+x

 

f1rob - 12/22/2018 11:39:53 AM

There isn't such a thing as a "autoclave" resin system.
Thou resin can be applied to carbon to make it 
OOA material,it's the same resin
Most systems are the same an as Steve said experiment
"Most" will start to flow at 30,most start to "gel" at 80 but will take 5/10 minutes to actually take a set at that temp
Cook it long enough at 80 an it will cure but not have the best tg 
Most materials will be 120-130 cure
Final hr at 135 usually covers all bases
Remember KISS lots of people doing lots of really long complicated programs to cure their materials and it's not needed
You have 3 states with your resin
Liquid, gelled an cured so gently ramp up to just below your gel temp
1/2 hr dwell,if the resin hasn't done what it needs to in 30 mins it Isn't ever doing it
Once your dwells over an your temp rises an you cross the gel point after a few minutes your resin isn't going to flow any more so any more dwells are totally pointless
Up to your cure temp an hold

P.S sorry Steve I will give you a bell an head over one evening but soon as I got your number we have had a mental few weeks at work an no spare time,hardly had a chance to pop on here

+x

 

Steve Broad - 12/23/2018 10:32:05 AM

+x

 

f1rob - 12/22/2018 11:39:53 AM

There isn't such a thing as a "autoclave" resin system.
Thou resin can be applied to carbon to make it 
OOA material,it's the same resin
Most systems are the same an as Steve said experiment
"Most" will start to flow at 30,most start to "gel" at 80 but will take 5/10 minutes to actually take a set at that temp
Cook it long enough at 80 an it will cure but not have the best tg 
Most materials will be 120-130 cure
Final hr at 135 usually covers all bases
Remember KISS lots of people doing lots of really long complicated programs to cure their materials and it's not needed
You have 3 states with your resin
Liquid, gelled an cured so gently ramp up to just below your gel temp
1/2 hr dwell,if the resin hasn't done what it needs to in 30 mins it Isn't ever doing it
Once your dwells over an your temp rises an you cross the gel point after a few minutes your resin isn't going to flow any more so any more dwells are totally pointless
Up to your cure temp an hold

P.S sorry Steve I will give you a bell an head over one evening but soon as I got your number we have had a mental few weeks at work an no spare time,hardly had a chance to pop on here

I meant carbon fibre composite designed for autoclave :-) If the resins are the same, what is the difference between OOA and Autoclave composites? In order to use the autoclave composite I had to debulk after each layer of material was added and use the up to 80, hold for 30 minutes then up to 120 and hold for 2.5 hours method. It also had a 38% resin as opposed to 42%

No problem, whenever you can make it will be fine by me as I am almost always here :-)

+x

 

f1rob - 12/24/2018 9:59:32 AM

+x

 

Steve Broad - 12/23/2018 10:32:05 AM

+x

 

f1rob - 12/22/2018 11:39:53 AM

There isn't such a thing as a "autoclave" resin system.
Thou resin can be applied to carbon to make it 
OOA material,it's the same resin
Most systems are the same an as Steve said experiment
"Most" will start to flow at 30,most start to "gel" at 80 but will take 5/10 minutes to actually take a set at that temp
Cook it long enough at 80 an it will cure but not have the best tg 
Most materials will be 120-130 cure
Final hr at 135 usually covers all bases
Remember KISS lots of people doing lots of really long complicated programs to cure their materials and it's not needed
You have 3 states with your resin
Liquid, gelled an cured so gently ramp up to just below your gel temp
1/2 hr dwell,if the resin hasn't done what it needs to in 30 mins it Isn't ever doing it
Once your dwells over an your temp rises an you cross the gel point after a few minutes your resin isn't going to flow any more so any more dwells are totally pointless
Up to your cure temp an hold

P.S sorry Steve I will give you a bell an head over one evening but soon as I got your number we have had a mental few weeks at work an no spare time,hardly had a chance to pop on here

I meant carbon fibre composite designed for autoclave :-) If the resins are the same, what is the difference between OOA and Autoclave composites? In order to use the autoclave composite I had to debulk after each layer of material was added and use the up to 80, hold for 30 minutes then up to 120 and hold for 2.5 hours method. It also had a 38% resin as opposed to 42%

No problem, whenever you can make it will be fine by me as I am almost always here :-)

OOA just has the resin applied a different way
"Traditional" pre preg goes through a resin bath,the cloth is totally saturated an then it goes through essentially a giant mangle.
That squeezes out a lot of the resin an depending how it's set gives you your resin percentage.
OOA is "hot rolled" the material goes into the machine dry,the resin is squeezed out in a measured way (to get your resin percentage) onto a warm roller which the carbon passes under.
As it compresses the carbon the resin film on the roller transfers to the carbon.
The idea being you already have a good resin a surface when you lay up,an any air escapes a lot easier through the dry fibres as the resin bleeds through to the back.
There is no "autoclave" pre preg
Debulking the 1st ply is good practice but after that putting 4/5 down without a debulk fine