The pressure and speed have the same relationship as the mold

The mold temperature and the length of the cooling time affect the sticking of the finished product, shrinkage, dimensional tolerance, surface brightness, cycle, etc. The cycle is long and the screw will not retreat. Its function makes the raw material more compact in the transportation and compression. The pressure and speed have the same relationship as the mold. Too low will cause short shots, shrinkage, too high to have hairs, over-saturation, sticking, scorching, vulnerable molds and high internal stress.

When the back pressure is high, you must use the loosening and pay attention to whether the distance is involved in the air or overflow. 5.1. In addition, acrylic, PC, such as finished meat When it is thick, there must be a mold temperature to avoid bubbles and stress. Glue is the criterion. So that the sol does not contain gas components BBQ grill mat that affect the surface of the finished product. Temperature: different raw materials, different temperatures, too low solution glue color Even, the internal stress of the finished product increases. Because the temperature is too low and the pressure is too high, it may cause the screw to break, too high, the product has burrs, and the temperature difference is caused by cooling, causing shrinkage. 

Back pressure; the resistance of the screw when rotating and feeding is called back pressure. The high will overheat, agglomerate, and overflow the glue. At the same time, the application of loosening Very important: When the back pressure is low, some raw materials should be loosened, and some do not need to be (according to various materials of different properties, the back pressure can not be adjusted). 

Speed: The speed determines the raw material The conditions in the mold runner and in the finished product are fast burrs, oversaturation, scorching, short shots, shrinkage, poor bonding, etc. Mold closing pressure: In principle, it should be greater than the total pressure of the plastic injection into the mold, based on no burrs. The cooling time becomes longer, the air is not easy to discharge, and there will be gas.

 The purpose is to make the raw materials enter the mold evenly and thoroughly , Fill the corners in an appropriate amount. The raw material will decompose, turn yellow, change color, and easily break., and should be adjusted in time according to the actual situation. It can make the air of the raw material, The water is discharged from the screw. There will be bubbles and silver streaks on the surface.