First, how to properly clean the screw of synthetic resin tile equipment
(1) Choosing the right heating device
The use of fire or fire to remove the plastic that is attached to the synthetic resin tile screw is the most common and effective method for plastic processing units, but it is absolutely impossible to use an acetylene flame to clean the screw. The temperature of the acetylene flame can reach 3000 °C. Cleaning with an acetylene flame will not only destroy the metal characteristics of the screw, but also significantly affect the mechanical tolerance of the screw. If the flame of the acetylene flame becomes a permanent blue color when baking a part of the screw, it means that the metal structure of the screw part of the synthetic resin tile equipment has changed, which will result in a decrease in wear resistance of the part, and even resistance The wear layer is peeled off from the base metal. In addition, local heating with an acetylene flame can also cause overheating on one side of the screw, which causes the screw of the synthetic resin tile device to bend. Most synthetic resin tile equipment screws are made of 4140.H.T. steel with tight tolerances, generally within 0.03mm. The straightness of the screw is mostly within 0.01 mm. When the screw is baked and cooled by the acetylene flame, it is usually difficult to return to the original flatness. Correct and effective method: Use the blowtorch to clean the synthetic resin tile equipment screw immediately after use. Since the synthetic resin tile equipment screw has heat during processing, the heat distribution of the synthetic resin tile equipment screw is still uniform.
(2) Choosing the right cleaning agent
Today, the commodity economy is highly developed. There are many kinds of screw cleaners (screw cleaning materials) on the market, most of which are expensive and the effects are mixed. Whether to use commercial detergents, according to different manufacturers and production conditions; plastic processing companies can also use different resins to do screw cleaning materials according to their own production conditions, can save a lot of money for the unit.
(3) Choosing the correct cleaning method
The first step in cleaning the synthetic resin tile equipment screw is to close the feed insert, that is, close the lower feed port at the bottom of the hopper; then reduce the screw speed of the synthetic resin tile equipment to 15-25r/min, and keep this speed to the mold. The melt flow at the front end of the head 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. Depending on the extrusion process (the die may need to be removed to reduce the risk of excessive pressure on the front end of the extruder), 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. 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 stop the mold and remove the die as the extrudate is completely converted from the processing resin to the cleaning resin, and then restart the synthetic resin tile equipment screw (with a rotation speed of 10 r/min) to allow the residual cleaning resin to flow out.
(4) Choosing the right cleaning tool
Proper and appropriate tools and cleaning materials should include:
1, heat-resistant gloves; 2, goggles; 3, copper scraper; 4, copper brush; 5, copper wire mesh; 6, stearic acid; 7, electric drill; 8, barrel ruler; 9, cotton cloth.
Once the cleaning resin stops extruding, the screw can be withdrawn from the device. For screws with a cooling system, remove the hose line and the swivel connection before starting the screw extraction device (which may be attached to the gearbox). Use a screw extraction device to push the screw forward to expose the position of 4-5 screws for cleaning. The cleaning resin on the screw can be cleaned with a copper scraper copper brush. After the cleaning resin on the exposed screw is cleaned, the screw extraction device will advance 4-5 screws and continue cleaning. Repeatedly, most of the screw was finally pushed out of the barrel.
Once most of the cleaning resin has been removed, sprinkle some stearic acid onto the screw; then use the copper wire mesh to remove the remaining residue. After the entire screw is wiped by the copper wire, use a cotton cloth for the final step of wiping. This is to ensure that the next time the screw is produced, it will not carry any contaminants. After the screw has been completely cleaned, it can be set aside until the other implements are completely cleaned. If the screw needs to be stored, apply a layer of grease to the surface to prevent rust.
The cleaning screw must never be used with steel tools such as steel screwdrivers, scrapers or masts to remove the plastic stuck to the screw, as steel can damage the surface of the screw and barrel.