It is therefore {HEAD ~ one object} of the present invention to provide {TAIL ~ an improved double facer}, in which pressurized air would not leak out through a gap between a side wall of an air chamber and a belt on the upper side, hence production of unacceptable products can be prevented, and moreover, a driving power expense for a pressurized air feed source can be economized 
It is therefore { HEAD ~ one object } of the present invention to provide { TAIL ~ an improved double facer } , in which pressurized air would not leak out through a gap between a side wall of an air chamber and a belt on the upper side , hence production of unacceptable products can be prevented , and moreover , a driving power expense for a pressurized air feed source can be economized
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