| 摘要 |
<p>One or more hollow sections moulded integrally with the main body of a rotational moulding are partly delimited by a section of the main mould wall and partly by a subsidiary mould wall attached to the main wall, the two walls between them defining the closed section, with a small gap between the two to allow entry of moulding material. Rotational moulding is extended to cover e.g. boat hulls with floats, reinforced cisterns and tanks. The second mould wall may be separable or may eventually be used as reinforcement of a hollow section.</p> |
