Distributing a disintegrated material onto a layer forming surface
Abstract
A method and an apparatus for distributing loose fibres or particles onto a moving web in an even layer thereon preparatory to production of a non-woven sheet of the fibre or particle material. The material is filled into a container having a generally V-shaped screen bottom extending crosswise over the moving web, and whipping members are rotated in the bottom space so as to whip the material adjacent the interior surface of the screen by a whipping movement causing the fibres or particles to be slung against the screen and the material to move in a flow lengthwise along the bottom surfaces, whereby when suction is applied to the outside of the screen bottom through the web the fibres or particles will get dispensed through the screen and deposited on the web. The combined whipping and slinging of the material contributes to a high capacity of the distribution.

Term
No projected expiry on record.
- Priority
- Filed
- Granted
- Today
17 claims: 4 independent, 13 dependent
- 1Patentkrav 1. Sätt för fördelning av lösa fibrer eller partiklar på en formyta, företrädesvis vid torrtillverkning av papper, vilken formyta består av ett rörligt perforerat bärband (20), varvid det material som skall fördelas, införes och med hjälp av materialagiterande organ (48, 48', 49) hålles luftfluidiserat i en långsträckt fördelarbehållare, som är utformad med en eller flera fibergenomströmbara väggar (16), vilka sträcker sig bort över bärbandet (20) och där materialet med hjälp av en genom bärbandet nedsugen luftström bringas att kontinuerligt utträda genom väggdelen (16) och avlagras på bärbandet, varvid materialet genom nämnda materialagiterande organ påverkas för rörelse med en hastighetskomposant, som är utåtriktad mot den genomströmbara väggdelen (16), kännetecknat av att materialet i behållaren påverkas för att utföra en likriktad generell strömningsrörelse utmed den genomströmbara väggdelen (16) i behållarens längdriktning, och att materialströmmen recirkuleras i denna frammatningsbana genom en återföringsbana, varvid man i den recirkulerade materialströmmen upprätthåller ett överskott av material i förhållande till det genom väggdelen (16) utströmmande materialet.
- 2Sätt enligt krav 1, kännetecknat av att återföringen av materialströmmen utföres i motsatt riktning utmed motsvarande genomströmbara väggdelar bort över bärbandet, varvid materialströmmen eller delar av denna likaledes utsättes för en mot dessa väggdelar utåtriktad påverkan.
- 3Sätt enligt krav 1 eller 2, kännetecknat av att man tillför nytt material till den cirkulerande materialströmmen vid ett eller flera områden utmed strömningsbanan.
- 4Sätt enligt krav 1, 2 eller 3, kännetecknat av att materialströmmen mellan frammatnings- och återföringsbanan styres utmed en utpräglat krökt bana, vid en yttre 7609350-9 Ύ del (62), av vilken eventuella klumpar avlägsnas från det passerande materialet.
- 5Sätt enligt något av krav 1-4, varvid såsom agiteringsorgari användes piskvingar (148) på en rotor, vars axel sträcker sig i behållarens längdriktning parallellt med den genomströmbara väggdelen, kännetecknat av att man utverkar eller understöder den likriktade materialströmningen utmed hela längden av den genomströmbara väggdelen (15) med hjälp av piskvingarna (5), åtminstone några av vilka är utformade eller anbragta för att alstra en likriktad axialfläktfunktion utmed hela nämnda längd, varvid vid återföring av materialströmmen utmed motsvarande utströmningsväggdelar (15) användes en ytterligare, motsvarande piskvingförsedd rotor, som roteras för att röra materialströmmen i motsatt axelriktning (fig. 6).
- 6Sätt enligt något av krav 1-4, kännetecknat av att man åstadkommer både den likriktade materialströmningen utmed hela längden av den genomströmbara väggdelen (16) och den mot denna väggdel utåtriktade kraftpåverkan av materialet med hjälp av ett antal i behållarens längdriktning inbördes separata, piskvingförsedda rotorer (42, 48) som roteras omkring parallella axlar, vilka var och en ligger i ett normalplan till väggdelen (16), varvid denna väggdel är snedställd i förhållande till de enskilda rotorvingarnas rotationsplan.
- 7Sätt enligt krav 6, kännetecknat av att materialströmmens returrörelse längs en motstående längsgående väggdel (16) åstadkommes med hjälp av samma piskvingförsedda rotorer (42, 48) genom att dessa är anbragta i fördelarbehållarens längsgående mittplan för påverkan av materialströmmen vid motstående längsgående väggar med inbördes motsatt rörelseriktning utmed dessa.
