Pin holes in prepreg

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Pin holes in prepreg

Author	Message
Matthieu Libeert	Matthieu Libeert posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	fgayford (17/03/2013) Hi Warren Like everything you have to get used to it. I am getting more relaxed using it now. I really like how it sticks to where you put it and the unlimited time you have to work it. I also like how little work it is to prepare the stack. No peelply, no infusion mesh and no resin to mix and infuse. I tried my 3rd test and seeing I have an autoclave I used it. (yes I know it isn't needed or necessary but I used it anyway) I used full 29.9 HG vacuum 212 fahrenheit temp 80 PSI pressure maintained for 6 hours. I was delighted, the part was absolutely perfect and so densely compacted. I think for my 4th test I am going to follow the advice of a previous poster who said to allow the resin to flow at a reduced temperature 50 c for I think he said 2 hours then at full temp. (no autoclave this time) Fred Pictures or didn't happen... Would love to see some pictures, I'll start soon as well, got some samples from the JEC expo to test with but it's not much What type of mould did you use? Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com Edited 12 Years Ago by matthieutje65
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fgayford	fgayford posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 433, Visits: 1.2K	I used a carbon high temperature epoxy mold for the last test but used a polyester mold for the previous test. At 212f I think the polyester mold was OK as well. Fred
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Warren (Staff)	Warren (Staff) posted 12 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8.5K	fgayford (17/03/2013) I think for my 4th test I am going to follow the advice of a previous poster who said to allow the resin to flow at a reduced temperature 50 c for I think he said 2 hours then at full temp. (no autoclave this time) If you are using our Easy-PregSurface Layer PrePreg Carbon then you do not need to allow it to flow at a reduced temperature for out of autoclave processes. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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fgayford	fgayford posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 433, Visits: 1.2K	Thanks Warren I am willing to try different approaches to get the best result. Yes this is what I am using so I guess preheat is not necessary. Oh! congratulations on becoming a "Supreme Being" in such a short period of time. Fred
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Warren (Staff)	Warren (Staff) posted 12 Years Ago HOT Post Details
Group: Administrators Posts: 2.5K, Visits: 8.5K	With most composites ovens, by the time youve opened the doors, loaded the part in and shut it again, the temperature is probably 50 in the air anyway. Then it will take a good hour or so to soak through the part and mould and bring that upto temperature so realistically the pre-preg gets a fairly gradual temperature increase over the first few hours of the cure anyway. Warren Penalver Easy Composites / Carbon Mods - Technical Support Assistant
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carboncactus	carboncactus posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 243, Visits: 1K	What prepreg are you using for the surface, Fred?
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morepower	morepower posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 242, Visits: 1.2K	Fgayford.... What is your lay up process all the way through to curing? Breather stack details, debulk times and ramping when you cure???
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fgayford	fgayford posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 433, Visits: 1.2K	morepower (17/06/2013) Fgayford.... What is your lay up process all the way through to curing? Breather stack details, debulk times and ramping when you cure??? I used the easy preg. First the surface layer and then the backer layer with plastic sheet next . One layer of bleeder over the whole thing. (Just like you see Matt do in the demonstration exactly) I used full 29.9 HG vacuum ( bag clamped off and line cut after an hour drop test, this is the only debulking I do ) 212 fahrenheit temp (no ramping at all) 80 PSI pressure (in my autoclave) maintained for 6 hours. Fred
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carboncactus	carboncactus posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 243, Visits: 1K	fgayford (19/06/2013) I used the easy preg. First the surface layer and then the backer layer with plastic sheet next . One layer of bleeder over the whole thing. (Just like you see Matt do in the demonstration exactly) I used full 29.9 HG vacuum ( bag clamped off and line cut after an hour drop test, this is the only debulking I do ) 212 fahrenheit temp (no ramping at all) 80 PSI pressure (in my autoclave) maintained for 6 hours. Fred Why did you use £100/sqm vacuum bag only fabric if you have an autoclave at hand?
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morepower	morepower posted 12 Years Ago HOT Post Details
Group: Forum Members Posts: 242, Visits: 1.2K	carboncactus (19/06/2013) fgayford (19/06/2013) I used the easy preg. First the surface layer and then the backer layer with plastic sheet next . One layer of bleeder over the whole thing. (Just like you see Matt do in the demonstration exactly) I used full 29.9 HG vacuum ( bag clamped off and line cut after an hour drop test, this is the only debulking I do ) 212 fahrenheit temp (no ramping at all) 80 PSI pressure (in my autoclave) maintained for 6 hours. Fred Why did you use £100/sqm vacuum bag only fabric if you have an autoclave at hand? Exactly.... If you have an autoclave you can use £36/sqm material from SHD or PRF ect... I use there materials for back up with VTF which as £51 sqm inc vat is not cheap but still cheaper than £100 sqm easypreg. I dont have pin holes with VTF at all and using material from SHD for back up saves more money and is compatible with the VTF plus it gives perfect parts. I dont have an Autoclave to use so my parts are vacuum bag and oven only. Edited 12 Years Ago by morepower
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