tailieunhanh - APA Engineered Wodd Handbooks Episode 2

Tham khảo tài liệu 'apa engineered wodd handbooks episode 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER TWO__ WOOD STRUCTURAL PANELS William A. Baker . Manager Codes and Engineering TSD INTRODUCTION The variety of wood structural panels available today was born out of necessity a response to changes in wood resources manufacturing and construction trends. A wood structural panel also referred to as a structural-use panel is a panel product composed primarily of wood which in its commodity end use is essentially dependent upon certain mechanical and or physical properties for successful performance in service. Such a product is identified in a manner clearly conveying its intended end use. Today wood structural panels include all-veneer plywood composite panels containing a combination of veneer and wood-based material and mat-formed panels such as oriented strand board. In the early days of plywood manufacture every mill worked with the same species and technology. Manufacturing techniques didn t vary much from mill to mill. To produce panels under prescriptive standards a mill used wood of a certain species peeled it to veneer of a prescribed thickness then glued the veneers together in a prescribed manner using approved adhesives. As technology changed mills started using a broader range of species and different manufacturing techniques. With the development of . Product Standard PS 1-66 for Softwood Plywood Construction and Industrial 1 three existing plywood standards were combined into one. And for the first time span ratings were incorporated into the standard. The span rating concept would later be used as a basis for the development of performance standards. At the same time there was growing concern over efficient use of forest resources. Working in cooperation with the . Forest Service the American Plywood Association APA now APA The Engineered Wood Association tested panels manufactured with a core of compressed wood strands and traditional wood veneer on the face and back for use in structural applications. By using cores of

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