| 摘要 |
The invention relates to a press, comprising a steel plate (4, 5) with a thickness (d1) of between 1.0 mm and 3.0 mm and a surface roughness of between 1.0 mu m and 4.0 mu m and comprising a heating device (13, 14). Said heating device introduces heat into the plastic materials using a working plane of the steel plate (4, 5). The plate has a single-layer or multi-layer, butt-welded welding joint (17), whereby the surface (20) of said welding joint (21) is located in a concave surface which is located at a maximum normal distance, in particular, between 30 mu m and 50 mu m from the working plane (18) of the steel plate (4, 5). A surface intersection curve of the welding joint (17) and the adjacent areas of the working plane which lie on either side, is continuous with a normal plane, in relation to the working plane (18) of the steel plate (4, 5). The surface (20) of the welding joint (17) which is on the opposite side of the steel plate to the working surface, lies in a surface which is located at a maximum distance of 20 mu m from the plane (19) of the steel plate. The welding joint (17) has a minimum thickness (d2) which is at least 50 mu m lower than the (d1) of the steel plate. |
