Analysis Of The Reasons For The Poor Peeling Strength Of Aluminum Foil Bags
Oct 13, 2022
Aluminum foil bag has good sealing, can effectively protect from light and moisture, and has the characteristics of wear resistance, flame retardant, anti-seepage, pressure resistance and good toughness. During processing, the high temperature makes the solvent not completely volatilize after winding and curing (unit time), resulting in excessive residual solvent, and the swelling of the residual solvent in the adhesive layer will reduce the fastness and adhesion of the adhesive layer, resulting in a decrease in its peeling strength. How can this situation be solved? What are some ways to eliminate its effect on peel strength? Let's analyze it for you.
1. Before preparation, check whether the purity of the solvent exceeds the standard, if it exceeds the standard, it is necessary to take measures to reduce the purity to the qualified level before proceeding to the next step.
2. Increase the concentration of the working fluid, increase the gluing layer, confirm the depth of the anilox roller, and ensure that the dry base content reaches more than 4g.
3. Test the grease of the aluminum foil bag to see if there is excess grease, if it is unqualified, it should be stopped.
4. Try to use nylon film with a wetting tension of 52 dyne.
5. PA film should be used immediately after unpacking, if it is not used up, it should be wrapped in aluminum foil, sealed for reserve, and cured in the insulation room for 1-2 hours.
6. Because the moisture content of PA film, ethyl ester and air in a high temperature and high humidity environment exceeds the standard, the compounding speed cannot be too fast, but it should be moderate, when compounding on the machine with a long drying channel, it is necessary to pay attention to the appropriate increase in temperature and air volume, and strive to evaporate the residual solvent as much as possible before winding to improve the temperature and time of extended curing.
