JPH06101967A - Method for drying cored rectangular timber - Google Patents

Abstract

PURPOSE:To carry out the drying down to a core part of a timber in a relative short time and suppress occurrence of carcking at a surface of the rectangular timber accompanying a drying processing operation by a method wherein marring with a specified depth size is carried out over an entire part or a part of a surface except an end surface of the cored rectangular timber, thereafter its drying is carried out. CONSTITUTION:A cored rectangular timer 10 has a core 10f at its almost central part. A cored timber 10a is provided to enclose the core part 10f. A transfer timber 10c is present outside the core timber 10a and it has a side member 10b extending from the transfer member 10c toward its outer edge. A marring with depth of more than 10mm and lower than 30mm is carried out at the entire surface or a partial surface except the end surface against the core rectangular member 10, thereafter the timber is dried. The marring 11 is formed like scar or pierced scar and at the same time its lengthwise direction is formed intermittently or continuously. In view of the fact that many marring 11 are made at the surface of the cored rectangular timber 10, the marring 11b having a depth of lower than 10mm and the marring 11a having a depth of more than 10mm are made to be adjacent to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying method most suitable for drying a cored square timber such as a cedar cored pillar or the like, and more specifically, to a cored square timber to be dried.
It relates to a flaw having a depth of 0 mm or more and less than 30 mm, and more ideally, a method for drying a cored timber which is dried in a state where a plurality of flaws including a flaw reaching the cored timber of this cored timber is applied.

[0002]

2. Description of the Related Art Generally, wood contains a large amount of water,
Moisture contained in this wood includes so-called free water contained in the lumen of cells or cell gaps and so-called combined water contained in cells, and is usually the drying process of wood. Then, first, the free water in the wood is removed and the bound water is gradually removed, so that the wood is transferred to the dry state.

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 cracking, etc., width warping, wave warping, warping such as heavy bending, and eliminating the possibility of irregular deformation, etc. Furthermore, it also prevents the growth of fungi such as mold. For the purpose, for example, the used wood has been dried and used up to the air-dry water content.

[0004] Such drying means include, for example, a method of drying after being dried with a log, and a method of making lumber, and then a method of drying after making a log into a square or plate material. As the former method of drying with a log, for example, a so-called wilting method of drying in the state of a standing tree and a so-called leaf wiping method of drying after cutting are generally used. ,
In both cases, the drying process takes several months,
Moreover, there is a certain limit to the degree of drying, such as the degree of drying not being less than the air-drying water content, and there is a possibility of being damaged by insects. There wasn't.

From that point, log wood cut from
After sawing into saws and saws, these boards, saws,
It is generally used to naturally or forcedly dry sawn timber and the like to reduce the water content contained in wood to a predetermined value or less. In drying such ground lumber, for example, the so-called lumber is left to stand in the atmosphere, the water contained in the lumber is naturally evaporated and dried,
The method of air drying and the drying of these lumber, etc. under special drying conditions, for example, in a drying chamber where it is heated by steam and an appropriate amount of steam is sent, while adjusting the temperature and humidity. The so-called steam method, further, for example, the so-called hot air method, further the smoke method, the boiling method in which heated air is fed into the drying chamber or the air in the drying chamber is dried to dry the ground lumber and the like. Generally, a so-called artificial drying method for drying ground beetles and the like by various forced drying methods such as a vacuum method and a vacuum method, and a drying method in which this artificial drying is combined with the above-mentioned atmospheric drying are generally used. .

[0006] In this type of drying method, for example, drying of ground lumber by air drying has the advantages that the drying cost is low and there are few cracks associated with drying,
It takes a lot of days to dry, but it is difficult to dry the heart of the wood, and the difference in water content between the sapwood and the heartwood is large even after drying. It also has the disadvantage of requiring a large space for the drying process. On the other hand, in the so-called artificial drying method that uses forced drying means, such as sawn timber,
The number of days required for drying may be small, and further, it is possible to relatively dry the heart of the wood, and on the other hand, there is an advantage that there is relatively no difference in the water content between the sapwood and the heartwood in the dried wood, It has the drawbacks that cracks and irregularities tend to occur during drying, and the drying yield is low despite the high cost of the drying treatment. From that point,
Attempts have been made to eliminate the inconveniences associated with the respective drying means by using both the means for drying the population and the means for drying the atmosphere, but both have advantages and disadvantages. There was nothing satisfactory as a drying means.

[0007]

From this point of view, a relatively deep serration is usually formed on the back side of the wood so as to extend in the original direction. A so-called splitting means is used to prevent cracking of the wood and to prevent bending and warping that occur with drying of wood. In the drying method including the means for splitting the spine, it is possible to dry the wood in a relatively short period of time, and it is possible to relatively dry the core part. It has the feature that there is little difference in the water content between the two, and it also has the feature that it cracks relatively less.

However, when the wood is dried by this kind of back splitting method, the back splitting portion often opens as a result of the drying process.
When the back split 1a is applied and dried as shown in FIG. 13, the portion of the back split 1a spreads with drying, and the dried timber deformed at the back split 1a was used as, for example, a pillar material 1'of the large wall construction method. In this case, there is an inconvenience that the flatness of the constructed wall surface of the cloth is impaired by the warped surfaces 1b and 1c of the column member 1'when the column member 1'is opened toward both sides. Also, the back splitting pillar material 1'used as the pillar material 1'for the large wall construction method as described above.
In many cases, the opening width of the back split 1a changes in accordance with the water content of the column member 1 ', and the behavior of the back split 1a causes cracks in the staking cloth, flickering of the wall, etc. There was an inconvenience. In addition, similarly, there is a problem that the media portion is cut out in the stake-in tile wall.

From that point, the sawn timber 1 with the spine split 1a has the warped surfaces 1b and 1c which are deformed by drying,
By correcting again with the lines xx and yy in FIG. 13, the respective planes are made orthogonal to each other, and the corrected lumber 1 is used as the pillar 1 ′ as shown in FIG. Is being attempted. When a wall surface is formed by applying a cloth or the like to the surface of the pillar material 1'by such a method, the formed wall surface has a flat surface at the beginning of its construction.
As shown in FIG. 17, the split width of the spine split 1a changes in the expanding direction or the closing direction according to the change in the water content, so that the surface of the decorative material 2 such as the cloth that is stretched is flickered. However, there are inconveniences such as the occurrence of 2a and the edge 2b at the joint edge of the upholstery decorative material 2.

In view of the inconvenience in the drying method of such conventional wood, especially the timber with heart-supporting timber, the present invention allows the heartwood portion to be dried in a relatively short period of time, and the degree of drying between the heartwood and the sapwood portion. It is an object of the present invention to provide a drying method which is made substantially uniform and prevents cracks on the surface of the square bar due to the drying process as much as possible.

[0011]

SUMMARY OF THE INVENTION The present invention achieves the above object. According to the invention of claim 1, all or a part of the surfaces 10e to 10e excluding the wood mouth surface 10d of the support square member 10e. In addition, a plurality of flaws 11a having a depth of 10 mm or more and less than 30 mm are provided in whole or in part, and the supporting square member 10 provided with the flaws 11a is dried by an appropriate drying means.

Next, in the invention of claim 2, the flaw 11a provided in the cored square 10 is provided with a core 10a and a sap 10
When the cored timber 10 having b is dried, the whole or a part of the cored timber 10 from the side material 10b side toward the core material 10a side, and the side material 10b and the core material 10a.
It is provided so as to reach the core material 10a side beyond the transition material 10c between the core material and the core material square material 10 having the flaw 11a, and a drying process is performed by an appropriate drying means.

Next, according to the third aspect of the present invention, the surface of the support square member 10 in the direction orthogonal to the direction of the medullary center 10f, that is, the surface excluding the respective wood mouth surfaces 10d called the end opening and the main opening, that is, the support Face 10 in the tangential direction of annual ring 10g of square timber 10
e, 10e, 10e, all or part of the surface 10e of 10e
1 excluding both sides 10e 'and 10e' in the width direction of the
0e ″ is provided with a flaw 11a having a depth of 10 mm or more and less than 30 mm in whole or in part, and the cored square member 10 provided with the flaw 11a is subjected to a drying treatment by an appropriate drying means.

Further, in the invention of claim 4, the holding square member 10 is provided.
The cut 11 'is the flaw 11 provided in the cut 11'.
Is the fiber direction of the holding square timber 10, that is,
The holding square bar 10 toward the so-called axial center line direction which is the original direction.
The surfaces 10e to 10e other than the wood mouth surfaces 10d and 10d are provided with respect to the centering timber 10 having the cut 11 '.
It is configured to perform a drying process by an appropriate drying means.

Further, the invention of claim 5 is,
The flaw 11 provided at 0 is designated as a puncture wound 11 ″, and this puncture wound 1
1 "is provided to the supporting square member 10 and the drying process is performed by an appropriate drying unit.

In the present invention, the sapwood 10b is mainly composed of living soft cells in the uncut wood,
The portion of the heartwood 10a that contains a storage substance such as starch as an energy source for growth is the heart cells 10a, and the living parenchyma mainly living inside the sapwood is dead and the storage substance is converted into the heartwood substance. The transition material 10c means a portion on the boundary between the core material 10a and the sap material 10b, in which mainly living cells are dying.

Further, in the present invention, the surface 10e excluding the wood mouth surfaces 10d and 10d of the holding square timber 10 is a surface cut in the tangential direction of the annual ring 10g of the holding square timber 10, that is, the medullary core 1
It means a surface which is parallel to 0f and which is usually called a grain. Further, in the present invention, the width direction of the surface 10e means a direction orthogonal to this length direction, with the direction of the unsupported and original mouths of the holding square bar 10 as the length direction. Furthermore, in the present invention, the flaw means all aspects in which a part of the tissue of the supporting square member 10 is damaged from the surface 10e of the supporting square member 10 toward the inside of the supporting square member 10.

[0018]

The cored square member 10 is provided with a flaw 11 on its surface excluding the wood mouth surfaces 10d and 10d.
Since all or part of 1 is the flaw 11a having a depth of 10 mm or more and less than 30 mm, the drying of all the parts of the cored square 10 including the core 10a part is promoted in a relatively short period of time.

Since the flaws 11 provided on the support square 10 are mainly the flaws 11a having a depth of 10 mm or more and less than 30 m, the flaw 11a portion does not open like a back splitting member, and therefore There is no deformation of the supporting square member 10 due to the opening of the flaw 11a.

Since the flaw 11 provided on the cored square member 10 is provided so as to pass through the transition material 10c from the sapwood 10b to reach the core material 10a, the core material 10a portion is uniformly and up to a predetermined water content in a short period of time. To be dried.

[0021]

EXAMPLES Each example of a typical drying method according to the present invention will be described in detail below. FIG. 1 is a perspective view of a holding square member 10 according to the first embodiment, FIG. 2 is a front view of the holding square member 10, and FIG. 3 is a plan view of the holding square member 10. Moreover, FIG. 4 shows the holding square bar 10 according to the second embodiment as viewed from the front. Then in FIG.
FIG. 2 is a view of a state of a drying experiment of the supporting timber 10 which is seen from above, in which each experimental material is placed on a cradle, and the first to eighth groups are attached.
The figure shows a state in which they are arranged in groups. FIG. 6 shows a typical means for forming a flaw on a supporting timber, and FIGS.
The shapes of various blades provided in this means are shown. Further, FIG. 10 shows another means for forming a flaw on the support square. Further, FIG. 11 explains the portion for measuring the water content of the supporting timber square in an easily understandable manner.

The core square 10 to be dried is
Softwood materials such as Sugi, Akamatsu, Karamatsu, Ezomatsu, Todomatsu, Kuromamatsu, Hinoki, Hiba, Tsutsumi, fir, and straw, but also hardwood materials such as Taro, Keyaki, Sakura, and Maple May be The heart-shaped timber 10 has tree mouths 10d and 10d that are cut at the end opening and the base opening, and an annual ring 10g appears in a ring shape in the wood opening 10d, and a medullary center 10f is approximately at the center thereof. There is a core material 10a portion 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 hearted timber 10
Are the surfaces 10e, 10 which are tangential to the annual ring 10g.
e, 10e, 10e, which are cut in a direction orthogonal to the axial centerline so that the surface (the surface corresponding to the wood mouth surface) has a substantially quadrangular shape, and is on the circumferential side of the holding square bar 10. The surface 10e has a configuration in which the surfaces 10e and 10e adjacent to each other intersect at a right angle.

Defects 11 are provided on the supporting square member 10. The flaw 11 provided on the supporting square member 10 may be a relatively short cut-like flaw 11 'as shown in FIGS. Moreover, as shown in FIG.
1 ". Further, the flaw 11 is the flaw 1 described above.
It may be provided intermittently as in 1 ′ and 11 ″, or may be provided in a continuous manner, that is, in a line shape on the surface 10e of the supporting timber 10 so as to extend between the wood openings.

This is a flaw 11 provided on the supporting square member 10.
It is preferable that the flaw 11 includes a large number of flaws 11a whose depth is deeper than 10 mm and shallower than 30 mm,
More typically, all the flaws 1 provided on the supporting timber 10
1 is a defect with a depth of 10 mm or more and less than 30 mm 1
It may be provided on the supporting square member 10 as 1a.

Further, from the point that more flaws 11 are provided on the surface of the support square 10, the flaw 11b having a relatively shallow depth, for example, a depth of less than 10 mm and the flaw 11a having a depth of 10 mm or more.
And may be provided adjacent to each other. When the shallow flaw 11b and the relatively deep flaw 11a are provided adjacent to each other, the number of flaws 11 per unit area is substantially the same as that of the cored square 10 having only the same number of deep flaws 11a. It is possible to bring the dry state of the above into the cored square bar 10 provided with the flaw 11 including the shallow flaw 11b. Further, by providing the relatively shallow flaws 11b in the adjacent portions of the deep flaws 11a as described above, even when the number of the flaws 11 per unit area of the support square 10 is increased, the deep flaws 11a are mutually adjacent. When the deep flaws 11a are formed next to each other without being continuous with each other, the flaw forming means removes the meat portion of the surface of the supporting timber between the formed flaws, There is no concave defect on the surface of the supporting timber.

