The first step in cleaning the screws of the synthetic resin tile equipment is to close the feed plug, that is, to close the feed inlet at the bottom of the hopper. Then reduce the screw speed of the synthetic resin tile production equipment to 15-25r/min and maintain this speed until the melt at the front end of the mold stops flowing. The temperature of all heating zones in the material barrel should be set to 200 ° C. Once the barrel reaches this temperature, cleaning begins.

Depending on the extrusion process, cleaning must be completed by one person: the operator observes the screw speed and torque of the synthetic resin tile equipment 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 of the synthetic resin tile equipment should be maintained within 20r/min. Do not remove the mold for cleaning in low-pressure mold applications. When the extruded material is completely converted from processing resin to cleaning resin, immediately stop and remove the mold head, then restart the screw of the synthetic resin tile equipment (within 10r/min) to allow the residual cleaning resin to flow out.

Before repairing the screws of the synthetic resin tile production equipment, it is necessary to first understand the possible causes of damage.

The screw rotates inside the barrel, and the friction between the material and the two gradually wears down the working surface of the screw and barrel: the diameter of the screw gradually decreases, and the diameter of the inner hole of the barrel gradually increases In this way, the clearance between the mating diameter of the screw and the barrel gradually increases with the gradual wear of both.

However, due to the unchanged resistance of the splitter in front of the machine head and barrel, this increases the leakage flow rate of the extruded material forward, that is, the flow rate of the material from the diameter gap to the feeding direction increases. The result is a decrease in extruder output. This phenomenon increases the residence time of materials in the barrel, leading to material decomposition. In the case of polyethylene, the hydrogen chloride gas produced by decomposition accelerates the corrosion of the screw.

If there are fillers such as calcium carbonate and glass fiber in the material, it will accelerate the wear of the screw. Due to uneven plasticization of the material or the presence of metal foreign objects mixed into the material, the torque required for the screw to rotate suddenly increases, which exceeds the strength limit of the screw and leads to its fracture. This is an unconventional accidental injury.

For the repair of screws in synthetic resin tile production equipment, the following methods can be considered:

1. Twisted screws should be considered based on the actual inner diameter of the barrel, and the deviation of the outer diameter of the new screw should be given based on the normal clearance with the barrel.

2. Hard chrome plating can also be used to repair screws. Chromium is also a wear-resistant and corrosion-resistant metal, but harder chromium layers are more prone to detachment.

After surface treatment of the thread with reduced diameter of the worn screw, the wear-resistant alloy is thermally sprayed and then ground to size. This method is generally processed and repaired by professional spray painting factories, and the cost is relatively low.

4. Weld wear-resistant alloy onto the worn screw threads. Based on the degree of screw wear, weld 1-2 mm thick and then grind the screws to the desired size. This wear-resistant alloy is composed of materials such as C, Cr, Vi, Co, W, and B, which increases the wear resistance and corrosion resistance of the screw. Professional welding factories have higher processing costs for this type of welding, and except for special requirements for screws, it is generally rarely used.