Journal article

A laboratory wood chipper for chipping under realistic conditions

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Author list: GRADIN P, CARLBERG T, HELLSTRÖM L, HELLSTRÖM L, GRADIN P, Gulliksson M, CARLBERG T

Publication year: 2011

Start page: 1309

End page: 1316

Number of pages: 8

ISSN: 0014-4851

DOI: http://dx.doi.org/10.1007/s11340-010-9452-1

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Abstract

In order to be able to study the damage mechanisms and in general the mechanisms active when a wood chip is created during the wood chipping process, it is crucial to have access to an experimental equipment in which chips can be produced under realistic conditions. In this paper is presented a laboratory chipper, which has been developed to admit chipping at rates that can be varied in a large interval i.e. at rates ranging from zero to 50 m/s. The knife used to cut the chips is mounted in a knife holder, which is instrumented in such a way that forces in three orthogonal directions can be measured. Since the actual force and the measured force differs due to inertia effects, a simple mathematical model is developed and used to evaluate the force acting on the knife. Some results are shown from the force measurements and it is concluded that the laboratory chipper is a versatile tool in the process of increasing the understanding of the chipping process.


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