On the penetrability of various glues in chips from pine sapwood and heartwood

ISSN
0018-3768
Date Issued
2001
Author(s)
Hameed, M.
DOI
10.1007/s001070050456
Abstract
Investigation of the penetrability of various glues [urea-formaldehyde resin (UF-resin), phenol-formaldehyde resin (PF-resin), melamine-urea-phenol-formaldehyd made of pine sapwood and heartwood revealed: the various glues penetrate chips from pine sapwood regardless of tree age, height of the sample studied and surface structure deeper than in those made of heartwood. The various glues more deeply penetrate chips from sapwood and heartwood of the 48-year-old pine than chips from sapwood and heartwood of the 124-year-old pine. The penetrability of various glues in chips from sapwood and heartwood of the 124-year-old pine increases with increasing height of the sample studied. Moreover, glues penetrate sanded surfaces of chips from sapwood and heartwood of the 48- und the 124-year-old pine to a lesser extent than unsanded chip surfaces.