Plastic article or earthenware shaping or treating: apparatus – Stock pressurizing means operably associated with downstream... – Including product handling means
Patent
1977-02-24
1979-01-23
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Stock pressurizing means operably associated with downstream...
Including product handling means
425380, 425404, 425465, 425467, B29D 2304
Patent
active
041358716
ABSTRACT:
Resin tubes having thick walled portions and thin walled portions are formed by providing a specially configured orifice on an extruder and varying the rate at which the extruded resin tube is pulled from the extruder. The orifice is shaped to form a thin tubular opening and a thick tubular opening communicating with one another, the thick tubular opening being adjacent and down-stream of the thin opening. When the extruded resin tube is pulled at a high speed the thin tubular opening is filled with resin that passes through but does not fill the thick tubular opening. At the slow pulling speed the resin fills at least the open-end portion of the thick tubular opening thereby forming a thick walled portion of the resin tube.
REFERENCES:
patent: 3169272 (1965-02-01), Maxson
patent: 3176494 (1965-04-01), Cullen et al.
patent: 3587281 (1971-06-01), Lemelson
patent: 3899276 (1975-08-01), Sokolow
Kita Takeshi
Mochizuki Kiyoshi
Murai Sadao
Lazarus Richard B.
Rosenbaum Mark
Sekisui Kagaku Kogyo Kabushiki Kaisha
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