- 8Apparat för utförande av sättet enligt krav 1 innefattande en långsträckt materialfördelarbehållare (2) anbragt över ett rörligt bärband (20) för att mottaga ett skikt materialfibrer eller -partiklar från fördelningsbehållaren, vilken behållare har en tillförselöppning för fiber- eller partikelmaterial och en längsgående genomströmbar utströmningsväggdel (16) för successiv avgivning av i behållaren 7609350-9 is~ (1) fyllt material samt organ för agitering av materialet och påverkan av detta i riktning utåt mot utströmningsväggdelens (16) insida, varvid under det rörliga bärbandet är anbragt organ för nedsugning av luft genom det perforerade bärbandet för nedbringning och avlagring av de från fördelningsbehållaren avgivna fibrerna eller partiklarna på bandet, kännetecknad av att fördelningsbehällaren dessutom är förenad eller försedd med organ (48, 51) för påverkan av det i behållaren fyllda materialet för generell rörelse i en likriktad ström utmed utströmningsväggdelen (16) i dennas längdriktning bort över bärbandet (20) och med omlänknings- och återföringsorgan för recirkulation av den på detta sätt alstrade strömmen av luftfluidiserat material.
- 9Apparat enligt krav 8, kännetecknad av att de invändigt i behållaren anbragta organen för påverkan av det strömmande materialet är inrättade att i varje tvärsnitt av materialströmmen endast påverka ett delområde av denna med en mot utströmningsväggdelen (16) utåtriktad kraftkomposant.
- 10Apparat enligt krav 8,kännetecknad av att återföringsorganen för materialströmmen innefattar en genomströmbar väggdel (16) svarande mot den nämnda och anbragt på samma nivå och parallellt med denna samt samverkande med organ för agitering av returströmmen och åtminstone lokal påverkan av strömmen i riktning ut mot återföringsväggdelen (16).
- 11Apparat enligt krav 8, innefattande en piskvingförsedd rotor roterbart anbragt omkring en axel (5) som sträcker sig väsentligen vågrätt i behållarens längdriktning parallellt med utströmningsväggen (15), kännetecknad av att piskvingarna åtminstone delvis är så anbragta eller utformade att de vid rotationen påverkar materialet att röra sig i rotorns axelriktning i en och samma riktning utmed hela utströmningsväggen (16) (fig. 6).
- 12Apparat enligt krav 8 eller 9, kännetecknad av att utanför utströmningsväggen (16) är anbragt en rad piskvingförsedda rotorer, var och en med en rotationsaxel 7609350-9 /4 (42) liggande i huvudsak i ett normalplan till utströmningsväggen,’ och var och en utformad med piskvingar (48), vilkas spetsar i respektive rotationsplan bestryker ett litet tangentialområde av utströmningsväggen (16) som generellt är snedställt i förhållande till vingarnas rotationsplan.
- 13Apparat enligt krav 10 eller 12, kännetecknad av att den genomströmbara väggen (16) för materialgenomströmning resp, returströmning utgör symmetriskt motstående väggdelar i en behållare, i vilken de piskvingförsedda rotorerna är så anbragta i väggdelens symmetriplan, att piskvingarna (48) under sin rotation påverkar materialet vid bägge väggdelarna på samma sätt med avseende på agitering och utslungning mot respektive väggar (16) samt transport av materialet i respektive motsatta riktningar utmed dessa.
- 14Apparat enligt krav 12 eller 13, kännetecknad av att piskvingarna på två intilliggande rotorer är axiellt förskjutna från varandra, och att rotorerna är anbragta överlappande med inbördes avstånd, som endast är något större än radien för de längsta piskvingarna (48).
- 15Apparat enligt krav 12, 13 eller 14, varvid utströmningsväggdelarna utgöres av klassat nätmaterial, kännetecknad av att behållarens nederdel är utförd med längsgående nätsidoväggar (16) som konvergerar nedåt och på varje nivå har ett i huvudsak rätlinjigt förlopp i behållarens längdriktning, vilka sidoväggar (16) vid behållarändarna är inbördes förbundna med tätade pmlänkningsändväggdelar (6) vilka på varje nivå bildar en i huvudsak halvcirkulär övergång mellan nätväggarna (16).
- 16Apparat enligt krav 13, kännetecknad av att utanför de i förhållande till piskvingarnas rotationsplan snedställda, nedåt konvergerande genomströmningsväggdelarna (16) är anbragta plattdelar (50) för bildning av mot formbandet (20) nedåtriktade spolluftkanaler (54, 58) utmed utsidan av genomströmningsväggdelarna. 76093 50-9 i?
- 17Apparat enligt något av krav 8-16, kännetecknad av att organen för omlänkning av materialströmmen mellan dennas fram- och återgångsbana utgöres av förhållandevis kraftigt krökta ledytdelar som är anslutna till en utmatningsöppning (62) för tyngre partiklar i materialströmmen. 7609350-9 7609350-9 4δ· Elgii 7609350-9
Independent claims17
48 paragraphs in 2 sections, as filed
(24) Course day (62) Number of the application (86) International filing day (86) Filing date for the European patent application (30)
75-08-27 GB 35429/75
83-12-12
77-02-28
76-08-24
76-08-24 (11) Publication number 430 801
Application received as:
H Swedish patent application □ Completed international patent application with number □ converted European patent application with number
KB 3-A4 according to SIS 613013 allf Ι3β 83109 aa (71) Applicant: Torsten Bengt Persson, Maarslet DK (72) Inventor: Search (74) Representative: Wennborg G (54) Name: Method and apparatus for making a web-shaped material consisting of of loose fibers or particles (56) Published publications: SE 203 373 (B29J 5/04 M), SE 356 465 (B29J 5 / 04M), GB 1 376 356 (D01G 25/00), US 2 940 133 (19- 156)
7609350-9
IN
The present invention relates to a method for distributing loose fibers or particles on a mold surface, preferably in the dry production of paper and otherwise of the kind specified in the preamble of claim 1.
In order to provide a fiber layer for the practical production of, for example, paper, it is necessary to strive for both a large fiber spreading capacity and a high degree of uniformity of the layer of spread fibers.
British Patent Specification 1,376,356 discloses a plant in which the distributor container consists of a reclining cylindrical container with a winding or strip of mesh material having at the top a material supply slot extending along the entire length of the cylinder container. Inside the cylinder is an axial rotor, the needle tips of which extend along the inside of the coil. The fiber material is supplied through the said upper slot evenly throughout the length of the container, and inside the container, the radial needles on the needle rotor will whip the fiber material around and thereby keep it disintegrated and air-fluidized and partly affect it actively for gradual discharge through the mesh winding. effect on the air and fibers. The outgoing fibers are fed for deposition on the carrier belt or wire by means of an air stream which is sucked down from below through the perforated belt, and this air suction also acts directly on the air and the fiber content of the mesh cylinder, so that the fibers
7609350-9 are extracted therefrom, but with greatly increased capacity due to the action of the rotor needles with respect to leaching of the fibers and reorganization of the fibers directly inside the inside of the net wrapper.
At this plant, a fiber exit capacity of practically usable size is likely to be achieved, but the plant exhibits the serious inconvenience that for several reasons it will tend to form longitudinal strips in the material deposited on the carrier belt. Thus, it is a crucial condition that the material supply takes place completely evenly along said supply slot, since an increased supply at one or more local areas will result in a correspondingly increased fiber delivery from the grid cylinder precisely from this or these areas, ie. in a strip formation with increased thickness in the deposited product. Such a completely uniform material supply is very difficult to achieve, and in addition, there may be fiber clumps inside the net cylinder which are kept in rotation only by the needle rotor and thus will reduce the amount of fiber that can pass through the sub-regions of the cylinder. where such lumps occur. Hereby, strip thicknesses of reduced thickness will occur in the finished fiber product on the carrier belt.
By British Patent Specification 1,207,556, a plant is known where these problems are overcome, but in return the distribution capacity is very small. In this plant, a distribution container in the form of a cylindrical vessel with a flat, horizontal net bottom is placed slightly above the support band. A planar tube with two vertical shaft rotors is arranged in the tub, which by means of lower tubular vanes holds a fluid-filled fiber material in the tub to maintain a fluid bed of fibers, which can then exit from the bottom of the net for deposition on the carrier belt. The piping will work to distribute the material in the tub, so that
7609350-9 there are no special requirements for uniform material supply, and any lumps in the material will be carried around the vessel, so that they will not be stationary over one and the same delivery area of the fibers in relation to the direction of movement of the belt, ie. marked strip formation in the final product will be avoided.
