Vacuum packaging bags, the vast majority are made by dry composite method, one of the few can also be used solvent-free composite method or co-extrusion method to manufacture. The quality of the dry compound is higher than that of the solvent-free compound, and the combination of the materials is also more reasonable and extensive than the co-extrusion. In China, the current 100 percent vacuum bags are made using dry composite method, so in this also talk about dry composite manufacturing process.
According to the end use of the vacuum bag to determine which substrate to use, how the combination, which kind of ink and adhesive. The so-called end use, refers to the packaging bag is mainly used for what nature of the food, the weight of packaging is how much. After packaging to withstand the high temperature (121 degrees, 128 degrees, there is a high temperature cooking bags can reach 140 degrees), so that the bag has a reasonable price, so it is important to figure out the end use.
Determine process parameters. In the determination of the substrate and auxiliary materials to consider these good, you can order to the workshop to produce. As the workshop production technology management and operation personnel, must be in strict accordance with the requirements of the process to go to collar, preparation, do not make a mistake. Specific operation, to follow the process of a single process parameters, including the number of coating roller and the depth of the network, the operation of the concentration of glue, drying the heating section of the temperature, the size of the blast port air volume, boot speed Of the level, as well as unwinding tension, bake road tension, winding tension control, composite steel roll surface temperature and composite pressure and so on. In the above process parameters, the amount of glue requirements (usually 4 ~ 5g / m2) and the amount of residual solvent requirements (national standard is less than 10mg / m2, the enterprise internal control is better than 3mg / m2), is a vacuum bag The intrinsic quality of the key must be taken seriously.
