Charles A Bishop C.A.Bishop Consulting Ltd · Directly coat woven/non -woven materials ... Twisted...
Transcript of Charles A Bishop C.A.Bishop Consulting Ltd · Directly coat woven/non -woven materials ... Twisted...
Some considerations on using a different range of flexible
substrates – such as fibres,fabrics, non-woven or foams
Charles A BishopC.A.Bishop Consulting Ltd
www.cabuk1.co.uk
CONSULTING LTD
Options
Use a fine wire included in the twisted fibre bundle Wrap a fine wire around an existing fibre bundle
Coat a monofilament fibre & add to bundleCoat a multifilament fibre bundle
Coat a film – micro-slit & twist to make fibre/yarn
Use any of above to make a fabricDirectly coat a woven or non-woven fabric
Add fine wire to weave – e.g. sensors – switches - connections
Add coating to woven/non-woven fabric or foam – EMI/RFI screening
Directly coat woven/non-woven materials - Ag for medical dressingsDirectly coat woven materials – heat reflecting clothing
Hook: 1.8 Ohm per sqLoop: 1.4 Ohm per sq0.8 Ohm through mated closure
Expected cycle life: 5000 openings/closings
Woven electric fencing tape
substrate
aluminium metalised
Coloured laquer over metal
metalised film microslit Microslit film used as flat thread e.g. as in security
threads for banknotes
If microslit film is twisted it will form a
tight tube or thread/yarn that can be used for sewing of
weaving fabric
Coat film – micro-slit & twist - metallic yarn for sewing
Woven non-woven
The substrate may not be optically denseTo prevent coating the deposition drum a free span deposition process should be considered
Sidrabe
This is not new
Smith & Nephew - Acticoat
Controlled diffusion
Moisture from wound into dressing
Ag ions from dressing to wound
Cu on ripstop nylon
Cra
ck d
ensi
ty
crack onsetstrain(COS)
randomcracking
cracking or fragmentation
becomes saturatedcrack spacing
becomes small wrt2x critical length
Elongation or Strain %
improved coating adhesionmoves COS to higher values
Luminex Spa, Prato, Italy
Dr Tilas Dias. Univ Manchester
iSkinTouch Sensing:
(a) Overview of layers in a touch-sensitive iSkin; (b) sensing without touch contact; (c) projected capacitive sensing of slight touch events; (d) resistive sensing of firm touch events
This fabric touchpad was inspired by the properties of piezoresistive materials to measure both amount of pressure applied through the materials and increase of resistance across distance. It is made by layering piezoresistive material between two conductive layers and using the piezoresistive layer to alternatively measure position and pressure. Instructable >> http://www.instructables.com/id/EJKTF3WGV490JGK/
(doped polyprrol coated fibres)
Dr Tilas Dias Univ Manchester
Electrical properties of metal monofilaments fibers
(a) Twisted metal wire: The metal wire is twisted around the polymer yarn; (b) Metal coating: The polymer yarn is physically/chemically coated with a thin metal layer; (c) Metal fibers: The conductive yarn consists of metal multifilaments
Standard design of copper yarn twisted with
polyester fibers;
SEM image of the polypyrrole coated textile
(a) (b)
Wearable Electronics and Smart Textiles: A Critical Review Matteo Stoppa & Alessandro Chiolerio
Sensors 2014, 14, 11957-11992; doi:10.3390/s140711957
Teijin
Octa ™50% wtof solid
fibre
500 µm
1D
2D
500 µm
R. Xu et al. Extreme Mechanics Letters 1
(2014) 120–126
eg. ultrasoft silicone based adhesive
eg. Lycra
1D system stretched to elastic limit
Experimental and FEA results of a four-island chain
(a) mounted on a substrate with 30% prestrain
(b) after prestrain release
(c) stretched to the elastic limit. The colour denotes the maximum principal strain in metal.
The scale bars are 500 μm.
IMEC-Univ GentCMST Belgium
2013
Electronic devices with extending linking
connections deposited onto rigid substrate then
encapsulated with silicone or polyeurethane and transferred to fabric
laminated with pliable high adhesive
IMEC-UGent - Cmst 2013
Electronic devices with extending linking connections deposited onto rigid substrate then encapsulated with silicone or polyeurethane & transferred to fabric laminated with pliable high adhesive
Vacuum deposition through to
atmospheric deposition
Cooled drum
Protective film
Fabric
Heat transfer coefficient (HTC)between drum & film
HTC between film & fabric
NSN
Cooled deposition drum
unwind
rewind
Chillroll
Chillroll
NS
N
NS
N
Free span deposition
face to face opposingmagnetron sputtering
sources
Fibres may be opened up and then if it is passed through a
plasma the surface may be treated or a coating deposited
If the pressure is increased the mean-
free-path is shorter & the plasma can
penetrate into the centre of the bundle
fibres plasma
Forcespun PEO nanofibres
SEM image of Ag coated Nylon 6 forcespun nanofibers.
D. Mihut et al SVC 55th Ann. Tech Conf Proc, p 725
Schematic of Atomic Layer Deposition (ALD) on fibres
PUMPS
Fibre
Gas 2 input
Buffer zone
Gas 1input
PUMPS
PUMPS
PUMPS
High pressure process –short mfp = greater coverage
Carpeting – clothing – shoe inserts – tyre reinforcement - energy harvesting / sensors
Development of Textiles for Electrical Energy
Generation and Storage(european FP7 project)
Hybrid Piezo Photovoltaic (HPP) films and fibres
Prof.Elias Siores - University Bolton, UKD. Vatansever et al. ‘Hybrid Photovoltaic-Piezoelectric Flexible Device for Energy Harvesting from Nature’ Adv. Sci. Technol. 2013, 77, 297-301
Gyu Cheol Yoona et al, KoreaNano Energy(2015) 12, 547–555
Thank you
Any questions?