A double facer 2, wherein air sealing plates which are slidably held in contact with said belt and which are vertically movable, are provided at the lower edges of {TAIL ~ the side walls} of said {HEAD ~ air chamber} 
A double facer 2 , wherein air sealing plates which are slidably held in contact with said belt and which are vertically movable , are provided at the lower edges of { TAIL ~ the side walls } of said { HEAD ~ air chamber }
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 OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD