Textile Finishing; Stain Repellency and Stain Resistant Finishing

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There are some textile products or fabric those used long time without any types of wash. So some special care must be taken for those materials. Stain Repellency finishing and Stain-Resistant Finishing are those special treatment whish ensure the proper care of the textile material. This types of finishing also cares from oil and wax. 

Stain Repellency finishing: 

Scotchgard and other finishes that repel water and oil may be classified as stain resistant finishes. These finishes decrease the surface energy of the fabric so that water or oil beads up rather than penetrating the fiber. Illustrates this principle with two different stain-repellent finishes: fluorochemical and silicone. The fluorochemical finish, like DuPont’s Teflon finish on cookware, prevents both oil and water from penetrating the fabric surface. The silicone finish, which also coats the fabric, repels water but not oil.Soil-Release Finishes 

Soil-release finishes were developed largely as a result of the tendency of durable press and polyester fabrics to absorb and hold oilborne stains. The soil-releasing finish should not be confused with stain-repellent finishes, although Scotchgard is both stain resistant and soil releasing. Soil-release finishes alter the characteristics that cause soil to bond to the fibers. Agents such as polyethylene glycol derivatives may be added to the polymer solution before extrusion to make the nonabsorbent fibers more hydrophilic (“water loving” or having a strong affinity to water). Other finishes may form hydrophilic grafts on the fiber resulting in improvements in soil release and soil redeposition. Most soil-releasing finishes are applied during the finishing of the fabric and are compatible with durable pres; finishes. 

Some fluorochemical finishes are dual-acting. They are block copolymers of fluorocarbons and polar segments such as esters. In air the fluorocarbon sections come to the surface to repel oily substances. When the finished fabric is immersed in water, however, the polar hydrophilic sections predominate on the surface, attracting water to help release soils. At the same rime that soil-releasing finishes increase the receptivity of fibers to water, a second benefit is gained. Static electricity buildup is decreased as absorbency is increased. 

Increased absorbency also increases the comfort of the garment in warm weather. Fuzzing and pilling seem to be decreased by soil releasing finishes as well, because the finish also lubricates the fabric. Effective soil-releasing finishes should result in fabrics from which common soil is removed during home laundering with normal detergents. Oily stains, often hard to remove from durable press fabrics, should be removable in home laundering. The disadvantage of most of these finishes is that they are gradually diminished through laundering. 

Stain Resistant Finishing: 

Stain-resistant finishes for nylon carpets were developed to increase the resistance of these carpets to food and other common stains. The finishes are generally sulfonated aromatic condensation (SAC) compounds that function essentially as colorless dyes. The stain blockers, which have negative charges, are attracted to the positive sites in the nylon fibers, tie up the dye sires, and set up a barrier layer to staining materials. Many food stains, for example, which are negatively charged like the stain resist molecules, are not absorbed as easily. Today, stain-resistant finishes are used on most nylon carpets for residential use. One trademark is DuPont’s Stainmaster.

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Textile Finishing; Waterproofing finishing, Soil and Water Repellency finishing

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Textile Finishing and Fabric finishing is very important terms in textile manufacturing area. We need some special task with textile material to meet the buyer requirement. We know that natural fibres as well as textile fabric manufactured with natural fibre absorb the water. So it easily passes water with their surface. If we want to protect passing water or making the water proof fabric surface, we need to do some special treatment to surface of the fabric. This could be known as water proofing finishing. This is similar for Soil and Water Repellency finishing. The term water repellent should not be confused with the term waterproof Water-repellent fabrics resist penetration by water but are not completely waterproof. Such fabrics represent a practical alternative to fabrics that keep out water and air.

Waterproofing finishing: 

For a fabric to be truly waterproof, it must be completely sealed with a substance that is insoluble in water. The familiar rubber coated garb of police officers and firefighters is a good example. Modern waterproofing materials include the vinyl resins, which do not oxidize and crack as readily as rubber. Synthetic rubbers are also more durable to outside influences than natural rubber. The fabrics used in most of today’s waterproof materials are cotton and nylon. The latter, coated with vinyl resins, has largely superseded the heavy canvas tarpaulins used to protect merchandise in transit. A fabric that is waterproof allows no water to penetrate from the surface to the underside. Coatings made from rubber or synthetic plastic materials can create fabrics that are completely waterproof; however, these fabrics tend to be warm and uncomfortable because they create a barrier that traps air and perspiration close to the body.

