EP0341250B1 - Vorrichtung und verfahren zum anbringen eines klebemittels und verfahren zur herstellung eines wiederhergestellten holzerzeugnisses - Google Patents

Vorrichtung und verfahren zum anbringen eines klebemittels und verfahren zur herstellung eines wiederhergestellten holzerzeugnisses Download PDF

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Publication number
EP0341250B1
EP0341250B1 EP88900559A EP88900559A EP0341250B1 EP 0341250 B1 EP0341250 B1 EP 0341250B1 EP 88900559 A EP88900559 A EP 88900559A EP 88900559 A EP88900559 A EP 88900559A EP 0341250 B1 EP0341250 B1 EP 0341250B1
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EP
European Patent Office
Prior art keywords
applying
rollers
pair
web
bonding agent
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EP88900559A
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English (en)
French (fr)
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EP0341250A1 (de
EP0341250A4 (de
Inventor
Robin David Sealey
Maxwell George Campbell
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South Australian Timber Corp
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South Australian Timber Corp
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Priority to AT88900559T priority Critical patent/ATE103532T1/de
Publication of EP0341250A1 publication Critical patent/EP0341250A1/de
Publication of EP0341250A4 publication Critical patent/EP0341250A4/de
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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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent

Definitions

  • This invention relates to a process and apparatus for applying bonding agent and to a process for forming a reconsolidated wood product as well as to a reconsolidated wood product formed by the latter process.
  • Australian Patent Specification 510,845 describes a reconsolidated wood product formed from at least one flexible open lattice work web of naturally interconnected wood strands generally aligned along a common grain direction, a substantial proportion of the strands being substantially discrete but incompletely separated from each other,and the web having been consolidated by compression whilst substantially maintaining the wood strands aligned along the common grain direction and the strands being bonded together to hold them in juxtapositions assumed pursuant to the consolidation.
  • That patent specification also describes a process for forming a reconsolidated wood product from a flexible open lattice work web of naturally interconnected wood strands, the web being formed by partially rending natural wood so that the strands are generally aligned along a common grain direction, a substantial proportion of the strands being substantially discrete but incompletely separated from each other, and the process comprising compressing the web to consolidate the strands whilst maintaining them such as to substantially extend in the original grain direction and bonding the strands together to hold them in juxtapositions assumed pursuant to the consolidation.
  • Patent Specification WO 85/02368 proposes coating the aforementioned webs with bonding agent on a continuous or semi-continuous basis by applying bonding agent to the or each web prior to its passage through a pair of applying rollers and removing excess bonding agent from the web downstream of said applying roller pair and, in a process for forming a reconsolidated wood product, superposing the webs, compressing the superposed webs to consolidate the strands and using the bonding agent to bond the strands and webs together.
  • Patent Specification WO 85/02368 also proposes apparatus for applying bonding agent to the aforementioned webs on a continuous or semi-continuous basis, comprising a pair of applying rollers adapted to receive the web therethrough, means for supplying bonding agent for impregnation by passage of the web through the applying roller pair and a pair of squeeze rollers for removing excess bonding agent from the web.
  • a process for applying bonding agent to a flexible open lattice work web of naturally interconnected wood strands as described herein with reference to WO 85/02368 wherein at least one roller of the pair of applying rollers is corrugated whereby a portion of the web passing through the applying rollers at any one time is spread laterally without substantial further separation of the strands and in that the bonding agent is applied to said portion of the web immediately prior to said portion being spread or while said portion is spread by the pair of applying rollers.
  • apparatus for applying bonding agent to a flexible open lattice work web of naturally interconnected wood strands as described herein with reference to WO 85/02368 wherein at least one of the rollers of said applying roller pair has a corrugated outer surface whereby to define an extended path for the web across the width thereof and to thereby open the web.
  • the lattice of the web is resiliently opened up as the web passes through the applying roller pair due to the increased lateral path defined by the or each corrugated roller, that is the increased surface length of the roller in the axial direction thereof.
  • the bonding agent may accordingly more readily enter the body of the web and coat the strands. It is not necessary for the web to be substantially compressed between the nip of the applying rollers, merely that its effective surface area be increased by following the contour of the or each corrugated roller.
  • both rollers of the applying roller pair are corrugated in which case the peaks of the respective rollers should be offset, and may intermesh, to define a sinuous path between the applying rollers which is of greater length than the axial length of the rollers.
  • the nip between the rollers need not be substantially smaller than the depth of the web since it is important not to further break up the web by additional separation of the strands.
  • the corrugations may take any desired shape and are conveniently substantially sinusoidal or sinusoidal but with lands between the peaks (i.e. the valleys are extended).
  • the applying rollers may take any suitable form and be made of, for example, metal, rubber or plastics. Cast iron, stainless steel and aluminium are preferred metal roller materials.
  • the or each applying roller may be pneumatic, and it is preferred that, where only one of the rollers in the roller pair is corrugated, at least the other is pneumatic.
  • a second pair of applying rollers incorporating any one or more of the aforementioned features may be provided upstream or downstream of the first mentioned pair to facilitate infiltration of the bonding agent to the lattice work.
  • the spacing between the two pairs of applying rollers may be minimal, for example in the range of 25-100 mm or less, preferably towards the lower end of the range.
  • a support roller or other support means may be provided between the two pairs of applying rollers.
  • the nip between the rollers of the two pairs of applying rollers may be substantially the same, but most advantageously the nip between the downstream pair of applying rollers is slightly smaller than that between the upstream pair.
  • the apices of the peaks of the upstream pair of applying rollers lie in a common plane in the nip, while the apices of the peaks of the downstream pair of applying rollers intermesh in the nip.
  • the or each pair of applying rollers may be driven or non-driven, or one of the two pairs may be driven. If none of the applying rollers is driven it will be necessary to provide other means for displacing the web therethrough.
  • a pair of cylindrical drive rollers is provided upstream of the one pair or both pairs of applying rollers whether or not the applying rollers are driven, and support means for example in the form of a single roller may be provided to guide the web from the drive rollers into the nip of the one pair or upstream pair of applying rollers.
  • the means for removing excess bonding agent from the web may take any suitable form, but as indicated hereinbefore preferably comprises a pair of squeeze rollers which are conveniently formed of rubber or are pneumatic. Such squeeze rollers are preferably plain rollers and may be mounted in a floating manner.
  • the combination of at least one corrugated applying roller and the squeeze rollers is adapted to successively compress and relax the web primarily or substantially in the direction of the depth thereof and to permanently increase the width of the web without breaking the lattice-continuity. It has been found that deforming the web by means of the at least one corrugated applying roller such as to increase the width of the web in the range 15 to 35%, preferably about 25% is satisfactory for webs formed from young Pinus radiata trees.
  • a support roller or other carrier means may be provided between the one applying roller pair or the downstream applying roller pair and the means for removing excess bonding agent.
  • Such carrier means and the aforementioned other optional support means are all intended to prevent small separated strands or splinters from separating from the web, but where they are in the form of rollers, and particularly if the bonding agent is applied as a foam, they may also serve the function of assisting to return excess bonding agent to a position upstream of the one pair or the upstream pair of applying rollers for re-use.
  • a shroud at least beneath the one pair or each pair of applying rollers may be provided to assist the return of the excess bonding agent to a position upstream of the applying rollers, although excess bonding agent may also be carried back over the top of the applying rollers by the rotating action thereof.
  • the bonding agent may be of any suitable type that can be readily infiltrated into the web.
  • a resin agent such as tannin may be dissolved in water and applied as a liquid either by immersion, or by flow through a curtain, or sprayed with air under pressure, or the liquid may be foamed with air or other gas and the foam infiltrated into the scrim web.
  • the bonding agent may be metered onto the web on either or both major surfaces upstream of the or each corrugated roller pair where it is carried forward into the nip of the rollers and worked into the scrim web.
  • the bonding agent may be applied to the applying rollers and be carried by them into contact with the scrim web.
  • the bonding agent may be applied to a bath between the one pair or the downstream pair of applying rollers and the means for removing excess bonding agent, and be carried upstream by the rotating action of the applying rollers.
  • the foam When the bonding agent solution (or emulsion) is applied as a foam, the foam may have a density of the order of 100 g/litre. However, the process has been operated satisfactorily with a foam density in the range 30 g/l to 160 g/l and heavier densities may be considered for specific applications. Foam density controls the pick up of resin and moisture if it is a solution. It is also anticipated that foamed liquid resins may be used neat.
  • Compression and consolidation of the web for example by curing the bonding agent while the web is compressed on a non-, semi- or fully- continuous basis, occurs downstream of the application of bonding agent. Two or more of the webs may be superposed prior to compression and consolidation.
  • a plurality of webs 14 are assembled together, such as by laying them one over the other in a suitable mould 18.
  • the assemblage of overlaid webs 14 is then compressed in mould 18 such as by compression between the base of the mould and an upper press element 20 as shown, and the adhesive is cured, to form the final product 22.
  • Product 22 is characterised in that it comprises a plurality of wood strands which remain naturally interconnected and which extend generally in the original grain direction of the wood.
  • the strands are bonded together by the adhesive but are positioned in somewhat displaced relative locations as compared with the positions occupied in the original log 10.
  • the product 22 has been found to be particularly satisfactory as it possesses good mechanical properties, due to the relatively small degradation of the original wood structure which is caused by the process, as well as good nailability and a generally pleasing appearance.
  • FIG. 1 The process immediately before described is a batch type process and Figures 2 to 4 illustrate schematically two embodiments of apparatus for applying bonding agent to one or more webs 14 by a semi-continuous or continuous process in accordance with the present invention.
  • apparatus 24 comprises a first pair of applying rollers 26 and a second pair of rollers 28 each mounted for rotation about an axis transverse to the direction of displacement of the web 14 through the applying rollers, shown by the arrow 30.
  • the rollers 26 and 28 may each be driven or non driven and in the preferred apparatus, all of the applying rollers are driven to feed the web through the apparatus 24.
  • the rollers may be mounted in a suitable frame or bath which for convenience has not been shown.
  • Each of the rollers 26 and 28 has the form shown in Figure 4, that is with a semi-sinusoidal outer periphery with peaks 32 interspaced by lands 34, and the peaks of each of the pairs of rollers 26 and 28 are offset so as to define a sinuous path between the rollers of each pair, that is with the peaks 32 of one roller of each pair overlying the lands 34 of the other roller in that pair.
  • Each of the rollers has a keyed spindle 36 extending from each end of the roller body and is preferably formed in steel or cast iron.
  • the roller body 38 has a length of about 440 mm and the peaks 32 and lands 34 have outside diameters of about 150 and 110 mm respectively.
  • the typical length a of each land is 20 mm while the radius b of the apex 40 of each peak 32 is typically 3 mm and the angle ⁇ of each peak is typically 23°.
  • the preferred range of thicknesses or depths of the web 14 are in the range 25 to 100 mm and the preferred minimum nip (i.e.. between the planes of the peaks) between the rollers of each pair 26 and 28 is in the range 0 to 20 mm with the nip between the first pair of rollers 26 being advantageously slightly greater than the nip between the second pair of rollers 28.
  • the depth of the peaks 32 may be in the range 15 to 25 mm and it will be appreciated that the rollers of each pair 26 and 28 may intermesh to a small degree.
  • rollers 28 do intermesh. Accordingly, there may be only a small degree of compression of the web 14 between either of the pairs of rollers 26 and 28 but the web 14 is stretched laterally, along the length of the rollers, by following the sinuous path defined by the nips so as to open up the lattice work of the discrete but not completely separated strands of the web 14.
  • the means 42 is illustrated schematically and comprises respective foraminous tubes 44 disposed above and below the web and supplied with liquid bonding agent such as a tannin solution from a reservoir (not shown) through a metering device (not shown) and pipes 46.
  • the tubes 44 are closed at each end and have a series of holes 49, such as shown in the lower tube 44 in Figure 2, opening towards the web 14.
  • the application device 42 may be modified to discharge foam or vaporized bonding agent onto the web 14.
  • the bonding agent is thus applied to the web 14 as or immediately before the lattice work of the web is opened up by the roller pair 26, such opening up permitting the bonding agent to infiltrate the lattice work.
  • a sufficient infiltration may occur with just the roller pair 26, but the roller pair 28 may be provided, for example 25 mm downstream of the roller pair 26 to enhance the infiltration in much the same manner as the roller pair 26.
  • the successive pairs of rollers 26 and 28 may have their peaks in line but preferably to ensure optimum displacement of the strands of the web they are relatively displaced so that the peaks of the second roller pair are opposite the valleys of the first roller pair.
  • a pair of squeeze rollers 48 is mounted for rotation parallel to the rollers 26 and 28 to receive the web 14 as it is discharged from the second pair of rollers 28.
  • the rollers 48 are shown schematically but preferably have a rubber or pneumatic body 50 which may be plain or gently corrugated. The rollers 48 should compress the web 14 without substantially breaking the interconnections between the strands of the web so as to squeeze excess bonding agent from the web.
  • the bonding agent may be applied between the first and second pairs of rollers 26 and 28 so that the bonding agent is applied to the open lattice work.
  • the bonding agent is in the form of a foam, for example a tannin solution which is foamed with a suitable activator
  • bonding agent applied downstream of the roller pair 26, or even downstream of both roller pairs 26 and 28 is carried upstream by the rotating surfaces of the rollers so as to also be applied to the web upstream of the first roller pair 26.
  • the bonding agent may be applied directly to the web 14 between the second pair of rollers 28 and the squeeze rollers 48.
  • the rollers 26, 28 and 48 are disposed in a bath to contain the bonding agent.
  • the apparatus 100 for applying bonding agent in much the same way as the apparatus 24 of Figure 2 includes two spaced pairs 102 and 104 of applying rollers which are each driven and are identical to the rollers described with reference to Figure 4 so including peaks 32 and lands 34.
  • the rollers are supported for rotation about respective axes 36 and the axes of each pair 102 and 104 are vertically spaced.
  • the peaks 32 of the roller pair 102 project into a common plane at the nip 106 so do not intermesh while the peaks of roller pair 104 do intermesh slightly as shown at the nip 108.
  • the peaks 32 of the applying rollers in each pair are offset one relative to the other and the peaks of the rollers 102 are offset relative to the peaks of the rollers 104.
  • the bottom rollers in each pair 102 and 104 rotate in a clockwise direction while the top rollers in each pair 102 and 104 rotate in an anti-clockwise direction so as to displace a web through the nips 106 and 108 from left to right in the drawing.
  • a pair of drive rollers 110 Upstream of the roller pair 102 is a pair of drive rollers 110 which are plain and supported for rotation about axis 112 to define a nip 114 which lies in a common plane with the nips 106 and 108.
  • the drive rollers 110 are driven to rotate in the same respective directions as the roller pairs 102 and 104 and are intended to force the web into the nip 106.
  • a support roller 116 for rotation about an axis parallel to the axes 36 and 112 but below the plane of the nips 114, 106 and 108.
  • the support roller 116 is spaced from the lower drive roller 110 and the lower applying roller 102 by approximately 5 mm and may have a diameter in the range of for example 50 to 70 mm.
  • the primary purpose of the support roller 116 is to prevent small separated strands from dropping out of the web between the roller pairs but it has a secondary function which will be described in due course.
  • a pair of squeeze rollers 118 Downstream of the applying roller pair 104 is a pair of squeeze rollers 118 which are also driven to rotate about respective axes 120 parallel to the axes 36 and 112 so that the nip 122 lies in the common plane of the nips 106, 108 and 114.
  • the squeeze rollers 118 are also driven to rotate in the same respective directions as the applying rollers and the drive rollers and may otherwise be identical to the squeeze rollers 48 so will not be described further.
  • a second support roller 124 is mounted for rotation about an axis parallel to the other described axes and below the plane of the nips.
  • the support roller 124 may have a diameter in the range 50 to 70 mm and is shown spaced from the bottom squeeze roller 118 by about 5 mm while almost touching the lower applying roller 104.
  • the primary function of the support roller 124 is to prevent small separated strands from dropping out of the web as it passes through the apparatus 100 but it has a secondary purpose which will be described hereinafter.
  • All of the pairs of rollers 102, 104, 110 and 118 and the support rollers 116 and 124 are supported for rotation in an open ended bath 126 having a bottom 128, sides 130 (only one shown) and at least a partial downstream end 132.
  • the bath 126 is intended to contain the bonding agent, preferably in a foam form, as will be described in more detail hereinafter.
  • a conveyor belt 134 shown only in part is supported for displacement on spaced rollers 136 (one only shown) to receive the coated and spread web from the bath 126 for onward processing for example as described with reference to Figure 1.
  • the conveyor 134 is disposed within a housing 138 but this and the conveyor 134 may take any suitable form and will not be described further.
  • a third support roller 140 is supported for rotation about an axis parallel to the other described axes between the lower squeeze roller and the adjacent conveyor roller 136. The purpose of the third support roller 140 is also to prevent small separated strands from dropping out of the coated and spread web.
  • the bath 126 is primarily intended to take foam bonding agent which may be as previously described and this may be introduced to the bath in a batch manner or directly onto the web within the bath immediately upstream of the applying rollers 102 or elsewhere upstream of the squeeze rollers 118.
  • the squeeze rollers 118 squeeze excess bonding agent out of the impregnated web and it is found that the excess is drawn by the anti-clockwise rotation of the upper rollers 102 and 104 over the top thereof back to upstream of the roller pair 102 where its return passage is blocked by a partial wall 142 extending across the bath above the plane of the nips.
  • a similar movement of the excess bonding agent is caused between the bottom rollers 102 and 104 and the base 128 of the bath 126 and the return passage of this portion of the excess bonding agent is prevented by a partial wall 144 extending across the width of the bath between the base 128 and the first support roller 116.
  • a well 146 in the base 128 of the bath allows a greater volume of bonding agent to be accommodated beneath the rollers 102 and 104.
  • a shroud 148 which extends across the width of the bath from immediately adjacent the first support roller 116, beneath and partly around the bottom applying roller 102 to between the bottom rollers 102 and 104, beneath and partly around the bottom roller 104 to adjacent the second support roller 124 and the bottom squeeze roller 118.
  • the shroud 148 extends in close proximity to the lower arcs of the bottom rollers 102 and 104 but excess bonding agent is carried adjacent the shroud between the peaks 32 of the bottom applying rollers.
  • a flared lip 150 defines a funnel to receive excess bonding agent from between the second support roller 124 and the bottom squeeze roller 118.
  • roller pairs 102 and 104 are shown relatively closely spaced and in practice this spacing may be of the order of 25 mm. In a modification, the roller pairs 102 and 104 may be spaced by a rather greater distance such as the spacing between the drive rollers 110 and the applying rollers 102 and a similar support roller may be disposed between the bottom rollers 102 and 104.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Claims (37)

  1. Verfahren zum Aufbringen von Klebemittel (16) auf eine flexible offene Netzwerkbahn (14) aus natürlich miteinander verbundenen Holzfasern vor Komprimieren und Verfestigen der Bahn (14), so daß ein wiederverfestigtes Holzprodukt (22) gebildet wird, wobei die Bahn (14) gebildet wird, indem natürliches Holz (10) teilweise gerissen wird, so daß die Fasern allgemein entlang einer gemeinsamen Faserungsrichtung angeordnet werden, wobei ein wesentlicher Anteil der Fasern im wesentlichen diskret, aber unvollständig voneinander getrennt sind, Aufbringen von Klebemittel (16) auf die Bahn (14) vor ihrem Durchgang durch ein Paar Auftragsrollen (26, 102) und Entfernen von überschüssigem Klebemittel von der Bahn (14) unterhalb des Auftragsrollenpaars (26, 102), dadurch gekennzeichnet, daß mindestens eine Rolle (26, 102) des Paares von Auftragsrollen gerippt ist, wodurch ein Teil der durch die Auftragsrollen (26, 102) durchlaufenden Bahn (14) zu jeder Zeit seitlich ausgebreitet wird, ohne wesentliche weitere Trennung der Fasern und daß das Klebemittel (16) auf den Teil der Bahn (14) unmittelbar vor dem Teil, der ausgebreitet wird, oder während der Teil durch das Paar Auftragsrollen (26, 102) ausgebreitet wird, aufgebracht wird.
  2. Verfahren nach Anspruch 1, worin beide Rollen (26, 102) des Auftragsrollenpaars gerippt sind und die Erhebungen (32) der entsprechenden Rollen (26, 102) abgesetzt sind.
  3. Verfahren nach Anspruch 1 oder 2, worin mindestens eine der Auftragsrollen (26, 102) pneumatisch ist.
  4. Verfahren nach einem der Ansprüche 1 bis 3, worin die oder jede gerippte Rolle (26, 102) des Auftragsrollenpaars im wesentlichen sinusförmige Erhebungen (32) mit Feldern (34) zwischen den Erhebungen aufweist.
  5. Verfahren nach einem der vorhergehenden Ansprüche, worin ein zweites Paar Auftragsrollen (28, 104) oberhalb oder unterhalb des erstgenannten Auftragsrollenpaars (26, 102) vorgesehen ist.
  6. Verfahren nach Anspruch 5, worin mindestens eine Rolle (28, 104) des zweiten Paars Auftragsrollen gerippt ist.
  7. Verfahren nach Anspruch 6, worin die Erhebungen (32) der mindestens einen Rolle (28, 104) des zweiten Paars Auftragsrollen von den Erhebungen (32) der mindestens einen Rolle (26, 102) des erstgenannten Paars abgesetzt sind.
  8. Verfahren nach einem der Ansprüche 5 bis 7, worin der Quetschspalt (108) des zweiten Paars (28, 104) Auftragsrollen geringer ist als der Quetschspalt (106) des erstgenannten Paars (26, 102).
  9. Verfahren nach Anspruch 8, worin beide Rollen (28, 104) des zweiten Paars Auftragsrollen gerippt sind und die Erhebungen (32) ineinandergreifen.
  10. Verfahren nach einem der vorhergehenden Ansprüche, worin alle Auftragsrollen (26, 28, 102, 104) angetrieben werden.
  11. Verfahren nach einem der vorhergehenden Ansprüche, worin ein Paar Antriebsrollen (110) oberhalb des Auftragsrollenpaars (102) oder des oberen Auftragsrollenpaars (102) vorgesehen ist.
  12. Verfahren nach Anspruch 11, worin eine Stützrolle (116) zwischen dem Antriebsrollenpaar (110) und dem Auftragsrollenpaar (102) oder dem oberen Auftragsrollenpaar (102) vorgesehen ist, um die Bahn (14) zwischen dem Antriebsrollenpaar (110) und dem Auftragsrollenpaar (102) oder -paaren (102, 104) zu stützen.
  13. Verfahren nach einem der vorhergehenden Ansprüche, worin überschüssiges Klebemittel von der Bahn (14) durch ein Paar Druckrollen (48, 118) entfernt wird.
  14. Verfahren nach Anspruch 13, worin die Druckrollen (48, 118) aus Gummi gebildet oder pneumatisch sind.
  15. Verfahren nach Anspruch 13 oder 14, worin eine Stützrolle (124) zwischen dem Auftragsrollenpaar (102) oder dem unteren Auftragsrollenpaar (104) und den Druckrollen (118) vorgesehen ist, um die Bahn (14) zwischen dem Auftragsrollenpaar (102) oder -paaren (102, 104) und den Druckrollen (118) zu stützen.
  16. Verfahren nach einem der vorhergehenden Ansprüche, worin mindestens das oder jedes Auftragsrollenpaar (102, 104) zur Rotation in einem Bad (126) angebracht ist.
  17. Verfahren nach Anspruch 16, worin das Klebemittel unterhalb des oder jedes Auftragsrollenpaars (102, 104) in das Bad (126) zugeführt wird und über das Auftragsrollenpaar oder -paare (102, 104) durch ihre Rotation getragen wird.
  18. Verfahren nach Anspruch 16 oder 17, worin mindestens eine untere Rolle (102, 104) des oder jedes Auftragsrollenpaars gerippt ist und eine Umhüllung (148) sich unmittelbar unter der oder jeder unteren Rolle (102, 104) erstreckt, um Klebemittel über die rotierenden Auftragsrollen (102, 104) zu führen.
  19. Verfahren nach einem der vorhergehenden Ansprüche, worin das Klebemittel ein Schaum ist.
  20. Vorrichtung zum Auftragen von Klebemittel (16) auf eine flexible offene Netzwerkbahn (14) aus natürlich miteinander verbundenen Holzfasern gebildet, indem natürliches Holz (10) teilweise gerissen wird, so daß die Fasern allgemein entlang einer gemeinsamen Faserungsrichtung angeordnet sind, wobei ein wesentlicher Anteil der Fasern im wesentlichen diskret, aber unvollständig voneinander getrennt sind, wobei die Vorrichtung ein Paar Auftragsrollen (26, 102), die geeignet sind, die Bahn (14) dadurch aufzunehmen, Mittel (42) zur Zufuhr von Klebemittel zum Imprägnieren, indem die Bahn (14) durch das Auftragsrollenpaar (26, 102) durchläuft, und ein Paar Druckrollen (48, 118) zum Entfernen überschüssigen Klebemittels von der Bahn aufweist, dadurch gekennzeichnet, daß mindestens eine der Rollen (26, 102) des Auftragsrollenpaars eine gerippte Außenfläche (38) aufweist, wodurch über deren Breite für die Bahn (14) ein verlängerter Weg definiert wird und um dadurch die Bahn (14) zu öffnen.
  21. Vorrichtung nach Anspruch 20, worin beide Rollen (26, 102) des Auftragsrollenpaars gerippt sind und die Erhebungen (32) der entsprechenden Rollen abgesetzt sind.
  22. Vorrichtung nach Anspruch 20 oder 21, worin mindestens eine der Auftragsrollen (26, 102) pneumatisch ist.
  23. Vorrichtung nach einem der Ansprüche 20 bis 22, worin die oder jede gerippte Rolle (26, 102) des Auftragsrollenpaars im wesentlichen sinusförmige Erhebungen (32) mit Feldern (34) zwischen den Erhebungen aufweist.
  24. Vorrichtung nach einem der Ansprüche 20 bis 23, worin ein zweites Paar (28, 104) Auftragsrollen oberhalb oder unterhalb des erstgenannten Auftragsrollenpaars (26, 102) vorgesehen ist.
  25. Vorrichtung nach Anspruch 24, worin mindestens eine Rolle (28, 104) des zweiten Paars Auftragsrollen gerippt ist.
  26. Vorrichtung nach Anspruch 25, worin die Erhebungen (32) der mindestens einen Rolle (28, 104) des zweiten Paars Auftragsrollen von den Erhebungen (32) der mindestens einen Rolle (26, 102) des erstgenannten Paars abgesetzt sind.
  27. Vorrichtung nach einem der Ansprüche 24 bis 26, worin der Quetschspalt (108) des zweiten Paars (104) Auftragsrollen geringer ist als der Quetschspalt (106) des erstgenannten Paars (102).
  28. Vorrichtung nach Anspruch 27, worin beide Rollen (104) des zweiten Paars Auftragsrollen gerippt sind und die Erhebungen (32) ineinandergreifen.
  29. Vorrichtung nach einem der Ansprüche 20 bis 28, worin alle Auftragsrollen (26, 28, 102, 104) angetrieben sind.
  30. Vorrichtung nach einem der Ansprüche 20 bis 29, worin ein Paar Antriebsrollen (110) oberhalb des Auftragsrollenpaars (102) oder des oberen Auftragsrollenpaars (102) vorgesehen ist.
  31. Vorrichtung nach Anspruch 30, worin eine Stützrolle (116) zwischen dem Antriebsrollenpaar (110) und dem Auftragsrollenpaar (102) oder dem oberen Auftragsrollenpaar (102) vorgesehen ist, um die Bahn (14) zwischen dem Antriebsrollenpaar (110) und dem Auftragsrollenpaar (102) oder -paaren (102, 104) zu stützen.
  32. Vorrichtung nach einem der Ansprüche 20 bis 31, worin die Druckrollen (48, 118) aus Gummi gebildet oder pneumatisch sind.
  33. Vorrichtung nach einem der Ansprüche 20 bis 32, worin eine Stützrolle (124) zwischen dem Auftragsrollenpaar (102) oder dem unteren Auftragsrollenpaar (104) und den Druckrollen (118) vorgesehen ist, um die Bahn (14) zwischen dem Auftragsrollenpaar (102) oder -paaren (102, 104) und den Druckrollen (118) zu stützen.
  34. Vorrichtung nach einem der Ansprüche 20 bis 33, worin mindestens das oder jedes Auftragsrollenpaar (102, 104) zur Rotation in einem Bad (126) angebracht ist.
  35. Vorrichtung nach Anspruch 34, worin das Klebemittel unterhalb des oder jedes Auftragsrollenpaars (26, 28, 102, 104) in das Bad (126) zugeführt wird.
  36. Vorrichtung nach Anspruch 34 ober 35, worin mindestens eine untere Rolle (26, 28, 102, 104) des oder jedes Auftragsrollenpaars gerippt ist und eine Umhüllung (148) sich unmittelbar unterhalb der oder jeder der unteren Rollen erstreckt, um Klebemittel über die rotierenden Auftragsrollen (26, 28, 102, 104) zu führen.
  37. Verfahren zum Bilden eines wiederverfestigten Holzproduktes (22) aus einer Vielzahl von übereinandergeordneten flexiblen offenen Netzwerkbahnen (14) aus natürlich miteinander verbundenen Holzfasern, wobei jede der Bahnen (14) gebildet wird, indem natürliches Holz (10) teilweise gerissen wird, so daß seine Fasern allgemein entlang einer gemeinsamen Faserungsrichtung angeordnet werden, wobei ein wesentlicher Anteil der Fasern in jeder Bahn (14) im wesentlichen diskret, aber unvollständig voneinander getrennt werden, wobei das Verfahren Auftragen von Klebemittel (16) auf die Bahnen (14), übereinander Anordnen (18) der Bahnen (14), Komprimieren (20) der übereinander angeordneten Bahnen (14) zum Verfestigen der Fasern und Härten des Klebemittels (16) zum Verbinden der Fasern und Bahnen (14) miteinander umfaßt, wobei das Auftragen von Klebemittel (16) Durchführen jeder Bahn (14) durch ein Paar Auftragsrollen (26, 102) und Auftragen von Klebemittel auf die Bahn (14) vor ihrem Durchgang durch das Paar Auftragsrollen (26, 102) und Entfernen von überschüssigem Klebemittel von der Bahn (14) unterhalb des Rollenpaars (26, 102) umfaßt, dadurch gekennzeichnet, daß mindestens eine Rolle (26, 102) des Paars Auftragsrollen gerippt ist, wodurch ein Teil der durch die Rollen durchlaufenden Bahn zu jeder Zeit seitlich ausgebreitet wird, ohne wesentliche weitere Trennung der Fasern und daß das Klebemittel (16) auf den Teil der Bahn (14) unmittelbar vor dem Teil, der ausgebreitet wird, oder während der Teil durch das Paar Auftragsrollen (26, 102) ausgebreitet wird, aufgebracht wird.
EP88900559A 1986-12-24 1987-12-22 Vorrichtung und verfahren zum anbringen eines klebemittels und verfahren zur herstellung eines wiederhergestellten holzerzeugnisses Expired - Lifetime EP0341250B1 (de)

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AT88900559T ATE103532T1 (de) 1986-12-24 1988-07-19 Vorrichtung und verfahren zum anbringen eines klebemittels und verfahren zur herstellung eines wiederhergestellten holzerzeugnisses.

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AUPH967586 1986-12-24
AU9675/86 1986-12-24

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EP0341250A1 EP0341250A1 (de) 1989-11-15
EP0341250A4 EP0341250A4 (de) 1990-04-10
EP0341250B1 true EP0341250B1 (de) 1994-03-30

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DE (1) DE3789510T2 (de)
ES (1) ES2006013A6 (de)
NZ (1) NZ223047A (de)
WO (1) WO1988004983A1 (de)
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NZ229106A (en) * 1988-05-18 1991-02-26 South Australian Timber Corp Rending timber into flexible open latticework web by crushing and laterally spreading between rollers
US7537031B2 (en) 2004-09-22 2009-05-26 Timtek Llc System and method for the manufacture of reconsolidated or reconstituted wood products
US8075735B2 (en) 2004-09-22 2011-12-13 Timtek, Llc System and method for the separation of bast fibers
CA2631424C (en) 2005-11-29 2015-06-09 Timtek Australia Pty, Ltd. System and method for the preservative treatment of engineered wood products
US7678309B2 (en) 2006-11-28 2010-03-16 Timtek, Llc System and method for the preservative treatment of engineered wood products
US20110293880A1 (en) * 2009-02-13 2011-12-01 Yanglun Yu Bamboo artificial board and producing method thereof
EP2397290A4 (de) * 2009-02-13 2012-10-17 Res Inst Wood Ind Caf Künstliche bambusplatteneinheit, herstellungsverfahren dafür und vorrichtung dafür
US9931761B2 (en) 2013-07-25 2018-04-03 Timtek, Llc Steam pressing apparatuses, systems, and methods
CN105562282B (zh) * 2015-12-14 2017-12-05 浙江金圣竹木有限公司 竹木复合板材的自动冷压流水线

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AU510845B2 (en) * 1976-04-15 1980-07-17 Commonwealth Scientific And Industrial Research Organisation Reconsolidated wood product Commonwealth Scientific and Industrial Research Organization
JPS6032578B2 (ja) * 1978-04-11 1985-07-29 タキロン株式会社 チップ模様シ−トの製造法
AU563123B2 (en) * 1983-11-23 1987-06-25 Valjul Pty Ltd Improvements in manufacture of reconsolidated wood products
ZA849190B (en) * 1983-11-23 1985-07-31 Repco Res Pty Ltd Continuous or semi-continuous process for forming reconsolidated wood product
AU562872B2 (en) * 1983-11-23 1987-06-18 Repco Limited Continuous or semi-continuous process for forming reconsolidated wood product
AU563122B2 (en) * 1983-11-23 1987-06-25 Valjul Pty Ltd Improvements in manufacture of reconsolidated wood products
AU569764B2 (en) * 1983-11-23 1988-02-18 Commonwealth Scientific And Industrial Research Organisation Two-step compression reconsolidated wood production
AU570289B2 (en) * 1983-11-23 1988-03-10 Commonwealth Scientific And Industrial Research Organisation Producing reconsolidated wood products
JPS61266203A (ja) * 1985-05-20 1986-11-25 Maruyoshi Ando Kk 配向性積層木材の製造方法

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ZA879646B (en) 1988-06-24
AU1102288A (en) 1988-07-27
ES2006013A6 (es) 1989-04-01
JPH02501724A (ja) 1990-06-14
NZ223047A (en) 1989-09-27
EP0341250A1 (de) 1989-11-15
BR8707929A (pt) 1989-10-31
WO1988004983A1 (en) 1988-07-14
EP0341250A4 (de) 1990-04-10
DE3789510T2 (de) 1994-07-14
DE3789510D1 (de) 1994-05-05
AU591022B2 (en) 1989-11-23
CA1278961C (en) 1991-01-15

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