ES2301829T3 - A SYSTEM FOR SEPARATING MATERIAL TRANSPORTED BY FLUID FROM A FLUID THAT CARRYS PARTICULATED MATTER TOGETHER WITH THE MATERIAL. - Google Patents

Abstract

A system for screening fluid-borne material from a fluid that carries particulate matter along with the material, e.g. for screening usable fibers in papermaking or tissue making white water that also contains waste material such as fines and ash. The system employs a flexible and pliable screen to which the fluid is applied. The screen is supported in a suspended manner from a frame. The fluid is directed onto an inside surface defined by the screen, and the location at which the fluid strikes the screen is varied so as to result in bending and flexing of the screen due to the flexibility and pliability of the screen material. In this manner, the configuration of the screen drainage passages is continuously altered, to provide a self-cleaning action that prevents the screen passages from plugging or blinding over. In one form, the screen is generally frustoconical, and the fluid is applied to the inside surface of the screen in a manner which results in rotation of the screen. The material retained on the screen is directed toward a discharge opening defined by the lower end of the frustoconical screen, and the waste water including the particulate matter passes through the screen and is collected in a waste water collection tank. In another form, the screen is suspended from a frame to form a trough configuration having an open discharge end. The frame is movable in either an axial direction or a transverse direction, to cause movement of the screen and to obtain the desired flexing and bending of the screen to self-clean the screen drainage passages.

Description

A system to separate transported material by fluid from a fluid that carries particulate matter along with the material.

This invention relates to a process for make products such as paper or tissue from pulp or other material containing fiber, and more specifically to a process for recover and recycle usable fibers contained in water produced in said process.

The manufacture of products such as paper and tissue uses fibrous material such as wood pulp, which is processed in a known way to produce the final product wanted. In a paper or tissue manufacturing process, it is applied the pulp to a sieve or tissue to make paper from a top box, and water is expelled from the pulp in a known manner to form the paper or tissue, which dries and is shaped like a roll. Water which is expelled from the pulp is commonly known as white water, and typically includes small particles of fines and material of ash that pass through the tissue along with the water. In addition, the white water inevitably includes a quantity of fibers Usable that pass through or around the tissue to make paper, which is wasted if white water is discarded. This is a known problem in the tissue industry, and has given place to the development of systems that recirculate the white water of new to the pulp supply system, to recirculate the fibers Usable However, such systems also recirculate the Fine and ash material. This is acceptable in a process of make paper, in which the fines and ash material can be incorporated into the paper. However, the presence of such material is very harmful in a tissue manufacturing process, because the Small particles of material inhibit drainage. Consequently, simple recirculation systems are undesirable in a tissue manufacturing process, since the undesirable fines and ash are simply recirculated Continue in the process. Some systems of sieve, which employ a stationary sieve, in an effort to separate usable fibers of fines and ash. Typically, the fibers retained in the sieve are cut intermittently from the sieve and recirculate in the pulp supply system. Since such systems necessarily use sieves with small holes, there are a significant tendency for sieve holes to plug or "blind" due to the accumulation of material in the holes Consequently, many known systems do not work properly for this reason, or require a lot of maintenance to keep sieve holes unobstructed.

DE-A-2924794, in which is based on the precharacterizing clause of claim 1, describes a system for separating material transported by fluid of a fluid that carries particulate matter along with the material, including: a sieve arrangement including a support and a sieve, with drainage steps, where the sieve defines an interior and an outlet, a fluid supply device configured to direct the fluid out from inside the sieve on the inner surface of the sieve, where the fluid collides in the inner surface of the sieve in one or more shock positions, where the drainage steps are sized to retain the material on an inner surface defined by the sieve and for allow particulate matter to pass through the steps of sewer system; and means interconnected with the support to impart motion to the sieve, where the motion of the sieve varies the one or more crash positions while the fluid is directed out on the inner surface of the sieve by the device fluid supply

Another fiber recovery system that uses a flexible sieve described in US-A-4477359.

An object of the present invention is provide an effective system to recover usable fibers of white water in a paper making system, in order to allow that usable fibers are recirculated to the system without recirculating undesirable undesirable material such as fine and ash commonly found in white water papermaking. Other object of the invention is to provide a system that involves little modification of an existing circulation system to make paper, while allowing fiber recovery usable white water and recirculating usable fibers for use. Another object of the invention is to provide a system that requires little maintenance and that is relatively simple in its components, construction and operation, to allow the system be installed and operated at a relatively low cost with in order to justify the recovery and recirculation of fibers Usable white water. Another object of the invention is replace existing ineffective recovery systems with a  recovery system that provides a supply of material clean tissue in formation to allow more operation Efficient system.

According to a first aspect of the present invention a system for separating material transported by fluid from a fluid that carries particulate matter along with the material, including: a sieve arrangement including a support and a sieve, with drainage steps, where the sieve defines a interior and an outlet, a fluid supply device configured to direct the fluid out of the interior of the sieve on the inner surface of the sieve, where the fluid collides on the inner surface of the sieve in one or more positions of shock, where the drain steps are sized to retain the material on an inner surface defined by the sieve and for allow particulate matter to pass through the steps of sewer system; and means interconnected with the support to impart motion to the sieve, where the motion of the sieve varies the one or more shock positions while the fluid is directed towards outside on the inner surface of the sieve by the device fluid supply; characterized in that the sieve is suspended of the support, is formed by a flexible sieve material and folding formed of a series of interwoven threads that define the drainage steps; and is set to deviate out on the one or more shock positions, where deflection out from the sieve to the sieve movement through the one or more positions of shock serves to vary the configuration of the drainage steps to dislodge all particulate matter located within the steps drainage, and where the pressure applied by the device fluid supply in the one or more shock positions serves to push the particulate matter located within the steps of drainage through the drainage steps in order to avoid accumulation of particulate matter within the steps of sewer system.

