成型工藝流程及條件介紹(注塑技術(shù)英語大全)-在線瀏覽
2024-09-16 01:12本頁面
【正文】 event 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. Step3 inject remain 1/3 of product. According to product molding speed and pressure lower than that of step2 To prevent flash speed and pressure should decrease but it can’t shot short. 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. 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 Technique 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. 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 setting 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 ope
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