Reasons for the difference in peel strength between layers and solutions
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The reasons for the low peel strength of the pearlescent film composite products mainly include the problem of interlayer peel strength and heat seal peel strength. Next, this article will focus on the causes and solutions that lead to poor peel strength between layers.
Reasons for poor peel strength between layers:
1 Pearlescent film material or printed BOPP material has low surface tension and does not meet printing or compounding requirements.
2 improper drying temperature control or a large amount of solvent used to affect the peel strength.
3 Printing ink is not compatible with the printed substrate, and the compatibility is not good.
4 The selected adhesive does not match.
5 The temperature of the composite oven is improperly controlled, which has a serious impact on solvent evaporation.
6 The composite roll temperature is too low.
7 There is a problem with the curing time or temperature control. The curing time of the two-component polyurethane adhesive is generally controlled at 24 to 48 hours, and the curing temperature is controlled at about 50%.
The solution is:
1 Improve the surface tension of the material. BOPP38 Dyne, PET50 Dyne.
2 Adjust the printing temperature or reduce the printing speed to adjust the solvent.
3 It is strictly forbidden to mix different resin system inks.
4 Replace the adhesive, it is recommended to choose a special adhesive. The main feature of the adhesive is that the colloid is soft, the anti-freezing property is particularly good, the product is not hard, the fluidity is low, the use cost is lower, the curing speed is fast, and the cutting process can be performed in 8 hours, and the suitability and the flatness of the product are good.
5 Increase the concentration of the glue, check the angle of the scraper, and measure the mesh depth and the number of lines of the rubberized roller.
6 The temperature adopts a low to high control method, and the wind speed of the exhaust system should be considered, or the speed of the composite machine should be reduced.
7 Increase the temperature of the composite roll. In fact, the temperature of the composite roll should have a great relationship with the speed of the machine and the thickness of the material, and it is also related to the nature of the glue.
8 Control the curing time and temperature.