Then, a pouring aperture, of lesser diameter than {HEAD ~ the opening} in {TAIL ~ the paperboard}, is cut through the parallel barrier layers which are on the external and the internal surface of the blank 
in
Then , a pouring aperture , of lesser diameter than { HEAD ~ the opening } in { TAIL ~ the paperboard } , is cut through the parallel barrier layers which are on the external and the internal surface of the blank
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH