Composite membrane crimp during production, the original is the way it is!

In the process of the composite film in the thin film composite due to various reasons such as machine, the temperature will lead to crimp composite good film. The following is our several kinds of cause analysis. Composite film base material for rolling tension and the effect of heating temperature, when they compound together, each other's different shrinkage rate, make the composite membrane produces internal stress, the internal stress distribution and balance determines the end crimp degree and state of the composite membrane. Composite membrane crimp will affect the roughness of membrane and bag opening edge material inward frizzy and impact the sealing operation. Composite membrane curly basic rule is as follows: 1. Lining material shrinkage rate, the greater the stiffness of the outer material at the same time the worse case, composite membrane of curl. Such as a. Tony/structure/PE composite membrane curly phenomenon is obvious, at the same time a. Tony / / CPP structure composite membrane crimp less phenomenon. 2. Composite membrane longitudinal crimp degree than horizontal crimp degree, and opening the longer length curly. Because of the composite membrane for the cause of the tension in the process of machining, the internal stress of longitudinal more apparent. Thus the same structure of bag making cross out the composite bags opening curly than the influence of longitudinal out bags. 3. Under normal conditions of composite products, dry products have a less crowded complex products warp phenomenon. Dry after product in a composite process part without high temperature setting, and composite products is quite good, less warp. 4. Improper control of the following factors can also affect degree of crimp composite membrane. 1) Compound tension control do not match. 2) The drying temperature or pressure of high temperature film shrink. 3) Winding crimping deformation caused by the pressure too. 4) Excessive curing ( Time is too long, temperature) Caused by thermal contraction.