The Effect of Paraffin Droplet Size and Usage Amount Ratio on Some Properties of High Density Fiberboard (HDF)

Mehmet Erdal Kara

Makale detayları

The Effect of Paraffin Droplet Size and Usage Amount Ratio on Some Properties of High Density Fiberboard (HDF)

Yazarlar:

Mehmet Erdal Kara

Yayıncı:

Bartin University

Ana Başlıklar:

Ahşap Fiziği ve Mekaniği

Dergi:

Bartın Orman Fakültesi Dergisi Vol.27 Issue 1, pp.108-117

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001341425

pISSN:

1302-0943

Anahtar kelimeler:

Özet:

 In this study, the effect of the type and usage rate of paraffin emulsions obtained by ultrasonic homogenization method on some physical, technological and mechanical properties of HDF boards was investigated. For this purpose, experimental boards with a density of 870 kgm³ were produced from 70 eastern beech and 30 larch wood fibers. Urea formaldehyde UF resin with 58 solids content at a ratio of 11 by dry fiber weight was used as adhesive in the production of test boards. As a water repellent, paraffin emulsions with different droplet sizes were added at the rates of 0.75, 1.0 and 1.25 by dry fiber weight. The test specimens were tested according to the tensile strength test TS EN 319, surface strength test TS EN 311, thickness swelling and water absorption tests for 24 hours TS EN 317, surface absorption test TS EN 3821 and free formaldehyde test TS EN 12460-5 standards and compared with the control specimens. From the test results, it was determined that droplet size and usage rate had no significant effect on the tensile strength and surface durability of HDFs, while they had a positive effect on 24 hour thickness increase and water absorption, surface absorption and free formaldehyde values. The best values were obtained in the test samples with low droplet size type B and 1 paraffin emulsion. Accordingly, there was a 13 improvement in 24 hour thickness increase, 23 improvement in 24 hour water absorption values, 27 improvement in surface absorption values and 11 improvement in free formaldehyde values. The reason for this situation was explained as the decrease in the water permeability of the paraffin emulsion whose droplet size decreased with ultrasonic homogenization process. At the end of the research, it was recommended to use new technological systems that have an effect on the dimensional stability of fiberboard.

 In this study, the effect of the type and usage rate of paraffin emulsions obtained by ultrasonic homogenization method on some physical, technological and mechanical properties of HDF boards was investigated. For this purpose, experimental boards with a density of 870 kgm³ were produced from 70 eastern beech and 30 larch wood fibers. Urea formaldehyde UF resin with 58 solids content at a ratio of 11 by dry fiber weight was used as adhesive in the production of test boards. As a water repellent, paraffin emulsions with different droplet sizes were added at the rates of 0.75, 1.0 and 1.25 by dry fiber weight. The test specimens were tested according to the tensile strength test TS EN 319, surface strength test TS EN 311, thickness swelling and water absorption tests for 24 hours TS EN 317, surface absorption test TS EN 3821 and free formaldehyde test TS EN 12460-5 standards and compared with the control specimens. From the test results, it was determined that droplet size and usage rate had no significant effect on the tensile strength and surface durability of HDFs, while they had a positive effect on 24 hour thickness increase and water absorption, surface absorption and free formaldehyde values. The best values were obtained in the test samples with low droplet size type B and 1 paraffin emulsion. Accordingly, there was a 13 improvement in 24 hour thickness increase, 23 improvement in 24 hour water absorption values, 27 improvement in surface absorption values and 11 improvement in free formaldehyde values. The reason for this situation was explained as the decrease in the water permeability of the paraffin emulsion whose droplet size decreased with ultrasonic homogenization process. At the end of the research, it was recommended to use new technological systems that have an effect on the dimensional stability of fiberboard.

 In this study, the effect of the type and usage rate of paraffin emulsions obtained by ultrasonic homogenization method on some physical, technological and mechanical properties of HDF boards was investigated. For this purpose, experimental boards with a density of 870 kgm³ were produced from 70 eastern beech and 30 larch wood fibers. Urea formaldehyde UF resin with 58 solids content at a ratio of 11 by dry fiber weight was used as adhesive in the production of test boards. As a water repellent, paraffin emulsions with different droplet sizes were added at the rates of 0.75, 1.0 and 1.25 by dry fiber weight. The test specimens were tested according to the tensile strength test TS EN 319, surface strength test TS EN 311, thickness swelling and water absorption tests for 24 hours TS EN 317, surface absorption test TS EN 3821 and free formaldehyde test TS EN 12460-5 standards and compared with the control specimens. From the test results, it was determined that droplet size and usage rate had no significant effect on the tensile strength and surface durability of HDFs, while they had a positive effect on 24 hour thickness increase and water absorption, surface absorption and free formaldehyde values. The best values were obtained in the test samples with low droplet size type B and 1 paraffin emulsion. Accordingly, there was a 13 improvement in 24 hour thickness increase, 23 improvement in 24 hour water absorption values, 27 improvement in surface absorption values and 11 improvement in free formaldehyde values. The reason for this situation was explained as the decrease in the water permeability of the paraffin emulsion whose droplet size decreased with ultrasonic homogenization process. At the end of the research, it was recommended to use new technological systems that have an effect on the dimensional stability of fiberboard.

