Study on Effort of Ultrasonic Treatment on Water Retention Value of Pulp Fiber

2014 ◽  
Vol 1030-1032 ◽  
pp. 458-461
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Wen Cai Xu
Keyword(s):  
Ultrasonic Treatment ◽  
Processing Time ◽  
Water Retention ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Ultrasonic Power ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Absorbent Cotton ◽  
Coniferous Wood

Effects of ultrasonic processing conditions on water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber were discussed. Results showed that ultrasonic power and processing time have an significant impact on water retention value of three kinds of pulp, the effort of ultrasonic treatment temperature on water retention value of three kinds of pulp is less. The water retention value of bleaching coniferous wood pulp fibers, absorbent cotton pulp fiber and straw pulp fiber, respectively, reach the maximum at power of 300W, 500W, 400W, and processing time of 60min, 120min, 60min.

Preparation and Properties of Straw Pulp Fiber/Magnetic Nano-Composites

2013 ◽  
Vol 781-784 ◽  
pp. 2641-2644 ◽  
Author(s):  
Quan Xiao Liu ◽  
Yan Na Yin ◽  
Yu Bin Lyu
Keyword(s):  
Ultrasonic Treatment ◽  
Processing Time ◽  
Water Retention ◽  
Magnetic Particles ◽  
Pulp Fiber ◽  
Ultrasonic Power ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Fiber Cells ◽  
Treatment Conditions

Effects of ultrasonic treatment on water-retention value of straw pulp fibers were discussed and the ultrasonic treatment conditions were optimized. The best conditions of ultrasonic treatment as follows: ultrasonic power is 400W, processing time is 90min and temperature is 40°C. SEM shows that a large number of magnetic particles were left inside the pulp fiber cells. Automated Surface Area & Pore Size Analyzer shows a good superparamagnetic behavior.

Study on Mercerization Orthogonal Experiment of Coniferous Wood Pulp Fiber

2014 ◽  
Vol 1030-1032 ◽  
pp. 454-457
Author(s):  
Quan Xiao Liu ◽  
Dan Xi Li ◽  
Wen Cai Xu
Keyword(s):  
Water Retention ◽  
Orthogonal Experiment ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Treatment Conditions ◽  
Fiber Cell Wall ◽  
Coniferous Wood ◽  
Wood Pulp Fiber

Effects of mercerizing treatment on water-retention value of bleaching coniferous wood pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 7mol/L, temperature of 40°C and processing time of 100min. SEM showed that the fiber cell wall swelling increase after mercerization.

Mercerization and Characterization of Straw Pulp Fibers

2013 ◽  
Vol 781-784 ◽  
pp. 2645-2649
Author(s):  
Yan Na Yin ◽  
Quan Xiao Liu ◽  
Yu Bin Lyu
Keyword(s):  
Cell Wall ◽  
Processing Time ◽  
Water Retention ◽  
Fiber Cell ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Treatment Conditions ◽  
Fiber Cell Wall

Effects of mercerizing treatment on water-retention value of straw pulp fibers were discussed and the mercerizing treatment conditions were optimized. The best conditions of mercerizing treatment is NaOH concentration of 4mol/L, temperature of 40°C and processing time of 60min. SEM showed that the fiber cell wall swelling increase after mercerization.

scholarly journals Assessing wood pulp reactivity through its rheological behavior under dissolution

Cellulose ◽  
2019 ◽  
Vol 26 (18) ◽  
pp. 9877-9888
Author(s):  
Sara Ceccherini ◽  
Thad Maloney
Keyword(s):  
Molecular Weight ◽  
Water Retention ◽  
Wood Pulp ◽  
Degree Of Polymerization ◽  
Cellulose Dissolution ◽  
Water Retention Value ◽  
Cellulosic Fibers ◽  
Measurement Protocol ◽  
Convenient Approach ◽  
Viscose Process

Abstract Recent years have witnessed an increasing interest in man-made cellulosic fibers, whose production generally requires cellulose dissolution and regeneration. Cellulosic fibers are difficult to dissolve. Thus, the recalcitrance of wood pulp can be an estimate of its reactivity. Pulp reactivity is usually assessed via complex and time-consuming laboratory simulations of the viscose process. This study proposes a faster and more convenient approach. The dissolution-based torque reactivity (DTR) test measures the evolution of the rheological properties of a pulp suspension under dissolution in cupriethylenediamine. Reactivity is quantified in terms of initial dissolution rates (IDR) and dissolution times (DT). This study describes the measurement protocol for the DTR test and its application to some commercial pulps and a series of pulps hornified to different extents. The IDR and DT values were compared with other pulp features, including degree of polymerization, molecular weight distribution, specific surface area and water retention value. The DTR test proved to be reasonably precise and fast to carry out. Graphic abstract

Ultrasonic Treatment of Magnesium Alloy Melts and its Effects on Solidification Microstructures

2007 ◽  
Vol 546-549 ◽  
pp. 129-132 ◽  
Author(s):  
Zi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui
Keyword(s):  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Processing Time ◽  
Ultrasonic Processing ◽  
Ultrasonic Power ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment ◽  
Solidification Microstructures

The effects of high intensity ultrasonic melt treatment on the microstructure of magnesium alloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave and then cooled to a predetermined temperature. With the increase in ultrasonic power, the structure exhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, the grains tended to somewhat coarsened. And increasing the ultrasonic processing time led to a grain refinement of magnesium alloy.

Network swelling of TEMPO-oxidized nanocellulose

Holzforschung ◽  
2015 ◽  
Vol 69 (2) ◽  
pp. 207-213 ◽  
Author(s):  
Thad C. Maloney
Keyword(s):  
Differential Scanning Calorimetry ◽  
Water Retention ◽  
Nanofibrillated Cellulose ◽  
Pulp Fibers ◽  
Water Retention Value ◽  
Scanning Calorimetry ◽  
Feasible Method ◽  
Centrifugal Method ◽  
Solute Exclusion ◽  
Fiber Matrix

Abstract: This study examines the swelling of TEMPO-oxidized nanofibrillated cellulose (NFCTEMPO, shortly NFC) on both the particle and interparticle levels. The sum of the intraparticle and interparticle swelling is referred to as the network swelling. A centrifugal method, based on a modification of the water retention value test, was used to measure the network swelling of NFC, a pigment, and some pulp fibers. It was found that the network swelling of NFC is highly dependent on its concentration within a fiber matrix. The particle swelling of NFC and pulp fibers was analyzed by differential scanning calorimetry (DSC) and solute exclusion. The counterion for the NFC varied among the Na+, H+, and Ca2+ forms. The counterion has a very large effect on the particle and network swelling of NFC, with Ca2+ giving the lowest swelling and Na+ the highest swelling. An industrially feasible method for changing the counterion of NFC from the nominal Na+ to the Ca2+ form, and thus improving dewatering properties, is given.

Significant contribution of fibrils on pulp fiber surface to water retention value

2020 ◽  
Vol 35 (1) ◽  
pp. 96-105
Author(s):  
Minoru Kimura ◽  
Takashi Ishida ◽  
Yuko Ono ◽  
Miyuki Takeuchi ◽  
Akira Isogai
Keyword(s):  
Cell Walls ◽  
Kraft Pulp ◽  
Water Retention ◽  
Structural Changes ◽  
Significant Contribution ◽  
Fiber Surface ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Bleached Kraft Pulp ◽  
Two Factors

AbstractThe contribution of structural changes of softwood bleached kraft pulp (SBKP) fibers and partly dried SBKP handsheets to their water retention values (WRVs) was studied. Two factors related to mesopores and macropores, which were determined for super critical point (SCP)-dried SBKP sheet samples, should participate in the WRVs determined for wet SBKP sheet samples. The mesopores are formed during pulping/bleaching to remove lignin and a part of hemicelluloses that are present originally in wood cell walls. The combined volumes of mesopores and macropores (totally < ∼0.6 g g−1) in SBKP fibers after SCP drying were significantly lower than the entire WRV (∼1.6 g g−1) of the original never-dried SBKP. We hypothesize that external fibrils of SBKP fibers are formed during pulping, bleaching, washing, pressure-screening, and pressing processes at high and low solid contents in water under high shear forces. The WRV can be used as an indicator to evaluate such structural changes of external fibrils in pulp fibers and paper sheets during drying/wetting in papermaking process as well as in use under various conditions. In contrast, changes in mesopore and macropore volumes determined for SCP-dried sheets cannot properly detect such structural changes of external fibrils.

Effect of Ultrasonic Treatment on Microstructures of Mg-Ca Binary Alloy

2010 ◽  
Vol 139-141 ◽  
pp. 677-680
Author(s):  
Zhi Qiang Zhang ◽  
Qi Chi Le ◽  
Jian Zhong Cui
Keyword(s):  
Magnesium Alloy ◽  
Grain Refinement ◽  
Magnesium Alloys ◽  
Ultrasonic Treatment ◽  
High Intensity ◽  
Processing Time ◽  
Ultrasonic Processing ◽  
Ultrasonic Power ◽  
Melt Treatment ◽  
Ultrasonic Melt Treatment

The effects of high intensity ultrasonic melt treatment on the microstructure of magnesium alloys were investigated in this paper. Magnesium melts were treated with power ultrasonic wave and then cooled to a predetermined temperature. With the increase in ultrasonic power, the structure exhibited refined and spheroidzed crystal grains. After further increasing the ultrasonic power, the grains tended to somewhat coarsened. Increasing the ultrasonic processing time led to a grain refinement of magnesium alloy.

The correlation between the water retention values of fibers by the centrifugation method and maximum content of fiber bonding water by the headspace GC method

2019 ◽  
Vol 34 (3) ◽  
pp. 304-309 ◽  
Author(s):  
Ruo-Yun Wang ◽  
Wen-Xuan Mo ◽  
Xiao-Nin Shen ◽  
Bo Li ◽  
Xin-Sheng Chai
Keyword(s):  
Gas Chromatography ◽  
Water Retention ◽  
Headspace Gas Chromatography ◽  
Pulp Fibers ◽  
Excellent Correlation ◽  
Water Retention Value ◽  
Headspace Gas ◽  
Centrifugation Method ◽  
Maximum Content ◽  
Headspace Gc

Abstract This work conducted an investigation on the water retention value (WRV) of pulp fibers measured by the conventional centrifugation method (with a screen filter) and the maximum content of fiber bonding water (MCFBW) measured by a headspace gas chromatography (HS-GC), a method with no fine loss, developed recently. The results showed there is an excellent correlation ({R^{2}}=0.988) between these two methods. However, the WRVs measured by the centrifugation method are consistent lower than the MCFBWs from the HS-GC method and the absolute differences were significantly increases for the refined pulp fibers, i. e., about 50–70 compared to 30+ for the pulps without treatment. The information from this study provides the insight of the real WRVs of the pulps from different processes.

scholarly journals Effect of Oxidized Wood Pulp Fibers on the Performance of the Thermoplastic Corn Starch Composites

2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Peng Yin ◽  
Wen Zhou ◽  
Xin Dong ◽  
Bin Guo ◽  
Yanan Huang
Keyword(s):  
Corn Starch ◽  
Physical And Mechanical Properties ◽  
Thermoplastic Starch ◽  
Wood Pulp ◽  
Pulp Fiber ◽  
Pulp Fibers ◽  
Oxidation Degree ◽  
Water Contact ◽  
Elongation At Break ◽  
Wood Pulp Fiber

In this study, oxidized wood pulp fiber (OWPF) was prepared by oxidizing wood pulp fiber (WPF) with NaIO4, and OWPFs with different oxidation degrees were obtained and characterized by light microscope, XRD, and TG. Then, OWPFs with different oxidation degrees were incorporated into thermoplastic starch (TPS) to prepare OWPF/TPS composites. The cross-section morphology, water resistance, and physical and mechanical properties of the composites were investigated. SEM showed good dispersion of OWPF in the continuous TPS phase. The tensile strength of OWPF/TPS reached a maximum value of 5.02 MPa when the oxidation degree of OWPF was 0.5. Elongation at break of OWPF/TPS composites increased with the increasing oxidation degree of OWPF. Meanwhile, as a result of cross-linking, the water contact angle was also improved with the increased oxidation degree of OWPF. The study provided a new way to prepare a degradable TPS composite with satisfying properties to be used for packaging and catering.

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