Shanghai Daoqin Plastics Co., Ltd.

         in plastics processing process in, mold temperature degree is need control important amount. temperature degree control can reduce injection molding mono cost. improve/increase products quality, ensure plastics parts surface positive 确 复 made, ensure shrinkage property. therefore, mold temperature degree control must by optimization.

        一 hot mold surface make plastics surface long time maintain liquid 态, in type inner formed pressure. if type 腔填满 but also in table/sheet 皮出现 hard front, type pressure can will soft/flexible plastics pressure in metal upper, that type surface made high. 另一方面, if in low pressure lower type plastics 暂停, time more short, that it and metal light micro 接触都会造 formed 污点, has by is gate 污斑.

         for/regarding types plastics and plastics parts, in mold surface temperature degree 极限, ultra- this 极限就 can can 出现一 types or more more defect effect/influence (例如: parts can flash/burrs). mold temperature degree more high flow retardant force more small. in many injection molding machine upper, this 自然就意味 more fast 流 浇, gate and type 腔, is use injection molding flow control 阀并不纠 positive this 改变, filling more fast in and type inner more high has pressure. can can formed material flash/burrs. due to more hot type 并不冻结 that in high pressure formed front 进入溢 material 边区域 plastics, material can in ejection 杆周围溢 material flash/burrs 并溢出 to separation 割线间隙 inner. this table/sheet need has good injection speed rate control, 而一 现代化 flow control device 也确实 can to this 点.

         usually, mold temperature degree rise high decrease/reduce plastics in type has cold 凝层, make melt material in type inner more easy flow, from obtain more large parts weight and more good surface quality. meanwhile, mold temperature degree improve/increase also make parts force strong/high degree increase. many mold, especially is engineering use thermoplastic property plastics, in versus for relatively high temperature degree lower 运行, if mold has temperature, to gas and injection molding machine upper hot amount can very easy and material 缸流失 一样 more. therefore need will mold and machine sheet/plate thermal insulation, if can can, will mold surface thermal insulation. if use hot runner mold, decrease/reduce hot separation and cooling injection molding parts between hot amount 交换. this methods can decrease/reduce can amount and preheating time.

         temperature degree control for formed property and as is, formed product appearance, material material property 质, formed ring and other, 受模仁 temperature degree effect/influence, is 显. generally molding 情况, temperature degree maintain relatively low, can improve/increase injection shot relatively is 理想, and formed product 形状(模仁构造) and formed product material types type has formed ring 亦寄赖于必需 improve/increase 模仁充填之 temperature degree.

        此 is formed product material issues, requirements has cooling speed degree. cold time short, make has 一部份 hard 化一部份尚 soft combined, still can due to 不均一 shrinkage 引起应 force. 亦即适当之 temperature degree control can for cooling force property 质改良.