Drying treatment: if stored properly, drying treatment is not needed. Melting temperature: 220~275C, be careful not to exceed 275C. Mold temperature: 40~80C, 50C recommended. The crystallinity is mainly determined by the mold temperature. Injection pressure: up to 1800 bar. Injection speed: Generally, high-speed injection molding can minimize the internal pressure. If the product surface is defective, low-speed injection molding at higher temperature should be adopted. Runner and gate: For cold runner, the typical runner diameter is 4 ~ 7 mm. It is recommended to use circular injection port and runner. All types of gates can be used. Typical gate diameters range from 1 to 1.5 mm, but gates as small as 0.7 mm can also be used. For the side gate, the minimum gate depth should be half of the wall thickness; The minimum gate width should be at least twice the wall thickness. PP material can completely use hot runner system. Molding characteristics: 1. Crystalline substances, with low hygroscopicity, are easy to melt, break and decompose when in contact with molten iron for a long time. 2. The fluidity is good, but the shrinkage range and shrinkage value are large, which is prone to shrinkage cavity, dent and deformation. 3. The cooling speed is fast. The cooling of gating system and cooling system should be slow, and the molding temperature should be controlled. The material temperature is easy to orient at low temperature and high pressure. When the mold temperature is lower than 50 degrees, the plastic parts are not smooth, and it is easy to produce poor welding and flow marks, and it is easy to warp and deform above 90 degrees. 4. The plastic wall thickness should be uniform, avoiding lack of glue and sharp corners and preventing stress concentration.