نتایج جستجو برای: plywood layer

تعداد نتایج: 283666  

2013
Koji Murata Yashuhiro Watanabe Takato Nakano

A large amount of poplar plywood is now being imported into Japan from China, and as a result, formaldehyde emitted from this plywood represents an undesirable chemical that must be controlled using a chemical catching agent. The aim of this study is to find an approach to reduce the formaldehyde emission of poplar plywood using thermal treatment without employing any chemicals. The experimenta...

2016
Xiangling Zeng Jing Luo Jihang Hu Jianzhang Li Qiang Gao Li Li

The aging resistance properties of poplar plywood prepared with soy protein-based adhesives were investigated. The shear strength of soybean meal/bisphenol epoxy resin (SM/EP) adhesive increased by 197.5% (surface layer) to 1.19 MPa and 153.5% (core layer) to 1.09 MPa compared to soybean meal (SM) adhesive. Wet-dry cycles of 25 ± 3 °C, 63 ± 2 °C, and 95 ± 2 °C accelerated the aging of poplar pl...

2001
Jurkka Kuusipalo

The target was to study and develop industrially suitable methods to apply thermoplastic coatings on plywood. Typically, wear and climatic resistance for wooden sheets, such as chip board and plywood, is achieved by thermosetting resin coating (e.g. phenolformaldehyde). However, economical and environmental issues are driving towards thermoplastic coatings (e.g. polyethylene) in such products. ...

2016
Jing Luo Jianlin Luo Jizhi Zhang Yuanyuan Bai Qiang Gao Jianzhang Li Li Li

Soy-based adhesives inherently possess low water resistance and brittleness, which limit their application on plywood fabrication. This investigation involves using a long chain cross-linker, neopentyl glycol diglycidyl ether (NGDE), to produce an intrinsic toughening effect to reduce the brittleness and improve the water resistance of a soybean meal–based adhesive. The solids content, viscosit...

2012
M. Ashaduzzaman R. Rana M. N. H. Khan M. I. Shams

This paper investigated the potentiality of muli (Melocanna baccifera) for making bamboo mat plywood. Bamboo mat plywood with the length, width and thickness of 2.4 m × 1.2 m × 7 mm was made using liquid urea formaldehyde resin. The physical and mechanical properties of such plywood were compared with the existing market plywood. The average density of bamboo mat plywood was much higher compare...

1997
Jerrold E. Winandy Patricia K. Lebow William Nelson

This report describes the development of a test method and predictive model to estimate the residual bending strength of fire-retardant-treated plywood roof sheathing from measurement of screw-withdrawal force. The preferred test methodology is described in detail. Models were developed to predict loss in mean and lower prediction bounds for plywood bending strength as a function of a screw-wit...

1999
QINGLIN WU

niture-grade plywood. The information is greatly needed for manufacturing, buyUltimate screw withdrawal loads (USWLs) from panel face and edge of furnitureing and selling plywood panels, and for grade southern pine (Pinus spp.) and sweetgum (Liquidambar styraeiflua L.) plywood better construction of ]plywood joints in were evaluated at five moisture contents (MCs). Both face and edge USWL decre...

Journal: :Advances in Mechanical Engineering 2023

The purpose of this study was to investigate the high-velocity impact response and failure modes three-layer sandwich panels consisting aluminum alloy sheets plywood. energy absorption mechanism interaction between plywood core were investigated by a test. Different types bullets used in test, velocity parameters obtained using camera assess damage patterns. A full-scale finite element model es...

2004
Eddie W Price

Deftection of oriented ftakeboards, random ftakeboards, and southern pine plywood was evaluated for small size bending specimens and concentrated loads applied to panels nailed on framing lumber. The ftakeboards con~ed a mixture of southern hardwoods and pine; the plywood was 3-ply l/2-inch and 4-ply ~-inch construction. Tests of both panel ~ons, all load levels and RH cycles showed plywood ben...

2009
Pavlo Bekhta Salim Hiziroglu Olga Potapova Jan Sedliacik

Plywood manufactured from thin veneer sheets of different species is one of the most traditional structural composite panels. The objective of this study was to produce experimental plywood panels using a temperature of 100 °C, which is 10 to 30% lower than typical press temperature of plywood manufacture. It was determined that shear strength characteristics of the samples were not adversely i...

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