1. Introduction
Most of the fibres are hydroscopic and hydrophobic in nature,moisture absorbency divided whether the fabric is suitable for particular puspose.
- Moisture Regain
- Moisture Content
1. 1 Moisture Regain
It is defined as weight of water in a material expressed as a percentage of oven dry weight.
It is denoted by R.
R=W/D*100 Where,W=Weight of water and D=Oven dry weight
1.2 Moisture Content
It is defined as the weight of water in a material expressed as a percentage of total weight.
It is denoted by M.
M=W/(W+D)*100 Where,W=Weight of water and D=Oven dry weight
2. Relationship between Moisture Regain and Moisture Content
M=R/(1+R/100)
Where : M= Moisture Content, R= Moisture Regain
MR and MC values of various fibres:
| Fibre | M.C.% | M.R.% |
| Cotton | 7.34 | 8.5 |
| Silk | 9.91 | 11 |
| Wool | 13.8 | 11 |
| Viscose | 9.91 | 11 |
| Nylon | 3.1 | 4.5 |
| PET | 0 | 0.4 |
| Acetate | 0 | 6.0 |
| Acrylic | 0 | 1.5 |
| Flax | 10.4 | 12.4 |
| Hemp | 10.4 | 12.4 |
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