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Chemical Technology in the Pre-Treatment Processes of Textiles,9780444500601
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Chemical Technology in the Pre-Treatment Processes of Textiles


Author(s): Karmakar
ISBN10:  044450060X
ISBN13:  9780444500601
Format:  Hardcover
Pub. Date:  11/2/1999
Publisher(s): Elsevier Science & Technology

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SummaryTable of Contents
Textile chemical processing today, particularly the pre-treatment processes require a highly sophisticated technology and engineering to achieve the well known concepts of "Right first time, Right everytime and Right on time" processing and production. Chemical pre-treatment may be broadly defined as a procedure mainly concerned with the removal of natural as well as added impurities in fabric to a level necessary for good whiteness and absorbency by utilising minimum time, energy and chemicals as well as water.

This book discusses the fundamental aspects of chemistry, chemical technology and machineries involved in the various pre-treatment process of textiles before subsequent dyeing, printing and finishing. With the introduction of newer fibres, specialty chemicals, improved technology and sophisticated machineries developed during the last decade, this book fills a gap in this area of technology. However, its real strength is its clear perception of ample background description, which will enable readers to understand most current journals, thus staying abreast of the latest advances in the field.

Preface v
Kinds of fibres
1(48)
Introduction
1(1)
Classification of fibres
1(2)
Chemical composition, morphology and structure of cotton
3(5)
Cotton impurities
5(3)
Natural protein fibres
8(8)
Molecular structure of wool fibres
8(5)
Impurities in raw wool
13(1)
Morphology and chemical structure of silk
14(2)
Long vegetable fibres
16(6)
Flax(linen)
17(1)
Remie
18(1)
Hemp
19(1)
Jute
19(3)
Regenerated natural fibres
22(5)
Cuprammonium rayon
22(1)
Viscose rayon
22(3)
Acetate fibres
25(1)
Regenerated protein fibres
26(1)
Synthetic fibres
27(11)
Polyester
27(2)
Nylon
29(5)
Acrylic fibres
34(3)
Olefin fibres
37(1)
Miscellaneous synthetic fibres
38(6)
Chlorofibres
39(1)
Poly(vinyl alcohol) fibres
39(1)
Elastomeric fibres
40(1)
Carbon fibres
41(1)
PTO fibres (Enkatherm)
42(1)
Other synthetic fibres
42(2)
References
44(5)
Preparation before chemical processes
49(20)
Introduction
49(1)
Inspection
49(2)
Sewing
51(1)
Mechanical cleaning of fabrics
52(3)
Brushing
52(1)
Cropping and shearing
52(3)
Singeing
55(10)
Singeing different kinds of fibres fabrics
56(1)
Plate singeing machine
57(1)
Rotary cylinder machine
58(1)
Gas singeing machine
58(5)
Singeing circular knit fabrics
63(2)
Process sequence
65(4)
Cotton fabric on kier
65(1)
Cotton fabric on J-Box
66(1)
Cotton fabric on pad-roll/thermoreaction chamber (T.R.C.)
