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this type plastics 千万别 mixed combined, need 不就报 waste!
in market upper, plastics types type very more,但 is plastics generally separation is engineering plastics and day use product plastics type. upper, plastics has crystallization plastics and non crystallization plastics separation.
crystallization plastics: nylon, propylene, ethylene, polyoxymethylene (POM) and other and other;
non crystallization plastics: poly carbon, ABS, 透苯, chlorine ethylene and other and other.
is what plastics separation is upper this type 呢? separation structure different.
(1) crystallization plastics surface is slip property, can coating 刷, can 镀铬, difficult decoration surface, currently coating color can 持久, easy 脱落. packaging bag spray coating, printing, color, generally through electronics large electrical 流锥毛, can printing color, is can 持久, bonding agent comparison difficult 找.
但 above type plastics for can mixed combined 一起, mixed combined that 就会报 waste, surface generate 起泡, water 银纹, heavy peeling, 故而两 types type type plastics, attention/notes mixed and, rear very large.
therefore, especially is waste plastics, need attention/notes identification types is what material, different type need separation 别挑开才 can use, type plastics mixed 一点没 has what large effect/influence, propylene ethylene mixed effect/influence large.
1. polymer/macromolecule structure , for property good, 无支链 or very less or 侧基体积 small, large separation function force large polymer/macromolecule easy versus 互靠紧, easy crystallization. 2. temperature degree, polymer/macromolecule from 无序 卷团移动 to positive in long surface, mold temperature relatively high improve/increase polymer/macromolecule active property from add fast crystallization. 3. pressure, in cooling process in if has outer force function, can promote polymer crystallization, production in can high injection shot pressure and holding pressure pressure control crystallization property plastics crystallization degree. 4.形核 agent, due to low temperature has fast speed 形核, decrease slow formed long, therefore is remove this 一矛盾, in molding material in add 入形核 agent, this make plastics can in high mold temperature lower fast speed crystallization.
1. crystallization property plastics understanding need relatively more can amount 摧毁晶格, therefore solid 体转化 is melt melt need relatively more hot amount, therefore injection molding machine can force need large, most large injection amount need versus improve/increase. 2. crystallization property plastics melting point scope/range narrow, is anti 止射咀 temperature degree reduce material crystallization 堵塞射咀, 射咀孔径应适当 add large, add can mono control temperature degree hot 圈. 3. due to mold temperature degree for crystallization degree has important effect/influence, therefore mold water 路应尽 can can more, ensure molding mold temperature degree uniform. 4. crystallization property in crystallization process in relatively large shrinkage, relatively large molding shrinkage, therefore in mold design in need true its molding shrinkage 5. due to toward property significantly, internal stress large, in mold design in need attention/notes gate and large small, add strong/high and and large small, 否则容 easy warpage deformation, rear need molding process improvement is versus difficult. 6. crystallization degree and parts thick has 关, thick cooling slow crystallization degree high, shrinkage large, easy shrink 孔, gas 孔, therefore mold design in need attention/notes control parts thick control
2.熔态 and solid specific gravity large, molding shrinkage large, easy shrink 孔, gas 孔, need attention/notes holding pressure pressure setting; 3. mold temperature low 时, cooling fast, crystallization degree low, shrinkage small, transparent degree high. crystallization degree and parts thick has 关, parts thick large cooling slow crystallization degree high, shrinkage large, material property good, therefore crystallization property plastics requirements must control mold temperature; 4.各 toward property significantly, internal stress large, demolding rear crystallization separation has crystallization 化 倾 toward, can amount balanced 状态, easy deformation, warpage, 应适当 improve/increase material temperature and mold temperature degree, in and other injection pressure and injection speed degree.
