Pre-pressing and Pre-heating via Hot-Air/Hot-Steam Process for the Production of Binderless Medium-Density Fiberboards
Pre-pressing and Pre-heating via Hot-Air/Hot-Steam Process for the Production of Binderless Medium-Density Fiberboards
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DOI：
10.15376/biores.11.3.6613-6624
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发表时间：
2016-08-01
期刊：
影响因子：
1.5
通讯作者：
Kharazipour, Alireza
中科院分区：
文献类型：
--
作者：
Euring, Markus;Kirsch, Alexander;Kharazipour, Alireza
首次将热风/热蒸汽工艺作为中试规模生产中密度纤维板的联合预压和预热系统。预热系统设计用于在热压机压制之前预热纤维垫。使用这种技术，压制时间显着减少，板的性能产生积极的影响;两者都是有效的纸板生产必不可少的。近年来，工业界一直在寻找石化粘合剂的替代品。在欧洲，聚氨酯、聚氨酯是用脲醛树脂粘合的。为了取代脲醛树脂，漆酶介体系统（LMS）被用来激活木材纤维的自凝聚力。结果表明，在最终热压前对LMS和10% UF胶凝体系进行热风/热蒸汽处理，可显著提高胶凝体系的内粘结强度和厚度膨胀率。同时，将热风/热蒸汽工艺与热压工艺相结合，总的热压时间可减少25%。
The hot-air/hot-steam process was used for the first time as a combined pre-pressing and pre-heating system for the production of medium-density fiberboards (MDF) at the pilot scale. Pre-heating systems are designed to pre-heat fiber mats before pressing by hot-presses. Using such techniques, pressing times are reduced significantly and the board properties are influenced positively; both are essential for effective MDF production. In recent years, industry has searched for alternatives to petrochemical binders. Primarily, MDF are bonded by urea-formaldehyde (UF) resins in Europe. To replace UF resins, a laccase-mediator-system (LMS) was used to activate the wood fibers' self-cohesion. It was found that the internal bond strength (IB) and thickness swelling (TS) were noticeably improved by applying the hot-air/hot-steam process before final hot-pressing for both LMS and 10% UF binding systems. Simultaneously, the total pressing time could be reduced by 25% when combining the hot-air/hot-steam process with hot-pressing.