We hereby declare that this project report has been prepared by us under the supervision of Tanvir Ahmed Chowdhury, Assistant Professor, Department of Textile Engineering, Faculty of Engineering, Daffodil International University. We also declare that neither this project nor any part of this project has been submitted elsewhere for the award of any degree or diploma. This project report has been prepared by MD: Ashikur Rahman (ID amp; Ataur Rahman (ID has been approved in partial fulfillment of the requirement for the degree of BACHELOR OF SCIENCE IN TEXTILE ENGINEERING).
Firstly, we express our gratitude to Almighty Allah for His divine blessing enabling us to complete this project successfully. We are grateful to our supervisor Tanvir Ahmed Chowdhury, Assistant Professor, Department of Textile Engineering, Faculty of Engineering, Påskelilje International University. Deep knowledge and great interests of our supervisor in textile dyeing and finishing influenced us to carry out the project work.
His endless patience, expert guidance, constant encouragement, energetic supervision, constructive criticism, valuable advice, reading many inferior drafts and correcting them at all stages made it possible to complete this project. Head (Management), Department of Textile Engineering, Faculty of Engineering, Daffodil International University for his kind help in finishing our project report. Sumon Mozumder, Assistant Professor, Department of Textile Engineering, Daffodil International University, for providing the necessary information to complete the report on time.
This paper tries to find out the main changes in the characteristics of cotton knitted fabric before dyeing and after dyeing.
Introduction
Objectives
Introduction
5 In this exploration we are going to observe that what type of physical changes are shown in different types of cotton knitted fabric after dyeing process. For that, we have selected four types of cotton knitted fabric (Single jersey, Lycra single jersey, Slub single jersey and (2x2) Lycra Rib) and will be dyed with dark and light shade. After the dyeing process, try to find out the changes in the physical properties of the following substances.
A gray cotton knit fabric will lose its weight and become whiter after the cleaning and bleaching process. Because at the moment of the cleaning and bleaching process, any kind of dust, dirt or grease, natural impurities (oil, fat, wax) and natural color are removed. After going through these processes, the fabric will be more hydrophilic and at that time the dyeing process will be done perfectly and uniformly.
After dyeing process fabric GSM, WPI, CPI will increase because fabric absorbs dyes and other chemicals.
Sample preparation for dyeing
Specification of Knitting machine
Specification of scouring and bleaching machine
Unless heat curing is complete, Lycrat attempts to compress the fabric lengthwise and widthwise between the previous. In these two fabrics, heat treatment was given to control the dimensional stability and uniform distribution of the lycra throughout the fabric. After heat curing, we carried out the pre-treatment process in a DILMENLER dyeing machine with mass production.
Recipe of pretreatment
After finishing the pre-treatment process, we collected pre-treated sample and went for dyeing in laboratory dye machine. All fabrics are dyed with the same recipe for light shade and again all fabrics are dyed with the same recipe for dark shade.
Specification of dyeing machine
Materials
Dyeing mechanism
Dyeing Recipe
Recipe Calculation
Then all the fabric samples were slightly moistened with plain water and placed on the pot. Then we drained the bath and first washed normally, then hot and again normal washing.
GSM Measurement
Measurement of Shrinkage
We measured the length and width of the sample after washing with the following markers and recorded it. Shrinkage% = {(Length before washing - length after washing) × 100}/Length before washing Formula of calculation of fabric growth%.
Stitch length Measurement
First take 10 cm x 10 cm fabric from the sample and count the number of ridges in 10 cm samples. Then five full length yarns were taken and to remove the curl formation of the yarns they were stretched. We then measure the length of those 5 yarns using scale and then calculate the average length of the sample yarns.
Abrasion resistance
Measurement of WPI, CPI
- Introduction
- Analysis of GSM
- Analysis of shrinkage%
- Analysis of stitch length, WPI, CPI
- Analysis of stitch length
- Analysis of WPI
- Analysis of CPI
- Analysis of Abrasion resistance (%)
- SAMPLE ATTATCHMENT
- Conclusion
We dyed our samples in light shade and deep shade using the same recipe for each fabric type. We see that GSM is increased to color and color with deep shade GSM is more than light shade GSM. This happened because color samples in deep shade absorbed more dye than light shade paint.
Although we painted all four of our samples with the same (recipe, temperature, atmospheric condition), we see that there are differences in their GSM. We see that our four samples different in their construction material and painted with the same recipe result in different rates of shrinkage. WPI is increased because at the time of dyeing we use different chemicals and dyes.
The CPI is increased because we use different chemicals and dyes in dyeing. To do this, we tested four types of cotton knit fabric with light and deep shade (Lycra single jersey, single jersey, Single jersey slub, 2x2 Lycra Rib). And we noticed that after going through the dyeing process, they change in GSM, WPI, CPI, stitch length, shrinkage and abrasion resistance.
We dyed our sample in the same recipe and in the same atmospheric conditions, but the changes in the mentioned characteristics are not the same due to the variation in the construction and structure of the fabric.
