Problems and Solutions of PE Film's Poor Lamination in Dry Lamination
Nov 08, 2022
That is, the composite strength is very low or zero, which cannot meet the requirements of customers at all, resulting in product scrap. Due to the particularity of the PE film production process, low surface tension, high slip agent content, and surface pollution may all lead to poor lamination.
low surface tension
Under normal circumstances, the surface tension of the dry composite PE film must reach 38dyn/cm or more before it can be used.
Practice has proved that if the surface tension value of PE film is lower than 38dyn/cm, it may cause the phenomenon of low composite strength. Below 36dyn/cm will result in very low or zero composite strength. At the same time, the composite strength is also related to the thickness of the PE film. If it is less than 30 microns, it can be recombined at 36-38 dyn/cm. When the thickness is 30-50 microns and the surface tension value is 37 dyn/cm, depending on its composite structure, such as : OPP/PE, the composite effect can basically meet the requirements. However, when the thickness is greater than 50 microns, it is basically unusable when the thickness is less than 38 dyn/cm.
Here are a few sets of data for reference:
The surface tension value of PE film is very large when it is just produced, but with the passage of time, its surface tension value gradually decreases. Under normal circumstances, PE film can be stored for 3-6 months, but in high temperature and humidity in summer Seasonal storage period should not exceed 2 months.
Practice has proved that the surface tension value of PE film is closely related to the surrounding environment and the thickness of the film. Therefore, the placement of PE film should generally not exceed 3 months, especially in the rainy season, and more attention should be paid to the ventilation and ventilation of storage. If it is left for too long for some reason, in addition to the roll-by-roll inspection, it is necessary to comprehensively consider whether to continue to use the composite product according to the purpose of the composite product to avoid losses.
