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injection molding mold cooling time long and shrink short for parts has what effect/influence
effect/influence injection cooling factors very more, parts and separation type design, cooling types type, temperature degree, speed, cooling pipeline parameters and 空间布置, mold material, melt temperature degree, parts requirements ejection temperature degree and mold temperature degree, parts and mold hot ring function and other.
（1） low mold temperature degree can reduce parts molding shrinkage.
（2） mold temperature degree uniform, cooling time short, injection speed degree fast can decrease small parts warpage deformation.
（3） for/regarding crystallization property polymer, improve/increase mold temperature degree can make parts dimensions stability, rear crystallization phenomenon, is will molding cycle long and parts defect.
（4） 随 crystallization type polymer crystallization degree improve/increase, plastics resistant force cracking property reduce, therefore reduce mold temperature degree is has 利. for/regarding high viscosity type polymer, due to its resistant force cracking property and parts internal stress related, therefore improve/increase mold temperature degree and speed degree, decrease/reduce material time has 利.
（5） improve/increase mold temperature degree can improvement parts surface quality. mold temperature degree injection molding process process in, mold temperature degree effect/influence to plastics 充模, parts type, cycle and parts quality. mold temperature degree high low 取决于 plastics crystallization property, parts dimensions and structure, property can requirements and its it process conditions material temperature degree, injection speed degree, injection pressure and cycle and other. for/regarding type polymer, its melt in mold cavity rear temperature degree reduce solid 化, 但并不发生 versus 转变, mold temperature main/primary effect/influence melt viscosity, 即充模 speed rate. therefore, for/regarding melt viscosity relatively low and in and other type plastics polystyrene (PS), acid fiber and other, using/adopting relatively low mold temperature degree can shrink short cooling time.
