Why bubbles appear in the packaging bag compounding process
If small bubbles appear in the composite material of the packaging bag, it will greatly affect the appearance, transparency, turbidity of the composite film, and also affect the peel strength. The factors that contribute to the formation of bubbles are very complex. Below, the Yite package editor will do the classification and analysis for you.
(1) The surface wettability of the substrate film is poor.
(2) Insufficient gluing.
(3) The adhesive has poor fluidity.
(4) adhesive mixed with moisture.
(5) The drying temperature is too high and the drying is too fast, causing the adhesive to bubble or form a film on the surface.
(6) When the composite roller is pressed, air is brought in, which makes the composite film contain bubbles. When the film hardness is high and the thickness is large, air bubbles enter more easily.
(7) The residual solvent is too high, and the solvent evaporates to form bubbles trapped in the membrane. It is necessary to regularly check the amount of air in the drying box.
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