EP0478045B1 - Soft paper of high strength and method for production thereof - Google Patents

Soft paper of high strength and method for production thereof Download PDF

Info

Publication number
EP0478045B1
EP0478045B1 EP91202328A EP91202328A EP0478045B1 EP 0478045 B1 EP0478045 B1 EP 0478045B1 EP 91202328 A EP91202328 A EP 91202328A EP 91202328 A EP91202328 A EP 91202328A EP 0478045 B1 EP0478045 B1 EP 0478045B1
Authority
EP
European Patent Office
Prior art keywords
pulp
paper
fibre
cellulosic
mixture
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.)
Expired - Lifetime
Application number
EP91202328A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0478045A1 (en
Inventor
Leif Elsby
Margareta Öijerfeldt
Marie Turunen
Anette Thyberg
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.)
Nouryon Pulp and Performance Chemicals AB
Original Assignee
Eka Nobel AB
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 Eka Nobel AB filed Critical Eka Nobel AB
Publication of EP0478045A1 publication Critical patent/EP0478045A1/en
Application granted granted Critical
Publication of EP0478045B1 publication Critical patent/EP0478045B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/10—Mixtures of chemical and mechanical pulp

Definitions

  • the present invention concerns a soft but also strong paper which is based on a mixture of a hardwood pulp, a waste paper pulp or a mechanical or semi-mechanical cellulosic pulp, or a mixture thereof, and a sulphate pulp and/or sulphite pulp based on softwood; as well as a method for the production thereof.
  • a soft paper e.g. tissue paper
  • tissue paper should be not only soft, but also strong.
  • one main component is long-fibred to impart strength to the paper, while the other main component is short-fibred to give the paper its softness and the desired absorption qualities.
  • the long-fibred pulp is usually based on softwood, such as pine wood or spruce wood, which has been chemically delignified by a sulphate or sulphite process.
  • the short-fibred pulp is generally based on hardwood, such as birch wood, eucalyptus wood, aspen wood or oak wood, which has been delignified by a sulphate process.
  • the cellulosic raw material may to a certain extent be based also on mechanical and semi-mechanical pulp, such as groundwood pulp, TMP and CTMP pulp and waste paper pulp.
  • the long-fibred pulps for example chemical pulp from spruce wood or pine wood, has a fibre length of about 3-3.5 mm and a fibre width of about 0.04 mm.
  • a short-fibred pulp based on birch sulphate has an average fibre length of 1.3 mm and a fibre thickness which is about half of that of conifer fibres.
  • the proportion of short fibres, so-called fines is high.
  • Mechanical, semi-mechanical and waste fibre pulp have a fibre length which usually is shorter than that of chemical pulp from spruce wood or pine wood.
  • the proportion of fines may be high. When producing soft paper, it is desirable that the proportion of fines be kept as low as possible in order to reduce dusting.
  • the latter is usually ground, e.g. in a beater or a refiner, which results in a paper of higher tensile strength.
  • the degree of grinding is generally measured as the drainage resistance of the pulp according to Schopper-Riegler (SCAN C 19:65).
  • SCAN C 19:65 Schopper-Riegler
  • US-A-2,706,155 discloses a method for producing soft paper, the starting material being a mixture of 25-70% oak wood pulp, the remainder being softwood pulp.
  • the oak wood pulp is essentially unground, whereas the softwood pulp is refined.
  • the softwood sulphate pulp was ground to 500 ml CSF, which corresponds to 25°SR, and was then mixed with equal parts of essentially unrefined oak wood sulphate pulp to achieve the desired combination of tensile strength, tearing strength, softness and absorption qualities of the paper.
  • SU-A-779,483 discloses the production of a paper from 40-60% bleached softwood sulphate pulp, 30-54% chemically refined aspen wood pulp and 5-15% birch wood sulphate pulp which has been further chemically refined to increase the strength of the paper.
  • tissue paper produced from a mixture of softwood sulphate pulp, hardwood sulphate pulp and softwood sulphite pulp ground to 23-25°SR becomes softer if the softwood sulphate pulp has first been ground to 18-20°SR.
  • SU-A-1,008,324 discloses the production of typographic paper of good opacity and ink absorbency from a paper-making pulp containing 30-40% by weight of bleached softwood sulphate pulp ground to 50-55°SR and 60-70% by weight of hardwood sulphate pulp ground to 30-35°SR.
  • a fibre-fibre-bond-reducing agent usually comprises a primary, secondary, tertiary or quaternary ammonium compound containing a hydrocarbon group having 8-30 carbon atoms and, optionally, nonionic hydrophilic chains. It is common to combine the cationic ammonium compound with a nonionic surface-active compound.
  • Such fibre-fibre-bond-reducing agents are inter alia described in US-A-3,554,862, 3,554,863 and 4,144,122, as well as in GB-A-2,121,449.
  • the fibre-fibre-bond-reducing agent markedly reduces the strength of the bonds between the fibres in the paper, while the softness increases. This is apparent from Table 1 bearing upon hand-made sheets from a mixture of 70% birch wood sulphate pulp and 30% pine wood sulphate pulp. US-A-4,795,530 tries to solve the inconvenience of strength reduction by applying the fibre-fibre-bond-reducing agent only to part of the thickness of the tissue paper, thereby to obtain an untreated part of paper maintaining its original strength. As is apparent from Table 1 below, the changes in tensile stiffness and tensile strength of the paper owing to a conventional increased grinding of a pulp mixture and the addition of a fibre-fibre-bond-reducing agent to the ground fibre mixture cancel each other out.
