The stripping plate 4 is arranged between the flask 2 and pattern plate 3. The stripping plate has a recess whose contour equal those of the pattern 1. When the mold is ready the pattern is withdrawn from the mold downwards through the stripping plate, which supports the mold when the pattern is removed.
Advantages Of Air Refrigeration : 1. The refrigerant used namely air is cheap and easily available. 2. There is no danger of fire or toxic effects due to leakages. 3. The weight to ton of refrigeration ratio is less as compared to other systems. Disadvantages Of Air Refrigeration : 1. The quantity of Refrigerant used per ton of refrigeration is high as compared to other systems. 2. The COP of the system is very low. Therefore running cost is high. 3. The danger of frosting at the expander valves is more as the air contains moisture content.
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