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