公开(公告)号：US3902704A

公开(公告)日：1975-09-02

申请号：US43328174

申请日：1974-01-14

Applicant: FUJIKURA LTD

Inventor： ISHIBASHI MASASHI ,  SUZUKI HIDEO

IPC: H01B13/14 ,  B29B7/00 ,  B29C44/32 ,  B29C44/34 ,  B29C47/00 ,  B29C47/10 ,  B29B1/06

CPC classification number: B29C44/3449 ,  B29C44/322 ,  B29C44/3442 ,  B29C47/0014 ,  B29C47/1036 ,  B29C47/1063 ,  B29K2105/0005 ,  Y10S264/05

Abstract: In an extruder for the preparation of foamed resin insulated wires for telecommunication cables such as coaxial cables, a passage for a blowing fluid is provided to extend through the central portion of the extruder screw in the axial direction and open in the low pressure zone of the extruder, and at least one nozzle is mounted on the screw surface or the side face of the flight in the low pressure zone of the extruder to inject into and mix with into a molten resin a blowing fluid forwarded under pressure through said passage. The foamed resin insulated wires produced by the equipment have excellent electric and mechanical properties, in which the insulating resin coating has very high mechanical strength even at a very thin thickness. Further, the extrusion coating speed can be much increased when the above equipment is employed.

Abstract translation: 在用于制备用于诸如同轴电缆的通信电缆的泡沫树脂绝缘电线的挤出机中，提供用于吹塑流体的通道以沿轴向方向延伸穿过挤出机螺杆的中心部分并且在挤压机的低压区域中打开 挤出机，并且至少一个喷嘴安装在挤出机的低压区域的螺旋表面或飞行器的侧面上，以注入熔融树脂中并将其在压力下通过所述通道转运。 由该设备制造的发泡树脂绝缘电线具有优异的电气和机械性能，其中绝缘树脂涂层即使在非常薄的厚度下也具有非常高的机械强度。 此外，当使用上述设备时，挤出涂布速度可以大大增加。