Improvements in or relating to moulds

摘要: 661,780. Making moulds. SINTERED PRODUCTS, Ltd. June 21, 1950 [March 28, 1949], No. 8406/49. Class 83 (ii) and (iv). [Also in Group V] Powder metallurgy.-A porous metal mould suitable for moulding pottery articles such as egg trays made from wood fibre is by filling a master with dry powder of copper, nickel, aluminium or alloys thereof, sintering the at 800-900‹ C. reducing atmosphere, cooling while still protective atmosphere removing sintered mass mould. Uniform may be effected vibration. The partly solid to which portion joined during wholly but different compositions, example, face bronze back copper. used form finer than that backing this painting thin paste fine then coarser first layer adding thirdly, vibrating so particles between 200 250 mesh penetrate through 30 50 face. In specific containing 10 per cent weight tin consisting substantially spherical was pressed into hand cracked ammonia four hours 800‹ After stripping, polished electroplated chromium described Specification 603,762.