which showed typically a mode that the foodstuff was cooked with the microwave oven using the heat generating sheet for microwave ovens of this invention.

Hereinafter, modes for carrying out the present invention will be described.
FIG. 1 is an explanatory view schematically showing a cross section of an example of a heating sheet for a microwave oven according to the present invention.

  As shown in the cross-sectional view of FIG. 1, the heating sheet 100 for a microwave oven of this example has a release paper 20 laminated on one side of a sheet-like heating base material 10 that generates heat by microwave irradiation. The heat generating base material 10 is provided with a metal thin film layer 12 by vapor deposition on one surface of a base material film 11.

  Further, the release paper 20 has a coating layer 22 and a silicon resin layer 23 sequentially laminated on a paper layer 21. And the surface of the paper layer 21 of the release paper 20 is laminated on the surface of the metal thin film layer 12 of the heat generating substrate 10. A protective layer 30 is provided on the surface of the metal thin film layer 12 of the heat generating substrate 10.

  As the base film 11 used for the heat generating base material 10, a film of polyethylene terephthalate, polypropylene, polymethylpentene, polyetherimide, or the like can be used. The base film 11 has a thickness of about 5 to 25 μm. Although it may be unstretched, a biaxially stretched film is preferable because of its high heat resistance.

As the metal thin film layer 12, a conductive metal thin film is used. In order to heat the food surface so as to be brown, the surface resistivity of the metal thin film layer 12 is preferably set to 62 Ω / cm ² or more.

  The thin film manufacturing method is preferably laminated on the base film 11 by vacuum deposition. As the conductive metal, aluminum, nickel, gold, silver, zinc, platinum or the like can be used, but aluminum is convenient.

  More specifically, a thin film is formed by heating and evaporating in vacuum using metal aluminum as a vapor deposition source, and aggregating it on the surface of a substrate film 11 such as a biaxially stretched polyethylene terephthalate film. The thickness is preferably 2 to 15 nm.

  When the microwave oven is heated depending on the thickness, it is influenced by the time to reach a specific temperature. The thickness of the metal thin film layer 12 can be controlled by measuring the amount of transmitted light because the aluminum vapor-deposited layer is translucent at such a thickness.

For the paper layer 21 of the release paper 20, chemical pulp such as hardwood bleached kraft pulp, softwood bleached kraft pulp, or paper using mechanical pulp such as GP, RGP, TMP, etc. as raw materials can be used. Acidic paper such as medium-quality paper, glossy paper and kraft paper, neutral paper, and alkaline paper can be used. A paper having a basis weight of 30 to 100 g / m ² can be preferably used.

  The coating layer 22 is coated with a coating liquid mainly composed of polyvinyl alcohol, or composed mainly of polyvinyl alcohol and a copolymer of polystyrene-acrylic acid ester polymer and polyvinyl alcohol. Is formed.

  As the polyvinyl alcohol, those having a polymerization degree of 1500 to 18000 can be preferably used. When the degree of polymerization is lower than 1500, the film forming property is poor, and the film formation of the silicon resin layer provided thereon is affected.

  Polystyrene-acrylic acid ester polymer-polyvinyl alcohol copolymer is (1) polystyrene produced by polymerization of styrene monomer, (2) acrylonitrile alcoholic decomposition method, and acrylic produced by propylene direct oxidation method. Acrylic acid ester polymerized products such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, (3) polyvinyl alcohol, or partially or completely ester of unsaturated carboxylic acid, or modified polyvinyl acetate converted to acetoacetate It is a copolymer consisting of three alcohols (1) to (3).

The coating solution thus obtained can be applied by a known coating equipment such as a gate roll coater, a bar coater, a roll coater, an air knife coater, a blade coater to form the coating layer 22. it can. The coating amount is suitably 3 to 7 g / m ² by dry weight.

