Cutting energy assessment of hemp straw
2016
Kakitis, A., Latvia Univ. of Agriculture, Jelgava (Latvia) | Berzins, R., Latvia Univ. of Agriculture, Jelgava (Latvia) | Berzins, U., Latvia Univ. of Agriculture, Jelgava (Latvia)
In recent years, there has been a growing interest for the use of natural materials in composite applications, where cellulose materials are reinforced in cement matrix. The result is an environmentally friendly low density building material, which gives high tensile and compressive strength and good heat and sound insulation properties. To use hemp fibre and stems for cement reinforcement, it should be cut in the definite length of particles. The shapes of the cutting knives and counter knives were designed. The experimentally obtained values for the mentioned hemp varieties of cutting properties and energy consumption using different cutting methods would be used for hemp cutter mechanism design. As a result of studies new blade as Archimedes spiral form with a number of different sectors was designed and patented. During pilot studies cutting energy change depending on the cutting speed were determined. It was found great decreasing of the cutting energy of hemp stems cutting using new blade. Compared with the smooth blade, one cut energy of hemp stems decreases from 1.7 to 2.4 times depending on stalk diameter.
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