| 摘要 |
<p>In a method of rotational moulding coated granules of a first moulding material are mixed with a second moulding material preferably in powdered form. During the moulding process, the coating promotes separation of the granules from the other material before being absorbed and as a result a multi-layer moulding is produced. The granules may be of a different material from the second moulding material. Specifically, the granules may contain a foaming agent to produce a foamed layer intimately attached to the other layer.</p> |
