Shanghai Daoqin Plastics Co., Ltd.

         mold temperature degree is in injection molding process in and products mold cavity surface temperature degree. is it effect/influence to products in mold cavity in cooling speed degree, from for products inner in property can and appearance quality has very large effect/influence.

        1． mold temperature for product appearance effect/influence

         relatively high temperature degree can improvement resin flow property, from usually make made parts surface slip, has gloss, especially is improve/increase glass fiber reinforced type resin made parts surface 美感. meanwhile also improvement melt combined strong/high degree and outer table/sheet.

        而 for/regarding 蚀纹面, if mold temperature relatively low 话, melt relatively difficult to 纹理 根部, make products surface 显 发亮, “转印”不 to mold surface true 实纹理, improve/increase mold temperature degree and material temperature rear can make products surface to 理想 蚀纹效果.

        2． for products internal stress effect/influence

         molding internal stress formed basic upper is due to cooling different hot shrinkage rate formed, products molding rear, it cooling is surface toward internal 延伸, surface shrinkage hard 化, rear internal, in this process in due to shrinkage fast slow 之差而 generate internal stress.

        当塑 parts inner internal stress high resin elastic property 极限, or in chemical ring 境 侵蚀 lower 时, parts surface generate cracks. for PC and PMMA transparent resin as research 显示, internal stress in surface is pressure shrink 形态, inner is 伸张形态.

        而 surface pressure force its surface cooling 状况而定, cold mold make melt resin speed cooling lower, from make molding product generate relatively high internal stress. mold temperature is control internal stress most basic conditions, 稍许 改变 mold temperature, for it internal stress will has very large 改变. generally 说, types product and resin can internal stress has its most low mold temperature degree. molding thin or relatively long flow 距离时, its mold temperature ratio generally molding most low degree need high.

        3． improvement product warpage

         if mold cooling system design combined or mold temperature degree control 不当, parts cooling 不足, 都会引起塑 parts warpage deformation.

         for/regarding mold temperature degree control, according to products structure 特征 确定 cationic and anionic 模, and 模壁, and parts temperature 差, from utilizing control 模塑各部位 cooling shrinkage speed degree different, parts demolding rear more toward temperature degree relatively high 一侧牵引 direction bending features, orientation shrinkage 差, 避免塑 parts orientation warpage deformation.

         for/regarding structure full for 称 塑 parts, mold temperature versus maintain 一致, make parts 各部位 cooling 均衡.

        4． effect/influence products molding shrinkage

         low mold temperature make separation 子“冻结 orientation ” add fast, make mold cavity inner melt 冻结层 thick degree increase, meanwhile mold temperature low retardant crystallization long, from reduce products molding shrinkage. versus 反, mold temperature degree high, melt cooling slow, time long, orientation water low, meanwhile has crystallization, product shrinkage rate relatively large.

        5． effect/influence products heat deflection temperature (HDT)

         especially is for/regarding crystallization property plastics, if product in relatively low mold temperature lower molding, separation orientation and crystallization by 瞬间冻结, relatively high temperature use ring or processing conditions lower, its separation 子链会进行部 separation heavy new and crystallization process, make product in 甚至远 low material heat deflection temperature (HDT) (HDT) lower deformation.

         positive 确 做 method is use recommendation its crystallization temperature degree mold temperature lower production, make product in injection molding stage/phase to separation crystallization, this type of in high temperature ring lower rear crystallization and rear shrinkage.

        总之, mold temperature degree in injection molding process in is most basic control parameters 之一, meanwhile in mold design in is need factors. it for products molding, processing and most use process effect/influence is can low 估.