Patent ID: 11945141
Assignee: COVESTRO DEUTSCHLAND AG
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 3:
4. A mold for the production of foamed areal polyurethane/polyisocyanurate moldings with a thickness (LF2), comprising:
(i) an inlet region with at least one inlet aperture (110, 210),
(ii) a cavity (100) adjacent to the inlet region, and
(iii) a depressurization unit (300) with at least one valve (130, 310), wherein
the cavity (100) has two long dimensions (LF1) and (LF3) and one dimension (LF2) that is short in comparison thereto,
the cavity (100) has at least one wall (A3) in a plane which contains the dimensions (LF1) and (LF2), or has at least one portion (K2) of a wall (A2) in the plane which contains the dimensions (LF1) and (LF3), where the at least one portion (K2) of the wall (A2) corresponds to the area which extends in the dimension (LF3) across that one-tenth part of the wall (A2) that is opposite to the inlet region, and where the at least one wall (A3) or at least one portion (K2) of a wall (A2) has at least one aperture (340) which connects the cavity (100) and the depressurization unit (300),
the ratio of the sum of the areas of the at least one aperture (340) to the area of the wall (A3) comprising said aperture or of the at least one portion (K2) of the wall (A2), where said at least one portion (K2) comprises said aperture, is 1:20 to 1:100,
the at least one aperture (340) has a length (LS1) in the direction of the long dimension (LF1) of the cavity (100), and
the ratio of the length (LS1) or, respectively, of the sum of the length (LS1) of the at least one aperture (340) to the long dimension (LF1) of the cavity (100) is greater than 1:4.