JP2663322B2 - Method for drying cored squared material and apparatus for forming flaws for drying cored squared material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of drying a heart supporting material such as a cedar heart supporting pillar, for example, and more particularly to a method for drying a heart supporting material to be dried.
A flaw having a depth of 0 mm or more and less than 30 mm, more ideally, a method of drying a cored squared material that is dried in a state where a plurality of flaws including a flaw reaching the core material of the cored squared material is applied. The present invention relates to the provision of an apparatus for forming a flaw for drying a squared timber.

[0002]

2. Description of the Related Art Wood generally contains a large amount of water.
The water contained in the wood includes so-called free water contained in cell cavities or intercellular spaces, and so-called bound water contained in cells. Then, the free water in the wood is first removed and the bound water is gradually removed, whereby the wood is shifted to a dry state.

[0003] Such drying of wood reduces the weight of the wood and increases its strength when the wood is used as a building material. It has the purpose of preventing shrinkage cracks such as shrinkage, width warping, wave warping, warping such as heavy bending, and eliminating the room for irregular deformation, and further preventing various growth of fungi such as mold. For the purpose, the used wood is dried and used, for example, to an air-dry moisture content.

[0004] As a means for such drying, for example, there are a method of drying the raw material in the form of a log and then lumbering the raw material, and a method of drying the log after forming it into a square material, a plate material or the like. Here, as the method of drying the former log, for example, a so-called dead-line method of drying in the state of standing trees and a so-called leaf-killing method of drying after cutting are generally used. ,
In each case, the drying process takes several months,
In addition, the degree of drying cannot be reduced to the air-dry moisture content or less, and the degree of drying naturally has a certain limit. Did not.

[0005] Logs cut from such points are used as boards,
After sawing into groats and horns, these plates, groats,
It is a common practice to use a sharpened lumber or the like naturally or forcibly dried to reduce the moisture contained in the wood to a predetermined value or less. In the drying of such grindstones, for example, the so-called grindstones are left in the air, and the moisture contained in the grindstones is naturally evaporated and dried.
The method of air drying and drying of the sawn timber etc. while adjusting the temperature and humidity in special drying conditions, for example, in a drying room heated by steam and in which an appropriate amount of steam is sent, The so-called steam method, for example, the so-called hot air method, in which heated air is sent into a drying chamber, or the air in the drying chamber is dried, and the shaving materials are dried in these drying chambers, the so-called hot air method, and the smoking method, and boiling. Method, so-called artificial drying method for drying grindhorns and the like by various forced drying methods such as vacuum method, and further, a drying method using both artificial drying and the above-mentioned atmospheric drying are generally used. .

[0006] In this type of drying method, for example, the drying of the ground wood by air drying has the advantages that the drying cost is inexpensive and the cracks accompanying drying are small.
It takes a lot of days to dry, and it is difficult to dry to the heart of the wood, and the difference in moisture content between the sapwood and the heartwood in the dried wood may be large. In addition, there is a disadvantage that a large space is required for the drying process. On the other hand, in the drying of sharpened wood and the like by the so-called artificial drying method using forced drying means,
While the number of days required for drying may be small, and it is possible to dry relatively to the heart of the wood, there are advantages such as relatively little difference in moisture content between the sapwood and the heartwood in the dried wood, It has the disadvantages that cracks and irregularities tend to occur during drying, and the drying yield is low despite the high cost of the drying treatment. From the point
Attempts have been made to eliminate inconveniences in each drying means by using artificial drying means and air drying means together, but each has its own advantages and disadvantages, especially heart-holding squares used as pillars etc. There was no satisfactory drying means.

[0007]

In view of the above, a relatively deep seam is formed on the back side of the wood, usually at the end thereof, so as to extend in the original direction. A so-called back splitting means for preventing cracking of the wood and preventing bending and warping caused by drying of the wood is used. In the drying method including such a back splitting method, the wood can be dried in a relatively short period of time, and can be dried to a relatively central part. It has features such as a small difference in water content between the two, and has features such as relatively few cracks.

However, when wood is dried by this kind of spine splitting method, the spine splitting portion often opens with the drying process.
As shown in FIG. 13, when the spine split 1a is applied and dried, as shown in FIG. 13, the portion of the spine split 1a expands with drying, and the dried square wood deformed at the spine split 1a portion is used as, for example, a pillar 1 ′ of the large wall method. In this case, there is an inconvenience that the flatness of the cross-fitting wall surface is impaired by the warped surfaces 1b and 1c of the pillar 1 'due to the opening of the pillar 1' toward both sides of the back split 1a. Further, the back split column member 1 'used as the column member 1' of the large wall method as described above.
In many cases, the opening width of the back split 1a changes according to the water content of the column 1 ', and the behavior of the back split 1a causes cracks in the stitching cloths and friction on the walls. There was an inconvenience. Similarly, in the case of the tiled tile wall, there is a disadvantage that the main portion is cut out.

[0009] From this point, the grindstone 1 provided with the spine split 1a has the warped surfaces 1b and 1c deformed with drying.
By correcting again with the lines xx and yy in FIG. 13, the respective surfaces are made to be orthogonal to each other, and this corrected sharpened bar 1 is used as a column 1 ′ as shown in FIG. 16. Have been tried. When a wall or the like is formed by sticking a cloth or the like to the surface of the column 1 ′ by such a method, the formed wall has a flat surface at the beginning of the construction.
As shown in FIG. 17, the split width of the spine split 1a changes in the expanding direction or the closing direction as shown in FIG. 2a, and there is an inconvenience such as the formation of an edge 2b at the joining edge of the decorative covering material 2.

The present invention has been made in view of the inconvenience of the conventional method for drying timber, particularly, heart-holding timber, and dries to a heartwood portion in a relatively short period of time. It is an object of the present invention to provide a drying method which is made substantially uniform and in which cracks on the surface of the squared material due to the drying treatment are minimized.

[0011]

SUMMARY OF THE INVENTION The present invention achieves the above-mentioned objects. According to the present invention, there is provided a method for manufacturing a heart-height timber 10 which includes all or a part of surfaces 10e to 10e excluding a cut-out surface 10d. In addition, a plurality of flaws 11a having a depth of 10 mm or more and less than 30 mm, all or a part of which are not continuous with each other, are provided at a substantially central portion of the surface over the longitudinal side of the surface. The center holding square member 10 provided with the flaw 11a is dried by an appropriate drying means.

Next, according to the second aspect of the present invention, the flaws 11a provided on the above-mentioned centering angle bar 10 are formed by using a core member 10a and a sap member 10a.
b, the whole or a part of the core material 10b and the core material 10a, from the side of the core material 10b to the core material 10a, are dried.
The core material 10a is provided so as to reach the side of the core material 10a beyond the transition material 10c existing between the two, and the drying process is performed by a suitable drying means on the core holding angular material 10 provided with the flaws 11a.

Next, a third aspect of the present invention is directed to a surface of the centering angle lumber 10 which is perpendicular to the direction of the medulla 10f, that is, a surface excluding the end surfaces 10d, which are referred to as the distal end and the original opening, that is, the centering. The surface 10 in the tangential direction of the annual ring 10g of the square lumber 10
e, 10e, 10e, all or a part of the surface 10e of 10e
Surface 1 excluding both side portions 10e 'and 10e' in the width direction of
0e ″ is provided with a flaw 11a that has a depth of 10 mm or more and less than 30 mm and that is not continuous with each other, and the core holding square member 10 provided with the flaw 11a is appropriately dried by appropriate drying means. It is configured to perform a drying process.

Further, according to a fourth aspect of the present invention, the centering angle lumber 10 is provided on all or a part of the surface of the centering angle lumber 10 excluding the cleave surface.
A flaw forming device 21 for forming a flaw 11 used for drying, the flaw forming device 21 is pressed against the centered square bar 10 so as to be able to be separated from the centered square bar 10, and the whole or all of the centered square bar 10 is The piercing piece 22 has a depth of 10 mm or more and less than 30 mm and forms a plurality of flaws 11 that are not continuous with each other.

[0015] The invention according to claim 5 is characterized in that the centered square bar 1 is provided on all or a part of the surface of the centered square bar 10 excluding the cleave surface.
Flaw forming device 30 for forming flaws 11 used for drying
The flaw forming device 30 is provided on the outer peripheral surface of a roller-shaped rotating body that is pressed against the centering square member 10, in which all or a part of the centering square member 10 is at least 10 mm, 30 mm
A plurality of flaws 1 having a depth of less than one and not continuous with each other
1 is provided.

In the present invention, the sapwood 10b mainly has living parenchyma cells in the wood before cutting,
The core material 10a contains a storage material such as starch therein and is used as an energy source for growth. The core material 10a is located inside the sapwood and mainly the living parenchyma cells die and the storage material is converted into the core material. The transition material 10c means a portion at the boundary between the core material 10a and the sap material 10b, where mainly living cells are dying.

Further, in the present invention, the surface 10e excluding the cut ends 10d and 10d of the center angle timber 10 is a surface cut in the tangential direction of the annual ring 10g of the center angle timber 10, that is, the core 1
It is a plane parallel to 0f and is usually referred to as a plate. Further, in the present invention, the width direction of the surface 10e means a direction perpendicular to the length direction, where the direction of the center-opening angle member 10 in the unopened and original direction is the length direction. Furthermore, in the present invention, the term “flaw” refers to any aspect in which a part of the structure of the centering square member 10 is damaged from the surface 10 e of the centering square member 10 toward the inside of the centering square member 10.

[0018]

[Effect] The center angle timber 10 is provided with a flaw 11 on the surface excluding the cut edges 10d and 10d.
Since all or a part of 1 is formed as a flaw 11a having a depth of 10 mm or more and less than 30 mm, drying of the entire portion of the holding square 10 including the core 10a is promoted in a relatively short period of time.

The flaws 11 provided on the centering angle timber 10 are mainly flaws 11a having a depth of 10 mm or more and less than 30 mm.
Therefore, the flaws 11a do not open out like the back split material, and therefore, there is no deformation of the center supporting square member 10 due to the opening of the flaws 11a.

By providing the flaws 11 provided on the centering angle timber 10 so as to pass from the sapwood 10b through the transition material 10c to reach the core material 10a, the core material 10a is uniformly and quickly reduced to a predetermined moisture content. Dried.

[0021]

EXAMPLES Examples of typical drying methods according to the present invention will be described in detail below. FIG. 1 is a perspective view of a centering angle member 10 according to a first embodiment, FIG. 2 is a front view of the centering angle member 10, and FIG. FIG. 4 is a front view showing a center supporting square member 10 according to the second embodiment. Next, FIG.
It is the state which looked at the state of the drying experiment of the above-mentioned center angle square wood 10 from the upper part, and puts each experimental material on the gantry, the 1st group-the 8th
This shows a state in which they are arranged in groups. FIG. 6 shows a typical means for forming a flaw on the center angle beam, and FIGS.
The shapes of various blades provided in this means are shown. Further, FIG. 10 shows another means for flawing the center angle timber. FIG. 11 illustrates the measurement part of the moisture content of the center angle timber for easy understanding.

In this case, the supporting angle timber 10 to be dried is
Even hardwood such as conifers such as sugi, akamatsu, karamatsu, ezomatsu, domematsu, kuromatsu, hinoki, hiba, tsuga, fir, straw, etc. It may be. This heart-holding square lumber 10 has cut ends 10d and 10d cut at a distal end and a former end, and an annual ring 10g appears in an annular shape at the cut end 10d, and a nucleus center 10f is provided substantially at the center thereof. There is a core material 10a so as to surround the periphery. Furthermore, this heartwood 1
There is a transition material 10c outside 0a, and there is a sap material 10b from the transition material 10c toward the outer edge. This angular material 10
Are surfaces 10e, 10 in the tangential direction of the annual ring 10g.
e, 10e, and 10e, and a surface cut in a direction perpendicular to the axis center line is cut off such that a surface (corresponding to a cut edge surface) forms a substantially square shape, and is located on the circumferential side of the center holding angle member 10. The surface 10e has a configuration in which surfaces 10e and 10e adjacent to each other intersect at right angles.

A flaw 11 is provided on such a supporting angle member 10. The flaws 11 provided on the center angle square member 10 may be relatively short cut-like flaws 11 ′ as shown in FIGS. 1 to 3. In addition, as shown in FIG.
1 ". Further, the flaws 11 may correspond to the flaws 1 described above.
It may be provided intermittently as in 1 ′, 11 ″, or may be provided in a continuous manner, that is, in a streak-like manner on the surface 10e of the center angle timber 10 so as to extend between the lips.

In this case, the flaws 11 provided on the center angle timber 10
It is preferable that the depth of the flaw 11 is deeper than 10 mm, and that the flaw 11 includes a number of flaws 11a that are shallower than 30 mm.
More typically, all the flaws 1 provided on the
1 is a flaw 1 having a depth of not less than 10 mm and less than 30 mm
1a may be provided on the center-angle beam 10.

