EP0553420B1 - MDF-Platte und Verfahren zu ihrer Herstellung - Google Patents

MDF-Platte und Verfahren zu ihrer Herstellung Download PDF

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Publication number
EP0553420B1
EP0553420B1 EP92119655A EP92119655A EP0553420B1 EP 0553420 B1 EP0553420 B1 EP 0553420B1 EP 92119655 A EP92119655 A EP 92119655A EP 92119655 A EP92119655 A EP 92119655A EP 0553420 B1 EP0553420 B1 EP 0553420B1
Authority
EP
European Patent Office
Prior art keywords
mdf
board
cuts
incisions
moulded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92119655A
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German (de)
English (en)
French (fr)
Other versions
EP0553420A1 (de
Inventor
Jan Hogh Holub
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Glunz AG
Original Assignee
Glunz AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Glunz AG filed Critical Glunz AG
Publication of EP0553420A1 publication Critical patent/EP0553420A1/de
Application granted granted Critical
Publication of EP0553420B1 publication Critical patent/EP0553420B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27H—BENDING WOOD OR SIMILAR MATERIAL; COOPERAGE; MAKING WHEELS FROM WOOD OR SIMILAR MATERIAL
    • B27H1/00—Bending wood stock, e.g. boards
    • 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

Definitions

  • the invention relates to an MDF board (medium-density fiberboard) with incisions made transversely to the direction of extension of its main surface to produce a curved body, webs remaining at the base of the incisions and ribs formed between the adjacent incisions, which after the transfer into the curved shape can be permanently fixed.
  • MDF board medium-density fiberboard
  • a method for the production of such MDF boards is also shown and the use of such MDF boards for the production of curved bodies is described.
  • An MDF board of the type described above is known from DE-PS 39 24 835.
  • this MDF board with smooth surfaces is first provided with incisions which are guided with a circular saw or with a multi-blade saw transversely to the direction of extension of the main surfaces of the MDF board from one surface in such a way that the MDF board is not completely separated, but webs remain at the bottom of the incisions and ribs are formed between the adjacent incisions.
  • the MDF boards produced and equipped in this way in the MDF plant are then generally used by the processor for their final use.
  • a fixing compound is introduced into the incisions, so that the incisions are at least partially filled with the fixing compound.
  • the MDF board is then transferred to the curved form.
  • Such an MDF board in particular for the production of a curved body, permits a wide range of possible uses, for example for producing rounded edges in industrial as well as in individual furniture production.
  • Prefabricated elements can be used to clad walls and ceilings in interior fittings.
  • Door panels according to frame type or the like can also be provided with curves in this way.
  • a disadvantage of such known MDF boards is the so-called polygon effect, ie the surface of the curved body made of the MDF board facing the free view has no circular arc shape and also no other, continuously running curvature, but rather occurs when it is transferred into the curved shape polygonal body in cross section.
  • This is due to the fact that when the MDF board is transferred into the curved shape, the parts of the surface adjacent to the ribs of the surface accessible to the free view hardly deform, but remain as straight sections, while the bending is only noticeable in the area of the webs power.
  • This polygon effect which adversely affects the appearance, is particularly disadvantageous in the case of small bending radii of the MDF board. The same applies to surfaces that are provided with a varnish or coating for surface finishing.
  • the polygon effect is comparatively more disadvantageous than when using matt gloss lacquers. It has become known to eliminate the disadvantageous polygon effect, the curved body undergo a cylindrical grinding process on its surface accessible to the free view after the fixing compound has hardened. This cylindrical grinding is done by hand and is therefore very cost-intensive.
  • DE-PS 38 40 292 discloses a method for producing a structure, in particular a wood structure, into the surface of a hardened fiberboard, also of an MDF board.
  • the fiberboard is subjected to a two-stage manufacturing process in that the shaping of the fiberboard takes place in the first stage in the usual way, usually in a continuous manufacturing process.
  • a structure is introduced into the surface of such an already hardened fiberboard by applying a resin-water mixture to the surface of the fiberboard on one or both sides, which softens penetrates into the surface of the fiberboard.
  • the fiberboard is then pressed in a second stage using a short-cycle press under the action of pressure and heat and using a structured press plate, the Water portion of the resin-water mixture to evaporate and the resin portion to be cured.
  • the structure of the press plate is thus molded directly into the surface of the fiberboard.
  • this known method is always only about the production of flat fiberboard.
  • the invention has for its object to show an MDF board of the type described above and a method for its production and use, which are suitable for the production of curved bodies, which can be dispensed with the complex cylindrical grinding and yet a refined surface is created in which the polygon effect is not disturbing.
  • the MDF board at least on its surface accessible to the unobstructed view, has a structure, in particular a wood structure, which is embossed in a flat state and has a roughness depth which covers the polygon effect.
  • the surface accessible to the unobstructed view is the surface of the plate which ultimately determines the decorative appearance, for example, of the piece of furniture produced using it. As a rule, this will be the outside, in particular the front of the piece of furniture, the door clothing or the like.
  • the embossed structure does not fundamentally prevent the polygonal deformation of the plate when it is brought into the curved shape, the embossed structure ensures that the polygonal deformation is overplayed from an aesthetic point of view and is therefore no longer perceived when viewed normally.
  • This surprising effect occurs with any type of rounding, be it concave or convex; it is also largely independent of the bending radius.
  • Memorizing the structure takes place either directly in the surface of the MDF board or in a coating, paper cover layer or the like connected to the surface of the MDF board. Wooden structures with an irregular design are used in particular as embossed structures. However, it is also possible to use artificial structures in the form of nubs, ribs or in any other way in order to achieve special aesthetic effects.
  • the type of structure used does not in any way prevent the exclusion of further surface finishing, for example in the form of applying a lacquer.
  • no stresses that reinforce the polygon effect arise in the plate when it is converted into the curved shape.
  • the reason for this is to be seen in the fact that the structure is arranged directly in the MDF board or in a coating, paper cover layer or the like connected to the surface of the MDF board. This also eliminates the risk of cracking during the bending process. It is also advantageous that post-treatments, such as the known cylindrical grinding, are not necessary.
  • the subsequent application of a varnish to the fixed, hardened and curved body creates extremely decorative surfaces.
  • the paint can also be applied transparently or just covering it. There are no tensions in the paint layer.
  • a paper cover layer is placed on the MDF board in a flat state.
  • the paper cover layer has a resin coating on its underside, i.e. on the contact side with the MDF board.
  • a base paper which can have a basis weight of approximately 100 g / m 2, is used in particular as the paper cover layer.
  • the thickness of this paper layer is approximately 0.2 mm. It is a non-continuous or weakly continuous paper, i.e. a paper that has a resin content of 0 to about 50% of the paper weight.
  • the embossing depth can be kept lower here than when directly embossed into the surface of the MDF board; however, the embossing depth should be at least 100 »m.
  • the paper cover layer is connected to the MDF board in one operation, whereby the structure is embossed into the paper cover layer. This is done using heat and pressure and with a press plate usually attached to the press ram. The heat and pressure on the one hand activate the resin coating so that the connection of the paper cover layer with the surface of the MDF board is brought about. At the same time, the paper top layer receives the embossed structure. Further processing can be carried out in the usual way, namely by introducing the slits, etc. Such primer papers are applied to normal chipboard with their comparatively rough, jagged surface if they are to be prepared for a subsequent painting process.
  • MDF boards on the other hand, have a largely closed, flat surface, so that the use of base paper, in particular to prepare for subsequent painting, appears to be superfluous.
  • base paper in particular to prepare for subsequent painting, appears to be superfluous.
  • the use of base paper surprisingly also produces the desired effect. This is also due to the fact that such base papers have comparatively elastic properties and, in so far, bring about a compensating effect when the slotted MDF board is transferred into the desired curved shape.
  • the embossed structure can have depressions whose main direction of extension runs parallel or at a slight angle to the main direction of extent of the incisions. This relative arrangement to each other is particularly effective for the optical covering of the polygon effect.
  • the depressions as are typical for a wood structure, thus run in the form of approximately straight surface lines on the ultimately curved body.
  • Imaginative structures should be aligned so that they Have recesses elongated in one direction, which are then also arranged approximately parallel to the incisions.
  • the structure expediently has a roughness depth of more than 200 »m.
  • the shape of the structure also has a certain importance in that irregular structures are more suitable than regular ones. However, the desired effect can be influenced by increased roughness depth.
  • the structure can be attached or introduced to the MDF board only on one side or on both sides. Even when used on one side, the MDF panels do not lose their straightness, so that it is advantageously possible to use the structure only on one surface, namely that which is exposed to the later free top view of the piece of furniture or the like.
  • the width of the ribs should be equal to or greater than the width of the cuts.
  • the individual dimensions depend on the bending radius that is used. However, it is also possible to use the conditions at the incisions and ribs largely in the same way as a universal MDF board to produce various curves with different bending radii.
  • a method for producing an MDF board according to one of the preceding claims is characterized according to the invention in that after the shaping of the MDF board, the structure is molded in on one or both sides in a lying-flat state on the surface side, and in that the incisions are subsequently made. It is understood that the incisions are made starting from the other surface of the MDF board which is not provided with the structure.
  • the MDF board produced in this way is then delivered from the MDF plant to the processor, where the transfer, Fixation and stabilization takes place in the curved shape. It goes without saying that the MDF panel need not be provided with the incisions over its entire main extension plane; the incisions are only provided in areas that give off curves in the curved shape.
  • the structure is advantageously molded in by applying a resin-water mixture to the surface in question, under the action of pressure and heat and using a structured press plate.
  • the molding of the structure thus represents the second process step after the MDF board has got its basic shape with smooth and calibrated surfaces in a first manufacturing step.
  • the resin-water mixture penetrates into the surface of the fully hardened MDF board and softens it in the surface areas, so that the structure of the press plate is molded in this surface during the subsequent pressing in a short-cycle press.
  • the resin portion of the resin-water mixture hardens while the water portion evaporates.
  • a melamine resin in particular can be used as the resin; the resin-water mixture is used in a proportion of 25 to 50%, in particular 30%, of resin.
  • the relatively high proportion of water is important for easy molding of the structure of the press plate into the surface of the MDF board.
  • a method for producing a curved body from such an MDF board is characterized according to the invention in that a fixing compound is introduced into the incisions of an MDF board according to claim 1, the MDF board is converted into the desired curved shape and stabilized until the fixing compound has hardened becomes.
  • This Usage methods can either be partially applied at the manufacturer of the MDF boards, ie they can be prepared by molding the structure and making the incisions there. Further steps of use are generally carried out at the processor, namely the application of the fixing compound, the transfer of the MDF board into the desired curved shape and the stabilization of the shaped body thus formed until the fixing compound has hardened.
  • Adhesive or adhesive paste mixed with wood fiber can be used as the fixing compound.
  • This fixing compound can also be used to connect two MF plates inserted back to back.
  • the MDF board 1 shown in cross section in FIG. 1 has the usual board shape and is produced in the known thickness gradations.
  • the MDF board 1 is first produced as a board with two smooth surfaces.
  • One surface 2 remains in its smooth shape, while the other surface 3 is provided with a structure 4 in a second process step, which is worked into the surface 3 of the MDF board 1.
  • the surface 3 is the surface accessible to the free view on the workpiece produced therefrom, in particular a piece of furniture.
  • the surface 3 with its structure 4 thus represents the decorative surface or ultimately the front, while the surface 2 with its smooth design represents the back. But it is also possible to use both surfaces 2 and 3 to be provided with a structure 4.
  • the structure 4 can be designed as a wooden structure, as shown in FIGS. 5 and 6.
  • Fantasy structures are also possible, examples of which are shown in FIGS. 7 and 8. It is important that the structure 4 has a certain roughness depth which is sufficient to cover up the polygon effect.
  • the relative arrangement of the course of the structure 4 to a bending axis 5 is also important in this context.
  • the structure 4 has depressions 6 which extend essentially parallel to the course of the bending axis 5.
  • the depressions can also run at a small angle in the range between 3 and 10 ° obliquely to the bending axis 5 in the surface 3, as is typical for the course of a wood structure. This creates an angular overlap between the edges that realize the polygon effect, ie the depressions 6 and thus the structure 4 optically cover the polygon effect.
  • the MDF board 1 according to FIG. 1 is provided with the structure 4 in the area of its one surface 3, the areas of the board which are to give off curves are provided with incisions 7.
  • the incisions 7 are transverse from the surface 2, i. H. introduced into the MDF board 1 perpendicular to its main plane of extension, but in such a way that webs 8 remain in the area of the other surface 3, which is provided with the structure 4, by which the cohesion of the MDF board 1 is initially ensured. This creates ribs 9 between the incisions 7.
  • a fixing compound 10 is introduced into the incisions 7 by the processor, as indicated in cross-section in FIGS. 2 to 4.
  • the MDF board 1 is then transferred into the curved shape shown. Excess fixing compound 10 that swells out of the incisions 7 in the area of the surface 2 can be removed become.
  • the molded body bent from the relevant MDF board 1 is then fixed in this bent shape until the fixing compound has hardened.
  • FIG. 2 represents the prior art and serves to illustrate the polygon effect.
  • An MDF board 1 is shown here, in which not only the surface 2 forming the back is smooth, but also the other surface 2 ', which ultimately forms the front or the surface accessible to the free view in the area of the later piece of furniture .
  • FIG. 2 It can be seen from the graphical illustration in FIG. 2 that in the region of the ribs 9 there are rectilinear surface parts which are shown in cross section as rectilinear sections 11.
  • the transition between two adjacent sections 11 takes on a transition or edge shape.
  • one or two more or less clearly appearing edges are formed here, which represent a transition line 12 between the straight sections 11.
  • FIGS. 3 and 4 show the MDF board 1 according to FIG. 1, that is to say with the structure 4 in the surface 3, in the curved shape, that is to say with hardened fixing compound 10.
  • the geometry of the incisions 7 and the ribs 9 is variable, so that the width of the incisions 7 and the thickness of the ribs 9 can be selected depending on the application.
  • an MDF board 1 which can optionally be used in the curved shape using different bending radii is transferable, as shown in Figures 3 and 4 in comparison to each other.
  • the smallest bending radius around the bending axis 5 is selected, so that the ribs 9 abut one another on the back, that is to say on the surface 2.
  • a larger bending radius is selected, so that 9 areas remain between the rear corners of the ribs, in which fixing compound 10 is located.
  • FIGS. 5 and 6 illustrate curved bodies composed of MDF boards 1, in which the structures 4 on the decorative side are designed as wooden structures or are molded into the surface 3 in question.
  • two MDF panels are assembled 1 back to back and fixed in the curved shape.
  • FIG. 5 only the one MDF board 1 is provided on its surface 3 with the structure 4, which is convex to the outside.
  • the other surface 2 ' is smooth, since it represents the rear side and is not accessible for free viewing in the application in question or less demands are made here.
  • FIG. 6 shows that two MDF boards 1, each of which has the structure 4 on its surface 3, are assembled back to back. The surface 2 of the two MDF panels 1 thus reaches the center of the assembled body and is therefore no longer accessible to the view.
  • the connection of the two plates 1 takes place via the fixing compound 10.
  • the curved shaped body according to FIG. 6 thus has decorative surfaces on both sides, even if the structure 4 is shown or illustrated as a wooden structure here only on the concave side. It can also be seen from FIGS. 5 and 6 that the wood grain runs obliquely to the bending axis 5 at a small angle, which is particularly effective in order to decoratively cover the polygon effect or to no longer have an adverse effect.
  • FIGS. 7 and 8 illustrate further possible structures 4 which are not designed as wooden structures, but are composed of depressions 6 of one type (FIG. 7) or depressions 6 of different types (FIG. 8).
  • the depressions 6 extend essentially, ie with their main extension, parallel or in the direction of the bending axis 5, while the transverse extension is only a fraction.
  • the depressions 6 are therefore longer in the direction of the bending axis 5 than transversely thereto.
  • the arrangement of the depressions in relation to the bending edge 5 is also important.
  • the exactly parallel arrangement is shown in FIGS. 7 and 8. However, it is expedient if the rows of the depressions 6 run obliquely at a small angle of perhaps 3 to 10 ° to the bending axis 5. As a result, the broken edges of the polygon effect are always interrupted at different locations when viewed from the depressions 6 over the surface of the surface 3, so that the polygon effect disappears optically.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Manufacture And Refinement Of Metals (AREA)
EP92119655A 1992-01-28 1992-11-19 MDF-Platte und Verfahren zu ihrer Herstellung Expired - Lifetime EP0553420B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4202190 1992-01-28
DE4202190A DE4202190C1 (enrdf_load_stackoverflow) 1992-01-28 1992-01-28

Publications (2)

Publication Number Publication Date
EP0553420A1 EP0553420A1 (de) 1993-08-04
EP0553420B1 true EP0553420B1 (de) 1995-07-26

Family

ID=6450351

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92119655A Expired - Lifetime EP0553420B1 (de) 1992-01-28 1992-11-19 MDF-Platte und Verfahren zu ihrer Herstellung

Country Status (7)

Country Link
EP (1) EP0553420B1 (enrdf_load_stackoverflow)
AT (1) ATE125482T1 (enrdf_load_stackoverflow)
DE (2) DE4202190C1 (enrdf_load_stackoverflow)
DK (1) DK0553420T3 (enrdf_load_stackoverflow)
ES (1) ES2077333T3 (enrdf_load_stackoverflow)
GR (1) GR3017527T3 (enrdf_load_stackoverflow)
TW (1) TW222012B (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4439020C1 (de) * 1994-11-02 1995-11-02 Glunz Ag Verfahren zur Herstellung eines eine Hauptfläche und eine Kante aufweisenden Möbelteils
DK172290B1 (da) * 1996-11-22 1998-03-02 Hornslet Moebelfabrik A S Fremgangsmåde til fremstilling af en krum træfiberplade, møbelplade til brug ved udøvelse af fremgangsmåden og træfiberplade fremstillet ved fremgangsmåden.
DE69825140D1 (de) * 1998-04-01 2004-08-26 Hornslet Moebelfabrik As Horns Verfahren zur Herstellung von Möbelpaneele und nach dem Verfahren hergestellte Paneele
DE29905123U1 (de) 1999-03-22 1999-07-22 Franz Kaldewei GmbH & Co, 59229 Ahlen Plattenförmiges Element
DE19910718C2 (de) * 1999-03-10 2003-06-26 Ross Design Gmbh Verfahren zur Herstellung eines plattenähnlichen Teils für Möbel
CA2383754A1 (en) 1999-09-02 2001-03-15 Hornslet Mobelfabrik A/S A method for the manufacture of a panel and a panel obtained by such a method
EP2283190B1 (en) * 2008-03-28 2020-11-11 Noble Environmental Technologies Corporation Engineered molded fiberboard panels, methods of making the panels, and products fabricated from the panels
DE102013201164B3 (de) * 2013-01-24 2014-08-07 Trend-Store Shop Creation Gmbh Gebogene Paneelwand und Verfahren zu deren Herstellung
ES1115780Y (es) * 2014-06-27 2014-10-02 Ramirez Miguel Angel Sanchez Elemento estructural para mobiliario y otros usos
GR1008980B (el) * 2015-09-16 2017-03-14 Μαριολοπουλος Επε Τεχνικη επεξεργασιας πανελ για δημιουργια καμπυλης οποιασδηποτε μορφης ή σχηματος
CH712927A1 (de) * 2016-09-07 2018-03-15 Timber Structures 3 0 Ag Verfahren zur Überhöhung eines Holzelements.
CZ2018172A3 (cs) * 2018-04-06 2019-07-17 IKTUS, s.r.o. Ohýbaný sendvičový díl
CN114761230A (zh) * 2019-11-26 2022-07-15 康宁股份有限公司 具有抗弯垂性的玻璃层叠面板

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE904461C (de) * 1951-11-15 1954-02-18 Suedostholz G M B H Metz & Co Dreischichtenspanplatte
DE2815714A1 (de) * 1978-04-12 1979-10-25 Bz Plankenhorn Kg Verfahren zum herstellen von konvexen rundungen aus beschichtetem, plattenfoermigem material
DE3840292A1 (de) * 1988-11-30 1990-05-31 Topan Gmbh Verfahren zur erzeugung einer struktur, insbesondere holzstruktur, an der oberflaeche von faserplatten
DE3924835C1 (en) * 1989-07-27 1990-09-06 Glunz Ag, 4700 Hamm, De Forming curve in fibre-board - involves cutting deep grooves on inside of curve, bending and then gluing ends of ribs together

Also Published As

Publication number Publication date
DE59203039D1 (de) 1995-08-31
TW222012B (enrdf_load_stackoverflow) 1994-04-01
DK0553420T3 (da) 1995-09-11
ES2077333T3 (es) 1995-11-16
ATE125482T1 (de) 1995-08-15
GR3017527T3 (en) 1995-12-31
DE4202190C1 (enrdf_load_stackoverflow) 1993-07-15
EP0553420A1 (de) 1993-08-04

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