| abstract |
The invention relates to a method and a system for producing a needle of plastic, as well as a needle of plastic, in particular a needle for medical purposes. The method is for producing a plastic needle, which needle has two ends, wherein a least the outer diameter of one end is less than 0,50 mm, in a moulding sysem having an assembly comprising a feed system and a mould caviy. A melt of plastic is introduced into the feed system, increasing the melt pressure gradually during melt passage through the feed system, and then passed into the mould cavity. By gradually increasing the pressure through the feed system it is possible to meet the specific pressure demands at the entrance of the mould cavity in order to mould the thin and elongated articles in spite of the small shot volume. <IMAGE> |