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injection molding parts in formed color causes

Date: 2019-11-25 03:40 Views: 2340 Source: Internet

一, equipment 方面 (1) equipment dry 净. or its it powder 尘沉积 in material upper make material material 受污染变 color. (2) hot electrical 偶, temperature or add hot system 失调造 formed temperature 控失灵. (3) machine in has material, easy promote plastics degradation; machine or inner has metal material, abrasion make plastics color. 二, mold 方面 (1) mold gas defect, plastics by hot pressure shrink, in high temperature high pressure lower and oxygen gas reaction, plastics. (2) mold gate small. (3) material in or inner lubricant, demolding agent more. necessary 时应定期清洁 material 筒, remove ratio plastics heat resistant property also anti-static property and other additives. (4) nozzle 孔, runner and separation runner dimensions small. 三, process 方面 (1) screw speed high, back pressure large. (2) machine 筒, nozzle temperature degree high. (3) injection pressure high, time long, injection speed degree fast make products color. 四, raw materials 方面 (1) material material by 污染. (2) water separation and material content high. (3) color agent, additives separation understanding. or liquid formed this type of defect causes main/primary is in equipment and raw materials 方面: 一, equipment 方面 (1) machine in has 焦黑 材 material. (2) machine has 裂痕. (3) screw or abrasion loss. (4) material 斗附近不清洁. 二, mold 方面 (1) type inner has 油. (2) from ejection plant/unit in 渗入油. 三, raw materials 方面: (1) raw materials 不清洁. (2) lubricant 不足. dark 纹 一, equipment 方面: injection hot property plastics rear, machine 筒未清洗 dry or nozzle has material 垫导致 injection 开始时排 gas 不畅. 二, mold 方面: (1)排 gas defect. (2) gate small or gate 位置不当. (3) type local retardant force large, make material combined relatively slow formed gas difficult. 三, process 方面: (1) machine 筒, nozzle temperature degree high. (2) injection pressure or back pressure high. (3) injection speed degree fast or injection cycle long. 四, raw materials 方面: (1) pellets 不均, has powder 末. (2) raw materials in material content high. (3) lubricant, demolding agent use amount more.