The Hazelett® twin-belt caster is unique among moving mold casters in that all four mold surfaces are independent. This allows the mold surfaces to be tapered to remain in contact with the cast product as it shrinks. The high velocity, fast-film cooling water, which is continuously applied to the backside of the belt, impinges the belt at a slight angle creating a force on the belt. This force acts to press the belt against the surface of the strip or slab as it shrinks, keeping the belt in intimate contact with the product throughout the mold.

Each side of the mold is formed by an endless chain of dam blocks, which are held against the cast strip by adjustable spring-loaded guides.

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