Solvent-less Lamination Machine common problems and solutions

With the increasing hygiene requirements of consumers for food and drug packaging, the environmental protection standards of the packaging industry are more stringent. Solvent-free compounding, as a green environmental protection process, is being adopted by more and more flexible packaging printing enterprises. 

        However, the application of solvent-free composites is still in its infancy. Enterprises and personnel who have used solvent-free composites for the first time will encounter such abnormal process problems in the process implementation due to experience, but these are all causes. Can be solved, therefore, there is no need to panic for this, and there is no need to doubt the solvent-free composite process itself.

   Below, in the past few years, we have explored and promoted the solvent-free composite process, as well as the experience of training and service for customers, as well as several process anomalies, cause analysis and solutions encountered, and share them here.

       First, several links that should be paid attention to at the level of production operation

       Compared with solvent-based dry compounding, solvent-free compounding has the characteristics of “low initial tack, small coating amount, and long curing time”. Therefore, in actual production operations, the solvent-free composite process should be truly understood and mastered. , equipment characteristics, focus on several key links to reduce or eliminate quality accidents.

       First, for the characteristics of solvent-free composite "low initial adhesion", special attention should be paid to the control of the tension matching of the belt, the tension of the winding and the pressure during the production operation.

       Second, for the solvent-free composite "small coating amount", special attention should be paid to the uniformity of coating, composite uniformity, and tightness control of winding.

       Thirdly, for the solvent-free composite "long curing time", it should be sensitive to the fact that the curing process is actually a two-component glue reaction process, which has a great influence on the composite quality. Therefore, special attention should be paid to the curing conditions. (such as temperature, humidity, environment) settings, and monitoring of the curing process.

       Fourth, when using two-component solvent-free adhesives, special attention should be paid to the setting and monitoring of the glue mixing ratio. It is especially important to properly use and maintain the two-component automatic mixing machine to ensure that it is always in good condition. 

       In addition, the new composite structure adheres to the process test covering "parameter determination, peel strength, glue/ink/material compatibility, heat-sealed bag, friction coefficient change", etc., "Process test - small batch test The process of production - mass production should be a work system.