Roll press compaction of corn stover and perennial grasses toincrease bulk density

Nalladurai Kaliyan, R. Vance Morey, David R. Schmidt

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


The objective of this study was to investigate roll press compaction of coarsely ground corn stover and native perennial grasses to produce compacted products with a bulk density of at least 240kgm-3 for effective truck transport. A pilot-scale roll press compaction machine (520.7mm roll diameter and 127.0mm roll width) was used to compress corn stover and perennial grasses (moisture contents of 10% to 18% wet basis) ground in a tub-grinder with three round-hole screen opening sizes (25.4, 76.2, and 127.0mm). Bulk density of compacted materials (i.e., compacts) ranged from 263kgm-3 to 365kgm-3 for the roll compaction forces of 214-534kN. Durability (tumbling test) of compacts ranged from 61% to 92%. Specific energy consumption (excluding no-load machine energy) for the roll press compaction ranged from 19MJMg-1 to 339MJMg-1. The results from this study would be useful for developing a biomass supply logistics system involving coarse-grinding followed by roll press compaction of biomass bales.

Original languageEnglish (US)
Pages (from-to)322-330
Number of pages9
JournalBiomass and Bioenergy
StatePublished - Aug 2013

Bibliographical note

Funding Information:
This research was supported by North Central Sun Grant Biomass Feedstock Logistics Program , and Xcel Energy Renewable Development Fund . A previous version of this article was presented at the 2011 American Society of Agricultural and Biological Engineers (ASABE) Annual International Meeting in Louisville, Kentucky, 2011 Aug 7-10 as ASABE Paper No. 1110564. The authors would like to thank Mr. Troy Scharr (University of Minnesota) and Bepex's personnel (Bepex International LLC, Minneapolis, MN) for their assistance with this study.


  • Biomass logistics
  • Corn stover
  • Densification
  • Perennial grasses
  • Roll press compaction
  • Tub-grinding


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