Inflatable bladder vs foam core


Inflatable bladder vs foam core
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Tony2125
Tony2125
Tony2125
posted 8 Years Ago HOT
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I am looking to build an inflatable bladder with welded polyéthylène bag.
I did many trials and had difficulties to get the bladder sealed perfectly, at some points of the welding line.
Basically I tried to duplicate this technique
https://www.youtube.com/watch?v=STj0eqDpafo

Having build a split mold, I was wondering if I could build a core with expandable PU foam on both side of the mold, then glue the two foams together to get a core that has the perfect inner shape of my mold.
I think some bike makers use this kind of core but in PS to build bike frame.
https://www.edge-design.com.tw/EPS.html

Would the PU foam be something compatible with prepreg and curing temperature ??
Also I am not sure PU or PS expand with temperature increase
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Inflatable bladder vs foam core
Tony2125 - 8 Years Ago

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