EFFECT OF NaOH CHARGE ON FIBER CHARACTERISTICS OF P-RC APMP PULP

Fiber screen analysis, fiber quality analysis and SEM observation were used to investigate the effects of NaOH charge on fiber characteristics in Triploid Populus Tomentosa P-RC APMP pulping in this paper. The results showed that increasing NaOH charge in P-RC APMP process could reduce energy consumption and fines percent, increase the mean fiber length and long fiber percent and make the curl index and kink index of fiber ascend. The results from SEM observation illustrated that the fiber with high NaOH charge had higher softness degree, better cutting resistant ability and better inter-fiber bonding ability. With increasing of NaOH charge, the surface of handsheets became more and more smooth, and there were less and less gaps and holes on the paper surface.     

SYNERGISTIC EFFECTS BETWEEN BIRCH CHEMICAL MECHANICAL PULPS AND ASPEN BLEACHED KRAFT PULP

INTRODUCTIONIn papermaking, it is very often that more than one type (or grade) of pulps are used to develop paper sheet properties necessary for both machine runnability and requirement from the end users. In many high end paper grades (e.g., various high brightness printing/writing papers), long fiber from softwood bleached kraft pulp traditionally is often used in combination with short fiber from hardwood bleached kraft pulp (HBKP). In this combination, the long fiber component provi…     

STUDY ON THE ELEMENTAL CHLORINE FREE BLEACHING OF BAMBOO KRAFT PULP

1INTRODUCTIONChina is a country using the most variety of non-wood fiber raw material and is the largest country producing non-wood fiber pulp and paper in the world[1]. Bamboo is one kind of the main non-wood species for papermaking in China. Although the structure of raw materials for papermaking has being adjusted through increasing the proportion of wood pulp and by effectively utilizing waste paper source, non-wood species will still remain an important fiber resource[1,2].At present…     

蔗渣浆全无氯漂白的研究

本本文探讨了在Op段低NaOH用量,P段低H2O2用量的条件下采用OpQP流程将蔗渣浆漂至82%ISO的可行性,并讨论了非硅过氧化氢漂白稳定剂代替硅酸钠用于过氧化氢漂白的可行性。研究表明非硅过氧化氢稳定剂PP-2,PP-1耐高温、高压,可用于压力过氧化氢漂白。在Op段2%NaOH,0.5%H2O2;P段3% H2O2,PP-1 0.1%, PP-2 0.5%条件下,蔗渣浆采用OpQPo流程,漂后浆白度达到85%ISO。OpQPo从根本上消除了AOX的产生,经测定漂白废水属于可生物降解废水,只有Q和P段的部分废水进入废水处理系统, 容易通过常规的污水处理方法达到日益严格的国家排放标准。     

THE TCF BLEACHING OF NS-AQ ASPEN HIGH YIELD CHEMICAL PULP

INTRODUCTIONNowadays, under the pressure of energy crisis, Methods押The pulp was put in the high-density polyethylene plastic bag in the of thermostatic water bath where the pulp was treated with chelated environment pollution and market competition, the pulp industry has being developed in the direction of "Three Highness" and " Three Lowness". "Three Highness" means high yield, high strength and high brightness; on the other hand, " Three Lowness" means low energy consumption, low wa…     

脱果胶试剂在全棉秆化机浆漂白中的应用

通过原子吸收分光光度计(FAAS)对原料中金属离子含量进行定量分析.以果胶酸钙为模型物,考察氢氧化钠、草酸钠等脱果胶试剂对棉秆皮部的果胶脱除及化学成分的影响,进而探讨改进全棉秆化机浆成浆性能的方法.实验结果表明:各脱果胶试剂与果胶酸钙模型物反应速率的关系为2 2 43 4Na C O NaOHNa POv>v>v;用3%草酸钠进行皮部预处理,棉秆皮部果胶脱除率可达到53.72%.对全棉秆化机浆漂白结果显示,当温度90,℃、草酸钠用量3%的预处理条件下,以6.5%NaOH和11%H2O2制得全棉秆化机浆白度可以达到76.2%,尘埃度可降至50.10,mm2/m2.     

STUDY ON FORMAMIDINE SULPHINIC ACID BLEACHING OF POPLAR APMP

Bleaching of poplar APMP with Formamidine sulphinic acid (FAS) was investigated in this paper.The effects of FAS charges, ratio of treatment on the brightness gain, color reduction and pulp strength were studied. A single-stage FAS bleaching was optimized. Under the conditions of 10 % pulp consistency, 60 minutes time and 70℃ reaction temperature and 0.6 %, FAS (on 0.d.pulp), ratio of FAS to NaOH was 2, we produced a bleached pulp with a brightness of 62.3 %(SBD), a brightness gain of 9.2 units.     

马尾松硫酸盐浆两段氧脱木素的影响因素

研究了马尾松硫酸盐浆段间不洗涤时第二段氧脱木素的影响因素。结果表明,在给定的第一段氧脱木素的条件下,第二段氧脱木素采用氧压0．4－0．5MPa、温度80－90℃、时间40－60min、碱用量（质量分数）2％－4％的条件,可以在纸浆粘度不致降低很大的前提下,得到较高的木素总脱除率。     

硫酸盐木浆漂白前木聚糖酶预处理的研究

研究了木聚糖酶用于硫酸盐木浆 H2 O2 漂白前预处理的工艺条件 ,结果表明 ,预处理最佳工艺条件为 :酶用量为每克浆 2 0 IU ,时间 3h,浆浓为 6 %。在相同的 H2 O2 漂白条件下 ,经酶处理后的浆料白度可提高 2 %～ 3% SBD。     

旧报纸的酸性生物酶法脱墨

研究了一种新的废纸脱墨工艺，它是用酸性纤维素酶处理旧报纸浆，然后在酸性条件下进行浮选脱墨，此工艺化学药品用量少，有利于环境保护；所得脱墨浆白度高，黄度低；具有较好的滤水性能和相近的强度性能。利用过氧化氢进行漂白时，酶法脱墨浆的可漂性优于化学法脱墨浆。     

A NEW FAST-GROWING RAW MATERIAL FOR PULP PAPERMAKING-GUANGYECHU

A new pulp papermaking raw material, Guangyechu,is introduced in this paper, including material characteristics and ultilization of bast, wood pole and leaf. The fiber morphological characteristics,chemical composition of wood pole and feasibility of pulping and papermaking by APMP process are studied in the laboratory. The results show that wood pole can be put to use in papermaking industry. The APMP pulp is produced using 5.2% sodium hydroxide and 5.0% hydrogen peroxide. The novel technology has offered breaking length of 4.74km,tearing index 3.08mN @m2 @g-1, brightness of 71.6%ISO, bursting index 2.07 KPa@m2@ g-1, opacity 84.5%and yield of 75.7%. As a pulp for newsprint, offset point paper and information paper, the Guangyechu APMP shows its advantages both quality and cost-efficienty. It is significative to apply the pole of Guangyechu, which is only firing at present to the paper industry.     

PEROXYACID ENHANCED OXYGEN DELIGNIFICATION OF KRAFT PULP

1INTRODUCTIONNew pulping and bleaching technologies, which do not use chlorine-base chemicals, continue to be developed in the pulp and paper industry worldwide to meet stricter environmental regulation and increased public environmental awareness. ECF (Element-chlorine-free) and TCF (Total-chlorine-free) bleaching sequence had been used in bleaching plant to reduce the amount of chlorinated organic compounds in the bleach plant effluent. Oxygen delignification was gradually becoming a …     

废报纸脱墨浆H_2O_2漂前预处理

研究了Na2SO3与DTPA联合用于废报纸脱墨浆H2O2漂前预处理的效果,并与尿素、DTPA、硫酸、EDTA预处理剂的预处理效果进行了比较。结果表明,Na2SO3与DTPA联合是种优良的预处理剂,与其他预处理剂相比,可使漂后浆白度提高1.4%～4.2%ISO。     

微波辐射应用于麦草浆漂白工艺的研究

将微波辐射代替传统水浴加热应用于H2O2麦草浆漂白工艺中。研究了微波辐射时间、辐射功率、H2O2用量和NaOH用量等因素对纸浆漂白效果的影响。通过与传统水浴加热漂白对比发现,达到相应白度时微波辐射漂白时间大大缩短;微波辐射漂白纸浆粘度没有过多下降;微波辐射漂白废水中的残余过氧化物只有水浴漂白的10%。正交实验结果表明H2O2用量的影响最大,其次是微波辐射时间和NaOH用量,影响最小的是微波输出功率。最佳实验条件为微波辐射功率240?W、辐射时间25?min、H2O2用量5％和NaOH用量4％时纸浆白度约为59％ISO,纸浆粘度大于620?mL·g-1,纸浆硬度约为390。     

聚氨酯磨粒侵蚀的机理

研究了聚氨酯分别在含石英砂的清水、聚丙烯酰胺（ＰＡＭ）溶液和氢氧化钠溶液三种介质条件下，磨粒侵蚀过程中所发生的表面物理效应和表面化学效应。利用扫描电子显微镜（ＳＥＭ）、光电子能谱仪（ＸＰＳ）和傅立叶表面红外仪（ＦＴ－ＩＲ－ＡＴＲ）对聚氨酯在磨损前后的表面形貌、元素组成、结合能和官能团作了分析。发现聚氨酯磨粒侵蚀的物理效应是运动颗粒对材料表面的微切削、材料的高疲劳破坏以及塑性断裂，而表面化学效应主要有分子链断裂、热降解、水解和氧化降解。     

蔗渣浆的压力过氧化氢漂白

对烧碱-蒽醌(Soda-AQ)法蔗渣浆分别进行了螯合预处理(Q)和常压过氧化氢(P)、压力过氧化氢(PO)漂白的研究,探讨了单段PO漂白蔗渣浆的可行性.正交试验结果表明,PO漂白蔗渣浆优化的漂白条件为漂白温度100℃、时间80min、压力0.6MPa、NaOH用量0.4%.PO漂白浆的白度较高,达84.0%ISO,特性黏度为825.3mL/g,比QP漂白浆的白度高9.9%ISO;PO漂白浆的物理强度性能也较好,浆料的抗张指数为66.67N.m/g,撕裂指数为9.34mN.m2/g,耐破指数为4.31 kPa.m2/g,耐折度为39次.PO漂白废水的化学耗氧量、生化耗氧量及色度较低,漂白废水可全部逆流回用,大大减少了污染排放.     

THE STUDY ON TCF BLEACHING OF NS REED PULP

In this paper, we have researched TCF bleaching on reed pulp including oxygen delignification, oxygen delignification with H2O2 intensification and H2O2 bleaching. The results show that Op-P bleaching process on NS reed pulp is suitable and the brightness of bleached pulp is up to 82% ISO.     

高速钢基体表面除油对离子镀涂层制备性能的影响

综合采用了化学法、超声波联合化学法、机械喷砂等多种前处理方法,对高速钢基体样品进行除油处理.分析了其微观形貌及在基体处理前后用离子镀气相沉积技术沉积TiAlN涂层的性能.实验结果表明,在相同的情况下,采用化学试剂,NaOH 0.5%～1.0%;Na2SiO33.0%～4.0%;Na2CO35.0%～10.0%;H2O 100%,温度为60～90℃,时间为5～10 min,除油效果较好,离子镀后涂层与基体的结合力较好.     

Fe2O3纳米粒子复合纤维素膜降解有机染料亚甲基蓝

合成Fe2O3纳米粒子复合纤维素膜.采用XRD、TEM和磁力线等多种方法对Fe2O3纳米粒子复合纤维素膜的结构和性能进行表征,并研究Fe2O3纳米粒子复合纤维素膜对亚甲基蓝的降解作用.结果表明：当溶液中H2SO4加量为25.8mol/L、H2O2加量为2.4mol/L时,用5g/L的复合纤维素膜对1.4×10-5 mol/L的亚甲基蓝溶液进行降解,25min内降解率达到100%.     

NEW MANUFACTURING STUDY OF LINERBOARD MATERIALS

INTRODUCTIONAlthough NSSC and mechanical pulps have partly replaced kraft pulps in containerboard manufactur-ing, kraft is the dominant pulping process in our in-dustry. At different paper mills significant efforts have been made to increase the pulp yield without major investments during the past few years. In prin-ciple, the increase in pulp yield can be accomplished by (a) decreasing polysaccharide depolymerization during pulping process thereby increasing the carbo-hydrate content …