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Injection and packing Injection to overcome the resistance of the flow path, the melt is filled into a mold. On the preform, the best three-speed and pressure, in descending order.Injection speed is too slow, cut enough to cool down before the full, resulting in the product is not full or short shots; fast, less exhaust cavity, resulting in sufficient dissatisfaction, shrinking, AA high.Packing has two important roles: to prevent backflow of melt and cooling under pressure to ensure (enhance the cooling effect). Too high and will cause excessive swelling filling molds, internal stress will be higher, and may crystallize. Too low will cause shrinkage, deformation preforms (cooled enough), gate issues, such as pinholes, bubbles, etc., because the cooling rate of decline at the gate. Dwell time should be appropriate, too short will cause pinholes, drawing and so on.