Kastamonu University Journal of Forestry Faculty

1303-2399 1309-4181

Kastamonu University

10.17475/kastorman.333858

The effects of different variables on the screw withdrawal strength of plywood

Kontrplakta farklı değişkenlerin vida çekme direnci üzerindeki etkisi

Yorur

Huseyin

Tor

Onder

Gunay

Muhammed Nuri

Bırıncı

Emre

09 28 2017

17 2 325 333 08 10 2017 08 21 2017

2001

Kastamonu University Journal of Forestry Faculty

Aimof study: The purpose of this study is to investigate the effect ofthe pilot-hole, screw type, screwing direction, water retention and adhesive onthe screw pull resistance of the plywood.Materialand Methods: Two types of screws, 3.5 mm and 4 mm in diameter, wereused in the study. The supplied 18 mm thick plywood is sized to 50 mm x 50 mmaccording to TS EN 13446 standards. The pilot-holes were drilled so that 80% ofthe screw diameter would be used. After the polyvinyl acetate (PVAc) andpolyurethane (PU) adhesives were injected into the pilot-holes, screwing wascarried out perpendicularly and horizontally to the surface of the sample. Halfof the samples were immersed in water for 2 hours before the screw withdrawaltest. The results of the tests were interpreted by statistical analysis.Mainresults: When examining the results, all of the pilot-hole drilledsamples showed higher screw withdrawal resistance than the pilot-hole drilledsamples. It was also found that the screw withdrawal resistance perpendicularto the surface is higher than that parallel to the surface. When the glueapplied pilot-hole specimens were examined, the PU specimens showed higher screwwithdrawal strength than the PVAc specimens. A lower screw withdrawal strengthwas determined when samples were immersed in water. It was also found that asthe screw diameter increases, the screw withdrawal strength increases.Researchhighlights: In is concluded that applying PU in pilot-holes beforedriving screw in significantly affected screw holding performance in plywood.

ÖzetÇalışmanınamacı: Kontrplağın vida çekme direnci üzerine kılavuz deliğinin,vida tipinin, vidalama yönünün, suda bekletmenin ve yapıştırıcının etkisiniaraştırmaktır.Materyalve Yöntem: Çalışmada çapları sırasıyla 3.5 mm ve 4 mm olmaküzere 2 tip vida kullanılmıştır. Temin edilen 18 mm kalınlığındaki kontrplak TSEN 13446 standardına göre 50 mm x 50 mm boyutlarında ebatlandırılmıştır.Kılavuz deliğinin çapı, testlerde kullanılan vida çapının %80’i olacak şekildedelme işlemi yapıldı. Polivinil asetat (PVAc) ve Poliüretan (PÜ) tutkallarıkılavuz deliklerine enjekte edildikten sonra örnek yüzeyine ve kenarınavidalama işlemi gerçekleştirildi. Örneklerin yarısı 2 saat süre ile sudabekletildikten sonra vida çekme testleri yapıldı. Testlerin sonuçlarıistatistik analiz ile yorumlandı.Sonuçlar: Sonuçlar incelendiğinde kılavuz deliği açılmayan örnekler dahayüksek vida çekme direnci göstermiştir. Ayrıca yüzeyden uygulanan vida çekmedirencinin kenardan uygulanana göre daha yüksek olduğu tespit edilmiştir.Tutkal uygulanan kılavuz delikli örnekler incelendiğinde Poliüretan (PÜ)uygulananların vida çekme mukavemeti Polivinil asetat (PVAc) uygulananlara göredaha yüksek olduğu belirlenmiştir. Suda bekletilmiş örnekler incelendiğindedaha düşük vida çekme mukavemeti göstermiştir. Ayrıca vida çapı arttıkça vidaçekme mukavemetinin arttığı tespit edilmiştir.Araştırmavurguları: Kontrplakta vidalama öncesinde kılavuz deliklerine PÜuygulanması vida tutma performasını önemli ölçüde etkilemektedir.

Screw withdrawal Plywood Pilot-hole Polyvinyl acetate

Vida çekme Kontrplak Kılavuz deliği Polivinil asetat Poliüreta

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