Thin Sheet Of Absorbent Main Factors

This paper is mainly about some factors influencing water absorptivity of tissue paper. AKD neutral sizing and other factors are discussed. The work was carried out in the paper machine procedure and the lab. These results show that some former conclusion of AKD sizing is not accorded with this PM procedure. And it is also pointed out that the sizing mechanism of AKD neutral sizing agent and other neutral sizing agent is different.In the research apart , it is analyzed and researched on some influencing factors emphatically : pulp stock and retention agent ; tiny fibre ; adding point; calcium carbonate, especially the different diameter particle of calcium carbonate and how much calcium hydroxide in calcium carbonate; aluminium ion and anion rubbish; soft calendars ; other chemicals, especially some chemicals with active hydrogen ,etc. And sizing curve of 32g/m" tissue paper produced by this paper machine was signified : when AKD adding amount 570ml/min . at 36.2g/nr of Cobb value presents a flex point form side to side ; when AKD adding amount 2000ml/min , at 16.2g/m2 of Cobb value presents a flex point form side to side : between this two flex point , adding amount of AKD present line relations basically with water absorptivity of tissue paper. Finally analysed the influence factor of Cobb value of the mensurating error.The result of study shows:Adopting AKD neutral sizing the wooden fibre of the broad leaf is more apt to sizing than the wooden fibre of the conifer leaf. This point is different from some existing conclusions.With increasing of the consumption of retention agent, the retention rate of the tiny material improves, the retention rate of AKD improves too, it is effectual to sizing.In practical operation, after refining the fiber is more tiny , the water absorptivity of paper is lower . This is not accord with the former conclusion .Within the range of certain diameter, the retention rate e of the calcium carbonate is decided by average grains of diameter basically, the diameter bigger , the retention rate higher, the diameter smaller , the retention rate lower. The retention rate of filler is high, the absorptivity of the paper is little . PH value of the calcium carbonate cream hascertain influence on retention rate of filler, namely retention rate of the calcium carbonate which is weak alkaline or neutral is higher than the alkaline one, its paper absorptivity is little . The water absorptivity of paper which add titanium become bigger. In this paper machine, the phenomenon of sizing reverses has been not found because of adding calcium carbonate in the course of producing concretly.AKD cream should be added in the thick liquid, join before the calcium carbonate, the water absorptivity of the paper is more steady.The content of moisture of the paper is low, namely improve the temperature of the drying department, is favorable to the stability of the water absorptivity .The gathering of anion rubbish is unfavorable to stability of the water absorptivity of paper with AKD neutral sizing , and a small amount of aluminium ion (PAC ) has contributed to stability of the paper water absorptivity in the system.The soft calendars is very light to influence the paper water absorptive. It can be neglect nearly. This is different from some views.The density of surface sizing liquid is higher, Cobb value of paper is lower. It improve paper water-resistance.As the quantity of cation starch is increased , the paper water absorptivity is reduced gradually.When this sour type saline additive is added , the paper water absorptivity become great.