EP4100223A1 - Chambre de dispersion par soufflage pour disperser et façonner un matériau apte à l'écoulement sur une bande de formage - Google Patents

Chambre de dispersion par soufflage pour disperser et façonner un matériau apte à l'écoulement sur une bande de formage

Info

Publication number
EP4100223A1
EP4100223A1 EP21706853.5A EP21706853A EP4100223A1 EP 4100223 A1 EP4100223 A1 EP 4100223A1 EP 21706853 A EP21706853 A EP 21706853A EP 4100223 A1 EP4100223 A1 EP 4100223A1
Authority
EP
European Patent Office
Prior art keywords
wall
area
chamber according
wind scattering
scattering chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21706853.5A
Other languages
German (de)
English (en)
Inventor
Christoph DEMEL
Klaus Plutowsky
Daniel Schwartze
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dieffenbacher GmbH Maschinen und Anlagenbau
Original Assignee
Dieffenbacher GmbH Maschinen und Anlagenbau
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dieffenbacher GmbH Maschinen und Anlagenbau filed Critical Dieffenbacher GmbH Maschinen und Anlagenbau
Publication of EP4100223A1 publication Critical patent/EP4100223A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/007—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and at least partly composed of recycled material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing
    • B27N3/10—Moulding of mats
    • B27N3/14—Distributing or orienting the particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres

Definitions

  • the invention relates to a wind scattering chamber for scattering and shaping a pourable material into a single or multi-layer material fleece on an endlessly revolving shaping belt, preferably in the course of the production of material panels in a press according to the preamble of claim 1.
  • the invention also relates to a method for scattering and shaping a pourable material into a single or multi-layer material fleece on an endlessly revolving shaping belt, preferably in the course of the production of material panels in a press according to the preamble of claim 40.
  • natural substances such as annual plants, lignified shrub plants, trees or the like are predominantly shredded, dried, mixed with a binding agent if necessary, scattered to form a material fleece and compacted in a press to form a material panel.
  • plastics or other materials is also provided in order to obtain flat strands of material during continuous production that can be divided.
  • the intermittent processing of the material fleeces is also conceivable; they can, for example, be divided up before pressing.
  • Today, in fiber or chipboard production, natural substances are increasingly being substituted with recycled material in order to minimize the need for fresh wood. It is common to combine wind scattering chambers with other scattering devices in order to achieve various layer structures.
  • One possibility for reducing the overall length of a wind scattering chamber would be to arrange more sieves or flow obstacles in the wind scattering chamber in order to accelerate the deposition of the material. Such an arrangement of many sieves is undesirable because the energy expended in operation for generating the ventilation or the air flow is unnecessarily destroyed without achieving sufficiently good advantageous effects. This usually also results in disturbing accumulations or clusters of material, which after hitting the forming belt produce noticeable entries in the mat and the later product material plate compared to the neighboring scattering.
  • the present invention is based in particular on DE 102009007944 A1.
  • a wind scattering chamber was presented which, due to different ceiling heights along the air flow, can set different room volumes in the wind scattering chamber.
  • the ceiling is designed as a variable cover which has variably adjustable ceiling areas. It is specified that the ceiling heights in the various chamber zones should be at a constant distance from the molding belt, and thus be aligned parallel to the molding belt. These can then, for example, be vertically adjustable in terms of their distance from the forming belt. Between the individual horizontal planes, inclined and / or curved transitions can be provided along the flow direction, which connect the horizontal planes.
  • a variant of the wind scattering chamber is shown, which along the flow direction several, in their Contains height differently arranged, horizontal ceiling elements, which are connected accordingly.
  • Such an arrangement of horizontal and height-adjustable ceiling elements has basically proven itself in practice, but still leaves room for improvement.
  • the invention is based on the object of creating a wind scattering chamber and a method for scattering and shaping a free-flowing material into a single or multi-layer material fleece on an endlessly rotating shaping belt which, in a short and concise length, meets the demands made by industry for high quality and the lowest possible raw material requirements.
  • the invention is based on a wind scattering chamber for scattering and shaping a free-flowing material into a single or multi-layer material fleece on an endlessly revolving molding belt in the course of the production of material panels in a press
  • the wind scattering chamber being a chamber with a material supply for introducing the material into has an air stream, the air stream entering the chamber via an inlet opening and preferably discharged at the other end of the chamber via an outlet opening, with a first room height in a first area of the chamber due to the distance between the ceiling and the molding belt and in Direction of flow in a further area, the room height is designed to be changeable.
  • the task for the wind scattering chamber is achieved in that in the second area below the ceiling there is a wall which continuously reduces the room height and in the third area a wall which continuously increases the room height.
  • the invention understands by continuous that the height of the room along the wall continuously decreases or increases in the direction of flow.
  • a chamber has a ceiling, side walls along the direction of flow and front and rear transverse to the direction of flow and a floor.
  • the bottom can also be formed by the molding tape if a more open construction is chosen.
  • the room height is defined as the distance between the material-receiving molding tape and the ceiling or the wall of the chamber.
  • the flat ceiling is essentially covered with a wall that has a predetermined geometric shape and predominantly a lower height of the chamber, between the molding band and wall, than in the first area of the chamber, in which the air flow and the material into the Chamber enters.
  • the wall transversely to the air flow or the shaping belt is preferably flat or straight, but can also be bent completely or only on the outer sides, i.e. on the side surfaces of the chamber, depending on the properties. This can be useful for adapting the flow conditions at the wall / side wall transition.
  • the chamber has exactly three or four of the named areas.
  • the reversal point thus the lowest point of the wall, defines the boundary between the second and third area.
  • the transition between the fourth and third area is when the rise of the wall ends in the third area and merges into a fourth area of a wall or the ceiling that is arranged parallel to the molding strip. If the rise in the wall continues until the air flow ends, the chamber only has three areas.
  • the transition between the first and the second area is at the point where the wall begins to decrease in height from the ceiling.
  • the wall begins after the filling opening for the material in the chamber.
  • the first area would then only be the filling opening itself, the room height then corresponds to the distance from the molding belt to the filling opening, or the ceiling height.
  • a particular advantage of the invention is that the possibility of adjusting the walls in accordance with the teaching of the invention means that the operator or supplier of the wind scattering chamber is now able to adjust the length of the various areas depending on the intended use.
  • the reversal point in the chamber can be adjusted as required in terms of the distance from the forming belt, but also in terms of its distance from the entry of the air flow into the chamber and adapted to requirements.
  • the invention has also surprisingly found that the previous technical effort in the wind scattering chambers for a homogeneous and smooth transition of the particle size in a layer to be scattered does not have as great an effect on the quality of the plate as previously assumed. It is entirely possible to divide the wind scattering chamber into areas of different heights, with predominantly the coarse fractions being deposited in the flow direction in a first deposit area and the comparatively fine particles lying in a relaxed air flow in a second chamber area.
  • a stepped classification is therefore particularly preferred, which is caused by the differences in the flow velocities. This difference can be supported by a flow obstacle, especially in the area of the transition between the different heights of the room.
  • the invention also has the possibility of reducing the overall length of the wind scattering chamber, with as free a flow as possible and preferably by dispensing with or reducing the flow resistances (sieves) that have been customary up to now.
  • flow vectors are used with the constant reduction of the room height in order to strengthen the classification, in particular when the wall is designed in the form of drops, which will be described in detail later.
  • the performance of the fan can be reduced and / or the throughput rate per unit of time can be increased, in particular with the same or even improved quality.
  • the wall for changing the room height can be made of sheet metal or a plastic, preferably made of a less adhesive material, for example antistatic or slightly adhesive for binders, so that the material used for the material plate does not stick there. Also the use of natural wood or Material plates is conceivable.
  • the wall particularly preferably consists of elastic or flexible elements, which are thus adjustable, but most preferably have sufficient resistance or rigidity in order not to be deformed or caused to vibrate by the air flow during operation.
  • a conveyor belt or conveyor belt would be conceivable, which is suspended from the ceiling in the direction of flow at the front and rear.
  • the wall or the ceiling should be arranged over the entire width of the chamber.
  • the wall can particularly preferably have a convex or concave shape over the width in order to do justice to the flow conditions or the friction on the side walls.
  • a constant change in the height of the room means that no horizontal / horizontal holding line for the wall, in particular with respect to the molding band, should be introduced in this area.
  • a preferably horizontal holding line is arranged at which the room height does not change or only changes slightly. This route forms a transition between the areas.
  • This transition can prevent disruptive influences from being "carried along" from a previous area to the following area. Disruptive influences are fluidic disadvantages such as eddies, different vectors in the speed or orientation of the air flows.
  • the inclination of the section preferably does not exceed 25 ° with respect to the forming belt, the inclination is particularly preferably less than 12.5 °, most preferably less than 5 °.
  • the section or the area around the reversal point is shaped as a downwardly directed arrowhead, the reversal point forming the tip and inclined sections in or opposite to the direction of flow being arranged opposite the forming belt.
  • the air flow is arranged in the region of the chamber essentially parallel to the forming belt. This is intended to mean that the air flow along the Forming belt is guided, changes in the height of the room still lead to the air flow being guided along the forming belt, even if individual vectorial differences in the air proportions within the air flow may be present, for example if the height of the room is reduced.
  • the air flow can be guided parallel to the forming belt in the entry area, but angled air flows within the meaning of the invention are also conceivable, in particular in order to optimize the material input or the material distribution in the air flow. It can thus be assumed that in the area where the air flow is introduced into the chamber, if baffles, nozzles and / or registers are arranged here, they are not necessarily designed in parallel.
  • straight or curved walls can be arranged in the flow direction to change the height of the room, as long as the solution or the teaching of the invention is fulfilled.
  • a screening device preferably for the coarser portions of the material, can preferably be arranged in the first area or in the following areas.
  • At least one, preferably two, most preferably three or more sieve grids are preferably arranged as the sieve device in the air flow.
  • a coarse screen and / or a roller bed composed of coaxially arranged spreading rollers can be arranged, in particular in order to remove oversizes from the material and remove them from the manufacturing process.
  • the outlet opening or at least one further outlet opening on the ceiling or the wall of the chamber can be arranged in the fourth area.
  • this outlet opening can be arranged in the fourth area at the top of the ceiling.
  • a wall reducing the room height along a first straight line or a second curvature and, after a reversal point in a third area, a wall increasing the room height along a second straight line or second curvature can be arranged in the second area.
  • At least the curvature of the wall in a sectional side view of the chamber has essentially the geometrical outside of one half of a drop cut along its plane of symmetry. This is preferably mapped from a hemispherical shape to a pointed end or vice versa in the chamber.
