SK36598A3 - Blank for manufacturing a laminated plate or a laminated beam plate - Google Patents

Abstract

The invention relates to a blank for laminated beam plates, comprising an elongated piece of wood with a specific shape, including two planear lateral surface sections (2, 3) and a lower surface section (4) and an upper surface section connecting these. Said upper surface section comprises an elongated, ridge-shaped tip section (5), and, between each lateral surface section (2, 3) and the tip section (5), a first planar surface section (6; 9) to be glued and a second planar surface section (7; 10) to be glued and a planar intermediate surface section (8; 11) connecting these. Said first surface section (6; 9) and said second surface section (7; 10) are mutually parallel and the width a of said first surface section (6; 9) is equal to the width b of said second surface section (7; 10) and the width c of the intermediate surface section (8; 11) is half of the width a or b. In addition, the angle alpha between the intermediate surface section (8; 11) and said second surface section (7; 10) is equal to the angle of opening beta of the ridge-shaped tip section (5), which is preferably in the range of 90 to 135 DEG .

Description

Blank for the production of laminated board or laminated timber board

Technical field

The invention relates to a blank formed by an elongated piece of wood of a specific shape having two planar side surface portions and an upper surface portion and a lower surface portion connecting them. These blanks are used for the production of laminated beams which can be further used for the production of laminated beams or laminated beams or other products.

BACKGROUND OF THE INVENTION

To date, it is known to manufacture laminated timbers from pieces of solid-sorted timber of rectangular cross-section, which have been cut from cuts of higher overall quality than average and suitable for the production of laminated timbers. Usually such pieces of wood are glued by pressing the timber after drying. In the manufacture of laminated beams, these were treated after sizing. A laminated beam made in this way is not suitable for all purposes of use and tends to twist.

The so-called laminated boards are generally made from lath strips cut from approximately 45 mm thick prisms by gluing the strips by frictional pressure. Although less frequently, laminated boards can also be made by cutting laminated beams vertically using a panel saw.

Laminated timbers and slabs are usually made of cut-outs that are expensive compared to small-sized wood. In addition, the consumption of cut-outs is higher when laminated beams and boards are produced by the above method. The consumption of cut-outs in cubic meters for each of the above products is calculated as follows;

- at least 2 m ^{3 of} logs per 1 m '' of timber,

- a minimum of 1,75 m ^{3 of} timber, ie a minimum of 3,5 m ^{3 of} logs per m ^{3 of} laminated timbers,

- at least 2,3 m ^{3 of} sawn timber, ie at least 4,6 m ^{3 of} cut-outs per 1 m ^{3 of} laminated boards.

It should also be taken into account that the timber obtained from the cut-outs will not be entirely suitable for the production of laminated timbers or for the production of laminated boards.

SUMMARY OF THE INVENTION

The object of the invention is a blank which can be made of less expensive small-dimensional wood and which has a profile which allows small-dimensional wood to be used very efficiently and also makes it possible to produce laminated timber boards with excellent strength properties.

These objectives are achieved by a blank of the present invention comprising a longitudinal piece of wood of a specific shape comprising two planar side surface portions and a lower surface portion and an upper surface portion joining them, and wherein said upper surface portion comprises a longitudinal top portion a ridge shape, and between each lateral surface portion and the apex portion, a first planar surface portion to be glued and a second planar surface portion to be glued, and a planar intermediate surface portion that joins them. Said first surface portion and said second surface portion are parallel to each other, said first surface portion having a width equal to the width of said second surface portion and the width of the intermediate surface portion being half the width of the first surface portion or the second surface portion. The angle α clamped by the intermediate surface portion and said second surface portion is equal to the opening angle β of the crest-shaped apex, said angles α and β being approximately 90 to 135 °.

The billet according to the invention is preferably made of small-sized wood, the cost of which is about a third of the billet. The blank of the present invention is made by processing small-sized wood so as to directly obtain the final shape, thereby achieving a very high yield.

The aforementioned lower surface portion is preferably planar, and thus, by cutting the thinner core and adjusting the surface profile, two blanks according to the invention are obtained. To truly work with great precision, small-sized wood is split across the core by precisely placing the small-sized wood using a tracker by cutting the core through a saw cut, for example using a saw band for sawing, and forming the halves with a machine with two upper horizontal spindles. The reason for this is that the wood core is never placed in the center of the cross-sectional surface.

Said side surface portions are preferably parallel to each other and also at right angles to said bottom surface portion.

