I want to see a study done on such a devices safety. The sound waves it emit are able to desiccate clothing. What is the effect of these sound waves escaping the device? Would it desiccate living tissue?
It also mentions that they're thinking of creating a tumble/drum dryer with these piezoelectrics. As opposed to a traditional tumble dryer that spins to aerate the cloths, I think the spinning motion would instead be required to pin the clothing against the piezoelectric lined drum (though I imagine it would need to stop and change direction periodically in order to expose different areas of the fabric to the drum wall).