PAPER making! g! FROM THE PUBLISHERS OF PAPER TECHNOLOGY INTERNATIONAL ® Volume 11, Number 2, 2025
(unscreened, course, fine) using a tumbler screening machine. Rigid insulation panels with a target density of 110 kg m -3 were produced using 5 wt% polymeric diphenylmethane diisocyanate (pMDI) adhesive. Panels made from softwood fibres with a lower bulk density showed a different type of density profile compared to those made from hardwood fibres. The pattern of mean fibre length distribution density (q1) was similar for pine and larch as well as for beech and oak and was reflected in similar compression strength of the WFIP from the corresponding fractions. Water absorption was dependent on the wood species, irrespective of the fibre fraction. The hardwood panels (beech, oak) had a higher thermal conductivity (TC) than the softwood panels (spruce, pine, larch). The coarse fibre panels tended to have a higher TC than the fine fibre panels. Overall, the wood species and screening variants could be used to produce WFIP for indoor use.
Technical Abstracts
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