Molds & Tooling
6 مشاهدة
Random copolymer polypropylene pipe special material (Nordic standard） extruder die head runner design unreasonable（Variant: Strengthened Measures）
ظاهرة المشكلة
The flow velocity of the extrudate at various parts is uneven, and the product cross-sectional dimension deviation is large.
The die head runner design directly affects the uniformity and quality of the extrudate.In particular, extra attention is needed on top of the original basis, this problem is more prominent and requires key attention.
تحليل الأسباب
（1）The die head runner distribution is unreasonable, the flow path lengths at various parts are unequal\
（2）The die land length is insufficient\
（3）The runner has dead corners, material stagnates and degrades\
（4）The runner surface finish is insufficient\
（5）The die head heating is uneven\
（6）On top of the original basis, extra attention is needed: process parameter fluctuations or equipment status changes aggravate this problem
الحل
（1）Optimize the runner design, adopt a coat-hanger type or manifold type distributor to ensure equal flow path lengths\
（2）Increase the die land length, stabilize melt flow\
（3）Eliminate runner dead corners, use arc transitions at all corners\
（4）Polish the runner surface to Ra≤0.2μm\
（5）Optimize the die head heater band layout, ensure uniform temperature\
（6）And strengthen process monitoring; on top of the original basis, extra attention is needed, paying special attention to parameter stability
الخلاصة الأساسية
The die head runner design needs to ensure uniform melt distribution and no stagnant material; if necessary, redesign the die head.Targeted preventive measures need to be taken in different production scenarios.
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