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The benefits of printing with thermosetting ink on textiles are many. This is because the content of this ink is 100%, and its dry ingredients can remain suspended. When the ink is heated, the resin particles begin to fluff, swell, and absorb all the surrounding liquid. Fused together to form a uniform ink film. This happens when the ink film reaches 149 ~ 163 ° C. The boiling point of all liquid components is around 210 ° C. Therefore, no substances are volatilized during the curing process, and the printing pattern dots are clear. More:
1. Easy to store, no hardening, no peeling;
2. It does not volatile harmful substances during curing, which is environmentally friendly;
3. Can stay on the screen version for a few days without thickening, half a year will not block the version;
4. Saving ink during printing can save costs.
Although the benefits of thermosetting inks are many, printing a pattern is not simple. The number of screen lines for textile processing screen printing, the screen ratio of the plate making, and the printing method are different from those of paper, optical discs, and organic sheets.
First, stretch the net
Use yellow dyed wire mesh, aluminum mesh frame, stretch angle of 90 degrees, use 30min stretch method, tension reaches 22N / cm, and the tension of each version is the same.
30min stretch method:
1. Tension of warp and weft tension to half of the specified value at the same time;
2. Stable for 60s;
3. Then increase the tension by 2 ~ 4N / cm and stop for 60s;
4. Then increase the tension by 2 ~ 4N / cm to operate to the tension value;
5. Stabilize for 15min and stretch again to the standard tension value, but the tension of the LEM in the 30min stretch method may lose 6% ~ 10% after 24h, which mainly occurs within the first 4h, so it should be stabilized for at least 4 ~ 8h before drying Version.
Second, printing
1. Before printing, place the film under the screen, rotate the screen left and right through the light transmission table, observe the change of the interference pattern, and record the angle when the moire is the least, but the textile is textured, and knitting and woven also Different, it can be said that the textile itself will also produce moire, which requires increasing its eye-line ratio. My experience is that it must be 5 times or 7.5 times.
2. Use the exposure test piece to calculate the best exposure time through the test.
3. Use rubber cloth to evacuate and compact to expose. If a thick glass plate is used for compaction and exposure, water ripples may still occur, so special care should be taken.
4. After the exposure is completed, wet both sides with an adjustable spray head (connected to the tap water pressure). After 1 minute, spray the printing surface of the screen with a scattered water spray. Finally, rinse off the remaining glue on both sides and use absorbent paper Excess water will dry quickly.
5. After drying, carefully observe whether there is fog on the layout, because in this process, it may be exposed to indoor light for too long, drying time is too long, photosensitive resin storage time is too long or exposure time is short, the fog will appear At this time, use a wet towel to moisten the plate gently, and then dry it.
3. Printing
Printing is the same as screen selection, screen stretching, and photocopying. It must not be ambiguous. Not only must you master the important parameters of screen printing, but also have certain printing methods:
1. Use double-wheel transfer printing machine to print;
2. A far infrared numerical control oven is necessary;
3. Do not use square dots at 50% tone value, because it is the most difficult to print and is prone to problems such as moire and tone transfer;
4. Need precise printing platen;
5. Use as little scraper pressure as possible, use a scraper with a hardness of 60 °;
6. As small as possible the mesh distance, such as the fabric is highly hygroscopic without leaving the mesh distance;
7. As small as possible the rebound distance of the screen;
8. Each color must be dried.
Four, dry
The printing of thermosetting ink should be divided into two parts for drying.
1. After each color is printed, the background board is transferred to the oven and dried instantly (flash exposure). My far-infrared NC room baking oven is self-made, with a design capacity of 2400W, a 10s timer, and a magnetic touch switch. After the printing platen rotates to the bottom of the oven, when the magnet and the oven are 3 ~ 4cm up and down, corresponding to the reed switch, it starts to dry for 4 ~ 6s by itself. After the buzzer sounds, it turns the next platen to proceed to the next piece. It is dry and very easy to use. Only in this way can the printed dots be clear and sharp.
2. After printing, put it in a gas dryer to dry, but do not use an oven with a far-infrared heating tube to dry, because the solvent evaporates and the humidity will rust, the oven will be corroded. You can use the heat press machine to compress the silicon oil paper on the cloth sheet to ensure the firm degree.
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