Die comprising small cup-type depressions
In order to produce a coating having an attractive, velvet-like or suede-like appearance for a substrate by application of a liquid plastic dispersion to the die surface 3 consisting of hydrophobic plastic and subsequent solidification of this plastic material, a die is used whose surface 3 , according to the invention, has a gloss of less than 2.2 according to DIN 67530 at an angle of incidence of 60° and is provided with microscopically small well-like indentations 4.
1. A die for the production of a coating, which can be bonded to a substrate in the form of a sheet, and is formed by application of a liquid plastic dispersion to a surface of the die, consisting of a hydrophobic, flexible plastic and subsequent solidification of the liquid plastic dispersion,
wherein a surface has a gloss of less than 2.2 according to DIN 67530 at an angle of incidence of 60° and is provided with microscopically small indentations in the form of wells which are formed by laser treatment of surface, and
wherein a center to center distance of adjacent indentations in the form of wells is from 50 μm to 150 μm and a depth of the indentations in the form of wells is from 50 μm to 150 μm.
2. The die according to claim 1 , wherein the substrate is selected from leather and textile materials.
3. The die according to claim 2 , wherein textile material is selected from nonwovens, woven fabrics and knitted fabrics.
4. The die according to claim 1 , wherein a light surface has a gloss of less than 2.2 and a dark surface has a gloss of less than 1.2.
5. The die according to claim 1 , which consists of at least two layers (1, 2), wherein an uppermost layer has the indentations which are formed from the flexible plastic.
6. The die according to claim 1 , wherein a substrate layer which consists of textile material or of paper is arranged below the uppermost layer.
7. The die according to claim 1 , wherein a layer consisting of metal is arranged below the uppermost layer.
8. The die according to claim 1 , wherein the indentations are arranged in a substrate layer which is covered by a layer forming the surface, lining the indentations and consisting of hydrophobic plastic material.
9. The die according to claim 1 , wherein the surface consists of polypropylene, silicone resin, silicone rubber or a fluoropolymer.
10. The die according to claim 1 , wherein the laser treatment of the surface is computer-controlled.
11. The die according to claim 1 , wherein the indentations are formed during the production of the die by casting from a negative mold.
12. The die according to claim 1 , wherein the indentations have a round cross section.
13. The die according to claim 1 , wherein the indentations have a cross section tapering toward the bottom thereof.
14. The die according to claim 1 , wherein the center-to-center distance of adjacent indentations is from 60 μm to 90 μm.
15. The die according to claim 1 , wherein the depth of the indentations is from 60 μm to 90 μm.
16. The die according to claim 1 , wherein a bottom of the indentations is rounded.
17. The die according to claim 1 , which is a sheet or a web.
18. A method for the production of a coating of textile material using a die according to claim 1 .
19. A method for the production of a leather film finish using a die according to claim 1 .
20. The die according to claim 1 , wherein a bottom of the indentations is concave or convex.