Plastic article or earthenware shaping or treating: apparatus – Stock pressurizing means operably associated with downstream...
Patent
1983-04-08
1986-01-07
Thurlow, Jeffery
Plastic article or earthenware shaping or treating: apparatus
Stock pressurizing means operably associated with downstream...
264 405, 264541, 2642092, 2642098, 425141, 425146, 425149, 425166, 425532, 425381, 425466, 425467, B29D 2304
Patent
active
045631476
ABSTRACT:
A machine has a nozzle formed with an annular passage centered on an axis and having at an outer axial end an annular mouth. A plastic mass is introduced under pressure into the inner axial end of the passage at two diametrally opposite locations and mixes and passes outwardly along the passage to emerge from the mouth as a tube. The axial outward flow of the mass along the passage is impeded upstream of the mouth to pressurize the mass with a pressure substantially greater than atmospheric. Such flow is impeded either by restricting the passage or by allowing the volume of the passage to increase against a predetermined counterforce. The mass will form when it leaves the nozzle a tube of almost perfectly uniform wall thickness.
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patent: 4279857 (1981-07-01), Feuerherm
Battenfeld Maschinenfabrik GmbH
Dubno Herbert
Ross Karl F.
Thurlow Jeffery
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