JPS6028643B2 - Manufacturing method of rotary veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rotary veneer.

Conventionally, in the manufacturing method of rotary slicing logs to obtain rotary veneers, in the processing process of cutting the logs, strain stress causes irregularities on the end surface of the logs, that is, irregular intervals of occurrence. Radial cracks occur, so even if the thus obtained ball-cut log is rotary sliced to obtain the band-shaped rotary veneer 1,
As shown in Fig. 1, cracks 2 with completely random spacing appear continuously on both ends of the cracks, and when attempting to cut them in the width direction to obtain a rotary veneer of a predetermined size, cracks may result in defective cracks. This method has the disadvantage that the area to be removed increases significantly and the utilization yield of logs decreases significantly.

Therefore, an object of the present invention is to provide a method for manufacturing rotary veneer that can greatly improve the utilization rate of raw wood.

An outline of this invention is shown in FIGS. 2 to 7.

That is, in this rotary veneer manufacturing method, before the raw wood is cut, steel bands 4, 4 is tied with a rope and pressed vertically, and in this state it is cut into pieces, and as shown in FIG. A crack 2' is added to divide the wood at equal angles, and the crack 2' is placed at a position facing each other between both wood end faces.Then, the band 4 is untied and this ball-cut log 5 is divided into four pieces. As shown in the figure, slice the rotary veneer 1 into a strip with a knife 6.
' is obtained, and cut in the width direction at portions corresponding to the cracks 2' exposed at both end portions of the belt-shaped rotary veneer 1'.
In the above embodiment, three cracks 2' are added to each butt end surface to divide the butt end surface into three equal parts. As shown in FIG. 7, only one crack 2' may be added so that the interval between cracks 2' corresponds to the circumferential length of the log 5 to be rotary sliced.

Because of this, the cracks 2' that occur at the side ends of the continuously formed strip-shaped rotary veneer 1' are equally spaced, and since the cracks 2' at both side ends appear at positions facing each other, the cracks remain as they are. By setting the generation interval of 2' to the width dimension of the rotary veneer to be obtained, the utilization yield of the raw wood 3 can be greatly improved.

Furthermore, before rotary slicing processing of ball cut log 5,
By adding a crack 2' artificially to the butt end surface in advance,
These cracks 2' absorb unreasonable strain stress well,
It is possible to prevent the occurrence of cracks in undesirable places during the slicing process, that is, in places corresponding to the middle of the width direction of the rotary veneer finally obtained, which is even more effective in improving the utilization rate of logs 3. There is.

As mentioned above, crack 2 added to the end surface of ball-cut log 5
' may be set to an arbitrary number to match the interval of cracks 2' appearing at the side edges of the obtained strip-shaped rotary veneer 1', in other words, the width dimension of the rotary veneer finally obtained. An example in which two cracks 2' are added as shown in FIG. 6 is also possible, and if the width dimension is to be maximized, only one crack 2' needs to be added as shown in FIG. 7.

In addition, if cracks are already found in the obtained ball-cut log 5 for some reason, the cracks can be added to a part of the cracks 2' to be newly added. It is possible to improve the utilization yield of logs 3 without being affected by the presence of cracks in the wood.

As described above, the rotary veneer manufacturing method of the present invention includes a log cutting step of cutting the log into a predetermined width dimension;
A cracking process is performed to divide the end surface of the log obtained by this process at equal angles so that each crack faces each other between both end surfaces, and after this process, the log is rotary sliced. This process includes a rotary slicing process in which the strip of rotary veneer obtained by this process is cut, and a cutting process in which the belt-shaped rotary veneer obtained by this process is cut at the portions corresponding to the cracks at both ends of the rotary veneer. Cracks appear on the side edges of the rotary veneer strip obtained by rotary slicing at corresponding intervals, and by using the interval as the width of the rotary veneer, the inconvenience caused by cracks is greatly reduced. This has the effect of significantly improving the utilization yield of logs.

Example 1 A lapla log was cut with a steel band bound with a cotton bonding pressure of 100k9' to obtain a ball-cut log, one crack was added facing each other on both ends of the log, and then the above steel was cut. The band is unraveled and rotary sliced to obtain a band-shaped rotary veneer, which is then cut in the width direction to give a maximum of 4
- A rotary veneer with a width of 200 was obtained.

