Page 64 - PCMI Journal December 2020

General Overview of PCM Equipment - Wet Processing Presented by: Mike Soble, Technical Sales Manager, Chemcut Corporation, US
11/23/20
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MEDIUM CHEMICAL CLEAN:
Bath Management:
The Chemistry and Rinse water stations on MEDIUM CHEMCIAL CLEAN systems are typically operated as a “BATCH” process meaning that each chemical bath is filled with the proper concentration of the desired chemistry and operated for a specified period of time. As the period of time lapses, (daily, weekly, monthly), the bath is drained and re-filled with fresh chemistry. Rinses are often managed in the same fashion.
Alternately, the bath management can be based on the number of panels processed or the total surface area of product that has been processed. When the panel count or surface area reaches a pre-determined limit, the chemical baths are drained and re-filled with fresh chemistry.
Chemcut
MEDIUM CHEMICAL CLEAN:
The Key Parameters for MEDIUM CHEMICAL CLEAN machines are:
Ø DWELL TIME / CONVEYOR SPEED:
• Dwell time is the amount of time the product spends in each chemical bath. The chemical supplier
data sheet specifies a range of recommended DWELL times. These recommended Dwell times typically range from 30 to 60 seconds in a spraying chamber.
Ø TEMPERATURE CONTROL:
• Chemical Stations have both heating and cooling elements. As the rate of chemical reaction increases
with temperature, it is important that the temperature be maintained at the desired temperature for consistent Cleaning activity
Ø MANUAL PRESSURE CONTROL:
• Uses valves and pressure gauges to adjust upper and lower spray pressures
Ø BATH MANAGEMENT:
• Consistent chemistry replacement at the pre-determined increments are necessary to achieve
consistent Chemical Cleaning
Chemcut
Issue 136 December 2020 PCMI Journal 64
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