JP2006027205A - Peelable sheet for food - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a process of baking a releasing agent at a high temperature after applying the releasing agent in the manufacturing processes of a peelable sheet for food unnecessary, the peelable sheet being used for wrapping paper of fast food, cooking paper for baking bread, cake or the like, wrapping paper for wrapping butter, margarine or the like, and the like, to make a water component and an oil component emerging from the foods more permeate by controlling permeation of the releasing agent itself into the paper during applying the releasing agent and reducing the applying amount of the releasing agent, and to facilitate recycling as recycled paper. <P>SOLUTION: A peelable layer 3 of an aqueous releasing agent obtained by mixing at least polyvinyl alcohol, an aqueous silicone and an aqueous catalyst is applied to at least one surface of a fibrous base material sheet 1 mainly composed of paper or a pulp-based material. A permeation preventing layer 2 of polyvinyl alcohol having a saponification degree of 85 to 100% is mounted between the fibrous base material sheet 1 and the peelable layer 3 to prevent the permeation of the aqueous releasing agent into the fibrous base material sheet 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is mainly used in the field of food packaging, and is a sheet or film for wrapping or placing foods, such as fast food wrapping paper, cooking paper for baking bread, cakes, etc. The present invention relates to a food release sheet used as a wrapping paper for wrapping butter, margarine or the like.

  Food sheets such as wrapping paper for fast food for wrapping and placing foods, cooking paper used for baking bread, cakes, etc., and wrapping paper for wrapping butter, etc. It is necessary to have a function to prevent oil from leaking out, and it has a function to absorb moisture and oil from the food and easily peel from the sheet without the food catching on the sheet. It is necessary.

  As a technology related to food release sheets such as wrapping paper and cooking paper, Japanese Utility Model Publication No. 7-17089 is subjected to corona treatment after silicone coating to improve breathability and easy peelability. There is a description about paper, and JP-A-9-158096 relates to a partially coated release paper in which an uneven surface is formed by embossing the surface of the paper and a release agent layer is provided only on the top surface of the convex surface. In addition, in JP-A-8-109358, in order to prevent moisture and oil from penetrating into the paper, an aluminum foil is laminated on the paper, a release agent is applied to the surface of the aluminum foil, and pinhole free In addition, there is a description of a release paper that is easy to peel and prevents penetration.

  Conventionally, food release sheets that are generally used include papers such as glassine paper and parchment paper, but the paper itself is expensive and requires special production equipment, such as silicone resin on the paper. In general, it is necessary to bake at a high temperature of 150 ° C. to 300 ° C., and the mechanical equipment of the coating machine (coater) needs to be dedicated. Become.

  Furthermore, when a release agent such as silicone resin is applied to the paper (coating), the release agent permeates the paper, so a large amount of expensive release agent is used, and there is a problem of high cost. Since there is a large amount of coating, there is a high possibility that excess moisture and oil from the food will accumulate on the release agent layer of the food release sheet and the food will stick.

  Therefore, as the improved food release sheet, there is a steamed food release paper described in the above-mentioned Japanese Utility Model Publication No. Hei 7-17089, but the cost increases due to the large amount of silicone resin applied to the paper. The partially coated release paper described in Japanese Patent Application Laid-Open No. 9-158096 is expensive because it requires embossing, and a special technique is also required for coating a release agent.

  Also, a release paper in which an aluminum foil is laminated on a paper as described in JP-A-8-109358 and a release agent is coated on the surface of the aluminum foil is difficult to recover as a recycled paper because the aluminum foil is used. In addition, since a baking process is required for silicone coating, a dedicated coating machine is required, which increases the cost of mechanical equipment for coating.

The known patent documents are described below.
Utility Model 7-17089 Japanese Patent Laid-Open No. 9-158096 JP-A-8-109358

  The present invention is mainly used in the field of food packaging, and is a sheet or film for wrapping or placing foods, such as fast food wrapping paper, cooking paper for baking bread, cakes, etc. , A food release sheet used as wrapping paper for wrapping butter, margarine, etc., which eliminates the need for a high-temperature baking process of the release agent after the release agent coating in the production stage, It is to suppress the penetration into paper and reduce the coating amount of the release agent to improve the penetration of moisture and oil from foods and facilitate the collection as recycled paper.

  The invention according to claim 1 of the present invention is a release property by an aqueous release agent in which at least polyvinyl alcohol, an aqueous silicone, and an aqueous catalyst are mixed on at least one surface of a fiber structure base sheet 1 mainly composed of paper or a pulp material. Layer 3 is applied, and between the fiber structure base sheet 1 and the peelable layer 3, impregnation of the aqueous release agent into the fiber structure base sheet 1 with polyvinyl alcohol having a saponification degree of 85 to 100%. A release sheet for food, which is provided with a permeation preventing treatment layer 2 for suppression.

  The invention according to claim 2 of the present invention is the release sheet for food according to claim 1, wherein the average polymerization degree of polyvinyl alcohol of the treatment layer 2 is 500 to 3000. It is.

  The invention according to claim 3 of the present invention is characterized in that in the food release sheet according to claim 1 or 2, the saponification degree of polyvinyl alcohol in the aqueous release agent of the peelable layer 3 is 80 to 100%. This is a food release sheet.

  The invention according to claim 4 of the present invention is the release sheet for food according to any one of claims 1 to 3, wherein the average degree of polymerization of polyvinyl alcohol in the aqueous release agent of the peelable layer 3 is 500 to 500. It is a release sheet for foodstuffs characterized by being 2500.

  The invention according to claim 5 of the present invention is the food release sheet according to any one of claims 1 to 4, wherein the fiber structure base sheet 1 contains at least a sizing agent. This is a food release sheet.

  The invention according to claim 6 of the present invention is characterized in that in the food release sheet according to any one of claims 1 to 5, the fiber structure base sheet 1 contains at least starch. This is a food release sheet.

  The invention according to claim 7 of the present invention is the food release sheet according to any one of claims 1 to 6, wherein the aqueous catalyst contained in the aqueous release agent of the peelable layer 3 contains at least platinum. It is a release sheet for foods characterized by being made.

The invention according to claim 8 of the present invention is the release sheet for food according to any one of claims 1 to 7, wherein the coating amount of the aqueous release agent of the peelable layer 3 is 0.1 to 2 g. It is a release sheet for food, characterized by being / m ² dry.

  According to the food release sheet of the present invention, since the penetration preventing layer 2 with polyvinyl alcohol having a saponification degree of 85 to 100% is provided between the fiber structure base sheet 1 and the peelable layer 3, Infiltration of the aqueous release agent into the fiber structure substrate sheet 1 at the coating stage of the peelable layer 3 is suppressed, and the amount of aqueous release agent used for forming the peelable layer 3 is greatly reduced. it can.

  Moreover, since the coating usage of the aqueous release agent used for coating formation of the peelable layer 3 can be greatly reduced, the film thickness of the peelable layer 3 applied to the fiber structure substrate sheet 1 is reduced. Therefore, moisture and oil can penetrate well into the fiber structure base sheet 1 side through the peelable layer 3, and the occurrence of stickiness due to moisture and oil from the foods wrapped in the food release sheet Can be prevented.

  Further, since the polyvinyl alcohol having a saponification degree of 85 to 100% is used for the soaking prevention treatment layer 2, the fiber structure base sheet 1 coated with the treatment layer 2 or a papermaking process is used. For the fiber structure base sheet 1 coated in the stage, water resistance, oil resistance and breathability can be imparted, and since polyvinyl alcohol having a saponification degree within the above range is used, The coating property and coating quality of polyvinyl alcohol on the fiber structure base sheet 1 after papermaking are stable, and the coating productivity is also good.

  An embodiment of a food release sheet according to the present invention will be described in detail below in accordance with the laminated sectional view of the food release sheet shown in FIG.

  As shown in FIG. 1, the food release sheet of the present invention is provided with a permeation preventing treatment layer 2 and a peelable layer 3 in this order on the surface of a fiber structure base sheet 1.

  The fiber structure base sheet 1 is a fiber structure mainly composed of paper or pulp-based material, chemical pulp such as hardwood bleached kraft pulp, softwood bleached kraft pulp, mechanical pulp such as GP, RGP, TMP, and these Is a base paper made from paper as a raw material.

  These base papers include high-quality paper, medium-quality paper, glossy paper, kraft paper, and other acidic paper produced by known long-net multi-cylinder paper machines, long-net Yankee-type paper machines, circular net paper machines, etc. Paper, and alkaline paper.

  The base paper may contain paper making aids such as paper strength enhancers, sizing agents, fillers, yield improvers and the like.

  The infiltration prevention treatment layer 2 is formed by applying a water-soluble resin to the surface of the fiber structure of the fiber structure base sheet 1, and the exfoliation agent 3 in the exfoliation layer 3 to be applied and formed later is infiltrated. As shown in FIG. 1, the permeation prevention treatment layer 2 is a treatment layer 2 coated to prevent the permeation prevention treatment layer 2 in a state of slightly entering the fiber structure on the surface of the fiber structure base sheet 1. The infiltrating layer 2a is laminated and is coated with polyvinyl alcohol (water-soluble resin) having a saponification degree of 80 to 100% or 85 to 100%. It is preferable because it can easily provide a function of preventing the penetration of the release agent and imparting oil resistance and air permeability to the fiber structure itself of the fiber structure base sheet 1.

In addition, the polyvinyl alcohol used for the coating formation of the soaking prevention treatment layer 2 has an average polymerization degree of 500 to 3000. For example, the surface of the fiber structure base sheet 1 may be internally added by papermaking or papermaking inline coating. When forming the infiltration prevention treatment layer 2 with
From the viewpoint of forming treatment, it is preferable to use one having an average degree of polymerization of 500 to 2400.

  Further, as the polyvinyl alcohol used for coating formation of the soaking prevention treatment layer 2, modified ones (various modified polyvinyl alcohols such as carboxyl modified, silanol modified, acrylamide modified) can be preferably used, and these polyvinyl alcohols can be used. Alcohol can exhibit various performances such as permeation prevention, oil resistance and breathability of the permeation preventive treatment layer 2 in accordance with the various paper properties of the fiber structure base sheet 1 to be coated and the properties of the fiber structure. It can be appropriately selected and used depending on the combination.

  The peelable layer 3 applied to the surface of the fiber structure base sheet 1 via the soaking prevention treatment layer 2 does not stick to the food itself when wrapped up, so that it can be easily peeled off. It is formed by applying an aqueous release agent that is a mixture of at least polyvinyl alcohol, an aqueous silicone, and an aqueous catalyst.

  When the release layer 3 is coated using a fluororesin as a release agent, gas may be generated by heating at 100 ° C. or higher, and relatively expensive tetrafluoroethylene (ethylene tetrafluoride). ) When a resin (Teflon (registered trademark)) is applied using a release agent, the cost increases. Therefore, it is appropriate to apply a resin using a silicone resin release agent.

  Generally, silicone resin-based release agents have poor fixability (fixability), and a high-viscosity silicone resin is applied to the base sheet surface using a special coating machine (coater), and then baked to fix it. The peelable layer 3 in the present invention is prepared by mixing an aqueous silicone resin (in which a silicone resin is dispersed in an aqueous solvent, an emulsion type silicone resin) with polyvinyl alcohol, and for this in a fixing reaction. By applying an aqueous release agent added with a metal catalyst as a contributing aqueous catalyst (fixing reaction catalyst) to the surface of the fiber structure base sheet 1 through the soaking prevention treatment layer 2, the aqueous release agent in polyvinyl alcohol The release layer 3 is formed on the surface of the fiber structure base sheet 1 by reacting and fixing the silicone resin through the catalyst during drying. That. In addition, platinum, titanium, chromium or the like can be used as the metal catalyst, but platinum and titanium are preferable from the viewpoint of food safety and hygiene.

  As the polyvinyl alcohol in the aqueous release agent, those having a saponification degree of 80 to 100% and an average polymerization degree of about 500 to 2500 can be used, and modified polyvinyl alcohol (carboxyl modified, silanol) Various modified polyvinyl alcohols such as modified and acrylamide-modified) can also be preferably used, but in addition to these physical properties, they are appropriately determined depending on the mixing ratio with the silicone resin in the aqueous release agent.

  As the aqueous release agent, a normal aqueous system for applying an aqueous resin solution by mixing an aqueous silicone resin with polyvinyl alcohol and using an aqueous release agent to which a metal catalyst is added as an aqueous catalyst. The coating process can be facilitated by a coating machine (aqueous coater). The water-based coating machines include size press coaters, gate roll coaters, blade coaters, air knife coaters, rod coaters, bar coaters, curtain coaters, die slot coaters, gravure coaters, reverse roll coaters, dipping machines, and various printing machines. and so on.

  The release sheet for food according to the present invention is manufactured by coating the surface of the fiber structure base sheet 1 with the permeation preventive treatment layer 2 in advance and then applying the release layer 3 with a silicone resin-based aqueous release agent. Therefore, the release layer 3 is difficult to soak into the sheet layer of the fiber structure base sheet 1 during the production of the coating, and the easy release property by the release layer 3 of the good silicone resin-based aqueous release agent is obtained. It is easy to be done. Therefore, it is possible to reduce the film thickness of the coating, reduce the amount of coating of the expensive silicone resin-based aqueous release agent, and manufacture an inexpensive food release sheet.

  Moreover, the sizing agent may be contained in the fiber structure of the fiber structure base sheet 1 of the food release sheet of the present invention. By including a sizing agent in the fiber structure, the oil resistance and water resistance of the soaking prevention treatment layer 2 by polyvinyl alcohol are improved, and the silicone resin-based release coated on the soaking prevention treatment layer 2 is also achieved. The peelability of the conductive layer 3 is also good.

  This is because if the sizing agent is contained in the fiber structure, the penetration of the coating agent into the fiber structure tends to be delayed. This is because a uniform and flat surface film appears on the outermost surface of the structure. Therefore, when the surface film of the coating agent formed on the surface of the fiber structure is a thin film, oil permeability and water resistance as well as air permeability can be obtained.

  Examples of the sizing agent include glue, casein, starch, modified starch, starch derivatives, algin, paraffin emulsion, synthetic rubber emulsion, silicon resin, fluorine resin, urea resin, styrene-maleic acid copolymer, polyvinyl acetate, poly Any one or a mixture of two or more of acrylamide, amine polymer, colloidal silicic acid, ketene dimer, styrene-acrylic copolymer and the like can be used.

  Moreover, the fiber structure of the said fiber structure base material sheet 1 of the peeling sheet for foodstuffs of this invention may contain starch. By including starch in the fiber structure, oil resistance is further improved, oil resistance and water resistance by the infiltration treatment layer 2 of the polyvinyl alcohol can be supplemented, and oil resistance at high temperatures can be further improved. it can.

  As starch used here, unmodified starch, ether modified, ester modified, acetal modified, formal modified, urethane modified, metal alcohol modified, dialdehyde modified, enzyme modified, phosphate modified, hydroxyethyl modified, cationic starch, etc. Various modified starches can be used.

  The aqueous release agent for coating and forming the peelable layer 3 is an aqueous reaction for rapidly solidifying, drying and fixing the emulsion-based silicone resin that is the main component of the aqueous release agent. The catalyst is contained, and drying of the silicone resin of the aqueous release agent coated on the infiltration preventing treatment layer 2 of the fiber structure base sheet 1 and the adsorption of the base sheet 1 to the fiber structure are very short. The drying of the peelable layer 3 can be completed in a drying oven (heating oven) of a normal coating machine (coater).

  Therefore, the production capacity of the coating treatment of the peelable layer 3 is drastically improved. In particular, by using platinum as an aqueous reaction catalyst, the silicone resin of the aqueous release agent is dried and the fiber structure base sheet 1 is used. Can be adsorbed onto the fiber structure in a very short time, and the production capacity of the coating treatment of the peelable layer 3 is remarkably improved.

Moreover, the coating amount of the aqueous release agent for coating and forming the peelable layer 3 is not particularly limited in the present invention, but for example, 0.1 to 2.0 g / m ² dry (g / M ² dry; coating weight after drying per unit area) is appropriate, preferably 0.5 g / m ^{2 to} 1.5 g / m ² dry.

For example, if the coating amount of the aqueous release agent is less than 0.1 g / m ² , sufficient peelability by the silicone resin in the aqueous release agent cannot be obtained, and more than 2.0 g / m ^2. Then, it is conceivable that the reactivity of drying and fixing of the silicone resin in the aqueous release agent becomes worse, and problems such as blocking of the release layer 3 occur. Further, when the coating amount of the aqueous release agent is excessive, it is disadvantageous in terms of coating cost, and therefore an appropriate coating amount is required.

  Specific examples of the food release sheet of the present invention will be described below.

<Example 1>
A high-quality paper having a basis weight of 45 g / m ² using virgin pulp is used as the fiber structure base sheet 1, and the average degree of polymerization is 500 to 3000 and the degree of saponification is 85 to 100% on one side of the fiber structure base sheet 1. Polyvinyl alcohol is applied at 0.5 g / m ² to form a permeation preventive treatment layer 2, and further, polyvinyl alcohol (average polymerization degree is 500 to 2500, saponification degree is 80 to 100%) on the treatment layer 2. : Aqueous silicone resin: A platinum release catalyst prepared by blending at a weight ratio of 90: 9: 1 was coated with an aqueous release agent at a coating amount of 1 g / m ² · dry. The peelable layer 3 was formed by drying for 30 seconds, and the food release sheet of the present invention comprising the fiber structure base sheet 1, the soaking prevention treatment layer 2, and the peelable layer 3 was obtained.

<Example 2>
In the same manner as in Example 1 except that a high-quality paper having a basis weight of 45 g / m ² using virgin pulp blended with starch as a sizing agent was used as the fiber structure base sheet 1 in Example 1 above. A release sheet for food of the present invention comprising the structural substrate sheet 1, the soaking prevention treatment layer 2, and the peelable layer 3 was obtained.

<Comparative Example 1>
A high-quality paper having a basis weight of 45 g / m ² using virgin pulp is used as the fiber structure base sheet 1, and the permeation prevention treatment layer 2 is omitted on one side of the fiber structure base sheet 1, and polyvinyl alcohol (average polymerization degree) 500-2500, saponification degree 80-100%): aqueous release resin prepared by blending aqueous silicone resin: platinum catalyst at a weight ratio of 90: 9: 1 to a coating amount of 1 g / m ² · dry The peelable layer 3 was formed by drying in an oven at 100 ° C. for 30 seconds to obtain a food release sheet of Comparative Example composed of the fiber structure base sheet 1 and the peelable layer 3.

<Verification test>
Each food release sheet obtained in Example 1, Example 2 and Comparative Example 1 is wrapped with a commercially available cookie mix for making cookies, placed in an oven, and cookies are placed at 200 ° C. for 15 minutes. Baking, oil penetration, and cookie peelability were compared and verified.

<Verification results>
Table 1 below shows the results of comparative verification of the oil penetration and the cookie peelability in the food release sheets obtained in Example 1, Example 2 and Comparative Example 1.

The sectional side view of the peeling sheet for foodstuffs of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fiber structure base material sheet 2 ... Soaking prevention treatment layer 3 ... Release layer

Claims (8)

  At least one surface of a fiber structure base sheet 1 mainly composed of paper or pulp material is coated with a release layer 3 made of an aqueous release agent in which at least polyvinyl alcohol, an aqueous silicone, and an aqueous catalyst are mixed. Between the material sheet 1 and the peelable layer 3, there is provided a soaking prevention treatment layer 2 for suppressing the soaking of the aqueous release agent into the fiber structure base sheet 1 by polyvinyl alcohol having a saponification degree of 85 to 100%. A release sheet for food, characterized in that   The release sheet for food according to claim 1, wherein the average polymerization degree of polyvinyl alcohol in the treatment layer 2 is 500 to 3000.   The release sheet for food according to claim 1 or 2, wherein the saponification degree of polyvinyl alcohol in the aqueous release agent of the release layer 3 is 80 to 100%.   4. The food release sheet according to claim 1, wherein an average polymerization degree of polyvinyl alcohol in the aqueous release agent of the release layer 3 is 500 to 2500. 5.   5. The food release sheet according to claim 1, wherein at least a sizing agent is contained in the fiber structure base sheet 1.   The food release sheet according to any one of claims 1 to 5, wherein the fiber structure base sheet 1 contains at least starch.   A food release sheet, wherein the aqueous catalyst contained in the aqueous release agent of the release layer 3 contains at least platinum, titanium, or chromium. The food release sheet according to any one of claims 1 to 7, wherein a coating amount of the water-based release agent of the peelable layer 3 is 0.1 to ² g / m ² dry.

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