Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting
Patent
1990-10-10
1991-05-21
Heitbrink, Jill L.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
264 406, 425135, 425144, 425149, 425170, B29C 4577, B29C 4578
Patent
active
050173154
ABSTRACT:
The quality that is good or bad of an injection molded product is judged. The temperature T of a metal mold, of a resin in the mold cavity, barrel or nozzle of an injection molding machine is measured at a time t elapsed after comencement of a pressure holding step of the injection molding machine. The present P of resin in the mold cavity or barrel or nozzle is measured at the time t, and a time function A=f(t) is calculated using the temperature T and the pressure P, where A represents a calculating parameter T/P, P/T, T.times.P, T+P or T.+-.P. This is compared with a reference time function Ao=f(t) of a shot in which satisfactory products can be obtained, with a time function An=f(t) of another shot.
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Heitbrink Jill L.
Toshiba Kikai Kabushiki Kaisha
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