Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1993-08-18
1997-11-25
Krynski, William
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428174, 428195, 428341, 428500, 428507, 428521, 4285375, 427256, B32B 300
Patent
active
056910428
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a printable marked sheet which comprises at least one pigmented coating, and more particularly a matt coating. The invention furthermore relates to the manufacturing process of such a sheet.
In the present description the terms "marked sheet" and "marked paper" refer to a sheet or paper, respectively, which has relief marks or patterns made with the aid of embossing rollers or dandy rollers, or also with the aid of marking felts, possibly whilst hot. This includes, for example, a laid paper, the wire marks having been made with the aid of a dandy roller; a grained paper, the grain having been produced by means of an embossing roller or marking felt. It may likewise include unsmoothed, so-called "rough-machined" papers which have a certain structured surface (rustic effect) caused by markings on the felt of the paper machine. It may also include, for example, a film of embossed synthetic material.
Already known, according to a prior technique, are marked papers that can be used for offset printing. These papers may be grained or laid. However, they have a very mediocre printability and are unsuitable for four-colour printing. However, such papers are interesting because they present a great diversity of appearance conferred by the marking and a great diversity of feel.
Papers are known that comprise a pigmented coating so as to give them a good printability in particular for four-colour printing.
Also known are marked papers that comprise at least one pigmented coating to make them printable. Such papers are made by forming a sheet by the wet method, i.e. using an aqueous dispersion containing cellulose fibres, possibly with other natural, mineral and/or synthetic fibres, and possibly binders, colouring agents and other additives currently used in the paper industry. The aqueous dispersion is applied onto a metal screen, squeezed and then dried. The sheet obtained in this manner is then coated by means of coaters with compounds that contain fillers (e.g. kaolin). Then the coated sheet is dried. Finally, the sheet is marked outside the machine.
Such papers, because they are marked after they have been coated, have as their main drawback that the graining operation makes the coating shiny at the places where pressure is exerted via the relief on the embossing or dandy rollers or the relief on the marking felts. Furthermore, the appearance of the paper made in this manner is reminiscent of synthetic paper and the rigidity of the paper is badly affected. These papers, therefore, have shinny and unaesthetic spots or streaks.
It is, therefore, an object of the invention to provide a marked paper which has a good printability (i.e. is coated), but which at the same time retains the rigidity of a not marked paper, of the same weight and which has a homogeneous matt appearance. It is, therefore, an object of the invention to provide a paper of the type suitable for printing and/or writing, which is matt, but at the same time marked.
Consequently, it is an object of the invention to provide a paper which combines the advantages of the two types of paper and which avoids their drawbacks: a coated paper which, therefore, has a better printability with a soft marking which ensures originality without detracting from the homogeneity of the glossiness and without affecting the rigidity.
Another object of the invention is to provide a coated grained paper which has a good rigidity and will prevent the user from buying a paper with a considerably higher weight (the choice of the weight of the paper being, in fact, often linked to the rigidity required by the user).
The applicant has made such a printable, coated, marked and matt sheet, the surface appearance of which (i.e. the mattness or the glossiness) is homogeneous and not affected by the marking, by first of all carrying out the marking of a base and by covering at least one side of this base with at least one pigmented coating.
The process for making such a sheet according to the present invention contradicts the preconceptions of the person s
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patent: 1900294 (1933-03-01), Lovatt
patent: 4957578 (1990-09-01), Huffman et al.
patent: 4986860 (1991-01-01), Akimoto et al.
JP 57 056212 Translation of patent, Apr. 1982.
World Patents Index Latest Week 8251, Sep. 24, 1971, Derwent Publications Ltd., AN 82-10862J.
Barthez Alain
Goguelin Michel
Thibierge Emeric
Arjo Wiggins S.A.
Krynski William
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