EP0428057A2 - Procédé pour la production de papier couché à haut brillant - Google Patents

Procédé pour la production de papier couché à haut brillant Download PDF

Info

Publication number
EP0428057A2
EP0428057A2 EP90121338A EP90121338A EP0428057A2 EP 0428057 A2 EP0428057 A2 EP 0428057A2 EP 90121338 A EP90121338 A EP 90121338A EP 90121338 A EP90121338 A EP 90121338A EP 0428057 A2 EP0428057 A2 EP 0428057A2
Authority
EP
European Patent Office
Prior art keywords
drum
pigment coating
cast
coating layer
highly polished
Prior art date
Legal status (The legal status 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 status listed.)
Granted
Application number
EP90121338A
Other languages
German (de)
English (en)
Other versions
EP0428057A3 (en
EP0428057B1 (fr
Inventor
Ryuya Numaguchi
Hideo Shikano
Shigeki Komatu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Kakoh Seishi KK
Original Assignee
Nippon Kakoh Seishi KK
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.)
Filing date
Publication date
Application filed by Nippon Kakoh Seishi KK filed Critical Nippon Kakoh Seishi KK
Publication of EP0428057A2 publication Critical patent/EP0428057A2/fr
Publication of EP0428057A3 publication Critical patent/EP0428057A3/en
Application granted granted Critical
Publication of EP0428057B1 publication Critical patent/EP0428057B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00—Other accessories for paper-making machines
    • D21G9/009—Apparatus for glaze-coating paper webs

Definitions

  • the present invention relates to a process for produc­ing cast-coated papers. More particularly, this invention relates to a process for producing cast-coated papers that have high degrees of gloss and smoothness, that are free from surface imperfections such as low surface strength and problems caused by uneven adhesion between the base paper and the cast-coated layer, and that have improved resistance to curling and other undesirable qualities affecting paper.
  • cast-coated papers permit printing to be performed with consistent results, so they are suitable for precise and high-grade printing operations and are extensively used in artistic printed matter, high-quality catalogs, the front covers of magazines, labels, wrapping papers, etc.
  • Cast-coated papers are conventionally produced by a process that comprises applying an aqueous pigment coating (i.e., a composition that contains a pigment and an adhesive as main components) onto the surface of a base paper to form a pigment coating layer, which is then pressed and dried in contact with a heated, highly polished metal drum.
  • an aqueous pigment coating i.e., a composition that contains a pigment and an adhesive as main components
  • a wet (direct) method a gelation (coagulation) method and a re-wet (indirect) method in accordance with the manner in which the pigment coating layer is pressed and dried in contact with the heated, highly polished metal drum to obtain a cast-coated paper with a glossy surface.
  • the pigment coating layer is pressed and dried in contact with the heated metal drum while it is still in a wet and plasticized state.
  • the gelation method the pigment coating layer is passed through a coagulating bath so that it gels and becomes plasticized before it is pressed and dried in contact with the heated metal drum.
  • the pigment coating layer is first dried, then optionally supercalendered, and thereafter re-wetted with a wetting solution to be rendered plasticized so that it can be pressed and dried in contact with the heated metal drum to give a glossy surface.
  • the three basic processes for producing cast-coated papers share the common feature that the pigment coating layer, while it is in a plasticized state, is pressed and dried in contact with a heated, highly polished drum. Hence, the water in the pigment coating layer partly evapo­rates through the base paper and partly through the pigment coating layer toward the drum surface. If the rate of water evaporation exceeds a certain level, pinholes will develop in the surface of the cast-coated layer and the resulting cast-coated paper is no longer suitable for use in printed matter. In other words, the rate of production of cast-­coated papers is reduced.
  • the surface of the pigment coating layer is subjected to rapid heating and evaporation, blisters will form and part or all of the pigment coating layer will adhere onto the highly polished drum surface to make subsequent casting operations impossible.
  • the pigment coating layer is fed onto the drum surface while it is at low temperature, insufficient drying and cast-coated paper release often causes such problems as lifting of the pigment coated surface, picking and failure to achieve a satisfactory gloss due to poor casting. Even if the temperature conditions are maintained within an appropriate range, the highly polished drum surface becomes stained over time and the resulting decrease in paper release quality will in many cases cause imperfections in the surface of the cast layer such as loss of gloss and picking.
  • the present invention relates to an improvement of a process for producing a cast-coated paper that comprises the basic steps of: applying onto the surface of a base paper an aqueous pigment coating that contains a pigment and an adhesive as main components, whereby a pigment coating layer is formed; pressing the pigment coating layer onto a heated, highly polished metal drum; and drying said pigment coating layer in contact with the heated drum.
  • the improvement comprises a two-stage process in which subsequent to the first stage of treatment with a highly polished drum which consists of pressing the pigment coating layer, while it is in a plasticized state, onto the heated, highly polished metal drum and drying said pigment coating layer in contact with the drum, the dried pigment coating layer is subjected to the second stage of treatment with a highly polished drum in which it is re-wetted with a re-wetting solution, pressed onto a heated, highly polished metal drum, and dried in contact with the drum.
  • the present inventors conducted intensive studies to overcome these difficulties and found that by finishing a cast-coated layer to a high gloss under mild conditions through a two-stage treatment with a highly polished drum, high degrees of gloss and smoothness could be retained and surface imperfections such as low surface strength and uneven adhesion between the base paper and the cast-coated layer could be eliminated and yet improved resistance to curling and surface waviness could be achieved.
  • the present invention has been accomplished on the basis of this finding.
  • the first stage of treatment with a highly polished drum can be carried out with marked results whether it is by the wet (direct) method, the gelation (coagulation) method or the re-wet (indirect) method.
  • the aqueous pigment coating that is used to provide a cast-coated layer on the surface of a base paper may be of any type commonly used in the art to provide aqueous pigment coating on paper.
  • the main components of this aqueous pigment coating are a pigment and an adhesive and it may optionally contain suitable additives including release agents, colorants, defoamers, viscosity modifiers, water-­proofing agents, etc. as required.
  • Suitable pigments include clays, kaolin, aluminum hydroxide, calcium carbonate, titanium oxide, barium sulfate, satin white and various plastic pigments.
  • Suitable adhesives include synthetic resin latices such as styrene-­butadiene latex, methyl methacrylate-butadiene latex and styrene-vinyl acetate latex, as well as water-soluble adhesives such as casein, soybean protein, oxidized starches, modified starches and polyvinyl alcohol. These adhesives are incorporated in amounts ranging from 15 to 35 parts by weight per 100 parts by weight of the pigment.
  • additives such as release agents, colorants, defoamers, viscosity modifiers and waterproofing agents may be incorporated in the aqueous pigment coating.
  • the aqueous pigment coating that contains a pigment and an adhesive as main components and which optionally contains suitable additives to a solids content of 40 - 70% is applied onto the surface of a base paper (basis weight, 40 - 350 g/m2) to give a coat weight of 10 - 30 g/m2 with a suitable apparatus such as an air-knife coater, a blade coater, a roll coater or a rod coater.
  • a suitable apparatus such as an air-knife coater, a blade coater, a roll coater or a rod coater.
  • the pigment coating layer thus provided on the surface of the base paper is subjected to the first stage of treatment with a highly polished drum in which it is pressed onto a highly polished metal drum surface and dried in contact therewith by either the wet method, gelation method or the re-wet method.
  • the pigment coat­ing layer on the surface of the base paper is treated in a wet state.
  • the coating layer is first coagulated with a gelling agent while it is wet or half-dry before it is subjected to the first stage of treat­ment with a highly polished drum.
  • the coating layer is dried with hot air at 100 - 180°C, option­ally smoothed with a supercalender, a gloss calender, a thermoplanisher, a soft calender or by some other means of surface treatment, re-wetted with a re-wetting solution to become plasticized, and subjected to the first stage of treatment with a highly polished drum in which the coating layer is pressed onto a heated (80 - 150°C) highly polished drum and dried in contact therewith.
  • the coating layer is wetted once again with a re-wetting solution so that it is rendered plasticized, and thereafter subjected to the second stage of treatment with a highly polished drum in which it is pressed onto a heated highly polished drum and dried in contact therewith, whereby a cast-coated paper is obtained that retains a highly glossy and smooth surface, that is free from surface imperfections such as low surface strength and uneven adhesion between the base paper and the cast-coated layer, and that is improved in resistance to curling and surface waviness.
  • the re-wetting solution that can be used in the present invention is water that may contain a dispersant such as sodium hexametaphosphate, sodium tripolyphostate, sodium pyrophosphate or sodium polyacrylate or a release agent such as sodium stearate, ammonium stearate, calcium stearate, sodium oleate, ammonium oleate, calcium oleate, microcrystalline wax, polyethylene emulsion or stearic acid emulsion.
  • a dispersant such as sodium hexametaphosphate, sodium tripolyphostate, sodium pyrophosphate or sodium polyacrylate
  • a release agent such as sodium stearate, ammonium stearate, calcium stearate, sodium oleate, ammonium oleate, calcium oleate, microcrystalline wax, polyethylene emulsion or stearic acid emulsion.
  • organic carboxylic acids such as formic acid, citric acid and succinic acid, a variety of surfactants, sulfated oils and other additives may be incorporated in the re-wetting solu­tion as in the usual practice of the re-wet casting method.
  • Example 1 Recipe for cast-coated layer Parts by weight Kaolin 100 Sodium polyacrylate 0.7 Casein 15 Styrene-butadiene latex 15 Calcium stearate 0.2
  • Example 2 Recipe I for cast-coated paper Parts by weight Kaolin 60 Precipitated calcium carbonate 40 Sodium polyacrylate 0.7 Casein 6 Styrene-butadiene latex 18 Polyethylene emulsion 0.5 Recipe II for re-wetting solution Parts by weight Water 100 Polyethylene emulsion 0.5 Succinic acid 0.2
  • Example 3 Recipe III for cast-coated prime layer Parts by weight Kaolin 80 Precipitated calcium carbonate 20 Sodium polyacrylate 0.15 Modified starch 10 Styrene-butadiene latex 10 Calcium stearate 0.5 Recipe IV for cast-coated top layer Parts by weight Kaolin 90 Precipitated calcium carbonate 10 Sodium polyacrylate 0.15 Casein 8 Styrene-butadiene latex 14 Calcium stearate 0.3
  • An aqueous pigment coating (solids cont. 45%) was prepared to the recipe used in Example 1, applied onto a base paper having a basis weight of 107 g/m2, and subsequently treated as in Example 1 to obtain a cast-coated paper in accordance with the present invention.
  • a comparative cast-coated paper was produced by a method which employed the same conditions as in Example 1 up to the first stage of treatment with a highly polished drum.
  • Another comparative cast-coated paper was produced by a method which employed the same conditions as in Example 2 up to the first stage of treatment with a highly polished drum.
  • Another comparative cast-coated paper was produced by a method which employed the same conditions as in Example 3 up to the first stage of treatment with a highly polished drum.
  • Still another comparative cast-coated paper was produced by a method which employed the same conditions as in Example 4 up to the first stage of treatment with a highly polished drum.
  • the two-stage treatment with a highly polished drum per­formed in accordance with the present invention enables efficient production of cast-coated papers that retain the high degrees of gloss and smoothness which are characteris­tic of cast-coated papers, that are free from such surface imperfections as low surface strength and uneven adhesion between the base paper and the cast-coated layer, and that have a sufficiently high water content to provide improved resistance to curling and surface waviness.

Landscapes

  • Paper (AREA)
EP19900121338 1989-11-09 1990-11-07 Procédé pour la production de papier couché à haut brillant Expired - Lifetime EP0428057B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP28995489A JPH03152293A (ja) 1989-11-09 1989-11-09 キヤストコート紙の製造法
JP289954/89 1989-11-09

Publications (3)

Publication Number Publication Date
EP0428057A2 true EP0428057A2 (fr) 1991-05-22
EP0428057A3 EP0428057A3 (en) 1991-10-23
EP0428057B1 EP0428057B1 (fr) 1996-06-26

Family

ID=17749886

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19900121338 Expired - Lifetime EP0428057B1 (fr) 1989-11-09 1990-11-07 Procédé pour la production de papier couché à haut brillant

Country Status (4)

Country Link
EP (1) EP0428057B1 (fr)
JP (1) JPH03152293A (fr)
DE (1) DE69027575T2 (fr)
ES (1) ES2091216T3 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5895542A (en) * 1994-11-23 1999-04-20 Appleton Papers Incorporated Coater and a method for coating a substrate
EP1739231A1 (fr) * 2005-07-02 2007-01-03 M-real Oyj Dispositif de couchage au glacis
US8202624B2 (en) 2006-05-23 2012-06-19 M-Real Oyj Coated papers having improved labelling properties
CN111648158A (zh) * 2020-05-29 2020-09-11 玖龙纸业（太仓）有限公司 一种造纸用剥离剂去除胶粘物粘性效果的评价方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4742163B2 (ja) * 2009-07-24 2011-08-10 北越紀州製紙株式会社 キャストコート紙の製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952388A1 (de) * 1978-12-27 1980-07-03 Mitsubishi Paper Mills Ltd Verfahren und vorrichtung zur oberflaechenbehandlung von beschichteten papieren
EP0120095A1 (fr) * 1982-09-28 1984-10-03 Kanzaki Paper Manufacturing Company Limited Procede de fabrication de papier coule-revetu
EP0396095A2 (fr) * 1989-05-02 1990-11-07 Nippon Kakoh Seishi K.K. Procédé de fabrication de papier couché à haut brillant

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2952388A1 (de) * 1978-12-27 1980-07-03 Mitsubishi Paper Mills Ltd Verfahren und vorrichtung zur oberflaechenbehandlung von beschichteten papieren
EP0120095A1 (fr) * 1982-09-28 1984-10-03 Kanzaki Paper Manufacturing Company Limited Procede de fabrication de papier coule-revetu
EP0396095A2 (fr) * 1989-05-02 1990-11-07 Nippon Kakoh Seishi K.K. Procédé de fabrication de papier couché à haut brillant

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5895542A (en) * 1994-11-23 1999-04-20 Appleton Papers Incorporated Coater and a method for coating a substrate
EP1739231A1 (fr) * 2005-07-02 2007-01-03 M-real Oyj Dispositif de couchage au glacis
WO2007003272A1 (fr) * 2005-07-02 2007-01-11 M-Real Oyj Dispositif de couchage super-brillant
US8202624B2 (en) 2006-05-23 2012-06-19 M-Real Oyj Coated papers having improved labelling properties
CN111648158A (zh) * 2020-05-29 2020-09-11 玖龙纸业（太仓）有限公司 一种造纸用剥离剂去除胶粘物粘性效果的评价方法

Also Published As

Publication number Publication date
DE69027575D1 (de) 1996-08-01
ES2091216T3 (es) 1996-11-01
EP0428057A3 (en) 1991-10-23
DE69027575T2 (de) 1997-02-13
EP0428057B1 (fr) 1996-06-26
JPH03152293A (ja) 1991-06-28

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