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The effect of veneer modification on the bond-line strength in laminated veneer products
Linnaeus University, Sweden.ORCID iD: 0000-0001-8644-4099
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Hållbar Samhällsbyggnad.
Luleå University of Technology, Sweden.
Linnaeus University, Sweden.
2015 (English)In: Pro Ligno, ISSN 1841-4737, E-ISSN 2069-7430, Vol. 11, no 4, p. 43-49Article in journal (Refereed) Published
Abstract [en]

A major problem in the manufacture of three-dimensional laminated veneer products (LVP) is damage due to stretching and/or buckling of the veneer. To reduce or eliminate this problem, veneer densification or adding a strengthening layer to the veneer can be an alternative. To study how veneer modification influences the veneer-to-adhesive bond strength, three methods of modification were studied in relation to an unmodified reference veneer: (1) densified veneer, (2) veneer pre-bonded with paper and hot melt adhesive (HMA), (3) veneer pre-bonded with non-woven polypropylene (NW) fabric glued to the veneer (a) with a urea formaldehyde (UF) adhesive, (b) with a mixture of UF and polyvinyl acetate (PVAc) adhesive, and (c) with a PVAc adhesive. Densification, pre-bonding with paper, and NW with UF/PVAc adhesive mixture resulted in no or only a slight decrease in strength of the bond-line compared to the reference. NW glued with UF or PVAc adhesive showed a considerable reduction in the strength of the bond-line. The climatic cycling had no significant influence on the bond strength.

Place, publisher, year, edition, pages
2015. Vol. 11, no 4, p. 43-49
Keywords [en]
densification, HMA, pre-bonding, PVAc, strengthening, THM processing, UF, wood
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-6920Local ID: 30861OAI: oai:DiVA.org:ri-6920DiVA, id: diva2:964762
Available from: 2016-09-08 Created: 2016-09-08 Last updated: 2019-07-09Bibliographically approved

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http://www.proligno.ro/en/articles/2015/4/Blomqvist_final.pdf

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Blomqvist, Lars

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v. 2.35.8