EP1091836B1 - Chipping, method and device for producing said chipping and shaping a tree trunk and use thereof - Google Patents

Abstract

For use as a wood intermediary and the like in industry, an essentially wedge-shaped wood flake with opposite concave and convex surfaces that converge at an imaginary tip outside the flake dimensions. The tip is located beyond the flake a distance of typically between 40% and 100% of the flake length.

Description

The invention relates to a wood chip with a first, concave surface and a second, convex surface, the between them the essentially wedge-shaped Limit wood chips, with the surfaces in an imaginary Converge the tip outside the wood chip and the Tip on a midline running between the surfaces around a midline section outside of the chips lies.

The invention further relates to a method for generating a essentially wedge-shaped wood chips, in which the wood chips by means of a rotating chipping tool is machined from the wood in such a way that it is a first, concave Surface and a second, convex surface that limit the wood chips between them.

The invention further relates to a method for profiling a Tree trunk, in which lengthwise by means of a chipping tool running corners cut out of the tree trunk and side boards are sawn off the tree trunk, one narrow side of one edge surface of the corner is formed, before the removal the corners a saw cut along the other edge surface to be led.

The invention further relates to a device for generating an essentially wedge-shaped chip, in which the Wood chips by means of a rotating chipper tool is machined from the wood so that it has a first, concave surface and has a second, convex surface between limit the wood chips.

The invention also relates to a device for profiling of a tree trunk, with a chipping tool for chipping longitudinal corners from the tree trunk, with means for sawing off of side boards from the tree trunk, one narrow side of which is formed by one edge surface of the corner, and with one Saw to make a saw cut along the other edge surface before chipping the corners.

Finally, the invention relates to uses of the aforementioned Wood chips, the method mentioned and the above Contraption.

It is well known in the woodworking art All or part of wood using so-called chipper tools to machine. The cutting tools are usually used rotating tools with chipper knives on their circumference. The chipping tools are usually fixed in space, and the wood to be cut or machined becomes guided along the chipper head in the axial direction of the wood.

Because of these conditions, the wood chips produced a wing-like shape with a substantially wedge-shaped Cross-section. The chips are big on their two Surfaces bounded by a concave or convex side, these sides from a thick end of the wood chip too a thin end or in the cross-sectional representation of a Lead tip in which the two surfaces run tangentially into one another.

Wood chips are a valuable raw material in different ways Industries. This includes the pulp industry, the paper industry, but also the manufacturers of Wood-based materials and so-called composite components, i.e. Slabs, boards and beams made by gluing wood chips getting produced.

These processing companies take on wood chips a certain classification. Are particularly preferred Wood chips of medium size because the chips are too large badly processed and too small or too thin chips especially in the production of pulp, Loss of paper, wood-based materials and composite components or lead to no sustainable structures.

The classification of the wood chips delivered is crucial for the price that a processing company is willing to pay for these chips. As a result, there is a significant one in the woodworking industry Desire in the production of wood chips only if possible to produce such chips that are within the classification the highest prices in the processing industry achieve.

If wood chips using a rotating chipping tool generated in the manner described in more detail above along its wedge-shaped cross-section the thinly tapering one End up. This thin end represents for further processing The wood chips are a disadvantage because of this thin ends either dissolve in the pulp or during manufacture from composite components to less stable areas leads.

In practice, wood chips are either cut completely of wood or when partially chipping wood generated.

A partial removal of wood takes place e.g. in the so-called Profiling tree trunks instead. This means the all-round processing of initially raw tree trunks around this to give a cross-sectional shape (profile) in which the profiled tree trunk by subsequent sawing in simple Way can be broken down into boards and beams. A corresponding one Methods and a corresponding device are e.g. described in DE 29 28 949 A.

In these known methods and devices, the Tree trunks processed during profiling using so-called corner cutters, that mill corners out of the tree trunk in the axial direction, so that the previously or later flattened on all sides Tree trunk receives a profile with the so-called side boards can be sawed off.

DE 37 02 980 C2 describes a corresponding method and a corresponding device described. With the well-known Procedure is first entered from one side of a tree trunk first, for example horizontal saw cut predetermined Depth made, in this case the axis of rotation of the saw blade runs vertically. After making the saw cut or (using a combined tool head) at the same time a part of the wood becomes above of the saw cut, including the axis of rotation the chipper tool, or a combined one Tool head the common axis of rotation, runs vertically. The spanned area does not reach that far horizontally Into the tree trunk as the first saw cut is deep. After that the remaining area above the horizontal saw cut with a Cutting tool, whose axis of rotation in the example mentioned runs horizontally. Afterwards or simultaneously with The cutting process is a second, vertical saw cut attached, the bottom of the gap created with its center lies where the first, horizontal saw cut ends in wood. As a result, there will be a total area worked out of the tree trunk, which is corner-like trained, but is basically stepped at the corner. Important is making sure that at no time one of the two cutting tools engages in an area that was previously sawn out. With this known methods are thus also described, as is this was created, only so-called "comma chips". EP 0 770 461 A2 describes a method and an installation for Splitting tree trunks into smaller wood products known.

In this method, a tree trunk is profiled in that first using circular saw blades with their axes at 90 ° to each other are inclined, the corners are sawn out completely.

When sawing out, strips are created that come from the actual Profiling system removed and in a separate chipper be completely machined.

EP 0 775 558 A1 describes a method for processing Tree trunks known. In this procedure, first of all, a band saw made a longitudinal cut through the tree trunk, this saw cut is placed so that it is a side board separates from the tree trunk. The saw blade follows in the sawn gap a separating element with which the material is still attached to the tree trunk connected side board at a distance from the remaining one Main goods are held. The separating element in turn follows combined trimming tool that in the already described Way of a chipper and a circular saw blade connected to it consists. With this tool the corner area machined above the narrow side of the side board to be produced and at the same time the narrow side of the side board by means of the Circular saw blade processed in a high surface quality. The cutting knife and that have in the cutting tool Circular saw blade the same radius of the circle. The flight circle runs tangential to the broad side of the separated side board, in other words, the saw teeth and the chipper knives are running not in those produced by the leading band saw Gap in it. Even if in this known method Flight circle of the spanish knives would extend into the gap, this would be in the context of the present invention irrelevant because, as is well known, with band saws only extremely narrow Saw joints are generated, which are typically a maximum of 3 mm wide are. This would only result in the very extreme tips of the chips to be affected. However, this would only result in an economic one irrelevant change in shape of the chips. This also applies to this known methods in principle those already mentioned "Comma chips" created.

In all of the above methods and devices thus on the one hand conventional wood chips with a thin taper End and on the other hand sawdust produced.

DE 43 37 682 C1 describes a method and a device known for cutting a tree trunk.

According to the known method, one is flattened laterally Tree trunk first using a circular saw side boards sawn off, which are still provided with forest edges at their edges are. These side boards are as long as they are leading End are still materially connected to the tree trunk from which Saw plane bent and then run essentially at a distance parallel to the tree trunk. Be in this spaced apart position the side boards by means of a trimmer on the narrow sides machined and trimmed with it. The cutting edges of the trimmer run at a radial pressure angle of approx. 45 ° Direction through the wood in the area of the forest edges. The side boards run almost in the area of the axis of rotation of the trimmer past this. This is possible because as mentioned, the side boards at the moment in the side Distance from the main goods. Sense of this measure is so-called when trimming the previously bent side board To produce "equal-thickness chips", ie chips that are in contrast to the so-called "comma chips" essentially one have a constant thickness parallel to the wood fiber. This Cross-section chips are approximately parallelogram-shaped in cross-section, where the corner angle is approximately 45 ° (or 135 °), because the cutting plane of the chipper on the wood, as mentioned, at about 45 ° to the direction of movement of the side boards lies.

The known method and the known device have thus the advantage of generating chips that are required for a subsequent Processing in the cellulose industry made cheaper are, this advantage must, however, with considerable additional Effort to be bought because the side boards after sawing off bent out of the saw plane and there at a considerable distance must be trimmed by the main goods. this is not possible for all types of wood, at least not without the side boards when turning in the fiber to harm.

The invention is based on the object, one Wood chips and method and devices of the beginning to further develop the type mentioned or the uses mentioned specify to avoid the disadvantages mentioned above. In particular, wood chips should be in an economically optimal manner are generated, the shape of which is as precise as possible Classes of chips correspond to those of the processing company Industry to be paid the highest.

In the case of a woodchip of the type mentioned at the beginning, this becomes Object achieved in that the length of the outside of the wood chip center line section between 40% and 100% of the length of the midline section within the chips.

In the process for producing a wood chip the input mentioned type the task according to the invention solved that the wood is removed from the area before chipping in which the surfaces converge in an imaginary tip.

In a method for profiling a tree trunk the entry mentioned type the task according to the invention solved that the cutting tool with its circle radius in reaches the gap created by the saw cut and is empty in it running.

In a device for producing a wood chip the task mentioned according to the invention solved that means are provided to the wood before chipping remove in the area where the surfaces are in a imaginary tip converge.

In a device for profiling a tree trunk the task mentioned according to the invention solved that the cutting tool with its circle radius up extends into the gap created by the saw cut, such that it runs empty in it.

The task is still solved by using the aforementioned Wood chips as strands in the production of composite beams or boards.

Further solutions according to the invention consist in the use the above method and the above Device for removing corners when profiling of tree trunks.

The object underlying the invention is achieved in this way completely solved.

In contrast to conventional, wedge-shaped chips with thin tapering end or thin tapering tip is according to the invention provided to remove this thinly tapered end, so that only the thicker end of the wood chips remains.

Such a shortened wood chip has one essential higher economic value and can therefore be in far better processed. The operator of a Sawmill system can therefore with such shaped chips with a much higher economic yield during count on the utilization of the wood chips.

The measure that the tip is on a between the surfaces extending centerline around a centerline section outside of the wood chips is between 40% and 100% of the length of the midline section within the chips has the advantage that a woodchip is produced, which is shortened just so far that it is an economic one Represents optimum.

It is also preferred if the center line of the wood chips the wood chips in the transition between the center line sections intersects in an interface. The interface preferably closes a finite angle with the center line a, so that further preferably the wood chips between the surfaces in the transition from the concave surface to the interface has a thickness between 2 and 10 mm.

These dimensions also have the advantage that they are economical optimally usable wood chips are created.

Corresponding to the exemplary embodiments described above Considerations apply in the same way to corresponding ones Embodiments of the method according to the invention and the device according to the invention.

It is also particularly preferred if the interface mentioned is. This is preferably done in that the Interface is made by sawing.

The saw is preferably a circular saw with a circular saw blade more than 5 to 6 mm thick. The circular saw further preferably follows a riving knife, which between the Saw and the cutting tool is arranged.

This measure opens up the possibility in one and the same The wood to be cut or cut prepare a cut, especially a saw cut, in such a way that during the subsequent engagement of the rotating chipping tool immediately the shortened wood chips mentioned arise because the area in which the thin ends or tips would have been produced.

Further advantages result from the description and the attached one Drawing.

Fig. 1

eine Schnittdarstellung durch einen Hackschnitzel, wie er mit herkömmlichen Zerspanerwerkzeugen hergestellt wird;

Fig. 2

eine Darstellung, ähnlich Fig. 1, jedoch für einen Hackschnitzel in erfindungsgemäßer Herstellung;

Fig. 3

eine schematisierte, radiale Querschnittsdarstellung eines Baumstamms zur Erläuterung eines Profiliervorganges;

Figuren 4 und 5

äußerst schematisierte Ansichten einer Vorrichtung zum Erzeugen von Hackschnitzeln herkömmlicher Art;

Fig. 6

eine Darstellung, ähnlich Fig. 5, jedoch in vergrößertem Maßstab und darstellend ein Ausführungsbeispiel einer erfindungsgemäßen Vorrichtung zum Erzeugen von erfindungsgemäßen Hackschnitzeln.

Exemplary embodiments of the invention are shown in the drawing and are explained in more detail in the following description. Show it:

Fig. 1

a sectional view through a wood chip, as it is produced with conventional chipping tools;

Fig. 2

a representation, similar to Figure 1, but for a wood chip in the inventive production.

Fig. 3

a schematic, radial cross-sectional view of a tree trunk to explain a profiling process;

Figures 4 and 5

extremely schematic views of a device for producing wood chips of a conventional type;

Fig. 6

a representation, similar to FIG. 5, but on an enlarged scale and illustrating an embodiment of an apparatus according to the invention for producing wood chips according to the invention.

In Fig. 1, 10 denotes a wood chip of a conventional type. The wood chips 10 have two sides or surfaces 12, 14 that are perpendicular to the plane of the drawing and the essential ones Form the surface of the chips 10. The left in Fig. 1 Surface 12 is concave and right surface 14 convex. Surfaces 12 and 14 run in below Fig. 1 tangentially in a tip 16 or edge. At the opposite end of the chips 10 is preferred flat end face 18 recognizable. Overall, the wood chips have 10 thus a thick end 20 and a thin end 22.

