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1. 发明授权

US4221630A Wet method of preparing fiberboard products in a substantially closed and balanced white water system 失效
标题翻译：在基本上封闭和平衡的白水系统中制备纤维板产品的湿法
公开(公告)号：US4221630A
公开(公告)日：1980-09-09
申请号：US898385
申请日：1978-04-20
申请人： Stig D. Selander , Karl N. Cederquist
发明人： Stig D. Selander , Karl N. Cederquist
IPC分类号： D21F11/00 , D21F1/00 , D21F1/66 , D21F11/04 , D21C9/18
CPC分类号： D21F11/04 , D21F1/66
摘要： A method of making fiberboard using a substantially closed white water system. One or more layers of separately prepared surface pulp is applied to a layer of base pulp at the wet sheet forming stage. Lignocellulose chips in a pressure-sealed defibrating zone under generation of steam. The steam is separated at the discharge end of the defibrating zone under atmospheric pressure. The atmospheric steam is utilized to presteam the raw chips. The presteamed chips are thereafter dewatered to a moisture content coordinated to the energy demand of the defibrating treatment and the desired generation of steam prior to entering the defibrating zone. The water removed at the dewatering stage is collected for use in preparing the surface layer pulp suspension. A small portion of the base pulp to be used for the surface layer pulp is diverted to a refiner and diluted with water. The major portion of the base pulp is diluted with white water drained off and recycled from the base layer wet sheet forming stage to form a base layer suspension, which suspension is then transported by the white water to the wet sheet forming stage, where the white water and recycled to the base layer suspension stage to form a new base layer suspension. The diverted portion of the base pulp is further diluted with white water recycled from the surface layer forming stage to form a surface layer suspension.A portion of the white water recycled from the wet sheet forming stage to the base layer suspension stage is heated by a portion of the steam separated at the discharge end of the defibrating zone to drive off surplus white water to maintain a constant volume of white water.
摘要翻译：使用基本封闭的白水系统制造纤维板的方法。在湿片形成阶段将一层或多层单独制备的表面纸浆施加到基纸层上。生成蒸汽的压力密封解纤带中的木质纤维素片。在大气压下，在除颤区的排出端分离蒸汽。大气蒸汽用于预先生产原料。然后将预先冷却的芯片脱水至在进行解纤带之前与解纤处理的能量需求协调的水分含量和所需的蒸汽产生量。在脱水阶段除去的水被收集用于制备表层纸浆悬浮液。将用于表层纸浆的一小部分基础纸浆转移至精制机并用水稀释。基浆的主要部分用排出的白水稀释，并从基层湿片形成阶段再循环，形成基层悬浮液，然后将该悬浮液通过白水输送到湿片形成阶段，其中白色水并再循环到基层悬浮液阶段以形成新的基层悬浮液。用从表面层形成阶段再循环的白水进一步稀释基础纸浆的转向部分以形成表面层悬浮液。从湿片形成阶段再循环到基层悬浮阶段的白水的一部分被在解纤带排放端分离的一部分蒸汽加热，以驱除多余的白水以保持恒定体积的白水。

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