Extrusion of hollow articles through a lubricated die

Details Extrusion of hollow articles through a lubricated die Extrusion of hollow articles through a lubricated die

1974-10-08

1976-09-14

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 98, 264 99, 264173, 264209, 264327, 4251331, 425326B, B29C 1707

Patent

active

039807444

ABSTRACT:
A method for producing hollow articles comprises extruding a thermoplastic material, initially in a molten state, through a lubricated die having a mandrel for constraining the material into a tubular shape, cooling the outer surface of the material during its passage through the die so that said material emerges therefrom as a tubular extrudate having its inner surface molten and its outer surface at a temperature below its freezing temperature, squeezing the extrudate at suitable intervals to fuse the molten inner surface together and thereby seal discrete lengths, and inflating the sealed lengths to conform to a surrounding mould to produce a shaped article.

REFERENCES:
patent: 2317687 (1943-04-01), Larchar
patent: 2902716 (1959-09-01), Colombo
patent: 3082484 (1963-03-01), Sherman
patent: 3223761 (1965-12-01), Raley
patent: 3397101 (1968-08-01), Rausing
patent: 3457337 (1969-07-01), Turner
patent: 3635624 (1972-01-01), Nakakoshi

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