Injection Molding
8 مشاهدة
Insufficient Rigidity of High-Density Polyethylene Injection Molded Products
ظاهرة المشكلة
The product has a large deformation when stressed, and the rigidity modulus is lower than the design requirement.
Insufficient rigidity causes excessive deformation of the product in use, affecting function and safety, and is especially critical in structural parts.
تحليل الأسباب
（1）The crystallinity of high-density polyethylene is low, and the rigidity modulus is insufficient
（2）The product wall thickness is too thin or the reinforcing rib design is unreasonable
（3）The mold temperature is low, the cooling is too fast, and the crystallization is insufficient
（4）The barrel temperature is high, the material degrades, and the molecular weight decreases
（5）The material grade is improperly selected or the reinforcing material is insufficiently added
الحل
（1）Increase the mold temperature to a higher value within the 30-80°C range to increase the crystallinity
（2）Optimize the product design, increase the wall thickness or reinforcing ribs, and increase the section moment of inertia
（3）Control the barrel temperature at a reasonable value within the 180-260°C range
（4）Extend the cooling time to ensure sufficient crystallization
（5）Select a high-rigidity grade or add a nucleating agent, and use reinforcing materials when necessary
الخلاصة الأساسية
Insufficient rigidity is caused by low crystallinity or unreasonable structural design, and needs to be solved from both process parameters and product design.
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