(E) Special introduction of different grades of thermoset ink
The main components of PLASISOL mentioned earlier are PVC resins, plasticizers, pigments, and additives. First of all, the restriction standards for textile pollutants implemented by different countries and regions are different. For different standards, appropriate inks should be used to control production costs while meeting requirements. The following are some of the restricted substances, and the corresponding non-contained or content compliance inks: (LANCER products for example)
Contaminant source meets standard ink compliance requirements
Formaldehyde general water-based ink as a preservative All series of thermosetting inks do not require formaldehyde
Heavy metals Some additives and pigments contain heavy metals All series of choice Pigments and additives that do not contain heavy metals
AZO 23 azo dyes are mainly yellow red orange pigments all series pigment selection
Phalate Phthalates Plasticizer PF Series Other Plasticizers
PVCPVC resin without PVC series other resin
(VI) Heat Treatment
The use of PLASTISOL must be accompanied by heat treatment. When heated, the resin absorbs the surrounding plastic solvent and forms a plastic film. The adhesive is started at 80-120°C and is called semi-drying or flash-baking. The purpose is to avoid sticking. In the sudden temperature of 140-160 °C completely dry, only full baking, in order to make the ink completely dry curing! The role of heat treatment is very important, almost 90% of the problems are related to baking. The following aspects should be noted:
1. Insufficient handling will affect the fastness. When the water is washed, the ink will fall off, and the elasticity is not enough to be easily broken.
2. The film must be fully formed at the proper temperature.
3. Measure the temperature of the baked ink, not the temperature of the device.
4. Absorption of heat is a process, which is determined by two factors: temperature and time. A high temperature for a short time and a low temperature requires a long time, but it cannot be lower than the lowest polymerization temperature. Usually in order to speed up, the temperature is chosen at 160-165°C instead of 140°C.
5. When the film layer is thick, the degree of baking on the surface layer and the inside is different, and it takes a longer time, especially when printing a thick plate.
6. White clothes need longer reflection time, while black clothes absorb heat, heating time can be appropriately shortened due to different colors and different heat absorption of the fabric, the heating time can be adjusted accordingly.
7. It is best to use an infrared heating device because infrared rays penetrate the lower layers of the ink.
(7) Printing method
1, PLASISOL ink is a major feature is that the fine particles can be printed fine patterns. Therefore, only the proper film can make ink play its advantage. Therefore, it is best to use the film produced exclusively for printing by PLASISOL. For gradient colors, be careful not to lose dots when printing.
2, the choice of the network is also very important, different colors of the mesh sometimes will be different, for different colors of clothes, mesh requirements are not the same, in general, the dark mesh used by the mesh will be smaller. Recommended mesh:
Four-color: 250-350 mesh, outlet effect: 160-250 mesh, high cover ink/foam: 80-230 mesh, metal effect: 100-130 mesh, flash: 30-40 mesh, reflective: 81-110 mesh, Three-dimensional effect: 80-100 mesh.
3. For different components (cotton, chemical fiber), different colors of the fabric, the sense of the opponent, the color is different or want to achieve special effects, to select the appropriate ink series, or add different additives. For example: to print four-color reduction effect, should choose four primary colors series; dark clothes can use high hiding power ink; nylon fabric can choose elastic series; TC material to prevent disperse dyes in the fabric of the bleeding phenomenon, it is best to use anti-seepage White color base.
4, printing order: light-colored clothing light - dark (continuous printing) - drying 160 °C dark clothing
White - 120-140 °C bake to semi-dry - continuous printing color - drying as above.
5, blade hardness: 70 degrees, angle: 40-60 degrees, the frame and table spacing: 0.2-0.5CM; four-color thermosetting ink printing can be used 70 degrees, high cover ink can reduce the scraper hardness 60-65 degrees.
(8) Equipment required
1. T-shirt printing machine or walking platform. The surface of the countertop should be hard surface, and the printing effect of the fully automatic machine should be better than that of the manual, but the investment is large.
2. Oven: The best is the infrared oven. Generally, two kinds are required, one is a semi-drying (flash bake), which is used for baking a white background, and a printing process, and a swing or walk-through oven with a printing machine can be selected. At present, many factories use a hot air gun. The second is the conveyor tunnel oven, which is used for the final complete drying process. The length is chosen to be about 6-8 meters.
(9) Cost and printing speed
For light-colored clothing, the printing speed is similar to that of the water slurry. Dark-colored clothes need to be dried for 10-20 seconds before printing on white. General T-shirt front brooch (approximately A4 size), can print about 150-200 pieces per KG ink.