EP1273708A1 - Paper for newspaper - Google Patents

Paper for newspaper Download PDF

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Publication number
EP1273708A1
EP1273708A1 EP01900679A EP01900679A EP1273708A1 EP 1273708 A1 EP1273708 A1 EP 1273708A1 EP 01900679 A EP01900679 A EP 01900679A EP 01900679 A EP01900679 A EP 01900679A EP 1273708 A1 EP1273708 A1 EP 1273708A1
Authority
EP
European Patent Office
Prior art keywords
paper
newspaper
pulp
forming
flexural stiffness
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.)
Withdrawn
Application number
EP01900679A
Other languages
German (de)
English (en)
French (fr)
Inventor
Shinichi Nippon Paper Indust. Co Ltd NAKAYAMA
Kazufumi Nippon Paper Indust. Co Ltd YAMAZAKI
Yozu Nippon Paper Indust. Co. Ltd. IGARASHI
Hideki Nippon Paper Indust. Co. Ltd FUJIWARA
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 Paper Industries Co Ltd
Jujo Paper Co Ltd
Original Assignee
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
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 Paper Industries Co Ltd, Jujo Paper Co Ltd filed Critical Nippon Paper Industries Co Ltd
Publication of EP1273708A1 publication Critical patent/EP1273708A1/en
Withdrawn legal-status Critical Current

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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
    • 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