  • the invention understands the drop shape to be a ball tapering to a point on one side; this occurs physically when a drop is about to be detached, that is, during the formation of the drop.
  • the wall preferably does not follow the teardrop shape over the width of the molding belt, but rather is arranged flat or parallel to the molding belt.
  • a radius of the first curvature of the wall in the first area can be made smaller than the radius of the second curvature, with a ratio of the first radius to the second radius of 1 to 2, preferably of 1 to 5 and very particularly preferably of 1 to 10, can be used.
  • the radius of the first curvature of the wall in the first area can be made larger than the radius of the second curvature, with a ratio of the first radius to the second radius of 2 to 1, preferably of 5 to 1 and very particularly preferably of 10 to 1, can be used.
  • the radii of the curvature in the second or third region are particularly preferably designed to decrease and / or increase along the air flow. This benefits the evenness of the air flow and avoids turbulence.
  • the wall is preferably designed to be essentially parallel transversely to the molding strip.
  • the geometric shape of the wall for adjusting the height of the room can be arranged invariably. This is intended to indicate a fixed geometry. This is particularly advantageous when the geometric shape of the wall is formed based on a simulation calculation of the flow behavior of the air flow and is thus already optimized. Differentiated settings during operation for optimization should then not be necessary. This is particularly advantageous if the materials or material mixtures used for the material fleece do not experience any changes in production that have an influence.
  • Possibilities for adjusting the wall (s) can be preferred if the material throughput per unit of time is intended to be changed in an industrial-technical application.
  • Mixtures of materials can for example consist of fibers, shavings, chips from "fresh” wood, which means that these particles are on the one hand from machining processes directly for panel production or as offcuts from wood production (sawmills, chippers, chippers) Untreated wood, originated, and mixed with waste wood from recycling on the other hand.
  • the room height in the fourth area of the chamber is preferably lower than in the first area. This also applies to a wall if it extends into the fourth area.
  • a route could be arranged at the reversal point in which the room height does not change or only changes slightly.
  • This route forms a transition between the areas.
  • This transition can prevent disruptive influences from being "carried along" from a previous area to the following area.
  • Disruptive influences are fluidic disadvantages such as eddies, different vectors in the speed or orientation of the air currents.
  • the inclination of the section preferably does not exceed 25 ° with respect to the forming belt, the inclination is particularly preferably less than 12.5 °, most preferably less than 5 °.
  • the section is shaped as a downwardly directed arrowhead, the reversal point forming the tip and sections inclined in or against the direction of flow being arranged opposite the forming belt.
  • the wall in the second and third area can be designed symmetrically with respect to a plane of symmetry which is perpendicular to the molding strip and which passes through the reversal point.
  • a plane of symmetry which is perpendicular to the molding strip and which passes through the reversal point.
  • the room height can be reduced along a negative gradient in the second area in the flow direction and the room height can be increased along a positive gradient in the third area in the flow direction. This serves, among other things, to avoid turbulence.
  • a flow obstacle can be arranged between the forming belt and the wall in the second, third area and / or at the level of the reversal point. This enables the material to be deposited more quickly and can help to shorten the overall length of the wind scattering chamber.
  • the flow obstacle can preferably be designed as a grid, rods and / or a rotating roller.
  • a grid, a sieve or a rod arrangement can preferably be designed to be horizontally and / or vertically variable in its length or in its size.
  • the flow obstacle can begin directly, or as close as possible, above the material on the molding belt and extend to the wall, or there are spaces between the molding belt and the wall. For example, it can be intended to arrange a free area in the area between the wall and the flow obstacle so as not to slow down the flow too abruptly. In this respect, it would be advantageous if the flow obstacle is arranged at a distance from the wall and / or from the molding band / material fleece.
  • the flow obstacle in its position and / or Position in the chamber would be arranged adjustable and the adjustability would preferably be realized via controllable adjusting means.
  • the walls in the second area and third area, preferably together with the wall of the fourth area can be connected to one another in an articulated manner or formed in one piece.
  • the joints can have devices for specifying the maximum angle of rotation or a predetermined angular range. This is particularly advantageous when adjusting means are arranged on the suspension of the walls or on the walls themselves.
  • the walls in a side view of the chambers, have the outer shape of half an idealized drop (in side view), cut along the line of symmetry of the drop.
  • half a teardrop shape of the walls would be recognizable.
  • the sectional plane of the figure is perpendicular to the plane of symmetry of the drop, which is arranged parallel to the ceiling of the chamber.
  • the tip of the drop should be aligned either in or against the air flow.
  • the walls can preferably be designed as a flexible belt or a belt, preferably made of a material similar to or for a conveyor belt. Rubber compounds, with or without reinforcements, can be used.
  • a flexible belt or band offers sufficient flexibility with a conceivable adjustment or adjustment of the walls, usually in connection with good antistatic properties. They also offer the option of compensating for changes in the chamber geometry due to temperature fluctuations during operation.
  • adjustable or adjustable, stiffening elements can be provided within the wall and / or along the ceiling-side surface of the wall.
  • adjustable or adjustable, stiffening elements can be provided within the wall and / or along the ceiling-side surface of the wall.
  • adjustable or adjustable, stiffening elements can be used here in conjunction with adjustment elements or other adjustment means, the inherent rigidity of a wall can be increased and / or adjusted. These can be set up statically before commissioning or designed to be adjustable dynamically during operation.
  • the rear part of the wall viewed in the direction of flow, is made more rigid than the part of the walls located in front of it.
  • the rear part would therefore be oriented steeply in the direction of the molding band if it was suspended from the ceiling and would only begin to form a curve towards the end of the stiffening (against the direction of flow).
  • This almost automatically results in a teardrop shape which can be particularly preferably supported by the connections between the ends of the walls or with the ceiling as well as spacer or stiffening elements.
  • the walls have stiffeners transversely to the direction of flow, preferably over the entire width, in the middle and / or in the vicinity or in the region of the side walls. In this way, pressure increases due to the air flow and / or the material inside the chamber at the transitions between the side wall / walls can be counteracted.
  • the invention understands transversely to the forming belt the orientation transversely to the transport direction of the forming belt.
  • the term about the width of the molding belt can also be understood in a similar manner, since the molding belt is arranged circumferentially along its length and has a width.
  • the width of the molding tape essentially corresponds to the width of the chamber, with marginal deviations being conceivable depending on the sealing principle.
  • sealing elements preferably sealing lips on the walls, are arranged between the walls and the side walls of the chamber. This avoids contamination of the area between the walls and the ceiling. It also improves the adjustment properties of the walls if no material can be introduced here.
  • Another special embodiment would be the arrangement of a fixed point at least one side wall and / or on one of the wall, preferably an adjustable fixed point.
  • a specific shape can be specified or influenced by such a fixed point if this cannot be achieved by the wall itself.
  • Such a fixed point can also be suitable for influencing the shape of the walls when they are moved by adjusting drives.
  • the reversal point as the smallest room height, is fixed while the shape of the walls, for example a one-piece or articulated band, is moved on its suspensions and thus changes the gradient of the rising and falling room height.
  • This fixed point can also be implemented from the outside by insertable bolts which are inserted or removed from predetermined closable bores in the chamber. These can also be automated and / or adjustable in height and position along the chamber in link grooves.
  • fixed connections and / or adjusting elements for influencing the geometry of the wall can be arranged in operative connection with the wall and the ceiling.
  • slides or similar machine elements can lift the walls at predetermined locations through the ceiling or press them down.
  • a one-piece wall can be arranged over several areas, i.e. the beginning of the wall in the second area and the end of the wall in the third or fourth area, with only the beginning and the end preferably being arranged on the ceiling.
  • an adjustment of the position of the wall in the chamber and / or the geometry of the wall or the beginning and / or the end of the wall can be adjusted with a displacement device, preferably parallel to the ceiling.
  • a simple slide preferably parallel to the forming belt, can be arranged on the ceiling, the at least one suspension of the wall moves.
  • this slide can also connect two walls to one another and move them against one another in order to adjust the geometry and / or the position or the suspension of the walls.
  • the room heights of the second area and the third area are preferably the same only at the reversal point.
  • a substantially horizontal holding line in the area of the reversal point on the adjacent part of the wall, can be arranged, on which the room height does not change or only changes slightly.
  • the angle of inclination of the holding line can be designed to be less than 25 °, particularly preferably less than 12.5 °, most preferably less than 5 ° with respect to the shaping belt.
  • the holding line starting from the reversal point, can extend into both adjacent areas of the walls and particularly preferably be shaped as a downward arrowhead, the reversal point forming the tip and inclined sections in or against the flow direction being arranged opposite the forming belt.
  • the invention understands the term flexible wall in such a way that the geometry of the wall can be influenced by adjusting or other means. It is there preferably it is not provided that the air flow with the material within the chamber should cause a change in the geometry during operation.
  • the number, arrangement, orientation, size and permeability of all sieves, for example the sieve device, the sieve, in the chamber can be designed to be variably adaptable, preferably via actuators.
  • latching elements preferably magnets and / or areas protruding from the walls / side walls
  • latching elements can be arranged laterally on the walls, which are most preferably in operative connection with corresponding counter bearings on the side walls / walls or in Can be brought into operative connection during an adjustment of the geometry of the walls.
  • these measures are indicated under certain circumstances. These means also seem to make sense for the reproducibility of adjustable wall geometries.
  • Grooves, blind bores, protrusions, magnets and / or other machine elements can be arranged on the inside on or in the side walls, which with corresponding counter bearings of the walls exercise a locking or holding function. The reverse also applies accordingly. In order to increase the stability and the steadfastness against the air flow of the transition wall / side wall, these measures may be useful. In the event of an operational change in the geometry of the walls, predetermined latching positions by means of interventions or markings on the side walls can be useful. This is used in particular for the reproducibility of settings for the geometry of the walls in specific production modes or in order to be able to return precisely to previous settings.
  • a corresponding method for scattering and shaping a free-flowing material into a single or multi-layer material fleece on an endlessly revolving molding belt in the course of the production of material panels in a press is based on a known wind scattering chamber, which has a chamber with a material supply for introducing material into has an air stream, the air stream entering the chamber in a first area via an inlet opening and discharged at the other end of the chamber via an outlet opening, a room height is formed in the distance between the ceiling of the chamber and the molding belt.
  • the object for a method is achieved in that the room height is reduced in a second area in the flow direction and the room height is continuously increased in a third area through the wall between the ceiling and the molding belt.
  • the air flow is particularly preferably guided through a flow obstacle, for example a sieve, in order to deposit the coarse portions of the material more quickly on the forming belt.
  • a flow obstacle for example a sieve
  • the drawing shows schematically a wind scattering chamber for producing a material fleece on a forming belt in the course of the production of material panels, a wall for changing the height of the room being arranged in the wind scattering chamber.
  • material 8 is introduced into chamber 1 of wind scattering chamber 10 via a material supply 22, moved by an air flow 13 opposite to the conveying direction of the forming belt 12 and onto the chamber 1 in areas I, II, III, IV Shaping tape 12 is deposited as material fleece 11.
  • a roller for loosening up the material is arranged above the air flow 13.
  • the air flow 13 arriving through the air supply 24 enters the chamber 1 through the inlet opening 14 and moves the material 8 in the flow direction 7 of the air flow 13.
  • the chamber 1 is divided into four areas I, II, III, IV and the air flow 13 flows through them accordingly consecutive numbering.
  • the ceiling 23 forms a room height 2a with the molding band 12 delimiting the chamber 1 at the bottom.
  • a sieve device 17 in which at least one sieve grid 18 is arranged.
  • a coarse screen 19 can be arranged essentially parallel to the forming belt, which separates oversized material from the process through its thermal connection with a discharge device 25.
  • a roller screen formed from coaxial rollers can also be arranged in order to homogenize the incoming material 8.
  • the room height 2a changes due to the arranged wall 4 with the room height 2b.
  • the wall 4 can represent different geometries which have the lowest room height 2b in the flow direction 7 at the end of the area II.
  • the reversal point 9 would also be arranged there, which marks the transition to the third area III, at which the wall 5 is arranged in such a way that the room height 2c increases again in the direction of the flow direction 7.
  • the walls 4, 56 can have different geometries, with the first wall 4 having a first radius 20 and the second wall 5 having a second radius 21 in the present exemplary embodiment. These radii can be designed the same but also different.
  • the area IV is arranged with the room height 2d, which has an outlet opening 15 at the end, from which the air flow 13 can be removed from the chamber 1 again.
  • the outlet opening 15 can be arranged on the ceiling 23 or, if present, on a wall 6 located in this area.
  • the wall 6 or the ceiling 23 can form a lower room height 2d than the room height 2a in the first area I.
  • An additional or single outlet opening 16 is particularly preferably arranged at the transition between the third area III and the fourth area IV.
  • a flow obstacle 3 can be arranged in the second area II or in the third area III, which brakes the air flow 13 or the material 8 in the air flow 13. Due to the flow obstacle 3, in particular the comparatively larger particles of the material 8 that are still present are slowed down and moved in the direction of the forming belt 12.
  • a cover layer is scattered, whereby the finest particles of the material 8 first come to lie on the forming belt 12, which is moved against the air flow 13 or the flow direction 7, and thus form a sub-layer of a multi-layer material fleece 11 when in the running direction of the Forming belt 12 still further spreading machines and / or wind spreading chambers are arranged.
  • the subsequent wind scattering chamber will then be arranged the wrong way round in order to deposit the smallest particles on the surface of the material fleece.
  • a preferred teardrop shape of the walls 4 and 5 was not shown in the drawing. However, it was indicated by way of example that the wall 5 has a preferably approximately straight reinforcement in the rear area, the wall 5 is drawn thicker here. This can be useful in the case of a flexible material of the wall in order to preferably depict geometries of the walls, for example in the case of wall 5 a stronger gradient of the increase in the room height 2c compared to the gradient of the decrease in the room height 2b.
  • the suspension of the wall 4 on the ceiling 23 could be displaced against the air flow 13 by means of a slide, symbolically represented by a double arrow. As a result of the stiffening, the curvature along the wall 4 will flatten out, while the curvature 5 would change less strongly due to the stretching of the distance between the suspension points of the walls 4, 5.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Nonwoven Fabrics (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Air-Flow Control Members (AREA)

Abstract

L'invention concerne une chambre de dispersion par soufflage et un procédé pour disperser et façonner un matériau apte à l'écoulement (8) de manière à former un non-tissé (11) sur une bande de formage (12) circulant en continu, au cours de la fabrication de plaques de matériau dans une presse, la chambre de dispersion (10) présentant une chambre (1) munie d'une alimentation en matériau (22) destinée à introduire le matériau (8) dans un flux d'air (13), une première hauteur d'encombrement (2a) étant réalisée dans une première zone (1) de la chambre (1) par un certain espacement entre une partie de recouvrement (23) et la bande de formage (12), et la hauteur d'encombrement étant réalisée de manière variable dans une autre zone (II,III, IV) dans la direction de circulation (7) . Une paroi (4) réduisant en continu la hauteur d'encombrement (2b) est agencée dans la deuxième zone (II) au-dessous de la partie de recouvrement (23) et une paroi (5) augmentant en continu la hauteur d'encombrement est agencée dans la troisième zone (III).
EP21706853.5A 2020-02-07 2021-02-08 Chambre de dispersion par soufflage pour disperser et façonner un matériau apte à l'écoulement sur une bande de formage Pending EP4100223A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020103233.1A DE102020103233A1 (de) 2020-02-07 2020-02-07 Windstreukammer und Verfahren zum Streuen und Formen eines rieselfähigen Materials auf einem Formband
PCT/EP2021/052990 WO2021156520A1 (fr) 2020-02-07 2021-02-08 Chambre de dispersion par soufflage pour disperser et façonner un matériau apte à l'écoulement sur une bande de formage

Publications (1)

Publication Number Publication Date
EP4100223A1 true EP4100223A1 (fr) 2022-12-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP21706853.5A Pending EP4100223A1 (fr) 2020-02-07 2021-02-08 Chambre de dispersion par soufflage pour disperser et façonner un matériau apte à l'écoulement sur une bande de formage

Country Status (4)

Country Link
EP (1) EP4100223A1 (fr)
CN (1) CN115087529B (fr)
DE (1) DE102020103233A1 (fr)
WO (1) WO2021156520A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021004823A1 (de) 2021-09-26 2023-03-30 Dieffenbacher GmbH Maschinen- und Anlagenbau Windstreukammer und Verfahren zum Streuen und Formen eines rieselfähigen Materials auf einem Formband

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1929465A1 (de) * 1969-06-10 1970-12-23 Andre Mark Vorrichtung zur Herstellung von Holzfaserplatten
IT1146772B (it) * 1981-04-23 1986-11-19 Daneco Danieli Ecologia Spa Dispositivo aerobalistico di frazionamento dei materiali presenti nei rifiuti solidi urbani pretrattati
US5333797A (en) * 1992-04-03 1994-08-02 Becker John C Commingled recyclables recovery and recycling process and related apparatuses
DE19835419A1 (de) 1998-08-05 2000-02-10 Kvaerner Panel Sys Gmbh Vorrichtung und Verfahren zur Windsichtung
US6902125B2 (en) * 2000-05-24 2005-06-07 Fritz Schneider Process and device for disintegrating irregularities in flows of wood fibres
FI117129B (fi) * 2004-05-19 2006-06-30 Metso Panelboard Oy Menetelmä ja laitteisto lastujen sirottelemiseksi
DE102006038183A1 (de) 2006-08-14 2008-02-21 Dieffenbacher Gmbh + Co. Kg Verfahren und Streumaschine zur vollständigen oder schichtweisen Herstellung einer Streugutmatte
DE102009007944A1 (de) 2009-02-06 2010-08-12 SCRIBA, Jörg Vorrichtung zum Streuen eines rieselfähigen Materials zu einem ein-oder mehrschichtigen Materialvlies
DE102009047125A1 (de) * 2009-11-25 2011-05-26 Dieffenbacher Gmbh + Co. Kg Anlage und Verfahren zur Formung einer Streugutmatte aus Streugut auf einem Formband im Zuge der Herstellung von Werkstoffplatten
DE102016113014B4 (de) * 2016-07-14 2020-03-05 Dieffenbacher GmbH Maschinen- und Anlagenbau Streuanlage und Verfahren zur Herstellung einer Streugutmatte im Zuge der Herstellung von Werkstoffplatten
DE102017124063A1 (de) * 2017-10-16 2019-04-18 Dieffenbacher GmbH Maschinen- und Anlagenbau Streuanlage und Verfahren zur Herstellung einer Streugutmatte im Zuge der Herstellung von Werkstoffplatten

Also Published As

Publication number Publication date
WO2021156520A1 (fr) 2021-08-12
DE102020103233A1 (de) 2021-08-12
CN115087529B (zh) 2025-06-17
CN115087529A (zh) 2022-09-20

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