Author : Salvia Rahman, Shamima Akter Smriti and M.S Fahmida Siddiqa

Total different four types of different knitted fabrics (single jersey, single lacoste, rib and 2 thread fleece fabric) with three different GSM for each were taken for observing their thickness, relative porosity and air permeability. Relative porosity was measured by suitable equation (discussed on method) and thicknesses along with air permeability were generated by AMES thickness gauge and MAC air permeability tester respectively. From the details analysis it was explored that with the decrease of stitch length and count fabric thickness increases and the reason is decrease of stitch length and count causes GSM increment. Another observation confirms the relative porosity and air permeability reduction with the decrease of stitch length and yarn count for every fabric. Most interesting result was seen for relative porosity and air permeability which is single lacoste & two thread fleece fabric have lower relative porosity value than single jersey fabric but shows higher air permeability as it is known that air permeability and relative porosity is proportional to each other. All these happened for the presence of tuck loop in single lacoste and two thread fleece fabrics which cause irregularity in density of fabric which is not considered in the relative porosity equation. So it can be declared that relative porosity equation is not applicable for those knitted fabrics where tuck in existing.

Keywords: Thickness, Air permeability, relative porosity

Article published in International Journal of Current Engineering and Technology, Vol.6, No.1 (Feb-2016)