The silicon resin layer 23 can be provided by applying a silicon resin. As the silicon resin to be used, general organic solvent dilution type, solventless type, emulsion type silicon resin, and the like can be arbitrarily used. The coating amount of the silicon resin is preferably 1 to 2 g / m ^{2, and} when the coating amount is less than 1 g / m ² , the peelability from food is poor.

  The protective layer 30 is provided to protect the metal thin film layer 12 and is not particularly limited as long as it is in the form of a sheet. Paper is preferably used because it is heat resistant and inexpensive, but is not limited to paper, and may be a non-woven fabric or a plastic film.

  Thus, the release paper 20 which provided the coating layer 22 and the silicon resin layer 23 in the paper layer 21 was created, and first, the heating base material 10 in which the metal thin film layer 12 was provided on one side of the base film 11 by vapor deposition. The protective layer 30 is laminated on the surface of the metal thin film layer 12, and then the paper layer 21 surface of the release paper 20 is bonded to the surface of the base film 11, whereby the heat generating sheet 100 for microwave oven is obtained.

  FIG. 2 is an explanatory view schematically showing a cross section of another example of the heat generating sheet for a microwave oven of the present invention.

  As shown in the cross-sectional view of FIG. 2, the heating sheet 200 for the microwave oven of this example is similar to the heating sheet 100 for the microwave oven, with the release paper 20 on one side of the sheet-like heating base material 10 that generates heat by microwave irradiation. Are stacked.

  The heat generating base material 10 is provided with a metal thin film layer 12 by vapor deposition on one surface of a base material film 11. Further, the release paper 20 has a coating layer 22 and a silicon resin layer 23 sequentially laminated on a paper layer 21.

In the heating sheet for microwave oven 200, unlike the heating sheet for microwave oven 100, the paper layer 21 surface of the release paper 20 is laminated on the metal thin film layer 12 surface of the heating base material 10, and the protective layer 30 is provided. Absent. About the material to be used, the same thing as the heating sheet 100 for microwave ovens can be used.

  In order to manufacture the heat generating sheet 200 for a microwave oven, a release paper 20 in which a coating layer 22 and a silicon resin layer 23 are provided on a paper layer 21 is prepared, and a metal thin film layer 12 is formed on one side of the base film 11 by vapor deposition. The heat generating sheet 200 for microwave ovens is obtained by bonding the paper layer 21 surface of the release paper 20 to the surface of the metal thin film layer 12 of the heat generating substrate 10 provided.

  In the above two examples, as the heat generating base material 10, one having a structure in which the metal thin film layer 12 by vapor deposition is provided on one side of the base film 11 is used, but the heat generating base material 10 may not necessarily be this type. . For example, a heat generating base material coated with a coating liquid in which conductive metal powder is dispersed or a heat generating base material using a semiconductor may be used.

  FIG. 3A is an explanatory view showing a folded state of a container body of an example of a paper container with a heat generating sheet for a microwave oven according to the present invention, and FIG. 3B is a diagram of a paper container with a heat generating sheet for a microwave oven according to the present invention. Explanatory drawing which shows the state which raised the container main body of an example, (c) is explanatory drawing which shows the state which covered the cover on the container main body of an example of the paper container with the heat generating sheet for microwave ovens of this invention.

  The paper container 300 with a heating sheet for a microwave oven of this example is configured such that the container body 310 can be folded as shown in FIG. FIG. 3B is an explanatory view showing a state in which the container main body 310 is raised, and the container main body 310 includes a rectangular bottom surface 311 and four side surfaces 312 that stand up from the bottom surface 311. By pushing the crease 313 indicated by the broken line in the figure toward the inside of the container, the four side surfaces 312 can be tilted inward and folded as shown in FIG. On the inner surface of the bottom of the container body 310, a heating sheet 100 or 200 for a microwave oven is provided.

  FIG. 3C shows a state in which a lid 320 is put on a container body 310 of an example of a paper container 300 with a heating sheet for a microwave oven according to the present invention. The lid member 320 is provided with bent pieces on two opposite sides. The bent piece is folded and inserted into the container body, and the container body 310 is covered with the lid 320 as shown in FIG. It is done.

As the material constituting the container body 310 and the lid 320, paper having rigidity is preferably used. The paper used, virgin paper having a basis weight of 200-500 g / ^{m 2,} cardboard, cup base paper, and paperboard such as coated cardboard can be used. As other paper layers to be laminated on the paper substrate, bleached kraft paper, high-quality paper or the like can be used, and as the adhesive resin layer, low density polyethylene resin may be used.

  The paper container with a heat generating sheet for a microwave oven of the present invention is not limited to the above, the container body is composed of a bottom surface and a side surface rising from the bottom surface, the upper end is opened, and the bottom inner surface of the container body is What is necessary is just to provide the heating sheet for microwave ovens. Further, the lid may not be provided.

  Specific examples of the present invention will be described below.

<Example 1>
A 12 μm biaxially stretched polyethylene terephthalate film was prepared as the base film 11, and aluminum was provided as a metal thin film layer 12 on one side so as to have a thickness of 6 nm by vacuum deposition, thereby producing the heat generating base material 10. A metal interleaving paper (basis weight 32 g / m ² ), which is a neutral paper, was laminated by dry lamination on the surface of the metal thin film layer 12 of the heat generating substrate 10 to provide a protective layer 30.

Separately, a glassine paper (basis weight 30.5 g / m ² ) of the paper layer 21 is prepared, and a coating solution of 7% by weight of polyvinyl alcohol having a polymerization degree of 1700 (manufactured by Nippon Synthetic Chemical Industry) is applied to one side thereof. A coating layer 22 having a dry coating amount of 4 g / m ² was provided. Further, a silicon resin was diluted with a solvent and applied to the surface of the coating layer 22 to provide a silicon resin layer 23 having a dry coating amount of 1.5 g / m ² to prepare a release paper 20A.

In order to laminate the paper layer 21 surface of the release paper 20A and the base film 11 surface of the heat-generating base material 10 on which the protective layer 30 is laminated, and to expose the protective layer 30, a paperboard (basis weight 310 g / m ² ) were laminated, and the heating sheet 100 for a microwave oven of Example 1 was produced.

<Example 2>
As release paper 20B, a glassine paper (basis weight 30.5 g / m ² ) having a paper layer 21 is prepared, and 70 parts by weight of polyvinyl alcohol having a polymerization degree of 1700 (manufactured by Nippon Synthetic Chemical Industry) and polystyrene-acrylic are provided on one side thereof. An acid ester polymer-polyvinyl alcohol copolymer (manufactured by Arakawa Chemical Industries) was applied with 30 parts by weight of a 7% by weight coating solution to provide a coating layer 22 having a dry coating amount of 4 g / m ² . Further, a silicon resin was diluted with a solvent and applied to the surface of the coating layer 22 to provide a silicon resin layer 23 having a dry coating amount of 1.5 g / m ² to prepare a release paper 20B.

  A heating sheet 100 for a microwave oven of Example 2 was produced in the same manner as in Example 1 except that this release paper 20B was used instead of the release paper 20A of Example 1.

<Example 3>
The protective layer 30 is not provided on the heat generating substrate 10 of Example 1, and the surface of the metal thin film layer 12 of the heat generating substrate 10 is bonded to the surface of the paper layer 21 of the release paper 20A of Example 1 via an adhesive. Except having laminated | stacked, it carried out similarly to Example 1, and created the heat generating sheet 200 for microwave ovens of Example 3. FIG.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
Comparative Example 1 was carried out in the same manner as in Example 1 except that paperboard (basis weight 310 g / m ² ) was laminated on the heat generating substrate 10 provided with the protective layer 30 of Example 1 without laminating the release paper 20A. A heating sheet for a microwave oven was prepared.

<Comparative example 2>
The electronic of Comparative Example 2 was the same as Example 1 except that glassine paper (basis weight 30.5 g / m ² ) without the coating layer 22 and the silicon resin layer 23 was laminated instead of the release paper 20A. A heating sheet for the range was created.

