Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Effect Of Some Productıon Parameters On Vertıcal DensıtyProfıle And Technologıcal Propertıes Of Mdf

In this study, influence of wood species and mixtures ratios, resin content, mat moisture content, continuous press speed, and continuous press pressure on vertical density profile (VDP) and some technological properties of medium density fiberboard (MDF) was investigated. Also effect of VDP on these technological properties of MDF was researched.

For this objective, MDF panels used in this research were produced by using continuous press technologies in Kastamonu Entegre Wood Industry and Trade Inc. MDF Plant is located in Gebze, Kocaeli. VDPs of the MDF panels were measured; density, thickness swelling (2h – 24h) and surface absorption were evaluated for physical properties and modulus of rupture (MOR), modulus of elasticity (MOE), and internal bond (IB) were evaluated for mechanical properties. Zwick Universal Test Machine was used for determining the mechanical properties. VDPs were measured by using GreCon Density Profiler based on a gamma radiation system. After experiments performed according to standards, variations on performance properties of the MDF panels were discussed to find out the relationships between reasons and results. SPSS 11.0 software was used for analyzing of results obtained from all experiments.

Development of a fundamental understanding of the parameters mentioned above will help to optimize the manufacturing process of MDF panels allowing improved products quality, enhanced durability, and increased productivity. According to the analysis results, it was given suggestions to provide MDF and other similar wood composites producers by determining optimum process variations. In addition, it is considered that this study can contribute to scientists will research in this subject.

Results obtained from the study are shown that wood species and mixtures, resin content, mat moisture content, continuous press speed, and press pressure affect vertical density profile and technological properties of MDF panels.

VDP is one of the most important panel property that characterizes the density distribution through the panel thickness of wood-composite panels. MDF producers have effectively used some parameters such as species and their mixture ratios, resin content, press closure rate, mat moisture content (MC), continuous press speed, press pressure to manipulate the VDP to alter product performance.

The formation of the vertical density profile, physical and mechanical properties of the MDF panels were affected by process parameters mentioned above. MOR, MOE, IB, thickness swell (TS), and surface absorption values of MDF were affected by VDP shape, peak density, core density, difference between peak and core density, and the other VDP elements.

Mat moisture content, continuous press speed and pressure are the most effective production parameters on VDP. Physical properties that highly affected by formation of VDP are TS and surface absorption while mechanical properties are MOR, MOE, and IB.

  

SÜİNANÇ Fatma Ömür,

Danışman : Prof.Dr. Turgay AKBULUT

Anabilim Dalı : Orman Endüstri Mühendisliği Ana Bilim Dalı

Programı (Varsa) : Odun Mekaniği ve Teknolojisi

Mezuniyet Yılı : 2007

Tez Savunma Jürisi : Prof.Dr.Turgay AKBULUT (Danışman)

Prof.Dr.Nusret AS

Prof.Dr.Murat TEKER

Doc.Dr.Öner ÜNSAL

Yrd.Doc.Dr.Türker DÜNDAR