In addition, from the point that more flaws 11 are provided on the surface of the holding square member 10, the flaws 11b having a relatively shallow depth, for example, less than 10 mm, and the flaws 11a having a depth of 10 mm or more are provided.
May be provided so as to be adjacent to each other. When the shallow flaws 11b and the relatively deep flaws 11a are provided so as to be adjacent to each other, the number of flaws 11 per unit area is substantially the same as that of the center angle square member 10 provided with only the same number of deep flaws 11a. Can be brought to the center angle timber 10 provided with the flaws 11 including the shallow flaws 11b. In addition, by providing relatively shallow flaws 11b in the portion adjacent to the deep flaws 11a in this manner, even when the number of flaws 11 per unit area in the center angle square bar 10 is increased, the deep flaws 11a are not mutually connected. When the deep flaws 11a are not adjacent to each other and are formed adjacent to each other, the flesh on the surface of the centering angle bar between the formed flaws is cut off by the flaw forming means, There is no occurrence of a recessed defect on the surface of the centering angle timber.

The wooden ends 10d, 10d
Flaws 11 provided on the surface 10e excluding the
A flaw which rises and descends in a press shape having a plurality of piercing pieces 22 protruding from the surface of the centering square member 10 on the side in contact with the centering square member 10 with respect to the centering square member 10 placed on the center 0 An apparatus 21 is provided, and a plurality of flaws 11 are provided on the surface 10e of the centering angle bar 10 by the flaw forming apparatus 21. In this case, the piercing piece 22 provided in the flaw forming device 21 is
For example, a thin rod-shaped piercing piece 2 having a sharp tip like a nail as shown in FIG.
2a or a plate-shaped piercing piece 22b having a predetermined blade length as shown in FIGS. In the case of the plate-shaped piercing piece 22b as described above, for example, the piercing piece 22b having a relatively short blade length with a blade length of about 10 mm may be used. It may be provided so as to cover the entire width of the surface in contact with the center angle square member 10 (not shown). Further, the piercing piece 22b having the predetermined blade length may protrude in an arc shape, for example, as shown in FIG. 7 at a central portion in the blade length direction, and further protrude in a mountain shape as shown in FIG. Is also good. Further, these various piercing pieces 22 may be provided in the same flaw forming device 21 in a mixed manner.

The piercing piece 2 provided in the flaw forming device 21
2 has a protruding dimension commensurate with the depth of the flaw 11 formed on the surface 10e of the center supporting square member 10 to be processed, for example, a piercing piece 22 ″ having a protruding dimension of about 5 mm to 15 mm, and 15 mm A piercing piece 22 'having a protrusion size of about 40 mm is prepared.
A relatively shallow, for example, flaw 11b having a depth of less than 10 mm using a piercing piece 22 "having a protrusion size of about 15 mm.
Is formed on the surface 10e of the center angle square member 10. Also, 15mm
A flaw 11a having a relatively deep depth, for example, 10 mm or more and less than 30 mm is formed using the piercing piece 22 ′ having a protrusion size of about 40 mm.

The thin rod-shaped piercing piece 22a causes a flaw 11 '' as a hole-shaped puncture on the center-angle square member 10.
Is provided. In addition, the plate-shaped piercing piece 22b provides
A cut-like flaw 11 ′ is provided on the center angle square bar 10. Here, the flaws 11 provided on the center angle timber 10 are the surface excluding the opening 10d of the center angle timber 10, that is, the annual rings 10g of the center angle timber 10.
Is provided on all of the circumferential surfaces 10e, 10e, 10e, 10e of the angular support members 10 which are surfaces in the tangential direction, or any one or more of these surfaces 10e to 10e. I just want it. Here, the surface in the tangential direction of the annual ring 10g is the surface in the tangential direction of the annual transmission 10g represented on the upper surface of the center angle timber 10 shown in FIG.
Surfaces 10e to 10e excluding the surface 10d.

Further, the flaw 11 is formed on a substantially central portion of the individual face 10e of the center angle square member 10 or a face 10e ″ excluding the both sides 10e ′ and 10e ′ in the width direction of the face 10e.
Is provided only in. As described above, the flaw 11 is provided at a substantially central portion of the surface 10e, or the side portions 10e 'in the width direction are provided.
By providing the flaws 11 only on the surface 10 e ″ without providing the flaws 11 on the surface 10 e ″, inconveniences caused by providing the flaws 11 at the corners of the centering angle bar 10, for example, deterioration of the strength of the centering angle bar 10 as a structural material can be reduced. Can be avoided, and
In the case where the flaw 11 is provided only at the central portion of the centered square bar 10, since the flaw 11 is provided substantially at the center of the centered square bar 10, most of the flaw 11 The core material 10a is provided so as to reach the side of the core material 10a.
1 is provided with a feature that brings about substantially the same drying as the case where 1 is provided.

