| 词条 | Wood warping |
| 释义 |
Wood warping is a deviation from flatness in timber as a result of stresses and uneven shrinkage. Warping can also occur in wood considered "dry" (wood can take up and release moisture indefinitely), when it takes up moisture unevenly, or – especially – is allowed to return to its "dry" equilibrium state unevenly, too slowly, or too quickly. Many factors can contribute to wood warp; wood species, grain orientation, air flow, sunlight, uneven finishing, temperature – even cutting season and the moon's gravitational pull are taken into account in some traditions (e.g., violin making). The types of wood warping include:
Wood warping costs the wood industry in the U.S. millions of dollars per year. Straight wood boards that leave a cutting facility sometimes arrive at the store yard warped. This little understood process is finally being looked at in a serious way. Although wood warping has been studied for years, the warping control model for manufacturing composite wood hasn't been updated for about 40 years. A researcher at Texas A&M University, Zhiyong Cai, has researched wood warping, and was working on a computer software program in 2003 to help manufacturers make changes in the manufacturing process so that wood doesn't arrive at its destination warped after it leaves the mill or factory.[1][2] See also
References1. ^{{Cite web|url=http://today.agrilife.org/2003/04/14/warped-idea-ways-to-stop-swayed-wood-may-be-around-the-bend/|title=WARPED IDEA: WAYS TO STOP SWAYED WOOD MAY BE AROUND THE BEND|last=|first=|date=|website=today.agrilife.org|language=en-US|archive-url=|archive-date=|dead-url=|access-date=2018-09-12}} 2. ^{{cite journal| author=Cai, Zhiyong, Dickens, James R| title=Wood composite warping: Modeling and simulation| journal=Wood and fiber science| year=2004| volume=36| number=2| pages=174–185| publisher=Soc Wood Sc Tech}}
3 : Woodworking|Timber industry|Deformation (mechanics) |
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