EP0919664A1 - Sehr weisses, durchsichtiges oder transluzentes Papier, und Verfahren zu seiner Herstellung - Google Patents

Sehr weisses, durchsichtiges oder transluzentes Papier, und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0919664A1
EP0919664A1 EP98402983A EP98402983A EP0919664A1 EP 0919664 A1 EP0919664 A1 EP 0919664A1 EP 98402983 A EP98402983 A EP 98402983A EP 98402983 A EP98402983 A EP 98402983A EP 0919664 A1 EP0919664 A1 EP 0919664A1
Authority
EP
European Patent Office
Prior art keywords
paper
water
degree
optical brightener
paper according
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.)
Granted
Application number
EP98402983A
Other languages
English (en)
French (fr)
Other versions
EP0919664B1 (de
Inventor
Emeric Thibierge
Jean-François Loeillot
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.)
Thibierge and Comar
Original Assignee
Thibierge & Comar Sa
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=9514211&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0919664(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Thibierge & Comar Sa filed Critical Thibierge & Comar Sa
Publication of EP0919664A1 publication Critical patent/EP0919664A1/de
Application granted granted Critical
Publication of EP0919664B1 publication Critical patent/EP0919664B1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

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
    • 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
    • D21H21/14—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 function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching

Definitions

  • the present invention relates to transparent paper or translucent which is extra white.
  • This paper can be used among other things as paper for printing and / or writing.
  • One such method is the method traditional to obtain a transparent or translucent paper which is used by architects or designers to reproduce a original drawing.
  • This paper has a grayish color and is not perfectly White.
  • the grayish color is due to the fact that the fiber pulp is refined to the extreme to obtain many fibrils. It happens therefore an extreme friction between the metal faces of the refiner and the fibers, which gives the greyish color to the tracing paper.
  • Tracing papers of the prior art must have high transparency to allow the reproduction of drawings or plans. However, their whiteness is not an essential characteristic. because they are used as a means of reproduction and therefore they constitute a temporary support of a drawing which will be transferred to a other paper.
  • diazo paper which contains compounds colorless which become colored under the action of ultraviolet rays and a developer based on ammonia.
  • We place the tracing paper with the plans or the drawings on this diazo paper we illuminate by UV, which forms a latent image on diazo paper, this latent image exactly matching the drawings or plans drawn on the paper layer. Then, the latent image is revealed on the diazo paper by means of a developer based on ammonia.
  • tracing paper absolutely must not include in its composition products likely to interfere with ultraviolet rays.
  • Tracing papers of the prior art must meet strict standards in this which concerns their composition and must not contain brighteners optical.
  • the object of the present invention is to provide transparent paper or translucent having a high whiteness, namely greater than that of traditional layer of grayish color.
  • the object of the present invention is to provide such paper transparent or translucent having a high whiteness, and usable as paper for printing and / or writing, this paper not being intended for the reproduction of plans or drawings.
  • the inventors have produced transparent paper or translucent which in its composition is different from a tracing paper traditional, that is to say which contains compounds which do not enter the composition of traditional tracing papers.
  • optical brighteners are products intended to increase the whiteness of papers non-transparent printing and / or writing.
  • the inventors therefore made multiple attempts to obtain a high whiteness transparent paper. They compared the paper transparent to a glass plate and hypothesized that by opacifying a transparent glass you can create a whiteness support.
  • the inventors therefore reduced the transparency of the paper so that this one has a degree of transparency lower than the degree of transparency traditional tracing paper.
  • the inventors therefore introduced into the composition of the paper constituents reducing the transparency of the paper, namely opacifiers.
  • Another way to reduce the transparency of the paper is to less refine fibers, which reduces graying. We thus obtains a less transparent and less gray paper than a paper traditional tracing.
  • the invention therefore relates to printing and / or writing paper, transparent or translucent, characterized in that it has a degree of transparency lower than the transparency of a traditional layer and a degree of whiteness greater than the degree of whiteness of a layer traditional and in that it comprises at least one optical brightener.
  • the paper according to the invention is not intended for the reproduction of plans or drawings, but is intended in particular for printing and / or writing. It can also be used for printing interleaf sheets in sheets advertising or presentation, etc. or as decoration paper used for its light transparency properties.
  • the paper according to the invention is such that it comprises an opacifier chosen from the group formed by opaque mineral or organic fillers, such as for example TiO 2 , CaCO 3 , talc, kaolin, crushed melamine-formaldehyde resins, of the PERGOPAK type (registered trademark and available from Martinswerke, Germany).
  • an opacifier chosen from the group formed by opaque mineral or organic fillers, such as for example TiO 2 , CaCO 3 , talc, kaolin, crushed melamine-formaldehyde resins, of the PERGOPAK type (registered trademark and available from Martinswerke, Germany).
  • the paper of the invention is made from less refined fibers than what is considered necessary to obtain a traditional tracing paper.
  • the paper according to the invention contains from 0 to 10% of opacifier and less than 10% optical brightener.
  • Optical brighteners are derivatives of stilbene, for example brighteners such as LEUCOPHOR (registered trademark of SANDOZ) or BLANKOPHOR (registered trademark of BAYER).
  • LEUCOPHOR registered trademark of SANDOZ
  • BLANKOPHOR registered trademark of BAYER
  • the invention further relates to a method of manufacturing such a paper.
  • a paste is suspended in water. weakly refined paper, the suspension of fibers is deposited on a flat table of a paper machine to form a sheet, we remove water by gravity then the sheet obtained is dried between rollers dryers and finally a solution of at least one brightener is deposited optical on the surface of the sheet, for example by means of a size-press.
  • the optical brightener can be introduced in bulk or at the surface.
  • the inventors have in fact observed that the refining of the dough, even if it is lower than the refining usually carried out for a paper traditional layer, allows excellent fixation of the brightener on cellulose fibers, which allows its mass introduction, and this, preferably just before the headbox. This reduces pollution of the paper machine.
  • Fiber is suspended in water in a pulper of pulp from softwoods, and they are refined in a refiner.
  • the temperature of the aqueous suspension of fibers at a temperature of 80-100 ° C.
  • drop the suspension aqueous fibers on the canvas of a flat table paper machine we removes water by gravity.
  • the relatively high temperature of the aqueous suspension is necessary to remove water by gravity, fibers with a great affinity for water, due to the presence of many fibrils.
  • the sheet is then dried between drying rollers.
  • We then obtains a traditional transparent tracing paper We note its degree transparency to the naked eye and we give it a rating of 10. This tracing paper is grayish in color.
  • Paper is prepared in the same manner as in Example 2, but the fibers are refined less. We note its degree of whiteness and its degree of transparency. This paper is much less transparent than tracing paper according to Comparative Example 1, and much whiter.

