…just makes you go:
“WTF?!”
I stared at it for 30min, trying to figure out how the heck a 12" tape can split, and weave between itself.
ps: the end not pictured IS intact as a 12" tape, minus the strip that came loose on the right side…and yes, it WAS rolled as a fully intact 12" tape.
shrugs It’s monday.
I also found out I’m one of the hated people at work, since I work with high-temp composites…the kind that the matrix and bagging material gives off such a smell, it pisses people off!
Meh.
I had one of those days yesterday.
First thing I heard: “You got to keep the breather flat on the part when bagging. I had to sand wrinkles out of the parts yesterday.”
My response was: “I did, those wrinkles must have showed up when the layers compacted.” As I know that wrinking in a bagged surface comes from the peel ply wrinkling after the part compacts…not the breather. So my solution was to cut the peel ply into strips vs. one solid piece (been a while since I bagged anything, so it was a duh moment). He disagreed and said that the solution was to hold the bag tight on the surface while the vacuum was being applied??? I nearly lost it.
By the way, that tape looks pretty wicked. We piss our neighbors off to, only I never have to talk to them.
Prepreg parts?
Yeah, I have had some people tell me both. I do my best for keeping the breather flat. Peelply for prepreg is easy…it sticks. I just cut many darts/pieces to get it not stretching.
hold the bag tight…HAHAHA…composite engineer that never laid up anything their life, right?
I just can’t understand how the hell the flat 12" tape, split in so many sections and intertwined itself like that…It didn’t come that way, since it was a perfect roll when I first got it!
Eh, not my material, they are sending more…now I have 5 feet of CF/PEEK to mess with 
Wet layup bagging per Boeings layup manual.
I view peel ply the same way as the earths crust. If you have one solid piece, then the earth compacts/moves, something has to give. Normally that movement creates ridges.
I think the resin ridges are a function of both. Wrinkles in the peel ply, and extra pressure, similar to a caul plate caused by bunched up breather. In my mind, both of those issues are caused by the part compacting. At least last night he saw my lay ups. They were flat, with one tiny exception. It was on a concaved part of the layup, with a sharp, undercut 90 degree edge. They just dont make cloth that will conform to that.
But yeah, Ive bagged nearly 1000 parts by now (not counting infused part). Meanwhile he’s done maybe less than 10% of that. So, its hard to just let random ideas like that roll off my back.
Sounds to me like someone did that on purpose because I doubt theres some kind of sprung energy in that roll that would cuase it to do that on its own.
I figure this for composites. Anything can go wrong, and yes, it will. Even if you have a perfect bag.
I’ve done the same thing so many times, and yet it’s still hit or miss!! Like yesterday pressing 2 CF/PPS plates. One is so warped, it’s unusable…but was done exactly the same way as last time.
shrugs