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بررسی امکان ساخت تخته تراشه جهتدار (OSB) از چوب ممرز | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 120، دوره 34، شماره 1 - شماره پیاپی 66، اردیبهشت 1398، صفحه 140-156 اصل مقاله (627.77 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2019.125254.1523 | ||
| نویسندگان | ||
| عباس تمجیدی1؛ محمد مهدی فائزی پور* 2؛ حبیب اله خادمی اسلام3؛ قنبر ابراهیمی4؛ کاظم دوست حسینی5 | ||
| 1دانشآموخته دکترای تخصصی، گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی و محیط زیست، واحد علوم وتحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| 2گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی، دانشگاه تهران، تهران، ایران | ||
| 3استاد، گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی و محیط زیست، واحد علوم وتحقیقات، دانشگاه آزاد اسلامی، تهران، ایران | ||
| 4استاد، گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی، دانشگاه تهران، تهران، ایران | ||
| 5استاد گروه علوم و صنایع چوب و کاغذ دانشکده منابع طبیعی دانشگاه تهران | ||
| چکیده | ||
| DOR:98.1000/1735-0913.1398.34.140.66.1.9.1586 در این تحقیق امکان ساخت تخته تراشه جهتدار سه لایه از چوب گونه ممرز (Carpinus betulus L.) مورد ارزیابی قرار گرفت. برای این منظور تختههای آزمایشگاهی به ضخامت 12 میلیمتر از چوب ممرز، در حالی که جهت تراشههای لایه سطحی در جهت طول تخته و جهت تراشههای لایه میانی عمود بر لایه سطحی بود، با استفاده از دو سطح زمان پرس 6 و 8 دقیقه و سه سطح حرارت پرس180، 200 و220 درجه سانتیگراد ساخته شدند. در کلیه تیمارها، دانسیته تختهها 7/0 گرم بر سانتیمتر مکعب، رطوبت کیک 7 درصد و نوع چسب مصرفی فنل فرمالدئید به میزان 7 درصد وزن خشک چوب بود. خواص مکانیکی و فیزیکی تختههای آزمونی بر پایۀ استاندارد اروپایی (EN 300) جهت تولید تخته تراشه جهتدار مورد ارزیابی قرار گرفت. نتایج حاصل نشان داد که افزایش زمان پرس اثر معنیداری بر چسبندگی داخلی و همچنین اثر بسیار معنیداری بر واکشیدگی ضخامت 24 ساعت تختهها داشت. افزایش حرارت پرس نیز اثر معنیداری بر مدول گسیختگی و همچنین اثر بسیار معنیداری بر چسبندگی داخلی و واکشیدگی ضخامت 24 ساعت تختهها داشت. بهطوریکه در مجموع بیشترین مقادیر مدول گسیختگی و چسبندگی داخلی و همچنین کمترین واکشیدگی ضخامت 24 ساعت در زمان پرس 8 دقیقه و حرارت پرس 220 درجه سانتیگراد بهدست آمد و در این حالت تمامی خصوصیات تختههای تولیدشده بیشتر از حد استاندارد مورد نیاز بود. | ||
| کلیدواژهها | ||
| تخته تراشه جهتدار (OSB)؛ ممرز؛ زمان پرس؛ حرارت پرس؛ فنل فرمالدئید | ||
| عنوان مقاله [English] | ||
| Investigation on the possibility of oriented strand board (OSB) production from hornbeam wood | ||
| نویسندگان [English] | ||
| Abbas Tamjidi1؛ Mohamad Mehdi Faezipour2؛ Habibollah Khademi Eslam3؛ Ghanbar Ebrahimi4؛ Kazem DoosthoseinI5 | ||
| 1Ph.D. Graduate, Department of Wood and Paper Science, College of Natural Resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran | ||
| 2Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Tehran, Iran, | ||
| 3Department of wood and paper science and technology, College of Agriculture and natural resources, Science and research Branch, Islamic Azad University, Tehran - Iran. | ||
| 4Professor, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Tehran, Iran | ||
| 5Professor, Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Tehran, Tehran, Iran | ||
| چکیده [English] | ||
| DOR:98.1000/1735-0913.1398.34.140.66.1.9.1586 In this study, the possibility of three-layered oriented strand board production from hornbeam (Carpinus betulus L.) wood was evaluated. Two levels of press time (6 and 8 minutes) and three levels of press temperature (180˚C, 200˚C and 220˚C) were applied and 12 mm thick laboratory boards were made from hornbeam wood. The strands on the surface layers were aligned in the long direction of the board and the middle layer strands are cross aligned to the surface layers. In all treatments, board targeted density of 0/7 g/cm3 and mat moisture content of 7% and phenol-formaldehyde resin (PF) content of 7% based on the oven dry weight of the strands were kept constant. The mechanical and physical properties of the boards were measured as defined in relevant European standards test methods EN 300. The internal bound (IB) and thickness swelling (TS24) of boards were significantly improved as the press time increased from 6 to 8 minutes. The modulus of rupture (MOR) and internal bound (IB) and thickness swelling (TS24) were significantly improved as the press temperature increased from 180˚C to 220˚C. Overall results showed that the highest MOR and IB and the lowest TS24 were achieved at 8 minutes press time and 220˚C press temperature and all boards made from this mentioned conditions exceed the EN 300 standards for MOR, MOE, IB and TS24. | ||
| کلیدواژهها [English] | ||
| oriented strand board (OSB), hornbeam, press time, press temperature, phenol-formaldehyde | ||
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