Shanghai Daoqin Plastics Co., Ltd.

         plastics parts sink marks issues (surface shrink and internal shrink 孔), is is relatively thick cooling 时熔胶补充不足而造 formed defect. 我们常常会遇 to how to add large pressure, add large water 口, long injection time, sink marks issues is method solution 情况.

         in commonly used raw materials in, due to cooling speed degree fast, PC material shrink issues can most difficult solution, PP material shrink and shrink issues is comparison difficult 处理.

         therefore, upper thick large parts comparison heavy sink marks issues 时,就 need 采取一 non injection molding tips/techniques, 不然就 very difficult solution issues.

        首先, in ensure injection molding parts 出模不 deformation front lower,采取尽 amount shrink short cooling time methods, let injection molding parts in high temperature lower 提早出模. injection molding parts outer temperature degree still very high, table/sheet has hard 化, therefore inner outer temperature versus for already is very large, this has overall shrinkage, from decrease/reduce injection molding parts internal in shrinkage.

         due to injection molding parts shrinkage amount is 不变, therefore overall shrinkage more, in shrinkage amount small, internal shrink and surface shrink degree therefore decrease small.

         shrink issues generate, is due to mold surface rise temperature, cooling can force decline, rigid rigid solid injection molding parts surface still relatively soft, by full remove internal shrink due to formed true 空,致 make injection molding parts surface in large gas pressure pressure lower toward inner pressure shrink, meanwhile add upper shrinkage force function, shrink issues this generate. but also surface hard speed degree slow easy generate shrink 凹, ratio 如PP material, 反之越 easy generate shrink 孔.

         therefore in will injection molding parts 提早出模 rear, need for its as cooling, make injection molding parts surface maintain hardness, its easy generate shrink 凹. shrink issues relatively is heavy, degree cooling will method remove, need 采取冻 water cold methods, make injection molding parts surface speed hard can can anti shrink 凹, internal shrink also in. 象PP this table/sheet relatively soft material, true and shrinkage force function, injection molding parts also has shrink can can, shrink 凹 程 degree already large is decrease light.

         in upper measures meanwhile,若 again using/adopting long time cooling time methods, surface shrink 凹甚至 internal shrink improvement will more good.

         in solution shrink issues 时,因 mold temperature low add heavy shrink degree, therefore mold most good use machine water cooling, need use water, necessary also will mold temperature again rise high 一, injection molding PC material will mold temperature rise to 100 degree, shrink improvement 效果才会 more good. is is solution shrink issues, mold temperature can rise high, need reduce 一.

         most rear, has above methods can will issues solution,但 already has large improvement, if need will surface shrink issues solution, amount add anti shrink agent is 一 不 already has relatively method. 当然, transparent parts can this 样做.

         if thick parts surface also is in shrink 痕, or to and other plastics parts, that 么引进 gas 体辅助 injection molding will to solution.

         gas 体辅助 injection molding is through high pressure gas 体引入 to made parts thick 壁部位, in injection molding parts internal generate in 空截面, full process, achieve gas holding pressure, remove products shrink 痕 一项 new plastics molding technology. injection molding process can will thick and thin combined in molding, but also made parts residual stress large, easy warpage deformation, surface has shrink 痕.

         new development gas technology through thick internal 掏空, formed production thick 壁, products, but also products appearance surface property excellent, internal stress low. light high strong/high.

         electrical machine, home appliances, automotive, furniture, day commonly used product, office supplies, toys and other is plastics molding full new application areas, gas injection molding technology especially suitable for pipeline products, thick 壁, 偏壁(different thick degree 截面组 formed made parts) and large type structure parts.

         gas 体辅助 plant/unit: nitrogen gas and increase pressure system, pressure control mono and gas parts. gas process can full and injection molding process (injection molding machine)衔接.

         decrease light products weight (省 material) can high 40%, shrink short molding cycle (省时达30%, remove shrink 痕, improve/increase formed product rate; reduce injection molding pressure 达60%, can use small injection molding machine production large made parts, reduce as cost; mold lifespan long, manufacturing cost reduce, also can using/adopting coarse 根, thick 筋, sheet/plate and other more solid structure, increase mold design degree.