This paper addresses a circular economy strategy for the medium density fiberboard (MDF) industry by effectively recycling fibers from MDF residues as raw materials, additionally reducing waste discharge, preserving the ecological environment, saving the wooden resources, and relieving the shortage of raw materials. The work specifically discussed the characteristics and bonding properties of the recycled fibers from the MDF offcuts by the cooking and beating method. The morphology of the recycled fibers was compared with that of the virgin fibers, and then the chemical characteristics of the recycled fibers were analyzed with XPS. Finally, the bonding properties between the recycled fibers and some virgin fibers were compared. The results showed that the fiber length of the recycled fibers is about 12% shorter than that of the virgin fibers and the percentage of shorter fibers (≤0.68 mm) is higher for the former than the latter, in addition, the broken ends ratio of the recycled fibers is 17% higher than that of the virgin fibers, while there is no significant difference in the fiber width and its distribution. SEM and XPS characterizations confirmed that there are some cured UF resin on the surface of the recycled fibers. The MOE, MOR, and IB of the recycled MDF is 5, 10 and 11% respectively lower than those of the fresh MDF manufactured with the virgin fiber, but its TS is 12% lower than that of the fresh MDF, this means that the recycled fiber MDF is more dimensionally stable and water resistant.

本文针对中密度纤维板（MDF）行业的循环经济策略，通过有效地回收以MDF残余物为原料的纤维，另外减少废物排放，保护生态环境，节省木材资源，并缓解原材料短缺。该工作特别讨论了通过蒸煮和打浆方法从中纤板切屑中回收的纤维的特性和粘合性能。比较了再生纤维和原始纤维的形态，然后用XPS分析了再生纤维的化学特性。最后，比较了再生纤维和一些原生纤维之间的粘合性能。结果表明，再生纤维的纤维长度比原始纤维短约12％，前者的短纤维百分比（≤0.68mm）比后者高，此外，断头比大。再生纤维比原始纤维高17％，而纤维宽度和分布没有显着差异。SEM和XPS表征证实，在回收纤维的表面上存在一些固化的UF树脂。再生MDF的MOE，MOR和IB分别比使用原生纤维制造的新鲜MDF的MOE，MOR和IB低5％，10％和11％，但其TS比新鲜MDF的MOE，MOR和IB低12％，这意味着再生纤维中密度纤维板在尺寸上更稳定，更耐水。前者比后者高68mm），此外，再生纤维的断头率比原始纤维高，但断头率在纤维宽度和分布上没有显着差异。SEM和XPS表征证实，在回收纤维的表面上存在一些固化的UF树脂。再生MDF的MOE，MOR和IB分别比使用原始纤维制造的新鲜MDF的MOE，MOR和IB低5％，10％和11％，但其TS比新鲜MDF的MOE，MOR和IB低12％，这意味着再生纤维中密度纤维板在尺寸上更稳定，更耐水。前者比后者高68mm），此外，再生纤维的断头率比原始纤维的断头率高17％，而纤维宽度和分布没有显着差异。SEM和XPS表征证实，在回收纤维的表面上存在一些固化的UF树脂。再生MDF的MOE，MOR和IB分别比使用原生纤维制造的新鲜MDF的MOE，MOR和IB低5％，10％和11％，但其TS比新鲜MDF的MOE，MOR和IB低12％，这意味着再生纤维中密度纤维板在尺寸上更稳定，更耐水。SEM和XPS表征证实，在回收纤维的表面上存在一些固化的UF树脂。再生MDF的MOE，MOR和IB分别比使用原生纤维制造的新鲜MDF的MOE，MOR和IB低5％，10％和11％，但其TS比新鲜MDF的MOE，MOR和IB低12％，这意味着再生纤维中密度纤维板在尺寸上更稳定，更耐水。SEM和XPS表征证实，在回收纤维的表面上存在一些固化的UF树脂。再生MDF的MOE，MOR和IB分别比使用原生纤维制造的新鲜MDF的MOE，MOR和IB低5％，10％和11％，但其TS比新鲜MDF的MOE，MOR和IB低12％，这意味着再生纤维中密度纤维板在尺寸上更稳定，更耐水。