Conventional spinning apparatus commonly used to form {HEAD ~ fibers} of {TAIL ~ polyethylene terephthalate} conveniently may be selected 
of
Conventional spinning apparatus commonly used to form { HEAD ~ fibers } of { TAIL ~ polyethylene terephthalate } conveniently may be selected
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH