PP injection molding process/Long Fiber reinforced Thermoplastics PP Polypropylene
Melt temperature: 240-250℃
Barrel constant temperature: 220℃
Mold temperature: 60-100℃
Injection pressure: 100-160Mpa, if it is a long runner product with thin wall thickness, it needs to reach 180Mpa.
Holding pressure: 50% of the injection pressure. Since the material condenses relatively quickly, a short holding time is sufficient. Properly reducing the holding pressure can reduce the internal stress of plastic products.
Back pressure: 2-8Mpa, need to be accurately adjusted according to the specific product, because too high back pressure will cause uneven plasticization. Long Fiber reinforced Thermoplastics PP Polypropylene/sale02@lfrtplastic.com/Ms Amy chan
Injection speed: It is recommended to use a relatively fast injection speed; otherwise the product is prone to coking;
Screw speed: The screw speed is high, it is recommended to set the screw speed lower, as long as the plasticization process can be completed before the end of the cooling time;
Measuring stroke: 0.5-3.5D
Residual amount: 2-6MM depends on the measuring stroke and screw diameter;
Pre-drying: drying at 90℃ for about 4 hours. Nylon has water absorption and should be stored in a moisture-proof container and a closed hopper; water containing more than 0.25% will cause molding changes.
Recovery rate: 10% recycled material can be added/Virgin Long Fiber reinforced Thermoplastics PP Polypropylene
Shrinkage rate: 0.7-2.0%, if 30% glass fiber is added, the shrinkage rate is probably in the range of 0.3-0.8%, pp long glass fiber 30% provides a temperature exceeding 60 ℃, the product should be gradually cooled; gradually cooling can reduce the molding shrink. Nylon products can be checked by welding flux.
Gate system: point type, latent type, sheet type and straight gate can be used; it is recommended to use blind holes and gate grips to obtain cold material points; hot runner can also be used due to the narrow processing temperature range of the melt, it is necessary to provide closed loop Temperature control./sale02@lfrtplastic.com;/Ms Amy chan
Barrel equipment: standard screw, special geometric size has higher plasticizing capacity; for glass fiber reinforced materials, long galss fiber PP reinforced thermoplastic Polypropylene requires high wear-resistant bimetallic barrel;
Machine shutdown period: no need to clean with other materials; the residual material can be degraded by subsequent thermal dissolution; sale02@lfrtplastic.com;Amy
Virgin Long Fiber reinforced Thermoplastics PP Polypropylene
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