TW201406627A - Packaging sheet for foods, and method for producing packaging sheet for foods - Google Patents

Abstract

The present invention addresses the problem of providing a packaging sheet for foods, which can adequately prevent the invasion of an oil into an outer surface of a food. The packaging sheet for foods according to the present invention is provided with a resin layer laminated on one surface of a base layer, wherein the resin layer is formed by applying a coating solution that is an aqueous emulsion or dispersion mainly composed of a resin containing a carbonyl group. The packaging sheet for foods may be additionally provided with another resin layer (a coating layer formed from a coating solution that is an aqueous emulsion mainly composed of a resin containing a carbonyl group or the like) laminated on the other surface of the base layer. The packaging sheet for foods may be additionally provided with a printed part arranged on the other surface side of the base layer. It is preferred that the base layer is a sheet of oil-resistant paper containing a fluorine-containing additive. It is also preferred that the packaging sheet for foods has a degree of moisture permeability of 200 to 15000 g/m2 24 hr inclusive.

Description

Packaging sheet for food and method for producing food packaging sheet

The present invention relates to a packaging sheet for foods and a method for producing a packaging sheet for food.

In the past, food packaging sheets have been used for packaging various foods, and greaseproof paper has been used as a packaging sheet for foods containing foods such as fried foods. In the food packaging sheet, a resin layer made of polyethylene and a packaging sheet which is printed on the outer surface are laminated on the inner surface of the greaseproof paper (conventional example 1).

In addition, as a food packaging sheet containing a food such as a fried food, the food packaging sheet described in Japanese Laid-Open Patent Publication No. 2010-36951 is proposed. In the food packaging sheet described in the publication, an oil absorbing paper (an example 2) is laminated on the inner surface of the greaseproof paper.

However, in the food packaging sheet of the conventional example 1, when a food containing fried food or the like is packaged, oil permeation occurs on the outer surface. This is considered to be because a small hole is formed in the laminated polyethylene resin layer, and oil is infiltrated from the small hole.

Further, in the food packaging sheet of the above-described conventional example 2, although the oil absorbing paper on the inner surface can absorb a certain amount of oil, the oil exceeding a predetermined amount penetrates into the outer surface, and the result cannot be Effectively prevents oil from penetrating into the outer surface.

Prior art literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2010-36951

In view of the problems described, it is an object of the present invention to provide a reliable prevention of oil outward A packaging sheet for food that penetrates the side surface and a method for producing the packaging sheet for food.

In order to solve the problems, the present invention provides a packaging sheet for food comprising: a base layer; and a resin layer laminated on one surface of the base layer, the resin layer being formed by coating a coating liquid, The coating liquid is an aqueous emulsion containing a carbonyl resin as a main component (water system) Or aqueous dispersion (water system) ).

Since the packaging sheet for foods forms a resin layer laminated on one surface of the base layer by applying the coating liquid, it is difficult to generate small pores on the resin layer, so that it is difficult for oil to permeate from one side of the packaging sheet for food. The other side. Further, since the resin layer is not formed by a coating liquid using a solvent, but is formed by a coating liquid as an aqueous emulsion or an aqueous dispersion, it is easy to arrange the resin layer on a contact surface with a food. In addition, since the coating liquid contains a coating liquid containing a carbonyl resin as a main component, the carbonyl group can be appropriately dispersed in water or the like when the coating liquid is adjusted, and the formed resin layer can exhibit excellent oil repellency. .

The food packaging sheet may further have a structure in which the food packaging sheet further includes an additional resin layer laminated on the other surface of the base layer, the additional resin The layer is formed by coating a coating liquid which is an aqueous emulsion or an aqueous dispersion containing a carbonyl group-containing resin as a main component. By adopting this configuration, the resin layer on both surfaces of the base layer can be easily and reliably adjusted to a desired moisture permeability, and when the food is directly cooked in a microwave oven or the like in a packaged state, it is possible to maintain a suitable mouthfeel. Heat at the same time. In other words, for example, the food packaging sheet of the conventional example 1 has low moisture permeability, and when the food in the packaged state is heated by a microwave oven, water droplets adhere to the inner surface of the food packaging sheet. Attachment to food can damage the taste of the food. On the other hand, if the moisture permeability is too high, when the cooking is performed in a packaged state, moisture may be excessively released from the food, and the taste may be impaired due to the difference in the food. Therefore, by using the packaging sheet for foods which can easily and reliably adjust the moisture permeability, a packaging state suitable for heating cooking of each food can be obtained.

The food packaging sheet may further have a structure in which the food packaging sheet further includes a printing portion, and the printing portion is disposed on the other surface side of the base layer. By adopting this configuration, for example, it is possible to perform different printing for each type of packaged food, and it is possible to recognize the type of food by visually recognizing the outer surface of the food packaging sheet.

The food packaging sheet may further have a structure in which the base layer is a greaseproof paper containing a fluorine-based additive. By adopting this configuration, the oil repellency of the food packaging sheet can be further improved, and oil penetration can be prevented more reliably.

The food packaging sheet may have a structure in which the moisture permeability is 200 g/m ² 24 hr or more and 15000 g/m ² 24 hr or less. By using this configuration, when the food packaged with the food packaging sheet is directly heated in a microwave oven or the like in a packaged state, water vapor generated from the food can be appropriately released to the outside. Therefore, even if it is cooked by heating using a microwave oven or the like, it is difficult to impair the mouthfeel.

The food packaging sheet may have a structure in which the oil blocking property from one side to the other side is 1 hour or longer. By adopting this structure, the penetration of the oil can be more effectively prevented.

Further, the present invention provides a method for producing a packaging sheet for food, comprising: a step of adjusting a coating liquid which is an aqueous emulsion or an aqueous dispersion containing a carbonyl resin as a main component; and forming an oil repellent resin In the step of the layer, the coating liquid is applied to one surface of the base layer having oil repellency, thereby forming the oil-repellent resin layer.

According to this production method, the food packaging sheet which has been described can be produced, and it is possible to have the advantages already described. In other words, the food packaging sheet produced by the production method is less likely to cause pinholes in the resin layer, and it is difficult for the oil to permeate from the side of the food packaging sheet to the other side. Further, since the resin layer is formed by a coating liquid of an aqueous emulsion or an aqueous dispersion, it is easy to arrange the resin layer on a contact surface with a food. Further, since the coating liquid uses a carbonyl group-containing resin as a main component of the resin component, it can be appropriately divided when the coating liquid is adjusted. It is dispersed in water, etc., and the formed resin layer can exert excellent oil repellency.

Further, "moisture permeability" means a value measured by a cup method (JIS Z0208). Further, the "blocking property of oil" is a value obtained by dropping 3 g of salad oil on a resin layer under conditions of 40 ° C and measuring the time required for the oil to penetrate to the back surface.

As described above, the food packaging sheet of the present invention can reliably prevent the oil from penetrating into the outer surface, and the method for producing a food packaging sheet of the present invention can produce the food packaging sheet having the above-described effects. .

1‧‧‧Food packaging sheets

2‧‧‧ grassroots

3‧‧‧ resin layer

4‧‧‧Printing Department

10‧‧‧Food packaging sheets

13‧‧‧ resin layer

Fig. 1 is a schematic cross-sectional view of a packaging sheet for food according to a first embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a packaging sheet for food according to a second embodiment of the present invention.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[First Embodiment]

(Packaging sheet for food)

As shown in Fig. 1, a food packaging sheet 1 according to a first embodiment of the present invention includes: a base layer 2; a resin layer 3 laminated on one surface (inner surface) of the base layer 2; and a printing portion 4, laminated On the other side (outer side) of the base layer 2.

Although the base layer 2 is not particularly limited, it is preferably used as a paper obtained by paper-making a pulp slurry containing pulp fibers as a main component. As such a base layer 2, a pure white roll paper, a cellophane, a wax paper, a kraft paper, a mold paper, a thin paper, general grade paper, Japanese paper, etc. are mentioned. Among them, from the viewpoint of excellent water repellency and oil repellency, it is preferably cellophane or stencil. It is particularly preferred that the base layer is a greaseproof paper containing a fluorine-based additive.

The weight per square meter of the base layer 2 obtained by papermaking as described above is preferably 15 g/m ² or more and 25 g/m ² or less, more preferably 18 g/m ² or more and 23 g/m ² or less, further preferably 20 g/ m ² or more and 22 g/m ² or less. If the weight per square meter of the base layer 2 exceeds the upper limit, since the rigidity of the base layer 2 becomes high, there is a problem that it is not easy to deform along the shape of the food to be packaged, and it is difficult to directly package the food with the packaging sheet 1 for the food. . On the other hand, when the weight per square meter of the base layer 2 is less than the lower limit, there is a problem that the strength is lowered and it is easily broken.

In order to improve oil repellency and water repellency, it is preferred that the base layer 2 contain a fluorine-based additive. The fluorine-based additive may, for example, be a composition containing a compound having a perfluoroalkyl group having a carbon chain length of 6 or less. In a compound having a perfluoroalkyl group having a carbon chain length of 6 or less, the greater the carbon chain length, the better the oil repellency, and therefore it is preferable, and more preferably a perfluoroalkyl group having a carbon chain length of 5 or 6. Compound. Further, when the carbon chain length of the perfluoroalkyl group is 7 or more, there is a problem that the burden on the environment increases, which is not preferable. As the fluorine-based additive, a commercially available product can be used as a commercially available product, and an additive such as "AG-E060" manufactured by Asahi Glass Co., Ltd. can be exemplified.

The content of the fluorine-based additive in the base layer 2 is preferably 0.1 g/m ² or more and 1.0 g/m ² or less, and more preferably 0.3 g/m ² or more and 0.7 g/m ² or less in terms of solid content. If the content of the fluorine-based additive in the base layer 2 exceeds the upper limit, there is a problem that it is difficult to package in the shape of the food because the rigidity of the base layer 2 is increased. On the other hand, when the content of the fluorine-based additive in the base layer 2 is less than the lower limit, there is a problem that sufficient oil repellency cannot be obtained.

As a method of containing a fluorine-based additive in the base layer 2, a method of immersing the base layer 2 in a solution containing a fluorine-based additive, or applying a coating liquid containing a fluorine-based additive to at least one surface of the base layer 2 may be mentioned. Method etc. When a coating liquid containing a fluorine-based additive is applied to the surface of the base layer 2, the coating may be carried out by an applicator attached to a paper machine, or may be applied externally by a coater separate from the paper machine.

The resin layer 3 is formed by applying a coating liquid containing an aqueous emulsion or an aqueous dispersion containing a resin composition containing a carbonyl resin as a main component. The carbonyl group-containing resin may, for example, be a styrene-acrylate copolymer, an epoxy ester resin, a polyurethane resin or an oil-modified phenol resin.

The styrene-acrylate copolymer is not particularly limited and may be utilized. It is known to be produced by emulsion polymerization. Here, in the case of using the emulsion polymerization method, in order to obtain a certain hydrophilicity, it is preferred to use a surfactant. The surfactant may, for example, be an anionic active agent such as a fatty acid soap, an alkylsulfonate, an alkylbenzenesulfonate, an alkylsulfosuccinate or a polyoxyethylene alkyl sulfate. The surfactant is preferably used in an amount of from 1 part by weight to 10 parts by weight per 100 parts by weight of the monomer mixture.

The epoxy ester resin can be obtained by reacting an epoxy resin with a compound having a carboxyl group to produce a ring-opening esterification accompanying an oxirane ring by using various epoxy ester resins, whereby the epoxy ester can be obtained. Resin.

The polyurethane resin is not particularly limited, and a polyurethane resin obtained by polymerizing a polyisocyanate and a polyol can be used. The polyhydric alcohol may, for example, be a polyether polyol, a polyester polyol, a polylactone polyol or a polycarbonate polyol.

The isocyanate is not particularly limited, and for example, an aliphatic diisocyanate compound such as hexamethylene diisocyanate or 2,2,4-trimethylhexamethylene diisocyanate; isophorone diisocyanate or hydrogenated benzene can be used. An alicyclic diisocyanate compound such as dimethylene diisocyanate, 1,4-cyclohexane diisocyanate or 4,4'-dicyclohexylmethane diisocyanate; phenyldimethylene diisocyanate, tetramethyl xylene An aromatic aliphatic diisocyanate compound such as an isocyanate; an aromatic diisocyanate compound such as stilbene diisocyanate or phenylmethane diisocyanate; a modified product of the diisocyanate (containing carbodiimide or uretdione) ), urea imine ( Modified matter, etc.).

The polyether polyol is not particularly limited, and examples thereof include polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, and polyhexamethylene ether glycol.

The polyester polyol is not particularly limited, and for example, polyethylene adipate, polybutylene adipate, polyhexane adipate, polyadipate-3- can be used. Methyl pentylene glycol ester, polyethylene adipate/butylene glycol adipate, polyadipate neopentyl glycol / hexanediol ester, and the like.

The polylactone polyol is not particularly limited, and for example, polycaprol can be used. Ester diol, poly ω-hydroxycaproic acid polyol, and the like.

The polycarbonate polyol is not particularly limited, and for example, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, diethylene glycol, triethylene glycol, tetraethylene glycol, or the like can be used. A product obtained by reacting a diol with a diaryl carbonate such as carbonium chloride or diphenyl carbonate, or a cyclic carbonate such as ethylene carbonate or propylene carbonate. Further, as the polycarbonate polyol, a polyester carbonate obtained by reacting a polyester or a polylactone with carbonium chloride, a diaryl carbonate or a cyclic carbonate can be exemplified.

The oil-modified phenol resin is not particularly limited, and for example, a resin obtained by reacting a phenol, an aldehyde, and an oil under an acidic catalyst can be used.

The oil to be used for the modification is not particularly limited, and for example, vegetable oil can be used, and in particular, one or more oils selected from the group consisting of cashew oil, linseed oil, tung oil, castor oil, and tall oil can be used. Among them, from the viewpoint of storage stability, cashew nut oil is preferred. Further, as the oil-modified phenol resin, a cashew oil-modified novolac type phenol resin is preferred ( Ambiguity type Resin).

In order to ensure the smoothness of the packaged food and the resin layer 3 (the effect of preventing the resin layer 3 from sticking to the food), the resin layer 3 may also contain a filler. The filler contained in the resin layer 3 is not particularly limited and may be inorganic fine particles or organic fine particles. As the filler contained in the resin layer 3, aluminum ruthenate is preferably used, and in addition to the above, cerium oxide, cerium sulfate, titanium oxide or the like may be used. These fillers may be used alone or in combination of two or more.

The average particle diameter of the filler is not particularly limited, but is preferably 50 nm or more and 500 nm or less. The upper limit of the average particle diameter of the filler is more preferably 350 nm, further preferably 300 nm. The lower limit of the average particle diameter of the filler is more preferably 60 nm, further preferably 80 nm. In the case where the average particle diameter of the filler exceeds the upper limit, there is a problem that the smoothness of the food and the resin layer 3 is less likely to be improved. On the other hand, in the case where the average particle diameter of the filler is less than the lower limit, there is agglomeration of the filler in the coating liquid, resulting in failure to sufficiently exert the smoothness of the food and resin layer 3. problem.

The content of the filler in the resin layer 3 is not particularly limited, and is preferably 1 part by weight or more and 20 parts by weight or less based on 100 parts by weight of the resin of the main component of the resin layer 3. The upper limit of the content of the filler is more preferably 15 parts by weight, still more preferably 10 parts by weight. Further, the lower limit of the content of the filler is more preferably 3 parts by weight, still more preferably 5 parts by weight. In the case where the content of the filler exceeds the upper limit, there is a problem that the smoothness of the food and resin layer 3 is less likely to be improved. On the other hand, when the content of the filler is less than the lower limit, there is a problem that the density of the filler is lowered and the smoothness of the food and the resin layer 3 cannot be sufficiently exhibited.

The printing portion 4 is not particularly limited, and a printing portion obtained by fixing a pigment to the base layer 2 by an adhesive can be used. The pigment is not particularly limited, and a black pigment, a white pigment, a red pigment, a cyan pigment, a yellow pigment, a green pigment, an orange pigment, a violet pigment, or the like can be used. Further, the binder is not particularly limited, and an acrylic resin, a styrene resin, a polyester resin, a urethane resin, a polyethylene resin, an alkyd resin, a petroleum resin, a ketone resin, or an epoxy resin can be used. One or a mixture of two or more kinds of various synthetic resins such as a resin, a melamine resin, a fluorine resin, a fluorene resin, a cellulose derivative, and a rubber resin, and a copolymer.

The moisture permeability of the food packaging sheet 1 is not particularly limited, but is preferably 200 g/m ² 24 hr or more and 15,000 g/m ² 24 hr or less. The upper limit of the moisture permeability of the food packaging sheet 1 is more preferably 13,000 g/m ² , still more preferably 11,000 g/m ² . Further, the lower limit of the moisture permeability of the food packaging sheet 1 is more preferably 1000 g/m ² , still more preferably 4000 g/m ² , and particularly preferably 7000 g/m ² . When the moisture permeability is less than the lower limit, when the food in the packaged state is directly heated by the microwave oven, water droplets may adhere to the inner surface of the food packaging sheet, and the water droplets adhere to the food and thereby damage The taste of the food is a problem. On the other hand, if the moisture permeability exceeds the upper limit, when the cooking is directly heated in the packaged state, excessive moisture is released from the food, and there is a problem that the texture is impaired due to the difference in the food.

The shielding property of the oil from one side to the other side of the packaging sheet 1 for food is not particularly limited, but is preferably 1 hour or longer, more preferably 1.5 hours or longer, and still more preferably 2 hours or longer. In the case where the occlusion property of the oil is less than the lower limit, there is a problem that the penetration of oil cannot be reliably prevented.

(Production method)

Next, a method of manufacturing the food packaging sheet 1 according to the first embodiment will be described. The method for producing the food packaging sheet 1 generally includes: (a) a step of preparing the base layer 2; (b) an adjustment step of preparing a material for forming the resin layer 3; and (c) a laminating step of laminating the resin layer 3 on the base layer 2. On the inner side surface; and (d) the printing process, the printing unit 4 is formed.

Specifically, in the adjustment step (b), a coating liquid containing an aqueous emulsion or an aqueous dispersion containing a resin composition containing a carbonyl resin as a main component is prepared. The coating liquid is prepared by mixing the carbonyl group-containing resin and an aqueous solvent. The aqueous solvent is not particularly limited, and examples thereof include a water monomer; a mixture of an alcohol such as ethanol or propanol, and water. Further, the coating liquid may contain a filler or the like as needed.

In the laminating step (c), the coating liquid prepared by the adjusting step (b) is applied onto one surface of the base layer 2, and further dried and solidified to laminate the resin layer 3. The method of applying the coating liquid on the inner surface of the base layer 2 is not particularly limited, and examples thereof include a gravure coating method, a bar coating method, and a blade coating method ( Method), roll coating method, blade coating method A conventional method such as a method). In addition, the coating amount of the coating liquid is preferably 0.1 g/m ² or more and 8 g/m ² or less in terms of solid content. The lower limit of the coating amount is more preferably 0.5 g/m ² in terms of solid content. The lower limit of the coating amount is more preferably 5 g/m ² in terms of solid content, and particularly preferably 2 g/m ² .

The printing step (d) is a step of performing printing on the other surface of the base layer 2, and the printing method may be carried out by various conventional methods. In addition, the printing process (d) This may be carried out after the lamination step (c) or before the lamination step (c). Further, the printing step (d) may not be performed by preparing the already printed base layer in the step (a) of preparing the base layer.

(advantage)

The food packaging sheet 1 can be suitably used for directly packaging foods containing fried foods (for example, hamburgers and rice balls containing fried foods, etc.). At the time of the packaging, the resin layer 3 can be used as the inner side surface (food side surface), and the resin layer 3 can reliably prevent the oil from the food from penetrating into the outer side of the food packaging sheet 1. Face. In other words, since the resin layer 3 is formed by application of a coating liquid, it is difficult to generate small pores, and therefore it is difficult for the oil to permeate from the inner surface of the food packaging sheet 1 to the outer surface. Further, since the coating liquid uses a carbonyl group-containing resin as a main component of the resin component, the carbonyl group can exhibit appropriate oil repellency. Further, since the base layer 2 of the food packaging sheet 1 is a grease-proof paper containing a fluorine-based additive, the oil repellency of the food packaging sheet 1 can be further improved, and oil penetration can be more reliably prevented.

Further, the resin layer 3 is formed not only by a coating liquid using a solvent but also by a coating liquid of an aqueous emulsion or an aqueous dispersion, so that the resin layer 3 can be disposed on the inner side surface without particularly performing other treatments ( Food side). Further, since the coating liquid uses a carbonyl group-containing resin as a main component of the resin component, the carbonyl group can be appropriately dispersed in water or the like in the preparation of the coating liquid.

Further, since the food packaging sheet 1 has the printing portion 4 on the outer surface of the base layer 2, for example, each of the types of foods to be packaged is printed differently, thereby visually identifying the food only. The type of the food can be identified by the outer surface of the packaging sheet 1.

[Second Embodiment]

A food packaging sheet according to a second embodiment of the present invention will be described below with reference to Fig. 2, and in the description of the food packaging sheet according to the second embodiment, the same structure or function as the portion of the first embodiment will be described. Use the same attachment Diagram mark, sometimes omitted from the description.

The food packaging sheet 10 of the second embodiment includes a base layer 2, a resin layer 3 laminated on one surface (inside surface) of the base layer 2, and a printing portion 4 laminated on the same as the first embodiment. The other surface (outer surface) side of the resin layer 13. Further, the food packaging sheet 10 of the second embodiment has another resin layer 13 (hereinafter sometimes referred to as a second resin layer) laminated on the other surface (outer surface) of the base material layer 2. The second resin layer 13 is disposed between the base material layer 2 and the printing portion 4, in other words, the printing portion 4 is laminated on the other surface of the second resin layer 13.

Since the second resin layer 13 can have the same structure as the resin layer 3 formed on one surface of the base layer 2, detailed description thereof will be omitted.

The food packaging sheet 10 of the second embodiment can be produced by substantially the same method as the method for producing the food packaging sheet 1 of the first embodiment. In other words, the food packaging sheet 10 of the second embodiment includes: (a) a step of preparing the base layer 2; (b) an adjustment step of preparing a material for forming the resin layer 3; and (c) a laminating step of the inside of the base layer 2; The resin layers 3 and 13 are laminated on the surface and the outer surface, respectively; (d) The printing step is performed to form the printing portion 4. Further, the resin layers 3 and 13 on the inner side surface and the outer side surface may be simultaneously formed by the same steps, or may be separately formed by another step.

Since the food packaging sheet 10 of the second embodiment has the resin layers 3 and 13 on both surfaces of the base layer 2, the moisture permeability and the oil repellency can be easily controlled.

[Other embodiments]

The above-described embodiment is constituted by the above-described structure, and has the above-described advantages, but the present invention is not limited thereto, and the design can be appropriately changed within the scope of the present invention.

That is, in the above-described embodiment, an embodiment having a printing portion has been described. However, in the present invention, the printing portion is not an essential component. Further, even in the case where the printing portion is provided, the printing portions of the first embodiment and the second embodiment are not limited. In other words, for example, a packaging sheet for food in which a printing portion is provided on the outer surface of the base material layer and a resin layer is laminated on the outer surface of the printing portion is also in the present invention. Within the scope of the claim. Further, a packaging sheet for foods using a nonwoven fabric or a woven fabric as a base layer is also within the scope of the present invention.

Further, in the above-described embodiment, the food containing the fried food has been described for the object to be packaged, but the present invention is not limited thereto. Further, as the food containing the fried food, the fried food itself such as a dry fried food may be used.

[Examples]

Next, four embodiments of the food packaging sheet will be described, but the present invention is not limited by the embodiment.

(Example 1)

As the base layer, a greaseproof paper having a weight per square meter of 25 g/m ² (trade name "EC oil resistant paper": manufactured by Tenno Special Paper Co., Ltd.) was used. Coating agent (trade name " B-7": Manufactured by the First Coatings Co., Ltd.) was diluted with water to prepare a coating liquid, and the coating liquid was applied to one surface of the grease-proof paper. The coating amount of the coating liquid was 1 g in terms of solid content. /m ^{2 The} coating liquid was dried and solidified to obtain a packaging sheet for food of Example 1.

(Example 2)

In the same manner, the coating liquid was applied to the other surface of the food packaging sheet of Example 1, and the coating liquid was dried and solidified to obtain the food packaging sheet of Example 2.

(Example 3)

As the base layer, a greaseproof paper (trade name "EC oil resistant paper": manufactured by Tenno Special Paper Co., Ltd.) having a weight of 25 g/m ² per square meter was used. Coating agent (trade name " B-7": Manufactured by the First Coatings Co., Ltd.) was diluted with water to prepare a coating liquid, and the coating liquid was applied to both surfaces of the greaseproof paper. The coating amount of the coating liquid (total of both surfaces) The coating liquid was dried and solidified in a solid content of 4 g/m ² , and the food packaging sheet of Example 3 was obtained.

(Example 4)

The food packaging sheet of Example 4 was obtained in the same manner as in Example 3 except that the coating amount (total of both surfaces) was 7 g/m ² in terms of solid content.

(Comparative example)

As Comparative Example 1, the same greaseproof paper as in Example 1 and Example 2 was used. In addition, as a comparative example 2, the polyethylene film of the average thickness of 8 micrometers was laminated on the thin paper ("HS21 paper" of Oji Paper Co., Ltd.), and the packaging sheet for commercial use of the comparative example 2 was obtained.

(oil blocking test)

The oil shielding test was performed on Example 1, Example 2, and Comparative Example. The oil occlusion test was carried out by dropping 3 g of salad oil on the resin layer at 40 ° C, and measuring the time required for the oil to penetrate to the back surface. Further, in Example 1, the salad oil was dropped on the surface on which the resin layer was formed.

In Example 1 and Example 2, even after 2 hours passed, the oil did not penetrate to the back side. On the other hand, in Comparative Example 1, when the lapse of about 15 minutes, oil permeation to the back surface occurred. From this, it was found that the oils of Example 1 and Example 2 had higher blocking properties than Comparative Example 1.

Further, 4 g of salad oil was dropped on the resin layer under the conditions of 40 ° C for Example 3 and Example 4, and the time required for the oil to penetrate to the back surface was measured. In Example 3 and Example 4, even after 2 hours passed, the oil did not penetrate to the back side. That is, it was found that the oils of Example 3 and Example 4 were also more viscous than Comparative Example 1.

(moisture permeability)

Next, the moisture permeability test was performed on Examples 1 to 4 and Comparative Examples 1 and 2. The moisture permeability test was carried out in accordance with the cup method (JIS Z0208).

In Example 1, the moisture permeability was 10,600 g/m ² 24 hr. In Example 2, the moisture permeability was 8500 g/m ² 24 hr. In Example 3, the moisture permeability was 4,300 g/m ²² 4 hr. In Example 4, the moisture permeability was 350 g/m ² 24 hr. In Comparative Example 1, the moisture permeability was 13600 g/m ² 24 hr. In Comparative Example 2, the moisture permeability was 96 g/m ² 24 hr. In Examples 1 to 4, although the oil has high barrier properties as described above, moisture permeability is also achieved within a suitable range.

When foods containing fried foods and the like were packaged in the food packaging sheets of Examples 1 to 4 and Comparative Examples 1 and 2, in the case of the food packaging sheets of Examples 1 to 4, no oil was produced. The phenomenon of penetration into the outer surface, and when heated by a microwave oven, no water droplets adhered to the inner surface of the food packaging sheet. On the other hand, in the case of the packaging sheet for foods of the comparative example 1, the phenomenon which the oil penetrates the surface of the outer side arises. Further, in the case of the food packaging sheet of Comparative Example 2, water droplets adhered to the inner surface of the food packaging sheet when heated in a microwave oven.

Industrial applicability

As described above, the food packaging sheet of the present invention has excellent oil repellency, and thus can be suitably used for packaging foods containing fried foods.

1‧‧‧Food packaging sheets

2‧‧‧ grassroots

3‧‧‧ resin layer

4‧‧‧Printing Department

Claims (7)

A packaging sheet for food, characterized in that the packaging sheet for food comprises: a base layer; and a resin layer laminated on one side of the base layer, the resin layer being formed by coating a coating liquid, The coating liquid is an aqueous emulsion or an aqueous dispersion containing a carbonyl resin as a main component. The packaging sheet for food according to claim 1, wherein the packaging sheet for food further comprises an additional resin layer laminated on the other side of the base layer, the additional The resin layer is formed by coating a coating liquid which is an aqueous emulsion or an aqueous dispersion containing a carbonyl group-containing resin as a main component. The food packaging sheet according to claim 1, wherein the food packaging sheet further includes a printing portion, and the printing portion is disposed on the other surface side of the base layer. The food packaging sheet according to claim 1, wherein the base layer is a greaseproof paper containing a fluorine-based additive. The food packaging sheet according to claim 1, wherein the moisture permeability is 200 g/m ² 24 hr or more and 15000 g/m ² 24 hr or less. The food packaging sheet according to claim 1, wherein the oil blocking property from one side to the other side is 1 hour or longer. A method for producing a packaging sheet for food, characterized in that The method for producing a food packaging sheet includes a step of adjusting a coating liquid which is an aqueous emulsion or an aqueous dispersion containing a carbonyl group-containing resin as a main component, and a step of forming a resin layer, and the coating liquid It is coated on one side of the base layer, thereby forming a resin layer.