Blowing pressure
Blow molding manufacturers introduce that compressed air in blow molding has two functions, inflation and cooling. Low viscosity, small volume or thick wall parts should use low pressure; high viscosity, large volume or thin wall parts should use higher pressure.
2.Blowing speed
In order to shorten the blowing time, in order to help the product obtain a more uniform thickness and a better surface, the inflation speed should be as large as possible, but the speed is too fast to cause the following phenomena: ① create a vacuum at the air inlet, so that the part of the parison When the parison is completely inflated, the indented part will form a diaphragm. ② The parison in the die part may be broken by the extremely fast air flow.
3. Inflation ratio
Blow molding manufacturers stated that it is usually controlled at 2-4 times. If the inflation ratio is too large, the shape stability of the product is poor, and too small will cause uneven wall thickness.
4. Mold temperature and cooling time
If the mold temperature is too low, it will reduce the ductility of the plastic at the jaw, make it difficult to inflate, and make the part thicker, making molding difficult; if the mold temperature is too high, the cooling time will be extended, 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, increase shrinkage, and make the surface dull.
5. Molding cycle
Overview of blow molding manufacturers, including processes such as extrusion parison, cutting parison, mold clamping, air blowing, cooling, deflation, mold opening, and product removal. The selection principle of the molding cycle is to ensure that the product can be shaped as much as possible. shorten.
