Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1987-06-17
1988-11-15
Kittle, John E.
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
428913, 428914, 156220, 156234, 156240, 156277, B32B 2700, B32B 3100
Patent
active
047849193
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel transfer paper for imparting a stereographic/pattern and a manufacturing method thereof, and further particularly pertains to transfer papers capable of imparting at low price and with ease stereographic/and perspective patterns having combinations of lusters and tones of various grades produced by way of printing and a manufacturing method thereof.
BACKGROUND TECHNIQUE
As a method of imparting stereographic/patterns on base materials formed of papers or plastic sheets, synthetic leathers, etc., embossing process has been widely practiced from old days. The general method of an embossing process is to preheat a sheet-shaped material, impress a concavo-convex pattern from a stamping roll in which the specified pattern is carved, followed by cooling, and then, take up the product.
However, the conventional embossing process involves problems such as: (1) stamping rolls on which the specified patterns are carved, equal in number to said patterns, need to be prepared, inevitably resulting in high installation cost; (2) since the luster of the embossed surface is normally uniform, it is not easy to create subtle modelings and external appearances of perspective and stereographic patterns due to grades of luster by differentiating the luster part by part; (3) under roll forming technical restrictions, the freedom of the picture pattern is naturally limited; and (4) the stamping roll needs to be replaced every time the pattern is changed, with inevitable disadvantage in work efficiency, which is fatal particularly in the case of multi-item small amount production. This invention has been reached as a result of assiduous studies carried out in an effort to solve the aforementioned problems in this technical situation.
DISCLOSURE OF THE INVENTION
A first item of this invention is a transfer paper for imparting stereographic pattern produced by transferring the specified pattern printed on a synthetic resin sheet to a release layer surface of a release paper formed of a base material and the aforementioned release layer provided thereon, and its second item is a manufacturing method of the transfer paper characterized in that a releasable thermoplastic resin is extruded between the base material and the sheet on which the specified pattern is printed, thereby transferring the pattern on the aforementioned printed sheet to the aforementioned thermoplastic resin, following by cooling, and then, said printed sheet is peeled off and separated from the surface of said thermoplastic resin. It should be noted that the word "transfer paper" also embraces sheets formed with base materials other than paper.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a schematic diagram illustrating the equipment used in Example 1.
THE MOST PREFERABLE MODE FOR EXERCISING THE INVENTION
According to this invention, on the synthetic resin sheet on which the pattern is printed, no limitation is particularly placed, except that it shall have high enough heat resistance to bear the temperature at which the pattern printed on said sheet is transferred to the release paper; for example, it includes sheets (or films) of polyesters like PBT, PET, etc., polyamides, polycarbonates, polypropylene, etc.
The base materials used for the release paper of this invention are not particularly limited, except that they shall have high enough heat resistance to bear the temperature at which the pattern transferred to said release paper is copies on the sheet like plastic sheet, etc., to which the stereographic pattern is to be imparted (hereinafter referred to as object sheet); as such materials, papers, cloths, synthetic resin sheets (films) such as of polyesters like PBT, PET, etc., polyamides, polycarbonates, polyacetals, polypropylene, metal foils and laminates of metal foils and synthetic resin sheets (films) may be mentioned. It should be noted that when, for example, paper is used as the base material, normally the weight used ranges from 110.about.150 g/m.sup.2 in the conventional embossi
REFERENCES:
patent: 4027345 (1977-06-01), Fujisawa et al.
patent: 4310370 (1982-01-01), Arai et al.
patent: 4495013 (1985-01-01), Walker et al.
patent: 4610743 (1986-09-01), Salmeen et al.
patent: 4696709 (1987-09-01), Hargarten et al.
Ohara Shuzo
Tokuno Isao
Goyo Paper Working, Ltd.
Kittle John E.
Ryan P. J.
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