Weyerhaeuser Company Limited

Ray Crane

Nordahl K Johnson

A hammermill for singulating cellulosic fibers from a wet pulp sheet includes a cylindrical housing, a feed slot with a breaker bar positioned therein and a rotor mounted for rotation in the housing. Feed rolls are provided to feed a sheet of pulp into the feed slot upstream of the breaker bar. A plurality of hammers are mounted on the rotor. Air is introduced into the hammermill housing tangentially downstream from the second feed slot. An air outlet is positioned tangentially on the housing downstream from the air inlet to allow air and singulated fibers to escape. A process for producing singulated fibers includes wetting a fiber sheet, milling the fibers in the hammermill, and drying the fibers. The singulated fibers have a low knot content.

Process for singulating cellulose fibers from a wet pulp sheet

Methods and systems for applying crosslinking agent to a sheet of cellulose fibers are described. The method and system apply crosslinking agent to one or both sides of the sheet and results in a sheet having a high loading of crosslinking agent that is uniformly distributed within the sheet.

Crosslinking agent application method and system

A hammermill for singulating cellulosic fibers from a pulp sheet comprises a cylindrical housing, a feed slot with a breaker bar positioned therein and a rotor mounted for rotation in the housing. Feed rolls are provided to feed a sheet of pulp into the feed slot upstream of the breaker bar. A plurality of hammers are mounted on the rotor. Air is introduced into the hammermill housing tangentially downstream from the second feed slot. An air outlet is positioned tangentially on the housing downstream from the air inlet to allow air and singulated fibers to escape.

Hammermill

A unique hammermill for fiberizing sheet comprised of natural or synthetic fibers, that has a reduced tendency to clog entrance slots of the fibrous sheets into the interior of the hammermill. According to the invention, the hammermill has a nose bar deflector, mounted upstream of a feed slot and preferably extending along the entire length of the slot, to deflect fibers from the slot entrance, thereby preventing clogging of the slot. In one embodiment, the deflector is substantially triangular in cross section, wherein one side is affixed laterally along an upstream edge of a fibrous sheet feed slot, so that one side of the deflector slopes away from an internal surface of the hammermill shell to deflect fibers, carried along the surface of the shell, away from the feed slot, thereby preventing clogging. In other embodiments, the shape of the deflecting surface differs, but is designed to deflect fiber and particulates from the openings of downstream slots.

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Columbus, MS, United States of America

Ray Crane