Model TS

Water Cycle

The TFR module utilizes an efficient method of water circulation and conservation, the counter-cascade principle. What this means is that the water in the system is used over and over with the dirtiest of this water being the first to contact the board as it enters the system, carrying away with it the bulk of the material needing removal. As the board continues through the system, it encounters progressively cleaner water, with the final rinse being composed solely of fresh water.

The effects of this are twofold; first, the amount of water used is reduced dramatically, and second, processing of the waste water can be done more efficiently.

Applied to the TFR module, the counter-cascade principal would function as follows: Fresh water, preferably warm water (135 degrees F. maximum), is introduced into the fresh water rinse manifolds and is drawn into the secondary sump for reuse in the secondary rinse manifolds. The excess water and foam from the secondary sump cascades over a weir into the primary sump where it is circulated through the primary rinse manifolds. An additional weir in the primary sump allows the foam to cascade into the foam overflow chamber while the excess water flows into a standpipe to drainage.

This water cycle provides a viable method of reducing the running costs of the system while at the same time preserving and maintaining the best possible process conditions.

Brush Mechanism

Each of the sumps is equipped with a worm driven brush mechanism which simultaneously scrubs both surfaces of the circuit board. The brushes themselves are made of polypropylene bristles and run at a speed of approximately 170 rpm. This makes the surface contact speed approximately 122 feet per minute (378 in/in). Both the brushes and the circuit boards are continually sprayed with water to enhance the cleaning ability of the system.

Both of the brush mechanisms operate independently of each other They are adjustable so that a variety of board thicknesses or scrubbing pressures can be used. Adjustment is facilitated through the use of digital readout meters located on the control panel which show the current percentage of the maximum load on the brush motors.

Pumps

The TFR module uses two 60 GPM, centrifugal style pumps made of polypropylene and #316 stainless steel, two materials highly resistant to corrosion. For the protection of each pump motor there is a slinger washer on the pump shaft which prevents fluid from creeping up. There is also a low fluid level control which deactivates the pump (and heaters if present) in the event the fluid level falls below the recommended minimum.

Construction

The TFR system features 1/2 polypropylene construction with type 316 stainless steel utilized wherever metal parts are required. The brush mechanisms feature bronze shaft bearings.
 

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[ Talus Flux RMS ]

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