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Photographic Emulsion Production

This application note provides an overview of the successful use of external gear pumps for the metering of constituents used in the production of bulk photographic emulsions.


A manufacturer of photographic emulsions, photographic film and papers, photographic glass plates and digital enlarger paper for industrial, commercial and recreational use offers years of experience in the photographic field. This manufacturer produces quality emulsions for coating onto premium black and white analogue photographic films and papers.


Photographic emulsion constituents are drawn from a process vessel into an external gear pump. The pump meters the constituents at variable flows and pressures and at constant temperature. Heating media is pumped (using a separate pump) through a double walled magnetic coupling at the rear of the pump to maintain the temperature of the pumped liquid. A PC or other controller is used to calibrate the pumps and provide feedback of actual pump speeds.


Liquiflo 31F series magnetically coupled gear pumps are direct mounted to pedestal motor mounting frames with DC permanent magnet motors with tacho feedback. The pumps are fitted with a double walled "Dual-Kan" magnet cup to allow the pumped fluid to be kept at a constant temperature.

External Gear Pump Design Smooth, pulse-free flow Easy to monitor, easy to control
Simple to service and maintain Reduced downtime and less production loss
Low shearing of pumped media Consistency of emulsion make-up is guaranteed
Magnetic Coupling Containment of pumped fluid Reduced chemical and environmental hazards - no leakage in the plant
No seals to fail Extended pump operation between servicing means reduced downtime
Leak free pumping Integrity of media and reduced risk of quality issues
Permanent Magnet DC Motors with Tacho Feedback Motor output speed can be easily adjusted and  monitored Emulsion constituents dosage can be adjusted automatically