DE10200335A1 - Trapezoid layers for beam in initial state have longitudinally symmetrical cross sections with coordinated external surfaces and arms so that fibers are parallel - Google Patents

Abstract

The trapezoid layers are used to build up beams (1) from sawn segments of logs, producing a number of triangular or trapezoid layers. These layers (4) in their initial form have longitudinally symmetrical cross sections. There external surfaces and arms are coordinated in such a manner that the fibers are parallel to each other.

Description

State of the art

DE 28 49 757 A1 describes a method using triangles Similar slats for the production of boards from glued packages, of which the panels are sawn off parallel and also transversely to the longitudinal fiber direction. A solution for core area free slats and the quality assurance of Slat lengths (error capping and finger jointing) are not shown; in particular, it is not shown how this works with wedges of different lengths shaped starting pieces should be practiced, because under different geometries of the cross-section ends is a longitudinal finger joint not possible anymore.

WO 89/04747 describes round log radial cuts with repeated loading pull to the center of the roundwood geometry and from that the corresponding single piece formations. This system is only the same moderately round wooden sections with a precisely centered, small core range of healthy wood is practicable.

DE 692 26 540 T2 describes a method for producing the same angled, equilateral triangles, with the integration of paralle len wooden parts / plates for the inner triangle tips the distance to the core area is achieved. With this procedure be any package cross-sections formed for any slicing; for her This method is not suitable for long bars.

DE 196 13 237 C2 describes the beginning of the procedures with the Forming the log into an octagon, and then the right angle to create triangular slats. A solution for creating a Octogons on oval and curved sections and for core-free La Mell with optimal yield, as well as for meaningful reaching of the bars heights are not shown; and the proposed cuboid formation (without Finger jointing of the triangular slats) is only possible with logs of the same length sections and triangular slats of equal length without quality lengths capping possible. However, Stark can cut quality lengths  wood use cannot be dispensed with. Incidentally, the procedure has with right-angled triangular lamellae yield disadvantages compared to the same legged triangular lamellas.

DE 101 35 123 and DE 101 54 269 and DE 101 61 024 show Solutions for qualities or for core area-free slats and variable Bar height builds, and it will also avoid large resources vertical to slat widths not in demand by the market. Fer Solutions are shown, such as for crooked / misshapen logs form more advantageous variety assignments through asymmetrical classifications and approximations to the same radial and tangential structures possible are.

However, the "state of the art" shows no disclosure of how fiber-parallel qualities for trapezoidal lamella shape with continuous / ends same cross-sectional geometries (and therefore suitable for longitudinal finger joints net) can be produced.

invention

Building authority approval criteria and "Ü" markings make it necessary for the trapezoidal fins ( 2 ) to undergo a quality assessment with appropriate length caps after drying. A large number of individual pieces of completely different lengths are created from the basic trapezoidal slat lengths, which are then finger-jointed to form strands ( 3 ). Accordingly, only Lamel lenstücke with consistently the same cross-sectional profiles ( 2 ) can be used within a strand. This is "state of the art". Trapezoidal lamellas ( 2 ) for trapezoidal lamella beams ( 1 ) cannot be wedge-shaped ( 7 ) and cannot be layered in layers by longitudinal turns. To achieve advantageous fiber parallelism ( 5 and 6 ) it is therefore not possible to create the trimming line ( 8 ) along the outer surface of the tree ( 9 ) when trimming ( 8 ) raw, triangular-like lamellae.

This dominates the cutting pattern throughout the sawing industry "From inside to outside thinking" with parallelities to a centric / central longitudinal axis. What is bulky and conical (woody) on the outside leads for incalculable uses; mostly to so-called side boards, so not to main products.

In the system according to the invention for the production of fiber-parallel trapezoidal lamellae ( 5 and 6 ), in the first stage, the separating cuts ( 10 ) are set parallel to the plait diameter and pole diameter outer surface level ( 4 ), and wedge-like remnants ( 11 ) are created inside.

In the second stage, the segments ( 12 ) are divided into triangle-like raw slats ( 14 ) in alignment with the leg position ( 13 ) and the corresponding outer surface level ( 4 ); the division can be symmetrical or asymmetrical (DE 101 61 024).

In the third stage, the trimming ( 15 ) takes place with the exact match of the trapezoidal legs ( 16 ).

Descriptions of the figures

Fig. 1 shows the correspondence of the outer tree surfaces ( 4 ) as a prerequisite for the production of fiber-parallel ( 5 and 6 ) trapezoidal plates ( 2 ).

Fig. 2 shows the structures of the fiber-parallel slats ( 5 and 6 ) and a graphical perspective of the trapezoidal slat bar ( 1 ).

Fig. 3 shows the sequence of "non-fiber parallel" formation.

Fig. 4 shows a sequence for the production of segments ( 12 ) with matching outer tree surfaces ( 4 ) and the resulting wedge-shaped ( 1 ) remainders with parallel fiber metho.

Claims (3)

1. Trapezoidal lamellar forms and processes therefor, or processes for the production of trapezoidal lamella beams ( 1 ), for which sawed out segments of different lengths of round wood and the circular segment-shaped half-timber - or the segments produced therefrom - into a multitude of triangular lamellae or trapezoidal lamellas with symmetrical or Asymmetrical placements - also taking measurements / cross-section image recognition - into account, characterized in that the triangular-like raw slats ( 14 ) have congruent cross-sections in the longitudinal direction with congruence of outer tree surfaces ( 4 ) and trapezoidal legs ( 16 ), and thus fiber parallelism ( 5 and 6 ). 2. Forms and methods according to 1., characterized in that the division into triangular-like raw lamellae ( 14 ) already begins with the semi-wood-like segment ( 17 ). 3. Forms and methods according to 1. to 2., characterized in that the trimming lines ( 15 ) for producing the trapezoidal lamella ( 2 ) are oriented towards an appropriate leg position ( 16 ).