US3791920A - Suction box arrangement for papermaking machine having partition wall between the top and bottom - Google Patents

Suction box arrangement for papermaking machine having partition wall between the top and bottom Download PDF

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Publication number
US3791920A
US3791920A US00147401A US3791920DA US3791920A US 3791920 A US3791920 A US 3791920A US 00147401 A US00147401 A US 00147401A US 3791920D A US3791920D A US 3791920DA US 3791920 A US3791920 A US 3791920A
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United States
Prior art keywords
mask element
suction box
opening
mask
false bottom
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Expired - Lifetime
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US00147401A
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English (en)
Inventor
H Nisser
E Schoffmann
J Wolf
W Schoen
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JM Voith GmbH
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JM Voith GmbH
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Priority claimed from DE19702029212 external-priority patent/DE2029212C/de
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/52—Suction boxes without rolls

Definitions

  • the mask elements can be slidably moved by rods which extend through the side walls of the suction box to adjust the positioning of the mask elements in a direction parallel to the plane of the partition wall.
  • the mask elements may be, for example, rectangular or trapezoidal in shape, and may be mounted in flexible or swivelable fashion.
  • the present invention relates to papermaking machines and is particularly concerned with arrangements for controlling the draining of water from the fibrous suspension from which the web is formed as the suspension is supplied to a foraminous member such as a Fourdrinier wire or a cylinder.
  • the present invention is particularly concerned with a papermaking machine having a closed head box wherein the upper wall inclines downwardly toward the machine wire at an acute angle and defines with the wire a formation zone while beneath the wire along the formation zone there are provided suction boxes to withdraw water from the suspension through the wire and thereby to cause a paper web to form on the wire.
  • the channel along the formation zone, which is formed by the walls of the head box, is maintained filled throughout the full length thereof.
  • One way of regulating the rate at which water is withdrawn from various regions of the formation zone is to provide several suction units or suction boxes beneath the wire along the formation zone which are equipped individually, or in groups, with means for regulating the water removed thereby from the suspension. It is well known with suction units of this nature to control the value of the negative pressure developed in each suction unit, or in each group thereof, but this is not satisfactory for achieving the regulation of fiber deposition desired.
  • the problem to be solved by the present invention is, thus, that of how to obtain a uniform velocity of the liquid withdrawn from the fibrous suspension across the entire area of each individual suction box.
  • a primary object of the present invention is the provision of an arrangement for making the velocity of the liquid drawn into each suction box of a papermaking machine of the nature referred to substantially constant over the entire area of the suction box.
  • Another object of the present invention is the provision of an arrangement for adjusting the velocity with which the liquid streams into a suction box in different portions of the suction box.
  • a still further object of the present invention is the .provision of a suction box arrangement for a papermaking machine of the nature referred to in which several boxes are distributed in the direction of movement of the machine wire in which the individual suction boxes complement each other and result in uniform deposition of fibers on the machine wire across the full width thereof.
  • Still another object of the invention is the provision of a suction box arrangement of the nature referred to in which the velocity at which liquid is drawn into the box can be finely adjusted in various lateral regions of the box thereby to provide for desired liquid withdrawing conditions across the entire width of the wire passing over the box.
  • FIG. 1 is a section through a suction box constructed according to the present invention with the plane of the section parallel to the direction of a movement of the machine wire;
  • FIG. 2 is a sectional view like FIG. 1 showing a somewhat different arrangement
  • FIG. 3 is a graph showing the manner in which the velocity of the liquid drawn into the box of FIG. 1 varies across the width of the box considered in the direction of wire movement;
  • FIG. 4 is a view like FIG. 3 but shows the distribution of liquid velocity across the section box of FIG. 2 considered in the direction of movement of the machine wire;
  • FIG. 5 is a section indicated by line V-V on FIG. 6 and shows a suction box arrangement with the machine wire running perpendicularly to the plane of the drawing;
  • FIG. 6 is a sectional view indicated by line VI-VI on FIG. 5 showing the subdivisions of the suction box;
  • FIG. 7 is a plan sectional view indicated by line VII- --VII on FIG. 5 showing control members in the suction box for regulating the rate of liquid flow into the box;
  • FIG. 8 is a sectional view indicated by line VIIIVIII on FIG. 9 showing a different arrangement for controlling the distribution of liquid flow into a box;
  • FIG. 9 is a sectional view indicated by line IXIX on FIG. 8;
  • FIG. 10 is a sectional view indicated by line X-X on FIG. 11 which shows an arrangement somewhat similar to that of FIG. 8 but including an additional flow control member;
  • FIG. 11 is a sectional view indicated by line XI-XI on FIG. 10;
  • FIG. 12 is a fragmentary view similar to FIGS. 8 and 10 but drawn at enlarged scale showing a still further modification
  • FIG. 13 is a sectional view indicated by line XIIIX- III on FIG. 14 and showing a modified arrangement in which the flow controlling member is in the form of a belt;
  • FIG. 14 is a vertical sectional view indicated by line XIV-XIV on FIG. 13;
  • FIG. is a plan sectional view indicated by line XVXV on FIG. 16 and showing still another modification
  • FIG. 16 is a sectional view indicated by line XVI- -XVI on FIG. 15;
  • FIG. 17 is a plan sectional view similar to FIG. 15 and is indicated by line XVlI-XVII on FIG. 18;
  • FIG. 18 is a sectional view indicated by line XVIII- XVIII on FIG. 17.
  • the suction boxes positioned beneath the wire and the web formation zone are provided with foraminous upper walls over which the machine wire moves and through which liquid is drawn into the respective box.
  • Each box has a suction connection near the bottom for withdrawing liquid therefrom and each box, furthermore, has an intermediate partition, or false bottom, dividing the respective box into upper and lower chambers.
  • the intermediate partition has aperture means therein and by selecting the location of the aperture means, and/or the distribution thereof when more than one aperture is provided, or by providing adjustable members for controlling the effective size of the aperture means, the velocity at which liquid is drawn into each suction box and the distribution thereof across the area of the suction box can be closely regulated.
  • the invention is adaptable to machines in which a wire runs in a plane over a plurality of suction boxes or to a cylinder type machine in which suction boxes are arranged inside a cylinder.
  • the formation zone for the web being formed and which is located over the suction boxes, is supplied with fibrous suspension by way of a head box having confining side walls and a confining top wall converging with the machine wire or the machine cylinder in the direction of movement thereof so as to form a completely closed head box that is continuously filled with suspension.
  • the problem of maintaining the fiber deposition on the machine wire substantially uniform across the width of the wire is solved according to the present invention by providing a flat suction box, the top of which is open to the bottom of the wire, while the bottom of which is provided with at least one discharge opening, and disposing in the box between the top and bottom is a partition member extending substantially parallel to the wire and having at least one opening therein communicating with the chamber above the partition wall and which opens to the bottom of the wire with the chamber below the partition wall and which is communicated to the discharge conduit.
  • the velocity of the liquid entering the suction box can be adjusted with respect to either the width of the suction box laterally of the direction of movement of the wire or longitudinally in the direction of movement of the wire. It is possible to influence the pressure distribution inside such a box so that the pressure difference between the upper side of the machine wire and the portion of the suction box beneath the wire is substantially the same across the entire area of the suction box.
  • Suction boxes in general, are wide in the direction of the width of the wire and somewhat more narrow in the direction of movement of the wire.
  • the suction box in any case, presents a substantially greater area to the wire than is presented to the suction box by the discharge conduit connected thereto, whereby the liquid entering the wire side of the suction box at different regions will have different distances to flow to the discharge conduit.
  • the strongest stream of liquid into a suction box will be disposed directly over an aperture in a partition wall and decrease in directions away from the aperture toward the vertical confining walls of the suction box.
  • the partition wall it is possible, according to the present invention, so to adjust and locate apertures in the partition wall in the suction box that substantially uniform liquid flow conditions will exist across the entire area of the suction box.
  • the partition wall it is also convenient to provide the partition wall with one or more apertures with which there is associated adjustable control members, in the form of mask elements, for example, for varying the effective flow through area of the respective apertures.
  • adjustable control members in the form of mask elements, for example, for varying the effective flow through area of the respective apertures.
  • the control member consists of a moveable belt or a band apertured in a certain manner and disposed on the partition wall.
  • each suction box is provided with a partition wall between the top and bottom thereof which has apertures therein, and the apertures from one box to the next may be staggered relative to each other in the direction transverse to the direction of wire movement.
  • One convenient manner of obtaining staggered openings is to provide alternate ones of the suction boxes with an even number of apertures in the partition walls thereof and the others with an odd number of apertures in the respective partition walls.
  • the mask elements which are adjustable to vary the effective flow through areas of the respective apertures in the partition walls, may be slidably supported on the partition wall so as to be adjustable for more or less covering a respective aperture, or the mask elements can be tiltably supported on a partition wall as by being mounted on a rock shaft and swing about the axis of the supporting rock shaft for covering a respective aperture an adjustable amount.
  • the mask element employed is flexible in a direction parallel to the plane of the respective partition wall and can thus be adjusted as to contour so as to vary the area of the pertaining aperture predetermined amounts in selected regions thereof.
  • Such a mask element might be made flexible by slits extending therein, for example.
  • FIG. 1 there is shown a flat suction box having a horizontal perforated top or cover member 22 across which moves a machine wire 21 in the direction of the arrow P.
  • the suction box has vertical lateral walls 23 and 24 and a bottom wall 26 extending substantially horizontal and being provided in about the middle with a discharge conduit 25.
  • an intermediate partition wall, or false bottom, 27 which divides the suction box into an upper chamber 28 communicating with the bottom of wire 21 and a lower chamber 29 communicating with discharge conduit 25.
  • aperture 30 providing communication between chambers 28 and 29.
  • aperture 30 is arranged fairly close to wall 24 and the flow pattern of liquid drawn through wire 21 and flowing through chamber 28 to aperture 30 is indicated by the lines R.
  • FIG. 2 shows a suction box substantially the same as that illustrated in FIG. 1 and bearing the same reference numerals, and differing from FIG. 1 only in that aperture 30 in FIG. 2 is located in about the middle of partition wall 27, substantially midway between lateral walls 23 and 24.
  • FIGS. 3 and 4 will show how the placement of the aperture 30 in the partition wall influences the flow velocity through wire 21 over the region thereof between walls 23 and 24.
  • the velocity, or quantity, of fluid is represented by the ordinate O which will be seen, in FIG. 3, to be greatest in the region over aperture 30 of FIG. 1, which is to say, the flow rate charted increases from lateral wall 24 to about the center of aperture 30 and then steadily diminishes toward lateral wall 23.
  • FIG. 4 shows that the flow velocity in FIG. 2 is greatest immediately over the centrally located apertures 30 and diminishes in both directions therefrom toward lateral walls 23 and 24.
  • the suction boxes in FIGS. 1 and 2 are disposed beneath the wire 21 along a formation zone thereof with suspension being supplied to the top of the wire along the suspension zone by a closed head box, which has, for example, vertical side walls extending in the direction of wire movement near the ends of the suction boxes and a confining top wall which inclines downwardly at an acute angle toward the wire in the direction of movement of the wire, so as to leave a slit-like opening at the exit end through which the web developed in the formation zone will pass.
  • a head box which is known and which is not, therefore, illustrated in detail herein, is maintained filled with suspension at all times during the operation of the machine.
  • FIGS. 1 and 2 are adapted for use in a Fourdrinier machine in which a wire runs in a generally horizontally extending plane, but the invention is also useful in respect of cylinder type machines in which the head box supplies suspension to the outer surface of a rotating cylinder and suction boxes are disposed inside the cylinder opposite the head box. All of the illustrations herein are of a Fourdrinier type machine.
  • a suction box unit illustrated is divided into three adjacent sections 40, 40" and 40" in the direction of movement P of wire 41.
  • the top wall of the suction box unit may incline upwardly rather steeply in the direction of wire movement.
  • the suction box unit comprises the vertical frontal walls 43 and 44 and at the fore and aft sides, with respect to the direction of wire movement, is confined by the vertical walls 43A and 438.
  • the individual sections of the suction box unit are formed by two vertical intermediate walls 44A and 44B parallel to and spaced from walls 43A and 43B.
  • the suction box unit has a bottom wall 46 common to all of the sections thereof and intermediate partition walls 47, 47" and 47", which may be substantially coplanar, and which are disposed between the upper and bottom walls of the individual suction box units.
  • connections 45 45" and 45" for the respective suction box sections for connection to individual discharge conduits.
  • Each of the aforementioned partition walls divides the respective suction box into an upper chamber 48, 48" and 48" and a respective lower chamber 49, 49 and 49".
  • the respective upper and lower chambers of each suction box communicate with each other via apertures 50', 50" and 50", respectively, with the apertures in each partition wall being distributed laterally to the direction of movement of the machine wire and preferably staggered from one suction box to the next in the direction of movement of the machine wire.
  • Each of the aforementioned apertures has associated therewith a flow control member in the form of a slidable mask element as indicated 51', 51" and 51", and to each of which is connected a respective push rod 52.
  • Each push rod extends sealingly through one of the walls 43 or 44 of the suction box unit and is advantageously provided with an adjusting handle 53 so that the respective mask elements can be adjusted with respect to the pertaining apertures to vary the effective area thereof.
  • the selection of the sizes of the apertures in the respective partition walls and the location thereof and the adjustment of the respective mask elements provides for the establishment of conditions of liquid flow in the suction boxes which is quite uniform across the entire width of the boxes and which will bring about a uniform deposition of fibers upon the machine wire.
  • FIGS. 8 and 9 a flat suction box 60 is illustrated which has frontal walls 63 and 64 and a partition wall 67 dividing the suction box into an upper chamber 68 and a lower chamber 69 which are in communication by way of an elongated aperture 70 formed in partition wall 67.
  • Aperture 70 extends substantially the entire width of machine wire 61 and is substantially rectangular while being spaced from the aforementioned walls 63 and 64 and also from the walls 63A and 6313 which are fore and aft of suction box 60 in the direction of wire movement.
  • a generally trapezoidal, or trapezium, shaped mask member 71 is employed, having a smaller end fixed to a rock shaft 72 that extends downwardly and through bottom wall 66 of the suction box where it is connected to a lever 73 to which a pull rod 75 is connected and which has a handle 74.
  • the edge of member 71 extending over aperture 70 may be rectilineal, as shown at 76 in full lines, or it may be configured in some other manner, such as curvilineal as indicated by the dot-dash line 77 in FIG. 8.
  • FIGS. and 11 show an arrangement somewhat similar to that of FIGS. 8 and 9, except that the flat suction box 80 in FIGS. 10 and 11, elongated in the direction of the width of the machine and having a bottom wall 86 and vertical walls 83 and 84 at the narrow ends the suction box, is provided with two discharge outlets 85 and 85' disposed near the narrow ends of the suction box.
  • the machine wire 81 runs on top of the suction box in the direction indicated by arrow P, and the suction box comprises an intermediate partition wall 87 having an elongated aperture 90 therein.
  • two mask elements 91 and 91' are provided, and these are advantageously supported on respective rock shafts 92 and 92 which extend vertically downwardly through the partition wall 87 and bottom wall 86 and have respective actuating levers 93 and 93' thereon to which are connected respective adjusting rods 95 and 95' having handles 94 and 94'.
  • the mask element 91' is slotted to permit rock shaft 92 to pass therethrough because the mask elements are arranged in overlapping relation near the lateral center of the suction box.
  • the aperture 90 can be variably restricted in the regions nearest each of the discharge connections thereby to provide for uniform flow velocity conditions across the entire area of the suction box.
  • the mask elements can have straight leading edges, as indicated at 96 and 96', or these edges can be configured in a different manner as, for example, in a curved manner as shown by the dot-dash lines 97 and 97'.
