Co-extrusion of ABS/polystyrene multiple-layered sheeting

Details Co-extrusion of ABS/polystyrene multiple-layered sheeting Co-extrusion of ABS/polystyrene multiple-layered sheeting

1976-12-20

1978-07-11

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

15624411, 264171, 428500, 428515, B29F 310

Patent

active

041002377

ABSTRACT:
A process is disclosed for producing composite sheeting of polystyrene having a thin protective layer of ABS polymer. The process comprises joining a molten stream of each polymeric material in a single extruder discharge conduit such that there is produced a single molten stream having a reasonably well defined interface between the two types of polymeric material, and thereafter, passing the resulting single stream of material through a sheet-form extrusion die having its die lips generally aligned with the foregoing interface.

REFERENCES:
patent: 3476627 (1969-11-01), Squires
patent: 3524795 (1970-08-01), Peterson
patent: 3589976 (1971-06-01), Erb
patent: 3769380 (1973-10-01), Wiley
patent: 3798103 (1974-03-01), Gaunt
patent: 3823211 (1974-07-01), Colombo
patent: 3833704 (1974-09-01), Nissel
patent: 3882219 (1975-05-01), Wiley

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