FI95008C - Method for making parquet boards - Google Patents

Description

95008

The present invention relates to a method for producing parquet boards comprising at least one base layer and a tread layer glued thereon with a desired louvre pattern.

10 Parquet board, or parquet board, is an established name for lamellar or slatted floor boards for commercial use.

In known methods of manufacturing parquet boards, tread slats made of valuable wood, usually hardwood, such as oak, are glued in a flat press to a base or other board made of cheap wood. In this case, the decorative tread made of wear-resistant wood species is glued in loose slats, i.e. lamella slabs, in hot plate or high-frequency heated presses 20 to the substrate to which the the lamellae fitted to the patterns are moved using molds or other aids. The substrates are finished chipboard or other wood fiber-based board, veneers or other so-called undergrowth, most commonly coniferous, with no defects that impair strength. When using veneer or 25 wood as a substrate, it is glued to the in the presses crosswise with the tread simultaneously into either a 3- or 5-layer board, which after gluing is then broken up into 3-layer parquet boards, in the case of a multi-blade and 5-layer board, also using a band-splitting saw, which are then provided with pins and grooves at the ends and pages in languages and ponts. The most common parquet boards contain three or four rows of slats arranged side by side and the typical thickness of the tread is about 3-5 mm.

35 In all these known methods, the tread slats are sawn mainly with circular saws from blanks and processed individually by sorting and putting into patterns. Already when sawing, thin corners and 2 95008 other breaks appear in the individual slats, and when moving the patterned slatted surfaces from the molds to the substrates, their displacements and other irregularities occur, which then have to be laboriously repaired and even discarded. In addition to the disadvantages of the transfer operations described above, sorting and fitting individual slats as such requires a lot of labor and equipment.

10 In parquet boards, the wood grains of the tread are usually longitudinal to the board, but parquet boards are also known in which the wood grains of the tread are perpendicular to the surface of the board. In the latter case, the wear resistance of the parquet board is many times higher than that of a conventional parquet board.

The object of the invention is to provide a method for manufacturing parquet boards which avoids the disadvantages of the above-mentioned manufacturing methods and with which the above-mentioned errors due to the treatment of tread slats can be eliminated and with which labor and material costs can be reduced.

These objects can be achieved by a production method according to the invention, the main features of which are set out in the appended claim 1.

The invention is based on the realization that blanks of tread wood material are glued and pressed into an adhesive beam, which is then sliced into tread plates, for example with a band-splitting saw, which in turn is glued to the substrate to form a parquet board. This board is then broken up in a manner known per se, for example by means of a multi-blade circular saw, into parquet boards, on the sides of which tongues and tongues are machined and on the ends pins and grooves or similar fastening members are machined.

95008 3

In the solution according to the invention, the tread, before it is placed on the substrate, is manufactured as a sheet as described above, whereby the thinning and other defects of tread materials in sawing treatment of previously known manufacturing methods are omitted, as well as the transfer of rather heterogeneous loose pattern patterns. and material costs are significantly reduced.

10

According to a preferred embodiment, said blanks, the lengths and thicknesses of which correspond to the lengths and widths of the slats of the finished parquet board, are glued from their flaps and ends to each other in a beam press. longitudinal.

20 According to another embodiment, said blanks, the widths and thicknesses of which correspond to the lengths and widths of the slats of the finished parquet board, are glued together on their wide and narrow sides in a beam press, which also has an end press. against the surface of the board. The abrasion resistance of such a parquet board made of endwood is many times higher than that of parquet boards in which the wood grain is parallel to the length of the board.

According to a further preferred embodiment, in the gluing step, 35 lower quality boards for sawing and machining are included between adjacent blank units corresponding to the width of the finished parquet board.

According to the invention, the substrate layer is preferably produced in a manner similar to the tread layer, i.e. blanks of substrate 95008 4 materials, usually softwood, are glued and pressed into an adhesive beam, which is then sliced with a band saw to plywood which is glued crosswise to the treads, preferably 5 into roxet parquet boards.

The invention will now be described in more detail with reference to the accompanying drawing, in which Fig. 1 shows a top view of an adhesive beam prepared as an intermediate according to the invention, Fig. 2 shows the same structure as Fig. 1 from the side, Fig. 3 shows a vertical sectional view of a parquet board made according to the invention; from another parquet board made according to the invention, and Fig. 5 shows a top view of another adhesive beam prepared as an intermediate according to the invention.

20

A tread material, such as oak, is made by sawing and planing blanks 2. In Figures 1 and 2, the length of one blank is denoted by a, the thickness b and the width c.

25 • A certain number of blank units are introduced into the beam press, for example four pieces with boards 3 of sawn wood material for sawing and machining between the blank units. Each blank unit has a certain number of 30 blank rows, for example three pieces. The glued beam 1 is pressed in a press which also has an end press to press the precisely sawn ends together. In the example case, the height of the beam, when the thickness b of the blank, i.e. the width of the slat, is 60 mm and the thickness of the base-quality board is 5-6 mm, is 4 x (180 mm + 0.5-0.6 mm) = 740-744 mm .

The adhesive beam 1 thus prepared is sliced with a band-splitting saw into several tread plates 5 or 10, the thickness of which

II

5,9008 can be, for example, about 5 mm for the production of 3-layer parquet boards 4, or about 11.5 mm (2 x 5 mm + the saw gap required by Vannesa for about 1.5 mm) for the production of 5-layer parquet boards 9.

5

The baseboards 6 and 7 are made in a similar manner to the tread plate by gluing and pressing blanks of substrate material, e.g. softwood, in a beam press to form a glue beam, which is then sliced into sheets with a thickness of about 5 mm, for example with a band saw.

The tread plates 5 (Fig. 3) or 10 (Fig. 4), the adhesive average plates 6 and the counter plates 7 are stacked in the manner of gluing plywood into either 3- or 5-layer stacks, which stacks can be fed either directly to a hot press or pre-pressed as plywood is made. in the stack before feeding to the hot press. The adhesive must then be suitable for pre-compression, such as phenol-re-sorsinol adhesive. The 3- or 5-layer pile crosslinked with pre-pile-20 facilitates its error-free feeding to the hot press, and for multi-shift use of the hot press, the pile can be pre-pressed during the day shift for evening and even night shifts, similar to plywood gluing. A hot press 25 with suitable feed and discharge devices requires only one worker. Since the hot press is the most expensive machine for the production of parquet, cheaper machines can be obtained by increasing the capacity if necessary by using the hot press in two or three shifts. When gluing the parquet board 9 into 5-layer-30 sex, the tread board 10 must be 2 times plus the saw gap required by Vannesa thicker than the final tread of the board, also taking into account the grinding material.

One or both ends of the adhesive middle plate 6 (Fig. 3) can be provided with a few centimeters of the tread 5 of the tread in the direction of the tread 5. These autumn longitudinal slices 8 of the board are needed 6 95008 when machining parquet boards from the parquet boards 4.

Finally, the 3-layer parquet board 4 is split lengthwise into parquet boards with a multi-5 circular saw with its flap, and the 5-layer parquet board 9 is further divided into 3-layer parquet boards with a band splitting saw in the middle. The parquet boards thus obtained are provided with pins and grooves at the ends and with tongues and pon-10 roads at the sides.

For the above-mentioned parquet board, the guide values for the above-mentioned parquet board are 100 m2 per finished parquet board: 15 - edged tread blank 1.0 m3 - sawn timber decay and too little edge removed 2.0 m3 - hot press glue 9 kg (100% dry) 20

The method according to the invention can also be used to produce parquet boards with a tread on the end wood, i.e. the direction of the tread wood grain is perpendicular to the plane of the board (see Fig. 5). Blanks 12 are sawn and planed from a tread material 25, for example oak. In a manner similar to that described above, a number of blank units are introduced into the beam press, for example four pieces with boards 13 of base wood material interposed between the blank units. for example, two pieces. The glued beam is pressed in a press to form an adhesive beam 11. This adhesive beam is further processed in a manner similar to that described above in connection with Figures 1-4.

35

Claims (4)

A method of making parquet boards, comprising at least one backing layer (6, 7) and one above said glued wear surface layer (5, 10) having the desired slat pattern, characterized in that a glue beam (1, 11), the thickness of (c) is multiple in relation to the thickness of the wear surface layer (5, 10), is produced by gluing and pressing several blanks (2, 12) of a wear surface material, said glue beam (1, 1) being said to several wear panels (5, 10) of the desired thickness, The individual sheets are then glued to a backing layer (6) to form a board (4, 9) of parquet boards which is said to be parquet boards and, if desired, machined in the sides and ends of the parquet boards in a manner known per se. blasting and spontaneous or equivalent. 15 Method according to claim 1, characterized in that said blanks (2) of lengths (a) and thicknesses (b) corresponding to the lengths and widths of the slats in a finished parquet board are glued at their lateral sides and ends at each other in a beam press which also includes die pressing to form a glue beam (1) having a thickness corresponding to the width (c) of the blanks, the tree fibers in the wear surface layer of the finished parquet board being in the longitudinal direction of the board. 25 3. A method according to claim 1, characterized in that said blanks (12) having widths and thicknesses corresponding to the lengths and widths of the slats in a finished parquet board are glued at their width and narrow sides to one another in a beam press which also comprises butt pressing to form a glue beam (l1) having a thickness corresponding to the length of the blanks, the tree fibers in the wear layer of the finished parquet board being perpendicular to the board surface. Method according to any of the preceding claims, characterized in that in the glue beam (1, 11), at its bonding stage, between adjacent blank unit units corresponding to the width of a finished parquet board, boards (3, 13. of poorer quality for cutting and machining) are included.