Molding Mechanism And Buffering Characteristics Of Biomass Cushion Packaging Material

With the environmental problems increasing seriously, in international and domestic packaging industry, environmental indicators are becoming important competition factors apart from price, quality, etc. Presently, the research and application of green cushion packaging products in the international and domestic markets mainly focus on molded pulp, corrugated board, honey comb board, and so on. But there are various problems with them, they are not the ideal packaging materials. Plant fiber cushion packaging materials become a hot research spot because of their disadvantages such as wide sources, good cushion performance, and degradable property.Biomass cushion packaging materials are made from plant fiber and starch through adding blowing agent to finish foam molding. In the foam molding, fiber stress and formation mechanism of bubble determine materials’cushion performance. Research home and abroad pay little attention on formation mechanism, and in this paper, formation mechanism and cushion performance of biomass cushion packaging material are studied and analyzed in detail. Research contents include:(1) The structure and performance of plant fiber and starch are analyzed, with the analysis results, the straw fiber and corn starch are chosen as research objects in this paper. Their manufacture process and technological parameters are studied and analyzed.(2) The formation mechanism of biomass cushion packaging material and fiber stresses are studied and analyzed, the results show that fiber stresses mainly include water bridge connection force and bending cohesive force. Water bridge connection makes fiber and fiber, fiber and starch link together, bending cohesive force makes fiber form a network, which makes up a network structure. The three stages of bubble growth are studied, bubble nucleation stage is an important stage which effects product performance most, through analysis, controlling method of air bubble is obtained. Through SEM analysis technology, the micro structure of biomass cushion material is analyzed.(3) The impact energy absorption performance, static compression and elasticity-back property of biomass cushion packaging material are analyzed through experiments, results show that fiber content influence cushion performance directly. Within fixed fiber scope in the experiments, increasing fiber content can improve cushion performance, and liquid paraffin can increase material plasticity, so it can be used as plasticzer.The study on formation mechanism and cushion performance of biomass cushion materials can provide theoretical foundation and method of improving their performance, and provide scientific basis of their widespread application.