Abstract:
A headbox (10) is disclosed for ejecting stock onto a forming wire (12) of a papermaking machine. The headbox includes an upper, lower, first and second side wall (26, 28, 18, 20), with each of the side walls (18, 20) extending between the upper and the lower walls (26, 28) such that the upper, lower and side walls define therebetween a slice chamber (30) for the passage therethrough of a primary flow (32) of the stock. A secondary flow of stock (36) is injected laterally relative to the primary flow (32) such that the secondary flow (36) extends through the side walls (18, 20) for controlling fiber orientation along the lateral side edges (38, 40) of the stock ejected from the headbox (10) onto the forming wire (12).
Abstract:
An apparatus (10) for drying a web (12) of paper emerging from a press section (14) of a papermaking machine. The apparatus (10) includes a first dryer section means (16) for initiating the drying of the first side (18) of the web (12). A first transfer arrangement (20) transfers the web (12) from the press section (14) to the first dryer section (16). A second dryer section (22) is disposed downstream relative to the first dryer section (16) for initiating the drying of a second side (24) of the web (12), the second side (24) of the web being opposite to the first side (18) thereof. A first dryer transfer arrangement (25) transfers the web without open draw between the first and second dryer sections (16, 22). The first dryer transfer arrangement (25) permits both threading of the web without the assistance of threading ropes and the drying of both sides of the web.
Abstract:
A paper web dryer section (5) has horizontal upper and lower tiers of dryers (7, 8) defining generally triangular pockets (9). An endless dryer felt (10) is trained to run a paper web (W) sinuously successively and in direct contact on the upper perimeter areas of the upper (7) and lower (8) tier dryers. Broke is ejected downwardly from the pocket (9). To facilitate such broke ejection, dryer felt roll wrap enhancing felt rolls (19, 20) in the pockets are especially oriented for this purpose and define a respective broke-receiving and ejecting subpocket (21) under the upper tier dryers (7) at each pocket (9).
Abstract:
A jet velocity measuring apparatus for measuring the velocity of a fluid stream. The apparatus (10) measures the time delay between primary electronic signals generated by a first photosensitive device (32) as a result of a first beam of light from a light source (34) being reflected by a portion of the surface (S) of the stream (24) and secondary electronic signals generated by a second photosensitive device (36) as a result of a second beam of light from a light source (38) being reflected downstream by substantially the same portion of the surface of the stream (24). The apparatus includes a housing (22) disposed parallel to the plane (P2) of the surface of the stream. A first and a second fiberoptic bundle (42, 44) transmit light from the light source (34, 38) to the surface of the stream (24) and back respectively to the photosentive devices (32, 36). Debris-deflecting slots (88, 90) are disposed adjacent to the housing (22) for deflecting debris therefrom.
Abstract:
A control apparatus for controlling the differential pressure between steam inlet (12) and outlet (14) lines of a web dryer (16) and includes a selectively controllable outlet valve (22) disposed in the outlet line for selectively controlling the flow of blowthrough steam, condensate and non-condensible gases out of the dryer. A dryer speed sensor (30) generates a first control signal and a condensing rate sensor (32) senses the rate at which a layer of condensate builds up within the dryer. The condensate rate sensor (32) generates a second control signal. A control device (38) is operably connected to an outlet valve actuator (28) for selectively energizing the actuator in response to the first and second control signals. The control device compares the signals to determine the optimum relative setting of the outlet valve so that flooding of the dryer with condensate is inhibited while the differential pressure between the inlet and outlet lines is maintained as low as possible.
Abstract:
A sealing device for sealing a securing device (17) which extends through adjacent flanges (7, 9) of a shell (1) and of a head (3) of a fluid container. The sealing device includes an O-ring seal (23) which slidingly engages the securing device (17) for sealing the securing device relative to the flange (9) of the head. A carrier member (25) through which the securing device extends is urged towards the flange (9) of the head such that the O-ring seal (23) is urged into sealing engagement between the securing device (17) and the flange (9) of the head. The carrier member (25) defines a conical recess (35) for reception therein of the O-ring seal (23) such that when the carrier member (25) is urged towards the flange (9) of the head, the O-ring seal (23) is distorted by reaction between the carrier member (25), the securing device (17) and the flange (9) of the head so the securing device (17) and the flange (9) of the head are sealed relative to each other.
Abstract:
An apparatus and method for screening paper machine stock using a fabricated foil (16) and moving the foil along the arcuate surface of a cylindrical screen (14), with the foil formed of curved inner and outer plates (20 and 21) with supporting flat plates (24 and 25) with arcuate edges therebetween and a blunt leading surface (23) connecting leading edges of the curved inner and outer plates.
Abstract:
A roller (10) used as support, backing or driven roller in winding devices, is composed of an outer cylindrical roller element (24), on which an elastic, flexible intermediate layer (26) of elastomeric material is applied. On the intermediate layer (26), an external roller mantle (33) of thin-wall spring steel is provided that can be deformed in a plane perpendicular to the axis due to the contact pressure of the roll (2) and can be pressed against the outer perimeter of the roll (2). A broad contact region is created, which leads to a lower specific nip pressure and to a smaller package hardness. Channels (27, 28) in the intermediate layer (26) serve to increase the flexibility and cooling.
Abstract:
An apparatus and method for cutting a traveling web (W), such as a paper or board sheet, in the cross-machine direction to enable the on-coming web to be turned-up and attached to a new core (24), or spool, to be wound into a roll. Two water jets (40, 42) have their jet streams (75) aimed at the same point near the middle of the web and are then guided laterally across the moving web in opposite directions. The jet streams (75) initially pierce the web at a point (77) and then cut the web outwardly to either edge (30, 32) of the web. The outline of the cut web is in a shallow "V" shape. The center of the web is then guided upwardly and onto the surface of a new core where it begins to be wound into a new roll.
Abstract:
A method for effecting a set change in a winder (14) for a papermaking machine, comprises skip-slitting the paper web (W) across the width of the web (W) transversely to the direction of web travel in the winder (14). An adhesive stripe (44, 44') is applied to the web (W) on either side of where the skip-slit (50) is located. The skip-slit (50) and application of the glue is done at a location upstream of the winder (14) to avoid the problems associated with mounting and operating such equipment beneath the winder (14). The paper web (W) is severed by advancing the skip-slit (50) to a position near the 10 o'clock position over the surface of a first winder drum (12) where the web (W) is halted and the wound paper roll (R) is urged off its support on the first winder drum (12) to thereby increase the tension in the web between the wound roll (R) and web (W) supported on the first winder drum (12) to sever the web. The adhesive stripes (44, 44') on either side of the severance are then applied to the wound roll (R) and a new core, and the process is repeated.