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
  • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
• • 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
  • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
  • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
  • D21H25/12—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod
  • D21H25/14—Rearranging applied substances, e.g. metering, smoothing; Removing excess material with an essentially cylindrical body, e.g. roll or rod the body being a casting drum, a heated roll or a calender

Definitions

• the present invention relates to an easy casting method for cast-coated paper, and more particularly, to a method for forming a cast-coated paper by using a cast method or a gel cast method.
• the present invention relates to a method for forming a glossy cast coating ⁇ without S by S speed.
• the S-coating method for high-gloss coated paper for mark 81 involves pressing an SS coating layer containing tt substance pigment and adhesive as its main component on an aged surface having a ⁇ surface.
• Etch casting method 51 ⁇ ⁇ JP ⁇ 28-3407, JP K 38-25160
• S «Re-V-casting method in which the surface is heated and pressed against a heated surface
• the gel casting method in which the surface is aged and pressed with a matte surface for example, Japanese Patent Publication No. 33-15751, Japanese Patent Publication No. 40-7207, US Patent No. 3377192, Japanese Patent Application Laid-Open No. 51-40404, No. 57-5U96 is known.
• the drum a degree is set to 90 or more.
• U.S. Patent No. 231 6202 has a packing roll.
• the paper pressure is used to prevent the transfer of moisture to the paper.
• the coating before being pressed against the drum is once dried or gelled, even if pressed under high pressure on a drum with a pressure of 90 or more, the coating will be destroyed as in the V-cast method. None. For this reason, it is expected that high-quality cast paintings will be completed in 3 ⁇ 4 speed.
• the cast coated paper obtained by the high-temperature, pressure-casting method has a bell-shape from the mirror-surface drum, and has a high gloss, but the outside of the high-gloss cast-finished surface, ( ⁇ Coated surface or coated paper finished surface) inside, the curl with the paper width direction set to ⁇ , so-called reverse vertical curl may occur.
• the reverse wales curl recently Tomini have One Do greatly disturbing cause the workability of hitting the Shirushi ⁇ cause ShiPa brushwood feeding trouble multicolored indicia 81 machine which has been faster ⁇
• the fibers on the wet coated side, BP or cast-finished surface are cut off more than those on the back surface.
• the ironing action is caused by the high pressure of the press roll in a state in which the water-containing slope is generated, it is conceivable that the fibers on the cast-finished surface side are further stretched and the reverse vertical curl is promoted.
• the present inventors have found that the reverse vertical curl phenomenon, which has been conventionally desired to be improved, is a deficiency of high temperature and high pressure casting methods such as the Riu Ito casting method.
• the coating layer mainly composed of a filler and an adhesive is gelled or dried, then re-ripened, ripened, and pressed against a drum surface having an fc ⁇ surface to give a high gloss finish.
• a method for producing cast coated paper characterized in that the coated nip is pressed against the surface of the drum, or the back of the tongue is sterilized in front of the press nip. It is.
• the coating composition used for forming the coating composition includes a coating composition mainly composed of a pigment and an adhesive, similarly to the conventional casting composition.
• the pigments include coatings such as clay, virgin phosphorus, water »aluminum oxide, calcium carbonate, titanium oxide, iso-K palladium, zinc oxide powder, sachin white, plastic pigment, etc.
• the adhesion proteins include casein, soybean protein, methasul, and the like, proteins extracted from sporulating bacterial cells.
• O PI Proteins such as white Styrene / butadiene copolymer, methyl methacrylate / butadiene copolymer, etc.
• Conjugated gen-based polymer latex, acrylic! ! Acrylic polymer latex such as polymer and copolymer of ester and / or methacrylic ester, vinyl polymer latex such as ethylene / S »vinyl copolymer, or various kinds of these
• the combined polymer is modified with a functional group containing a monomer such as a carboxyl group to form an fc-soluble or alkaline-soluble polymer latex, polyvinyl alcohol, off-line, anhydrous male » «»,
• Synthetic adhesives such as melamine tree oba, etc.
• the adhesive for coated paper of 3 ⁇ 41 is used alone or in combination a. These adhesives are used in the range of 5 to 50 parts by weight per part by weight of the material, initially 10 to 30 parts by weight, Also defoamer, coloring sho, female type, flow Various additives such as a modifier are used as needed.
• the coating composition is as follows: a plate coater, a Jaynaif coater, a black coater, a brush coater, a curtain coater, a champlets cusco coater, a per coater used in the production of coated paper of 1 ⁇ . It is coated on paper at a time by an off-machine or off-man thin coater equipped with an applicator such as a gravure coater or size press coater. At that time, the solid content of the coating composition was 40
• the base paper is used for general printing coated paper and cast coated paper.
• coated paper It can be used as coated paper or base paper with a coating.
• the coating amount of the coating material on such an original » is about 10 to 50 3 / ai on a dry weight basis.
• the coating formed on the base paper is similar to that of the conventional method.
• Release agents such as microcrystalline wax, surfactants, and roast oil
• Aqueous solution containing about 0.01 to 3 times 6 and emulsion, etc. are preferably used.
• water used for the purpose of improving the water surface of paper, improving the size 31 properties, improving the strength, improving the universality of stamped steel, coloring, etc. is used for magic powders, proteins, waxes, etc.
• an aqueous solution of a sizing agent, a synthetic tendon, a dye, a surface active agent, a pigment, or the like may be used.
• a dryer or the like to check the water level in order to prevent the paper strength from dropping. Drying needs to be 3 »so that the water volume is not less than 1.
• the heating drum used in the present invention is simply described.
• the diameter of the heating drum is generally about 1,000 to 5,000, but a drum having a diameter of about 1,200 to 3, ⁇ 00 mm is preferable from the viewpoint of operation.
• the drum surface density can be used at 90 or more per fi, but considering the paper a poorness and operability, the range of ⁇ ⁇ is desirable.
• a press roll for pressing the coating on the drum It is desirable to use a rubber-coated roll having a roll diameter of 200 to 1,500, more preferably about 300 to 900, and a press roll pressure of about 30 to 350 for pressing the coated paper. More preferably, it should be reduced to about 80 to 25001.
• the press nip or humidifying the back surface in front of the press nip is performed in a high-humidity, high-pressure cast method such as a re-cast casting method or a gelling casting method. Even if the casting speed is 50 mZ or more, the reverse vertical coloring and the good high gloss coating without irritations are always stable even if the casting speed is increased to 50 mZ or more. It is obtained by doing.
• FIG. 1 and FIG. 2 are skeleton cross-sectional views of a cast finishing device used in the present invention and a comparative example.
• This delirium solution had a pH of 9.5 and a viscosity of 360 CPS (pull
• the coating liquid is coated with an air knife coater 2 and an air foil dryer
• step 3 the paper was dried so that the paper moisture became 6%.
• step 3 a 750 mm diameter ball
• the paper is passed through the press nip 6 formed by the drum 5 and supplied from the nozzle 7.
• the coat is rewet and cast with a press nip pressure of 150 and Zc
• the stripped cast coated paper was rolled up as roll-up 9.
• Example 6 In order to humidify the back surface of the «before step 6, use a heating device c consisting of a plain roll, a big roll-up (clear roll clearance-0.2 recommended), and a water ball. In Example 6, S was applied using both spray a and humidification c. On the other hand, in Comparative Example 11, no humidification was performed on the back side of the paper. In Comparative Example 2, a 225 mesh gravure roll, a big-up roll, and a water pool were used. In comparison «13, which passed through the press nip 6, « from the plain pool and the big roll (clearance of Roll H-0.2 ⁇ ) and the water pool Humidification with a humidifier d.
• the pH was 9.0 on a Brookfield viscometer, 60 rp fiber, 20.
• a gel casting was performed using the coating liquid by the apparatus a shown in FIG. 2, that is, the above coating liquid was dried on a base of 90 sq.m. Coated with a roll coater 12, followed by a 0.596 gK aqueous solution 13
• a spray 17 sprays a 0.5% concentration
• the resulting cast coating has no reverse vertical curls.
• Example 4 was used as Comparative Example 4.

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• 1982
  • 1982-09-28 JP JP57170774A patent/JPS5959995A/ja active Granted
• 1983
  • 1983-09-26 AU AU20340/83A patent/AU558070B2/en not_active Ceased
  • 1983-09-26 WO PCT/JP1983/000316 patent/WO1984001396A1/ja not_active Ceased
  • 1983-09-26 EP EP83903009A patent/EP0120095B1/en not_active Expired
  • 1983-09-26 US US06/619,148 patent/US4581257A/en not_active Expired - Lifetime
  • 1983-09-26 DE DE8383903009T patent/DE3382502D1/de not_active Expired - Lifetime

Non-Patent Citations (1)

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