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
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/38—Coatings with pigments characterised by the pigments
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/38—Coatings with pigments characterised by the pigments
  • D21H19/385—Oxides, hydroxides or carbonates
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/38—Coatings with pigments characterised by the pigments
  • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
  • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/80—Paper comprising more than one coating
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/80—Paper comprising more than one coating
  • D21H19/84—Paper comprising more than one coating on both sides of the substrate
• • 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
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
  • D21H19/50—Proteins
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/36—Coatings with pigments
  • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
  • D21H19/54—Starch
• • 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
  • D21H19/00—Coated paper; Coating material
  • D21H19/66—Coatings characterised by a special visual effect, e.g. patterned, textured
• • 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
  • D21H21/50—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 form
  • D21H21/52—Additives of definite length or shape
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/25—Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles

Definitions

• the present invention relates to a cast coated paper having good printability because it maintains excellent coating suitability and an appropriate coefficient of friction, and also has an excellent air cleaning effect.
• Titanium oxide is attracting attention as the demand for removing harmful substances in daily life such as offensive odors has increased with increasing interest in the living environment. Titanium oxide has traditionally been used as a pigment with excellent opacity and whiteness for papermaking, but fine titanium oxide uses light energy to cause an oxidation-reduction reaction, and to eliminate various harmful substances in the air. It is known to break down, and development is underway to carry it on paper to take advantage of this phenomenon.
• a photocatalytic paper in which a water-soluble polymer and a substance having a photocatalytic action such as titanium oxide are internally added to paper has been disclosed (see Patent Document 1). In order to demonstrate this, the method of having a photocatalytic substance inside the paper layer is not efficient, but is not sufficient.
• a printed sheet in which a titanium oxide fine powder is bonded to an inorganic binder such as silica sol and a coating in which the surroundings are bonded with an organic adhesive is applied (see Patent Documents 2 and 3).
• a titanium oxide / silica sol mixed coating was applied, the viscosity of the coating having a small particle size of titanium oxide and silica sol significantly increased, and the coating suitability was poor.
• the coverage with the coating was insufficient, and there were problems of poor quality such as high blank paper glossiness, printing glossiness, printing surface feeling, and surface strength.
• Patent Document 1 JP-A-10-226983
• Patent Document 2 JP 2000-129595 A
• Patent Document 3 Japanese Patent Laid-Open No. 11-117196
• an object of the present invention is to provide a cast coated paper that has excellent coated paper quality and printability, and also has an action of decomposing harmful substances when exposed to light. There is to serve.
• the present inventors have provided a cast coating layer mainly composed of a pigment and an adhesive on the base paper, and heated the cast coating layer in a wet state.
• the cast coating layer contains titanium oxide with an average secondary particle size of 300 nm to 2000 nm per 100 parts by weight of pigment:! To 30 parts by weight
• cast coated paper can be obtained that has a high printing glossiness of the printed matter, a good printing surface feeling, etc., and also has the action of decomposing harmful substances and odor components when exposed to light. It was.
• the copolymer latex preferably has a glass transition temperature of 120 to 40 ° C.
• the titanium oxide is mixed with silica sol or alumina sol, and the titanium oxide: silica sol or alumina sol is mixed at a mixing ratio of 2: 1 to 1: 2, so that the deterioration of the paper due to the photocatalytic decomposition reaction, It is possible to produce cast coated paper that further suppresses deterioration in print quality due to decomposition or the like and has good printability.
• the invention's effect is to produce cast coated paper that further suppresses deterioration in print quality due to decomposition or the like and has good printability.
• the present invention has a high white paper glossiness peculiar to cast coated paper, good printing quality such as printing glossiness, printing surface feeling, surface strength, etc., and is good because it maintains an appropriate coefficient of friction. It is possible to obtain cast coated paper that has good printability and also has the effect of decomposing harmful substances when exposed to light.
• a part of the pigment blended in the coating liquid has fine particles having a photocatalytic performance with an average secondary particle diameter of 300 to 2000 nm. It is important to use titanium oxide at a specific blending ratio, preferably 500-1500 nm, more preferably 700-1300 nm. Titanium oxide itself has photocatalytic performance regardless of particle size. If the average particle size of the secondary particles is less than 300 nm, the dispersibility of the titanium oxide slurry decreases and the viscosity of the paint becomes extremely high, resulting in a decrease in productivity and print quality and printing workability due to lack of titanium oxide. , The photocatalytic function decreases.
• the primary particle size of titanium oxide is preferably 5 to 100 nm, more preferably 10 to 50 nm, and still more preferably 10 to 35 nm. If the primary particle size is less than 5 nm, the dispersibility of the titanium oxide slurry and the fluidity of the paint will decrease, and the print quality and workability will tend to be poor. If it exceeds lOOnm, the surface area becomes small, so photocatalytic performance tends to be insufficient.
• Fine titanium oxide can have the ability to decompose harmful substances in the air when exposed to light.
• the compounding ratio of titanium oxide is 1 to 30 parts by weight out of 100 parts by weight of the pigment, preferably 5 to 25 parts by weight, and more preferably 5 to 20 parts by weight.
• Titanium oxide compounding rate Force If the amount is less than 1 part by weight, the amount of photocatalyst is too small to obtain a sufficient air cleaning effect.
• the fine titanium oxide has a very low slurry concentration when slurried for use in paints having very poor fluidity. Become.
• titanium oxide in the present invention includes all titanium oxides or hydroxides called hydrous titanium oxide, hydrated titanium oxide, metatitanic acid, orthotitanic acid, and titanium hydroxide. Can be manufactured.
• a visible light responsive photocatalyst that responds to light in the visible light region and exhibits a photocatalytic effect can also be used.
• the titanium oxide used in the present invention preferably has a specific surface area of 10 to 350 m 2 Zg.
• the titanium oxide of the present invention mixes silica sol or alumina zonole with titanium oxide, so that the surrounding of fine titanium oxide is coated with silica zonole or alumina sol having an inorganic adhesion function. It is possible to further suppress a decrease in print quality due to component decomposition and the like.
• the mixing ratio of titanium oxide and silica sol or alumina sol inorganic adhesive is in the range of 5 ::! To 1: 5 in the polymerization ratio, and the range of 2: 1 to 1: 2 in the polymerization ratio is preferred. More preferably, it is 2: 1 to: 1: 1.5. If the ratio of titanium oxide is higher than 5: 1, it tends to cause deterioration of the paper due to decomposition of the organic adhesive and pulp fibers in the paint, or deterioration of print quality due to decomposition of the ink components of the printed matter. If the ratio of titanium oxide is too lower than 1: 5, the coefficient of static friction of the paper will increase significantly, causing paper jam problems due to double feeding during printing, and the printing workability tends to be inferior.
• a silica sol from the point of light transmittance.
• titanium oxide and silica or colloidal solution of alumina are mixed at a certain ratio, stirred for a certain period of time, and then other pigments and auxiliaries are added. It is preferable to add it.
• a mixture of silica sol and alumina sol inorganic adhesive can be mixed with titanium oxide.
• cast coated paper When cast coated paper is used in a carton, it has a high white paper gloss and is capable of producing a high-quality thin paper carton. During carton processing, the surface of the cast coated paper is rubbed and scratched. Problems may occur. In this case, it is preferable to contain 5 parts by weight or more of the above-mentioned silica zonole with respect to 100 parts by weight of the pigment, and more preferably 5 to 50 parts by weight improves the scratch on the thin paper carton. This is the final product thin leaf It is important for enhancing the cosmetics of the paper box.
• the mixing ratio of titanium oxide and silica sol or alumina sol inorganic adhesive is 5 ::! ⁇
• the ratio is in the range of 1: 5, and the polymerization ratio is more preferably in the range of 2: 1 :! to 1: 2 and more preferably 2: 1 to 1: 1.5.
• other pigments provided in the cast coating layer include kaolin, clay, delaminated clay, heavy calcium carbonate, light calcium carbonate, talc, titanium dioxide, which are conventionally used in coated paper production.
• Inorganic pigments such as barium sulfate, calcium sulfate, zinc oxide, caustic acid, silicate, colloidal silica, and satin white, and organic pigments such as plastic pigment can be selected and used as necessary.
• kaolin in terms of the photocatalytic effect, white paper surface feeling, and white paper glossiness, and the blending amount is preferably 10 parts by weight or more per 100 parts by weight of the pigment. More preferably, it is 40 parts by weight or more.
• the organic adhesive is 5 to 40 parts by weight, preferably 8 to 40 parts by weight, more preferably 8 to 30 parts by weight, particularly preferably 100 parts by weight of the pigment in the cast coating layer. Is to blend 10-20 parts by weight.
• the organic adhesive is less than 5 parts by weight, sufficient surface strength cannot be obtained, and the carton cacheability tends to be inferior.
• the amount exceeds 40 parts by weight the coating concentration decreases, it becomes difficult to control the coating amount, the drying load increases, the coating speed decreases, and the titanium oxide is used as an adhesive. It is not preferable because it has a disadvantage that the air cleaning effect is reduced. In view of the air cleaning effect, it is preferable that the number of blended parts of the organic adhesive is small.
• styrene-butadiene-based, styrene-acrylic, ethylene-vinyl acetate-based, butadiene-methyl methacrylate, and butyl acetate butyl acrylate are conventionally used for coated paper.
• Synthetic adhesives such as polybutyl alcohol, maleic anhydride copolymer, acrylic acid 'methyl metatalylate copolymer, casein, soy protein, synthetic protein Proteins, oxidized starches, positive starches, etherified starches such as urea phosphate esterified starch, hydroxyethyl etherified starch, starches such as dextrin, carboxy ethenoresenorelose, hydroxyethinoresenorelose or hydroxymethinolol
• One or more organic adhesives such as cellulose derivative adhesives such as senorelose are appropriately selected and used.
• the copolymer latex is preferably contained in an amount of 50 to 90% by weight, more preferably 60 to 90% by weight, more preferably 60 to 90% by weight.
• the copolymer latex is less than 50% by weight, the photocatalytic effect tends to decrease because it is difficult to obtain the high white paper gloss characteristic of cast coated paper. Also, if it exceeds 90% by weight, stickiness to the cast drum will occur and productivity will be reduced.
• the copolymer latex used is preferably a copolymer latex having a glass transition temperature of -20 to 40 ° C, more preferably -20 to 30 ° C, and even more preferably -10 to 30 ° C.
• the glass transition temperature of the shell layer (surface layer) falls within the above temperature range.
• the glass transition temperature of the inner layer is preferably lower than that of the shell layer (surface layer).
• the particle size of the copolymer latex is preferably 50 to 250 nm from the viewpoint of printing quality and surface strength.
• the water-soluble polymer adhesive such as starch is preferably 10 parts by weight or less.
• the cast coating layer contains sodium chloride, ammonium chloride, zinc chloride, magnesium chloride, sodium sulfate, potassium sulfate, ammonium sulfate, and zinc sulfate.
• the Etano Ruamin can be used as appropriate diethylenetriamino ⁇ Min, various additives such as diisopropylamine.
• auxiliary agents such as dispersants, thickeners, water retention agents, antifoaming agents, colorants, mold release agents, flow modifiers, water resistance agents, preservatives, printability improvers, etc.
• auxiliary agents such as dispersants, thickeners, water retention agents, antifoaming agents, colorants, mold release agents, flow modifiers, water resistance agents, preservatives, printability improvers, etc.
• auxiliaries blended in the coating composition for coated paper are appropriately used.
• the base paper for cast coating of the present invention is blended with ordinary pulp, filler and the like.
• the kind of pulp blended in the base paper is not particularly limited.
• hardwood kraft pulp hereinafter referred to as LBKP
• conifer kraft panolep hereinafter referred to as NBKP
• thermo-mechanical pulp groundwood pulp, waste paper pulp and the like are used.
• mechanical pulp is preferred to contain 60% by weight or less of the total pulp because it degrades and discolors when exposed to light when used in large amounts. Most preferred is 100% chemical pulp.
• fillers to be blended in the base paper known fillers such as heavy calcium carbonate, light calcium carbonate, kaolin, clay, talc, hydrated silicic acid, white carbon, titanium oxide, and synthetic resin filler are used. be able to.
• the amount of filler used is about:! To 30% by weight, preferably 3 to 20% by weight, per pulp weight.
• chemicals usually used in the paper making process such as paper strength enhancers, sizing agents, antifoaming agents, colorants, softening agents, bulking agents (low density agents), etc., are used as necessary. As long as the effect is not hindered, it can be added to the stock to make paper.
• the paper making method of the base paper is not particularly limited, and any of the base papers made by acid paper making, neutral paper making, or alkaline paper making using a long net machine, top net machine, etc. including a top wire, etc. Of course, medium base paper including mechanical pulp can also be used. Furthermore, for the purpose of improving the surface strength and sizing properties, a surface treatment agent containing a water-soluble polymer as a main component may be applied to the base paper.
• a surface treatment agent containing a water-soluble polymer as a main component may be applied to the base paper.
• the water-soluble polymer those usually used as surface treatment agents such as oxidized starch, hydroxyethyl etherified starch, enzyme-modified starch, polyacrylamide, and polyvinyl alcohol may be used alone or as a mixture thereof. it can.
• a paper strength enhancer for improving water resistance and improving surface strength and an externally added sizing agent for imparting size can be added to the surface treatment agent.
• Surface treatment agents are applied by coating machines such as two-roll size press coaters, gate roll coaters, blade metering size press coaters, rod metering size press coaters, and film transfer type roll coaters such as shim sizers.
• a base paper coated with a single knife or air knife coater can be used as a base paper for cast coating. Les desirability of about 5 to 30 g / m 2 at a coat weight per side by dry weight of the case. Moreover, it is possible to apply one side and both sides according to a use.
• the wet coating layer for example, various types of dryers such as the above heating cylinder, heated hot air air dryer, gas heater dryer, electric heater dryer, infrared heater dryer and the like are used alone or in combination.
• the degree of drying of the coated paper varies depending on the type of base paper, the type of coating composition, etc., and is generally in the range of about 1 to 10% as paper moisture, and is dried in the range of about 2 to 7%. Is desirable.
• the pre-coated base paper can be subjected to a smoothing process such as a super calendar or a soft calendar beforehand.
• the cast coating base paper a general coated paper, basis weight typically used for coated board it is possible to use 25 ⁇ 600g / m 2 about coating base paper, when coated paper, preferably Is 50 to 200 g / m 2 , and in the case of coated paperboard, 230 to 500 g / m 2 force S is preferred.
• a two-roll size press coater As a method for applying a cast coating composition prepared on a base paper, a two-roll size press coater, a gate roll recorder, a blade metering size press coater, and a rod metering size press coater
• film transfer type roll coaters such as shim sizers, JF sizers and reverse roll coaters, bladed dip / blade coaters, jet fountain / blade coaters, short dwell time application type coaters
• a well-known coater such as a mouth metering coater using a grooved rod, a plain rod, etc., an air knife coater, a curtain coater or a die coater.
• Cast finishing methods include a direct method of casting in a wet state, a solidification method in which a wet coating layer is solidified and cast to finish, and a wet coating layer is once dried and then applied with a rewetting liquid.
• a rewetting method in which the work layer is rewet and cast to finish, but the rewetting method is preferred in terms of the photocatalytic effect.
• the surface temperature of the heated mirror drum is preferably 100 ° C or higher.
• the effect of the present invention is remarkable in a cast coated paper having a high white paper glossiness of 80% or more, preferably 85 to 98%, according to JIS-P8142.
• the coating layer has a dense structure, the contact probability between the photocatalyst blended in the coating layer and harmful components in the air decreases, and the air cleaning effect tends to decrease.
• the production method of the present invention can exhibit an excellent air cleaning effect and high printability even in cast coated paper having high white paper glossiness.
• the thin paper of the present invention includes sanitary paper such as tissue, toilet paper, paper towels, and table napkins, and wipers made of paper or nonwoven fabric.
• the manufacturing method of the thin paper carton is not particularly limited. For example, it is manufactured by the following method.
• the printing and processing of white paperboard is outlined in Pagel67 from Pagel53 of the white paperboard 'paper container' published by Paper Industries Times.
• the base paper carton base paper (coated paper) containing a photocatalyst with a basis weight of 230g / m 2 to 640g / m 2 made by the above method is used to improve the cosmetics when used as a paper paper box for consumers.
• Printing can be mainly done by offset printing by lithographic printing, gravure printing by intaglio, etc.
• UV printing, Sinolec screen printing by stencil, flexographic printing by letterpress, hot stamping that thermocompresses foil film Can be printed.
• hot stamp printing foil films of gold, silver, etc. are stacked as printing layers.
• the air-cleaning effect and deodorizing effect of the thin paper carton containing the photocatalyst tend to be reduced by the ink layer and the printed layer of the film.
• the printing area of the thin paper carton is preferably about 80% to 80% per area exposed to light. More preferably, it is:! -50%. If necessary, when manufacturing cartons for thin paper, varnishing and unloading may be carried out. This step can be omitted.
• the intermediate product of the thin paper carton after printing is subjected to a punching process.
• a punching process a punching process, a picking perforation process, and a line punching process for folding a box are performed in the form of a development view of the surface.
• An embossing treatment may be performed in the punching process for cosmetics.
• the intermediate product of the thin paper carton after the punching process is further bonded with a slitting polyethylene film by a window pasting machine using an acetic acid bule type, EVA type adhesive or the like.
• acetic acid bule type, EVA type adhesive or the like.
• tissue processing supply thin paper cartons with a processing machine called cartoner, stand up thin paper cartons, insert thin tissue such as tissue from the side of thin paper cartons, seal with adhesive, and press-bond.
• a thin paper box containing the thin paper can be obtained.
• What is packed in a thin paper box in the present invention is household, commercial, industrial facial tissue, toilet paper, paper towels, table napkins, and other sanitary paper, and paper or non-woven wipers.
• the form may be a sheet shape such as a V-shaped fold, a C-shaped fold, a Z-shaped fold, or a roll shape.
• Fig. 1 shows an example of the thin paper box manufactured in this way, and the A, B, C, D, and E surfaces of the thin paper box shown in Fig. 1 (solar light, fluorescent light, light bulbs, etc. are effective) area practical standpoint surface) standpoint force et 400 cm 2 force of the air cleaning effect and deodorizing effect, Shi preferred that a et 2, 000cm 2 les.
• Example [0029] The present invention will be specifically described below with reference to examples, but it should be understood that the present invention is not limited to these examples. Unless otherwise specified, parts and percentages in the examples refer to parts by weight and% by weight, respectively. The coating liquid and the obtained cast coated paper were tested based on the evaluation method as shown below.
• Titanium oxide particle measurement calculated from a photograph taken with an electron microscope.
• the fine titanium oxide slurry was thinly applied on the electron microscope data base and dried in a drier set at 40 ° C. Thereafter, the particles were observed and measured with a FE-SEM (field emission scanning electron microscope / JSM-6700F manufactured by Nippon Denshi Co., Ltd.) at an imaging magnification of 10,000. For secondary particles, the average value obtained by measuring 100 particle sizes was taken as the average particle size of secondary particles.
• FE-SEM field emission scanning electron microscope / JSM-6700F manufactured by Nippon Denshi Co., Ltd.
• Blank paper texture The blank paper texture such as gloss unevenness on the cast coated paper surface was visually evaluated. ⁇ : Extremely good, ⁇ : Good, ⁇ : Slightly inferior, X: Inferior
• Photocatalytic effect Evaluated by Photocatalyst Performance Evaluation Test Method IIb “Gas Bag B Method” established by the Photocatalyst Products Technology Council. Acetaldehyde decomposition rate (%) after irradiation with ultraviolet rays for 20 hours was measured and evaluated in four stages according to the decomposition rate.
• ⁇ Very good (decomposition rate: 70./. Or more), ⁇ : Slightly excellent (same: 69-50%), ⁇ : Slightly inferior (same: 49%-: 10%), X: Slightly inferior (same as above) : less than 10)
• the pigment slurry dispersed with a variety mixer was added to prepare a pigment slurry having a solid content of 60%.
• Antifoam (San Nopco 1407 / San Nopco) 0.5 parts, mold release agent (Knob Coat C104 / San Nopco) 5 parts, Styrene-butadiene copolymer latex A (Glass transition temperature—10 ° C, 15 parts of particle diameter 190 nm) and 7 parts of casein were added (latex ratio: 68%), and water was further added to prepare a coating solution having a solid content of 50%.
• One side was coated with a blade coater on a base paper having a basis weight of 100 g / m 2 containing 100 parts of chemical pulp and 12 parts of light calcium carbonate as a filler so that the coating amount was 20 g / m 2 and dried.
• the coated paper thus obtained is rewet on the surface of the coating layer with a rewetting liquid (polyethylene emulsion 0.5% concentration), and then pressed by a forming roll and a cast drum. And then press and dry on a cast drum with a speed of 100 m / min and a surface temperature of 115 ° C, and then release from the cast drum with a strip-off roll to remove the cast coated paper by the re-cast method. Obtained.
• Titanium oxide slurry A 10 parts of coating liquid, 10 parts of colloidal silica, grade 1 kaolin (trade name: UW_90 / manufactured by Engelhard) 60 parts, light calcium carbonate (TP1 21 / made by Okutama Kogyo) 30 parts Instead of 20 parts titanium oxide slurry, 20 parts colloidal silica, 50 parts kaolin (product name: JapanglossZj.M. Huber), light calcium carbonate (TP12 (1 / Okutama Kogyo Co., Ltd.) A cast coated paper was obtained in the same manner as in Example 1 except that the amount was changed to 30 parts.
• Example 1 15 parts of styrene-butadiene copolymer latex A (glass transition temperature_10. C, particle diameter 190 nm) and 7 parts of casein (latex ratio: 70%) in the coating liquid were mixed with styrene-butadiene copolymer.
• a cast coated paper was obtained in the same manner as in Example 1, except that the united latex was changed to 19 parts (latex rate: 100%).
• Example 1 Except that the styrene-butadiene copolymer latex A (glass transition temperature—10 ° C.) was changed to the styrene-butadiene copolymer latex B (glass transition temperature—23 ° C.). Obtained a cast coated paper in the same manner as in Example 1.
• Example 1 15 parts of styrene-butadiene copolymer latex A (glass transition temperature—10 ° C., particle size 190 nm) and 7 parts of casein (latex ratio: 70%) in the coating liquid were styrene-butadiene copolymer.
• Latex A Glass transition temperature—10 ° C, particle size 190 nm
• Casein 12 parts Polybulal alcohol (trade name; PVA117 / Kuraray) 12 parts (latex rate: 20%)
• a cast coated paper was obtained in the same manner as in Example 1.
• Example 1 the cast paint was applied with a reverse roll coater attached to the cast coater so that the coating amount was 20 g / m 2 per side, and then coagulated with a calcium formate aqueous solution (10%).
• the wet coating layer is gelled by contact with the liquid, and the gelled coating layer is passed through a press ep formed by a foamer roll and a cast drum, and the speed is 70 m / min and the surface temperature is 115 ° C. After being pressed against the cast drum and dried, it was released from the cast drum with a strip-off roll to obtain a cast coated paper by a coagulation method.
• Example 6 instead of 1st grade kaolin (trade name: UW_90 / Engelhard) 60 parts of coating liquid, 30 parts of light calcium carbonate (TP121 / Okutama Kogyo Co., Ltd.) Dokaolin (trade name: Eclipse 650 / Engelhard) 70 parts, Light calcium carbonate (TP121 / Okutama Kogyo) 20 parts Obtained.
• kaolin product name: Japanglos sZj.M. Huber
• light calcium carbonate TP121 / Okutama Kogyo Co., Ltd.
• Example 1 10 parts of titanium oxide slurry of coating liquid, 10 parts of colloidal silica, kaolin (trade name: UW-90 / Engelno, manufactured by Dou) 60 parts, light calcium carbonate (TP121 / manufactured by Okutama Industry) Instead of 30 parts, Kaolin (trade name: UW-90 / Engelno, manufactured by Dod) 70 parts, light calcium carbonate (TP121 / Okutama Kogyo) 30 parts, except that it was changed in the same manner as Example 1 A cast coated paper was obtained.
• kaolin trade name: UW-90 / Engelno, manufactured by Dou
• TP121 / manufactured by Okutama Industry light calcium carbonate
• Kaolin trade name: UW-90 / Engelno, manufactured by Dod
• TP121 / Okutama Kogyo light calcium carbonate
• Example 1 10 parts of titanium oxide slurry of coating liquid, 10 parts of colloidal silica, kaolin (trade name: UW-90 / Engelno, manufactured by Dou) 60 parts, light calcium carbonate (TP121 / manufactured by Okutama Industry) Instead of 30 parts, 40 parts of titanium oxide slurry, 40 parts of colloidal silica, 40 parts of strength (product name: UW-90 / Engelhard), 20 parts of light calcium carbonate (TP121 / Okutama Kogyo) Produced cast coated paper in the same manner as in Example 1.
• Example 1 10 parts of titanium oxide slurry A in the coating liquid was changed to 10 parts of fine titanium oxide slurry B (STR-60N, Sakai Chemical Industry, primary particle diameter 40-50 nm, average particle diameter of secondary particles 25 OOnm) A cast coated paper was obtained in the same manner as in Example 1 except that. The results are shown in Table 1. table 1]
• the coated paper obtained in this way is rewet on the surface of the coating layer with a rewetting liquid (polyethylene emulsion 0.5% concentration), and then applied to a press dip formed by a foamer roll and a cast drum. Pass through the paper, press on a cast drum with a speed of 100m / min, and a surface temperature of 115 ° C, dry, and then release from the cast drum with a strip-off roll, and a basis weight of 460g / m 2 A cast coated paper was obtained. This cast coated paper was used as a ton base paper for thin paper.
• a rewetting liquid polyethylene emulsion 0.5% concentration
• Carton base paper for thin paper was printed so that letters and designs would appear on the faces A, B, C, D, and E in Fig. 1 when a thin paper box was formed in the printing process (offset printing).
• the printed area was 20% of the total area of A + B + C + D + E.
• a punching machine was used to punch out the box, and it was processed so that the perforation for removing the sewing machine and the line for folding the box came to the part E on the top of Fig. 1 to obtain a thin paper carton. .
• Example 9 the cast paint was applied with a reverse roll coater attached to the cast coater so that the coating amount was 30 g / m 2 per side, and then coagulated with a calcium formate aqueous solution (10%).
• the wet coating layer is gelled by contact with the liquid, and the gelled coating layer is passed through a press ep formed by a foamer roll and a cast drum, and the speed is 70 m / min and the surface temperature is 115 ° C.
• a box with tissue is obtained in the same way as in Example 9, except that the cast coated paper by the coagulation method is made into a carton base paper for thin paper by releasing from the cast drum with a strip-off roll after pressing and drying to the cast drum. It was.
• Example 9 instead of the white paperboard having a basis weight of 430 gZm 2, a white paperboard having a basis weight of 330 g / m 2 was used to obtain a base paper carton base paper for cast paper having a basis weight of 360 g / m 2 .
• offset printing was performed so that the printing area (A, B, C, D, E) was 40%.
• the toilet paper was packed in the thin paper box processing process to obtain a box with toilet paper.
• Example 9 fine titanium oxide slurry A (CSB-M; Sakai Chemical Co., Ltd .; secondary particle diameter 20-30 nm, secondary particle average particle diameter lOOOnm) 10 parts (solid content), colloidal silica (Nissan Chemical Co., Ltd.) SNOWTEX 40) Instead of 16 parts, fine titanium oxide slurry A (CSB-M manufactured by Sakai Chemical Co., Ltd .; secondary particle diameter 20-30 nm, secondary particle average particle diameter lOOOnm) 10 parts (solid content), colloidal silica (Snowtex 40, manufactured by Nissan Chemical Co., Ltd.) A box containing tissue was obtained in the same manner as in Example 9 except that the amount was changed to 10 parts.
• Example 9 instead of 10 parts of titanium oxide slurry, 16 parts of colloidal silica, 60 parts of kaolin (product name: UW-90Z Engelhard), 30 parts of light calcium carbonate (TP121Z, manufactured by Okutama Kogyo) , Kaolin (trade name: UW-90 / manufactured by Engelhard) 70 parts, light calcium carbonate (TP121Z Okutama Kogyo Co., Ltd.) 30 parts were obtained, except that cast coated paper was obtained in the same manner as in Example 9. . Use this cast coated paper as a carton for thin paper Paper was used and a box containing tissue was obtained in the same manner as in Example 9.
• Running performance with a ton of force The running performance when producing a ton of paper for thin paper and when processing a thin paper box was compared in the following four stages.
• Examples 9 to 12 have high white paper gloss, excellent photocatalytic effect, fading property, ability to scratch a ton, and carton-carrying ability such as carton running ability. It is. On the other hand, Comparative Example 4 is inferior in the photocatalytic effect, fading property, and carton scratchability.

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• 2007
  • 2007-06-07 EP EP07744891A patent/EP2042656A4/en not_active Withdrawn
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