Method of and apparatus for extrusion-molding a laminated pariso

Details Method of and apparatus for extrusion-molding a laminated pariso Method of and apparatus for extrusion-molding a laminated pariso

1995-12-15

1997-12-30

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

26417128, 26417315, 4251331, 425532, 425462, B29C 4726, B29C 4922

Patent

active

057026645

ABSTRACT:
An extrusion molding apparatus includes a die head with first, second, third and fourth annular nozzles. An adhesive extruder is connected to the first and third nozzles, a barrier extruder is connected to the second nozzle and a reclaimed material extruder is connected to the fourth nozzle. Inner and outer main material flow passages are connected to a main material extruder, as well. The annular nozzles and the main material flow passages are connected to an extrusion nozzle for forming a parison. The barrier material extruder has a cylinder which is connected to the second nozzle. A screw lies within the cylinder. The second nozzle has a ridge opposite an end of the screw, for dividing the extruded barrier flow material, mitigating stagnation of the barrier material as it passes through the second nozzle. A method of forming a parison is described, as well.

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patent: 5230935 (1993-07-01), Delimoy et al.
patent: 5443874 (1995-08-01), Tachi et al.

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