【摘要】 <正> 一、引言 近年来,我国新设计制造和经过技术改造后的造纸机流浆箱,有相当一部分采用孔板(配上消能棒和导流片或配上匀浆辊作为消能整流元件),或阶梯扩散器作为布浆整流元件,这两种布浆整流元件既用于敞开式流浆箱,也用于气垫式流浆箱和满流式流浆箱。实际使用效果不尽相同,有的反映效果尚好,有的反映问题较多甚至效果不好。出现这种情况的原因虽然是多方面的,但我们认为,主要原因是目前对这两更多还原

【Abstract】 A step diffuser or a holey plate, serving as distributing and rectifying element, is installed in a flat-bottom opentype headbox. Cross and vertical directional velocity profile of stock flow at various locations in the pond of the headbox, are measured. Results show that these elements serve to promote distribution and rectification of the stock in the headbox. Better performance is obtained with the step diffuser, compared with holey plate. Proper design of such rectifying elements and optimum length of headbox pond appear to he key requirements. Step diffuser made from plexiglass through injection moulding proves to be satisfactory, technically and economically.更多还原