How to heat the hollow plastic blow molding machine barrel?
There are many heating methods for the hollow cylinder of the blow molding machine, and the resistance heating method and electric induction heating method are more commonly used. In resistance heating, cast aluminum jacket heaters are most commonly used.
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 casting the metal tube into an aluminum alloy sleeve.
How to heat the hollow blow molding machine barrel
In this cast aluminum sleeve heater, the resistance wire heater structure is insulated with magnesium oxide powder in the steel pipe, which has good sealing properties 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, this resistance heater is used by most injection machine screw cylinders.
Electric induction heater structure, the working principle is that the outer circle of the spiral cylinder is equipped with a coil, and the coil is equipped with a magnetically conductive silicon steel sheet. When the coil is AC, the silicon steel sheet and the spiral tube form a closed magnetic circuit. Electric current generates heat due to the resistance of the screw barrel.