  • This invention relates to paper for newspaper that could offer excellent bending property in the folding section of a web-offset rotary press.
  • Forming jamming is explained with reference to FIG. 1.
  • the papers printed in different presses are stacked together at the entrance to the folding section.
  • the paper stack is then pulled by a drag roller 5 and feeder pin 4, and is cut to the width of two facing pages by a slitter knife 12 at the center.
  • the newly sized papers are fed over a former (triangular plate) 6 and through forming rollers 7, finally reach nipping rollers 8, where the papers are folded lengthwise.
  • the folded papers are cut to the length of one page by a shearing cylinder 2 as they pass between the shearing cylinder 2 and a folding cylinder 3, and then folded widthwise along the center by the folding cylinder 3 and folding rollers 9.
  • the papers thus folded in four are fed into a delivery fan 10, through which they are discharged onto a delivery belt 11 and output from the folding section.
  • the machine also has transfer rollers 13, which are used to transfer the papers to the folding mechanism on the opposite side when the current folding mechanism does not work properly.
  • the inventors of this invention took notice of the potential causes of forming jamming, such as the rigidity of paper, which makes it difficult to fold stacked papers, and poor running performance of paper on the former. To analyze the factors of forming jamming, the various physical properties of papers that did and did not cause forming jamming were compared.
  • the friction coefficient which serves as an index of the running stability of paper, was measured. The result made it clear that the level of friction coefficient has nothing to do with the occurrence of forming jamming.
  • the rigidity (stiffness) of paper was examined.
  • the Clark stiffness value-a measure generally used in the evaluation of paper rigidity- was compared between a paper that caused forming jamming and one that didn't. No clear correlation was found in this comparison.
  • the rigidity of each paper was evaluated by hand, the paper that didn't cause forming jamming was clearly felt softer and less rigid compared with the paper that caused forming jamming. Still, the sensory evaluation results didn't fully correspond to the Clark stiffness values.
  • softener a surface-active agent referred to as "softener”
  • softener a surface-active agent referred to as "softener”
  • the use of softener noticeably reduces the strength of the paper, giving rise to the problem of breaking. Therefore, the application of softener to paper for newspaper is not ideal.
  • this invention was developed with the aim of providing paper for newspaper that could offer excellent folding property and minimize the forming jamming often seen in web-offset rotary presses.
  • the inventors found a correlation between the folding property and the average pure flexural stiffness of paper.
  • the inventors also found that if the average pure flexural stiffness of paper in the direction perpendicular to the direction of printing, i.e., the widthwise direction, is within the range of 1 to 11 ⁇ N•m 2 /m, as measured following humidity conditioning at 23°C, 50%RH, then in the practical sense forming jamming doesn't occur.
  • This invention is based on a correlation between pure flexural stiffness in the paper's widthwise direction on one hand and the result of sensory evaluation on me other, as found through an investigation of paper's physical properties as corresponding to the results of sensory evaluation.
  • the widthwise direction refers to the direction perpendicular to the printing direction of the newspaper rolls as they run through a web-offset rotary press.
  • Clark stiffness -a measure generally used in the evaluation of paper rigidity-and pure flexural stiffness a possible explanation is that the Clark stiffness value is measured in the elastic range, whereas pure flexural stiffness is measured under conditions in which the sample is bent 90 degrees or more, indicating a range in excess of the elastic range.
  • Clark stiffness is affected by the dead weight of the sample, average pure flexural stiffness is not subject to such effect, which may have contributed to the difference in the sensory evaluation result with regard to rigidity.
  • This invention is characterized by a paper for newspaper that could offer excellent folding property while suppressing forming jamming, by fixing the average pure flexural stiffness in the paper's widthwise direction to a range of 1 to 11 ⁇ N•m 2 /m, as measured following humidity conditioning at 23°C, 50%RH.
  • the former or nipping roller of a web-offset rotary press used for printing newspapers can fold papers at an angle in excess of 90 degrees, and on a practical basis up to 180 degrees. Therefore, the folding property of paper is deemed to have a good correlation with pure flexural stiffness. If the average pure flexural stiffness is below 1 ⁇ N•m 2 /m, the rigidity becomes too low and the paper won't run properly in the web-offset rotary press. On the other hand, the average pure flexural stiffness exceeding 11 ⁇ N•m 2 /m makes folding difficult, thus increasing the occurrences of forming jamming.
  • the various means for fixing the average pure flexural stiffness in the paper's widthwise direction to a range of 1 to 11 ⁇ N•m 2 /m include applying more calendering, increasing the mixing ratio of deinked pulp, increasing the mixing ratio of filler, intensifying the beating of the pulp, and adding softener and other additives.
  • these methods change other physical properties of the paper, including its strength, density and printability. This is why it has been difficult to fix the average pure flexural stiffness to a range of 1 to 11 ⁇ N•m 2 /m without affecting the quality of the paper.
  • the inventors found a means for fixing the average pure flexural stiffness to a range of 1 to 11 ⁇ N•m 2 /m without affecting the quality of paper too much, by fixing the pH value of paper between 5 and 9.5-or more preferably, between 6.5 and 9.5-using the cold extraction-based pH test method of paper as defined in JIS P8133.
  • the paper for newspaper provided by this invention is made by mixing kraft pulp, ground wood pulp, thermo-mechanical pulp, chemi-thermo-mechanical pulp and deinked pulp at arbitrary ratios and forming the mixed materials into sheets having a basis weight of 35 to 45 g/m 2 or less.
  • deinked pulp an increased mixing ratio helps lower the average pure flexural stiffness.
  • the ratio of deinked pulp to total pulp components should preferably be 50 wt-% or more.
  • Softener may be added to adjust the average pure flexural stiffness to a range of between 1 and 11 ⁇ N•m 2 /m.
  • the paper for newspaper provided by this invention is manufactured using a publicly known paper machine, such as a Fourdrinier paper machine or a twin-wire paper machine of on-top, hybrid or gapped former type.
