Method for solving the phenomenon of scratching of silk printing color of cloth printing machine

The silk block printing on the cloth printing machine, the phenomenon of color scraping is common, is the main factor affecting the quality, can also be said to be a key to the wet cover wet silk printing. A certain factory produced a large amount of silk printing silk on the 5V type cloth printing machine in Switzerland, such as 09 electric spinning, 02 double twists, 66 sangpo satin, 54 veils, etc. The experience of solving the problem of color scratching is:

(1) Screen mesh number selection: In general, the higher the mesh number of the screen, the smaller the slurry volume per unit area of ​​the screen under the same colorant and squeegee conditions, the two side platens of the printed fabric. The less the remaining color paste (hereinafter referred to as "platen slurry"), the less the platen slurry is, the less likely it is to generate color scratches. According to the thickness and pattern of printed fabric, 21.2 mesh iL/cm (54 meshes), 27.9 meshes L/cm (71 meshes), 39.4 meshes/era (100 meshes) are selected. Screens with a higher mesh count but screens below 21.2 mesh}L/crn (54 mesh) are generally not used.

(2) Color paste viscosity selection: The lower viscosity color paste is good for preventing color scratching. This is because the lower the color paste viscosity is, the better the fluidity is, and the good fluidity of color paste is easier to control in printing. A small print gives a paste, and can guarantee the color uniformity of the flower color. However, when the paste with high viscosity controls the feeding amount of the smaller printing, it is often difficult to ensure the color uniformity of the design. In order to ensure the effect of the clamp, it is necessary to increase the amount of printing paste, so that the increase in the pulp of the platen is easy to produce the color tongue II. Therefore, the viscosity of the color paste is low, which helps to solve the color scratching. Of course, the viscosity of the color paste is too low, resulting in the infiltration of flower patterns, which of course is undesirable. In the production, the original paste of PA-40 was used to control the viscosity of the color paste at 14-18 dPa·s (measured with a rotating cylinder viscometer).

(3) Scratch carriage operation:

1 The choice of the squeegee printing mode: Select the floating pair mode, that is, the floating knife to go back, the single knife scraping back the form. The advantage is that scraping the single knife is easier to control the smaller feeding amount, and the single direction scraping is maintained - the non-operation is used to scrape the printing in the direction of the operation side, thus ensuring that the fabric completely removes the color scratching phenomenon at the operation side. Instead of operating the edge of the color scraping, Can be solved by adjusting the blade pressure, angle, speed and other methods.

2 Squeegee pressure selection: generally choose larger scraper pressure, because the larger scraper pressure can make the platen pulp between the non-operating edge platen and the fabric side be finished. If the pulp of the platen is not exhausted, it is easy to generate color scratches in the future only in the screen plate. On the squeegee printing apparatus, the pressure of the squeegee blade is from 0 to 10 for small to large readings, and the pressure reading for fabrics of different thicknesses is between 6 and 9.

3 Scraper angle selection: The blade rubber angle and angle adjuster provided by Busseur can obtain l50-65. Squeegee angle adjustment. In theory, the more the blade angle is clamped, the smaller the slurry supply; the smaller the blade angle, the larger the slurry supply. Then, choosing a larger squeegee angle should help prevent color scratching. However, in production, this is not entirely the case, and the scraper angle is increased to a certain extent, but it is easy to produce a color scratch. This is because the angle of the scraper is too large. In spite of the small amount of slurry to be fed, the amount of platen pulp produced by the screen itself is also small, but it is easy to scrape the pulp left on one or several screens into the fabric side. Of course, the squeegee angle is too small, resulting in a large amount of slurry, and a large amount of platen slurry, which can easily cause color scratching in the back screen. Therefore, it is necessary to select an appropriate squeegee angle, a thin fabric, and an appropriate angle of the squeegee; thick fabrics, the squeegee angle is appropriately small. For example 09 electric spinning with 550-60. The angle of the scraper is appropriate, with 25 in 54 satin. ~300 is appropriate (this angle is for reference only).

4 Squeegee speed adjustment: During scraping, the angle of the scraper must be appropriate and cannot be adjusted to a large extent. The amount of slurry fed at this time can be adjusted by the squeegee squeegee speed. The larger the squeegee speed, the smaller the amount of squeegee, and the less platen slurry. And it is good for the clarity of the outline of flowers. Therefore, it is advantageous to prevent color scratching by increasing the squeegee squeegee speed, and the squeegee angle can be used to control the plate amount.

(4) Using self-made gadgets: The practice of self-made gadgets is to pierce the pinholes with gelatin and stick the tape on the glossy surface for backup. This method uses a needle surface full of pinholes to hold up a very thin space to accommodate the platen slurry to prevent the color from being scraped in. When it is cut into the required size, the glossy surface is pasted on the screen plate where the color is scraped in. . This tool is mainly used to solve the problem of color scratching at the non-operational side of the screen.

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