Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1992-11-30
1995-05-30
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264 406, 26432814, B29C 4577, B29C 4578
Patent
active
054198585
ABSTRACT:
Molded articles having a constant quality can be obtained at all times irrespective of a fluctuation in resin properties (especially flowability). An output signal from an injection pressure sensor is sampled by a sampling circuit, and an injection-pressure waveform is obtained from injection-pressure data by means of a processing unit. If injection time fluctuates in the injection-pressure waveform, a constant-pressure injection process is judged to be in effect. If the maximum value of injection pressure fluctuates, then the process is judged to be a constant-speed injection process. The set temperature in a temperature setting unit is changed in dependence upon a fluctuation in injection time in the constant-pressure injection process and in dependence upon a fluctuation in the maximum value of injection pressure in the constant-speed injection process. The resin temperature is controlled by controlling heaters via temperature controllers. As a result, injection time or the maximum value of injection pressure is held substantially constant at all times, and so is the flowability of the resin.
REFERENCES:
patent: 4851170 (1989-07-01), Shimizu et al.
patent: 4889667 (1989-12-01), Kojima et al.
patent: 4968462 (1990-11-01), Hara
patent: 5030395 (1991-07-01), Kamiguchi et al.
patent: 5256345 (1993-10-01), Yokota
Hata Masaharu
Nonomura Akira
Kao Corporation
Vargot Mathieu D.
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