FR2719252A1 - Method of manufacture of wooden floor blocks - Google Patents

Abstract

The method of manufacture uses a support bed with a machining surface bed adhered to it. A beam (1) is connected by sticking and compression to a number of rough parts in the wood of the worn surface.The beam is divided by sawing into a number of panels. The individual panels are stuck to the support bed to form a flooring panel having tongue and groove edges, and the ends are fixed together conventionally.

Description

Method of manufacturing parquet boards.

  The present invention relates to a method of manufacturing parquet planks comprising at least one support layer and a wear surface layer bonded thereto and having the desired lamellar pattern. A parquet board or a parquet board is a name established in the

  trade to designate lamellar floors.

  io In the known processes for manufacturing parquet boards, the wear surface strips in precious wood species, such as oak, are glued

  on a cheap wooden support or panel in a plan press.

  The decorative wear surface made of wear-resistant wood is glued in the form of loose strips on a support in thermal or high-frequency plate presses, the strips being applied to the support in the form of drawings using molds or other means. The supports are made of particle board or other wood fiber panels, veneers or other support woods, most often coniferous, which do not have defects reducing the resistance. Used as a support, the veneers or the wood are glued at the same time, transversely to the wear surface, in the aforementioned press, to form a panel of three or five layers, which is then detached into parquet strips of three layers in the case of a panel cut by a multi-tool circular saw or a panel in five layers, using a band saw, the parquet boards then being provided with pins and notches at the ends and tongues and grooves at the sides. The most common parquet planks comprise three or four lines of adjacent planks, the typical thickness of the wear surface being approximately 3 to 5 mm. 3o In all these known methods, the lamellae of the wear surface are produced by sawing blanks using circular saws first, and are then classified one by one in the drawing shapes. From sawing, thin corners and other cracks are produced in the individual lamellae, and when transferring surfaces to the lamellar designs from shapes to supports, offsets and other defects are

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  products, requiring painful corrections after gluing, or even the rejection of whole boards. In addition to the drawbacks due to the transfer operations described above, the classification and installation of the individual slats are procedures which require a lot of manpower and apparatuses in themselves. In parquet boards, the wood fibers of the wear surface are usually oriented in the longitudinal direction of the board, but parquet boards are also known in which the wood fibers of the wear surface are perpendicular to the surface of the blade. In this case, the wear resistance of the parquet floor is multiple compared to that

an ordinary parquet strip.

  The invention proposes to implement a method of manufacturing parquet boards which overcomes the drawbacks of the aforementioned manufacturing methods while eliminating the aforementioned defects, due to the treatment of the slats.

  wear surface, and reducing labor and material costs.

  These aims were achieved by the manufacturing method according to the invention, of which

  ) the main features are presented in claim 1 below

  attached. The invention is based on the idea of gluing the wooden blanks of wear surface and compressing them into glued beams, which are then cut, for example using a band saw, into panels wear surface, which, on the other hand, are glued to the support to form a parquet strip panel. This panel is then cut in a manner known per se, for example using a rotary saw with multiple tools, into parquet strips, the sides of which are provided with tongues and grooves and the ends

  pins and notches or the like.

  In the solution according to the invention, the wear surface is produced in the form of a panel in the manner presented above before being applied to the support, which makes it possible to eliminate the thinned corners and the other defects 3 in the material of the wear surface linked to sawing known manufacturing processes, and to avoid transfers to the support of the highly heterogeneous detached lamellar designs, thus making it possible to obtain a reduction

  significant labor and material costs.

  According to a preferred embodiment, the blanks, whose length and thickness equal the length and width of the finished parquet strip, are glued flat and at the ends in a beam press, also comprising an abutment compression , to form a glued beam whose thickness equals the width of the blanks, thus producing wood fibers in the wear surface layer of the finished parquet strip oriented in the direction

longitudinal of the blade.

  According to another embodiment, the blanks, whose width and thickness equal the length and width of the strips of the finished parquet strip, are glued to the wide and thin sides in a beam press, also comprising compression at the end, to form a glued beam whose thickness equals the length of the blanks, the wood fibers in the wear surface layer of the finished parquet strip then being perpendicular to the surface of the blade. Such a finger-jointed parquet floorboard has multiple wear resistance compared to

  parquet with wood fibers running in the longitudinal direction of the board.

  According to yet another preferred embodiment, in the step of gluing the glued beam, lower quality planks are inserted between the sets of adjacent blanks, equal to the width of the finished parquet plank,

  in order to obtain a sawing gap and to allow machining.

  According to the invention, the support layer is preferably produced in a manner analogous to that of the wear surface layer, that is to say that the blanks of support wood, most often of the conifer, are glued and pressed into a glued beam, which is then cut by a band saw into support panels, which are cross-glued to the panels of the wear surface, to form panels of parquet boards in three or in

preferably five coats.

  The invention will be described in detail below with reference to the accompanying drawing, in which

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  Figure 1 is a top view of a glued beam manufactured as an intermediate product according to the invention, Figure 2 shows a side view of the same construction as Figure 1, Figure 3 and a vertical sectional view of a parquet plank panel manufactured according to the invention, Figure 4 is a vertical sectional view of another parquet plank panel manufactured according to the invention, and Figure 5 shows a top view of a glued beam made as

  intermediate product according to the invention.

  Sketches 2 are produced in the material of the wear surface, such as oak, by sawing and planing. In Figures 1 and 2, the outline shows the

  length a, thickness b and width c.

  A determined number of sets of blanks, for example four, are introduced into the beam press, planks 3 of support wood having been inserted between these sets for sawing and machining. Each of the sets of blanks comprises a determined number of rows of blanks, for example three. The glued beam 1 is compressed in the press, which also includes butt compression to join the ends subjected to precision sawing. In the exemplified case, the beam has a height of 4 x (180 mm + 0.5 to 0.6 mm) = 740 to 744 mm, the thickness b of the blank is the width of the strip being 60 mm and

  the thickness of the supporting wooden board being 5 to 6 mm.

  The glued beam 1 thus produced is cut using a band saw into several panels 5 or 10 of wear surface, the thickness of which is for example approximately 5 mm during the manufacture of panels of parquet boards 4 in three layers, or approximately 11.5 mm (2 x 5 mm + approximately 1.5 mm, sawing gap required for the band saw) when manufacturing panels

parquet boards 9 in five layers.

  The support wood panels 6 and 7 are produced in a manner analogous to the wear surface panel by bonding and compression in the press of beams of support wood blanks, for example conifer, to form a beam glued, which is then cut using a band saw in

  panels having for example a thickness of about 5 mm.

  The wearing surface panels 5 (FIG. 3) or 10 (FIG. 4), the central glued panels 6 and the counter-panels 7 are assembled in the same way as gluing the plywoods in three or five layer assemblies, which can be introduced directly into the hot press, or else subjected to preparative compression in the form of a stack before introduction into the hot press, in the same way as for making plywood. In this case, an adhesive suitable for primary compression of the phenol-recorcinol type must be used. The three or five layer assembly subjected to preparative compression promotes an impeccable supply in the hot press, and, with a view to relay operation of the hot press, the main team can perform the preparatory compression of the assemblies for the evening and even the night team, like gluing plywood. a heat press with appropriate feed and discharge devices requires only one operator. The hot press being in particular the most expensive machine in the production of a laminate parquet, additional capacity is obtained by adding less expensive machines if necessary and by operating the hot press in two or three teams. When gluing a laminate parquet panel 9 in five layers, the panel of the wear surface 10 must be twice the thickness of the final wear surface of the blade, plus the sawing gap required for the band saw,

  also taking into account the margin for rectification.

  3 (One or both ends of the central glued panel 6 (Figure 3) may be provided with a panel end 8 having a direction of fibers parallel to that of the wear surface 5. These ends 8 having an orientation fibers parallel to the longitudinal direction of the plank are required for the machining of pins and notches in the ends of the detached parquet planks

parquet plank panel 4.

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  Finally, the parquet plank panel 4 in three layers is cut flat into parquet planks in the longitudinal direction, using a multi-tool circular saw, and the parquet plank panel 9 in five layers is in addition split in the center by a band saw into strips of parquet three layers. The parquet boards thus obtained are provided with pins and

  notches at the ends and tongues and grooves at the sides.

  The consumption of material for the quality of parquet described above is estimated as follows per 100 m2 of finished parquet strip: - wood blanks with a chamfered wear surface 1.0 m3 - support wood with a rotten edge and defective was eliminated, 2.0 m3 - glue for hot press 9 kg (100% dry) The method according to the invention also allows the production of parquet boards having a butted wooden wear surface, ie a orientation of the surface wood fibers perpendicular to the plane of the plank (see Figure 5). Roughs 12 are produced by sawing and planing in surface wood, such as oak. In a manner analogous to the case described above, a determined number of sets of blanks, for example four, is introduced into the beam press, blades 13 of supporting wood having been inserted between the sets of blanks . Each of the sets of blanks comprises a determined number of rows of blanks, for example two. The gummed beam is compressed in the press to form a glued beam 11. This glued beam is then subjected to an additional treatment of

  similar to that described above with reference to Figures 1 to 4.

Claims (4)

  1. A method for manufacturing parquet planks comprising at least one support layer (6, 7) and a wear surface layer (5, 10) bonded thereto, having the desired lamellar pattern, characterized in that that a glued beam (1, 11) is produced by gluing and compression from a plurality of wooden blanks (2, 12) of the wear surface, the glued beam having a thickness c multiple to that of the layer of the wear surface (5, 10), the glued beam (1, 11) then being divided by sawing into a plurality of wear surface panels (5, 10) of the desired thickness, the panels individual then being glued to the support layer (6) to form a panel of parquet boards (4, 9), which is sawn into parquet boards, the sides and ends of which are optionally provided with tongues and grooves or means   similar fasteners in a manner known per se.   2. Method according to claim 1, characterized in that the aforementioned blanks (2), the length a and the thickness b equal the length and the thickness of the strips of the finished parquet strip, are stuck flat and at the ends in a beam press, also comprising an abutment compression, to form a glued beam (1), whose thickness equals the width c of the blanks, the wood fibers in the wear surface layer of the blade   of finished parquet being oriented in the longitudinal direction of the plank.   3. Method according to claim 1, characterized in that the aforementioned blanks (12), whose thickness and width equal the length and width of the strips of the finished parquet strip, are glued by the wide and thin sides in a beam press also comprising an abutment compression, to form a glued beam (11), the thickness of which equals the length of the blanks, the wood fibers in the wear surface layer of the blade   of finished parquet being perpendicular to the surface of the plank.   4. Method according to any one of the preceding claims,   characterized in that, during the gluing step of the glued beam (1, 11), boards (3, 13) of lower quality are interposed between the sets of blanks equal to the width of the parquet strip finished, in order to obtain a   sawing gap and allow machining.