Abstract: An apparatus is disclosed for assisting in the release of a web from contact with the heated surface. The apparatus includes a material which is urged into contact with the heated surface upstream relative to the contact of the web to the heated surface. The material is devoid of metallic content and the arrangement is such that when the web contacts the heated surface downstream relative to the material, thermal energy is transferred from the surface to the web. The web is released from the heated surface subsequent to the transfer of the heat, such release being facilitated by the material being urged against the surface.

Abstract: A papermaking machine has a heated Extended Nip press following the pressing section. High temperature pressing raises the exit solids out of the press to 55 to 65 percent. The web then enters a high intensity dryer section where the web is pressed onto a dryer roll in intimate contact with the roll where it is dried up to approximately 90 percent solids. A coating on the dryer roll and the Extended Nip backing roll is composed of ceramic, metal and a fluorocarbon to allow the web to be separated from the backing roll and the dryer roll with ease. The dryer roll is internally heated by steam or preferably gas to between 200.degree. F. and 500.degree. F. An aircap positioned over the web on the dryer blows hot air at a temperature of 200-500.degree. F. at a velocity of 15,000 to 30,000 feet per minute onto the web.

Abstract: The press section of a papermaking machine has two conventional presses followed by two or three presses including one heated Extended Nip press thereby allowing control of the two-sidedness of the web by balancing the temperature and pressure of the Extended Nip Press with the pressure and temperature of the additional presses to form a one-sided sheet. The use of smooth high temperature press felts can aid in the reduction of two-sidedness of the formed web. The dryer section may alternatively add a fifth press utilizing the first dryer roll as the backing roll, two Extended Nip presses, a heated Extended Nip press followed by a heated conventional press, or a heated Extended Nip press in the third pressing position followed by a conventional heated press utilizing the first dryer as the backing roll.

Abstract: A high temperature pressing roll has a cast or formed steel roll which is coated with a molybdenum-containing alloy. The preferred alloy has 14 to 16 percent molybdenum, 28 to 30 percent nickel, 30 to 34 percent chromium, 1.2 to 1.8 percent silicon, 4 to 4.5 percent boron, a maximum of 0.2 percent carbon and copper between 3 and 3.8 percent with the balance being iron. The roll is first coated with a bonding coating consisting of nickel and chromium. This bonding layer is then flame sprayed or plasma sprayed with a molybdenum alloy. The coating once applied is ground to a 30 RA or smoother surface. The molybdenum alloy is sprayed on to achieve a surface depth of approximately forty thousandths of an inch.

Abstract: An extended nip press has a heated backing roll, on the surface of which a paper web is preheated before it passes through the extended nip. The paper web is restrained on the surface of the backing roll to achieve post-pressing drying. During a portion of the post-pressing drying, the extended nip press may be arranged so that the paper web is not backed by the pressing/drying felt, thus allowing free venting from the web to occur. In some cases, this zone will be augmented by a vacuum assist unit to draw steam away. This high temperature press is capable of outgoing dryness in the range of sixty-five percent versus fifty percent for conventional technology. This combination of high temperature pressing and drying can be expected to improve the maximum strength of the web by approximately 20 percent or more over conventional pressing methods. Two high temperature press dryers of this invention may be combined to achieve outgoing dryness of approximately seventy percent.

Abstract: 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.

Abstract: 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.

Abstract: A spreader bar apparatus is disclosed for separating slit portions of a web. The apparatus includes a first spreader bar which extends in a cross-machine direction relative to the web. The first spreader bar is bowed relative to the slit portions such that the slit portions are separated axially relative to each other when the slit portions are guided around the first spreader bar. A second spreader bar is disposed downstream relative to the first bar and extends in a cross-machine direction relative to the web for guiding the separated slit portions. The second bar is bowed relative to the separated slit portions such that each of the slit portions disposed downstream relative to the second bar is disposed parallel to each other.

