Fabric screen printing failure analysis (2)

Second, osmotic ( paste, paste)

On the printed fabric, the outline of the pattern is unclear, the edges of the flower-shaped edges are rough, not clean, and the color and the color permeate each other, resulting in an undesired overlapping color, and even the pattern “coarse fat”, hair paste, and loss of three-dimensional effect. Inconsistent with the original.

cause:

1. The content of the fabric printing ink is insufficient to add the adjustment agent or too much water is added, the ink is too thin, loses the ability to resist the capillary effect of the fabric, spreads to the site outside the pattern, forms a pattern deformation, and is easily osmotic to the adjacent Discoloration on the pattern. If it is a multi-color overprint, the viscosity of several color inks will be poor, and mutual diffusion will occur, causing them to overlap each other, causing the pattern to become murky and the outline unclear.

2. During the printing operation, the slow running speed of the squeegee, the large pressure, the large amount of slurry, and the frequent number of round trips will cause the pattern to give too much ink, so it exceeds the amount of ink carried by the fabric, and the color ink bleeds toward the outside of the pattern. .

3. When the pattern area is large and the fabric has a large amount of pulp, the fabric after printing is stacked more for a long time, so that the humidity of the fabric is increased, and the floral flower paste easily spreads out, so that the outline of the pattern is unclear.

4. When the printing paste is mixed, the mixing is not uniform, or the printing paste is directly added with water to dilute, which affects or destroys the stability of the printing paste in the emulsified state and is hydrolyzed or slightly hydrolyzed to cause osmosis.

5. When printing on synthetic fabrics or on fabrics made of synthetic fibers and natural fibers, since the synthetic fibers are hydrophobic, the printing paste can be easily osmotized into the pattern.

6. The organization of thin fabrics sparse, the ability to absorb less pulp, a little more than the amount of colorant is prone to bleeding.


Source: "Guangdong Printing"