Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Measuring a weight or volume
Patent
1994-09-15
1996-03-19
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Measuring a weight or volume
264 405, 264 407, 2643287, 26432811, B29C 4508, B29C 4564
Patent
active
055001661
ABSTRACT:
In an injection and compression molding process wherein molten material is fed by a screw, incorporating a counterflow preventing valve (CPV), through a flow control valve (FCV) into a mold cavity, the injection volume is controlled by:
with the FCV closed, feeding a predetermined quantity of material through the CPV into a chamber between the CPV and the FCV,
then advancing the screw with the FCV maintained closed to cause the CPV to close, thereby raising the pressure of the material in the chamber,
determining when the pressure of the material in the chamber reaches a predetermined pressure,
determining whether the movable die is at a predetermined distance from the stationary die,
opening the FCV after the pressure of the material in the chamber has reached said predetermined pressure and the movable die is at the predetermined distance from the stationary die,
setting as an original point of a determination of the injection volume either (a) a position of the screw at the opening of the FCV or (b) a time at the opening of the FCV,
injecting the material into the mold cavity while the mold cavity is open to atmospheric pressure,
closing the FCV either (a) when the screw has reached a position advanced a predetermined distance from the thus set original point or (b) at a predetermined time after the thus set original point, and
compressing the material in the mold cavity.
REFERENCES:
patent: 4932854 (1990-06-01), Matsuda et al.
patent: 5221509 (1993-06-01), Fujimoto et al.
patent: 5240398 (1993-08-01), Akaguma et al.
patent: 5258147 (1993-11-01), Yokota
patent: 5260010 (1993-11-01), Yokota
patent: 5266247 (1993-11-01), Yokota
Okubo Hideaki
Sasaki Yosuke
Kabushiki Kaisha Komatsu Seisakusho
Vargot Mathieu D.
LandOfFree
Method for controlling injection volume of material into mold does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for controlling injection volume of material into mold, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for controlling injection volume of material into mold will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1957617