Journal article

A numerical and experimental study regarding the influence of some process parameters on the damage state in wood chips

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Author list: HELLSTRÖM L, GRADIN P, GRADIN P, HELLSTRÖM L

Publication year: 2013

Start page: 691

End page: 696

Number of pages: 6

ISSN: 0018-3830

DOI: http://dx.doi.org/10.1515/hf-2012-0142

View additional information: View in Web of Science


Abstract

The specific energy consumption during mechanical refining operation can be reduced by choosing the optimal process parameters in the wood chipping process such that a beneficial pretreatment is obtained. In the case of the utilization of a larger knife-edge angle, which is one such process parameter, the energy reduction is presumably due to the increased compressive loading parallel to the wood fibers. In the present article, a chip damage parameter D of spruce is in focus, which is relevant for cracking parallel to the fibers. D is defined and its dependence on the chip length and edge angle of the chipping knife is analyzed numerically by means of finite element analyses (FEA). The cutting force was measured in a pilot wood chipper for a number of knife-edge angles. There is a good correlation between the experimental results and those of FEA.


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