The Effects of Heat Treatment, Wood Species and Adhesive Types on Screw Withdrawal Strength of Laminated Veneer Lumbers

Yıl 2019, Cilt: 19 Sayı: 2, 152 - 163, 30.09.2019

Osman Perçin , Mustafa Altunok

https://doi.org/10.17475/kastorman.625819

Öz

Aim of study: The objective of this study was to evaluate the effects of heat
treatment temperature on the screw withdrawal strength on laminated veneer
lumbers (LVL).

Material and Methods: The LVL samples were prepared in the form of ten layers that 2 mm
thickness from the European oak (Quercus
petreae L.), Oriental beech (Fagus
orientalis L.), scotch pine (Pinus
sylvestris L.) and poplar   (Populus nigra L.) veneers bonded with
two-component polyvinyl acetate (PVAc-D4), melamine formaldehyde (MF) and
polyurethane (PU) adhesives and then heat treatment was applied to the prepared
samples. The test samples were subjected to heat treatment at 185 and 212 °C
for 2h.

Main Results: Consequently, according to wood type, the highest screw withdrawal
strength was determined in Oriental beech, with respect to the adhesive type in
MF adhesive. The screw withdrawal strength of samples was decreased with
increasing treatment temperature. In the interaction of the wood materials,
type of adhesive and treatment temperature, it was the highest in control beech
samples bonded with MF and the lowest in poplar samples bonded with PU which
heat-treated at 212°C. It was also observed that the lowest strength loss due
to the treatment temperature was found in oak samples and in MF adhesive.

Research highlights: Screw withdrawal strengths were directly related to wood type and
density, heat treatment temperature and adhesive type.

Anahtar Kelimeler

Heat Treatment, Screw Withdrawal Strength, Laminated Veneer Lumber, Adhesive

Destekleyen Kurum

TUBITAK

Proje Numarası

TOVAG Project Number: 110O020.

Teşekkür

This study is a portion of the Ph.D thesis prepared by Osman Perçin, Institute of Science and Technology, Gazi University, Ankara, Turkey. This study also, is a portion of the Project that was supported by The Scientific and Technological Research Council of Turkey, (TUBITAK), TOVAG Project Number: 110O020.

Isıl İşlem, Ağaç Türü ve Tutkal Çeşidinin Lamine Edilmiş Tabakalı Malzemelerde Vida Çekme Direncine Etkisi

Öz

Çalışmanın amacı: Bu çalışmanın amacı ısıl işlemin lamine edilmiş tabakalı malzemelerde
vida çekme direncine etkisinin belirlenmesidir.

Materyal ve Yöntem: Test örnekleri, 2 mm kalınlığında meşe (Quercus petreae L.), Doğu kayını (Fagus orientalis L.), sarıçam (Pinus
sylvestris L.) ve kavak (Populus
nigra L.) kaplamalarından, 10 katmanlı olarak, çift bileşenli
polivinilasetat (PVAc-D4), melamin formaldehit (MF) ve poliüretan tutkalları
ile lamine edilerek hazırlanmış ve sonra ısıl işlem uygulanmıştır. Test
örneklerine 185 ve 212 °C’de 2 saat ısıl işlem uygulanmıştır.

Sonuçlar:
Sonuç olarak ağaç türüne göre en yüksek vida çekme direnci Doğu kayınında,
tutkal türüne göre ise MF tutkalında belirlenmiştir. Vida çekme direnci ısıl
işlem sıcaklığının artması ile azalmıştır. Ağaç malzeme, tutkal türü ve ısıl
işlem sıcaklığı etkileşimine göre en yüksek vida çekme direnci MF tutkalı ile
lamine edilen kontrol kayın örneklerde, en düşük ise PU tutkalı ile lamine
edildikten sonra 212 °C’de ısıl işlem uygulanan kavak örneklerde
belirlenmiştir. Ayrıca ısıl işlem uygulamasından kaynaklanan en düşük vida
çekme direci MF tutkalı ile lamine edilen meşe örneklerde tespit edilmiştir.

Araştırma Vurguları: Vida çekme direnci ağaç türü, yoğunluğu, ısıl işlem sıcaklığı ve
tutkal türü ile doğrudan ilişkilidir.

Anahtar Kelimeler

Isıl İşlem, Vida Çekme Direnci, Lamine Edilmiş Tabakalı Malzemele, Tutkal

Proje Numarası

TOVAG Project Number: 110O020.

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