Next, the flaws 11 provided on the center angle beam 10
Is not a fine puncture, but has a certain length, the flaw 11 is oriented in the direction of the wood fiber of the supporting angle timber 10, ie, the flaw 1
It is preferable that the direction of 1 is arranged in the direction between the cleaves 10d and 10d of the centering angle lumber 10. In this way, by setting the flaw 11 to the direction of the wood fiber of the centering angle lumber 10, the inconvenience caused by providing the flaw 11 is provided. For example, it is possible to avoid the deterioration of the strength of the angular support 10 as a structural material.

When the surface 10e is the sap 10b, the flaws 11 provided on the surface 10e of the above-mentioned center angle square 10 reach the core 10a from the surface of the sap 10b and beyond the transition material 10c. It is preferable that it is provided as follows. As described above, since the flaws 11 provided on the surface 10e of the centering angle bar 10 are provided so as to reach the core member 10a beyond the transition material 10c portion of the centering angle member 10, the core member 10a can be more dried. It has a uniform and accelerated feature.

In addition, the flaws 11 provided on the center angle timber 10
By making the depth of this flaw 11 deeper,
Although it is possible to further promote the drying of the core material 10a portion of the core angle material 10, the effect of promoting drying due to providing a deep flaw of 30 mm or more from the surface 10e of the core angle material 10 tends to gradually decrease. In consideration of the inconvenience associated with the provision of the deep flaws 11 in the centering angle member 10, for example, deterioration of strength as a structural material, the depth of the flaws 11 provided in the centering angle member 10 is preferably less than 30 mm. Providing such deep flaws, particularly flaws of 30 mm or more, on each surface of the centering angle bar 10 requires a large-scale apparatus, and has a disadvantage that the equipment cost and the running cost of the processing equipment are relatively high. On the other hand, with respect to the center angle
When only the flaws smaller than 10 mm are provided and dried, there is an inconvenience that a relatively long date and time is required for drying the heart-holding angular material 10, and the core material portion and the core portion are not sufficiently dried.

As yet another example of such a flaw treatment for the centering angle member 10, for example, FIG. 10 shows a rotating flaw forming device 30. The flaws 11 are provided on the surface 10e of the centering angle bar 10 while moving, or the flaws 11 are provided on the surface 10e of the centering angle bar 10 while moving the rotating flaw forming device 30 with respect to the fixed centering angle member 10. good.

The flaw forming device 30 is provided on the peripheral surface of the flaw forming device 30 which is a roller-shaped rotating body.
In the protruding state, the piercing piece 22 having the same structure as that described in the above is pressed against the center angular member 10 with the pressing roller 31, and the surface 10e of the center angular member 10 in the flaw forming device 21 is used. The same flaw 11 is provided.

The direction of the piercing piece 22 provided in the roller-shaped flaw forming device 30 is such that the direction of the blade length is equal to the circumferential direction of the roller-shaped flaw forming device 30. By setting the moving direction of the forming device 30 or the centering angle bar 10 to the length direction of the centering angle bar 10, each flaw 11 can be provided toward the wood fiber of the centering angle bar 10. Also, the roller forming flaw forming device 30
The direction of the piercing piece 22 provided on the roller is configured so that the direction of the blade length is aligned with the axial direction of the roller-shaped flaw forming device 30, and the moving direction of the flaw forming device 30 or the centering angle member 10 is set in the centering direction. The flaws 11 can be provided in the width direction of the square lumber 10 in the direction of the wood fibers of the centering square lumber 10, respectively.

The piercing piece 22 to be attached to the flaw forming device 30 can have any structure of the piercing piece 22 to be attached to the flaw forming device 21. The protrusion size of the protrusion 22 is also determined by the flaw forming device 21.
As in the case of the piercing piece 22 provided in the
The one corresponding to the depth of the flaw 11 provided on the surface 10e is used.

In addition, the flaw 11 provided on the centering square member 10 by each of the devices 21 and 30 described above can be obtained by piercing the piercing piece 22 into the centering square member 10 and then pulling out the piercing member 22 to thereby remove the centering square member. After the ten wood fibers and the like are once expanded, the flaws are closed by the piercing pieces 22 to form the flaws 11 having a relatively narrow flaw width. Thus, flaw 1
By making 1 a flaw having a narrow flaw width, it is possible to eliminate disturbance on each surface 10 e of the centering square bar 10, in particular, warpage of the flaw edge due to the expansion of the flaw 11 portion, The function of accelerating the drying of the square bar 10 is not impaired. Further, the flaws 11 formed on the surface 10e of the heart supporting square member 10 may be made to have a wide flaw width, and a concave or groove-like flaw 11 may be provided on the surface 10e.
(Not shown)

