Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1975-10-17
1978-01-17
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
137224, 1374875, 264 95, 264210R, 425 72R, 425140, 425149, 4253261, B29D 722, B29D 2304
Patent
active
040692922
ABSTRACT:
A method for continuously controlling the internal bubble pressure in a tubular thermoplastic film extrusion process which comprises a pressure sensor device which feeds a signal to a pressure controller. In response to the signal the pressure controller feeds a proportional signal to an air valve member which, dependent upon the signal, either increases or decreases air flow into the bubble. A poppet valve, in direct communication with the air pressure inside the bubble, opens to rapidly exhaust air to the atmosphere when the pressure inside the bubble exceeds a set maximum.
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patent: 3821339 (1974-06-01), Johnson
Herrington F. John
Hungerford Gordon P.
Huggett Charles A.
Mobil Oil Corporation
Thurlow Jeffery R.
Tierney James D.
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