Monday, September 3, 2012

Reasons for Studying Textiles:



A study of textile engineering will show, for example, why certain textile fabrics are more physically durable and therefore more serviceable for specific purposes. It will explain why certain textile fabrics make cool wearing apparel as well as give an impression of coolness when used as decoration. The matter of cleanliness and maintenance must also be estimated before purchasing when that is an important factor.

Complete knowledge of textile engineering will facilitate an intelligent appraisal of standards and brand of apparel garments merchandise and will develop the better ability to distinguish quality in textile fabrics and, in turn, to appreciate the proper uses for the different qualities. A result, both the garments consumer merchant and consumer customer will know how to buy and what to buy, and salespeople will know how to render good service to those consumers who have not had the advantage of a formal course in textile engineering.

Great strides have been made in the textile, garment industry, and have markedly influenced our general economic growth. The prosperity and growth of related industries, such as retail apparel stores, have produced broader employment opportunities. Competition for the textile consumer’s dollar has fostered the creation of new textile fibres with specific qualities to compete with well-established textile fibers. New fiber blends have been created to combine many of these qualities into new types of yarns with new trademarks. There are also new names for textile fabrics made of these new textile fibers and yarns. New finishes have been developed to add new and interesting characteristics to textile fibers, yarn and fabrics.

This welter of creativity and the myriad of trademarks present a challenge to the textile consumer, who is sometimes knowledgeable but frequently confused. Yet one need not be. Without being overly technical, this information can be easily understood and consequently very useful to the textile consumer in business and personal to the textile consumer in business and personal life. All of this information can be adopted for such utilitarian benefits as economy, durability, serviceability and comfort, as well as for such aesthetic values as hand (or feel), texture, design and color of textile and apparel garments products.

In the study of textile engineering, the student’s initial interest will become an absorbing interest when they discover the natural fascinating of textile fabrics and their cultural associations, particularly when factual study is supplemented by actual handling of the textile and apparel materials. The subject will seem worthwhile as they become familiar with illustrative specimens and fabrics and being to handle and earn to compare the raw materials of which fabrics are made as well as the finished consumers goods.

USEFUL PURPOSES OF STUDYING TEXTILE PHYSICS:-
The useful purpose of studying textile physics are:-
1. To understand the detailed structure of fiber, yarn and fabrics
2. To understand the properties of fiber, yarn and fabrics.
3. To understand the behavior of fiber, yarn and fabrics in end condition.
4. To become able to design fiber, yarn and fabric having the required properties to meet the end-use requirements.
5. To identify faults & their causes & nature in fiber, yarn and fabrics.
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Sunday, September 2, 2012

Textile physics; Introduction to textile physics

Textile physics is very important subject for textile engineers or textile related students. I want to share my experience in this site. I am going to discuss about bellow topics. So be with me for more update.

Why study or learn                                                                                                    
Why study textiles                                                                                                     
Why study textile physics                                                                                          
Textile raw materials                                                                                                  
Classification of fibers                                                                                                                                    
Engineering approach to fibers, yarns and fabrics                                                     
Importance of textile structures for Engineers                                                                      
Physical and Mechanical properties of various fibers                                    
Textile properties developed by drawing                                                                  
Design and other fiber attributes                                                                               
Essential and desirable properties of textile fibers                                                    
Influence of fiber fineness                                                                                         
Miscellaneous properties of fibers                                                                             
Flexural rigidity of textile fibers                                                                                
Fiber migration                                                                                                           
Measurement of fiber migration                                                                                

PHYSICS FOR TEXTILE FIBRE, YARN AND FABRIC
Definition of yarn                                                                                                      
Factors affecting yarn strength                                                                                  
Parameters affecting physical properties of yarn                                                       
Classification of yarn                                                                                                 
Classification of yarn based on physical and performance characteristics                
Description of yarn                                                                                                    
Idealizes structural diagram of some yarns                                                                
Continuous filament and staple yarn structure                                                          
Fundamental structural features of yarn                                                                    
Yarn designation                                                                                                        
Relative consumption of yarn                                                                                    
Sewing thread                                                                                                            
Thread sizes                                                                                                               
Thread selection                                                                                                         

Importance of twist                                                                                                   
Types and direction of twist                                                                                      
Bedding or nesting                                                                                        
Determination of twist                                                                                               
Twist effects                                                                                                              
Angle of twist and twist factor                                                                                 
Effects of twist on yarn strength, extensibility and luster                                                
Geometry of twisted yarn                                                                                          
Idealized twisted yarn geometry                                                                               
Various comments on idealize yarn geometry                                                           
Yarn size and twist multiplier                                                                                    
Optimum twist factor                                                                                                            
Fiber packing in yarn                                                                                                 
Open packing of yarn                                                                                                
Hexagonal close packing of yarn                                                                               
Real yarn packing                                                                                                      
Concentrating and disturbing factors                                                                                    
Observed packing of fibers in real yarn                                                                     
Twist in relation to yarn bending                                                                               
Relation among twist angle, twist factor and yarn count                                          
Equation for yarn diameter                                                                                        
Equation for specific volume of yarn                                                                        
Show that d=4.44 x 10-6ÖTex / Density                                                                    
Relation among twist, diameter and twist angle                                                       
Estimation of Schwarz’s constant                                                                             
Yarn luster                                                                                                                 
Twist contraction and twist retraction                                                                                   
Limit of twist                                                                                                             
Contraction factor and retraction factor                                                                    
Derivation of expression for prediction of filament strain                                        
Limitations of Platt’s low strain equation                                                                  
                                                    