As described above, the center holding square 1 having the flaws 11 is provided.
Dry 0. As a means for drying the heart-holding angle member 10,
All the drying means used for drying this kind of centering angle bar 10 can be used. For example, the above-mentioned cored squared material 10 provided with the flaws may be left in the air, and its moisture content may be naturally evaporated and dried. Further, various methods such as a steam method, a hot air method, a smoke method, a boiling method, and a vacuum method may be used. Forcible drying may be performed by using any drying means such as a drying method or a high-frequency method. In any of these cases, the moisture contained in the cored angle bar 10 is radiated to the outside in a short period of time by the flaws provided on the centered angle bar 10, particularly the flaws 11a having a depth of 10 mm or more. In particular, drying of the core material portion and the medulla core portion of the heart supporting angle member 10 is particularly promoted, and the heart supporting angle member 10 is sufficiently dried. Then, a flaw 1 provided on the centering square member 10 for the purpose of promoting drying of the centering square member 10 is provided.
1 has a depth of at least less than 30 mm, even if the above-mentioned centering squares 10 are dried by any drying means, the flaws provided on the centering squares 10 do not open, and this centering squares 10 Even if is used as a pillar material of the large wall method, it does not cause a flicker on the cross face or the like and does not cause a margin.

<Experimental Example for Drying Comparison> Eight pieces of cedar heart-holding timber having a square cross section with a side of 115 mm were prepared, each of the heart-holding timbers was cut every 600 mm, and four pieces of each heart-holding timber were prepared. Test material was obtained. The test material obtained here is
A group is formed for each test material obtained from one cedar wood, and among the test materials in each group, the base of the cedar wood is on the left side of FIG. 5, and the end of the cedar wood is on the right side. Each test material was arranged so that it might be located.

The test materials A, arranged as shown in FIG.
B and C have the following features.

The test material referred to as test material A is as follows: (1) A portion having a width of approximately 40 mm to 75 mm at the center (excluding the both sides in the width direction) of the surface (all four surfaces) excluding the wood edge (width direction of the surface) (A width of 40 mm to 75 mm toward the surface), and has a flaw of about 20 mm depth and a flaw of about 10 mm depth over the entire length in the longitudinal direction of the test material. The lengths of the flaws are aligned in the length direction of the surface and are provided in the form of cuts, and the flaws arranged in the width direction alternate with the flaws having a depth of about 20 mm and the flaws having a depth of about 10 mm. There are no flaws adjacent to each other in the length direction of the test material and are not on the same line with each other. (3)
This flaw is a flaw with a depth of about 20 mm and a length of about 15 mm to 25 mm,
It is about 10mm to 20mm long with a flaw of about 10mm depth,
Approximately 30 flaws are present in the 115 mm × 115 mm surface on which the flaws are provided.

The test material referred to as test material B is as follows: (1) Over substantially the entire surface (all four surfaces) except for the kiguchi,
The flaw has a depth of about 5 mm to 10 mm. (2) The length of this flaw is about 5 mm to 10 mm. (3) There are 50 flaws on each surface of 115 mm × 115 mm.

The test material indicated as the test material C has: (1) a spine split is provided substantially in the center of one surface of the test material so as to extend from the kiguchi to the kiguchi in the longitudinal direction thereof; )
This back split is one kerf, the depth is approximately 63 mm, and the groove width is approximately 3 mm.

The test material referred to as test material D is as follows: the test material prepared above is left as it is, that is, the cedar wood is simply replaced by 6
The one that has been cut to 00 mm is used.

The test materials prepared in this manner and arranged in an array as shown in FIG. 5 are respectively test materials, for example, test material A, test material B, test material from one cedar wood. C,
Test material D was made, and a group was formed for each cedar material.
Eight groups of a first group to an eighth group are formed, and the respective test materials A, B, C, and D are provided at the base opening side, the base side side, and the non-side side of each group. ,
They were arranged in the state shown in FIG. 5 so that they existed evenly on the non-mouth side.

Each test material of each group thus prepared was dried using a low-temperature dehumidifying dryer. The conditions at the time of drying with this low-temperature dehumidifying dryer are as shown in Table 1,
The drying process under these conditions was completed in a full 14 days, and each of the test materials subjected to the drying process was taken out of the dryer, and the degree of drying, cracking, and the like of each test material were examined.

[0047]

[Table 1]

Tables 2 to 5 show changes in the water content of the test materials A, B, C and D which were appropriately distributed to the respective groups and dried. The moisture content of the entire test material before and the moisture content of the entire test material after the drying treatment were measured, respectively, and the difference between the moisture content before drying and the moisture content after drying was subtracted, and the average thereof is shown by rounding. .
In addition, the length and width of cracks generated on the surface of each test material were measured, and after summing the results, the average of these was rounded off.

