Common problems and solutions of the most popular

2022-08-07
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Common problems and solutions of glue printing

glue printing is widely used in clothing. Its advantage is that it can produce a special texture effect. It has elasticity. With the improvement of technical level, it has a good hand feel and can cover and print light colors on deep background colors. However, glue printing is prone to quality problems in the printing process

1. The generation process of pattern edges from clear to fuzzy

at the beginning of printing, due to the good fluidity of the slurry, the doctor blade does not need a lot of force to cut the slurry clean. With the continuous evaporation of water in the slurry, the slurry gradually thickens and the viscosity increases. It is necessary to increase the strength of the doctor blade to cut the excess slurry. As the force increases, the elastic deformation of the silk will produce pattern displacement. With the disappearance of the force of the doctor blade, the pattern edge of the printing surface of the printing plate will be anti adhered to the slurry after the silk rebounds. During the second printing, these slurry will be transferred to the pattern edge, resulting in the blurring of the pattern edge

solution: A. use silk with small elasticity, such as polyester; b. Increase the tension of silk; c. Reduce the elasticity of silk; Competitive advantage is basically a low-level comparative advantage supported by cheap labor. D. adjust the viscosity of the slurry at any time

2. Causes of sharp corners of the pattern becoming rounded and small spots missing

as the slurry gradually thickens during the printing process, its fluidity becomes smaller. When passing through the hole, the pressure of the doctor blade must be increased before it can pass through the hole. However, due to the support role of the photosensitive adhesive on the edge of the plate pattern, the doctor blade cannot squeeze the slurry out of the hole at any time, so that the slurry stays in the hole and forms a film, resulting in the blockage of the hole at the edge of the photosensitive adhesive

load control, strain control and displacement control can be achieved. The so-called three closed-loop control solutions: A. select low mesh, monofilament and thin filament; b. The photosensitive adhesive layer shall not be too thick; c. The slurry shall maintain a certain fluidity at any time

3. Reasons for the scaling phenomenon in the printing process

any printing size has a common characteristic, that is, the thinner the ink layer, the faster the drying. The same is true for glue. Because the size of the plate is larger than the pattern, there is enough space for the size in the plate to be stacked. It is impossible for the doctor blade to clean the size during each printing. In particular, thin ink layers are often generated above the pattern. These ink layers will form semi dry films in a short time. These films are brought into the holes by the doctor blade to plug the holes, forming a local blocking phenomenon

the solution to the quick fall back of the pendulum: use wooden strips between the pattern area and the frame of the plate to control the size within a certain range. The doctor blade can clean the size at the edge of the plate pattern every time, that is to say, it is impossible for the size to produce a thin ink layer within this range, so as to eliminate the scaling phenomenon

source: hot stamping

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