The present invention further provides a method of separating material transported by fluid from a fluid that carries particulate matter along with the material, including Steps of: directing the fluid on a sieve surface flexible, where the screen defines drainage steps sized for retain the material on the sieve surface and where the steps of drainage allow fluid and particulate matter contained within of the fluid pass through the sieve, where the sieve is supported by a support arrangement that is configured to provide deflection out of the sieve where the fluid is directed over the sieve surface; and produce the sieve movement by directing at the same time the fluid on the sieve surface in order of varying the position in which the fluid is directed on the sieve surface, where the motion of the sieve combined with deflection out of the sieve can alter the configuration of  the sieve drain steps to dislodge particulate matter contained within the drainage steps, where the pressure applied to the surface of the sieve by the fluid can push matter particulate contained within the drainage steps through the drainage steps in order to avoid the accumulation of matter particulate within the sieve steps.

According to the present invention, a system of fiber recovery for a tissue manufacturing process or paper uses a filter or sieve, on which the white water of the process is directed in a downward position of a container of White water collection that is part of the manufacturing system of paper. The sieve is sized in order to allow water containing the undesirable or unusable components of the white water, such as fine and ash, pass through the sieve while retaining usable fibers in the sieve. Water containing undesirable or unusable material is directed to a wastewater treatment facility, so conventional, and the cleaned water can be supplied again later to the system. The sieve, on which the water is directed white, it is formed of a flexible and foldable sieve material, which can be of the same type of material as the commonly used as the tissue in a tissue or paper manufacturing system. He sieve is supported in such a way that the sieve is maintained relatively loose and flexible, for example by suspending the sieve of a rack. The sieve is subjected to movement when the water white is directed on the sieve, which results in the flexion of the sieve material, to carry out a self-cleaning action of the sieve that prevents the sealing and blinding of the sieve holes. The invention contemplates several different arrangements for withstand and impart movement to the sieve, and to direct the water White on the sieve. In all versions, white water is applied to an interior area defined by the sieve, and the fibers Usable are collected on the inner surface of the sieve. He sieve is configured to direct the usable fibers to a open discharge area, where the usable fibers are unloaded from the sieve. Usable fibers are returned then to the system and incorporated into the fibrous material supplied to the upper case, for subsequent application to the tissue of paper making

Other various features, objects and advantages of the invention will be apparent from the following description taken Together with the drawings.

For the understanding of the invention, it is now describe some of its embodiments, given by way of example, referring to the accompanying drawings, in which:

Figure 1 is a side elevation view, partially in section, which represents an embodiment of a fiber recovery system according to the present invention.

Figure 2 is a partial section view taken along line 2-2 of figure 1, which represents the sieve at rest.

Figure 3 is a view similar to Figure 2, which represents the operation of the system and the rotational movement of the sieve.

Figures 4 and 5 are views similar to the Figure 3, which represent alternative arrangements for directing White water on the sieve.

Figure 6 is a view similar to Figure 1, which represents an alternative embodiment of the system of fiber recovery of the present invention.

Figure 7 is a sectional view taken at along line 7-7 in figure 6.

Figure 8 is a partial elevation view side of the lower end of the sieve incorporated in the system fiber recovery illustrated in Figure 6, with reference to the line 8-8 of figure 6.

Figure 9 is a partial section view enlarged illustrating an alternative provision of supply of white water for the fiber recovery system illustrated in the figure 6.

Figure 9A is a view similar to Figure 6, which represents another alternative embodiment of the system of fiber recovery of the present invention, which incorporates the white water supply arrangement as illustrated in the figure 9.

Figure 10 is an isometric view illustrating another embodiment of a fiber recovery system according to the present invention

Figure 11 is a sectional view taken at along line 11-11 of figure 10.

Figures 12A and 12B are views similar to the Figure 11, which represent the sieve subjected to movement for clean the sieve and to unload fibers collected from the area of Sieve discharge.

Figure 13 is a sectional view taken at along line 13-13 of figure 11, which represents an embodiment to direct the white water over the sieve.

Figures 14-18 are views similar to figure 13, which represent alternative embodiments to direct the white water over the sieve and to impart Sieve movement.

Figures 19 and 20 are partial views in side elevation illustrating two different discharge arrangements  for a sieve configured as shown in figure 11.

Figure 21 is a view illustrating the area of discharge of the supply duct that directs the white water over the sieve in one embodiment as illustrated in Figure 10.

Figure 22 is a view similar to Figure 21, which represents a flow deflector in the duct discharge of supply.

Figure 23 is a sectional view taken at along line 23-23 in figure 22.

Figures 24A and 24B are views similar to the Figure 21, which represent alternative provisions in the discharge of the supply duct to alter the path of the White water when directed towards the sieve.

Figures 25-27 are views that illustrate different hole configurations for a conduit of supply, for use when directing the white water on the sieve.

Figure 28 is a schematic representation of a papermaking process that incorporates the system of fiber recovery of the present invention.

Figure 29 is an elevation view of the material of sieve used to form the sieve incorporated into the system of fiber recovery of the present invention.

Figure 30 is a cross-sectional view. of the sieve material shown in Figure 29.

Figure 31 is a view similar to Figure 30, which represents the sieve material in a configuration deformed or arched such as the one that takes place when heading White water on the sieve in operation.

Figure 32 is an enlarged sectional view. cross section of a portion of the sieve material as illustrated in Figure 30

And Figure 33 is an enlarged sectional view. cross section of a portion of the sieve material as illustrated in Figure 31

Detailed description of the invention

Figures 1-3 illustrate a first realization of a fiber recovery system, generally represented in 30, according to the present invention, that It is especially suitable for use in a manufacturing process of tissue In general, the fiber recovery system 30 includes a screen 32 suspended from a frame 34 and configured to define a discharge hole 36, in combination with a system of desired water supply 38 that can operate to direct water white of a system of making paper on a sieve surface 32. Fiber recovery system 30 also includes a fiber collection tank or container open upwards 40 located under the discharge hole 36 of the screen 32, and a wastewater collection tank or container open to up 42.

Screen 32 is made of a screen material flexible and foldable, and is frustoconic. The material of sieve 32 may be the same type as that used as the tissue in a tissue manufacturing process. Representatively, the sieve material 32 is a sieve material such as that which is you can get from Albany International, Appleton, Wire Division, Appleton, Wisconsin under model number M-Weave, Duraform, Z-76, which is a sieve material of five-layer tissue manufacturing that has a thread count  3.3 / mm (84 / inch) (DM), 3.3 / mm (78 / inch) (DT), a permeability of 730 CFM and a caliber of 0.41 mm (0.016 inches). It is understood that this type of sieve material is representative of various types of sieve material that can be used, depending of the size of the fibers to be collected as well as several other parameters operational For example, the size of the cord, the count and the Screen configuration of the sieve material may vary with regarding the illustrated embodiment. The function of flexibility and sieve folding 32 will be explained later.

The upper end of sieve 32 is fixed to the frame 34, so that screen 32 is suspended from the frame 34. The frame 34 includes a peripheral frame element exterior 44, which is generally circular, and to which the upper end of the screen 32. The frame 34 further includes a series of radial radii 46 extending between the element outer frame 44 and a hub 48. A mounting element 50 is  fixed to any satisfactory upper support element 52, and includes a rotating shaft 54 to which hub 48 is connected. Of this Thus, the frame 34 and the screen 32 are rotatable around a longitudinal axis of rotation defined by the longitudinal axis of the sieve 32, which is coincident with the longitudinal axis of axis 54.

Screen 32 is configured so that its sides are oriented at an angle of approximately 30º of the vertical, in order to define an included angle of approximately 60º. Representatively, screen 32 defines a upper diameter of approximately 48 inches (121.9 cm), where the screen 32 is connected to the outer frame element 44, and the discharge hole 36 has a diameter of approximately 7 inches (17.78 cm). The height of sieve 32 is approximately 41 inches (104.14 cm). It is considered that these dimensions provide enough production to accommodate the amount of water white generated in most training applications tissue It is understood that these dimensions and angles are indicated by in order to illustrate an embodiment of screen 32 and frame 34 which is considered to provide satisfactory results, and that you can also find other dimensions and angles that work satisfactorily. For example, the size of sieve 32 can be increase to accommodate a greater volume of white water than can generate in tissue manufacturing operation in greater volume.

The white water supply system 38 can operate to direct white water from a papermaking process on the inner surface of the screen 32. As shown in Figures 1-3, the white water supply system 38 is in the form of a series of upwardly extending ducts 58, which are centered on a longitudinal axis coinciding with the longitudinal axis of the screen 32. Each conduit 58 is provided with a series of spaced holes 60 along its length, and is closed in its upper end Representatively, each conduit 58 has an inner diameter of 76 mm (3.0 inches), although it is understood that any other satisfactory conduit size can be employed. The ducts 58 extend through supports 62, which serve to maintain the position of the ducts 58 relative to each other. The holes 60 in each conduit 58 are arranged linearly. The line of holes 60 in each conduit 58 is oriented radially so that it faces in a direction perpendicular to the front direction of the line of holes 60 in the adjacent conduit 58. As shown in Figure 2, each line of holes 60 is oriented so that it looks in a direction parallel to and laterally deflected from a sieve radius 32. In this way, each line of holes 60 serves to direct white water on the inner surface of the sieve 32 in a direction generally indicated by an arrow 64 ( Figure 2), so that the white water that hits the inner surface of the sieve 32 applies a radial force and a tangential force to the inner surface of the sieve 32. Representatively, each hole 60 is circular in shape, and has a diameter of approximately 9.5 mm (0.375 inches) although it is understood that any other shape and dimension can be used
cross.

The ducts 58 extend through a bottom wall 68 defined by the fiber collection tank 40, and through a bottom wall 70 defined by the reservoir of wastewater collection 42. Holes have formed in the bottom walls of reservoir 68 and 70 to accommodate the passage of ducts 58 therethrough, and seals are disposed at appropriate fluids between ducts 58 and lower walls from reservoir 68, 70. Alternatively, ducts 58 can be steer outwardly between discharge hole 36 and the fiber collection tank 40, to avoid difficulties and maintenance associated with sealing between ducts 58 and the walls 68, 70.

In operation, the recovery system of fiber 30 works as follows to recover usable fibers from white water-making paper, which is supplied through the ducts 58. White water is directed towards the surfaces interiors of sieve 32 passing through holes 60 of the ducts 58. Each line of holes 60 forms a series of linear streams of white water discharge, so that water white is applied to the inner surfaces of sieve 32 usually in a configuration represented in 72. The component tangential of the force with which each discharge of white water collides on the inner surface of sieve 32 serves to impart rotation to sieve 32 around its longitudinal axis, by the shaft rotation 54 relative to mounting element 50. The rotation speed of sieve 32 depends on the amount of force applied for each discharge of white water, which is proportional to the white water pressure in ducts 58, as well as the angle of White water discharge streams. Representatively, it has been found that a satisfactory operation is achieved by maintaining a low pressure (for example, 5 psi) in the ducts 58 which serves to apply a force to sieve 32 which causes sieve 32 turn at a speed of approximately 40 rpm.

Screen holes 32 are sized to retain usable fibers on the inner surface of the sieve 32, and to let the water and waste material contained within of white water, such as fine and ash, pass through the sieve holes 32. Waste water passes through sieve 32 to outside of screen 32, and falls by gravity to the collection tank of wastewater 42. Wastewater can also be lowered by external surfaces of sieve 32. If desired, a shirt at the lower end of sieve 32 in order to direct the waste water out to waste water collection tank 42. The wastewater is then directed through an outlet of wastewater 74 from the wastewater collection tank 42 to a wastewater treatment system, where solids are removed and the cleaned water can be recirculated to the manufacturing process paper.

Usable fibers contained within the wastewater, which is retained on the inner surface of the sieve 32, go down the inner surface of the sieve 32 towards the hole discharge 36, by gravity. The layer of usable fibers collected on the inner surface of the screen 32 is illustrated in representative at 76. When the usable fiber layer 76 advances downward on the inner surface of sieve 32, the centrifugal forces due to the rotation of sieve 32 serve to expel water and additional waste material through the sieve holes 32 when the usable fibers move towards the discharge hole 36. In this way, the usable fibers that are discharged through the discharge hole 36 are of a relatively thick coherence, from which the greatest has been expelled part of the wastewater. Usable fibers are collected in the fiber collection tank 40, and are directed through a fiber discharge outlet 78 from collection tank 40 to a pump, which recirculates the usable fibers to the manufacturing process paper. Alternatively, the fiber recovery system 30 is can be installed above the level of the tank, so that it is used gravity flow instead of a pumping operation to recirculate usable fibers.

White water can be applied to screen 32 of several other forms, and examples are illustrated in Figures 4 and 5. As shown in Figure 4, two ducts of supply 58 to apply white water to sieve 32 instead of the four ducts 58 as illustrated in figures 2 and 3. Of again, the holes 60 in ducts 58 are arranged so that are deviated in relation to the center of screen 32 and with in relation to the radii of sieve 32, to apply the discharges to the sieve 32 with a tangential force to impart rotation to the sieve 32. Figure 5 illustrates another embodiment, in which white water It is supplied through a single duct 80, with a series of elbows 82 that provide the radial deviation of the discharge to apply a tangential force to sieve 32 in order to impart screen rotation 32.

Although Figures 1-5 illustrate a certain embodiment of the invention, it is understood that they are possible variations of this version and are included in of the scope of the present invention. For example, and without limitation, it is contemplated that the rotation of the screen 32 can be perform using an engine, to ensure that screen 32 rotates to a desired speed In a version such as this, the downloads of white water are preferably applied to the sieve so radial, to eliminate the tangential component of the force  applied by the download. In addition, although sieve 32 has been illustrated with a straight-sided frustoconic configuration, it is also considered that the sides of sieve 32 may have a convex or concave configuration, if desired. White water It can also be applied to the inner surface of the sieve in any position and in any way, and it is understood that illustrated embodiments are simply representative of several ways by which white water can be applied. Although drawings illustrate the use of four discharges to apply water white to the sieve, it is understood that any number can be used and Desired download size.

The flexibility of sieve 32 allows the sieve 32 deforms in its normal way during operation when white water is directed on sieve 32 and collides with it. How I know represents in figure 3, the four discharges applied to the sieve 32 serve to divert the portions of the sieve out where white water discharges apply, to provide areas generally convex arched sides between deformed areas  out. This flexibility and folding of the sieve material performs a "self-cleaning" action of the sieve, in which the individual strands of the sieve material are flexed and curved to avoid the accumulation of material in the corners of the holes sieve, which can lead to plugging of the holes in sieve and "blinded" sieve. The fiber recovery system 30 thus requires very little maintenance, providing the same time an extremely effective and efficient system to collect fibers Usable and separate unusable material.

Figures 6-8 illustrate a alternative embodiment of a fiber recovery system, generally represented in 30 ', which is similar in general to fiber recovery system 30 illustrated and described previously. Similar reference characters will be used where possible to facilitate clarity.

In the 30 'fiber recovery system, the sieve 32 is suspended from frame 34 and has the same general configuration than previously described. In the system of 30 'fiber recovery, the white water supply system, generally represented in 38 ', differs somewhat from the system of white water supply 38 in which each duct 58 'includes a lower section located under the support 62, and a section upper 83 tilted out relative to section lower. The upper sections 83 of the ducts 58 'diverge in the upward direction, and each upper section 83 is oriented substantially parallel to sieve side 32 so that the streams of white water discharged from holes 60 are applied in a direction substantially perpendicular to screen 32. This orientation of upper sections 83 of the ducts serves to provide a more efficient and direct application of white water to the inner surface of the screen 32. Alternatively, the water white can be applied to the inner surface of sieve 32 in a  non-perpendicular orientation, so that the white water flow include a force component parallel to the screen plane 32 when white water hits the surface of sieve 32. In case that the white water is applied to the surface of the screen 32 with in order to include a force component parallel to the plane of sieve 32, that is in a non-perpendicular form, the component of parallel force of white water tends to deform the channels of draining screen material 32 from a configuration generally square or rectangular to a diamond-shaped configuration. This deformation of the sieve drainage channels 32 also contributes to carry out the self-cleaning action of sieve 32 avoiding the accumulation of material in the corner regions of the drainage channels.

