Abstract : The paper analyzes 31 kinds of common flaws which are easily produced in the continuous flatbed printing , including the causes of flaws, the phenomenon of defects and various solutions. Keywords: flat screen printing Common defects Defect phenomenon cause Solution Flat screen printing of defects, ever-changing, people put it grouped into several types, to distinguish between the time of testing finished products, according to a phenomenon named. In fact, there is very little recurrence of defects, and despite the same phenomenon, it is not necessarily the same reason. Here, we will analyze the most common defects and provide an analysis of the flaws for reference. 1 Pressure paste Its symptoms manifested pattern of contour is unclear, complex color contact surface or edge blur airway pressure paste. According to the principle that there is pressure and paste, when the wet cover is wet- printed, the latter version will be pressed on the previous version, and the number of pressures on the press-contact port will be more serious. To overcome this state occurs: first, must be selected with a suitable doctor blade (hardness), yield squeegee paste to the net; and the distance between the plate when the plate is conditional, if necessary, intermediate heating hair; flower version correctly arrayed In the position, firstly print the stem and then print the block surface; handle the opening of the pattern as little as possible and avoid intrusion of excessive number of layouts; make appropriate filler treatment on the frame side to reduce the contact area of ​​the stamp. 2 Paste edge The fabric side pressure paste. Since the missing green cloth width, the first narrow width or patch are not aligned, the two flat mesh screen printed slurry to the conduction band, and then adhered to the back of the next screen, and then the next printing plate cloth Edge , resulting in paste edge ; edge suction device failure , into the cloth cloth edge is not a straight line ; flat net sealing the width of the width of the large dry cloth door width. Solution: For gray fabrics with different widths , they must be rearranged and the width of the machine printed into the fabric must be the same. The two ends of the screen are sealed from the width of the cloth and printed at the printing position, so that no extra pattern is used to print the color paste onto the conduction belt; the edge suction device is in good condition, and the distance from the conduction belt is not equidistant when the patch is applied; the doctor scrapes Width is greater than 5cm above each side of the cloth. 3 Open The outline of the flower shape is blurred and the color of the pattern penetrates into the fiber. Cause: After cleaning wiper quit the conduction band, gray paste with water, the conduction band watermark, resulting in good penetration of the printing paste; low viscosity paste, a very strong dye concentration, an amount of grout through printing much or more than the amount of moisture absorbent and the original paste to hold water and poor, will result in the printing of the opening; flower print edition after washing is dry, resulting in the previous version of the open, these are items needing attention. Solution: Check the washing tank of the conduction band is no good wiper device; selecting a good hold aqueous paste; inspection process recipe reasonable amount (saturated amount of dye, the amount of additives different gray fabric), the slurry laying time not too long; The flower plate is washed and dried before use. 4 Scraping The discolored pulp is scraped in, resulting in incorrect shades or dark colors in light-colored patterns. The reason is: dark flowers have a large amount of pulp; the border of the flower frame is not good, and the pulp is brought into the floral version from the conduction band. Add miscoloring when adding the slurry. Solution : According to the width of the fabric, it will stop the flower layout . When the printing paste to be net, less pulp, ground pulp. When changing color, the scraper should be cleaned to avoid the residual slurry brought into the new color pattern, the slurry can not be added wrong. Change the position of the pattern without affecting the complex color. 5 Frame printing An unusual streaks of the pattern frame shape appear on the pattern near the mouth of the pattern. This is due to improper screens. Bad frame mounting, a gap varying from high to low or halftone conduction band is too small. Solution: Raise the height of the frame or flatten the frame, or handle the correct opening of the flower and the distance between the frame and the frame. 6 Chromatic aberration in one plate (squeegee unevenness or shades of light at intervals in the transverse direction of the fabric) Tc Fabric,Tc Jacquard Fabric,Cotton Jersey Knit Fabric,Stretch Jacquard Knit Fabric SHAOXING WUYUN TEXTILE CO.,LTD , https://www.kexintextile.com
October 30, 2021