Landscapes

  • Paper (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
EP98402983A 1997-11-29 1998-11-28 Sehr weisses, durchsichtiges oder transluzentes Papier, und Verfahren zu seiner Herstellung Revoked EP0919664B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9715363 1997-11-29
FR9715363A FR2771758B1 (fr) 1997-11-29 1997-11-29 Papier transparent ou translucide extra blanc et son procede de fabrication

Publications (2)

Publication Number Publication Date
EP0919664A1 true EP0919664A1 (de) 1999-06-02
EP0919664B1 EP0919664B1 (de) 2006-06-28

Family

ID=9514211

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98402983A Revoked EP0919664B1 (de) 1997-11-29 1998-11-28 Sehr weisses, durchsichtiges oder transluzentes Papier, und Verfahren zu seiner Herstellung

Country Status (5)

Country Link
EP (1) EP0919664B1 (de)
AT (1) ATE331840T1 (de)
DE (1) DE69835067T2 (de)
ES (1) ES2267173T3 (de)
FR (1) FR2771758B1 (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1369202A (en) * 1971-08-10 1974-10-02 Ciba Geigy Ag Optical brightening of paper
FR2348317A1 (fr) * 1976-04-14 1977-11-10 Ciba Geigy Ag Procede pour l'azurage optique du papier
US4210488A (en) * 1977-10-13 1980-07-01 Reuss Peter J Process for improving the dry strength of paper and for improving the effect of optical brighteners in the preparation or coating of paper
FR2660944A1 (fr) * 1990-04-11 1991-10-18 Sigma Prodotti Chimici Srl Composition de couchage pour papier avec azurant optique.
EP0712960A1 (de) * 1994-11-04 1996-05-22 Ciba-Geigy Ag Zubereitung eines fluoreszierenden Weisstöners

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1369202A (en) * 1971-08-10 1974-10-02 Ciba Geigy Ag Optical brightening of paper
FR2348317A1 (fr) * 1976-04-14 1977-11-10 Ciba Geigy Ag Procede pour l'azurage optique du papier
US4210488A (en) * 1977-10-13 1980-07-01 Reuss Peter J Process for improving the dry strength of paper and for improving the effect of optical brighteners in the preparation or coating of paper
FR2660944A1 (fr) * 1990-04-11 1991-10-18 Sigma Prodotti Chimici Srl Composition de couchage pour papier avec azurant optique.
EP0712960A1 (de) * 1994-11-04 1996-05-22 Ciba-Geigy Ag Zubereitung eines fluoreszierenden Weisstöners

Also Published As

Publication number Publication date
FR2771758A1 (fr) 1999-06-04
EP0919664B1 (de) 2006-06-28
DE69835067T2 (de) 2007-05-16
ES2267173T3 (es) 2007-03-01
FR2771758B1 (fr) 2000-01-21
DE69835067D1 (de) 2006-08-10
ATE331840T1 (de) 2006-07-15

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