An edge coating of polymer or other material is disposed on and seals the interior edge of the base sheet and may project beyond the facial planes of {TAIL ~ the base sheet} to define protruding rims extending around {HEAD ~ the aperture} 
An edge coating of polymer or other material is disposed on and seals the interior edge of the base sheet and may project beyond the facial planes of { TAIL ~ the base sheet } to define protruding rims extending around { HEAD ~ the aperture }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD