Beloit Corporation

Jeffrey H Pulkowski

Jere W Crouse

L H Busker

Elizabeth A Macklem

Roy J Porter

Robert J Orange

Steven J Siler

A press apparatus and method for pressing water from a paper web is disclosed. The apparatus includes a frame and a first press roll which is rotatably supported by the frame. A second press roll cooperates with the first roll for defining therebetween a pressing nip such that in use of the apparatus, the web extends through the nip for pressing the water therefrom. An elastomeric cover covers at least one of the rolls such that the pressing nip is extended in a machine direction so that the residence time of the web during passage of the web through the nip is increased.

Heated press apparatus with elastomeric covered roll(s)

An apparatus and method is disclosed for removing fluid from a fibrous web. The apparatus includes a press member and a blanket which cooperates with the press member for defining therebetween an elongate pressing section such that the web is pressed between the press member and the blanket during passage through the pressing section. An elongate shoe urges the blanket towards the press member such that when the web passes through the pressing section, fluid is removed from the web. A heater is disposed adjacent to the press member for transferring heat to the web such that when the web passes through the press section, the web is subjected for an extended period to increased pressure and temperature so that water vapor generated within the pressing section during passage through the pressing section forces the fluid in the liquid phase away from the web. The press member defines a pressing surface which is porous so that delamination of the web is inhibited.

Heated extended nip press with porous roll layers

A heated extended nip press apparatus and method are disclosed for pressing water from a formed web. The apparatus includes a frame and a backing roll rotatably supported by the press frame. A press device is connected to the press frame and movable relative to the backing roll. The press device cooperates with the backing roll for defining therebetween n extended nip for the passage therethrough of the web. An endless looped blanket extends through the extended nip such that the web is disposed between the blanket and the backing roll. Additionally, the press device includes an arrangement for selectively changing the pressure applied on the blanket along a machine direction relative to a further pressure applied for moving the press device relative to the backing roll such that optimum web properties are obtained and delamination of the pressed web is inhibited.

Method for heated extended nip pressing

A heated extended nip press apparatus is disclosed for pressing water from a formed web. The apparatus includes a frame and a backing roll rotatably supported by the press frame. A press device is connected to the press frame and movable relative to the backing roll. The press device cooperates with the backing roll for defining therebetween an extended nip for the passage therethrough of the web. An endless looped blanket extends through the extended nip such that the web is disposed between the blanket and the backing roll. Additionally, the press device includes an arrangement for selectively changing the pressure applied on the blanket along a machine direction relative to a further pressure applied for moving the press device relative to the backing roll such that optimum web properties are obtained and delamination of the pressed web is inhibited. Cross-machine direction recesses in the press shoe enable the shoe to be selectively positioned in the machine direction.

Heated extended nip press apparatus

Inductors for heating rolls especially of the type used in rolling mills for sheet materials such as paper, textiles, plastics and the like, are configured to enhance and concentrate eddy currents in areas along the length of the roll to selectively heat the roll as desired and control moisture and caliper properties of the sheet. The inductors have cores with a center leg around which the exciting coil is wound and an outer leg surrounding the coil and connected at one end to the inner leg. These inductors or electromagnets are mounted immediately adjacent a roll of magnetic flux conducting material, such as iron or steel, to heat the roll surface as desired across the length of the roll as it is rotated through the concentrated electromagnetic field generated by the inductor. The magnetic field or flux is concentrated in an annular zone and passes between the nested inner and outer legs of the core through the roll without travelling through a wide air gap and the desired roll temperatures are achieved with minimum current input to the coil. The air gap may be varied in the cross machine direction and the excitation of the inductors may be varied to induce or compensate for temperature variations across the roll.

Growing community of inventors

Beloit, WI, United States of America

Jeffrey H Pulkowski