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Wood waste, which constitutes an important component of solid waste, is produced by the wood industry, and especially in the processing one. The wood industry includes tree bark, sawdust, planer shavings, sander dust etc. produces unwanted products and/or wastes. This study investigated the usability of sawdust of fruit trees in the production of Medium Density Fiberboard (MDF) and some technological properties of the produced MDF panels. Sawdust of fruit trees was mixed to beech fibers at the ratio of 10, 20 and 30% by weight. The mats were manually formed using 13% urea formaldehyde and pressed at a temperature of 185°C for 8 min in a computer control press. The MDF panel samples of water absorption (WA), thickness swelling (TS), surface hardness, surface roughness, MOR and MOE were investigated. It was determined that the values of WA and TS decreased with increasing the ratio of sawdust. Modulus of rupture (MOR), modulus of elasticity (MOE), surface hardness, surface roughness parameters (Ra, Rq and Rz) values of panel samples increased with increasing the ratio of sawdust from panels. Based on these results, it is advisable that wood sawdust fruit-trees can be used as an alternative raw material source in MDF production. [ABSTRACT FROM AUTHOR]

The veneering process significantly affects the roughness of the furniture elements. The article investigates the effect of the veneering mode on the roughness of cherry (Prunus avium L.) veneered wood medium-density fiber boards (MDF). Different veneering regimes were carried out with controllable variation of the mode factors temperature and pressing pressure. For this purpose, a two-factor experiment was performed with a change in temperature of pressing from 80 to 200°C and pressure from 0.07 to 0.19MPa. Before venneering process, the veneered surfaces are sanded with P150 sandpaper. The values of basic roughness parameters were measured after each technological treatment, in the same evaluation lengths. Based on the results, graphical dependences between the roughness of the veneered boards and the basic mode parameters are presented. The press pressure does not significantly affect the roughness of the veneer. The combination of high temperature and high press pressure reduced initial surface roughness by 16%. [ABSTRACT FROM AUTHOR]

This paper presents a study on the accuracy of the width of the groove channel depending on the magnitude of the mechanical vibrations. Wood-based parts, used in furniture production like plywood and medium-density fiberboard (MDF) were milled. The details are machined on a universal milling machine with bottom location of the working shaft model FD-3. The rotation frequency used for the experiments was 6000min-1 . During the research, attention is paid to some technological factors such as the feed speed of the processed material which is from 2m.min-1 to 10m.min-1, as well as milling area which ranges is from 48mm2 to 144mm2 . Measurements of the accuracy of the groove channel are made with an electronic caliper at a minimum of three points along its length. The investigation results can be used as a base for making some recommendations for the selection of technological factors. [ABSTRACT FROM AUTHOR]

In this study, effects of Zeolite on some properties of medium density fiberboards (MDF) were investigated. Control and Zeolite modified (1.5%, 10kg/m³)) MDF boards were manufactured in Kastamonu Entegre Factory. Mixture of the beech (40%), oak (30%), and Scots pine (30%) wood chips was used for fiber production. Boards with dimensions of 500x490x14mm were manufactured. Thickness, density, moisture content, thickness swelling, water absorption, and formaldehyde gas emissions were determined after the acclimatization process at 20±2°C and 65±5% relative humidity. IB700 laboratory testing machine was used for performing tests. According to results, Zeolite significantly decreased (50.3%) the Formaldehyde emission and increased the water absorbtion with about 84.4% and thickness swelling with about 15.3%, and moisture content with about 8.2% of the MDF panles. Statistical analyses show that Zeolit had no significant influence on the density (0.4% increase) (P: 0.15) and thickness (0.5% decrease) (P: 0.25). Zeolit could be used as additive to decrease formaldehyde emission. [ABSTRACT FROM AUTHOR]

Elastic constants of MDF core and face layers were assessed by compression tests under constant humidity conditions (21°C and % 65 RH). Three Young's modulus, three shear modulus and six Poisson ratios were determined. Whole MDF panels (1880x3660mm) were strip to face and core layers using table saw. The cores and faces were glued together in order to achieve homogenous material properties. 20x20x60mm samples were cut in principal and 45° directions order to evaluate elastic constants of the layers. Compression tests were conducted using a biaxial extensometer to gather stress-strain data. Most of the elastic constants of face and core layers are significantly different. The Young's modulus in perpendicular directions for both layers is inferior to those of parallel directions. The shear values of face layers are significantly higher than those of core layers. Some of the Poisson' ratios are similar. The data presented in the study can be used in advanced modeling of MDF panels where high accuracy is required. [ABSTRACT FROM AUTHOR]

