How to reduce the amount of solvent residue when printing food packaging?

Solvent residue problem has always been a problem for ink companies. The country has already required the residue of benzene solvent to reach 3mg/m2 in the sanitary requirements of BOPP/PE composite packaging. With the constant demand for food hygiene How to improve the solvent residue in the brush of the food packaging printing machine has become a key issue for all ink companies.

1. Among the three resins of EVA-40W, MP-45 and CL-PP, CL-PP often has the highest solvent residue, and EVA-40W brings the least amount of solvent residue, so it can guarantee the composite strength. Under the conditions, the content of CL-PP can be appropriately reduced to increase the content of EVA-40W.

2. Choose the appropriate CL-PP. The solvent residues caused by different manufacturers of CL-PP in composite inks vary greatly. If the formulation cost is acceptable, PP803MWS produced by Nippon Paper can be used, which can be reduced to 50% under the same dosage.

3. When EVA-40W, MP-45 and CL-PP are dissolved, a part of ethyl ester and residual solvent reducing agent are added, which can effectively reduce the residual amount of toluene solvent in the ink film.

4. Check whether the solvent used for the ink and the solvent used in the printer brush are pure. If there is a small amount of high-boiling solvent, the solvent residue may be too high, and even the printed matter may have a serious odor.

5. Adjust during printing and compounding:

1 When preparing the dilution solvent, use a toluene solvent as little as possible, and a mixed solvent of toluene:acetic acid:butanone=2:5:3 may be used;

2 During the printing process, the exhaust air in the drying tunnel of the printing machine is increased, and the temperature of the drying tunnel is appropriately increased. If the conditions permit, the drying tunnel can be opened for drying after the white ink is printed;

3 The viscosity of the ink can be appropriately reduced during the printing process.

[Time: 2017-08-08 Source: Huayin Flexible Packaging]

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