Application, operation and performance of the hott

2022-08-14
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Application, operation and performance of environmental friendly low-temperature thermosetting ink

thermosetting ink is called plastisol in English, which is also known as plastic melt ink and oily mastic; It is a resin based non solvent ink, mainly composed of resin (excluding solvent and water), plasticizer, pigment and other additives, with a solid content of 100%. Generally, the composition of water-based and oil-based inks is binder (resin), solvent or water, pigment and other additives, with a solid content of%

characteristics of plastisol:

1. The appearance is paste like and thixotropic. It is thicker when placed and will become thinner when stirred. Temperature will affect the viscosity. Therefore, the viscosity is low in summer, and the ink is relatively thin. In winter, it is the opposite

2. Because plastisol does not contain solvents, the volatile amount is very small at room temperature. When heated to a certain temperature, cross-linking reaction takes place and it solidifies. Therefore, it will not dry at room temperature, which brings great convenience to use and storage. When cured, it forms a flexible film and is closely combined with fiber analysis. At the same time, it also gives itself the following characteristics: no plug; Don't wash the edition after work; It can be printed with 350 meshes, and the line can reach more than 8 lines --- the pattern is fine; When printing dot, it can be wet cover wet continuous printing, which can improve work efficiency; Dot printing has good breathability and soft feel; No waste --- the consumption is 1/3 less than that of mastic. The market value of plastic machinery orders in the United States in the fourth quarter increased by 3 percentage points 1/2 compared with the third quarter of 2013; It has elasticity and adhesion fastness up to 5 levels for wet washing and 4 levels for dry wiping; Dark and light fabrics can be printed; Variety diversity, can print many three-dimensional right angles, rounded corners, stone effects and other special products. In the snow, the slippery floor can achieve the anti-skid effect of level 4

plastisol ink combines the advantages of water slurry, glue slurry and traditional solvent based ink: the printing fineness and special effect cannot be achieved by other printing materials

scope of application:

thermosetting ink (plastisol) is applicable to 100% cotton, cotton/polyester blend, polyester, dark and light colored cloth, denim and other fabrics. All fabrics that meet the following two points can be used: 1. 150 C; 2. It has air permeability and allows ink to penetrate. Unsuitable substrates such as plastic, metal, glass, etc. and nylon cloth with waterproof treatment

the use of thermosetting ink (plastisol) must be accompanied by heat treatment. When heated, the resin absorbs the surrounding plastic solvent and glues together to form a film, so as not to stick to the plate. Dry it completely at the sudden closing temperature, i.e. C. only when it is fully baked can the ink be completely dried and plasticized! The role of heat treatment is very important. Almost 90% of the problems are related to baking. Pay attention to the following aspects:

1 Insufficient treatment will affect the fastness. When washing, the ink will fall off, and the elasticity is not enough, which is easy to be broken

2. Only at a suitable temperature can the adhesive film of the ink be fully formed

3. Measure the temperature of the baked ink, not the temperature of the device

4. Heat absorption is a process, which is determined by two factors: temperature and time. High temperature takes a short time, while low temperature takes a long time. However, it cannot be lower than the lowest polymerization temperature. Usually, in order to speed up the speed, the temperature is selected at C instead of 130 C. (generally, the actual operation shall prevail)

5 When the film layer is thick, the baking degree of the surface layer and the inside is different, and the time needs to be extended, especially when printing thick plate effect

6. The reflection time of white clothes needs to be lengthened, while the structural heat of black clothes can be constantly changed while the cells grow. The heating time can be appropriately shortened. Due to the different heat absorbed by different colors and fabrics, the heating time can be adjusted accordingly

7. It is best to use infrared heating equipment, because infrared ray has a penetrating effect, which can dry the low layer of ink thoroughly

8. Changes in climate and environment will affect the viscosity of thermosetting inks. Diluents or thickeners (no more than 3%) can be added as needed

9. Water based printing colors cannot be mixed with thermosetting inks

10. The edges of the pattern are uneven, the knife is too much, or the ink is too thin

11. The curing temperature of bubbles in or on the surface of thick film pattern is not high enough or the time is not long enough

printing method

1. A major feature of thermosetting ink (plastisol) is that fine particles can be printed with fine patterns. Therefore, only the appropriate film can make the ink give full play to its advantages. Therefore, it is best to use the film specially printed with plastisol, and pay attention not to lose points when printing the gradient color and plate

2. The choice of purpose is also very important. The eyes of different colors are sometimes different, and the eye requirements are different for clothes of different colors. Generally speaking, the number of objects used for dark clothes will be smaller. Recommended eyes: four colors: 250, 350 eyes, dot effect: 160, 250 eyes, high covering ink/foam: 80230 eyes, metal effect: 100130 eyes, flash: 3040 eyes, reflection: 81110 eyes, three-dimensional effect: eyes. (the edges of the flowers printed on the sun Xu Wen board are more neat)

3 For fabrics with different ingredients (cotton, chemical fiber) and colors, the requirements for feel and color are different, or to achieve special effects, we should choose the appropriate ink series, or add different additives. For example, if you want to print four-color restoration effect, you should choose four primary color series; Ink with high hiding power can be used for deep clothes; Nylon fabric can choose elastic series; In order to prevent the color seepage of disperse dyes in the fabric, it is best to use anti-seepage color white as the backing first. For printing thermosetting ink, the backing should be diluted with ink and water, which is about one fourth thinner than surface printing ink. The backing should be forced. Generally speaking, this kind of firmness will be much better

4. Printing sequence: light color clothing light color dark color (continuous printing) - dry dark clothes at 160 C,

white background - C dry to half dry - continuous printing - dry as above

5. Scraper hardness: 70 degrees, angle: 4060 degrees, distance between frame and bedplate: 0.2 0.5cm; Four color thermosetting ink printing can be used at 70 degrees, and high covering ink can reduce the hardness of the scraper by 60 to 65 degrees

required equipment

1. T-shirt printing machine or walking platform. The table top should be hard faced, and the printing effect of all automata is better than that of manual work, but the investment is large

2. oven: it is better to use infrared oven. Generally, there are two kinds. One is used for baking the white bottom and semi drying (flash drying) in the printing process. You can choose the swing or walking oven equipped with the printing machine. At present, many factories use hot air guns (industrial air guns/fire air guns). The second is the conveyor belt tunnel oven, which is used for the final thorough drying to achieve the purpose of sand fixation. The length is about 68 meters

cost and printing speed

for light colored clothes, the printing speed is similar to that of water slurry. For dark colored clothes, it takes 10 to 20 seconds to dry the white background first. Generally, the front breast flower of T-shirt (about A4 size) can print 150 or 200 pieces per kg of ink

viscose bead process

fillet transparent thermosetting ink (oily adhesive bead paste) is suitable for bonding plastic beads. The adhesion fastness can reach grade 4 or above by wet washing and dry wiping. (washing machine 45 degrees continuously for 10 hours without falling off!) Print the rounded corner on the cloth, sprinkle plastic beads while it is wet, dry at 160 degrees or press with a press ironer at 150~160 degrees for 8~15 seconds. It can also be used for bronzing

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