The dilemma of providing protection and comfort was resolved by the development of fabrics that are described as waterproof and breathable (WP/B). The general principle behind these fabrics is that they keep out water from rain and snow but allow the passage of moisture vapor from perspiration. They are promoted for use in outdoor clothing and for active sports. One of the first of these products was Gore- Tex, made by placing a membrane of fluoropolymer underneath a layer of outer fabric. The membrane is porous.

The pores are smaller than a drop of water that contains many water molecules, but they are larger than a molecule of water vapor. This structure keeps out rain but allows moisture from perspiration to escape.

The success of Gore- Tex has led to the production of other products using similar principles. Many of these use polyurethane coatings with microscopic pores. Sympatex, a polyester membrane for lamination, is nonporous but breathable. A charged outer surface attracts polar water molecules which are drawn through the membrane. Also helping to “push” moisture vapor through is the high vapor pressure on the body side (Sympatex 1988).

Soil and Water Repellency finishing:

Soiling results when a textile comes into contact with soiled surfaces or with air- or waterborne soils. Soil is retained either by mechanical entrapment of soil particles within the yarn or fabric structure or by electrostatic forces that bond the soil to the fabric. One way to approach the problem of soiling is to prevent its deposition on the fabric. Another is to seek ways to facilitate its removal. Special finishes have been developed that have taken both of these approaches.

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Fabric Shrinkage Control by Textile Finishing

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Fabric finishing is most effective procedure to maintain the fabric property. Most of the fabric property could be maintained by textile finishing. There are different types of textile finishing. Such as Mechanical finishing, Chemical finishing or other special finishing. 

Fabric shrinkage is one of most important fabric property. Shrinkage property is depending upon the fibre property. It effects in finished garments shape. We know that every style of garments have particular size. The most popular sizes are Small(S), Medium(M), Large(L), Extra Large(XL) etc. size of particular garment indicate by pattern grading. Most probably 1cm to 2 cm varies from one size to another size. Due to shrinkage the size of the garment could be change abnormally. For example Length of a garments increase but chest does not change. So it will be subjected as size mistake but the size was ok during fabric cutting. That’s why shrinkage property of fabric must be controlled by particular finishing method before cutting the fabric. 

A reduction in the length or width of a fiber, yarn, or fabric is known as shrinkage. If fabrics shrink after they have been made into garments or household items, they may decrease in size to such an extent that the item is no longer serviceable. For example, a garment with a 25-inch waist size will decrease by 11\4 inches if it shrinks 5 percent. Growth occurs when a fabric increases in dimension. Some fibers such as wool, cotton, and rayon swell more in water than do others. Fabrics made from these fibers are less dimensionally stable than fabrics made from fibers with lower moisture absorbance. Wetting a fabric causes the tension that has been applied during its manufacture to be relaxed, so that fabrics generally shrink after the first and subsequent launderings. This type of shrinkage is known as relaxation shrinkage. It occurs because the moisture within the fibers allows them to return to the dimensions they occupied before they were stretched during processing. The amount of relaxation shrinkage depends on the amount of stretching the fibers underwent during manufacturing. 

Wool fibre and rayon fibre, which are more extensible, will stretch more and therefore have greater potential for relaxation. Successive heating and drying cycles may produce progressive shrinkage, where the fabric continues to shrink. Woven fabrics generally shrink more in the warp than in the filling direction because the warp yarns are under greater tension during weaving. When the fabric is later subjected to moisture, or heat in the case of thermoplastic fibers, the stresses within the fibers are relieved, and the fabric relaxes. Fibers that are moisture-absorbent absorb a significant amount of water and swell. Accordingly, the yarn diameter increases, and the yarns in each direction must move closer together to accommodate the yarns in the opposite direction. This is a less strained position for the yarns and results in a permanent increase in crimp, especially in warp yarns. 

Knit goods tend to stretch more during manufacture than woven goods, and therefore knit goods are likely to shrink and change shape even more than woven goods. Procedures and solvents used in commercial dry cleaning, as a rule, do not permit fabrics to relax, as washing does, so that items that are dry cleaned may not shrink as readily. Shrinkage in dry cleaning generally results from the high moisture content in the solvent or from steaming the fabric during pressing.

