Sertleştiricinin orta yoğunluklu lif levhanın bazı fiziksel ve mekanik özelliklerine etkisi

Öz

Sertleştirici olarak Amonyum Klorür (NH4CI)’ün orta yoğunluklu lif levhanın kalınlığına şişme, su alma, vida tutma direnci, Janka sertlik değeri, eğilme direnci, eğilmede elastikiyet modülü ve çekme direnci özelliklerine etkisi değerlendirilmiştir. Sertleştirici kullanılan (kuru life oranla %10 solüsyon olarak 0.75 kg/m³ katı) ve sertleştirici kullanılmayan (kontrol grubu) fabrika üretimi 18mm orta yoğunluklu lif levhaların hedef yoğunlukları, sırası ile 712 ve 715 kg/m³’tür. Toplam olarak 400 örnek test edilmiştir. Sertleştirici kullanılmayan levhalar, vida tutma direnci hariç, daha iyi mekanik özellikler sergilemiştir. Sertleştirici kullanımı ile vida tutma direnci yaklaşık %9.2 iyileştirilmiştir. Fakat sertleştirici kullanımı, elastikiyet modülü, eğilme direnci, çekme direnci ve Janka sertlik değerlerinde sırası ile yaklaşık %8.4, %7.3, %3.6 ve %1.3 düşüşe neden olmuştur. Şaşırtıcı şekilde, suya daldırma süresi kalınlığına şişme ve su almada zıt sonuçlara sebep olmuştur. Kısa süreli suya daldırmada (2 saat) sertleştirici kullanılan levhaların kalınlığına şişme ve su alma değerleri sırasıyla yaklaşık %40.3 ve %29.6 azalmış iken uzun süreli (24 saat) suya daldırmada kayda değer (sırasıyla yaklaşık %62.4 ve %20) artışlar gözlenmiştir. İstatistiksel analizler, değerlendirilen tüm özelliklerde istatistiksel olarak anlamlı (P<0.05) farklılıklar olduğunu ortaya koymuştur.     

Anahtar Kelimeler

• Orta yoğunluklu lif levha
• Meşe
• Sertleştirici
• Fiziksel ve mekanik özellikler

Influences of hardening agent on some physical and mechanical properties of medium-density fiberboard

Öz

Effects of Ammonium chloride (NH4CI) as a hardening agent on thickness swelling (TS), water absorption (WA), screw holding resistance (SHR), Janka hardness, modulus of rupture (MOR), modulus of elasticity (MOE), and internal bonding (IB) properties of medium-density fiberboard (MDF) were evaluated. Target densities were 712 and 715 kg/m³ for hardener applied (0.75 kg/m³ solid as 10% solution (fiber dry wt.)) and unmodified factory made 18 mm thick MDF, respectively. A total of 400 samples were tested. Boards produced without hardener presented better mechanical properties except for SHR. Indeed, SHR was around 9.2% improved by hardener utilization. However, hardener utilization caused around 8.4%, 7.3%, 3.6%, and 1.3% decreases for MOE, MOR, IB, and Janka hardness, respectively. Surprisingly, soaking time caused opposite results for TS and WA. The TS and WA of the hardener utilized MDF decreased around 40.3% and 29.6% for short-term soaking (2h) but remarkable increases (around 62.4% and 20%, respectively) were observed for long-term (24h) soaking. Statistical analysis proved that there were statistically significant (P<0.05) differences between all the evaluated properties.

Anahtar Kelimeler

• Medium density fiberboard
• Oak
• Hardener
• Physical and mechanical properties

Teşekkür

The authors would like to thank Divapan Entegre and its’ General Manager for board production and performing tests.

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