plastic LDPE extrusion blow molding machine made in china

1.Blowing pressure

​​The compressed air in the plastic LDPE extrusion blow molding machine made in china

has two functions, inflation and cooling. Low viscosity, small volume or thick-walled parts should use low pressure; high viscosity, large volume or thin-walled parts should use higher pressure.

2.Air blowing speed

extrusion blow molding machine made in china In order to shorten the blowing time, so as to facilitate the product to obtain a more uniform thickness and a better surface, the inflation speed should be as large as possible, but if the speed is too fast, the following phenomena may occur: 1) A vacuum is created at the air inlet, so that this part of the parison is inside When the parison is fully inflated, the indented part will form a diaphragm; ②extrusion blow molding machine the parison in the die part may be broken by the extremely fast airflow.

3.Blowing ratio

plastic LDPE Engine Oil Lubrication bottle extrusion blow molding machine made in china Usually controlled at 2-4 times, if the inflation ratio is too large, the shape stability of the product will be poor, and if it is too small, it will easily cause uneven wall thickness.

4.Mold temperature and cooling time

plastic LDPE extrusion blow molding machine made in china If the mold temperature is too low, the plastic extensibility at the jaw will be reduced, it will not be easy to blow up, and the part will be thickened, making it difficult to form; if the mold temperature is too high, the cooling time will be prolonged, and the production cycle will be long. If the cooling time is too short, the cooling will not It is easy to cause deformation of the product, increased shrinkage, and dull surface.

5.Molding cycle

​​Including the process of extruding the parison, cutting the parison, closing the mold, blowing, cooling, deflating, opening the mold, taking out the product, etc. The selection principle of the molding cycle is to shorten the molding cycle as much as possible on the premise that the product can be shaped.