The high compound pressure of the hot melt adhesive composite machine or the unequal pressure at both ends of the composite roller will cause the surface wrinkle of the composite film, and the empty tunnel is formed at the compound folds, which affects the fastness of the finished product. Generally speaking, there are three ways to increase the amount of glue, increase the compound pressure and choose the appropriate drying temperature. Now take a look at the details.
(1) increase the amount of glue, too little amount of glue or part of the substrate is not coated with adhesive, which will cause the two substrate to be bonded when combined. We can choose a mesh roller with a deeper mesh, or increase the amount of coating on the substrate by increasing the pressure of the rubber roll and reducing the contact pressure between the scraper and the reticulated roll. For some plastic film substrates, the corona treatment can be carried out before coating to make the surface of the HP, so as to improve the ability of the substrate to adsorb the adhesive and increase the amount of the coating on the surface.
(2) if the compound pressure is increased properly, the composite pressure is too large or the pressure of the two ends of the composite roller is not uniform, the surface wrinkles of the composite film will be caused, and the empty tunnel is formed at the compound folds, which will affect the fastness of the finished product. Increasing compound pressure appropriately is beneficial to improve composite bonding force. In addition, in order to improve the bonding effect of the composite film and the quality of the milk packaging, we should try to avoid the adhesion of foreign objects, dust and other impurities on the adhesive or the composite surface of the base material. When concluding a language, we should carefully observe all kinds of problems and failures in the production process, and use these methods to troubleshoot. When there are many problems or failures, a single method may not be able to take account of it.
(3) if the suitable drying temperature is too high or too low, the bonding fastness of the composite film will be affected. When the drying temperature is too high or the high temperature is cooked, the surface of the adhesive will be carbonized, which will destroy the bonding ability of the adhesive. When the drying temperature is too low, the viscosity of the adhesive is poor and the viscosity of the adhesive is poor. After a period of time, it is easy to form bubbles in the composite membrane and destroy the compound quality of the product. Of course, we can choose high temperature and good cooking adhesive digital printing presses to adapt to higher temperature drying, such as polyurethane adhesives.
What are the advantages of the environment-friendly hot-melt adhesive machine?
1, the temperature uses the precise PID intelligent control.
2, precision filter device to remove impurities and prevent nozzle blockage.
3, gear pump adopts frequency conversion speed control to control the output of glue accurately.
4, hot melt machine control system has high and low temperature protection function, prevent equipment damage.
5, the inner surface of the glue box adopts Teflon coating to prevent charring, ensure the beststate and reduce blockage.
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