One of the essential shortcomings in the production of MDF is the existence of formaldehyde emissions from boards. This could be overcome by replacement of the currently used synthetic binders. Lignin is a natural binder in wood. Globally, at laboratory level, there are numerous studies on the use of enzyme lignin as a binder for MDF. In these studies were observed some significant shortcomings that could be overcome with the use of lignosulfonates. In this article is presented a study on the influence of the content of lignosulfonate in the composition of MDF made from hardwood tree species on their physical properties. The boards were produced with only 5% content of urea-formaldehyde resin and alteration in the content of calcium lignosulfonate from 0 to 20%. The approximating functions for the influence of the content of lignosulfonate on physical properties of MDF were derived. On that base is made analysis with proper conclusions and recommendation for optimal content of calcium lignosulfonate in the composition of fiberboard. [ABSTRACT FROM AUTHOR]

The study investigates coupling agent effect on some properties of thermoplastic composites filled with sand dust from medium density fiberboard (MDF). The physical, mechanical and morphological properties of the composites produced with the extrusion method were accomplished by using sand dusts of medium density fiberboard (SD_MDF) as lignocellulosic material, high density polyethylene (HDPE) and polypropylene (PP) as thermoplastic polymer and maleic anhydride grafted HDPE and maleic anhydride grafted PP as coupling agents. Coupling agents at different ratios were used to improve the adhesion between fiber and polymers in production, and their effects on the properties were evaluated. Thickness swelling and water absorption of the samples decreased when used coupling agent. Except for impact strength, flexural and tensile properties of the composites which increased with presence of a coupling agent. In the light of obtained results, it was specified that use of coupling agent improved physical, mechanical and morphological properties of SD_MDF filled thermoplastic composites. In addition, optimum coupling agent usage rate were determined as 3%. [ABSTRACT FROM AUTHOR]

The objective of this study was to evaluate the effect of ash (Fraxinus excelsior L.) sawdust on the some properties of Medium Density Fiberboard (MDF). The MDF panels were manufactured from pine fibers and ash sawdusts at the different ratios (10%, 15%, and 20%). Some properties of MDF panels such as surface roughness parameters (Ra, Rz), colour change (πE*), water absorption (WA), thickness swelling (TS) were determined depending on the ratio of ash sawdust. As a result, it was found that the surface roughness parameters and colour change values increased with increasing the ratio of sawdust, the highest surface roughness and colour change values were obtained from the panel type C. However, the water absorption and thickness swelling values decreased with increasing the ratio of sawdust. The lowest values were obtained from the panel type C. [ABSTRACT FROM AUTHOR]

In this study, some properties of Medium Density Fiberboard (MDF) panels manufactured from the coloured fibers with various dyes were investigated. The effects of these dyes on the colour change, surface roughness parameters, water absorption and thickness swelling of the MDF panels were evaluated. The results showed that while the highest total colour change value was obtained with the MDF samples manufactured from the coloured fibers using methylene blue, the lowest total colour change value was recorded with the MDF samples manufactured from the coloured fibers using indigo carmine. The surface roughness values of the coloured MDF samples were found lower than that of the control MDF sample. The water absortion (WA) and thickness swelling (TS) increased in the coloured MDF samples. It was found that, all values changed depending on the type of dyes. [ABSTRACT FROM AUTHOR]

Wood based panel such as medium density fibreboards (MDF) are extensively used in the furniture industry. The most common machining process used for joining is drilling. In order to achieve a good surface quality and minimize the delamination, two of the main parameters must be taken into consideration while drilling: the tip angle of the drill bit and the feed speed. The objective of this study is to analyze the influence of the tip angle of the drill bit and the feed speed on the processing quality evaluated by the size of delaminations at the entrance side and the exit side of the drill bit for two types of drills: flat and twist (helical) drills. To assess the defect, a non-dimensional parameter was used: the delamination factor. The results showed that, in general, the combination of small tip angle with low feed rate minimizes the delamination at drilling. [ABSTRACT FROM AUTHOR]

The objective of this study was to investigate the effect of the panel type, connector type, and anchorage location on load bearing capacity and stiffness of four-sided furniture cases. Real size (1/1 scale) four sided case specimens were constructed of three different wood based panel. Corner joints of four sided cases were connected with two different ready to assemble (RTA) joint techniques including trapez and minifix fasteners. Four sided cases were anchored to the wall from side panels and top panel with L-shape metal connectors. Loading procedures of American National Standards Institute/Kitchen Cabinet Manufacturers Association were followed during the static tests. Loads were applied from top panel's surface with a loading strap. According to results, four-sided cases constructed of 18mm MDF showed higher load carrying capacity and stiffness values than those of 16mm MDF and 18mm PB cases. The cases assembled with trapez connectors yielded higher load carrying capacity and stiffness values than the cases assembled with minifix connectors. Based on the results, it can be concluded that in general, a four-sided case anchored on side panels has a significantly higher load carrying capacity than the one anchored on top panel. [ABSTRACT FROM AUTHOR]