Making Unidirectional Fabric Plies
Making Unidirectional Fabric Plies
(OP)
Hello,
I am a research student working on fabricating natural fiber composites using jute. Since unidirectional jute fabric is largely unavailable, I have been tasked with making it using jute yarn. However, I have been having some difficulty in successfully making unidirectional fabric that will stay together. So far I have experimented with tightly wrapping the yarn around a glass plate and painting the yarns with epoxy, but the yarns tend to split apart upon removal from the plate.
Does anyone here have any experience making unidirectional fabric from yarn? And if so do you have any suggestions?
Thank you very much for any advice you can give
I am a research student working on fabricating natural fiber composites using jute. Since unidirectional jute fabric is largely unavailable, I have been tasked with making it using jute yarn. However, I have been having some difficulty in successfully making unidirectional fabric that will stay together. So far I have experimented with tightly wrapping the yarn around a glass plate and painting the yarns with epoxy, but the yarns tend to split apart upon removal from the plate.
Does anyone here have any experience making unidirectional fabric from yarn? And if so do you have any suggestions?
Thank you very much for any advice you can give





RE: Making Unidirectional Fabric Plies
In your case you have none. So the only thing holding your fabric together is the resin.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Making Unidirectional Fabric Plies
RE: Making Unidirectional Fabric Plies
In the UK in the 1960s, a company used to make a unidirectional pre preg by filament wrapping fiberglass and resin around a large cylinder, they then B staged the material, sliced through the wrap, and allowed the sheet to fall onto a flat plate for further processing.
B.E.
The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor
RE: Making Unidirectional Fabric Plies
RPstress: I apologize for violating the site rules, thank you for giving your advice still. What kind of information are you interested in on the natural fibers? I would be happy to share what I know.
RE: Making Unidirectional Fabric Plies
My info on Jute fibres is summarised as:
...................................................................................................Specific..Specific...U*1/3 theoretical
.........Fibre.................................Failure..Density....Fibre Φ.........................strength..stiffness..ballistic resistance
Fibre....type..............UTS (MPa)..E (MPa)..strain...(kg/m^3)..(µm).....Notes...................(m).......(km)
Jutt.....Natural jute......800........30000....0.018....1460.......200.....~0.35–1.5 $/kg..........55900.....2100.......281.7
Any info which conflicts with this is most welcome as is anything else interesting. As you can see I'm biased to the mechanical propereties and I've selected values which are representative rather than ranges, which possibly I should reconsider. Another issue is perhaps susceptability to environment factors should be an issue I should document. Also I've got no feel for how well natural fibres adhere to the matrix; we have a good idea for carbon, glass, Kevlar, UHMPE, etc., but I've got no hints even, for the naturals, not even an interlaminar shear strength which might give a clue. I've also got no data on how well laminates made with them edsist damage and impact. I've put in the U*1/3 value but I've got no data at all on how well natural fibres respond to ballistic impacts. Other fibre data which I collect is ratio of tensile properties to compressive (basic fibre compressive is hard to find, though 'elastica loop test' data seems to have some validity). I also collect what information I can find on laminate properties, although many of these are mainly dependent on matrix resin (I document open hole compression where it's available).
RE: Making Unidirectional Fabric Plies
Then you will have all the time to adjust your fibers and your resins
Maybe place fibers and resin between 2 glass plates and curing with the UV when you are satisfied
Make yourself a little black room and a red light to work
May need some wax on the glass plates
I never use UV curing resin but it's just an idea