1、脱模压力：原则上应大于塑料射入模具的总压力，以无毛刺为基准。
demoulding pressure: in principle, it should be greater than the total pressure of plastic shot into the mold, with no burr as the benchmark.
2、压力和速度在模具中作用有一些相同的关系。目的是使原料均匀、彻底地进入模具，并以适量的量填满每个角落。如果太低，会造成短射和缩水。如果太高，会出现毛刺、过饱和、粘模、烧焦、易损模具和高内应力。
Pressure and speed have some of the same relationship in the role of the mold. The goal is to get the material into the mold evenly and thoroughly, and fill every corner with the right amount. If it is too low, it will cause short shots and shrinkage. If it is too high, burrs, supersaturation, sticky molds, burning, brittle molds, and high internal stresses may occur.
3、速度：速度的快慢决定了原料在模流道和成品中的状况，如毛刺、过饱和、焦烧、短射、缩孔、粘结不良、易破损等。
speed: the speed of the speed determines the raw material in the mold runner and finished products, such as burr, susaturation, coke, short shot, shrinkage, poor bonding, easy to damage and so on.
4、温度：原料不同，温度不同，溶液颜色过低，成品内应力增大。如果温度太低，压力太高，可能会导致螺丝断裂。温度过高，产品有毛刺，冷却产生温差，造成收缩。原料易分解、变黄、变色、断裂。冷却时间变长，气体不易排出，会有气体。
temperature: different raw materials, different temperatures, solution color is too low, the internal stress of the finished product increases. If the temperature is too low and the pressure is too high, the screw may break. Temperature is too high, the product has burr, cooling produces temperature difference, resulting in contraction. The raw material is easy to decompose, turn yellow, discolor, fracture. Cooling time becomes longer, the gas is not easy to discharge, there will be gas.
5、背压：螺杆在旋转进料时后退的阻力称为背压。它的作用是使原料在输送和压缩中更加紧密。原料的空气和水分可以从螺杆后部排出。使溶胶不含影响成品表面的气体成分。低层会有气泡，表面呈银色。高会过热、结块、溢胶，周期长，螺丝不退。同时松的应用很重要：背压低时，有的原料需要松，有的不需要松（超过背压根据原料调整不同的属性）。背压高时，一定要用松背，注意空气与溢胶的距离。
back pressure: the resistance of the screw back when rotating the feed is called back pressure. Its function is to make the material in transportation and compression tighter. Air and moisture of the raw material can be discharged from the back of the screw. The sol does not contain gas components that affect the surface of the finished product. There will be bubbles in the lower layers and a silvery surface. High will overheat, agglomerate, glue overflow, long cycle, screw does not retreat. At the same time, the application of loosening is very important: when the back pressure is low, some materials need to be loosened, and some do not need to be loosened (over the back pressure, different properties are adjusted according to the material). When the back pressure is high, be sure to use loose back, pay attention to the distance between air and rubber overflow.
6、模具温度和冷却时间会影响成品的粘模、收缩、尺寸公差、表面光亮度、周期等，应根据实际情况及时调整。另外，亚克力、PC等成品，肉厚时一定要有模温，这样才不会产生气泡和应力。
mold temperature and cooling time will affect the finished product's sticking mold, shrinkage, dimensional tolerance, surface brightness, cycle, etc., should be adjusted in time according to the actual situation. In addition, acrylic, PC and other finished products, meat thickness must have mold temperature, so as not to produce bubbles and stress.
