Injection pressure can be considered as the fill pressure (primary pressure) and the hold pressure (secondary
pressure). Generally the fill pressure will be set stronger than the hold pressure. When low-temperature solidification, crystalline resin like NOVADURAN will cause a big shrink, therefore the hold pressure is necessary for filling up and is closely related to the molding shrinkage. Increasing the hold pressure is effective to resolve sink and void problem, but if it increase too much, it might cause burr, so the attention is required.
（2） Injection speed
In the case of thin molded product or multi-cavity molded product which severe size precision is required,faster injection speed is better. In contrast, slower injection speed is better for thick molded product. Also, the program control of injection speed is effective to resolve the jetting and the flow mark.
（3） Injection time
Setting will differ by the molding machine, but basically should be considered as below.
injection time (filling time + pressure keeping time) > gate sealing time
Gate sealing time is the time when resin stops flowing by solidification at the gate part. If pressure keeping is put away before the gate is sealed, molten resin will backflow from the gate by the tool internal pressure, which will cause measurement and physicality variability, and warpage, sink, and void problems, because of decrease in molded product's filling density (packing property). To estimate the gate sealing time, measure the weight of molded product by gradually increasing the injection time, and look for the injection time when the weight of molded became a certain amount and stop changing.