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Mike - Textiles - Coggle Diagram
Mike - Textiles
Ventile Principle
Long cotton fibres, tightly woven in standard weave, small pores
when dry, porosity in weave allows fabric to be breathable :sweat_drops:
When wet, fibres swell and reduce porosity :no_entry: :hole:
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Pore sizes - dry 10um, wet 3-4um
Tried making it with synthetics, bit shit as not as absorbant
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Lycra production
- Disolved in solvent, filtered and pasturised
- Passed through spinneret :shower:
- Shape stabilised with hot gas to remove solvent :cloud:
- Filaments woven to create fibre
PTFE Polymer (GORTEX)
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Porosity comes from stretching rapidly at 300C (Tm is 327C), 400%/second
Biaxial or uniaxial stress, biaxial creates thin films to be turned into laminate fabric
Pore size 3-4um, water vapour can pass through but not water droplets
V hydrophobic so water vapour doesn't condense inside and water droplets will bead on surface :sweat_drops:
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Hydrophilic Membranes
Liquid water cannot pass through, water vapour passes through via sequential transient hydrogen bonding
STHB where polymer chains have polar groups that can hydrogen bond (-OH hydroxyl, -NH2 amine, -O- ether), water is passed along the chain
Ether links are incorporated using a polyester, hydrogen bonding units are spaced using PU (block co-polymer)
Co-polymer blocks show different properties, PU segment is hard and PEO is soft. Ideal is 40-60%PEO and PEO segment length of 12-45 repeat units
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