Ratio controlled mixing of liquids

Details Ratio controlled mixing of liquids Ratio controlled mixing of liquids

1975-08-13

1977-02-22

Reeves, Robert B.

Dispensing

Automatic control

Motor control

222134, 318 39, 318571, 425 4R, B67D 508

Patent

active

040088294

ABSTRACT:
Apparatus is described for the controlled mixing of liquids in a predetermined ratio and is especially suitable for the dispensing of predetermined ratios of polyol and polyisocyanate liquids in the liquid injection molding of polyurethane articles. The ratio control is achieved by a master-slave velocity relationship between at least two metering pumps of the plunger or piston type which are velocity coupled and inject on a common programmed velocity profile that is fed into the pump control that is the master system. Each pump control system has a velocity feedback control loop (a closed loop system) and one signal into the slave automatic control system (typically the polyol system) is obtained in a suitable ratio from the feedback master automatic control system (typically the poly isocyanate system).

REFERENCES:
patent: 2658644 (1953-11-01), Lowe
patent: 2788953 (1957-04-01), Schneider
patent: 3741441 (1973-06-01), Eberle
patent: 3908862 (1975-09-01), Chandra et al.

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