  • the jet-wire ratio should be set as appropriate in the range of 90 to 110 percent. A setting between 97 and 103 percent is normally preferred.
  • the paper for newspaper provided by this invention may contain fillers such as calcium carbonate, clay, kaoline, white carbon, titanium oxide and synthetic resin (vinyl-chloride resin, polystyrene resin or urea-formalin resin).
  • fillers such as calcium carbonate, clay, kaoline, white carbon, titanium oxide and synthetic resin (vinyl-chloride resin, polystyrene resin or urea-formalin resin).
  • the use of calcium carbonate as a filler is recommended.
  • the mixing ratio of filler should preferably be between 2 and 12 wt-% in ash content, or more preferably, between 4 and 10 wt-%. Normally, the addition of a filler reduces the average pure flexural stiffness.
  • the paper for newspaper provided by this invention may be coated with surface-treatment agents such as starch, including oxidized starch, esterified starch, eterized starch and cationized starch, polyacrylamide and polyvinyl alcohol, within a range not affecting the average pure flexural rigidity.
  • surface-treatment agents such as starch, including oxidized starch, esterified starch, eterized starch and cationized starch, polyacrylamide and polyvinyl alcohol, within a range not affecting the average pure flexural rigidity.
  • surface-sizing agents such as styrene/acrylate copolymer, styrene/(meth)acrylate copolymer (the term "(meth)acrylate” herein referring to "acrylate and/or methacrylate”), styrene/(meth)acrylate/(meth)acrylate esters copolymer, styrene/maleate copolymer, styrene/maleate half-ester copolymer, styrene/maleate ester copolymer, ethylene/acrylate copolymer, isobutylene/acrylate copolymer, n-butylene/(meth)acrylate/(meth)acrylate ester copolymer, propylene/maleate copolymer and ethylene/maleate copolymer.
  • the paper for newspaper provided by this invention may contain: sizing agents such as rosin sizing agent, rosin-emulsion sizing agent, alkylketene dimer and alkenyl succinic anhydride; paper-reinforcing agents such as polyacrylamide high polymer, polyvinyl-alcohol high polymer, cationized starch, urea/formalin resin and melamine/formalin resin; freeness-enhancing or retention-aiding agents such as acrylamide/aminomethyl acrylamide copolymer salt, cationized starch, polyethyleneimine, polyethylene oxide and acrylamide/sodium acrylate copolymer, or auxiliaries such as aluminum sulfate, waterproofing agent, UV-protection agent and fadeproofing agent.
  • sizing agents such as rosin sizing agent, rosin-emulsion sizing agent, alkylketene dimer and alkenyl succinic anhydride
  • the physical properties of the paper for newspaper provided by this invention must accommodate printing by a web-offset rotary press. It should be sufficient if the tensile strength, tear strength, elongation and other physical properties of the paper are equivalent to those of normal papers used for newspaper printing.
  • Paper for newspaper having a basis weight of 45 g/m 2 was produced by mixing six parts of softwood kraft pulp, 10 parts of ground pulp, 16 parts of thermo-mechanical pulp and 68 parts of deinked wastepaper pulp, adding as a filler a mixture of calcium carbonate and white carbon to six percent in ash content, and then forming the mixed materials into sheet of paper using a twin-wire-type paper machine at a jet-wire ratio of 103 percent.
  • Paper for newspaper having a basis weight of 45 g/m 2 was produced by mixing five parts of soft wood kraft pulp, 12 parts of ground pulp, 13 parts of thermo-mechanical pulp and 70 parts of deinked wastepaper pulp, adding as a filler a mixture of calcium carbonate and white carbon to six percent in ash content, and forming the mixed materials into sheet of paper using a twin-wire-type paper machine at a jet-wire ratio of 100%.
  • Paper for newspaper having a basis weight of 44 g/m 2 was produced by mixing five parts of soft wood kraft pulp, 12 parts of ground pulp, 13 parts of thermo-mechanical pulp and 70 parts of deinked wastepaper pulp, adding as a filler a mixture of calcium carbonate and white carbon to six percent in ash content, and forming the mixed materials into sheet of paper using a twin-wire-type paper machine at a jet-wire ratio of 100%.
  • Paper for newspaper having a basis weight of 46 g/m 2 was produced by mixing 10 parts of softwood kraft pulp, 13 parts of ground pulp, 17 parts of thermo-mechanical pulp and 60 parts of deinked wastepaper pulp, adding kaoline to six percent in ash content as a filler, and forming me mixed materials into sheet of paper using a twin-wire-type paper machine at a jet-wire ratio of 101 percent.
  • Paper for newspaper having a basis weight of 46 g/m 2 was produced by mixing 10 parts of soft wood kraft pulp, 13 parts of ground pulp, 17 parts of thermo-mechanical pulp and 60 parts of deinked wastepaper pulp, adding kaoline to six percent in ash content as a filler, and forming the mixed materials into sheet of paper using a twin-wire-type paper machine at a jet-wire ratio of 100%.
  • Paper for newspaper having a basis weight of 45 g/m 2 was produced by mixing 10 parts of soft wood kraft pulp, 13 parts of ground pulp, 17 parts of thermo-mechanical pulp and 60 parts of deinked wastepaper pulp, adding kaoline to six percent in ash content as a filler, and forming the mixed materials into sheet of paper using a twin-wire-type paper machine at a jet-wire ratio of 100%.
  • Paper for newspaper having a basis weight of 44 g/m 2 was produced by mixing six parts of soft wood kraft pulp, 10 parts of ground pulp, 16 parts of thermo-mechanical pulp and 68 parts deinked wastepaper pulp, adding kaoline to six percent in ash content as a filler, and forming the mixed materials into sheet of paper using a twin-wire-type paper machine at a jet-wire ratio of 100%.
  • the papers for newspaper provided in examples 1 to 3, whose average pure flexural stiffness in the widthwise direction was fixed to a range of 1 to 11 ⁇ N•m 2 /m following humidity conditioning at 23°C, 50%RH, offer excellent folding property and running performance and didn't cause forming jamming when printed in an actual web-offset rotary press at a printing speed of 120,000 copies per hour or more.
  • This invention made it possible to provide paper for newspaper that could offer excellent folding property and reduce the occurrence of forming jamming often seen in web-offset rotary presses, based on the findings that the folding property of paper correlates to the average pure flexural stiffness and that forming jamming doesn't practically occur if the average pure flexural stiffness of paper in the direction perpendicular to the direction of printing, i.e., the widthwise direction, is within the range of 1 to 11 ⁇ N•m 2 /m, as measured following humidity conditioning at 23°C, 50%RH.

