Shanghai Daoqin Plastics Co., Ltd.

        1） viscosity 曲线

        做黏 degree is is selection combined injection speed degree, parameters in micro small 波动时不会引起 melt degree large 变化. between 波动应该尽 amount small, ensure product quality can heavy property.

        参考 upper 图 黏 degree 曲线, can to injection shot speed degree high 于55mm/s时, 熔胶 黏 degree basic upper non 常平稳. therefore, injection shot speed degree is 65mm/s会 ensure stage/phase process property. parameters micro small 波动并不会引起熔胶黏 degree very large 变化.

        当然也会 has 特殊情况不 can use this optimization speed degree, ratio decrease small gate and other. this type of lower 当然以 appearance excellent 先, is this optimization speed degree as is injection shot 曲线 参照, ratio 如开始以 low speed through gate decrease small gate 晕, rear speed increase to this optimization speed degree.

        2） flow balanced testing

         has more 穴 情况 lower need this testing, ratio 如2穴 or more 穴. is in different stage/phase, between most large percentage.

        充填不 balanced has can can by 接受, has can can by 接受, 取决于 product quality requirements. this most good in appearance molding 视窗(第四步)完 formed rear 定夺.

        1. if product can by separation holding pressure, and molding very large, product dimensions is in 公差之 inner, if in 话, 充填不 balanced is can 接受.

        2. if molding very small, and saturated 模穴出现 flash/burrs, other 模穴却存 in short or shrink 痕, 找出充填不 balanced causes.

        充填不 balanced usually has 4 main/primary causes:

        1. runner dimensions different

        2. gate dimensions different

        3. gas large small different

        4. cooling different, however this causes in rigid machine 时往往 effect/influence large

         also has types 情况, is 剪切导致 不 balanced, especially is 8穴 cold runner mold.

        3） pressure drop testing

做 pressure drop testing is assessment different stage/phase pressure loss 失状况. this usually machine 台射嘴, runner, runner, runner, gate and 充填末端.

         molding process 不应该 use to machine most large pressure, ratio if machine most large pressure is 180Bar, that filling need most large pressure 不应该达 to 180Bar. if 事实确实如此, that 就意味 screw need more large pressure to setting injection speed degree, is due to pressure made 却达不 to. this type of 情况称 as “ pressure 受限”.

         usually, injection shot process ultra- 90% machine most large pressure. in pressure drop in, if 处于“ pressure 受限” or ultra- 90% machine pressure, pressure in comparison 陡 一段, decrease small pressure loss 失. 例如, in right in, runner pressure drop very large, in this need very large force amount plastics flow. add large runner 直径会 for reduce pressure has 帮助.

        4） appearance molding 视窗

         molding is non important testing. usually this appearance molding is holding pressure and material temperature (无定形 material), holding pressure and mold temperature (crystallization material)构 formed.

         appearance molding 视窗会告诉 has more large adjustment process meanwhile can to appearance can product. most 理想 情况 is has comparison large molding 视窗. if molding comparison small, comparison easy generate quality defect. in upper in, if molding comparison small, comparison easy is process 本身 波动而出现 short or flash/burrs. process is has comparison large molding 视窗 弥补 process 本身 波动.

         appearance molding meanwhile provide rear mold trial in adjustment dimensions or 者DOE experiment/testing in use material temperature / mold temperature and holding pressure upper lower 限.

        5) gate testing

        曲线生 formed rear, selection product weight stability rear time. in upper in, product weight in 7s rear again increase, therefore is safety meanwhile process 本身 波动, holding pressure time need setting is 8s.

         need attention/notes is, holding pressure stage/phase this outer 1s并不会 increase cycle time, is in this time inner, gate already 经冻结而 会 short holding pressure cold runner, meanwhile product already in cooling. therefore more this 1s应该 from cooling time in decrease 掉, ensure cycle time.

        6) mold temperature 图谱

         mold temperature 图谱 目 is is product ejection rear mold surface temperature degree distribution. it can use cooling water is in as or is has “ hot 点”存 in.

         in addition, this also can rear use solution issues - 例如当 product dimensions 出现不一致时 can use mold surface temperature degree is 否跟以 front 一样.

         temperature degree amount must use 接触式 high temperature 计.

         need attention/notes is in 首次开 machine or machine rear, mold temperature 会逐渐 upper rise stability 状态. therefore need in mold temperature stability rear again 进行测 amount (most less 10模 rear).

         upper provide 5 图 frame, this can according to suitable for different mold. ratio 如, if positive in sleeve/set 4穴 mold, need 每穴测 amount same 位置 点记录 in for 应 四 角落 方 frame 里, in frame 留空. if testing is mono mold, 5 都 need use to, table/sheet different amount 位置.