Cores and moulds prepn. - by pneumatic conveying of sand with admixture of resin binder and catalyst hardener

摘要

Cores or moulds for foundries are produced, by injecting a moulding material, mixed with a binder, by compressed gas into a core or moulding box. The moulding material is conveyed pneumatically through a hose, finely dispersed, to a nozzle. The two-component binder is mixed with the moulding material by adding a catalyst hardener upstream and a liq. resin (furan resin) immediately before the nozzle. This system requires a min. of appts. for an effective core and mould prodn.