Browsing by Person "Pecenka, Ralf"

Now showing 1 - 3 of 3
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    Cost Reductions in Natural Fibre Processing : Use of an Optimised Comb Shaker for Fibre Cleaning
    (2004) Pecenka, Ralf
    There is a demand for high-grade hemp and flax fibres as a raw mate- rial, not only in the automobile industry. Experience in cultivation and harvesting as well as modern processing facilities are needed for Euro- pean farmers to supply the raw fibre materials. A pilot installation has been developed at the Institute of Agricultural Engineering Bornim with which both retted and unretted hemp, flax and linseed straw can be processed. Cost-effectiveness calculations and processing trials have shown that efficient fibre processing and in particular efficient fi- bre cleaning are necessary in order to achieve an attractive straw price for the farmer.
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    Kostenreduzierung in der Naturfasergewinnung : Einsatz einer optimierten Kammschüttel für die Faserreinigung
    (2004) Pecenka, Ralf
    Hochwertige Hanf- und Flachsfasern sind ein gefragter Rohstoff nicht nur für die Automobilindustrie. Damit die Faserrohstoffe von europäischen Landwirten geliefert werden können, sind Erfahrung im Anbau und Ernte sowie moderne Aufschlussanlagen gefragt. Am Institut für Agrartechnik Bornim wurde eine Pilotanlage entwickelt, mit der so-wohl geröstetes als auch ungeröstetes Hanf-, Flachs-und ?-lleinstrohaufgeschlossen werden können. Wirtschaftlichkeitsrechnungen und Verarbeitungsversuche haben gezeigt, dass ein leistungsfähiger Faseraufschluss und insbesondere eine effiziente Faserreinigung notwendig sind, um dem Landwirt einen attraktiven Strohpreis zahlen zu können.
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    Tube Ensiling of Hemp - Initial Practical Experience
    (2007) Pecenka, Ralf; Idler, Christine; Grundmann, Philipp; Fürll, Christian; Gusovius, Hans-Jörg
    The conventional production of natural fibres from e.g. hemp or flax is based on field drying and retting of fibre straw. Since at the usual harvest time in September, weather conditions are often problematical for harvesting and retting hemp, a weather-independent post-harvest technique was studied. The harvesting of hemp by means of a chopper followed by anaerobic storage is favourable for the farmer because the weather risk can be avoided. Additional steps are the same as those for ensiling of fod- der. As a further advantage of this novel processing tech- nology, the whole plant material will be processed to form final products such as insulation materials and fibre boards, or semi-finished products for injection moulding. At present, a pilot plant with a processing capacity of 1 t per hour hemp silage is being built up and tested. The in- vestigations regarding storage costs and appropriate stor- age technology have shown that both stack silos and film silos are capable of preserving the raw material for more than one year. Initial results of the preservation of hemp in film tubes are presented.