Plastisol Ink For Screen Printing

Physical properties

High hiding power: especially suitable for dark fabrics, can cover the underlying color and present high saturation color.

Elastic film: after heating and curing, it forms a flexible and wear-resistant film, with wet washing fastness of 5 (highest level) and dry rubbing fastness of 4 or above.

Fine printing: fine particles (can pass 350 mesh screen), support dot printing and complex pattern restoration, and the screen line accuracy can reach more than 8 lines.

Curing conditions

It is necessary to cross-link the PVC resin and plasticizer at high temperature to form an irreversible elastic structure. Typical process parameters are:

Temperature: 150-180°C (not less than 150°C)

Time: 1-3 minutes (time needs to be extended when thickness increases)

Equipment: tunnel dryer or infrared oven to ensure that heat penetrates the ink layer evenly.

Detection method: The cured ink should be elastic and the surface should not be scraped to powder, otherwise the temperature needs to be increased or the time needs to be extended.

Operation points
Screen selection: According to the effect requirements, 250-350 mesh is recommended for four-color printing, and 80-100 mesh is used for three-dimensional effects.

Scraper parameters: hardness 70 degrees, angle 40-60 degrees, to ensure uniform transfer of ink.

Dilution and thickening: Special diluents (such as Jiahua brand oil-opening water) are required to avoid blistering or powdering caused by solvents or water-based substances.

Screen Printing Ink

 

 

 

 

After printing, the ink surface is powdery and easy to fall off. What may be the reason? How to solve it? ​

This is usually caused by incomplete curing. The specific reasons and solutions are: ① Insufficient temperature (below 150°C): The temperature of the dryer needs to be increased to 150-180°C, and an infrared thermometer is used to confirm that the core temperature of the ink layer meets the standard; ② Time is too short: When thickening the ink layer, the curing time needs to be extended (such as 3mm thickness requires more than 3 minutes); ③ Fabric influence: White fabrics need 10-20% more curing time than dark fabrics due to heat reflection. After solving the problem, it can be verified by the "scratch test": Scratch it hard with your fingernails, and it is qualified if there is no powder falling off and the film is elastic. ​

Compared with water-based inks, which printing scenarios are more suitable for Plastisol Ink?​

Plastisol Ink is more suitable for the following scenarios: ① Printing on dark fabrics (high hiding power can cover the base color at one time without multiple overprints); ② Products that need to be washable and wear-resistant (such as sportswear and workwear, with wet wash fastness of level 5); ③ Special effect requirements (three-dimensional, fluorescent, beading and other processes, water-based inks can only achieve flat effects). Water-based inks are more suitable for light-colored fabrics, underwear that pursues breathability, or scenarios with strict requirements on VOC emissions (but their color fastness is low and they are easy to fade after multiple washings).

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