Gravure and ink collection
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In gravure printing production, because the solvent in the ink tank volatilizes, the uniformity of the ink is reduced, and the surface is easy to form into the ink and the ink block. After the plate roll is attached, the blade is not easy to be scraped, so that the printed product is produced by paste, knife line, etc. defect. To solve this problem, as long as the ink "flows" and continues to mix, this can naturally be avoided.
There are two ways to make the ink move. One is to use an ink circulation pump to circulate the ink. The other is to place a stirring rod in the ink tank to allow the ink to flow in the ink tank. The former is the outer circulation of the ink, the cost is high, and the factors that cause the failure are added, and generally cooperate with the solvent and viscosity automatic control system, which is not included in the introduction. The latter is the most economical and effective measure from the perspective of making the ink uniform.
The stir bar is generally a rod made of an aluminum alloy having a spiral continuous protrusion on the surface, a so-called "corrugated" or unfolded line, and magnetic material at both ends, which can be adsorbed on the plate roll. During the printing, the ink stick floats on the surface of the ink, and when the plate roller rotates, it is rotated in the opposite direction by the adsorption. When rotating, the corrugation drives the surface of the ink to allow the surface ink to move, thereby evening the ink and avoiding the corresponding quality problems of the printed product.
There are two main points in determining the quality of the ink stick:
1, the effect
The agitating ink of the agitating stick is mainly determined by the unfolding line, the so-called corrugation, the size, the angle, the structure and the rotational speed of the agitating rod determine the stirring effect. In general, the faster the stir bar speed, the better the ink mixing effect. The larger the unfolding line, the larger the angle, and the better the effect of stirring the ink. However, the unfolding line is too large, the magnet part is far away from the plate roll, the magnetic force is weakened, and it is difficult to adsorb, and the speed of the stirring rod is lowered (returned), but the effect is poor.
2, life
Because the ink stick needs to float on the surface of the ink, it is generally hollow. If the seal leaks, the solvent will enter the inside of the agitator and will sink and lose the stirring effect, so the seal at both ends should be corrosion resistant. In addition, the surface wear resistance is better.
At present, commercially available stirrer sticks generally have the following types:
1, plastic stir stick
Commonly used in imported products, the surface is made of wear-resistant plastic sheet, the paper core is used internally, the quality is quite good, and the price is relatively high, generally about 1,000 yuan per meter. It is said that some people in China have already copied it, but because there is no better wear-resistant plastic material, the life is relatively poor, and the effect of stirring the ink is not very good.
2, Rope Stirring Stick
Generally made of general aluminum tube, the surface is wrapped with a wire to make the unfolding line. This kind of product has two defects: 1Because the wire is wound, the angle of the unfolding line is relatively small, the 2 wire will infiltrate the ink, when changing the color of the ink Not easy to clean.
3, single-line aluminum alloy corrugated ink stick
The structure is the same as the rope-wound ink stick, but the wire rope is changed to the aluminum alloy spiral protrusion, because there is only one unfolding line, the angle is small, and the effect of stirring the ink is relatively poor.
4, eight-line aluminum alloy corrugated ink stick
The aluminum alloy rotary extrusion profile has 8 expansion lines on the surface and a large angle, which is the best product for the current mixing effect. In addition, these products not only have corrosion resistance at both ends, but also wear resistance. If the iron scraps and other debris absorbed by the stir bar are cleaned in time, the service life is generally 2-3 years, which greatly saves the factory's uniformity. Ink cost. This is also the product of choice for most color printing companies. At present, Beijing Land Meike's LB-03 eight-line stir stick and Guangxi's eight-line stir stick are such products.
There is a problem of the ink return direction of the eight-line corrugated ink stick, which is actually whether the corrugation has an interface problem. If the left and right swirling corrugations meet in the middle, the ink will flow from the middle of the ink tank to both ends or both ends to the middle during operation (need to reverse the direction of placement); if the ink stick is a through grain (ie no interface, no matter whether it is left-handed or right-handed) When working, the ink will flow from one end of the ink tank to the other end. However, these two methods of ink return have little effect on the uniformity of the ink.