Abstract
The aim of this study is to determine the effects of density and melamine rate on thickness swelling, moisture resistance, modulus of elasticity in bending, bending strength and tensile strength of Oriented Strand Board. For this purpose, Oriented Strand Board panels were produced at three different density (550 - 570 - 590 kg.m-3 in size of 2440 x 1220 x 11 mm) and at five different mixture ratio of melamine in urea formaldehyde resin (0% - 2.5% - 5% - 15% - 20%). Urea formaldehyde and melamine urea formaldehyde included 65% solid content was used of 9.5% ratio relatively dry wood chip weight. At the process of Oriented Strand Board panels, Black pine (Pinus nigra), Scots pine (Pinus sylvestris) and Fir wood (Abies nordmanniana) chips were used at a rate of 80%, 15%, and 5%, respectively. Obtained results show that a linear correlation between the value of horizontal bending resistance, modulus of elasticity with panel density and melamine amount. It was understood that the values of longitudinal bending resistance did not show a direct increasing or decreasing in melamine amount and value of density. As it is seen that the values of longitudinal modulus of elasticity increases in proportion with the increase in the density. In perpendicular tensile strength to the surface; it is seen that values of all glue groups and density values which are intended by the standard for density values are covered. As melamine reinforcement ratio increases, average values of free formaldehyde decrease. It was determined that there was no direct correlation between the value of thickness swelling and panel density, and it had a correlation with used glue type.
Highlights
Oriented Strand Board (OSB) is a material in the form of a board that is produced by pressing the draft obtained within the strands which are specially prepared and mixed with suitable glue and oriented in the desired direction under temperature and pressure during laying (Akbulut et al 2002)
It was determined that there was no direct correlation between the value of thickness swelling and panel density, and it had a correlation with used glue type
While urea formaldehyde (UF) glue is used in the strand board industry in general; phenol formaldehyde (PF), melamine urea formaldehyde (MUF), melamine urea phenol formaldehyde (MUPF) or methylene diisocyanate (MDI) glues are used in the OSB industry (Irle and Barbu 2010, Mendes et al 2013)
Summary
Oriented Strand Board (OSB) is a material in the form of a board that is produced by pressing the draft obtained within the strands which are specially prepared and mixed with suitable glue and oriented in the desired direction under temperature and pressure during laying (Akbulut et al 2002). The most important difference of OSB from known strand boards is larger and specially shaped strands (generally 15-25 mm in width, 75-150 mm in length 0,3-0,7 mm in thickness) to be used in process, to be mixed with different glue and protective chemicals in a different boiler, and pressed and laid in a direction oriented to certain directions (Irle and Barbu 2010).
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
