Surface printing related matters
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Curved screen printing refers to screen printing on a rounded surface, such as various chemical bottles, vials, bottles, etc., which are mostly cylindrical or nearly cylindrical surfaces. (The curved surface of the flat bottle belongs to the cylinder. Shaped surface), rarely conical or spherical. No matter which kind of surface, there is only one printing principle, that is, the silk screen surface should be purely rolling with the screen. In the rolling, the surface and the screen are tangent to the falling point of the squeegee, 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, and is generally a geared transmission of the rack and pinion. The telecontrol 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 radius of the gear's commensurity. When printing, the center of the curved surface is coaxially mounted with the center of the gear. The silk screen is fed into the rack and the screen to make the horizontal linear motion gear and the printing hand rotate under the rack and rotate concentrically around the curved surface. Under normal circumstances, the bottle is positioned with the bottle low and then the bottle is closed. For round bottles, there is a distance between the center of the bottle and the center of the circle. When printing round and round, there are two ways; one is to fix the center of the circle, the glue does not move, the bottle rotates around the center of the circle, and the screen moves horizontally, which is generally used for automatic machines. As shown in the following figure: At present, the widely used curved screen printing machine is more than semi-automatic machine. Because this type of machine is more suitable for some small and medium-sized enterprises, small batch order manufacturers, variety replacement is fast, easy to operate, purchase cost It is low compared to the phase automatic screen printer. However, it is necessary to equip the surface treatment machine and the curing machine with more workers. The automatic screen printing machine integrates automatic feeding, flame surface treatment, silk screen printing and curing into one, with high efficiency and less labor, which is more suitable for large batch manufacturers. The automatic machine is divided into a monochrome automaton and a multi-color automaton. Multi-color automata are generally suitable for long-term high-volume orders. It can print two to five colors on one machine, and the production efficiency is the fastest.
5000P/H.
Due to the high price of the automatic screen printing machine, it is necessary to select the model when purchasing. The functions of the automatic machine produced by each factory are basically the same, but the design of the structure is very different. A high-efficiency, high-speed operation of the fully automatic machine, smooth delivery of bottles, and accurate color-printing are key reports of mechanical design. Traditional screen printing machines have many defects in mechanical design. Below we will use a monochrome automatic machine (collectively referred to as 101).
1. The starting angle of the bottle from one work to another is small, and it is easy to touch the groove when moving.
When the bit is moved to the next slot, the offset falls, so that the more the transmission is, the more the transmission will not be smooth.
2. The transmission mechanism also has an iron point close to the dead point. The impact is large, the mechanism is vulnerable, and it cannot run at high speed.
3, the silk screen position swing, but also make the set of precision precision affect.
4, the adjustment mechanism is cumbersome, the adjustment personnel do not know the principle, in order to find the correct position, it takes a lot of effort, need a very skilled adjustment personnel to adjust, so that many manufacturers recruit workers in the industry do not have trouble, sometimes The manufacturer bought the machine but could not find a staff who could adjust the machine.
In response to this problem, the company produces the most stable and fast machinery. The mechanism is fully adjusted before leaving the factory, and its advantages are:
1. The iron content of the bottle is 180 degrees, and the bottle is in the vertical direction when it is falling and falling, and it will not touch the slot.
2, the transmission angle is large, away from the dead point, the force is small and high.
3. The silk screen printing mechanism is reinforced and does not produce left and right swings, so that the overprinting is accurate.
4. When changing varieties and tooling, it is rarely mobilized, and there are many advantages such as drawings;
In recent years, due to the advancement and development of other packaging printing processes, the curved screen printing industry has brought great impact, (table labeling, sleeve labeling). Therefore, some people think that the silk screen printing has been outdated, and some manufacturers have loved it, but we believe that the potential of curved screen printing has not been fully explored, and the industry has to work hard and have a long way to go.