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Solve the problem of wrong and running flowers in printing?

At present, many rotary screen printing machines in textile printing and dyeing enterprises generally adopt multi color printing. If a pattern has eight colors, there must be eight combination of flower nets. Each color is realized by the printing unit structure of one flower net. In the printing process, the exact pattern can only be printed by strictly keeping the position synchronization between the eight flower net colors.

Causes of "wrong flower" and "running flower" in printing

However, in practice, due to a series of reasons such as the mechanical wear of parts in the transmission structure, as well as the looseness of the flower gear and the deformation of the fabric, it is inevitable that the phenomenon of "wrong flower" or "running flower" often occurs, which reduces the printing accuracy and the product qualification rate is low.

However, the traditional method of flower adjustment relies on manual visual observation, judgment and adjustment. Due to the large error of manual observation and discrimination, the labor intensity is large, and only when the printing runs at a low speed, can it be identified; once the printing runs at a normal and fast speed, the "wrong flower" or "running flower" can hardly be found by manual visual inspection. Therefore, this method not only takes time and has low production efficiency, but also causes a large number of defects and increases the rate of defective products.

How to solve it?

In order to solve the above problems, at present, the most advanced automatic matching scheme of rotary screen printing machine is as follows:

Special marks shall be made on each printing screen cylinder shaft, or when the fabric passes, the detection marks shall be printed on the fabric to correspond to the printing pattern position of the flowery screen, and the artificial participation shall be made in the initial positioning of the flowery screen. During the operation, the marks on the flowery screen or the fabric shall be detected online through the electronic sensor, and the detection signals shall be fed back to the electric motor of the flowery screen to control the flowery screen Mark position or the distance between the web and the fabric mark to achieve automatic control of the flower effect. This kind of rotary screen printing machine only detects the marks on the screen or fabric on-line, not directly the printing pattern colors on the fabric. Because of the deformation of the fabric on the printing guide belt and the non synchronization of the running speed between the printing guide belt and each screen, it will cause the inaccurate color position of the printing pattern after color matching, so it can not achieve high precision Control the effect of color matching.

The automatic pattern matching system of the rotary screen printing machine invented by Changzhou Hongda Electric Co., Ltd. is to automatically detect the color matching position of the printing pattern on-line through the image sensor, compare with the set standard pattern, and automatically control the color position of each section of the pattern with respect to the fabric printing pattern through the controller, so as to eliminate the machine produced by the parts in the transmission mechanism during the printing process of the fabric Mechanical wear is also a phenomenon of "wrong flower" and "running flower" caused by many factors, such as loose flower gear, incongruous speed between guide belt and grid, deformation of fabric on printing guide belt, electrical transmission, etc.

This technology has the function of high-precision error correction and realizes the real precise printing. It can not only improve the production efficiency, greatly reduce the labor intensity, but also greatly improve the qualified rate of products. The invention of this technology will have far-reaching significance for the technological progress of the rotary screen printing machine, marking that the automation system of the rotary screen printing machine in China is in the leading position in the world, and has an important role in promoting the overall level of China's industry and accelerating to become a printing power.