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# Nordic Pulp & Paper Research Journal

### The international research journal on sustainable utilization of forest bioresources

Editor-in-Chief: Lindström, Tom

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2000-0669
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Volume 33, Issue 3

# An experimental study of the chipping process with focus on energy consumption and chipping angles

Jonas L. Nyström
/ Benny Thörnberg
Published Online: 2018-08-10 | DOI: https://doi.org/10.1515/npprj-2018-3055

## Abstract

A series of chipping experiments were performed under both dynamic and quasi-static conditions in a laboratory wood chipper (dynamic) and in a MTS-servohydraulic testing machine (quasi-static). One aim with the experiments was to investigate the rate dependency of the energy consumption during chipping. Another aim was to try to determine the load per unit knife edge length required to initiate cutting. The experiments were carried out using different combinations of spout and edge angles. It was found that for large edge angles (keeping the spout angle constant at $30°$) there was a slight rate dependency such that the energy consumption was larger at higher cutting rates which is quite in opposite of what is expected if wood is assumed to be a viscoelastic material. It was also found that to determine the force at initiation of cutting, is not a trivial task. Both Acoustic Emission monitoring and visual inspection was used to this end. The wood species used in this study was pine (Pinus silvestris).

## References

• Gradin, P. A., Nyström, S., Flink, P., Forsberg, S., Stollmaier, F. J. (1997) Acoustic Emission Monitoring of Light Weight Coated Paper. J. Pulp Pap. Sci. 23:3.Google Scholar

• Hellström, L. M., Gradin, P. A., Engstrand, P., Gregersen, Ø. (2011a) Properties of wood chips for thermomechanical pulp (TMP) production as function of spout angle. Holzforschung 65:805–809.

• Hellström, L. M., Gradin, P. A., Gulliksson, M., Carlberg, T. (2011b) A Laboratory Wood Chipper for Chipping Under Realistic Conditions. Exp. Mech. 51:1309–1316.

• Hellström, L. M., Carlberg, T., Engstrand, P., Gradin, P. A. (2012) Evaluation of Collimated Chipping Technology for Energy Consumption in Mechanical Pulping. J-FOR 2(3):6–9.Google Scholar

Accepted: 2018-06-27

Published Online: 2018-08-10

Published in Print: 2018-09-25

Conflict of interest: There are no conflicts of interest.

Citation Information: Nordic Pulp & Paper Research Journal, Volume 33, Issue 3, Pages 460–467, ISSN (Online) 2000-0669, ISSN (Print) 0283-2631,

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© 2018 Walter de Gruyter GmbH, Berlin/Boston.