| 摘要 |
<p>There is disclosed a method of forming plastic sheet material into articles. The sheet (28) is heated and is formed into the article in a mould (10,12). The mould parts (34,44) severe the portion of the sheet which is to be formed into the article and at the peripheral edge of the said portion the mould parts (32,40) squeeze the plastics material to cause it to flow outwardly into a bead cavity (30-42) in which the material forms into a thickened bead. </p> |