66(1)
Cotton fabric on Jumbo jigger
66(1)
Knitted cotton goods
66(1)
Woollen fabrics
67(1)
Silk fabrics
67(1)
Polyester fabrics
67(1)
Nylon fabrics
67(1)
Polyester/cotton blends
67(1)
Polyester/viscose blends
68(1)
Polyester/wool blends
68(1)
Diacetate/viscose blends
68(1)
Desizing
69(17)
Introduction
69(2)
Methods of desizing
71(6)
Rot steeping
72(1)
Acid desizing
72(1)
Enzymatic desizing
72(3)
Desizing with oxidising agents
75(2)
Desizing of synthetic fabrics and their blends
77(2)
Desizing machineries
79(5)
References
84(2)
Scouring
86(46)
Introduction
86(1)
Mechanism of removal of impurities
87(2)
Scouring of cotton in alkaline agents
89(5)
The lime-soda boil
89(1)
The caustic soda boil
89(1)
The soda-ash boil
90(1)
The mixture of caustic soda and soda-ash boil
90(1)
The soap/detergent-soda-ash boil
90(1)
Sequestering agents
91(2)
Builders
93(1)
Fibre protecting reducing agents
94(1)
Mild oxidising agents
94(1)
Water insoluble solvents
94(1)
Surfactants
94(12)
Anionic surfactants
95(1)
Cationic surfactants
96(1)
Non-ionic surfactants
97(1)
Amphoteric surfactants
98(1)
Blends of surfactants
99(1)
Surfactants as wetting agent
99(2)
Surfactants as detergent (scouring agent)
101(2)
Emulsion scouring
103(3)
Solvent scouring
106(1)
Scouring of raw wool
107(2)
Emulsion scouring
108(1)
Suint scouring
109(1)
Solvent extraction scouring
109(1)
Refrigeration process
109(1)
Scouring wool yam and fabric
109(4)
Setting and scouring of wool yarn
109(1)
Crabbing (setting) of woollen fabric
110(1)
Potting of woollen fabric
110(3)
Scouring of wool fabric
113(1)
Carbonising of wool
113(1)
Degumming of silk
114(4)
Degumming in water
116(1)
Degumming with alkali and acid
116(1)
Degumming with soap
116(1)
Degumming with synthetic detergents
116(1)
Enzymatic degumming
117(1)
Foam degumming
117(1)
Partial degumming
117(1)
Washing of degummed silk
118(1)
Degumming of remie
118(1)
Scouring of linen
119(1)
Scouring of jute
120(1)
Scouring of synthetic-polymer fibres
120(5)
Polyester
121(1)
Nylon
121(1)
Polyacrylonitrile fibres
122(1)
Acetate fibres
123(1)
Regenerated cellulose
123(1)
Texturised fabrics
123(2)
Scouring of blended fibre fabrics
125(4)
Polyster/cotton
125(1)
Polyester/wool
126
Polyester/acrylic
122(5)
Acrylic/wool
127(1)
Acrylic/cellulosics
127(1)
Acetate/wool
128(1)
Blends containing viscose
128(1)
Polyester/silk
129(1)
Blends containing casein
129(1)
References
129(3)
Scouring machineries
132(28)
Introduction
132(1)
Batch type (rope) scouring machines
132(3)
Low pressure kier
132(1)
High pressure kier
133(1)
Jafferson-Walker's kier
134(1)
Gebauer kier
135(1)
Batch type (open-width) scouring machines
135(3)
Mather and Platt horizontal kier
135(1)
Jackson kier
136(1)
Jig process
137(1)
Semi-continuous scouring machines
138(1)
Padd-roll system
138(1)
Padd-steam-roll system
138(1)
Padd-roll on perforated cylinder
138(1)
Continuous scouring machines
138(7)
Saturator J-Box-rope washer
138(1)
Open-width roller steamer
139(1)
Batch or re-batching system
139(1)
Vaporloc system
140(1)
High pressure Klienewefer roller steamer
141(1)
Conveyer storage steamer system
142(1)
Roller-bed steamer with pre-swelling time
142(1)
Continuous relaxing/scouring machines
142(2)
Solvent scouring machines
144(1)
Wool scouring machines
145(11)
Raw wool scouring machines
145(2)
Wool hank scouring machines
147(1)
Wool fabric scouring machines
147(3)
Carbonising range for woollen fabric
150(2)
Crabbing and decatising machines
152(4)
Silk degumming machines
156(2)
Yarn degumming machines
156(1)
Piece goods degumming machines
156(2)
References
158(2)
Bleaching of textiles
160(57)
Introduction
160(1)
Bleaching with hypochlorites
161(7)
Calcium hypochlorite (bleaching powder)
161(1)
Sodium hypochlorite
162(1)
Lithium hypochlorite and chlorinated trisodium phosphate
163(1)
Factors effecting hypochlorite bleaching operations
164(2)
Accelerated hypochlorite bleaching
166(1)
Advantages of hypochlorite bleaching over bleaching powder
167(1)
Disadvantages of sodium hypochlorite bleaching over bleaching powder
168(1)
Bleaching with peroxides
168(5)
Mechanism of peroxide bleaching
170(1)
Stabilisers for peroxide bleaching
170(2)
Parameters in peroxide bleaching operations
172(1)
Bleaching of wool with hydrogen peroxide
173(5)
In alkaline hydrogen peroxide
174(1)
In acidic hydrogen peroxide
174(1)
Alkaline peroxide followed by hydrosulphite treatment
175(1)
Mordanting and peroxide bleaching
175(1)
Sequential oxidative and reductive bleaching
176(2)
In emulsion of hydrogen peroxide
178(1)
Bleaching of silk with hydrogen peroxide
178(2)
Bleaching of synthetic fibres with peroxide
180(1)
Regenerated cellulose
180(1)
Acetate fibres
180(1)
Acrylic fibres
180(1)
Advantages and disadvantages of peroxide over hypochlorite bleaching
181(1)
Bleaching with sodium chlorite
182(6)
Mechanism of bleaching
182(1)
Bleaching of cotton
183(1)
Bleaching of polyester
184(1)
Bleaching of nylon
184(1)
Bleaching of acetate fibres
185(1)
Bleaching of polyacrylonitrile
185(1)
Bleaching of polyvinyl alcohol
186(1)
Problem of corrosion and its prevention
186(1)
Merits and demerits of chlorite bleaching
187(1)
Bleaching with peracetic acid
188(4)
Cotton
190(1)
Nylon
190(1)
Cellulose acetate
191(1)
Acrylics
191(1)
Merits and demerits
191(1)
Reductive bleaching of wool
192(2)
Sulphur dioxide
192(1)
Sodium bisulphite
193(1)
Sodium hydrosulphite
193(1)
Thio-urea bleaching of wool
194(1)
Photo-bleaching of wool
194(1)
Bleaching of silk with reducing agents
194(1)
Reductive bleaching of nylon
195(1)
Peroxygen bleaching compounds
196(1)
Bleaching of jute
196(13)
Hypochlorite
197(1)
Hydrogen peroxide
197(1)
Sodium chlorite
198(1)
Peracetic acid
198(1)
Drawbacks in bleaching of jute
199(1)
Causes of yellowing and improvement of photostability of bleached jute
199(2)
Bleaching of linen
201(2)
Bleaching of blended fabrics
203(1)
Polyester/cotton
203(3)
Polyester/wool
206(1)
Nylon/cellulose
206(1)
Nylon/wool
207(1)
Acrylic/cellulose
207(1)
Acrylic/wool
208(1)
Acetate/cellulose
208(1)
Polyester/linen
208(1)
Wool/viscose
209(1)
Viscose/cotton
209(1)
Bleaching of cotton weft knitted fabrics
209(2)
References
211(6)
Bleaching and washing equipment
217(42)
Introduction
217(1)
Batch bleaching process machineries
217(5)
Semi-continuous bleaching process machineries
222(2)
Continuous bleaching by J-Box systems
224(6)
Continuous open-width bleaching equipment
230(10)
Steamers without plaited storage
232(1)
Conveyer steamer without pre-steeping zone
232(2)
Conveyer steamer with pre-steeping zone
234(2)
Pressureless or Combi-steamers
236(2)
Submerged bleaching systems
238(2)
Washing equipment
240(17)
Rope washing machines
241(6)
Open-width washing machines
247(10)
References
257(2)
Heat-setting
259(20)
Introduction
259(1)
Thermal behaviour of synthetic fibres
259(1)
Stages of heat-setting
260(1)
Methods of heat-setting
261(6)
Contact method
261(1)
Steam-setting method
261(1)
Hydro-setting method
262(1)
Heat-setting using tenter frame
263(3)
Selective infra-red emitters method
266(1)
Heat-setting conditions for different kinds of fibres
267(4)
Polyester fabrics
267(1)
Nylon fabrics
267(1)
Texturised fabrics
268(1)
Acrylic and modacrylic fabrics
269(1)
Cationic dyeable polyester
269(1)
Triacetate fibres
269(1)
Polyvinyl chloride fibres
270(1)
Elastomeric fibres
271(1)
Heat-setting of blended fibre fabrics
271(1)
Polyester/cotton
271(1)
Polyester/wool
271(1)
Polyester/linen
272(1)
Polyester/silk
272(1)
Polyvinyl chloride/cellulosics
272(1)
Effect of heat-setting on properties of synthetic fibres
272(5)
Structural changes
272(1)
Dimensional stability
273(2)
Stiffness
275(1)
Crease recovery
275(1)
Dyeahility
276(1)
References
277(2)
Mercerization
279(41)
Introduction
279(1)
Conditions for mercerization
279(9)
Changes in properties of cellulose on mercerization
288(2)
Swelling and shrinkage
281(4)
Structural modification
285(1)
Increased lustre
286(2)
Gain in strength
288(1)
Increased moisture absorption
288(1)
Increased dye absorption
289(1)
Increased reactivity
290(1)
Removal of immature cotton
290(1)
Physical compactness
290(1)
Mercerization of remie and flax fibres
290(1)
Mercerization of blended fibre fabrics
291(1)
Mercerizing machineries
292(14)
Cloth (woven) mercerizing machines
293(9)
Yarn mercerizing machines
302(1)
Knit goods mercerizing machines
303(3)
Hot mercerization
306(3)
Liquid ammonia mercerization
309(6)
References
315(5)
Optical brightening agents
320(16)
Introduction
320(1)
Chemical constitution of optical brighteners
321(2)
Mechanism of fluorescent whitening
323(1)
Factors influencing the functions of optical whiteners
323(2)
Substrate
324(1)
Saturation
324(1)
Method of application
324(1)
Time
324(1)
Temperature
324(1)
pH
325(1)
Salt
325(1)
Application of optical brighteners
325(9)
Cellulose fabrics
326(1)
Woollen fabrics
327(1)
Silk fabrics
328(1)
Polyester
328(1)
Nylon
329(1)
Polyacrylonitrile
330(1)
Cationic dyeable polyester
331
Polyvinyl chloride
322(10)
Other synthetic polymers and plastics
332(1)
Blended fibre fabrics
332(2)
References
334(2)
Combined pre-treatment processes of textiles
336(8)
Introduction
336(1)
Combined scouring and desizing
336(1)
Combined scouring and bleaching
337(2)
Combined desizing, scouring and bleaching
339(3)
References
342(2)
Degradation of fibres associated with chemical pre-treatment processes
344(16)
Introduction
344(1)
Degradation of cotton during desizing
344(2)
Degradation of cotton during scouring
346(4)
Degradation of cotton during bleaching
350(4)
Hypochlorite bleaching and damage
350(3)
Peroxide bleaching and damage
353(1)
Damage of wool during pre-treatment processes
354(2)
Damage of silk during pre-treatment processes
356(1)
Damage of polyester during pre-treatment processes
357(1)
References
357(3)
Conservation of energy and water, economy and effluent control in pre-treatment processes
360(35)
Water consumption in textile industry
360(1)
Impurities in water
361(2)
Water purification
363(1)
Soda-alum process
363(1)
Lime-soda process
363(1)
Base exchange process
364(1)
Economy through energy conservation
364(3)
Efficient generation of energy and minimum consumption
365(1)
Mechanical removal of water before drying
365(1)
Increased efficiency of drying and heat-setting
365(1)
Reduced liquor to material ratio
366(1)
Efficient heat recovery
366(1)
Heat recovery from process effluents
367(1)
Economy through water conservation
367(1)
Minimising liquor to material ratio
367(1)
Minimising wash liquor
367(1)
Re-using rinsing bath water
367(1)
Direct steam injection
368(1)
Economy through process modification
368(2)
Vaporloc bleaching
368(1)
J-Box bleaching
368(1)
Solvent scouring
368(1)
Cold bleaching
369(1)
Combined processing
369(1)
Shortening of process sequence
369(1)
Pollution aspects in pre-treatment processes of textiles
370(4)
Water and air pollution
370(2)
Parameters for assessment of harmful material; in waste water
372(2)
Pollution load and pre-treatment processes
374(6)
Desizing effluents
376(1)
Scouring effluents
377(1)
Bleaching effluents
378(1)
Auxiliary effluents
379(1)
Waste water treatment from pre-treatment plants
380(10)
Protective measures for ultra-violet radiation
390(1)
References
391(4)
Pre-treatment of textiles under plasma conditions
395(23)
Introduction
