US3642573A - Wet process apparatus for making nonwoven fabrics - Google Patents

Wet process apparatus for making nonwoven fabrics Download PDF

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Publication number
US3642573A
US3642573A US840940A US3642573DA US3642573A US 3642573 A US3642573 A US 3642573A US 840940 A US840940 A US 840940A US 3642573D A US3642573D A US 3642573DA US 3642573 A US3642573 A US 3642573A
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US
United States
Prior art keywords
belt
screen
stock
wire
endless
Prior art date
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Expired - Lifetime
Application number
US840940A
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English (en)
Inventor
Heinz Genz
Dieter Berger
Horst Seeliger
Karl Schmidt
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Feldmuehle AG
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Feldmuehle AG
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Filing date
Publication date
Application filed by Feldmuehle AG filed Critical Feldmuehle AG
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Publication of US3642573A publication Critical patent/US3642573A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type

Definitions

  • SACT Apparatus for the manufacture of nonwoven fabrics on papermaking or papermaking type of machines in which fibers are deposited on an endless wire screen passing on an incline through a stock tank containing a water-fiber stock, the apparatus including an endless belt of a width substantially the same as the width of the screen in the stock tank, support ele ments for adjustably mounting the belt in the stock tank, a variable speed drive for the belt and adjustable rolls for adjusting the curve of the belt along the fiber-receiving face of the wire screen.
  • the invention relates to a device for manufacturing flat webs, such as paper, carton, and particularly nonwoven fabric,
  • the wire section of which in the region of the stock run-on is designed in the form of a steeply inclined wire and is equipped with a continuous suction box train, while the velocity'of flow of the stock water, depending on the velocity of flow through the screen, is adapted to the screen speed by devices built into the stock run-on.
  • a further particular disadvantage of the previously known fixed inserts is that the friction between the rigid insert and the rapidly flowing fiber stock suspension can cause a retardation of the suspension flow in the area of contact, leading to uniform orientation of the entrained stock fibers and the danger of vortex formation.
  • the instant invention avoids these disadvantages to produce a flat web of essentially uniform longitudinal and transverse tensile strength ratio.
  • the apparatus of the instant invention used in the production of flat webs, like paper, carton, and particularly nonwoven fabric in a paper machine, in which the wire section, in the region of the web-forming zone, is steeply inclined and is equipped with a continuous suction box train, adjusts the velocity of flow of the stock water, as a function of the velocity of flow through the wire, in relation to the wire speed by means of a revolving, elastic and endless belt opposite to the wire.
  • the elastic belt is guided in the shape ofa curve and this shape is variable.
  • the instant apparatus makes possible the adjustment of the web formation on the steeply inclined wire in response to variations in the stock and process conditions.
  • steeply inclined wires are predominantly used where one type of machine is used to produce a whole series ofdifferent kinds of materials from the thinnest tea bag paper through synthetic card papers, nonwoven clothing fabrics, to heavy mats.
  • This requires an ability to adapt the web-forming conditions to each product and this adaptability is largely furnished by the device of the present invention.
  • the belt runs at wire speed in the direction of the wire, there is, even in the part of the stock suspension touching the belt, no braking and any orientation of the fibers is thereby avoided.
  • a particularly useful embodiment of the invention involves making the belt speed variable. This makes it possible to use the entire paper machine for quite different products and to operate at corresponding speeds.
  • Another useful embodiment of the present invention involves making the entire assembly adjustable with reference to the wire.
  • the advantage is that, as a result, operation with stock suspensions of different dilutions, as determined by different fiber lengths and types, is feasible.
  • Another advantageous embodiment of the invention involves making the parts located between the belt pulleys, which determine the shape of the belt curve, adjustable. With this particular embodiment, one can obtain any arbitrary curve by an adjustment of the parts and the cost of this adjustment is negligible compared to the previous cost ofa complete replacement of a curve and in addition, the large number of fixed curves can thus be eliminated.
  • a further advantage of this design is that, in operations with unknown or unfamiliar dilutions, it is possible to obtain the required optimum curve without any essential expense, simply by adjusting the fixtures. It has proven very useful to make these parts in the form of pulleys, because this reduces the friction between belt and part.
  • the parts may, however, be strips of suitably curveshaped cross section arranged perpendicularly to the belt path.
  • a further preferred design of the device involves having the parts supported inbearings, so as to permit them to pivot about a center of rotation.
  • the advantage of this is that the parts can be very accurately adjusted by being mounted on an eccentric shaft and they are pivoted by turning this shaft.
  • the adjustment of the belt which is to move with the wire is, therefore, accomplished, on one hand, by changing the distance of the entire assembly from the steeply inclined wire, and, on the other hand, by shaping the belt opposite the wire between the guide pulleys by means of curve-forming parts, so that the resulting curve is related to and is a determinant of the amount of water penetrating the screen.
  • the fixture With its manifold adjustability, makes it possible to manufacture an exactly defined product with special longitudinal-transverse strength ratio, for instance, one with an extreme ratio.
  • FIG. l is an elevational view, partly in section of the apparatus of the instant invention.
  • FIG. 2 is a graph of the water extraction curve attained with the apparatus
  • endless screen wire 2 is fed, in conventional manner, around guide rolls 4, 6, through stock tank 8, across the open face of suction boxes 10, 12, 14, 16, 18, each suction box being connected by a pipe to a vacuum source, the suction in each box 10, 12, 14, l6, 18 being adjustable by a valve, not shown, in the pipe connecting the respective box to the suction source or sources.
  • endless screen wire 2 moves, in the direction of the arrow, FIG. 1, through stock tank 8, fibers from the water-fiber stock in the stock tank are deposited on the screen, water being withdrawn from the deposited fibers on the moving endless screen by the suction boxes as is conventional in papermaking or papermaking type machines.
  • endless belt 20 which may be rubber, rubber-treated cloth as suitable belting material, and which has a width substantially equal to the width of the endless wire screen 2 in stock tank 8, passes around rolls 22,
  • Roll 22 is driven, through pulley belt 28, by variablespeed motor 30 in the direction of the arrow, FIG. 1, for purposes hereinafter described.
  • Roll 22 is mounted on support 32 fixed to frame 34, adjustably mounted by screws 36, 38.
  • Roll 24 is mounted on support 40 fixed to frame 34 and roll 26 is mounted on support 42 pivotally mounted in the axis of roll 24 and adjustable by screw adjuster 44 mounted on bracket 46 fixed to support 40.
  • Tension roll 48 is mounted in slot 50 of support 52 fixed to frame 34 and is freely movable upwardly and downwardly of slot 50 to maintain constant tension on belt 20, for purposes more apparent hereinafter.
  • Adjustable roll 54 is mounted on support 56 pivoted, at its opposite end, to support 52.
  • Adjusting screw 58 is connected, at its end, to support 56 and is threaded, at its upper end to frame 34. By adjusting screw 58, adjustable roll 54 is adjusted changing the curve of endless belt between rolls 26, 22.
  • Such adjustment changes the path of travel and spacing of endless belt 20 from endless screen wire 2 along the path of travel of the belt and screen wire. While only one adjustable roll 54 is shown, it is to be un derstood that additional adjustable rolls between rolls 26, 22, may be employed and that, rather than rolls, adjustable belt guides may be substituted.
  • endless screen wire 2 and belt 20 are driven in the direction of the arrows, FIG. 1.
  • the endless belt 20 position in stock tank 2 is adjusted, by screws 36, 38, to raise or lower endless belt 20 and endless belt supporting structure and driving mechanism in the stock tank.
  • the curve of belt 20 is adjusted by adjusting roll 54 and, where additional adjusting rolls are employed, such additional adjusting rolls.
  • the spacing between endless wire screen 2 and belt 20 is adjusted by adjustment of roll 26 through screw adjuster 44.
  • the volume of water withdrawn from through screen 2 and the fibers deposited thereon varies from suction box to suction box, the greater volume of water being withdrawn from lowermost suction box 10, with the volume in each box thereabove decreasing.
  • the curve shape can be controlled by the vacuum applied at each suction box and the stock velocity in tank 8 at each such suction box.
  • the stock velocity is controlled by the spacing between endless belt 20 and endless wire screen 2 by the adjustment of frame 34 and roll 26.
  • the curve of the endless belt 20 is adjusted with adjustable roll, or rolls, 54.
  • the apparatus of the instant invention can be adjusted for optimum production of a wide variety of nonwoven fabric webs and a wide variety of fiber-water stocks and fibers.
  • Apparatus for producing an endless nonwoven sheet from water-fiber stock comprising an endless wire screen; a continuous flat inclined suction box train engaging the underneath side of a portion of the screen and forming it into a flat inclined portion; the train having a plurality of suction boxes, each extending transversely across and underneath the screen and being positioned contiguously one after another upwardly along its length, each box being connected to a separately adjustable vacuum source; a stock tank having an opening at one end adjacent the inclined portion of the screen for supplying water-fiber stock to the inclined portion of the screen; means for continuously moving the screen upwardly through the stock tank and along the suction box train at a predetermined speed for depositing fibers from the stock on the inclined portion of the screen as water is drawn through it in accordance with the dlfferent vacuums m the suction boxes;
  • an endless elastic belt and means positioning a portion of the belt in the stock tank a predetermined distance above the inclined screen portion, there being elements contacting but above this belt portion which form it into a predetermined curved shape adjacent the inclined-screen portion, which shape is related to and a determinant of the amount of water passing through the suction boxes to keep the velocity of flow of the stock as equal as possible to the speed of the wire along the suction box train; and means including a driven roller above the belt portion for pulling the belt upwardly in the same direction as and at the same speed as movement of the stock.
  • the belt curve determining elements comprise a plurality of rollers and the means for adjusting the position of each element comprises a linking member pivoted at one end to the belt portion position adjusting means and connected at its opposite end to the axis of its roller; and means for pivoting the link about its pivot point for raising and lowering the roller attached to it.

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US840940A 1968-07-15 1969-07-11 Wet process apparatus for making nonwoven fabrics Expired - Lifetime US3642573A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19681761855 DE1761855A1 (de) 1968-07-15 1968-07-15 Vorrichtung zum Herstellen von Flaechengebilden

Publications (1)

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US3642573A true US3642573A (en) 1972-02-15

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Application Number Title Priority Date Filing Date
US840940A Expired - Lifetime US3642573A (en) 1968-07-15 1969-07-11 Wet process apparatus for making nonwoven fabrics

Country Status (5)

Country Link
US (1) US3642573A (de)
AT (1) AT305013B (de)
DE (1) DE1761855A1 (de)
FR (1) FR2012990A1 (de)
GB (1) GB1281833A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935061A (en) * 1972-12-11 1976-01-27 Escher Wyss Gmbh Stock inlet for a paper machine
US4158596A (en) * 1977-06-08 1979-06-19 Beloit Corporation Traveling wire web former
US20130269898A1 (en) * 2010-12-17 2013-10-17 Oji Holdings Corporation Device for producing fibrous sheet

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595894A (en) * 1925-07-03 1926-08-10 Frederic P Klund Machine for thickening pulp
US2473270A (en) * 1944-09-02 1949-06-14 Rice Barton Corp Cylinder mold papermaking machine
US2753766A (en) * 1951-12-29 1956-07-10 Forming Machine Company Of Ame Positive pressure machine for forming continuous strips of fibrous materials
US2890149A (en) * 1949-10-31 1959-06-09 J M Voith G M B H Maschinenfab Method and apparatus for making paper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1595894A (en) * 1925-07-03 1926-08-10 Frederic P Klund Machine for thickening pulp
US2473270A (en) * 1944-09-02 1949-06-14 Rice Barton Corp Cylinder mold papermaking machine
US2890149A (en) * 1949-10-31 1959-06-09 J M Voith G M B H Maschinenfab Method and apparatus for making paper
US2753766A (en) * 1951-12-29 1956-07-10 Forming Machine Company Of Ame Positive pressure machine for forming continuous strips of fibrous materials

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935061A (en) * 1972-12-11 1976-01-27 Escher Wyss Gmbh Stock inlet for a paper machine
US4158596A (en) * 1977-06-08 1979-06-19 Beloit Corporation Traveling wire web former
US20130269898A1 (en) * 2010-12-17 2013-10-17 Oji Holdings Corporation Device for producing fibrous sheet
US8845862B2 (en) * 2010-12-17 2014-09-30 Oji Holdings Corporation Device for producing fibrous sheet

Also Published As

Publication number Publication date
AT305013B (de) 1973-02-12
GB1281833A (en) 1972-07-19
DE1761855A1 (de) 1971-09-02
FR2012990A1 (de) 1970-03-27

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