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The expanded perlite (EPA) is a heat and sound absorption, and lightweight material, which ensures economic advantage in building materials. The objective of this study is to evaluate the effect of EPA on thermal conductivity of medium density fiberboard (MDF) panels. The thermal conductivity of panels was measured by a quick thermal conductivity meter according to ASTM C 1113-99 hot-wire method. The lowest thermal conductivity was measured in K, which is produced at using expanded perlite that is ratio 1% on the only surface layer, as 0.1695 Kcal/mh°C. The highest thermal conductivity value was observed in G, which is manufactured at using expanded perlite that is ratio 20% into the both core and surface layer, as 0.1959 kcal/mh°C. It has been proven that the thermal conductivity value was positively affected by using perlite. [ABSTRACT FROM AUTHOR]

The expanded perlite (EPA) is a heat and sound absorption, and lightweight material, which ensures economic advantage in building materials. The objective of this study is to evaluate the effect of EPA on thermal conductivity of medium density fiberboard (MDF) panels. The thermal conductivity of panels was measured by a quick thermal conductivity meter according to ASTM C 1113-99 hot-wire method. The lowest thermal conductivity was measured in K, which is produced at using expanded perlite that is ratio 1% on the only surface layer, as 0.1695 Kcal/mh°C. The highest thermal conductivity value was observed in G, which is manufactured at using expanded perlite that is ratio 20% into the both core and surface layer, as 0.1959 kcal/mh°C. It has been proven that the thermal conductivity value was positively affected by using perlite. [ABSTRACT FROM AUTHOR]

This study evaluated influence of press temperature and press time on scratch and abrasion resistance of particle board panels overlaid by melamine resin impregnated paper. Three-layer experimental particleboard panels were made from mixed particles of beech (Fagus orientalis Lipsky.), poplar (Populus tremula L.), and Scotch pine (Pinus sylvestris L.) with an average density of 0.75 g/cm³. Panels were overlaid by melamine impregnated papers using temperature levels of 170, 185, and 205 °C and press times ranging from 18 to 46 s. Both scratch and abrasion resistance of the specimens were determined employing two different apparatus. Based on the findings of work both properties of the samples increased with increasing press time for each press temperature level. It appears that increasing press temperature from 185 °C to 205 °C did not make any significant difference on scratch and abrasion resistance of the panels that were pressed using various press times at 95% confidence level. It was found that 170 ³C press temperature and 46 s press time resulted in the best characteristics of overlaid samples. It was also determined that effect of melamine resin pick-up ranging from 30% to 60% was an important parameter on both properties of the samples mentioned above. [ABSTRACT FROM AUTHOR]

Particleboard is one of the most important wood-based panel products on the market. The objectives of this study are to investigate the relationship between the density profile and some technological properties of particleboard and to determine the influences of press type, cold and hot press pressures, moisture content of the raw materials on the mechanical properties (modulus of rupture, modulus of elasticity and internal bond strength), physical properties (thickness swelling and density profile), and surface property (surface roughness) of three-layered particleboard composite. Based on the findings of this study, it appears that there exists a relationship between the density profile and technological properties of particleboard. The press type, cold and hot press pressures and moisture content of the raw materials are significantly found to be effective on all of the properties of the panels. [ABSTRACT FROM AUTHOR]

Abstract: The objective of this study was to investigate the effects of moisture content of the mat, amount of resin, wood dust usage, and press time on the physical (thickness swelling) and mechanical (modulus of rupture, modulus of elasticity, and internal bond strength) properties, and surface roughness of particleboard. Average roughness (R a), mean peak-to-valley height (R z ), and maximum roughness (R y ) were used to evaluate quantitatively surface characteristics of the specimens. It was found that statistically (p <0.05) significant difference existed between the values of all properties of the panels. While the wood dust usage of up to 20% improved the surface smoothness, surface roughness was increased with the dust usage above 20%. The moisture content of the mat, dust usage, amount of resin, and press time affected the physical and mechanical properties, and surface roughness of particleboard, significantly. [Copyright &y& Elsevier]

Abstract: This study evaluated current furniture and cabinet industry in Turkey. A survey was used to cover 680 of 2250 companies in the country. Some of the problems of small- and mid-sized furniture and cabinet manufacturers such as procurement of raw material, inventory capacity, reasons of insufficient raw material inventory, production types, marketing problems and their reasons were analyzed based on the response to the survey. Possible suggestions to solve the above problems of the manufacturers were made to understand the mechanics and improve overall quality of the industry. [Copyright &y& Elsevier]

The objective of this study was to determine the effect of mimosa bark usage on the formaldehyde emission, physical and mechanical properties of particleboard. Fifteen panels from black locust (Robinia pseudoacacia L.) wood containing mimosa bark in a core layer at different ratios were manufactured. Three boards without bark addition were produced as control boards. Formaldehyde emission, modulus of rupture, modulus of elasticity, internal bond strength and thickness swelling of the specimens were tested. It was found that panels made from black locust wood had the highest mechanical properties while panels containing mimosa bark had the lowest. Bark usage significantly improved (decreased) the formaldehyde emission and thickness swelling of particleboard. Based on the findings of this study, it appears that mimosa bark can be used in the manufacture of particleboard panels. Bark content was found to be a raw material parameter influencing the properties of the panels. [ABSTRACT FROM AUTHOR]