[0049]

[Table 2]

[0050]

[Table 3]

[0051]

[Table 4]

[0052]

[Table 5]

In Test Material A, the difference between the moisture content before drying and the moisture content after drying was larger than any of Test Material B, Test Material C, and Test Material D, and occurred on the surface of Test Material A. The length of the crack,
It was confirmed that the total width of the cracks was particularly small as compared with the test materials B and D.

For each of the test material A, test material B, test material C, and test material D included in each of the groups (first to eighth groups) obtained by drying, the sapwood portion And the water content in the core material portion and the core portion were measured, respectively, and the average of the water content in the sapwood portion, the core material portion, and the core portion in each test material was compared. First, each dried test material obtained by the above-described method is divided into 25 equal parts on a wood-cut surface so that each becomes a square having the same area, and each test material is divided in the length direction according to the dividing line. By doing so, the 25 cross sections of each section are square measurement sections a, i, c ..., nu, ne, no,
Measure the moisture content of each of the measurement categories a, i, u ..., nu, ne, no, then a, i, u, d, o, co, so, to, no,
The average of the water contents of the 16 measurement sections of ne, nu, d, na, ta, sa and mosquito is defined as the water content of the sapwood part. further,
The water content of the eight measurement sections of g, ku, que, se, te, tsu, ji, shi are averaged, and this is defined as the water content of the core. Then, the water content of the measurement section was defined as the water content of the core, and the water content in each section was measured. Tables 6 to 9 show the respective water contents in the sapwood part, the core part, and the core part measured for each test material, and the average water contents are rounded off.

[0055]

[Table 6]

[0056]

[Table 7]

[0057]

[Table 8]

[0058]

[Table 9]

The moisture content of each test material after drying was compared. As a result, the test material A was relatively efficiently dried in the sapwood portion, the core material portion, and the pulp portion as compared with the other test materials. In particular, it was confirmed that the dryness of the pulp and the core material was remarkably accelerated as compared with the test materials B and D in particular.

The moisture content of each test material after drying treatment before drying and the moisture content after drying were measured at the sapwood portion, the core material portion, and the core portion of each test material. The difference in the water content was examined. Also in this case, similarly to the above, each of the test materials was divided into 25 equal parts on the cut surface so that each of the test materials became a square having the same area as shown in FIG. The water content of each of the sections a, i, c ... nu, ne, and no was measured, and the measured measurement sections a, a, c ...
In Nu, Ne, and No, measurement categories A, I, U, D, O, K,
The average of the water content of the 16 sections of the sap, do, no, ne, nu, d, na, ta, sa and mosquito is defined as the water content of the sapwood before drying. In addition, the measurement divisions K, K, K, C, T, T, T, J,
The average of the moisture content of the eight sections of the sample is defined as the moisture content of the core before drying, and the moisture of the section of the measurement section is defined as the moisture of the core before drying. Further, similarly,
In each test material, the moisture content of each of the measurement sections a, i, u ... nu, ne, and no after drying in each of the above sections was measured, and the measurement categories a, a, u, d, and d were measured in the same manner as described above. Oh,
The average of the moisture content of the measurement categories of Ko, So, To, No, Ne, Nu, Ni, Na, Ta, Sa, and Mosquito is defined as the moisture content of the sapwood part after drying. , Se, te, tsu, ji,
The average of the moisture contents of the measurement sections of the measurement section is defined as the moisture content of the core portion after drying, and the moisture content of the section of the measurement section is defined as the moisture content of the core section after drying. From the moisture content of each measurement section before drying measured in this way, subtract the moisture content of each measurement section corresponding to this, and examine the difference in moisture content in each of the sapwood part, core material part, and core part. Table 10 to Table 13
It was shown to. (In the table, △ indicates that the moisture content after drying is higher than the moisture content before drying.)

[0061]

[Table 10]

[0062]

[Table 11]

[0063]

[Table 12]

[0064]

[Table 13]

The difference in water content between the measured test material before drying and the test material after drying was compared for each of the sapwood, core, and pulp of the test material. A is
Higher values in all of the sapwood, core, and pulp compared to the other test materials B, C, and D, indicating a higher degree of drying than the other test materials. Was confirmed. In particular, the difference between the moisture content before and after the drying in the core of the test material A was extremely high at 43.5 (wt%), and the promotion of the drying in the core was particularly high in the test material A. It is recognized that it has occurred significantly.

