The main substances with an important effect over any company development are the materials which require simple or complex manufacturing processes. In the near future the using of recyclable materials will become an extremely important factor in all of activity fields. Therefore, liquid wood, due to its biodegradability and mechanical properties superior to other plastics, could replace some plastic materials soon. In case of arboform the granules made from: lignocellulosic fibers (combination of cellulose, lignin and wood polyoses); natural Polymers: lignin, polyester; natural resins/waxes: aliphatic and aromatic ketones, alcohols, carbonic acids, lactones and polycycles in monomeric, oligomeric and polymeric form. In case of arbofill it made from petrochemical polymers like polypropylene or polyethylene, reinforced with natural fibres like hemp, flax or wood. The arboblend contains different biopolymers like e.g. polyhydroxialkanoate, polyester, ingeo TM, lignin, starch, cellulose, organic additives, natural resins or waxes and natural reinforcing fibers, [. Because the injection process of arboform L, V3 Nature was very difficult this material was reinforced with 5% aramid fibers. The properties of liquid wood are very important to be known take into account the possibility to find some plastic materials for replacing. Therefore the paper presents some aspects of research concerning the impact resistance of these materials. For that was used the injection process to obtain the samples with six input parameters inside of experimental plan. Each factor had two level and was used the Taguchi methodology. The results obtained and the plastic materials that could be replaced are as follow: arbofill Fichte: (11-15) kJ/mp and it could be replace the PC GF 30, PPE GF 30, PEEK GF 30 (Poly Ether Ether Ketone Glass Filled), PEEK CF 30 (Poly Ether Ether Ketone Carbon Filled), PEI GF 30 (Poly Ether Imide); arboblend V2 Nature: (20-26) kJ/mp and it could be replace the PA 66 GF 30, PA 11 GF 30, PC GF 30, PP GF 30, PMMA, PPE GF 30, PEEK GF 30 (Poly Ether Ether Ketone Glass Filled), PEEK CF 30 (Poly Ether Ether Ketone Carbon Filled), PEI GF 30 (Poly Ether Imide) and arboform L, V3 Nature reinforced with aramid fibers: (8-14) kJ/mp and it could be replace the PC GF 30 (30% glass fiber), PVC, PPE GF 30, PEEK GF 30 (Poly Ether Ether Ketone Glass Filled), PEEK CF 30 (Poly Ether Ether Ketone Carbon Filled), PEI GF 30 (Poly Ether Imide).

Petroleum-based plastic materials constitute a major environmental problem due to their low biodegradability and accumulation in various environments. Therefore, searching for novel biodegradable plastics is received particular attention. Our studied material, “Liquid wood” produced from lignin, natural fibres and natural additives, is completely biodegradable in natural environment, in normal conditions. This paper presents the behaviour of Arboform and Arboform reinforced with Aramidic Fibers tensile test analysis. Experimental data show that the tensile strength reached an average value of 15.8 MPa, the modulus of elasticity after tests is 3513.3MPA for Arboform and for the reinforcement the tensile strength is 23.625MPa, the modulus of elasticity after tests is 3411.5MPA, the materials present a brittle behaviour. The high mechanical properties of newly developed material, better than of other ordinary plastics, recommend it as a potential environment-friendly substituent for synthetic plastics, which are present in all fields of activity.

The researches made in the last years have shown that lignin is a substance that gives wood strength. It can be found in the granular form that can be melted and injected. Lignin is used to obtain material with multiple uses such as electronics, food containers etc. This material is known as "liquid wood". Fibers with high specific resistance and high elasticity modules, such as aramid fibers, are used to create high performance composites. Here are the main physical-mechanical properties of aramid fibers: high tensile strength, high shock resistance, high stresses and fatigue, excellent characteristics of damping vibrations, exposure characteristics preservation at temperatures ranging from-700C to + 1800C, flame resistance (self-extinguishing, not melting), low smoke emission, corrosion stability, good electrical characteristics, low conductivity and low dielectric constant. The main areas of use of aramid wires are: special clothes resistance to cutting and high temperature components for materials composite, ropes, cables, lashing straps, safety equipment for the armed forces, police, aircraft, etc. This research used Arboform L, V3 Nature reinforced with aramid fiber. The experimental research plan observes the Taguchi methodology with 6 input factors, each with two levels of variation. The input parameters effects are analyzed on the mechanical properties of the specimens obtained. Micro-indentation tests and differential scanning calorimetry were conducted. The studied test samples showed the following mean recovery values: 31.219μm for the first sample, 31.059μm for the second sample and 25.996μm for the third sample. Three extreme points were detected on the DSC thermogram: an endothermic peak occurs up to 380 K (I) and an exothermic one of higher intensity (II); above 430 K the DSC thermogram shows a deviation from linearity of the flow heat, which suggests a melting phenomenon. The first variation of the heat flow can be attributed to the transformations that occur in solid form in the sample subjected to heating, the first adsorption heat exchanger (peak I) and the second heat releasing (peak II). Comparing the amount of heat absorbed by heat dissipation, one may notice that the exothermic conversion is increased. The initial transformation temperature (Ts 10) corresponds to 10% of the total peak area while the final transformation temperature (Tf 90) corresponds to 90% of the total surface area.

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