SE525081C2 - Method for manufacturing glue boards and glue joists from square boards and planks - Google Patents

Abstract

The present invention is a method for manufacturing edge-glued panels or laminated beams, from sawn timber edges with pronounced wane. Logs from small diameter trees have tight and sound knots, and are for this reason suitable for furniture and interior furnishing. However with conventional methods, trees below a certain diameter (less than about 14 cm) cannot be used profitable, for such furniture and interior applications. The method according to this invention makes it feasible to use logs of smaller diameter than is possible with conventional methods. The starting material is sawn timber pieces (2) having edges with pronounced wane. In addition to profiling (f) the waney edges, the pieces are optionally cut (20d) resulting in members (20). These members are seubsequently joined, thus obtaining thick laminated pieces (21) typically in the form of panels. These may be cut into thin panels (22) characterized by surfaces (22s) with a pleasin grain pattern and even distance between the glue lines of the joints.

Description

50 55 60 65 70 75 80 85 90 525 081 “Z fig 2b, which can be divided into thinner in a frame saw or in another way.

The patent description and the drawing also show a pitch (b), perpendicular to the flat sides of the pieces. A significant difference from the present invention, however, is that the pitch (b) is only intended to obtain edge pieces for the edges of the adhesive joint board in the manner illustrated in Fig. 2c - i.e. the purpose is not to obtain slatted timber for the glue joint construction.

[Quote from the patent specification: "Pieces with a rectangular edge, for both edges of the disc, are obtained by dividing some of the pieces 1 in the middle in half along the line bm".] [DE 2938062] A way of profiling the van edges as part of the manufacture of glue joints, for obtaining a high saw yield from small timber, is presented in DE 2938062. The patent teaches profiling of the edges of the splinter pieces (1038) for logs with 10-20 cm diameter divided according to Fig. 2d. According to the description, the profiling prescribed in the patent can also be made on the edges of the log halves (102), in Fig. 1b, for logs with diameters less than 10 cm. OBJECTS OF THE INVENTION The invention aims to improve the quality of adhesive joint boards - specifically in terms of tendency to cupping - compared to boards made according to known methods which, like the invention, also provide a high saw yield from small timber.

FIGURES - DESCRIPTION Fig l ... Known methods part 1.

Fig 2 ... Known methods part 2.

Fig. 3 ... Embodiment 1.

Fig. 4 ... Embodiment 2.

FIGURES - DESIGNATIONS ON DETAILS lOl ... Stock. 102 ... Split log (or other square plank). 103 ... Trapezoid format piece of wood. 103M ... Trapezoid format wood piece (marrow part). 103S ... Trapezoidal format timber piece (splinter part). lO3K ... Piece of wood for the edge of the board. 95 100 105 110 115 125 130 135 525 081 .3 a ... Dividing surface: division of log (known method). b ... Partition surface: partition to obtain edge pieces (known method). c ... Partition surface: partition to obtain slatted timber (“first partition”). d ... Partition surface: partition of disc (“second partition”).

A ... Wood piece type A.

B ... Wood piece type B.

B * ... Wood piece type B, inverted. f ... The edge of the piece of wood (flat surface or profiled surface). 104 ... Undercutter. l05 ... Cutter.

FIGURES - DIMENSIONS t ... Tool width on milling tools. x ..Olap between under and over cutter. y ... Overlap between under and over cutter. u .Angle: cut on milling tools. v. angle angle of milling tool.

DETAILED DESCRIPTION OF THE INVENTION [Embodiment 1] A first embodiment of the invention is illustrated in Fig. 3. As indicated by the broken line (c) in Fig. 3a, the plank (102) is divided into two parts. In this way, with suitable edging before or after the division, four pieces of wood (A, A, B, B) are obtained from the log (101) according to Fig. 3b.

Then, in Fig. 2c, the pieces (B) are inverted relative to (A) (inverted (B) is denoted (B *)). Now a large number of these pieces, (A, B *), can be joined together into thick discs in the manner illustrated in Fig. 3d. The thick slices can then be divided, along the dashed line (d) in Fig. 3e, into thinner slices.