  • FIG. 12 which is drawn at somewhat enlarged scale, and which shows an arrangement somewhat similar to that of FIG. 10, the suction box 100 is provided with a vertical wall 103 at the narrow end, from which leads a discharge opening 105.
  • the intermediate partition wall 107 has an elongated aperture 110 therein. This aperture is adapted for being variably restricted at one end by mask element 111 and at the other end by mask element 121 and at which other end is preferably a further discharge connection, not shown.
  • Mask element 111 is mounted on a rock shaft 1 12 for pivotal movement laterally of aperture 110.
  • mask element 121 is mounted on a rock shaft 122.
  • rock shafts 112 and 122 have attached thereto, beneath the suction box, respective actuating levers 113, 123 to which are connected rods 115, 125 for tilting of the mask elements.
  • Mask element 111 at a point thereon remote from rock shaft 112, supports an additional mask element or blade 119 on a rock shaft 120 having connected thereto a lever 126 and to which is connected a rod 127 which leads to a lever 128 mounted on rock shaft 112.
  • Lever 128 may, for example, be fixed to a hollow shaft concentric with rock shaft 112 and have an actuating lever thereon for adjusting mask element 119 independently of mask element 111.
  • rock shafts extend downwardly through the bottom wall of the suction box and mask element 121, which is beneath mask element 111, as viewed in FIG. 12, is slotted to permit rock shaft 122, and the hollow shaft on which lever 128 is mounted, to pass therethrough.
  • FIGS. 13 and 14 show a modified arrangement in which a suction box is provided with a discharge chamber 149 beneath the partition wall 147 therein.
  • the partition wall is provided with an enlarged aperture 150 and mounted in chamber 149 is a pair of pulleys 142 and 152 about which is entrained a band 141 which is fluid impervious as, for example, being formed of a rubber-like material or metal.
  • Band 141 is provided with the opening 158 and the openings 148. Opening 158 is disposed in operative relation with aperture 150 and can be adjusted therealong by rotation of a crank 156 mounted on a shaft 159 extending through a bearing and having a gear 154 inside the suction box meshing with a gear 153 fixed to pulley 152.
  • a locking device at 157 is provided for locking the belt in any selected adjusted position in the suction box.
  • the flow through aperture at 158 can be of any selected shape or size in order to obtain the flow conditions desired.
  • the apertured region at 148 of the belt permits the aspirated water to pass freely to the bottom of the suction box and to flow out the discharge conduit 145.
  • the suction box means 160 is provided with frontal walls 163 and 164 and a bottom wall and an intermediate partition wall 167 forming an upper chamber 162 immediately beneath the wire moving over the suction box.
  • Partition wall 167 has an elongated aperture 170 therein near a vertical confining wall 168 which is on the upstream side of the suction box with respect to the direction of wire movement.
  • a mask element 171 Adjacent one side edge of aperture 170, namely, the edge 176 nearest wall 168, is a mask element 171 having associated therewith near one end a push rod 172 that extends swivelly and reciprocably through wall 163. At a point along mask element 171 spaced from wall 163 is a control lever 178 pivoted to the mask element and to the partition wall.
  • the mask element adjacent rod 172 carries a pivoted bearing 179 through which the rod extends and also has an inclined slot 180 through which a trunnion member or pin on rod 172 extends.
  • the arrangement is such that mask element 171 can be adjusted in parallelism with itself relative to edge 176 of aperture 170.
  • Aperture 170 has another edge 177 spaced from edge 176 and associated therewith is a second mask element 181 which is flexible in its own plane, namely,
  • Mask element 181 can consist of a relatively thin flexible material, such as a rubberlike material, or metal and the flexibility thereof may be enhanced by slits 193 extending therein from the side opposite aperture 170. These slits may extend rather deeply into the mask element up to a point close to the edge 177 but preferably not far enough to expose aperture 170.
  • an inclined slit or slot 182 which may be reinforced along the lateral edges and into each of which extends a trunnion element 185 connected to a respective push rod 173.
  • the push rods are sealed to the adjacent frontal walls 163, 164 of the box and are guided for straight line movement therein, for example, by guide means attached to the partition wall.
  • Each of these last mentioned inclined slots and which also may be laterally reinforced, receive respective trunnions 185 connected to respective push rods 174i, 175 which extends sealingly through the frontal walls of the suction box and which are guided for straight line movement as by the guide eyes 179 mounted on the partition wall.
  • the extension parts 188, 189 may advantageously be provided with guide rods 191, 192 and guide rods 190 may be provided connected to mask element 171 near the ends. These guide rods extend guidingly through wall 169 of the suction box and prevent the mask element from moving therein in the direction of the length thereof.
  • the edge of mask element 171 facing aperture 170 may be straight or curved or it may be somewhat wavelike as shown in FIG. 15.
  • FIGS. 17 and 18 In the modification of FIGS. 17 and 18, an arrangement is shown which is somewhat similar to that of FIGS. and 16.
  • flat suction box 190' has an intermediate partition wall 197 dividing the suction box into an upper chamber 192' and a lower chamber 205.
  • Leading from lower chamber 205 is a discharge connection 209.
  • the suction box has walls 198 and 204 spaced in the direction of movement of the wire and the partition wall 197 has an elongated aperture 200 closer to wall 198 than to wall 204.
  • Pertaining to aperture 200 is a mask element 191' which is adjacent the downstream edge 207 of aperture 200 and spaced from upstream edge 206 thereof.
  • the mask element is provided with slits 193' extending therein to impart flexibility thereto while spaced extension members 195, thereon, and free of slits, are provided for connection of the mask element to the push rods 201, 202 and 203, which extend sealingly through wall 204.
  • the mask element can be adjusted relative to the aperture and can be flexed or bent in its own plane thereby to vary the change in the flow through area of specific regions along aperture 200.
  • the edge of the mask element facing aperture 200 may be straight or curved or inclined or it may be, as shown, somewhat wave-like in configuration.
  • the suction box is formed with a recess 208 between wall 204 and wall 199 of the next adjacent suction box into which the outer ends of the push rods extend for ready access thereto.
  • a suction box for a papermaking machine; said box extending laterally of said machine and having a top wall over which a machine wire slides and which top wall is fluid pervious, said box also having side wall means and a bottom wall, suction means connected to a lower region of said suction box, and a false bottom in said suction box between said top wall and said lower region, said false bottom having at least one opening therein for liquid flow downwardly through said false bottom, mask element means adjacent said opening, and control means connected to said mask element means and extending through said side wall means for adjustment of said mask element means in a direction parallel to the plane of the false bottom to control the effective area of said opening exposed for liquid flow, said mask element means engaging said false bottom and being disposed in spaced relation to the underside of said top wall whereby adjustment of said mask element means influences only the opening in said false bottom.
  • a suction box according to claim 1 in which a plurality of openings are arranged in said false bottom in spaced relation in the lateral direction of said suction box, and said mask element means comprising an independent mask element for each said opening.
  • a suction box according to claim 1 in which said opening comprises a single opening elongated in the lateral direction of said machine, and said mask element means comprising a single mask element slidably mounted on said false bottom.
  • a suction box according to claim 3 in which said mask element in plan is substantially the shape of a trapezium, a rock shaft near one side of the suction box pivotally connecting the narrow end of said mask element to said false bottom, said mask element being disposed on top of said false bottom.
  • a suction box according to claim 4 which includes a second and smaller mask element also substantially trapezium shaped when viewed in plan, the larger end of said second mask element being near the larger end of the first mentioned mask element and the smaller end of the second mask element being spaced along the first mentioned mask element from the larger end thereof, means pivotally connecting the smaller end of said second mask element to the first mentioned mask element, and said control means includes a respective control means for each mask element.
  • a suction box according to claim 1 in which said opening is in the form of a single elongated opening extending transversely of said suction box, said mask ele ment means comprising a mask element supported on said false bottom adjacent one lateral edge of said opening and flexible in a direction parallel to said false bottom, and said control means comprising independent adjusting elements connected to said mask ele ment at points spaced along the length thereof and each operable for adjusting the adjacent region of the mask element in the lateral direction of said opening.
