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