TWI482728B - Food packaging sheet and food packaging sheet manufacturing method - Google Patents

Description

Packaging sheet for food and method for producing food packaging sheet

The present invention relates to a method for producing a packaging sheet for foods and 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 JP-A-2010-36951 is proposed. In the food packaging sheet described in the publication, an oil absorbing paper is laminated on the inner surface of the greaseproof paper (Conventional Example 2).

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

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 is not effective. The phenomenon of preventing oil from penetrating into the outer surface.

Prior technical literature

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

In view of the foregoing problems, it is an object of the present invention to provide a reliable prevention of oil to the outside A surface-penetrating packaging sheet for food and a method for producing the packaging sheet for food.

In order to solve the above problems, the present invention provides a food packaging sheet comprising: a base layer; and a resin layer laminated on one surface of the base layer, wherein the resin layer is formed by applying a coating liquid, An aqueous emulsion or an aqueous dispersion containing a carbonyl resin as a main component.

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 in the resin layer, so that it is difficult for the oil to permeate from one side of the food packaging sheet to another. One 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 containing a carbonyl group-containing resin as a main component is used, 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 another resin layer laminated on the other surface of the base layer, and the other resin layer is coated. It is formed by 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, it is possible to easily and reliably adjust the desired moisture permeability by using the resin layer on both surfaces of the base layer, and to maintain a proper taste when the food is directly cooked in a microwave oven or the like in a packaged state. While heating. 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 above-described packaging sheet for foods which can easily and reliably adjust the moisture permeability, it is possible to obtain a packaging state suitable for heating cooking of each food.

In the food packaging sheet, the food packaging sheet may further include a printing portion 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 the food by visually recognizing the outer surface of the food packaging sheet.

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

Furthermore, the present invention provides a method for producing a packaging sheet for food, comprising: adjusting a coating liquid as an aqueous emulsion or an aqueous dispersion containing a carbonyl group-containing resin as a main component; and coating the coating liquid on the coating liquid The step of forming a resin layer on one side of the base layer.

According to this production method, the above-described packaging sheet for foods 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 the contact surface with the food. Further, since the coating liquid contains a carbonyl group-containing resin as a main component of the resin component, it can be suitably dispersed in water or the like when the coating liquid is adjusted, and the formed resin layer can exhibit excellent oil repellency.

Further, "moisture permeability" means a value measured by a cup method (JIS Z0208). this In addition, "oil shielding property" is a value obtained by dropping 3 g of salad oil on a resin layer at 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‧‧‧Second 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 (inside surface) of the base layer 2, and a printing portion 4 laminated on the base layer. The other side of 2 (the outer side).

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. Particularly preferably, 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, and extremely preferably 20 g/m ^{2 .} Above 22g/m ² or less. When the weight per square meter of the base layer 2 exceeds the above 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 food. On the other hand, when the weight per square meter of the base layer 2 is less than the aforementioned 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 contains 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 the compound having a perfluoroalkyl group having a carbon chain length of 6 or less, the larger the carbon chain length, the better the oil repellency, and therefore it is preferable, and more preferably a compound having a perfluoroalkyl group having a carbon chain length of 5 or 6. . 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, and as an item for sale on the market, 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 above 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 above 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 can be produced by a conventional emulsion polymerization method. Here, in the case of using the emulsion polymerization method, in order to obtain a certain hydrophilicity, a surfactant is preferably used. As the aforementioned surfactant, a fatty acid soap, an alkyl sulfonate, an alkylbenzene sulfonate, an alkyl sulfo amber can be exemplified. An anionic active agent such as an acid salt 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 using various epoxy ester resins, and by reacting an epoxy resin with a compound having a carboxyl group to produce a ring-opening esterification accompanying an oxirane ring, whereby the epoxy ester resin can be obtained.

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 may be used. An alicyclic diisocyanate compound such as methylene diisocyanate, 1,4-cyclohexane diisocyanate or 4,4'-dicyclohexylmethane diisocyanate; benzene dimethylene diisocyanate, tetramethyl xylene diisocyanate An aromatic aliphatic diisocyanate compound; an aromatic diisocyanate compound such as stilbene diisocyanate or phenylmethane diisocyanate; a modified product of the above diisocyanate (containing carbodiimide, urethodione, urea imine) (urethoimine), 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-methyl can be used. Pentyl glycol ester, polyethylene adipate/butylene glycol adipate, polyhexane adipate neopentyl glycol/hexanediol ester, and the like.

The polylactone polyol is not particularly limited, and for example, polycaprolactone diol, polyω-hydroxycaproic acid polyol, or the like can be used.

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 can be used. A product obtained by reacting a diol with a diaryl carbonate such as carbon chlorochloride 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 phenolic resin is preferred.

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 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 above filler is more preferably 350 nm, and most preferably 300 nm. The lower limit of the average particle diameter of the above filler is more preferably 60 nm, and most preferably 80 nm. In the case where the average particle diameter of the filler exceeds the above 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, when the average particle diameter of the filler is less than the above lower limit, there is a problem that the filler aggregates in the coating liquid, and the smoothness of the food and the resin layer 3 cannot be sufficiently exhibited.

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 aforementioned filler is more preferably 15 parts by weight, and most preferably 10 parts by weight. Further, the lower limit of the content of the aforementioned filler is more preferably 3 parts by weight, and is preferably 5 parts by weight. Parts by weight. In the case where the content of the filler exceeds the above 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 unit 4 is not particularly limited, and a printing unit 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 , and most 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 , very preferably 4,000 g/m ² , and particularly preferably 7,000 g/m ² . When the moisture permeability is less than the lower limit, when the food in the packaged state is directly heated by a microwave oven, water droplets may adhere to the inner surface of the food packaging sheet, and the water droplets adhere to the food to impair the food. The taste of the problem. On the other hand, when the moisture permeability exceeds the above 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 the one side to the other side of the food packaging sheet 1 is not particularly limited, but is preferably 1 hour or longer, more preferably 1.5 hours or longer, and is preferably 2 hours or longer. When the occlusion property of the oil is less than the aforementioned 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 of the first embodiment will be described. The manufacturing method of 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; (c) a laminating step of laminating the resin layer 3 on the base layer 2 On the inner side surface; and (d) the printing step, the printing portion 4 is formed.

