Aluminum foil hermetic sealing
Aluminum foil hermetic sealing
(OP)
Our application requires a hermetically sealed, heat conducting pouch for a chemical heating reaction to conduct heat to a surrounding water environment. The byproducts of the heating reaction are hazardous and must be kept separate from the water environment. We have been attempting to make hermetically sealed aluminum foil pouches, and sealing aluminum to various polymers to no avail. The aluminum foil pouches leak regardless of the bonding method. We have attempted tapes, adhesives, epoxies, failed heat seals, etc.
Can aluminum foil be welded to itself, either heat welded or ultrasonically welded?
Also, are there any solutions available to seal aluminum foil to polymer films such as polyethylene, PET, or polypropylene?
Can aluminum foil be welded to itself, either heat welded or ultrasonically welded?
Also, are there any solutions available to seal aluminum foil to polymer films such as polyethylene, PET, or polypropylene?





RE: Aluminum foil hermetic sealing
RE: Aluminum foil hermetic sealing
But, ultrasonic welding of aluminum as a seal weld is a non-starter in my book. The weld will be unreliable unless you can ensure that the surface oxides on the foil are removed and/or well mixed/broken up into the weld so as not to create a leak path. That's a pretty tall order in thin material. Whatever process used should include an inert cover gas (e.g. helium, argon) to control said oxides from forming (in addition to what's already on the part surface).
RE: Aluminum foil hermetic sealing
TVP is correct. I have seen aluminium foil welded to itself in a regular air atmosphere at EWI:
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RE: Aluminum foil hermetic sealing
RE: Aluminum foil hermetic sealing
If parts of the polyethylene or polystyrene layers of Mylar could be removed leaving only foil, that could be useful. Or rather, a foil piece with PE or PS-coated edges would be very useful.
RE: Aluminum foil hermetic sealing
RE: Aluminum foil hermetic sealing
RE: Aluminum foil hermetic sealing
RE: Aluminum foil hermetic sealing
RE: Aluminum foil hermetic sealing