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Reduce the odor of packaging bags

by:Supouches Packaging     2022-01-06
For compliance with production control, the most important thing is to take measures to control the following types of odors that have the greatest impact: solvent residues in printing and compounding, resin decomposition and additive precipitation. One reason for the peculiar smell of packaging bags: control of residual solvents ①Printing substrate. Different printing substrates have different adsorption capacities for solvents used in printing. Printing substrates selectively adsorb solvents. PP materials have a large adsorption capacity for toluene. PVDC especially adsorbs toluene, and PA adsorbs alcohols. The statistical adsorption capacity of PA and PET is less than that of PP. ② Product structure. For product structures with poor barrier properties, such as BOPP/PE, the residual solvent undergoes processes such as drying room heating, slitting and rewinding. Especially volatile ethyl alkyd. For product structures with good outer barrier properties, such as KBOPP/PE, VNPET/PE, etc., the residual solvent is relatively high. For products with a double-layer barrier wall structure, the residue is the most difficult to control, and the most difficult afterwards, such as PET/VMPET/PE/K cellophane/AI/PE, PET/VMCPP, etc., the residual solvents enclosed in the composite layer . ③The control of the residual solvent of the peculiar smell of the packaging bag also includes: the printing picture, the releasability of the ink resin to the solvent, the purity of the solvent, and the solvent in the dry compound. The second reason for the peculiar smell of the packaging bag: The resin in the extrusion compounding is decomposed and the temperature of the T-shaped die is higher than 330℃. At such a high temperature, the resin thermally decomposes and thermal oxidation occurs with oxygen in the air. Produce peculiar smell. In order to reduce the peculiar smell, when squeezing, the resin temperature should be appropriately lowered if possible, and the die lip should be shortened. Different resins produce different odors. PP-based odors are slightly smaller, PE-based odors are larger, and EVA is more prone to odors due to poor thermal stability. There are a lot of additives in the resin, such as: heat stabilizers, antioxidants, slip agents, etc., overflow during the molding process is also an important reason for the peculiar smell. The third reason for the peculiar smell of the packaging bag: other aspects such as extrusion, film blowing, etc. A good exhaust function on the processing equipment is necessary. When making packaging bags, heating will also produce peculiar smells. On the one hand, the heat sealing temperature should be reduced as much as possible. On the other hand, good packaging bags should be placed for a while before wrapping.
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