Effects of Urea–Formaldehyde Resin Mole Ratio on the Mechanical Properties of High-Density Fiberboards (HDF)

Öz

In this study, 60% yellow pine (Pinus sylvestres L), 20% fir (Abies nordmanniana L), 20% beech (Fagus orientalis L) were used biomass. The production of high-density fiberboards was used (A; 1.17, B; 0.98 and C; 0.88) three different moles urea-formaldehyde resins. HDF boards were produced in the production line. These boards were sized 7.7mmx2100mmx2440mm. Production parameters remained constant in the HDF line process. The only variable were urea formaldehyde resins used in three different molar ratios. The productions were manufactured in pressing speed of 950 mm/sec and pressing temperature 218ºC and 58 seconds pressing time in the continue hot press. The density and mechanical tests of the produced A, B, C HDF boards (bending strength (MOR), modulus of elasticity in bending (MOE) and tensile strength perpendicular to the plane of the plate (IB)) were examined. Five boards were measured from each test group. Density of HDF boards (A; 870.4 kg/m³, B; 875.6 kg/m³, C; 857.4 kg/m³), mechanical test measurement performances, bending strength (MOR) (A; 40.97 N/mm², B; 39.90 N/mm², C; 38.08 N/mm²), modulus of elasticity in bending (MOE) (A; 3814.2 N/mm², B; 3525 N/mm², C; 3356.6 N/mm²), tensile strength (IB) (A; 1.48 N/mm², B; 1.38 N/mm², C; 1.17 N/mm²). As a result of the study (A; 1.17, B; 0.98 and C; 0.88), differences were shown according to the mechanical test results on HDF boards produced using urea-formaldehyde glue. These differences were due to urea formaldehyde glue used in different mole ratios.

Anahtar Kelimeler

• HDF
• Mechanical Properties
• Urea Formaldehyde
• Moles Ratio

Üre-Formaldehit Reçine Mol Oranının Yüksek Yoğunlukta Lif Levhanın (HDF) Mekanik Özellikleri Üzerine Etkileri

Öz

Bu çalışmada, yüksek yoğunlukta lif levha üretim hattında %50 sarı çam (Pinus sylvestres L), %30 köknar (Abies nordmanniana L), %20 kayın (Fagus orientalis L) R;1.17, X;0.98 ve Y; 0.88 mol üre-formaldehit tutkalı (ÜF) kullanılarak 7.7mmx2100mmx2440 mm HDF levha üretilmiştir. Proseste üretim parametreleri sabit kalmıştır. Tek değişken üç farklı mol oranlarında kullanılan üre formaldehit tutkalı olmuştur. Sıcak pres parametrelerinden pres hızını 950 mm/sn ve pres sıcaklığını 215ºC ve 60 saniye presleme süresi parametrelerinde üretim gerçekleşmiştir. Üretilen A, B, C HDF levhaların yoğunluğuna ve mekanik testlerinin (eğilme mukavemetine, eğilmede elastikiyet modülüne ve levha düzlemine dik çekme mukavemeti) performans testlerine bakılmıştır Her bir test grubundan beş levha ölçülmüştür. HDF levhalarının özgül ağırlığı (A; 870.4 kg/m³, B; 875.6 kg/m³. C; 857.4 kg/m³), mekanik test ölçüm performansları, eğilme mukavemeti (A; 40.97 N/mm², B; 39.90 N/mm², C; 38.08 N/mm²), eğilmede elastikiyet modülü (A; 3814.2 N/mm², B; 3525 N/mm², C; 3356.6 N/mm²), çekme mukavemeti (A; 1.48 N/mm², B; 1.38 N/mm², C; 1.17 N/mm²) gerçekleştirilmiştir. Çalışmanın sonucunda (A;1.17, B;0.98 ve C;0.88) üre formaldehit tutkalı kullanarak üretilen HDF levhalarına mekanik test sonuçlarına göre farklılıklar ortaya konulmuştur. Bu farklılıklar sebebi farklı mol oranlarında kullanılan üre formaldehit tutkalından kaynaklanmaktadır.

Anahtar Kelimeler

• HDF,
• Mekanik Özellikler,
• Üre Formaldehit
• Mol Oranı

Kaynakça

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