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WO1993019910A1 - Pliage et profilage de panneaux de fibres de densite moyenne (mdf) - Google Patents

Pliage et profilage de panneaux de fibres de densite moyenne (mdf) Download PDF

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Publication number
WO1993019910A1
WO1993019910A1 PCT/GB1993/000696 GB9300696W WO9319910A1 WO 1993019910 A1 WO1993019910 A1 WO 1993019910A1 GB 9300696 W GB9300696 W GB 9300696W WO 9319910 A1 WO9319910 A1 WO 9319910A1
Authority
WO
WIPO (PCT)
Prior art keywords
mdf
ammonia
shaped
plasticised
sheet
Prior art date
Application number
PCT/GB1993/000696
Other languages
English (en)
Inventor
David Piers Ross Pratt
Richard Gordon Warren Pratt
Original Assignee
Woodform Design Ltd
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
Priority claimed from GB9207418A external-priority patent/GB2265914A/en
Application filed by Woodform Design Ltd filed Critical Woodform Design Ltd
Publication of WO1993019910A1 publication Critical patent/WO1993019910A1/fr

Links

Classifications

    • 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
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/20—Compounds of alkali metals or ammonium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/06—Softening or hardening of wood

Definitions

  • This invention relates to bending and shaping MDF (medium density fibreboard).
  • Wood is an expensive and rather intractable medium for the construction of articles, and for many years various man-made composites have been used instead, sometimes because of cost and sometimes because of the achievable properties.
  • One such material is that known as MDF, or medium density fibreboard, which has been available since the early 1970s.
  • MDF is basically wood fibres compounded together with amounts of one or more synthetic resin, often one based upon formaldehyde (usually a urea-formaldehyde resin, and sometimes advantageously a melamine-urea-formaldehyde [this type of MDF is often known as MUF, or HMR, the latter standing for high moisture resistance] , and typical such materials available under the generic name MDF are those sold by Medite, Caberboard and Silverpan, the exact details of which are not generally known.
  • the main present uses for MDF are in the manufacture of furniture and kitchen and bathroom fittings (cupboards and shelves, and so on).
  • MDF is commonly manufactured as flat sheets or boards of various thicknesses (typically from 3 mm to 25 mm) and densities, and may be supplied with a visually-attractive paper- or wood-veneer or plastics surface coating. It is a stiff, very rigid, practically inflexible material, with almost no plasticity, and unless it is provided as very thin sheets, with some limited degree of flexibility by virtue of that very _- 2 _-
  • the invention provides a method of shaping MDF in sheet form, in which the MDF is treated with ammonia so as to impregnate it therewith, causing it to become relatively plastic, the thus- plasticised MDF is then shaped as desired, and the ammonia is then allowed to dissipate, whereupon the MDF reverts to its normal, relatively unplastic, form, which it thereafter maintains.
  • the MDF may be any of those materials commonly known as MDF, including especially that known as MUF.
  • the MDF sheet shaped by the process of the invention may intrinsically be of any appropriate shape, size and thickness. As noted above, typical thicknesses for MDF range from 3 to 25 mm, and the method of the invention can successfully be applied to any of these. Moreover, perhaps slightly surprisingly the MDF sheet may already have a previously indented surface, giving it in section a shaped profile, and this will be substantially undistorted even when the sheet has thereafter been bent and shaped by the method of the invention.
  • the MDF is treated - conveniently at room temperature (around 15°C) - with _ o _
  • ammonia gaseous ammonia so as to impregnate it therewith, causing it to become relatively plastic.
  • the ammonia reacts with the MDF, and with the moisture in the MDF, in an exothermic reaction the heat from which raises the MDF's temperature 5 or 10 ⁇ C. It is believed that the reaction of the ammonia enables the cellulose molecules making the wood, as well as the wood fibres made therefrom, to release their grip one on another and on the bonding agent (typically a urea-formaldehyde resin), and so separate to allow them to be re-positioned as required while any applied bending or impressing occurs.
  • the bonding agent typically a urea-formaldehyde resin
  • the altered chemical (and physical) nature of the MDF coupled with the rise in temperature, causes the MDF to become rather more plastic - that is, able to have its shape changed by an applied force without immediately recovering its original shape when that force is removed - than in its original state.
  • the molecules/fibres re-bond in their new positions, without any distortion of the MDF.
  • the ammonia which is preferably in dry (anhydrous) gaseous form, may be applied to the MDF in a variety of ambient physical circumstances.
  • a sealed pressure chamber which may take the form of a standard autoclave, but can also be nothing more complicated than a sealed plastic bag [albeit one capable of withstanding the pressures and temperatures involved] under a slight pressure of up to 4 Bar (about 4 atmospheres).
  • the applied pressure is kept low, and is about 1 Bar (1 atmosphere).
  • the rate at which the treatment ammonia is absorbed into the MDF depends to some extent upon the moisture in the MDF, the rate being higher the wetter it is. Accordingly, ensuring that the MDF is moist will result in a shortening of the time of treatment - but as observed elsewhere too rapid an impregnation can cause surface blemishes and deformation, and care should be exercised when speeding treatment up in this way.
  • the period during which the MDF is so treated will also depend to some extent upon the density and thickness of the MDF, and upon the temperature. The higher the density and thickness the longer a treatment is required, while the higher the temperature the shorter the treatment needed. Thus, for example, a 6 mm sheet can successfully be treated for a period of 1 hour and a temperature of 15°C, while a 16 mm sheet might need a longer and/or hooter treatment - maybe for 3 hours and/or at 20 ⁇ C
  • the MDF becomes relatively plastic, and the thus-plasticised MDF is then shaped as desired.
  • the shaping may be done in any convenient manner, and may cause the MDF to have any suitable form.
  • a sheet (or part thereof) of MDF can be stamped or impressed with surface patterns so that it looks embossed, while a strip of MDF can be clamped to and bent round a former into a curve.
  • plasticised MDF sheet may be bent and shaped entirely by hand
  • one suitable bending and shaping method involves the use of a jig - that is, a pre-shaped surface or set of points around which the MDF sheet can be bent and clamped into place while it "sets".
  • a jig - that is, a pre-shaped surface or set of points around which the MDF sheet can be bent and clamped into place while it "sets”.
  • the art of jig construction and use is in general well-known, and no more need be said about it here.
  • bending or shaping is to involve a stamping or pressing operation, then this can be accomplished in any convenient way - in a conventional press, or using rotating rollers, for instance.
  • This type of shaping method is in general well-known, and needs no further comment here.
  • the degree of bending attainable without damaging the MDF depends to some considerable extent of the thickness of the MDF, thin sheets being understandably more bendable than thick ones. In tests using the method of the invention it has been possible reliably to bend sheets as follows to make commercially-useful products : -
  • the ammonia is then allowed to dissipate, whereupon the MDF reverts to its normal, relatively unplastic, form, which it thereafter maintains.
  • a strip of MDF clamped to and bent around a former in a jig may simply be left there for several hours, during which the ammonia diffuses out of the strip and away, and when removed from the former the strip will then hold its new shape.
  • the surface of an MDF sheet treated by the method of the invention may be roughened slightly as a result of moisture absorption. This roughening can usually be removed by a simple buffing operation once the bent and shaped sheet has been dried and thus "fixed" into the required shape.
  • ammonia treatment of the method of the invention may cause a small amount of swelling of the MDF sheet, this is not significant, and should not cause any noticeable distortion of the finished product.
  • the invention extends, of course, to shaped MDF articles whenever made by a process according to the invention.
  • the following Examples are now given, though by way of illustration only, to show details of an embodiment of the method of the invention.
  • the sheets were placed in the autoclave, and the latter was evacuated down to a pressure of 0.1 Bar and stabilised at ambient temperature.
  • the sheets were held at this low pressure for 2 mins, whereupon gaseous ammonia (from a cylinder of anhydrous liquid ammonia) was allowed in over a period of 4 mins, all the while maintaining the temperature more or less constant, until the internal pressure had risen to 4 Bar.
  • the sheet was kept in the ammonia atmosphere for 4
  • the sheets were taken out and placed in a variety of bending jigs of standard form as appropriate. In this way one, for example, was bent into a semicircle outside diameter 800 mm. Thus bent, the sheets were then secured in place in the jigs and allowed to "dry" - that is, the absorbed ammonia was allowed to evaporate off (this evaporation was encouraged by blowing warm air over the sheet). For the first half-an-hour or so each sheet was retained clamped in its jig, but at the end of this time it sheet was undamped and removed from the jig, and allowed to dry "free-standing" for another four or five hours.
  • each sheet had recovered its normal physical properties, but retained its new shape and resisted any ordinary attempts to unshape it.
  • a third batch was treated in much the same way except that it was subjected to a 0.1 bar vacuum after the ammonia withdrawal to hasten the "drying" stage - and in fact the product needed no further drying at all

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Les MDF, ou panneaux de fibres de densité moyenne, sont communément utilisés comme substituts pour le bois. Ces panneaux sont généralement fabriqués sous forme de feuilles planes, en un matériau dur, rigide et inflexible qu'il est difficile de plier pour lui conférer les formes complexes souvent requises. Il a été découvert qu'en imprégnant le MDF avec de l'amoniaque (utilisée sous une forme anhydre, c'est-à-dire sèche et gazeuse), l'on peut rendre le MDF relativement malléable, et, sous cette forme malléable, ce matériau peut être aisément comprimé ou plié pour adopter pratiquement n'importe quelle forme requise.
PCT/GB1993/000696 1992-04-04 1993-04-02 Pliage et profilage de panneaux de fibres de densite moyenne (mdf) WO1993019910A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9207418A GB2265914A (en) 1992-04-04 1992-04-04 Method of plasticising medium density fibre board
GB9207418.6 1992-04-04
GB9306627.2 1993-03-30
GB939306627A GB9306627D0 (en) 1992-04-04 1993-03-30 Bending and shaping mdf

Publications (1)

Publication Number Publication Date
WO1993019910A1 true WO1993019910A1 (fr) 1993-10-14

Family

ID=26300653

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1993/000696 WO1993019910A1 (fr) 1992-04-04 1993-04-02 Pliage et profilage de panneaux de fibres de densite moyenne (mdf)

Country Status (3)

Country Link
AU (1) AU3898193A (fr)
GB (1) GB2265915A (fr)
WO (1) WO1993019910A1 (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1024234B1 (fr) * 1996-06-11 2002-06-26 Unilin Beheer B.V. Revêtement de sol composé de panneaux de planchers durs
US7431979B2 (en) 2002-11-12 2008-10-07 Kronotec Ag Wood fiberboard
US7484337B2 (en) 2002-11-15 2009-02-03 Kronotec. Ag Floor panel and method of laying a floor panel
US7506481B2 (en) 2003-12-17 2009-03-24 Kronotec Ag Building board for use in subfloors
US7550202B2 (en) 2004-03-11 2009-06-23 Kronotec Ag Insulation board made of a mixture of wood base material and binding fibers
US7562431B2 (en) 2004-01-30 2009-07-21 Flooring Technologies Ltd. Method for bringing in a strip forming a spring of a board
US7617651B2 (en) 2002-11-12 2009-11-17 Kronotec Ag Floor panel
US7621092B2 (en) 2006-02-10 2009-11-24 Flooring Technologies Ltd. Device and method for locking two building boards
US7641963B2 (en) 2002-11-12 2010-01-05 Kronotec Ag Panel and process for producing a panel
US8627631B2 (en) 2000-06-20 2014-01-14 Flooring Industries Limited, Sarl Floor covering
US9255414B2 (en) 2000-03-31 2016-02-09 Pergo (Europe) Ab Building panels
US9365028B2 (en) 2006-02-21 2016-06-14 Flooring Technologies Ltd. Method for finishing a building board and building board
US9464443B2 (en) 1998-10-06 2016-10-11 Pergo (Europe) Ab Flooring material comprising flooring elements which are assembled by means of separate flooring elements
US9464444B2 (en) 2010-01-15 2016-10-11 Pergo (Europe) Ab Set of panels comprising retaining profiles with a separate clip and method for inserting the clip
US9593491B2 (en) 2010-05-10 2017-03-14 Pergo (Europe) Ab Set of panels
US9816278B2 (en) 2005-12-29 2017-11-14 Flooring Technologies Ltd. Panel and method of manufacture

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0316574D0 (en) * 2003-07-16 2003-08-20 Univ Wales Recycling of wood based panels
WO2005007968A1 (fr) * 2003-07-16 2005-01-27 Fira International Limited Recyclage de planches a base de lignocellulose
WO2011031223A1 (fr) * 2009-09-11 2011-03-17 Design Force Ab Procédé de fabrication d'un panneau

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3282313A (en) * 1964-11-24 1966-11-01 Research Corp Method of forming wood and formed wood product
US3642042A (en) * 1970-06-17 1972-02-15 Robert W Davidson Method of forming wood
AT326339B (de) * 1971-09-14 1975-12-10 Inst Khim Drevesiny Akademii N Verfahren zum verdichten von vollholz
EP0197674A1 (fr) * 1985-03-15 1986-10-15 Peter Favot Procédé pour densifier des bois de basse densité
EP0320712A2 (fr) * 1987-12-16 1989-06-21 Kurt Held Méthode et dispositif pour la fabrication de panneaux lignocellulosiques

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3282313A (en) * 1964-11-24 1966-11-01 Research Corp Method of forming wood and formed wood product
US3642042A (en) * 1970-06-17 1972-02-15 Robert W Davidson Method of forming wood
AT326339B (de) * 1971-09-14 1975-12-10 Inst Khim Drevesiny Akademii N Verfahren zum verdichten von vollholz
EP0197674A1 (fr) * 1985-03-15 1986-10-15 Peter Favot Procédé pour densifier des bois de basse densité
EP0320712A2 (fr) * 1987-12-16 1989-06-21 Kurt Held Méthode et dispositif pour la fabrication de panneaux lignocellulosiques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 73 Columbus, Ohio, US; abstract no. 16501, SKRUPSKIS, V. ET AL. 'Slide bearings from curved pieces of chemically plasticized' *

