Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling rate of movement of molding material or its...
Patent
1983-09-19
1986-01-14
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling rate of movement of molding material or its...
264 458, 264 465, 264 469, 264262, 425135, 425145, 425151, 425224, 425817C, B29D 2704
Patent
active
045644870
ABSTRACT:
Method and apparatus for making a continuous length of tubing having an annular wall formed of polyurethane, including a forming cylinder having a mandrel extending centrally therethrough. Two strips of paper material are pulled through the forming cylinder, one surrounding the mandrel and one being disposed at the interior surface of the cylinder, and a curable plastic mixture is injected into the annular space between the paper strips. A sensor is provided to determine the point at which curing of the plastic mixture begins in the annular spacing within the cylinder, and the speed of travel of the paper through the cylinder is regulated as a function thereof. The control system shuts the apparatus down if a break in the paper strips is detected, or if the paper supply approaches exhaustion, or if the point of full curing is within a predetermined minimum spacing from the inlet end of the cylinder. Protrusions are provided at the outlet end of the cylinder to score the outer paper layer of the tubing, and the cylinder is mounted to frame for easy removal therefrom whereby cylinders of various sizes can be used.
REFERENCES:
patent: 3754064 (1973-08-01), Snelling
patent: 3816043 (1974-06-01), Snelling
patent: 4131596 (1976-12-01), Allen
patent: 4137025 (1979-01-01), Graves
patent: 4237082 (1980-12-01), La Spisa
patent: 4405398 (1983-09-01), Rother
Anderson Philip
Lambda Corporation
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