Textile thermoset ink printing
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There are many advantages to using thermosetting ink printing for textiles. This is because the ink has a dry content of 100% and its dry content can be kept in suspension. When the ink is heated, the resin particles begin to soften, swell and absorb all the surrounding liquid. Fusing together to form a uniform ink film. This happens when the ink film reaches 149~163 °C, and all liquid components have a boiling point of about 210 °C. Therefore, no substance is volatilized during the curing process, and the printed pattern dots are clear, and other advantages are obtained. More:
1. Easy to store, not knotted, not skinned;
2. It does not volatilize harmful substances during curing and is environmentally friendly;
3. Can stay on the screen version for a few days will not thicken, half a year will not block the plate;
4. Saving ink during printing saves money.
Although the benefits of thermosetting inks are many, the printed patterns are not simple. The number of screen lines for screen printing, the line-to-eye ratio of printing plates, and the printing methods are not the same as those for paper, CD, and organic sheets.
First, the stretch net
Use yellow dyed wire mesh, aluminum mesh frame, the angle of the stretch net is 90 degrees, the tension is 22N/cm by 30min, and the tension of each plate is consistent.
30min stretch net method:
1. Tightening the warp and weft tension to half of the specified value;
2. Stable for 60s;
3. Then increase the tension by 2~4N/cm and pause for 60s;
4. Increase the tension by 2~4N/cm, and operate to the tension value;
5. Stable for 15min and stretched to the standard tension value again, but the tension of LEM in 30min may lose 6%~10% after 24h, which mainly occurs within the first 4h, so it should be stabilized for at least 4~8h. Version.
Second, the print version
1. Before the printing plate, the film is placed under the screen, and the screen is rotated left and right through the light transmission table to observe the change of the interference pattern, and the angle is recorded when the moiré is the least, but the textile is textured, knitted and woven. Differently, it can be said that the textile itself will also produce moiré, which requires an increase in the eye line ratio. My experience is to achieve 5 times or 7.5 times.
2. The exposure optimum time was determined by testing with an exposure test piece.
3. Use a rubber cloth to vacuum and compact the exposure. If the exposure is compacted with a thick glass plate, water ripple will still occur, so pay special attention.
4. After the exposure is over, use the adjustable nozzle (with the self-pressure of the self-contained water pipe) to wet the double-sided side for 1min, then spray the surface of the screen with the scattered water spray, and finally rinse off the two sides of the glue, suck it with absorbent paper. Excess water, dry quickly.
5. After drying, carefully observe whether there is fog in the layout, because in this process, it may be exposed to indoor light for too long, the drying time is too long, the photosensitive adhesive storage time is too long or the exposure time is short, fogging will occur. At this time, wet the towel with a wet towel and wipe it dry.
Third, printing
Printing is also the same as the selection of nets, stretch nets, and printing plates. It must not be vague. It is necessary not only to master the important parameters of screening printing, but also to have certain printing methods:
1. Printing using a two-wheel transfer flower machine;
2. A must far infrared infrared oven;
3. Do not use square dots at 50% tonal values, as they are the most difficult to print and prone to problems such as moiré and tone shifting;
4. Need precise printing platen;
5. Use a doctor blade with a hardness of 60° as small as possible;
6. As small as possible, such as the moisture absorption of the fabric, you can leave no network spacing;
7. The minimum rebound speed of the screen is as small as possible;
8. Every print must be dried.
Fourth, dry
The printing of thermosetting inks should be divided into two parts for drying.
1. After each color is printed, the background board is transferred to the oven for instant drying (flash exposure). My far-infrared CNC oven is self-made, with a design capacity of 2400W, a 10s timer, and a magnetic touch switch. When the printing platen is rotated to the bottom of the oven, when the magnet and the oven are up and down 3~4cm, it corresponds to the reed switch, and it is started to dry for 4~6s. After the buzzer sounds, the next platen is rotated to carry out the next piece. Dry, very easy to use, only in this way can ensure that the printed dots are clear and sharp.
2. After printing, put it in a gas dryer to dry, but do not use the oven of the far infrared heating tube to dry. Because the solvent volatilizes and the humidity is rusted, the oven can be pressed on the cloth with silicone paper to ensure the prison. degree.