Industry Overview
Polyester yarn dyeing is an important textile processing operation that involves the transfer of dye molecules from a dye bath to fibre or yarn materials. The process has long been studied by chemists and physicists, particularly in relation to dye sorption, desorption, and the formation of dye–fibre bonds. Modern understanding of dyeing considers thermodynamic principles alongside the dynamic changes that occur in dyeing temperature, dye concentration, bath composition, and fibre structure.
Affinity and diffusion are fundamental to the dyeing process. Affinity describes the attraction between a dye and a fibre, while diffusion determines the rate at which dye molecules move through the fibre from regions of higher concentration to regions of lower concentration. Together with fibre characteristics, these factors influence dyeing speed, temperature dependence, equilibrium dye exhaustion, and certain fastness properties.
Dyeing processes are broadly classified into nonionic and ionic systems. Nonionic dyeing includes the application of disperse dyes to synthetic fibres such as polyester, nylon, and triacetate. Disperse dyes are particularly relevant to polyester yarn dyeing, where process conditions such as temperature, pH, particle size, dispersing agents, and fibre fineness affect dye uptake, shade uniformity, and final product quality. Commercial production involves operations such as soft winding, batching, dyeing, hydroextraction, drying, and packaging, supported by appropriate machinery, raw materials, and process control.
Cost Estimation
| Plant Capacity | 4.00 MT/day |
|---|---|
| Land & Building (3000 sq.mt) | Rs. 2.01 Cr |
| Plant & Machinery | Rs. 2.50 Cr |
| Working Capital for 1 Month | Rs. 2.38 Cr |
| Total Capital Investment | Rs. 7.04 Cr |
| Rate of Return | 22% |
| Break Even Point | 61% |
Content Index
- INTRODUCTION
- PROPERTIES OF POLYESTER FIBRES
- PHYSICAL PROPERTIES
- CHEMICAL PROPERTIES
- PROPERTIES OF DISPERSE DYES
- DISPERSE DYES AND ITS CLASSIFICATION
- DISPERSE DYES
- CLASSIFICATION
- GENERAL STRUCTURE OF AMINOAZOBENZENE DYES.
- SOME TYPICAL AZO DISPERSE DYE STRUCTURES.
- ANTHRAQUINONE DISPERSE DYES
- ANTHRAQUINONE SYSTEMS OF BASIC FORMULA; 9,10-ANTHRAQUINONE
- COMMERCIAL ANTHRAQUINONE DISPERSE DYES.
- OTHER DISPERSE DYE CLASSES
- USES AND APPLICATION
- B.I.S. SPECIFICATION
- MARKET SURVEY
- MARKET SIZE
- INVESTMENT
- SOME OF THE MAJOR INVESTMENTS IN THE INDIAN TEXTILES INDUSTRY ARE AS FOLLOWS:
- GOVERNMENT INITIATIVES
- INITIATIVE WILL BE TAKEN INTO CONSIDERATION BY GOVERNMENT OF INDIA.
- SOME OF INITIATIVES TAKEN BY THE GOVERNMENT TO FURTHER PROMOTE THE INDUSTRY ARE AS UNDER:
- TEXTILES EXPORT
- THE BREAK-UP OF OUR CURRENT EXPORTS ARE AS FOLLOWS:
- PROJECTIONS FOR INDIA IN WORLD EXPORTS
- PROJECTIONS FOR DOMESTIC TEXTILES INDUSTRY
- MARKET POSTION OF TEXTILE YARN
- MAJOR PLAYERS IN TEXTILE INDUSTRY
- MAJOR PLAYERS IN THE INDUSTRY
- PROFILE OF MAJOR PLAYERS IN INDIA
- WELSPUN INDIA LTD.
- VARDHMAN GROUP
- PRODUCTS
- MANUFACTURERS/SUPPLIERS OF YARN DYEING (DYED YARNS)
- DYES USED IN POLYESTER YARN DYEING
- FASTNESS PROPERTIES:-
- PROCESS OUTLINE FOR YARN DYEING
- SOFT WINDING
- BATCHING
- DYEING
- HYDROEXTRACTOR
- DRYER
- PACKAGING
- PROCESS FLOW DIAGRAM
- PROCESS OF MANUFACTURE OF POLYESTER YARN DYEING
- PREPARATION FOR DYEING OF POLYESTER YARN
- PROCESSING DETAILS AND MECHANISM OF POLYESTER DYEING
- EFFECT OF VARIOUS CONDITIONS ON DISPERSE DYEING:
- EFFECT OF TEMPERATURE:
- EFFECT OF PH:
- CARRIER DYEING METHOD:
- PROCEDURE:
- HIGH TEMPERATURE DYEING METHOD:
- PROCEDURE:
- METHED OF DISPERSE DYEING
- BASIC PRINCIPLE
- DISPERSE DYEING MECHANISM
- THE FOUR STAGES OF THE PROCESS MECHANISM ARE AS FOLLOWS:
- THE EFFECTS OF VARIATIONS IN DISPERSE DYEING
- CRYSTAL FORM OF THE DISPERSE DYES
- DISPERSING AGENT
- PARTICLE SIZE IN DISPERSION OF THE DYES
- PH OF DYEBATH
- SUBSTANTIVITY OF DISPERSE DYES
- TEMPERATURE
- FIBRE FINENESS
- MAIN METHODS OF DISPERSE DYEING
- CARRIER DYEING
- HIGH TEMPERATURE DYEING
- ADSORPTION PHASE
- PHASES OF EXHAUST DYEING OF POLYESTER.
- DIFFUSION PHASE
- CLEARING PHASE
- CHEMICAL REACTION DURING REDUCTION CLEARING
- POLYESTER DYEING RECIPE
- STAGES AND PARAMETERS IN POLYESTER YARN DYEING
- IMPORTANT PARAMETERS IN POLYESTERS YARN DYEING
- SEQUENCES IN POLYESTER YARN DYEING
- PROCESS FLOW DIAGRAM
- METHOD OF NYLON YARN DYEING
- PRETREATMENT & DYEING:
- PROCESS FLOW DIAGRAM
- METHODS FOR DYEING (COTTON YARN DYEING)
- PREPARATION FOR DYEING
- RAW STOCK
- COTTON YARN
- AN EXAMPLE OF SUCH A TREATMENT FOR 100 LB (POUNDS) OF YARN IS THE FOLLOWING:
- DYEING MEDIUM
- DETAILS OF DYESTUFF, STORAGE & HANDLING
- DIRECT DYES
- DETAILS OF YARN CONDITIONING
- CONDITIONING PROCESS FOR VARIOUS YARNS:
- SUPPLIERS OF RAW MATERIALS
- SUPPLIERS OF PLANT & MACHINERY
- VERTICAL YARN DYEING MACHINE
- SAMPLING DYEING MACHINE
- AIR COMPRESSORS
- HYDRO EXTRACTOR
- BOILERS
Appendix
- COST OF PLANT ECONOMICS
- LAND & BUILDING
- PLANT AND MACHINERY
- FIXED CAPITAL INVESTMENT
- RAW MATERIAL
- SALARY AND WAGES
- UTILITIES AND OVERHEADS
- TOTAL WORKING CAPITAL
- COST OF PRODUCTION
- PROFITABILITY ANALYSIS
- BREAK EVEN POINT
- RESOURCES OF FINANCE
- INTEREST CHART
- DEPRECIATION CHART
- CASH FLOW STATEMENT
- PROJECTED BALANCE SHEET
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