In a challenging waste wood market climate , the targeted and effective processing of used wood is more important than ever , according to leading equipment supplier Komptech . For the past few years Komptech has devoted its efforts to developing machines for this purpose , and so can offer economically efficient solutions .
There ’ s no getting around it for over a year the German waste wood market has been suffering from a drastic oversupply of material , more than processors can quite cope with . Mild winters , longer power station down times , and greatly increased quantities of material from collection and construction waste are some of the factors that have brought about this situation .
For these reasons , effective , targeted processing is more important than ever in order to deal with the volumes while achieving the necessary product quality at acceptable cost , for recycling or fuel use . For some time now Komptech has devoted its attention and resources to the development of waste wood processing machinery .
Whether for recycling or fuel use , quality comes first , according to the supplier .
“ There are some things that need to be considered when processing used wood , because the material can vary widely . This starts with the amount of hazardous material contamination , which is classified in waste wood categories AI to AIV and the special PCB category ,” Komptech said . “ The origin of the wood is just as important for the various processing steps . Whether from bulk waste , packaging or demolition , the wood is typically delivered unsorted and more or less heavily contaminated with foreign objects and contraries . These include metallic contraries , as well as plastic and many other materials .
“ Material reclamation , i . e . recycling , takes pride of place over thermal reclamation , i . e . use as fuel . Particle board manufacture is a typical application where reclaimed waste wood is increasingly replacing new wood .
“ But regardless of the intended use , the quality of the reclaimed material is always the first priority . It must have minimal contaminants and fines , and be as homogeneous as possible with a defined composition .”
Low-speed advantages Komptech has examined different processing methods very thoroughly with regard to product yield and operating costs . Testing of high and low-speed shredders measured throughput , energy consumption and granular size composition , the latter by screening .
To evaluate operating costs , tests compared single-stage processing with high and lowspeed shredders , and two-stage processing with low-speed shredder and screener to return overlengths for reshredding .
Testing was performed on three different system scales . For systems running up to 15,000 t annually , single or two-stage processing had the same operating costs , while at up to 30,000 t or 50,000 t annual throughput the two-stage configuration with screener for overlength return was the more economical solution .
Naturally , in this context the
The new Multistar One makes treatment of waste wood and biomass even more efficient . It sends overlengths back to the shredder while screening out the useful fraction
A low-speed shredder like the Crambo not only delivers the best performance for waste wood processing , it is also least sensitive to contraries
insensitivity of low-speed machines like the Crambo and Terminator to metallic contraries is very important , especially in contrast to high-speed chippers like the Axtor , which despite its free-swinging blades is still liable to more wear or damage over long term .
The most economical variant : Crambo and Multistar One Waste wood processing is most effective with the new Multistar One star screen downstream of a Crambo or Terminator shredder . The Multistar One separates out a defined useful fraction while returning overlengths to the shredder .
With a feed hopper for precise material transfer to the generously dimensioned screen deck , a discharge conveyor with 4 m discharge height and a return conveyor that can pivot through 220 °, the One provides a throughput of up to 200 m3 / h .
The current for the electric motors can come either directly from the grid or from a combination of additional hydraulic pump on the shredder and hydraulic generator on the Multistar One . With its compact crane lift frame and variable conveyors for flexible setup plus electric drive , this new Komptech star screen is a very economical machine .
SHREDDING AND CHIPPING MADE EASY .
Axtor 6010
Universal wood shredder
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International Forest Industries | APRIL / MAY 2017 53