指接板生产工艺研究

摘要

[Objective ] The aim was to improve the production technology of finger-jointed board. [ Method ] With China fire,Pinus massoniana,Catalpa bungei,Toona sinensis etc as the main test material,under the adhesive condition of modified urea-formaldehyde resin glue lumber,the optimum production technology parameters for different tree species were obtained by orthogonal experiment with the compressive strength,time ,glue consumption and so on as the study factors. The physical and mechanical properties of the finger-jointed board were studied in order to find out the relationship between the density and the length of finger tenon as well as the compressive strength parallel to grain. [ Result ] The average density of China fire was 0.33 g/cm3 ,the length of finger tenon was 10 ～ 13 mm,parallel-to-grain compressive strength was 46 MPa ,the best combinations of production technology were glue spread 260 g/m2 ,glue pressure time 5 s and compressive strength 0.8 MPa; the average density of Pinus .massoniana was 0.45 g/cm3, the length of finger tenon was 12-14 mm,parallel-to-grain compressive strength was 38 MPa, the best combinations of production technology were glue spread 260 g/m2 ,glue pressure time 3 s and compressive strength 1.1 MPa; the average density of Catalpa bungei was 0. 47 g/cm3, the length of finger tenon was 12 - 14 nun, parallel-to-grain compressive strength was 22 MPa, the best combinations of production technology were glue spread 260 g/m2 ,glue pressure time 5 s and compressive strength 1.6 MPa; the average density of Toona sinensi was 0. 59 g/cm3 ,the length of finger tenon was 12 - 15 nan,parallel-to-grain compressive strength was 21 MPa,the best combinations of production technology were glue spread 260 g/m2, glue pressure time 5 s and compressive strength 1.6 MPa, [ Conclusion ] The formaldehyde emission was up to E1 standard,which improved the production technology and quality of the finger-jointed board.%[目的]对指接板生产工艺条件进行改进研究.[方法]利用杉木、马尾松、楸树、香椿等几个主要用材树种作为试制材料,在改性脲醛树脂胶黏剂的胶合下,以胶压强度、时间、施胶量作为工艺条件研究因子,采用正交试验设计,得到不同树种最优生产工艺参数.通过指接板的物理力学性状的研究,寻找到密度、指榫长度之间的关系,以及顺纹抗压强度.[结果]杉木平均密度0.33 g/cm,指榫长10～13mm,顺纹抗压强度46 MPa,工艺条件最佳组合涂胶量260 g/m,胶压时间5 s.胶压强度0.8 MPa;马尾松平均密度0.45 g/cm,指榫长12～14mm,顺纹抗压强度38 MPa,工艺条件最佳组合涂胶量260 g/m,胶压时间3 s,胶压强度1.1 MPa;楸树平均密度0.47 g/cm,指榫长12～14 mm、顺纹抗压强度22 MPa,工艺条件最佳组合涂胶量260 g/m.胶压时间5 s,胶压强度1.6 MPa;香椿平均密度0.59g/cm.指榫长12～15mm,顺纹抗压强度21 MPa,工艺条件最佳组合涂胶量260 g/m,胶压时间5 s,胶压强度1.6 MPa.[结论]其甲醛释放量达到E标准,使指接板的生产工艺得到改进,板材质量得到提高.