公开(公告)号：US3606670A

公开(公告)日：1971-09-21

申请号：US3606670D

申请日：1968-10-02

Applicant: DYNAMIT NOBEL AG

Inventor： WIENAND MICHAEL ,  JENSEN KLAUS ,  PRIMESSING FRANZ ,  ALFTER FRANZ WERNER

IPC: B29C65/00 ,  B29C53/00 ,  B29C53/62 ,  B29C53/72 ,  B29C53/78 ,  B29C53/84 ,  B29C65/10 ,  B29C65/48 ,  B29C65/50 ,  B29C65/52 ,  B29C65/56 ,  B29C65/58 ,  B29D23/00 ,  B29L23/00 ,  B65H81/08 ,  F16L9/16 ,  B23P11/02

CPC classification number: B29C66/0244 ,  B29C53/78 ,  B29C65/10 ,  B29C65/103 ,  B29C65/48 ,  B29C65/4895 ,  B29C65/56 ,  B29C65/568 ,  B29C65/58 ,  B29C66/0242 ,  B29C66/12421 ,  B29C66/12423 ,  B29C66/12441 ,  B29C66/12461 ,  B29C66/12469 ,  B29C66/4322 ,  B29C66/4329 ,  B29C66/49 ,  B29C66/71 ,  B29C66/73921 ,  B29C66/81423 ,  B29C66/83413 ,  B65H81/08 ,  F16L9/16 ,  Y10T29/4987 ,  Y10T29/49876 ,  Y10T29/53657 ,  B29K2027/06

Abstract: A PIPE IS CONTINUOUSLY FORMED BY SPIRALLY WINDING A BAND ONTO THE CYLINDRICAL PORTION OF A MANDREL AFTER THE BAND EXITS FROM A SYNTHETIC MATERIAL EXTRUDING MACHINE WHILE STILL THERMOELASTIC OR AFTER A PREFORMED BAND IS PASSED THROUGH THE SUITABLE HEATING DEVICE. ONE LONGITUDINAL EDGE OF THE BAND IS PROVIDED WITH A RADIALLY OUTWARDLY WIDENING TONGUE AND THE OTHER LONGITUDINAL EDGE OF THE BAND IS PROVIDED WITH A RADIALLY INWARDLY WIDENING CHANNEL. IN FORMING THE PIPE, THE TONGUE IS COOLED TO BE RIGID AND INSERTED INTO THE THERMOELASTICALLY HEATED CHANNEL OF AN ADJACENT LAP OF THE SPIRALLY WOUND BAND.