In principle the maximum width of the margin on an inner for a pack according to the invention is dictated by economic factors, but generally {HEAD ~ only a narrow folded margin} is needed to give {TAIL ~ a substantial increase} in stiffness at the edges of the sheet 
is needed to give
In principle the maximum width of the margin on an inner for a pack according to the invention is dictated by economic factors , but generally { HEAD ~ only a narrow folded margin } is needed to give { TAIL ~ a substantial increase } in stiffness at the edges of the sheet
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH