If the injection product is often replaced according to the plasticization temperature range of the material or residual material, and the amount of oil in the barrel is large, in order to save raw materials and improve work efficiency, barrel cleanser can be used.
Special cleanser is a kind of rubber-like material, which will not melt at high temperature in the extruder barrel, but will soften in the screw groove. When the screw moves forward in the threaded groove, the remaining material can be removed so that the barrel can be cleaned inside.
The extruder barrel that has been heated to the specified temperature is taken out of the furnace and quickly placed on the centrifugal casting machine for high-speed rotation. The molten corrosion-resistant alloy is quickly injected into the body cavity of the high-speed rotating cylinder, and the corrosion-resistant alloy is condensed and integrated into the wall of the body through centrifugal force. Cool the wear-resistant and corrosion-resistant lens barrel that has been cast by bimetal, and then grind the inner bole of the lens barrel.
The extruder barrel screw is located in the worn part, and the bushing can be replaced. Besides, the extruder barrel is usually replaced with the entire bushing, so the maintenance cost is more expensive and the cost-effectiveness is not high.
Once the screw is worn at a certain point, the melt will return to the thread, causing further wear of the screw and barrel. Severe wear will result in wasting a lot of resin and reducing productivity. However, through regular PM testing, severe wear can be prevented, and the best maintenance strategy is to keep the screw/barrel gap within a reasonable range.