Geometry                                                                                                                   
Cloth geometry                                                                                                          
Reasons for studying cloth geometry                                                                                    
Weave and weave notation                                                                                        
Crimp                                                                                                                         
Warp crimp and weft crimp calculation                                                                     
Crimp percentage and take up percentage                                                                             
Distinction between crimp % (C) and take-up %(T)                                                 
Relationship between crimp (%) and take-up (%)                                                     
Pierce’s Flexible thread model                                                                                   
Importance of crimp on fabric properties                                                                  
Fabric behavior during tensile testing                                                                        
Measurement of crimp                                                                                               
Principles of edged crimped yarn                                                                              
Crimp measuring instrument                                                                                      
Pierce’s  model for plain weave                                                                                 
Equation for pick spacing (P2) and end spacing (P1)                                                
Equation for maximum warp yarn displacement (h1) and weft yarn displacement (h2)         
Dependence of crimp percentage                                                                              
Crimp interchange                                                                                                      
Equation for crimp  interchange                                                                                
Warp and weft yarn jamming                                                                                    
Equation for warp and weft yarn jamming                                                                
Biaxial, tri-axial and balanced structure                                                                    
Equation for rigid thread model                                                                                
Why rigid tread model was introduced                                                                     
Effect of yarn crimp on fabric properties                                                                  
Concept of similar cloth                                                                                             
Cover factor                                                                                                               
Yarn and fabric strength relationship                                                                                    
Handle, drape and shear                                                                                            
Measurement of drape ability                                                                                    
Some tensile properties of fabric                                                                                                                   

Electrical properties of textiles                                                                                  
Dielectric properties of textiles                                                                                  
Polarization and related effects                                                                                 
Power factor and dissipation factor                                                                           
Measurement of dielectric properties                                                                                                                                                                                 
Preparation of a test condenser                                                                                  
Measurement of impedance by Scherring’s bridge and resonance method               
Factors influencing dielectric properties of textiles                                                   
Electrical resistance of textiles                                                                                   
Conductors, semiconductors and insulators                                                              
Conduction of electricity in textiles                                                                          
Influence of dielectric constant on ions                                                                     
Normal, excited and ionized atom                                                                             
Electrical resistance of textiles                                                                                   
Measurement of resistances of textiles                                                                      
Specimen preparation for measuring resistances of textiles                                       
Influence of various factors on resistance of textiles                                                
Static charge                                                                                                              
Explanation of static phenomenon                                                                            
Theories of static charge                                                                                            
Measurement of charge in slivers by Faraday’s cylinder and Medley’s method                     
Generation of static charge in polymers                                                                    
Amphoteric behavior of keratin                                                                                 
Piezo and pyro electric charges                                                                                                                                                       
Leakage of static charges in air                                                                                  
Leakage of static charges in perfect insulators, moderate insulators, & conductors                              
Problems of static charges in textile mills                                                                  
Minimization of static charges in textile mills                                                           
The present view about static charges in textiles      

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Sunday, August 5, 2012

Introduction to work study and productivity improvement technique in textile and apparel garments Industry

Introduction to work study and productivity improvement technique:

Bangladesh has gone through an unprecedented growth of export oriented apparel garments industry. The growth rate is spectacular if seen from the view point that development in any other sector of industry was sluggish and of basic sector in particular, was negative and has been a source of drain on our resources.
At the starting garments business with a handful of units in 1978-1980, the clothing sub sector now comprises more than 43300 units and readymade apparel garments export value worth USD 6.40 billion.
Production of yarn, knit fabric, woven fabric, clothing and readymade garments items is rather a very complex job under a lot of pressure points. Added to the particular complexity and unique feature of apparel garments production there is the lack of appropriate management techniques.
Apparel garments and textile industry in this country are said to be not competitetive because of a host of reason. Many experts speculate with rational that with the withdrawal of quota protection. Apparel factories may find them in a deep hole unless some breakthrough takes place in the following areas:
1.    Shorting of lead time for producing apparel garments product.
2.    Effecting substantial improvement in productivity and quality of textile and garments items.
3.    Improvement of infrastructure
4.    Existence of due political stability
5.    Improvement of compliance status
Out of the mentioned measure the easiest one is the improvement of productivity and quality so as to be become competitive with the most difficult countries like china India Pakistan Vietnam countries of sub-saharan Africa and NAFTA ets.
A number of measures should be undertaken to substantially improve productivity of a textile or garments industry. The first and foremost measure to be implemented is introduction of work study principles in the apparel garments textile and dyeing industries.
Work study is a proper and specific management technique that introduce and determines standard time required to complete a job and discovers the best method and technique to accomplish the job in the easiest and cheapest way. As manual work abounds in the apparel industries work study is the only way to stipulate a time frame to complete each particular job. Work study is the only way to stipulate a time frame to complete each job.  Work study also specifies the right method of doing the job. Thus it helps enhance production productivity to the desired production level.
This also illustrates Work study principles as applied to the apparel, textile dyeing, knitting and woven industries. Besides, the further topics deal with all of the other techniques, concepts, methods, technology necessary for improving productivity of the apparel garments industry. The total work study articles has been designed bilingual so that diverse categories of people like entrepreneurs, managers, officers, and supervisors can make use of those.   It has been designed to be suitable for novices as well. This is a Teach Yourself type guideline. Examples given those articles are taken from real life circumstances. It will be a source of great joy if this effort of the author can in any way, contribute to improving productivity in apparel industries of this countries.
Let’s read the related articles on work-study and productivity improvements.