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【正文】 higher more than the second cylinder temperature. turning on temperature is different depending on type of injection molding machine. To protect oil seal of machine it set oil temperature within , If oil seal work on condition that high pressure and damaged It’s work time will be shorter, it can cause molding stable. ers depending on type of product Injection and plastic Technique parameter settingInjectionResinNamMelt’sMolding Temperature (’c)Deposing Temperature (‘C)Mold Temperature (‘c)Resin dry temperature(‘c)HDPE 10812616022231045607080HOPE 13518024031050807080PC polycarbonate220240 260310 320 80120 90120ABS 16018023027045807090PC/ABSPC 200220250300509080100PP 1601702002603003045 PS 14018023030030456580PVC 140180215300204090100AS 16020025028045757090PA6 6215220225245300408095110PA66 66260265260275300408095110PPS 265280300330370100120100130PBT 2252352402602807080105140POM 17018021024080120 PMMA 16018024027040657080Injection is a step which inject melt resin material into mold. It consists of stepl,step2 ,step3,step4 and holding pressure step: l injects usually tunnel material, Injection Volume can be estimated according to the weight of course it can be calculated by formula: L=Si=Vi/L: injection stroke Si: injection strokeVi: injection volume of theoretical Ds: diameter of screw : value of Ω/4.But it cost a lot of time to produce one product if every time molding parameter is setting by calculation.2. Step 2 inject 2/3 of product. It can lower 2/3 of product according to requirement of product. For example to prevent weld line. Molding speed and pressure on this step is the maximum of whole molding section. If Mold suit the injection molding machine and mold structure reasonable and eject air well, pressure of this step should lower 80%. Molding speed setting within 5580% but it may setting 95% for especial product.3. Step3 inject remain 1/3 of product. According to product molding speed and pressure lower than that of step2 To prevent flash speedand pressure should decrease but it can’t shot short.4. Step4 section: Some injection machines have step5,step6 which are same as former molding speed and pressure this step should diminish and inject once more.5. Holding pressure step: No matter what product there is a holding pressure step. Any product can’t molding a same thickness. Usually the deeper section may sink mark . To prevent this defect it should set holding pressure, The injection speed of holding pressure step is slow but holding pressure setting within 2580% depending on sink mark.Plastic Technique1. Plastic should lower 3 steps, because plastic is a step to add melt resin material to cyclinder , Higher stick of resin material ,higher screw back pressure. Screw speed differs depending on deposing temperature of resin material ,Higher screw speed ,Higher trim force of resin, higher cyclinder temperature. Some resin material may deposes so it set screw speed in midspeed such as 4575%, In plastic step setting screw back pressure is very important, Higher screw back pressure ,higher quality of product screw back pressure make resin structure order, Molding product is beautiful and volume stable. But ,it maybe flow if screw back pressure too high . So all factors should be considered when using screw back pressure. 2. In plastic step sucking back is very important too. Sucking back include front sucking back and back sucking back It setting sucking back to prevent flow and line. It sets sucking back speed and pressure within 2050% and distance within 25cm. TOO long distance make cyclinder reserve air and cause bubble at next molding.knocking out technique settingThere is a mold opening step after product cooling taking shape. Mold opening is a reverse step of mold closing. The last step of mold opening speed set slow. Product should be knocked out after mold opened.Knocking outKnocking out includes two steps, Step1 section setting midspeed, knocks product out partly step2 section setting midpressure and midspeed . Depending on different product, midpressure and midspeed sets within 3555% but lowspeed can set 5%. Distance of knocking out longer 12cm than the vertical thickness of product.BackThe same as knocking out, ejector back includes 2 steps. To protect the ejector oil jar, it should make a 13mm distance in the ending point of ejector back.The way of knocking out includes knocking out once, Knocking out repeat and ejector delay. Take product by manipulator or take product easy, it should select knocking out once. To longer the work time of ejector oiljar, times of knocking out lower 3 times. Ejector delay used when product will be damaged if ejector back or suit manipulator.Molding time settingCycle time should shorter on condition that product quality well. Cycle time includes: injection time , holding pressure time, plastic time, cure time, knocking out time and mold protect time. Even mold opening closing speed and knocking out speed affect cycle.1. Injection time consists holding pressure time. Longer injection time, fuller product, we should consider production quantity when we suit for quality. If injection time too long, it may cause a series of defects suck as flash strain. So all sorts of factors should be considered, injection time should be shout if quality suit for requirement.2. Plastic time depends on plastic speed and screw back pressure, but plastic time must shorter than cure time.3. Cure time: Cure time affects molding cycle. Longer cure time, longer molding cycle, lower production quantity. So it sets cure time short on condition that product molding succed and can’t deformation..4. In PCE pany, for using manipulator in abundence , knocking out time suits manipulator, Knocking out delay keeps second when u