Reason: The color yield of the screen frame is too deep; the frame is improperly attached; the color paste viscosity is too low.
The color yield of the screen frame is too deep, resulting in horizontal plate printing. The open version of the screen must be correct to prevent street overlap, and the pattern of the big floor, without affecting the spirit of the pattern, cross-cutting can be considered to avoid overlapping of the horizontal lines at both ends of the screen.
The mesh surface of the frame selection of the use of mesh, such as screens, thick nylon mesh and other fabrics attached paste. When pasting, do not affix all around the frame. Select the width at both ends of the frame to paste so that there is a slight gap in the cross section between the frame and the frame. This does not affect the printing and squeegee basis and avoids platen printing.
The viscosity of the color paste should be moderately adjusted to make the fabric even and smooth.
2. Solution to plug network phenomenon in flat screen fabric printing
Reasons: The density of the manuscript film is not enough; the process of flat screen plate making is not proper; the quality of the printing paste is not good.
The manuscripts are currently produced by computer. The higher the pattern density of the artwork to the black density, the better the shading effect. If the darkness is not enough, the shading effect is poor, and the UV light is easily transmitted, which can cause plugging. The fog of the shading film is low. If the fog is high, the ultraviolet light is blocked, and the exposure time needs to be extended. Finished, this can easily lead to over-exposure and cause plugging.
Flat screen plate development and curing operation process will lead to plug network. During development, it is necessary to consider that the UV light is transmitted from the printing surface of the screen to the squeegee. The printing surface is fully illuminated and can be washed with a relatively large amount of water. The degree of cross-linking of the printing surface is smaller than that of the printing surface. Remarkably tender, flush with water-free pulp slurry to avoid residue slurry plugging the mesh. Before curing, double exposure is required to fully sensitize the adhesive layer and then coat the curing agent.
When printing, the used slurry contains impurities or undissolved particles to block the mesh so that the color paste cannot be scraped out of the mesh during printing, so the slurry should be filtered to remove impurities before use. Adhesives for the coating should be selected with good quality adhesives and good thickeners. The conjunctiva should not be too fast when printing.
3, the pattern of the edge from the clear to fuzzy generation process
Since the fluidity of the slurry is good at the beginning of the printing, the squeegee does not require a great deal of force to cut the slurry. As the moisture in the mortar continuously evaporates, the slurry becomes thicker and the viscosity becomes larger. The size of the squeegee must be increased to remove excess slurry. Due to the increase in the strength, the screen is elastically deformed to generate a pattern displacement. With the disappearance of the squeegee blade force, the pattern edge of the screen printing surface will stick to the slurry after the screen is rebounded. In the second printing, These slurries will move to the edges of the pattern, creating a blurring pattern.
(1) Use a small elastic mesh, such as a polyester mesh;
(2) increase the tension of the screen;
(3) Reduce the resilience of the screen;
(4) Adjust the viscosity of the slurry at any time.
4, the pattern of acute angle rounded, the reason for the loss of small outlets
As the slurry gradually thickens during the album printing process, the fluidity becomes smaller, and the pressure of the squeegee must be increased to pass through the mesh when passing through the mesh, but due to the splicing effect of the photosensitive adhesive at the edge of the screen pattern, The squeegee cannot squeeze the slurry out of the mesh at any time, so that the slurry stays in the mesh and forms a film, which results in blockage of the mesh at the edge of the photographic film.
(1) Select low mesh, monofilament, thin mesh;
(2) Photoresist can not be too thick;
(3) The slurry must maintain a certain degree of fluidity at any time.
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