<Comparative Example 3>
A heating sheet for a microwave oven of Comparative Example 3 was prepared in the same manner as in Example 1 except that a polybutylene terephthalate film 50 μm (Mitsubishi Engineering Plastic Novajuran (registered trademark) 5026) was laminated instead of the release paper 20A. .

<Comparative example 4>
Heat generating sheet for microwave oven of Comparative Example 4 in the same manner as in Example 1 except that 20 μm of silicon resin coated polyethylene terephthalate film (Diafoil (registered trademark) MRF25 manufactured by Mitsubishi Plastics) was laminated instead of release paper 20A It was created.

<Comparative Example 5>
Instead of release paper 20A, polymethylpentene film 50 μm (X-883 made by Tosero)
A heating sheet for microwave oven of Comparative Example 5 was prepared in the same manner as in Example 1 except that was laminated.

<Cooking evaluation>
A commercially available hot cake powder, chicken egg and milk are mixed to make a hot cake dough 4. As shown in FIG. 4, the heating sheet 100 for the microwave oven of Example 1 was placed with the paperboard face down, and a cylindrical ring 5 having an inner diameter of 73 mm made of polyethylene-coated paper was placed thereon. Inside, the prepared hot cake dough 4 was poured and cooked on the turntable 7 of the microwave oven 6 having a high frequency output of 500 W for 1 minute and 30 seconds as shown in FIG.

  Similarly, the cooking sheets for microwave ovens of Examples 2 and 3 and Comparative Examples 1 to 5 were also cooked. These were evaluated for the following items.

(Peelability)
After cooking, the hot cake was peeled off from the heating sheet for microwave oven, and the peelability was evaluated. Easily peeled off was evaluated as ◯, those that did not peel cleanly and that required force to be peeled off were evaluated as △, and those that were severely stuck to the heat generating sheet side for microwave ovens were evaluated as ×. The results are summarized in Table 1.

(Burn eyes)
After cooking, the hot cake was peeled off from the microwave heating sheet, and the degree of scorching on the surface of the hot cake on the microwave heating sheet side was evaluated. Evaluation was made with ○ indicating that the entire surface was moderately burnt, △ when the portion was partially burnt, and × when the portion was not burnt, and the results are summarized in Table 1.

(Moist feeling)
The hot cake after cooking was eaten, and its separation was evaluated. The hot cake contains moderate moisture and is moist and is evaluated as ◯, when the moisture is low and crispy as △, and when the moisture is lost and hard, it is evaluated as ×, and the results are summarized in Table 1. It was.

(Sheet condition)
After cooking, the state of the heating sheet for microwave oven was evaluated. Microwave heat-generating sheets that do not have any damage such as melting or tearing are marked with ◯. Microwave heat-generating sheets that are partly damaged, such as melting or tearing, are marked with △. The results are evaluated as x, and the results are summarized in Table 1.

<Insulation evaluation>
Apart from the evaluation by cooking, the heat retention evaluation was performed for Examples 1 to 3 and Comparative Examples 1 to 5. The iodine solution was added to the starch solution, and the mixed solution obtained by adding agar to the starch solution was dropped on the heating sheets for microwave ovens of Examples 1 to 3 and Comparative Examples 1 to 5, and allowed to cool.

  Each was heated in a microwave oven with a high frequency output of 500 W for 3 minutes. After heating, the mixture was allowed to stand at room temperature, and the time taken for the color of the dropped mixture to change from pale yellow at high temperature to purple at normal temperature was measured.

  A sample that took 40 seconds or more to turn purple was judged to have good heat retaining properties and was marked as ◯. What was within 30 seconds until it was colored purple was judged to be poor in heat retention, and was evaluated as x. The results are summarized in Table 1.

<Comprehensive evaluation>
From the highest priority of the above items, the state of the heating sheet for microwave oven, the peelability, the burntness, the moist feeling, and the heat retaining property were evaluated in this order and evaluated comprehensively. The results are summarized in Table 1.

