Patent ID: 11959286
Assignee: UNILIN BV
Field: Other special machines (Mechanical engineering)
Classification: CPC E  B | IPC B  E

Claim 1:
2. The method of claim 1, wherein
said double belt press comprises the following successive zones:
(i) a spreading zone for spreading the at least one layer of foamable polymer powder on the lower of the two conveyor belts;
(ii) a heating zone for heating the at least one layer of foamable polymer powder;
(iii) said forming zone;
(iv) a cooling zone for cooling the substrate formed;

said method further comprising
heating the layers in the heating zone, then
transforming the at least two layers of polymer powder in the forming zone into a polymer substrate comprising a foamed layer of polymer, and
cooling the foamed polymer substrate in the cooling zone;
wherein the foamable polymer powder foams at least partially in the forming zone, the sum of the thicknesses of the two conveyor belts and the total thickness of the layers at the entrance of the steel belt press is less than or equal to the opening of the steel belt press at the entrance of the steel belt press, and wherein the sum of the thicknesses of the two conveyor belts and the total thickness of the substrate at the outlet of the steel belt press
is equal to the opening of the steel belt press at the outlet of the steel belt press and
is greater than the sum of the thicknesses of the two conveyor belts and the total thickness of the layers at the entrance of the steel belt press.