The weakened portion 45 is provided by reducing width of the seal by reducing the amount of adhesive 21 between {TAIL ~ the top and bottom foil sheets} 39 and 40 in {HEAD ~ a specified area} 
The weakened portion 45 is provided by reducing width of the seal by reducing the amount of adhesive 21 between { TAIL ~ the top and bottom foil sheets } 39 and 40 in { HEAD ~ a specified area }
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 TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD