The problem of heat sealing of composite packaging bags, all

The variety, thickness and material quality of the heat-sealing layer material of the composite packaging bag have the most direct influence on the heat-sealing strength. Therefore, today's professional flexible packaging manufacturers will summarize the heat-sealing problems of composite packaging. Commonly used heat sealing materials for composite packaging bags include CEP, LPPE, CPP, OPP, EVA, hot melt adhesive and other ionic resin co-extruded or blended modified films. The thickness of the heat sealing layer material is generally 20—80μfloat between m. In special cases, up to 100—200μm, the same heat-sealing material, its heat-sealing strength increases with the increase of heat-sealing thickness. For example, the heat seal strength of the retort bag is generally required to reach 40—50 Newton, therefore, its heat seal thickness should be 60—80μm or more. Temperature is involved in the process of heat sealing and bag making, and the temperature control is shown by a temperature meter. In the process of heat-sealing composite bags, the more precise the requirements for the thermometer, the better, and the error planning and setting value should preferably not be greater than±5°C. The heat-sealing temperature has the most direct influence on the heat-sealing strength, and the melting temperature of various materials directly determines the minimum heat-sealing temperature of the composite bag. In the actual production process, due to the influence of heat-sealing pressure, bag-making machine 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 required heat sealing temperature, the faster the machine speed, the thicker the surface layer material of the composite film, and the higher the required heat sealing temperature. If the heat sealing temperature is lower than the softening point of the heat sealing material, no matter how to increase the pressure or prolong the heat sealing time, the heat sealing layer cannot be sealed. However, if the heat sealing temperature is too high, it is very easy to damage the heat sealing material at the welding edge, and melt extrusion occurs.“undercut”This phenomenon greatly reduces the heat sealing strength of the seal and the impact resistance of the composite packaging bag. In the actual bag-making heat-sealing process, the pressure of the heat-sealing tool is often adjusted by a rotatable spring. The adjustment process is generally composed of two springs, which are divided into left and right ends. It is assumed that the pressure affects the heat sealing strength. The detection method is: take a composite packaging bag that is being processed and carefully observe the seam, assuming that the pressure is uniform and will not occur. Bubble and other phenomena; another method is to use a special lubricated bamboo block with a length of 500px, a width of 75px and a thickness of 5000px to conduct the experiment. Due to insufficient pressure and low strength, leakage often occurs, so uniform pressure and temperature are reduced. One of the basics of stratification.
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Qingdao Supouches Packaging Ltd. has had manufacturing experience for over flexible packaging solutions years. She currently runs a website where they sell . You can visit her site at Supouches Packaging.
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