| 摘要 |
<p>LAMINATES OF POLYETHYLENE FOAM WITH AN ANISOTROPIC PORE STRUCTURE A process for the production of cross-linked polyethylene foam layers which have an anisotropic pore structure in at least one internal layer, wherein at least three polyethylene sheets which contain equal quantities of peroxide as crosslinking agent and differing quantities of a chemical blowing agent are arranged as a multilayer structure in such a way that the two external layers are formed by the sheets which contain a smaller proportion of blowing agent, and the structure is heated, preferably in a continuous heating furnace, so that the individual sheets are cross-linked and at the same time welded together to form a laminate which is subsequently foamed by increasing the temperature to between 190 and 250.degree.C. Le A 16 242</p> |
