BRAIDING.ppt

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1. BRAIDING

2. BRAIDING
Braiding,intextiles,machineorhandmethod
ofinterlacingthreeormoreyarnsorbias-cut
clothstripsinsuchawaythattheycrossone
anotherandarelaidtogetherinadiagonal
formation,forminganarrowstripofflator
tubularfabric.

3. Normallythediagonalbraidedanglerangeis
30
o
-80
o

6. Main characteristics of braid:
Yarnsareinterlacedbothdiagonallyand
lengthwise.
Braidisstretchyandeasilyshaped.
Flatorthreedimensionalbraidisusedfor
trimandindustrialproducts.

7. Types braid fabrics:
Two dimensional braiding.
Three dimensional braiding.

8. •so braids are divided into two types, considered as
2 dimensional:
Circular/roundbraids,tubularisformwhichmaybe
holloworhaveacentralcoreofsomematerial.
Flatbraidsintheformofstripsornarrowflattapes.
3dimensionalbraiding:
Itisrelativelynewandwasmainlydevelopedfor
compositestructures.

9. Materials used:
•Cotton
•Jute
•Nylon
•Glass
•Rubber
As well as from metal threads, tinsel, straw,
wire or leather.

10. BASIC PRINCIPLE:
1.Interlace the left two yarns , where the outer left goes to next one.
2.Interlace the right two yarns , where the right yarn goes to left next nearest yarn.

11. CIRCULAR BRAIDS
Circularbraiderscanbeadaptedtomake
complexshapesbyoverbraidingacontoured
mandrelandadjustingtheprocessparameters
Circularbraidsareformedholloworarounda
centrecore

12. Circular braiding mechanism
•Acircularbraidingmachineconsistsoftwo
setsofanevennumberofspoolscontaining
thebraidingyarns
•Onesetrunsclockwisearoundthecentreof
themachineandothersetturnincounter-
clockwisedirection
•Whilerevolvinginoppositedirectionsthe
carriersaredivertedtopassalternatelyinside
andoutside(underandover)oneanother

13. Cont.....
•Theclockwiseandcounterclockwisepaths
causethetwosetsofyarnstointersectthus
producingatubularbraid
•Theyarnsarecollectedabovethehubofthe
circulartrackinwhichthebobbinstravel
•Circularbraidersarecalledas“maypole
braiders”

14. THESIZEOFTHEBRAIDISGOVERNEDBYTHE
FOLLOWINGFACTORS
•Incircularbraidershaveevennumberof
carriers
•Thediameterofyarn
•Theno.ofyarnsinendspercarrier
•Theno.ofyarnsperunitlength

15. PRINCIPAL OF MAYPOLE BRAIDING
MACHINE
•Inindustrialbraidingthe
machineelementiscalleda
carrier
•Andthepathofthecarrieris
calledtrack
•Ifthemotionofthecarriersis
analysedcarefully
•Ifthecarriersinonedirection
arefollowingthesametrack
andifthecarriersarein
oppositedirectionfollowthe
oppositetrack

16. •Thetrackdetermines
thepathofthemotion
•Thecarriersaremoved
forwardsbythehorn
gears
•Everyhorngearisa
discwithseveralcuts
(slots)wherethe
carrierfootfits
•Eachhorngearis
mountedontoashaft
which has
correspondingcarrier

17. •Oncethecarrierstarttheirmotionstheyarn
interlacetogetherandbuildthenextpieceof
braidatthebraidingpoint
•Thedistancebetweeneachcarrierandthe
braidingpointdoesnotremainconstant
duringthebraidingprocess
•Yarnlengthcompensationmechanismhasto
beusedoneachcarrier
•Becausecarrierandthebraidingpoint
changes

18. TAKE-UP SPEED
Sincethespeedofthecarrierisconstantthe
opennessofthefabricischangedbychanging
thetake-upspeedofthefabric
TYPES OF CIRCULAR BRAIDING
MACHINE
•This is for extra thin braids
•Production 1-6 mm diameter
•48 carriers

19. •24 carriers
•300 rpm
•The production of braids with 1-6 mm diameter

20. •48 carriers
•330 rpm
•Production monofilament sleeves
upto 15 mm diameter

21. Flat braiding:
•Inthiscase,atthefirststepallleftpairshave
interlaced.So,theleftgoesovertheright.
•Atthesecondstepallrightpairshave
interlaced.So,therightgoesovertheleft.
•Theysameprincipleisimplementedfor
certainmachineresultingproductisflatcross
sectionedbraidisknownasflatbraid.

22. Flat braiding is possible for both odd and even no of yarns.
In case of 6 yarns, yarns both left and right wait, while
using odd no of yarns, only one yarn per cycle.

23. Tubular braid:
•Usinganevennoofpassagearoundthecircle
toproductionoftubularbraids.
•Sequenceofstepsissameoftheflatbraiding.

24. The easiest way to produce tubular braids by use of
special holes in the middle and then yarn to the
circumferential.

25. Principle construction of may pole
braider m/c:

26. 3D BRAIDING
It is a new generation machine and computer controlled.
They carrier can changes it motion automatically.
It is used for gasket reinforced composites.

27. End uses:
•Industrial belts.
•Ropes.
•Electrical wires and cables.
•As reinforcement for air craft propellers.