Properties of Oat and Barley Hulls and Suitability for Food Packaging Materials
Kärkönen, Anna; Korpinen, Risto; Järvenpää, Eila; Aalto, Angela; Saranpää, Pekka (2022)
Kärkönen, Anna
Korpinen, Risto
Järvenpää, Eila
Aalto, Angela
Saranpää, Pekka
Julkaisusarja
Journal of Natural Fibers
Sivut
1-11
Informa UK Limited
2022
Julkaisun pysyvä osoite on
http://urn.fi/URN:NBN:fi-fe2022072551975
http://urn.fi/URN:NBN:fi-fe2022072551975
Tiivistelmä
The fiber length, chemical composition, and mycototoxins of oat and barley
hulls were analyzed in order to study the suitability to utilize hulls for paper
and paperboard manufacturing. Oat fibers were observed to be slightly longer
than those of barley (0.80 ± 0.19 mm and 0.51 ± 0.17 mm, respectively). There
were no differences in the composition of the hemicellulose sugars, with the
predominance of xylose and glucose. The amount of Klason lignin in oat and
barley hulls was at almost the same level (23% and 25% of dry weight,
respectively). Guaiacyl (G) units derived from coniferyl alcohol dominated as
shown by pyrolysis-GC-MS. To achieve fibrillation beneficial for the papermaking,
oat and barley hulls were refined with a disc refiner. Oat hulls were
observed to be harder than barley hulls. This affected both calendering and
the appearance of the sheets produced. Laboratory sheets were prepared in
a sheet-former with different percentage of softwood pulp and oat and barley
hulls. Hull-containing paper mostly met the same quality requirements as the
commercial paper except for the burst strength in sheets containing either
species’ hulls, and the tensile strength in sheets containing barley hulls.
hulls were analyzed in order to study the suitability to utilize hulls for paper
and paperboard manufacturing. Oat fibers were observed to be slightly longer
than those of barley (0.80 ± 0.19 mm and 0.51 ± 0.17 mm, respectively). There
were no differences in the composition of the hemicellulose sugars, with the
predominance of xylose and glucose. The amount of Klason lignin in oat and
barley hulls was at almost the same level (23% and 25% of dry weight,
respectively). Guaiacyl (G) units derived from coniferyl alcohol dominated as
shown by pyrolysis-GC-MS. To achieve fibrillation beneficial for the papermaking,
oat and barley hulls were refined with a disc refiner. Oat hulls were
observed to be harder than barley hulls. This affected both calendering and
the appearance of the sheets produced. Laboratory sheets were prepared in
a sheet-former with different percentage of softwood pulp and oat and barley
hulls. Hull-containing paper mostly met the same quality requirements as the
commercial paper except for the burst strength in sheets containing either
species’ hulls, and the tensile strength in sheets containing barley hulls.
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