How to clean and repair the screw of synthetic resin tile production equipment


How to clean and repair the screw of synthetic resin tile production equipment

How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

One step of cleaning the screw of the synthetic resin tile production equipment is to turn off the feeding insert, that is, to close the lower opening of the bottom of the hopper. The screw speed of the synthetic resin tile production equipment is then lowered to 15-25 r/min, and this speed is maintained until the melt flow at the front end of the die stops flowing. The temperature of all heating zones of the barrel should be set at 200 °C. Once the barrel reaches this temperature, it begins to clean immediately.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

Depending on the extrusion process, it must be done by one person during cleaning: the operator observes the screw speed and torque of the synthetic resin tile equipment from the control panel while observing the extrusion pressure to ensure that the system pressure is not too high.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

The screw speed of the synthetic resin tile equipment should be kept within 20r/min throughout the process. In low pressure die applications, do not remove the die for cleaning. Immediately when the extrudate is completely converted from the processing resin to the cleaning resin, the die is stopped and the mold is restarted, and the synthetic resin tile equipment screw (with a rotation speed of 10 r/min) is restarted to allow the residual cleaning resin to flow out.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

Before the repair of the synthetic resin tile production equipment screw, we should first understand the reasons for the damage.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

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.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

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 amount of material flowing from the diameter gap to the feed direction increases. As a result, the extruder production is reduced. 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 generated by the decomposition accelerates the corrosion of the screw.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment


Filling materials such as calcium carbonate and glass fiber will accelerate the wear of the screw. 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.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

Repair of synthetic resin tile production equipment screws We can consider the following methods:
1. The broken screw should be considered according to the actual inner diameter of the barrel, and the outer diameter deviation of the new screw is given according to the normal gap of the barrel.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

2, the repair screw can also be surface hard chrome plating method, chromium is also wear-resistant and corrosion-resistant metal, but the hard chrome layer is easier to fall off.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

3. After the surface of the thread with the reduced diameter of the wear screw is treated, the wear-resistant alloy is thermally sprayed and then ground to a size. This method is generally processed and repaired by a professional spray factory, and the cost is still relatively low.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment

4. Surfacing the wear-resistant alloy on the threaded portion of the wear screw. Depending on the degree of wear of the screw, weld 1 to 2 mm thick and then grind the screw to size. This wear-resistant alloy consists of materials such as C, Cr, Vi, Co, W and B, which increases the anti-wear and corrosion resistance of the screw. Professional surfacing plants have a high cost for such processing, and are rarely used except for special requirements.
How to clean and repair the screw of synthetic resin tile production equipment
How to clean and repair the screw of synthetic resin tile production equipment
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