[0066]

As described above, the method for drying a heart-holding angle lumber according to the present invention is characterized in that, in particular, the surface of the heart-holding angle lumber except for the cleave surface contains flaws of 10 mm or more and less than 30 mm and is continuous with each other. A large number of flaws that have not been dried over the longitudinal side of the surface and provided in a substantially central portion of the surface, or 10 mm or more on the surface in the tangential direction of the annual ring in the center-angle beam. Drying a large number of flaws, including flaws of less than 30 mm, which are not continuous with each other, along the longitudinal side of the surface, except for both sides in the width direction of the surface. As a result, there is no inconvenience that the split part opens or warps as in the case of the back split material, and there is no inconvenience that the split part behaves in the opening direction or the closing direction as the material is dry and wet. Does not occur.

Further, in the drying treatment, the material exhibits a drying characteristic close to that of the back split material. In particular, when evaluated from the removal rate of water contained in the wood, the method for drying a heart-holding square material according to the present invention has the above-mentioned characteristics. The removal of water more than the back split material is recognized, and it has the feature that efficient water removal can be performed even in the core material and the medulla.

Further, the number of cracks generated by the drying process is small, the crack length and the crack width per piece are small, and the characteristics of the core material are not impaired at all by the cracks caused by drying. ing.

[Brief description of the drawings]

FIG. 1 is a perspective view of a center angle angular member according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of the main part.

FIG. 3 is a plan view of the same.

FIG. 4 is a front view of a center angle timber according to another embodiment.

FIG. 5 is a plan view showing an arrangement state at the time of drying of each test material showing an experimental example of a center angle square material;

FIG. 6 is a block diagram showing a typical apparatus for flawing a center angle beam.

FIG. 7 is a perspective view showing an exemplary embodiment of a blade.

FIG. 8 is a perspective view showing another embodiment of the blade.

FIG. 9 is a perspective view showing still another embodiment of the blade.

FIG. 10 is a block diagram showing another typical apparatus for scratching a holding square.

FIG. 11 is a perspective view showing a drying measurement section of a test material.

FIG. 12 is a configuration diagram showing a back-split state of a back-split material.

FIG. 13 is a configuration diagram showing opening of a spine split portion of a spine split material.

FIG. 14 is a configuration diagram showing a use state of a back split material.

FIG. 15 is a configuration diagram showing another use state of the back split material.

FIG. 16 is a configuration diagram showing a use state of a spine split member in which a distortion portion has been corrected.

FIG. 17 is a configuration diagram showing a state in which a back split material in which a distortion portion has been corrected starts to be opened in the back split portion with use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Core holding angle material 11 Flaw 20 Processing board 21 Flaw forming device 22 Blade 30 Flaw forming device 31 Pressure contact roller

Claims (5)

(57) [Claims] 1. A plurality of flaws having a depth of 10 mm or more and less than 30 mm and not being continuous with one another are formed on all or some of the surfaces except for the cleave surface of the center angled timber. Along the longitudinal side of the surface, provided at a substantially central portion of the surface,
A method for drying a heart-bearing angular member, wherein the flawed core-bearing square member is dried. 2. A heart supporting square member having a core member and a sap member,
In order to provide a plurality of flaws, the whole or a part of which extends from the side of the sap bar to the side of the core bar over the transition material between the sap bar and the core bar and reaches the side of the core bar. 2. The method for drying a squared timber according to claim 1, wherein: 3. One or more of the surfaces in the tangential direction of the annual ring in the center angle timber, and all or a part of the surface excluding both sides in the width direction of the surface is 10 mm or more,
A plurality of flaws having a depth of less than 30 mm and not continuous with each other are provided along the longitudinal side of the surface, so that the centering angle timber provided with the flaws is dried. The method of drying the squared timber. 4. A flaw forming device for forming a flaw used for drying the center angle timber on all or a part of the surface excluding the tip end surface of the center angle timber, wherein the flaw forming device comprises: Piercing piece which is releasably pressurized with respect to and has a plurality of flaws which are 10 mm or more and less than 30 mm in depth and which are not continuous with each other, and which are partially or completely formed with respect to the centering square bar. An apparatus for forming flaws for drying of a square supporting material, comprising: 5. A flaw forming device for forming a flaw used for drying the center angle timber on all or a part of the surface excluding the tip end of the center angle timber. On the outer peripheral surface of the roller-shaped rotating body pressed against, the whole or a part of the center-angle material is 10 mm or more, 30 mm
What is claimed is: 1. An apparatus for forming a flaw for drying a square body, comprising a piercing piece which forms a plurality of flaws having a depth of less than and not continuous with each other.