木다우얼의 接着組立性能 向上

Improvement on the Adhesion-Joint Performance at Assembly of Wooden Dowlas

This study was carried out under the assembly conditions at company and laboratory, for the purpose of acquiring the available adhesion-joint performance of wooden dowels which are being commonly used in jointing the furniture members. In laboratory assembly test, Polyvinyl acetate emulsion resin adhesive(room temperature curing type), urethane resin adhesive and MDI resin were applied to the dowels-joint of members of lumber, PB and MDF in a separate use or a mixed use condition, and then their withdrawal strengths were evaluated. Also, the withdrawal strengths were Investigated according to the elapsed time after gluing and assembly of dowels. There suits were summarized as follows: 1. The withdrawal strength was highest at the lowest diameter 6mm of dowel of tested 6, 8 and 10mm at each member in the company assembly condition. 2. In the laboratory assembly condition, the lumber showed the highest withdrawal strengths, which were subordinated with those at PB and MDF, resulting in th ε almost same withdrawal strengths between two members. 3. According to the types of adhesive and their formulations, th ε withdrawal strengths by urea resin and urethane resin at both separate use and mixed use condition were higher, comparing to that by a single use of poly vinyl acetate resin adhesive. 4. In terms of the developing speed of withdrawal strength by the elapsed time after gluing and assembly of dowels, there was a nearly proportional increase until 24 hrs. after assembly at lumber. On the contrary to this, there was a mild increase until about 6hrs. after assembly at PB and MDF, and there after no difference until 24 hrs. 5. From the above results, it was suggested that th ε handling and conveying of dowels-assembled furniture to other processing or finishing line , if at least 6 hrs. elapse after assembly of dowels at members, can not affect much the withdrawal strengths. Particularly, a good joint strength in this case was obtained with application of urethane resin mixed- urea resin a adhesive.