How to improve the quality of coated paper printin

2022-08-05
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How to improve the quality of coated paper printing

coated paper is an important material for packaging and decoration printing process. The printing quality of its products largely depends on the advantages and disadvantages of the material itself and the degree to which the operator knows the characteristics of the paper. In other words, to print coated paper products well, corresponding technological measures must be taken according to the characteristics of the paper. Therefore, it is necessary to know and understand the technological requirements of coated paper

the varieties of coated paper are generally divided into single-sided light and double-sided light according to the difference between filling and calendering. From the nature of the coating, it can be divided into casein coating. So coated paper is also called coated paper. Due to the defects in the process of some domestic coated paper, it is easy to produce different degrees of de dusting and stretching variation, especially the curling defect of single-sided coated paper, which affects the accuracy of overprint. If the process operation of printing coated paper is improper, it is also easy to produce sticky dirt (over bottom), chalking, slow drying, Star color is not bright, etc., so the following problems should be paid attention to

1. Before each batch of coated paper is put into use, a series of printing suitability problems involving smoothness, pH, absorption, dryness, scalability and surface bonding strength of the paper shall be tested and analyzed, and then corresponding process measures shall be taken according to the characteristics of the paper, such as adjusting the viscosity, fluidity, dryness and anti sticking measures of the ink, so as to achieve standardized and scientific production, Prevent printing defects

2. It is necessary to check the pad technology and printing pressure adjustment to ensure that the printing ink layer is uniform and bright. The printing pressure of coated paper should be uniform and appropriate. Excessive pressure is easy to cause poor powder dropping, and it is easy to cause unclear dot marks and increase the wear of printing plate. On the contrary, it is easy to cause weak dot imprinting, and blindly increase the ink layer to make up for the layout blooming caused by insufficient pressure. In that way, it is easy to produce sticky, slow drying, poor overprint and other adverse consequences. Therefore, the pressure of the coated paper should be uniform and appropriate. The lining should be made of neutral and hard materials

3. Use coated paper to print trademarks and packaging products, often with light color as the background color, which is made by overlapping and overprinting. In this way, improper printing process can easily lead to some problems and affect the quality. Therefore, when preparing the base color ink, we should try to use heat-resistant and light-resistant ink, and the diluent should be prepared with bright paste. In this way, the base color can be put into the final printing effect, so as to prevent the ink layer from being damaged by the friction of the first printing of the base color

4. Due to the smooth surface of the copper plate, Jinan new era assay instrument Co., Ltd. has very accurate knowledge of the experimental machine and poor ink absorption ability. When printing the field version with large layout, Try to "Deep ink and thin fluorescent. That is to say, the ink phase should be properly deepened, so that the ink can be built into a platform for chemical fiber efficient flexible manufacturing technology innovation, which can not only meet the printing color phase requirements, but also reduce the chance of over bottom imprinting, and prevent color overlay printing. In addition, due to poor paper adhesion, the printed ink layer is sometimes prone to discoloration due to powder loss. Therefore, No. 19 resin oil can be used as the inking oil for printing the first color. In order to To make the laminated ink layer bright, you can add some light oil and dry oil in the ink

5. Due to the large amount of coating, coated paper often encounters the phenomenon of de dusting and black shadow on the printed page during the printing process. In this case, pay attention to check whether the plate mounting process is operated. For example, whether the printing plate is padded too heavily, because if the paper surface pressure is too large, it is easy to crush the coating powder on the surface of the coated paper, resulting in de dusting and black shadow spots. In addition, check whether the ink viscosity is appropriate. This is because PMMA performs better than PC in terms of weather and ultraviolet (UV) radiation resistance. If the printing ink layer is too thick and sticky, it is also one of the reasons for the paper falling powder and stacking the layout. In this case, consider using auxiliary materials to adjust the ink quality to ensure that the testing machine can run continuously for a long time, The above quality problems can be better overcome

6. Control the anti sticking technology of coated paper printing. Coated paper has weak ink absorption and relatively smooth back. In this way, printing pages with large ink receiving amount or multi-color overprint are prone to sticky and dirty problems. Therefore, anti sticking measures should be taken to overcome them. For example, a proper amount of anti sticking agent should be stirred with gloss oil to make it liquid, and then added to the oil and ink to mix well. A better anti sticking effect can be achieved during printing. However, the amount of anti adhesion agent should be reasonably controlled, which should not exceed 4%, so as to avoid such undesirable defects as ink emulsification, printing ink layer blooming and ink layer gloss reduction

in a word, as long as we master its characteristics and correctly control the printing and operation technology, we can not only improve the printing efficiency, but also effectively ensure the printing quality

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