Curved screen printing refers to the screen printing on the surface of the round shape, such as various chemical bottles, medicine bottles, wine bottles, etc. Most of them are cylindrical or nearly cylindrical surfaces, (the curved surface of the flat bottle belongs to the cylinder Shaped surface), rarely also conical, spherical. No matter what kind of curved surface, the printing principle is only one, that is, the screen printing curved surface should make pure rolling motion with the screen. During the rolling, the curved surface and the screen are tangent to deal with the falling point of the rubber scrape, and the extension line always points to the center of the circle.
The design of the curved screen printing machine is also based on this principle, which is generally driven by a toothed rack. In telecontrol, the screen is equivalent to a rack, and the curved surface is equivalent to a gear. The radius of the curved surface is the same as the common radius of the gear. When printing, the center of the curved surface and the center of the gear are coaxially adjusted. The silk screen is fed into the rack and the screen is used for horizontal linear motion. The gear and the printing hand are rotated around the curved surface concentrically by the rack. Under normal circumstances, the clamped bottle is positioned with the bottle low, and then the bottle mouth is tightly tightened. For round bottles, there is a distance between the center of the bottle and the center of the circle. There are two ways to print the circle. One is to fix the center of the bottle, the glue can not be scraped, the bottle rotates around the center of the screen, and the screen moves horizontally. As shown in the following figure: At present, the most widely used curved screen printing models are mostly semi-automatic machines. Because this model is more suitable for some small and medium-sized enterprises, small batch order manufacturers, the varieties are changed quickly, easy to operate, and the cost of purchase Compared with the phase automatic screen printing machine is low. However, it needs to be equipped with a surface treatment machine and a curing machine, which requires more workers to operate. The automatic screen printing machine integrates automatic feeding, flame surface treatment, screen printing, and curing into one, with high efficiency and less labor, and is more suitable for larger batch manufacturers. Automata are classified into monochromatic automata and multicolor automata. Multi-color automatic machines are generally more suitable for long-term and large-volume orders. It can print two to five colors on one machine, with the fastest production efficiency of 5000P / H.
Due to the high price of the automatic screen printing machine, the model must be selected at the time of purchase. The functions of the automatic machines produced by each factory are basically the same, but the design of the structure is very different. The high efficiency of the automatic machine, high-speed operation, smooth bottle transfer, and accurate color printing are the key to the mechanical design. The traditional screen printing machine has many defects in the mechanical design. Below we will divide the board with a monochrome automatic machine (collectively referred to as 101).
1. The starting angle of the bottle when moving from one work station to another station is small, and it is easy to hit the edge of the groove when moving, and the deviation occurs. Then, when it moves to the next slot, the offset falls, so that the more the more the more the deviation , The transmission will not be smooth.
2. The transmission mechanism also has the iron density close to the dead point, the impact is large, the mechanism is vulnerable, and it cannot run at high speed.
3. The swing of the silk screen position also affects the accuracy of the suit.
4. The adjustment mechanism is cumbersome, and the adjustment personnel do not know the principle. It takes a lot of effort to find the correct position, and it requires a very skilled adjustment machine to adjust it. This will not cause trouble for many manufacturers to recruit industry workers. Sometimes The manufacturer bought the machine but could not find the staff who could adjust the machine.
In response to this problem, the company produces the most stable and fast machinery. The mechanism is adjusted before leaving the factory. Its advantages are:
1. The iron degree of the bottle is 180 degrees, and the bottle rises and falls in a vertical direction, and it will not touch the slot.
2. The transmission angle is large, away from the dead point, and the force is small and the speed is high.
3. The screen printing mechanism is strengthened, and there will be no left-right swing, so that the overprinting is accurate.
4. There are many advantages such as rarely changing when changing the type and tooling, and having drawings as the basis;
In recent years, due to the progress and development of other packaging and printing processes, it has brought great impact to the curved screen printing industry (table labeling, sleeve labeling). Therefore, some people think that curved screen printing is outdated, and some manufacturers love it. However, we believe that the potential of curved screen printing has not yet been fully tapped.
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