Control of pipe tension between extruder die and take-up coiler
AssigneePhillips Petroleum Company
InventorsRonald J. LaSpisa, Arthur H. McElroy
Life of this patent
Estimating the term…
Abstract
A process and apparatus for minimizing breakage and stretching during the high speed production of plastic pipe is provided wherein a pipe is extruded at a first linear rate of speed, a slack segment is established and maintained between the extruder and a pipe winder, and the pipe is taken up on the winder at a second linear rate of speed which is the same as or different from the first rate, wherein the pipe is taken up on the winder responsive to the degree of slack in the slack segment.
Claims10
Apparatus for extruding an elongated plastic pipe and for winding said pipe onto a winding roll comprising, in combination,
- (a) pipe extrusion means;
- (b) winding means comprising said winding roll, frame means for mounting said winding roll and motor means for rotating said winding roll to wind said pipe onto said winding roll;
- (c) means for establishing and maintaining a slack segment in said pipe between said extrusion means and said winding means;
- (d) sensing means for sensing the degree of slack in said slack segment;
- and
- (e) control means for actuating said motor means responsive to said sensing means.
An apparatus for maintaining a loop segment in a flexible pipe and for determining the size of said loop segment comprising:
- (a) a supporting structure;
- (b) a bracket assembly adjustably mounted upon said structure and having means for securing said bracket assembly to said structure;
- (c) sensing arm means mounted for pivotal arcuate rotation on said bracket assembly and having a first end thereof adapted for contact with said pipe to determine the immediate inner diameter of said loop;
- (d) means for maintaining said first end of said arm means in contact with said pipe;
- (e) means for generating a signal responsive to the position of said arm means;
- (f) means connecting said sensing arm means to said signal generating means;
- and
- (g) loop guide means for maintaining said loop mounted upon said supporting structure.
Dependencies are inferred from the claim text.