Three layered assembly with a
needle punched fabric contains 37.5% of SAF and remaining polyester, with basis
weight of 210 g/m2 as absorbent core was used in the experiments.
To study the effect of different
SAF content, basis weight and thickness of the absorbent core on protective
performance thermal bonded nonwoven structures were made from the following
design matrix as shown in Table 1. To prepare the thermal bonded nonwoven
structures 20% low melt polyester fibres were blended with the normal Polyester
and SAF. Cross-lapped web of different basis weight were made from DILO needle
punching machine. The cross-lapped web was then thermally bonded in compression
moulding machine at a temperature of 130C for 20 minutes to obtain the final
structure. To achieve different thickness metal frames of different thickness
were used in between the top and bottom heating plate.
Table 1: Design matrix for
designing the absorbent core.
Super absorbent fibres of 9 denier
and staple length of 52 mm were used. The three layer evaporative cooling
fabric was made by stitching the outer layer, absorbent core and inner layer
together on a lockstitch machine. Sewing thread used was of 270/2 denier and
stitch density was kept to 3 stitches/cm. Sample size of 18 cm12cm was used
for testing. The structure of the three layer evaporative cooling fabric
assembly is shown in Figure 2.