Applying blowing pressure through the embossing dies and applying {HEAD ~ a vacuum} through {TAIL ~ the undercut shaping portion} 
through
Applying blowing pressure through the embossing dies and applying { HEAD ~ a vacuum } through { TAIL ~ the undercut shaping portion }
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL