Wrinkles when vacuum-bagging :(


Author
Message
brummelisa
brummelisa
Supreme Being (140 reputation)Supreme Being (140 reputation)Supreme Being (140 reputation)Supreme Being (140 reputation)Supreme Being (140 reputation)Supreme Being (140 reputation)Supreme Being (140 reputation)Supreme Being (140 reputation)Supreme Being (140 reputation)
Group: Forum Members
Posts: 20, Visits: 144
Hi,

I just made a toptube on a bike-frame. The tube was made from a plug that I vacuum-bagged.

I noticed that I have got a couple of "bumps" that I wonder how I can remove and to prevent for happening next time.

Can I just sand it off (I will add several layers on top of it)?

I wrapped the CF in two layers and was very careful that I didn't had any wrinkles. I used peel-ply and breather.

My concern is how can I assure not to have wrinkles when I'm vacuum-bagging? I mean when the vacuum is applied I don't have super-control if the CF wrinkles (since I can't see it through the breather).

Should I only wrap one layer at a time? (I intend to wrap 6-10 layers depending on which part I'm making.

Note, that I don't use a mold, but a plug and you can see the wrinkles in the attachment

/ Marcus
Attachments
bild 2.JPG (680 views, 1.00 MB)
progetto
progetto
Forum Member (44 reputation)Forum Member (44 reputation)Forum Member (44 reputation)Forum Member (44 reputation)Forum Member (44 reputation)Forum Member (44 reputation)Forum Member (44 reputation)Forum Member (44 reputation)Forum Member (44 reputation)
Group: Forum Members
Posts: 6, Visits: 231
Can you use shrink tape instead of vacuum?
AlpacaChris
AlpacaChris
Junior Member (16 reputation)Junior Member (16 reputation)Junior Member (16 reputation)Junior Member (16 reputation)Junior Member (16 reputation)Junior Member (16 reputation)Junior Member (16 reputation)Junior Member (16 reputation)Junior Member (16 reputation)
Group: Forum Members
Posts: 2, Visits: 13
Marcus - 

Just to clarify, is the peel-ply and breather being applied on the finish side of the tube?  i.e. the external finish of the tube is in contact with the peel-ply.

Chris.
Zorongo
Zorongo
Supreme Being (276 reputation)Supreme Being (276 reputation)Supreme Being (276 reputation)Supreme Being (276 reputation)Supreme Being (276 reputation)Supreme Being (276 reputation)Supreme Being (276 reputation)Supreme Being (276 reputation)Supreme Being (276 reputation)
Group: Forum Members
Posts: 40, Visits: 330
Time ago I did any composite tube trials.

The problem is that before applying vcuum, you have a certain thickness and outer diameter without any wrinkle. OK. BUT when applying vacuum and consolidating the cloths, the thickness and so the outer diameter, will decrease. Then you´ll have a cloth excess that under vacuum will end creating a wrinkle.

This will be worst when more plyes compacted.

Lately I've done a few tubes with shrink tape with nice results. Easy, cheap and flexible process for a "not highly stressed part".
Edited 12 Years Ago by Zorongo
GO

Merge Selected

Merge into selected topic...



Merge into merge target...



Merge into a specific topic ID...




Similar Topics

Reading This Topic

Explore
Messages
Mentions
Search