scholarly journals An Eco-Friendly Approach Towards Bleaching Process for Whitening of Kydia calycina Fibres Instead of Hydrogen Peroxide

2016 ◽  
Vol 11 (3) ◽  
pp. 883-891
Author(s):  
Tayyaba Fatma ◽  
Shahnaz Jahan
Keyword(s):  
Hydrogen Peroxide ◽  
Weight Loss ◽  
Sodium Hydroxide ◽  
Fibre Length ◽  
Sodium Perborate ◽  
Bleaching Process ◽  
Whiteness Index ◽  
Pectinase Enzyme

This study was conducted to sustain the eco-friendly approach for bleaching of Kydia calycina fibres. The Kydia calycina fibres were extracted from the young shoots of Kydia calycina plant through water retting and then the extracted fibres were scoured with pectinase enzyme. After that, the scoured Kydia calycina fibres were bleached with three different methods. Among them, the best bleaching method was selected on the basis of tenacity, elongation, fineness, fibre length, weight loss and whiteness index. The concentration of sodium perborate, concentration of TAED, time and temperature of selected bleaching method were optimised using SAS software. At optimisation stage, tenacity, elongation, fineness and whiteness index of bleached fibres were tested. The results indicated that TAED activated sodium perborate showed better tenacity (3.81 g/d), elongation (2.09 %), fineness (22.92 denier) and maximum whiteness index (68.67) at optimised variables including concentration of sodium hydroxide (5 g/l), concentration of TAED (3 g/l), time (60 min) and temperature (500 C).

scholarly journals Effect of Scouring and Bleaching Agents on whiteness Index and Bursting Strength of Cotton Knitted Fabric

2019 ◽  
pp. 23-28
Author(s):  
MD. Tofazzal Hossain ◽  
Alimran Hossain ◽  
Palash Kumar Saha ◽  
MD. Zahangir Alam
Keyword(s):  
Hydrogen Peroxide ◽  
Caustic Soda ◽  
Sodium Hypochlorite ◽  
Knitted Fabric ◽  
Bleaching Agent ◽  
Calcium Hypochlorite ◽  
Bleaching Process ◽  
Whiteness Index ◽  
Bursting Strength ◽  
Cotton Knitted Fabric

This paper shows the effect of different bleaching agent on whiteness index and bursting strength of the cotton knitted fabric. Bleaching process uses three types of bleaching agents namely hydrogen peroxide (H2O2), sodium hypochlorite (NaOCl) and calcium hypochlorite Ca(OCl)2 with varying their concentration and these are 1.5 g/l, 2.5 g/l, 3.5 g/l, 4.5 g/l, and 5.5 g/l. In the same time, scouring agent was caustic soda, and its concentration for all the bleaching agents was same. It is obvious that with the increase of bleaching agent concentration, whiteness index increases, and bursting strength reduces.

Valorization of Seaweed: Using Brown Algae Waste in Papermaking

2021 ◽  
Author(s):  
Ana Moral ◽  
Roberto Aguado ◽  
Jose Amaya ◽  
Antonio Tijero ◽  
Menta Ballesteros
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Sodium Hypochlorite ◽  
Brown Seaweed ◽  
Primary Source ◽  
Sodium Perborate ◽  
Lipophilic Compounds ◽  
Dictyota Dichotoma ◽  
Reinforcing Material ◽  
Loss Of Strength

Abstract In this work, the brown alga Dictyota dichotoma was explored as a new reinforcing material for papermaking. Performing the typical chemical tests for cellulosic substrates on D. dichotoma evidenced large amounts of ethanol:benzene extractable substances (7.2%) and ashes, algae-specific results. Also, even if lipophilic compounds are removed, brown seaweed are not a primary source of fibers because it contains low proportion of cellulose. However, its elevated content of insoluble carbohydrates (51.4%) suggest there is some potential in association with conventional cellulosic pulps, as fibrous elements contribute to sheet forming and other components fill the spaces in the paper web without noteworthy loss of strength. Extraction was carried out with clean processes: hydrogen peroxide and mixtures (hydrogen peroxide-hydrochloric acid and hydrogen peroxide-sodium perborate), sodium hydroxide and sodium hypochlorite, always aiming for low reagent concentrations, in the range of 1-12%. The results show that sodium hydroxide and sodium hypochlorite were the treatments that lead to paper sheets with better structural and mechanical properties without further bleaching or refining, thus highlighting the suitability of these algae for papermaking applications.

scholarly journals Preparation of Paper Mulberry Fibers and Possibility of Cotton/Paper Mulberry Yarns Production

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Manoon Jitjaicham ◽  
Boonsri Kusuktham
Keyword(s):  
Hydrogen Peroxide ◽  
Optimum Condition ◽  
Nonionic Surfactant ◽  
Sodium Hydroxide ◽  
Cotton Fibers ◽  
Antifungal Property ◽  
Bleaching Process ◽  
Inner Bark ◽  
Yarn Production

The novelty of yarn production from cotton/paper mulberry fiber blends was reported. The objective of this research was to prepare the paper mulberry fibers and study the possibility of production of yarns from cotton/paper mulberry fibers. For preparation of paper mulberry fibers, the inner bark was first immersed in water for 24 h. Then, the fibers were treated with sodium hydroxide at concentration of 5–10% (w/v) for 1–3 h. After that, the bleaching process was conducted with hydrogen peroxide at concentration of 5–25% (v/v) for different temperature and time. Finally, the fibers were washed with 10% (v/v) of nonionic surfactant at temperature of 90°C for 30 minute to remove the residual gum from the fibers. The results showed that optimum condition for scouring of the paper mulberry fibers was 15% (w/v) sodium hydroxide at 90°C for 2 h. The bleaching process with 15% (v/v) H2O2 at 90°C for 90 minute was suitable. The obtained fibers were blended with the cotton fibers to produce yarns by open-end spinning method. The % elongation and tenacity of the blended yarns increased with the increasing of the paper mulberry ratio. Also, the antifungal property of yarns was improved by the blending of cotton fibers with the paper mulberry fibers.

Bleaching optimization at WestRock mill in Covington, Virginia

TAPPI Journal ◽  
2016 ◽  
Vol 15 (9) ◽  
pp. 581-586 ◽  
Author(s):  
RICARDO B. SANTOS ◽  
PETER W. HART ◽  
DOUGLAS C. PRYKE ◽  
JOHN VANDERHEIDE
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Hydroxide ◽  
Chlorine Dioxide ◽  
Capital Expenditures ◽  
Equipment Repair ◽  
Optimization Program ◽  
Hardwood Pulp ◽  
Improved Performance

The WestRock mill in Covington, VA, USA, initiated a long term diagnostic and optimization program for all three of its bleaching lines. Benchmarking studies were used to help identify optimization opportunities. Capital expenditures for mixing improvement, filtrate changes, equipment repair, other equipment changes, and species changes were outside the scope of this work. This focus of this paper is the B line, producing southern hardwood pulp in a D(EP)DD sequence at 88% GE brightness. The benchmarking study and optimization work identified the following opportunities for improved performance: nonoptimal addition of caustic and hydrogen peroxide to the (EP) stage, carryover of D0 filtrate to the (EP) stage, and carryover of (EP) filtrate to the D1 stage. As a result of actions the mill undertook to address these opportunities, D0 kappa factor decreased about 5%, sodium hydroxide consumption in the (EP) stage decreased about 35%, chlorine dioxide consumption in the D1 stage decreased about 25%, and overall bleaching cost decreased about 15%.

Production of monosaccharides from poplar by a two-step hydrogen peroxide-acetic acid and sodium hydroxide pretreatment

2021 ◽  
Vol 170 ◽  
pp. 113820
Author(s):  
Hong Liao ◽  
Jiaxin You ◽  
Peiyao Wen ◽  
Wenjun Ying ◽  
Qianqian Yang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Acetic Acid ◽  
Sodium Hydroxide

scholarly journals Influence of the fluorescent brightener Periblanc BA on the degree of whiteness of the knitted cotton fabric

2011 ◽  
Vol 65 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Milena Miljkovic ◽  
Milovan Purenovic ◽  
Mile Novakovic ◽  
Sonja Randjelovic
Keyword(s):  
Hydrogen Peroxide ◽  
Cotton Fabric ◽  
Whiteness Index ◽  
Fluorescent Brightener ◽  
Single Bath ◽  
Optical Bleaching ◽  
The One ◽  
Experimental Runs ◽  
Exhaustion Method

In this study the influence of the different fluorescent brightener Periblanc BA concentrations on the degree of knitted cotton fabric whiteness was investigated. Two consecutive experimental runs were performed. The first was the bleaching of the knitted cotton fabric with hydrogen peroxide using the methods of two and single bath exhaustion while the second was the optical bleaching with fluorescent brightener Periblanc BA using the exhaustion method. CIE Whiteness Index and Tint value were measured on the Color-Eye 3000 spectrophotometer at the standard illuminant D65 (Ice-Texicon, d/8, D65/10?) while K/S values were determined using the Kubelka Munk equation. The results show that cotton fabric bleached with fluorescent brightener Periblanc BA after bleaching with hydrogen peroxide using two bath exhaustion method has higher degree of whiteness (118.8) with a reddish tint in comparison to the one bleached with hydrogen peroxide using single bath method (106.1).

scholarly journals Aferição do pH de diferentes agentes clareadores indicados para o clareamento intracoronário

