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
  • D21H1/00—Paper; Cardboard
• • 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
  • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
  • D21H11/14—Secondary fibres
• • 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

Definitions

• the present invention relates to newsprint that has extremely excellent bending suitability in a folded portion of a news offset rotary press.
• the paper printed by each press is stacked at the entrance of the fold, then pulled by the drag roller 5 and the squirrel 4 while being pulled by the slitter knife 1 in the center. It is cut into a width, it goes to a former (triangular plate) 6, passes through a forming roller 7, and is vertically folded at a nipping roller 8.
• the folded paper is cut to the length of one page of the newspaper by the saw cylinder 2 when passing between the saw cylinders 2 and 3. It is folded from the center by the folding cylinder 3 and the folding roller 9.
• the four-folded paper is received by the delivery fan 10, placed on the delivery belt 11, and discharged to the outlet of the folding section.
• a transfer roller 13 is provided, and when one of the folding mechanisms is malfunctioning, it is possible to transfer to the opposite folding mechanism.
• the present inventors have studied the strengthening of the calendering process, the increase in the proportion of waste paper pulp, the increase in ash content in paper, and the like as means for reducing the stiffness of paper and making it softer.
• clogging of the sword is not always improved, but rather wrinkles are easily formed, runnability is deteriorated, and certain problems such as paper dust are more likely to occur, causing other troubles and effective measures. Did not become.
• a surfactant called a softening agent is also being considered to reduce the stiffness and softness of the paper, but the strength is remarkably reduced, and there is a fear that the paper will break. It is difficult.
• the present invention has been developed with the object of providing a newspaper for papers which is excellent in bending aptitude and reduces the occurrence of sword sticking, which is a trouble in newspaper offset rotary printing.
• the present inventors have conducted intensive studies in order to solve the above-mentioned problems, and as a result, the bending suitability of the newspaper has a correlation with the average pure bending stiffness, and the direction perpendicular to the printing direction, that is, 23 ° C, At 50% RH, it was found that if the average pure bending stiffness in the horizontal direction of newspaper paper after humidity control was 1 to 11 ⁇ Nm 2 / m, virtually no sword clogging would occur, and the present invention was achieved. completed.
• the present inventors have already disclosed in Japanese Patent Application No. 2000-3875 that the average pure bending in the lateral direction of the newspaper after the humidity control at 20 ° C and 65% RH is set as the condition of the paper that does not cause sword jam.
• the stiffness was specified as 1 to 10 ⁇ m ⁇ m 2 / m
• the humidity control condition of paper was changed from JIS method (humidity control at 20 ° C and 65% RH) to ISO method (23 (° C, 50% RH), the humidity control conditions were changed to 23 ° (:, 50% RH) in this application.
• Fig. 1 Schematic diagram of the folded part of a newspaper offset press ⁇ W
• the present invention has been made in the search for physical properties consistent with the sensory evaluation of newsprint based on the fact that there is a correlation between the pure bending stiffness in the lateral direction of newsprint and the sensory evaluation.
• the horizontal direction is a direction perpendicular to the printing direction of an offset rotary press for newsprinting.
• the clarity stiffness is a value measured in the elastic region.
• the pure bending stiffness is a value measured in a state of bending beyond 90 °, that is, in a region beyond the elastic region.
• Clark stiffness measurement is affected by the sample's own weight.
• the reason that the measurement of the average bending stiffness is not affected by the weight of the sample is considered to be the reason for the difference in the results of sensory evaluation of Koshi.
• bending is performed by specifying the average pure bending stiffness in the horizontal direction of newsprint after humidity conditioning at 23 ° C. and 50% RH in the range of 1 to: Ll ju N ⁇ m ⁇ m. It is characterized by its excellent aptitude and the ability to prevent the occurrence of clogging.
• the present inventors specified the pH of newsprint paper to be 5 to 9.5, preferably 6.5 to 9.5 by the test method of paper pH by the cold water extraction method specified in JIS P8133. By doing so, it was found that the average pure bending stiffness can be specified in the range of 1 to 11 ⁇ N ⁇ m 2 Zm without significantly affecting the paper quality.
• the newsprint of the present invention may be a kraft pulp, a groundwood pulp, a thermomechanical pulp, a chemisa-momechanical pulp, or a deinked pulp in any ratio. In compounded basis weight 35-45 8 1! 1 2 Aru in those papermaking with less. The higher the blending ratio of deinked pulp, the lower the average pure bending stiffness is. The blending ratio in all pulp components is 50% by weight. / 0 or more is preferable. A softening agent may be added to adjust the average pure bending stiffness to 1 to 11 // N ⁇ m 2 m or less.
• the newsprint of the present invention is produced by a known paper machine such as a fourdrinier paper machine, an on-top former type, a hybrid former type, or a twin wire type paper machine such as a gap former type.
• the jet wire ratio may be appropriately set in the range of 90 to 110%, but is usually 97 to 103 ° /. Is preferred.
• the newsprint of the present invention may contain fillers such as calcium carbonate, clay, kaolin, white carbon, titanium oxide, and synthetic resins (vinyl chloride resin, polystyrene resin, urea formalin resin). JIS mentioned above,
• filler content is 2 to 12 weight by ash content. / 0 is preferred, especially 4-10 weight. / 0 is preferred. Normally, the inclusion of filler makes it possible to reduce the average pure bending stiffness, but if the ash content is less than 2% by weight, the average pure bending stiffness is little affected. The ash content is 12 weight. If it exceeds / 0 , the amount of paper dust generated during printing increases.
• the newsprint of the present invention may be a starch such as starch, oxidized starch, esterified starch, etherified starch, cationized starch, polyacrylamide, polyvinyl alcohol, etc., within a range that does not affect the average bending rigidity. You can apply a surface treatment agent.
• Styrene acrylic acid copolymer styrene Z (meth) acrylic acid copolymer ((meth) acrylic acid means “acrylic acid and / or methacrylic acid”), styrene (meth) acrylic Acid A) Acrylic acid ester copolymer, styrene Z maleic acid copolymer, styrene z maleic acid semi-esterol copolymer, styrene maleic acid ester copolymer, ethylene Z acrylic acid copolymer, isobutylene acrylic acid copolymer Even if a surface sizing agent such as a polymer, n-butylene (meth) acrylic acid / (meth) acrylic acid ester copolymer, propylene Z maleic acid copolymer, or ethylene / maleic acid copolymer is applied Good.
• a surface sizing agent such as a polymer, n-butylene (meth) acrylic acid / (meth) acrylic acid este
• the newsprint of the present invention may contain, if necessary, a sizing agent such as a rosin sizing agent, a rosin emanoresion sizing agent, an alkyne / leketene dimer, and an anorechenino succinic anhydride; a polyacrylamide-based agent.
• a sizing agent such as a rosin sizing agent, a rosin emanoresion sizing agent, an alkyne / leketene dimer, and an anorechenino succinic anhydride
• a polyacrylamide-based agent such as a sizing agent, a rosin emanoresion sizing agent, an alkyne / leketene dimer, and an anorechenino succinic anhydride.
• High-strength agents such as polymers, polybiol alcohol-based polymers, cationized starch, urea z-formalin resin, melamine z-formalin resin; salt of copolymer of acrylamide aminomethyl acrylamide, cationized starch, polyethylene Drainage or retention improvers such as imine, polyethylene oxide, acrylamide / sodium acrylate copolymer; auxiliaries such as aluminum sulfate (sulfate band), water-proofing agent, UV inhibitor, anti-fading agent, etc. It may contain.
• the physical properties of the newsprint of the present invention need to be such that it can be printed with an offset printing press, and may be any material having physical properties such as tensile strength, tear strength and elongation comparable to ordinary newsprint paper.
• Test methods and evaluation methods were based on the following.
• the average pure bending stiffness was also measured for test specimens conditioned at 20 ° C and 65% RH.
• Clark stiffness 23 ° C, 50% RH, after humidity control, measured in the horizontal direction of newsprint according to JIS P8143: 1967.
• Ash Measured at a temperature of 575 ° C according to ISO 2144-1987 (JIS P8128).
• the obtained newspaper roll paper was measured for average pure bending stiffness, Clark stiffness, friction coefficient, pH, and ash content, and the sword tip clogging was evaluated. The results are shown in Table 1.
• Paper was made with a twin-wire type paper machine at a jet wire ratio of 100% to produce newsprint with a basis weight of 44 g Zm 2 .
• the obtained newspaper wound paper was measured for average pure bending stiffness, Clark stiffness, coefficient of friction, pH, and ash, and further evaluated for clogging of the sword. The results are shown in Table 1.
• the obtained newspaper wound paper was measured for average pure bending stiffness, Clark stiffness, coefficient of friction, pH, and ash, and further evaluated for clogging of the sword. The results are shown in Table 1.
• the obtained newspaper wound paper was measured for average pure bending stiffness, Clark stiffness, coefficient of friction, pH, and ash, and further evaluated for clogging of the sword. The results are shown in Table 1.
• the paper was made at a jet wire ratio of 100% using a press to produce newsprint paper having a basis weight of 44 g Zm 2 .
• the newsprint is subjected to a direction perpendicular to the printing direction, that is, 23 ° C and 50% RH, and the newsprint after humidity conditioning.
• the long lateral mean a pure bending stiffness is 1 ⁇ 11 ⁇ N ⁇ m 2 m, in effect, found that the loop-taker point clogging does not occur, folding excellent suitability point of a sword clogging of a trouble newspaper web offset printing It has become possible to provide newsprint with a reduced occurrence.

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Citations (3)

• 2000
  • 2000-12-26 JP JP2000394419A patent/JP4323714B2/ja not_active Expired - Fee Related
• 2001
  • 2001-01-12 AU AU2001225495A patent/AU2001225495A1/en not_active Abandoned
  • 2001-01-12 WO PCT/JP2001/000102 patent/WO2001051710A1/ja not_active Ceased
  • 2001-01-12 KR KR1020027008886A patent/KR100726792B1/ko not_active Expired - Fee Related
  • 2001-01-12 CA CA002396783A patent/CA2396783A1/en not_active Abandoned
  • 2001-01-12 EP EP01900679A patent/EP1273708A1/en not_active Withdrawn
• 2002
  • 2002-07-11 SE SE0202185A patent/SE524600C8/sv not_active IP Right Cessation

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