A variety of material can use at former model make, for example: Big core board, gesso, polyester colophony, epoxy resin, polyurethane is epispastic, PVC bubble, filling, material of glass reinforced plastics, outside besmear has epoxy resin or polyester resinous wood, in fine board (MDF) He Mou some 3 get together thin plate of cyanogen amine cover, be like bathroom wallboard. Plastic or the choice that the mould amount that the quantitative — of the mould gets from former moulding will affect material to reach production method is epispastic board those who make base model or the force plug that all sorts of material make, meet some to damage more or less when drawing of patterns. If need to make many patterns, it is the former model that makes with material of glass reinforced plastics very, have strong former pattern only, ability makes a large number of at manufacturing mould using. Quality of surface of former model of exterior quality — is surface of very important 　 former model should hard, luster, flawless. Shape to the process will duplicate and worsen any blemish on former model. Easy burnish gel coat can provide better coating for former model, those who improve former model appearance is bright and clean degree, when managing later period makes grinding work. Former model shapes to the mould process - colophony systole will cause a part a bit smaller than former model. The component of exact to certain need size, should make former model largish contract in order to offset. Exact enlarge amount is mixed on mould colophony type definitely its are immanent and contractive the frequency of mould of production of temperature of content of fine of quantity, Bo, production and former model face-lifting. The experience law of polyester of the solidify below groovy room temperature is: Should strengthen Bo fine weight to compare for 25% when, linear each feet contractive quantity is 1/32 inch. Enhance colophony photograph to compare with Bo fine, the contractive meeting of gel coat is more, the gel coat cover that its cause a part appears bigger curved concave side. Same reason, bigger flat surface should be in with avoiding since arch a bit opposite way is sunken below. To platelet, often use 1/4 inch linear foot raised. If former model made pattern of a production only,acting ” of “ of algebraic — term is the algebraic 　 that shows former model breaks up into manufacturing mould, so this production mould is acting; If produce a mould to come from the former model that former moulding becomes, so this production mould is mould of the 2nd acting production. The 2nd acting mould asks the geometrical appearance of former model is the mirror of component appearance. Every generation can be compared on generation is a bit young. Specific and narrow numeric decision is mixed at used data technique. Make former mould need an intermediate mould by structure of as identical as component design surface former model geometry, intermediate mould is made by former model and become, be called 0 models (transfer model) . 0 moulds are to use as former as production pattern. Produce with former mould, two or more manufacturing moulds. The 0 moulds of here are acting mould, former mould is made by the 2nd acting mould and be become and all manufacturing moulds (or many) the mould is made and all become by the 3rd generation. The manufacturing mould surface that with Yu Yuan the likelihood is in a few material of the mould to shape subsequently leaves visible stripe, blemish of sex of this kind of adornment (say to do moulage) be shape by what reach a mould in the model radiative, rock-bottom thermal capacity, heat expands, solidify contracts and the bate with immanent gel coat causes. 0 moulds can wait for methodological purify through can using wet grinding, polish these traces. Be in especially of 0 moulds the predestined relationship is mixed outside corner (characteristic of form of sunken ” of convex or “ ) . With in-house brim and corner (characteristic of form of sunken ” of convex or “ ) photograph comparing, exterior convex is easier by burnish. When in-house brim and corner blemish are issueing the blemish that generation mould becomes exterior brim and corner to go up on former mould namely more easily, with respect to can easier purify.