| 摘要 |
<p>In a method for creating a blow moulded product comprising the steps of extruding a parison tube (3) into a cavity formed between opposite halves of a mould (5), pinching off end portions of the parison via crimping apparatus (7 and 9), admitting high pressure compressed gas into the inner portion of the parison tube via a gas blow pin or needle (11) for inflating the tube against the opposite halves of the mould and thereby create the blow moulded product, the improvement comprising the steps of projecting an undercut dowel (13) from an inner wall of at least one of the opposite halves of the mould such that the parison forms around and conforms to the shape of the dowel, retracting the dowel into the wall thereby leaving an undercut in the parison in the shape of the dowel, removing the blow moulded product from the mould and inserting pin portions (19 and 21) of an appendage (17) into the undercut prior to cooling of the parison whereby the undercut shrinks around the pin portions during cooling to form a secure connection of the appendage to the product.</p> |
