What Are The Reasons For The Damage Of The Hollow Blow Molding Machine Barrel Screw?
There are five reasons for the damage of the hollow Blow Molding Machine Barrel Screw:
1. The screw rotates in the barrel, and the friction between the material and the two causes the working surface of the screw and the barrel to wear gradually: the diameter of the screw is gradually reduced, and the diameter of the inner hole of the barrel is gradually increased. Thus, the matching diameter gap between the screw and the barrel increases little with the gradual wear of the two.
However, since the resistance of the front head and the splitter plate of the barrel is not changed, this increases the leakage flow when the extruded material advances, that is, the flow of the material from the diameter gap to the feed direction increases, and the result is that the blow molding machine produces The amount drops.
This phenomenon causes the residence time of the material in the barrel to increase, causing the material to decompose. In the case of polyethylene, the hydrogen chloride gas produced by the decomposition enhances the corrosion of the screw and the barrel.
2. If there are fillers such as calcium carbonate and glass fiber in the material, it can accelerate the wear of the screw and the barrel.
3. Since the material is not plasticized evenly, or metal foreign matter is mixed into the material, the torque of the screw is suddenly increased. This torque exceeds the strength limit of the screw, and the screw is broken. This is an unconventional accident damage.
4. The horizontal, straightness and clearance of the Screw and Barrel are not adjusted in place, and the fastening screws are not reinforced. At the time of starting, the Screw Barrel has friction, which accelerates the Damage Of Blow Molding Machine Barrel Screw.
5. The preheating time before starting is insufficient, the raw materials accumulated in the screw barrel are not fully softened, the starting torque is too large, or there is a large unsoftened material, causing the screw barrel to be sprained or broken, and causing damage to the reduction box. .
