Abstract: A vacuum roll transfer apparatus is disclosed for drying a web extending through a single tier dryer section of a paper machine. The apparatus includes a rotatable perforate shell having a first and a second end. A stationary duct is disposed within and along the length of the shell between the ends of the shell. The duct is connected to a source of partial vacuum and the shell defines a plurality of holes along the length thereof such that in use of the apparatus, when the duct is connected to the source of partial vacuum, a partial vacuum is generated within a chamber defined between the shell and the duct. A flow restricting arrangement is disposed within the duct for generating a greater vacuum level adjacent to at least one of the ends of the shell for facilitating threading of a tail of the web.

Abstract: A paper pulp screening apparatus wherein a modular cylindrically-shaped screen plate is formed of a thin material of uniform thickness bent to form an undulating shape to increase the screening area, and the screen plate is supported by cylindrical-backing members to give the plate strength, with the plate being formed into various complex shapes. Manufacturing methods for forming the undulating shapes are disclosed.

Abstract: Separate density profiles are obtained for each station of a multi-station winder. The technique requires a single processor for simultaneously monitoring the density of any number of rolls being wound. The density may also be monitored for the unwind roll for determination of roll structuring changes by a winder. A simple system is provided in which each of the rolls is provided with an encoder. The encoder of a center roll of fixed diameter produces a fixed number of pulses per revolution representing paper length and the pulses produced by the encoders of each of the winding stations are counted along with the pulses produced by the winder of the center fixed diameter roll for computing density from roll and angular parameters and basis weight.

Abstract: A vacuum guide roll apparatus is disclosed for guiding a web between an upstream dryer and a downstream dryer of a dryer section. The apparatus includes a perforate roll shell having a first and a second end. The shell defines an elongate chamber which extends between the first and the second ends. A first and second shaft are rigidly secured to and disposed coaxially relative to the shell. The shafts are disposed adjacent to the first and second ends respectively of the shell. The shafts define respectively a first and second journal. A first and second bearing cooperate with the first and second journals respectively for rotatably supporting the roll shell. A housing is disposed coaxially relative to the shell and adjacent to one of the shafts. The housing defines a passageway which is connected to a source of partial vacuum. A first annular seal is disposed between the housing and the one shaft for sealing the housing relative to the one shaft.

Abstract: A drive mechanism for a paper machine controlled deflection roll or the like having a tubular roll shell driven by a ring gear with driving pinions driving the ring gear and each of the pinions mounted on support shafts with the support shafts carrying planetary gears driven by a sun gear. The sun gear is carried on a power input shaft mounted in vertical slides. The planetary gears are horizontal of the sun gear so that the sun gear can shift and be self-positionable to equalize the load on the gear teeth as the sun gear drives the planetary gears with a thrust bearing on the shaft and helical teeth between the sun gear and the planetary gears.

Abstract: A felt turning roll for use in the dryer section of a papermaking machine has a stationary shaft extending outwardly from at least one end of a perforated roll shell. The stationary shaft extends inwardly from the end of the roll for only a short distance which is substantially less than half the length of the face width of the roll. The stationary shaft is bored to permit a source of sub-atmospheric air pressure to be applied to its exterior portion. The inner portion of the shaft has a valve, a seal near its inner end between it and the roll shell, and openings to permit the exposure of sub-atmospheric air pressure within the roll shell on either side of the seal. The use of short stationary shafts eliminates the center shaft which otherwise would extend for the length of the roll.

Abstract: A method for washing pulp in a batch digester modified pulping process wherein black cooking liquor used for cooking the chips is partially displaced by pumping a first stage wash effluent into the bottom of the digester, additional amounts of the cooking liquor are displaced by pumping a second stage wash effluent, and so on, until sufficient increments of wash effluent have been pumped to displace the cooking liquor. A wash filtrate water is then pumped into the digester from a final pulp washing operation to displace the hot black liquor until all of the hot black liquor is sent to an accumulator, and the various wash effluents have been replenished in their respective stages.

Abstract: Apparatus for maintaining a relatively placid pool of liquid coating material in the trough between two nipped rolls comprises a pair of deckles, one disposed near either end of the nipped rolls, each of the deckles having an edge generally conforming to a segment of the adjacent roll to effectively form an end of the trough formed by the rolls. At least one of the deckles has one or more openings which permit the liquid coating material to flow laterally out of the trough and through the deckle at a rate proportional to the depth of the coating material in the trough. Controlling the lateral outward flow of material from the trough stabilizes both the turbulence of the liquid coating material in the trough and the surface condition of the coating material.

Abstract: A trailing element device is disclosed for use in a headbox of a papermaking machine. The device includes a plurality of laminated sheets, the sheets being disposed within the headbox for dampening turbulence within the headbox. A binder cooperates with the plurality of sheets for binding the sheets together such that the trailing element device defines an upstream bead which extends in a cross-machine direction within the headbox. The bead is anchored within a slot defined by the headbox such that the bead is permitted to pivot within the slot so that a downstream end of the trailing element device is permitted to freely float within the headbox for attenuating the turbulence within the headbox. A wear resistant cladding is applied to the upstream bead for inhibiting wear and fracturing of the sheets caused by frictional engagement between the trailing element device and the slot.

Abstract: A short dwell coater apparatus is disclosed for coating a web with a coating material, the web moving contiguously with a rotating backing roll. The apparatus includes a housing which is disposed on the opposite side of the web relative to the backing roll. The housing defines a chamber is connected to a pressurized source of coating material. The chamber is exposed to the web such that the web supported by the backing roll is coated with the coating material during passage of the web past the coating chamber. Each of a first and second weir extend in a cross-machine direction such that the coating chamber is bounded by the weirs and the web moving between the weirs. The first and second weirs define respectively first and second overflow gaps. The arrangement is such that during use of the apparatus, when the web moves past the coating chamber, coating material is coated onto the web while excess coating material overflows through the first and second gaps for recirculating through the coating chamber.

Abstract: A controlld deflection roll has a unique liquid barrier and heat shield which includes a chamber filled with cooling fluid. In a preferred embodiment, the barrier comprises two chambers and a space in fluid communication with both chambers for circulating cooling fluid between the chambers and into and out of the roll. The barrier is interposed between the interior cavity of the roll containing the extremely hot hydraulic fluid which actuates the apparatus for controlling the deflection of the roll, and the bearings which rotatably align the roll shell relative to the space. The barrier, thus, functions to thermally insulate the bearings from heat, whether by radiation or by direct contact with the hydraulic fluid.

Abstract: An extended nip press apparatus is disclosed for pressing water from a web of paper. The press includes a blanket which defines an endless loop and a first and a second lateral edge. Edge seals cooperate with the edges for sealing the edges of the blanket against egress of lubricant disposed between the shoe and the blanket. The edge seals include a head rotatably secured to a frame and an extension which extends from the head. The extension cooperates with the first edge of the blanket and defines a duck's bill configuration in a cross-machine sectional view such that the first edge of the blanket conforms to a surface defined by the extension. The surface has a first portion which undulates radially away from the head in an outward direction, and a second portion which undulates radially inwardly towards the head in an outward direction. A clamp adjustably secures the first edge of the blanket to the extension so that flow of lubricant from between the shoe and the blanket past the head is inhibited.

Abstract: A screening apparatus comprises a pair of stationary concentric screens with a plurality of foils rotating therebetween and adjacent thereto, the individual foils being radially aligned. The screening apparatus comprises a tangentially disposed slurry inlet and a diametrically and tangentially disposed heavy rejects outlet at the end of a heavy rejects trap. The light reject/accepts slurry flows into the screening zone and, after separation, is discharged at an end of the screening apparatus by way of respective light rejects and accepts outlets. The accept outlet is located axially with respect to the screen cylinders and rotating foils so the pressure pulses are virtually eliminated in the screening process. The apparatus may be constructed for vertical or horizontal rotation of the foils.

