Self-reliance bags do you really know? Come in and have a look!

Self-reliance bags, is a kind of the bottom of the level of support structure of flexible packaging bags, it can not use all the points and its open bag whether can stand independently. The sake of self-reliance bags leak key depends on polymer materials selection and heat sealing strength of two levels. 1, high polymer material selection self-reliance bags of raw material selection is very important for the containment, purpose is to improve the surface from the middle layer of isolation layer and the heat through the middle of the raw materials out of the heat sealing strength of intensity and bags. So the provisions plastic film on the surface of the composite interface tension must be more than 38 dyn/cm; Ultra-low temperature sealing characteristics of the inner heat sealing plastic film, the interfacial tension of thermal cover must be less than 34 dyn/cm; In addition, to adopt connection features good printing ink, high solids low viscosity adhesive, high purity solvents. 2, heat sealing strength, low heat sealing strength is also harm self-reliance bag packaging quality is one of the key elements of the leak. To be adjusted when heat sealing heat sealing temperature, heat sealing pressure and heat sealing time of matching. Very is to pay more attention to explore different tectonic bag heat sealing temperature, due to the different types of plastic film is not the same as the melting point, heat sealing temperature is different; Heat sealing pressure of work is not suitable for big, heat sealing time is not suitable for too long, in case of biological macromolecules dissolve heat through layer under the high temperature molten state by heat sealing knife cutting, lower the seal strength. Four layers that accumulate in addition, self-reliance bag the bottom of the bag, sealing is a more important part of the subject to sufficient after the experimental certification, can clear heat sealing temperature, heat sealing and heat sealing time working pressure. In the process of concrete, can according to the contents of different regulations on self-reliance bags leak experiment. Very simple way is to use, in a certain amount of gas is filled in the bag, will good sealing bag heat sealing, into the basin of water, hand squeeze the different parts of the packaging, if there is no air bubbles escape, indicates a fine bag sealing tightness; Otherwise shall promptly adjust leak steam heat sealing temperature and pressure. Self-reliance bags full of liquid, should be treated with caution, more can use extrusion and fall way to test the liquid leakage, when to add a certain amount of water filling inside the bag, seal shut up, can according to ac withstand voltage test methods.