成型工藝流程及條件介紹(注塑技術(shù)英語大全)-預(yù)覽頁
【正文】 roduct. 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. 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. Plastic Technique 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. There 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 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. The 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. Molding time setting 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. 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.. Lowpressure protect is very important for safety and protect mold, Mold protect time should adjust within 13 second suit low pressure and position of mold protect, shorter protect time, make damaged
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