CA2043130A1 - Process and a machine for producing a component in board form having a postforming edge, as well as a board produced by this process - Google Patents
Process and a machine for producing a component in board form having a postforming edge, as well as a board produced by this processInfo
- Publication number
- CA2043130A1 CA2043130A1 CA 2043130 CA2043130A CA2043130A1 CA 2043130 A1 CA2043130 A1 CA 2043130A1 CA 2043130 CA2043130 CA 2043130 CA 2043130 A CA2043130 A CA 2043130A CA 2043130 A1 CA2043130 A1 CA 2043130A1
- Authority
- CA
- Canada
- Prior art keywords
- board
- edge
- wedge
- postforming
- machine
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 41
- 238000010030 laminating Methods 0.000 claims abstract description 29
- 238000003801 milling Methods 0.000 claims abstract description 24
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000009966 trimming Methods 0.000 claims abstract description 12
- 238000005452 bending Methods 0.000 claims abstract description 10
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000003475 lamination Methods 0.000 claims description 22
- 238000004026 adhesive bonding Methods 0.000 claims description 20
- 239000003292 glue Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 239000011796 hollow space material Substances 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 229940000425 combination drug Drugs 0.000 claims description 2
- 239000011093 chipboard Substances 0.000 description 16
- 229920000877 Melamine resin Polymers 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 239000004640 Melamine resin Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 3
- 239000002023 wood Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000012815 thermoplastic material Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C63/00—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor
- B29C63/02—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material
- B29C63/04—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like
- B29C63/044—Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor using sheet or web-like material by folding, winding, bending or the like continuously
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
- B27D5/003—Other working of veneer or plywood specially adapted to veneer or plywood securing a veneer strip to a panel edge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27F—DOVETAILED WORK; TENONS; SLOTTING MACHINES FOR WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES
- B27F1/00—Dovetailed work; Tenons; Making tongues or grooves; Groove- and- tongue jointed work; Finger- joints
- B27F1/02—Making tongues or grooves, of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G11/00—Applying adhesives or glue to surfaces of wood to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
- B27G5/00—Machines or devices for working mitre joints with even abutting ends
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M1/00—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching
- B27M1/08—Working of wood not provided for in subclasses B27B - B27L, e.g. by stretching by multi-step processes
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Manufacturing & Machinery (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
Abstract
G. Stefani S.p.A.
Thiene (Italy) A process and a machine for producing a component in board form having a postforming edge, as well as a board produced by this process Abstract of the disclosure A process for producing a workpiece in board form having a postforming edge and a board produced by this process, which comprises a laminated board being provided with a hollow recess by cutting material removal, the laminating material being stripped on one side and, at the same time, a wedge-shaped piece of material being produced on the opposite side of the board, and the piece of material of wedge-shaped design being bent off toward the body of the board in order to be glued onto the board, and the board subsequently being subjected to a trimming operation and, after that, sheathed in the previously stripped laminating material, using the postforming technique, as well as a machine for producing the sheathed edge of the workpiece in board form, using the laminating material which has previously been applied to the faces of the board, in order to produce a post-forming edge or a softforming edge without interruption, with the provison of a trimming mechanism, followed by a milling apparatus, which is followed by a scoring apparatus, a precision milling mechanism, as well as an apparatus for profile milling, with a sawing apparatus, followed by a further milling apparatus, followed by an additional scoring apparatus and a glue-applying apparatus, as well as a bending and pressing mechanism and finally a trimming apparatus.
Thiene (Italy) A process and a machine for producing a component in board form having a postforming edge, as well as a board produced by this process Abstract of the disclosure A process for producing a workpiece in board form having a postforming edge and a board produced by this process, which comprises a laminated board being provided with a hollow recess by cutting material removal, the laminating material being stripped on one side and, at the same time, a wedge-shaped piece of material being produced on the opposite side of the board, and the piece of material of wedge-shaped design being bent off toward the body of the board in order to be glued onto the board, and the board subsequently being subjected to a trimming operation and, after that, sheathed in the previously stripped laminating material, using the postforming technique, as well as a machine for producing the sheathed edge of the workpiece in board form, using the laminating material which has previously been applied to the faces of the board, in order to produce a post-forming edge or a softforming edge without interruption, with the provison of a trimming mechanism, followed by a milling apparatus, which is followed by a scoring apparatus, a precision milling mechanism, as well as an apparatus for profile milling, with a sawing apparatus, followed by a further milling apparatus, followed by an additional scoring apparatus and a glue-applying apparatus, as well as a bending and pressing mechanism and finally a trimming apparatus.
Description
2~313~
G. ~tefani S.p.A.
Thiene (Italy) A process and a machine for producing a component in board form having a postforming edge, as well as a board produced by this process The present invention relates to a process for producing a workpiece in board form having a so-called postforming edge. The invention relates ~urthermore to a board produced by this process. The present invention also relates to a machine ~or sheathing the edges of workpieces in board form, which are used for the produc-tion of furniture and with which the laminating material of one ace of the workpiece in board form is used for the sheathing of the edge. It is known from the prior art to provide chipboards for the furniture industry with a-l~mination on both faces, for e~ample with natural wood veneer.
Often, the ~inishing layer for workpieces in board ~orm consists of synthetically produced material, for example a melamine lamination or a thermoplastic material.
These plastic laminations are glued onto the faces of the supporting board with the assistance of large presses.
Wherever it is desired to lend the Pdges of the b~ard rounded-off lengthwise profiling~, in order for example to create rounded-of~ edges, with the assist~nce of the so-called postforming technique, it is necessary to allow the laminating material ~or the production o a post~orming edge, applied in the press, to protrude by a few centimeters ~rom the surface o~ the supporting board laminated in the press.
If it is assumed that the laminating material applied in the plate presses has to be mada very thin and, besides, is also very brittle, it is understandable that the necessity to leave an unp~otected strip o~ the laminating material pro~ruding ~rom the board running out of the press leads to considerable difficulties, whether during transport or during storage of the board.
In order to avoid these disadvantages, it has become known from the prior art to use a process in which the body of the board is laminated on both faces with a lamina-te which does not project beyond the periphery of the board.
If a board laminated in this way is fed after a dividing saw to an edge-working machine, and if an edge is to be produced on this board by means OI a postforming method, in the case of the known process the ~hin lamina-tion of one face of the board is stripped by means of cutting. At the same time, along the board edge to be produced, a step-shaped stop is formed, which bounds a recess, into which subsequently a pre-profiled strip is glued, for example a strip of so-called ~medium density~-material. After gluing-in of this profiled strip, which already has a rounded-off edge, the laminating material of the board, previously stripped by cutting, is heated and bent around the profiled edge, in order to be subse-quently glued onto the edge of the board thus prepared.
The known process has the disadvantage tha~, as well as the preparation of the board edge, a filler strip also has to be glued onto the prepared edge, the strip to be glued on having to be produced on a separate machine.
~his fact leads to a considerable increase in the costs of creating a postforming edge on a laminated workpiece in board form.
Furthermore, it is necessary to provide in the edge-gluing machine used an additional apparatus for introducing the additional filler strip. Since the filler strip consists of different material to the chipboard, the s~rip is to be regarded as a foreign body which, in the event o moisture absorption of the finished-worked board, leads to diferent hygroscopic behavior in com-parison with the material of the board. There is conse-quently the risk of producing an irregular edge which has defects which are not acceptable for the finished pro-duct. It has also become known rom the prior art to - 3 ~3~3~
laminate workpieces in board form for the production of furniture ~long their narrow sides (edges) with the assistance of strips of plastic or natural veneer. These strips are glued onto the side faces of the workpiece in edge-gluing machines.
The known edge-gluing machines have prcved to be advantageous if flat edges which are arranged at an angle of 9~C with respect to the faces of the board are to be laminated. However, considerable disadvantages and difficulties have arisen in the attempt to employ these machin0s also for sheathing the edges by means of post-forming or softforming methods and, for this purpose, directly to use the laminating material which has previously been applied to the surface of the board.
A further object of the present invention is therefore to propose a process by which it is possible to avoid the disadvantages of the prior art and to create-the possibility of producing boards with a satisfactory postforming edge, using simple process steps, in parti-~Q cular without the necessity of providing an additional component in the form of a filler strip to be brought in separatel~.
It is also an object of the present invention to propose a corresponding machine with which it is possible to work a workpiece in board form, already laminated on ~he faces, in such a way that the possibility is created of using ~he laminating material of one face of the board al30 for continuously laminating tha assigned edge without interruption.
This o~ject is achieved according to the in~en-tion by a process wherein a) the edge of the board is ~rovided with at least one profile milling extending in the longitudinal direction, b) by cutting from the board, a stripping of one lamination of the board is performed, c) by further cutting from the body of the board, a wedge-shaped subpiece i5 freed, which is joined by its tip to the body of the board by means of the laminating material, _ 4 _ ~ 3~30 d) a gluing of the bounding walls of the hollow space worked into the body of the board is performed, e) a bending-off of the wedge-shaped subpieca toward the body of the board and a gluing of same onto the body of the board is performed, f) a trimming of the board edge thus created is per-formed and g) a bending-over of the previously stripped laminating material around the profiled edge and a gluing of the laminating material onto the edge are performed.
With a process of this type, various advantages are achived.
Thanks to the creation of a wedge-shaped body, which is subjected in a preceding work operation to a profiling for creating a rounded-off postforming edge, it is no longer necessary to bring in an additional filler strip.
By provision of the tip of the wedge-shaped subpiece in the direct vicinity of the lamination which covers one face of the board, the wedge-shaped subpiece remains constantly joined to the body of the board in the longitudinal direction and allows a controlled bending off of the wedge-shaped subpiece (similar to a film-hinge connection) in the direction of the body of the board in a second work operation, whereby the position of the wedge-shaped subpiece with respect to the body of the board is always precisely maintained.
By subsequent trimming of the postforming edge thus created, not only is the remaining lamination 3~ removed from the wedge-shaped subpiece, but a working of the edge in the vicinity of the bending point of hinge-like design is also performed, in order to make a satis-factorily worked face available for the subsequent postforming sheathing, a par~icular feature of said face being its homogeneous ma~erial composition and said face permitting the stripped lamination, protruding from the board, to be glued on in an automatic process and without working errors.
The machine suitable for carrying out the process _ 5 _ 2~313~
has a transporting mechanism for the advancing of the boards along a horizontal plane and is equipped with working and treating apparatuses in the following com-bination:
a) a trimming mechanism, b3 a milling mechanism, c) a scoring apparatus, d) a precision milling mechanism, e) a profile milling mechanism, f) a scoring apparatus, g) a milling apparatus, h) a scoring apparatus, i) a gluing apparatus, k) a bending and pressing appaxatus, 1) a trimming apparatus.
It is particularly advantageous for an appliance for thermally influencing ~he layer of glue to be pro--vided between the apparatus for applying the glue and a pressing apparatus, fitted with rollers.
With a machine designed in such a way and start-ing with a chipboard finished on both sides ~ith a lamination, for example with a melamine-resin l~mination, it is possible to produce a profiled edge, for example a softforming or postforming edge.
The layer of the decorative material of one face of the board is freed from the supporting material of the chipboard and, after that, a postforming or softforming edge is produced, onto which the laminating material pre-viously stripped and freed from the body of the chipboaxd is glued.
Thus, with the machine according to the inven-tion, the extremely brittle and sensitive laminating material is detached from the board just a few moments before creating the finished edge.
Further advantages of the invention can be taken from the following description, the dra~ings and the subclaims.
The process, the machine and the boards designed according to the invention are now described in greater 2~3~3~
detail and represented by means of an illustrative embodiment in the drawings, in which:
Fig. 1 shows in cross section the end piece of a work-piece in board form during preparation and working by cutting;
Fig. 2 shows the prepared workpiece in board form during the gluing operation;
Fig. 3 diagrammatically shows the bending-off operation, by which the wedge-shaped workpiece is bent around and glued onto the edge of the board;
Fig. 4 shows the trimming operation of the edges, Fig. 5 shows the bending operation of the laminating material during the sheathing of the edge by means of a postforming method; and ``
Fig. 6 shows the finished board with one or with two edges rounded-off and sheathed by the postforming method;
Fig. 7 shows in elevation the intake part of the machine according to the invention;
Fig. 8 shows the central part of the machine; and 2Q Fig. 9 shows the end piece of the machine according to the invention.
As Fig. 1 reveals, to carry out the process according to the present invention, use is made of a chipboard 1, which is provided on both sides with a lamination 2 and 3, for example a lamination of malamine resin or another plastics material.
The board 1 may also be laminated with natural veneer, in this case it would be appropriate to use a wood veneer, which allows a deformation by means of the postforming method. On the board edge to be sheaihed, a profiling 4, a shoulder 5 and a bevel 6 are produced by a first work operation by means of cutting.
After that, using a tool 7, which ro~ates about an inclined axis 7, a milled recess is produced, which extends from the outer side of ~he board to the interior of the board body 1.
~ he tool 7 is arranged and aligned in such a way that a wedge-shaped wedge piece 8 is freed from the board body 1. In this case, the wedge tip is arranged in the _ 7 _ ~ 3 a direct vicinity of the lamination 2. Coinciding with the wedge tLp 8, the lamination 2 may be provided with a scoring 9, which extends over the entire length of the board 1.
If it is desired to further increase the cutting quality, it is possible to use two separate tools 7 and 7a (Fig. 1). It could also be advantageous ~o carry out the beveling 4 as well as the milling operation with the tools 7 and 7a in a single working step, in which case combined tools or miller groups arranged in series would be recommendable.
With a second profiled tool 10, which is driven about an axis 10', the hollow recess 11 between the laminate 2 and the laminate 3 of the board body 1 is completed by cutting. ~s Fig. 1 reveals, this hollow recess 11 is bounded by an oblique plane 12, which on the undersi.de intersects with an inclined plane, which is-arr~nged in the opposite direction and runs out in the direct vicinity of the lamination 3.
As revealed in particular by Fig. 1, the tool 10 is set in su~h a way that a thin layer of the chip material 14 remains on the inside of the laminate 3; as a result the following gluing operation can be improved.
At the end of the previously described operations, the wedge-shaped subpiece 8 is easily raised and swung about the hin~e-like zone 9, as is indicated by the arrow f, in order in this way to make it easier to bring in the gluing appara~us 15 for applying the glue 16 to the faces bounding ~he hollow recess 11.
It can he seen from Fig. 2 that the apparatus 15 for applying the glue layer 16 is designed such ~hat no gluing of the lower side of the laminate 3 is perormed.
After applying the adhesive, the wedge-shaped subpiece 8 is bent off in the direction indicated by the arrow (g) and the bevel 6 is brought into effective connection with the bevel 13 as well as the fac~ 8~ of the wedge-shaped subpiece with the face 12~ which bounds the hollow recess 11 toward the chipboard 1. By applying a pressure P
(Fig. 4~, the wedge-shaped subpiece 8 is pressed onto and - 8 - 2 ~ ~ 3 glued onto the chipboard 1.
It can be seen from Fig. 4 tha-t, for removing the laminating material 2 remaining on the wedge-shaped subpiece 8, as well as for making good any unevennesses which may have formed on the hinge-like bending edge 9, as well as for leveling out the step 5 in front of the profiled edge 4, the board 1 is subjected to a trimming operation with the assistance of a sawing or milling tool 17.
In a final working operation, as represented in Fig. 5, after carrying out the preparation operation described, the edge 18 of the board 1 is provided in the usual way with a layer of glue and, after that, the plastic lamination 3, if necessary after appropriate heating, is bent off together with the thin chip layer 1~
in the direction of the arrow (i) onto the edge 18, in order to be glued to the latter.
In a known way, the remaining, protruding laminating material 3 is trimmed or, as shown diagram-matically in Fig. 6, used for sheathing a further roundededge 19, employing the postforming method.
~ ccording to the invention, no filler strip of a different type of mat~rial has to be used additionally for producing the rounded-off edge. Instead, a wedge-shaped subpiece is used, which in an advantageous way isworked directly out of the material o~ the chipboard and is integrally ~oined to the chi~board, by means of a type of hinge, during the entire working operation.
The wedge-shaped subpiece can be satisfactorily glued onto the body of the chipboard, without running the risk of openings or step-shaped shoulders being formed.
By means of a cutting form of working (milling tool 17), in a final working operation the chipboard is freed of any irregularities occurring, as well as of laminate remains. After that, it is possible for the laminating material which has been stripped from one side of the board to he glued onto the edge. In Figures 7, 8 and 9, the ~arious zones of the machina are shown in elevation, which in reality are to be regarded as a combined single 9 2~313~
machine body.
The machine comprises a frame 101, as well as an endless conveyor belt 102, as are known from conventional edge-gluing machines.
With the assistance of the conveyor belt 102, the workpieces in board form are conveyed in a hori~ontal plane through the machine 101 and the prerequisite is created for the edges (narrower side faces of the board) to be able to undergo working by mechanical apparatuses, as will be described in still further detail below.
For reasons of simplicity, a cross-section of the board 103 with the working tools which are in use has been represented in Fi~s. 7,8 and 9 above the various working apparatuses, this being to allow the various working operations in the machine 101 to be illustrated better.
When the board 103 is fed to the machine 101 in-the direction of the arrow (f), the edge of the board 103 is trimmed by means of a circular saw 105 in a first working apparatus 104. Consequently, the edge is prepared for the following working operations, since they require a board 103 with a satisfactorily trLmmed edge 106.
With the assistance of the following milling apparatus 107, a partial volume of the body of the board is cut from the chipboard 103 with the assistance of the tool 108 and a profiled subpiere, corresponding to the edge to be produced later, is created.
In the following working apparatus 109, a recess is created between the board body 103 and the lamination 111, for example a melamine-re~in lamination, with the assistance of a milling tool 110.
In ordar to free the melamine-resin lamination 111 as far as possible of remaining chip material of the board 103, as well as of remaining glue residue, a fine-3~ milling of the inner face of ~he thin lamination material 111 is performed in the following working mechanism with the assistance of a saw-like tool 113.
With the assistance of the following working apparatus 114, a milling tool 115 is used to give the ~ ~ L~ a remaining body of the chipboard 103 a suitable profile for the following working operations.
In the next working unit 116, with the assistance of a thin saw blade 117, for example a circular saw blade, a relatively thin incision is worked into the profile piece of the board 103 and, in the following working unit 117, with the assistance of a milling tool 118, the core piece of the board body 103, which has been freed by the preceding working using the circular saw blade 117, is removed.
Finally, using the apparatus ll9 and employing a thin circular saw blade 120, the laminating material 121 is scored, which leads to the creation of a precisely fixed bending line.
The scoring apparatus 119 is followed by a gluing apparatus 122, in which, using a nozzle 123, a layer of glue is applied to the edge of the workpiece 103 in board form, bounded by the layers 111 and 121.
It has proved to be advantageous to provide a heating element 124 after the gluing apparatus 122, which heating element is equipped for example with infrared lamps, by means of which the layer of glue previously applied, using the apparatus 1~2, 123, is brought to the necessary processing temperature.
After the heating element 124, a bending and pressing apparatus, equipped with rollers 125, is arranged in the machine. The rollers, provided in such a manner that they can be set in their position with respect to the workpiece, act on the protruding subpiece 121 and bend the subpiece 121 o onto the edg~ 103~
previously provided with a layer of glue. Aftex the apparatus 125, provided with bending and pressing rollers, a further working unit 126 is provided, in which the lamination 121, consisting of melamine resin, is removed from the edse of the chipboard 103 by means of employing a milling tool 127. Ater that, the board 103 with appropriately profiled edge with a freely protruding laminating strip o melamine resin is fed to an edge-gluing apparatus, in which the melamine-resin strip 111 11 2~ 3~
is bent around and glued onto the profiled edge, which has been produced as described.
The advantage of the machine 101 according to the invention is to be seen in that it makes it possible to prepare the edge of a chipboard 103 in such a way that the laminating strip lll of a surface of the board 103 can be used for the continuous sheathing of a postforming or softforming edge.
It is particularly advantageous if the layer of the chipboard which is made very uniformly and with high density, that is to say the hardest layer of the chip-board, i5 ~oined to the edge of the compone.nt in board form and serves in an advantageous way for receiving the laminating material.
G. ~tefani S.p.A.
Thiene (Italy) A process and a machine for producing a component in board form having a postforming edge, as well as a board produced by this process The present invention relates to a process for producing a workpiece in board form having a so-called postforming edge. The invention relates ~urthermore to a board produced by this process. The present invention also relates to a machine ~or sheathing the edges of workpieces in board form, which are used for the produc-tion of furniture and with which the laminating material of one ace of the workpiece in board form is used for the sheathing of the edge. It is known from the prior art to provide chipboards for the furniture industry with a-l~mination on both faces, for e~ample with natural wood veneer.
Often, the ~inishing layer for workpieces in board ~orm consists of synthetically produced material, for example a melamine lamination or a thermoplastic material.
These plastic laminations are glued onto the faces of the supporting board with the assistance of large presses.
Wherever it is desired to lend the Pdges of the b~ard rounded-off lengthwise profiling~, in order for example to create rounded-of~ edges, with the assist~nce of the so-called postforming technique, it is necessary to allow the laminating material ~or the production o a post~orming edge, applied in the press, to protrude by a few centimeters ~rom the surface o~ the supporting board laminated in the press.
If it is assumed that the laminating material applied in the plate presses has to be mada very thin and, besides, is also very brittle, it is understandable that the necessity to leave an unp~otected strip o~ the laminating material pro~ruding ~rom the board running out of the press leads to considerable difficulties, whether during transport or during storage of the board.
In order to avoid these disadvantages, it has become known from the prior art to use a process in which the body of the board is laminated on both faces with a lamina-te which does not project beyond the periphery of the board.
If a board laminated in this way is fed after a dividing saw to an edge-working machine, and if an edge is to be produced on this board by means OI a postforming method, in the case of the known process the ~hin lamina-tion of one face of the board is stripped by means of cutting. At the same time, along the board edge to be produced, a step-shaped stop is formed, which bounds a recess, into which subsequently a pre-profiled strip is glued, for example a strip of so-called ~medium density~-material. After gluing-in of this profiled strip, which already has a rounded-off edge, the laminating material of the board, previously stripped by cutting, is heated and bent around the profiled edge, in order to be subse-quently glued onto the edge of the board thus prepared.
The known process has the disadvantage tha~, as well as the preparation of the board edge, a filler strip also has to be glued onto the prepared edge, the strip to be glued on having to be produced on a separate machine.
~his fact leads to a considerable increase in the costs of creating a postforming edge on a laminated workpiece in board form.
Furthermore, it is necessary to provide in the edge-gluing machine used an additional apparatus for introducing the additional filler strip. Since the filler strip consists of different material to the chipboard, the s~rip is to be regarded as a foreign body which, in the event o moisture absorption of the finished-worked board, leads to diferent hygroscopic behavior in com-parison with the material of the board. There is conse-quently the risk of producing an irregular edge which has defects which are not acceptable for the finished pro-duct. It has also become known rom the prior art to - 3 ~3~3~
laminate workpieces in board form for the production of furniture ~long their narrow sides (edges) with the assistance of strips of plastic or natural veneer. These strips are glued onto the side faces of the workpiece in edge-gluing machines.
The known edge-gluing machines have prcved to be advantageous if flat edges which are arranged at an angle of 9~C with respect to the faces of the board are to be laminated. However, considerable disadvantages and difficulties have arisen in the attempt to employ these machin0s also for sheathing the edges by means of post-forming or softforming methods and, for this purpose, directly to use the laminating material which has previously been applied to the surface of the board.
A further object of the present invention is therefore to propose a process by which it is possible to avoid the disadvantages of the prior art and to create-the possibility of producing boards with a satisfactory postforming edge, using simple process steps, in parti-~Q cular without the necessity of providing an additional component in the form of a filler strip to be brought in separatel~.
It is also an object of the present invention to propose a corresponding machine with which it is possible to work a workpiece in board form, already laminated on ~he faces, in such a way that the possibility is created of using ~he laminating material of one face of the board al30 for continuously laminating tha assigned edge without interruption.
This o~ject is achieved according to the in~en-tion by a process wherein a) the edge of the board is ~rovided with at least one profile milling extending in the longitudinal direction, b) by cutting from the board, a stripping of one lamination of the board is performed, c) by further cutting from the body of the board, a wedge-shaped subpiece i5 freed, which is joined by its tip to the body of the board by means of the laminating material, _ 4 _ ~ 3~30 d) a gluing of the bounding walls of the hollow space worked into the body of the board is performed, e) a bending-off of the wedge-shaped subpieca toward the body of the board and a gluing of same onto the body of the board is performed, f) a trimming of the board edge thus created is per-formed and g) a bending-over of the previously stripped laminating material around the profiled edge and a gluing of the laminating material onto the edge are performed.
With a process of this type, various advantages are achived.
Thanks to the creation of a wedge-shaped body, which is subjected in a preceding work operation to a profiling for creating a rounded-off postforming edge, it is no longer necessary to bring in an additional filler strip.
By provision of the tip of the wedge-shaped subpiece in the direct vicinity of the lamination which covers one face of the board, the wedge-shaped subpiece remains constantly joined to the body of the board in the longitudinal direction and allows a controlled bending off of the wedge-shaped subpiece (similar to a film-hinge connection) in the direction of the body of the board in a second work operation, whereby the position of the wedge-shaped subpiece with respect to the body of the board is always precisely maintained.
By subsequent trimming of the postforming edge thus created, not only is the remaining lamination 3~ removed from the wedge-shaped subpiece, but a working of the edge in the vicinity of the bending point of hinge-like design is also performed, in order to make a satis-factorily worked face available for the subsequent postforming sheathing, a par~icular feature of said face being its homogeneous ma~erial composition and said face permitting the stripped lamination, protruding from the board, to be glued on in an automatic process and without working errors.
The machine suitable for carrying out the process _ 5 _ 2~313~
has a transporting mechanism for the advancing of the boards along a horizontal plane and is equipped with working and treating apparatuses in the following com-bination:
a) a trimming mechanism, b3 a milling mechanism, c) a scoring apparatus, d) a precision milling mechanism, e) a profile milling mechanism, f) a scoring apparatus, g) a milling apparatus, h) a scoring apparatus, i) a gluing apparatus, k) a bending and pressing appaxatus, 1) a trimming apparatus.
It is particularly advantageous for an appliance for thermally influencing ~he layer of glue to be pro--vided between the apparatus for applying the glue and a pressing apparatus, fitted with rollers.
With a machine designed in such a way and start-ing with a chipboard finished on both sides ~ith a lamination, for example with a melamine-resin l~mination, it is possible to produce a profiled edge, for example a softforming or postforming edge.
The layer of the decorative material of one face of the board is freed from the supporting material of the chipboard and, after that, a postforming or softforming edge is produced, onto which the laminating material pre-viously stripped and freed from the body of the chipboaxd is glued.
Thus, with the machine according to the inven-tion, the extremely brittle and sensitive laminating material is detached from the board just a few moments before creating the finished edge.
Further advantages of the invention can be taken from the following description, the dra~ings and the subclaims.
The process, the machine and the boards designed according to the invention are now described in greater 2~3~3~
detail and represented by means of an illustrative embodiment in the drawings, in which:
Fig. 1 shows in cross section the end piece of a work-piece in board form during preparation and working by cutting;
Fig. 2 shows the prepared workpiece in board form during the gluing operation;
Fig. 3 diagrammatically shows the bending-off operation, by which the wedge-shaped workpiece is bent around and glued onto the edge of the board;
Fig. 4 shows the trimming operation of the edges, Fig. 5 shows the bending operation of the laminating material during the sheathing of the edge by means of a postforming method; and ``
Fig. 6 shows the finished board with one or with two edges rounded-off and sheathed by the postforming method;
Fig. 7 shows in elevation the intake part of the machine according to the invention;
Fig. 8 shows the central part of the machine; and 2Q Fig. 9 shows the end piece of the machine according to the invention.
As Fig. 1 reveals, to carry out the process according to the present invention, use is made of a chipboard 1, which is provided on both sides with a lamination 2 and 3, for example a lamination of malamine resin or another plastics material.
The board 1 may also be laminated with natural veneer, in this case it would be appropriate to use a wood veneer, which allows a deformation by means of the postforming method. On the board edge to be sheaihed, a profiling 4, a shoulder 5 and a bevel 6 are produced by a first work operation by means of cutting.
After that, using a tool 7, which ro~ates about an inclined axis 7, a milled recess is produced, which extends from the outer side of ~he board to the interior of the board body 1.
~ he tool 7 is arranged and aligned in such a way that a wedge-shaped wedge piece 8 is freed from the board body 1. In this case, the wedge tip is arranged in the _ 7 _ ~ 3 a direct vicinity of the lamination 2. Coinciding with the wedge tLp 8, the lamination 2 may be provided with a scoring 9, which extends over the entire length of the board 1.
If it is desired to further increase the cutting quality, it is possible to use two separate tools 7 and 7a (Fig. 1). It could also be advantageous ~o carry out the beveling 4 as well as the milling operation with the tools 7 and 7a in a single working step, in which case combined tools or miller groups arranged in series would be recommendable.
With a second profiled tool 10, which is driven about an axis 10', the hollow recess 11 between the laminate 2 and the laminate 3 of the board body 1 is completed by cutting. ~s Fig. 1 reveals, this hollow recess 11 is bounded by an oblique plane 12, which on the undersi.de intersects with an inclined plane, which is-arr~nged in the opposite direction and runs out in the direct vicinity of the lamination 3.
As revealed in particular by Fig. 1, the tool 10 is set in su~h a way that a thin layer of the chip material 14 remains on the inside of the laminate 3; as a result the following gluing operation can be improved.
At the end of the previously described operations, the wedge-shaped subpiece 8 is easily raised and swung about the hin~e-like zone 9, as is indicated by the arrow f, in order in this way to make it easier to bring in the gluing appara~us 15 for applying the glue 16 to the faces bounding ~he hollow recess 11.
It can he seen from Fig. 2 that the apparatus 15 for applying the glue layer 16 is designed such ~hat no gluing of the lower side of the laminate 3 is perormed.
After applying the adhesive, the wedge-shaped subpiece 8 is bent off in the direction indicated by the arrow (g) and the bevel 6 is brought into effective connection with the bevel 13 as well as the fac~ 8~ of the wedge-shaped subpiece with the face 12~ which bounds the hollow recess 11 toward the chipboard 1. By applying a pressure P
(Fig. 4~, the wedge-shaped subpiece 8 is pressed onto and - 8 - 2 ~ ~ 3 glued onto the chipboard 1.
It can be seen from Fig. 4 tha-t, for removing the laminating material 2 remaining on the wedge-shaped subpiece 8, as well as for making good any unevennesses which may have formed on the hinge-like bending edge 9, as well as for leveling out the step 5 in front of the profiled edge 4, the board 1 is subjected to a trimming operation with the assistance of a sawing or milling tool 17.
In a final working operation, as represented in Fig. 5, after carrying out the preparation operation described, the edge 18 of the board 1 is provided in the usual way with a layer of glue and, after that, the plastic lamination 3, if necessary after appropriate heating, is bent off together with the thin chip layer 1~
in the direction of the arrow (i) onto the edge 18, in order to be glued to the latter.
In a known way, the remaining, protruding laminating material 3 is trimmed or, as shown diagram-matically in Fig. 6, used for sheathing a further roundededge 19, employing the postforming method.
~ ccording to the invention, no filler strip of a different type of mat~rial has to be used additionally for producing the rounded-off edge. Instead, a wedge-shaped subpiece is used, which in an advantageous way isworked directly out of the material o~ the chipboard and is integrally ~oined to the chi~board, by means of a type of hinge, during the entire working operation.
The wedge-shaped subpiece can be satisfactorily glued onto the body of the chipboard, without running the risk of openings or step-shaped shoulders being formed.
By means of a cutting form of working (milling tool 17), in a final working operation the chipboard is freed of any irregularities occurring, as well as of laminate remains. After that, it is possible for the laminating material which has been stripped from one side of the board to he glued onto the edge. In Figures 7, 8 and 9, the ~arious zones of the machina are shown in elevation, which in reality are to be regarded as a combined single 9 2~313~
machine body.
The machine comprises a frame 101, as well as an endless conveyor belt 102, as are known from conventional edge-gluing machines.
With the assistance of the conveyor belt 102, the workpieces in board form are conveyed in a hori~ontal plane through the machine 101 and the prerequisite is created for the edges (narrower side faces of the board) to be able to undergo working by mechanical apparatuses, as will be described in still further detail below.
For reasons of simplicity, a cross-section of the board 103 with the working tools which are in use has been represented in Fi~s. 7,8 and 9 above the various working apparatuses, this being to allow the various working operations in the machine 101 to be illustrated better.
When the board 103 is fed to the machine 101 in-the direction of the arrow (f), the edge of the board 103 is trimmed by means of a circular saw 105 in a first working apparatus 104. Consequently, the edge is prepared for the following working operations, since they require a board 103 with a satisfactorily trLmmed edge 106.
With the assistance of the following milling apparatus 107, a partial volume of the body of the board is cut from the chipboard 103 with the assistance of the tool 108 and a profiled subpiere, corresponding to the edge to be produced later, is created.
In the following working apparatus 109, a recess is created between the board body 103 and the lamination 111, for example a melamine-re~in lamination, with the assistance of a milling tool 110.
In ordar to free the melamine-resin lamination 111 as far as possible of remaining chip material of the board 103, as well as of remaining glue residue, a fine-3~ milling of the inner face of ~he thin lamination material 111 is performed in the following working mechanism with the assistance of a saw-like tool 113.
With the assistance of the following working apparatus 114, a milling tool 115 is used to give the ~ ~ L~ a remaining body of the chipboard 103 a suitable profile for the following working operations.
In the next working unit 116, with the assistance of a thin saw blade 117, for example a circular saw blade, a relatively thin incision is worked into the profile piece of the board 103 and, in the following working unit 117, with the assistance of a milling tool 118, the core piece of the board body 103, which has been freed by the preceding working using the circular saw blade 117, is removed.
Finally, using the apparatus ll9 and employing a thin circular saw blade 120, the laminating material 121 is scored, which leads to the creation of a precisely fixed bending line.
The scoring apparatus 119 is followed by a gluing apparatus 122, in which, using a nozzle 123, a layer of glue is applied to the edge of the workpiece 103 in board form, bounded by the layers 111 and 121.
It has proved to be advantageous to provide a heating element 124 after the gluing apparatus 122, which heating element is equipped for example with infrared lamps, by means of which the layer of glue previously applied, using the apparatus 1~2, 123, is brought to the necessary processing temperature.
After the heating element 124, a bending and pressing apparatus, equipped with rollers 125, is arranged in the machine. The rollers, provided in such a manner that they can be set in their position with respect to the workpiece, act on the protruding subpiece 121 and bend the subpiece 121 o onto the edg~ 103~
previously provided with a layer of glue. Aftex the apparatus 125, provided with bending and pressing rollers, a further working unit 126 is provided, in which the lamination 121, consisting of melamine resin, is removed from the edse of the chipboard 103 by means of employing a milling tool 127. Ater that, the board 103 with appropriately profiled edge with a freely protruding laminating strip o melamine resin is fed to an edge-gluing apparatus, in which the melamine-resin strip 111 11 2~ 3~
is bent around and glued onto the profiled edge, which has been produced as described.
The advantage of the machine 101 according to the invention is to be seen in that it makes it possible to prepare the edge of a chipboard 103 in such a way that the laminating strip lll of a surface of the board 103 can be used for the continuous sheathing of a postforming or softforming edge.
It is particularly advantageous if the layer of the chipboard which is made very uniformly and with high density, that is to say the hardest layer of the chip-board, i5 ~oined to the edge of the compone.nt in board form and serves in an advantageous way for receiving the laminating material.
Claims (12)
1. A process for producing a workpiece in board form for the production of furniture with postforming edges, wherein a) the edge of the board is provided with at least one profile milling (4), extending in the longitudinal direc-tion, b) by cutting from the board (1), a stripping of a lamination (3) of the board is performed, c) by further cutting from the body of the board, a wedge-shaped subpiece (8) is freed, which is joined by its tip to the board body (l), by means of the laminating material (2), d) a gluing of the bounding walls of the hollow space worked into the board body (1) is performed, e) a bending-off of the wedge-shaped subpiece (8) toward the board body (1) and a gluing of same onto the-board body is performed, f) a trimming of the board edge (2,5) thus created is performed and g) a bending-over of the previously stripped laminating material around the profiled edge and a gluing of the laminating material onto this edge are performed.
2. The process as claimed in patent claim 1, wherein a stopping step (5) is formed between the profiling (4), provided on the board edge (1), and the lamination (2).
3. The process as claimed in patent claim 1, wherein the laminating material (2) is scored (9) in the longi-tudinal direction in the vicinity of the wedge tip (8).
4. The process as claimed in patent claim 1, wherein the faces (12, 13) which bound the hollow space (11) are bounded by a first inclined plane (12), which runs together with a plane (13) which extends in the opposite direction, and wherein the inner faces of the wedge-shaped subpiece (8) come into connection with the two planes (12, 13) after carrying out the bending operation.
5. The process as claimed in patent claim 1, wherein the production of the profiled edge (4), as well as the cutting for stripping the lamination (3) from the body of the board are performed in a single work operation.
6. The process as claimed in patent claim 1, wherein the production of the wedge-shaped subpiece (8) is performed using two, combined milling tools.
7. A board for the production of items of furniture with postforming edge, produced by the process as claimed in claim 1.
8. The board for the production of furniture with postforming edge, as claimed in patent claim 7, wherein the wedge-shaped subpiece (8) is worked out from the body of the board and consists of the material of the board body (1).
9. The board as claimed in patent claim 7, wherein the wedge-shaped subpiece (8) is permanently joined to the board body (1) during the cutting working of the latter.
10. A machine for producing a laminated edge of a-workpiece in board form, using the laminating material applied to the surface of the board, having an endless conveying means for advancing the board in a horizontally arranged plane, as claimed in patent claim 1, wherein mechanisms for working the board are provided in combina-tion along the advancing plane of the board, comprising:
a) a trimming apparatus (104, 105);
b) a milling apparatus (107, 108);
c) a scoring apparatus (109, 110);
d) a precision milling apparatus (112, 113);
e) a profile milling mechanism (114, 115);
f) a scoring apparatus (116, 117);
g) a milling apparatus (117, 118);
h) a scoring apparatus (119, 120);
i) a gluing apparatus (122, 123);
k) a banding and pressing apparatus (125);
l) a trimming apparatus (126, 127).
a) a trimming apparatus (104, 105);
b) a milling apparatus (107, 108);
c) a scoring apparatus (109, 110);
d) a precision milling apparatus (112, 113);
e) a profile milling mechanism (114, 115);
f) a scoring apparatus (116, 117);
g) a milling apparatus (117, 118);
h) a scoring apparatus (119, 120);
i) a gluing apparatus (122, 123);
k) a banding and pressing apparatus (125);
l) a trimming apparatus (126, 127).
11. The machine as claimed in patent claim 10, wherein a mechanism for thermally treating the layer of glue is provided between the working apparatus (122, 123) for applying an adhesive and the pressing apparatus (125), equipped with rollers.
12. A machine as claimed in patent claim 10, wherein the machine is preceded by an edge-gluing apparatus for producing postforming or softforming edges.
BM/ht
BM/ht
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT20402A/90 | 1990-05-23 | ||
| IT02040290A IT1248803B (en) | 1990-05-23 | 1990-05-23 | Process for producing a panel with a postformed edge and panel produced in this way |
| ITMI91A-001132 | 1991-04-24 | ||
| ITMI911132A IT1247515B (en) | 1991-04-24 | 1991-04-24 | Machine for producing a covered edge on a board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2043130A1 true CA2043130A1 (en) | 1991-11-24 |
Family
ID=26327515
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2043130 Abandoned CA2043130A1 (en) | 1990-05-23 | 1991-05-23 | Process and a machine for producing a component in board form having a postforming edge, as well as a board produced by this process |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0458242A1 (en) |
| CA (1) | CA2043130A1 (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE9114920U1 (en) * | 1991-12-02 | 1993-02-04 | Dreer, Franz, 86825 Bad Wörishofen | Plate with postforming edge |
| GB2291582B (en) * | 1994-07-20 | 1997-12-24 | Orama Fabrications Ltd | Work surfaces |
| DE19806234A1 (en) * | 1998-02-16 | 1999-08-19 | Thermopal Dekorplatten Gmbh & | Process for producing a profile on an outer edge of a composite panel |
| US6340044B1 (en) | 1999-05-24 | 2002-01-22 | Premark Rwp Holdings, Inc. | Method and apparatus for the manufacture of beveled edge molding |
| DE10210605B4 (en) * | 2002-03-11 | 2004-02-19 | Westag & Getalit Ag | Postforming process for coating the narrow sides of plate-shaped workpieces |
| BE1015825A5 (en) * | 2003-12-18 | 2005-09-06 | Flooring Ind Ltd | Plinth, FLOORING SYSTEM AND METHOD FOR MANUFACTURING A Plinth. |
| DE102004053881B4 (en) * | 2004-11-04 | 2008-11-13 | Ima Klessmann Gmbh Holzbearbeitungssysteme | Method for producing formatted lightweight panels |
| DE202015101541U1 (en) * | 2015-03-19 | 2015-05-05 | Guido Schulte | Mechanical connection for panels |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH422304A (en) * | 1964-07-09 | 1966-10-15 | Tepar Ag | Process for the all-round coating of packaging material |
| FR1530769A (en) * | 1967-06-16 | 1968-06-28 | Tecora | Manufacturing process for trays and panels covered with laminated plastic plates |
| DE2234902A1 (en) * | 1972-07-15 | 1974-01-31 | Boettcher & Gessner | METHOD AND DEVICE FOR EDGE PROCESSING AND COATING ON PANEL-SHAPED WORKPIECES |
| CH565025A5 (en) * | 1974-04-09 | 1975-08-15 | Fischer Ag Brugg Georg | Plastic film coating plant - for wood or wood product profiles |
| DE3041870A1 (en) * | 1980-11-06 | 1982-06-09 | Wilhelm Lehbrink Gmbh & Co Kg, 4811 Oerlinghausen | Folded timber panel construction - has groove pressed into veneer opposite to and previous to cutting of mitre joint |
-
1991
- 1991-05-21 EP EP91108143A patent/EP0458242A1/en not_active Withdrawn
- 1991-05-23 CA CA 2043130 patent/CA2043130A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| EP0458242A1 (en) | 1991-11-27 |
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