نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش‌آموخته دکترای تخصصی، گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی و محیط زیست، واحد علوم وتحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

2 گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی، دانشگاه تهران، تهران، ایران

3 استاد، گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی و محیط زیست، واحد علوم وتحقیقات، دانشگاه آزاد اسلامی، تهران، ایران

4 استاد، گروه علوم و صنایع چوب وکاغذ، دانشکده منابع طبیعی، دانشگاه تهران، تهران، ایران

5 استاد 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

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