APPARATUS AND PROCESS FOR THROUGHAIR DRYING OF A PAPER WEB.

摘要

A paper web drying apparatus (10) and process is provided in which the heated air drying medium is replaced with between 10 percent to 100 percent of live steam (82). The addition of a steam component to the drying medium provides for a higher drying temperature to be supplied to the wet moving web (38). The introduction of live pressurized steam (82) contributes to the load of force of the drying medium, thereby decreasing the energy requirements of blower motors. The introduction of pressurized live steam (82) also lowers the free atmospheric oxygen content of the drying medium which reduces the burning or scorch hazard associated with high temperature drying of a cellulose web.