US3897185A - Apparatus for spreading material serving for the manufacture of fiberboards - Google Patents

Apparatus for spreading material serving for the manufacture of fiberboards Download PDF

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Publication number
US3897185A
US3897185A US413424A US41342473A US3897185A US 3897185 A US3897185 A US 3897185A US 413424 A US413424 A US 413424A US 41342473 A US41342473 A US 41342473A US 3897185 A US3897185 A US 3897185A
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Prior art keywords
particle
outlet openings
mixture
centerline
path
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Expired - Lifetime
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US413424A
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English (en)
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Reinhardt Beyer
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Bison Werke Baehre and Greten GmbH and Co KG
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Baehre & Greten
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    • 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

Definitions

  • the lower part of the registers include openings facing oppositely to one another and away from the center line of the stream of particles and spaced from one another to permit passage therebetween of a central portion of the mixture without further modification.
  • Baffie plates are also provided in preferred embodiments to assist in preventing further classification of the central stream in the lower regions of the registers.
  • the baffle plates are vertically adjustable so as to accommodate varying conditions for desired varying thickness boards to be formed by the layers of particles passed through the distributing chamber containing the air classifying registers.
  • This invention relates to apparatus for the spreading or scattering of fiber or chip fleeces made up of a mixture of cuttings of extremely fine or superfine, fine, and coarser glue-covered chips for the subsequent press forming into fiberboards and the like.
  • Preferred embodiments of this invention include a distributing chamber disposed above a fleece or particle carrier and of air register groups arranged in the distributing chamber.
  • the register groups are mutually opposed to each other in mirror-image relationship at a distance from each other and are laterally offset with a gap in between.
  • the mixture of cuttings is introduced from above in between these register groups.
  • Air currents which are controllable in their velocity are fed to these register groups and exit from the register groups at opposite sides of a particle supply path in opposite directions.
  • the present invention is based on solving the problem of manufacturing, by means of a single apparatus of the type mentioned in the foregoing, relatively thin fiberboards, as well as relatively thick fiberboards, so that the superficial or cover layers in case of each board thickness have a maximally uniform proportion of fime and extremely fine or cutting fibers, and so that furthermore, in case of relatively thick boards, a sufficient amount of fine particles is present in the central layer with the coarser particles i.e., the central zone of the finished fiberboards contains practically all other fine and coarser particles, except for the extremely fine components supplied to the cover layer, although, a homogeneous mixture of extremely fine, fine, and coarser particles is being introduced at a single feed point location where the material is fed for spreading purposes.
  • the present invention contemplates providing particle screening apparatus with upper regions of opposed register groups having outlet openings facing each other, and lower regions of opposed register groups having outlet openings facing away from each other with the outlet openings facing away from each other having such a mutual distance that a space remains therebetween where an unscreened portion of the mixture of cuttings can fall downwardly.
  • the superfine particles and also a certain portion of the fine particles are air-classified or screened for the formation of the two cover layers by both the upper and lower regions of register groups, the screening process is practically eliminated for the other particles constituting the central layer which pass between the lower regions without further classification.
  • baffles it is advantageous according to another feature of this invention to arrange at least two level-adjustable or vertically adjustable baffles in the space between the outlet openings. With these baffles, the quantity of the practically unscreened particles can be varied as these baffles act to limit effects of the air flow on the central stream of particles, as well as guide the flow of the central stream.
  • a preferred advantageous embodiment of the present invention includes a pair of transverse plates extending completely across the width of the distributing chamber at respective opposite sides of a centerplane through the path of particles to form a guide chute for the portion of particles not to be screened by the lower regions of register groups.
  • Obliquely oriented baffles are provided between the registers of each register group and are displaceable with respect to portions of said respective transverse plates disposed in the same planes as said baffles.
  • the baffles provided between the registers of the two register groups are to be shifted downwardly onto the corresponding transverse plates, and the velocity of the screening air streams is to be selected, for example by increasing the number of revolutions of the blower or blowers associated therewith, so that a spreading effect is obtained which is similar to that obtained by the aforementioned conventional spreading device.
  • the difference in operation as compared to the state of the art in this production of thin fiberboards resides in that the air velocities employed in the novel apparatus of this invention are higher than those of the conventional spreading devices.
  • baffles are pushed outwardly in the upward direction, and the speed of the air streams conducted through the registers is reduced. A portion of the fiber mixture fed from above to the register groups,
  • a central layer is formed consisting of fine and coarser particles, without the necessity for providing several feed points to spread the material.
  • registers of both register groups of ducts connected to the outlet openings of the registers so that the flow direction of the air streams can be controlled more effectively than in the case where the registers consist of boxes which are merely equipped with outlet apertures (see German Utility Model No. 7,037,391).
  • the ducts terminating in the lower zone of the registers are preferably oriented obliquely downwardly toward the fleece carrier in a manner known per se (German Utility Model No. 7,037,391).
  • the transverse plates extending obliquely to the plane of symmetry of the register groups can each be provided with an extension piece, forming together a kind of guide chute for the fiber mixture of fine and coarser particles to be applied.
  • Each extension piece is also preferably adjustable with respect to the transverse plate.
  • a preferred advantageous embodiment of the invention includes two spiked rolls underneath the guide chute; the arrangement and structure of these rolls being explained below.
  • FIG. 1 is a longitudinal sectional schematic view of a device for spreading a mixture of particles onto a particle carrier for subsequent pressforming into fiberboards and the like;
  • FIG. 2 is a sectional schematic view corresponding to a portion of FIG. 1 and illustrating apparatus constructed according to a preferred embodiment of the present invention
  • FIG. 3 is a sectional schematic view similar to FIG. 2 and illustrating apparatus constructed according to another preferred embodiment of the present invention.
  • FIG. 4 is a partial schematic view taken along the center plane of and at right angles to FIG. 3 and and showing the registers of a register group of the apparatus of FIG. 3.
  • the distributing chamber 1 can be moved, by means of rollers 2 running on rails 3, over or above a conveyor belt 4, on which belt 4 the particles fed from above into the distributing chamber 1 are placed in the form of a fleece.
  • the particles first pass from a feeding means, not shown, into a container 5 arranged above a feeding belt 6, which latter is guided over a driven drum 7 and an idling drum 7'.
  • the feeding belt 6 operates so that the particle mixture 8 is conducted toward the right. or in the direction toward the discharge end of the container 5.
  • Rotary rakes 9, l0, and 11 are disposed at right angles to the traveling direction of the conveyor belt 4.
  • These rakes 9, 10, ll rotate in the clockwise direction and throw the respectively uppermost stratum of the mixture 8 toward the left and away from the discharge end of the storage container 5.
  • the rotary rakes 9, I0, and 11 are mounted on axles so that the depth of the bed formed by particles 8 at the discharge end of the container 5 is suitable for the introduction of the particles into the distrubuting chamber 1.
  • the belts 4, 6 and rotary rakes 9, l0, 11 provided in the apparatus are driven by a motor, not shown.
  • the feeding belt 6 conducts, at its discharge end, the heterogeneous particle mixture into the effective zone of a spiked roll 12.
  • the roll 12 is driven independently at a suitable speed.
  • the spiked roll 12 cooperates with the feeding belt 6 so that a uniform and constant feeding of the particles in opened-up form to the distributing chamber 1 is obtained, and the discharge of adhering clumps of particles is prevented.
  • the feeding device for the particles also comprises a pair of pivotable deflectors 13 arranged at a mutual spacing.
  • deflectors 13 are pivoted, via a linkage 14 by an eccentric drive 15 during the production of a fleece at a relatively high speed in a pendulating fashion, so that they execute, for example, 50 oscillations per minute, and the introduction of particles into the distributing chamber 1 is accomplished so that a uniform distrubtion is attained in the chamber.
  • the spreading of the fleece on the conveyor belt takes place, in the apparatus illustrated in FIG. 1, during the movement of the distributing chamber in FIG. 1 in one direction, whereas during the return movement the feeding and distribution of the chips are interrupted. This does not mean that the distributing chamber must be moved to practice the invention. It is also contemplated to arrange the distributing chamber to be stationary, if the fleece carrier is moved.
  • each group 16, 17 includes several spaced-apart registers. Other preferred embodiments are contemplated without an interspace between the register groups.
  • Both register groups are suspended at the upper wall of the distributing chamber 1 in a suitable manner.
  • the vertical end faces of the individual registers are provided with a number of air outlet openings 18.
  • the registers of the register group 16 are in communication with a distributing conduit 20 via an air feed pipe 19.
  • the conduit 20 is connected with a housing 21 for a blower 22, taking in air through a conduit 23 from the right-hand end of the distributing chamber 1.
  • pipes 24 connect the upper ends of the register group 17 with a distributing conduit 25 associated'with a housing 26 for a blower 27, taking in air through a conduit 28 from the left-hand end of the distributing chamber 1.
  • valves 29 and 30, respectively the air conveying conditions for each individual register can be set.
  • the upper air conducting ducts 36 extend horizontally
  • the lower air conducting ducts 37 of both register groups are disposed to be inclined downwardly with respect to the horizontal, namely with increasing inclination the closer the air outlet openings of the ducts are to the fleece carrier 4.
  • the air register groups 16 and 17 of FIG. 1 are replaced by register groups 38 and 39, each of which consists of registers arranged at spacings to one another in a side-by-side relationship. The minimum spacing of these registers from one another corresponds to the width of one register in these embodiments.
  • the registers of the two register groups 38, 39 have a different structure than the registers shown in FIG. 1.
  • Each individual register group 38, 39 contains upper and lower groups or regions or ducts having a preferably rectangular cross section, to which air is fed via air feed pipes 19', 19" and 24, 24", respectively.
  • the outlet openings 40 and 41 of group 42 and 43, respectively, of the ducts of the individual registers face the plane of symmetry 44 between the two register groups 38, 39 and blow air streams between adjacent registers of the opposed register group, so that glue-covered superfine and a portion of fine components falling from above are moved into opposite directions and classified.
  • the other group 45 and 46, respectively, of ducts of each individual register terminates in outlet openings 47 and 48 disposed in the lower range of each individual register.
  • the air streams emanating from openings 7 and 48 move in opposite directions away from the plane of symmetry 44. These air streams from openings 47 and 48 thus increase the classifying effect for the particles which are screened by the upwardly exiting air streams from openings 40 and 41.
  • the number of ducts or outlet openings 40 and 41 in the upper region and/or outlet openings 47 and 48 in the lower region of the registers of the registergroups which are provided depends on the respective requirement.
  • preferred embodiments include plates such as sheet metal plates for closing off respective ones of the upper outlet openings 40, 41 and lower outlet openings.
  • baffles 49 and 50 are arranged respectively underneath the ducts 42 and 43 (FIG. 2).
  • the width of these baffles 49, 50 corresponds to the width of each register group.
  • the baffles 49, 50 are arranged to be at least vertically adjustable but can'also be pivotable and lockable in selectable pivotal positions according to other non-illustrated preferred embodiments. Also, preferred non-illustrated embodiments using multipartite baffles in place of the single baffles 49, 50 are contemplated.
  • the objective attained by these baffles is that particles entering the space defined by the baffles are fed to the conveyor belt 4 ofthe central layer material without being further classified.
  • baffles 51 and 52 are provided between the respective spacedapart adjacent registers of the two register groups.
  • baffles 51, 52 are located approximately in the center of the height of the registers. and their lower ends rest on respective transverse plates 53 and 54. Plates 53, 54 extending over the entire width of the register groups and are arranged in the lower zone so that they form a slot 55 which is extended in the downward direction by feeding surfaces 56 and 57.
  • the baffles 51 and 52 are preferably guided with respect to either the registers between which they are located or by the transverse plates 53 and 54.
  • the baffles 51, 52 are arranged to be displaceable and/or adjustable in order to place them into optimum vertical positions corresponding to the thickness of board to be manufactured from the mixture supplied to carrier 4.
  • Extension pieces 58 and 59 can be arranged at each of the respective baffles 51 and 52.
  • An adjustable mounting is also preferable for these extensions, permitting particularly a pivoting and locking in a selected position.
  • the guide surfaces 56, 57 can also be constructed to be pivotable and adjustable; and lockable into position, especially in a releasable arrangement, with respect to other points of the system.
  • the dash line extensions of plates 53 and 54 indicate that these plates can be adjustably displaced outwardly in the upward direction in order to change the size of chute or funnel 60.
  • the spiked rolls 6], 62 which can be reciprocated oscillatingly in the direction of their axes of rotation can also be replaced by other means, for example by a plurality of hinged flaps, similar to the hinged flaps 13, but with pivoting axes extending in parallel to the traveling direction of the fleece carrier or the spreading station.
  • composition of the particle mixture to be classified by the present invention is as follows:
  • 8-15 percent superfine particles passes through mesh width of 0.315 mm. 8-15 percent fine particles passes through mesh width of 1 mm.
  • the proportion of material which is passed through the lower group of registers without further classification can be controlled with the apparatus of the present invention to suit the particular board width and composition to be manufactured by appropriate control of the air flow in the upper and lower registers, the spacing of the registers from the centerline of the particle flow path, and the adjustment of baffles 49, 50, 51, 52 and plates 53, 54.
  • particle supply means spaced vertically from said particle carrier and including means for supplying a heterogeneous mixture of superfine, fine and coarser particles to said particle carrier such that said mixture falls downwardly towards said particle carrier with a particle path centerline extending downwardly from said particle supply means to said particle carrier;
  • upper particle classifying means disposed between said particle supply means and said particle carrier and including a plurality of upper conduit means at each of opposite lateral sides of the path centerline, the upper conduit means at one side of the path centerline having upper outlet openings which face corresponding upper outlet openings of the upper conduit means at the other side of the path centerline, said upper outlet openings being spaced from one another in a direction transverse to said path centerline to permit passage therebetween of portions of said mixture while gas under pressure is discharged from said upper outlet openings to effect a classification of the particles with the superfine and fine particles spaced further from the path centerline than the coarser particles;
  • lower particle classifying means disposed between said upper particle classifying means and said particle carrier and including a plurality of lower conduit means at each of said opposite lateral sides of the path centerline, the lower conduit means at one side of the path centerline having lower outlet openings facing in one direction away from the path centerline and the lower conduit means at the other side of the path centerline having lower out let openings facing in an opposite direction away from the path centerline, said lower outlet openings at the one side of said centerline path being spaced from the lower outlet openings at the other side of the centerline path to form a space therebetween for the passage therethrough of a portion of the particle mixture without further classification by said lower particle classifying means while other portions of the particle mixture pass outwardly of said lower outlet openings and are further classified by gas under pressure exiting from said lower outlet openings, whereby boards can be constructed with that portion of the particle mixture which is classified only by the upper classifying means forming central board sections and that portion of the particle mixture which is classified by both the upper and lower classifying means forming edge board sections.
  • baffle means are disposed at respective opposite sides of the space formed between the lower outlet openings for adjusting the flow of gas in said space and for guiding that portion of said particle mixture passing through said space.
  • baffle means include vertically adjustable baffle plates at each of the respective opposite sides of said space.
  • Apparatus according to claim 6, further comprising a distributing chamber for housing said classifying means, wherein said upper and lower outlet openings are substantially uniformly distributed across the width of said distributing chamber with said outlet openings arranged in a mirror image-relationship at opposite sides of a centerplane through which said path centerline extends.
  • said baffle means includes a pair of transverse plates extending across the width of said distributing chambers at respective opposite sides of said centerplane, baffle plates arranged respectively in substantially the same planes as said transverse plates, and means for accommodating displacement of said baffle plates with respect to the associated transverse plates.
  • baffle plates extend between respective vertical rows of said lower conduit means.
  • Apparatus according to claim 12 further comprising a pair of driven and reciprocated spiked rolls positioned below a chute formed by said transverse plates for assisting in uniformly spreading that portion of the particle mixture passing between said lower outlet openings.
  • conduit means includes register groups having ducts connecting the source of pressurized gas to each of respective ones of said outlet openings.
  • conduit means includes register groups having ducts connecting a source of pressurized air to each of respective ones of said outlet openings.
  • Apparatus according to claim 15 wherein the ducts connected with said lower outlet openings are oriented obliquely downwardly toward said particle carrier in a direction away from said particle path centerline.
  • said baffle means includes baffle plates and extension pieces connected at the lower ends of said baffle plates, said extension pieces forming a guide chute for directing that portion of said particle mixture passing through said space onto said particle carrier.
  • each of said extension pieces are adjustable with respect to respective ones of said baffle plates connected thereto.
  • Apparatus according to claim 20 further comprising a distributing chamber for housing said classifying means, wherein said upper and lower outlet openings are substantially uniformly distributed across the width of said distributing chamber with said outlet openings arranged in a mirror image-relationship at opposite sides of a centerplane through which said path centerline extends.
  • Apparatus according to claim 19 further comprising a pair of driven and reciprocated spiked rolls positioned below a chute formed by said transverse plates for assisting in uniformly spreading that portion of the particle mixture passing between said lower outlet openings.
  • said roll driving means includes means for rotating said spiked rolls such that, as viewed in the direction of the axes of rotation of said spiked rolls, the left most spiked roll rotates counterclockwise and the right most spiked roll rotates clockwise, with a consequent outward dispersion of said particles with respect to said particle path centerline.
  • particle supply means spaced vertically from said particle carrier and including means for supplying a mixture of particles to said particle carrier such that said mixture falls downwardly towards said particle carrier with a particle path centerline extending downwardly from said particle supply means to said particle carrier;
  • upper particle classifying means disposed between said particle supply means and said particle carrier and including at least one upper conduit means at each of opposite lateral sides of the path centerline, the upper conduit means at one side of the path centerline having at least one upper outlet opening which faces a corresponding at least one upper outlet opening of the upper conduit means at the other side of the path centerline, said upper outlet openings being spaced from one another in a direction transverse to said path centerline to permit passage thereby of portions of said mixture while gas under pressure is discharged from said upper outlet openings to effect a classification of the particles with the finer particles spaced further from the path centerline than the coarser particles;
  • lower particle classifying means disposed between said upper particle classifying means and said particle carrier and including at least one lower conduit means at each of said opposite lateral sides of the path centerline, the lower conduit means at one side of the path centerline having at least one lower outlet opening facing in one direction away from the path centerline and the lower conduit means at the other side of the path centerline having at least one lower outlet opening'facing in an opposite direction away from the path centerline, said at least one lower outlet opening at the one side of said centerline path being spaced from the at least one lower outlet opening at the other side of the centerline path to form a space therebetween for the passage therethrough of a portion of the particle mixture without further classification by said lower particle classifying means while other portions of the particle mixture pass outwardly of said lower outlet openings and are further classified by gas under pressure exiting from said lower outlet openings, whereby boards can be constructed with that portion of the particle mixture which is classified only by the upper classifying means forming central board sections and that portion of the particle mixture which is classified by both the upper and lower classifying means forming edge board
  • baffle means are disposed at respective opposite sides of the space formed between the lower outlet openings for adjusting the flow of gas in said space and for guiding that portion of said particle mixture passing through said space.
  • conduit means includes register groups having ducts connecting the source of pressurized gas to each of respective ones of said outlet openings.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
US413424A 1972-11-07 1973-11-07 Apparatus for spreading material serving for the manufacture of fiberboards Expired - Lifetime US3897185A (en)

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DE2254501A DE2254501C2 (de) 1972-11-07 1972-11-07 Vorrichtung zum Streuen der dem Herstellen von Spanplatten dienenden Späne

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IT (1) IT994429B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (36)

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US4971540A (en) * 1987-12-22 1990-11-20 Compak Systems Limited Apparatus for laying a mat of fibrous material
US20100092731A1 (en) * 2008-04-07 2010-04-15 Valinge Innovation Belgium Bvba Wood fibre based panels with a thin surface layer
US20100291397A1 (en) * 2007-11-19 2010-11-18 Valinge Innovation Belgium Bvba Recycling of laminate floorings
US20100300030A1 (en) * 2007-11-19 2010-12-02 Valinge Innovation Belgium Bvba Fibre based panels with a wear resistance surface
US20100323187A1 (en) * 2009-06-17 2010-12-23 Flooring Technologies Ltd. Panel, Use of a Panel, Method for Manufacturing a Panel and a Prepreg
US20110177354A1 (en) * 2010-01-15 2011-07-21 Valinge Innovation Belgium Bvba Bright coloured surface layer
US20110175251A1 (en) * 2010-01-15 2011-07-21 Välinge Innovation Belgium BVBA Fibre based panels with a decorative wear resistance surface
US20110177319A1 (en) * 2010-01-15 2011-07-21 Valinge Innovation Belgium Bvba Heat and pressure generated design
US20110189448A1 (en) * 2010-01-15 2011-08-04 Valinge Innovation Belgium Bvba Fibre based panels with a decorative wear resistance surface
US8480841B2 (en) 2010-04-13 2013-07-09 Ceralog Innovation Belgium BVBA Powder overlay
US8728564B2 (en) 2011-04-12 2014-05-20 Valinge Innovation Ab Powder mix and a method for producing a building panel
US8920876B2 (en) 2012-03-19 2014-12-30 Valinge Innovation Ab Method for producing a building panel
US8993049B2 (en) 2012-08-09 2015-03-31 Valinge Flooring Technology Ab Single layer scattering of powder surfaces
US9085905B2 (en) 2011-04-12 2015-07-21 Valinge Innovation Ab Powder based balancing layer
US9181698B2 (en) 2013-01-11 2015-11-10 Valinge Innovation Ab Method of producing a building panel and a building panel
US9352499B2 (en) 2011-04-12 2016-05-31 Valinge Innovation Ab Method of manufacturing a layer
US9556622B2 (en) 2007-11-19 2017-01-31 Valinge Innovation Ab Fibre based panels with a wear resistance surface
US9573343B2 (en) 2014-03-31 2017-02-21 Ceraloc Innovation Ab Composite boards and panels
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US10100535B2 (en) 2014-01-10 2018-10-16 Valinge Innovation Ab Wood fibre based panel with a surface layer
US10286633B2 (en) 2014-05-12 2019-05-14 Valinge Innovation Ab Method of producing a veneered element and such a veneered element
US10315219B2 (en) 2010-05-31 2019-06-11 Valinge Innovation Ab Method of manufacturing a panel
US10442164B2 (en) 2013-11-27 2019-10-15 Valinge Innovation Ab Floor, wall, or ceiling panel and method for producing same
US10442152B2 (en) 2013-11-27 2019-10-15 Valinge Innovation Ab Floorboard
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US10828881B2 (en) 2016-04-25 2020-11-10 Valinge Innovation Ab Veneered element and method of producing such a veneered element
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US10981362B2 (en) 2018-01-11 2021-04-20 Valinge Innovation Ab Method to produce a veneered element
US11046063B2 (en) 2011-04-12 2021-06-29 Valinge Innovation Ab Powder based balancing layer
US11072156B2 (en) 2013-11-27 2021-07-27 Valinge Innovation Ab Method for producing a floorboard
US11167533B2 (en) 2018-01-11 2021-11-09 Valinge Innovation Ab Method to produce a veneered element and a veneered element
US11235565B2 (en) 2008-04-07 2022-02-01 Valinge Innovation Ab Wood fibre based panels with a thin surface layer
US11313123B2 (en) 2015-06-16 2022-04-26 Valinge Innovation Ab Method of forming a building panel or surface element and such a building panel and surface element
US11597187B2 (en) 2019-01-09 2023-03-07 Valinge Innovation Ab Method to produce a veneer element and a veneer element
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DE2847109C3 (de) * 1978-10-30 1981-09-17 Bison-Werke Bähre & Greten GmbH & Co KG, 3257 Springe Vorrichtung zum Streuen eines Vlieses

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Cited By (77)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4971540A (en) * 1987-12-22 1990-11-20 Compak Systems Limited Apparatus for laying a mat of fibrous material
US9783996B2 (en) 2007-11-19 2017-10-10 Valinge Innovation Ab Fibre based panels with a wear resistance surface
US20100291397A1 (en) * 2007-11-19 2010-11-18 Valinge Innovation Belgium Bvba Recycling of laminate floorings
US20100300030A1 (en) * 2007-11-19 2010-12-02 Valinge Innovation Belgium Bvba Fibre based panels with a wear resistance surface
US9556622B2 (en) 2007-11-19 2017-01-31 Valinge Innovation Ab Fibre based panels with a wear resistance surface
US8617439B2 (en) 2007-11-19 2013-12-31 Valinge Innovation Ab Recycling of laminate floorings
US8349235B2 (en) 2007-11-19 2013-01-08 Ceraloc Innovation Belgium Bvba Recycling of laminate floorings
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DE2254501A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1974-01-31
DE2254501B1 (de) 1974-01-31
IT994429B (it) 1975-10-20

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