It is therefore one object of the present invention to provide an improved double facer, in which pressurized air would not leak out through a gap between a side wall of an air chamber and {HEAD ~ a belt} on {TAIL ~ 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 
on
It is therefore one object of the present invention to provide an improved double facer , in which pressurized air would not leak out through a gap between a side wall of an air chamber and { HEAD ~ a belt } on { TAIL ~ 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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