How to use the coater correctly?

1. It is the requirement for the quality of the coating machine scraper. The working surface of the coating scraper must be free of crack defects, and it is necessary to ensure that the entire coating surface has uniform and similar anti-friction performance (wear resistance) on the banner, so as to maintain the similar quality of the coated paper surface after the coating process.
2. Talk about the importance of the feeding space: when the coating is applied by the scraper, 85-95% of the coating will return to the coating storage system, so there is a requirement for a sufficient space in this area to realize the feeding and return.
3. How to avoid backflow: after the paper web is coated with a scraper, the coating begins to dehydrate and gradually solidify - forming a "semi-dehydrated coating area", where the coating gradually dehydrates along the direction of the base paper. When the coating is further dehydrated to form "precoat" or "filtered bread", the blade pressure will "transfer" the shape of the coated blade surface to the surface of the paper coating. In this process, the blade pressure on the coating is very large, so it is easy to form a thin coating behind the blade tip. Excessive pressure or poor paint rheology will cause back flow here. Therefore, it is necessary to adjust the tool pressure reasonably according to the site conditions to avoid backflow. The coating process of the coater is a seemingly simple but actually tedious process, which requires careful preparation of each step to achieve perfect control.
To ensure safe production and maintain the normal operation of the coater,
1、 Preparation before startup:
1. Check the electrical switches and wiring for any abnormal phenomena such as falling off or damage.
2. Wear the traction belt under normal temperature shutdown condition according to the process path requirements.
3. Start the exhaust equipment.
4. Confirm that there is no open flame (such as electric furnace) in the coating machine room.
5. The coating machine control cabinet and drying box shell must be reliably grounded.
2、 Startup procedure;
1. Turn on the main power switch and the power switch on the control cabinet.
2. Set the initial value (usually 180~280) and frequency division number (usually 20~50) on the tension controller.
3. Set the coating working mode and relevant parameters (coating speed, section length, gap length, roll speed ratio, etc.), and then connect the compressed air (adjust the pressure regulating valve of the pneumatic control box to make the pneumatic pressure between 0.2 and 0.3 Mpa);
4. Start the drying fan and drying temperature controller.
5. Power on the automatic deviation correction and tension controller.
6. The temperature of each section of the equipment has reached the temperature required by the process;
7. Feed the hopper of the coating device and start the coating machine at the same time for coating.
3、 Shutdown procedure:
1. Confirm that the coated electrode sheet has been wound, and then stop.
2. Turn off the power supply of the equipment heater, and stop the drying fan and other fans when the temperature of each section drops below 60 ℃;
3. Stop the compressed air.
4. Disconnect the power supply on the deviation correction cabinet and control cabinet.