However, this means that the ice is cold enough to condense and freeze moisture from the air and also re-freeze its own melt-water, thus forming lumps if not used quickly during periods of storage at ambient temperature. As the drum rotates, a stationary blade cracks the ice from the surfaceĪs the ice is made at -7☌, it can be stored in freezers below zero for prolonged storage. The horizontal style of drum is usually rotating, with the ice formed on the outer surface. The harvesting blade is motor driven around this surface, cracking it off. The vertical style of drum is usually stationary, with the ice formed on the inner surface. These large, flat pieces are good for layering, and are available with a single evaporator up to 50 tonnes. The ice then falls by gravity into the ice store. This ice is sub-cooled down to -7☌ in order to make it brittle, then cracked off by a harvesting blade. Made on a large vertical or horizontal drums, scale ice is formed on either the inner or outer surface of the drum by pouring a film of water over it, then contact freezing it into a thin sheet of ice. Scale ice is usually large, flat, thin pieces of ice (1-2 mm) mainly used in the commercial fishing and concrete cooling industries, typically in large quantities.
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