Mechanical embossing texture differentiation between chemically restricted areas and non-restricted areas
View Patent ↗Disclosed is a method of manufacturing a mechanically and chemically embossed surface covering having selectively textured surfaces. The method includes forming a web coated with a wear layer. The coated web is heated to a temperature at which the wear layer is cured, the foam layer expands, and the pattern is chemically embossed to form a surface covering having foamed regions and nonfoamed regions. The temperature gradient of the surface covering is adjusted such that there is a temperature gradient difference between the foamed and nonfoamed regions. A surface texture is then mechanically embossed into the wear layer and selectively set onto the wear layer substantially overlying the non-foamed regions.
1. A method of manufacturing an embossed surface covering comprising:
forming a surface covering comprising a wear layer overlying a foam layer, said foam layer having a foamed region and a substantially non-foamed region;
adjusting the temperature of the formed surface covering such that a temperature gradient exists laterally across the wear layer between the region of the wear layer substantially overlying the foamed region and the region of the wear layer substantially overlying the non-foamed region; and
thereafter, mechanically embossing the wear layer whereby a surface texture is set predominantly into the wear layer substantially overlying the non-foamed region.
2. The method of claim 1 , wherein the foamed region and non-foamed region are selectively disposed in accordance with a predetermined pattern.
3. The method of claim 1 , wherein the surface covering further comprises a substrate underlying the foam layer and a chemical foaming inhibitor or activator is selectively disposed proximate the foam layer.
4. The method of claim 1 , wherein the surface temperature of the wear layer substantially overlying the non-foamed region is higher than the surface temperature of the wear layer substantially overlying the foamed region prior to the mechanical embossing step.
5. The method of claim 1 , wherein the surface covering has a back-side opposite the wear layer and the surface temperature of the back-side of the surface covering is higher than the surface temperature of the wear layer prior to the mechanical embossing step.
6. The method of claim 5 , wherein heat is applied to the back-side of the surface covering to adjust the temperature gradient.
7. The method of claim 6 , wherein the back-side of the surface covering is heated with a heated drum.
8. The method of claim 6 , wherein the back-side of the surface covering is heated such that the wear layer substantially overlying the non-foamed region is substantially fluid and the wear layer substantially overlying the foamed region is not substantially fluid.
9. The method of claim 1 , wherein the temperature gradient is adjusted by tempering the surface covering before the mechanical embossing step.
10. The method of claim 9 , wherein the surface covering is tempered with a smooth surfaced roll.
11. The method of claim 10 , wherein the smooth surfaced roll engages the wear layer predominantly overlying only the foamed region of the surface covering.
12. The method of claim 1 , wherein the surface covering is cooled to ambient temperature before adjusting the temperature gradient.
13. The method of claim 1 , further including heating the wear layer of the surface covering before the mechanical embossing step.
14. The method of claim 1 , further comprising mechanically embossing a surface texture into the wear layer predominantly overlying the foamed region such that the set surface texture overlying the foamed region is different than the set surface texture overlying the non-foamed region.
15. The method of claim 14 , wherein surface texture is set into the wear layer overlying the foamed region to a lesser extent than the surface texture set into the wear layer overlying the non-foamed region.
16. The method of claim 14 , wherein the surface texture is achieved with an embossing tool having a plurality of regions of different texture.
17. The method of claim 14 , wherein a surface texture is mechanically embossed into the wear layer substantially overlying the foamed region and into the wear layer substantially overlying the non-foamed region in separate processing steps and wherein a first temperature gradient is established prior to a first mechanical embossing step and a second temperature gradient is established prior to a second mechanical embossing step.
18. The method of claim 3 , wherein the substrate further comprises a melt processed resin layer.
19. The method of claim 18 , wherein the melt processed resin layer is hot melt calendered.
20. The method of claim 18 , wherein the melt processed resin layer comprises a resin selected from the group consisting of polyvinyl chloride, polyethylene, polypropylene, polystyrene, metallocene polyolefin, and copolymers thereof.
21. The method of claim 1 , wherein the wear layer is a plastisol or an organosol composition comprising a resin selected from the group consisting of a homopolymer of polyvinyl chloride, a copolymer of polyvinyl chloride, and combinations thereof.
22. The method of claim 1 , wherein the wear layer comprises a melt processed resin layer.
23. The method of claim 22 , wherein the melt processed resin layer comprises a resin selected from the group consisting of a polyvinyl chloride homopolymer, a polyvinyl chloride copolymer, a polyamide, a polyester, a polyolefin homopolymer, a polyolefin copolymer, an acrylic resin, and combinations thereof.
24. The method of claim 1 , wherein the foam layer comprises a plastisol or organosol composition comprising a resin selected from the group consisting of a homopolymer of polyvinyl chloride, a copolymer of polyvinyl chloride, and combinations thereof.
25. The method of claim 1 , wherein the foam layer comprises a melt processed resin.
26. The method of claim 25 , wherein the melt processed resin layer comprises a resin selected from the group consisting of a polyvinyl chloride homopolymer, a polyvinyl chloride copolymer, a polyamide, a polyester, a polyolefin homopolymer, a polyolefin copolymer, an acrylic resin, and combinations thereof.
27. The method of claim 1 , wherein the wear layer substantially overlying the non-foamed region has a lower gloss value than the gloss value of the wear layer substantially overlying the foamed region.
28. The method as in any one of the preceding claims, wherein the wear layer is a composite layer comprising a plurality of strata and wherein the uppermost strata comprises a topcoat.
29. The method of claim 2 , wherein the wear layer is a composite layer comprising a plurality of strata and wherein the uppermost strata comprises a topcoat; and
wherein the topcoat comprises a cross-linked resinous composition.
30. A method of manufacturing an embossed surface covering comprising:
forming a web comprising a substrate, a foamable layer, and at least one chemical foaming inhibitor or activator composition disposed proximate the foamable layer in accordance with a predetermined pattern;
coating the web with a composite wear layer comprising a plurality of strata including an uppermost strata comprising a cross-linkable topcoat;
heating the composite wear layer coated web to a temperature at which the wear layer is cured and the foamable layer is selectively expanded such that the foamable layer forms a foam layer having a foamed region and a substantially non-foamed region in accordance with the predetermined pattern;
adjusting the temperature of the wear layer coated expanded web such that a temperature gradient exists laterally across the wear layer between the region of the wear layer substantially overlying the foamed region and the region of the wear layer substantially overlying the non-foamed region; and
thereafter, mechanically embossing the wear layer whereby a surface texture is set predominantly into the wear layer substantially overlying the non-foamed region.