WO2012091022A1 - Fast food packaging material and production method for same - Google Patents

Fast food packaging material and production method for same Download PDF

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Publication number
WO2012091022A1
WO2012091022A1 PCT/JP2011/080234 JP2011080234W WO2012091022A1 WO 2012091022 A1 WO2012091022 A1 WO 2012091022A1 JP 2011080234 W JP2011080234 W JP 2011080234W WO 2012091022 A1 WO2012091022 A1 WO 2012091022A1
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WO
WIPO (PCT)
Prior art keywords
oil
coating layer
base paper
water
layer
Prior art date
Application number
PCT/JP2011/080234
Other languages
French (fr)
Japanese (ja)
Inventor
正人 福島
中野　洋
直樹 谷本
悟 立石
Original Assignee
丸福株式会社
大日精化工業株式会社
株式会社カプリ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 丸福株式会社, 大日精化工業株式会社, 株式会社カプリ filed Critical 丸福株式会社
Priority to JP2012550987A priority Critical patent/JPWO2012091022A1/en
Publication of WO2012091022A1 publication Critical patent/WO2012091022A1/en

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16—Sizing or water-repelling agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B29/00—Layered products comprising a layer of paper or cardboard
    • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/73—Hydrophobic

Definitions

  • the present invention relates to, for example, hamburgers and other fast food packaging materials.
  • So-called hamburger wrapping paper is generally known.
  • a laminate layer is formed of polyethylene resin on the surface of the wrapping paper.
  • the wrapping paper is in direct contact with the hamburger on the side having the laminate layer.
  • the laminating layer keeps the hamburger's moisture and oil inside the wrapping paper. Moisture and oil seepage are prevented.
  • Patent Document 1 discloses an oil-resistant liner paper for cardboard. Two or more oil-resistant resin layers are formed on at least one side of the base paper. Since the corrugated paper is thick, there has been no problem that the water-containing component of the oil resistant resin permeates the corrugated paper and contaminates the impression cylinder of the flexographic printing machine when the oil resistant resin is applied.
  • a fast food packaging material having moisture permeability, breathability, water resistance and oil resistance can be provided.
  • contamination of the impression cylinder of a flexographic printing press can be prevented.
  • the base paper has an oil-resistant coating layer, an ink printing layer, and a water-repellent coating layer laminated on the base paper, and the first surface of the base paper is subjected to aqueous flexographic printing. Only the oil-resistant coating layer is formed, and the water-repellent coating layer and the ink printing layer are sequentially formed by water-based flexographic printing on the second surface on the back side of the first surface of the base paper. Fast food packaging is provided.
  • Such a fast food packaging material is suitably used, for example, for packaging fast food that emits water vapor by causing oil or moisture to flow out.
  • the packaging material for fast food comes into contact with the fast food on the first surface having the oil-resistant coating layer.
  • the oil-resistant coating layer prevents oil from seeping out.
  • the water-repellent coating layer on the second surface on the back side of the first surface, the seepage of moisture from the first surface and the second surface is sufficiently prevented.
  • the oil resistance and water repellency can be ensured without impairing the practical moisture permeability and breathability because the oil resistance function is assigned to the first surface and the decoration and water repellency functions are assigned to the second surface. Was confirmed.
  • the oil-resistant coat layer since only the oil-resistant coat layer is formed on the first surface that comes into contact with the fast food, the oil-resistant coat layer only needs to satisfy food safety standards. Therefore, compared with the case where various materials are laminated
  • a kit value indicating oil resistance of 1 to 8 was realized.
  • an air permeability indicating air permeability of 1000 to 30000 seconds was realized. If the kit value is high, the oil resistance is improved, but the air permeability is lowered.
  • an air permeability of 2500-30000 seconds was obtained.
  • a kit value of 3-4 was realized, an air permeability of 1000-2000 seconds was obtained.
  • a moisture vapor transmission MVTR Moisture Vapor Transmission Rate
  • the oil-resistant coat layer can be formed on the base paper on the back side of the side having the water-repellent coat layer and the ink print layer.
  • the water repellent coating layer is directly formed on one side of the base paper prior to the supply of the water-based flexographic ink, the water-based flexographic ink is operated by the water-repellent coating layer partially dried before printing the ink printing layer. Infiltration of the water-containing component is sufficiently suppressed. As a result, contamination of the impression cylinder of the printing press can be prevented during flexographic printing.
  • the water-repellent coating layer and the ink printing layer may be formed on the base paper on the back side of the side having the oil-resistant coating layer.
  • the oil-resistant coating layer since only the oil-resistant coating layer is formed on one side, a laminated structure of various layers is not formed. Therefore, since there are few moisture components compared with a laminated structure, the penetration of the moisture component of an oil-resistant coating agent does not become a problem with respect to a base paper. As a result, contamination of the impression cylinder can be prevented when the oil-resistant coating agent is applied.
  • the packaging material for fast food may further have a second oil-resistant coating layer sandwiched between the second surface of the base paper and the water-repellent coating layer.
  • a second oil-resistant coating layer sandwiched between the second surface of the base paper and the water-repellent coating layer.
  • an oil-resistant coating layer is provided on each of the first and second surfaces of the base paper, so that the total basis weight necessary to obtain a given oil-resistant effect can be divided into two layers. it can.
  • the basis weight of each oil-resistant coat layer may be smaller than when the oil-resistant coat layer is a single layer.
  • the coating amount of the second oil-resistant coating layer is suppressed.
  • the second oil-resistant coat layer is formed prior to the formation of the oil-resistant coat layer, the water content component during printing of the second oil-resistant coat layer printed directly on the back surface of the base paper is further reduced, Infiltration of the water-containing component of the oil-resistant coating agent into the base paper is suppressed. Contamination of the impression cylinder of the printing press through the base paper can be avoided. Even in this case, as described above, a kit value of 1 to 8, a permeability of 1000 to 30000 seconds, and an MVTR of 300 g / m 2 ⁇ day or more were realized.
  • the fast food packaging material may further include a second water-repellent coating layer that covers the ink print layer.
  • the second water repellent coating layer functions as a protective layer for the ink print layer.
  • the ink print layer is prevented from falling off.
  • the second water-repellent coating layer prevents moisture from entering on the outer surface of the wrapping.
  • Fast food can be protected from moisture from the outside of the package.
  • the base paper can be protected from moisture. As a result, tearing of the fast food packaging material based on moisture can be prevented. Even in this case, as described above, a kit value of 1 to 8, a permeability of 1000 to 30000 seconds, and an MVTR of 300 g / m 2 ⁇ day or more were realized.
  • the base paper has a first oil-resistant coating layer, a second oil-proof coating layer and an ink printing layer laminated on the base paper, and the first surface of the base paper has Only the first oil-resistant coating layer is formed by aqueous flexographic printing, and the second oil-resistant coating layer and the ink printing layer are sequentially formed by water-based flexographic printing on the second surface on the back side of the first surface of the base paper.
  • the second oil-resistant coating layer includes a water repellent component, and a fast food packaging material is provided.
  • the first and second oil-resistant coating layers prevent oil from seeping out from the first side contacting the fast food.
  • the first oil-resistant coating layer On the first side of the base paper, only the first oil-resistant coating layer was used, and the second side of the base paper was also given the oil resistance function, but the second side was given the decoration and water repellent function, It can function similarly to one embodiment of the present invention.
  • the water repellent function on the second surface side is different from the second oil-resistant coat layer. Even in this case, as described above, a kit value of 1 to 8, a permeability of 1000 to 30000 seconds, and an MVTR of 300 g / m 2 ⁇ day or more were realized.
  • the fast food packaging material according to another aspect of the present invention may further include a water-repellent coating layer covering at least one surface of both surfaces of the ink print layer.
  • the additional water-repellent coating layer can enhance the water-repellent function, and can protect the ink printing layer by covering the exposed surface of the ink printing layer.
  • a step of applying an oil-resistant coating agent containing a perfluoropolyether derivative to the first surface of the base paper by water-based flexographic printing, and a step on the back side of the first surface of the base paper comprising a step of applying a water-repellent coating agent containing a wax emulsion on two surfaces by aqueous flexographic printing. According to such a production method, a fast food wrapping paper having water resistance and oil resistance can be easily produced without impairing moisture permeability and air permeability.
  • a base paper a first oil-resistant coating layer formed on the first surface of the base paper by water-based flexographic printing and having a predetermined air permeability
  • the base paper An ink printing layer formed by water-based flexographic printing on the second surface on the back side of the first surface, and the first oil-resistant layer formed by water-based flexographic printing on the second surface of the base paper and having a predetermined air permeability.
  • a fast food wrapping paper comprising the first oil-resistant coating layer and one second oil-resistant coating layer that exhibits a predetermined oil resistance performance in cooperation with the base paper by sandwiching the base paper with a coating layer Is done.
  • the total basis weight required to obtain a given oil resistance effect is 2 by providing the first oil resistance coat layer and the second oil resistance coat layer on the front and back surfaces of the base paper.
  • the basis weight of each oil-resistant coat layer may be smaller than when the oil-resistant coat layer is a single layer. Therefore, the air permeability can be enhanced in the first and second oil resistant coating layers. Since the base paper is sandwiched between the first oil resistant coat layer and the second oil resistant coat layer, the air permeability can be maintained as compared with the case where the first and second oil resistant coat layers are directly stacked.
  • the oil-resistant coating layer reduces the air permeability according to the improvement in oil resistance. If complete oil resistance is ensured by a single oil-resistant coat layer or a laminate of a plurality of oil-resistant coat layers, the air permeability is significantly reduced.
  • the first oil-resistant coating layer adheres to the surface of the base paper and suppresses the permeation of oil.
  • the oil spreads on the surface of the first oil-resistant coating layer. Passes through the first oil-resistant coating layer at a low density. Oil that has passed through the first oil-resistant coating layer diffuses in the base paper. Furthermore, the density of the oil decreases. As a result, the oil is sufficiently blocked by the second oil-resistant coating layer. The oil can be prevented from exuding outside the second oil-resistant coating layer. In this way, the wrapping paper can realize a predetermined oil resistance function while maintaining sufficient air permeability more than before by sandwiching the base paper between the first oil resistance coat layer and the second oil resistance coat layer.
  • the first oil-resistant coat layer and the second oil-resistant coat layer may include an acrylic emulsion and a perfluoropolyether derivative.
  • the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the base paper during printing and contaminating the impression cylinder of the printing press.
  • a fluorine-based compound such as a perfluoropolyether derivative
  • a large amount of coating is required, and the total amount of water-containing components increases when flexographic printing is performed.
  • the acrylic emulsion forms a film on the surface of the base paper and can prevent moisture from penetrating.
  • the base paper can be protected from moisture. Tearing of the base paper due to moisture can be prevented.
  • the perfluoropolyether derivative is applied alone, the ability to prevent moisture permeation decreases, and the water permeates into the base paper. There is concern about tearing of the base paper.
  • the ink print layer may be directly laminated on the second surface of the base paper and covered with the second oil-resistant coating layer. Since the ink of the ink printing layer is printed directly on the base paper, the ink printing layer can be finished with a good appearance. Therefore, higher designability can be realized as compared with the case where the ink is printed on the oil-resistant coating layer.
  • FIG. 1 is a plan view showing a fast food wrapping paper (hereinafter referred to as “wrapping paper”) for a hamburger according to the first embodiment.
  • FIG. 2 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the first embodiment.
  • FIG. 3 is a perspective view schematically showing a use state of the wrapping paper.
  • FIG. 4 is a front view schematically showing the structure of the flexo multicolor printing machine.
  • FIG. 5 is a perspective view schematically showing an operating state of the flexo multicolor printing machine.
  • FIG. 6 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the second embodiment.
  • FIG. 7 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the third embodiment.
  • FIG. 8 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the fourth embodiment.
  • FIG. 9 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the fifth embodiment.
  • FIG. 10 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the sixth embodiment.
  • FIG. 11 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to a comparative example.
  • FIG. 12 is a perspective view schematically showing a wrapping paper processed into a bag shape.
  • FIG. 1 shows a wrapping paper for fast food (hereinafter referred to as “wrapping paper”) 11 for a hamburger according to the first embodiment.
  • the wrapping paper 11 is formed in a rectangular shape, for example.
  • the shape of the wrapping paper 11 may be a square or other quadrangles, or may be other shapes.
  • the wrapping paper 11 is printed with symbols and characters.
  • FIG. 2 schematically shows the laminated structure of the wrapping paper 11.
  • the wrapping paper 11 includes a base paper 12.
  • the base paper 12 thin paper such as high-quality paper, pure white roll paper, bleached kraft paper, and glassine paper is used.
  • the basis weight of the thin paper may be set in the range of 15 to 50 [g / m 2 ].
  • the shape retention of the base paper 12 used for the wrapping paper 11 is not realized, and the flexibility of the base paper 12 is realized, so that paperboard such as cardboard material is positively excluded.
  • a base paper 12 of 18 to 35 [g / m 2 ] is used.
  • the oil-resistant coating layer 13 is formed on the first surface of the base paper 12, that is, the surface 12a.
  • the oil resistant coating layer 13 covers the entire surface 12a of the base paper 12, for example.
  • the oil-resistant coating layer 13 is in direct contact with the surface 12 a of the base paper 12.
  • the OLE_LINK2 oil-resistant coating layer 13 is OLE_LINK2 which may cover the surface 12a of the base paper 12 evenly as long as at least fast food such as a hamburger is directly wrapped.
  • the water repellent coating layer 14 and the ink printing layer 15 are formed in order on the second surface (back side of the first surface) of the base paper 12, that is, the back surface 12b.
  • the water repellent coating layer 14 covers the entire back surface 12 b of the base paper 12.
  • the water repellent coating layer 14 is in direct contact with the back surface 12 b of the base paper 12.
  • An ink printing layer 15 is formed on the surface of the water repellent coating layer 14.
  • the ink printing layer 15 draws a pattern, characters, and a background image.
  • the ink print layer 15 does not necessarily cover the entire surface of the back surface 12b of the base paper 12, and the water-repellent coat layer 14 may be exposed between patterns, characters, and background images.
  • the water-repellent coating layer 14 may cover the back surface 12b of the base paper 12 evenly in a range where at least fast food such as a hamburger is directly wrapped.
  • the coating amount of the water repellent coating layer 14 is 0.1 to 5.0 [g / m 2 ].
  • the coating amount of the water repellent coating layer 14 is set to 0.2 to 3.5 [g / m 2 ].
  • the coating amount of the oil resistant coating layer 13 is 1.0 to 5.0 [g / m 2 ].
  • the coating amount of the oil resistant coating layer 13 is set to 1.5 to 3.5 [g / m 2 ].
  • the coating amount refers to the coating amount after drying. The same shall apply hereinafter.
  • a wrapping paper 11 wraps a hamburger.
  • one wrapping paper 11 is spread on the surface of the cooking table.
  • the surface of the wrapping paper 11, that is, the oil-resistant coating layer 13 is arranged upward.
  • the wrapping paper 11 contacts the surface of the cooking table on the back side.
  • the hamburger 16 is placed on the surface of the wrapping paper 11.
  • the hamburger 16 is wrapped in the wrapping paper 11.
  • the surface of the wrapping paper 11, that is, the oil-resistant coating layer 13 is in direct contact with the hamburger 16.
  • the oil-resistant coating layer 13 prevents oil from leaking out from the hamburger 16.
  • oil does not adhere to a contact object that touches the outer surface of the wrapping paper 11 that wraps the hamburger 16.
  • the water repellent coating layer 14 prevents the leakage of moisture leaking from the hamburger 16.
  • Moisture does not adhere to a contact object that touches the outer surface of the wrapping paper 11 that wraps the hamburger 16.
  • the oil-proof coating layer 13 and the water-repellent coating layer 14 are formed because the front surface 12 a of the base paper 12 has an oil resistance function and the back surface 12 b of the base paper 12 has a decoration and a water-repellent function. Nevertheless, practical moisture permeability and breathability are maintained. Even if steam is generated from the hot hamburger 16, stickiness of the buns of the hamburger 16 can be prevented. If the oil-resistant coating layer on one side has not only the oil-resistant function but also the water-repellent function as before, the thickness of the oil-resistant coating layer will increase to secure sufficient water-repellent function, and the moisture permeability and breathability will be impaired. It will be.
  • this wrapping paper 11 since only the oil-resistant coating layer 13 is formed on the surface 12a in contact with the hamburger 16, the oil-resistant coating layer 13 only needs to satisfy food safety standards. Therefore, compared with the case where various materials are laminated on the surface 12a, the labor of quality control can be remarkably reduced.
  • inspection by a designated inspection organization is required for each material. Even the inspection application procedure alone is bothering.
  • a method for manufacturing the wrapping paper 11 will be briefly described.
  • the flexo multicolor printing machine 21 includes an impression cylinder 22.
  • the impression cylinder 22 includes a cylindrical surface 23.
  • the impression cylinder 22 is disposed so as to be rotatable around a central axis 26 of the cylindrical surface 23 via a support frame 25 installed on the floor surface 24, for example.
  • the central axis 26 of the cylindrical surface 23 may be disposed in parallel to the floor surface 24, for example.
  • the flexo multicolor printing machine 21 includes a plurality of plate cylinders (for example, first to eighth plate cylinders 27a to 27h).
  • the plate cylinders 27a to 27h have a cylindrical surface.
  • the central axis of the cylindrical surface, that is, the drum shaft 29 is arranged in parallel to the central axis 26 of the cylindrical surface 23 of the impression cylinder 22.
  • the plate cylinders 27a to 27h are supported by the support frame 25 so as to be rotatable around the drum shaft 29.
  • the plate cylinders 27a to 27h are in contact with the cylindrical surface 23 of the impression cylinder 22 at one bus bar of the cylindrical surface. Plates may be engraved on the cylindrical surfaces of the plate cylinders 27a to 27h. In this case, the plate cylinders 27a to 27h are in contact with the original fabric on the cylindrical surface 23 of the impression cylinder 22, that is, the paper band.
  • the flexo multicolor printing machine 21 includes an anilox roll 31.
  • the anilox roll 31 has a cylindrical surface.
  • a central axis 32 of the cylindrical surface is arranged in parallel to the drum axis 29 of the plate cylinders 27a to 27h.
  • the anilox roll 31 is supported by the support frame 25 so as to be rotatable about the central axis 32.
  • the anilox roll 31 is in contact with the cylindrical surface 23 of the plate cylinder 22 at one bus bar of the cylindrical surface.
  • a fine cell pattern is engraved on the cylindrical surface of the anilox roll 31.
  • the cylindrical surface of the anilox roll 31 enters the space inside the doctor chamber 33.
  • Ink and a coating agent are supplied to the space in the doctor chamber 33.
  • an ink tank (not shown) may be connected to the doctor chamber 33.
  • Ink and coating agent in the doctor chamber 33 adhere to the cylindrical surface of the anilox roll 31 over the entire area in the axial direction.
  • the ink and the coating agent are held on the anilox roll 31 by the function of the cell pattern.
  • the ink and the coating agent are carried to the plate cylinders 27a to 27h.
  • the ink and the coating agent are transferred from the anilox roll 31 to the plate cylinders 27a to 27h.
  • ink and coating agent are always supplied to the plate cylinders 27a to 27h during the rotation of the plate cylinders 27a to 27h.
  • Ink and coating agent are individually assigned to the plate cylinders 27a to 27h. Depending on the contact of the plate, printing on the original fabric is performed for each ink or coating agent. Since the original fabric is sent to all the plate cylinders 27a to 27h, the overcoating is realized. In this way, a central impression drum (CI) type flexographic printing machine is constructed.
  • an aqueous water repellent coating agent is assigned to the first plate cylinder 27a.
  • Aqueous flexographic ink (for example, white, yellow, cyan, magenta, black) is assigned to the second to sixth plate cylinders 27b to 27f.
  • An aqueous oil-resistant coating agent is assigned to the eighth plate cylinder 27h. Neither ink nor coating agent contains toluene or ethyl acetate. Water and a small amount of alcohol are formulated as a solvent. The color type of the water-based flexographic ink may be appropriately selected and adjusted appropriately.
  • An oil-resistant coating agent is prepared for manufacturing the wrapping paper 11.
  • the oil-resistant coating agent is 40 to 99.8 (excluding) [parts by weight] acrylic emulsion, 0.2 to 50 [parts by weight] perfluoropolyether derivative, and 0 (not including) to 10 [parts by weight].
  • a wax emulsion Preferably, the oil-resistant coating agent is 70 to 99.5 (not including) [parts by weight] acrylic emulsion, 0.5 to 25 [parts by weight] perfluoropolyether derivative and 0 (not including) to 5 [parts by weight]. Part] wax emulsion. In either case, the oil resistant coating agent may not contain a wax emulsion.
  • Perfluoropolyether derivatives are added for the purpose of imparting oil resistance.
  • an acrylic emulsion having oil resistance is used.
  • the acrylic monomer constituting the resin include methacrylic and acrylic monomers.
  • Methacrylic acid includes, for example, methacrylic acid, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, 2- Examples include hydroxyethyl methacrylate, hydroxypropyl methacrylate, lauryl methacrylate, stearyl methacrylate, 4-tert-butylcyclohexyl methacrylate, methacrylamide and the like.
  • acrylics acrylic acid, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, benzyl acrylate, 2-hydroxyethyl Examples include acrylate, hydroxypropyl acrylate, lauryl acrylate, stearyl acrylate, 4-tert-butylcyclohexyl acrylate, acrylamide and the like. Monomers or copolymers of these monomers are used as the resin.
  • a copolymer of a monomer such as methyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate and methacrylic acid having a carboxyl group is used.
  • a copolymer of the exemplified methacryl / acrylic monomer and a vinyl monomer or olefin monomer can also be used.
  • vinyl monomers include styrene, ⁇ -methylstyrene, acrylonitrile, and examples of olefin monomers include ethylene and propylene.
  • perfluoropolyether derivatives examples include phosphate ester derivatives, polyurethane derivatives, and carboxyl derivatives.
  • wax emulsions such as paraffin, carnauba, microcrystalline, low melting point polyethylene, fatty acid ester, fatty acid, petroleum oil, and synthetic resin are used alone (or mixed). .
  • a water-repellent coating agent is prepared for the production of wrapping paper.
  • the water repellent coating agent contains 60 to 99 [parts by weight] of a styrene-acrylic emulsion or acrylic emulsion or a mixture of both and 1 to 40 [parts by weight] of a wax emulsion.
  • the water repellent coating agent comprises 70 to 98 [parts by weight] of a styrene-acrylic emulsion or acrylic emulsion or a mixture of both and 2 to 30 [parts by weight] of a wax emulsion.
  • the wax emulsion is added for the purpose of imparting water repellency.
  • a styrene-acrylic emulsion having excellent water resistance is used.
  • a copolymer resin emulsion of a styrene monomer and the aforementioned methacryl / acrylic monomer is used.
  • the polymerization ratio of the styrene monomer to the methacryl / acrylic monomer is set to 10% by weight to 90% by weight to 50% by weight to 50% by weight.
  • the copolymer resin emulsion may form a copolymer with vinyl monomers such as ⁇ -methylstyrene and acrylonitrile and diene monomers such as butadiene.
  • extender pigments may be added to the oil-resistant coating agent and the water-repellent coating agent as necessary. Breathability and water vapor permeability are imparted based on the addition of extender pigments.
  • extender pigments include calcium bicarbonate, light calcium carbonate, precipitated barium sulfate, fine silica, silica sand, hydrous magnesium silicate, kaolin clay, bentonite, and shirasu balloon.
  • an original fabric that is, a paper band is wound around the cylindrical surface 23 of the impression cylinder 22.
  • the first to sixth plate cylinders 27 a to 27 f are pressed against the impression cylinder 22.
  • a paper strip 35 is fed around the cylindrical surface 23 of the impression cylinder 22 in accordance with the rotation of the impression cylinder 22.
  • the first to sixth plate cylinders 27 a to 27 f rotate in the same rotation direction with respect to the feeding of the paper band 35 around the individual drum shafts 29 in conjunction with the rotation of the impression cylinder 22.
  • a water repellent coating agent is applied to the paper belt 35 from the first plate cylinder 27a.
  • a water repellent coating layer is formed on one side of the paper band 35.
  • the paper band 35 passes through the second to sixth plate cylinders 27b to 27f one after another.
  • Aqueous flexographic ink is supplied to the paper band 35 in order from the second to sixth plate cylinders 27b to 27f.
  • a pattern, characters and background are printed on the surface of the water repellent coating layer.
  • an ink print layer is formed.
  • the back surface of the wrapping paper 11 is finished.
  • the water repellent coating layer is formed directly on one side of the paper band 35 prior to the supply of the water-based flexographic ink, the water-containing component of the water-based flexographic ink is not soaked by the semi-dry water-repellent coating layer. Sufficiently suppressed. As a result, the contamination of the impression cylinder 22 can be prevented by the flexo multicolor printer 21. In particular, even when overprinting is continuously performed in a plurality of times with water-based flexo inks of different colors when forming the ink printing layer, contamination of the impression cylinder 2 of the flexo multicolor printing machine 21 due to the presence of the water-repellent coating layer. Can be prevented. Since the coating amount of the water repellent coating agent is set to 0.1 to 5.0 [g / m 2 ], the water content component of the water repellent coating agent is prevented from penetrating into the paper band 35.
  • the water-based flexographic ink is supplied onto the water repellent coating layer that is still wet on the surface of the paper belt 35. .
  • the water-based flexographic ink can be sufficiently fixed on the surface of the water repellent coating layer.
  • the water-based flexographic ink can be fixed on the surface of the water repellent coating layer upon drying.
  • the paper strip 35 is wound around the cylindrical surface 23 of the impression cylinder 22 again.
  • the paper band 35 is in contact with the cylindrical surface 23 at the surface having the water repellent coating layer.
  • the eighth plate cylinder 27h is in contact with the paper belt 35 on the back surface of the surface having the water repellent coating layer.
  • a paper strip 35 is fed around the cylindrical surface 23 of the impression cylinder 22 in accordance with the rotation of the impression cylinder 22.
  • An oil-resistant coating agent is applied to the paper strip 35 from the eighth plate cylinder 27h. As a result, an oil-resistant coating layer is formed on one side of the paper band 35.
  • the surface of the wrapping paper 11 is finished.
  • the paper band 35 is cut into individual wrapping paper 11.
  • the wrapping paper 11 is manufactured.
  • the water-repellent coating layer and ink printing are applied to the paper band 35 on the back side of the surface having the oil-resistant coating layer.
  • a layer may be formed.
  • the penetration of the water-containing component of the oil-resistant coating agent into the paper band 35 is suppressed.
  • contamination of the impression cylinder 22 can be prevented when the oil resistant coating agent is applied.
  • FIG. 6 schematically shows a laminated structure of the wrapping paper 11a according to the second embodiment.
  • a further water-repellent coating layer 37 that covers the ink printing layer 15 is formed on the back surface 12 b of the base paper 12 with the wrapping paper 11 according to the first embodiment.
  • the water repellent coating layer 37 covers the water repellent coating layer 14 and the ink printing layer 15 over the entire back surface 12 b of the base paper 12.
  • the ink printing layer 15 is sandwiched between the water repellent coating layer 14 and the water repellent coating layer 37.
  • the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 37 is 0.1 to 5.0 [g / m 2 ].
  • the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 37 is set to 0.2 to 3.5 [g / m 2 ].
  • water resistance and oil resistance can be ensured without impairing practical moisture permeability and air permeability.
  • the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the water repellent coating layer 37 functions as a protective layer for the ink printing layer 15.
  • the ink print layer 15 is prevented from falling off.
  • the water repellent coating layer 14 prevents moisture from entering on the outer surface of the wrapping.
  • the hamburger 16 can be protected from moisture from the outside of the package.
  • the base paper 12 can be protected from moisture. As a result, tearing of the wrapping paper 11a based on moisture can be reliably prevented.
  • an oil-resistant coating agent is applied on one side of the paper strip 35.
  • a water repellent coating agent, a water-based flexographic ink, and a water repellent coating agent are sequentially applied and printed. Since the water repellent coating layers 14 and 37 are composed of two layers on the back surface 12b of the base paper 12, the total basis weight necessary for obtaining a given water repellent effect can be divided into two layers. In this case, the basis weight of each of the water repellent coating layers 14 and 37 may be smaller than when the water repellent coating layer is a single layer. The application amount of the water repellent coating layer 14 is suppressed.
  • an oil-resistant coating layer may be first formed on one side of the paper strip 35 in the manufacture of the wrapping paper 11a.
  • FIG. 7 schematically shows a laminated structure of the wrapping paper 11b according to the third embodiment.
  • a further oil-resistant coating layer 38 is sandwiched between the back surface 12 b of the base paper 12 and the water-repellent coating layer 14 in the wrapping paper 11 according to the first embodiment.
  • the coating amount of the oil resistant coating layer 38 is 0.1 to 3.0 [g / m 2 ].
  • the coating amount of the oil resistant coating layer 38 is set to 0.2 to 2.0 [g / m 2 ].
  • the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the total basis weight necessary for obtaining a given oil resistance effect is divided into two layers by providing the oil resistance coat layers 13 and 38 on the front surface 12a and the back surface 12b of the base paper 12, respectively. be able to.
  • the basis weight of each oil-resistant coat layer 13, 38 may be smaller than when the oil-resistant coat layer is a single layer. Therefore, the breathability can be enhanced in the individual oil-resistant coating layers 13 and 38. Since the base paper 12 is sandwiched between the oil-resistant coat layers 13 and 38, the air permeability can be maintained as compared with the case where the oil-resistant coat layers 13 and 38 are directly stacked.
  • the oil-resistant coating layer 13 adheres to the surface 12a of the base paper 12 and suppresses the permeation of oil.
  • the oil spreads on the surface of the oil resistant coating layer 13. It passes through the oil-resistant coating layer 13 at a low density.
  • the oil that has passed through the oil resistant coating layer 13 diffuses in the base paper 12.
  • the density of the oil decreases.
  • Oil can be prevented from exuding outside the oil-resistant coating layer 38.
  • the wrapping paper 11b can achieve a predetermined oil resistance function while maintaining sufficient air permeability than before by sandwiching the base paper 12 between the oil resistance coat layers 13 and 38.
  • the basis weight of each of the oil-resistant coat layers 13 and 38 is smaller than when the oil-resistant coat layer is a single layer, the amount of the oil-resistant coat layer 38 applied on the back surface 12b of the base paper 12 is suppressed.
  • the oil-resistant coat layer 38 is formed prior to the formation of the oil-resistant coat layer 13, the moisture content during printing of the oil-resistant coat layer 38 printed directly on the back surface 12b of the base paper 12 is further reduced, and the paper Infiltration of the water-containing component of the oil-resistant coating agent into the band 35 is suppressed. Contamination of the impression cylinder 22 of the flexo multicolor printing machine 21 through the thin base paper 12 can be avoided.
  • an oil-resistant coating layer may be first formed on one side of the paper strip 35 in the manufacture of the wrapping paper 11b.
  • the oil-resistant coating layers 13 and 38 contain an acrylic emulsion and a perfluoropolyether derivative.
  • the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the paper band 35 during printing and contaminating the impression cylinder 22 of the flexo multicolor printing machine 21.
  • the oil-resistant coating agent contains at least 0.2 [parts by weight] of a perfluoropolyether derivative.
  • the oil-resistant coating agent contains 0.5 [parts by weight] or more of a perfluoropolyether derivative.
  • the acrylic emulsion forms a film on the surface of the base paper 12 and prevents moisture penetration.
  • the base paper 12 can be protected from moisture. Tearing of the base paper 12 based on moisture can be prevented.
  • the oil-resistant coating agent contains at least 40 [parts by weight] of an acrylic emulsion.
  • the oil-resistant coating agent contains 70 [parts by weight] or more of an acrylic emulsion.
  • FIG. 8 schematically shows a laminated structure of the wrapping paper 11c according to the fourth embodiment.
  • a further water repellent coating layer 39 that covers the ink printing layer 15 with the wrapping paper 11b according to the third embodiment is formed.
  • the water repellent coating layer 39 covers, for example, the water repellent coating layer 14 and the ink printing layer 15 over the entire back surface 12 b of the base paper 12.
  • the ink printing layer 15 is sandwiched between the water repellent coating layer 14 and the water repellent coating layer 39.
  • the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 39 is 0.1 to 5.0 [g / m 2 ].
  • the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 39 is set to 0.2 to 3.5 [g / m 2 ].
  • the water repellent coating layer 39 functions as a protective layer for the ink print layer 15.
  • the ink print layer 15 is prevented from falling off.
  • FIG. 9 schematically shows a laminated structure of the wrapping paper 11d according to the fifth embodiment.
  • a further oil-resistant coating layer 41 is sandwiched between the back surface 12b of the base paper 12 and the ink printing layer 15 instead of the water-repellent coating layer 14 in the wrapping paper 11a according to the second embodiment.
  • the coating amount of the oil resistant coating layer 41 is 0.1 to 3.0 [g / m 2 ].
  • the coating amount of the oil resistant coating layer 41 is set to 0.2 to 2.0 [g / m 2 ].
  • Components equivalent to those of the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.
  • an oil-resistant coating agent is applied to one side of the paper strip 35.
  • an oil-resistant coating agent, a water-based flexographic ink, and a water-repellent coating agent are sequentially applied and printed.
  • the oil-resistant coating agent contains 0 (not included) to 5 [parts by weight] of a wax emulsion, that is, a water repellent component. As a result, the oil resistant coat layer 41 exhibits a water repellent function.
  • the oil-resistant coating layer having a water-repellent function is formed on one surface of the paper strip 35 prior to the supply of the water-based flexographic ink, the oil-resistant component of the water-based flexographic ink is sufficiently suppressed by the function of the oil-resistant coating layer. As a result, the contamination of the impression cylinder 22 can be prevented by the flexo multicolor printer 21.
  • the total basis weight necessary to obtain a given oil-resistant effect can be divided into two layers. it can. If it carries out like this, the basic weight of each oil-resistant coat layers 13 and 41 may be smaller than when an oil-resistant coat layer is one layer. Therefore, the air permeability can be enhanced in the individual oil-resistant coat layers 13 and 41. Since the base paper 12 is sandwiched between the oil-resistant coat layers 13 and 41, sufficient air permeability can be ensured as compared with the case where the oil-resistant coat layers 13 and 41 are directly stacked.
  • the oil-resistant coating layer 13 adheres to the surface 12a of the base paper 12 and suppresses the permeation of oil.
  • the oil spreads on the surface of the oil resistant coating layer 13. It passes through the oil-resistant coating layer 13 at a low density.
  • the oil that has passed through the oil resistant coating layer 13 diffuses in the base paper 12.
  • the density of the oil decreases.
  • the oil is sufficiently blocked by the oil resistant coating layer 41. Oil can be prevented from exuding outside the oil-resistant coating layer 41.
  • the wrapping paper 11d can realize a predetermined oil resistance function while maintaining sufficient air permeability more than before by sandwiching the base paper 12 between the oil resistance coat layers 13 and 41.
  • an oil-resistant coating layer may be first formed on one side of the paper strip 35 in the manufacture of the wrapping paper 11d.
  • the oil-resistant coating layers 13 and 41 contain an acrylic emulsion and a perfluoropolyether derivative.
  • the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the paper band 35 during printing and contaminating the impression cylinder 22 of the flexo multicolor printing machine 21.
  • the oil-resistant coating agent contains at least 0.2 [parts by weight] of a perfluoropolyether derivative.
  • the oil-resistant coating agent contains 0.5 [parts by weight] or more of a perfluoropolyether derivative.
  • the acrylic emulsion forms a film on the surface of the base paper 12 and prevents moisture penetration.
  • the base paper 12 can be protected from moisture. Tearing of the base paper 12 based on moisture can be prevented.
  • the oil-resistant coating agent contains at least 40 [parts by weight] of an acrylic emulsion.
  • the oil-resistant coating agent contains 70 [parts by weight] or more of an acrylic emulsion.
  • FIG. 10 schematically shows a laminated structure of the wrapping paper 11e according to the sixth embodiment.
  • a further oil-resistant coat layer (second oil-resistant coat layer) 42 is formed on the back surface 12 b of the base paper 12.
  • the ink print layer 15 is formed between the back surface 12 b of the base paper 12 and the second oil-resistant coating layer 42. That is, the ink print layer 15 is directly formed on the back surface 12 b of the base paper 12. In this way, the ink printing layer 15, that is, the design, characters, and background image are sandwiched between the back surface 12 b of the base paper 12 and the second oil-resistant coating layer 42.
  • the second oil-resistant coating layer 42 covers the entire back surface 12 b of the base paper 12.
  • the second oil-resistant coating layer 42 may evenly cover the back surface 12b of the base paper 12 and the ink printing layer 15 as long as at least a fast food such as a hamburger is directly wrapped.
  • the total coating amount of the first oil-resistant coat layer 13 and the second oil-resistant coat layer 42 is 0.1 to 5.0 [g / m 2 ].
  • the total coating amount of the first oil resistant coat layer 13 and the second oil resistant coat layer 42 is set to 0.2 to 3.5 [g / m 2 ].
  • the second oil resistant coat layer 42 has a predetermined air permeability.
  • the water repellent coating layer is omitted.
  • the first oil resistant coat layer 13 and the second oil resistant coat layer 42 adhere to the base paper 12 and enhance the water resistance of the base paper 12.
  • the same reference numerals are given to configurations equivalent to the configurations of any of the above-described embodiments, and detailed descriptions thereof are omitted.
  • the wrapping paper 11e may be manufactured similarly to the wrapping paper 11 according to the first embodiment. However, the second oil-resistant coating layer 42 is formed on the back surface 12b of the base paper 12 after the ink printing layer 15 is formed.
  • the first oil-resistant coat layer 13 and the second oil-resistant coat layer 42 are provided on the front surface 12a and the back surface 12b of the base paper 12, so that the total basis weight necessary for obtaining a given oil resistance effect is It can be divided into two layers.
  • the basis weight of each of the oil-resistant coat layers 13 and 42 may be smaller than when the oil-resistant coat layer is a single layer. Therefore, the air permeability can be improved in the first and second oil resistant coating layers 13 and 42. Since the base paper 12 is sandwiched between the first oil-resistant coat layer 13 and the second oil-resistant coat layer 42, air permeability is maintained as compared with the case where the first and second oil-resistant coat layers 13 and 42 are directly stacked. Can.
  • the first oil-resistant coating layer 13 adheres to the surface 12a of the base paper 12 and suppresses the permeation of oil.
  • the oil spreads on the surface of the first oil resistant coating layer 13. Passes through the first oil-resistant coating layer 13 at a low density.
  • the oil that has passed through the first oil-resistant coating layer 13 diffuses in the base paper 12.
  • the density of the oil decreases.
  • the oil is sufficiently blocked by the second oil resistant coating layer 42. Oil can be prevented from exuding outside the second oil-resistant coating layer 42.
  • the wrapping paper 11e can realize a predetermined oil resistance function while maintaining sufficient air permeability more than before by sandwiching the base paper 12 between the first oil resistance coat layer 13 and the second oil resistance coat layer.
  • the ink print layer 15 since the ink of the ink print layer 15 is printed directly on the base paper 12, the ink print layer 15 can be finished with a good appearance. Therefore, higher designability can be realized as compared with the case where the ink is printed on the oil-resistant coating layer.
  • the first and second oil resistant coating layers 13 and 42 include an acrylic emulsion and a perfluoropolyether derivative.
  • the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the paper band 35 during printing and contaminating the impression cylinder 22 of the flexo multicolor printing machine 21.
  • the oil-resistant coating agent contains at least 0.2 [parts by weight] of a perfluoropolyether derivative.
  • the oil-resistant coating agent contains 0.5 [parts by weight] or more of a perfluoropolyether derivative.
  • the acrylic emulsion forms a film on the surface of the base paper 12 and prevents moisture penetration.
  • the base paper 12 can be protected from moisture. Tearing of the base paper 12 based on moisture can be prevented.
  • the oil-resistant coating agent contains at least 40 [parts by weight] of an acrylic emulsion.
  • the oil-resistant coating agent contains 70 [parts by weight] or more of an acrylic emulsion.
  • the front surface 12a of the base paper 12 corresponds to a so-called “gloss surface”, and the back surface 12b of the base paper 12 corresponds to a so-called “zara surface”.
  • the “shiny surface” of the base paper 12 is established according to the contact of the mirror roll in the paper making process, for example.
  • a “shiny surface” is formed when the aggregate of pulp contacts the smooth surface of the mirror roll during papermaking.
  • the back side of “Glossy surface” is “Zara surface”.
  • FIG. 11 schematically shows a laminated structure of the wrapping paper 51 according to the comparative example.
  • the ink print layer 15 is formed directly on the back surface 12 b of the base paper 12.
  • the ink print layer 15 is covered with a water repellent coating layer 14.
  • the water repellent coating layer 14 covers the entire back surface 12 b of the base paper 12.
  • the ink print layer 15, that is, the design, characters, and background image are sandwiched between the back surface 12 b of the base paper 12 and the water repellent coating layer 14.
  • the water-repellent coating layer 14 may cover the back surface 12b of the base paper 12 and the ink printing layer 15 evenly in a range where at least fast food such as a hamburger is directly wrapped.
  • the wrapping paper 11, 11a to 11e uses the flexible and thin base paper 12.
  • a water-based flexographic ink, a water-repellent coating agent, and an oil-resistant coating agent are printed on the raw material of the base paper 12, that is, the paper band 35, by water-based flexographic printing.
  • the inventor exudes a water-containing component from the base paper to the opposite side during printing, and contaminates the impression cylinder 22 of the flexo multicolor printing machine 21. I found a problem.
  • the wrapping paper 11, 11a to 11e, 51 may be processed into a bag shape.
  • the two pieces of wrapping paper 11, 11a to 11e, 51 are both formed in a rectangular shape, for example.
  • the wrapping papers 11, 11a to 11e, 51 are connected to each other at two sides.
  • the wrapping papers 11, 11a to 11e, 51 face each other on the surfaces having the oil-resistant coating layer 13. That is, the wrapping paper 11, 11a to 11e, 51 comes into contact with a fast food such as a hamburger with the oil-resistant coating layer 13.
  • a transparent paper piece or a film piece may be bonded to the other piece of wrapping paper 11, 11a to 11e, 51.

Landscapes

  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Paper (AREA)

Abstract

A fast food packaging material wherein: only an oil-resistant coating layer (13) is formed on a first surface (12a) of a base paper (12) by aqueous flexographic printing; and a water-repellant coating layer (14) and an ink printing layer (15) are formed on a second surface (12b) on the rear side of the first surface (12a) of the base paper (12), using aqueous flexographic printing.

Description

ファーストフード用包装材およびその製造方法Fast food packaging material and method for producing the same
　本発明は例えばハンバーガーその他のファーストフード用の包装材等に関する。 The present invention relates to, for example, hamburgers and other fast food packaging materials.
　いわゆるハンバーガー用の包装紙は一般に知られる。この包装紙の表面にはポリエチレン樹脂でラミネート層が形成される。包装紙はラミネート層を有する面でハンバーガーに直接に接触する。ラミネート層の働きでハンバーガーの水分や油は包装紙の内側に閉じ込められる。水分や油の染み出しは防止される。 So-called hamburger wrapping paper is generally known. A laminate layer is formed of polyethylene resin on the surface of the wrapping paper. The wrapping paper is in direct contact with the hamburger on the side having the laminate layer. The laminating layer keeps the hamburger's moisture and oil inside the wrapping paper. Moisture and oil seepage are prevented.
特開２００５－８１６６２号公報JP 2005-81662 A 特開２００４－６８１８０号公報JP 2004-68180 A
　前述のような包装紙ではラミネート層の働きで透湿性や通気性が損なわれる。ハンバーガーから発生する蒸気がラミネート層の表面で結露してしまう。その結果、ハンバーガーのバンズはべたついてしまう。 In the case of the wrapping paper as described above, the moisture permeability and air permeability are impaired by the function of the laminate layer. Steam generated from the hamburger will condense on the surface of the laminate layer. As a result, the hamburger buns become sticky.
　特許文献１は段ボール用の耐油ライナー紙を開示する。原紙の少なくとも片面に２層以上の耐油性樹脂層が形成される。段ボール紙は厚いため、耐油性樹脂の塗工時に耐油性樹脂の含水成分が段ボール紙を透過しフレキソ印刷機の圧胴を汚染するという課題は存在しなかった。 Patent Document 1 discloses an oil-resistant liner paper for cardboard. Two or more oil-resistant resin layers are formed on at least one side of the base paper. Since the corrugated paper is thick, there has been no problem that the water-containing component of the oil resistant resin permeates the corrugated paper and contaminates the impression cylinder of the flexographic printing machine when the oil resistant resin is applied.
　本発明のいくつかの態様によれば、透湿性、通気性、耐水性および耐油性を有するファーストフード用包装材は提供されることができる。なかでも、いくつかの態様によれば、フレキソ印刷機の圧胴の汚染は防止されることができる。 According to some embodiments of the present invention, a fast food packaging material having moisture permeability, breathability, water resistance and oil resistance can be provided. Among other things, according to some aspects, contamination of the impression cylinder of a flexographic printing press can be prevented.
　（１）本発明の一態様によれば、原紙と、前記原紙に積層される耐油コート層、インク印刷層および撥水コート層とを有し、前記原紙の第１面に、水性フレキソ印刷により前記耐油コート層のみが形成され、前記原紙の前記第１面の裏側の第２面に、水性フレキソ印刷により前記撥水コート層および前記インク印刷層が順番に形成されていることを特徴とするファーストフード用包装材が提供される。 (1) According to one aspect of the present invention, the base paper has an oil-resistant coating layer, an ink printing layer, and a water-repellent coating layer laminated on the base paper, and the first surface of the base paper is subjected to aqueous flexographic printing. Only the oil-resistant coating layer is formed, and the water-repellent coating layer and the ink printing layer are sequentially formed by water-based flexographic printing on the second surface on the back side of the first surface of the base paper. Fast food packaging is provided.
　こうしたファーストフード用包装材は、例えば油や水分を流出させ水蒸気を発するファーストフードの包装にあたって好適に用いられる。ファーストフード用包装材は、耐油コート層を有する第１面でファーストフードに接触する。耐油コート層は油の染み出しを防止する。第１面の裏側の第２面に撥水コート層が形成されることで第１面および第２面から水分の染み出しが十分に防止される。しかも、第１面に耐油機能を担わせ、第２面に装飾および撥水機能を担わせたことから、実用的な透湿性および通気性が損なわれずに耐油性および撥水性は確保されることが確認された。さらに、ファーストフードに接触する第１面に耐油コート層のみが形成されることから、耐油コート層で食品包装の安全上の基準が満たされればよい。したがって、様々な材料が第１面に積層される場合に比べて、品質管理の手間は軽減されることができる。 Such a fast food packaging material is suitably used, for example, for packaging fast food that emits water vapor by causing oil or moisture to flow out. The packaging material for fast food comes into contact with the fast food on the first surface having the oil-resistant coating layer. The oil-resistant coating layer prevents oil from seeping out. By forming the water-repellent coating layer on the second surface on the back side of the first surface, the seepage of moisture from the first surface and the second surface is sufficiently prevented. In addition, the oil resistance and water repellency can be ensured without impairing the practical moisture permeability and breathability because the oil resistance function is assigned to the first surface and the decoration and water repellency functions are assigned to the second surface. Was confirmed. Furthermore, since only the oil-resistant coat layer is formed on the first surface that comes into contact with the fast food, the oil-resistant coat layer only needs to satisfy food safety standards. Therefore, compared with the case where various materials are laminated | stacked on the 1st surface, the effort of quality control can be reduced.
　ここで、本態様に係るファーストフード用包装材では、耐油性を示すキット値で１～８の値が実現された。このとき、通気性を示す透気度で１０００～３００００秒が実現された。キット値が高ければ耐油性は向上するものの、通気性は低下する。キット値で７～８の値が実現されると、透気度で２５００～３００００秒が得られた。キット値で３～４の値が実現されると、透気度で１０００～２０００秒が得られた。加えて、本態様に係るファーストフード用包装材では、透湿性を示すＭＶＴＲ（Ｍｏｉｓｔｕｒｅ　Ｖａｐｏｒ　Ｔｒａｎｓｍｉｓｓｉｏｎ　Ｒａｔｅ）で３００ｇ／ｍ２・ｄａｙ以上が実現された。 Here, in the fast food packaging material according to this embodiment, a kit value indicating oil resistance of 1 to 8 was realized. At this time, an air permeability indicating air permeability of 1000 to 30000 seconds was realized. If the kit value is high, the oil resistance is improved, but the air permeability is lowered. When a kit value of 7-8 was realized, an air permeability of 2500-30000 seconds was obtained. When a kit value of 3-4 was realized, an air permeability of 1000-2000 seconds was obtained. In addition, in the fast food packaging material according to this aspect, a moisture vapor transmission MVTR (Moisture Vapor Transmission Rate) of 300 g / m 2 · day or more was realized.
　こうした包装材の製造にあたって、特にファーストフード用包装紙のように、柔軟で薄い原紙の片面に水性フレキソ印刷により各種の層が積層されると、含水成分の総量が増大して、印刷中に水分が原紙から染み出るという課題が発見された。本発明の一態様では、原紙の第１面または第２面のどちらから印刷が実施されても、印刷中に原紙から水分が染み出て印刷機の圧胴を汚染することがない。 In the production of such packaging materials, when various layers are laminated by water-based flexographic printing on one side of a soft, thin base paper, especially for fast food wrapping paper, the total amount of water-containing components increases, and moisture is increased during printing. A problem was discovered that oozes from the base paper. In one aspect of the present invention, even if printing is performed from either the first side or the second side of the base paper, moisture does not ooze out from the base paper during printing and the impression cylinder of the printing press is not contaminated.
　つまり、原紙の片面で撥水コート層およびインク印刷層が形成された後に、これら撥水コート層およびインク印刷層を有する面の裏側の面で原紙に耐油コート層は形成されることができる。この場合、水性フレキソインクの供給に先立って原紙の片面に撥水コート層が直に形成されることから、インク印刷層の印刷前に部分的に乾燥した撥水コート層の働きで水性フレキソインクの含水成分の染み込みは十分に抑制される。その結果、フレキソ印刷にあたって印刷機の圧胴の汚染は防止されることができる。特に、インク印刷層の形成にあたって異なる色の水性フレキソインクで複数回に分けて連続的に重ね刷りが実施されても、撥水コート層の存在により印刷機の圧胴の汚染は防止される。 That is, after the water-repellent coat layer and the ink print layer are formed on one side of the base paper, the oil-resistant coat layer can be formed on the base paper on the back side of the side having the water-repellent coat layer and the ink print layer. In this case, since the water repellent coating layer is directly formed on one side of the base paper prior to the supply of the water-based flexographic ink, the water-based flexographic ink is operated by the water-repellent coating layer partially dried before printing the ink printing layer. Infiltration of the water-containing component is sufficiently suppressed. As a result, contamination of the impression cylinder of the printing press can be prevented during flexographic printing. In particular, even when overprinting is successively performed in a plurality of times with aqueous flexo inks of different colors when forming the ink printing layer, contamination of the impression cylinder of the printing press is prevented by the presence of the water repellent coating layer.
　前述とは反対に、原紙の片面で耐油コート層が形成された後に、耐油コート層を有する面の裏側の面で原紙に撥水コート層およびインク印刷層が形成されてもよい。この場合には、耐油コート層のみが片面に形成されることから、各種の層の積層構造が形成されるわけではない。よって、積層構造と比較して含水成分が少ないため、原紙に対して耐油コート剤の含水成分の染み込みは問題とならない。その結果、耐油コート剤の塗工にあたって圧胴の汚染は防止されることができる。 Contrary to the above, after the oil-resistant coating layer is formed on one side of the base paper, the water-repellent coating layer and the ink printing layer may be formed on the base paper on the back side of the side having the oil-resistant coating layer. In this case, since only the oil-resistant coating layer is formed on one side, a laminated structure of various layers is not formed. Therefore, since there are few moisture components compared with a laminated structure, the penetration of the moisture component of an oil-resistant coating agent does not become a problem with respect to a base paper. As a result, contamination of the impression cylinder can be prevented when the oil-resistant coating agent is applied.
　（２）ファーストフード用包装材は、前記原紙の前記第２面と前記撥水コート層との間に挟み込まれる第２の耐油コート層をさらに有してもよい。このファーストフード用包装材では原紙の第１面および第２面にそれぞれ耐油コート層が設けられることで、所与の耐油効果を得るために必要な総坪量は２層に分割されることができる。こうすると、各耐油コート層の坪量は、耐油コート層が一層であるときよりも小さくて済む。原紙の裏面では第２の耐油コート層の塗布量は抑制される。その結果、耐油コート層の形成に先立って第２の耐油コート層が形成される際に、原紙の裏面に直接に印刷される第２の耐油コート層の印刷時の含水成分はより減少し、原紙に対して耐油コート剤の含水成分の染み込みは抑制される。原紙を通して印刷機の圧胴の汚染は回避されることができる。この場合でも、前述と同様に、１～８のキット値、１０００～３００００秒の透気度および３００ｇ／ｍ２・ｄａｙ以上のＭＶＴＲは実現された。 (2) The packaging material for fast food may further have a second oil-resistant coating layer sandwiched between the second surface of the base paper and the water-repellent coating layer. In this fast food packaging material, an oil-resistant coating layer is provided on each of the first and second surfaces of the base paper, so that the total basis weight necessary to obtain a given oil-resistant effect can be divided into two layers. it can. In this case, the basis weight of each oil-resistant coat layer may be smaller than when the oil-resistant coat layer is a single layer. On the back surface of the base paper, the coating amount of the second oil-resistant coating layer is suppressed. As a result, when the second oil-resistant coat layer is formed prior to the formation of the oil-resistant coat layer, the water content component during printing of the second oil-resistant coat layer printed directly on the back surface of the base paper is further reduced, Infiltration of the water-containing component of the oil-resistant coating agent into the base paper is suppressed. Contamination of the impression cylinder of the printing press through the base paper can be avoided. Even in this case, as described above, a kit value of 1 to 8, a permeability of 1000 to 30000 seconds, and an MVTR of 300 g / m 2 · day or more were realized.
　（３）ファーストフード用包装材は、前記インク印刷層を覆う第２の撥水コート層をさらに有してもよい。第２の撥水コート層はインク印刷層の保護層として機能する。インク印刷層の脱落は防止される。しかも、ファーストフード用包装材がファーストフードを包み込んだ際に、第２の撥水コート層は包みの外面で水分の進入を阻止する。ファーストフードは包みの外側からの水分から保護されることができる。原紙は水分から保護されることができる。その結果、水分に基づくファーストフード包装材の破れは防止されることができる。この場合でも、前述と同様に、１～８のキット値、１０００～３００００秒の透気度および３００ｇ／ｍ２・ｄａｙ以上のＭＶＴＲは実現された。 (3) The fast food packaging material may further include a second water-repellent coating layer that covers the ink print layer. The second water repellent coating layer functions as a protective layer for the ink print layer. The ink print layer is prevented from falling off. Moreover, when the fast food packaging material wraps the fast food, the second water-repellent coating layer prevents moisture from entering on the outer surface of the wrapping. Fast food can be protected from moisture from the outside of the package. The base paper can be protected from moisture. As a result, tearing of the fast food packaging material based on moisture can be prevented. Even in this case, as described above, a kit value of 1 to 8, a permeability of 1000 to 30000 seconds, and an MVTR of 300 g / m 2 · day or more were realized.
　（４）本発明の他の態様によれば、原紙と、前記原紙に積層される第１耐油コート層、第２耐油コート層およびインク印刷層とを有し、前記原紙の第１面に、水性フレキソ印刷により前記第１耐油コート層のみが形成され、前記原紙の前記第１面の裏側の第２面に、水性フレキソ印刷により前記第２耐油コート層および前記インク印刷層が順番に形成され、前記第２耐油コート層は撥水成分を含むことを特徴とするファーストフード用包装材が提供される。 (4) According to another aspect of the present invention, the base paper has a first oil-resistant coating layer, a second oil-proof coating layer and an ink printing layer laminated on the base paper, and the first surface of the base paper has Only the first oil-resistant coating layer is formed by aqueous flexographic printing, and the second oil-resistant coating layer and the ink printing layer are sequentially formed by water-based flexographic printing on the second surface on the back side of the first surface of the base paper. The second oil-resistant coating layer includes a water repellent component, and a fast food packaging material is provided.
　こうしたファーストフード用包装材では、ファーストフードに接触する第１面側からの油の染み出しは、第１および第２耐油コート層により防止される。原紙の第１面には第１耐油コート層のみとした上で、原紙の第２面側にも耐油機能を担わせたが、第２面に装飾および撥水機能を担わせたことから、本発明の一態様と同様に機能させることができる。ただし、第２面側での撥水機能は第２耐油コート層に担わせている点が異なる。この場合でも、前述と同様に、１～８のキット値、１０００～３００００秒の透気度および３００ｇ／ｍ２・ｄａｙ以上のＭＶＴＲは実現された。 In such a fast food packaging material, the first and second oil-resistant coating layers prevent oil from seeping out from the first side contacting the fast food. On the first side of the base paper, only the first oil-resistant coating layer was used, and the second side of the base paper was also given the oil resistance function, but the second side was given the decoration and water repellent function, It can function similarly to one embodiment of the present invention. However, the water repellent function on the second surface side is different from the second oil-resistant coat layer. Even in this case, as described above, a kit value of 1 to 8, a permeability of 1000 to 30000 seconds, and an MVTR of 300 g / m 2 · day or more were realized.
　（５）本発明の他の態様のファーストフード用包装材は、前記インク印刷層の両面の少なくとも一方の面を覆う撥水コート層をさらに有することができる。 (5) The fast food packaging material according to another aspect of the present invention may further include a water-repellent coating layer covering at least one surface of both surfaces of the ink print layer.
　追加の撥水コート層は、撥水機能を高めることができ、インク印刷層の露出面を覆うことでインク印刷層を保護することができる。 The additional water-repellent coating layer can enhance the water-repellent function, and can protect the ink printing layer by covering the exposed surface of the ink printing layer.
　（６）本発明の一態様によれば、原紙の第１面に水性フレキソ印刷によりパーフロオロポリエーテル誘導体を含む耐油コート剤を塗工する工程と、前記原紙の前記第１面の裏側の第２面に水性フレキソ印刷によりワックスエマルジョンを含む撥水コート剤を塗工する工程とを備えるファーストフード用包装紙の製造方法は提供される。こうした製造方法によれば、透湿性および通気性を損なわずに耐水性および耐油性を有するファーストフード用包装紙は簡単に製造されることができる。 (6) According to one aspect of the present invention, a step of applying an oil-resistant coating agent containing a perfluoropolyether derivative to the first surface of the base paper by water-based flexographic printing, and a step on the back side of the first surface of the base paper There is provided a method for producing a fast food wrapping paper comprising a step of applying a water-repellent coating agent containing a wax emulsion on two surfaces by aqueous flexographic printing. According to such a production method, a fast food wrapping paper having water resistance and oil resistance can be easily produced without impairing moisture permeability and air permeability.
　（７）本発明の一態様によれば、原紙と、前記原紙の第１面に水性フレキソ印刷により形成されて、所定の通気性を有する１層の第１耐油コート層と、前記原紙の前記第１面の裏側の第２面に水性フレキソ印刷により形成されるインク印刷層と、前記原紙の前記第２面に水性フレキソ印刷により形成されて、所定の通気性を有しつつ前記第１耐油コート層との間に前記原紙を挟み込むことで前記第１耐油コート層および前記原紙と協働で所定の耐油性能を発揮する１層の第２耐油コート層とを備えるファーストフード用包装紙が提供される。 (7) According to one aspect of the present invention, a base paper, a first oil-resistant coating layer formed on the first surface of the base paper by water-based flexographic printing and having a predetermined air permeability, and the base paper An ink printing layer formed by water-based flexographic printing on the second surface on the back side of the first surface, and the first oil-resistant layer formed by water-based flexographic printing on the second surface of the base paper and having a predetermined air permeability. Provided is a fast food wrapping paper comprising the first oil-resistant coating layer and one second oil-resistant coating layer that exhibits a predetermined oil resistance performance in cooperation with the base paper by sandwiching the base paper with a coating layer Is done.
　本態様に係るファーストフード用包装紙では、原紙の表面および裏面に第１耐油コート層および第２耐油コート層が設けられることで、所与の耐油効果を得るために必要な総坪量は２層に分割されることができる。こうすると、各耐油コート層の坪量は、耐油コート層が一層であるときよりも小さくて済む。したがって、第１および第２耐油コート層では通気性は高められることができる。第１耐油コート層および第２耐油コート層の間に原紙が挟まれることから、第１および第２耐油コート層同士が直接に重ねられる場合に比べて通気性は維持されることができる。一般に、耐油コート層は耐油性の向上に応じて通気性を低下させる。単独の耐油コート層や複数の耐油コート層の積層体で完全な耐油性が確保されると、通気性は著しく低下してしまう。 In the wrapping paper for fast food according to this aspect, the total basis weight required to obtain a given oil resistance effect is 2 by providing the first oil resistance coat layer and the second oil resistance coat layer on the front and back surfaces of the base paper. Can be divided into layers. In this case, the basis weight of each oil-resistant coat layer may be smaller than when the oil-resistant coat layer is a single layer. Therefore, the air permeability can be enhanced in the first and second oil resistant coating layers. Since the base paper is sandwiched between the first oil resistant coat layer and the second oil resistant coat layer, the air permeability can be maintained as compared with the case where the first and second oil resistant coat layers are directly stacked. In general, the oil-resistant coating layer reduces the air permeability according to the improvement in oil resistance. If complete oil resistance is ensured by a single oil-resistant coat layer or a laminate of a plurality of oil-resistant coat layers, the air permeability is significantly reduced.
　しかも、第１耐油コート層は原紙の表面に付着し油の染み込みを抑制する。油は第１耐油コート層の表面で広がる。低い密度で第１耐油コート層を通過する。第１耐油コート層を通過した油は原紙内で拡散する。さらに油の密度は低下する。その結果、第２耐油コート層で十分に油は堰き止められる。第２耐油コート層の外側では油の染み出しは防止されることができる。こうして包装紙は、第１耐油コート層および第２耐油コート層で原紙を挟み込むことで、これまで以上に十分な通気性を維持しつつ所定の耐油機能を実現することができる。 Moreover, the first oil-resistant coating layer adheres to the surface of the base paper and suppresses the permeation of oil. The oil spreads on the surface of the first oil-resistant coating layer. Passes through the first oil-resistant coating layer at a low density. Oil that has passed through the first oil-resistant coating layer diffuses in the base paper. Furthermore, the density of the oil decreases. As a result, the oil is sufficiently blocked by the second oil-resistant coating layer. The oil can be prevented from exuding outside the second oil-resistant coating layer. In this way, the wrapping paper can realize a predetermined oil resistance function while maintaining sufficient air permeability more than before by sandwiching the base paper between the first oil resistance coat layer and the second oil resistance coat layer.
　（８）前記第１耐油コート層および前記第２耐油コート層はアクリル系エマルジョンおよびパーフロオロポリエーテル誘導体を含むことができる。こうしてパーフロオロポリエーテル誘導体が混合されると、撥油性が高まり、アクリル系エマルジョンの減量が実現される。すなわち、パーフロオロポリエーテル誘導体が混ぜ合わせられない場合に比べて、アクリル系エマルジョンの塗布量は抑えられることができる。その結果、フレキソ印刷の実施にあたって含水成分の総量は減少する。印刷中に原紙から水分が染み出て印刷機の圧胴を汚染することは防止されることができる。パーフロオロポリエーテル誘導体といったフッ素系化合物が併用されないと、多くの塗布量が必要とされ、フレキソ印刷の実施にあたって含水成分の総量は増加してしまう。印刷中に原紙から水分が染み出て印刷機の圧胴を汚染してしまう。アクリル系エマルジョンは原紙の表面に膜を形成し、水分の染み込みを防止することができる。原紙は水分から保護されることができる。水分に基づく原紙の破れは防止されることができる。パーフロオロポリエーテル誘導体が単独で塗布されると、水分の染み込みを防止する能力が低下し、水分は原紙に染み込む。原紙の破れが懸念される。 (8) The first oil-resistant coat layer and the second oil-resistant coat layer may include an acrylic emulsion and a perfluoropolyether derivative. When the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the base paper during printing and contaminating the impression cylinder of the printing press. If a fluorine-based compound such as a perfluoropolyether derivative is not used in combination, a large amount of coating is required, and the total amount of water-containing components increases when flexographic printing is performed. Moisture oozes from the base paper during printing and contaminates the impression cylinder of the printing press. The acrylic emulsion forms a film on the surface of the base paper and can prevent moisture from penetrating. The base paper can be protected from moisture. Tearing of the base paper due to moisture can be prevented. When the perfluoropolyether derivative is applied alone, the ability to prevent moisture permeation decreases, and the water permeates into the base paper. There is concern about tearing of the base paper.
　（９）前記インク印刷層は、前記原紙の前記第２面に直接に積層され、前記第２耐油コート層で覆われることができる。インク印刷層のインクは直接に原紙に印刷されることから、インク印刷層は見栄えよく仕上げられることができる。したがって、インクが耐油コート層に印刷される場合に比べて、高い意匠性が実現されることができる。 (9) The ink print layer may be directly laminated on the second surface of the base paper and covered with the second oil-resistant coating layer. Since the ink of the ink printing layer is printed directly on the base paper, the ink printing layer can be finished with a good appearance. Therefore, higher designability can be realized as compared with the case where the ink is printed on the oil-resistant coating layer.
図１は、第１実施形態に係るハンバーガー向けのファーストフード用包装紙（以下「包装紙」という）を示す平面図である。FIG. 1 is a plan view showing a fast food wrapping paper (hereinafter referred to as “wrapping paper”) for a hamburger according to the first embodiment. 図２は、第１実施形態に係る包装紙の積層構造を概略的に示す拡大断面図である。FIG. 2 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the first embodiment. 図３は、包装紙の使用状態を概略的に示す斜視図である。FIG. 3 is a perspective view schematically showing a use state of the wrapping paper. 図４は、フレキソ多色印刷機の構造を概略的に示す正面図である。FIG. 4 is a front view schematically showing the structure of the flexo multicolor printing machine. 図５は、フレキソ多色印刷機の作動状態を概略的に示す斜視図である。FIG. 5 is a perspective view schematically showing an operating state of the flexo multicolor printing machine. 図６は、第２実施形態に係る包装紙の積層構造を概略的に示す拡大断面図である。FIG. 6 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the second embodiment. 図７は、第３実施形態に係る包装紙の積層構造を概略的に示す拡大断面図である。FIG. 7 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the third embodiment. 図８は、第４実施形態に係る包装紙の積層構造を概略的に示す拡大断面図である。FIG. 8 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the fourth embodiment. 図９は、第５実施形態に係る包装紙の積層構造を概略的に示す拡大断面図である。FIG. 9 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the fifth embodiment. 図１０は、第６実施形態に係る包装紙の積層構造を概略的に示す拡大断面図である。FIG. 10 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to the sixth embodiment. 図１１は、比較例に係る包装紙の積層構造を概略的に示す拡大断面図である。FIG. 11 is an enlarged cross-sectional view schematically showing a laminated structure of wrapping paper according to a comparative example. 図１２は、袋状に加工された包装紙を概略的に示す斜視図である。FIG. 12 is a perspective view schematically showing a wrapping paper processed into a bag shape.
　以下、添付図面を参照しつつ本発明の一実施形態を説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.
　図１は第１実施形態に係るハンバーガー向けのファーストフード用包装紙（以下「包装紙」という）１１を示す。包装紙１１は例えば長方形に形作られる。その他、包装紙１１の形状は正方形その他の四角形であってもよくそれら以外の形状であってもよい。包装紙１１には図柄や文字などの印刷が施される。 FIG. 1 shows a wrapping paper for fast food (hereinafter referred to as “wrapping paper”) 11 for a hamburger according to the first embodiment. The wrapping paper 11 is formed in a rectangular shape, for example. In addition, the shape of the wrapping paper 11 may be a square or other quadrangles, or may be other shapes. The wrapping paper 11 is printed with symbols and characters.
　図２は包装紙１１の積層構造を概略的に示す。包装紙１１は原紙１２を備える。原紙１２には上質紙、純白ロール紙、さらしクラフト紙およびグラシン紙などの薄紙が用いられる。薄紙の坪量は１５～５０［ｇ／ｍ２］の範囲で設定されればよい。この場合、包装紙１１に用いられる原紙１２の保形性は実現されず原紙１２の柔軟性が実現されることから、段ボール材などの板紙は積極的に排除される。好ましくは、１８～３５［ｇ／ｍ２］の原紙１２が用いられる。 FIG. 2 schematically shows the laminated structure of the wrapping paper 11. The wrapping paper 11 includes a base paper 12. As the base paper 12, thin paper such as high-quality paper, pure white roll paper, bleached kraft paper, and glassine paper is used. The basis weight of the thin paper may be set in the range of 15 to 50 [g / m 2 ]. In this case, the shape retention of the base paper 12 used for the wrapping paper 11 is not realized, and the flexibility of the base paper 12 is realized, so that paperboard such as cardboard material is positively excluded. Preferably, a base paper 12 of 18 to 35 [g / m 2 ] is used.
　原紙１２の第１面すなわち表面１２ａには耐油コート層１３が形成される。耐油コート層１３は例えば原紙１２の表面１２ａ全域を覆う。耐油コート層１３は原紙１２の表面１２ａに直接に接触する。ただし、OLE_LINK2耐油コート層１３は、少なくともハンバーガーといったファーストフードを直接に包み込む範囲で満遍なく原紙１２の表面１２ａを覆えばよいOLE_LINK2。 The oil-resistant coating layer 13 is formed on the first surface of the base paper 12, that is, the surface 12a. The oil resistant coating layer 13 covers the entire surface 12a of the base paper 12, for example. The oil-resistant coating layer 13 is in direct contact with the surface 12 a of the base paper 12. However, the OLE_LINK2 oil-resistant coating layer 13 is OLE_LINK2 which may cover the surface 12a of the base paper 12 evenly as long as at least fast food such as a hamburger is directly wrapped.
　原紙１２の第２面（第１面の裏側）すなわち裏面１２ｂには撥水コート層１４およびインク印刷層１５が順番に形成される。撥水コート層１４は原紙１２の裏面１２ｂ全域を覆う。撥水コート層１４は原紙１２の裏面１２ｂに直接に接触する。撥水コート層１４の表面にインク印刷層１５が形成される。インク印刷層１５は図柄や文字、背景像を描き出す。インク印刷層１５は必ずしも原紙１２の裏面１２ｂ全域で撥水コート層１４を覆うわけではなく図柄や文字、背景像の合間で撥水コート層１４が露出することもある。撥水コート層１４は、少なくともハンバーガーといったファーストフードを直接に包み込む範囲で満遍なく原紙１２の裏面１２ｂを覆えばよい。 The water repellent coating layer 14 and the ink printing layer 15 are formed in order on the second surface (back side of the first surface) of the base paper 12, that is, the back surface 12b. The water repellent coating layer 14 covers the entire back surface 12 b of the base paper 12. The water repellent coating layer 14 is in direct contact with the back surface 12 b of the base paper 12. An ink printing layer 15 is formed on the surface of the water repellent coating layer 14. The ink printing layer 15 draws a pattern, characters, and a background image. The ink print layer 15 does not necessarily cover the entire surface of the back surface 12b of the base paper 12, and the water-repellent coat layer 14 may be exposed between patterns, characters, and background images. The water-repellent coating layer 14 may cover the back surface 12b of the base paper 12 evenly in a range where at least fast food such as a hamburger is directly wrapped.
　この包装紙１１では撥水コート層１４の塗布量は０．１～５．０［ｇ／ｍ２］である。好ましくは、撥水コート層１４の塗布量は０．２～３．５［ｇ／ｍ２］に設定される。耐油コート層１３の塗布量は１．０～５．０［ｇ／ｍ２］である。好ましくは、耐油コート層１３の塗布量は１．５～３．５［ｇ／ｍ２］に設定される。ここで、塗布量は乾燥後の塗布量をいう。以下、同様とする。 In this wrapping paper 11, the coating amount of the water repellent coating layer 14 is 0.1 to 5.0 [g / m 2 ]. Preferably, the coating amount of the water repellent coating layer 14 is set to 0.2 to 3.5 [g / m 2 ]. The coating amount of the oil resistant coating layer 13 is 1.0 to 5.0 [g / m 2 ]. Preferably, the coating amount of the oil resistant coating layer 13 is set to 1.5 to 3.5 [g / m 2 ]. Here, the coating amount refers to the coating amount after drying. The same shall apply hereinafter.
　いま、包装紙１１でハンバーガーを包み込む場面を想定する。例えば１枚の包装紙１１は調理台の表面に広げられる。包装紙１１の表面すなわち耐油コート層１３は上向きに配置される。包装紙１１は裏面で調理台の表面に接触する。 Now, suppose a wrapping paper 11 wraps a hamburger. For example, one wrapping paper 11 is spread on the surface of the cooking table. The surface of the wrapping paper 11, that is, the oil-resistant coating layer 13 is arranged upward. The wrapping paper 11 contacts the surface of the cooking table on the back side.
　図３に示されるように、包装紙１１の表面にハンバーガー１６は置かれる。ハンバーガー１６は包装紙１１で包み込まれる。包装紙１１の表面すなわち耐油コート層１３はハンバーガー１６に直接に接触する。耐油コート層１３の働きでハンバーガー１６から漏れ出る油の染み出しは防止される。その結果、ハンバーガー１６を包み込んだ包装紙１１の外面に触れる接触物に油は付着しない。同時に、撥水コート層１４の働きでハンバーガー１６から漏れ出る水分の染み出しは防止される。ハンバーガー１６を包み込んだ包装紙１１の外面に触れる接触物に水分は付着しない。 As shown in FIG. 3, the hamburger 16 is placed on the surface of the wrapping paper 11. The hamburger 16 is wrapped in the wrapping paper 11. The surface of the wrapping paper 11, that is, the oil-resistant coating layer 13 is in direct contact with the hamburger 16. The oil-resistant coating layer 13 prevents oil from leaking out from the hamburger 16. As a result, oil does not adhere to a contact object that touches the outer surface of the wrapping paper 11 that wraps the hamburger 16. At the same time, the water repellent coating layer 14 prevents the leakage of moisture leaking from the hamburger 16. Moisture does not adhere to a contact object that touches the outer surface of the wrapping paper 11 that wraps the hamburger 16.
　しかも、この包装紙１１では、原紙１２の表面１２ａに耐油機能を担わせ、原紙１２の裏面１２ｂに装飾および撥水機能を担わせたことから、耐油コート層１３および撥水コート層１４の形成にも拘わらず実用的な透湿性および通気性が維持される。熱いハンバーガー１６から蒸気が発生しても、ハンバーガー１６のバンズのべたつきは防止されることができる。従来のように片面の耐油コート層に耐油機能のみならず撥水機能をも担わせてしまうと、十分な撥水機能の確保にあたって耐油コート層の厚みが増大し、透湿性および通気性は損なわれてしまう。 Moreover, in this wrapping paper 11, the oil-proof coating layer 13 and the water-repellent coating layer 14 are formed because the front surface 12 a of the base paper 12 has an oil resistance function and the back surface 12 b of the base paper 12 has a decoration and a water-repellent function. Nevertheless, practical moisture permeability and breathability are maintained. Even if steam is generated from the hot hamburger 16, stickiness of the buns of the hamburger 16 can be prevented. If the oil-resistant coating layer on one side has not only the oil-resistant function but also the water-repellent function as before, the thickness of the oil-resistant coating layer will increase to secure sufficient water-repellent function, and the moisture permeability and breathability will be impaired. It will be.
　さらに、この包装紙１１では、ハンバーガー１６に接触する表面１２ａに耐油コート層１３のみが形成されることから、耐油コート層１３で食品包装の安全上の基準が満たされればよい。したがって、様々な材料が表面１２ａに積層される場合に比べて、品質管理の手間は著しく軽減されることができる。様々な材料が表面１２ａに積層されると、材料ごとに指定の検査機関の検査が要求されてしまう。検査の申請手続きだけでも煩わされる。 Furthermore, in this wrapping paper 11, since only the oil-resistant coating layer 13 is formed on the surface 12a in contact with the hamburger 16, the oil-resistant coating layer 13 only needs to satisfy food safety standards. Therefore, compared with the case where various materials are laminated on the surface 12a, the labor of quality control can be remarkably reduced. When various materials are laminated on the surface 12a, inspection by a designated inspection organization is required for each material. Even the inspection application procedure alone is bothering.
　次に、包装紙１１の製造方法を簡単に説明する。包装紙１１の製造にあたって、例えば図４に示されるように、フレキソ多色印刷機２１が利用される。フレキソ多色印刷機２１は圧胴２２を備える。圧胴２２は円筒面２３を備える。圧胴２２は例えば床面２４に設置される支持フレーム２５を介して円筒面２３の中心軸２６回りで回転自在に配置される。円筒面２３の中心軸２６は例えば床面２４に平行に配置されればよい。 Next, a method for manufacturing the wrapping paper 11 will be briefly described. In manufacturing the wrapping paper 11, for example, as shown in FIG. 4, a flexo multicolor printer 21 is used. The flexo multicolor printing machine 21 includes an impression cylinder 22. The impression cylinder 22 includes a cylindrical surface 23. The impression cylinder 22 is disposed so as to be rotatable around a central axis 26 of the cylindrical surface 23 via a support frame 25 installed on the floor surface 24, for example. The central axis 26 of the cylindrical surface 23 may be disposed in parallel to the floor surface 24, for example.
　フレキソ多色印刷機２１は複数の版胴（例えば第１～第８版胴２７ａ～２７ｈ）を備える。版胴２７ａ～２７ｈは円筒面を備える。円筒面の中心軸すなわちドラム軸２９は圧胴２２の円筒面２３の中心軸２６に平行に配置される。版胴２７ａ～２７ｈは支持フレーム２５にドラム軸２９回りで回転自在に支持される。版胴２７ａ～２７ｈは円筒面の１母線で圧胴２２の円筒面２３に接触する。版胴２７ａ～２７ｈの円筒面には版が刻まれてもよい。この場合には、版胴２７ａ～２７ｈは圧胴２２の円筒面２３上の原反すなわち紙帯に版で接触する。 The flexo multicolor printing machine 21 includes a plurality of plate cylinders (for example, first to eighth plate cylinders 27a to 27h). The plate cylinders 27a to 27h have a cylindrical surface. The central axis of the cylindrical surface, that is, the drum shaft 29 is arranged in parallel to the central axis 26 of the cylindrical surface 23 of the impression cylinder 22. The plate cylinders 27a to 27h are supported by the support frame 25 so as to be rotatable around the drum shaft 29. The plate cylinders 27a to 27h are in contact with the cylindrical surface 23 of the impression cylinder 22 at one bus bar of the cylindrical surface. Plates may be engraved on the cylindrical surfaces of the plate cylinders 27a to 27h. In this case, the plate cylinders 27a to 27h are in contact with the original fabric on the cylindrical surface 23 of the impression cylinder 22, that is, the paper band.
　フレキソ多色印刷機２１はアニロックスロール３１を備える。アニロックスロール３１は円筒面を備える。円筒面の中心軸３２は版胴２７ａ～２７ｈのドラム軸２９に平行に配置される。アニロックスロール３１は支持フレーム２５に中心軸３２回りで回転自在に支持される。アニロックスロール３１は円筒面の１母線で版胴２２の円筒面２３に接触する。アニロックスロール３１の円筒面には微細なセル模様が刻まれる。 The flexo multicolor printing machine 21 includes an anilox roll 31. The anilox roll 31 has a cylindrical surface. A central axis 32 of the cylindrical surface is arranged in parallel to the drum axis 29 of the plate cylinders 27a to 27h. The anilox roll 31 is supported by the support frame 25 so as to be rotatable about the central axis 32. The anilox roll 31 is in contact with the cylindrical surface 23 of the plate cylinder 22 at one bus bar of the cylindrical surface. A fine cell pattern is engraved on the cylindrical surface of the anilox roll 31.
　アニロックスロール３１の円筒面はドクターチャンバー３３内の空間に進入する。ドクターチャンバー３３内の空間にはインクやコート剤が供給される。供給にあたって例えばドクターチャンバー３３にはインクタンク（図示されず）が接続されればよい。アニロックスロール３１の円筒面には軸方向に全域にわたってドクターチャンバー３３内のインクやコート剤が付着する。セル模様の働きでインクやコート剤はアニロックスロール３１上に保持される。アニロックスロール３１の回転に応じてインクやコート剤は版胴２７ａ～２７ｈまで運ばれる。インクやコート剤はアニロックスロール３１から版胴２７ａ～２７ｈに移される。こうして版胴２７ａ～２７ｈの回転中に版胴２７ａ～２７ｈには常にインクやコート剤が供給される。 The cylindrical surface of the anilox roll 31 enters the space inside the doctor chamber 33. Ink and a coating agent are supplied to the space in the doctor chamber 33. For supply, for example, an ink tank (not shown) may be connected to the doctor chamber 33. Ink and coating agent in the doctor chamber 33 adhere to the cylindrical surface of the anilox roll 31 over the entire area in the axial direction. The ink and the coating agent are held on the anilox roll 31 by the function of the cell pattern. In accordance with the rotation of the anilox roll 31, the ink and the coating agent are carried to the plate cylinders 27a to 27h. The ink and the coating agent are transferred from the anilox roll 31 to the plate cylinders 27a to 27h. Thus, ink and coating agent are always supplied to the plate cylinders 27a to 27h during the rotation of the plate cylinders 27a to 27h.
　版胴２７ａ～２７ｈには個別にインクやコート剤が割り当てられる。版の接触に応じてインクやコート剤ごとに原反への印刷が実施される。全ての版胴２７ａ～２７ｈに共通に原反が送られることから、重ね塗りが実現される。こうしてセントラルインプレッションドラム（ＣＩ）型フレキソ印刷機が構築される。本実施形態では、例えば第１版胴２７ａに水性の撥水コート剤が割り当てられる。第２～第６版胴２７ｂ～２７ｆに水性フレキソインク（例えば白色、イエロー、シアン、マゼンタ、黒色）が割り当てられる。第８版胴２７ｈには水性の耐油コート剤が割り当てられる。いずれのインクやコート剤にもトルエンや酢酸エチルは含まれない。溶媒として水および少量のアルコールが調合される。水性フレキソインクの色の種類は適宜に選択され適宜に調整されればよい。 Ink and coating agent are individually assigned to the plate cylinders 27a to 27h. Depending on the contact of the plate, printing on the original fabric is performed for each ink or coating agent. Since the original fabric is sent to all the plate cylinders 27a to 27h, the overcoating is realized. In this way, a central impression drum (CI) type flexographic printing machine is constructed. In the present embodiment, for example, an aqueous water repellent coating agent is assigned to the first plate cylinder 27a. Aqueous flexographic ink (for example, white, yellow, cyan, magenta, black) is assigned to the second to sixth plate cylinders 27b to 27f. An aqueous oil-resistant coating agent is assigned to the eighth plate cylinder 27h. Neither ink nor coating agent contains toluene or ethyl acetate. Water and a small amount of alcohol are formulated as a solvent. The color type of the water-based flexographic ink may be appropriately selected and adjusted appropriately.
　包装紙１１の製造にあたって耐油コート剤が用意される。耐油コート剤は４０～９９．８（含まない）［重量部］のアクリル系エマルジョンと０．２～５０［重量部］のパーフロオロポリエーテル誘導体と０（含まない）～１０［重量部］のワックスエマルジョンとを含む。好ましくは、耐油コート剤は７０～９９．５（含まない）［重量部］のアクリル系エマルジョンと０．５～２５［重量部］のパーフロオロポリエーテル誘導体と０（含まない）～５［重量部］のワックスエマルジョンとを含む。いずれの場合でも耐油コート剤はワックスエマルジョンを含まなくてもよい。パーフロオロポリエーテル誘導体は耐油性の付与を目的に添加される。 An oil-resistant coating agent is prepared for manufacturing the wrapping paper 11. The oil-resistant coating agent is 40 to 99.8 (excluding) [parts by weight] acrylic emulsion, 0.2 to 50 [parts by weight] perfluoropolyether derivative, and 0 (not including) to 10 [parts by weight]. A wax emulsion. Preferably, the oil-resistant coating agent is 70 to 99.5 (not including) [parts by weight] acrylic emulsion, 0.5 to 25 [parts by weight] perfluoropolyether derivative and 0 (not including) to 5 [parts by weight]. Part] wax emulsion. In either case, the oil resistant coating agent may not contain a wax emulsion. Perfluoropolyether derivatives are added for the purpose of imparting oil resistance.
　好ましくは、アクリル系エマルジョンには耐油性のあるものが使用される。樹脂を構成するアクリル系モノマーとしてはメタクリル系やアクリル系などが挙げられる。メタクリル系には、例えば、メタクリル酸、メチルメタクリレート、エチルメタクリレート、ｎ－プロピルメタクリレート、イソプロピルメタクリレート、ｎ－ブチルメタクリレート、イソブチルメタクリレート、ｔｅｒｔ－ブチルメタクリレート、２－エチルヘキシルメタクリレート、シクロヘキシルメタクリレート、ベンジルメタクリレート、２－ヒドロキシエチルメタクリレート、ヒドロキシプロピルメタクリレート、ラウリルメタクリレート、ステアリルメタクリレート、４－ｔｅｒｔ－ブチルシクロヘキシルメタクリレート、メタクリルアミドなどが含まれる。アクリル系には、アクリル酸、メチルアクリレート、エチルアクリレート、ｎ－プロピルアクリレート、イソプロピルアクリレート、ｎ－ブチルアクリレート、イソブチルアクリレート、ｔｅｒｔ－ブチルアクリレート、２－エチルヘキシルアクリレート、シクロヘキシルアクリレート、ベンジルアクリレート、２－ヒドロキシエチルアクリレート、ヒドロキシプロピルアクリレート、ラウリルアクリレート、ステアリルアクリレート、４－ｔｅｒｔ－ブチルシクロヘキシルアクリレート、アクリルアミドなどが含まれる。これらモノマーの単量体または共重合体が樹脂として使用される。好ましくは、メチルメタクリレート、エチルメタクリレート、２－エチルヘキシルメタクリレートなどのモノマーと、カルボキシル基を有するメタクリル酸との共重合体が用いられる。ただし、特にこれに限られるものではない。その他、例示のメタクリル・アクリル系モノマーと、ビニルモノマーやオレフィンモノマーとの共重合体も使用されることができる。ビニルモノマーにはスチレンやα－メチルスチレン、アクリロニトリルなどが挙げられ、オレフィンモノマーにはエチレンやプロピレンなどが挙げられる。 Preferably, an acrylic emulsion having oil resistance is used. Examples of the acrylic monomer constituting the resin include methacrylic and acrylic monomers. Methacrylic acid includes, for example, methacrylic acid, methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, tert-butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, 2- Examples include hydroxyethyl methacrylate, hydroxypropyl methacrylate, lauryl methacrylate, stearyl methacrylate, 4-tert-butylcyclohexyl methacrylate, methacrylamide and the like. For acrylics, acrylic acid, methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate, tert-butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, benzyl acrylate, 2-hydroxyethyl Examples include acrylate, hydroxypropyl acrylate, lauryl acrylate, stearyl acrylate, 4-tert-butylcyclohexyl acrylate, acrylamide and the like. Monomers or copolymers of these monomers are used as the resin. Preferably, a copolymer of a monomer such as methyl methacrylate, ethyl methacrylate, 2-ethylhexyl methacrylate and methacrylic acid having a carboxyl group is used. However, it is not limited to this. In addition, a copolymer of the exemplified methacryl / acrylic monomer and a vinyl monomer or olefin monomer can also be used. Examples of vinyl monomers include styrene, α-methylstyrene, acrylonitrile, and examples of olefin monomers include ethylene and propylene.
　パーフロオロポリエーテル誘導体には例えばリン酸エステル系誘導体、ポリウレタン系誘導体、カルボキシル系誘導体が挙げられる。ワックスエマルジョンには、パラフィン系、カルナバ系、マイクロクリスタリン系、低融点ポリエチレン系、脂肪酸エステル系、脂肪酸系、石油油脂系、合成樹脂系などのワックスエマルジョンが単独で（または混合されて）使用される。 Examples of perfluoropolyether derivatives include phosphate ester derivatives, polyurethane derivatives, and carboxyl derivatives. For the wax emulsion, wax emulsions such as paraffin, carnauba, microcrystalline, low melting point polyethylene, fatty acid ester, fatty acid, petroleum oil, and synthetic resin are used alone (or mixed). .
　同様に、包装紙の製造にあたって撥水コート剤が用意される。撥水コート剤は６０～９９［重量部］のスチレン－アクリル系エマルジョンあるいはアクリル系エマルジョンあるいは両者の混合と１～４０［重量部］のワックスエマルジョンとを含む。好ましくは、撥水コート剤は７０～９８［重量部］のスチレン－アクリル系エマルジョンあるいはアクリル系エマルジョンあるいは両者の混合と２～３０［重量部］のワックスエマルジョンとを含む。ワックスエマルジョンは撥水性の付与を目的に添加される。 Similarly, a water-repellent coating agent is prepared for the production of wrapping paper. The water repellent coating agent contains 60 to 99 [parts by weight] of a styrene-acrylic emulsion or acrylic emulsion or a mixture of both and 1 to 40 [parts by weight] of a wax emulsion. Preferably, the water repellent coating agent comprises 70 to 98 [parts by weight] of a styrene-acrylic emulsion or acrylic emulsion or a mixture of both and 2 to 30 [parts by weight] of a wax emulsion. The wax emulsion is added for the purpose of imparting water repellency.
　好ましくは、スチレン－アクリル系エマルジョンには耐水性に優れたものが使用される。ここでは、スチレンモノマーと前述のメタクリル・アクリル系モノマーとの共重合体樹脂エマルジョンが使用される。好ましくは、スチレンモノマーとメタクリル・アクリル系モノマーとの重合比率は１０重量％対９０重量％～５０重量％対５０重量％に設定される。ただし、重合比率はこれに限定されるものではない。その他、共重合体樹脂エマルジョンは、α－メチルスチレン、アクリロニトリルなどのビニルモノマーや、ブタジエンなどのジエンモノマーとの間で共重合体を形成してもよい。 Preferably, a styrene-acrylic emulsion having excellent water resistance is used. Here, a copolymer resin emulsion of a styrene monomer and the aforementioned methacryl / acrylic monomer is used. Preferably, the polymerization ratio of the styrene monomer to the methacryl / acrylic monomer is set to 10% by weight to 90% by weight to 50% by weight to 50% by weight. However, the polymerization ratio is not limited to this. In addition, the copolymer resin emulsion may form a copolymer with vinyl monomers such as α-methylstyrene and acrylonitrile and diene monomers such as butadiene.
　加えて、耐油コート剤と撥水コート剤には必要に応じて体質顔料が添加されてもよい。体質顔料の添加に基づき通気性や水蒸気透過性が付与される。体質顔料には、重炭酸カルシウム、軽炭酸カルシウム、沈降性硫酸バリウム、微粉シリカ、珪砂、含水珪酸マグネシウム、カオリンクレー、ベントナイト、シラスバルーンなどが挙げられる。 In addition, extender pigments may be added to the oil-resistant coating agent and the water-repellent coating agent as necessary. Breathability and water vapor permeability are imparted based on the addition of extender pigments. Examples of extender pigments include calcium bicarbonate, light calcium carbonate, precipitated barium sulfate, fine silica, silica sand, hydrous magnesium silicate, kaolin clay, bentonite, and shirasu balloon.
　図５に示されるように、圧胴２２の円筒面２３には原反すなわち紙帯が巻き付けられる。第１～第６版胴２７ａ～２７ｆは圧胴２２に押し付けられる。圧胴２２の回転に応じて圧胴２２の円筒面２３周りで紙帯３５が送られる。圧胴２２の回転に連動して個々のドラム軸２９回りで第１～第６版胴２７ａ～２７ｆが紙帯３５の送りに対して同一の回転方向に回転する。 As shown in FIG. 5, an original fabric, that is, a paper band is wound around the cylindrical surface 23 of the impression cylinder 22. The first to sixth plate cylinders 27 a to 27 f are pressed against the impression cylinder 22. A paper strip 35 is fed around the cylindrical surface 23 of the impression cylinder 22 in accordance with the rotation of the impression cylinder 22. The first to sixth plate cylinders 27 a to 27 f rotate in the same rotation direction with respect to the feeding of the paper band 35 around the individual drum shafts 29 in conjunction with the rotation of the impression cylinder 22.
　第１版胴２７ａから紙帯３５に撥水コート剤が塗工される。紙帯３５の片面に撥水コート層が形成される。第１版胴２７ａに続いて紙帯３５は第２～第６版胴２７ｂ～２７ｆを相次いで通過する。第２～第６版胴２７ｂ～２７ｆから順番に水性フレキソインクが紙帯３５に供給される。撥水コート層の表面に図柄や文字、背景が印刷される。こうしてインク印刷層が形成される。こうして包装紙１１の裏面が仕上がる。 A water repellent coating agent is applied to the paper belt 35 from the first plate cylinder 27a. A water repellent coating layer is formed on one side of the paper band 35. Following the first plate cylinder 27a, the paper band 35 passes through the second to sixth plate cylinders 27b to 27f one after another. Aqueous flexographic ink is supplied to the paper band 35 in order from the second to sixth plate cylinders 27b to 27f. A pattern, characters and background are printed on the surface of the water repellent coating layer. Thus, an ink print layer is formed. Thus, the back surface of the wrapping paper 11 is finished.
　この製造方法では水性フレキソインクの供給に先立って紙帯３５の片面に撥水コート層が直に形成されることから、半乾きの撥水コート層の働きで水性フレキソインクの含水成分の染み込みは十分に抑制される。その結果、フレキソ多色印刷機２１で圧胴２２の汚染は防止されることができる。特に、インク印刷層の形成にあたって異なる色の水性フレキソインクで複数回に分けて連続的に重ね刷りが実施されても、撥水コート層の存在によりフレキソ多色印刷機２１の圧胴２の汚染は防止されることができる。撥水コート剤の塗布量は０．１～５．０［ｇ／ｍ２］に設定されることから、紙帯３５に対して撥水コート剤の含水成分の染み込みは回避される。 In this manufacturing method, since the water repellent coating layer is formed directly on one side of the paper band 35 prior to the supply of the water-based flexographic ink, the water-containing component of the water-based flexographic ink is not soaked by the semi-dry water-repellent coating layer. Sufficiently suppressed. As a result, the contamination of the impression cylinder 22 can be prevented by the flexo multicolor printer 21. In particular, even when overprinting is continuously performed in a plurality of times with water-based flexo inks of different colors when forming the ink printing layer, contamination of the impression cylinder 2 of the flexo multicolor printing machine 21 due to the presence of the water-repellent coating layer. Can be prevented. Since the coating amount of the water repellent coating agent is set to 0.1 to 5.0 [g / m 2 ], the water content component of the water repellent coating agent is prevented from penetrating into the paper band 35.
　しかも、同一の圧胴２２上で相次いで撥水コート層およびインク印刷層が形成されることから、紙帯３５の表面では未だ湿った状態の撥水コート層上に水性フレキソインクは供給される。その結果、撥水コート層の表面に水性フレキソインクは十分に固定されることができる。乾燥に応じて水性フレキソインクは撥水コート層の表面に定着することができる。 Moreover, since the water repellent coating layer and the ink printing layer are successively formed on the same impression cylinder 22, the water-based flexographic ink is supplied onto the water repellent coating layer that is still wet on the surface of the paper belt 35. . As a result, the water-based flexographic ink can be sufficiently fixed on the surface of the water repellent coating layer. The water-based flexographic ink can be fixed on the surface of the water repellent coating layer upon drying.
　その後、圧胴２２の円筒面２３に再び紙帯３５が巻き付けられる。紙帯３５は、撥水コート層を有する面で円筒面２３に接触する。撥水コート層を有する面の裏側の面で紙帯３５には第８版胴２７ｈが接触する。圧胴２２の回転に応じて圧胴２２の円筒面２３周りで紙帯３５が送られる。第８版胴２７ｈから紙帯３５に耐油コート剤が塗工される。その結果、紙帯３５の片面には耐油コート層が形成される。こうして包装紙１１の表面が仕上がる。その後、紙帯３５は個々の包装紙１１に裁断される。こうして包装紙１１は製造される。 Thereafter, the paper strip 35 is wound around the cylindrical surface 23 of the impression cylinder 22 again. The paper band 35 is in contact with the cylindrical surface 23 at the surface having the water repellent coating layer. The eighth plate cylinder 27h is in contact with the paper belt 35 on the back surface of the surface having the water repellent coating layer. A paper strip 35 is fed around the cylindrical surface 23 of the impression cylinder 22 in accordance with the rotation of the impression cylinder 22. An oil-resistant coating agent is applied to the paper strip 35 from the eighth plate cylinder 27h. As a result, an oil-resistant coating layer is formed on one side of the paper band 35. Thus, the surface of the wrapping paper 11 is finished. Thereafter, the paper band 35 is cut into individual wrapping paper 11. Thus, the wrapping paper 11 is manufactured.
　包装紙１１の製造にあたって、前述とは反対に、紙帯３５の片面で耐油コート層が形成された後に、耐油コート層を有する面の裏側の面で紙帯３５に撥水コート層およびインク印刷層が形成されてもよい。この場合には、１層の耐油コート層１３のみが片面に形成されることから、紙帯３５に対して耐油コート剤の含水成分の染み込みは抑制される。その結果、耐油コート剤の塗工にあたって圧胴２２の汚染は防止されることができる。 In manufacturing the wrapping paper 11, contrary to the above, after the oil-resistant coating layer is formed on one side of the paper band 35, the water-repellent coating layer and ink printing are applied to the paper band 35 on the back side of the surface having the oil-resistant coating layer. A layer may be formed. In this case, since only one oil-resistant coating layer 13 is formed on one side, the penetration of the water-containing component of the oil-resistant coating agent into the paper band 35 is suppressed. As a result, contamination of the impression cylinder 22 can be prevented when the oil resistant coating agent is applied.
　図６は第２実施形態に係る包装紙１１ａの積層構造を概略的に示す。この第２実施形態では第１実施形態に係る包装紙１１で原紙１２の裏面１２ｂにインク印刷層１５を覆うさらなる撥水コート層３７が形成される。撥水コート層３７は原紙１２の裏面１２ｂ全域で撥水コート層１４およびインク印刷層１５を覆う。こうして撥水コート層１４と撥水コート層３７との間にインク印刷層１５は挟み込まれる。ここでは、撥水コート層１４および撥水コート層３７の塗布量は総計で０．１～５．０［ｇ／ｍ２］である。好ましくは、撥水コート層１４および撥水コート層３７の塗布量の総計は０．２～３．５［ｇ／ｍ２］に設定される。この包装紙１１ａでは、前述と同様に、実用的な透湿性および通気性を損なわずに耐水性および耐油性は確保されることができる。第１実施形態の構成と均等な構成には同一の参照符号が付され、その詳細な説明は割愛される。 FIG. 6 schematically shows a laminated structure of the wrapping paper 11a according to the second embodiment. In the second embodiment, a further water-repellent coating layer 37 that covers the ink printing layer 15 is formed on the back surface 12 b of the base paper 12 with the wrapping paper 11 according to the first embodiment. The water repellent coating layer 37 covers the water repellent coating layer 14 and the ink printing layer 15 over the entire back surface 12 b of the base paper 12. Thus, the ink printing layer 15 is sandwiched between the water repellent coating layer 14 and the water repellent coating layer 37. Here, the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 37 is 0.1 to 5.0 [g / m 2 ]. Preferably, the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 37 is set to 0.2 to 3.5 [g / m 2 ]. In the wrapping paper 11a, as described above, water resistance and oil resistance can be ensured without impairing practical moisture permeability and air permeability. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
　この包装紙１１ａでは撥水コート層３７はインク印刷層１５の保護層として機能する。インク印刷層１５の脱落は防止される。しかも、前述のように包装紙１１ａがハンバーガー１６を包み込んだ際に、撥水コート層１４は包みの外面で水分の進入を阻止する。ハンバーガー１６は包みの外側からの水分から保護されることができる。原紙１２は水分から保護されることができる。その結果、水分に基づく包装紙１１ａの破れは確実に防止されることができる。 In this wrapping paper 11 a, the water repellent coating layer 37 functions as a protective layer for the ink printing layer 15. The ink print layer 15 is prevented from falling off. Moreover, as described above, when the wrapping paper 11a wraps the hamburger 16, the water repellent coating layer 14 prevents moisture from entering on the outer surface of the wrapping. The hamburger 16 can be protected from moisture from the outside of the package. The base paper 12 can be protected from moisture. As a result, tearing of the wrapping paper 11a based on moisture can be reliably prevented.
　包装紙１１ａの製造にあたって紙帯３５の片面では耐油コート剤が塗工される。紙帯３５の他面では撥水コート剤、水性フレキソインクおよび撥水コート剤が順番に塗工され印刷される。原紙１２の裏面１２ｂでは撥水コート層１４、３７は２層で構成されることから所与の撥水効果を得るために必要な総坪量は２層に分割されることができる。こうすると、各撥水コート層１４、３７の坪量は、撥水コート層が一層であるときよりも小さくて済む。撥水コート層１４の塗布量は抑制される。その結果、耐油コート層１３の形成に先立って撥水コート層１４が形成される際に、原紙１２の裏面１２ｂに直接に印刷される撥水コート層１４の印刷時の含水成分は減少し、紙帯３５に対して撥水コート剤の含水成分の染み込みは一層抑制される。薄い原紙１２を通してフレキソ多色印刷機２１の圧胴２２の汚染は回避されることができる。しかも、前述と同様に、撥水コート層１４の塗工に続いて水性フレキソインクが印刷されることから、紙帯３５に対して水性フレキソインクの含水成分の染み込みは確実に回避されることができる。圧胴２２の汚染は回避されることができる。その他、前述の第１実施形態と同様に、包装紙１１ａの製造にあたって最初に耐油コート層が紙帯３５の片面に形成されてもよい。 In manufacturing the wrapping paper 11a, an oil-resistant coating agent is applied on one side of the paper strip 35. On the other side of the paper band 35, a water repellent coating agent, a water-based flexographic ink, and a water repellent coating agent are sequentially applied and printed. Since the water repellent coating layers 14 and 37 are composed of two layers on the back surface 12b of the base paper 12, the total basis weight necessary for obtaining a given water repellent effect can be divided into two layers. In this case, the basis weight of each of the water repellent coating layers 14 and 37 may be smaller than when the water repellent coating layer is a single layer. The application amount of the water repellent coating layer 14 is suppressed. As a result, when the water repellent coating layer 14 is formed prior to the formation of the oil-resistant coating layer 13, the water content component during printing of the water repellent coating layer 14 printed directly on the back surface 12b of the base paper 12 is reduced. Infiltration of the water-containing component of the water repellent coating agent into the paper band 35 is further suppressed. Contamination of the impression cylinder 22 of the flexo multicolor printing machine 21 through the thin base paper 12 can be avoided. Moreover, since the water-based flexographic ink is printed subsequent to the application of the water-repellent coating layer 14 as described above, the penetration of the water-containing component of the water-based flexographic ink into the paper strip 35 can be reliably avoided. it can. Contamination of the impression cylinder 22 can be avoided. In addition, similarly to the first embodiment described above, an oil-resistant coating layer may be first formed on one side of the paper strip 35 in the manufacture of the wrapping paper 11a.
　図７は第３実施形態に係る包装紙１１ｂの積層構造を概略的に示す。この第３実施形態では第１実施形態に係る包装紙１１で原紙１２の裏面１２ｂと撥水コート層１４との間にさらなる耐油コート層３８が挟み込まれる。耐油コート層３８の塗布量は０．１～３．０［ｇ／ｍ２］である。好ましくは、耐油コート層３８の塗布量は０．２～２．０［ｇ／ｍ２］に設定される。第１実施形態の構成と均等な構成には同一の参照符号が付され、その詳細な説明は割愛される。 FIG. 7 schematically shows a laminated structure of the wrapping paper 11b according to the third embodiment. In the third embodiment, a further oil-resistant coating layer 38 is sandwiched between the back surface 12 b of the base paper 12 and the water-repellent coating layer 14 in the wrapping paper 11 according to the first embodiment. The coating amount of the oil resistant coating layer 38 is 0.1 to 3.0 [g / m 2 ]. Preferably, the coating amount of the oil resistant coating layer 38 is set to 0.2 to 2.0 [g / m 2 ]. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
　この第３実施形態では、原紙１２の表面１２ａおよび裏面１２ｂにそれぞれ耐油コート層１３、３８が設けられることで、所与の耐油効果を得るために必要な総坪量は２層に分割されることができる。こうすると、各耐油コート層１３、３８の坪量は、耐油コート層が一層であるときよりも小さくて済む。したがって、個々の耐油コート層１３、３８では通気性は高められることができる。耐油コート層１３、３８同士の間に原紙１２が挟まれることから、耐油コート層１３、３８同士が直接に重ねられる場合に比べて通気性は維持されることができる。しかも、耐油コート層１３は原紙１２の表面１２ａに付着し油の染み込みを抑制する。油は耐油コート層１３の表面で広がる。低い密度で耐油コート層１３を通過する。耐油コート層１３を通過した油は原紙１２内で拡散する。さらに油の密度は低下する。その結果、耐油コート層３８で十分に油は堰き止められる。耐油コート層３８の外側では油の染み出しは防止されることができる。こうして包装紙１１ｂは、耐油コート層１３、３８で原紙１２を挟み込むことで、これまで以上に十分な通気性を維持しつつ所定の耐油機能を実現することができる。 In the third embodiment, the total basis weight necessary for obtaining a given oil resistance effect is divided into two layers by providing the oil resistance coat layers 13 and 38 on the front surface 12a and the back surface 12b of the base paper 12, respectively. be able to. In this way, the basis weight of each oil- resistant coat layer 13, 38 may be smaller than when the oil-resistant coat layer is a single layer. Therefore, the breathability can be enhanced in the individual oil-resistant coating layers 13 and 38. Since the base paper 12 is sandwiched between the oil-resistant coat layers 13 and 38, the air permeability can be maintained as compared with the case where the oil-resistant coat layers 13 and 38 are directly stacked. In addition, the oil-resistant coating layer 13 adheres to the surface 12a of the base paper 12 and suppresses the permeation of oil. The oil spreads on the surface of the oil resistant coating layer 13. It passes through the oil-resistant coating layer 13 at a low density. The oil that has passed through the oil resistant coating layer 13 diffuses in the base paper 12. Furthermore, the density of the oil decreases. As a result, the oil is sufficiently blocked by the oil resistant coating layer 38. Oil can be prevented from exuding outside the oil-resistant coating layer 38. In this way, the wrapping paper 11b can achieve a predetermined oil resistance function while maintaining sufficient air permeability than before by sandwiching the base paper 12 between the oil resistance coat layers 13 and 38.
　加えて、耐油コート層が一層であるときよりも各耐油コート層１３、３８の坪量が小さくて済むと、原紙１２の裏面１２ｂでは耐油コート層３８の塗布量は抑制される。その結果、耐油コート層１３の形成に先立って耐油コート層３８が形成される際に、原紙１２の裏面１２ｂに直接に印刷される耐油コート層３８の印刷時の含水成分はより減少し、紙帯３５に対して耐油コート剤の含水成分の染み込みは抑制される。薄い原紙１２を通してフレキソ多色印刷機２１の圧胴２２の汚染は回避されることができる。しかも、前述と同様に、撥水コート層１４の塗工に続いて水性フレキソインクが印刷されることから、紙帯３５に対して水性フレキソインクの含水成分の染み込みは確実に回避されることができる。圧胴２２の汚染は回避されることができる。その他、前述の第１実施形態と同様に、包装紙１１ｂの製造にあたって最初に耐油コート層が紙帯３５の片面に形成されてもよい。 In addition, if the basis weight of each of the oil-resistant coat layers 13 and 38 is smaller than when the oil-resistant coat layer is a single layer, the amount of the oil-resistant coat layer 38 applied on the back surface 12b of the base paper 12 is suppressed. As a result, when the oil-resistant coat layer 38 is formed prior to the formation of the oil-resistant coat layer 13, the moisture content during printing of the oil-resistant coat layer 38 printed directly on the back surface 12b of the base paper 12 is further reduced, and the paper Infiltration of the water-containing component of the oil-resistant coating agent into the band 35 is suppressed. Contamination of the impression cylinder 22 of the flexo multicolor printing machine 21 through the thin base paper 12 can be avoided. Moreover, since the water-based flexographic ink is printed subsequent to the application of the water-repellent coating layer 14 as described above, the penetration of the water-containing component of the water-based flexographic ink into the paper strip 35 can be reliably avoided. it can. Contamination of the impression cylinder 22 can be avoided. In addition, as in the first embodiment described above, an oil-resistant coating layer may be first formed on one side of the paper strip 35 in the manufacture of the wrapping paper 11b.
　耐油コート層１３、３８はアクリル系エマルジョンおよびパーフロオロポリエーテル誘導体を含む。こうしてパーフロオロポリエーテル誘導体が混合されると、撥油性が高まり、アクリル系エマルジョンの減量が実現される。すなわち、パーフロオロポリエーテル誘導体が混ぜ合わせられない場合に比べて、アクリル系エマルジョンの塗布量は抑えられることができる。その結果、フレキソ印刷の実施にあたって含水成分の総量は減少する。印刷中に紙帯３５から水分が染み出てフレキソ多色印刷機２１の圧胴２２を汚染することは防止されることができる。パーフロオロポリエーテル誘導体といったフッ素系化合物が併用されないと、多くの塗布量が必要とされ、フレキソ印刷の実施にあたって含水成分の総量は増加してしまう。印刷中に紙帯３５から水分が染み出てフレキソ多色印刷機２１の圧胴２２を汚染してしまう。こうした圧胴２２の汚染の防止にあたって耐油コート剤は少なくとも０．２［重量部］のパーフロオロポリエーテル誘導体を含む。好ましくは、耐油コート剤は０．５［重量部］以上のパーフロオロポリエーテル誘導体を含む。 The oil-resistant coating layers 13 and 38 contain an acrylic emulsion and a perfluoropolyether derivative. When the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the paper band 35 during printing and contaminating the impression cylinder 22 of the flexo multicolor printing machine 21. If a fluorine-based compound such as a perfluoropolyether derivative is not used in combination, a large amount of coating is required, and the total amount of water-containing components increases when flexographic printing is performed. During printing, moisture exudes from the paper strip 35 and contaminates the impression cylinder 22 of the flexo multicolor printing machine 21. In preventing the contamination of the impression cylinder 22, the oil-resistant coating agent contains at least 0.2 [parts by weight] of a perfluoropolyether derivative. Preferably, the oil-resistant coating agent contains 0.5 [parts by weight] or more of a perfluoropolyether derivative.
　その一方で、アクリル系エマルジョンは原紙１２の表面に膜を形成し、水分の染み込みを防止する。原紙１２は水分から保護されることができる。水分に基づく原紙１２の破れは防止されることができる。パーフロオロポリエーテル誘導体が単独で塗布されると、水分の染み込みを防止する能力が低下し、水分は原紙１２に染み込む。原紙１２の破れが懸念されてしまう。こうした水分の染み込みの防止にあたって耐油コート剤は少なくとも４０［重量部］のアクリル系エマルジョンを含む。好ましくは、耐油コート剤は７０［重量部］以上のアクリル系エマルジョンを含む。 On the other hand, the acrylic emulsion forms a film on the surface of the base paper 12 and prevents moisture penetration. The base paper 12 can be protected from moisture. Tearing of the base paper 12 based on moisture can be prevented. When the perfluoropolyether derivative is applied alone, the ability to prevent the penetration of moisture is reduced, and the moisture soaks into the base paper 12. There is a concern that the base paper 12 is torn. In preventing such water penetration, the oil-resistant coating agent contains at least 40 [parts by weight] of an acrylic emulsion. Preferably, the oil-resistant coating agent contains 70 [parts by weight] or more of an acrylic emulsion.
　図８は第４実施形態に係る包装紙１１ｃの積層構造を概略的に示す。この第４実施形態では第３実施形態に係る包装紙１１ｂでインク印刷層１５を覆うさらなる撥水コート層３９が形成される。撥水コート層３９は例えば原紙１２の裏面１２ｂ全域で撥水コート層１４およびインク印刷層１５を覆う。こうして撥水コート層１４と撥水コート層３９との間にインク印刷層１５は挟み込まれる。ここでは、撥水コート層１４および撥水コート層３９の塗布量は総計で０．１～５．０［ｇ／ｍ２］である。好ましくは、撥水コート層１４および撥水コート層３９の塗布量の総計は０．２～３．５［ｇ／ｍ２］に設定される。この包装紙１１ｃでは、前述と同様に、実用的な透湿性および通気性を損なわずに耐水性および耐油性は確保されることができる。撥水コート層３９はインク印刷層１５の保護層として機能する。インク印刷層１５の脱落は防止される。第１～第３実施形態の構成と均等な構成には同一の参照符号が付され、その詳細な説明は割愛される。 FIG. 8 schematically shows a laminated structure of the wrapping paper 11c according to the fourth embodiment. In the fourth embodiment, a further water repellent coating layer 39 that covers the ink printing layer 15 with the wrapping paper 11b according to the third embodiment is formed. The water repellent coating layer 39 covers, for example, the water repellent coating layer 14 and the ink printing layer 15 over the entire back surface 12 b of the base paper 12. Thus, the ink printing layer 15 is sandwiched between the water repellent coating layer 14 and the water repellent coating layer 39. Here, the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 39 is 0.1 to 5.0 [g / m 2 ]. Preferably, the total coating amount of the water repellent coating layer 14 and the water repellent coating layer 39 is set to 0.2 to 3.5 [g / m 2 ]. In the wrapping paper 11c, as described above, water resistance and oil resistance can be ensured without impairing practical moisture permeability and air permeability. The water repellent coating layer 39 functions as a protective layer for the ink print layer 15. The ink print layer 15 is prevented from falling off. Components equivalent to those of the first to third embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.
　図９は第５実施形態に係る包装紙１１ｄの積層構造を概略的に示す。この第５実施形態では第２実施形態に係る包装紙１１ａで撥水コート層１４に代えて原紙１２の裏面１２ｂとインク印刷層１５との間にさらなる耐油コート層４１が挟み込まれる。耐油コート層４１の塗布量は０．１～３．０［ｇ／ｍ２］である。好ましくは、耐油コート層４１の塗布量は０．２～２．０［ｇ／ｍ２］に設定される。第１～第４実施形態の構成と均等な構成には同一の参照符号が付され、その詳細な説明は割愛される。 FIG. 9 schematically shows a laminated structure of the wrapping paper 11d according to the fifth embodiment. In the fifth embodiment, a further oil-resistant coating layer 41 is sandwiched between the back surface 12b of the base paper 12 and the ink printing layer 15 instead of the water-repellent coating layer 14 in the wrapping paper 11a according to the second embodiment. The coating amount of the oil resistant coating layer 41 is 0.1 to 3.0 [g / m 2 ]. Preferably, the coating amount of the oil resistant coating layer 41 is set to 0.2 to 2.0 [g / m 2 ]. Components equivalent to those of the first to fourth embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.
　包装紙１１ｄの製造にあたって紙帯３５の片面では耐油コート剤が塗工される。紙帯３５の他面では耐油コート剤、水性フレキソインクおよび撥水コート剤が順番に塗工され印刷される。耐油コート層４１の形成にあたって耐油コート剤には０（含まない）～５［重量部］のワックスエマルジョンすなわち撥水成分が含まれる。その結果、耐油コート層４１は撥水機能を発揮する。水性フレキソインクの供給に先立って紙帯３５の片面に撥水機能を有する耐油コート層が形成されることから、耐油コート層の働きで水性フレキソインクの含水成分の染み込みは十分に抑制される。その結果、フレキソ多色印刷機２１で圧胴２２の汚染は防止されることができる。 In producing the wrapping paper 11d, an oil-resistant coating agent is applied to one side of the paper strip 35. On the other side of the paper band 35, an oil-resistant coating agent, a water-based flexographic ink, and a water-repellent coating agent are sequentially applied and printed. In forming the oil-resistant coating layer 41, the oil-resistant coating agent contains 0 (not included) to 5 [parts by weight] of a wax emulsion, that is, a water repellent component. As a result, the oil resistant coat layer 41 exhibits a water repellent function. Since the oil-resistant coating layer having a water-repellent function is formed on one surface of the paper strip 35 prior to the supply of the water-based flexographic ink, the oil-resistant component of the water-based flexographic ink is sufficiently suppressed by the function of the oil-resistant coating layer. As a result, the contamination of the impression cylinder 22 can be prevented by the flexo multicolor printer 21.
　この包装紙１１ｄでは原紙１２の表面１２ａおよび裏面１２ｂにそれぞれ耐油コート層１３、４１が設けられることで、所与の耐油効果を得るために必要な総坪量は２層に分割されることができる。こうすると、各耐油コート層１３、４１の坪量は、耐油コート層が一層であるときよりも小さくて済む。したがって、個々の耐油コート層１３、４１では通気性は高められることができる。耐油コート層１３、４１同士の間に原紙１２が挟まれることから、耐油コート層１３、４１同士が直接に重ねられる場合に比べて十分な通気性は確保されることができる。しかも、耐油コート層１３は原紙１２の表面１２ａに付着し油の染み込みを抑制する。油は耐油コート層１３の表面で広がる。低い密度で耐油コート層１３を通過する。耐油コート層１３を通過した油は原紙１２内で拡散する。さらに油の密度は低下する。その結果、耐油コート層４１で十分に油は堰き止められる。耐油コート層４１の外側では油の染み出しは防止されることができる。こうして包装紙１１ｄは、耐油コート層１３、４１で原紙１２を挟み込むことで、これまで以上に十分な通気性を維持しつつ所定の耐油機能を実現することができる。 In this wrapping paper 11d, by providing the oil-resistant coating layers 13 and 41 on the front surface 12a and the back surface 12b of the base paper 12, respectively, the total basis weight necessary to obtain a given oil-resistant effect can be divided into two layers. it can. If it carries out like this, the basic weight of each oil-resistant coat layers 13 and 41 may be smaller than when an oil-resistant coat layer is one layer. Therefore, the air permeability can be enhanced in the individual oil-resistant coat layers 13 and 41. Since the base paper 12 is sandwiched between the oil-resistant coat layers 13 and 41, sufficient air permeability can be ensured as compared with the case where the oil-resistant coat layers 13 and 41 are directly stacked. In addition, the oil-resistant coating layer 13 adheres to the surface 12a of the base paper 12 and suppresses the permeation of oil. The oil spreads on the surface of the oil resistant coating layer 13. It passes through the oil-resistant coating layer 13 at a low density. The oil that has passed through the oil resistant coating layer 13 diffuses in the base paper 12. Furthermore, the density of the oil decreases. As a result, the oil is sufficiently blocked by the oil resistant coating layer 41. Oil can be prevented from exuding outside the oil-resistant coating layer 41. In this way, the wrapping paper 11d can realize a predetermined oil resistance function while maintaining sufficient air permeability more than before by sandwiching the base paper 12 between the oil resistance coat layers 13 and 41.
　加えて、耐油コート層が一層であるときよりも各耐油コート層１３、４１の坪量が小さくて済むと、原紙１２の裏面１２ｂでは耐油コート層４１の塗布量は抑制される。その結果、耐油コート層１３の形成に先立って耐油コート層４１が形成される際に、原紙１２の裏面１２ｂに直接に印刷される耐油コート層４１の印刷時の含水成分はより減少し、紙帯３５に対して耐油コート剤の含水成分の染み込みは抑制される。薄い原紙１２を通してフレキソ多色印刷機２１の圧胴２２の汚染は回避されることができる。その他、前述の第１～第４実施形態と同様に、包装紙１１ｄの製造にあたって最初に耐油コート層が紙帯３５の片面に形成されてもよい。 In addition, if the basis weight of each of the oil resistant coat layers 13 and 41 is smaller than when the oil resistant coat layer is a single layer, the amount of the oil resistant coat layer 41 applied on the back surface 12b of the base paper 12 is suppressed. As a result, when the oil-resistant coat layer 41 is formed prior to the formation of the oil-resistant coat layer 13, the moisture content during printing of the oil-resistant coat layer 41 printed directly on the back surface 12b of the base paper 12 is further reduced, and the paper Infiltration of the water-containing component of the oil-resistant coating agent into the band 35 is suppressed. Contamination of the impression cylinder 22 of the flexo multicolor printing machine 21 through the thin base paper 12 can be avoided. In addition, as in the first to fourth embodiments described above, an oil-resistant coating layer may be first formed on one side of the paper strip 35 in the manufacture of the wrapping paper 11d.
　耐油コート層１３、４１はアクリル系エマルジョンおよびパーフロオロポリエーテル誘導体を含む。こうしてパーフロオロポリエーテル誘導体が混合されると、撥油性が高まり、アクリル系エマルジョンの減量が実現される。すなわち、パーフロオロポリエーテル誘導体が混ぜ合わせられない場合に比べて、アクリル系エマルジョンの塗布量は抑えられることができる。その結果、フレキソ印刷の実施にあたって含水成分の総量は減少する。印刷中に紙帯３５から水分が染み出てフレキソ多色印刷機２１の圧胴２２を汚染することは防止されることができる。パーフロオロポリエーテル誘導体といったフッ素系化合物が併用されないと、多くの塗布量が必要とされ、フレキソ印刷の実施にあたって含水成分の総量は増加してしまう。印刷中に紙帯３５から水分が染み出てフレキソ多色印刷機２１の圧胴２２を汚染してしまう。こうした圧胴２２の汚染の防止にあたって耐油コート剤は少なくとも０．２［重量部］のパーフロオロポリエーテル誘導体を含む。好ましくは、耐油コート剤は０．５［重量部］以上のパーフロオロポリエーテル誘導体を含む。 The oil-resistant coating layers 13 and 41 contain an acrylic emulsion and a perfluoropolyether derivative. When the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the paper band 35 during printing and contaminating the impression cylinder 22 of the flexo multicolor printing machine 21. If a fluorine-based compound such as a perfluoropolyether derivative is not used in combination, a large amount of coating is required, and the total amount of water-containing components increases when flexographic printing is performed. During printing, moisture exudes from the paper strip 35 and contaminates the impression cylinder 22 of the flexo multicolor printing machine 21. In preventing the contamination of the impression cylinder 22, the oil-resistant coating agent contains at least 0.2 [parts by weight] of a perfluoropolyether derivative. Preferably, the oil-resistant coating agent contains 0.5 [parts by weight] or more of a perfluoropolyether derivative.
　その一方で、アクリル系エマルジョンは原紙１２の表面に膜を形成し、水分の染み込みを防止する。原紙１２は水分から保護されることができる。水分に基づく原紙１２の破れは防止されることができる。パーフロオロポリエーテル誘導体が単独で塗布されると、水分の染み込みを防止する能力が低下し、水分は原紙１２に染み込む。原紙１２の破れが懸念されてしまう。こうした水分の染み込みの防止にあたって耐油コート剤は少なくとも４０［重量部］のアクリル系エマルジョンを含む。好ましくは、耐油コート剤は７０［重量部］以上のアクリル系エマルジョンを含む。 On the other hand, the acrylic emulsion forms a film on the surface of the base paper 12 and prevents moisture penetration. The base paper 12 can be protected from moisture. Tearing of the base paper 12 based on moisture can be prevented. When the perfluoropolyether derivative is applied alone, the ability to prevent the penetration of moisture is reduced, and the moisture soaks into the base paper 12. There is a concern that the base paper 12 is torn. In preventing such water penetration, the oil-resistant coating agent contains at least 40 [parts by weight] of an acrylic emulsion. Preferably, the oil-resistant coating agent contains 70 [parts by weight] or more of an acrylic emulsion.
　図１０は第６実施形態に係る包装紙１１ｅの積層構造を概略的に示す。この第６実施形態では前述の耐油コート層（第１耐油コート層）１３に加えて原紙１２の裏面１２ｂにさらなる耐油コート層（第２耐油コート層）４２が形成される。原紙１２の裏面１２ｂと第２耐油コート層４２との間にインク印刷層１５が形成される。すなわち、インク印刷層１５は直に原紙１２の裏面１２ｂに形成される。こうしてインク印刷層１５すなわち図柄や文字、背景像は原紙１２の裏面１２ｂと第２耐油コート層４２との間に挟み込まれる。第２耐油コート層４２は原紙１２の裏面１２ｂ全域を覆う。第２耐油コート層４２は少なくともハンバーガーといったファーストフードを直接に包み込む範囲で満遍なく原紙１２の裏面１２ｂおよびインク印刷層１５を覆えばよい。第１耐油コート層１３および第２耐油コート層４２の塗布量は総計で０．１～５．０［ｇ／ｍ２］である。好ましくは、第１耐油コート層１３および第２耐油コート層４２の塗布量の総計は０．２～３．５［ｇ／ｍ２］に設定される。第２耐油コート層４２は所定の通気性を有する。この第６実施形態では撥水コート層は省略される。第１耐油コート層１３および第２耐油コート層４２は原紙１２に付着して原紙１２の耐水性を高める。前述のいずれかの実施形態の構成と均等な構成には同一の参照符号が付され、その詳細な説明は割愛される。包装紙１１ｅは第１実施形態に係る包装紙１１と同様に製造されればよい。ただし、原紙１２の裏面１２ｂにはインク印刷層１５の形成後に第２耐油コート層４２が形成される。 FIG. 10 schematically shows a laminated structure of the wrapping paper 11e according to the sixth embodiment. In the sixth embodiment, in addition to the oil-resistant coat layer (first oil-resistant coat layer) 13 described above, a further oil-resistant coat layer (second oil-resistant coat layer) 42 is formed on the back surface 12 b of the base paper 12. The ink print layer 15 is formed between the back surface 12 b of the base paper 12 and the second oil-resistant coating layer 42. That is, the ink print layer 15 is directly formed on the back surface 12 b of the base paper 12. In this way, the ink printing layer 15, that is, the design, characters, and background image are sandwiched between the back surface 12 b of the base paper 12 and the second oil-resistant coating layer 42. The second oil-resistant coating layer 42 covers the entire back surface 12 b of the base paper 12. The second oil-resistant coating layer 42 may evenly cover the back surface 12b of the base paper 12 and the ink printing layer 15 as long as at least a fast food such as a hamburger is directly wrapped. The total coating amount of the first oil-resistant coat layer 13 and the second oil-resistant coat layer 42 is 0.1 to 5.0 [g / m 2 ]. Preferably, the total coating amount of the first oil resistant coat layer 13 and the second oil resistant coat layer 42 is set to 0.2 to 3.5 [g / m 2 ]. The second oil resistant coat layer 42 has a predetermined air permeability. In this sixth embodiment, the water repellent coating layer is omitted. The first oil resistant coat layer 13 and the second oil resistant coat layer 42 adhere to the base paper 12 and enhance the water resistance of the base paper 12. The same reference numerals are given to configurations equivalent to the configurations of any of the above-described embodiments, and detailed descriptions thereof are omitted. The wrapping paper 11e may be manufactured similarly to the wrapping paper 11 according to the first embodiment. However, the second oil-resistant coating layer 42 is formed on the back surface 12b of the base paper 12 after the ink printing layer 15 is formed.
　この第６実施形態では、原紙１２の表面１２ａおよび裏面１２ｂに第１耐油コート層１３および第２耐油コート層４２が設けられることで、所与の耐油効果を得るために必要な総坪量は２層に分割されることができる。こうすると、各耐油コート層１３、４２の坪量は、耐油コート層が一層であるときよりも小さくて済む。したがって、第１および第２耐油コート層１３、４２では通気性は高められることができる。第１耐油コート層１３および第２耐油コート層４２の間に原紙１２が挟まれることから、第１および第２耐油コート層１３、４２同士が直接に重ねられる場合に比べて通気性は維持されることができる。しかも、第１耐油コート層１３は原紙１２の表面１２ａに付着し油の染み込みを抑制する。油は第１耐油コート層１３の表面で広がる。低い密度で第１耐油コート層１３を通過する。第１耐油コート層１３を通過した油は原紙１２内で拡散する。さらに油の密度は低下する。その結果、第２耐油コート層４２で十分に油は堰き止められる。第２耐油コート層４２の外側では油の染み出しは防止されることができる。こうして包装紙１１ｅは、第１耐油コート層１３および第２耐油コート層４２で原紙１２を挟み込むことで、これまで以上に十分な通気性を維持しつつ所定の耐油機能を実現することができる。 In this sixth embodiment, the first oil-resistant coat layer 13 and the second oil-resistant coat layer 42 are provided on the front surface 12a and the back surface 12b of the base paper 12, so that the total basis weight necessary for obtaining a given oil resistance effect is It can be divided into two layers. In this case, the basis weight of each of the oil-resistant coat layers 13 and 42 may be smaller than when the oil-resistant coat layer is a single layer. Therefore, the air permeability can be improved in the first and second oil resistant coating layers 13 and 42. Since the base paper 12 is sandwiched between the first oil-resistant coat layer 13 and the second oil-resistant coat layer 42, air permeability is maintained as compared with the case where the first and second oil-resistant coat layers 13 and 42 are directly stacked. Can. Moreover, the first oil-resistant coating layer 13 adheres to the surface 12a of the base paper 12 and suppresses the permeation of oil. The oil spreads on the surface of the first oil resistant coating layer 13. Passes through the first oil-resistant coating layer 13 at a low density. The oil that has passed through the first oil-resistant coating layer 13 diffuses in the base paper 12. Furthermore, the density of the oil decreases. As a result, the oil is sufficiently blocked by the second oil resistant coating layer 42. Oil can be prevented from exuding outside the second oil-resistant coating layer 42. In this way, the wrapping paper 11e can realize a predetermined oil resistance function while maintaining sufficient air permeability more than before by sandwiching the base paper 12 between the first oil resistance coat layer 13 and the second oil resistance coat layer.
　加えて、この第６実施形態では、インク印刷層１５のインクは直接に原紙１２に印刷されることから、インク印刷層１５は見栄えよく仕上げられることができる。したがって、インクが耐油コート層に印刷される場合に比べて、高い意匠性が実現されることができる。 In addition, in the sixth embodiment, since the ink of the ink print layer 15 is printed directly on the base paper 12, the ink print layer 15 can be finished with a good appearance. Therefore, higher designability can be realized as compared with the case where the ink is printed on the oil-resistant coating layer.
　第１および第２耐油コート層１３、４２はアクリル系エマルジョンおよびパーフロオロポリエーテル誘導体を含む。こうしてパーフロオロポリエーテル誘導体が混合されると、撥油性が高まり、アクリル系エマルジョンの減量が実現される。すなわち、パーフロオロポリエーテル誘導体が混ぜ合わせられない場合に比べて、アクリル系エマルジョンの塗布量は抑えられることができる。その結果、フレキソ印刷の実施にあたって含水成分の総量は減少する。印刷中に紙帯３５から水分が染み出てフレキソ多色印刷機２１の圧胴２２を汚染することは防止されることができる。パーフロオロポリエーテル誘導体といったフッ素系化合物が併用されないと、多くの塗布量が必要とされ、フレキソ印刷の実施にあたって含水成分の総量は増加してしまう。印刷中に紙帯３５から水分が染み出てフレキソ多色印刷機２１の圧胴２２を汚染してしまう。こうした圧胴２２の汚染の防止にあたって耐油コート剤は少なくとも０．２［重量部］のパーフロオロポリエーテル誘導体を含む。好ましくは、耐油コート剤は０．５［重量部］以上のパーフロオロポリエーテル誘導体を含む。 The first and second oil resistant coating layers 13 and 42 include an acrylic emulsion and a perfluoropolyether derivative. When the perfluoropolyether derivative is mixed in this way, the oil repellency is enhanced and the weight loss of the acrylic emulsion is realized. That is, the coating amount of the acrylic emulsion can be suppressed as compared with the case where the perfluoropolyether derivative is not mixed. As a result, the total amount of water-containing components is reduced when performing flexographic printing. It is possible to prevent moisture from seeping out from the paper band 35 during printing and contaminating the impression cylinder 22 of the flexo multicolor printing machine 21. If a fluorine-based compound such as a perfluoropolyether derivative is not used in combination, a large amount of coating is required, and the total amount of water-containing components increases when flexographic printing is performed. During printing, moisture exudes from the paper strip 35 and contaminates the impression cylinder 22 of the flexo multicolor printing machine 21. In preventing the contamination of the impression cylinder 22, the oil-resistant coating agent contains at least 0.2 [parts by weight] of a perfluoropolyether derivative. Preferably, the oil-resistant coating agent contains 0.5 [parts by weight] or more of a perfluoropolyether derivative.
　その一方で、アクリル系エマルジョンは原紙１２の表面に膜を形成し、水分の染み込みを防止する。原紙１２は水分から保護されることができる。水分に基づく原紙１２の破れは防止されることができる。パーフロオロポリエーテル誘導体が単独で塗布されると、水分の染み込みを防止する能力が低下し、水分は原紙１２に染み込む。原紙１２の破れが懸念されてしまう。こうした水分の染み込みの防止にあたって耐油コート剤は少なくとも４０［重量部］のアクリル系エマルジョンを含む。好ましくは、耐油コート剤は７０［重量部］以上のアクリル系エマルジョンを含む。 On the other hand, the acrylic emulsion forms a film on the surface of the base paper 12 and prevents moisture penetration. The base paper 12 can be protected from moisture. Tearing of the base paper 12 based on moisture can be prevented. When the perfluoropolyether derivative is applied alone, the ability to prevent the penetration of moisture is reduced, and the moisture soaks into the base paper 12. There is a concern that the base paper 12 is torn. In preventing such water penetration, the oil-resistant coating agent contains at least 40 [parts by weight] of an acrylic emulsion. Preferably, the oil-resistant coating agent contains 70 [parts by weight] or more of an acrylic emulsion.
　さらにまた、第６実施形態では、原紙１２の表面１２ａはいわゆる「ツヤ面」に相当し、原紙１２の裏面１２ｂはいわゆる「ザラ面」に相当する。原紙１２の「ツヤ面」は例えば抄紙工程でミラーロールの接触に応じて確立される。抄紙にあたってパルプの集合体がミラーロールの平滑面に接触すると、「ツヤ面」は形成される。「ツヤ面」の裏側は「ザラ面」になる。「ツヤ面」となる表面１２ａに最初に第１耐油コート層１３が形成され、その後に「ザラ面」となる裏面１２ｂにインク印刷層１５および第２耐油コート層４２が形成されると、「ザラ面」に最初に第１耐油コート層が形成された後に「ツヤ面」にインク印刷層および第２耐油コート層が形成される場合に比べて、圧胴２２の汚染は良好に防止されることが確認された。 Furthermore, in the sixth embodiment, the front surface 12a of the base paper 12 corresponds to a so-called “gloss surface”, and the back surface 12b of the base paper 12 corresponds to a so-called “zara surface”. The “shiny surface” of the base paper 12 is established according to the contact of the mirror roll in the paper making process, for example. A “shiny surface” is formed when the aggregate of pulp contacts the smooth surface of the mirror roll during papermaking. The back side of “Glossy surface” is “Zara surface”. When the first oil-resistant coating layer 13 is first formed on the surface 12a that becomes the “shiny surface”, and then the ink printing layer 15 and the second oil-resistant coating layer 42 are formed on the back surface 12b that becomes the “zara surface”, “ Contamination of the impression cylinder 22 is better prevented than when the ink printing layer and the second oil-resistant coating layer are formed on the “shiny surface” after the first oil-resistant coating layer is first formed on the “zara surface”. It was confirmed.
　図１１は比較例に係る包装紙５１の積層構造を概略的に示す。この比較例では原紙１２の裏面１２ｂに直にインク印刷層１５が形成される。インク印刷層１５は撥水コート層１４で覆われる。撥水コート層１４は原紙１２の裏面１２ｂ全域を覆う。こうしてインク印刷層１５すなわち図柄や文字、背景像は原紙１２の裏面１２ｂと撥水コート層１４との間に挟み込まれる。撥水コート層１４は少なくともハンバーガーといったファーストフードを直接に包み込む範囲で満遍なく原紙１２の裏面１２ｂおよびインク印刷層１５を覆えばよい。この包装紙５１では、前述と同様に、実用的な透湿性および通気性を損なわずに耐水性および耐油性は確保されることができる。包装紙５１は第１実施形態に係る包装紙１１と同様に製造されればよい。ただし、原紙１２の裏面１２ｂにはインク印刷層１５の形成後に撥水コート層１４が形成される。第１実施形態の構成と均等な構成には同一の参照符号が付され、その詳細な説明は割愛される。 FIG. 11 schematically shows a laminated structure of the wrapping paper 51 according to the comparative example. In this comparative example, the ink print layer 15 is formed directly on the back surface 12 b of the base paper 12. The ink print layer 15 is covered with a water repellent coating layer 14. The water repellent coating layer 14 covers the entire back surface 12 b of the base paper 12. Thus, the ink print layer 15, that is, the design, characters, and background image are sandwiched between the back surface 12 b of the base paper 12 and the water repellent coating layer 14. The water-repellent coating layer 14 may cover the back surface 12b of the base paper 12 and the ink printing layer 15 evenly in a range where at least fast food such as a hamburger is directly wrapped. In the wrapping paper 51, as described above, water resistance and oil resistance can be ensured without impairing practical moisture permeability and air permeability. The wrapping paper 51 may be manufactured in the same manner as the wrapping paper 11 according to the first embodiment. However, the water repellent coating layer 14 is formed on the back surface 12 b of the base paper 12 after the ink printing layer 15 is formed. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
　前述のように、包装紙１１、１１ａ～１１ｅでは柔軟で薄い原紙１２が利用される。原紙１２の素材すなわち紙帯３５に水性フレキソ印刷により水性フレキソインクや撥水コート剤、耐油コート剤が印刷される。本発明者は、真っ新な原紙の片面に多量の含水成分が供給されると、印刷中に含水成分が原紙から反対面に染み出し、フレキソ多色印刷機２１の圧胴２２を汚染する、といった課題を発見した。水性フレキソインクが直に原紙１２の素材すなわち紙帯３５に供給されると、水性フレキソインクの含水成分が紙帯３５の反対面から染み出すといった課題も発見された。前述の包装紙１１、１１ａ～１１ｅの製造にあたって原紙１２の表面１２ａまたは裏面１２ｂのどちらから印刷が実施されても、印刷中に原紙１２に水分が染み出してフレキソ多色印刷機２１の圧胴２２は汚染されることがない。 As described above, the wrapping paper 11, 11a to 11e uses the flexible and thin base paper 12. A water-based flexographic ink, a water-repellent coating agent, and an oil-resistant coating agent are printed on the raw material of the base paper 12, that is, the paper band 35, by water-based flexographic printing. When a large amount of a water-containing component is supplied to one side of a fresh base paper, the inventor exudes a water-containing component from the base paper to the opposite side during printing, and contaminates the impression cylinder 22 of the flexo multicolor printing machine 21. I found a problem. It has also been discovered that when the water-based flexographic ink is directly supplied to the material of the base paper 12, that is, the paper strip 35, the water-containing component of the water-based flexographic ink oozes out from the opposite surface of the paper strip 35. Regardless of whether printing is performed from the front surface 12a or the back surface 12b of the base paper 12 in the production of the wrapping paper 11, 11a to 11e, moisture exudes to the base paper 12 during printing, and the impression cylinder of the flexo multicolor printing machine 21 22 is not contaminated.
　図１２に示されるように、包装紙１１、１１ａ～１１ｅ、５１は袋型に加工されてもよい。２片の包装紙１１、１１ａ～１１ｅ、５１はともに例えば長方形に形作られる。包装紙１１、１１ａ～１１ｅ、５１は２辺の辺同士で相互に結合される。包装紙１１、１１ａ～１１ｅ、５１同士は耐油コート層１３を有する面同士で向き合う。すなわち、包装紙１１、１１ａ～１１ｅ、５１はハンバーガーといったファーストフードに耐油コート層１３で接触する。ただし、必ずしもこうした位置関係に限定される必要はない。その他、１片の包装紙１１、１１ａ～１１ｅ、５１に代えて透過性の紙片やフィルム片がもう１片の包装紙１１、１１ａ～１１ｅ、５１に結合されてもよい。 As shown in FIG. 12, the wrapping paper 11, 11a to 11e, 51 may be processed into a bag shape. The two pieces of wrapping paper 11, 11a to 11e, 51 are both formed in a rectangular shape, for example. The wrapping papers 11, 11a to 11e, 51 are connected to each other at two sides. The wrapping papers 11, 11a to 11e, 51 face each other on the surfaces having the oil-resistant coating layer 13. That is, the wrapping paper 11, 11a to 11e, 51 comes into contact with a fast food such as a hamburger with the oil-resistant coating layer 13. However, it is not necessarily limited to such a positional relationship. In addition, instead of one piece of the wrapping paper 11, 11a to 11e, 51, a transparent paper piece or a film piece may be bonded to the other piece of wrapping paper 11, 11a to 11e, 51.

Claims (9)

  1. 　原紙と、
    　前記原紙に積層される耐油コート層、インク印刷層および撥水コート層と、
    を有し、
    　前記原紙の第１面に、水性フレキソ印刷により前記耐油コート層のみが形成され、
    　前記原紙の前記第１面の裏側の第２面に、水性フレキソ印刷により前記撥水コート層および前記インク印刷層が順番に形成されている
    ことを特徴とするファーストフード用包装材。     With the base paper,
    An oil-resistant coating layer, an ink printing layer and a water-repellent coating layer laminated on the base paper,
    Have
    Only the oil-resistant coating layer is formed on the first surface of the base paper by aqueous flexographic printing,
    A fast food packaging material, wherein the water-repellent coating layer and the ink printing layer are sequentially formed by water-based flexographic printing on a second surface on the back side of the first surface of the base paper.
  2. 　請求項１において、
    　前記原紙の前記第２面と前記撥水コート層との間に挟み込まれる第２の耐油コート層をさらに有する
    ことを特徴とするファーストフード用包装材。     In claim 1,
    A fast food packaging material, further comprising a second oil-resistant coating layer sandwiched between the second surface of the base paper and the water-repellent coating layer.
  3. 　請求項１または２において、
    　前記インク印刷層を覆う第２の撥水コート層をさらに有する
    ことを特徴とするファーストフード用包装材。     In claim 1 or 2,
    A fast food packaging material further comprising a second water-repellent coating layer covering the ink print layer.
  4. 　原紙と、
    　前記原紙に積層される第１耐油コート層、第２耐油コート層およびインク印刷層と、
    を有し、
    　前記原紙の第１面に、水性フレキソ印刷により前記第１耐油コート層のみが形成され、
    　前記原紙の前記第１面の裏側の第２面に、水性フレキソ印刷により第２耐油コート層および前記インク印刷層が順番に形成されている
    ことを特徴とするファーストフード用包装材。     With the base paper,
    A first oil-resistant coating layer, a second oil-resistant coating layer and an ink printing layer laminated on the base paper;
    Have
    Only the first oil-resistant coating layer is formed on the first surface of the base paper by aqueous flexographic printing,
    A fast food packaging material, wherein a second oil-resistant coating layer and the ink printing layer are sequentially formed by water-based flexographic printing on a second surface on the back side of the first surface of the base paper.
  5. 　請求項４において、
    　前記インク印刷層の両面の少なくとも一方の面を覆う撥水コート層をさらに有する
    ことを特徴とするファーストフード用包装材。     In claim 4,
    A fast food packaging material further comprising a water repellent coating layer covering at least one surface of both sides of the ink print layer.
  6. 　原紙の第１面に水性フレキソ印刷によりパーフロオロポリエーテル誘導体を含む耐油コート剤を塗工する工程と、
    　前記原紙の前記第１面の裏側の第２面に水性フレキソ印刷によりワックスエマルジョンを含む撥水コート剤を塗工する工程と、
    を備えることを特徴とするファーストフード用包装材の製造方法。     Applying an oil-resistant coating agent containing a perfluoropolyether derivative to the first surface of the base paper by aqueous flexographic printing;
    Applying a water-repellent coating agent containing a wax emulsion to the second surface on the back side of the first surface of the base paper by aqueous flexographic printing;
    A method for producing a packaging material for fast food, comprising:
  7. 　原紙と、
    　前記原紙の第１面に水性フレキソ印刷により形成されて、所定の通気性を有する１層の第１耐油コート層と、
    　前記原紙の前記第１面の裏側の第２面に水性フレキソ印刷により形成されるインク印刷層と、
    　前記原紙の前記第２面に水性フレキソ印刷により形成されて、所定の通気性を有しつつ前記第１耐油コート層との間に前記原紙を挟み込むことで前記第１耐油コート層および前記原紙と協働で所定の耐油性能を発揮する１層の第２耐油コート層と
    を備えることを特徴とするファーストフード用包装材。     With the base paper,
    A first oil-resistant coating layer formed by water-based flexographic printing on the first surface of the base paper and having a predetermined air permeability;
    An ink printing layer formed by water-based flexographic printing on a second surface on the back side of the first surface of the base paper;
    The first oil-resistant coating layer and the base paper are formed by water-based flexographic printing on the second surface of the base paper and sandwiching the base paper with the first oil-resistant coating layer while having a predetermined air permeability. A fast food packaging material comprising a second oil-resistant coating layer that exhibits a predetermined oil-resistant performance in cooperation.
  8. 　請求項７において、
    前記第１耐油コート層および前記第２耐油コート層はアクリル系エマルジョンおよびパーフロオロポリエーテル誘導体を含むことを特徴とするファーストフード用包装材。     In claim 7,
    The first oil-resistant coat layer and the second oil-resistant coat layer contain an acrylic emulsion and a perfluoropolyether derivative.
  9. 　請求項７または８において、
    　前記インク印刷層は、前記原紙の前記第２面に直接に積層され、前記第２耐油コート層で覆われることを特徴とするファーストフード用包装材。     In claim 7 or 8,
    The fast food packaging material, wherein the ink printing layer is directly laminated on the second surface of the base paper and covered with the second oil-resistant coating layer.
PCT/JP2011/080234 2010-12-28 2011-12-27 Fast food packaging material and production method for same WO2012091022A1 (en)

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