Tappi Journal最新文献_第4页

Prehydrolysis kraft pulping of jute cutting and caddis mixture for rayon production 用于人造丝生产的黄麻与毛石混合物的预水解硫酸盐制浆

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2019-06-01 DOI: 10.32964/TJ18.5.287

Jannatun Nayeem, M. Jahan, Razia Sultana Popy, M. Uddin, M. A. Quaiyyum

{"title":"Prehydrolysis kraft pulping of jute cutting and caddis mixture for rayon production","authors":"Jannatun Nayeem, M. Jahan, Razia Sultana Popy, M. Uddin, M. A. Quaiyyum","doi":"10.32964/TJ18.5.287","DOIUrl":"https://doi.org/10.32964/TJ18.5.287","url":null,"abstract":"Jute cutting, jute caddis, and cutting-caddis mixtures were prehydrolyzed by varying time and temperature to get about 90% prehydrolyzed yield. At the conditions of 170°C for 60 min of prehydrolysis, the yield for 100% jute cutting was 76.3%, while the same for jute caddis was only 67.9%. But with prehydrolysis at 150°C for 60 min, the yield was 90% for jute cutting, where 49.94% of original pentosan was dissolved and prehydrolysis of jute caddis at 140°C in 60 min yielded 86.4% solid residue. Jute cutting-caddis mixed prehydrolysis was done at 140°C for 30 min and yielded 92% solid residue for 50:50 cutting-caddis mixtures, where pentosan dissolution was only 29%. Prehydrolyzed jute cutting, jute caddis, and cutting-caddis mixtures were subsequently kraft cooked. Pulp yield was only 40.9% for 100% jute cutting prehydrolyzed at 170°C for 60 min, which was 10.9% lower than the prehydrolysis at 140°C. For jute cutting-caddis mixed prehydrolysis at 140°C for 45 min followed by kraft cooking, pulp yield decreased by 3.3% from the 100% cutting to 50% caddis in the mixture, but 75% caddis in the mixture decreased pulp yield by 6.7%. The kappa number 50:50 cutting-caddis mixture was only 11.3. Pulp bleachability improved with increasing jute cutting proportion in the cutting-caddis mixture pulp.","PeriodicalId":22255,"journal":{"name":"Tappi Journal","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45266726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A novel approach for determining the reactivity of dissolving pulp based on the COD method 一种基于COD法测定溶解浆反应性的新方法

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2019-06-01 DOI: 10.32964/TJ18.5.279

Chen Gong, Li Yanzhao, Niu Jianping, Yang Xiaobo, T. Chao

引用次数: 0

Understanding extensibility of paper: Role of fiber elongation and fiber bonding 了解纸张的延展性:纤维伸长率和纤维粘合的作用

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2019-05-05 DOI: 10.32964/TJ19.3.125

Jarmo Kouko, Thomas Turpeinen, A. Kulachenko, U. Hirn, E. Retulainen

引用次数: 8

Characterization of the redispersibility of cellulose nanocrystals by particle size analysis using dynamic light scattering 动态光散射法研究纤维素纳米晶体的再分散性

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2019-05-01 DOI: 10.32964/TJ18.4.223

Guomin Wu, Qian Li, C. Jin, Zhenwu Kong, Siqun Wang

{"title":"Characterization of the redispersibility of cellulose nanocrystals by particle size analysis using dynamic light scattering","authors":"Guomin Wu, Qian Li, C. Jin, Zhenwu Kong, Siqun Wang","doi":"10.32964/TJ18.4.223","DOIUrl":"https://doi.org/10.32964/TJ18.4.223","url":null,"abstract":"Cellulose nanocrystals (CNCs), which are derived from the most abundant and inexhaustible natural polymer, cellulose, have received significant interest owing to their mechanical, optical, chemical, and rheological properties. In order to transport CNC products conveniently and efficiently, they are ideally dried and stored as powders\u0000using freeze-drying or spray-drying technologies. The redispersibility of CNC powders is quite important for their end use; hence, a convenient method is required to characterize the redispersibility of CNC powders. In this paper, the possibility of characterizing the redispersibility of CNC powders by particle size analysis using dynamic light scattering (DLS) was investigated by comparing the results from transmission electron microscopy (TEM) and DLS. The particle size obtained with DLS approximately matched that obtained with TEM. Compared with TEM, DLS is a quick and convenient method to measure the particle size distribution of CNCs in water. Two kinds of dispersing methods, sonication and high-speed shearing, and two kinds of CNCs prepared by different methods, sulfuric acid hydrolysis and the TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) oxidization method, were used to study the redispersibility\u0000of CNCs. Sonication was more efficient than the high-speed shearing method for nanoscale dispersion of CNC powders in water. CNCs prepared by sulfuric acid hydrolysis could be more easily redispersed in water than those prepared by TEMPO oxidation.","PeriodicalId":22255,"journal":{"name":"Tappi Journal","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47079004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

From biorefineries to bioproducts: conversion of pretreated pulp from biorefining streams to lignocellulose nanofibers 从生物精炼到生物制品:从生物精炼流中预处理纸浆到木质纤维素纳米纤维的转化

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2019-05-01 DOI: 10.32964/TJ18.4.233

Chenggui Sun, R. Chandra, Y. Boluk

引用次数: 0

Priorities for development of standard test methods to support the commercialization of cellulose nanomaterials 开发标准测试方法以支持纤维素纳米材料商业化的优先事项

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2019-05-01 DOI: 10.32964/TJ18.4.245

Stephanie Beck, C. Walker, W. Batchelor

{"title":"Priorities for development of standard test methods to support the commercialization of cellulose nanomaterials","authors":"Stephanie Beck, C. Walker, W. Batchelor","doi":"10.32964/TJ18.4.245","DOIUrl":"https://doi.org/10.32964/TJ18.4.245","url":null,"abstract":"With the growing number of producers and users of cellulose nanomaterials (CNMs), there is an increasing need to develop standard test methods to control production and quality of CNMs. In 2014, a Task Group was formed within the ISO Technical Committee 6 Paper, board and pulps to begin addressing the need for standards. This Task Group, TG 1, was tasked with reviewing existing standards and identifying the need for additional\u0000standards to characterize CNMs. In March 2018, TG 1 launched a survey to ask CNM producers around the world about the importance of having standard procedures to measure and quantify a variety of CNM properties, both physical and chemical. Producers were asked to identify the type(s) of CNM they produced and their scale of production, and to rank the properties for which they felt standard test methods were most important. In this paper, we summarize the survey responses and identify those properties of highest interest for producers of both cellulose nanocrystals (CNCs) and cellulose nano- and microfibril-based materials (CNFs/CMFs). Properties of importance can be divided into three broad groups: i) a standard has either been developed or is under development, ii) a currently used standard could be adapted for use with CNMs, or iii) no standard is currently available and further R&D and consultation with industry is needed before a suitable and well-validated standard can be developed. The paper also examines the challenges of developing new standard methods for some of the key properties—as well as the feasibility and limitations of adapting exiting standards—to CNMs.","PeriodicalId":22255,"journal":{"name":"Tappi Journal","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2019-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45192464","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Octobr 2018

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2018-11-01 DOI: 10.32964/tj17.10

引用次数: 0

July 2018 2018年7月

IF 0.6 4区农林科学

Tappi Journal Pub Date : 2018-07-01 DOI: 10.32964/tj17.07

Sun, Mon, Tue, Wed, Thu, Fri., Sat

引用次数: 4

May 2018 2018年5月

IF 0.6 4区农林科学