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Efficient Production of Poplar Veneer and Plywood

机译：杨木单板和胶合板的高效生产

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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.
机译：在中国，杨树是迄今为止用于生产单板和胶合板的最常见的国内木种。作为原料的杨树具有一些需要特别注意和技术的特征。面板产品的规格也因应用和市场需求而有很大差异。首先，选择合适的克隆对于获得所需的饰面板外观质量，面板强度和表面硬度很重要。选择机械是在纤维，人工和机械成本以及回收率和最终产品质量要求之间取得平衡。杨树块通常弯曲，需要进行XY扫描以产生最大量的面部质量和最少数量的随机尺寸条。为了节省木材并避免胶合线问题，必须达到严格的饰面厚度公差。为了获得正确和恒定的最终水分含量，必须对单板进行水分分类以进行干燥。而且，杨木单板在干燥过程中容易变得波浪状和脆性，因此需要对干燥机进行良好的湿度和温度控制。最大数量的回收是一个明显的目标，但除此之外，最大化价值的回收可以带来最佳的财务结果。每个单板必须可靠，一致地分类到正确的等级。这只能通过摄像机分级系统来完成。由于杨木贴面具有湿袋而不是较大的高湿度区域，因此具有水分图功能的干燥贴面水分计是避免粘结问题和压泡的有用工具。为了最大程度地恢复面部质量，必须将视觉和湿度信息结合起来。为了使软杨木贴面的压缩损失最小，压机应配备厚度控制器。所有面板处理线e。面板维修，修边锯和打磨坡度必须具有柔和的堆叠系统，以免损坏面板的打磨过的柔软表面。

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