Plastic article or earthenware shaping or treating: apparatus – Diverse distinct type shaping means – Shaping orifice and either a downstream preform reshaping...
Patent
1975-04-15
1977-04-12
Spicer, Jr., Robert L.
Plastic article or earthenware shaping or treating: apparatus
Diverse distinct type shaping means
Shaping orifice and either a downstream preform reshaping...
425369, 425387R, 425392, 425412, 425DIG54, 264 94, 264 95, B29D 2304
Patent
active
040172449
ABSTRACT:
The present invention relates to a device for shaping and cooling a smooth thin wall pipe, obtained from extrusion of a thermoplastic material, into a corrugated pipe shape.
The most common technology to produce plastic corrugated pipe uses a series of split molds carried by two continuous chains, the split molds locking around an extruded smooth pipe which by means of a slight positive pressure is forced against the inside walls of the molds (which travel at extrusion speed) therefore shaping the hot plastic pipe into a corrugated shape. At the same time excessive heat is dissipated by a forced flow of air passing over the outside surface of the molds. This system requires a great number of molds and therefore machines of great encumberance.
REFERENCES:
patent: 2708277 (1955-05-01), Holt
patent: 3222728 (1965-12-01), Roberts et al.
patent: 3346921 (1967-10-01), Bunish et al.
patent: 3558753 (1971-01-01), Edlin
patent: 3844700 (1974-10-01), Sokolow
Miller Richard L.
Spicer, Jr. Robert L.
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