Printability adjustment of printed materials

Printing ink

Water-based, solvent-based or UV inks are used in flexographic printing. Water-based inks are commonly used in the printing of corrugated paperboard. Even some packaging, labeling, and folding carton printers have tended to use water-based inks. They found that the quality and use of prints can be obtained by printing with water-based inks. The print quality of the solvent-based ink is the same. Water-based ink systems have proven their suitability in practice, such as resistance to rubbing, printability, density, dot gain characteristics, and lack of VOCs (volatile organic components). The emphasis on environmental issues in recent years has further promoted the development of water-based ink systems.

Ink transfer

Ink transfer is marked by the ability of the paper base to absorb ink and the term is called absorbency. This is not a proper description because it means that the paper base absorbs the total amount of ink, and some of it enters the paper causing the transitional consumption of the ink. Therefore, a more widely used and more accurate expression is "ink holding." Ink penetration depends primarily on the type of ink, paper, smoothness, and size of the pores.

In the normal printing process, the ideal situation is to transfer the minimum amount of ink to the paper, and these inks can be used to obtain a satisfactory density and print quality without stickiness. In order for the ink to penetrate well into the paper, there must be sufficient carrier (liquid) for the ink to penetrate into the paper in order to be able to firmly capture the toner and fix them on the surface of the paper. Smooth-surfaced paper usually requires very little ink for good quality, while rough paper requires more ink to achieve the desired effect. Printing on rough paper also produces larger dot gains, which are inevitable in the printing process, and its size depends on the type of paper, the roughness of the paper surface, and the size of the pores. If the ink spreads over the surface of the paper, a large dot gain occurs, and is related to ink quality, plate system, machine configuration, or printing pressure. Dot enlargement is achieved by comparing the dot area on the print with the dot size on the plate or film. Density is often used to determine the number of dots, and they are plotted in a graph. The colors of the curves in the graph are different, representing the printing pressure, the paper, and the ink used. They provide important information related to dot gain and tone reproduction. The key data obtained by testing on a printing press is then provided to the separation device to correct the characteristics of the flexographic printing.

In addition, the correct separation of the pigment and the carrier when the ink penetrates into the surface of the paper is also very important. Another important factor affecting the printability is trapping. It is to superimpose various colors of ink together, and the layers of ink do not separate. The first layer of ink must be completely dried when the multilayer ink is overprinted. Another layer of ink can be superimposed on it. The problem of drying on coated paper or semi-coated paper is generally important, while non-coated paper is easier to solve. If the drying of the ink is not optimized on coated paper and semi-coated paper, the printed color sequence can be selected in an attempt to improve on it, the color sequence being magenta, yellow, cyan (MYC).

Water-based ink advantages

Water-based inks can be used on paper, as well as on film or coated paper substrates. In addition to environmental issues, water-based inks offer many advantages over solvent-based inks. For example, they can be washed with water, do not swell most flexible plates, have no odor, reduce fire and insurance costs, and are subject to fluctuations in oil prices. Small and so on. Under optimal conditions, their prints are almost comparable to solvent-based inks in terms of gloss, abrasion resistance, heat resistance, storage time, and dryness at high speed.

Problems to consider when using water-based ink systems

Drying of water-based inks for use on an absorbable surface depends primarily on the following factors: evaporation, infiltration, precipitation, and chemical reaction. Evaporative drying occurs by heat and air flow, and hot air carries volatile materials in the ink through the surface of the print.

The osmotic drying is accomplished due to the absorbable paper base. The ink coated on the surface of the paper is usually absorbed by the paper by capillary action, so that the surface of the substrate is not easily soiled or transferred to another surface. At this time, the acid in the paper plays an important role in the drying of the ink. It neutralizes the soluble amines in the ink. Printers generally do not place much emphasis on the role of viscosity and pH in achieving the desired print quality. It is also necessary to closely monitor the changes in temperature and the quality of the diluent. All these important factors need to be considered separately. (to be continued)

The school always felt very uncomfortable during class, the Adjustable Desk was too high, the legs could not fully step on the ground, and the neutral height below the Adjustable Desk was not enough, and the gap between the Adjustable Desk was small and the legs could not be completely put in. After observing the other students' Adjustable Desk and asking them, they found that most of the students had a feeling of uncomfortable sitting. Find out about the impact of Adjustable Desk's height on students' body. It is understood that: long-term use of oversized Adjustable Desks by young people will cause students to use too close to their eyes, which will cause the students` vision to drop rapidly and form nearsightedness. On the contrary, if the Adjustable Desk is too short, it will cause fatigue in the waist and neck of the students, resulting in deformed spine and kyphosis. And induced cervical disease. I was surprised. So I talked with my good friend Huang Shaorong to investigate the status of Adjustable Desk. In order to provide reference for the Custom Adjustable Desk department, each student can sit on the most comfortable Adjustable Desk to reduce the harm to the body. We talked about this matter with the science teacher and got the teacher's support and encouragement.

Adjustable Desk

Adjustable Desk,School Adjustable Desk,Electric Height Adjustable Desk,Adjustable Lifting Office Desk

FENGCHENG SHENKE INDUSTRIES CO.,LTD.LIAONING CHINA , http://www.sk-realia.com