Shanghai Daoqin Plastics Co., Ltd.

injection molding processing products causes analysis injection molding processing products 银纹, surface bubbles and internal gas 孔. formed defect main/primary causes is gas 体（ main/primary has water 汽, separation understanding gas, solvent agent gas, gas ） dry 扰. specific causes analysis lower: 1. machine 台方面: （1） material 筒, screw abrasion loss or 胶头, 胶圈存 in material 流死角, long hot separation understanding. （2） add hot system 失控, formed temperature degree high separation understanding, 应检查 hot electrical 偶, hot and other add hot parts is has issues. screw design 不当, formed understanding or easy belt/tape gas. 2. injection molding processing mold 方面: （1）排 gas defect. （2） injection molding processing mold in runner, gate, type abrasion scratch retardant force large, formed local hot 而出现 separation understanding. （3） gate, type distribution balanced, cooling system combined 理都会造 formed hot balanced 而出现 local hot or retardant gas 通道. （4） cooling 通路漏 water type 腔. 3． plastics 方面: （1） plastics wet degree large, add recycled material ratio/proportion more or has has property material （屑 material easy separation understanding ）, separation drying plastics and remove material. （2） from large gas in or from color agent 吸潮, for color agent 也进行 drying, most good in machine upper drying device. （3） plastics in add lubricant, stabilizer and other use amount more or mixed combined 不均, or plastics belt/tape has property solvent agent. mixed combined plastics hot degree difficult 以兼顾时也会出现 separation understanding. （4） plastics 受污染, mixed has its it plastics. 4． processing 方面: （1）设置 temperature degree, pressure, speed degree, back pressure, 熔胶马达转 speed high formed separation understanding, or pressure, speed degree low, injection time, holding pressure separation, back pressure low 时, due to can obtain high pressure density 不足无 method understanding gas 体而出现银纹, 应设置适当 temperature degree, pressure, speed degree and time and using/adopting more injection speed degree. （2） back pressure low, speed fast easy make gas material 筒, material injection molding processing mold, cycle long melt material in material inner hot long 而出现 separation understanding. （3） material amount 不足, add material 缓冲垫 large, material temperature low or mold temperature low effect/influence material flow and molding pressure, make bubbles formed.