The viscosity and fluidity of inks play an important role in printing quality. The fluidity and viscosity of inks are closely related. When an ink increases its viscosity, it will reduce its fluidity. Otherwise, it will improve its fluidity. A high consistency ink does not mean a high viscosity, and a high viscosity ink is not necessarily thick. Only the same viscosity of the ink, the greater the consistency, the worse the fluidity. At present, many small and medium-sized printing factories use monochrome Offset Press to overprint color printing. For simple printing products, there are two-color overprint. Generally speaking, most of them overprint single-sided four-color printing, but some printing factories overprint a total of eight colors on both sides. This requires high quality and high precision of the printing machine, as well as the exquisite skills of the printing operators, and the ink should be paid attention to in the overprint process. If the fluidity is too small, the transfer of ink is not smooth and uneven in the printing process, resulting in the shallow front and deep back on the same printing surface and other ink faults; if the fluidity is too large, the imprint can not be accurately transferred, the layers of pictures and texts are not clear, the ink color is not full, and the color is not bright and bright. At the same time, the excessive fluidity of oil and ink will also lead to the generation of often dirty plates and ink bars. In the process of printing, you can adjust the viscosity and fluidity of the ink by adjusting ink, but do not add corn flour to the ink for quick drying. It can also be achieved by using quick drying ink. Therefore, in the printing process, to adjust the viscosity and fluidity of the ink. The preservation of ink has always been a headache for printing plants, because the ink placed in the air for a long time, it is easy to be oxidized by the air and form a thick layer of ink skin. In the next printing, the ink skin must be scraped off, which will inevitably waste part of the ink. It is suggested that wax paper should be used to isolate the ink from the air, or plastic paper should be used to seal the ink. That is, wax paper or plastic paper should be pasted on the surface of the ink layer, and the wax paper or plastic paper can be removed before the next printing. However, it is better not to use ordinary paper for sealing, so as to avoid the trouble caused by tearing the paper when uncovering. The general measure adopted by the printing factory is to add a certain amount of water into the ink cartridge to avoid contact between the ink and the air. However, in fact, the oxygen contained in the water will also oxidize the ink, and if the water contacts with the ink for a long time, it is easy to emulsify the ink. When printing on the machine, there will be no ink on the ink. Although the ink supply is quite large, the inking roller (mainly the hard roller) is still not inked. It is worth noting that.
Dongguan Beite packaging materials Co., Ltd. - located in Dongguan City, the world's manufacturing city, is a subsidiary of Beite packaging (China) Co., Ltd., with a plant area of 6000 square meters. It is a flexible packaging enterprise integrating R & D, production and sales. It has a complete set of domestic advanced production equipment, a scientific and humanized management system and a group of experienced technical personnel For backing, to provide customers with quality products and first-class service.
The company produces composite bags, roll film, fruit bags, aluminum foil bags, suction mouth bags, self-supporting bags, zipper bags, anti-static bags, special-shaped bags, etc., which are suitable for the internal and external packaging of food, daily chemicals, electronics, toys, medicine, cosmetics, industrial products and other industries.
We uphold the integrity of cooperation, good quality, good service business philosophy, won the industry's approval, products sold to all over the world; welcome friends from all walks of life to inquire, visit our factory to investigate guidance and business negotiations.