injection molding fault and prevention(6)

塑料成型

1.3 Dark streaks1.4 Color streaksThe cause for the formation of streaks can be deter-mined in many cases only after costly investigations,especially as the appearance of burning and moisturestreaks is similar.Extensive knowledge of the plastic,the mold design and the processing are indispensablefor overcoming the problem.Before launching expen-sive and time-consuming investigations the followingpoints should be checked in the sequence given andif necessary optimized:

Melt temperatureInjection speed

Residence time in the cylinderBack pressure

Moisture content of granulesMold venting

Cleaning of the plasticising unitScrew recovery speed

6

百度搜索“77cn”或“免费范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，免费范文网，提供经典小说教育文库injection molding fault and prevention(6)在线全文阅读。