| 摘要 |
<p>A method for rotational moulding of a cylindrical product, preferably a soft PVC plastic fender, comprising a) arranging an open-end (21,22) tubular moulding tool (20) vertically; b) inserting a prefabricated lower rope attachment section (11) into the tool (20); c) dosing a PVC-paste inside the tool (20); d) inserting a prefabricated upper rope attachment section (12) including a valve into the tool (20); e) rotating the tool (20) and placing it horizontally in a moulding apparatus (6); f) setting the tool (20) in high speed rotation until the paste is uniformly distributed on the internal tubular wall; g) reducing the speed and heating the tool (20); h) cooling the tool (20) and rotating it to a vertical position and placing it in a demoulding apparatus (7), in which a gripping tool grips the upper end section (12) of the mould product (10); i) applying vacuum by means of the valve whereby part of the surface of the mould product (10) is released from the inner mould wall; and j) rotating the mould product (10) by means of the gripping tool and pulling the moulding tool (20) downwards, whereby the mould product (10) is released.</p> |
