MORE ON WASHING

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Full Tank Washing

A constant feed fills the tanks full of water, which overflows to waste.

Counter-current Washes

Clean water feeds the final wash and the overflow from that tank feeds to the previous wash and so on back through the machine.

Only a single supply of clean water to the first tank is required.

This system gives great economy of water and is the most efficient as the last wash is the cleanest.

Spray washes

Spray washes consist of water sprayed onto the film as it runs through an empty tank.

This system washes well but is too often wasteful of water in badly designed systems. Spray washes are rarely used today and were mostly limited to mobile processors in ships or planes as they take up less space than a full tank and if efficiently designed use less water than a full tank.

Spray washing is usually used for colour film sound track processors.