In return, one must avoid an active internal leaching effect on the fibers, ie. the dispensing capacity of the distributor container will be largely determined only by the effect of the air sucked into the carrier belt. This suction air can excellently extract a significant flow of fiber blended air through the net bottom of the cylindrical vessel, but in order to achieve a practically reasonable fiber delivery capacity it must be ensured that the piping works sufficiently efficiently to keep the fiber material disintegrated. In addition, in practice, a considerable rotational speed of the pipe blades will be required, and at such a high velocity the blades will exert such a slurry of the material that there will be empty areas around the rotor shafts at the vessel bottom. The pre-low fiber delivery capacity will hereby be further reduced in that the suction air will have free access through the current, fully exposed areas of the net bottom, and in the circular bottom of the vessel, a thicker layer of fiber along the bottom diameter of the strip will also tend to deposit. direction of movement than out at the sides of the bottom surface.
SUMMARY OF THE INVENTION The object of the invention is to provide a method in which the fiber distribution can be carried out with high capacity and with little risk of strip formation in the product delivered to the carrier belt.
This is achieved according to the invention by the process steps specified in the characterizing part of claim 1. It will be seen that the invention is based on a new basic principle seen in relation to the known known methods, namely that in connection with an elongated advantage container in said recycling, it is provided to work with a still rather strong material flow along the container over the carrier belt. one can then achieve the desired high capacity through active influence in the outward direction of the material stream without local parts of the material, including any fiber clumps, permanently resides in the same dispensing area in the distribution container, and without requiring special uniformity in the material supply. The supply to the areas where the discharge of the material takes place can continuously proceed with considerable overcapacity, since the excess material is only recycled, and even if the material flow along the discharge wall will be thinned out due to the discharge of the material itself, this thinning will not precisely because of said overcapacity. to result in a noticeable reduction of material outflow along the outflow wall.
When, as stated in claim 2, the recirculating material stream is used for fiber delivery both in the forward movement and in the return movement, a further increased capacity is achieved. It should be noted that a strong flow of material inside the distributor container can be seen externally from the outgoing fibers having a certain velocity component in the flow direction, the concentration of the fibers delivered from the container to the carrier belt being increasing in the direction of the material flow. Thus, since the distributor container is transverse to the carrier belt, the transverse profile of the fiber product on the belt will be able to exhibit a corresponding increasing thickness from one side to the other, regardless of the distribution being fairly even, ie. without strip forming. Such an increasing thickness of the cross profile of the product will normally not be desired, but it turns out that it is precisely through the automatically specified in claim 2 that the necessary correction will be achieved in the direction of a completely uniform
7609350-9 profile thickness, namely, since the specified unevenness in the profile structure will also be present along the return current, but in the opposite orientation, the sum of the discharged from the two currents will result in a uniform thickness of the fiber layer on the movable support band.
When no special requirements for uniformity are set in the material supply, this can easily be done as stated in claim 3.
From a space point of view, it is advantageous to carry out redirection between the forward flow and the return flow of the material along the pronounced curved paths, if one does, cf. Claim 4 provides for the separation of any fiber clumps by utilizing the rather violent leaching action that such clumps will undergo upon passage through the heavily curved webs.
When using ejector whip blades in the distributor containers, as is known in principle by the above-mentioned British patent specification 1,376,356, the invention can be cf. claim 5, utilizing these wings to also provide or support the actual material flow.
The invention also relates to an apparatus of the kind defined in claims 8-17.
The invention is described in more detail by way of example with reference to the accompanying drawings, in which Fig. 1 shows a side view, partly in section, of a preferred apparatus according to the invention, Fig. 2 shows a sectioned side view of the same apparatus, Fig. 3 shows a detail of Figures 1 and 2 are top views, Figure 4 is a perspective view of Figure 1, partially in section, Figure 5 is a view of a modified detail, and Figure 6 is a perspective view of a modified apparatus according to the invention.
7609350-9
Fig. 1 shows an elongated fiber distribution container as a whole denoted by 1 and formed with two semi-circular end sections 2, whereby an upper half-cylinder part 4 and a lower, truncated cone formed part 6 with a semi-circular base plate 8. The end sections 2 are connected to vertical side plates 10 between the the upper cylinder portions 4, and these portions 2-10 are made of non-perforated metal sheet. Between the side plates 10 and the end portions 6 and 8 is mounted one in full with 12 bits bit screen bottom, which is permeable to fibers and air, and which has a U-shaped cross section corresponding to the end sections 2, ie. with a flat horizontal bottom sight portion 14 and two outwardly and upwardly inclined viewing surfaces 16. The container 1 is supported by supports 18 across a fine-mesh horizontal carrier belt hereinafter referred to as wire 20, which is endlessly guided around rollers 22 and driven by a drive station not shown in the direction shown by arrow. A suction box 24 with a suction fan 26 is arranged under the screen bottom 12 and the wire 20 and supported by beams 19 which are connected to the supports 18. The suction box is closed at the bottom and sideways and has an upper aperture 28 disposed tightly under the wire 20 and sealed against it by sealing flanges 30. One side of the suction box is provided with a horizontal slide damper 32 with a curved edge part 34 for controlling the sugar area, which is further described in the following. At one end portion 4 is mounted a bracket 36 which carries a motor 38 which, by means of a chain drive 40, drives four vertical shafts 42 running in bearings 44, which are mounted on transverse locks 46, which in turn are supported by the upper edges. of the side plates
10th The shafts 42 are arranged in a row in the vertical plane of symmetry of the container and are provided here with three pairs of diametrically opposed and radially mounted flat elongate rotor members 48, the length of which is adjusted such that during their rotation their outer peripheral parts will intersect at short distances from the sloping side surfaces 16, and in addition, the lower rotor means are disposed immediately above the bottom sight portion 14. The lower rotor members are arranged so that they rotate side by side in a common horizontal plane above the bottom sight portion 14, while the other rotor members are offset relative to each other and are arranged to rotate in areas that partially overlap.
Along its parallel long sides, the container is provided with exterior wall plates 50, which together with the side plates 10 form flush air ducts 52, the ends of which are closed by end pieces 54. the sloping screen surfaces 16 and the wire 20, which space is protected against the surrounding air except for the upper opening of the flush air duct 52. The lower edge of the wall plates 50 is bent and thereby forms an air lock 56, through which the wire can pass with a fiber layer deposited thereon as described below.
During operation, the shafts 42 are rotated in the same direction, the peripheral portions of the rotor members moving at a speed of about 50 m / sec. This rate is suitable for the treatment of, for example, cellulose fibers, but can be adapted to the desired product and vary widely. An air stream is produced through the screen bottom 12, the wire 20, the suction box and out through a suction fan 26. Similarly, air is drawn through the purge air ducts 52. A disintegrated material, e.g. cellulose fiber pulp, is fed to the container through a fiber spreading inlet 58 up to a level approx. in height with the other rotor means and intensively agitated by the fast-rotating means 48, which will whip violently through the material. In the unidirectional rotation of the rotor members, the fibrous material is thrown substantially toward the opposite sloping screen surfaces 16, the surface profile of the material extending substantially as indicated by a dotted line a in Fig. 2. The material carried by the slopes
7009350-9 a
the screen surfaces 16 are forced by the rotor means 48 to move along the respective surfaces in a relatively slow flowing current around the container along the sides and ends thereof. The fibers passing through such zones as are crossed by the rotor means are intensely whipped and repositioned and the fluidized state persists until the fibers with said current reach the next whipping area. Thus, the sloping screen surfaces 16 and the outer edge portion of the bottom screen portion are continuously coated by an efficient fluidized fiber stream, which can thus be immediately sucked through the screen bottom 12. After passing these screen surfaces, the fibers will follow the suction air and deposit on the wire 20 which separates the fibers from the air. thus forming a web of loose fibrous material carried by the wire through the lock 56 for fixation or for other desired purposes.
Some of the fibers will include due to static electricity being deposited on the inside of the outer wall 50, 54, but this is counteracted by the hollow air flow down the inside of these walls after being oriented in the duct 52. By sucking air in this way against the wire, there is also an increased effect of such a tendency that any sparse areas of the wire are filled due to their less suction resistance, whereby floating fibers are attracted at a concentration higher than the other along the wire. forming the desired even distribution of fibers thereon. In this way, if fibers are extruded to a greater extent from the sieve portions which are centered on such zones which are coated at a short distance by the peripheral parts of the rotor members, the resulting uneven distribution of fibers will be counteracted. It should be noted that the longest path of the fiber passage from the screen surfaces to the wire is from the upper screen surfaces, ie. in the areas near the highest rotational speed of the peripheral members of the rotor means, which means the most active areas for fiber outflow.
76093 50-9
The material stream inside the container is turned at each end section 2 and thrown around and up along the semi-conical sides 6 towards the region of the cylindrical end portion 4, from where the material is directed down the longitudinal side portions and bottom, etc. by means of a stop plate 60. During the turning of the stream, any heavier particles, lumps of fiber or other undesirable constituents in the region above the condenser at the periphery where they can be removed. For this purpose, there is provided a tangential outlet tube 62, the opening of which against the container is a gap partially blocked by a slidably mounted damper plate 64 for adjusting the gap height for controlling the discharge amount of e.g. foreign constituents. The outlet tube 62 can be connected to the container in a known manner by means of recycling means.
The rotor means 48 can take many forms for carrying out its whipping function, e.g. as shown in Fig. 5, where 42 indicates the lower end of the shaft 42 shown in the preceding figures, on which shaft are mounted two horizontal arm portions 48 corresponding to the rotor means 48, but at the outer ends connected by two oblique whip members 49. in this case, the shaft distances should be so large that a one-way rotation can be obtained. Preferably, the rotor means should be formed with more or less sharp leading edges, while the trailing edges may be flat or yet formed or provided with vortex-forming means for generating an aerodynamic turbulence to increase the fluidizing action.
The apparatus according to the invention need not necessarily be provided with three similar screen surfaces, in that, with careful selection of suitable meshes or perforated plates, a web material of loose fibers consisting of e.g. two outer layers of short fibers around an inner layer of long fibers in which the different fiber types are sorted by means of the selected screen types in question. Tests have shown that the apparatus is also useful for fibers with
7609350-9 greater in length than the type of fiber which can normally be treated in apparatus of the kind in question.
Fig. 6 shows a modified embodiment in which the rotor means are mounted on horizontal shafts. Reference numerals according to the preceding figures indicate equivalent means in Fig. 6. The container 1 is provided with a modified bottom part with a net 15, whose cross section is U-shaped with a flat center part. Parallel to this, two horizontal shafts 5 are provided with a set of rotor means 148 arranged to rotate in the same direction by a motor drive 38, 40, in which the outer peripheral portions of the rotary member 148 cover a region near the sight base 15 at right angles thereto. As indicated by rounded circumferential portions, some of the rotary means, designated 51, are designed with a slight rise as a propeller to form a stream of fiber mass along the curved side portions of the screen bottom 15 in one direction along one side and in the opposite direction along the other side. In this way, the rotary members serve the combined purpose of whipping the material and moving it around the container.
An important feature of the invention, which is common to both devices shown in Figures 4 and 6, is that the rotating means are arranged to rotate in a non-parallel plane relative to the screen surfaces 15, 16 with the peripheral parts working close to the screen surfaces to maintain a zone of effectively fluidized fibers, stitched by centrifugal forces are directed toward the screen surfaces 15, 16 mainly in the direction in which the fibers will immediately pass the screen surfaces. Another feature common to the two examples is the flow of the disintegrated material along the inside of the screen surfaces 15, 16, in view of an even flow of fibers through the screen surfaces 15, 16. The container 1 can be uncovered by a lid section of an air-permeable material which allows outflow of excess air, if the fibers
7 (509350-9), the container is supplied by means of a transport air quantity which exceeds the amount of air sucked out through the extractor fan 26 but keeps the fibers inside the container.
The amount of fiber in the container is controlled by the amount of feed relative to the output amount with respect to maintaining a constant profile of the fiber flow along the screen surfaces. However, experiments surprisingly show that it is possible to produce a web of evenly distributed fibers without maintaining said constant profile. However, it is possible to feed the fibers in saturated amounts at intervals and to constantly achieve a uniform fiber layer on the wire until the container is practically empty, which is a great advantage of the apparatus according to the invention.
The whip members may be of any suitable design, e.g. are designed to be wire elements, and they may be arranged to rotate in any suitable manner so that their peripheral portions are moved in rapid succession to and away from the viewing area cooperating with the whip member.
The slider 32 for controlling the sugar area can be divided into sections as indicated by dashed lines in Fig. 3. The sections can then be individually regulated to adjust the shape of the sugar area and in this way control any variations in the thickness of the fiber layer across the wire, ie. if the fiber layer is to be provided with a longitudinal zone, where the fiber layer is thicker or thinner, the section or sections below said zone shall be adjusted in such a way that the respective sugar area is increased and decreased, respectively. In continuous operation for an extended period, portions of the screen surfaces or the wire may become clogged by fibers or foreign components, a sparse zone being formed along the web. This can be counteracted by individually adjustable damper sections and can be controlled by automatic control. Obviously, this one
7609350-9 method of controlling the thickness of a web material obtained by suction is not only useful for correcting the uniformity of the fiber layer in cross-section, but can also be used advantageously as a control means for the thickness of the web-shaped material in general. In addition, these thickness control agents can be used in conjunction with plant types other than the present, ie. where a sub-constituent of a material is deposited on a mold surface by suction.
It should be noted that the oblique sieve surfaces should preferably be formed with free light areas seen in the direction of the centrifugal forces caused by the rotor means so as to assist in the penetration of the fibers by the sieve surfaces. A minor disadvantage in this will be that some fibers are directed directly to the inner surface of the outer wall plate 50, where they will be packed together with the risk of the fall of larger fibers accumulating on the newly formed fiber layer on the wire, but this risk is counteracted by the purge air flow. through channel 52. Another way of preventing this problem may be the replacement of the wall plate 50 with a horizontal roller, which, with a longitudinal part of its surface, uncovers the triangular space between the screen surfaces 16 and the wire. On such a roll deposited fibers can be removed continuously from the outside and the flush air duct 52 and the lock 56 can then be avoided.
7609350-9
Contents2
3 sheets
Sheet 1 Sheet 2 Sheet 3
32 members in 15 offices
Priority claims4
| Document | Office | Kind | Date |
|---|---|---|---|
| 3542975 | United Kingdom | A | |
| 3542975 | United Kingdom | A | |
| 3542975 | – | – | – |
| GB19750035429 | – | – | – |
Members32
| Document | Office | Kind | |
|---|---|---|---|
| BE845516A | Belgium | A | |
| IE43591L | Ireland | L | |
| DK379676A | Denmark | A | |
| FI762424A | Finland | A | |
| SE7609350L | Sweden | L | |
| NL7609531A | Netherlands (Kingdom of the) | A | |
| NO762912L | Norway | L | |
| DE2638687A1 | Germany | A1 | |
| FR2322073A1 | France | A1 | |
| JPS5256445A | Japan | A | |
| AU1702476A | Australia | A | |
| US4157724A | United States of America | A | |
| GB1559274A | United Kingdom | A | |
| CA1073624A | Canada | A | |
| FR2322073B1 | France | B1 | |
| AU510385B2 | Australia | B2 | |
| CA1088265A | Canada | A | |
| IE43591B1 | Ireland | B1 | |
| US4278113A | United States of America | A | |
| FI61223B | Finland | B | |
| FI61223C | Finland | C | |
| SE430801BThis record | Sweden | B | |
| USRE31775E | United States of America | E | |
| IT1064955B | Italy | B | |
| NO152659B | Norway | B | |
| DE2638687C2 | Germany | C2 | |
| DK149494B | Denmark | B | |
| DK149494C | Denmark | C | |
| NO152659C | Norway | C | |
| JPS6224125B2 | Japan | B2 | |
| NL185467B | Netherlands (Kingdom of the) | B | |
| NL185467C | Netherlands (Kingdom of the) | C |
1 legal event, as the office reported them to INPADOC
Events
| Event | Code | |
|---|---|---|
| Patent in forceNAL | NAL |
Numbers
- Publication, DOCDB
- 430801
- Publication, EPODOC
- SE430801
- Application
- 7609350
- Application, DOCDB
- 7609350
- Application, EPODOC
- SE19760009350
Titles2
- Swedish
- SETT OCH APPARAT FOR FRAMSTELLNING AV ETT BANFORMIGT MATERIAL BESTAENDE AV LOSA FIBRER ELLER PARTIKLAR
- English
- KIT AND APPARATUS FOR PREPARING A COATED MATERIAL CONSISTING OF LOOSE FIBERS OR PARTICLES
Classification
- CPC, 2
- D04H1/72
- D01G9/04
- IPC, 12
- B01F7 16
- B01J4 00
- B05C
- B05D1 12
- B65G47 19
- D01G23 00
- D01G25 00
- D04H
- D04H1 44
- D04H1 72
- D21F11 14
- D21H