EN 
简体中文Cleaning the screw and barrel can take a full day's work, even with two or more operators. This can be done by removing parts or injecting cleaning compounds. It is not always necessary to remove the screw and barrel from the machine, but it may be more cost effective than using a cleaning agent.
When using a cleaning agent, the first step you want to take is to shut off the flow of resin being processed by pushing the sliding door at the bottom of the resin hopper closed. Next, reduce the rotational speed of the screw by about 15 to 25 rpm until the polymer stops flowing from the end of the die or the machine nozzle. The barrel area temperature of the molding machine should be around 200º C to start the purging process.
Once the die is completely purged, the rotation of the screw can be completely stopped so that the die or end cap on the extruder can be removed to expose the end of the screw. The screw can then be restarted and rotated to 10 rpm, pumping the remaining HDPE cleaning resin out of the rest of the screw.
After pumping the remaining HDPE out of the screw, you will need to remove the screw. After removing the swivel, hose and tubing from the back of the extruder, you can connect the screw extraction mechanism to the extruder gearbox. The screw can then be pressed down most of the barrel by the screw extractor.
When cleaning the barrel, stearic acid can be applied to the holes of the plasticizing barrel, and then pushed into the holes with a round wire brush covered with copper gauze. Rotate this brush with a power drill until it can easily move in and out of the barrel hole. You may need to add more stearic acid before it's done.
After this step, a bunch of cotton cloth can be used to wipe down the length of the inside of the barrel hole and remove HDPE or stearic acid residue. The process is complete once you have wiped the barrel hole completely clean with a bunch of rags.
No.8#,1st Branch, Lingang 2nd road, Shuangqiao Industry Zone, Dinghai Zhoushan, Zhejiang, China
+86-580-8058728
+86-580-8058708
