VACUUM ASSISTED WEB DRIVE FOR CORRUGATOR DOUBLE BACKER

摘要

A double backer (10) for curing the web bonding adhesive and drying the corrugated paperboard web (11) utilizes a web holddown apparatus for maintaining the web in intimate drying contact with the lower heating units which does not require the use of a driven holddown belt. The web is pulled through the double backer (10) by a downstream vacuum conveyor section (23) comprising a single full width belt (92) to the upper surfaces of which a vacuum is applied. The vacuum drive belt (92) has low friction strips (2, 7) on the underside by which the belt is supported on vacuum plenum support surfaces (97) and a unique pattern of vacuum distribution channels (105) on the other side of the belt which together reduce friction and drive power requirements.