Coated paper sheet embossed with a diffraction or holographic pattern
First Claim
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1. Decorative embossed sheeting comprising:
- a paper substrate;
a metallized layer upon said paper substrate; and
a transparent thermoplastic coating upon said metallized layer, wherein said transparent thermoplastic coating at its side facing away from the paper substrate is embossed with a diffraction or holographic pattern the depth of which is less than the surface roughness of the paper substrate before embossment, and wherein the embossed pattern was produced on the thermoplastic coating by heating the coating to a temperature above its softening point and contacting the coating with an embossing member maintained at a temperature below the softening temperature of the coating.
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Abstract
A decorative substrate consisting of a paper base sheet coated with a thermoplastic material, involving a novel technique for coating and embossing the substrate. The paper sheeting is supplied with a thermoplastic material, as by coating or extrusion. The coated sheet is heated to adequately soften the coating, such as by use of a heated cylinder, and remote heat sources such as infrared heaters. The softened sheet surface is then decorated using an embossing member, to provide a diffraction pattern or hologram. Use of an embossment pattern of lesser depth than the surface roughness of the sheet before embossing provides attractive decorative patterns.
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Citations
18 Claims
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1. Decorative embossed sheeting comprising:
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a paper substrate; a metallized layer upon said paper substrate; and a transparent thermoplastic coating upon said metallized layer, wherein said transparent thermoplastic coating at its side facing away from the paper substrate is embossed with a diffraction or holographic pattern the depth of which is less than the surface roughness of the paper substrate before embossment, and wherein the embossed pattern was produced on the thermoplastic coating by heating the coating to a temperature above its softening point and contacting the coating with an embossing member maintained at a temperature below the softening temperature of the coating. - View Dependent Claims (2, 3, 4, 5)
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6. Decorate embossed sheeting comprising:
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a paper substrate; a thermoplastic coating upon said paper substrate, wherein said thermoplastic coating is embossed with a diffraction or holographic pattern the depth of which is less than the surface roughness of the paper substrate before embossment, and wherein the embossed pattern was produced on the thermoplastic coating by heating the coating to a temperature above its softening point and contacting the coating with an embossing roller maintained at a temperature below the softening temperature of the coating; and a hydroxylated polysiloxane release agent in said thermoplastic coating, to increase resistance to sticking at relatively high embossing speeds. - View Dependent Claims (7, 8, 9, 10, 11)
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12. Decorative embossed sheeting comprising:
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a paper substrate; a thermoplastic coating upon said paper substrate, wherein said thermoplastic coating is embossed with a diffraction or holographic pattern the depth of which is less than the surface roughness of the paper substrate before embossment, and wherein the embossed pattern was produced on the thermoplastic coating by heating the coating to a temperature above its softening point, and contacting the coating with an embossing roller maintained at a temperature below the softening temperature of the coating at an embossing speed of at least 100 feet per minute; a release agent in said thermoplastic coating, to increase resistance to sticking at relatively high embossing speeds; and a metallized layer over said embossed thermoplastic coating, wherein said release agent permits the application of said metallized layer without substantially impairing its adhesion to the thermoplastic coating. - View Dependent Claims (13, 14, 15, 16, 17)
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18. Decorative embossed sheeting comprising:
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a paper substrate; a thermoplastic coating upon said paper substrate, wherein said thermoplastic coating is embossed with a diffraction or holographic pattern the depth of which is less than the surface roughness of the paper substrate before embossment, and wherein the embossed pattern was produced on the thermoplastic coating by heating the coating to a temperature above its softening point, and contacting the coating with an embossing roller having a patterned plastic film at its surface, said embossing roll being maintained at a temperature below the softening temperature of the coating and being operated at an embossing speed of greater than 100 feet per minute; and a release agent in said thermoplastic coating, to increase resistance to sticking to said patterned plastic film at relatively high embossing speeds.
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Specification