With reference to figure 7, each section upper duct 83 has two lines of holes 60. One of the hole lines 60 is oriented in order to apply a line of white water streams S_ {1} that is heading out into a radial direction relative to the center of screen 32. Each upper duct section 83 further includes an additional line of holes 60 that slopes relative to the line of holes 60 looking radially. The second line of holes is placed with in order to emit a series of currents S_ {2}. Each stream S_ {2} is oriented at an angle of approximately 45º in relation to to currents S_ {1}, and each current S_ {2} collides in the inner surface of sieve 32 in order to apply a force which has a radial component and another tangential to the surface inside the screen 32. The currents S_ {2} thus serve to impart rotation to sieve 32 due to the presence of the component of tangential force. In addition, the emission of two streams separated from each upper section of duct 83 serves to apply  white water for a significant portion of the surface inside of screen 32, in order to maximize the surface area from sieve 32 to which white water is applied.

As depicted in Figures 6 and 8, a lower section 85 is fixed to the lower end of the screen 32 in discharge hole 36. The lower section 85 is fixed to the sieve 32 via a skirt 87. The lower section 85 serves to increase the overall surface area of the sieve, and direct the material fiber usable inward to an outlet 89 at its end lower, surrounding the ducts 58 '. At exit 89, the section lower 85 may include a series of fins 91 separated by slits 93. Usable fibers are discharged to the reservoir of fiber collection 38 through slits 93. In operation, the fibers are collected on the inside surface of the section lower 85, and skirt 87 serves to direct wastewater out beyond the collection deposit walls of fibers 40, in order to prevent residual water from falling into the tank fiber collection 40.

Figure 9 illustrates an alternative system of 38 "white water supply, which includes duct sections inclined upper 83 as shown in figures 6 and 7. In this embodiment, the 38 "white water supply system includes a single supply duct 95 that extends towards up to the bottom of sieve 32, and supplies white water to a manifold 97 fixed to the upper end of the duct 95. In turn,  the inclined upper duct sections 83 are connected to collector 97, and they receive white water from collector 97 to application through holes 60 to the inner surface of the sieve 32 in the manner previously described. In this embodiment, it you need a single tube to supply white water to the system recovery as opposed to the multiple tubes illustrated in the previous embodiments. With this construction, the section of funnel 85 may be sized such that its discharge 89 conforms relatively narrowly to the surface outside of duct 95, to provide additional control of the discharge of usable fibers from funnel section 85.

Figure 9A illustrates a complete cross-sectional view of the white water supply system 38 'shown in Figure 9, and also illustrates an alternative system for supporting screen 32. In the embodiment illustrated in Figure 9A, a vertical support in The shape of a mast 99 is located inside the screen 32 to rotatably support the screen 32 below rather than above as illustrated in Figures 1 and 6. The mast 99 defines a lower end that is mounted on a surface that looks upwardly defined by the manifold 97, so that the screen 32 is supported from the manifold 97. A hub 101 is rotatably mounted on the upper end of the mast 99, and the frame 34 is interconnected with the hub 101 by radii or Any other satisfactory way. With this construction, the fiber recovery system of the present invention is a generally autonomous system that does not require external support, to allow the system to be produced outside and subsequently installed on site by simply making the appropriate tube connections with the tube white water, wastewater and fiber recovery of the tissue or paper manufacturing facility.

Figures 10, 11, 12A and 12B illustrate a alternative fiber recovery system according to the present invention, generally represented in 84. In this embodiment, a sieve 86 is suspended from a frame 88 having an end of open discharge 90. A white water supply conduit 92 directs white water from papermaking on sieve 86. A fiber collection tank 94 is located below the end of 90 discharge from sieve 86, and a water collection tank residual 96 is located below the rest of the sieve length 86.

The frame 88 is generally rectangular in plant, and includes a pair of end frame elements 98 and a pair of side frame elements 100. Screen 86 is made of the same type of material as screen 32. Screen 86 has a channel or channel configuration, which defines a closed end 102, and a pair of inclined side walls 104 that converge on a channel bottom 106. Screen 86 is oriented such that the bottom of channel 106 bends down in one direction towards the discharge end 90.

The white water supply duct 92 defines an outlet 108 that directs white water on the surface inside the screen 86 in the direction of an arrow represented in 110. Exit 108 of conduit 92 is located towards the end of discharge from sieve 86, and the white water pressure inside the conduit 92 is such that, after discharge by exit 108, white water crashes into the inner surfaces of sieve 86 in its side wall 104 in close proximity to the closed end 102, and deviate over the closed end 102 and the bottom 106.

The frame 88 is supported in a manner that It allows frame 88 and screen 86 to be mobile. In the illustrated embodiment, the frame 88 is supported by way of supension using cables 112 and rings 114, which, in turn, are connected to suitable upper supports 116. As shown in figures 12A and 12B, frame 88 and screen 86 are adapted to move in a longitudinal axial direction of a side to side, while white water is applied to surfaces Sieve 86 interiors through conduit 92.

In the operation, white water is applied from manufacture of tissue or paper to the inner surfaces of the sieve  86 as depicted in Figure 11, through exit 108 of conduit 92. Again, sieve holes 86 are sized to retain usable material contained within the white water on the inner surfaces of the sieve 86. Water residual, including unusable material such as fines and ash, passes through sieve 86 and is collected in the tank wastewater collection 96. Intermittently or continuously, the sieve 86 is moved axially from side to side while white water is still applied to the interior surfaces of the sieve 86. The movement from one side of sieve 86 to the other takes to perform satisfactorily, preferably automatically by the operation of a motor with an intermittent actuator, such as an actuator of the eccentric type or the like. To carry out, the frame 96 is pushed back to a position like it is represented in figure 12A, and later it can be tilted forward under its own weight, which includes the weight of the frame 88, screen 86, and the material retained in screen 86. This movement of sieve 86 performs numerous functions. First: the usable fibers, which are collected in the channel of sieve 86 at the bottom of sieve 106 and the lower zones from the side walls 104, move forward towards holes discharge 90 when sieve 86 is tilted forward as depicted in figure 12B. This causes the end portion of the collected fibers, represented in 118, pass through the discharge hole 90 for supply to the collection tank of fibers 94. Furthermore, said movement of the screen 86 causes the sieve material bends and flexes, which performs a Self-cleaning action as described above. He sieve movement also varies the position in which the water white collides on the inner surfaces of sieve 86, which of again causes the sieve material to bend and flex locally, Self cleaning the sieve.

When the usable fibers move towards the discharge hole 90, water and unwanted residual material or unusable content within white water continue to separate from the fibers and are discharged to the wastewater collection tank 96. Again, the wastewater is directed to an installation of wastewater treatment for material extraction undesirable and recirculation of the water cleaned to the system. Fibers Usable collected in the fiber collection tank 94 are recirculated back to the system through an outlet 120 associated with the fiber collection tank 94.

Figure 13 illustrates a single conduit 92 arranged to direct white water on a side wall 104 of the screen 86. As shown in Figure 14, it is also contemplated being able to arrange a pair of ducts 92 'side by side, and separate linear holes formed in the ducts 92 'in order of directing a discharge of white water on the side walls 104 of screen 86. Figure 15 illustrates the use of four ducts 92 'white water supply to direct water discharges white on the side walls 104 of the screen 86.

Figure 16 illustrates an arrangement similar to Figure 10, but incorporating a pair of frame elements lower 122 that contribute to form the fiber material collected in the lower area of sieve 86.

As depicted in Figure 17, it is also contemplates that sieve 86 can be moved in juxtaposition to perform the same functions as those set forth above. From Again, this is done by applying a lateral force to the frame 88, or imparting, continuously or intermittently, movement to the sieve 86. Such movement of screen 86 serves to wind the fibers collected at the bottom of the channel defined by sieve 86, to form a roll or bundle of fibers 122. The inclination towards below the bottom of the screen 106 serves to advance the fiber roll or package 122 towards discharge outlet 90 when sieve 86 moves in juxtaposition.

Figure 18 illustrates another arrangement alternative, in which the side walls 104 of the screen 86 are formed with extensions 124. The lateral wall extensions 124 they extend and withdraw alternately, which gives rise to alternative elongation and shortening of the side walls 104 of the sieve. In this way, the frame 88 is twisted around of its longitudinal axis while sieve 86 moves by varying the position in which white water collides in sieve 86, with the in order to flex and self-clean the screen 86, and to advance the roll or fiber pack 122 towards the discharge outlet 90 of the sieve.

Figure 19 illustrates an arrangement in which a fiber discharge duct 126 is located at the outlet of 90 discharge from screen 86. Advanced usable fibers towards the discharge outlet 90 are directed directly to the entrance of the fiber discharge duct 126, to eliminate the use of fiber collection tank 94 and redirect the fibers Usable directly to the papermaking process.

Figure 20 illustrates the use of an element of rigid frame 126 located at the discharge outlet 90 of the sieve 86. This provision serves to create a collection cavity of fibers at the lower end of sieve 86 next to the outlet of discharge 90, to form a dam on which the fiber material collected.

Figure 21 represents the conduit of white water supply 92 that has an outlet 108 through the  that the white water stream is discharged for application to interior surfaces of the screen 86. It is also contemplated that the position in which white water collides on sieve 86 can be vary by changing the position of the flow rather than by varying the sieve position In this regard, as depicted in the Figure 22, a flow baffle 130 can be mounted in the duct 92, which has a fin 132 located in the flow path of White water. Flap 132 is configured to move in response to the shock of white water on fin 132, to move the flow of white water when directed to screen 86. Figures 24A and 24B illustrate a flexible nozzle 134 mounted at the end of conduit 92. The nozzle 134 is made of such a flexible material as rubber, and serves to rise and fall in response to the emission of white water through its outlet in order to vary the position in which white water collides on the interior surfaces of the sieve 86.

Figure 25 illustrates supply lines of white water such as 58 or 92 ', which have 60 spaced holes to supply a discharge of white water on the surfaces interiors of a sieve, such as 32 or 86. Holes 60 Illustrated are circular. As depicted in Figure 26, the holes can also be in the form of straight transverse grooves 136, or, as depicted in Figure 27, V-shaped grooves 138, to provide different download configurations for Apply the white water to the sieve.

It is understood that additional and alternative variations to the system and the details illustrated in Figures 11-27 are possible. For example, and without limitation, the particular shape and configuration of the screen may vary with respect to the illustrated embodiment. The frame 88 can take any desired shape, and can be satisfactorily supported. White water can be applied to the screen using the various white water supply arrangements illustrated, or any other desired arrangement. Although the screen is represented and described as axially or transversely movable, it is understood that a combination of axial and transverse movement can also be employed. In addition, it is understood that the present invention can be employed to screen any type of fluid transported particles, and is not limited to use in an application of sieving tissue-produced white water.
paper.

Figure 28 illustrates a representative tissue or paper manufacturing system in which the fiber recovery system of the present invention, shown in 30 and 84, can be incorporated. As depicted, the fiber recovery system 30, 84 is located down the wire hole 150 and felt hole 152, which collects white water discharged through the fabric 154. The recovered fiber material is supplied to the machine reservoir 158 through an appropriate supply tube 160, which supplies the fibers recovered to the supply stream for ultimate supply to the upper case 162 of the tissue or paper making machine. It is understood that any number of fiber recovery systems such as 30, 84 can be used depending on the size of the tissue or paper manufacturing system and the volume of white water produced in the system, to recover all the usable fibers contained in the system. white water and to purge the system of small particulate material such as fines and
ash.

Figures 29-33 illustrate a representative embodiment of the material used to build sieves 32 and 86. As previously indicated, the sieve material It can be a tissue manufacturing sieve material of five layers, although it is understood that any other can be used sieve material configuration. The sieve material includes axial threads S_ {A} and transverse threads S_ {T}, which are woven jointly in a known way and cooperating in the definition of generally rectangular holes or drainage channels C that are Spread over the entire thickness of the sieve material. The material of sieve is selected so that the dimensions of the C channels let the fines and ash material contained within the white water pass through the C channels, and retain the fibers Usable contained in white water on the inner surface of the sieve material in the fiber layer 76. As depicted in Figures 31 and 33, the fiber layer 76 has been formed in the inner surface of the sieve material such that the area of the fiber layer 76 covering each channel C extends partially to channel C. This outer formation of the layer of fiber 76 in the C channels serves to fix the fiber layer 76 on The sieve material. When the sieve material zone is subjected to external pressure, such as when the material area of sieve passes through the area in which the white water discharges, the applied white water pressure serves to disturb the individual fibers of the fiber layer 76 as well as the anchorage of the fiber layer 76 on the sieve material, which allows fiber layer 76 to descend into the material of sieve towards the sieve discharge zone. Simultaneously, the outward pressure applied to the sieve material serves to deflect or deform the sieve material outward, as has been previously indicated, to increase the degree of curvature of the sieve material Such deflection or deformation out of the sieve material produces the flexural action of the sieve as it has been indicated above, which creates an alteration in the form of drainage channels C. This results in the self-cleaning function of the sieve material, in which the alteration of the shape of the drainage channels C prevents accumulation of fines and material from ash in the corners of the drainage channels C. Figures 32 and 33 illustrate this action. As depicted in Figure 32, P particles of fines and ash material tend to remain trapped between the strands of the sieve material when the material sieve is in a flat or slightly curved configuration, such as between areas where white water discharges are applied inside the sieve material. When downloads are applied of white water to the sieve material, the sieve material deviates out to increase the curvature of the sieve material and simultaneously submit the inner surface of the material of sieve and fiber layer 76 at the applied discharge pressure. Such deflection out of the sieve material alters the thread surfaces that define the drainage channels C releasing the P particles that may be trapped inside a drain channel C between adjacent wires. As depicted in Figures 32 and 33, the strands of the sieve material are separated normally by a designated space A. When the sieve material it flexes, the inner threads join slightly to a spacing represented in A-, and the outer wires are separated slightly at a spacing represented in A +. Such approach and separation of the threads serves to dislodge particles from the corners of drainage channels C, and evicted particles undergo the pressure of the white water discharge or the pressure applied by the discharge to the fibers incorporated into the layer of fiber 76, to push the evicted particles out to discharge through drainage channels C. This action prevents particles such as P accumulate between the threads, in order to avoid the sealing of the drainage channels C and thus eliminating the downtime and extra equipment needed to clean the equipment sieving as required by the prior art.

After the sieve material passes through the outward deflection position, such as that produced by the application of white water discharges to the interior surface of the sieve, the sieve with the fiber layer 76 applied to the Inner surface assumes a flat or less curved configuration. Fiber layer 76 tends to retain the largest curvature due to to the interlocking of the fibers at the time the layer of fiber, so that the flattening of the sieve material serves well to dislodge the fiber layer 76 from the sieve material. This way, fiber layer 76 is able to move by gravity with relation to the inner surface of the sieve material towards the Sieve discharge zone when the sieve material is located between download application zones.

If necessary, the sieve can be submitted occasionally backwash if desired, for example by application of air or water to the outside of the sieve, in order to Clean the sieve if necessary.

