Effect of Veneer Peeling Speed in Theory and Practise
In veneer peeling, wood fracture occurs in much the same way as in other wood cutting processes, however, there are several features that make veneer peeling a special case with regard to cutting. Since veneer is relatively thin, the effective forces during cutting influence both surfaces of the veneer. Even some subsurface effects may affect the veneer quality too. After conditioning, the logs that form the bolts for peeling have high water content. Some of this water is forced out from wood during peeling, but the exact effect on cutting is not known. Water pressure may rupture the wood structure or the water may act as lubricant, easing cutting. The nose bar pressure creates the necessary stress distribution to form strong enough veneer for further processing. The peeling speed effect consists of the actual cutting speed and the rotational speed of the bolt. While the bolt diameter is decreasing peeling progresses, the cutting speed decreases if the rotational speed is not increased. The purpose of the study is to explain, how the Peeling speed affects the cut surface of the veneer. Surfaces of veneers peeled with low and high cutting speed are compared. Methods for comparison are light microscopy, confocal microscopy and surface roughness measurements. The peeling tests were made using an industrial scale laboratory veneer lathe. Finnish spruce and birch were used in the first tests. The importance of understanding the effects of peeling speed will be useful in obtaining uniform veneer strength and surface quality. In addition, it gives important information for conducting tests with different lathe knives.
veneer peeling cutting speed lathe checks micro-bevel lathe knife
T. Kotilahti A. Rohumaa T. Antikainen
Laboratory of Wood Technology, Helsinki University of Technology, Finland
国际会议
The Third International Symposium on Veneer Processing and Products(第三届国际胶合板制造技术研讨会)
上海
英文
141-145
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）