Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means
Patent
1975-03-24
1976-11-30
Husar, Francis S.
Plastic article or earthenware shaping or treating: apparatus
Means feeding fluent stock from plural sources to common...
Extrusion shaping means
425326R, 425369, 425396, B29D 2304
Patent
active
039946460
ABSTRACT:
An apparatus for producing a double-walled tube of plastic material having an outer corrugated wall and an inner wall connected to the inner crests of the corrugated outer wall, in which an extrusion head is arranged coaxially within mold means formed by a plurality of mold sections traveling along endless paths and abutting along portions of the paths against each other to form a tubular mold having an inner corrugated surface. The injection head comprises two coaxially arranged annular extrusion nozzles having outlet ends axially spaced from each other through which plastic material is extruded. The injection head further includes a passage for gas under pressure having a discharge end in the region of the outlet end of the first extruding nozzle for pressing, by means of the gas under pressure passing therethrough, the tubular plastic material emanating from the first extrusion nozzle against the inner corrugated surface of the tubular mold to thus form the outer corrugated wall of the double-walled tube, and means downstream of the second annular nozzle for pressing the plastic material passing therethrough and forming the inner wall of the tube against the inner crests of the corrugated outer wall.
REFERENCES:
patent: 2957201 (1960-10-01), Fields et al.
patent: 3280430 (1966-10-01), Antrobus
patent: 3677676 (1972-07-01), Hegler
patent: 3743456 (1973-07-01), Cini
patent: 3743457 (1973-07-01), Cini
patent: 3891007 (1975-06-01), Kleykamp
Frankische Isolierrohr-und Metallwaren Werke Gebr. Kirchner
Husar Francis S.
Rowold Carl
Striker Michael J.
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