• ## Laccases to Improve the Whiteness in a Conventional

Laccases to Improve the Whiteness in a Conventional Bleaching of Cotton Tzanko Tzanov,1 Carlos Basto,1 Georg M Gu¨bitz,2 Artur CavacoPaulo*1 1Departamento de Engenharia Teˆxtil, Universidade do Minho, Campus de Azure´m, 4800058, Guimara˜es, Portugal Fax: þ351 253 ; Email: 2Graz University of Technology, Dept of Environmental Biotechnology,

• ## Laccases to Improve the Whiteness in a Conventional

In this case, a single bleaching step with H 2 O 2 (12 g L 1 ) 6 was carried out, and the whiteness index (WI) obtained using PTWB as bathwater was very similar 7 to the WI obtained for the

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• ## (PDF) Effect of Postbleaching Surface

Background: Commercial bleaching gels with remineralizing agents were developed to reduce the adverse effects of dental bleaching The present study evaluated the effects on teeth of inoffice

• ## Bleaching Agents, Pulp and Paper McDonough

Worldwide, more than ${50\times 10^{6}{\hskip0167em}{\hskip0167em}{\rm{t}}}$ of pulp is bleached annually, making the pulp and paper industry one of the largest consumers of bleaching chemicals The principal objective in bleaching any type of pulp is usually to increase the whiteness of the pulp, as measured by its brightness, which is defined as reflectance measured at a wavelength of 457

• ## Food Bleaching Agents Market Size, Share, Industry

The bleaching agent used in allpurpose flour processing results in whiter and finergrain flour with a softer texture The use of bleaching agents in flour will improve the color, brightness, and natural softness of the dough Chlorine is a highly effective yet inexpensive food

• ## Pulp bleaching enzymes promoting whiteness in

The SUN28 serie is dedicated to the pulp bleaching process, which improves the bleaching efficiency, promotes whiteness, and reduces the amount of bleaching chemicals Benefit 1 Improve pulp whiteness and inhibit yellowing 2 Improve bleaching efficiency, reduce the amount of chlorine bleach and reduce bleaching costs 3

• ## Effect of Optical Brightening Agent (OBA) on

significant Based on the curves shown in Figure 3, established regression equations presented in Table 3 were established, where whiteness is correlated with the pulp bleached brightness and the dosage of optical brightener applied As shown in Table 3, OBA can improve significantly the optical properties of pulps of 88%, 90% and 92% ISOWith 2 kg/t OBA (Tinopal EC (S) Liq) and a

• Author: Bianca Moreira Barbosa, Fernando Gomes, Jorge Colodette, Danila Carvalho, Mauro Manfredi
• ## Bleaching agents SlideShare

Hypochlorite bleaching (OCl) is the oldest industrial method of bleaching cotton Originally, calcium hypochlorite, Ca(OCl)2 was used Most cotton fabrics were bleached with sodium hypochlorite up until 1940 Today it accounts for only 10 % of the cotton bleaching agents

• ## Optimization of Bleaching Process

Bleaching clay base minerals Bentonite minerals have limited sorptive properties in the natural state and require chemical treatment by acids to create the surface area and porosity needed for bleaching vegetable oils Bleaching clays of this nature are commonly referred to as “acid” or “acidactivated” clays

• ## Susceptibility of Enamel Treated with Bleaching

The pH values of the bleaching agents used in our study were measured with a pH meter and determined approximately pH = ~8 for each group The pH values of bleaching materials were almost similar in this study, but the calcium losses of the groups were found to be different For this reason, we think that the pH values of the bleaching agents

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• ## Method of bleaching limestone Franklin Industries, Inc

This invention relates to a method of bleaching limestone, and more particularly to a method for removing small amounts of iron, usually in the form of iron oxide, from the limestone in order to improve the whiteness of the limestone Most limestone deposits contain small amounts of

• ## Purification Method of Kaolin Mineral Xinhai

Chemical bleaching: the impurities in kaolin mineral can be oxidized into soluble substances through bleaching, which can be washed and removed to improve the whiteness of kaolin products However, chemical bleaching is relatively expensive and is usually used in kaolin concentrate, which needs further purification after decontamination

• ## Laccases to Improve the Whiteness in a Conventional

In this case, a single bleaching step with H 2 O 2 (12 g L 1 ) 6 was carried out, and the whiteness index (WI) obtained using PTWB as bathwater was very similar 7 to the WI obtained for the

• ## Combinative Scouring, Bleaching, and Cationization

The bleaching process can effectively improve the whiteness Hydrogen peroxide is an environmentally safe bleaching agent for cotton fabrics However, bleaching of cottonbased fabrics with hydrogen peroxide requires an alkaline medium (normally NaOH), stabilizer, and either high temperatures or a long dwell time [ 17 , 18 ], which results in

