For thin films you may be better off looking at heat sealing anyway. Perhaps you could contact some manufacturers who offer both heat sealing and ultrasonic systems so they could give you an unbiased opinion.
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M.P. Interconsulting
Miodrag Prokic is an independent consultant, developer of new ultrasonics applications (such as ultrasonic cleaning in liquid CO2) and supplier of special ultrasonic systems for cleaning, sonochemistry and other applications. This is the new site I've just built for him, which includes a variety of technical articles and photos of modern ultrasonic cleaning systems.
Located in Neuchatel, Switzerland, with partner organisations in Russia and India, Progress Ultrasonics Group develops technology-intensive ultrasonic equipment for oil and gas condensate production, processing and transport.
In trials, oil beds in Russia and Romania demonstrated successful results with an overall average efficiency of 200% oil flow compared to normal (double the flow rate).
Re: Material compatabilities
Hi Jim,
Unfortunately I don't think either PE or polyester (PET / PBT) are compatible for ultrasonic welding with any materials other than themselves. This [url=http://www.branson-plasticsjoin.com/pdf/PW-01CharComp.pdf]compatibilty table[/url] from Branson seems to confirm.
For thin films you may be better off looking at heat sealing anyway. Perhaps you could contact some manufacturers who offer both heat sealing and ultrasonic systems so they could give you an unbiased opinion.
HTH
Chris