打浆过程预添加CMC对杨木APMP浆悬浮液屈服应力的影响

doi:10.3969/j.issn.0253-2417.2017.02.014

Abstract

Abstract: In order to study the influence of the addition of CMC-Na before refining on the yield stress of refined poplar APMP pulp fiber suspension, a certain amounts of CMC-Na were added to the APMP and the APMP were pretreated for 10 min before individually refining by Valley beater and PFI mill. The influences of the refining and CMC-Na pretreatment on the beating degree and yield stress (τ_y) of poplar APMP fiber suspension were analyzed respectively. It was found that the yield stress of the poplar APMP fiber suspensionwith a similar beating degree increased rapidly with the rising of CMC-Na concentration, and the yield stress was accordance with the concentration (C_m)via a power relationship of τ_y=aC_m^b(the values of a and b were closely related with the beating ways and beating degree). After refining under a low concentration by free beating device(e.g. Valley beater), the yield stress of the poplar APMP fibers suspension decreased with the increased beating degree, while reverse results were observed under the medium concentration refining by shiny beating device (e.g. PFI mill). After 2% CMC-Na (based on the dry pulp weight) was added the pulp and pretreated for 10 min, the beating degree of poplar APMP was increased to 48°SR from 45°SR with valley beater refining and ascended to 50°SR from 40°SR with PFI refining. Meanwhile, the yield stresses of the poplar APMP fibers suspension were reached to the minimum value with the same beating conditions, the minimum values of the yield stresses were 16.4 Pa and 22.8 Pa (PFS mass fraction was 3%), respectively.

Key words: poplar, APMP, refining, CMC-Na, yield stress

CLC Number:

TQ35
TS734

CHEN Shurun, SHA Jiulong, HE Jing, WANG Chen, SHEN Jun, ZHANG Hui. Influence of Addition of CMC Before Refining on the Yield Stress of Refined Poplar APMP Pulp Fiber Suspension[J]. Chemistry and Industry of Forest Products, 2017, 37(2): 108-114.

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Influence of Addition of CMC Before Refining on the Yield Stress of Refined Poplar APMP Pulp Fiber Suspension

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