Natural fi bres | additives feature
research group VTT, which has developed natural fi bre-reinforced materials with high wood content and good mechanical properties, plus Aimplas, the Spanish plastics technology institute. Aimplas is also coordinating the development of a
natural fi bre reinforced bioplastic in a second EU-spon- sored project called Bugworkers, which fi nishes in July. Bacteria fed with sugars derived from wheat straw are used to produce polyhydroxybutyrate (PHB), while cellulose nanofi bres from the same residue are the key to providing the necessary rigidity of the material for the further application in white goods and electronic equipment. Wheat straw, which is an agro-industrial residue, can reduce signifi cantly the manufacturing cost of a biodegradable plastic, says Aimplas. Included in the project is the development of
cellulose whiskers and lignin nanofi bres by superfi cial enzymatic modifi cation methods that are intended to impart antimicrobial, fl ame retardant and self-assem- bly properties. Naturstoff-Technik in Ritterhude, Germany had the role of improving methods for cellulose whisker production and functionalization. Ana Espert Bernia in the Extrusion Department at
Aimplas says that co-rotating twin-screw extrusion has been the technology of choice for the production of the various
bio-based compounds. Work has been carried out by Aimplas at pilot plant level and by BH Industries in Poland at an industrial scale. Planetary multi-screw extrusion was also trialled at Aimplas to minimize the effects of shear on PHB degradation during processing. “Special compounding systems have been also designed within the project,” she says. “This has been carried out by partner
Extruder Experts using their own patented technologies.”
Extruder Experts in Germany supplies
special technology solutions in the fi eld of liquid-liquid or liquid-solid mixing for polymers. It says that its machine solutions “overcome current limitations in twin-screw co-rotating extruders.” General manager Dirk Zimmermann says the
Finland’s VTT has developed natural
fi bre-reinforced materials with high wood
content and good mechani- cal properties
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