Heidelberg offset printing device

The dusting can not only prevent the back of the printed product from being dirty, but also reduce the friction between the upper and lower two sheets of paper when the paper is delivered, so that the paper can be received neatly, especially when the thin paper printing product with a large area of ​​printed graphics is printed. The printed product is easily curled down on the delivery table. Ordering the paper can prevent the print product from catching ink at the dragging location. When printing glass cardboard, coated paper, and large quantities of ink products, powder spraying is the last level that directly affects the quality of finished products. The dusting device thus becomes an indispensable accessory for high speed offset presses.
First, dusting problems and solutions If used improperly or for other reasons, dusting device sometimes appears poor powder or even blocked and other failures. Good routine maintenance and proper use are essential to avoid or reduce clogging of the dusting device. The following is a description of the common problems of dusting and solutions in the printing process.
1. The reason why the powder spray tube is clogged is that the powder is damped or the amount of powder in the cylinder is too large.
Processing method: Remove the powder spray tube corresponding to the powder spray knob, remove the large baffle at the delivery device, drill to the receiving row seat, pull off the corresponding tube, use air pump or air compressor to blow The powder in the tube blows out.
It is worth noting that the dusting tube must not be washed with water or other solvents to prevent the tube from drying up, causing the spray tube to become clogged again.
Do not add too much dust to the powder tank at a time, and encourage less hard work. Unfinished spray should be placed in a clean place to prevent it from getting wet.
2. Oscillator regulates valve blockage Cause: Blocked by impurities.
Treatment method: plug the oscillator to adjust the valve to see more impurities, you can use steel or fine steel wire carefully remove impurities. If it is found that there are many impurities in the powder, the powder in the powder tank should be discharged through the powder tube and replaced with a clean powder.
In order to avoid this failure, it is necessary to check whether there is any foreign matter outside the powder bag every time powdering is added, and to avoid impregnating the dust into the powder tank together with the dusting powder.
3. The oscillator does not work Fault Cause:
(1) Poor electrical condition, such as poor wire contact or blown fuse.
(2) Improper adjustment, such as the gap between the oscillator and the powder tank is too small.
Approach:
(1) Connect or replace the fuse.
(2) The gap between the oscillator and the powder cylinder is adjusted to about 3mm.
4. Control the dust blowing of the motor The main air blower has too small or no air blower Cause: The motor is not working properly or the exhaust air volume is too large.
Handling: Check if the main motor is in good condition and the electrical is normal. If it is normal, you can use your hand to test whether the air outlet volume is too large. Turn the control button to increase the air volume of the main air blower. In addition, it is also necessary to check if the blowpipe is damaged and if it leaks, replace the new blowpipe.
Second, the maintenance and use of dusting device 1. Every day when off work with a blowing device to open the pink tube unobstructed.
2. If you do not need to spray powder for a long time, you should completely release the powder in the powder tank and turn off the dusting switch. Pay attention to cover the cylinder to prevent impurities from entering.
3. Generally, according to the size of the ink of the product and the paper quality of the paper used, select the appropriate amount of dusting, and adjust the number of nozzles used and the size of the sprayed powder according to the size of the paper format.
4. The oscillation amplitude of the oscillator should not be too large to avoid premature damage.
In short, understanding the performance of the powder spraying device and the correct operation and use methods can maximize the function of the powder spraying device, avoid unnecessary work losses, and improve the quality of printed products and the utilization of the machine.