Abstract: The problem of inconsistent steam penetration of a fibrous sheet is solved by a steam box having a steam header, a diffuser housing disposed within the steam header, wherein walls disposed in the diffuser housing divide an inside of the diffuser housing into multiple diffuser chambers, wherein a valve is configured to fluidly and programmatically communicate with each of the multiple diffuser chambers, such that a steam from the header box may selectively enter one of the diffuser chambers depending upon the valve's orientation in an open or closed position; and multiple orifices of different sizes per diffuser chamber. Ideally, exemplary steam boxes may also comprise a diffuser plates per diffuser chamber. Preferably, the diffuser plates may be located at a bottom of the diffuser chamber. Exemplary steam box systems may further comprise control equipment to manage the flow of steam from the steam header into the diffuser chambers.

Abstract: The problem of inconsistent steam penetration of a fibrous sheet is solved by a steam box having a steam header, a diffuser housing disposed within the steam header, wherein walls disposed in the diffuser housing divide an inside of the diffuser housing into multiple diffuser chambers, wherein a valve is configured to fluidly and programmatically communicate with each of the multiple diffuser chambers, such that a steam from the header box may selectively enter one of the diffuser chambers depending upon the valve's orientation in an open or closed position; and multiple orifices of different sizes per diffuser chamber. Ideally, exemplary steam boxes may also comprise a diffuser plates per diffuser chamber. Preferably, the diffuser plates may be located at a bottom of the diffuser chamber. Exemplary steam box systems may further comprise control equipment to manage the flow of steam from the steam header into the diffuser chambers.