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公开(公告)号:US4462779A
公开(公告)日:1984-07-31
申请号:US377058
申请日:1982-05-11
CPC分类号: B29C55/28 , B31B1/00 , B31B2201/287
摘要: To maintain an air or gas bubble forming in a moving tube of plastics material between pairs of squeeze rollers, an air or gas injecting needle is mounted to pivot substantially in a plane containing the centerline of the tube. The needle pierces the tube wall of the bubble when in one rotary position, moves with the tube while pivoting through an arc depending on the depth of needle penetration and is withdrawn from the bubble in a second rotary position.
摘要翻译: 为了保持塑料材料在挤压辊对之间的运动管中形成的空气或气泡,安装空气或气体注射针,以便基本上在包含管的中心线的平面中枢转。 针在一个旋转位置时,针刺穿气泡的管壁,随着针头的穿透深度而通过弧线而转动,并在第二旋转位置从气泡中取出。