Injection Molding
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Insufficient rigidity of homopolymer polypropylene injection products
Fenómeno do problema
The product deforms greatly under stress, with rigidity modulus lower than design requirements.
Insufficient rigidity causes excessive deformation during use, affecting function and safety; especially critical in structural parts.
Análise das causas
(1) Low crystallinity of homopolymer polypropylene, insufficient rigidity modulus
(2) Product wall thickness too thin or unreasonable rib design
(3) Mold temperature too low; cooling too fast, insufficient crystallization
(4) Barrel temperature too high; material degradation reduces molecular weight
(5) Improper material grade selection or insufficient reinforcing material addition
Solução
(1) Increase mold temperature to the higher value within the 40-90°C range, increase crystallinity
(2) Optimize product design, increase wall thickness or ribs, increase section moment of inertia
(3) Control barrel temperature at a reasonable value within the 200-280°C range
(4) Extend cooling time to ensure full crystallization
(5) Select high-stiffness grades or add nucleating agents; use reinforcing materials when necessary
Conclusão principal
Insufficient rigidity is caused by low crystallinity or unreasonable structural design; it needs to be solved from both process parameters and product design.
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