Industry Overview
Denim garments have become a major fashion trend, particularly among youth, and the spread of denim culture worldwide has driven rapidly changing washing and finishing techniques. Several denim washes, including stone wash, acid wash, and moon wash, have been introduced over time. India has experienced significant developments in denim garment washing, supporting the production of high-quality garments with strong aesthetics and value for price.
Back staining is an important quality concern in denim processing. It refers to the soiling of weft threads and pocket linings by detached indigo dye or its reduced leuco form, commonly occurring during desizing, stone washing, and enzyme stone washing. Back staining can reduce garment appearance and market value, so anti-back-staining agents are used in wash baths along with other process chemicals. These agents help prevent removed dyes from redepositing on the garment.
During stone or enzyme washing, cellulose degradation releases indigo dye. Cellulase activity hydrolyzes cellulose through several enzymatic components, while glucose formation can contribute to the reduction of indigo. The reduced indigo has lower affinity for the cellulose fibre and can soil weft threads and pocket linings, particularly under alkaline conditions and elevated wash-bath temperatures. Neutral cellulase, typically operating at pH 6–8 and 50–60°C, generally has a less negative effect on tensile strength than acid cellulase and can therefore result in less back staining. Minimizing back staining improves the contrast between blue and white yarns, although the effect is more practically assessed through indigo redeposition on white denim.
Cost Estimation
| Particular | Value |
|---|---|
| Plant Capacity | 2 Ton/Day |
| Land & Building (500 sq.mt.) | Rs. 1.41 Cr |
| Plant & Machinery | Rs. 18 Lac |
| Working Capital for 1 Month | Rs. 98 Lac |
| Total Capital Investment | Rs. 2.64 Cr |
| Rate of Return | 36% |
| Break Even Point | 48% |
Content Index
- INTRODUCTION
- CHEMISTRY OF BACK STAINING
- COMPOSITION OF THE ANTI BACK STAINING AGENT
- ANTI BACK STAINING AGENT
- PRODUCT INFORMATION
- KEY FEATURES & BENEFITS
- GENERAL CHARACTERISTICS
- APPLICATION
- 1. BIO-POLISHING:
- 2. STONE WASHING
- ANTI BACK STAINING METHOD
- USES AND APPLICATION
- PROPERTIES
- OVERVIEW OF BANGLADESH DENIM
- TEXTILE AND GARMENTS INDUSTRY IN BANGLADESH
- SCENARIO OF DENIM MARKET OF BANGLADESH
- TOP FOREIGN DENIM BUYER OF BANGLADESH
- SWOT ANALYSIS OF DENIM SECTOR OF BANGLADESH
- STRENGTH OF BANGLADESH DENIM INDUSTRY
- WEAKNESS OF BANGLADESH DENIM INDUSTRY
- OPPORTUNITIES OF BANGLADESH DENIM INDUSTRY:
- THREATS OF BANGLADESH DENIM INDUSTRY
- PRESENT MANUFACTURE OF ANTIBACK STAINING AGENT
- FORMULATION OF ANTIBACK STAINING AGENT
- PROCESS:
- PROCESS FLOW DIAGRAM
- PRINCIPLES OF PLANT LAYOUT
- STORAGE LAYOUT:
- EQUIPMENT LAYOUT:
- SAFETY:
- PLANT EXPANSION:
- FLOOR SPACE:
- UTILITIES SERVICING:
- BUILDING:
- MATERIAL-HANDLING EQUIPMENT:
- RAILROADS AND ROADS:
- MAJOR PROVISIONS IN ROAD PLANNING FOR MULTIPURPOSE SERVICE ARE:
- PLANT LOCATION FACTORS
- PRIMARY FACTORS
- 1. RAW-MATERIAL SUPPLY:
- 2. MARKETS:
- 3. POWER AND FUEL SUPPLY:
- 4. WATER SUPPLY:
- 5. CLIMATE:
- SPECIFIC FACTORS
- 6. TRANSPORTATION:
- A. AVAILABILITY OF VARIOUS SERVICES AND PROJECTED RATES
- 7. WASTE DISPOSAL:
- 8. LABOR:
- 9. REGULATORY LAWS:
- 10. TAXES:
- 11. SITE CHARACTERISTICS:
- 12. COMMUNITY FACTORS:
- 13. VULNERABILITY TO WARTIME ATTACK:
- 14. FLOOD AND FIRE CONTROL:
- EXPLANATION OF TERMS USED IN THE PROJECT REPORT
- 1. DEPRECIATION:
- 2. FIXED ASSETS:
- 3. WORKING CAPITAL:
- 4. BREAK-EVEN POINT:
- 5. OTHER FIXED EXPENSES:
- 6. MARGIN MONEY:
- 7. TOTAL LOAD:
- 8. LAND AREA/MAN POWER RATIO:
- PROJECT IMPLEMENTATION SCHEDULES
- INTRODUCTION
- PROJECT HANDLING
- PROJECT SCHEDULING
- PROJECT CONSTRUCTION SCHEDULE
- TIME SCHEDULE
- SUPPLIERS OF RAW MATERIALS
- SUPPLIERS OF PLANT AND MACHINERY
Appendix
- APPENDIX – A:
- 01. PLANT ECONOMICS
- 02. LAND & BUILDING
- 03. PLANT AND MACHINERY
- 04. OTHER FIXED ASSESTS
- 05. FIXED CAPITAL
- 06. RAW MATERIAL
- 07. SALARY AND WAGES