• ## Combinative Scouring, Bleaching, and Cationization

In order to facilely achieve pretreatment and saltfree dyeing of greige knitted cotton fabrics, a combinative scouring, bleaching, and cationization pretreatment of the fabrics is designed in this study The fabrics are first treated in a bath containing commercial scouring and bleaching agents, and then glycidyltrimethylammonium chloride (GTA) is directly added into the bath to achieve

• ## Whiteness an overview | ScienceDirect Topics

Whiteness is recognised as a special colour attribute and much research has been conducted in order to define whiteness colourimetrically (Luo et al, 2005)The quantification of whiteness has long been of importance to a number of industries including paper, paint, plastic and laundry industries, and a number of whiteness indices have been developed to address their needs

• ## Papermaking Bleaching and washing | Britannica

Papermaking Papermaking Bleaching and washing: The use of calcium and sodium hypochlorites to bleach paper stock dates from the beginning of the 19th century In the early days of sulfite pulp manufacture, a singlestage treatment of pulp at low consistency, using calcium hypochlorite (chlorinated lime), satisfied most requirements This simple bleaching treatment, however, is not

• ## Developments in application of enzymes for textile

Actually the radical reactions involved in the action of bleaching agents with the fibers, lead to decrease in the degree of polymerization and thus severe damage to fibers (Basto et al, 2007) Furthermore, huge amounts of water are needed to remove hydrogen peroxide from fabrics which would cause problems in dyeing 431

• ## Smile Restoration through Use of Enamel

In this case, custom bleaching trays for the maxillary and mandibular arches were made from alginate impressions After initial fabrication, the trays were adapted to the patient's oral cavity Then the patient was instructed to place a small drop of the bleaching product (10% Whiteness Perfect, FGM) into each tooth well of the trays

• ## Susceptibility of Enamel Treated with Bleaching

The pH values of the bleaching agents used in our study were measured with a pH meter and determined approximately pH = ~8 for each group The pH values of bleaching materials were almost similar in this study, but the calcium losses of the groups were found to be different For this reason, we think that the pH values of the bleaching agents

• 位置: 8600 Rockville Pike, Bethesda, MD
• ## Effects of bleaching and functionalization of kaolinite

Effects of bleaching and functionalization of kaolinite on the mechanical and thermal properties of polyamide 6 nanocomposites Marya Raji, Abou el kacem Qaiss and Rachid Bouhfid * Moroccan Foundation for Advanced Science, Innovation and Research (MAScIR), Composites and Nanocomposites Center, Rue Mohamed Al Jazouli – Madinat Al Irfane, Rabat, 10100, Morocco

• ## Influence of Bleaching Regimen and Time Elapsed on

In the whiteness HP 35% group, a significant increase in the μTBS of the resinenamel composite was observed when compared with the other treatment groups 1 week after bleaching, and this can be attributed the presence of thickener (carbopol) in whiteness HP 35%, which might improve the adhesion and extend the release of active bleaching

• ## Common purification methods of kaolinThe NIle

Chemical bleaching: The impurities in kaolin can be oxidized into solubles by bleaching, and then washed and removed to improve the whiteness of kaolin products However, the cost of chemical bleaching is relatively high, and it is usually used for kaolin concentrate that needs to be further purified after impurity removal

• ## BioremediationWaste Water Treatment OMICS

Bleaching: This process eliminates the natural coloring matter that can’t be eliminated by rubbing in a purely chemical reaction The general objective of this stage is to improve the whiteness of the textile fabric, through redox reactions

• ## Papermaking Bleaching and washing | Britannica

Papermaking Papermaking Bleaching and washing: The use of calcium and sodium hypochlorites to bleach paper stock dates from the beginning of the 19th century In the early days of sulfite pulp manufacture, a singlestage treatment of pulp at low consistency, using calcium hypochlorite (chlorinated lime), satisfied most requirements This simple bleaching treatment, however, is not

• ## Imerys | Minerals | WhitChem

These minerals are mined from extensive, high quality, naturally occurring reserves and is processed to develop solutions that improve product performance and manufacturing efficiency in several industries Imery’s absolute commitment to quality ensures consistency and reliability across their products and services for an array of applications

• ## Developments in application of enzymes for textile

Actually the radical reactions involved in the action of bleaching agents with the fibers, lead to decrease in the degree of polymerization and thus severe damage to fibers (Basto et al, 2007) Furthermore, huge amounts of water are needed to remove hydrogen peroxide from fabrics which would cause problems in dyeing 431

• ## Smile Restoration through Use of Enamel

In this case, custom bleaching trays for the maxillary and mandibular arches were made from alginate impressions After initial fabrication, the trays were adapted to the patient's oral cavity Then the patient was instructed to place a small drop of the bleaching product (10% Whiteness Perfect, FGM) into each tooth well of the trays

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