How to use thermoset ink printing in textiles

The benefits of using thermoset ink printing for textiles are many. This is due to the fact that the ink content is 100% and the dry ingredients remain in suspension. When the ink is heated, the resin particles begin to soften, expand and absorb all the surrounding liquid and fuse. The uniform ink film is formed together. This happens when the ink film reaches 149~163°C. The boiling point of all the liquid components is about 210°C. Therefore, no matter is volatilized during the curing process. The printed pattern dots are clear, and Other advantages are more obvious. many:

1. Easy to store, non-stuck, and non-leather;

2. When cured, it is not environmentally harmful; it is environmentally friendly;

3. Can stay on the screen plate for a few days will not thicken, half a year will not block version;

4. Saving ink during printing saves money.

Although the benefits of thermosetting inks are numerous, the printed patterns are not simple. The number of screens for screen printing of textiles, the line of sight for making plates, and printing methods are not the same as those for paper, optical disks, and organic films.

First, stretch net

Using a yellow-dyed wire mesh, an aluminum mesh frame, and a stretch angle of 90 degrees, a 30-minute stretch net method was used to achieve a tension of 22 N/cm, and the tension of each plate was the same. 30min stretching method:

1. Tensioning warp and weft tension to half of the specified value at the same time;

2. Stable 60s;

3. Then increase the tension 2~4N/cm, pause 60s;

4. Increase the tension by 2~4N/cm to operate the tension value.

5. After stabilizing at 15 minutes, it stretched again to the standard tension value. However, after 30 minutes, the tension of the stretch netting LEM may lose 6% to 10% after 24 hours. It mainly occurs within the first 4 hours, so it should be stable for at least 4 to 8 hours before performing the drying. Version.

Second, print version

1. Before the printing, place the film under the screen, rotate the screen around the platen, observe the change of the interference pattern, record the angle when the pattern is the least, the textile is textured, and the knitting and weaving are also different. It can be said that the textiles themselves also produce moire, which requires an increase in the ratio of their eyes, and the experience is to achieve 5 times or 7.5 times.

2. Using the exposure test piece, the optimum exposure time was calculated by the test.

3. After vacuum exposure, the rubber blanket is used. If the exposure is still effected by compaction exposure with a thick glass plate, special attention should be paid.

4. After the exposure is over, use the adjustable nozzle (connected to the tap water pipe) to wet the two sides for 1 min and then spray the screen with a spray of water. Finally, flush the remaining glue on both sides and blot it with absorbent paper. Excess moisture and dry quickly.

5. After drying, carefully observe whether the layout has fog phenomenon, because in the process, it may be exposed to the indoor light for too long, the drying time is too long, the photosensitive plastic storage time is too long or the exposure time is shorter, there will be fog phenomenon At this time, we can use a wet towel to moisten the plate and dry it.

Third, printing

Printing is also the same as the selection network, stretch net, and print version, and it cannot be vague. It is not only necessary to master the important parameters of screen printing, but also has certain printing methods:

1. Use two-wheel printing machine printing;

2. Must have a far-infrared numerical control oven;

3. Do not use square dots at the 50% tone value because it is the most difficult to print and prone to moiré and color shift problems;

4. Need precise printing platen;

5. As little scraper pressure as possible, use a scraper with a hardness of 60°;

6. The smallest net distance possible, such as the fabric's strong hygroscopicity, can leave no net distance;

7. The smallest possible screen rebound distance;

8. Every ink must be dried.

Fourth, dry

Thermosetting ink printing should be divided into two parts for drying.

1. After each color is printed, the back plate goes to the oven for instant drying (flash exposure). Some far-infrared numerical control baking ovens are self-made, with a design capacity of 2400W, 10s timer, and magnetic touch switches. When the printing platen is turned to the bottom of the oven and the magnet and oven are 3~4cm above and below, it will correspond to the reed switch and start itself for 4~6s. After the buzzer sounds, it will turn the next platen to make the next one. Dry, very easy to use, the only way to ensure that the printed outlets are clear and sharp.

2. After printing, put it into a gas dryer to dry it, but do not use an oven with a far-infrared heating tube to dry it. Because the solvent evaporates and there is humidity, the oven will rust. You can use a heat press machine to pad the silicone oil sheet on the cloth sheet to press it firmly. degree.

Source: China Ink Technology Network