Abstract: A chip slicer for slicing wood chips such as for use in a pulp preparation procedure with an annular housing having knives therein and a rotor therein with anvil means for carrying wood chips against the knives with a shaft extending coaxially for diving the rotor, a driving hub mounted on the shaft and connected to it, a driven hub rotatably mounted by bearings on the driving hub with each of the hubs having annular plates and shear pins extending axially between the plates of a strength to transmit normal rotational power and to shear upon forced stalling of the rotor with the driven hub permitting continued rotation of the driving hub within the driven hub and continued rotation of the shaft with forced stalling of the rotor.

Abstract: A high consistency pressure screen comprises a screen including a profiled inner surface and a rotor including a profiled outer surface rotating adjacent and spaced from the profiled screen to produce a positive-negative pulsation cycle of approximately 50%--50%.

Abstract: A vacuum roll transfer apparatus is disclosed for drying a web extending through a single tier dryer section of a paper machine. The apparatus includes a rotatable perforate shell having a first and a second end. A stationary duct is disposed within and along the length of the shell between the ends of the shell. The duct is connected to a source of partial vacuum and the shell defines a plurality of holes along the length thereof such that is use of the apparatus, when the duct is connected to the source of partial vacuum, a partial vacuum is generated within a chamber defined between the shell and the duct. A flow restricting arrangement is disposed within the duct for generating a greater vacuum level adjacent to at least one of the ends of the shell for facilitating threading of a tail of the web.

Abstract: A bearing blanket is disclosed for an extended nip press of a papermaking machine. The blanket (44) includes a base (46) having a first and a second side (48, 50). A first laminate (52) extends along the first side (48) of the base (46), the first laminate (52) having an interface (54) which is disposed contiguous with the first side (48) of the base (46) and a face (56) which cooperates with a hydraulically loaded shoe (22) of the extended nip press (12). A second laminate (58) extends along the second side (50) of the base (46) with the second laminate (58) having a surface (60) which is disposed contiguous with the second side (50) of the base (46). The second laminate (58) defines a plurality of recesses (64, 66) for relieving fluid pressure during passage through the nip. The first laminate has a hardness which permits flexing of the first laminate while the second laminate has a hardness such that crushing of the recesses during passage through the extended nip is inhibited.

Abstract: A press section apparatus defining a press nip is disclosed for pressing a web of paper. The apparatus includes a frame and a press member secured to the frame. A backing roll is rotatably secured to the frame with the backing roll cooperating with the press member for defining therebetween the press nip. The backing roll also includes a shaft which has a first and a second end. The ends of the shaft are secured to the frame and a shell defines a granite outer surface with the shell being disposed substantially coaxially relative to and around the shaft. The shell is rotatable relative to the shaft and a deflection compensating device compensates for relative deflection between the shell and the press member during passage of the web through the press nip.

Abstract: A vacuum guide roll apparatus is disclosed for guiding a web between an upstream dryer and a downstream dryer of a dryer section. The apparatus includes a perforate roll shell having a first and a second end. The shell defines an elongate chamber which extends between the first and the second ends. A first and second shaft are rigidly secured to and disposed coaxially relative to the shell. The shafts are disposed adjacent to the first and second ends respectively of the shell. The shafts define respectively a first and second journal. A first and second bearing cooperate with the first and second journals respectively for rotatably supporting the roll shell. A housing is disposed coaxially relative to the shell and adjacent to one of the shafts. The housing defines a passageway which is connected to a source of partial vacuum. A first annular seal is disposed between the housing and the one shaft for sealing the housing relative to the one shaft.

Abstract: An enclosed extended nip press apparatus is disclosed for pressing water from a formed web. The apparatus includes a frame and a backing roll rotatably secured to the frame. A press member cooperates with a backing roll for defining therebetween an extended nip for the passage therethrough of the formed web. A press blanket extends in a closed loop through the nip, the blanket having a first and a second lateral edge and an inner and an outer surface. A first and a second head are rotatably secured to the press member with the first and second heads being disposed adjacent to and cooperating with the first and the second edges respectively of the blanket. The first and the second heads define first and second annular channels respectively for the reception therein of the first and the second lateral edges respectively of the blanket. A first and a second annular seal are disposed within respectively the first and the second channels with the seals contacting the respective edges of the blanket.