Kingplas - Chinese Plastic Blow Molding Machine Manufacturer
There are many heating methods for the hollow blow molding machine barrel, and the resistance heating method and the electric induction heating method are used more. Cast aluminum sleeve heaters are the most widely used in resistance heating.
The cast aluminum sleeve heater is made by placing the resistance wire in a metal tube, filling the tube with a magnesium oxide insulating material, and then casting the metal tube into the aluminum alloy sleeve.
In the cast aluminum sleeve heater, the structure of the electric resistance wire heater is insulated by magnesium oxide powder in the steel pipe, and has good sealing performance and can prevent oxidation; the aluminum alloy sleeve has a large contact area with the heating surface of the barrel and has good thermal conductivity. Therefore, such a resistance heater is used by many injection machine barrels for heating.
The structure of the electric induction heater is such that the outer circumference of the screw barrel is equipped with a coil, and the outer surface of the coil is provided with a magnetic silicon steel sheet. When the coil is connected to an alternating current, the silicon steel sheet and the screw barrel form a closed magnetic circuit, and the alternating magnetic flux induction barrel is produced. Current, because the barrel has a certain resistance value to generate heat.