By Helmut Jantra
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The current quantity is the 1st of 3 that may be released lower than the overall identify Lectures in summary Algebra. those vol umes are in response to lectures which the writer has given prior to now ten years on the college of North Carolina, on the Johns Hopkins college, and at Yale "University.
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3. When not in use, moulds should be stored flat to prevent distortion and protected from dust and moisture. In use, continuous scrutiny is necessary so that any imperfections which occur can be immediately rectified. Sharp instruments must always be kept away from mould surfaces. Properly treated, GRP moulds can give excellent service. 5 EPOXIDE RESIN MOULDS Epoxide resin moulds can in some ways be considered as intermediate between GRP and steel moulds. They have long service lives with many thousands of mOUldings being produced from one mould.
Filament winding can then be carried out directly or the mandrel can be coated or wrapped with a synthetic rubber or other type of liner. 3 WOODEN MOULDS These may be carved from solid blocks of wood or constructed from several pieces stuck together. Plywood or block board can be used for flat surfaces. Whichever procedure is adopted the quality of the mould affects the quality of the moulding. The skills required for mould making are those needed in coach building or cabinet making. By the use of split moulds, undercuts and return angles can be incorporated in mouldings.
Release can also be assisted by filling the gap between the mould and the pattern with water to soften and dissolve the polyvinyl alcohol release agent. If the mould has to be struck in any way, extreme care should be taken to ensure that this does not result in star patterns forming in the gelcoat. Any imperfections in the mould surface can be removed by rubbing with fine abrasive such as grade 600 wet emery paper followed by a fine cutting paste or by using a metal polish. Before use, the mould surface must be thoroughly polished to a high gloss finish using a silicone-free wax polish applied in several thin coats.