printing ink   Synthetic Paper Printing and Post Press Processing

      For ordinary printing parts, if the water ink balance is well controlled, the conventional paper ink can achieve satisfactory printing effect. For multicolor live parts with high overprint accuracy, if paper with high solvent content is used.Synthetic Paper Printing and Post Press Processing

      The ink will lead to the deformation and distortion of printed graphics and text, especially for low quantitative synthetic paper. In this case, it is recommended to use special ink with high solid content. The content of mineral oil in this ink is very low and can be completely dried only by oxidation.Synthetic Paper Printing and Post Press Processing

Paper supply

(1) The most suitable printing speed is 8000-10000 sheets / hour.Synthetic Paper Printing and Post Press Processing

(2) Before feeding paper, it is best to use a fan to blow air on the synthetic paper stack so that it can be separated easily.Synthetic Paper Printing and Post Press Processing 

(3) If the humidity is too low, it is easy to generate static electricity. Keep the relative humidity of the environment above 50% when printing polyith synthetic paper. At the same time, you can use static electricity elimination devices to control static electricity. For example, the use of static electricity elimination metal wire (tinsel) helps to reduce the accumulation of static electricity.Synthetic Paper Printing and Post Press Processing

        Printing plate although synthetic paper can use paper plate / polyester plate when printing, metal plate and pre coated photosensitive resin plate are still better choices. When using paper plate / polyester plate, it should be noted that some additives will delay or prevent ink drying.Synthetic Paper Printing and Post Press Processing

      Ink water balance of fountain solution is the most important factor affecting offset printing quality. 11% – 15% alcohol fountain solution can be used or other alcohol solvents can be added to the fountain solution to improve printing quality. Synthetic Paper Printing and Post Press Processing

      It is recommended to keep the pH value of fountain solution at 5.5-6.0 and the temperature at 48-59 ° F. Since synthetic paper does not have the absorption performance of paper, the water supply on the printing plate should be reduced by 10% – 20%, otherwise it will affect the drying of ink.Synthetic Paper Printing and Post Press Processing

       It is recommended to use 400 mesh fine powder for powder spraying, instead of the commonly used 300 mesh matte starch powder. Soluble powders are not recommended because they are not sufficient to prevent ink from getting dirty.Synthetic Paper Printing and Post Press Processing

      The stacking height of stacked paper is generally 9 inches, but it is recommended that the stacking height of synthetic paper should not exceed 7-8 inches, and the ideal stacking height is 6-7 inches. Do not treat the printed stack until it is completely dry.

       Drying in order to avoid ink rubbing and further printing, it takes at least 3-5 hours of drying time. At least 12 hours of thorough drying time is required before cutting, coating and post-processing of synthetic paper. If suitable UV ink is used, the drying time can be shortened. Synthetic Paper Printing and Post Press Processing

       Similarly, the use of electron beam and infrared drying can also improve the drying speed. In order to maintain the dimensional stability of synthetic paper during drying, the temperature shall not exceed 150 ° F. Compared with paper, the printing pressure can be reduced by 5% – 10%. Post press processing

       Polylith synthetic paper can adapt to a variety of post press processing methods, such as paper cutting, slitting, die cutting, drilling, punching, snap ring, concave convex pressing, hot stamping and folding.Synthetic Paper Printing and Post Press Processing

cutting

Polylith synthetic paper can easily achieve the same paper cutting accuracy as paper, and the paper cutter used should be kept sharp. In addition, due to the compressibility of synthetic paper, a lighter clamping pressure should be used.Synthetic Paper Printing and Post Press Processing

Die cutting

       The die-cutting knife used for die-cutting synthetic paper shall be quenched and hardened, and its Rockwell hardness shall reach at least 55 degrees, while the blade hardness used for ordinary paper is 45-48 degrees. Synthetic Paper Printing and Post Press Processing

       You can choose the products of famous die-cutting knife suppliers, Austria Baona and Sweden Sandvik. In the choice of blade angle, the standard blade angle of 60 degrees can be selected when cutting thin materials; The blade angle of 52 degrees can be selected for materials with a thickness of 0.008-0.014 inches; For materials thicker than 0.014 inch, a 42 degree blade angle is recommended.Synthetic Paper Printing and Post Press Processing

Drilling and punching

       Polylith synthetic paper can be drilled and punched. The cutting knife should be sharp enough because the irregular edges cut by the blunt knife will greatly reduce the initial tear strength. During drilling, the generated heat will cause the edge of synthetic paper to melt.Synthetic Paper Printing and Post Press Processing

       In order to reduce the generated heat, an additional short residence time can be added. The drill bit shall be kept sharp and the stacking height during drilling shall not exceed 1 inch.Synthetic Paper Printing and Post Press Processing