Specifically, in the above-mentioned adjustment step (b), a coating liquid containing an aqueous emulsion or an aqueous dispersion of a resin composition containing a carbonyl group-containing resin as a main component is prepared. The aforementioned coating liquid is prepared by mixing the aforementioned 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 lamination step (c), the coating liquid prepared by the above-mentioned adjustment step (b) is applied onto one surface of the base layer 2, and further dried and solidified, whereby the resin layer 3 is laminated. 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, a knife coating method, a roll coating method, and a knife coating method ( A conventional method such as a blade coat method or a die coating 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, in terms of solid content, more preferably 5g / m ^2, particularly preferably 2g / m ^2.

The printing step (d) is a step of performing printing on the other side of the base layer 2, and the printing method may be carried out by various conventional methods. Further, the printing step (d) may be performed after the laminating step (c), or may be performed before the laminating step (c). Further, the printing step (d) may not be performed by preparing the base layer which has been printed in the step (a) of preparing the above-mentioned base layer.

(advantage)

The aforementioned 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.). During the aforementioned packaging, The resin layer 3 can be used as a food on the inner side (food side surface), and the resin layer 3 can reliably prevent the oil from the food from penetrating into the outer surface of the food packaging sheet 1. 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 contains 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.

In addition, 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 (food) without otherwise performing other treatments. 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 unit 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 recognizing only the food. 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 of the second embodiment, the same configuration or function as the portion of the first embodiment will be described. The same reference numerals are used for the parts, and the description thereof is sometimes omitted.

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 resin layer. The other side of the 13 (outer side) side. 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. before 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 described above can be produced by substantially the same method as the method for producing the food packaging sheet 1 of the first embodiment. That is, 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; (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) a 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 configuration 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, the embodiment having the 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 foods 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 within the scope of the present invention. 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 aforementioned packaging sheet for foods will be described, but the present invention is not limited by the foregoing embodiments.

(Example 1)

The base layer used a greaseproof paper having a weight per square meter of 25 g/m ² (trade name "EC oil resistant paper": manufactured by Tianzhu Special Paper Co., Ltd.). A coating agent (trade name "Harvill B-7": manufactured by First Paint Co., Ltd.) was diluted with water to prepare a coating liquid, and the coating liquid was applied onto one surface of the greaseproof paper. The coating amount of the coating liquid was 1 g/m ² in terms of solid content. The coating liquid was dried and solidified to obtain a packaging sheet for foods 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)

The base layer used a greaseproof paper (trade name "EC oil resistant paper": manufactured by Tianhe Special Paper Co., Ltd.) having a weight of 25 g/m ² per square meter. A coating agent (trade name "Harvill B-7": manufactured by First Paint 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) was 4 g/m ² in terms of solid content. The coating liquid was dried and solidified to obtain a packaging sheet for food of Example 3.

(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. Further, as a comparative example 2, a polyethylene film having an average thickness of 8 μm was laminated on a thin paper ("HS21 paper" of Oji Paper Co., Ltd.), and a packaging sheet for a product of Comparative Example 2 was obtained.

(oil blocking test)

The oil shielding test was performed on Example 1, Example 2, and Comparative Example. The above 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 at 40 ° C for Example 3 and Example 4, and the time required for the oil to penetrate to the back side 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 to 2. The moisture permeability test described above 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 the first to fourth embodiments, although the oil has high occlusion property as described above, the moisture permeability is achieved within a suitable range.

When foods containing fried foods and the like are packaged in the food packaging sheets of Examples 1 to 4 and Comparative Examples 1 to 2, the food packaging sheets of Examples 1 to 4 are used. In this case, the phenomenon that the oil penetrates to the outer surface is not generated, and when the cooking is performed by heating in a microwave oven, no water droplets adhere 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. In addition, the food of Comparative Example 2 In the case of using a packaging sheet, water droplets adhere to the inner surface of the food packaging sheet when it is cooked by heating 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 (5)

A food packaging sheet comprising: a base layer; and a resin layer laminated on one surface of the base layer; the base layer is a greaseproof paper containing a fluorine-based additive; and the resin layer is formed by applying a coating liquid, the coating The liquid system is an aqueous emulsion or an aqueous dispersion containing a carbonyl group-containing resin as a main component; and the coating amount of the coating layer of the resin layer is 0.1 g/m ² or more and 8 g/m ² or less, and the moisture permeability of the packaging sheet for foods It 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, further comprising another resin layer laminated on the other surface of the base layer; the other resin layer being formed by applying a coating liquid, This coating liquid is used as an aqueous emulsion or aqueous dispersion containing a carbonyl group-containing resin as a main component. The food packaging sheet according to claim 1, further comprising a printing portion disposed on the other surface side of the base layer. 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 foods comprising the steps of: adjusting a coating liquid as an aqueous emulsion or an aqueous dispersion containing a carbonyl group-containing resin as a main component; and coating the coating liquid on a fluorine-containing additive greaseproof paper on one side of the base layer, a step to form a resin layer; coating amount of the resin layer was 0.lg / m ² more than 8g / m ² or less, the moisture-permeable food packaging sheet is 200g / m ² 24hr The above 15000 g/m ^{2 is} 24 hr or less.