Hello
I am new to composites - I started a small project in my garage.
I build a two cavities mold.
My finished part is triangular, so the bladder as the same shape and is closed at the inflation connection. I used presta connection of an inner tube for this.
It is really time consuming to build the bladder,
From cutting the wax sheet at the correct shape, then prepare silicon with thixotropic additive and hardener, then brush the two half of the mold (silicon thickness is difficult control with a brush), then wait 24h curing , then find leak and fix…
I ended up with a small tailor made bladder with about 2-3hours of work (+24h)
I lay up each mold with preg and inflate the bladder - 10h later at 80 degrees the part correctly pop out of the mold - cool
However trying to pull out the bladder, it tear apart and I can’t extract it of the finished part anymore. I am trying to find a way to dissolve the remaining silicon stayed inside the part…
It was a trial mold I build to make sure I use the correct technique/material
My project will continue with a bigger mold now
My question is about the preferred way to build a bladder.
I saw some of you use ULINE Polytube.
However I am wondering if this can expand to multiple section across the shape of a part.
In some areas I have small rectangulaire section, in some other like tube connection the section is completely different.
For this reason I liked the RTV silicon bladder I made, which fit with the exact shape.
What would be the simplest/efficient solution ? Thanks