| 摘要 |
<p>Hollow bodies from thermoplastic material. Blowing method provides for a preform to be expanded in a blower mould by the introduction of a pressure medium, thus forming it into a hollow body. The pressure medium is forced into the interior of the preform, and finally a welding pressure is exerted against the excess material to weld adjacent areas, being applied across the centre-line of the hollow body.</p> |
