Technical control of pharmaceutical label products (Chinese)

When you transfer ink, you must also master a principle that minimize the use of different colors of ink, that is, can be tuned with two kinds of ink, do not use three ink to adjust, so as not to reduce the gloss of the ink. On the other hand, the color tone of the scraping ink is slightly darker than the original color, so that the printed color sample can be accurate or close to some. After the sample's ink hue is accurate, batch ink can be adjusted according to their respective ink proportions.

Third, improve the printing quality of label products, a number of technological measures

1. Pay attention to the technology of cutting process. The paper's specification accuracy directly affects the overprint accuracy of the product. Because of different machine structures, their front gauges and pull gauge positions are not the same, so that if the edge of the paper is not squarely cut and there are beveled edges or wavy edges, overprinting will not occur. This requires glue-convex products, the side of the paper must be cut into right angles, straight lines, there must be no bevel or wave edge phenomenon.

In order to improve the cutting accuracy of the paper, the thickness of the cutting must be strictly controlled, because the thicker the paper stack and the softer the paper, the more the paper surface is deformed when the paper presser presses down, so the thickness of each stack is more Less, the more conducive to improving the cutting accuracy of paper. In addition, the edge of the blade should be kept sharp, and according to the hardness of the paper, select the appropriate blade angle, which is also an important measure to improve the cutting accuracy.

2. Pay attention to the rational selection of the bottom plate of the printing plate. The letterpress printing machine with a round flattened structure and the characteristics of the bottom plate material of the printing plate have a great influence on the printing pressure, overprint accuracy, and ink quality effect.

The traditional wooden pallet, the material is not solid, squareness, flatness and stability are relatively poor, prone to bowing and deformation, printing quality is difficult to guarantee. Therefore, letterpress printing should use solid, smooth, square, stable aluminum or cast iron and other metallic materials, which is a reliable guarantee for improving the precision and ink quality of overprinting.

3. Pay attention to the proper use of paper. Paper is very sensitive to changes in the temperature and humidity of the external environment. In particular, paper that has just been produced is most prone to stretching and variability due to changes in temperature and humidity, resulting in inaccurate product overprinting.

In order to reduce the chances of this unfavorable situation, the newly produced paper will generally be stored for about half a year after it is shipped back. After the characteristics of the paper are relatively stable, it is not prone to overprinting when put into use. In addition, it is also possible to hang the paper, and place the cut paper on the printing plant for several days. After the temperature and humidity of the printing room are balanced for a period of time, printing is also conducive to product registration.

4. Take care to choose a suitable printing plate. There are many kinds of plate materials such as copper plate, zinc plate, and resin plate used in the letterpress printing process. Due to the different characteristics of the printing plate materials, there are obvious differences in their printability and printing quality, in accordance with the ink affinity, ink transfer, gloss. In terms of degrees and pressure effects, the resin version had the best performance, followed by copper and zinc.

If you look at the printing quality of the outlets, the printing quality of copper plates is better, and the expansion rate of outlets is also the least. Therefore, according to the characteristics of the product, a reasonable selection of printing materials for printing, in order to better improve the product's printing quality.

5. Pay attention to the rational arrangement of printing color sequence. Reasonably arranging the printing color sequence is an important measure to improve the printing quality. Therefore, the rational arrangement of the printing color sequence should be mainly considered from these aspects, that is, considering the arrangement of the printing color sequence according to the characteristics of the substrate, and considering the arrangement of the printing machine structure. Color order; according to the different layout of the layout of the printing plate layout considerations; according to the original color characteristics to consider the arrangement of the color sequence; according to the difference in the characteristics of the ink to arrange the color sequence; according to the ink drying characteristics of the arrangement of the color sequence, so that the scientific and rational arrangement of printing color sequence , can better improve production efficiency and product quality. (To be continued)