Development of continuous pressing method for producing LVL cylinder

LVL圆筒连续压制法的开发

• 批准号: 04556025
• 负责人: SASAKI Hikaru
• 金额: $ 9.34万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04556025/
• 关键词: Continuous pressing; Cylindrical LVL; Laminated veneer lumber; Press-drying; Finger-jointing; Urethane foam; フインガージョイント; 蒸気噴射プレス; 木質複合材料

An improved press-drying method of SUGI veneers which were used as raw materials for LVL cylinders in the present Research was proposed. The experimental results showed the new method was more effective than the conventional ones. An end-jointer for making finger-type joints of veneers was designed. The machine set up in trial worked well and the jointed parts made by this machine had strength comparable with that of non-jonted parts.A caterpillar-type continuous press with a radio ferquency heating function was used for pressing an endless molding LVL.The press had a pressing part 300 mm wide and 700 mm long. Molding jigs made of wood with electrodes were used one after the other to make a continuous mold pressing. The products are 1/6 parts of a LVL cylinder with 390 mm outer diameter and 30 mm thickness. The experimental results showed the feasibility of this method in the production rate of 1 m/min if the length of the pressing part was extended to 7 m.Six pieces of the molded LVLs were edge-jointed in tang-and-groove type joints with RF glue to make a hollow cylindrical post of 5, 400 mm length. Urethane resin foam with density of 0.38 g/cm^2 was filled inside the post. The filling was very effective to improve the lateral compressive strength by 40 times as that of a non-filled post. The stress distribution was calculated by the finite element method and used for the prediction of the failure criteria.Slender veneer tapes of lateral direction reinforced with craft papers were winded to a heated mandrill to manufacture an LVL with helical-winded veneers. This technique is commonly used for manufacturing paper tubes. The trial seemed successful and the application of the technique to LVL production will be promising.

本研究提出了一种改进的单板挤压干燥方法，用于单板层积材圆筒的原材料。实验结果表明，该方法比传统的方法更有效。设计了一种用于制作单板指形接头的端接机。试制的成型机工作正常，所制成的接合部强度与无接合部相当。采用具有射频加热功能的履带式连续压力机对环形模压板材进行压制，压制部宽300 mm，长700 mm。用带电极的木材制成的模具，一个接一个地用来进行连续的模压。产品为外径390 mm、厚度30 mm的单板层积材圆筒的1/6零件。实验结果表明，如果将压制部的长度延长到7m，则该方法在1m/min的生产速度下是可行的。将6块成型的单板层积板用RF胶在齿槽式接头上进行边连接，制成长度为5400 mm的中空圆柱形桩。桩内填充密度为0.38g/cm2的聚氨酯泡沫塑料。充填后的桩侧向抗压强度是未充填桩的40倍。用有限元方法计算了单板的应力分布，并用于失效准则的预测。将工艺纸增强的横向细长单板带缠绕在加热的心钻上，制成螺旋缠绕单板单板。这项技术通常用于制造纸管。试验结果表明，该技术在单板层积材生产中的应用前景广阔。

项目成果

Hikaru Sasaki and Shuichi Kawai: "Recent Research and Development Work on Wood Composites in Japan" Wood Science and Technology. 28(印刷中). (1994)

Hikaru Sasaki 和 Shuichi Kawai：“日本木质复合材料的最新研究和开发工作”《木材科学与技术》28（出版中）。

佐々木 光: "大阪木工機械協同組合30年の歩み 分担執筆題名“今後の国産材に必要な機械・システム" 大阪木工機械協同組合, 85 (1993)

佐佐木光：“大阪木工机械合作社30年的进步，撰稿人标题：“未来国产木材材料所需的机器和系统”，大阪木工机械合作社，85（1993）

H.Sasaki: "Machines and systems necessary for domestic plantation tembers in the future" The Memorial Issue for the 30th Anniversary of Osaka Wood Machinery Corporation. 85-88 (1993)

H.Sasaki：“未来国内种植林所需的机械和系统”大阪木材机械公司成立30周年纪念特刊。

S.Kawai: "New wood-based materials and the furure" WOOD-PRO. 74-80 (1992)

S.Kawai：“新型木质材料和未来”WOOD-PRO。

Hikaru SASAKI and Shuichi KAWAI: "Recent Research and Develoment with Wood Composites in Japan" Wood Science and Technology.

Hikaru SASAKI 和 Shuichi KAWAI：《日本木质复合材料的最新研究与发展》木材科学与技术。