  • the soft paper also contains a fibre-fibre-bond-reducing agent in an amount of 0.05-2.5% by weight, as based on the amount of cellulose fibres.
  • a soft paper according to the invention has a surprisingly advantageous ratio of softness to strength.
  • the cellulosic pulp b) should be ground to above 30°SR, but preferably not above 80°SR, since pulps of so high grinding degrees require comparatively large amounts of fibre-fibre-bond-reducing agents to give the paper a satisfactory softness.
  • the cellulosic pulp b) preferably has 35-60°SR.
  • the cellulosic pulp a) should be essentially unground or ground to less than 25°SR, preferably less than 20°SR.
  • the long-fibred pulp b) has been obtained by a sulphate process or by a sulphite process is of no decisive importance. Also, whether it originates from pine wood, spruce wood or another conifer is of no vital importance either. It is, however, desirable that it has been ground in such a manner that the fibres have been shortened as little as possible. The grinding results in a fibre of higher flexibility. To benefit from this increased flexibility of the long-fibred ground cellulosic pulp, there is preferably an addition of a fibre-fibre-bond-reducing agent serving to reduce the increase in strength resulting from the grinding, when the pulp forms a sheet of paper.
  • the agent is added in such a manner as to be able to act on the bonds between the fibres.
  • the addition takes place at a stage during the preparation of the stock, but the fibre-fibre-bond-reducing agent may also be added to the cellulosic pulp a) and/or the cellulosic pulp b) or to the wet, formed or dried paper web.
  • the cellulosic pulps were ground in a beater according to SCAN C 25:67 to the desired drainage resistance determined in a Schopper-Riegler apparatus according to SCAN Standard C 19:65. In those cases when one did not want to noticeably change the drainage resistance of the cellulosic pulp, the latter was wet-defibrated according to SCAN C 18:65.
  • the cellulosic pulp Prior the formation of sheets, the cellulosic pulp, alternatively the mixture of cellulosic pulp, was stirred, optionally in the presence of a fibre-fibre-bond-reducing agent, at a pulp concentration of about 2% by weight for 10 min.
  • a fibre-fibre-bond-reducing agent In the production of sheets, use was made of tap water of 30°C whose pH had been adjusted to 6-7. The sheets were dried and conditioned according to SCAN P 2:75, whereupon the basis weight of the sheets was determined according to SCAN P 6:63.
  • a long-fibred pine wood sulphate pulp was ground to 13, 16.5, 20, 27 and 45°SR. Then, 30 parts by weight of the long-fibred pulp was mixed with 70 parts by weight of short-fibred wet-defibrated birch wood sulphate pulp, whereupon hand-made sheets were produced. The following results were obtained.
  • the ratio strength/stiffness of the paper is roughly constant at a drainage resistance of 13-27°SR of the pine wood pulp, but is considerably improved when pine wood pulp of 45°SR is used.
  • a pine wood sulphate pulp according to Example 1 and ground as below was mixed with a short-fibred pulp consisting of a wet-defibrated eucalyptus wood sulphate pulp.
  • a short-fibred pulp consisting of a wet-defibrated eucalyptus wood sulphate pulp.
  • For the sheet formation use was made of a pulp mixture of 70% eucalyptus wood sulphate pulp and 30% ground pine wood sulphate pulp. The following results were obtained.
  • a spruce wood sulphite pulp ground as below was mixed with a short-fibred wet-defibrated birch wood sulphate pulp.
  • For the sheet formation use was made of a pulp mixture of 70% birch wood sulphate pulp and 30% ground spruce wood sulphite pulp. The following results were obtained.
  • a long-fibred pine wood sulphate pulp ground as below was mixed with a short-fibred wet-defibrated birch wood sulphate pulp.
  • For the sheet formation use was made of a pulp mixture of 80% birch wood sulphate pulp and 20% ground pine wood sulphate pulp. The following results were obtained.
  • a pine wood sulphate pulp ground as below was mixed with a short-fibred wet-defibrated birch wood sulphate pulp.
  • For the sheet formation use was made of a pulp mixture of 60% birch wood sulphate pulp and 40% ground pine wood sulphate pulp. The following results were obtained.
  • the ratio of tensile strength to tensile stiffness is advantageous when the paper has a composition according to the invention.
  • a pine wood sulphate pulp ground as below was mixed with a deinked waste-paper-based pulp.
  • the pulp had been produced in a deinking plant, the waste paper consisting of computer printouts, books, brochures and the like.
  • For the sheet formation use was made of a pulp mixture of 70% waste paper pulp and 30% ground pine wood sulphate pulp. The following results were obtained.
  • a pine wood sulphate pulp ground as below was mixed with a wet-defibrated CTMP pulp.
  • CTMP wet-defibrated CMP pulp.
  • For the sheet formation use was made of a pulp mixture of 70% CTMP and 30% ground pine wood sulphate pulp. The following results were obtained.

