Injection Molding
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Insufficient rigidity of random copolymer polypropylene injection molded products
Fenómeno do problema
The product deforms greatly under stress, with rigidity modulus lower than design requirements.
Insufficient rigidity causes excessive deformation of the product in use, affecting function and safety, and is especially critical in structural parts.
Análise das causas
(1) Random copolymer polypropylene has low crystallinity and insufficient rigidity modulus
(2) Product wall thickness is too thin or reinforcing rib design is unreasonable
(3) Mold temperature is on the low side; cooling too fast results in insufficient crystallization
(4) Barrel temperature is on the high side; 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 40-80°C range to increase crystallinity
(2) Optimize product design, increasing wall thickness or reinforcing ribs to increase the section moment of inertia
(3) Control barrel temperature at a reasonable value within the 190-260°C range
(4) Extend cooling time to ensure full crystallization
(5) Select high-rigidity grades or add nucleating agents, using reinforcing materials if necessary
Conclusão principal
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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