{TAIL ~ Use} of the disk substantially eliminates the possibility of {HEAD ~ shred migration} into the second open end region during sealing thereof, thus assuring a positive seal at the envelopes tip portion 
{ TAIL ~ Use } of the disk substantially eliminates the possibility of { HEAD ~ shred migration } into the second open end region during sealing thereof , thus assuring a positive seal at the envelopes tip portion
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH