Abstract: A method and apparatus for recycling gypsum board which includes grinding the raw material into chunks, crushing the material further in a rolling mill which will reduce material sizes as well as partially knock gypsum off its backing paper. Material is then screened such that only gypsum material is then deposited into a hopper prior to a mixer assembly which mixes the various sizes of recycled gypsum into a consistent mixture prior to passing such material into a roll press subsystem for densifying such material to produce material of known and uniform composition suitable for cement manufacturing. Reclaimed gypsum in this specific physical form factor may then be used in significant portions as replacement for virgin gypsum in cement manufacture. The method and apparatus are applicable to the recycling of both new and renovation gypsum-based building material.

Abstract: A modular, transportable housing for storing substrates, such as semi-conductor wafers and masks, and for maintaining such substrates in a substantially clean environment. Substrates are supported within the housing by a plurality of combs which maintain the substrates in spaced relationship relative to each other. Access to the interior of the housing is permitted by a pivotal door assembly. A docking unit permits interface of the housing with a clean environment. Control circuitry provided in the docking unit detects the presence of a housing and loads/unloads the housing as directed by a host computer through a communication link. A memory device is preferably mounted to the housing for storing history and other information about the substrates within the housing. The host computer directs the control circuitry to retrieve the substrate information from the memory and relay the information to the host computer. During or after processing of the substrates, the host computer updates the memory as desired.