4
1 Introduction
Proposed textile liner
Fig. 1.1 Schematic diagram of PCM or PWAT materials inside the helmet
fibre in the spinning stage or injected into foams or coated onto the surface of textile
materials. The PCMs inside the microcapsules gradually melt and absorb the heat
that is inside the helmet, thus reducing the temperature inside the helmet. A large
quantity of heat will be absorbed when the temperature reaches the melting point
of the PCM or PWAT material absorbs the heat from the head by evaporation. The
heat generated from the head (metabolic heat), which is retained inside the helmet, is
absorbed by the PWAT material, resulting in a drop in temperature within the helmet.
1.4 Conclusions
This chapter discussed the scope of the study, research concepts, objectives and
hypothesis. This chapter also discussed on the research questions and the scope of
the current research. It is essential to read this chapter before proceeding to other
chapters. The major research gap in reducing the heat stress was the driving factor
to perform this research. An attempt has been made throughout the book to make it
simple so that it is understood easily.