امکان‌سنجی ساخت صندلی از الوار لایه‌ای چند‌سازة نخل خرمای اصلاح شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه علوم و صنایع چوب و کاغذ، دانشکدة منابع طبیعی، دانشگاه زابل، زابل، ایران.

2 گروه صنایع چوب و کاغذ دانشگاه تهران

10.22059/jfwp.2025.390591.1339

چکیده

نخل خرما در ایران جزء منابع مواد لیگنوسلولزی محسوب می‌شود. در پژوهش حاضر، برای امکان­سنجی و ساخت صندلی نوآورانه با الوار لایه ­ای چند‌سازه از نخل خرما استفاده شد. تنه ­های نخل مطابق استاندارد (24294ISO-) قطع‌زنی و با ارة نواری به چهار تراش و سپس به لایه ­های با ضخامت 3/5 میلی‌متری تبدیل شد. لایه ­ها به‌مدت 2 ساعت در دمای 160 درجة سانتی‌گراد با زمان و دمای یکسان در محفظة حرارتی (آون) اصلاح شدند. لایه ­ها جور و چسب‌زنی شدند. برای ساخت الوار لایه ­ای چند‌سازه از دمای پرس (135 درجة سانتی‌گراد)، فشار (35 کیلوگرم بر مترمکعب)، دانسیته (0/8 کیلوگرم بر متر مکعب) استفاده شد. از الوار لایه ­ای چند‌سازة ساخته شده؛ پایه‌ها، قیدهای حمایتی، کناره ­بری، اندازة بری، کم­کنی، ساخت اتصال کام و زبانه برای ساخت صندلی انجام شد. صندلی ساخته‌شده با دستگاه آزمون و براساس استانداردهای 12520EN (استاندارد ملی ایران 18688)، 1022EN (استاندارد ملی ایران 9184) و 1728EN (استاندارد ملی ایران 11527) تست شد و از طریق ضربات با جک پنوماتیکی و ثبت جابجایی عضو­های صندلی با سنسور (پتانسیومتر) خطی انجام شد. نتایج مقایسة داده ­های کمی و کیفی نشان داد، پارامتر­های آزمون و الزامات استحکام، دوام و ایمنی صندلی ساخته شده مطابق استانداردهای ملی و بین ­المللی مورد تأیید است. تجزیه ‌و‌ تحلیل داده‌های دیتالاگر، شروع یک ضربة شدید به پشتی صندلی و سیگنال از آستانه در جهت مثبت یا منفی زیاد ثبت شده بود. تمام آزمون‌های نه‌گانه استاندارد ملی ایران بر محل مورد نظر در صندلی و با اعمال نیروی مشخص انجام شد. از این روش نوآورانه جهت ساخت انواع الگوهای صندلی می‌توان استفاده کرد. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Feasibility study of manufacturing chairs from modified date palm laminated timber

نویسندگان [English]

  • mostafa Maleki Golandouz 1
  • Ali Bayatkashkoli 1
  • Hadi Gholamiyan 1
  • Hamid Zare Hosseinabadi 2
1 Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Zabol, Zabol, Iran.
2 Department of Wood and Paper Science and Technology, Faculty of Natural Resources, University of Zabol, Zabol, Iran.
چکیده [English]

Date palm is considered a lignocellulosic material resource in Iran, but due to its unique anatomy and non-woody structure, its properties differ from conventional wood. This study investigated the feasibility of manufacturing an innovative chair using multilayer laminated timber made from date palm trunks. The trunks were processed following ISO 24294 standards, cut into four pieces with a band saw, and sliced into 3.5 mm-thick layers. These layers were thermally modified in an oven at 160 °C for 2 hours. After alignment and gluing, they were pressed at 135 °C with 35 kg/cm² pressure and a target density of 0.8 g/cm³ to produce laminated timber. This material was used to fabricate components such as bases, support brackets, edge and size cuts, chamfers, and tongue-and-groove joints. The finished chair was tested according to EN 12520 (ISIRI 18688), EN 1022 (ISIRI 9184), and EN 1728 (ISIRI 11527) standards using a mechanical testing device. Impacts were applied with a pneumatic jack, and displacement of chair parts was recorded using linear potentiometer sensors. Data collected via data logger indicated that the chair met national and international requirements for strength, durability, and safety. In all nine standardized tests, performance thresholds were properly recorded, and critical stress points were identified, enabling preventive design improvements. This innovative approach demonstrates the potential of modified date palm laminated timber for producing various chair designs.

کلیدواژه‌ها [English]

  • Chair
  • Date palm
  • Laminated plywood
  • Thermal modification
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