Prepare wood chips in the manner of wood chips 10 as shown in FIG. 1 in further processing in the pulp industry or the industry for the production of composite components, in particular Beams or planks, problems because of the thinner end 22 has hardly any stability of its own and can be further processed also dissolves in a liquid medium a stronger mechanical stress is destroyed, so that undefined fragments remain.

The economic value of the chips 10 can therefore can be increased significantly when the thinner end 22 is removed becomes.

This is done in the embodiment shown in FIG. 2 of the invention in that along a parting plane 24th a cut is made through the chips 10, so that thinner end 22 is removed.

The location of the parting plane 24 within the chips 10 ' can be determined in different ways. Here are before decisive for all economic considerations, i.e. the question, in which remaining shape the wood chips 10 'are the best offers economic yield. Typically this is lateral distance of the parting plane 24 from the tip 16 e.g. 6 mm.

If one imagines a center line 26 between the surfaces 12 and 14, then for example the center line section 26a within the remaining wood chip 10 'with a length l ₁ and the imaginary center line section 26b outside the remaining wood chip 10', namely up to the tip 16, Define with a length l ₂ , the total length of the original wood chip being 10 l ₁ + l ₂ . An optimal position of the parting plane 24 is, for example, when l _{2 is} between 40% and 100% of l ₁ . Another possible definition is to define the thickness d of the remaining wood chips 10 ′ in the transition from the convex surface 24 to an interface 28 along the parting plane 24, for example between 2 and 10 mm.

In the arrangement made in FIG. 2, the interface closes 28 an acute angle α with the center line 26, e.g. can be between 15 ° and 50 °.

In preferred embodiments of the invention, the flat end face 18 by cutting or sawing and the interface 28 generated by sawing in the axial direction. You are consequently each flat and parallel to each other.

In Fig. 3 is dash-dotted with 30 of the substantially circular Radial section indicated by a tree trunk. Laterally the so-called rinds are located on the trunk 30 32, i.e. Surface sections affected by forest edges.

At four circumferential positions offset by 90 ° to each other So-called corners 34 of the tree trunk 10 are provided. If the Rinds 32 (usually by machining) and the corners 34 (usually by milling or chipping) are removed, There remains a so-called model, from which the side boards follow 36 and then other boards and / or a so-called Main goods can be sawn.

In Fig. 3 with 38 and 40, the two edge surfaces of the axial continuous corners 34 designated.

Fig. 4 shows this again on a greatly enlarged scale Area of a corner 34 of the tree trunk 30. For attaching the Corners become a corner milling cutter 44, generally speaking a rotating cutting tool, used. The corner milling cutter 44 is rotatable about an axis 46 in the direction of an arrow 48. The Axis 46 is perpendicular to the longitudinal axis of tree trunk 30.

The corner milling cutter 44 is made of two in a manner known per se Assembled tools, namely a Spaner 50 and one Saw blade 52 or a corresponding number of planing knives.

When the corner milling cutter 44 (arrow 48) rotates, the knives plunge the chip 50 in the area of the first edge surface 38 in the corner 34 a while the second edge surface 40 of the corner 34 is treated by the saw blade 52 or the planing knives.

In this way, the second edge surface 40 receives a relative high (sawn) surface quality, while the first edge surface 38 as a result of rotating with a rotational movement Span knife receives a wavy surface.

FIG. 5 shows a top view of the arrangement according to FIG. 4. With an arrow 54 is the rotary movement of the revolving around the axis 48 Corner milling cutter 44 indicated. Its radius is with r designated.

The direction of advance of the tree trunk 30 is indicated by an arrow 56 compared to the fixed corner mill 44 (or vice versa) designated. 5 shows on the Tree trunk 30 also has a flattened area 58, where previously through the corresponding rind 32 is removed from the side has been. The flattened area 58 is axially extending Transition line 60 from the remaining forest-edged area 62 separated, in which the corner 34 by means of the corner cutter 44 to be worked out.

As can be clearly seen from Fig. 5, this is conventional Way of the chips 10 shown in FIG. 1.

