Study On Motion Characteristics Of Bubbles Based On Solventless Laminating Mixing System

In this paper,the vacuum defoaming effect of solventless laminating glue was studied and analyzed for the bubbles in solventless laminate glue affecting the quality of solventless laminating products.Firstly,the gas-liquid two-phase flow theory was used to build the mathematical model,and the FLUENT pre-processing software was used to build the 3D model of the calculation domain of Solventless laminating glue in the vacuum defoaming stirring system developed by our research team.Through the simulation of the motion state of a single bubble in the solventless laminating A and B materials under the action of the impeller stirring system,the effects of the initial position of the bubbles,the stirring rotational speed and the viscosity of the solventless laminating glue on the motion characteristics of the bubble were analyzed,At the same time,the pressure field under the action of the impeller stirring system was simulated.The results of simulation showed,under the action of the impeller stirring system,a low pressure region appears near the impeller,which causes the bubble to rise to the position of the impeller and no longer rises,directly affecting the vacuum defoaming effect.Therefore,an improved scheme of the original vacuum defoaming impeller stirring structure of solventless laminating is proposed,through 3D modeling and simulation calculation,at the same time,the comparative analysis of the bubble motion characteristics under the action of the mixing system before and after the improvement,It is shown that the improved double helical ribbon stirring system can greatly improve the escape velocity of bubbles in the high-viscosity solventless laminating A material.Finally,the impeller stirring system and the double helical ribbon stirring system prototype were fabricated,and the experiment was carried out in the multi-phase flow laboratory using PIV measurement technology and digital image processing technology.The results of the experiment got the law of motion of the bubble under different stirring systems,and the correctness of the simulation results was verified.The results of the research can providetheoretical guidance for the development of efficient vacuum degassing system for solventless laminating.