The influence of technological parameters on the dynamic behavior of 'liquid wood' samples obtained by injection molding

摘要

The plastic products contribute to environmental pollution. Replacing the plastic materials with biodegradable materials with superior properties is an absolute necessity and important research direction for the near future. The first steps in this regard were the creation of composite materials containing natural fibers with positive effects on the environment that have penetrated in different fields. The bioplastics and biocomposites made from natural fibers is a topical solution. The next step was made towards obtaining biodegradable and recyclable materials based on cellulose, lignin and no carcinogens. In this category fall the "liquid wood" with a use up to five times without affecting the mechanical properties. "Liquid wood" is a high quality thermoplastic biocomposite. "Liquid wood" is a biopolymer composite divided in three categories, ARBOFORM, ARBOBLEND and ARBOFILL, which have differed composition in terms of lignin percentage, being delivered by Tecnaro, as granules, [1]. The paper's research was focus on Arboform L V3 Nature and Arboform L V3 Nature reinforced with aramid fiber. In the experimental plan were taken into account six parameters (D_(inj) - direction of injection [°]; T_(top) - melting temperature [°C]; P_(inj) - injection pressure [MPa] S_s - speed [m/min]; t_(inj) - injection time [s] and t_c - cooling time [s]) each with two levels, research carried on by Taguchi methodology. Processing Taguchi method allowed both Taguchi setting work parameters influence on storage modulus and damping as the size and influence their ranking. Experimental research concerning the influence technological parameters on storage modulus of samples obtained by injection from Arboform L V3 Nature yielded an average of 6055MPa and descending order as follows: T_(rac), S_s, P_(inj), D_(inj) and T_(top). The average of model for reinforced material was 6419MPa and descending order of parameters influence such as: D_(inj), T_(rac), T_(top), t_(inj), S_s and P_(inj).