[Embodiment 2] In another embodiment, illustrated in Fig. 4, the division (c) is performed by inclined milling tools, a lower cutter (104) and an upper cutter (105). As Fig. 4d demonstrates, in this way, both division and profiling can be obtained simultaneously in a single operation. The tool width of the milling tools (104, 105) is denoted by (t). In order for both division and profiling to take place, there are some conditions that 140 145 150 155 160 165 525 081 Eels must be met. First, the lower and upper cutters must tangential or overlap with the distance x ZO in the axial direction and with the distance y = tXtan (v) + (t + x) / tan (u) in the radial direction (perpendicular to the axial direction) in the cross-sectional plane shown in the figure. Second, the bevel angle (u) and the slope of the section (v) must satisfy the condition O <v S u S v + 90 °.

The vane edges are advantageously machined in a known manner into a profile (f) exemplified in Fig. 3f and Fig. 4e.

[First division] The purpose of the first division, (c), is to break the annual ring orientation and thereby reduce the cupping of the finished adhesive joint board. Note how the annual ring pattern changes when going from a slat piece to an adjacent one of the discs in Fig. 3d and Fig. 4c. But if, on the other hand, the disc is built without turning the pieces (B) in relation to (A) in reverse, a disc with annual rings as in Fig. 2b is obtained instead. Also note that the order of the profiling (f) and the first division (c) is only a practical question. I.e. the lamella pieces (A) and (B) can be obtained: either by first profiling the square plank and then dividing it, or by first dividing the plank into two square pieces and then profiling them.

[Second pitch] Note that when the boards are divided exactly in the middle, along (d) in Fig. 3e and Fig. 4c, practically equal distances are obtained between the joints on the respective dividing surface of the resulting two boards.

Claims (3)

1. 525 081 PATENT REQUIREMENTS 1. Method for manufacturing glue joint boards from logs of small timber, comprising a division of the logs into two square planks and a profiling of the planes' planes, which is called: ec kria dav, that each and every one of the planks, except said profiling the vane edges, undergoes a first division from their marrow side to their splinter side, whereby two profiled pieces, (A) and (B), are obtained from each plank; and that all the paragraphs (B) are inverted relative to all the paragraphs (A); and that the pieces are then joined together in such a way that: the first dividing surface of a first paragraph is joined to the first dividing surface of a second paragraph, and the profiled vane of the second paragraph is joined to the profiled vane edge of a third paragraph, and that the first paragraph of the third paragraph dividing surface is joined to the first dividing surface of a fourth piece, and so on adding a finite number of pieces to a disc. Method for manufacturing glue joint boards from logs of small timber according to the preceding claim, characterized in that the first division takes place with a milling tool comprising a lower cutter (104) and an upper cutter (105) both with a tool width (t) and with inserts having a bevel angle (u); and that division is made, firstly, so that the planks - which are transported relative to the undercutter and the upper cutter in a transport direction perpendicular to the axes of rotation of the lower cutter and the upper cutter - are inclined with the flat sides (ie the margin side and the splinter side) at an angle (v) relative to the two the axes of rotation, seen in a cross-sectional plane whose normal is directed in the direction of transport; and, second, so that the axes of rotation of the upper cutter and the lower cutter are parallel to each other; and, third, so that the lower cutter and the upper cutter, projected along the direction of transport on the cross-sectional plane, are tangent to each other or overlap a distance (x) in the direction of the axes of rotation; and, fourth, that the undercutter and the overcutter, projected along the transport direction on the cross-sectional plane, overlap a distance y = tXtan (v) + (t + x) / tan (u) in the radial direction of the axes of rotation; and, fifth, that O <v S u S v + 90 °. A method for manufacturing glue joint boards from logs of small timber according to any one of the preceding claims, characterized in that said boards are each divided in the middle into two thinner boards.