竹束单板层积材连续成板预压密实化的工艺及性能

Prepress Densification Technology for Manufactured Bamboo Bundle Laminated Veneer Lumber with Continuous Plate Process and Its Properties

为利用间歇式热压工艺加工大尺寸竹束单板层积材（BLVL），提出采用酚醛树脂胶（PF）和聚醋酸乙烯乳液胶（ PVAc）混配胶液浸渍纤维化竹束单板工艺来增加板坯的初黏性和预压性能，并对预压板坯性能的影响因素进行研究，主要包括m（PF ）∶m（PVAc）、预压时间和预压温度等，分析不同m（PF）∶m（PVAc）对BLVL力学性能的影响。结果表明：m（ PF）∶m（ PVAc）＝6∶1、预压时间为15～30 min、预压温度为50～60℃时，预压板坯的性能较优，制得的BLVL具有较高的力学性能，弹性模量、静曲强度和水平剪切强度分别为：25．47 GPa、255．62 MPa和18．22 MPa。

We used intermittent hot-pressing technology and the resin bath technology to manufacture large size bamboo -bundle laminated veneer （ BLVL） .We investigated the effects of prepressing time , prepressing temperature and the ratio of PF/PVAc on the properties of prepressing BLVL , developed the BLVL and analyzed the properties .The slab got better per-formance in main physical and mechanical properties when the ratio of PF /PVAc was 6∶1, the prepressing time was 15-30 min, and the prepressing temperature is 50-60℃.The BLVL made from this technology was good in the modulus of e-lasticity （MOE）, bending strength （MOR） and shearing strength （SS）,which were 25.47 GPa, 255.62 MPa and18.22 MPa , respectively.