Clean The Screw Of A Twin-Screw Extruder-Resin Cleaning Method

Resin cleaning method

The use of polyester resin or epoxy resin for cleaning machines is generally used in new equipment cleaning machines or extruders. After a period of use, some materials may remain on the screw or barrel and gelatinize, causing the extrusion speed of the materials to slow down. In addition, when there is a large color difference between the color changing varieties, this method can be used. In today's highly developed commodity economy, there are various types of screw cleaning agents (screw cleaning materials) on the market, most of which are expensive and have varying degrees of effectiveness.

Whether to use commercial cleaning agents depends on different manufacturers and production situations; Plastic processing enterprises can also use different resins to make screw cleaning materials according to their production situation, which can save a considerable amount of expenses for the unit.

The first step in cleaning the screw is to close the feeding plate, which is the discharge port at the bottom of the hopper; Then reduce the screw speed to 15-25 r/min and maintain this speed until the melt flow at the front end of the die stops. The temperature of all heating zones in the barrel should be set at 200 ° C. Once the barrel reaches this temperature, start cleaning immediately.

Depending on the extrusion process (which may require removing the die head to reduce the risk of excessive pressure at the front end of the extruder), cleaning must be done by one person: the operator observes the screw speed and torque from the control panel, while also observing the extrusion pressure to ensure that the system pressure is not too high. Throughout the entire process, the screw speed should be maintained within 20r/min. In the application of low-pressure die heads, do not remove the die heads for cleaning first. Immediately stop the machine and remove the die head when the extruded material is completely converted from processing resin to cleaning resin, and then restart the screw (with a speed between 10r/min) to allow the residual cleaning resin to flow out.