Comparison of Reaction Wood and Normal Wood of Some Commercial Tree Species Sevinç Kaz, Saim Ateş, Tuba Külçe Drvna Industrija, 2023 This study aims to analyze the reaction wood samples for some industrial tree species naturally grown in Kastamonu province in Turkey and compare them with the relevant standards. Some anatomical, chemical, fiber morphological, optical properties, and color changes before and after drying were analyzed for the reaction wood (RW) samples. While the holocellulose content of fir and pine compression wood (CW) was found to be lesser (~3-4 %), the lignin content was higher than those of the opposite wood (OW) (~34 % for pine and 12 % for fir). On the contrary, the amount of holocellulose was found to be higher (~1-4 %), and the lignin was lower (at about 6-15 %) in the tension wood (TW) samples. It was observed that average lengths are more extended in TW(~50-54 %) and shorter in CW (~13-17 %) than those of OW. Significant differences were observed between the anatomical structures of the coniferous and deciduous species studied. Although, the greatest color differences in wet and oven-dried samples of coniferous trees were measured in CW (~15-17 %), it has been found as about 0.7-3 % in TW for deciduous species. Some differences were observed in the anatomical, optical, fiber morphological, and chemical properties of the RW for the studied wood species. Due to its higher lignin content and better physical properties, CW can be used for producing small households and hand tools, ornaments, toys, etc. It will also be appropriate for use in milling and turning work. It is recommended that, because of the lower lignin content and higher polysaccharide ratio, TW should be primarily used for the cellulose, pulp, and paper industries, where high mechanical resistance values are required. Consequently, RW formation causes some physical, chemical, mechanical, anatomical, and optical differences compared to OW in deciduous and coniferous species.
Evaluation of some plastic wastes as an additive to reinforcing the high density fiberboard (Hdf) Tuba KÜLÇE, Saim Ateş, Çağrı Olgun Drewno, 2021 REINFORCE HIGH-DENSITY FIBERBOARD (HDF)The use of plastic wastes in the forest product industry as an additive material is an alternative solution for reducing environmental pollution.In this study, different types of plastic wastes, polyethylene terephthalate (PET), polypropylene (PP), and polystyrene (PS), which have various characteristics and considerable potential as reinforcing materials for wood fibers, were added to high-density fiberboard (HDF) in different mixture ratios (25/75, 50/50, 75/25) with commercial fibers.Changes in some properties of the boards, including density, water absorption, thickness swelling, modulus of elasticity (MOE), bending strength (MOR), and internal bond strength, were determined.It was found that water absorption and thickness swelling ratios were lower in the boards with plastic waste additive than in the control samples.Moreover, the mechanical properties of the samples using plastic waste (except PET) were nearly as good as those of the control samples.The results indicate that PP and PS wastes can be considered for use in the reinforced HDF production process, with different mixture ratios for different usage areas.
