1. Among the three resins of EVA-40W, MP-45, and CL-PP, CL-PP often brings high solvent residue, while EVA-40W brings low solvent residue. Therefore, under the condition of ensuring composite strength, the content of CL-PP can be appropriately reduced and the content of EVA-40W can be increased.

2. Choose the appropriate CL-PP. The solvent residue caused by CL-PP from different packaging box printing manufacturers in composite ink varies greatly. If the formula cost is acceptable, PP803MWS produced by Japanese paper can be selected. Under the same dosage conditions, it can generally be reduced to 50%.

3. When dissolving EVA-40W, MP-45, and CL-PP, adding a portion of ethyl ester and residual solvent reducer can effectively reduce the residual amount of toluene solvents in the ink film.

4. Check if the solvents used for ink and the solvents used for printing machine brushes are pure. If there are a few high boiling solvents, it may also cause excessive solvent residue and even lead to serious odors in the printed material.

5. Adjusting during the printing and lamination process of the packaging box:

① When manufacturing diluent solvents, try to minimize the use of toluene solvents and choose a mixed solvent of toluene: acetic acid: butanone=2:5:3;

② During the printing process of packaging boxes, increase the exhaust air in the printing machine's drying channel and appropriately increase the temperature of the drying channel. If conditions permit, the drying channel can be opened for repeated drying after white ink printing is completed;

③ During the printing process of packaging boxes, the viscosity of the ink can be appropriately reduced.