Properties of Plywood Panels Composed of Thermally Densified and Non-densified Alder and Birch Veneers

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dc.contributor.authorBekhta, Pavlocs
dc.contributor.authorPipíška, Tomášcs
dc.contributor.authorGryc, Vladimírcs
dc.contributor.authorSedliačik, Jáncs
dc.contributor.authorKrál, Pavelcs
dc.contributor.authorRáheĺ, Jozefcs
dc.contributor.authorVaněrek, Jancs
dc.coverage.issue1cs
dc.coverage.volume14cs
dc.date.accessioned2023-03-20T07:54:28Z
dc.date.available2023-03-20T07:54:28Z
dc.date.issued2023-01-04cs
dc.description.abstractUkrainian companies mainly use birch in the manufacture of plywood, but species such as black alder is not yet widely used in the manufacture of plywood due to its lower properties. It is well known that thermal compression is often used to improve the properties of solid wood. Good lay-up schemes of veneer can maximize the advantages, minimize the disadvantages of these wood species, and generally improve the utility value of the plywood. The research aimed to develop plywood panels with two wood species and two types of veneer treatments and to evaluate the influences of different lay-up schemes on the properties of the plywood. Five-layer plywood panels were formed with 16 different lay-up schemes using birch (Betula verrucosa Ehrh.) (B) and black alder (Alnus glutinosa L.) (A) veneers, non-densified (N) and thermally den-sified (D). The different lay-up schemes were to identify opportunities to improve the mechani-cal and physical properties of the plywood by replacing birch veneer in the plywood structure with alternative alder veneer. The veneer sheets were thermally densified in laboratory hot press at temperature 180 °C and pressure 2 MPa within 3 min. The conducted study showed that the bending strength, modulus of elasticity and shear strength of mixed-species plywood (BD–AN–AN–AN–BD) increased up to 31.5%, 34.4% and 16.8%, respectively, in comparison to those properties of alder plywood from non-densified veneer (AN–AN–AN–AN–AN), by positioning al-der non-densified veneers in the core layers and birch densified veneers in the outer layers. Moreover, the surface roughness of plywood panels with outer layers of birch veneer is lower than panels with outer layers of alder veneer. It was shown that non-treated alder veneer, de-spite somewhat lower strength properties than birch veneer, could be successfully used with proper lay-up schemes in the veneer-based products industry.en
dc.formattextcs
dc.format.extent18cs
dc.format.mimetypeapplication/pdfcs
dc.identifier.citationForests. 2023, vol. 14, issue 1, 18 p.en
dc.identifier.doi10.3390/f14010096cs
dc.identifier.issn1999-4907cs
dc.identifier.other182392cs
dc.identifier.urihttp://hdl.handle.net/11012/209210
dc.language.isoencs
dc.publisherMDPIcs
dc.relation.ispartofForestscs
dc.relation.urihttps://www.mdpi.com/1999-4907/14/1/96cs
dc.rightsCreative Commons Attribution 4.0 Internationalcs
dc.rights.accessopenAccesscs
dc.rights.sherpahttp://www.sherpa.ac.uk/romeo/issn/1999-4907/cs
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/cs
dc.subjectbirchen
dc.subjectblack alderen
dc.subjectthermal densificationen
dc.subjectplywood propertiesen
dc.subjectwood veneersen
dc.titleProperties of Plywood Panels Composed of Thermally Densified and Non-densified Alder and Birch Veneersen
dc.type.driverarticleen
dc.type.statusPeer-revieweden
dc.type.versionpublishedVersionen
sync.item.dbidVAV-182392en
sync.item.dbtypeVAVen
sync.item.insts2023.03.20 08:54:28en
sync.item.modts2023.03.20 08:14:44en
thesis.grantorVysoké učení technické v Brně. Fakulta stavební. Ústav technologie stavebních hmot a dílcůcs
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