Decorative paper/embossing plate in which uneven structure of ve

Details Decorative paper/embossing plate in which uneven structure of ve Decorative paper/embossing plate in which uneven structure of ve

1995-11-30

1998-08-11

Loney, Donald

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428156, 428207, 428211, 4285422, 4289044, D06N 704, B32B 300

Patent

active

057925453

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to a decorative paper such as a wall-paper, etc. in which uneven patterns copying after vessel perforation of natural wooden plate are formed on the surface thereof, and an embossing plate used for mass-producing such decorative papers. In addition, this invention relates to a method and an apparatus for preparing such an embossing plate, and more particularly to a technology for preparing mask data for vessel perforation


BACKGROUND ART

Decorative papers such as wall-paper, etc. representing disposition of natural wooden plate are widely utilized as material for decorating surfaces of building material, furniture or cabinet of electrical appliance, etc. Ordinarily, on such decorative papers, patterns copying after grain of natural wooden plate are printed, and grain patterns having unevenness are formed. Grain patterns having unevenness appearing on a cutting plane (cross section) of natural wood are patterns obtained by cutting vessels inevitable for mainly conducting physiological action as plant, and cut vessel portions appear on a surface of wood as vessel perforations. Accordingly, in order to artificially represent disposition of a natural wooden plate, it is important to reproduce, as faithfully (precisely) as possible, vessel perforations existing on a surface of natural wood. For this reason, in manufacturing processes for general wall-paper, etc., an embossing plate in which vessel perforations are faithfully reproduced is prepared to carry out forming (embossing) of uneven patterns on a surface of wall paper, etc. by using such an embossing plate.
In order that vessel perforations formed (embossed) on a wall-paper are caused to look like natural grain as closely as possible, it is sufficient to prepare uneven patterns formed on an embossing plate on the basis of actual vessel perforations formed at a cross section of natural wood. For this reason, there is ordinarily employed a method of extracting patterns of grain appearing on a surface of a natural wood by the photographing method, etc. to form patterns thus extracted on an embossing plate by using photolithographic technique. Since natural timber (wood) is originally used as motif, uneven patterns formed on the embossing plate become patterns close to natural grain.
Further, as a technique for faithfully reproducing a vessel perforation shape of natural wood, there also exists so called "electroforming method") of molding a surface shape of natural wooden plate by silicon resin, etc. to prepare a mold and carrying out electric plating with respect to a matrix using the mold as an original mold then to separate a precipitated metallic layer from the matrix.
However, in the above-described conventional method for preparing a vessel perforation embossing plate by the photolithographic technique, there is the problem that information of depth of vessel perforation is not reflected. Natural vessel perforation is a perforation obtained by cutting a vessel and therefore depth varies in dependency upon respective portions within the perforation. Meanwhile, when pattern of grain appearing on a surface of natural timber is extracted by the photographic method, etc. as described above, only information relating to shape of a cut end of a vessel perforation would be extracted, and information relating to depth would be lost. For this reason, in wall-papers in which uneven pattern of grain is transferred from a conventional vessel perforation embossing plate, depths of respective vessel perforations would be inevitably substantially uniform, thus failing to faithfully reproduce disposition of natural grain. On the contrary, in accordance with the electroforming method, while a vessel perforation shape of natural wooden plate can be certainly faithfully reproduced in a manner to include a contour shape of a cut end or gradation of depth, there result, as compared to the photolithography method, increased number of steps and/or manufacturing time, and cost is also increased.


DISCLOSURE OF THE INVENTION

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REFERENCES:
patent: 4715623 (1987-12-01), Roule et al.

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