PRODUCTION OF SHAPED ARTICLES

专利名称：PRODUCTION OF SHAPED ARTICLES发明人：HILLIER E,GB,HOLMES A,GB申请号：US13887271申请日：19710430公开号：US3825643A公开日：19740723

摘要：1346993 Moulding plastic substances DOWTY SEALS Ltd 28 April 1971 [20 May1970] 24317/70 Heading B5A Articles such as sealing rings 8 (Fig. 3) are made in an openmould 1 from a plastic material such as polyvinyl chloride or epoxy resin. Material isdistributed on the upper surface of the mould 1 to form a layer 9 by pressing aforaminous sheet 3 against the surface; the sheet 3 is thereafter removed. When themoulding material has hardened, the sealing ring 8 is removed from the mould 1 bymeans of the thin layer 9. As described, a multi-compartmented mould 1 is employed,and the foraminous sheet 3 is supported by a framework hinged to the mould 1 (see Fig.1, not reproduced). The sheet 3 is pressed against the mould surface by a squeegee 7,the moulding material being applied either before or after laying of the sheet 3.Hardening is aided by a hot air blast in an oven. After removal from the mould 1, theinterconnected array of sealing rings 8 is crumpled and frozen using liquid nitrogen orcarbon dioxide, and the flash removed by abrasive particles in a barrel or tumbler. Theplastic material may include a blowing agent to give the sealing rings 8 a convex surface,or a solvent that can be evaporated to give a concave surface; metal inserts may beincluded. The foraminous sheet 3 is of woven nylon filaments, and may be shielded by astencil 13 (Fig. 8) that allows the moulding material to form sealing rings 14

interconnected by strips 15.

申请人：DOWTY SEALS LTD,GB

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