Method and apparatus for injecting steam at a single facer bonding nip

摘要

An apparatus and related method for forming a single face paperboard web are disclosed. The apparatus of the present invention includes a forming corrugating roll for corrugating flutes on a medium web and a carrier corrugating roll operably connected to the forming corrugating roll for carrying the medium web into contact with a liner web. A bonding nip is defined by the carrier corrugating roll for pressing the liner web into adhering contact with the medium web, thereby forming a single faced web. A steam supplying device, including at least one fluid port in fluid communication with the bonding nip, supplies a low pressure steam against at least one of the liner web and the medium web. The steam supplying device further includes a body having a heated surface facing one of the liner and the medium webs. A primary channel extends within the body and is in thermal communication with the heated surface. A high pressure steam is supplied to the primary channel for heating the heated surface. A plurality of secondary channels extend within the body and are in fluid communication with the plurality of fluid ports. A low pressure steam is supplied to the secondary channels for release by the plurality of fluid ports within the bonding nip to assist in the rapid gelatinization of glue between the liner and medium webs.