Efficient Production of Poplar Veneer and Plywood
In China poplar is by far the most common domestic wood species used to produce veneer and plywood. Poplar as a raw material has got some features that require special attention and technology. Also panel product specifications differ greatly depending on application and market requirements. First, choosing a proper clone is important to get desired face veneer visual quality, panel strength and surface hardness. Choosing machinery is balancing act between fiber, labor and machinery cost, as well as recovery and end product quality requirements. Poplar blocks are usually crooked, requiring XY- scanning to yield maximum amount of face quality and minimum number of random size strips. To save wood and to avoid glueline problems, tight veneer thickness tolerance must be achieved. In order to get right and constant final moisture content, green veneers have to be sorted by moisture for drying. Also, poplar veneers easily become wavy and brittle during drying, thus requiring good humidity and temperature control of the dryer. Maximum volume recovery is an obvious target, but in addition to that, maximizing value recovery gives the best financial results. Each veneer has to be sorted to right grade, reliably and consistently. This can only be done by a camera grading system. As poplar veneer has got wet pockets rather than large high moisture areas, dry veneer moisture meter with a moisture map feature is an useful tool to avoid bonding problems and press blisters. To maximize face quality recovery, both visual and moisture information has to be combined. In order to minimize compression loss of soft poplar veneers, press shall be equipped with thickness control. All panel handling lines, i. e. panel repairing, trim saw and sanding-grading must have gentle stacking systems in order not to damage soft, sanded face of the panel.
Poplar Aspen Veneer Plywood
Kimmo Suomalainen
Raute Corporation, P. O. Box 69 (Rautetie 2), Fi-15551 Nastola, 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
147-157
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）