Claims (19)

1. A system to separate transported material by fluid from a fluid that carries particulate matter along with the material, including: a sieve arrangement including a support (34) and a sieve (32), with drainage passages, where the sieve (32) define an interior and an exit (36), a fluid supply device (38) configured to direct the fluid out from the inside of the sieve (32) on the inner surface of the sieve (32), where the fluid collides on the inner surface of the sieve (32) in one or more crash positions, where the drain steps are sized to retain the material on an inner surface defined by the sieve (32) and to allow particulate matter to pass through of the drainage steps; Y means interconnected with the support (34) for impart movement to the sieve (32), where the sieve movement (32) the one or more shock positions vary while the fluid it is directed outward on the inner surface of the sieve (32) by the fluid supply device (38); characterized in that the sieve is suspended from the support (34), is made of a flexible and foldable sieve material formed from a series of interwoven threads that define the drainage steps; and is set to deviate outward in the one or more crash positions, where deflection out of the sieve (32) at passing the sieve through one or more shock positions serves to vary the configuration of the drainage steps to dislodge any particulate matter located within the drainage steps, and where the pressure applied by the fluid supply device (38) in the one or more positions of shock serves to push the matter particulate located within the drainage steps through the drainage steps in order to avoid the accumulation of matter particulate within the drainage steps. 2. A system of claim 1, wherein the support includes a rack arrangement (34), where the frame arrangement (34) is interconnected with one end upper defined by the sieve (32) and where the sieve (32) defines a lower area located below the frame arrangement that It is not supported. 3. A system of claim 2, wherein the sieve (32) defines a conical configuration that has an end upper connected to the frame arrangement (34) and one end bottom (36) that defines the output, and where the means for imparting motion to the screen (32) includes means (50) for rotating the frame arrangement around a rotation axis generally vertical coinciding with a defined longitudinal axis by sieve (32). 4. A system of claim 3, wherein the fluid supply device includes an arrangement of ducts (38) located inside the interior defined by the sieve (32), where the duct arrangement includes a series of holes through which the fluid is applied to the surface inside the sieve. 5. A system of claim 4, wherein the holes in the duct arrangement are configured and arranged to apply to the inner surface of the sieve (32) a force that tends to impart rotation to the sieve (32) around the rotation axis of the frame arrangement. 6. A system of claim 2, wherein the frame arrangement (88) and sieve (86) are configured as such that the sieve (86) is suspended from the frame (88) and define an open up channel that has an open end which defines the output of the sieve (86). 7. A system of claim 6, wherein the means for imparting movement to the screen (86) include means for vary the position in which the fluid is directed on the sieve (86). 8. A system of claim 7, wherein the means for imparting movement to the screen (86) include means for move the frame arrangement (88) in order to impart movement to the sieve (86) when the fluid is directed on the sieve surface (86). 9. A system of claim 8, wherein the means for imparting movement to the sieve (86) can operate to move the sieve (86) in a transverse direction to an axis longitudinal defined by the channel, where the transverse movement of the sieve (86) can operate to roll the material in the channel, or to move the sieve (86) in an axial direction along the axis longitudinal defined by the channel. 10. A system of claim 9, wherein the frame arrangement (88) and sieve (86) are configured as such that the channel defines an inclined lower surface down (106) leading to the exit, to contribute to redirect the material towards the exit to the sieve movement (86). 11. A method of separating transported material by fluid from a fluid that carries particulate matter along with the material, including the steps of: direct the fluid on a surface of a flexible sieve (32), where the sieve (32) defines drainage steps sized to retain the material on the sieve surface (32) and where the drainage steps allow fluid and matter particulate contained within the fluid pass through the sieve (32), where the sieve is supported by a support arrangement (34) which is configured to provide outward deflection of the sieve (32) where the fluid is directed on the surface of the sieve (32); Y produce the sieve movement (32) by directing at the same time the fluid on the surface of the sieve (32) with the in order to vary the position in which the fluid is directed on the sieve surface (32), where the sieve movement (32) combined with deflection out of the sieve (32) can operate to alter the configuration of the sieve drain steps (32) to dislodge particulate matter contained within drainage steps, where the pressure applied to the surface of the sieve (32) by the fluid can operate to push matter particulate contained within the drainage steps through the drainage steps to prevent the accumulation of particulate matter within the sieve steps. 12. A method of claim 11, also including the step of collecting material from an area of discharge defined by the sieve (32). 13. A method of claim 11, wherein the step of producing the motion of the flexible sieve (32) is carried to out varying the position in which the papermaking fluid is directed on the sieve surface (32). 14. A method of claim 13, wherein the step of producing the motion of the flexible sieve (32) is carried to end imparting movement to the sieve through a provision of frame (34) from which the sieve (32) is suspended. 15. A method of claim 14, wherein the sieve is configured to define a conical shape that has a open bottom end (36) defining the discharge zone of the sieve (32) and where the frame arrangement (34) is located in an upper end defined by the sieve (32), and where the passage of directing the fluid on the sieve surface (32) leads to out by directing the fluid outward towards an inner surface defined by the sieve (32) of a position within an interior defined by the sieve (32). 16. A method of claim 15, wherein the step of imparting movement to the sieve is carried out by turning the frame arrangement (34) while the fluid is directed on the inner surface of the sieve (32). 17. A method of claim 16, wherein the step of imparting rotation to the sieve (32) is carried out by directing the fluid tangentially against the inner surface of the sieve (32) 18. A method of claim 14, wherein the sieve (86) is suspended from the frame arrangement (88) and where the sieve (86) and the frame arrangement (88) are configured in such a way that the sieve (86) defines a channel configuration that has an open end that defines the Sieve discharge zone (86), and where the step of directing the fluid on the sieve surface (86) is carried out by applying the fluid to lateral areas defined by the channel configuration of the sieve (86). 19. A method of claim 18, also including the step of orienting the sieve (86) so that the screen channel (86) define a bottom wall tilted down (106) leading to the open end of the sieve (86), to assist and direct the material to the discharge zone of the sieve (86).