When the printing mask packaging bag begins to be diluted, a special diluent must be added to the new ink to make the ink reach a viscosity suitable for printing. The correct dilution method is to slowly pour the solvent while stirring the ink, because the pigment particles in the ink are encapsulated in the resin and evenly distributed in the whole system. After the impact, the evenly distributed pigment particles are often exposed, losing their proper gloss and transparency, and reducing the printing effect. Composite packaging bag, aluminum foil bag, plastic packaging bag