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TEXTILE FINISHING; CONVENTIONAL AND SPECIAL FINISHES FOR TEXTILE FABRICS AND YARNS

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Textile or Fabric Finishing

The textile finishing is an important process for production of finished textile fabrics and garments. Textile finishing usually includes treatments such as scouring finishing, bleaching finishing, dyeing and/or printing, the final mechanical finishing or chemical finishing operations of textiles, that during this stage are carried out on textile products (staple, sliver or top, yarns or filaments, woven or knitted fabrics to enhance their basic characteristics like dye penetration, printability, wettability, colour, hand, and appearance of textile material.

By special textile finishing, we also mean all the processing operations that, though included in the so called finishing stage, are generally applied to the textile fabrics to improve their appearance, hand and properties, at times in accordance with their field of application.

The textile finishing stage plays a fundamental role in the excellency of the commercial results of textiles, which strictly depend on market requirements that are becoming increasingly stringent and unpredictable, permitting very short response times for textile manufacturers. The latest finishing machines on the market used for textile finishing operations generally offer multi-purpose applications; the flexibility and versatility features of these finishing machines are uninterruptedly evolving to grant excellent consistency of the results in finishing process.

The making of a marketable consumer-usable textile fabric is not completed after fabric formation, dyeing, or printing. Fabrics usually still need to undergo and additional processing know as textile finishing, which is the final processing before the fabric is cut into apparel or made into articles such as towels, curtains, or draperies. Finishing is what makes fabrics more suitable for their intended end use. Final inspection to ascertain fabric quality is performed at the completion of finishing. There are many types of finishes; some make fabrics softer after finishing, some stiffer after finishing, some water-repellent after finishing, and some shrink-resistant after finishing. Some fabrics may have two or more finishing treatments at a time in the finishing machine. Certain finishes are so temporary that they completely lose their effectiveness after one laundering. Therefore, understanding textile finishes and the properties they impart, the fibers and fabrics to which they may be applied, and their limitations and shortcomings is important to an overall understanding of textiles.

Most textiles finishing processing are performed in the same plants as dyeing or printing. Most dyers and printers are also finishers, with finishing being considered a separate but integrated department of the dyeing or printing organization.

Classification of textile Finishes and finishing process:

Textile finishing operations can be carried out by means of discontinuous, continuous and semi continuous systems according to the finishing machine.

Discontinuous or batch-type systems of finishing:

A single or individual finishing machine is used to complete all the finishing stages.After taking all types of preparation the finishing machine is loaded with the textile material. Predetermined cycles are carry out according to the finishing process. After completing the process the machine is unload and finally wash it thoroughly before starting a new cycle. This process is suitable for small batch and the working procedures are most easy and flexible. for example, it is easy to a carry out a bleaching process on a single machine, and then a scouring one followed by a dyeing process. The discontinuous process is labour-intensive for the production of large production because it necessary more man power to handle and transport the textile material; it is also a time oriented process and results that can change  from one lot to another.

Continuous systems of finishing: 

 A series of machines are required for continuous finishing system. Each machine carries out always and solely the same process.According to production requirements each finishing machine are arranged. Initial cost of this system is higher and the machine set up very much complex.but once the system has developed according to proper plane, it requires a smaller manpower and grants excellent repeat ability and high production rates; So it is stat that the continuous system is beneficial for producing large batch of textile material with the highest cost-efficiency and productivity.

Semi-continuous systems of finishing: 

Semi continuous finishing system is modern and result oriented method. In this system the continuous finishing machine and discontinuous finishing machines are used for better performance.For explain the procedure it is said that a continuous finishing machine is used to wet the textile material. The machine could be continuous pad batch machine, The small and medium lots are suitable for these mixed systems of finishing. In that process the quality of the product is higher but the cost is medium but more manpower is required.

Textile finishes and finishing are classified in several ways, the most common classifications being aesthetic finishes, which modify the appearance and/or hand or drape of fabrics, and functional finishes, which improve the performance properties of fabrics. The textile finishes discussed in this articles are presented in these two categories.

Finishes are also classified as chemical finishes and mechanical finishes. Those finishing are also called wet finishing and dry finishing, respectively. Wet finishes are normally used to textile material by padding, followed by drying or curing.Mechanical finishing are special types of process used to change change the  appearance by changing the surface the fabric or any textile material. It related to specific physical treatment . Finishes are also categorized by their degree of permanence. These finishes are called durable,semi durable temporary and permanent finish. Permanent finishes do not change or alter throughout the life of a textile material. usually involve the change in structure of fibre structure by special chemicals.

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STUDY ON THE BARRIERS OF HIGHER PRODUCTION AND ITS REMEDIES IN THE GERMENTS INDUSTRY

School:                               Science and Engineering

Course of Studies:            B.Sc. in Textile Engineering

Supervising Teacher    

Professor Dr. Md. Abul Kalam Azad

Guest Faculty,  Professor.

Department of Textile engineering,

Southeast University.

ABSTRACT

Barriers of production are the major issue in apparel garmentmanufacturing which determines the effectiveness of total garments system and run the process towards the up to mark standard. The main objective of this project is to determine the suitable tools can be used specially for textile garments manufacturing, find out the problems restricting the production, generating proper solution and implement them in a proper way. In this study all data included of production capacity both for past state and present state which shows the comparative improvement of before implementation and after implementation of these tools. Methodology of this project was to find out the barriers, non productive time and determine the best possible way to eliminate major problems which are responsible for productivity loss in apparel garments sector.

The phase-out of the quota is likely to have particular significance for the export of Bangladesh apparels to the US market. MFA’s impacts are not much related to a question of our $2 billion exports to the USA; or the $5 billion worth of exports made by Bangladesh globally. Rather, it is a question of how Bangladesh’s entire economy will be affected by the issue of quota phase out. Readymade garment exports constitute about 85% of Bangladesh’s annual export and provide direct employment to 1.5 million females and indirectly an additional 8 to 10 million people. The global clothing trade is evolving on a continuous basis and that the phase out of quota restrictions and forming of trade blocs has become a reality. Moreover Bangladesh is convulsed by fierce class struggles, centered on the country’s garment industry. Many tens of thousands of workers have gone on strike, blocked roads, attacked factories and other buildings, demonstrated, fought the police and rioted in the streets. Every day comes news of fresh strikes in a variety of industries —mainly the ready-made garment (RMG) sector, but also mill workers, river transport workers, rail workers, journalists, lecturers and teachers. A massive army and police presence around garment factories, in some cases completely blockading and creating check points for entry to Export ProcessingZones, temporarily calmed things; but strikes continued to take place at numerous factories, leading to solidarity strikes from nearby workplaces and semi- spontaneous demonstrations.

ACKNOWLEDGEMENT

Industrial Attachment Course is an academic function of the Textile Engineering Department of Southeast University.

At first we desire to express our deepest sense of gratitude of almighty Allah for giving us knowledge, energy and patience for completing the project work successfully.

A number of people have made significant contributions in preparing this report. Their insights, advice and suggestions helped us a lot.

We wish to express our deepest gratitude to Syed Fakhrul Hasan, Professor & Chairman of Textile Engineering Department, SEU, for his continuous guidance, invaluable & constructive comments and endless encouragement throughout the research work and the preparation of this project. With profound regard we gratefully acknowledge our respected  teacher Professor Dr. Md. Abul Kalam Azad  his generous help and day to day suggestion during preparation of the project. Guest Faculty, Department of Textile Engineering, SEU. He has enriched us with necessary ideas and concepts for incessant improvement of the report.

We would like to express our sincere gratitude to Mr. Salahuddin Ahmed, AGM(IE),  for providing us all necessary information & guide line. His valuable opinion has enriched our knowledge to carry out the training and portray the information in a logical sequence

We like to give thanks especially to our friends and many individuals, for their enthusiastic encouragements and helps during the preparation of this report us by sharing ideas regarding this topic.

We would like to thank and acknowledge to all Operators, Workers, Production Officers, Production managers, Work study Officers, IT Officers, AGM of all sections, Sardagonj, Kashimpur, Gazipur, Bangladesh.

Finally, thanks for those who helped us directly and indirectly during the different stages of the present project work.

 

Contents

2.1. Factors of higher production:

2.2. Problems Regarding With RMG

2.3. Safety Problems

2.4. External and Internal Barriers of Higher Production

2.4.1. Economical problems:

2.4.1.1. Community problems:

2.4.1.2. Political problems:

2.4.1.2.1. Hartal :

2.4.1.2.2. Strike :

2.4.1.2.3. Internal politics :

 2.4.1.3. Transportation problem:

2.4.1.3.1. Internal transportation:

2.4.1.3.2. External transportation:

2.4.1.4. Drudge Problem:

2.5. Inventory Section

2.6. Cutting section

2.6.1 Remedies :

2.7. Production section :

2.8. Finishing section :

3.1. Tools & Equipments to be used for doing this work:

3.2. Procedure/Method for doing this job:

3.3. Flow chart of Garments manufacturing:

3.4. Barriers of each section and its remedies:

3.4.1. Sample section:

3.4.2. Cutting section:

3.4.2.1. Worker’s absenteeism of Spreading:

3.4.2.2. Delay fabric receiving:

3.4.2.3. Power Problem

3.4.2.4. Type of marker

3.5. Other common barriers of cutting section

3.6. Suggestion for cutting floor to DBL group

3.7. Future invention

3.8.  Sewing section:

3.8.1.  Different types of sewing defects:

3.8.2. Reason of needle breakage:

3.8.3.  Sewing section problems

3.9. Finishing section:

3.10. Social &Environmental Information in DBL Group:

3.10.1. Scope of employment opportunity:

3.10.2.  Internship Program:

3.10.3. Environmental pollution control:

 3.10.4.  Noise, dust pollution control and air emission:

3.10.5.  Health, Safety and hygiene awareness:

3.11.  Policy Regime of Government

3.12. Infrastructural Impediments

3.13.  Labor Productivity

3.14.  Supportive Government Policy

3.15.  Limitations of the Report

4.1. CONCLUSION

4.2. RECOMMENDATION FOR THE COMPANY

8.4.3.3 Shrinkage data    Error

8.4.4      Experiment No: 01.

8.4.5      Experimental data: 02

9.            Steam relax dryer description:

9.1.1      Features:

9.1.2      Technical specifications:

9.1.3      High Efficiency Blower Device of Drying:               

9.1.4      Over feeding area:

9.1.5      Structure of Nozzle:

9.1.6      Air contorl & speed system:

 9.1.7     Oil Heating Media:          

9.1.8      Extra Accessories:           

10.          Data from steam dryer:

10.1        Experiment No: 01         

10.2        Experiment No: 02

11.          Discussion:

12.          Conclusion:

List of table:

List of figure

Referrence:

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TINTING WITH WHITE DISCHARGE EFFECT ON DENIM GARMENTS

TINTING:
Coloration that produces a very pale shade. A tint usually represents the minimum amount of color that will give perceptible appearance of coloration. In yarn processing, fugitive tints are used for identification, and then removed in wet processing.

Tinting (also called over-dyeing) Laundries often tint denim to try to make it look more vintage, or to achieve a different cast. The telltale signs of a pair of jeans that have been tinted are that the pocket lining and labels are dyed as well as the jeans.

TINTING WITH WHITE DISCHARGE EFFECT ON DENIM GARMENTS

The standard route to blasting/discharging/tinting is quite elaborate, in the light of three effects to be imparted on the same garment. There have been short cuts, which may be right/wrong/ingenious. If tinting is done on blasted/discharged areas, it obviously remains a spray method. However, if the tinting is overall, it follows the dyeing route. The process starts on gray garment being hand blasted followed by desizing and biopolishing. After drying the garment, tint-spray is given followed by air/machine drying and finishing. For tinting by dyeing method, the biopolished garment can straight away go for tinting wet-on-wet followed by finishing and drying.
In case of white discharge tinting the route would start with desizing-biopolishing on gray garment, peroxide bleaching after biopolishing being optional. After drying the garment, a potassium permanganate spray is given to areas where white discharge is aimed at. After air-drying for about 10-15 minutes, a neutralization step consisting of provide-acetic acid is given which is followed by hot and cold rinses. In case of spray tinting the garment will have to be dried first, whereas for overall tinting, dyeing the method could be followed wet-on-wet. Finally the finishing and drying would complete the process.

BEFORE TINTING WITH WHITE DISCHARGE EFFECT ON DENIM GARMENTS

AFTER TINTING WITH WHITE DISCHARGE EFFECT ON DENIM GARMENTS

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