relentlesspursuit
Aerospace
We're working with AFRPE4 prepreg on Invar42 (700F & 200psi) & having issues with resin continuity at the surface of the tool...basically, the prepreg is leaving behind large amounts of resin flashing. Any advice?
Eng-Tips is the largest engineering community on the Internet
Intelligent Work Forums for Engineering Professionals
-
Congratulations waross on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!
questions about processing AFRPE4 prepreg 1
- Thread starter relentlesspursuit
- Start date
- Status
btrueblood
Mechanical
Clean the tool. Apply a mold release compound.
- Thread starter
- #3
relentlesspursuit
Aerospace
This has been done, we're using a typical naphta based semi-permanent mold release system; 4 applications of sealer & 2 applications of release, recoating release between parts. The issue is the prepreg outgasses amic acid, which is oxygenated. Oxygenated materials are particularly destructive to the polymers used in semi-permanent mold release systems. My hope is to gleen insight in a work around...
- Thread starter
- #4
-
1
- #5
patprimmer
New member
Choose a mould release resistant to amic acid. The prepreg manufacturer and the various mould release manufacturers should both offer technical assistance.
We do not have a team of specialists in every conceivable application sitting by just waiting to swiftly answer any question for free.
You seem to have a different use of the word flashing to my use. I suspect you use it to describe what I would call resin transfer or mould deposit.
If so btrue was correct.
Clean mould and (appropriate) mould release.
The mould surface finish and processing parameters like time, pressure and temperature may also be important.
Is this a new mould or have you moulded it without problems in the past. If it was OK but is not now what changed.
Why do I need to ask so many questions in an attempt to answer? The need to ask so many questions may indicate a reason for the lack of instant response.
The fact that this is the many of us are in different time zones may also contribute.
The fact that we all have a day job and a life means we don't always log on and read every post every day.
Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &
for site rules
We do not have a team of specialists in every conceivable application sitting by just waiting to swiftly answer any question for free.
You seem to have a different use of the word flashing to my use. I suspect you use it to describe what I would call resin transfer or mould deposit.
If so btrue was correct.
Clean mould and (appropriate) mould release.
The mould surface finish and processing parameters like time, pressure and temperature may also be important.
Is this a new mould or have you moulded it without problems in the past. If it was OK but is not now what changed.
Why do I need to ask so many questions in an attempt to answer? The need to ask so many questions may indicate a reason for the lack of instant response.
The fact that this is the many of us are in different time zones may also contribute.
The fact that we all have a day job and a life means we don't always log on and read every post every day.
Regards
Pat
See FAQ731-376 for tips on use of eng-tips by professional engineers &
for site rules
materialsliz
Aerospace
Have you looked into a nickel teflon coating on your mold? It's considered a permanent mold release rather than a semi-perm that you say you are currently using.
- Status
Similar threads
- Locked
- Helpful tip
- Locked
- Helpful tip