Shanghai Daoqin Plastics Co., Ltd.

        随 plastics injection molding machine and mold different separation, due to retardant force and scratch effect/influence, as used for plastics flow front pressure has loss 失. another, plastics 接触模壁, it 就开始 cooling, increase plastics viscosity, from requirements outer pressure plastics front 进.

         in 模壁形 formed plastics 皮层会 decrease small plastics flow 横截面积, from 而导致 pressure drop. injection molding machine upper can to setting injection speed degree used for screw pressure is has most large made.

        以 setting injection speed degree screw front need pressure from 不应该 ultra- can to most large pressure.

        例如, to injection molding machine most large can to liquid pressure pressure is 2200psi, requirements screw speed degree is 5英寸/秒. is let screw 以5英寸/秒 speed degree front 进, if it need 2400psi, however machine will can provide this pressure from screw 就不会以5英寸/秒 speed degree 行进.

         in this type of lower, process to pressure made. in process development process in, understanding in 每一部 separation upper pressure loss has 助于确定 overall pressure loss 失, and 何处出现 large pressure drop. rear, can mold decrease small pressure drop, obtain relatively good property flow. ensure 不会达 to most large pressure, is very important.

         mold trial process in, need attention/notes below/following 几点:

        1, plastics is to filling 末端, requirements can obtain 2200psi overall pressure.

        2, plastics is to product in separation, need can obtain 2200psi overall pressure.

        基于 above 两点, process pressure made.

         plastics is from grade separation runner to grade separation runner need 1379 – 983 = 396psi pressure. plastics is gate, need 1897 – 1379 = 518psi pressure.

         therefore grade separation runner and gate has versus for large pressure drop, that grade separation runner and gate 都应该 by large. this will can decrease/reduce 充填末端 most pressure 至1901psi. in process again pressure made. ensure injection pressure will has 助于达 to mold 一致充填 目. in mold certification process in, pressure drop research is very important steps 之一.

         most rear, need experience method 则: requirements most large injection pressure 应该不 ultra- injection molding machine can to most large pressure 80%.

         high value ——80%, for/regarding need relatively high holding pressure pressure relatively thick product 说, more low. need in different separation pressure rise high, need can can slip.