针对我国4家胶合木企业的两类产品进行了从摇篮到大门阶段的碳足迹评价,并评估了其生命周期不同阶段的碳储量。研究表明:运输阶段是胶合木碳足迹的主要来源,占比超72%。原料获取阶段的碳排放主要来源于锯材,生产阶段的碳排放与电力消耗...针对我国4家胶合木企业的两类产品进行了从摇篮到大门阶段的碳足迹评价,并评估了其生命周期不同阶段的碳储量。研究表明:运输阶段是胶合木碳足迹的主要来源,占比超72%。原料获取阶段的碳排放主要来源于锯材,生产阶段的碳排放与电力消耗及不同省份电力排放因子密切相关。正交胶合木因高能耗工序及大面积施胶,其电能及胶黏剂导致的碳排放高于层板胶合木。在同类型胶合木中,产品及层板结构、树种和运输路径亦影响其碳足迹。胶合木是天然储碳建材,其碳储量为736.6~883.9 kg CO_(2)e/m^(3),在使用阶段可长期稳定封存。胶合木的回收利用可延长碳储期,但不合理的废弃处理方式可能导致部分碳储释放,从而造成更高的碳排放。研究结果可为胶合木行业提供数据参考和理论借鉴。展开更多
This study explores a novel method for processing cotton stalks—an abundant agricultural byproduct—into long strips that serve as sustainable raw material for engineered bio-based panels.To evaluate the effect of ra...This study explores a novel method for processing cotton stalks—an abundant agricultural byproduct—into long strips that serve as sustainable raw material for engineered bio-based panels.To evaluate the effect of raw material morphology on panel’s performance,two types of cotton stalk-based panels were developed:one using long strips,maintaining fiber continuity,and the other using ground particles,representing conventional processing.A wood strand-based panel made from commercial southern yellow pine strands served as the control.All panels were bonded using phenol-formaldehyde resin and hot-pressed to a target thickness of 12.7 mm and density of 640 kg/m^(3).Their mechanical and physical properties were evaluated through internal bond,bending,thickness swelling,and water absorption tests.Both cotton stalk-based panels showed improved bonding performance compared to the control.The internal bond of the strip-based panel was nearly four times higher than that of the control,while the particlebased panel exceeded it by a factor of two.The strip-based panel showed approximately 15% lower bending stiffness than the wood strand-based panel,yet it surpassed it in load-carrying capacity by 5%.In contrast,the particleboard showed significantly lower bending performance than the strip-based and control panels,despite particle processing being a more conventional method.Both cotton stalk-based panels exhibited higher water absorption and thickness swelling than the wood strand panel.Overall,cotton stalk-based panels—particularly those using strip processing—show promisingmechanical properties,suggesting potential applications in sheathing,furniture,and interior paneling.However,improvements in dimensional stability are needed for broader use.展开更多
文摘针对我国4家胶合木企业的两类产品进行了从摇篮到大门阶段的碳足迹评价,并评估了其生命周期不同阶段的碳储量。研究表明:运输阶段是胶合木碳足迹的主要来源,占比超72%。原料获取阶段的碳排放主要来源于锯材,生产阶段的碳排放与电力消耗及不同省份电力排放因子密切相关。正交胶合木因高能耗工序及大面积施胶,其电能及胶黏剂导致的碳排放高于层板胶合木。在同类型胶合木中,产品及层板结构、树种和运输路径亦影响其碳足迹。胶合木是天然储碳建材,其碳储量为736.6~883.9 kg CO_(2)e/m^(3),在使用阶段可长期稳定封存。胶合木的回收利用可延长碳储期,但不合理的废弃处理方式可能导致部分碳储释放,从而造成更高的碳排放。研究结果可为胶合木行业提供数据参考和理论借鉴。
基金supported by the intramural research program of the U.S.Department of Agriculture,National Institute of Food and Agriculture,Biobased Economy Through Biobased Products,under Award#2023-68016-40132.
文摘This study explores a novel method for processing cotton stalks—an abundant agricultural byproduct—into long strips that serve as sustainable raw material for engineered bio-based panels.To evaluate the effect of raw material morphology on panel’s performance,two types of cotton stalk-based panels were developed:one using long strips,maintaining fiber continuity,and the other using ground particles,representing conventional processing.A wood strand-based panel made from commercial southern yellow pine strands served as the control.All panels were bonded using phenol-formaldehyde resin and hot-pressed to a target thickness of 12.7 mm and density of 640 kg/m^(3).Their mechanical and physical properties were evaluated through internal bond,bending,thickness swelling,and water absorption tests.Both cotton stalk-based panels showed improved bonding performance compared to the control.The internal bond of the strip-based panel was nearly four times higher than that of the control,while the particlebased panel exceeded it by a factor of two.The strip-based panel showed approximately 15% lower bending stiffness than the wood strand-based panel,yet it surpassed it in load-carrying capacity by 5%.In contrast,the particleboard showed significantly lower bending performance than the strip-based and control panels,despite particle processing being a more conventional method.Both cotton stalk-based panels exhibited higher water absorption and thickness swelling than the wood strand panel.Overall,cotton stalk-based panels—particularly those using strip processing—show promisingmechanical properties,suggesting potential applications in sheathing,furniture,and interior paneling.However,improvements in dimensional stability are needed for broader use.
