Metal Finishing Guide Book

2012 Organic Finishing Guidebook Issue

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Fig. 7. Drum washer construction details. FIVE-STAGE WASHERS A five-stage monorail-type zinc phosphating machine is shown in Fig. 4. Table II pro- vides details for each stage.Table III provides similar information for the five-stage iron phosphating system pictured in Fig. 5. DRUM-TYPE WASHERS Figure 6 depicts a typical three-stage drum-type washer. Concentration details are shown in Fig.7. Table III gives further details on drum-type systems. OVENS In former years there was a tendency to over simplify oven problems. There was a widely held idea that an oven was "just a heated box" through which parts were passed to dry or bake a finish or to evaporate and remove moisture or otherwise 194

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