Strange pattern on frame

[TheDoctor]

The different types are purely cosmetic (gross oversimplification alert).
Anything carbon is made from a few layers of unidirectional carbon, each in different directions. Like the grain in plywood, where each layer is at right angles to the next one. You then apply a cosmetic top layer, like the veneer on chipboard furniture.

 

[Andywinds]

Well I've learned something new today, thanks.

The different types are purely cosmetic (gross oversimplification alert).
Anything carbon is made from a few layers of unidirectional carbon, each in different directions. Like the grain in plywood, where each layer is at right angles to the next one. You then apply a cosmetic top layer, like the veneer on chipboard furniture.

 

[ayceejay]

I just did a quick google search and found this http://miracletrade.en.alibaba.com it seems that this type of weave is also used in knife making so I don't think you have any worries

 

[Globalti]

If you bear in mind that the carbon tube is formed by a long internal bladder being inflated and forcing the carbon weave into the mould, you'll understand that pattern. It will then have been rubbed down, lacquered and re-lacquered.

 

[Andywinds]

So does the carbon sort of melt and leave that pattern? I've seen some carbon finished where it looks like more of a weave effect.

If you bear in mind that the carbon tube is formed by a long internal bladder being inflated and forcing the carbon weave into the mould, you'll understand that pattern. It will then have been rubbed down, lacquered and re-lacquered.

 

[Globalti]

No the carbon is a coarsely-woven cloth with a warp and weft. It is soaked in resin and forced into the mould under high pressure while the resin goes off. The resin forms the shape of the bike but the embedded carbon cloth gives it the incredible structural strength, just like reinforced concrete. Different weaves of carbon will create different patterns, which we aren't accustomed to seeing because most frames are painted.

Unfortunately the resin tube walls aren't very robust against point loads and impacts and are crushed relatively easily when compared to their structural strength, which is why some people still distrust carbon. But rewind about 30 years and you'll find people fretting about the fragility of very thin-walled steel tubes.

 

[Andywinds]

Right ok, so really carbon on it's own is a thread or sheet of cloth like material?

No the carbon is a coarsely-woven cloth with a warp and weft. It is soaked in resin and forced into the mould under high pressure while the resin goes off. The resin forms the shape of the bike but the embedded carbon cloth gives it the incredible structural strength, just like reinforced concrete. Different weaves of carbon will create different patterns, which we aren't accustomed to seeing because most frames are painted.

Unfortunately the resin tube walls aren't very robust against point loads and impacts and are crushed relatively easily when compared to their structural strength, which is why some people still distrust carbon. But rewind about 30 years and you'll find people fretting about the fragility of very thin-walled steel tubes.

 

[Globalti]

 

[Smokin Joe]

Very nice. I wonder if they'd make me a suit?

 

[Globalti]

This would have revolutionised warfare in the era of knights in armour.

 

[bonsaibilly]

If you bear in mind that the carbon tube is formed by a long internal bladder being inflated and forcing the carbon weave into the mould, you'll understand that pattern. It will then have been rubbed down, lacquered and re-lacquered.

So this runs counter to the doctor's advice, so which is correct?
BB

 

[Citius]

Right ok, so really carbon on it's own is a thread or sheet of cloth like material?

Think fibreglass, but with a more up-to-date fibre...

https://en.wikipedia.org/wiki/Fiberglass
https://en.wikipedia.org/wiki/Carbon-fiber-reinforced_polymer

 

[Gravity Aided]

This would have revolutionised warfare in the era of knights in armour.

At Agincourt, when it rained, everyone's armor would have melted.

 

[TheDoctor]

If you bear in mind that the carbon tube is formed by a long internal bladder being inflated and forcing the carbon weave into the mould, you'll understand that pattern. It will then have been rubbed down, lacquered and re-lacquered.

So this runs counter to the doctor's advice, so which is correct?
BB

The tube is made up of layers, then formed. Where I work, things are made on the outside of a mould, but it's the same principle.

 

[bonsaibilly]

The tube is made up of layers, then formed. Where I work, things are made on the outside of a mould, but it's the same principle.

But your previous post said it was purely cosmetic like a veneer topping whereas globalti's says it is the result of the material being pressed into the mould. It can't be both.