Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1981-03-04
1983-02-15
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
264 469, 264508, 264565, 264155, 264173, 2642093, 264238, 4251311, 425134, 425290, 4253261, 425817C, B29D 2700, B29C 1707, B29C 1710
Patent
active
043740790
ABSTRACT:
The specification discloses an apparatus and method for concurrently manufacturing at least two semiround tubing structures. An extruder including plasticizing means for a plurality of plastic resins extrudes semiround and linear strips of plastic material in generally two back to back D-shaped sleeves. Between the D-shaped sleeves, a strip of adhesively non-compatible material is extruded so that the D-shaped sleeves may be separated. The rounded portions of the D-shaped sleeves are molded in a continuous blow molding arrangement to form the top wall of the semiround tubing. The tubing is cooled, and the two semiround tubing lengths separated from the adhesively non-compatible strip inbetween. Optionally, the base of the semiround tubing may be perforated. The two lengths of semiround tubing are folded with the base inside the top wall and coiled into large reels.
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Child, Jr. James L.
Fouss James L.
Rosenbaum Larry A.
Anderson Philip E.
Hancor, Inc.
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