What are the common faults of self-adhesive printing machinery?

In the field of self-adhesive printing, the stable operation of self-adhesive printing machinery is the key to efficient production. However, in actual use, such machinery often experiences various malfunctions, which affect the printing process and product quality. Let's take a look at the common faults of self-adhesive printing machinery.

Inaccurate registration is a common problem related to printing quality. After long-term operation, the transmission components of self-adhesive printing machinery, such as gears and chains, will wear out and experience changes in clearance, which will disrupt the synchronization between each printing unit and make it impossible for the printed patterns on the front and back to precisely overlap. Meanwhile, during the paper conveying process, if the tension is unstable, if it is too loose, it is prone to wrinkling and misalignment; if it is too tight, it may stretch and deform, both of which can cause registration deviations. Blurred images and text are also quite common. If the printing plate of a non-drying offset printing machine is insufficiently exposed during production, the photosensitive layer in the graphic and text parts will not harden fully. During printing, it is prone to being washed away by the ink, resulting in blurred edges. In addition, if the viscosity and fluidity of the ink do not meet the requirements, if it is too thin, it will spread; if it is too thick, it will be difficult to transfer, which will also greatly reduce the clarity of the text and images.

Frequent occurrences of paper jams due to mechanical operation faults. When the paper feeding wheel is in long-term friction with the self-adhesive paper and the surface is severely worn, the friction force on the paper is insufficient, and the paper cannot be conveyed stably. As a result, the paper is prone to getting stuck or tilting in the conveying track. In addition, poor quality of the paper itself, such as uneven thickness and wrinkles, will also increase the chance of paper jams. Excessive mechanical noise is also a common problem. After long-term operation, mechanical components such as bearings and sliders will wear out and generate abnormal friction during operation, producing shrill noises. Meanwhile, the loosening of some components, such as screws not being tightened properly, can also cause noise when the machine vibrates.

Short circuits in electrical system faults occur from time to time. The internal circuits of self-adhesive printing machinery are complex. When the wires are exposed to high temperature and high humidity for a long time, the insulation layer is prone to aging and damage, which can cause short circuits, affect the normal operation of the equipment, and even lead to safety hazards. Faults in the control system should not be ignored either. The control program of the equipment may encounter errors due to data loss, software conflicts, etc., leading to confusion in the operation instructions of the equipment. As the "antennae" of the control system, sensors, if contaminated by dust or damaged due to aging, will be unable to accurately feedback the status of the equipment, causing abnormal operation of the equipment. By understanding these common faults, printing practitioners can promptly identify and solve problems in their daily work, ensuring the stable operation of self-adhesive printing machinery and enhancing production efficiency and product quality.