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What problems should be paid attention to in the heat sealing of packaging bags?

by:XCBIO     2021-09-07
In the manufacturing process of packaging bags, heat sealing performance is a very important part of packaging bags. No matter which packaging bag, no matter which link is done well, as long as there is a problem in the heat sealing link, the other links will be wasted. The following problems often occur during heat sealing of packaging bags, which should be paid attention to. PO, PE, PP, OPP and other common single-layer film packaging bags. Generally they are relatively simple, and their heat-sealing process is also relatively simple, but some problems will arise. For example, some films have insufficient anti-pollution heat sealing performance, which will lead to incomplete heat sealing, leading to package leakage or air leakage; in other cases, the heat sealing temperature is too high, the pressure is too high, and the heat sealing time is too long, resulting in brittleness or sealing of the seal. Fuse; In some cases, the edge of the heat-sealing knife is irregular and blunt, the heat-sealing knife or the heat-sealing silicone pad is uneven, and the heat-sealing pressure is insufficient, resulting in an unclear or uneven contour of the heat-sealing cover. These problems are common problems in the production of some ordinary single-layer film packaging bags. These common problems are inevitable. Whether it is ordinary materials or fully biodegradable products materials, they can be solved by a slightly experienced teacher. There is another composite packaging bag. The type, thickness and quality of the heat-sealing layer material of the composite packaging bag directly affect the heat-sealing strength, so the heat-sealing problem of the composite packaging bag is much more complicated. Commonly used heat-sealing materials for composite packaging bags are CEP, LPPE, CPP, OPP, EVA, hot melt adhesive plasma resin co-extrusion or blending modified film. Since the thickness of the composite material heat-sealing layer is generally thick, its heat-sealing strength needs to increase with the increase of the heat-sealing thickness. In the bag making process, heat sealing involves temperature, and the temperature control is displayed by a thermometer. Generally, the temperature of ordinary single-layer materials is controlled at about 300-380°C, and the temperature of fully biodegradable products materials is generally controlled at about 250-300°C. In the process of heat-sealing composite packaging bags, the thinner the thermometer is, the better, and the error range generally does not exceed 5°C. The heat sealing temperature has a direct effect on the heat sealing strength, and the melting temperature of various materials directly determines the heat sealing temperature of the composite bag. The heat sealing requirements of composite bags are much higher than that of single-layer films. In the actual production process, due to the influence of the heat sealing pressure, the speed of the bag making machine and the thickness of the composite material, the smaller the heat sealing pressure, the higher the heat sealing temperature, the faster the machine speed, the thicker the surface material of the composite film, and the need for heat sealing The higher the temperature. However, if the heat-sealing temperature is too high, the heat-sealing material at the connecting edge will be easily damaged, and undercut will occur during melt extrusion, which will greatly reduce the heat-sealing strength of the seal and the impact resistance of the composite packaging bag. If the heat-sealing temperature is lower than the soft-bloom point of the heat-sealing material, no matter how to increase the pressure or extend the heat-sealing time, the heat-sealing layer will not be able to seal better. Due to insufficient pressure and low strength, leakage often occurs. Therefore, uniform pressure and temperature are one of the basic ways to reduce low strength and stratification. Therefore, in actual production, the heat-sealing temperature is often higher than the melting temperature of the heat-sealing material. In the process of making composite plastic bags, it is very important to adjust the appropriate temperature according to the material. Of course, different production processes, different machines, and different operation methods of each division will be different. According to actual operations, actual problems are actually handled.
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