The Experts below are selected from a list of 219 Experts worldwide ranked by ideXlab platform

Xu Yong-jia - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Composite Fluffing Technology on Fluff Pulp Properties
    2014
    Co-Authors: Xu Yong-jia
    Abstract:

    Composite Fluffing technology of cellulose fiber in the process of Fluff Pulp making was researched using pinus massoniana lamb as the raw material. Effects of composite Fluffing technology on the fiber morphology were observed by optical microscope and SEM. The hemicellulose content of the fiber and its post color number were also detected when it was treated by composite Fluffing technology. In addition, properties of the self-made Fluff Pulp were compared with American Golden Isles Fluff Pulp and 480 import Fluff Pulp. It revealed that the fiber became smooth and curve when it was treated by composite Fluffing technology, large area of the fiber surface was removed, which would contribute to improvement of fiber absorbility. The hemicellulose content of the fiber decreased from 8.65% to 7.12%, it decreased by 17.69%, post color number of the Pulp was 0.26, which indicated that the rather short time treatment of composite Fluffing technology can be used to make Fluff Pulp. Besides, comparison of selfmade Fluff Pulp properties to that of the import Fluff Pulp showed that property parameters of self-made Fluff Pulp can meet the requirement of the Fluff Pulp standards.

  • A New Fluff Pulp Preparation Technology
    2014
    Co-Authors: Xu Yong-jia
    Abstract:

    Using pinus massoniana kraft Pulp as raw material,the effects of Fluff Pulp preparation technology including alkali( NaOH) dosage,hydrogen peroxide( H2O2) dosage,temperature and concentrated alkaline treatment time on the Fluff Pulp properties were investigated. It showed that the optimal technology was as the follows: NaOH dosage 8%,H2O2dosage 1. 8%,temperature 70℃,concentrated alkaline treatment time 10 min. The brightness of the Pulp was 76. 1% ISO and increased 51. 6% compared with the original kraft Pulp,burst index was 0. 57 kPa·m2/ g and decreased 48. 2%,density and the absorption time decreased 11. 8%,47. 5%,respectively. Meanwhile,absorption and dry bulkiness of the Pulp decreased 8. 32%,5. 43%,respectively. The brightness of the Pulp reached 82. 4% ISO when it was further bleached with H2O2,while other properties of the Pulp met to the requirement of the national standard GB/T 21331—2008.

  • Research progress of antibacterial cellulose/cellulose fiber
    Journal of Shaanxi University of Science & Technology, 2014
    Co-Authors: Xu Yong-jia
    Abstract:

    The commonly used inorganic antibacterial agent and organic antibacterial agent, and their types and antibacterial mechanism were introduced.Silver antibacterial cellulose, nano TiO2 antibacterial cellulose,quaternary ammonium antibacterial cellulose,chitosan modified bacterial cellulose and other antimicrobial cellulose and its application in the textile industry,film material and other applications were elaborated.According to the selected type of antibacterial agent,cellulose and cellulose fibers can be modified by chemical or physical method,Fluff Pulp is Fluffed cellulose fibers used in disposable sanitary absorbent mat,and Fluff Pulp can improve its quality and function by antibacterial modified.Paper introduced the possible antimicrobial agent and methods can be used in the antibacterial modified of Fluff Pulp fibers,and the potential prospect of antibacterial modified of cellulose fibers in the production and application Fluff Pulp.Meanwhile the problems and solutions were presented in the production and application of antibacterial cellulose and cellulose fiber.

  • Application of Ultrasonic Pretreatment on Fluff Pulp Preparation
    2013
    Co-Authors: Xu Yong-jia
    Abstract:

    Pinus Massoniana Pulp was chose as the raw material in this paper,effects of ultrasonic wave pretreatment on fiber ultrastructure were observed by optical microscope and SEM.And the changes of fiber absorption were investigated.Influence of ultrasonic wave pretreatment method on crystalline structure of the fiber was also analyzed by wide-angle X-ray diffraction.Then the feasibility of ultrasonic wave pretreatment method used into Fluff Pulp making would be researched.It revealed that after ultrasonic wave pretreatment,ultrastructure of the fiber changed inordinately,several ravines generated on the fiber surface because of strong energy released by the ultrasonic wave.The cavitation of ultrasonic wave would facilitate inner-fibrillation of the fiber.Absorption and WRV of the fiber after ultrasonic wave pretreatment increased 23.49%,16.47%,respectively.Crystallinity of the fiber decreased from 52.94% to 40.98%,it decreased by 20.59%.The decreasing of fiber crystallinity was also conducive to improvement of fiber absorbability,so that it was meaningful that ultrasonic wave pretreatment method could be used into Fluff Pulp making.

  • Method of composite Fluffing technology and its effect on properties of Fluff Pulp fiber
    Journal of Shaanxi University of Science & Technology, 2013
    Co-Authors: Xu Yong-jia
    Abstract:

    Composite Fluffing technology of cellulose fiber in the process of Fluff Pulp making was researched using pinus massoniana lamb as the raw material.Effects on Fluff Pulp properties of two composite Fluffing technologies were compared.It indicated that bleaching the virgin fiber initially and then treating it with enormous alkali towards the end of bleaching was the more preferable method.It also revealed that when fiber was treated by this method,brightness of it was 76.13%ISO and increased 51.71%,burst index was 0.57kpa·m2/g and decreased 48.18%,the absorption time was 8.42sand decreased 46.64%in comparison with virgin fiber.Meanwhile,absorption and dry bulkiness of the fiber decreased 10.23%,6.63%,respectively.In addition,rationality of the more preferable method for its effects on fiber properties was also researched.

Marc Delgado-aguilar - One of the best experts on this subject based on the ideXlab platform.

  • TEMPO-Oxidized Cellulose Nanofibers: A Potential Bio-Based Superabsorbent for Diaper Production.
    Nanomaterials, 2019
    Co-Authors: Josefina Patiño-masó, Ferran Serra-parareda, Quim Tarrés, Pere Mutjé, F. Xavier Espinach, Marc Delgado-aguilar
    Abstract:

    Single-use plastics are expected to disappear, mainly due to the rise of stricter regulations to combat their impact on the environment. As an example, the recent European Directive on Single-Use-Plastics (SUP) will be implemented between 2021 and 2024 and will directly prohibit the use of some SUP. Baby diapers are one of the most used single-used products in our daily lives, and it is estimated that most of the ~4000 diapers that each baby uses in their life go to landfill. Such diapers usually contain superabsorbent polymers (SAP) that are based on acrylic acid-acrylamide mixtures with high water retention capacity, but they are neither bio-based nor biodegradable. In this work, we have developed bio-based superabsorbent aerogels made of cellulose nanofibers (CNF) and propose their potential use in baby diapers. TEMPO-oxidized CNF at different oxidation degrees were prepared and tested. The obtained CNF exhibited higher free swelling capacity (FSC) than the commercial Fluff Pulp (ranging from 117.62% to 245.21% higher) and also than the diaper absorbent, except for CNF-5 (ranging from 31.56% to 54.55%), even under compression. Overall, the present work shows a case study where CNF could have a potential application with market opportunities.

Delgado Aguilar Marc - One of the best experts on this subject based on the ideXlab platform.

  • TEMPO-Oxidized Cellulose Nanofibers: A Potential Bio-Based Superabsorbent for Diaper Production
    MDPI (Multidisciplinary Digital Publishing Institute), 2020
    Co-Authors: Patiño Masó Josefina, Serra Parareda Jordi, Tarrés Farrés Quim, Mutjé Pujol Pere, Espinach Orús Xavier, Delgado Aguilar Marc
    Abstract:

    Single-use plastics are expected to disappear, mainly due to the rise of stricter regulations to combat their impact on the environment. As an example, the recent European Directive on Single-Use-Plastics (SUP) will be implemented between 2021 and 2024 and will directly prohibit the use of some SUP. Baby diapers are one of the most used single-used products in our daily lives, and it is estimated that most of the ~4000 diapers that each baby uses in their life go to landfill. Such diapers usually contain superabsorbent polymers (SAP) that are based on acrylic acid-acrylamide mixtures with high water retention capacity, but they are neither bio-based nor biodegradable. In this work, we have developed bio-based superabsorbent aerogels made of cellulose nanofibers (CNF) and propose their potential use in baby diapers. TEMPO-oxidized CNF at different oxidation degrees were prepared and tested. The obtained CNF exhibited higher free swelling capacity (FSC) than the commercial Fluff Pulp (ranging from 117.62% to 245.21% higher) and also than the diaper absorbent, except for CNF-5 (ranging from 31.56% to 54.55%), even under compression. Overall, the present work shows a case study where CNF could have a potential application with market opportunitiesThis research was funded by the Spanish Ministry of Economy and Competitiveness in the frame of NANOPROSOST project, grant number CTQ2017-85654-C2-1-

Jean Luc Rols - One of the best experts on this subject based on the ideXlab platform.

  • Biodegradability of lignosulphonate by Streptomyces viridosporus strain T7A and a mixed natural microbial population : Antagonistic effects
    Acta Biotechnologica, 2004
    Co-Authors: G. Hernandez-pérez, Gérard Goma, Jean Luc Rols
    Abstract:

    The ability of a mixed natural microbial population, collected in an aerated lagoon treating Fluff Pulp effluent and Streptomyces viridosporus strain T7A, to degrade lignosulphonate was evaluated. S. viridosporus growing in a mineral medium containing glycerol (7 g/l) and lignosulphonate (1 g/l) allowed 20% of lignosulphonate to be degraded after 18 days of incubation. A culture of the mixed population on culture medium after S. viridosporus growth was unable to degrade lignosulphonate products. Moreover, antagonism between S. viridosporus and the mixed population or between S. viridosporus and the isolated strains from this population was observed. The enhancement of lignosulphonate biodegradation by naturally occurring microorganisms in association with S. viridosporus (bioaugmentation strategy) seems to be difficult.

  • Enhanced degradation of lignosulfonated compounds by Streptomyces viridosporus
    Water Science and Technology, 1999
    Co-Authors: G. Hernandez-pérez, Gérard Goma, Jean Luc Rols
    Abstract:

    Degradation of lignosulfonated compounds by S. viridosporus strain T7A on nutritive or mineral culture media was quantified. Two lignosulfonated compounds, differing in their molecular mass distributions and chemical structures, were used: lignosulfonate (1–80 kDa) and vanisperse, a sulfonated oxylignin (1–20 kDa). The use of nutritive culture medium (containing Biosoyase) enhanced both the growth of S. viridosporus and production of lignin peroxidase (LiP) leading to enhanced lignocellulose degradation, but no lignosulfonated compound degradation was observed. A fraction of these compounds underwent a molecular transformation, producing non-biodegradable acid precipitable polymeric lignin (APPL). When a mineral culture medium (containing glycerol as additional organic carbon source) was used, approximately 21 and 35% of lignosulfonate and vanisperse were respectively degraded, with little APPL production. LiP activity was growth-associated and significant modifications of molecular mass distributions of both lignosulfonated compounds were observed. A mixed natural microbial population, collected in an aerated lagoon treating Fluff Pulp effluent, was used to evaluate the biodegradability of lignosulfonate products from S. viridosporus cultures. This population was (i) unable to degrade lignosulfonate products, and (ii) decreased the lignosulfonate degradation capacity of S. viridosporus . Antagonistic effects of the mixed population on S. viridosporus were observed. In the light of this, bioaugmentation strategies involving addition of S. viridosporus are unlikely to be successful and alternative degradation strategies need to be developed.

Harald Brelid - One of the best experts on this subject based on the ideXlab platform.

  • 1,2,3,4-Butanetetracarboxylic Acid Cross-Linked Softwood Kraft Pulp Fibers for Use in Fluff Pulp Applications
    Journal of Engineered Fibers and Fabrics, 2014
    Co-Authors: Kristoffer Lund, Harald Brelid
    Abstract:

    Cross-linked Fluff Pulp fibers for use in, for example, acquisition layers in absorption products can be found in the patent literature. Cross-linking improves properties such as the wet resilience of Fluff Pulp fiber networks. Among the more commonly seen cross-linkers are polycarboxylic acids, such as 1,2,3,4-butanetetracarboxylic acid (BTCA). These acids form ester bonds with the hydroxyl groups in the fiber wall. In this study, softwood kraft Pulp fibers were cross-linked with BTCA. The swelling behavior of the fibers and properties related to acquisition in absorption products were studied. It was found that the water retention value (WRV) decreased as a consequence of the introduced crosslinker. After deprotonization of a large part of the introduced carboxylic acids, the WRV increased, but the cross-linker was still able to limit significant swelling of the fiber wall. The wet bulk under load of fiber networks, composed of cross-linked fibers, generally increased with a decrease in WRV. Furthermore, it was found that the property development obtained after a cross-linking reaction with BTCA may be predicted by introducing a relative reaction intensity, RIrel, that takes into account both time and temperature in the curing step. This shows that the time and temperature in the curing step are interchangeable.

  • Alkali Extraction of Kraft Pulp Fibers: Influence on Fiber and Fluff Pulp Properties
    Journal of Engineered Fibers and Fabrics, 2012
    Co-Authors: Kristoffer Lund, Karin Sjöström, Harald Brelid
    Abstract:

    The importance of hemicelluloses for the papermaking properties of Pulp fibers is well documented. In the patent literature, it can be seen that there is also an interest in this type of modification of Pulp fibers for use in absorption products. In this study, a Scandinavian softwood kraft Pulp and a birch kraft Pulp were alkali extracted at 3 different concentrations of NaOH (2%, 4% and 8% NaOH in the suspension). The alkali extraction removed a large part of the hemicelluloses from the Pulp fibers and decreased the content of the charged groups. After extraction, the Pulps were dried in the form of sheets (approx. 600 g/m(2)). The alkali extracted Pulp fibers exhibited a greater decrease in swelling when re-wetted than untreated Pulp. A significant increase in the curl index after extraction with 4% and 8% NaOH was also noted. The tensile strength index of the formed sheets increased at the lowest concentration of NaOH and, at the higher concentrations, a decrease was observed. The Pulp sheets were dry defibrated at different defibration intensities and the performance of the resulting Pulps in Fluff Pulp applications was studied. The air-laid fiber networks of softwood Pulp fibers showed higher network strength than the networks of birch Pulps. The birch Pulp extracted at the highest alkali level tended to give the highest network strength. The results from the network strength tests also indicated that the increased curl of the fibers from the softwood Pulp extracted at the highest alkali level rendered a more flexible fiber network. In water absorption tests, the alkali treated softwood fibers tended to give networks with a somewhat enhanced water holding capacity under pressure.