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Xpreg xc110
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Thomb
Thomb
posted 6 Years Ago
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Hi all,
Im still having some problems with the xpreg in gelcoat moulds. When i use aluminium moulds all is good. When i use the high temp gelcoat moulds i always get a dry finish on the mould side. I tried some longer times and diffrent temperatures but i keep getting these results. I only use breather underneath the mould but that always worked for me and only the bag where it it packed in to press on the carbon. Does anyone have a clue what could be it or what i can try?
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6 Years Ago by
Thomb
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Xpreg xc110
Thomb
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6 Years Ago
Sounds like a temperature ramp problem to me. The aluminium moulds probably have a way higher mass and heat slower than a composite mould. Would probably be worth to stick a temperature probe in ther...
SleepingAwake
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6 Years Ago
Having similar problems myself.i wonder if it's the way the molds heat up due thickness and expansion.
Shaneer22
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6 Years Ago
How did you post cure the mould before putting it into service? And has the mould lost its surface finish at all, or only the components you make from it?
Hanaldo
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6 Years Ago
Would the surface finish affect resin flow.if the surface is Matt finish or satin how would that affect resin flow.
Shaneer22
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6 Years Ago
post cure done just like datasheet, mould is still the same after each release, its just the carbon that is dry and full of pinholes. and always with the 160 high temp epoxy moulding stuff.
Thomb
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6 Years Ago
So a little update, I tried various temps and soaks but the end result is the same, always these dry finishes. I tired a little 5x5cm piece same 2 layers in the same mould and this comes out...
Thomb
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5 Years Ago
What are you using for a bag stack - peel ply, perf film, breather - on top of the laminate? You mentioned using breather under the mold - not sure what you mean... you need a way for the air to...
explorecomposites
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5 Years Ago
XC110 requires an unperforated release film with the breather only on the back of the mould. But unusual, but can confirm it works perfectly like this. Thomb, your test result is very interesting.....
Hanaldo
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5 Years Ago
Yes same prepreg same mould same times.
Thomb
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5 Years Ago
The only time I'd use non-perforated release film with pre-preg is in an autoclave - and there the rules regarding air are very different! You need some way for air and volatile moisture to escape...
explorecomposites
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5 Years Ago
Hi, did you ever solve this issue?
carbon man
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5 Years Ago
Yes i use autoclave now and all good
Thomb
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5 Years Ago
Oh really. I will never have autoclave option. Did you ever solve the pin hole problem on out of auto clave?
carbon man
-
5 Years Ago
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