Cotton/Lycra core-spun single jersey knitted fabric
The loop shape factor is not constant for knitted fabrics using core-spun yarn and depending on the structure, the loop shape factors are significantly different between the loop length and between different relaxed states,
The loop shape factor is not constant for knitted fabrics using core-spun yarn and depending on the structure, the loop shape factors are significantly different between the loop length and between different relaxed states, find KP Kathirvel and Dr T Ramachandran.
Lycra/Cotton garments find numerous applications in knitwear industry and in this study the core-spun yarn is used with Lycra in the core and cotton forming the sheath. The advantage of using core-spun instead of plaiting technique where cotton and Lycra are fed separately is that the loop formation of core-spun yarn is better than plaited yarn. The ability of the core-spun knitted fabric to maintain the dimensional stability and loop shape factor is studied for three different structures with 3 different loop lengths and the results are discussed in this study.
Statistical analysis of loop shape factor between loop lengths and different relaxed states using 2 way ANOVA (within structure)
Popcorn
Hypothesis 1: There is no significant difference in the loop shape factor between relaxed states.
Hypothesis 2: There is no significant difference in the loop shape factor between loop lengths.
F ratio between relaxed states is 6.3 and F ratio between loop lengths is 21.2.
The calculated F value for both the conditions was more than the table value and hence both the hypothesis is rejected.
Double airtex
Hypothesis 1: There is no significant difference in the loop shape factor between relaxed states.
Hypothesis 2: There is no significant difference in the loop shape factor between loop lengths.
F ratio between relaxed states is 0.45 and F ratio between loop lengths is 99.6.
The calculated F value between relaxed states was less than the table value and hence hypothesis 1 is accepted and the calculated F value between loop lengths was more than the table value and hence hypothesis 2 is rejected.
Honeycomb
Hypothesis 1: There is no significant difference in the loop shape factor between relaxed states.
Hypothesis 2: There is no significant difference in the loop shape factor between loop lengths.
F ratio between relaxed states is 0.19 and F ratio between loop lengths is 1.02.
The calculated F value between relaxed states and between loop lengths was less than the table value and hence both the hypothesis is accepted.
Regression analysis to find the relationship between loop length and loop shape factor
Results and discussions
- The loop shape factor is not constant in different relaxed states and different loop lengths for single jersey structures made of core-spun cotton lycra yarn.
- There is a significant difference in loop shape factor between different relaxed states and between different loop lengths for popcrn structure..
- There is no significant difference in the loop shape factor between relaxed states and there is significant difference in the loop shape factor between loop lengths for double airtex structure..
- There is no significant difference in the loop shape factor between relaxed states and between loop lengths for honeycomb structure..
- The Bursting strength of the samples reduces as the loop length is increased in DRS and compacted state..
- The Thickness of the samples increases as the loop length is increased in DRS and compacted state..
- There is shrinkage of the sample in the lengthwise direction of 6 to 10 per cent. There is elongation of the sample in the widthwise direction of 10 to 12 per cent.
Conclusion
