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What is the relationship between the width and width of the composite material and the adhesive edge
Aug 01, 2018

The solution to the relationship between the width and the width of the composite material composite is to increase the width of the composite substrate. Under normal circumstances, the width of the composite substrate is 1cm wider than the printed film, that is, 0.5mm wide on both sides, which is beneficial to avoid the occurrence of adhesive edge failure.

There is also a solution - the "invert" method, that is, the composite film is compounded as a "composite substrate" to avoid "sticky edge" failure. However, this method is only applicable to BOPP/OPP composite structures or OPP/PET composite structures.

At the time of sizing the composite substrate, it should be noted that the rubberized surface cannot be reversed, and it is necessary to apply glue on the corona treatment surface of the film.

In the case of dry lamination, the function of the pressure roller is to compact the film and the coating roll so that the coating is uniform and no bubbles are generated. The width of the pressure roller is generally 0.5mm narrower than the width of the film. If the width is uniform or large, when the glue is applied, the glue on the rubber roller is pressed by the hot steel roller, which is easy to cause the edge of the finished product to be curled, especially when the product is wound. When the composite structure is PA/CPE, the most likely sticking occurs.

In addition, the printed substrate is not flat, and it oscillates left and right during operation, and displacement occurs during compounding, which tends to cause sticking. The solution is as follows: the printing substrate is first rolled and flattened by a flattening machine to ensure that it does not displace during the compounding, and the glue is not attached, so that the stuck edge of the finished product can be avoided. For the high-speed dry laminating machine, since there is electric eye tracking, there is no need to flatten the processing.

The edge sticking fault is also related to the hardness of the top roller. After using the two-component rubber roller for a period of time, it is prone to "hardening" phenomenon, lack of elasticity, and it is easy to produce glue overflow phenomenon when the glue is applied. The overflowing glue "runs" toward both sides, which creates conditions for the adhesive edge. The solution is as follows: the rubberizing roller is placed in a curing chamber of about 50 ° C for 1 to 2 hours to reduce the degree of hardening and improve the surface elasticity, so that the glue is evenly coated to ensure that the glue does not overflow, thereby reducing the occurrence of adhesive edges. The chance.

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