Forming an embossed coated substrate
The invention relates to a process of forming an embossed coated substrate. The process comprises the steps of: (I) forming on a substrate at least one coating whose composition comprises a radiation-curable polyurethane dispersion, (II) embossing the coated substrate on a relief surface, (III) irradiating the embossed coated substrate to cure the polyurethane-containing coating. An application of the process is the manufacturing of caul paper.
1 . Process of forming an embossed coated substrate comprising the steps of:
(I) forming on a substrate at least one coating whose composition comprises a radiation-curable polyurethane dispersion,
(II) embossing the coated substrate on a relief surface,
(III) irradiating the embossed coated substrate to cure the polyurethane-containing coating.
2 . Process according to claim 1 , comprising drying the coating between step (I) and (II).
3 . Process according to claim 2 , comprising drying the coating at a temperature comprised between 60 and 120° C.
4 . Process according to claim 2 , comprising drying the coating during 30 seconds to 5 minutes.
5 . Process according to claim 1 , comprising embossing the coated substrate by contact with a relief surface of a roller.
6 . Process according to claim 1 , comprising embossing the coated substrate at a temperature comprised between 60 and 220° C.
7 . Process according to claim 1 , comprising embossing the coated substrate during 1 to 20 seconds.
8 . Process according to claim 1 , comprising embossing the coated substrate with a pressure comprised between 5 and 30 kg/cm2.
9 . Process according to claim 1 , comprising forming on the substrate at least two coatings of different composition.
10 . Process according to claim 9 , wherein the upper coating of the least two coatings has a composition containing a silicone additive, preferably an acrylated silicone additive.
11 . Process according to claim 9 , wherein the upper coating of the least two coatings has a greater hardness than the lower coating.
12 . Process according to claim 1 , wherein irradiation is made with ultraviolet radiation.
13 . Process according to claim 1 , comprising an ulterior step of releasing the embossed coating from the substrate.
14 . Process according to claim 1 , wherein the embossed coating is released from the substrate and transfered to another substrate.
15 . Embossed coated substrate comprising a substrate bearing an embossed coating whose composition comprises a radiation-curable polyurethane dispersion.