Tag Archives: hemp

130-140 C. Lühr, R. Pecenka and H.-J. Gusovius
Production of high quality hemp shives with a new cleaning system
Abstract |

Production of high quality hemp shives with a new cleaning system

C. Lühr*, R. Pecenka and H.-J. Gusovius

Leibniz Institute for Agricultural Engineering Potsdam-Bornim (ATB), Max- Eyth-Allee 100, 14469 Potsdam, Germany; *Correspondence: cluehr@atb-potsdam.de

Abstract:

A shortage as well as a rise in costs for raw materials as used for production of derived timber products and fibre composites can be observed for quite some time. Especially the use of wood as energy source has led to an increased demand for cellulose raw materials. Non wood resources e.g. from agricultural production are coming into consideration as alternatives or as replenishment to conventional raw material stock. Therefore, there is an increasing demand for high-grade hemp and flax fibres as a raw material e.g. for production of natural fibre reinforced composites. Within this context also the non-fibrous fraction of fibre plants – shives or hurds – are suitable for different applications in composite or fibre board industry. At present, approx. 50% of the income of a hemp fibre processor is generated by marketing quality shives. There is still a substantial need for efficient shive processing and cleaning technologies. Cleaned high quality hemp shives can be used not only for animal bedding, but also for particle board or composite production. Hence, ATB has developed a simple but efficient technology for cleaning of shive-fibre mixtures. It allows classification and cleaning of shives as well as recovering of short fibres in only one processing step. On basis of these results, the developed fractionating system has been patented and scaled up to an industrial system in cooperation with a machine supplier for hemp processing equipment. The machine has been successfully tested with different machine settings as well as different varieties of input material.

Key words:

, , , ,




215-220 M. Tutt, T. Kikas and J. Olt
Influence of harvesting time on biochemical composition and glucose yield from hemp
Abstract |
Full text PDF (288 kB)

Influence of harvesting time on biochemical composition and glucose yield from hemp

M. Tutt*, T. Kikas and J. Olt

Institute of Technology, Estonian University of Life Sciences, 56 Kreutzwaldi, EE51014, Tartu, Estonia;
*Correspondence: marti.tutt@emu.ee

Abstract:

Abstract. This article investigates the influence of different harvesting times of hemp samples on their biochemical composition and glucose conversion  yield. Samples  were harvested from experimental fields of the Estonian University of Life Sciences from July to September in 2011. Dilute  sulfuric  acid  solution  was  used  for  pretreatment  in  combination  with  enzymatic hydrolysis.  Results  indicate  that  the  highest  glucose  conversion  rate  of  204.1 g kg-1  of  dry matter of biomass was achieved by samples harvested on the 18th of August. The lowest glucose yield  of  170.3 g kg-1  was  achieved  by  samples  harvested  on  25th  of  August,  which  also  had  a very  low  hydrolysis  efficiency  of  46.9%.  Biochemical  composition  and  glucose  conversion efficiencies of samples vary in time. Samples harvested in September have higher cellulose and lignin  content  than  samples  harvested  in  July.  However,  glucose  conversion  efficiencies decrease significantly in later samples. Average hydrolysis efficiency was 51.4%.  

Key words:

, , ,