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