WO2014007054A1 - Packaging sheet for foods, and method for producing packaging sheet for foods - Google Patents

Packaging sheet for foods, and method for producing packaging sheet for foods Download PDF

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Publication number
WO2014007054A1
WO2014007054A1 PCT/JP2013/066627 JP2013066627W WO2014007054A1 WO 2014007054 A1 WO2014007054 A1 WO 2014007054A1 JP 2013066627 W JP2013066627 W JP 2013066627W WO 2014007054 A1 WO2014007054 A1 WO 2014007054A1
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Prior art keywords
packaging sheet
oil
food packaging
resin
base layer
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PCT/JP2013/066627
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French (fr)
Japanese (ja)
Inventor
赤松　正
晃一 澤田
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恵和株式会社
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Publication of WO2014007054A1 publication Critical patent/WO2014007054A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials

Definitions

  • the present invention relates to a food packaging sheet and a method for producing a food packaging sheet.
  • the food packaging sheet described in this publication is obtained by laminating an oil-absorbing paper on the inner surface of an oil-resistant paper (conventional example 2).
  • the oil-absorbing paper on the inner surface absorbs a certain amount of oil, a predetermined amount or more of oil permeates the outer surface, and eventually the oil on the outer surface It is not possible to effectively prevent the phenomenon of penetration.
  • the present invention has been made in view of such circumstances, and it is an object of the present invention to provide a food packaging sheet capable of accurately preventing the permeation of oil to the outer surface and a method for producing the food packaging sheet.
  • the packaging sheet for food according to the present invention made to solve the above problems is
  • the base layer A resin layer laminated on one surface of the base layer,
  • the resin layer is formed by application of a coating liquid that is an aqueous emulsion or aqueous dispersion mainly containing a carbonyl group-containing resin.
  • the resin layer laminated on one surface of the base layer is formed by application of the coating liquid, pinholes are hardly formed in the resin layer. Oil hardly penetrates from one to the other.
  • this resin layer is formed not by a coating solution using a solvent but by a coating solution that is an aqueous emulsion or aqueous dispersion, it is easy to dispose the resin layer on the contact surface with food.
  • this coating solution uses a carbonyl group-containing resin as a main component, the carbonyl group can be appropriately dispersed in water when the coating solution is prepared and formed.
  • the formed resin layer can exhibit suitable oil resistance.
  • the food packaging sheet further includes another resin layer laminated on the other side of the base layer, and the other resin layer is a water-based emulsion or water-based dispersion mainly containing a carbonyl group-containing resin. It is possible to adopt a configuration formed by coating with a working liquid. By adopting this configuration, the resin layer on both sides of the base layer can be easily and surely adjusted to a preferred moisture permeability, and a suitable texture is obtained when the food is cooked in a microwave oven or the like in a packaged state. It can be heated while maintaining.
  • the packaging sheet of Conventional Example 1 when the food is heated by a microwave oven in a packaging state, water droplets adhere to the inner surface of the food packaging sheet, and the water droplets It adheres to food and impairs the food texture.
  • the moisture permeability is too high, moisture is excessively released from the food when cooked in the packaged state, and depending on the food, the texture may be impaired.
  • the packaging state suitable for heat cooking can be obtained for every food by using the said food packaging sheet which can adjust moisture permeability easily and reliably as mentioned above.
  • the food packaging sheet may employ a configuration further including a printing unit disposed on the other surface side of the base layer.
  • a printing unit disposed on the other surface side of the base layer.
  • the food packaging sheet can employ a configuration in which the base layer is oil-resistant paper containing a fluorine-based additive. By adopting this configuration, the oil resistance of the food packaging sheet can be further improved, and oil penetration can be prevented more accurately.
  • the said food packaging sheet can employ
  • the food packaging sheet can employ a configuration in which the oil shielding property from one to the other is 1 hour or more. By adopting this configuration, the penetration of the oil can be more effectively prevented.
  • the method for producing a food packaging sheet according to the present invention comprises: A step of preparing a coating liquid which is a water-based emulsion or a water-based dispersion mainly composed of a carbonyl group-containing resin, and by applying this coating liquid to one surface of a base layer having oil resistance, an oil-resistant resin layer Forming a step.
  • the food packaging sheet described above can be manufactured, and the advantages described above can be achieved. That is, the food packaging sheet produced by the production method is unlikely to have pinholes in the resin layer, and the oil hardly penetrates from one side of the food packaging sheet to the other. Moreover, since this resin layer is formed with the coating liquid of a water-based emulsion or a water-based dispersion, it is easy to arrange
  • moisture permeability refers to a value measured according to the cup method (JISZ0208).
  • the “oil shielding property” is a value obtained by dropping 3 g of salad oil onto the resin layer under the condition of 40 ° C. and measuring the time required for back-through.
  • the food packaging sheet according to the present invention can accurately prevent the permeation of oil to the outer surface, and the method for producing a food packaging sheet according to the present invention has the above effects.
  • Packaging sheets can be produced.
  • FIG. 1 is a schematic cross-sectional view of a food packaging sheet according to a first embodiment of the present invention. It is a typical sectional view of the packaging sheet for foods concerning a second embodiment of the present invention.
  • the food packaging sheet 1 of the 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 the other of the base layer 2. And a printing unit 4 formed on the surface (outer surface).
  • the base layer 2 is not particularly limited, but paper made of pulp slurry containing pulp fibers as the main component is preferably used.
  • Examples of such a base layer 2 include pure white roll paper, glassine paper, paraffin paper, craft paper, imitation paper, thin paper, general fine paper, and Japanese paper.
  • glassine paper and paraffin paper are preferable in terms of excellent water resistance and oil resistance.
  • the base layer is preferably oil-resistant paper containing a fluorine-based additive.
  • the basis weight 15 g / m 2 or more 25 g / m 2 or less is preferable, 18 g / m, more preferably 2 or more 23 g / m 2 or less, 20 g / m 2 or more 22 g / m 2 or less is more preferable. If the basis weight of the base layer 2 exceeds the above upper limit, the rigidity of the base layer 2 increases, so that it is difficult to deform along the shape of the food to be packaged, and it is difficult to directly package the food with the food packaging sheet 1. There is a risk. On the other hand, when the basis weight of the base layer 2 is less than the above lower limit, the strength is likely to be lowered and easily broken.
  • the base layer 2 preferably contains a fluorine-based additive in order to improve oil resistance and water resistance.
  • the fluorine-based additive include a composition containing a compound having a perfluoroalkyl group having a carbon chain length of 6 or less.
  • the compounds having a perfluoroalkyl group having a carbon chain length of 6 or less those having a larger carbon chain length are preferable in terms of excellent oil resistance, and compounds having a perfluoroalkyl group having a carbon chain length of 5 or 6 are more preferable.
  • the carbon chain length of the perfluoroalkyl group is 7 or more, there is a possibility that the load on the environment may increase, such being undesirable.
  • Commercially available products may be used as the fluorine-based additive. Examples of commercially available products include “AG-E060” manufactured by Asahi Glass Co., Ltd.
  • 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, 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, the base layer 2 may have a high rigidity, which may make it difficult to package along the shape of the food. On the other hand, when the content of the fluorine-based additive in the base layer 2 is less than the lower limit, sufficient oil resistance may not be obtained.
  • Examples of the method for containing the fluorine-based additive in the base layer 2 include impregnating the base layer 2 with a solution containing the fluorine-based additive, or applying a coating solution containing the fluorine-based additive on at least one surface of the base layer 2. And the like.
  • a coating solution containing a fluorine-based additive on the surface of the base layer 2 it may be applied on-machine with a coating machine attached to the paper machine, or off with a coating machine separated from the paper machine. Machine coating may be performed.
  • the resin layer 3 is formed by application of an aqueous emulsion or aqueous dispersion coating liquid containing a resin composition containing a carbonyl group-containing resin as a main component.
  • a resin composition containing a carbonyl group-containing resin examples include styrene / acrylic acid ester copolymers, epoxy ester resins, urethane resins, and oil-modified phenol resins.
  • the styrene / acrylic acid ester copolymer is not particularly limited, but can be produced by a known emulsion polymerization method.
  • a surfactant in order to obtain a certain hydrophilicity.
  • the surfactant include anionic surfactants such as fatty acid soaps, alkyl sulfonates, alkyl benzene sulfonates, alkyl sulfosuccinates, and polyoxyethylene alkyl sulfates. This surfactant is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the monomer mixture.
  • epoxy ester resins can be employed, and can be obtained by causing esterification with ring opening of the oxirane ring by reaction of the epoxy resin and a compound containing a carboxyl group.
  • the urethane resin is not particularly limited.
  • a polymer obtained by polymerizing polyisocyanate and polyol can be used.
  • the polyol include polyether polyol, polyester polyol, polylactone polyol, and polycarbonate polyol.
  • the isocyanate is not particularly limited, but examples thereof include aliphatic diisocyanate compounds such as hexamethylene diisocyanate and 2,2,4-trimethylhexamethylene diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, and 1,4-cyclohexane diisocyanate.
  • Alicyclic diisocyanate compounds such as 4,4'-dicyclohexylmethane diisocyanate, araliphatic diisocyanate compounds such as xylylene diisocyanate and tetramethylxylene diisocyanate, aromatic diisocyanate compounds such as toluylene diisocyanate and phenylmethane diisocyanate, Modified products (carbodiimide, uretdione, uretoimine-containing modified products, etc.) can be employed.
  • the polyether polyol is not particularly limited, and for example, polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, polyhexamethylene ether glycol and the like can be employed.
  • the polyester polyol is not particularly limited.
  • polyethylene adipate, polybutylene adipate, polyneopentyl adipate, poly-3-methylpentyl adipate, polyethylene / butylene adipate, polyneopentyl / hexyl adipate, etc. can be used. It is.