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  • Paper (AREA)
  • Making Paper Articles (AREA)
  • Sanitary Thin Papers (AREA)
EP91202328A 1990-09-12 1991-09-10 Soft paper of high strength and method for production thereof Expired - Lifetime EP0478045B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9002900 1990-09-12
SE9002900A SE500524C2 (sv) 1990-09-12 1990-09-12 Mjukt papper med hög styrka samt förfarande för dess framställning

Publications (2)

Publication Number Publication Date
EP0478045A1 EP0478045A1 (en) 1992-04-01
EP0478045B1 true EP0478045B1 (en) 1995-03-08

Family

ID=20380335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91202328A Expired - Lifetime EP0478045B1 (en) 1990-09-12 1991-09-10 Soft paper of high strength and method for production thereof

Country Status (10)

Country Link
EP (1) EP0478045B1 (fi)
AT (1) ATE119595T1 (fi)
AU (1) AU636059B2 (fi)
CA (1) CA2051218A1 (fi)
DE (1) DE69107940T2 (fi)
ES (1) ES2069819T3 (fi)
FI (1) FI96335C (fi)
NO (1) NO177938C (fi)
NZ (1) NZ239562A (fi)
SE (1) SE500524C2 (fi)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6068734A (en) * 1995-11-24 2000-05-30 Sca Hygiene Paper Ab Soft, bulky absorbent paper containing chemithermomechanical pulp

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE504030C2 (sv) * 1995-02-17 1996-10-21 Moelnlycke Ab Spunlacematerial med hög bulk och absorptionsförmåga samt förfarande för dess framställning
FI119562B (fi) * 2000-02-07 2008-12-31 Upm Kymmene Corp Revinnäismassa, menetelmä revinnäismassan valmistamiseksi, revinnäismassan käyttö ja revinnäismassasta valmistettu tuote
CN100427680C (zh) * 2006-04-15 2008-10-22 永州湘江纸业有限责任公司 高温热压垫层纸及其生产方法
PT115562B (pt) 2019-06-03 2021-12-24 Raiz Instituto De Investig Da Floresta E Papel Pasta celulósica de casca de eucalyptus globulus, e seu processo de produção, para produtos de papel tissue

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2706155A (en) * 1951-10-24 1955-04-12 Camp Mfg Company Inc Absorbent paper
GB1117731A (en) * 1963-09-17 1968-06-26 Wycombe Marsh Paper Mills Ltd Two-layer paper
SE7602750L (sv) * 1975-03-03 1976-09-06 Procter & Gamble Anvendning av termomekanisk massa for framstellning av tissue med hog bulk

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
Derwent's abstract No. 84-41023/07 SU 1008324, publ. week 8407 *
Dialog Information Services, File 351, WPI 81-91, Dialog accession no. 2696010, (PAPER RES INST. et al), SU 779483, A, 801117, 8131 (Basic) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6068734A (en) * 1995-11-24 2000-05-30 Sca Hygiene Paper Ab Soft, bulky absorbent paper containing chemithermomechanical pulp

Also Published As

Publication number Publication date
FI914269A (fi) 1992-03-13
AU636059B2 (en) 1993-04-08
DE69107940D1 (de) 1995-04-13
NO913436D0 (no) 1991-09-02
AU8377591A (en) 1992-03-19
NO913436L (no) 1992-03-13
SE500524C2 (sv) 1994-07-11
FI914269A0 (fi) 1991-09-10
SE9002900L (sv) 1992-03-13
EP0478045A1 (en) 1992-04-01
ES2069819T3 (es) 1995-05-16
SE9002900D0 (sv) 1990-09-12
FI96335C (fi) 1996-06-10
NZ239562A (en) 1992-11-25
NO177938C (no) 1995-12-20
NO177938B (no) 1995-09-11
ATE119595T1 (de) 1995-03-15
DE69107940T2 (de) 1995-07-13
FI96335B (fi) 1996-02-29
CA2051218A1 (en) 1992-03-13

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