 Bu çalışmada, HDF levhalarının bazı fiziksel, teknolojik ve mekanik özellikleri üzerine ultrasonik homojenizasyon yöntemi ile elde edilen parafin emülsiyonlarının türü ve kullanım oranının etkisi araştırılmıştır. Bu amaçla 70 doğu kayını ve 30 karaçam odunu liflerinden 870 kgm³ yoğunluğunda deney levhaları üretilmiştir. Deney levhalarının üretiminde yapıştırıcı olarak kuru lif ağırlığına göre 11 oranında 58 katı madde miktarına sahip üre formaldehit ÜF reçinesi verilmiştir. Su itici olarak farklı damlacık boyutuna sahip parafin emülsiyonları kuru life oranla 0,75, 1,0 ve 1,25 oranlarında ilave edilmiştir. Elde edilen deney örneklerinin yüzeye dik yönde çekme direnci testi TS EN 319, yüzey sağlamlık testi TS EN 311, 24 saat kalınlığına şişme ve su emme testleri TS EN 317, yüzey absorpsiyon testi TS EN 3821 ve serbest formaldehit testi TS EN 12460-5 standartlarına göre test edilerek kontrol örnekleri ile karşılaştırılmıştır. Test sonuçlarından damlacık boyutu ve kullanım oranının HDFlerin çekme direnci ve yüzey sağlamlık üzerine belirgin bir etkisi görülmezken, 24 saat kalınlık artışı ve su alma, yüzey absorpsiyon ile serbest formaldehit değerleri üzerine olumlu yönde etkisi olduğu tespit edilmiştir. En iyi değerlere düşük damlacık boyutuna sahip B tipi ve 1 parafin emülsiyonu kullanılan test örneklerinde ulaşılmıştır. Buna göre 24 saat kalınlık artışında 13, 24 saat su emme değerlerinde 23, yüzey absorpsiyon değerlerinde 27 ve serbest formaldehit değerlerinde ise 11 iyileşme görülmüştür. Bu durumun nedeni olarak ultrasonik homojenizasyon işlemi ile damlacık boyutu küçülen parafin emülsiyonunun su geçirgenliğinin düşürmesi olarak açıklanmıştır. Araştırma sonunda lif levhanın boyutsal kararlılıkları üzerine etkisi olan yeni teknolojik sistemlerin kullanılması tavsiye edilmiştir.

Makale detayları

The Effect of Paraffin Droplet Size and Usage Amount Ratio on Some Properties of High Density Fiberboard (HDF)

Yazarlar:

Mehmet Erdal Kara

Yayıncı:

Bartin University

Ana Başlıklar:

Ahşap Fiziği ve Mekaniği

Dergi:

Bartın Orman Fakültesi Dergisi Vol.27 Issue 1, pp.108-117

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001341425

pISSN:

1302-0943

HDF

fiberboard

paraffin emulsion

ultrasonic homogenization

mechanical and physical propertiesHDF

lif levha

paraffin emülsiyonu

ultrasonik homojenizasyon

mekanik ve fiziksel özellikler

Sayı

Makale detayları

Yazarlar: Mehmet Erdal Kara

Yayıncı: Bartin University

Ana Başlıklar: Ahşap Fiziği ve Mekaniği

Dergi: Bartın Orman Fakültesi Dergisi Vol.27 Issue 1, pp.108-117

Belge Tipi: Makale

Yayın Tarihi: 4/2025

Belge Dili: Türkçe

Document ID (Org No.): 2001341425

pISSN: 1302-0943

Sayı

Yazarlar:

Mehmet Erdal Kara

Yayıncı:

Bartin University

Ana Başlıklar:

Ahşap Fiziği ve Mekaniği

Dergi:

Bartın Orman Fakültesi Dergisi Vol.27 Issue 1, pp.108-117

Belge Tipi:

Makale

Yayın Tarihi:

4/2025

Belge Dili:

Türkçe

Document ID (Org No.):

2001341425

pISSN:

1302-0943