2018 ◽  
Author(s):  
João Felipe Besegato ◽  
Gabriela Dos Santos Ribeiro Rocha ◽  
Marlene De Sousa Amorim ◽  
Fabio Martins Salomão ◽  
Daniel Poletto ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Statistical Analysis ◽  
Multiple Comparisons ◽  
The Other ◽  
Sodium Perborate ◽  
Distilled Water ◽  
Friedman Test ◽  
Time Intervals ◽  
Ph Values ◽  
Evaluation Time

Objective: to measure pH values of bleaching agents that are indicated to intracoronal bleaching technique in different time intervals. Methods: Each group (G) received five samples (n=5): G1 – distilled water (AD); G2 – hydrogen peroxide (H2O2) 30%; G3 – sodium perborate (PbS) + AD; G4 – PbS + H2O2 30%; G5 – sodium percarbonate (PcS) + AD; and G6 – PcS + H2O2 30%. pH values were stated using a digital pHmeter, in different time intervals: immediately after handling (T0), 24 hours (T1) and 168 hours after handling (T2). The results were submitted to statistical analysis through Kruskal-Wallis and Mann Whitney tests, in this order, allowing multiple comparisons among the groups. To verify the effect of time in each group, Friedman test was applied. Results: In the evaluation of the effect of time in each group, it was observed that G2 presented acid behavior, while the other groups exhibited values close to neutrality or alkaline. Conclusions: H2O2 30% was the only agent that showed acidic behavior in every evaluation time. Meanwhile, PcS + H2O had the highest pH values.

scholarly journals Bleaching Process Investigation of Tunisian Dromedary Hair

ISRN Textiles ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
T. Harizi ◽  
S. Dhouib ◽  
S. Msahli ◽  
F. Sakli
Keyword(s):  
Mechanical Properties ◽  
Hydrogen Peroxide ◽  
Adverse Effects ◽  
Oxalic Acid ◽  
Review Of The Literature ◽  
Bleaching Process ◽  
Bleaching Efficiency

Successful bleaching of pigmented fibres was, generally, evaluated by a maximum whiteness, a minimum yellowness, and less damage to the bleached fibers. A review of the literature reveals that many studies on pigmented fibre bleaching are concerned with improving the whiteness and mechanical properties of bleached fibres. In this study, we investigate the effects of the hydrogen peroxide concentration, bleaching time, and clarification bath on the bleaching efficiency of Tunisian dromedary hair. It was showed that 30 min bleaching time gives better result in term of whiteness. However, an increased bleaching time gives an excessive damage to the bleached fibers. Further, the damage incurred by the dromedary hair was more important than that for wool, as is shown by the tenacity results. We found that oxalic acid, which is used for rinsing dromedary hair (after bleaching), provides improved results in term of whiteness obtained with bleaching. Certainly, oxalic acid made it possible to remove the maximum of iron remaining on fibre after bleaching. Bleaching methods demonstrate the excessive damage incurred by the fibre when using hydrogen peroxide particularly with raise concentration. This damage leads to adverse effects on the tenacity fibre.

An in-vitro Comparison of the Bleaching Efficacy of 35 Percent Carbamide Peroxide with Established Intracoronal Bleaching Agents

2020 ◽  
Author(s):  
Nandita Bansal
Keyword(s):  
Hydrogen Peroxide ◽  
Sodium Perborate ◽  
Distilled Water ◽  
Carbamide Peroxide ◽  
Human Teeth ◽  
Anterior Teeth ◽  
Group I ◽  
Group Ii ◽  
Control Evaluation

Introduction: Intracoronal bleaching is the simplest, least invasive, and least expensive means available to lighten non-vital discolored teeth. The objective of the study: To evaluate the intra coronal bleaching efficacy of 35% Carbamide peroxide relative to 35% Hydrogen peroxide and Sodium perborate using artificially stained extracted human teeth. Materials and Methods: Eighty extracted human permanent maxillary and mandibular anterior teeth and single-rooted premolars were artificially stained using whole human blood and root canal treatment was completed. They were bleached twice 7 days apart using: Group I (n=20) – 35% Carbamide peroxide gel, Group II (n=20) – 35% Hydrogen peroxide gel, Group III (n=20) – 2 gm Sodium perborate mixed with per ml of distilled water, Group IV (n=20)– Distilled water only (control). Evaluation of shade was performed on day 0,7,14. Results: On day 7, In Groups I and Group II, there was a reduction in the shade by 2 vita tab positions, whereas Group IIIlightened by 1-tab position only. On day 14, CP and HP lightened by overall 3-tab positions and SP by 2-tab positions. There were no statistical differences between the groups on day 7 and day 14. Conclusion: 35% Carbamide peroxide, 35% Hydrogen peroxide and Sodiumperborate were equally effective for Intra coronal bleaching.

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