Shanghai Daoqin Plastics Co., Ltd.

commonly used plastics injection molding parts process parameters 十, polycarbonate (PC) （PC） material temperature degree material 区 70～90℃（80℃） 区1 230～270℃（250℃） 区2 260～310℃（270℃） 区3 280～310℃（290℃） 区4 290～320℃（290℃） 区5 290～320℃（290℃） nozzle 300～320℃（290℃） 括号 inner temperature degree as is basic setting value, utilizing rate is 35％ and 65％, parts long and thick ratio is 50: 1 to 100: 1熔 material temperature degree 280～310℃ material temperature 220℃ mold temperature degree 80～110℃ injection pressure is material flow property 差, need very high injection pressure: 130～180MPa（1300～1800bar） holding pressure pressure injection pressure 40％～60％; holding pressure low, products force low back pressure 10～15MPa（100～150bar） injection speed degree 取决于流 long and thick degree: thin products need fast speed injection; need good surface quality, use more grade slow speed injection screw speed most large speed degree is 0.6m/s; make time and cooling time for 应; screw need large 扭矩计 amount 行程 （0.5～3.5）D残 material amount 2～6mm, 取决于计 amount and screw 直径预烘 dry in 120℃ temperature degree lower dry 3h; maintain water low 于0.02％, make force property can more excellent recycling rate most more can add 入20％回 material; relatively high material ratio/proportion maintain resistant hot property, force property can reduce shrinkage rate 0.6％～0.8％, is reinforcement type type, 0.2％～0.4％ gate system gate 直径应该至 less and other products most large thick 60％～70％, is gate 直径至 less is 1.2mm（ gate degree is 3～5°, or surface quality good products need 2°）; for thick uniform relatively small products can using/adopting gate machine 停工时段 如 production in 断, as machine extrusion machine that to has plastics extrusion and temperature degree drop to 200℃ left right: material 筒, use high viscous property PE, will screw from hot material in 抽出并 use filament 刷刷 残 material material equipment standards screw, ring, nozzle