trex8
Posts: 4665
Joined: Sat Nov 02, 2002 9:04 am

787 Manufacture, Vacuum Bags In Autoclave?

Wed Dec 16, 2009 11:40 pm

 
KELPkid
Posts: 5247
Joined: Wed Nov 02, 2005 5:33 am

RE: 787 Manufacture, Vacuum Bags In Autoclave?

Wed Dec 16, 2009 11:45 pm

You know, my wife made our Thanksgiving turkey dinner in a plastic bag that baked in an oven all afternoon at 350 degrees Farenheit, and the turkey came out delicious (nice and moist), and no one in our immediate family fell sick from poisioning...  Smile The point being that, there are some plastics that can take high temperatures...
Celebrating the birth of KELPkidJR on August 5, 2009 :-)
 
prebennorholm
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Joined: Tue Mar 21, 2000 6:25 am

RE: 787 Manufacture, Vacuum Bags In Autoclave?

Wed Dec 16, 2009 11:51 pm

Dear Trex8, there are some basic CFRP production techniques which you need to study. You can easily find it with google.
Always keep your number of landings equal to your number of take-offs
 
trex8
Posts: 4665
Joined: Sat Nov 02, 2002 9:04 am

RE: 787 Manufacture, Vacuum Bags In Autoclave?

Thu Dec 17, 2009 1:12 am



Quoting Prebennorholm (Reply 2):
Dear Trex8, there are some basic CFRP production techniques which you need to study. You can easily find it with google.

thanks, so do the 787 parts get baked at the low temps I found googling, 120 deg C , or at the much higher ones - some were up to 250+
 
nomadd22
Posts: 1566
Joined: Fri Feb 22, 2008 7:42 pm

RE: 787 Manufacture, Vacuum Bags In Autoclave?

Thu Dec 17, 2009 2:09 am

Nice article, but the first caption "When it's finished, the 787, also known as the Dreamliner will fly further on less fuel than any existing jet" kinda makes you wonder just how stupid a reporter can be.
Anon
 
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Stitch
Posts: 23507
Joined: Wed Jul 06, 2005 4:26 am

RE: 787 Manufacture, Vacuum Bags In Autoclave?

Thu Dec 17, 2009 4:28 am



Quoting Trex8 (Reply 3):
so do the 787 parts get baked at the low temps I found googling, 120 deg C , or at the much higher ones - some were up to 250+

It's actually around 200°C / 400°F for the 787's parts.
 
tdscanuck
Posts: 8572
Joined: Wed Jan 11, 2006 7:25 am

RE: 787 Manufacture, Vacuum Bags In Autoclave?

Thu Dec 17, 2009 4:31 am



Quoting Trex8 (Thread starter):
won't they melt???

Not all plastics melt at low temperatures. Depending on the specific polymer, thermoplastics can go up above oven temperatures, and thermoset plastics don't melt at all (they just eventually burn).

Quoting Trex8 (Reply 3):
thanks, so do the 787 parts get baked at the low temps I found googling, 120 deg C , or at the much higher ones - some were up to 250+

Prepreg aerospace composites normally cure at 350 degF.

Tom.
 
soon7x7
Posts: 2267
Joined: Thu May 04, 2006 10:51 am

RE: 787 Manufacture, Vacuum Bags In Autoclave?

Thu Dec 17, 2009 4:51 am



Quoting Tdscanuck (Reply 6):

Different epoxy compounds together with various fabrics along with the use of the part, its location on the airframe and its intended lifespan all call for different curing rates and temperatures. Some components are CFRP's, others are a matrix of carbon , Kevlar and fiberglass while still, some are just fibreglass. Many different resins along with fillers, aluminum powder, all add to the complexity of cure rates. Composites are such a science that in my personal opinion, its an artform. You also don't need an autoclave to create all the parts...just a mold and vacuum bag. Look up "Heatcons" Website and read about this...its interesting reading. Pretty amazing when you consider you mix two liquids, part A and part B epoxy, impregnate fabric off a roll, bake, and out pops a 787!...although grossly simplistic...thats sort of what is happening...  yes 

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