Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Reexamination Certificate
2005-09-30
2009-08-25
Heitbrink, Jill L (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
C264S328100, C425S145000
Reexamination Certificate
active
07578952
ABSTRACT:
Leak of a metered resin by backflow in injection filling is prevented not depending on reverse rotation of a screw but by closing a ring valve by controlling a screw forward movement speed in injection filling. An injection filling speed and a valve closing operation speed are set to the screw forward movement speed. The valve closing operation speed is different from an initial speed of the injection filling speed, and the operation time thereof is set to the time necessary for moving the injection screw by a distance capable of performing the valve closing after the end of metering. The valve closing is performed with the set operation speed and the set operation time.
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Dray, Robert F., “Injection Molding: A Technical Analysis of Check Valves”, Jun. 1994, Plastics Engineering, pp. 23-26.
Aruga Yoshito
Shiozawa Fumio
Yoda Hidenobu
Heitbrink Jill L
Nissei Plastic Industrial Co. Ltd.
Weingarten Schurgin, Gagnebin & Lebovici LLP
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