In contrast, in the device according to the invention 6 a circular saw blade 70 in front of the circumferential corner milling cutter 44 arranged, which rotates about an axis 72, as with a Arrow 74 indicated. The axis 72 runs perpendicular to the longitudinal axis of the tree trunk 30. The circular saw blade 70 thus saws one Gap 76 along the transition line 60. The circular saw blade 70 typically has a thickness greater than 5 mm, preferably 6 mm and more, so that the gap 76 is correspondingly wide, at least considerably wider than in the case of a band saw. The Circular saw blade 70 can also be special depending on the individual case wide teeth.

A circular wedge 78 can follow on the circular saw blade 70 axial direction ends where the engagement area of the corner milling cutter 44 begins.

The arrangement is such that the gap 76 there lies where in the conventional procedure (Fig. 5) the thin End 22 of the wood chips would lie. Because in this area through the circular saw blade 70 the wood already there has been removed, the Spanischer 50 of the Spanischer des Corner milling cutter 44 as well as the saw blade 52 or the planing knife empty.

As a result, the wood chips 10 ′ become without the thinner end 22 manufactured, so it only consists of the thicker end 20.

It goes without saying that the circular saw blade 70 only so far is to be understood as an example, and of course also other chipper tools can be used if e.g. the width of the gap 76 should be larger.

The procedure illustrated in FIG. 6 also results Another advantage is that the first edge surface 38 of trained in advance with a saw-quality surface becomes.

Claims (24)

1. A wood flake having a first, concave surface (12) and the second, convex surface (14), delimiting between them an essentially wedge-shaped flake (10; 10'), the surfaces (12, 14) converging in an imaginary tip (16) outside the flake (10'), the tip (16) lying outside the flake (10') on a center line (26) extending between the surfaces (12, 14) at a distance of a center line section (26b), characterized in that the length (l₂) of the center line section (26b) lying outside the flake (10') is between 40% and 100% of the length (l₁) of the center line section (26a) lying inside the flake (10').
2. The flake of claim 1, characterized in that the center line (26) intersects the flake (10') in a boundary surface (28) at a junction between the center line sections (26a, 26b).
3. The flake of claim 2, characterized in that the boundary surface (28) encloses a finite angle (α) with the center line (26).
4. The flake of claim 2 or 3, characterized in that it has a thickness of between 2 and 10 mm between the surfaces (12, 14) at a transition between the concave surface (14 ) and the boundary surface (28).
5. The flake of one or more of claims 2 through 4, characterized in that the boundary surface (28) is plane.
6. The flake of one or more of claims 1 through 5, characterized in that the center line (26) intersects the flake (10') in a front face (18) at an end opposite the boundary surface (28), the front face (18) extending parallel to the boundary surface (28).
7. Usage of flakes according to one or more of claims 1 through 6 as strands in the production of composite beams or boards, as well as of wood materials.
8. A method of producing an essentially wedge-shaped wood flake (10; 10') in which the flake (10; 10') is chipped out of the wood by means of a rotating chipping tool (44 - 52) such that it has a first, concave surface (12) and a second, convex surface (14), delimiting between them the flake (10; 10'), the surfaces (12, 14) converging in an imaginary tip (16), the tip (16) lying outside the flake (10') on a center line (26) extending between the surfaces (12, 14) at a distance of a center line section (26b), wherein, further, the wood, prior to the chipping out, being removed in the area in which the surfaces (12, 14) converge in the imaginary tip, characterized in that the chipping tool (44 - 52) is guided into the removed area so far that in the flakes so produced the length (l₂) of the center line section (26b) lying outside the flake (10') is between 40% and 100% of the length (l₁) of the center line section (26a) lying inside the flake (10').
9. The method of claim 8, characterized in that the area is removed such that the tip (16) comes to lie on a center line (26) extending between the surfaces (12, 14) outside the flake (10') to be chipped out after the removing, at a distance of a center line section (26b), the length (l₂) of which being between 40% and 100% of the length (l₁) of the center line section (26a) inside the flake (10').
10. The method of claim 9, characterized in that the center line (26) intersects the flake (10') to be chipped out after the removing in a boundary surface (28) at a junction between the center line sections (26a, 26b).
11. The method of claim 10, characterized in that the boundary surface (28) is produced such that it encloses a finite angle (α) with the center line (26).
12. The method of claim 10 or 11, characterized in that the flake (10') is chipped out with a thickness of between 2 and 10 mm between the surfaces (12, 14) at a transition between the concave surface (14 ) and the boundary surface (28).
13. The flake of one or more of claims 8 through 12, characterized in that the boundary surface (28) is produced as a plane surface.
14. The method of claim 13, characterized in that the boundary surface (28) is produced by sawing.
15. The method of one or more of claims 9 through 14, characterized in that the center line (26) intersects the flake (10') in a front face (18) at an end opposite the boundary surface (28), the front face (18) extending parallel to the boundary surface (28).
16. A method of profiling a log (30), comprising the steps of:

