Remove bubbles on the surface of silk screen substrate       The ink of packaging printed matter sometimes produces bubbles after printing. The main reasons for bubbles are as follows.Remove bubbles on the surface of silk screen substrate    ① Dust, oil stains and other substances are attached to the surface of the printed matter.     ② When printing, the ink itself has bubbles or uneven viscosity.     ③ Printing speed is too fast or uneven.        The internal factor of bubble generation is that the ink viscosity is high, the ink surface tension is large, and the air oil in the ink is difficult to separate from the ink film and stay in the ink layer. If the ink viscosity is low and the ink surface tension is small, the bubbles will disappear by themselves, so there will be no bubbles in the ink of the printed matter.Remove bubbles on the surface of silk screen substrate.        Generally, the following measures can […]

Problems needing attention in screen drying         In the packaging and printing industry, screen printing operators know that a clean and tidy environment is very important for plate making. A clean and tidy environment can prevent many quality problems.      Because the dust and oil stains in the environment adhere to the surface of the photosensitive adhesive layer, they will form pinholes on the screen, affect the printing quality, and then lead to the decline of production and quality.Problems needing attention in screen drying.       Relatively speaking, the cleanliness of the oven is also very important, but this is often ignored. While expanding the scope of consumption, some small and medium-sized enterprises also change the drying equipment from hair dryer to oven.Problems needing attention in screen drying     However, due to the lack of effective management, they will put warm cloth and some sundries into the oven to stop boring together with the screen, and neglect the hy […]

Preparation method of ink     In the packaging and printing industry, ink is a uniform mixture composed of colored body (pigment), connecting materials, additional materials and other materials. It can be printed and dried on the printing materials, and has a certain flow slurry adhesive. Pigments are used to form colors; The connecting material is used to provide viscosity; Additional materials can increase the fluidity of the ink, dilute the ink, reduce the viscosity of the ink, accelerate the drying reaction of the oxidant, and provide wear resistance and luster.Preparation method of ink      Any color has three characteristics: hue, lightness and saturation. Therefore, the above three factors must be considered in the process of color matching. When selecting ink, the gloss, hue, coloring power and hiding power of the ink itself should be considered. In the process of ink color matching, the ink used shall be determined according to the actual printing process, ink layer thickness […]