Beloit Corporation

Aikawa Fiber Technologies Inc.

Ronald J DeFoe

Edward C Kirchner

Robert William Gooding

Jens O Heymer

Disclosed is a refiner filling piece for a refiner having a rotor that rotates about an axis of rotation and cooperates with a stator to mechanically treat a pulp containing cellulosic fibers. The refiner filling piece is mountable to the rotor or the stator. The refiner filling piece comprises a base and a plurality of spaced-apart refiner bars, each refiner bar being defined by a bar length and a bar height. At least some of the refiner bars have a surface coated with a variable coating. The surface having the variable coating may be the leading surface of the bar.

Refiner filling piece having variably coated bars

An apparatus for refining fibrous materials such as stock suspensions for papermaking which includes a housing, an inlet and outlet in said housing for receiving and discharging the treated materials, a shaft rotatable in said housing, a plurality of rotating refiner disks spaced along the shaft and an additional plurality of refiner disks interspersed with the rotor disks and providing therewith refining gaps through which the stock suspension passes. The other refiner disks can be either stationary or counter-rotating with respect to the rotor disks. The two sets of refiner disks are supported by means of axially flexible membranes. The present invention provides refiner disks which have undercut portions in the surfaces adjacent to the flexible annular membranes to increase the axial flexibility of the membranes.

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Becket, MA, United States of America

Ronald J DeFoe