    a) effecting a saw cut along the log (30);

    b) chipping longitudinally extending corners (34) having a first (40) and a second (38) lateral surfaces out of the log (30) by means of a cutting tool (44 - 52) extending with its cutting radius (r) into the groove (76) generated by the saw cut and running free therein, wherein the second lateral surface (38) extends along the saw cut, wherein, further, flakes (10; 10') are produced during the chipping out, having a first, concave surface (12) and a second, convex surface (14), delimiting between them the essentially wedge-shaped a flake (10; 10'), the surfaces (12, 14) converging in an imaginary tip (16) outside the flake (10'), the tip (16) lying outside the flake (10') on a center line (26) extending between the surfaces (12, 14) at a distance of a center line section (26b);

    c) sawing off lateral boards (36) from the log (30) wherein one narrow side of the boards (30) are configured by the first lateral surface,

    characterized in that the chipping tool (44 - 52) is guided to extend into the groove (76) so far that in the flakes (10') so produced the length (12) of the center line section (26b) lying outside the flake (10') is between 40% and 100% of the length (l₁) of the center line section (26a) lying inside the flake (10').
17. Usage of the method of one or more of claims 8 through 15 for chipping corners (34) during the profiling of logs (30).
18. An apparatus for producing an essentially wedge-shaped wood flake (10; 10'), comprising a rotating chipping tool (44 - 52) for chipping the flakes (10; 10') out of the wood such that the flake (10; 10') has a first, concave surface (12) and a second, convex surface (14), delimiting between them the flake (10; 10'), the surfaces (12, 14) converging in an imaginary tip (16), the tip (16) lying outside the flake (10') on a center line (26) extending between the surfaces (12, 14) at a distance of a center line section (26b), and means for removing the wood prior to the chipping out in the area in which the surfaces (12, 14) converge in the imaginary tip (16) characterized in that the the chipping tool (44 - 52) extends into the removed area so far that in the flakes (10') so produced the length (l₂) of the center line section (26b) lying outside the flake (10') is between 40% and 100% of the length (l₁) of the center line section (26a) lying inside the flake (10').
19. The apparatus of claim 18, characterized in that the means comprise a saw.
20. The apparatus of claim 19, characterized in that the saw is configured as a circular saw having a circular saw blade (70).
21. The apparatus of claim 20, characterized in that the circular saw blade (70) is at least 5mm, preferably at least 6 mm thick.
22. The apparatus of one or more of claims 19 through 21, characterized in that a wood cleaver (78) is provided between the saw and the chipping tool flush with the saw.
23. An apparatus for profiling a log (30), comprising:

    a) means for effecting a saw cut along the log (30);

    b) a cutting tool (44 - 52) extending with its cutting radius (r) into the groove (76) generated by the saw cut and running free therein, for chipping out of the log (30) longitudinally extending corners (34) having a first (40) and a second (38) lateral surface, wherein the second lateral surface (38) extends along the saw cut, wherein, further, flakes (10; 10') are produced during the chipping out, having a first, concave surface (12) and a second, convex surface (14), delimiting between them the essentially wedge-shaped flake (10; 10'), the surfaces (12, 14) converging in an imaginary tip (16) outside the flake (10'), the tip (16) lying outside the flake (10') on a center line (26) extending between the surfaces (12, 14) at a distance of a center line section (26b);

    c) means for sawing off lateral boards (36) from the log (30) wherein one narrow side of the boards (30) is configured by the first lateral surface,

    characterized in that the chipping tool (44 - 52) extends into the groove (76) so far that in the flakes (10') so produced the length (l₂) of the center line section (26b) lying outside the flake (10') is between 40% and 100% of the length (l₁) of the center line section (26a) lying inside the flake (10').
24. Usage of an apparatus according to one or more of claims 18 through 22 for chipping out corners (34) during the profiling of logs (30).

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