395(1)
The concept of plasma
395(2)
Corona discharge
396(1)
Glow-discharge
396(1)
Generation of plasma and its action
397(10)
Machine performance for producing plasma
398(6)
The interaction of plasma with substrate
404(3)
Surface modification of fabrics under plasma treatment
407(5)
Plasma treatment of wool
407(3)
Plasma treatment of other fabrics
410(2)
High energy radiation of textiles
412(2)
References
414(4)
Application of bio-technology in the pre-treatment processes of textiles
418(23)
Introduction
418(1)
Enzymes for textile application
418(7)
The chemistry of enzymes
418(2)
Mechanism of enzyme action on cotton
420(2)
Parameters governing the cellulase treatments
422(1)
Structural and morphological changes of fibres by enzymatic hydrolysis
423(1)
The use and advantages of enzymatic processing
424(1)
Treatment of cotton with enzymes
425(7)
Enzymatic desizing of cotton and silk
426(1)
Use of enzymes in mercerization
426(1)
Enzymatic scouring and bleaching processes
426(2)
Bio-polishing
428(3)
Effect of cellulase treatment in washing processes
431(1)
Stone washing
431(1)
Treatment of protein fibres with enzyme
432(3)
Wool carbonising
433(1)
Wool bleaching
433(1)
Shrink-proofing and modification of wool
434(1)
Bio-technology and effluent treatment
435(1)
References
436(5)
Analysis and testing in preparatory processes
441(33)
Introduction
441(1)
Analysis of water
441(2)
Suspended matter
442(1)
Total soluble salts
442(1)
Total hardness
442(1)
Calcium hardness
443(1)
Magnesium hardness
443(1)
Temporary and permanent hardness
443(1)
Analysis of non-cellulosic residues
443(2)
Ash content (mineral matter)
443(1)
Silicate and phosphate
444(1)
Calcium and magnesium
444(1)
Iron and copper
445(1)
Evaluation of wax content in cotton
445(1)
Evaluation of lubricants
446(1)
Total fatty matter
446(1)
Saponification value of an oil
447(1)
Unsaponification matter
447(1)
Determination of moisture content
447(1)
Tests and analyses of sizes
448(4)
Identification of sizes
449(2)
Percentage size by ordinary method
451(1)
Total size by Soxhlet method
451(1)
Total size by enzyme method
451(1)
Determination of the efficiency of scouring
452(1)
Measurement of weight loss
452(1)
Measurement of residual wax content
452(1)
Practical test of absorbancy
452(1)
Removal of motes (kitties)
453(1)
Testing and evaluation of bleaching agents
453(5)
Bleaching powder
455(1)
Sodium hypochlorite
456(1)
Sodium chlorite
456(1)
Hydrogen peroxide
456(1)
Stabilisers for peroxide bleach
457(1)
Sodium hydrosulphite
457(1)
Sodium bisulphite
457(1)
Sodium silicate
458(1)
Assessment of damage of cellulose
458(5)
Determination of fluidity
458(2)
Determination of Copper Number
460(1)
Methylene Blue absorption test
461(1)
Silver nitrate test
462(1)
Determination of acidic groups by iodometric method
462(1)
Assessment of damage of wool
463(1)
Microscopic test
463(1)
Swelling test
463(1)
Solubility test
463(1)
Spectrophotometric test
464(1)
Determination of degree of mercerization
464(4)
Deconvolution count
464(1)
Swelling index
465(1)
Benzopurpurine test
465(1)
Sodium hydroxide spotting test
465(1)
Goldthwait red-green test
466(1)
Staining test
466(1)
Barium activity number
466(1)
Determination of lustre
467(1)
X-ray analysis
467(1)
Infra-red analysis
468(1)
Evaluation of whitening efficiency of optical brighteners
468(1)
Visual assessment
468(1)
Extraction method
468(1)
Instrumental analysis
469(1)
Determination of degree of heat-setting
469(1)
Shrinkage test
469(1)
Crease recovery angle
469(1)
Assessment of handle
469(1)
Iodine absorption method
470(1)
Determination of biodegradability of surfactants
470(2)
Methylene Blue method
471(1)
References
472(2)
Subject index 474

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