one
Determine which substrate to use, how to combine, and which ink and adhesive
to use based on the final use of vacuum packaging bags. The so-called end use
refers to the nature of the food that the packaging bag is mainly used for, and
the weight of the packaging. After packaging, it is important to understand how
high the temperature must be (121 ° C, 128 ° C, and even if there is a high
temperature steaming packaging bag, it can reach 140 ° C) to ensure a reasonable
cost-effectiveness of the packaging bag. Therefore, it is important to
understand the final use.
two
Determine process parameters. After determining the substrate and auxiliary
materials, consider these and place an order for production in the workshop. As
technical management and operators of workshop production, we must strictly
follow the requirements of the process sheet to receive and prepare materials,
and make sure not to make mistakes. When performing specific operations, it is
necessary to follow the process parameters of the process sheet, including the
number of lines and dot depth of the glue roller, the concentration of the
operating glue, the temperature of each heating section of the drying channel,
the size of the exhaust air volume of the blast quantum port, the speed of the
startup, as well as the control of unwinding tension, drying channel tension,
winding tension, surface temperature and composite pressure of the composite
steel roller, and so on. Among the above process parameters, the requirements
for adhesive amount (usually 4-5g/m2) and residual solvent amount (national
standard is less than 10mg/m2, preferably less than 3mg/m2 for enterprise
internal control) are the key to ensuring the internal quality of vacuum
packaging bags, and must be taken seriously.
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