| 摘要 |
<p>A plastic tubular preform is extruded. The tubular preform is cut into continuous preforms within a mold (5). These are guided and formed into strip preforms inside the mold. Each has a thickness of 1 mm or more. The strips leaving the mold are largely straight, seen in cross section. In addition, after molding, the thickness is varied over the length of the preform using a wall thickness controller (6). This is achieved by sliding an adjuster across the flow direction of the preform. The diameter of the tubular preform is varied by an adapter (4) located ahead of the mold (5). The mold includes channels (26), each with an annular inlet opening (27) and a lengthy outlet opening (28). The annular inlet openings are all of the same radius. They are distributed around the circumference and are separated from each other by radial cutters (49). The run apart from the inlet- to the outlet opening. Seen in a cross section through the device, the output side channels are largely straight. Further mechanical details of the device are elaborated, in accordance with the foregoing principles. An independent claim IS INCLUDED FOR the mold used.</p> |