＜比較結果＞
実施例１から３の電子レンジ用発熱シートは、電子レンジ用発熱シートの状態、剥離性、焦げ目、しっとり感についていずれも良好な結果となり、電子レンジ用発熱シート自体の劣化もなく、ホットケーキの生地を流し込んで加熱調理しても、剥離性が良好であり、出来上がったホットケーキも焦げ目がきちんとついて、食感も良好であった。また、保温性も良好であった。

<Comparison result>
The heat-generating sheet for microwave ovens of Examples 1 to 3 had good results for the state of the heat-generating sheet for microwave ovens, peelability, burnt eyes, moist feeling, no deterioration of the heat-generating sheet for microwave ovens itself, Even when the dough was poured and cooked, the peelability was good, and the finished hot cake was well burnt and textured. Moreover, the heat retention was also good.

  On the other hand, when the heating sheet for microwave ovens of Comparative Examples 1 to 3 was used, the finished hot cake was stuck to the heating sheet for microwave ovens and could not be peeled off, and the peelability was poor.

  Moreover, when the heat generating sheet for microwave ovens of Comparative Example 3 was used, the polybutylene terephthalate film as the surface film was whitened and melted, and the heat generating sheet for microwave ovens was deteriorated by cooking. .

  Comparative Examples 4 and 5 There was no problem with the peelability itself, but the silicon resin-coated polyethylene terephthalate film or polymethylpentene film, which is the film on the surface of the heating sheet for microwave ovens, was partially melted, which is not preferable. It was.

  Moreover, when the heating sheet for microwave ovens of Comparative Examples 3 to 5 was used, there was no paper layer such as a release sheet on the surface in contact with food, so the temperature of the heating base material escaped and the heat retention was poor.

  The above heat generating sheets for microwave ovens of Examples 1 to 3 and Comparative Examples 1 to 5 were attached to the bottom inner surface of the paper box to prepare a paper container with a heat generating sheet for microwave ovens as shown in FIG. However, similar results were obtained.

  As described above, the heat-generating sheet for microwave oven and the paper container with a heat-generating sheet for microwave oven of the present invention can be easily peeled off from food even when cooked in a microwave using food that adheres to the surface. be able to. In addition, deterioration such as melting of the heat generating sheet for the microwave oven due to cooking in the microwave oven does not occur.

DESCRIPTION OF SYMBOLS 100, 200 ... Heat generating sheet 10 for microwave oven ... Heat generating base material 20 ... Release paper 11 ... Base film 12 ... Metal thin film layer 21 ... Paper layer 22 ... Coating Layer 23 ... Silicone resin layer 30 ... Protective layer 300 ... Paper container 310 with heating sheet for microwave oven ... Container body 311 ... Bottom 312 ... Side 313 ... Folded 320 ..Cover material 4 ... Hot cake dough 5 ... Ring 6 ... Microwave oven 7 ... Turntable

Claims (4)

A heating sheet for a microwave oven in which a release paper is provided on the surface of the sheet-like heating substrate that generates heat by microwave irradiation in contact with the food,
The release paper is formed by sequentially forming a coating layer and a silicon resin layer on a paper layer,
The coating layer is a coating layer mainly composed of polyvinyl alcohol, or a copolymer of polystyrene-acrylic acid ester polymer and polyvinyl alcohol, and coating composed mainly of polyvinyl alcohol. A heating sheet for a microwave oven characterized by being a layer.   The heat generating sheet for a microwave oven according to claim 1, wherein the heat generating substrate is composed of a substrate film and a metal thin film layer, and the release paper is provided on the surface of the substrate film.   The heating sheet for a microwave oven according to claim 1, wherein the heating base material is composed of a base film and a metal thin film layer, and the release paper is provided on a surface of the metal thin film layer.   A paper container with a heat generating sheet for a microwave oven, wherein the heat generating sheet for a microwave oven according to any one of claims 1 to 3 is mounted on an inner bottom surface of the paper container.

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