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 only a narrow folded margin is needed to give a substantial increase in stiffness at {HEAD ~ the edges} of {TAIL ~ the sheet} 
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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 only a narrow folded margin is needed to give a substantial increase in stiffness at { HEAD ~ the edges } of { TAIL ~ the sheet }
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