Cited By (51)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7621094B2 (en) 1996-06-11 2009-11-24 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US7328536B2 (en) 1996-06-11 2008-02-12 Unilin Beheer B.V. Floor panels with edge connectors
EP1024234B1 (fr) * 1996-06-11 2002-06-26 Unilin Beheer B.V. Revêtement de sol composé de panneaux de planchers durs
US7467499B2 (en) 1996-06-11 2008-12-23 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US7640708B2 (en) 1996-06-11 2010-01-05 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US7637067B2 (en) 1996-06-11 2009-12-29 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US7637066B2 (en) 1996-06-11 2009-12-29 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US7634887B2 (en) 1996-06-11 2009-12-22 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US7617645B2 (en) 1996-06-11 2009-11-17 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US7634886B2 (en) 1996-06-11 2009-12-22 Unilin Beheer B.V., Besloten Vennootschap Floor panels with edge connectors
US8997429B2 (en) 1996-06-11 2015-04-07 Unilin Beheer B.V. Floor panels with edge connectors
US9464443B2 (en) 1998-10-06 2016-10-11 Pergo (Europe) Ab Flooring material comprising flooring elements which are assembled by means of separate flooring elements
US9534397B2 (en) 2000-03-31 2017-01-03 Pergo (Europe) Ab Flooring material
US9611656B2 (en) 2000-03-31 2017-04-04 Pergo (Europe) Ab Building panels
US9677285B2 (en) 2000-03-31 2017-06-13 Pergo (Europe) Ab Building panels
US10156078B2 (en) 2000-03-31 2018-12-18 Pergo (Europe) Ab Building panels
US10233653B2 (en) 2000-03-31 2019-03-19 Pergo (Europe) Ab Flooring material
US9316006B2 (en) 2000-03-31 2016-04-19 Pergo (Europe) Ab Building panels
US9260869B2 (en) 2000-03-31 2016-02-16 Pergo (Europe) Ab Building panels
US9255414B2 (en) 2000-03-31 2016-02-09 Pergo (Europe) Ab Building panels
US10626619B2 (en) 2000-03-31 2020-04-21 Unilin Nordic Ab Flooring material
US9068356B2 (en) 2000-06-20 2015-06-30 Flooring Industries Limited, Sarl Floor covering
US9376823B1 (en) 2000-06-20 2016-06-28 Flooring Industries Limited, Sarl Floor covering
US10125498B2 (en) 2000-06-20 2018-11-13 Flooring Industries Limited, Sarl Floor covering
US8793958B2 (en) 2000-06-20 2014-08-05 Flooring Industries Limited, Sarl Floor covering
US8904729B2 (en) 2000-06-20 2014-12-09 Flooring Industries Limited, Sarl Floor covering
US9234356B2 (en) 2000-06-20 2016-01-12 Flooring Industries Limited, Sarl Floor covering
US8631625B2 (en) 2000-06-20 2014-01-21 Flooring Industries Limited, Sarl Floor covering
US8627631B2 (en) 2000-06-20 2014-01-14 Flooring Industries Limited, Sarl Floor covering
US9624676B2 (en) 2000-06-20 2017-04-18 Flooring Industries Limited, Sarl Floor covering
US9334657B2 (en) 2000-06-20 2016-05-10 Flooring Industries Limted, Sarl Floor covering
US9482013B2 (en) 2000-06-20 2016-11-01 Flooring Industries Limited, Sarl Floor covering
US9856657B2 (en) 2000-06-20 2018-01-02 Flooring Industries Limited, Sarl Floor covering
US9388585B1 (en) 2000-06-20 2016-07-12 Flooring Industries Limited, Sarl Floor covering
US9388586B1 (en) 2000-06-20 2016-07-12 Flooring Industries Limited, Sarl Floor covering
US9394699B1 (en) 2000-06-20 2016-07-19 Flooring Industries Limited, Sarl Floor covering
US10407920B2 (en) 2000-06-20 2019-09-10 Flooring Industries Limited, Sarl Floor covering
US7431979B2 (en) 2002-11-12 2008-10-07 Kronotec Ag Wood fiberboard
US7617651B2 (en) 2002-11-12 2009-11-17 Kronotec Ag Floor panel
US7641963B2 (en) 2002-11-12 2010-01-05 Kronotec Ag Panel and process for producing a panel
US8833029B2 (en) 2002-11-12 2014-09-16 Kronotec Ag Floor panel
US7484337B2 (en) 2002-11-15 2009-02-03 Kronotec. Ag Floor panel and method of laying a floor panel
US9169658B2 (en) 2002-11-15 2015-10-27 Kronotec Ag Floor panel and method of laying a floor panel
US7506481B2 (en) 2003-12-17 2009-03-24 Kronotec Ag Building board for use in subfloors
US7562431B2 (en) 2004-01-30 2009-07-21 Flooring Technologies Ltd. Method for bringing in a strip forming a spring of a board
US7550202B2 (en) 2004-03-11 2009-06-23 Kronotec Ag Insulation board made of a mixture of wood base material and binding fibers
US9816278B2 (en) 2005-12-29 2017-11-14 Flooring Technologies Ltd. Panel and method of manufacture
US7621092B2 (en) 2006-02-10 2009-11-24 Flooring Technologies Ltd. Device and method for locking two building boards
US9365028B2 (en) 2006-02-21 2016-06-14 Flooring Technologies Ltd. Method for finishing a building board and building board
US9464444B2 (en) 2010-01-15 2016-10-11 Pergo (Europe) Ab Set of panels comprising retaining profiles with a separate clip and method for inserting the clip
US9593491B2 (en) 2010-05-10 2017-03-14 Pergo (Europe) Ab Set of panels

Also Published As

Publication number Publication date
GB9307035D0 (en) 1993-05-26
GB2265915A (en) 1993-10-13
AU3898193A (en) 1993-11-08

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