- 08. UTILITIES AND OVERHEADS
- 09. TOTAL WORKING CAPITAL
- 10. TOTAL CAPITAL INVESTMENT
- 11. COST OF PRODUCTION
- 12. TURN OVER/ANNUM
- 13. BREAK EVEN POINT
- 14. RESOURCES FOR FINANCE
- 15. INSTALMENT PAYABLE IN 5 YEARS
- 16. DEPRECIATION CHART FOR 5 YEARS
- 17. PROFIT ANALYSIS FOR 5 YEARS
- 18. PROJECTED BALANCE SHEET FOR (5 YEARS)
Frequently Asked Questions
Back staining is the redeposition of detached indigo dye or its reduced leuco form onto areas such as weft threads and pocket linings. It commonly occurs during denim desizing, stone washing, and enzyme stone washing. The redeposited dye can reduce the contrast between blue and white yarns and negatively affect garment appearance. Because appearance is an important quality characteristic in denim, controlling back staining is an important part of the washing process.
Anti-back-staining agents are used to help prevent removed indigo dye from redepositing on denim garments during washing. They are added to the wash bath together with other chemicals required for the selected washing process. By limiting dye redeposition, these agents can help maintain cleaner white areas, improve the contrast between blue and white yarns, and support consistent garment appearance. Their selection and application should be compatible with the washing process, fabric construction, and desired garment finish.
Cellulase contributes to back staining by hydrolyzing cellulose during enzyme washing and helping release indigo from the denim surface. Cellulase systems contain different enzymatic components that progressively break down cellulose into smaller products, ultimately including glucose. The report explains that glucose can partially reduce indigo, producing a form with lower affinity for the cellulose fibre. This reduced indigo can then soil weft threads and pocket linings, with alkaline conditions and wash-bath temperature also influencing the effect.
Acid and neutral cellulases differ primarily in their preferred processing conditions and their effects on denim. According to the report, acid cellulase has a strong effect on cellulose hydrolysis and can create more glucose formation, which may increase back staining. Neutral cellulase has an optimum pH of 6–8 at temperatures of 50–60°C and is described as having a less negative effect on tensile strength than acid cellulase. Process selection should therefore consider the required wash effect, fabric performance, and back-staining control.
Back staining can be evaluated by assessing the redeposition of indigo on white denim areas. The desired result is a strong visual contrast between blue yarns and white yarns, which indicates minimized staining. Because this contrast can be difficult to quantify directly, measuring indigo redeposition on white denim provides a more practical way to assess the extent of back staining. Consistent evaluation can help compare washing conditions and determine whether process controls or anti-back-staining treatment are achieving the required appearance.
Back staining can be influenced by enzyme activity, cellulose hydrolysis, indigo release, wash-bath pH, temperature, and the specific washing process. The report highlights the role of alkaline conditions and temperature in supporting the redeposition effect. The type of cellulase is also important because acid cellulase can promote greater cellulose hydrolysis and glucose formation. Effective process control therefore involves selecting suitable washing chemistry and operating conditions while using anti-back-staining agents where required.
The reported plant capacity is 2 Ton/Day. This figure is stated in the project report's cost estimation section and represents the planned production capacity for the project. Capacity is an important consideration when evaluating plant layout, equipment requirements, utilities, raw-material handling, working capital, and overall project economics. The report also provides associated project cost figures, but these should be interpreted together with the detailed economic schedules contained in the project appendix.
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