1、 There is a problem with the transparency of the vacuum bag substrate
itself, crystal spots on the surface of the inner substrate, shark skin and
other quality problems, or the ink contaminates the packaging bag during
printing.
2、 The color of the adhesive is too dark. Because it requires high
transparency, try to avoid using dark yellow and dark red adhesives, and make
them colorless.
3、 Improper glue preparation procedure will lead to insufficient and
uniform mixing of main agent and curing agent. "Glue particles" may occur.
4、 Appearance defects, such as glue spots
5、 The temperature of drying tunnel is improper. If the temperature is too
high at the beginning of entering the drying tunnel, the concentration of glue
solution on the surface layer of the packaging bag will increase, and the
surface will be skinned and uneven.
A good product should be finely crafted. The food packaging bags, aluminum
foil bags and cooking bags produced by our company meet the food requirements
and have guaranteed quality.