Can anyone explain me what exactly is a break zone? maybe some pictures of it?
What advantages it provide? whats is the reason of placing break zone?
I also need to know it, what exactly the advantages of break zone ?
I think in the context that someone mentioned it on your other post was with respect to how far/much of the surface is covered by flow media.
What I believe they were saying is that cover less than the entire surface, so even if the resin races across teh media it will slow down as it reaches the end of the mesh but still has not infused the entire lenght of the the part. THus the resin will slow down here in it’s forward direction to ward the vac line but still be infusing thru the thickness of your part.
Another thing you could try to allow more resin inot your think stack is to do a double layer of flow mesh and orient the second one 45degrees to the first. BUT really important to have a break zone like I described above since the resin can actually run faster and lead to more problems with lack of full depth of saturation. I always leave infusion mesh short by a few inches at least, but I gauge how short based on part thickness, overall size and resin characteristics.
also, i sometimes dont even put flow media over areas of sharp curvatures or places that I think may be high risk for some bridging(typically I don’t get bridging but it’s a relative term so all sharp radii are subject to a bit of gap where resin can race) again to act as a bit of a break
I think you may be referring to a brake zone or area with infusion as mentioned above.
For me this is the area right at the edge of the infused part where I have only 3-4" of peel ply in contact with the vacuum channel/line. The vacuum keeps pulling but the resin is very slow to travel through the peel ply as it is so thin.
It basically prevents the resin being sucked in the vacuum channel, before the whole part is filled, evening out the resin front as much as possible before the resin gets in the channel. And even if it does, it won’t go as fast as without a brakezone.
With MTI hose you don’t really need a brakezone, as resin flow will stop at the hose, and won’t be sucked in, evening out the resin flow untill it’s all along the MTI hose.
here are two pics. Bare in mind that this is a 2 sided infusion (caul plate on top, NO FLOW MEDIA, and a REALLY REALLY long break zone. A bit overkill.
http://imgur.com/2Vmud5z
http://imgur.com/zrdqjXe
Flow media can be wrapped around the inlet sprial, and then cut to 1" from EOP (end of part) all the way around the other sides. 2-4" of peel ply is used to slow down the resin. This allows the resin and voids trapped in the composite to slowly suck out, and not get into the vent line.
It can also aid in stopping racetracking, depending on your part layout.
Now i get a bit of confuse… where do you put those peel ply strips? on your pics everything is white so i cant get a proper point of view.
What I understand is that you trim your mesh smaller few inches than infused field.
You have to use peel ply otherwise the flow media will bond to the carbon. The break is just where you trim back the flow media to slow the resin down so you can ensure that the rest of the part has enough time to wet out. This area would have only the laminate and peel ply, no flow media.
Everything is white? What? Me thinks you need a new monitor.
A brake zone is particularly helpful when infusing a mold for the first time and establishing resin waste in flow lines,manifold and media etc. until you can make it exact and consistent.
It is simply a filed or strip of Peel-ply material that separates a distance from the end/edge of your laminate stack and flow media.
Nothing special really. It just works.
It can work so well and consistent that you could actually re-use your Vacuum signal hose over and over until it eventually get contaminated or cut too short.
The MTI hose can effectively do this without the need of real estate or field. Helpful with smaller flanged molds certainly.