Powder spraying can not only prevent the back of the printed matter from being dirty, but also reduce the friction between the upper and lower papers during paper collection, so that the paper collection is neat, especially when printing thin paper with a large graphic area , The printed products are easy to curl down on the paper collection table, and the neat collection of paper can prevent the printed products from being smeared with ink. When printing glass cardboard, coated paper and large ink products, powder spraying is the last level that directly affects the quality of the finished product. The powder spraying device has therefore become an indispensable accessory for high-speed offset printing presses.
1. Common faults and solutions of powder spraying devices
If it is used improperly or for other reasons, the powder spraying device sometimes has troubles such as poor powder output and even clogging. Good daily maintenance and correct use are essential to avoid or reduce clogging of the powder spraying device. The following is an introduction to common powder spraying problems and solutions in the printing process.
1. The powder spray tube is blocked
Cause: The spray powder is damp or the powder volume in the powder cylinder is too large.
Treatment method: Remove the powder spray tube corresponding to the powder spray knob, take out the large baffle at the paper collection device, drill under the paper collection row seat, pull out the corresponding tube, use an air pump or air compressor to blow, blow The accumulated powder in the tube blows out.
It is worth noting that the powder spray tube should not be cleaned with water or other solvents to prevent the tube from drying out and causing the powder spray tube to become blocked again.
Do not add too much powder at a time in the powder tank, advocate less work and more work. The unfilled powder should be sealed in a clean place to prevent moisture.
2. Oscillator adjustment valve is blocked
Cause of failure: blocked by impurities.
Treatment method: Most of the impurities that block the oscillator adjustment valve are visible impurities, and the impurities can be carefully removed with steel sheets or thin steel wires. If there are many impurities in the powder, the powder in the powder tank should be discharged through the powder discharge tube and replaced with clean powder.
In order to avoid this failure, you should check whether there are impurities outside the powder bag every time you add powder, and avoid pouring the impurities into the powder tank together with the powder.
3. Oscillator does not work
cause of issue:
(1) Poor electrical, such as poor wire contact or blown fuse.
(2) Improper adjustment, such as the gap between the oscillator and the powder cylinder 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. The air volume of the main air outlet of the motor that controls the powder blowing is too small or no blowing
cause of issue:
The motor is not working well or the exhaust air volume is too large.
Processing aspects:
Check whether the main motor is intact and the electrical is normal. If it is normal, you can use your hand to test whether the air volume of the air outlet is too large. You can turn the adjustment knob to increase the air volume of the main air outlet appropriately. In addition, it is also necessary to check whether the blower tube is damaged and leaks. If there is a leak, a new blower tube should be replaced.
2. Maintenance and use of powder spraying device
1. Use a blower to blow the powder tube smoothly after work every day.
2. If you do not need to spray powder for a long time, you should release all the powder in the powder tank and turn off the powder spraying work switch. Pay attention to the powder cylinder cover to prevent impurities from entering.
3. Generally, the appropriate amount of powder should be selected according to the size of the product ink and the paper quality of the paper used, and the number of nozzles used and the size of powder spray should be adjusted according to the size of the paper.
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 role of the powder spraying device, avoid unnecessary lost time, and improve the quality of the printed product and the utilization rate of the machine.
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