Automatic process control system for curing polymeric material

Details Automatic process control system for curing polymeric material Automatic process control system for curing polymeric material

1982-08-24

1985-01-29

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Effecting a change in a polymerization process in response...

525403, 525436, 525437, 525523, 525534, 528480, 528335, 528503, C08J 300, C08J 324

Patent

active

044966970

ABSTRACT:
This invention is directed to a method of automatically controlling curing of a thermosetting polymeric material. The method comprises the steps of (a) applying heat to the polymeric material to initiate curing; (b) measuring a selected characteristic of the polymeric material at various times during the cure cycle thereof; (c) generating a set of signals corresponding to the measurements made; (d) determining from the signals the optimum time for applying pressure to the polymeric material; and (e) automatically applying pressure to the polymeric material at the optimum time, in a closed-loop system. The selected characteristic measured may be the capacitance or the dissipation of the polymeric material. In general, the pressure is automatically applied immediately after the minimum capacitance level is reached but before hardening of the polymeric material.

REFERENCES:
patent: 2163584 (1939-06-01), Carothers
patent: 3476713 (1969-11-01), Dorsey
patent: 3503937 (1970-03-01), Allen et al.
patent: 3746693 (1973-07-01), Gupta
patent: 4399100 (1983-08-01), Zsolnay et al.

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