Woven bag printing adhesive adhesion and adhesion failure analysis

1. Adhesion is not strong

Reasons: (1) The surface of the substrate and the surface of the film or woven bag are too smooth (untreated or not handled properly); (2) The ink and the complex (that is, the auxiliary agent) are improperly selected or used insufficiently; (3) The ink system The ability to dissolve hydrogen bonds is too different from the ability of a woven bag substrate to dissolve hydrogen bonds.

Remedy: (1) The surface of the woven bag substrate should be approximately 38 Dyne; (2) Add 5% of chlorinated paraffin before stretching the plastic braided wire; (3) Select the ink carefully (same property); (4) Should try to use a small viscosity and high resin content in the ink system as well; (5) increase the printing pressure.

2. Printing product adhesion

Reasons: (1) adhesion during printing or after rewinding; (2) over rewinding due to excessive printing speed; (3) improper drying device angle or failure; (4) ink drying is too slow ( 5) The storage stack is under excessive pressure; (6) The temperature is too high and the cooling is not complete or the ink is not heat-resistant; (7) The ink is too thin, resulting in through-printing.

Remedy: (1) adjust the printing speed, adjust the drying device angle; (2) improve the ink dry (or add 90% ethanol and 10% ethyl mixed diluent); (3) less stacking or storage load when printing To be light; (4) to reduce the temperature of the workshop or warehouse (open the window door to make air convection, etc.), replace the heat-resistant woven bag ink; (5) add the original ink to increase its viscosity or add a small molecular weight and volatile solvent dilution (It is recommended to use the special thinner produced by the ink factory).

Source: Ke Yin Media

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