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The broken bag rate of composite packaging bags is high, and the 7 major 'reasons' have finally been found!

by:Supouches Packaging     2022-08-30
The composite bag packaging bag will break the bag, which is caused by these 7 major sources. Professional flexible packaging manufacturers summarize 7 reasons for packaging, and help enterprises that use composite packaging bags in clothing, apparel, cosmetics, hardware electronics, food, etc. better selection of packaging products. 1. The influence of heat sealing temperature on the heat sealing strength is the most direct. The melting temperature of various materials directly determines the minimum heat sealing temperature of the composite bag. In the production process, due to the influence of heat-sealing pressure, bag-making speed and the thickness of the composite substrate, the actual heat-sealing temperature is often higher than the melting temperature of the heat-sealing material. The smaller the heat sealing pressure, the higher the heat sealing temperature; the faster the machine speed, the thicker the surface layer material of the composite film, and the higher the heat sealing temperature required. If the heat-sealing temperature is lower than the softening point of the heat-sealing material, no matter how to increase the pressure or extend the heat-sealing time, it is impossible to make the heat-sealing layer truly seal. However, if the heat sealing temperature is too high, it is very easy to damage the melt extrusion of the heat sealing material at the welding edge, resulting in“undercut”This phenomenon greatly reduces the heat sealing strength of the seal and the impact resistance of the bag. 2. The type, thickness and quality of the heat-sealing layer material have a selective effect on the heat-sealing strength. Generally, the commonly used heat-sealing materials for composite packaging include CPE, CPP, EVA, hot melt adhesive and some other ionic resins. Co-extrusion or blending Modified film. The thickness of the heat sealing layer material is generally 20 to 80μm between 100 and 200 in special casesμm. For the same heat-sealing material, its heat-sealing strength increases with the increase of heat-sealing thickness. The heat sealing strength of the cooking bag is generally required to be 40-50 Newtons, so the thickness of the heat-sealing material should be 60-80 Newtons.μm or more. 3. In order to achieve the ideal heat-sealing strength, a certain pressure is necessary. For light packaging bags, the heat-sealing pressure must reach at least 2kg/cm2, and it will increase correspondingly with the increase of the total thickness of the composite film. If the heat sealing pressure is short, it is difficult to achieve true fusion between the two films, and the heat sealing of the joint part is not good, and it may be difficult to remove the air bubbles trapped in the center of the weld, resulting in a virtual weld; of course, the heat sealing pressure is not as high as possible. Well, it should not damage the welding edge, because at a higher heat sealing temperature, the heat sealing material of the welding edge is already in a semi-melting state, and too much pressure can easily squeeze out part of the heat sealing material, so that the edge of the welding seam is formed. In the case of semi-blocking, the welding seam becomes brittle and the heat sealing strength decreases. 4. If the welding seam after heat sealing is not well cooled, it will not only affect the appearance flatness of the welding seam, but also have a certain influence on the heat sealing strength. The heat-sealed weld is shaped to eliminate the stress-concentration process. Therefore, the pressure is not good, the cooling water circulation is not smooth, the circulation volume is not good, the water temperature is too high, or the cooling is not timely, which will cause poor cooling, the heat sealing edge will warp, and the heat sealing strength will decrease. 5. The heat sealing time is mainly selected by the speed of the bag making machine. The heat sealing time is also a key factor affecting the sealing strength and appearance of the weld. At the same heat sealing temperature and pressure, if the heat sealing time is long, the heat sealing layer will be more fully fused and the bonding will be stronger. 6. The more times of heat sealing, the higher the strength of heat sealing. The number of longitudinal heat sealing depends on the ratio of the useful length of the longitudinal welding rod to the length of the bag; the number of transverse heat sealing is selected by the number of sets of transverse heat sealing equipment on the machine. Excellent heat sealing requires at least two times of heat sealing. The general bag making machine has two sets of hot knives, and the higher the degree of stacking of the hot knives, the better the heat sealing effect. 7. For composite films of the same structure and thickness, the higher the composite interlayer peel strength, the greater the heat seal strength. For products with low composite peel strength, the weld damage is often the first interlayer peeling of the composite film at the weld, resulting in The inner heat-sealing layer independently receives the damage tensile force, while the surface layer material loses its reinforcing effect, and the heat-sealing strength of the weld is greatly reduced. If the composite peel strength is large, the interlayer peeling at the welding edge will not occur, and the measured actual heat sealing strength is much larger.
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