Advanced Materials Corporation

Voith Patent Gmbh

Yang T Shieh

Erik Garth Vaaler

Jose J A Rodal

Matthias Schmitt

Martin Breineder

Hubert Bischof

A roll for a machine for processing a material web, in particular a paper, cardboard, or tissue machine, has a cylindrical roll core and a roll cover which is arranged on the radially outer lateral face of the roll core. The roll cover has a functional layer and a connecting structure which lies radially between the roll core and the functional layer. The radially outer lateral face of the functional layer provides a contact surface which can be brought into contact with the material web or a covering. A plurality of pressure and/or temperature-sensitive sensors are embedded in the roll cover. The sensors are arranged in the connecting structure or at the interface between the connecting structure and the functional layer.

Roll with sensors for a machine for producing and/or processing a material web and machine for producing and/or processing a material web

A roll for use in a papermaking machine has a circumferential surface formed of a polymeric material including a plurality of chemically reactive elastomer nano-particles and a resin. The polymeric material has a glassy transition temperature that is substantially the same as a glassy transition temperature of the resin alone.

Roll for a papermaking machine

A covered roll is disclosed. Under an exemplary embodiment, the covered roll includes a roll core base, an under-layer formed of densely packed fibers and a covering layer. The under-layer, which may include straight and directionally oriented fibers, is infused with a thermoset resin and circumferentially surrounds the roll core base. The covering layer, which may be formed of a rubber, urethane, thermoset resin or other plastics, circumferentially surrounds the under-layer. The resin infused under-layer provides improved strength to the resulting covered roll and improves adhesion between the covering layer and the metal roll core.

Covered roll having an under-layer formed of resin infused densely packed fibers that provides increased strength and adhesion properties

The invention includes a method for producing a covered roll having a reinforcement fiber mat under layer infused with low viscosity thermoset resin and a smooth high temperature, high performance polymeric outer layer. The mat is formed of a plurality of layers, each layer having a leading edge that abuts a following edge when wrapped over the roll core, each subsequent layer being affixed to the previous layer along a seam, the seams being spaced apart angularly from one another to prevent irregularities over the surface of the resulting roll core. One or more layers of the dry reinforcement fiber mat may be formed of a two-ply construction, the first ply having fibers arranged in a random pattern, the second ply having aligned fibers oriented either parallel or perpendicular to the roll core central axis. The invention also includes an improved mold tape assembly for use in applying a polymeric cover over a roll core and an inventive apparatus for fabricating the mold tape assembly. The mold tape assembly is formed of at least two ribbons that are arranged in a substantially parallel and partially overlapping orientation, the ribbons being spot welded together at a predetermined radius of curvature. The apparatus for fabricating the mold tape assembly further includes an inventive device for aligning the ribbons prior to welding and an inventive curvature shoe for disposing the ribbons at a predetermined radius of curvature during welding.

Method for and devices used in covering a roll core with a resin infused fiber reinforced adhesive under layer and a polymeric top layer, the method including the use of an improved mold tape

A method and apparatus for covering a roll core with a polymeric material, preferably a high performance thermoplastic material, is disclosed. The method includes first providing a cylindrical roll core having two ends, a length, and an outer surface. A spacer assembly is attached proximate one end of the roll core, the spacer assembly having a circumference greater than that of the roll core. After preheating to a desired temperature, the roll core is then placed within an apparatus in a substantially vertical orientation and held therein by suitable fixtures, e.g., opposed universal chucks. A length of mold tape is helically wound over the length of the roll core in a spaced-apart relationship therewith to define an application zone between the mold tape and the roll core outer surface. A filament formed of the polymeric material is extruded within the application zone and helically wound over the roll core outer surface so that the roll core is covered with the material. Localized heating is applied to the roll core surface just prior to the application of the filament to improve bonding to the roll core surface. The mold tape acts as a supportive form to prevent sagging of the extruded material prior to solidifying. The wound extruded material is allowed to solidify in a temperature controlled manner to be hardened to form a continuous layer over the length of the roll core. Finally, the mold tape is removed. The resulting covered roll fabricated in accordance with this method has minimal residual stresses and a has a higher tensile strength, compression strength and impact strength. The resulting covered roll also has a glass transition temperature, greater durability, more suitable Young's modulus, and a longer lifespan than prior art covered rolls. The covered roll fabricated in accordance with this method also performs consistently under extremely high pressures, high heating conditions and high speed conditions.

Growing community of inventors

Wallingford, PA, United States of America

Yang T Shieh