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  • Paper (AREA)
EP01900679A 2000-01-12 2001-01-12 Paper for newspaper Withdrawn EP1273708A1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2000003875 2000-01-12
JP2000003875 2000-01-12
JP2000394419 2000-12-26
JP2000394419A JP4323714B2 (ja) 2000-01-12 2000-12-26 新聞用紙
PCT/JP2001/000102 WO2001051710A1 (fr) 2000-01-12 2001-01-12 Papier journal

Publications (1)

Publication Number Publication Date
EP1273708A1 true EP1273708A1 (en) 2003-01-08

Family

ID=26583404

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01900679A Withdrawn EP1273708A1 (en) 2000-01-12 2001-01-12 Paper for newspaper

Country Status (7)

Country Link
EP (1) EP1273708A1 (sv)
JP (1) JP4323714B2 (sv)
KR (1) KR100726792B1 (sv)
AU (1) AU2001225495A1 (sv)
CA (1) CA2396783A1 (sv)
SE (1) SE524600C8 (sv)
WO (1) WO2001051710A1 (sv)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3829756B2 (ja) * 2002-05-16 2006-10-04 日本製紙株式会社 オフセット印刷用新聞用紙
JP4370300B2 (ja) 2003-03-25 2009-11-25 日本製紙株式会社 オフセット印刷用新聞用紙
JP4523255B2 (ja) * 2003-09-19 2010-08-11 日本製紙株式会社 オフセット印刷用新聞用紙とその評価方法
JP4605518B2 (ja) * 2003-09-24 2011-01-05 ハリマ化成株式会社 新聞用紙用ロジン系エマルションサイズ剤を含有する新聞用紙の製造方法
JP4601972B2 (ja) * 2004-02-26 2010-12-22 日本製紙株式会社 中質書籍用紙
JP4590195B2 (ja) * 2004-02-26 2010-12-01 日本製紙株式会社 新聞印刷用紙
JP4590194B2 (ja) * 2004-02-26 2010-12-01 日本製紙株式会社 上質紙
JP2006063501A (ja) * 2004-08-30 2006-03-09 Daio Paper Corp 新聞用紙
JP2006124885A (ja) * 2004-10-29 2006-05-18 Daio Paper Corp 中性新聞用紙およびその製造方法
JP5038669B2 (ja) * 2006-09-19 2012-10-03 丸住製紙株式会社 新聞巻取紙およびその評価方法
KR101032863B1 (ko) 2009-07-01 2011-05-06 주식회사 슈프리마 복수의 지문센서를 구비한 지문인증장치 및 방법
JP5466912B2 (ja) * 2009-10-07 2014-04-09 大王製紙株式会社 新聞用巻取紙

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2889159B2 (ja) * 1995-09-13 1999-05-10 日本製紙株式会社 中性新聞用紙及びその製造方法
US5827398A (en) * 1996-02-13 1998-10-27 Allied Colloids Limited Production of filled paper
EP1084297B1 (en) * 1998-05-27 2004-08-25 J.M. Huber Denmark APS Use of colloidal precipitated calcium carbonate as a filler in the preparation of paper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0151710A1 *

Also Published As

Publication number Publication date
JP4323714B2 (ja) 2009-09-02
JP2001262485A (ja) 2001-09-26
AU2001225495A1 (en) 2001-07-24
CA2396783A1 (en) 2001-07-19
KR100726792B1 (ko) 2007-06-11
SE0202185D0 (sv) 2002-07-11
SE0202185L (sv) 2002-09-12
SE524600C8 (sv) 2004-12-01
SE524600C2 (sv) 2004-08-31
KR20020075886A (ko) 2002-10-07
WO2001051710A1 (fr) 2001-07-19

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