Modified nylon material has a strong hygroscopicity, to be fully dried prior to processing, can be 80 ~ 90 ℃ hot air circulation drying to a moisture content of not more than 0.3% so far, and should prevent moisture absorption after drying.
High temperature easily oxidative degradation, more than 300 ℃ decomposition, to meet the molding process under the premise of avoiding the solution temperature is too high, and should be avoided in the barrel residence time is too long.
Excellent fluidity, spillover value of 0.02mm, so easy to overflow material need to use self-locking nozzle.
Molding shrinkage and its scope are larger, obvious direction, prone to shrinkage, dents and other defects.
For crystalline materials, high melting point, melting temperature range is narrow, poor thermal stability.
The cooling rate of the melt has a great influence on the crystallinity, which has obvious influence on the structure and properties of the plastic parts. Mold temperature should be controlled well.
For the requirements of high transparency, good flexibility of thin-walled plastic parts, should adopt a lower mold temperature; for the requirements of high hardness, good wear resistance, deformation of thick plastic parts, should adopt a higher mold temperature.
Gating system form and size similar to the processing of PS, but increasing the flow channel and inlet cross-section to avoid shrinkage and dents.
Thickness of the product should be as uniform as possible, stripping slope should be larger, especially for thick-walled and deep-shaped products should take a large value.
When using screw-type injection molding machine, should adopt high compression ratio screw, screw head should be fitted with anti-reverse ring, in order to avoid melt backflow.
Cylinder temperature with the variety of raw materials, plastic parts and injection molding shape may be, mainly determined by its melting point.
Modified nylon products hygroscopicity strong, in order to stabilize their performance, need to wake up the product moisture conditioning.