Overview of the figures in the attached drawings

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1A is a cross-section of a blank according to the invention, Figure IB is a view of the same structure as in Figure 1A together with the dimensional marks; the cutting and profiling lines are shown, and Figure 3 is a view of a laminated beamed board made of blanks according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

According to Figures 1A and IB, blank I of the present invention is longitudinal, e.g. A 3 m long piece of wood of a specified shape, which was made of small-sized wood. This blank I has a planar lower surface portion 4 and two mutually parallel planar side surface portions 2 and 3 that are at right angles to the lower surface portion and an upper surface portion. This upper surface portion comprises a longitudinal top portion 5 of the ridge shape. Between the left side surface portion 2 and the top portion 5 is a first planar surface portion 6 to be glued and a second planar surface portion 7 to be glued, the surface portions 6 and 7 being joined by a planar intermediate surface portion 8. Similarly, between the right side the surface portion 3 and the top portion 5 is a first planar surface portion 9 to be glued and a second surface planar portion 10 to be glued, the surface portions 9 and 10 being joined by an intermediate surface portion 11

The blank according to the invention fulfills the following conditions:

- width a of first surface portion 6 (a 9) = width b of second surface portion 7 (a JO),

width c of the intermediate surface portion 8 (a 11) = 1/2 a = I / 2 b a

an angle α between the intermediate surface portion 8 (or 11) and the second surface portion 7 (or 10) = the opening angle β (3 of the apex).

In the example shown in Figures 1A and 1B, the angles α and β are approximately 90 °.

Figure 2 shows a cross-section of the small-size wood 13 from which the blanks I according to the invention are made, for example using a profiling chopper.

After drying, these blanks 1, rotated by surfaces, are glued to each other by means of a horizontal press to form a laminated beam 12, the structure of which is shown in Figure 3.

According to the present invention, the consumption of circular small-sized wood is only about 1.5 m ³ per cubic meter of boards, while conventional laminated board production requires approximately 4.6 m ^{3 of} logs and conventional laminated timber production requires approximately 3.5 m ^{3 of} logs per m ³ product. Moreover, the price of small-sized wood is only about one third of the price of logs.

The fibrous pattern on the surface of a laminated timber board made of the blanks of the present invention will meet the current market requirements in that the annual circles are perpendicular to this surface. In the case of laminated boards produced by conventional methods, when using wood with a diameter corresponding to the considered board thickness, the resulting products will be identical to one another, which is not one of the best aspects of laminated boards produced by conventional methods.

This board is perfectly suited as a laminated beam due to its glued symmetrical structure. Such a structure does not twist, as is often the case with conventional laminated timber structures.

The blank according to the invention makes it possible to produce a very economical laminated timber board from small-sized wood using the following direct means and methods:

1. Cutting the core of a thinner and forming a surface profile with a suitable machine.

2. Loading the sheet blanks in a drying device and subsequent drying. A continuous drying device or a high-frequency vacuum drying device may be used for this drying.

3. Tilting of billets to size and sizing together with planing. To produce a long board, the blanks can be joined by a wedge joint before planing.

4. Load the blanks with the applied sizing on the inlet end of the sizing press and sizing the blanks.

Since in the high-frequency drying the wood dries and shrinks simultaneously across the entire cross-section, the shrinkage can be predicted. This makes it possible to apply the size to the blanks while they are fresh and to equip the high-frequency vacuum drying device with a press.

As explained above, laminated boards made of blanks according to the present invention can be made of laminated boards and laminated boards by longitudinal expansion. In addition, it is possible to obtain construction logs, window blanks or similar blanks for a wide variety of purposes from laminated timber boards by longitudinal cutting, and by cross cutting decorative end fibrous patterns, for example for floorboards.

Claims (4)

PATENT CLAIMS A laminate (1) blank (1) comprising a longitudinal piece of wood of a specific shape comprising two planar side surface portions (2,3) and a lower surface portion (4) and an upper surface portion joining them, wherein: said piece of wood is prepared from round small-sized wood, characterized in that said upper surface portion comprises a longitudinal top portion of the ridge shape (5), and between each lateral surface portion (2,3) and the top portion (5), a first planar surface the gluing portion (6; 9) and the second planar surface portion (7; 10) and the planar intermediate surface portion (8; 11) joining them, the first surface portion (6; 9) and the second surface portion (7; 10) are parallel to each other, and the first surface portion (6; 9) has a width (a) equal to the width (b) of the second surface portion (7; 10), the width (c) of the intermediate surface portion ( 8; 11) is after the half-width (a) or (b), and the angle (a) formed by the intermediate surface portion (8; 11) and the second surface portion (7; 10) is equal to the opening angle (β) of the apex of the ridge shape (5), with the angles (α) and (β) being approximately 90 to 135 °. Blank according to claim 1, characterized in that the lower surface portion (4) is planar. Blank according to claim 1 or 2, characterized in that the side surface portions (2,3) are parallel to each other. The blank according to claim 3, characterized in that the side surface portions (2,3) are at right angles to the bottom surface portion (4).