  • a suction box in which said opening comprises-a single opening elongated in the lateral direction of said machine, and said mask element means comprises a pair of mask elements on said false bottom disposed adjacent said opening at one side thereof with the adjacent ends in overlapping relation, pivot means perpendicular to the plane of said false bottom pivotally connecting said adjacent ends of said mask elements to said false bottom, said mask elements forming a scissor-like arrangement for controlling the said opening, said control means including a respective control element connected to each mask element.

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US00147401A 1970-06-13 1971-05-27 Suction box arrangement for papermaking machine having partition wall between the top and bottom Expired - Lifetime US3791920A (en)

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DE19702029212 DE2029212C (de) 1970-06-13 Saugkasten für eine Papiermaschine

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US3791920A true US3791920A (en) 1974-02-12

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FI (1) FI51385C (sv)
FR (1) FR2109616A5 (sv)
GB (1) GB1340213A (sv)
SE (1) SE385030B (sv)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2830046A1 (de) * 1977-09-21 1979-03-29 Tampella Oy Ab Verfahren und einrichtung zur regelung des querprofils der faserbahn in einer papiermaschine
WO1987006633A1 (en) * 1986-04-30 1987-11-05 Viljo Klemetti Method for regulating the cross-direction profile of a paper web and equipment for the application of the method
US5865903A (en) * 1997-01-21 1999-02-02 Duncan; James W. System and method for removing liquid applied to hollow containers
US6331268B1 (en) * 1999-08-13 2001-12-18 First Quality Nonwovens, Inc. Nonwoven fabric with high CD elongation and method of making same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109098028B (zh) * 2018-10-15 2019-08-16 维达纸业(浙江)有限公司 一种纸机真空吸水箱面板及其改造方法

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DE233618C (sv) *
AT26413B (de) * 1905-07-10 1906-11-26 Gustav Adam Saugkasten für Papiermaschinen.
US1375517A (en) * 1920-04-19 1921-04-19 Johnson George Shepherd Suction-box for paper-making machines
US1664801A (en) * 1926-02-19 1928-04-03 Rice Barton & Fales Inc Suction box
US1790852A (en) * 1927-11-14 1931-02-03 Beloit Iron Works Suction box
AT281581B (de) * 1965-09-03 1970-05-25 Voith Gmbh J M Siebpartie einer Langsiebpapiermaschine
US3539448A (en) * 1968-04-19 1970-11-10 Kasimir Lopas Suction box for papermaking apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE233618C (sv) *
AT26413B (de) * 1905-07-10 1906-11-26 Gustav Adam Saugkasten für Papiermaschinen.
US1375517A (en) * 1920-04-19 1921-04-19 Johnson George Shepherd Suction-box for paper-making machines
US1664801A (en) * 1926-02-19 1928-04-03 Rice Barton & Fales Inc Suction box
US1790852A (en) * 1927-11-14 1931-02-03 Beloit Iron Works Suction box
AT281581B (de) * 1965-09-03 1970-05-25 Voith Gmbh J M Siebpartie einer Langsiebpapiermaschine
US3539448A (en) * 1968-04-19 1970-11-10 Kasimir Lopas Suction box for papermaking apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2830046A1 (de) * 1977-09-21 1979-03-29 Tampella Oy Ab Verfahren und einrichtung zur regelung des querprofils der faserbahn in einer papiermaschine
WO1987006633A1 (en) * 1986-04-30 1987-11-05 Viljo Klemetti Method for regulating the cross-direction profile of a paper web and equipment for the application of the method
US5865903A (en) * 1997-01-21 1999-02-02 Duncan; James W. System and method for removing liquid applied to hollow containers
US6331268B1 (en) * 1999-08-13 2001-12-18 First Quality Nonwovens, Inc. Nonwoven fabric with high CD elongation and method of making same

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DE2029212A1 (de) 1971-12-30
FI51385C (sv) 1976-12-10
FI51385B (sv) 1976-08-31
SE385030B (sv) 1976-05-31
GB1340213A (en) 1973-12-12
FR2109616A5 (sv) 1972-05-26

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