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
1986-11-21
1989-05-23
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
425149, 425150, 425162, 425593, B29C 4566
Patent
active
048328847
ABSTRACT:
When the mold of plastic injection molding machine is locked, the closing force (K) is measured at the knuckle joint system during a predetermined number of operating cycles (Z). A mean value is computed from these actual value measurements (Si) and if it is within a predetermined tolerance zone (T) around a set-point value (So), no control intervention takes place. But if this mean value is outside of the tolerance zone (T) but in a control zone (R) limited by alarm limits (A), a control intervention takes place by stepwise changing the installed height of the mold until the actual value measured after each operating cycle is again within the tolerance zone (T). The measurement is repeated over another operating period (B); if those measurements stay within the control zone (R), a new mean value is computed only at the end of this operating period and a corresponding decision is made whether or not a control intervention should take place.
REFERENCES:
patent: 3642405 (1972-02-01), Eggenberger et al.
patent: 3795916 (1974-03-01), Wallace et al.
patent: 4060362 (1977-11-01), Wilson, III
patent: 4297901 (1981-11-01), Stroup et al.
Speck Ruedi
Weinmann Robert
Heitbrink Jill L.
Netstal-Maschinen AG
Silbaugh Jan H.
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