  • the polylactone polyol is not particularly limited, and for example, polycaprolactone diol, polyomegahydroxycaproic acid polyol, and the like can be used.
  • the polycarbonate polyol is not particularly limited.
  • a product obtained by reacting a diol such as glycol with phosgene and a diaryl carbonate such as diphenyl carbonate or a cyclic carbonate such as ethylene carbonate or propylene carbonate can be employed.
  • the polyester carbonate obtained by reaction of polyester or polylactone, phosgene, and a diaryl carbonate or a cyclic carbonate is mentioned.
  • the oil-modified phenol resin is not particularly limited, and for example, a resin obtained by reacting phenols, aldehydes and oil under an acidic catalyst can be used.
  • the oil used for modification is not particularly limited, and for example, one or more selected from vegetable oils, particularly cashew oil, linseed oil, paulownia oil, castor oil and tall oil can be employed. Among these, cashew oil is preferable from the viewpoint of storage stability.
  • the oil-modified phenol resin it is preferable to employ a cashew oil-modified novolac type phenol resin.
  • the resin layer 3 may contain a filler in order to ensure smoothness between the food to be packaged and the resin layer 3 (an effect of preventing the resin layer 3 from being caught on the food).
  • the filler contained in the resin layer 3 is not particularly limited, and examples thereof include inorganic fine particles and organic fine particles.
  • aluminum silicate is preferably used, and silica, barium sulfate, titanium oxide, or the like can also be used. Only 1 type may be used for the said filler and it may mix and use 2 or more types.
  • the average particle size 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 size of the filler is more preferably 350 nm, and even more preferably 300 nm.
  • the lower limit of the average particle size of the filler is more preferably 60 nm, and still more preferably 80 nm.
  • the average particle diameter of the filler exceeds the upper limit, the smoothness between the food and the resin layer 3 may not be improved much.
  • the average particle diameter of the filler is less than the lower limit, the filler aggregates in the coating liquid, and the smoothness between the food and the resin layer 3 may not be sufficiently exhibited.
  • the content of the filler in the resin layer 3 is not particularly limited, but is preferably 1 part by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the resin as the main component of the resin layer 3.
  • the upper limit of the content of the filler is more preferably 15 parts by weight, and still more preferably 10 parts by weight.
  • the lower limit of the content of the filler is more preferably 3 parts by weight, and still more preferably 5 parts by weight.
  • the printing unit 4 is not particularly limited, but a printing unit in which a pigment is fixed to the base layer 2 with a binder can be employed.
  • the pigment is not particularly limited, and black pigments, white pigments, red pigments, blue pigments, yellow pigments, green pigments, orange pigments, purple pigments, and the like can be used.
  • the binder is not particularly limited, but acrylic resin, styrene resin, polyester resin, urethane resin, polyvinyl resin, alkyd resin, petroleum resin, ketone resin, epoxy resin, melamine
  • synthetic resins such as a resin, a fluorine resin, a silicone resin, a fiber derivative, and a rubber resin, a copolymer, and the like can be employed.
  • 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 15000 g / m 2 24 hr or less.
  • Moisture permeability limit of food packaging sheet 1 is more preferably 13000 g / m 2, more preferably 11 000 g / m 2.
  • the moisture permeability lower limit of the food packaging sheet 1 is more preferably 1000 g / m 2, more preferably 4000g / m 2, 7000g / m 2 is particularly preferred.
  • the moisture permeability is less than the above lower limit
  • water droplets adhere to the inner surface of the food packaging sheet, and the water droplets adhere to the food, resulting in a food texture. May be damaged.
  • the moisture permeability exceeds the upper limit, moisture may be excessively released from the food when cooked in a packaged state, and depending on the food, the texture may be impaired.
  • the oil shielding property from one side of the food packaging sheet 1 to the other is not particularly limited, but is preferably 1 hour or longer, more preferably 1.5 hours or longer, and even more preferably 2 hours or longer.
  • the oil shielding property is less than the above lower limit, there is a possibility that oil penetration cannot be prevented accurately.
  • the manufacturing method of the food packaging sheet 1 of the first embodiment will be described below.
  • 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, and (c) a resin on the inner surface of the base layer 2.
  • an aqueous emulsion or aqueous dispersion coating solution containing a resin composition containing a carbonyl group-containing resin as a main component is prepared.
  • This coating solution is prepared by mixing the carbonyl group-containing resin and an aqueous solvent.
  • the aqueous solvent is not particularly limited, and examples thereof include water alone or a mixture of alcohols such as ethanol and propanol and water.
  • the coating liquid may contain a filler or the like as necessary.
  • the resin layer 3 is laminated by applying the coating liquid prepared in the preparing step (b) to one surface of the base layer 2 and further drying and curing it.
  • the method for applying the coating solution to the inner surface of the base layer 2 is not particularly limited, and known methods such as gravure coating, bar coating, knife coating, roll coating, blade coating, and die coating are available. Can be mentioned.
  • the coating amount of the coating solution is preferably set to 0.1 g / m 2 or more 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.
  • As the coating amount of the lower limit in terms of solid content, more preferably 5 g / m 2, particularly preferably 2 g / m 2.
  • the printing step (d) is a step of printing on the other surface of the base layer 2, and various known methods can be employed for this printing method.
  • this printing process (d) may be performed after the said lamination process (c), and may be performed before a lamination process (c).
  • the food packaging sheet 1 can be suitably used for directly packaging food containing fried food (for example, a hamburger or a rice ball containing fried food).
  • the food layer can be packaged with the resin layer 3 as the inner surface (food side), and at this time, the resin layer 3 can accurately prevent the oil from the food from penetrating the outer surface of the food packaging sheet 1. . That is, since the resin layer 3 is formed by application of a coating liquid, pinholes are unlikely to occur, and therefore, it is difficult for oil to penetrate from the inner surface to the outer surface of the food packaging sheet 1. Furthermore, since this coating liquid uses a carbonyl group-containing resin as the main component of the resin component, it is possible to exhibit suitable oil resistance by this carbonyl group. Moreover, since the food packaging sheet 1 is an oil-resistant paper in which the base layer 2 contains a fluorine-based additive, the oil resistance of the food packaging sheet 1 can be further improved, and the penetration of oil can be more accurately performed. Can be prevented.
  • the resin layer 3 is formed not by a coating solution using a solvent but by a coating solution of an aqueous emulsion or an aqueous dispersion, the resin layer 3 is formed on the inner surface (food side) without any other treatment. It can be arranged. Furthermore, since this coating liquid uses a carbonyl group-containing resin as the main component of the resin component, it can be appropriately dispersed in water when the coating liquid is adjusted with this carbonyl group.
  • the said food packaging sheet 1 has the printing part 4 in the outer surface of the base layer 2, the outer surface of the food packaging sheet 1 is visually recognized by performing different printing for every kind of food to package, for example. You can just identify the type of food.
  • the food packaging sheet 10 of the second embodiment is similar to the first embodiment in the base layer 2, the resin layer 3 laminated on one surface (inner surface) of the base layer 2, and the other of the resin layers 13. And a printing unit 4 stacked on the surface (outer surface) side. And the food packaging sheet 10 of 2nd embodiment is further provided with the other resin layer 13 (henceforth a 2nd resin layer) laminated
  • the second resin layer 13 is disposed between the base material layer 2 and the printing unit 4. In other words, the printing unit 4 is laminated on the other surface of the second resin layer 13.
  • the second resin layer 13 may have the same configuration as the resin layer 3 formed on one surface of the base layer 2, a detailed description thereof will be omitted.
  • the food packaging sheet 10 of the second embodiment can be manufactured by a method substantially similar to the manufacturing method of 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, and (c) an inner surface and an outer surface of the base layer 2. Each includes a laminating step of laminating the resin layers 3 and 13 and (d) a printing step of forming the printing unit 4.
  • the resin layers 3 and 13 on the inner surface and the outer surface can be formed simultaneously in the same procedure, or can be formed in different procedures.
  • 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 oil resistance can be easily controlled.
  • the printing unit is not an essential component in the present invention. Moreover, even when providing a printing part, it is not limited to the thing of said 1st and 2nd embodiment. That is, for example, a food packaging sheet 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 within the scope of the present invention. Moreover, what employ
  • the foodstuff whose packaging target object contains a fried food was demonstrated, this invention is not limited to this.
  • the food containing fried food may be fried food such as fried chicken.
  • Example 1 As the base layer, oil-resistant paper (trade name “EC oil-resistant paper” manufactured by Tenma Special Paper Co., Ltd.) having a basis weight of 25 g / m 2 was used. A coating agent (trade name “Herville B-7”: manufactured by Daiichi Paints Co., Ltd.) was diluted with water to prepare a coating solution, and this coating solution was applied to one side of the oil-resistant paper. . The coating amount of the coating liquid was 1 g / m 2 in terms of solid content. This coating solution was dried and cured to obtain a food packaging sheet of Example 1.
  • oil-resistant paper trade name “EC oil-resistant paper” manufactured by Tenma Special Paper Co., Ltd.
  • a coating agent (trade name “Herville B-7”: manufactured by Daiichi Paints Co., Ltd.) was diluted with water to prepare a coating solution, and this coating solution was applied to one side of the oil-resistant paper. .
  • the coating amount of the coating liquid was 1 g / m 2 in terms
  • Example 2 The coating liquid was similarly applied to the other surface of the food packaging sheet of Example 1, and the coating liquid was dried and cured to obtain the food packaging sheet of Example 2.
  • Example 3 As the base layer, oil-resistant paper (trade name “EC oil-resistant paper” manufactured by Tenma Special Paper Co., Ltd.) having a basis weight of 25 g / m 2 was used. A coating agent (trade name “Herville B-7”: manufactured by Daiichi Paints Co., Ltd.) was diluted with water to prepare a coating solution, and this coating solution was applied to both sides of the above oil-resistant paper. . The coating amount (total on both sides) of the coating solution was 4 g / m 2 in terms of solid content. This coating solution was dried and cured to obtain a food packaging sheet of Example 3.
  • oil-resistant paper trade name “EC oil-resistant paper” manufactured by Tenma Special Paper Co., Ltd.
  • a coating agent (trade name “Herville B-7”: manufactured by Daiichi Paints Co., Ltd.) was diluted with water to prepare a coating solution, and this coating solution was applied to both sides of the above oil-resistant paper. . The coating amount (total on both sides) of
  • Example 4 A food packaging sheet of Example 4 was obtained by the same method as in Example 3 except that the coating amount (total on both sides) was 7 g / m 2 in terms of solid content.
  • Comparative Example 1 As Comparative Example 1, the same oil resistant paper as in Example 1 and Example 2 was used. As Comparative Example 2, a product packaging sheet of Comparative Example 2 was obtained by laminating a polyethylene film having an average thickness of 8 ⁇ m to thin paper (“HS21 paper” from Oji Paper Co., Ltd.).
  • Oil shielding test Examples 1 and 2 and the comparative example were subjected to an oil shielding test.
  • this oil shielding test 3 g of salad oil was dropped onto the resin layer under the condition of 40 ° C., and the time required for the back-through was measured.
  • salad oil was dropped on the surface on which the resin layer was formed.
  • Example 3 and 4 g of salad oil was dripped at the resin layer on 40 degreeC conditions, and the time required for a back-through was measured.
  • the oil did not break through even after 2 hours. That is, it was found that Examples 3 and 4 also had higher oil shielding properties than Comparative Example 1.
  • Example 1 the water vapor transmission rate was 10600 g / m 2 24 hr.
  • Example 2 the water vapor transmission rate was 8500 g / m 2 24 hr.
  • Example 3 the water vapor transmission rate was 4300 g / m 2 24 hr.
  • the moisture permeability was 350 g / m 2 24 hr.
  • Comparative Example 1 the moisture permeability was 13600 g / m 2 24 hr.
  • the water vapor transmission rate was 96 g / m 2 24 hr.
  • Examples 1 to 4 exhibited a suitable range of moisture permeability despite the high oil shielding properties as described above.
  • the food packaging sheets of Examples 1 to 4 and Comparative Examples 1 and 2 have a phenomenon that oil penetrates into the outer surface. In addition, no water droplets adhered to the inner surface of the food packaging sheet when cooked in a microwave oven. On the other hand, in the food packaging sheet of Comparative Example 1, a phenomenon in which oil penetrated into the outer surface occurred. Moreover, in the food packaging sheet of Comparative Example 2, water droplets adhered to the inner surface of the product packaging sheet when cooked with a microwave oven.
  • the food packaging sheet of the present invention since the food packaging sheet of the present invention has excellent oil resistance, it can be suitably used for packaging food containing fried food.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wrappers (AREA)
  • Laminated Bodies (AREA)
  • Packging For Living Organisms, Food Or Medicinal Products That Are Sensitive To Environmental Conditiond (AREA)
  • Paper (AREA)

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

食品用包装シート及び食品用包装シートの製造方法Food packaging sheet and method for producing food packaging sheet
　本発明は、食品用包装シート及び食品用包装シートの製造方法に関する。 The present invention relates to a food packaging sheet and a method for producing a food packaging sheet.
　従来から食品用包装シートは種々の食品を包装する際に用いられており、揚げ物等を含む食品を包装する食品用包装シートとして耐油紙が用いられている。この食品用包装シートにあっては、耐油紙の内面にポリエチレンからなる樹脂層をラミネートし、外面に印刷が施されたものが用いられている（従来例１）。 Conventionally, food packaging sheets have been used for packaging various foods, and oil-resistant paper has been used as food packaging sheets for packaging foods including fried foods. In this food packaging sheet, a sheet is used in which a resin layer made of polyethylene is laminated on the inner surface of an oil-resistant paper and the outer surface is printed (conventional example 1).
　また、上記のように揚げ物等を含む食品を包装する食品用包装シートとしては、特開２０１０－３６９５１号公報所載のものが提案されている。この公報所載の食品用包装シートは、耐油紙の内面に吸油吸水紙をラミネートしたものである（従来例２）。 As a food packaging sheet for packaging foods containing fried foods as described above, the one described in Japanese Patent Application Laid-Open No. 2010-36951 has been proposed. The food packaging sheet described in this publication is obtained by laminating an oil-absorbing paper on the inner surface of an oil-resistant paper (conventional example 2).
　しかし、上記従来例１の食品用包装シートにあっては、揚げ物等を含む食品を包装した場合に外面に油が浸透する現象が生じている。これは、ラミネートしたポリエチレンの樹脂層にピンホールが生じており、このピンホールから油が浸透しているものと考えられる。 However, in the food packaging sheet of the above-mentioned conventional example 1, there is a phenomenon in which oil permeates the outer surface when food including fried food is packaged. This is presumably because pinholes are formed in the laminated polyethylene resin layer, and oil penetrates from the pinholes.
　また、上記従来例２の食品用包装シートにあっては、内面の吸油吸水紙がある程度の量の油を吸収するものの、所定量以上の油は外面に浸透してしまい、結局、外面に油が浸透する現象を有効に防止することができない。 Further, in the food packaging sheet of the above-described conventional example 2, although the oil-absorbing paper on the inner surface absorbs a certain amount of oil, a predetermined amount or more of oil permeates the outer surface, and eventually the oil on the outer surface It is not possible to effectively prevent the phenomenon of penetration.
特開２０１０－３６９５１号公報JP 2010-36951 A
　本発明は、このような事情に鑑みてなされたものであり、外面への油の浸透を的確に防止することができる食品用包装シート及びこの食品用包装シートの製造方法を提供することを課題とする。 The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a food packaging sheet capable of accurately preventing the permeation of oil to the outer surface and a method for producing the food packaging sheet. And
　上記課題を解決するためになされた本発明に係る食品用包装シートは、
　基層と、
　この基層の一方の面に積層される樹脂層と
　を備え、
　上記樹脂層が、カルボニル基含有樹脂を主成分とする水系エマルジョン又は水系ディスパージョンである塗工液の塗工によって形成されている。 The packaging sheet for food according to the present invention made to solve the above problems is
The base layer,
A resin layer laminated on one surface of the base layer,
The resin layer is formed by application of a coating liquid that is an aqueous emulsion or aqueous dispersion mainly containing a carbonyl group-containing resin.
　当該食品用包装シートは、基層の一方の面に積層される樹脂層が塗工液の塗工によって形成されているので、この樹脂層にピンホールが生じ難く、このため当該食品用包装シートの一方から他方にかけて油が浸透し難い。また、この樹脂層は、溶剤を用いる塗工液ではなく水系エマルジョン又は水系ディスパージョンである塗工液によって形成されるので、食品との接触面に上記樹脂層を配設し易い。さらに、この塗工液はカルボニル基含有樹脂を主成分とするものを用いているので、このカルボニル基によって、上記塗工液を調整する際に水に適度に分散等することができるとともに、形成された樹脂層が好適な耐油性を発揮し得る。 In the food packaging sheet, since the resin layer laminated on one surface of the base layer is formed by application of the coating liquid, pinholes are hardly formed in the resin layer. Oil hardly penetrates from one to the other. Moreover, since this resin layer is formed not by a coating solution using a solvent but by a coating solution that is an aqueous emulsion or aqueous dispersion, it is easy to dispose the resin layer on the contact surface with food. Furthermore, since this coating solution uses a carbonyl group-containing resin as a main component, the carbonyl group can be appropriately dispersed in water when the coating solution is prepared and formed. The formed resin layer can exhibit suitable oil resistance.
　当該食品用包装シートは、上記基層の他方の面に積層される他の樹脂層をさらに備え、この他の樹脂層が、カルボニル基含有樹脂を主成分とする水系エマルジョン又は水系ディスパージョンである塗工液の塗工によって形成されている構成を採用可能である。この構成を採用することによって、基層の両面の樹脂層によって好ましい透湿度に容易且つ確実に調節することが可能となり、食品を包装状態のまま電子レンジ等によって加熱調理した際に好適な食感を維持しつつ加熱することができる。つまり、例えば従来例１の食品用包装シートにあっては透湿度が低く、仮に包装状態のまま食品を電子レンジによって加熱した場合に、食品用包装シートの内面に水滴が付着し、その水滴が食品に付着してしまい食品の食感を損なう。一方、透湿度が余りにも高いと、包装状態のまま加熱調理した際に食品から水分が放出され過ぎて、食品によっては却って食感を損ねるおそれがある。このため、上記のように透湿度が容易且つ確実に調節可能な当該食品用包装シートを用いることで、食品ごとに加熱調理に適した包装状態を得ることができる。 The food packaging sheet further includes another resin layer laminated on the other side of the base layer, and the other resin layer is a water-based emulsion or water-based dispersion mainly containing a carbonyl group-containing resin. It is possible to adopt a configuration formed by coating with a working liquid. By adopting this configuration, the resin layer on both sides of the base layer can be easily and surely adjusted to a preferred moisture permeability, and a suitable texture is obtained when the food is cooked in a microwave oven or the like in a packaged state. It can be heated while maintaining. That is, for example, in the food packaging sheet of Conventional Example 1, when the food is heated by a microwave oven in a packaging state, water droplets adhere to the inner surface of the food packaging sheet, and the water droplets It adheres to food and impairs the food texture. On the other hand, if the moisture permeability is too high, moisture is excessively released from the food when cooked in the packaged state, and depending on the food, the texture may be impaired. For this reason, the packaging state suitable for heat cooking can be obtained for every food by using the said food packaging sheet which can adjust moisture permeability easily and reliably as mentioned above.
　当該食品用包装シートは、上記基層の他方の面側に配設される印刷部をさらに備える構成を採用可能である。この構成を採用することによって、例えば包装する食品の種類ごとに異なった印刷を行い、食品用包装シートの外面を視認することで食品の種類を識別することができる。 The food packaging sheet may employ a configuration further including a printing unit disposed on the other surface side of the base layer. By adopting this configuration, for example, different types of printing can be performed for each type of food to be packaged, and the type of food can be identified by visually recognizing the outer surface of the food packaging sheet.
　当該食品用包装シートは、上記基層が、フッ素系添加物を含有する耐油紙である構成を採用可能である。この構成を採用することによって、当該食品用包装シートの耐油性をより向上させることができ、油の浸透をより的確に防止することができる。 The food packaging sheet can employ a configuration in which the base layer is oil-resistant paper containing a fluorine-based additive. By adopting this configuration, the oil resistance of the food packaging sheet can be further improved, and oil penetration can be prevented more accurately.
　当該食品用包装シートは、透湿度が２００ｇ／ｍ２２４ｈｒ以上１５０００ｇ／ｍ２２４ｈｒ以下である構成を採用可能である。この構成を採用することによって、当該食品用包装シートによって包装した食品を、包装状態のまま電子レンジ等で加熱した際に、食品から生ずる水蒸気を好適に外部に放出することができる。このため、電子レンジ等で加熱調理しても食感が損なわれ難い。 The said food packaging sheet can employ | adopt the structure whose water vapor transmission rate is 200 g / m < 2 > 24hr or more and 15000g / m < 2 > 24hr or less. By adopting this configuration, when the food packaged by the food packaging sheet is heated in a microwave oven or the like in a packaged state, water vapor generated from the food product can be suitably released to the outside. For this reason, even if it cooks with a microwave oven etc., a food texture is hard to be impaired.
　当該食品用包装シートは、一方から他方にかけての油の遮蔽性が１時間以上である構成を採用可能である。この構成を採用することによって、上記油の浸透をさらに効果的に防止することができる。 The food packaging sheet can employ a configuration in which the oil shielding property from one to the other is 1 hour or more. By adopting this configuration, the penetration of the oil can be more effectively prevented.
　また、本発明に係る食品用包装シートの製造方法は、
　カルボニル基含有樹脂を主成分とする水系エマルジョン又は水系ディスパージョンである塗工液を調整する工程、及び
　この塗工液を耐油性を有する基層の一方の面に塗工することで、耐油樹脂層を形成する工程と
　を備える。 Moreover, the method for producing a food packaging sheet according to the present invention comprises:
A step of preparing a coating liquid which is a water-based emulsion or a water-based dispersion mainly composed of a carbonyl group-containing resin, and by applying this coating liquid to one surface of a base layer having oil resistance, an oil-resistant resin layer Forming a step.
　当該製造方法によれば、既述の当該食品用包装シートを製造することができ、既述の利点を奏することができる。つまり、当該製造方法によって製造された食品用包装シートは、樹脂層にピンホールが生じ難く、当該食品用包装シートの一方から他方にかけて油が浸透し難い。また、この樹脂層は水系エマルジョン又は水系ディスパージョンの塗工液によって形成されるので、食品との接触面に上記樹脂層を配設し易い。さらに、この塗工液は樹脂成分の主成分としてカルボニル基含有樹脂を用いているので、上記塗工液を調整する際に水に適度に分散等することができるとともに、形成された樹脂層が好適な耐油性を発揮し得る。 According to the manufacturing method, the food packaging sheet described above can be manufactured, and the advantages described above can be achieved. That is, the food packaging sheet produced by the production method is unlikely to have pinholes in the resin layer, and the oil hardly penetrates from one side of the food packaging sheet to the other. Moreover, since this resin layer is formed with the coating liquid of a water-based emulsion or a water-based dispersion, it is easy to arrange | position the said resin layer on the contact surface with foodstuffs. Furthermore, since this coating solution uses a carbonyl group-containing resin as the main component of the resin component, it can be appropriately dispersed in water when adjusting the coating solution, and the formed resin layer Suitable oil resistance can be exhibited.
　なお、「透湿度」は、カップ法（ＪＩＳＺ０２０８）に準じて測定した値をいう。また、「油の遮蔽性」は、４０℃の条件下で３ｇのサラダ油を樹脂層に滴下し、裏抜けに要する時間を測定した値である。 In addition, “moisture permeability” refers to a value measured according to the cup method (JISZ0208). The “oil shielding property” is a value obtained by dropping 3 g of salad oil onto the resin layer under the condition of 40 ° C. and measuring the time required for back-through.
　以上説明したように、本発明に係る食品用包装シートは、外面への油の浸透を的確に防止することができ、また本発明に係る食品用包装シートの製造方法は、上記効果を奏する食品用包装シートを製造することができる。 As described above, the food packaging sheet according to the present invention can accurately prevent the permeation of oil to the outer surface, and the method for producing a food packaging sheet according to the present invention has the above effects. Packaging sheets can be produced.
本発明の第一実施形態に係る食品用包装シートの模式的断面図である。1 is a schematic cross-sectional view of a food packaging sheet according to a first embodiment of the present invention. 本発明の第二実施形態に係る食品用包装シートの模式的断面図である。It is a typical sectional view of the packaging sheet for foods concerning a second embodiment of the present invention.
　以下、適宜図面を参照しつつ、本発明の実施の形態を詳説する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
［第一実施形態］
（食品用包装シート）
　本発明の第一実施形態の食品用包装シート１は、図１に示すように、基層２と、この基層２の一方の面（内面）に積層された樹脂層３と、基層２の他方の面（外面）に形成された印刷部４とを備えている。 [First embodiment]
(Packaging sheet for food)
As shown in FIG. 1, the food packaging sheet 1 of the 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 the other of the base layer 2. And a printing unit 4 formed on the surface (outer surface).
　基層２は、特に限定されるものではないが、パルプ繊維を主成分とするパルプスラリーを抄紙したものが好適に用いられる。このような基層２としては、例えば純白ロール紙、グラシン紙、パラフィン紙、クラフト紙、模造紙、薄葉紙、一般上質紙、和紙等が挙げられる。これらの中でも耐水性や耐油性に優れる点でグラシン紙、パラフィン紙が好ましい。特に、上記基層は、フッ素系添加物を含有する耐油紙であることが好ましい。 The base layer 2 is not particularly limited, but paper made of pulp slurry containing pulp fibers as the main component is preferably used. Examples of such a base layer 2 include pure white roll paper, glassine paper, paraffin paper, craft paper, imitation paper, thin paper, general fine paper, and Japanese paper. Among these, glassine paper and paraffin paper are preferable in terms of excellent water resistance and oil resistance. In particular, the base layer is preferably oil-resistant paper containing a fluorine-based additive.
　上記のように抄紙した基層２は、その坪量が、１５ｇ／ｍ２以上２５ｇ／ｍ２以下が好ましく、１８ｇ／ｍ２以上２３ｇ／ｍ２以下がより好ましく、２０ｇ／ｍ２以上２２ｇ／ｍ２以下がさらに好ましい。基層２の坪量が上記上限を超えると、基層２の剛度が高くなるため、包装する食品の形状に沿って変形しにくくなり、食品を当該食品用包装シート１によって直接包装することが困難となるおそれがある。一方、基層２の坪量が上記下限未満の場合、強度が低下して破れやすくなるおそれがある。 Paper and base layer 2 as described above, the basis weight, 15 g / m 2 or more 25 g / m 2 or less is preferable, 18 g / m, more preferably 2 or more 23 g / m 2 or less, 20 g / m 2 or more 22 g / m 2 or less is more preferable. If the basis weight of the base layer 2 exceeds the above upper limit, the rigidity of the base layer 2 increases, so that it is difficult to deform along the shape of the food to be packaged, and it is difficult to directly package the food with the food packaging sheet 1. There is a risk. On the other hand, when the basis weight of the base layer 2 is less than the above lower limit, the strength is likely to be lowered and easily broken.
　基層２は、耐油性及び耐水性を向上させるために、フッ素系添加物を含有することが好ましい。フッ素系添加物としては、例えば炭素鎖長が６以下のパーフルオロアルキル基を有する化合物を含有する組成物等が挙げられる。炭素鎖長が６以下のパーフルオロアルキル基を有する化合物のうち、炭素鎖長が大きいものほど耐油性に優れる点で好ましく、炭素鎖長が５又は６のパーフルオロアルキル基を有する化合物がより好ましい。なお、パーフルオロアルキル基の炭素鎖長が７以上の場合、環境への負荷が増すおそれがあるため好ましくない。上記フッ素系添加物は市販品を用いても良く、市販品としては例えば旭硝子社製の商品名「ＡＧ－Ｅ０６０」等が挙げられる。 The base layer 2 preferably contains a fluorine-based additive in order to improve oil resistance and water resistance. Examples of the fluorine-based additive include a composition containing a compound having a perfluoroalkyl group having a carbon chain length of 6 or less. Of the compounds having a perfluoroalkyl group having a carbon chain length of 6 or less, those having a larger carbon chain length are preferable in terms of excellent oil resistance, and compounds having a perfluoroalkyl group having a carbon chain length of 5 or 6 are more preferable. . In addition, when the carbon chain length of the perfluoroalkyl group is 7 or more, there is a possibility that the load on the environment may increase, such being undesirable. Commercially available products may be used as the fluorine-based additive. Examples of commercially available products include “AG-E060” manufactured by Asahi Glass Co., Ltd.
　基層２におけるフッ素系添加物の含有量は、固形分換算で０．１ｇ／ｍ２以上１．０ｇ／ｍ２以下が好ましく、０．３ｇ／ｍ２以上０．７ｇ／ｍ２以下がより好ましい。基層２におけるフッ素系添加物の含有量が上記上限を超えると、基層２の剛度が高くなることによって、食品の形状に沿って包装しにくくなるおそれがある。一方、基層２におけるフッ素系添加物の含有量が上記下限未満の場合、十分な耐油性が得られないおそれがある。 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, 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, the base layer 2 may have a high rigidity, which may make it difficult to package along the shape of the food. On the other hand, when the content of the fluorine-based additive in the base layer 2 is less than the lower limit, sufficient oil resistance may not be obtained.
　基層２にフッ素系添加物を含有させる方法としては、例えば基層２を、フッ素系添加物を含有する溶液に含浸させたり、基層２の少なくとも片面にフッ素系添加物を含む塗工液を塗工したりする方法等が挙げられる。基層２の表面にフッ素系添加物を含む塗工液を塗工する場合、抄紙機に付属する塗工機でオンマシン塗工しても良いし、抄紙機と切り離された塗工機でオフマシン塗工を行っても良い。 Examples of the method for containing the fluorine-based additive in the base layer 2 include impregnating the base layer 2 with a solution containing the fluorine-based additive, or applying a coating solution containing the fluorine-based additive on at least one surface of the base layer 2. And the like. When coating a coating solution containing a fluorine-based additive on the surface of the base layer 2, it may be applied on-machine with a coating machine attached to the paper machine, or off with a coating machine separated from the paper machine. Machine coating may be performed.
　樹脂層３は、カルボニル基含有樹脂を主成分とする樹脂組成物が含まれる水系エマルジョン又は水系ディスパージョンの塗工液の塗工によって形成される。上記カルボニル基含有樹脂としては、例えばスチレン・アクリル酸エステル共重合体、エポキシエステル樹脂、ウレタン樹脂、オイル変性フェノール樹脂等が挙げられる。 The resin layer 3 is formed by application of an aqueous emulsion or aqueous dispersion coating liquid containing a resin composition containing a carbonyl group-containing resin as a main component. Examples of the carbonyl group-containing resin include styrene / acrylic acid ester copolymers, epoxy ester resins, urethane resins, and oil-modified phenol resins.
　上記スチレン・アクリル酸エステル共重合体は、特に限定されるものではないが、公知の乳化重合法によって製造することができる。ここで、乳化重合法による場合、一定の親水性を得るために界面活性剤が用いられることが好ましい。この界面活性剤としては、脂肪酸石鹸、アルキルスルホン酸塩、アルキルベンゼンスルホン酸塩、アルキルスルホコハク酸塩、ポリオキシエチレンアルキル硫酸塩等のアニオン活性剤が挙げられる。この界面活性剤は、モノマー混合物１００重量部に対して１重量部以上１０重量部以下用いられることが好ましい。 The styrene / acrylic acid ester copolymer is not particularly limited, but can be produced by a known emulsion polymerization method. Here, in the case of the emulsion polymerization method, it is preferable to use a surfactant in order to obtain a certain hydrophilicity. Examples of the surfactant include anionic surfactants such as fatty acid soaps, alkyl sulfonates, alkyl benzene sulfonates, alkyl sulfosuccinates, and polyoxyethylene alkyl sulfates. This surfactant is preferably used in an amount of 1 to 10 parts by weight based on 100 parts by weight of the monomer mixture.
　上記エポキシエステル樹脂は、種々のものが採用可能であり、エポキシ樹脂とカルボキシル基を含有する化合物との反応によって、オキシラン環の開環を伴うエステル化を生じさせることで得ることができる。 Various types of epoxy ester resins can be employed, and can be obtained by causing esterification with ring opening of the oxirane ring by reaction of the epoxy resin and a compound containing a carboxyl group.
　上記ウレタン樹脂は、特に限定されるものではないが、例えばポリイソシアネートとポリオールとを重合させたものを採用可能である。上記ポリオールとしては、例えばポリエーテルポリオール、ポリエステルポリオール、ポリラクトンポリオール、ポリカーボネートポリオール等が挙げられる。 The urethane resin is not particularly limited. For example, a polymer obtained by polymerizing polyisocyanate and polyol can be used. Examples of the polyol include polyether polyol, polyester polyol, polylactone polyol, and polycarbonate polyol.
　上記イソシアネートは、特に限定されるものではないが、例えばヘキサメチレンジイソシアネート、２，２，４－トリメチルヘキサメチレンジイソシアネート等の脂肪族ジイソシアネート化合物、イソホロンジイソシアネート、水添キシリレンジイソシアネート、１，４－シクロヘキサンジイソシアネート、４，４′－ジシクロヘキシルメタンジイソシアネート等の脂環式ジイソシアネート化合物、キシリレンジイソシアネート、テトラメチルキシレンジイソシアネート等の芳香脂肪族ジイソシアネート化合物、トルイレンジイソシアネート、フェニルメタンジイソシアネート等の芳香族ジイソシアネート化合物、上記ジイソシアネートの変性物（カルボジイミド、ウレトジオン、ウレトイミン含有変成物など）等が採用可能である。 The isocyanate is not particularly limited, but examples thereof include aliphatic diisocyanate compounds such as hexamethylene diisocyanate and 2,2,4-trimethylhexamethylene diisocyanate, isophorone diisocyanate, hydrogenated xylylene diisocyanate, and 1,4-cyclohexane diisocyanate. Alicyclic diisocyanate compounds such as 4,4'-dicyclohexylmethane diisocyanate, araliphatic diisocyanate compounds such as xylylene diisocyanate and tetramethylxylene diisocyanate, aromatic diisocyanate compounds such as toluylene diisocyanate and phenylmethane diisocyanate, Modified products (carbodiimide, uretdione, uretoimine-containing modified products, etc.) can be employed.
　上記ポリエーテルポリオールは、特に限定されるものではないが、例えばポリエチレングリコール、ポリプロピレングリコール、ポリテトラメチレンエーテルグリコール、ポリヘキサメチレンエーテルグリコール等を採用可能である。 The polyether polyol is not particularly limited, and for example, polyethylene glycol, polypropylene glycol, polytetramethylene ether glycol, polyhexamethylene ether glycol and the like can be employed.
　上記ポリエステルポリオールは、特に限定されるものではないが、例えばポリエチレンアジペート、ポリブチレンアジペート、ポリネオペンチルアジペート、ポリ－３－メチルペンチルアジペート、ポリエチレン／ブチレンアジペート、ポリネオペンチル／ヘキシルアジペート等を採用可能である。 The polyester polyol is not particularly limited. For example, polyethylene adipate, polybutylene adipate, polyneopentyl adipate, poly-3-methylpentyl adipate, polyethylene / butylene adipate, polyneopentyl / hexyl adipate, etc. can be used. It is.
　上記ポリラクトンポリオールは、特に限定されるものではないが、例えばポリカプロラクトンジオール、ポリオメガヒドロキシカプロン酸ポリオール等を採用可能である。 The polylactone polyol is not particularly limited, and for example, polycaprolactone diol, polyomegahydroxycaproic acid polyol, and the like can be used.
　上記ポリカーボネートポリオールは、特に限定されるものではないが、例えばプロパンジオール－（１，３）、ブタンジオール－（１，４）、ヘキサンジオール－（１，６）、ジエチレングリコール、トリエチレングリコール、テトラエチレングリコール等のジオールと、ホスゲンと、ジフェニルカーボネート等のジアリールカーボネート又はエチレンカーボネート、プロピレンカーボネート等の環状カーボネートとの反応で得られる生成物等を採用可能である。また、上記ポリカーボネートポリオールとしては、ポリエステル又はポリラクトンと、ホスゲンと、ジアリールカーボネート又は環状カーボネートとの反応によって得られるポリエステルカーボネートが挙げられる。 The polycarbonate polyol is not particularly limited. For example, propanediol- (1,3), butanediol- (1,4), hexanediol- (1,6), diethylene glycol, triethylene glycol, tetraethylene A product obtained by reacting a diol such as glycol with phosgene and a diaryl carbonate such as diphenyl carbonate or a cyclic carbonate such as ethylene carbonate or propylene carbonate can be employed. Moreover, as said polycarbonate polyol, the polyester carbonate obtained by reaction of polyester or polylactone, phosgene, and a diaryl carbonate or a cyclic carbonate is mentioned.
　上記オイル変性フェノール樹脂は、特に限定されるものではないが、例えばフェノール類、アルデヒド類及びオイルを酸性触媒下で反応させて得られる樹脂を採用可能である。 The oil-modified phenol resin is not particularly limited, and for example, a resin obtained by reacting phenols, aldehydes and oil under an acidic catalyst can be used.
　変性に用いられるオイルは、特に限定されないが、例えば植物オイル、特に、カシューオイル、アマニオイル、桐オイル、ヒマシオイル及びトールオイルから選ばれる１種以上を採用可能である。この中でも保存安定性の点からカシューオイルが好ましい。また、上記オイル変性フェノール樹脂としては、カシューオイル変性ノボラック型フェノール樹脂を採用することが好ましい。 The oil used for modification is not particularly limited, and for example, one or more selected from vegetable oils, particularly cashew oil, linseed oil, paulownia oil, castor oil and tall oil can be employed. Among these, cashew oil is preferable from the viewpoint of storage stability. As the oil-modified phenol resin, it is preferable to employ a cashew oil-modified novolac type phenol resin.
　樹脂層３は、包装する食品と樹脂層３との平滑性（樹脂層３が食品に引っ付くことを防止する効果）を担保するためにフィラーを含有することも可能である。樹脂層３に含有されるフィラーは、特に限定されるものではないが、無機微粒子や有機微粒子が挙げられる。樹脂層３に含有されるフィラーとしては、珪酸アルミニウムが好適に用いられ、その他、シリカ、硫酸バリウム、酸化チタン等を用いることも可能である。上記フィラーは、１種のみを用いてもよく、また２種以上を混合して用いてもよい。 The resin layer 3 may contain a filler in order to ensure smoothness between the food to be packaged and the resin layer 3 (an effect of preventing the resin layer 3 from being caught on the food). The filler contained in the resin layer 3 is not particularly limited, and examples thereof include inorganic fine particles and organic fine particles. As the filler contained in the resin layer 3, aluminum silicate is preferably used, and silica, barium sulfate, titanium oxide, or the like can also be used. Only 1 type may be used for the said filler and it may mix and use 2 or more types.
　上記フィラーの平均粒子径としては、特に限定されないが、５０ｎｍ以上５００ｎｍ以下が好ましい。上記フィラーの平均粒子径の上限は、３５０ｎｍがより好ましく、３００ｎｍがさらに好ましい。上記フィラーの平均粒子径の下限は、６０ｎｍがより好ましく、８０ｎｍがさらに好ましい。上記フィラーの平均粒子径が上記上限を超える場合、食品と樹脂層３との平滑性の向上があまり得られないおそれある。逆に、上記フィラーの平均粒子径が上記下限未満の場合、フィラーが塗工液内で凝集してしまい、食品と樹脂層３との平滑性が十分に発揮されないおそれがある。 The average particle size 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 size of the filler is more preferably 350 nm, and even more preferably 300 nm. The lower limit of the average particle size of the filler is more preferably 60 nm, and still more preferably 80 nm. When the average particle diameter of the filler exceeds the upper limit, the smoothness between the food and the resin layer 3 may not be improved much. On the contrary, when the average particle diameter of the filler is less than the lower limit, the filler aggregates in the coating liquid, and the smoothness between the food and the resin layer 3 may not be sufficiently exhibited.
　樹脂層３における上記フィラーの含有量は、特に限定されないが、樹脂層３の主成分の樹脂１００重量部に対して１重量部以上２０重量部以下であるが好ましい。上記フィラーの含有量の上限は、１５重量部がより好ましく、１０重量部がさらに好ましい。また、上記フィラーの含有量の下限は、３重量部がより好ましく、５重量部がさらに好ましい。上記フィラーの含有量が上記上限を超える場合、食品と樹脂層３との平滑性の向上があまり得られなくなるおそれがある。逆に、上記フィラーの含有量が上記下限未満の場合、フィラーの密度が低下し、食品と樹脂層３との平滑性が十分に発揮されないおそれがある。 The content of the filler in the resin layer 3 is not particularly limited, but is preferably 1 part by weight or more and 20 parts by weight or less with respect to 100 parts by weight of the resin as the main component of the resin layer 3. The upper limit of the content of the filler is more preferably 15 parts by weight, and still more preferably 10 parts by weight. Further, the lower limit of the content of the filler is more preferably 3 parts by weight, and still more preferably 5 parts by weight. When content of the said filler exceeds the said upper limit, there exists a possibility that the improvement of the smoothness of a foodstuff and the resin layer 3 may not be obtained so much. On the contrary, when the content of the filler is less than the lower limit, the density of the filler is lowered, and the smoothness between the food and the resin layer 3 may not be sufficiently exhibited.
　印刷部４は、特に限定されるものではないが、基層２にバインダーによって顔料が固定されたものを採用可能である。この顔料は、特に限定されるものではないが、黒色顔料、白色顔料、赤色顔料、青色顔料、黄色顔料、緑色顔料、橙色顔料、紫色顔料等を用いることができる。また、バインダーは、特に限定されるものではないが、アクリル系樹脂、スチレン系樹脂、ポリエステル系樹脂、ウレタン系樹脂、ポリビニル系樹脂、アルキド系樹脂、石油系樹脂、ケトン樹脂、エポキシ系樹脂、メラミン系樹脂、フッ素系樹脂、シリコーン系樹脂、繊維素誘導体、ゴム系樹脂等の各種合成樹脂の１種又は２種以上の混合物、共重合体等を採用可能である。 The printing unit 4 is not particularly limited, but a printing unit in which a pigment is fixed to the base layer 2 with a binder can be employed. The pigment is not particularly limited, and black pigments, white pigments, red pigments, blue pigments, yellow pigments, green pigments, orange pigments, purple pigments, and the like can be used. The binder is not particularly limited, but acrylic resin, styrene resin, polyester resin, urethane resin, polyvinyl resin, alkyd resin, petroleum resin, ketone resin, epoxy resin, melamine One kind or a mixture of two or more kinds of synthetic resins such as a resin, a fluorine resin, a silicone resin, a fiber derivative, and a rubber resin, a copolymer, and the like can be employed.
　食品用包装シート１の透湿度は、特に限定されないが、２００ｇ／ｍ２２４ｈｒ以上１５０００ｇ／ｍ２２４ｈｒ以下が好ましい。食品用包装シート１の透湿度の上限は、１３０００ｇ／ｍ２がより好ましく、１１０００ｇ／ｍ２がさらに好ましい。また、食品用包装シート１の透湿度の下限は、１０００ｇ／ｍ２がより好ましく、４０００ｇ／ｍ２がさらに好ましく、７０００ｇ／ｍ２が特に好ましい。上記透湿度が上記下限未満であると、包装状態のまま食品を電子レンジによって加熱した場合に、食品用包装シートの内面に水滴が付着し、その水滴が食品に付着してしまい食品の食感を損なうおそれがある。逆に、上記透湿度が上記上限を超えると、包装状態のまま加熱調理した際に食品から水分が放出され過ぎて、食品によっては却って食感を損ねるおそれがある。 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 15000 g / m 2 24 hr or less. Moisture permeability limit of food packaging sheet 1 is more preferably 13000 g / m 2, more preferably 11 000 g / m 2. Further, the moisture permeability lower limit of the food packaging sheet 1 is more preferably 1000 g / m 2, more preferably 4000g / m 2, 7000g / m 2 is particularly preferred. When the moisture permeability is less than the above lower limit, when the food is heated in a packaged state with a microwave oven, water droplets adhere to the inner surface of the food packaging sheet, and the water droplets adhere to the food, resulting in a food texture. May be damaged. On the contrary, if the moisture permeability exceeds the upper limit, moisture may be excessively released from the food when cooked in a packaged state, and depending on the food, the texture may be impaired.
　食品用包装シート１の一方から他方にかけての油の遮蔽性としては、特に限定されないが、１時間以上が好ましく、１．５時間以上がより好ましく、２時間以上がさらに好ましい。上記油の遮蔽性が上記下限未満の場合、油の浸透を的確に防止できないおそれがある。 The oil shielding property from one side of the food packaging sheet 1 to the other is not particularly limited, but is preferably 1 hour or longer, more preferably 1.5 hours or longer, and even more preferably 2 hours or longer. When the oil shielding property is less than the above lower limit, there is a possibility that oil penetration cannot be prevented accurately.
（製造方法）
　この第一実施形態の食品用包装シート１の製造方法について以下説明する。食品用包装シート１の製造方法は、一般的には（ａ）基層２を用意する工程と、（ｂ）樹脂層３の形成材料を調製する調整工程と、（ｃ）基層２の内面に樹脂層３を積層する積層工程と、（ｄ）印刷部４を形成する印刷工程とを有している。 (Production method)
The manufacturing method of the food packaging sheet 1 of the first embodiment will be described below. 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, and (c) a resin on the inner surface of the base layer 2. A laminating step of laminating the layers 3 and (d) a printing step of forming the printing unit 4.
　詳細には、上記調製工程（ｂ）では、カルボニル基含有樹脂を主成分とする樹脂組成物が含まれる水系エマルジョン又は水系ディスパージョンの塗工液を調製する。この塗工液は、上記カルボニル基含有樹脂と、水系溶媒とを混合することによって調製される。この水系溶媒としては、特に限定されず、例えば水単体、又はエタノール、プロパノール等のアルコール類と水との混合物等が挙げられる。また、上記塗工液には、必要に応じてフィラー等が含有されてもよい。 Specifically, in the preparation step (b), an aqueous emulsion or aqueous dispersion coating solution containing a resin composition containing a carbonyl group-containing resin as a main component is prepared. This coating solution is prepared by mixing the carbonyl group-containing resin and an aqueous solvent. The aqueous solvent is not particularly limited, and examples thereof include water alone or a mixture of alcohols such as ethanol and propanol and water. Moreover, the coating liquid may contain a filler or the like as necessary.
　上記積層工程（ｃ）では、上記調製工程（ｂ）によって調整された塗工液を基層２の一方の面に塗工し、さらに乾燥硬化させることによって樹脂層３を積層する。基層２の内面に上記塗工液を塗工する方法としては、特に限定されず、グラビアコート法、バーコート法、ナイフコート法、ロールコート法、ブレードコート法、ダイコート法等の公知の方法が挙げられる。また、上記塗工液の塗工量は、固形分換算で０．１ｇ／ｍ２以上８ｇ／ｍ２以下とすることが好ましい。この塗工量の下限としては、固形分換算で、０．５ｇ／ｍ２がより好ましい。この塗工量の下限としては、固形分換算で、５ｇ／ｍ２がより好ましく、２ｇ／ｍ２が特に好ましい。 In the laminating step (c), the resin layer 3 is laminated by applying the coating liquid prepared in the preparing step (b) to one surface of the base layer 2 and further drying and curing it. The method for applying the coating solution to the inner surface of the base layer 2 is not particularly limited, and known methods such as gravure coating, bar coating, knife coating, roll coating, blade coating, and die coating are available. Can be mentioned. Further, the coating amount of the coating solution is preferably set to 0.1 g / m 2 or more 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. As the coating amount of the lower limit, in terms of solid content, more preferably 5 g / m 2, particularly preferably 2 g / m 2.
　上記印刷工程（ｄ）は、基層２の他方の面に印刷を施す工程であり、この印刷方法は公知の種々の方法を採用可能である。なお、この印刷工程（ｄ）は、上記積層工程（ｃ）の後に行っても良く、積層工程（ｃ）の前に行っても良い。さらには、上記基層を用意する工程（ａ）において既に印刷された基層を用意することで、この印刷工程（ｄ）を行わないことも可能である。 The printing step (d) is a step of printing on the other surface of the base layer 2, and various known methods can be employed for this printing method. In addition, this printing process (d) may be performed after the said lamination process (c), and may be performed before a lamination process (c). Furthermore, it is possible not to perform this printing step (d) by preparing the already printed base layer in the step (a) of preparing the base layer.
（利点）
　当該食品用包装シート１は、揚げ物を含む食品（例えば、ハンバーガーや揚げ物を含むおにぎり等）を直接包装するのに好適に用いることができる。この包装に際して樹脂層３を内面（食品側）として食品を包装することができ、この際に樹脂層３によって食品から出る油が当該食品用包装シート１の外面に浸透することを的確に防止できる。つまり、当該樹脂層３は、塗工液の塗工によって形成されているのでピンホールが生じにくく、このため当該食品用包装シート１の内面から外面に油が浸透しにくい。さらに、この塗工液は樹脂成分の主成分としてカルボニル基含有樹脂を用いているので、このカルボニル基によって好適な耐油性を発揮し得る。しかも、当該食品用包装シート１は、基層２が、フッ素系添加物を含有する耐油紙であるので、当該食品用包装シート１の耐油性をより向上させることができ、油の浸透をより的確に防止することができる。 (advantage)
The food packaging sheet 1 can be suitably used for directly packaging food containing fried food (for example, a hamburger or a rice ball containing fried food). In this packaging, the food layer can be packaged with the resin layer 3 as the inner surface (food side), and at this time, the resin layer 3 can accurately prevent the oil from the food from penetrating the outer surface of the food packaging sheet 1. . That is, since the resin layer 3 is formed by application of a coating liquid, pinholes are unlikely to occur, and therefore, it is difficult for oil to penetrate from the inner surface to the outer surface of the food packaging sheet 1. Furthermore, since this coating liquid uses a carbonyl group-containing resin as the main component of the resin component, it is possible to exhibit suitable oil resistance by this carbonyl group. Moreover, since the food packaging sheet 1 is an oil-resistant paper in which the base layer 2 contains a fluorine-based additive, the oil resistance of the food packaging sheet 1 can be further improved, and the penetration of oil can be more accurately performed. Can be prevented.
　また、この樹脂層３は、溶剤を用いる塗工液ではなく水系エマルジョン又は水系ディスパージョンの塗工液によって形成されるので、特に他の処理を施さずとも樹脂層３を内面（食品側）に配設することができる。さらに、この塗工液は樹脂成分の主成分としてカルボニル基含有樹脂を用いているので、このカルボニル基によって塗工液を調整する際に水に適度に分散等することができる。 Further, since the resin layer 3 is formed not by a coating solution using a solvent but by a coating solution of an aqueous emulsion or an aqueous dispersion, the resin layer 3 is formed on the inner surface (food side) without any other treatment. It can be arranged. Furthermore, since this coating liquid uses a carbonyl group-containing resin as the main component of the resin component, it can be appropriately dispersed in water when the coating liquid is adjusted with this carbonyl group.
　さらに、当該食品用包装シート１は、基層２の外面に印刷部４を有しているので、例えば包装する食品の種類ごとに異なった印刷を行うことによって、食品用包装シート１の外面を視認するだけで食品の種類を識別することができる。 Furthermore, since the said food packaging sheet 1 has the printing part 4 in the outer surface of the base layer 2, the outer surface of the food packaging sheet 1 is visually recognized by performing different printing for every kind of food to package, for example. You can just identify the type of food.
［第二実施形態］
　次に、本発明の第二実施形態の食品用包装シートについて図２を参酌しつつ以下説明するが、この第二実施形態の食品用包装シートの説明において、第一実施形態の部位と同一構成又は機能を奏する部位については同一符号を用いてその説明を省略することがある。 [Second Embodiment]
Next, the food packaging sheet according to the second embodiment of the present invention will be described below with reference to FIG. 2. In the description of the food packaging sheet according to the second embodiment, the same configuration as that of the first embodiment is used. Or about the site | part which has a function, the description may be abbreviate | omitted using the same code | symbol.
　第二実施形態の食品用包装シート１０は、第一実施形態と同様に、基層２と、この基層２の一方の面（内面）に積層された樹脂層３と、この樹脂層１３の他方の面（外面）側に積層された印刷部４とを備えている。そして、第二実施形態の食品用包装シート１０は、基材層２の他方の面（外面）に積層された他の樹脂層１３（以下、第二樹脂層ということがある）をさらに備えている。この第二樹脂層１３は、基材層２と印刷部４との間に配設されており、換言すれば印刷部４は第二樹脂層１３の他方の面に積層されている。 The food packaging sheet 10 of the second embodiment is similar to the first embodiment in the base layer 2, the resin layer 3 laminated on one surface (inner surface) of the base layer 2, and the other of the resin layers 13. And a printing unit 4 stacked on the surface (outer surface) side. And the food packaging sheet 10 of 2nd embodiment is further provided with the other resin layer 13 (henceforth a 2nd resin layer) laminated | stacked on the other surface (outer surface) of the base material layer 2. FIG. Yes. The second resin layer 13 is disposed between the base material layer 2 and the printing unit 4. In other words, the printing unit 4 is laminated on the other surface of the second resin layer 13.
　この第二樹脂層１３は、基層２の一方の面に形成された樹脂層３と同一構成のものを採用することができるため、その詳細な説明は省略する。 Since the second resin layer 13 may have the same configuration as the resin layer 3 formed on one surface of the base layer 2, a detailed description thereof will be omitted.
　この第二実施形態の食品用包装シート１０は、第一実施形態の食品用包装シート１の製造方法と略同様の方法によって製造することができる。つまり、第二実施形態の食品用包装シート１０は、（ａ）基層２を用意する工程と、（ｂ）樹脂層３の形成材料を調製する調整工程と、（ｃ）基層２の内面及び外面それぞれに樹脂層３、１３を積層する積層工程と、（ｄ）印刷部４を形成する印刷工程とを有している。なお、内面及び外面の樹脂層３、１３は同一手順で同時に形成することも可能であり、また別手順でそれぞれ形成することも可能である。 The food packaging sheet 10 of the second embodiment can be manufactured by a method substantially similar to the manufacturing method of 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, and (c) an inner surface and an outer surface of the base layer 2. Each includes a laminating step of laminating the resin layers 3 and 13 and (d) a printing step of forming the printing unit 4. The resin layers 3 and 13 on the inner surface and the outer surface can be formed simultaneously in the same procedure, or can be formed in different procedures.
　この第二実施形態の食品用包装シート１０は、基層２の両面に樹脂層３、１３を有するので、透湿度及び耐油性のコントロールを容易に行うことができる。 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 oil resistance can be easily controlled.
［その他の実施形態］
　上記実施形態は上記構成からなり上述の利点を奏するものであったが、本発明はこれに限定されるものではなく、本発明の意図する範囲内で適宜設計変更可能である。 [Other Embodiments]
The above embodiment has the above-described configuration and has the above-described advantages. However, the present invention is not limited to this, and the design can be changed as appropriate within the intended scope of the present invention.
　つまり、上記実施形態においては印刷部を有するものについて説明したが、本発明において印刷部は必須の構成要件ではない。また、印刷部を設ける場合にあっても上記第一及び第二実施形態のものに限定されるものではない。つまり、例えば基材層の外面に印刷部を設け、この印刷部の外面に樹脂層を積層した食品用包装シートも本発明の意図する範囲内である。また、基層として不織布や織布を採用したものも本発明の意図する範囲内である。 That is, although the above embodiment has been described as having a printing unit, the printing unit is not an essential component in the present invention. Moreover, even when providing a printing part, it is not limited to the thing of said 1st and 2nd embodiment. That is, for example, a food packaging sheet 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 within the scope of the present invention. Moreover, what employ | adopted the nonwoven fabric and the woven fabric as a base layer is also in the range which this invention intends.
　また、上記実施形態においては、包装対象物が揚げ物を含む食品について説明したが、本発明はこれに限定されるものではない。また、揚げ物を含む食品としては、唐揚げ等の揚げ物自体であっても良い。 Moreover, in the said embodiment, although the foodstuff whose packaging target object contains a fried food was demonstrated, this invention is not limited to this. In addition, the food containing fried food may be fried food such as fried chicken.
［実施例］
　次に、当該食品用包装シートの四つの実施例について説明するが、この実施例に本願発明は拘束されるものではない。 [Example]
Next, four examples of the food packaging sheet will be described, but the present invention is not limited to these examples.
（実施例１）
　基層として坪量２５ｇ／ｍ２の耐油紙（商品名「ＥＣ耐油紙」：天間特殊製紙株式会社製）を用いた。塗工剤（商品名「ハービルＢ－７」：株式会社第一塗料製造所製）を水にて希釈して塗工液を調整し、この塗工液を上記耐油紙の片面に塗工した。塗工液の塗工量は、固形分換算で１ｇ／ｍ２とした。この塗工液を乾燥硬化して実施例１の食品用包装シートを得た。 (Example 1)
As the base layer, oil-resistant paper (trade name “EC oil-resistant paper” manufactured by Tenma Special Paper Co., Ltd.) having a basis weight of 25 g / m 2 was used. A coating agent (trade name “Herville B-7”: manufactured by Daiichi Paints Co., Ltd.) was diluted with water to prepare a coating solution, and this coating solution was applied to one side of the oil-resistant paper. . The coating amount of the coating liquid was 1 g / m 2 in terms of solid content. This coating solution was dried and cured to obtain a food packaging sheet of Example 1.
（実施例２）
　実施例１の食品用包装シートの他方の面にも同様に塗工液を塗工し、この塗工液を乾燥硬化して実施例２の食品用包装シートを得た。 (Example 2)
The coating liquid was similarly applied to the other surface of the food packaging sheet of Example 1, and the coating liquid was dried and cured to obtain the food packaging sheet of Example 2.
（実施例３）
　基層として坪量２５ｇ／ｍ２の耐油紙（商品名「ＥＣ耐油紙」：天間特殊製紙株式会社製）を用いた。塗工剤（商品名「ハービルＢ－７」：株式会社第一塗料製造所製）を水にて希釈して塗工液を調整し、この塗工液を上記耐油紙の両面に塗工した。塗工液の塗工量（両面合計）は、固形分換算で４ｇ／ｍ２とした。この塗工液を乾燥硬化して実施例３の食品用包装シートを得た。 (Example 3)
As the base layer, oil-resistant paper (trade name “EC oil-resistant paper” manufactured by Tenma Special Paper Co., Ltd.) having a basis weight of 25 g / m 2 was used. A coating agent (trade name “Herville B-7”: manufactured by Daiichi Paints Co., Ltd.) was diluted with water to prepare a coating solution, and this coating solution was applied to both sides of the above oil-resistant paper. . The coating amount (total on both sides) of the coating solution was 4 g / m 2 in terms of solid content. This coating solution was dried and cured to obtain a food packaging sheet of Example 3.
（実施例４）
　塗工量（両面合計）を固形分換算で７ｇ／ｍ２とした以外は、実施例３と同様の方法によって実施例４の食品包装シートを得た。 Example 4
A food packaging sheet of Example 4 was obtained by the same method as in Example 3 except that the coating amount (total on both sides) was 7 g / m 2 in terms of solid content.
（比較例）
　比較例１として、実施例１と実施例２と同様の耐油紙を用いた。また、比較例２として、薄洋紙（王子製紙株式会社の「ＨＳ２１紙」）に平均厚み８μｍのポリエチレンフィルムをラミネートすることで比較例２の商品用包装シートを得た。 (Comparative example)
As Comparative Example 1, the same oil resistant paper as in Example 1 and Example 2 was used. As Comparative Example 2, a product packaging sheet of Comparative Example 2 was obtained by laminating a polyethylene film having an average thickness of 8 μm to thin paper (“HS21 paper” from Oji Paper Co., Ltd.).
（油の遮蔽性試験）
　実施例１及び２並びに比較例について油の遮蔽性試験を行った。この油の遮蔽性試験は、４０℃の条件下で３ｇのサラダ油を樹脂層に滴下し、裏抜けに要する時間を測定した。なお、実施例１は樹脂層を形成した面にサラダ油を滴下した。 (Oil shielding test)
Examples 1 and 2 and the comparative example were subjected to an oil shielding test. In this oil shielding test, 3 g of salad oil was dropped onto the resin layer under the condition of 40 ° C., and the time required for the back-through was measured. In Example 1, salad oil was dropped on the surface on which the resin layer was formed.
　実施例１及び２では二時間経過しても油が裏抜けしなかった。一方、比較例１は１５分程度経過した際に油抜けが生じた。これから、実施例１及び２は比較例１に比して油の遮蔽性が高いことが判明した。 In Examples 1 and 2, the oil did not break through even after 2 hours. On the other hand, oil loss occurred in Comparative Example 1 after about 15 minutes. From this, it was found that Examples 1 and 2 have higher oil shielding properties than Comparative Example 1.
　また、実施例３及び４について、４０℃の条件下で４ｇのサラダ油を樹脂層に滴下し、裏抜けに要する時間を測定した。実施例３及び４では二時間経過しても油が裏抜けしなかった。つまり、実施例３及び４も比較例１に比して油の遮蔽性が高いことが判明した。 Moreover, about Example 3 and 4, 4 g of salad oil was dripped at the resin layer on 40 degreeC conditions, and the time required for a back-through was measured. In Examples 3 and 4, the oil did not break through even after 2 hours. That is, it was found that Examples 3 and 4 also had higher oil shielding properties than Comparative Example 1.
（透湿度）
　次に、実施例１～４、及び比較例１～２について透湿度試験を行った。この透湿度試験は、カップ法（ＪＩＳＺ０２０８）に準じて行った。 (Moisture permeability)
Next, a moisture permeability test was performed on Examples 1 to 4 and Comparative Examples 1 and 2. This moisture permeability test was performed according to the cup method (JISZ0208).
　実施例１では透湿度が１０６００ｇ／ｍ２２４ｈｒであった。実施例２では透湿度が８５００ｇ／ｍ２２４ｈｒであった。実施例３では透湿度が４３００ｇ／ｍ２２４ｈｒであった。実施例４では透湿度が３５０ｇ／ｍ２２４ｈｒであった。比較例１では透湿度が１３６００ｇ／ｍ２２４ｈｒであった。実施例２では透湿度が９６ｇ／ｍ２２４ｈｒであった。このように実施例１～４は、上記のように油の遮蔽性が高いにも関わらず、透湿度が好適な範囲を奏した。 In Example 1, the water vapor transmission rate was 10600 g / m 2 24 hr. In Example 2, the water vapor transmission rate was 8500 g / m 2 24 hr. In Example 3, the water vapor transmission rate was 4300 g / m 2 24 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 Example 2, the water vapor transmission rate was 96 g / m 2 24 hr. As described above, Examples 1 to 4 exhibited a suitable range of moisture permeability despite the high oil shielding properties as described above.
　実施例１～４及び比較例１～２の食品用包装シートに揚げ物等を含む食品を包装したところ、実施例１～４の食品用包装シートにあっては、外面に油が浸透する現象が生じず、しかも電子レンジで加熱調理した際に食品用包装シートの内面に水滴が付着しなかった。これに対して、比較例１の食品用包装シートにあっては、外面に油が浸透する現象が生じた。また、比較例２の食品用包装シートにあっては、電子レンジで加熱調理した際に商品用包装シートの内面に水滴が付着した。 When food containing fried food or the like is packaged in the food packaging sheets of Examples 1 to 4 and Comparative Examples 1 and 2, the food packaging sheets of Examples 1 to 4 have a phenomenon that oil penetrates into the outer surface. In addition, no water droplets adhered to the inner surface of the food packaging sheet when cooked in a microwave oven. On the other hand, in the food packaging sheet of Comparative Example 1, a phenomenon in which oil penetrated into the outer surface occurred. Moreover, in the food packaging sheet of Comparative Example 2, water droplets adhered to the inner surface of the product packaging sheet when cooked with a microwave oven.
　以上のように、本発明の食品用包装シートは、優れた耐油性を有するので、揚げ物を含む食品を包装するに好適に用いることができる。 As described above, since the food packaging sheet of the present invention has excellent oil resistance, it can be suitably used for packaging food containing fried food.
１　食品用包装シート
２　基層
３　樹脂層
４　印刷部
１０　食品用包装シート
１３　樹脂層 DESCRIPTION OF SYMBOLS 1 Food packaging sheet 2 Base layer 3 Resin layer 4 Printing part 10 Food packaging sheet 13 Resin layer

Claims (7)

  1. 　基層と、
    　この基層の一方の面に積層される樹脂層と
    　を備え、
    　上記樹脂層が、カルボニル基含有樹脂を主成分とする水系エマルジョン又は水系ディスパージョンである塗工液の塗工によって形成されている食品用包装シート。     The base layer,
    A resin layer laminated on one surface of the base layer,
    A food packaging sheet in which the resin layer is formed by application of a coating liquid that is an aqueous emulsion or aqueous dispersion mainly containing a carbonyl group-containing resin.
  2. 　上記基層の他方の面に積層される他の樹脂層をさらに備え、
    　この他の樹脂層が、カルボニル基含有樹脂を主成分とする水系エマルジョン又は水系ディスパージョンである塗工液の塗工によって形成されている請求項１に記載の食品用包装シート。     Further comprising another resin layer laminated on the other surface of the base layer,
    The food packaging sheet according to claim 1, wherein the other resin layer is formed by application of a coating liquid which is an aqueous emulsion or aqueous dispersion mainly containing a carbonyl group-containing resin.
  3. 　上記基層の他方の面側に配設される印刷部をさらに備える請求項１又は請求項２に記載の食品用包装シート。 The food packaging sheet according to claim 1 or 2, further comprising a printing unit disposed on the other surface side of the base layer.
  4. 　上記基層が、フッ素系添加物を含有する耐油紙である請求項１、請求項２又は請求項３に記載の食品用包装シート。 The food packaging sheet according to claim 1, 2 or 3, wherein the base layer is an oil-resistant paper containing a fluorine-based additive.
  5. 　透湿度が２００ｇ／ｍ２２４ｈｒ以上１５０００ｇ／ｍ２２４ｈｒ以下である請求項１から請求項４の何れか１項に記載の食品用包装シート。 5. 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.
  6. 　一方から他方にかけての油の遮蔽性が１時間以上である請求項１から請求項５の何れか１項に記載の食品用包装シート。 6. The food packaging sheet according to any one of claims 1 to 5, wherein the oil shielding property from one to the other is 1 hour or more.
  7. 　カルボニル基含有樹脂を主成分とする水系エマルジョン又は水系ディスパージョンである塗工液を調整する工程、及び
    　この塗工液を基層の一方の面に塗工することで、樹脂層を形成する工程と
    　を備える
    　食品用包装シートの製造方法。     A step of preparing a coating liquid which is an aqueous emulsion or aqueous dispersion mainly composed of a carbonyl group-containing resin, and a step of forming a resin layer by applying this coating liquid to one surface of the base layer; A method for producing a food packaging sheet.
PCT/JP2013/066627 2012-07-06 2013-06-17 Packaging sheet for foods, and method for producing packaging sheet for foods WO2014007054A1 (en)

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