Programmable shot controller development
W.S. Blasnitz, Paul Simmons · OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) · 1991
A foam processor equipped with a flowmetering system has also been equipped with a computer-controlled shot dispensing system, or programmable shot controller (PSC). The addition of the PSC to the control system enables the shot size to be calculated and the timer set by the controller; it also provides a printout of assembly MC, shot size, flow rates of polyurethane components, pressures and temperatures of components, and operator clock number. The PSC will also provide checks to ensure that the mixer has been turned on, the system has been completely purged, and a waste shot has been taken prior to encapsulation of the unit. This complete process control system, of which the PSC is an integral part, will ensure that the mixed encapsulant being introduced into an assembly is correct, thereby reducing scrap of expensive final assemblies. 24 figs.