1. How to solve the problem of flat screen imprint in fabric printing
Reason: The color rate of the screen frame is too deep; the frame frame is not properly glued; the color paste viscosity is too low.
Solution:
The color rate of the screen frame joint is too deep, resulting in horizontal joint printing. The opening version of the screen should be correct to prevent overlapping of street junctions and large patterns on the ground. Under the premise of not affecting the spirit of the pattern, cross-over can be considered to avoid overlapping of the straight lines at both ends of the screen.
Use meshes on the cloth surface of the mesh frame, such as window screens, thick nylon mesh and other fabrics for additional paste. When pasting, do not stick around the screen frame, select the width of the two ends of the screen frame to paste, so that there is a little gap between the lateral sides of the screen frame, without affecting the printing scratch, to avoid the appearance of imprint.
The viscosity of the color paste should be adjusted moderately, which is beneficial for the fabric to get a uniform paste and smooth patterns.
2. The solution to the phenomenon of plugging in the printing of flat mesh fabrics
Reasons: The density of the manuscript is not enough; the improper operation of the flat screen plate making; the quality of the printing paste.
Solution:
Manuscripts are currently produced on a computer. The graphic pattern of the manuscript to the higher the black density, the better the shading effect. If the blackness is not enough, the shading effect is worse, the ultraviolet light is easy to pass through, and it will cause a jam. The gray haze of the manuscript is lower. Done, it is easy to cause overexposure time and blockage.
Improper development and curing operation of flat screen platemaking will lead to plugging. When developing, it should be considered that the ultraviolet light is transferred from the printing surface of the screen to the printing surface. The printing surface has sufficient light and can be rinsed with high pressure water. Significantly tender, the residual slurry of pressureless water slurry should be used for washing when washing to avoid the residual slurry blocking the mesh. Before curing, double exposure should be carried out to make the adhesive layer fully photosensitive and then coated with curing agent.
When printing, the paste used contains impurities or undissolved particles that clog the mesh, so that the color paste cannot be scraped from the mesh during printing, so the paste should be filtered to remove impurities before use. When making the coating adhesive, choose a good quality adhesive and a thickener with good compatibility, and the film formation should not be too fast when scraping.
3. The generation process of the pattern edge from clear to fuzzy
At the beginning of printing, due to the good fluidity of the paste, the doctor blade can cut the paste clean without much force. With the continuous evaporation of water in the glue slurry, the slurry gradually thickens and the viscosity becomes larger. The size of the doctor blade must be increased to cut off the excess slurry. Due to the increase in strength, the screen deforms elastically to produce a pattern displacement. With the disappearance of the squeegee, the pattern edge of the screen printing surface will rebound to the paste after the screen rebounds. During the second printing, These slurries will move to the edge of the pattern, resulting in blurring of the pattern edge.
Solution:
(1) Use wire mesh with low elasticity, such as polyester wire mesh;
(2) Increase the tension of the wire mesh;
(3) Reduce the resilience of the wire mesh;
(4) Adjust the viscosity of the slurry at any time.
4. The causes of the sharp corners of the pattern becoming rounded and the loss of small dots
As the paste gradually thickens during the printing of the picture book, making it less fluid, the pressure of the squeegee must be increased when passing through the mesh to pass through the mesh, but the edge of the screen pattern is supported by the photosensitive glue. The doctor blade can not squeeze the slurry out of the mesh at any time, so that the slurry particles stay in the mesh to form a film, which causes the mesh on the edge of the photosensitive glue to block.
Solution:
(1) Use low mesh, monofilament, thin wire mesh;
(2) The photoresist should not be too thick;
(3) The slurry must maintain a certain fluidity at any time.
Steel Food Pan,Hotel Steel Tray,Kitchen Steel Service Tray,Serving Tray For Cooking
Jiangmen T2grand Stainless Steel Kitchenware Factory , https://www.yapamit.com