In this case, the utilization rate of the raw wood is 60%, compared to the utilization rate of 35% when using the conventional manufacturing method (3 irregular cracks occur on one side of the wood and 2 on the other side). As a result, the utilization yield was approximately doubled.

Example 2 Two cracks were added to the butt end surface using the same process as in Example 1 above.

The usage rate in this case was 50%, which was a significant improvement over the conventional example.

Example 3 Three cracks were added to the butt end surface using the same process as in Example 1 above.

The utilization yield in this case is 40%, which is still 3% compared to the conventional example.
There was an improvement in usage compared to 5%.

In addition, in the above-mentioned example, without subjecting the end surface of the obtained ball-cut log 5 to the cracking process as described above, the band was left tied with the band as shown in FIG. 8. By retracting the edge of the slice width slightly inward from the rope attachment part to reduce the slice width and rotary slicing, the strip-shaped rotary veneer 1'' can be made without any cracking defects as shown in Fig. 9. However, in this manufacturing method, the band twilled portion remains unsliced and is disposed of as an unnecessary material, so there is a drawback that the utilization yield of the raw wood 3 decreases accordingly. .

A specific example in which rotary slicing is performed by reducing the slice width vertically while leaving the band binding part will be described in detail below.

[11 A 60-barrel Labra log was tied with a steel band at a tying pressure of 100 kg/cm, and one length of 260 ribs was cut to obtain a ball-cut log, leaving the band striped part and having a width of 2
A belt-shaped rotary veneer is obtained by rotary slicing an area of 50 maki, and this is cut in the width direction to obtain a rotary veneer having a length of 250 m.

In this case, assuming that there are no cracks or defects in the raw wood used, the material yield of the raw wood would be 70%, the end loss -4%, and the usage rate 66%, and in the case of the conventional manufacturing method, a veneer with a minimum width of 20 mm would be good quality. Log material length when determining that 70
% Crack defect loss -35% Utilization yield 35% The utilization yield can be improved by approximately twice.

■ Antelias logs of 60 mm length were tied to a steel van with a continuous pressure of 200 k9', and a 260 mm length log was obtained from the same machine as in the case of [1] above, and from this, 250 mm lengths were obtained. Obtain the rotary veneer for the sail.

In this case, the usage yield is 65% for the raw wood, 4% for end loss, and 61% for the usage rate.In the case of the conventional manufacturing method, the raw material yield for the raw wood is 65%, the loss due to cracking is 30%, and the usage yield is 35. %, the utilization yield is also improved by approximately twice as much.

[The 3'100-thick ass log was made into rotary veneer by the same process as in the case of (2) above.

The usage yield in this case is Raw wood material yield 80% End loss 14% Usage yield: 76% In the case of the subordinate manufacturing method, Raw wood material yield 80% Crack defect loss -30% Usage yield: 50% The usage rate will be improved by about 1.5 times compared to the previous version.

[Brief explanation of drawings]

Fig. 1 is a plan view showing the state of occurrence of cracks in a band-shaped rotary veneer in the case of a follow-up example, Fig. 2 is a perspective view of the band attachment process showing an outline of the present invention, and Fig. 3 is the crack processing process. FIG. 4 is a perspective view showing the rotary slicing process, FIG. 5 is a plan view of the strip-shaped rotary veneer obtained by the process, and FIG. 6 is a round cut log with two cracks. FIG. 7 is a perspective view showing a ball-cut log with one crack, and FIG. 8 is a perspective view showing the state before rotary slicing in the manufacturing process of band-shaped rotary veneer without the crack processing process. , FIG. 9 is a perspective view showing the rotary slicing process. 1', 1''...Striped rotary veneer, 2'...
...Crack, 3...Log, 4...Steel band, 5...Ball cut log, 6...Knife. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] 1 A log cutting process in which the raw wood is cut into a predetermined width dimension, and a cracking process is applied to the round-cut log obtained by this process to divide the end surface of the log at equal angles so that each crack faces between the two end surfaces. A rotary slicing process of rotary slicing the cut raw wood after this process, and a cutting process of cutting the band-shaped rotary veneer obtained by this process at the parts corresponding to the cracks at both ends of the rotary veneer. Manufacturing method of rotary veneer.