The Study On Regeneration And Reuse Of Paper/Plastic/Aluminum Flexible Packaging Composite

Paper/plastic/aluminum flexible packaging composite (FPA) are widely used in daily lifein the packaging of milk, fruit juice and other packaging materials. It contain good qualitylong wood fiber, plastic of polyethylene and aluminum foil. After abandoned, FPA cause agreat resource waste and environmental pollution. This paper focus on studying the initialprocessing of FPA in raw mode and preparation of high-performance composite materials.This paper adopt the equipment commonly used in polymer processing for FPA initialprocessing. Researching on the ways of suitable initial processing. The purpose of initialprocessing is to cooperate large size, original FPA into fragmentation, good dispersancy ofpretreatment mixture. The ways of using double screw pretreating and mixer initial processingdifferent sizes FPA to get effect of fragmentation and dispersion is discussed. Using inorganicparticle initial processing strengthen in the process of fragmentation and dispersion effect.Research has found that filaments FPA fragmentation and dispersion effect is better than thatof the cubes FPA when using twin-screw pretreating blended with HDPE; Calcium carbonate(CaCO3) initial processing can get better effect of fragmentation and dispersion.After initial processing, regenerative composite are prepared with polyethylene (HDPE).In order to get high performance of composite, two parts of the job are done mainly. First, thepaper analyzes the relationship between internal structure and mechanical properties: thechange of aluminum foil, long wooden fiber, inorganic particles on structure under initialprocessing and compatilizer on mechanical properties. Results show that after eliminating thealuminum foil indirectly cause wood fiber structure change; MAPE and silane coupling agentcan capacity of weak interface; FPA wood fiber and inorganic particles can improve thebending performance of composite material, but lower toughness.Second, further study on its rheological properties，as the system content HDPE matrixphase, interface and long wooden fiber network, and other forms of relaxation exercisemultiple structure. The rheological behavior of shear is thinning and entrance effect areanalyzed by using capillary rheometer.The effect of internal structure on viscoelastic system isstudied. By means of studying the internal structure and modular character impact the criticalsteady-state processing speed, the characteristics of elastic energy storage in unstable flowfield analyzed. The internal structure of materials and the relationship between the unstableflow are determined. Its rheological properties are use to direct extrusion processingtechnology and design formula.The results show that the high content of FPA system ofelastic energy storage and stress concentration phenomenon rather than the low content; Inorganic particles initial processing and silane coupling agent can increase the elasticity ofsystem. Instable flow come out under low extrusion rate and the second extrusion smooth areaappeared in the test range at the same time; Compatilizer MAPE can accelerate the interfacerelaxation under the same shearing action. The elastic energy storage is reduced and unstableflow pressure oscillation amplitude decrease.