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    • 10. 发明授权
    • Manufacture of plastic film
    • 塑料薄膜的制造
    • US3714309A
    • 1973-01-30
    • US3714309D
    • 1970-08-11
    • GEN ENGINEERING CO
    • BIGLANO B
    • B29C47/00B29C47/88B29C17/04B29C25/00B29D7/24
    • B29C47/883B29C47/0026B29C47/0057B29C47/902B29C2947/92514B29C2947/92619B29C2947/92647
    • A method of forming an extruded tube of plastic material comprising extruding the material in a semimolten state as a tubular film, having a wall of greater thickness than that of the finished tube, locating a former within the tube near the extrusion point, passing the film over the face of the former in close proximity thereto, at least part of the freeze zone of the film being between the plane of the maximum diameter of the former and the downstream end thereof, directing a high velocity stream of air against the inner face of said film at said former at a velocity at least as high as the point of resonance at said freeze zone to provide a skin sufficient to prevent actual contact between the film and former. The diameter of the tube being extruded can be varied by varying the diameter of the former. In order to obtain still greater speeds of extrusion, external cooling can be applied.
    • 一种形成塑料材料的挤出管的方法,包括将半成品状态的材料挤出为管状膜,其具有比成品管厚度更大的壁厚度,将成型体定位在管内靠近挤出点的位置,使膜 在前者紧邻的表面上,膜的冻结区域的至少一部分在前者的最大直径的平面与其下游端之间,将高速气流引导到 所述膜在所述前体处至少与所述冷冻区的共振点一样高的速度以提供足以防止膜和前体之间的实际接触的皮肤。 被挤出的管的直径可以通过改变前者的直径来改变。 为了获得更高的挤出速度,可以施加外部冷却。