Shanghai Daoqin Plastics Co., Ltd.

for production small light made parts demand already make thin injection molding formed is injection molding machine most increase property can. “ thin 壁” usually thick less 于1MM light electronics made parts 定义. for large automotive made parts 说, “ thin ” can is 2MM.总之, thin products requirements processing process: more high pressure and speed degree, more short cooling time, made parts ejection and gate 排列. processing process 改变进而 promote mold, machine and made parts design development. lower for thin injection molding for injection machine and mold requirements as introduction, for has 帮.
    1, injection machine

    standards injection machine can used for production multiple thin 壁 plastics products. currently new type injection machine property can large large ultra- 10 year front. material, gate technology and design 进步进一步拓 wide standards injection machine for thin plastics made parts property can. due to thick decrease/reduce, need types more 特殊, tool has high speed and high pressure property can injection machine. 例如, thick degree small 于1MM electronics made parts, time small 于0.5秒且 injection molding pressure ultra- 210MPa is very positive 常. design used for thin injection molding liquid pressure injection machine design has pressure device frequency 繁 驱动 injection molding and clamping. tool has high speed and high pressure property can full electrical injection machine and and electrical 动/ liquid pressure injection machine 也面世. is can 经受 住 new type injection machine high pressure, clamping force most small value must is 5-7吨/英寸（投影面积）. another, thick decrease/reduce injection molding pressure increase 时, large type sheet/plate has decrease/reduce bending. thin products use injection machine for sheet/plate thick degree ratio is 2:1 or more low. production thin products 时, injection molding speed degree and pressure and other processing parameters ring control has in high pressure and high speed lower control and holding pressure.

    injection amount, large machine 筒往往太 large, injection amount is machine amount 40%-70%, thin products molding cycle large large shrink short has can can will most small injection amount decrease/reduce to machine amount 20%-30%. use in injection molding must separation small 心, is for material small injection amount 意味 材 material in machine inner time more long, from 而会导致 products property can decline.

    2, mold

    speed degree is formed 功 thin injection molding key/critical factors 之一. fast speed and high pressure can high speed will melt thermoplastic property plastics material mold cavity in, from anti gate cold solid. if standards made parts in 两秒钟 inner formed 充模, that thick decrease/reduce 25%, has can can will time decrease/reduce 50%, rigid good 1秒.

    thin injection molding advantages is thick degree decrease/reduce 时, need cooling material more less. thick degree decrease/reduce, can will molding cycle shrink short semi. melt plant/unit combined 理设置 make hot runner and 浇道不会妨碍 molding cycle shrink short. use hot runner and 浇道衬 sleeve/set has will molding cycle shrink short most small.

    also 应该考虑 mold use 材. P20钢 by widely used in products 模塑, due to thin injection molding pressure more high, mold must manufacturing separation solid. H-13 and other hard is thin mold increase outer safety 系数. however, solid mold cost can can high standards mold 30%-40%. increase cost usually by improve/increase production property can 抵消.