Abstract: A self-loading type of controlled deflection roll has two sets of opposed, hydraulically actuated pressure shoes extending along its length. Each set of opposed pressure shoes is arrayed in a plane and the two planes intersect perpendicularly with their line of intersection coincident with the longitudinal axis of the roll. The distance from the surface of the beam on one pair of opposite sides to its longitudinal axis for one set of pressure elements is less than the corresponding distance on the other pair of opposite sides for the other set of pressure elements. The self-loading roll is intended to be brought into nipping engagement with another roll. The center support beam rotates in conjunction with a corresponding retraction of the pressure shoes in the oncoming direction toward the intended nip-line of engagement with another roll. This permits the rotatable shell of the self-loading roll to be supported at a lower position relative to the longitudinal axis of the roll.

Abstract: An active attenuation system is provided for attenuating the pressure pulses in a liquid flowing in a pipe. The system includes an actuator for introducing nulling pressure pulses into the pipeline having the same frequency, but phase reversed to provide opposite amplitude of the pressure pulses to be attenuated. A plurality of pressure sensors are disposed in the pipe to sense the pressure pulses to be attenuated and these sensors are connected to a pressure transducer amplifier system which, in turn, is electrically connected to a control monitor which adaptively models the responses and continuously adjusts its output to a power amplifier which, in turn, signals the actuator to produce nulling pulses at the desired frequency and amplitude to attenuate the pressure pulses at a desired location, i.e. headbox or pipeline termination, in the liquid flowing through the pipe.

Abstract: A method and mechanism for assembling paper machine filled rolls including a lower support with a cylinder and a piston for receiving a roll mandrel, vertically extending bolts for supporting a plate to press on relatively soft disks slid over the mandrel end, a variable speed vibration generator connected to the upper end of the mandrel with a vibration speed control so that the mandrel can be vibrated through natural frequencies and harmonics thereof with a device to monitor mandrel vibration frequency and displacement so that the disks on the mandrel compact more effectively and the friction between the disks and mandrel is reduced.

Abstract: The present invention relates to a headbox assembly wherein a headbox is subjected to extraneous vibrational energy from adjoining machinery or the like and provides at least one vibration absorber rigidly secured to the headbox in the plane of vibration of the extraneous vibration, the vibration absorber creating a node at the headbox to absorb vibrational energy transmitted thereto.

Abstract: Noise-causing vibrations in the span of a tensioned web running over and away from an arcuate guide surface area of a circular perimeter fixed guide bar at a speed such that in the off-running angle between the web and the curved perimeter of the bar, air moving in the direction of the web in such angle would tend to follow the curvature of the bar (Coanda effect) and cause splitting of the air between the web and the bar, inhibited by locating spoiler means in a plane extending substantially tangentially from the off-running side of the arcuate guide surface area. The spoiler means is desirably in the form of one or more ribs providing surface in the tangential plane. Where the web span runs between spaced fixed circular perimeter bars, spoiler means may also be located in a plane extending substantially tangentially toward the on-running side of the arcuate guide surface of the bar located at the downstream end of the span.

Abstract: Trim strip from a web slitter is received in a chute passageway which guides the trim strip away from the slitter. Low velocity air is supplied in the passageway to provide air lubrication between the chute structure and both opposite faces of the trim strip which thereby floats away from the slitter smoothly and efficiently.

Abstract: A method and mechanism for winding a roll from a continuous traveling web including first and second parallel winder drums supporting the wound roll and one or more rider rolls on top of the roll being wound with the rider roll circumferential location being changed during the winding of the roll to compensate for the changing spring constant of the roll being wound, and in one form applying a force with a second rider roll and in another form with a third rider roll with the rolls being changed in position relative to the roll being wound independent of each other.

Abstract: In a mechanism for winding a continous traveling sheet of paper, a device including first and second parallel winder drums driven in rotation in the same direction to support a roll being wound on a core supported between the drums with a rider roll on top of the roll and mechanism for laterally moving the drums apart as a function of increase in size of the roll being wound and measured by a rider roll on the roll.

Abstract: A winder or other rotary mechanism having a rotating member subjected to vibrations such as a rider roll for the winder including an energy absorbing vibration damper connected to the rider roll so that defects in a roll being wound due to vibrational engagement of the rider roll with the wound roll are avoided with the dampener including a stationary hollow tube secured along its length to a beam coextensive with the rider roll with a beam member within the stationary tubular member and a resilient hose coiled about the beam and inflated and a plurality of axially extending metal slats between the inflatable tube and the inside of the tubular member laminated with a viscoelastic material for absorbing vibration of the rider roll.