Shanghai Daoqin Plastics Co., Ltd.

micro injection molding micro injection molding （也叫 micro molding ） used for production dimensions, function or requirements mm micron products. due to molding products micro type 特征, need molding machine and equipment formed various production as. 如: injection amount control, mold 排空(true 空), injection, products ejection, 检验, separation 离, as, 存放, and packaging. mold parts and mold cavity manufacturing need technology. in various micro molding process in, micro injection molding process tool has below/following advantages: plastics technology 积累 丰富 experience, standards process 程序, high 自动化程 degree and short cycle time. micro injection molding classification heavy micro to separation 之一克, dimensions can can in micron (mm) grade micro injection molding parts molding products (micro molding), micro gears, micro 操纵杆. dimensions injection molding products, tool has micro structure or function 特征（例如, belt/tape has data light 盘, tool has micro surface 特征 透镜, use plastics thin sheet/slice technology manufacturing micro gears thin sheet/slice ）. can tool has 任意尺 degree, dimensions in micron grade high degree products （例如 light technology use parts ）. equipment demand small type plant/unit, screw in 12-18mm scope/range inner, screw long degree relatively short, L/D ratio value large is 15, 以避免 long time 引起材 material degradation; injection amount control and injection speed degree; can heavy control, ratio according to screw and mold cavity pressure from to holding pressure 转换（ recommendation ）; mold temperature degree can rise high to water 平（ has high polymer melt temperature degree ）, 以避免 ultra- thin separation 早期凝 solid; if micro injection molding products thick small 于5mm, must tool mold can force, is this type of lower thick and gas gas dimensions 处于同一数 amount grade; type nozzle, due to processing temperature degree high formed melt 流延; 精确定位 and light mold speed degree, 以避免精巧 micro injection molding parts deformation; 特殊操 as technology will molding parts 取出, 进行检验 and plastics bottle packaging; can 就 准备 dry 净封闭场 or turnover box, 以避免污染 micro injection molding parts. molding process is ensure can positive 确充模, need high injection speed degree and high injection pressure, melt temperature degree is scope/range inner relatively high temperature degree, mold temperature 需精确 control. need use large runner and obtain large injection amount, in melt flow process in can control and 切换, 避免材 material degradation. in addition, using/adopting mold device, high degree mold toward plant/unit, mold system, formed runner device and used for products machine 械手, gate remove system, and in cycle active mold system, for/regarding control production process and has 效处理 and plastics bottle packaging micro injection molding products is important. process excellent, disadvantages micro injection molding is production micro type products, therefore and its it macro injection molding process in competition 关系, this is it advantages. products small runner large, runner can can to injection weight 90%. for/regarding micro type injection application, runner inner material large more 数情况 lower can recycling again use, 因而材 material 浪费严 heavy. production cycle long. due to products usually surface /体积 ratio very high, mold in injection process in must add hot to melt temperature degree above anti 止早期凝 solid, therefore make cycle time long. suitable material has suitable for macro molding material can used for micro molding. main/primary has: POM, polycarbonate (PC) （PC）, polymethyl methacrylate (PMMA) （PMMA）, PA, liquid crystal polymer (LCP) （LCP）, polyetherimide (PEI), and silicon 橡胶. typical applications in light 通信, machine data 存储, medical technology, material technology, device and plant/unit, micro optical device parts, electronics and type product, and equipment manufacturing and machine engineering and other field/area in, micro injection molding products fast speed growth demand. type 例子包括: table/sheet and versus machine parts, automotive parts, accelerated and 距离传感 device, hard and light 盘驱动 device 读写头, medical device, micro type 泵, small 线轴, high degree gears, slip 轮, tube/pipe, light 纤开关 and parts, micro electrical machine, outer device and products. powder injection molding powder injection molding （PIM）结 combined injection molding process advantages and metal, 陶瓷 出众 physical properties, positive in speed formed is types and powder metal new type production technology, used for need high output/production volume, high property can, low cost and complex 形状 场 combined. powder injection process in, formulation metal or powder and polymer adhesion agent mixed combined, injection to mold 里, formed 需形状（生坯）. and injection molding and high pressure versus 似. molding rear, adhesion agent by remove, to formed 坯经 烧结, make powder pellets between generate 冶金结 combined, most products machine and physical properties. mixed material commonly used powder has 不锈钢, oxidation aluminum, iron, silicon acid salt, oxidation and nitrogen silicon. adhesion agent usually thermoplastic property resin is 基础, wax or polyethylene (PE), fiber 素, 冻胶, silicon 烷, water and various machine 基质也经常 use. adhesion agent usually 包括两, types separation: thermoplastic property resin, used for lubricated, viscosity control, increase lubricating and additives. molding and polymer injection molding basic versus 似, molding dimensions need ultra- design dimensions, 以补偿烧结 shrinkage. molding 时, material add hot to 150 to 200℃, mold in, according to products dimensions and formulation different, injection pressure in 35 to 140MPa between, injection cycle is 30 to 60秒. mold can add hot control mixed combined material viscosity, can maintain is room temperature 以利于 cooling. molding stage/phase, molding has 石墨状 relatively high degree, through ejection or demolding ring from mold in ejection. remove adhesion agent requirements in most short time inner will adhesion agent remove, for pressure block effect/influence most small. process is powder injection process in most key/critical 一步. remove methods has types: hot remove, catalytic type adhesion agent remove agent, or solvent agent 抽提. remove process in, has large 约30 to 98% adhesion agent by remove, this process relatively long. remove rear, pressure block is formed 坯. process most rear steps is 烧结, 经 该 hot process make pellets combined formed is 实体. process in, molding products inner pellets 间隙消 remove, significantly shrinkage （ usually in 10 to 20%数 amount grade ）. meanwhile, formed product density can to large 约97%, this its mechanical properties and use other methods production products versus ratio, make has 差别, non small. process advantages and metal and processing methods versus ratio, reduce production cost 20 to 40% is types dimensions control good, basic need processing dry molding process can production complex and 几何特征 products through use injection molding and 自动化 production technology obtain high production efficiency products mechanical properties and 锻造材 material versus process disadvantages products dimensions and thick degree to made products large, Raw Materials in cost in ratio/proportion large. 截面越 thick, adhesion agent remove time long, make process cost high. currently thick made large is 30mm. shrinkage and thick degree uniform property difficult control in has a large amount of separation adhesion agent （ more 达50%）, 导致烧结 process in shrinkage significantly. control shrinkage process is for process main/primary requirements. thick 变化会造 formed in shrinkage non-uniform, increase dimensions control difficult degree. uniform thick for/regarding deformation, internal stress, 空洞, cracks and is important.