Flexographic workers all know that in the process of printing with water-based ink, we must pay attention to the ink viscosity. In the laboratory, operators use Zahn cup and code meter to observe, check the viscosity is a common job, if the viscosity of the ink is high, add some water to produce reaction. If water is used to control the ink viscosity, the pH value of the ink decreases with the viscosity. The pH value of water is 7, while the pH value of flexo ink is generally controlled by the supplier, usually between 8.5 and 9.5. When the pH value decreased, the interaction between the ink components began to change. The lower pH value had a significant loss of color intensity. The ink began to separate or split. High pH value also led to the loss of structure and composition. PH value is considered to be the most critical factor to control flexo printing. In the establishment and maintenance of printing ink, pH and viscosity are inseparable, they control each other. How to control the pH value and viscosity? First, use the phmeter to measure the pH value, understand the pH value of ink composition and additives, and record the changes at any time. In addition to water to adjust the viscosity, another premixed adjustment solution can also be used. This adjustment solution contains amines and other ingredients. The adjustment solution provided by the printer can increase the pH value of the printing ink by 1-1.5, so that the ink can be adjusted without water. PH value and viscosity are the key to success or failure of printing. In printing, roller, measuring system, plate, binding operation, materials and drying environment, printing ink can get the best color only under the optimal viscosity and pH value. In overprint, cylinder liner or color overprint, there will be color contact. At this time, the most useful way is to increase the viscosity and reduce the pH value, which is helpful to the drying process and avoid the color after printing being wet by the first printing color. In the process of printing ink use, the automatic viscosity and pH value control system can effectively detect the stability of the on-line printing ink, thereby reducing the ink film and printing ink loss, and reducing the use of volatile organic compounds (VOC) (amines, alcohols or other solvents), which can save printing workers more time. The latest generation of automatic control system has excellent accuracy and reliability, and can be easily operated and maintained. Whether multi unit or single unit control system can be purchased cheaper than before. What's more, whether automatic or manual, the adjustment fluid is used instead of water. 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.
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