The wood corners 10d and 10d of the timber 10
The flaw 11 provided on the surface 10e except for the processing board 2 is, for example,
Forming a flaw that moves up and down like a press having a plurality of piercing pieces 22 that are inserted into the surface of the holding square bar 10 on the side contacting the holding square bar 10 with respect to the holding square bar 10 placed on Means 21 are provided, and a plurality of flaws 11 are provided on the surface 10e of the supporting square member 10 by the flaw forming means 21. In this case, the piercing piece 22 provided on the flaw forming means 21 is
For example, as shown in FIG. 7, a stick-like piercing piece 2 having a sharp tip like a nail.
2a, or a plate-shaped piercing piece 22b having a predetermined blade length as shown in FIGS. 8 and 9. 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, and the blade length in the flaw forming means 21. It may be provided so as to cover the entire width of the surface in contact with the holding square member 10 (not shown). Further, the piercing piece 22b having the predetermined blade length may project, for example, in an arc shape at the central portion in the blade length direction as shown in FIG. 7, or as a mountain shape as shown in FIG. Is also good. Further, these various piercing pieces 22 may be provided in the same flaw forming means 21 in a mixed manner.

The piercing piece 2 provided on the flaw forming means 21.
2 has a protrusion size corresponding to the depth of the flaw 11 formed on the surface 10e of the support square member 10 to be processed. For example, a piercing piece 22 ″ having a protrusion size of about 5 mm to 15 mm and 15 mm A piercing piece 22 'having a protruding dimension of about -40 mm is prepared, and a flaw 11b having a depth of less than 10 mm is formed by using the piercing piece 22 "having a protruding dimension of about 5 mm to 15 mm. Hearted timber 10
Is formed on the surface 10e. Further, the flaw 11a having a relatively deep depth, for example, 10 mm or more and less than 30 mm is formed by using the piercing piece 22 'having a protrusion size of about 15 mm to 40 mm.

Further, the fine rod-shaped piercing piece 22a is used to form a flaw 11 "as a hole-like puncture wound on the supporting square member 10.
To provide. Further, by the plate-shaped piercing piece 22b,
A cut-like flaw 11 ′ is provided on the support square 10. The flaw 11 provided on the supporting timber 10 is a surface excluding the opening 10d of the supporting timber 10, that is, an annual ring 10g of the supporting timber 10.
Is provided on all of the peripheral surfaces 10e, 10e, 10e, 10e, 10e of the holding square bar 10 which are the surfaces in the tangential direction, or on any one or more of these surfaces 10e-10e. I wish I had it.

Further, the flaw 11 may be provided over the entire surface 10e of the supporting square member 10, or the flaw 11 may be provided only on a part of the surface 10e. In this case, both side portions 1 in the width direction of the surface 10e
The flaw 11 may be provided only on the surface 10e ″ excluding 0e ′ and 10e ′. Thus, the flaw 11 is not provided on both side portions 10e ′ in the width direction of the surface 10e, and the flaw 11 is provided only on the surface 10e ″.
It is possible to avoid the inconvenience associated with the provision of the flaws 11 at the corners of the supporting square member 10, for example, the deterioration of the strength of the supporting square member 10 as a structural member. Further, even when the flaw 11 is provided only on the central portion of the supporting square bar 10, the flaw 11 causes the supporting square 1 to move.
Since it is provided in the approximate center of 0,
Most of the core squares 10 are provided so as to reach the side of the core square 10a of the core square 10, and the core square 10 is subjected to substantially the same drying as in the case where the flaws 11 are formed on the entire surfaces 10e of the core square 10. It has the features to bring.

Next, a flaw 11 provided on the supporting square member 10
Is not a fine puncture wound but has a certain length, the flaw 11 is directed to the direction of the wood fiber of the support square 10, that is, the flaw 1
It is preferable that the direction of No. 1 is aligned with the direction of the wood mouths 10d, 10d of the bearing square timber 10, and the flaws 11 are oriented in the direction of the wood fibers of the bearing square lumber 10 as described above. For example, it is possible to avoid deterioration of the strength of the holding square bar 10 as a structural material.

When the surface 10e is the sapwood 10b, the flaw 11 provided on the surface 10e of the above-mentioned supporting core square 10 reaches the core material 10a from the surface of the sapwood 10b beyond the transition material 10c. It is preferable to be provided as follows. As described above, since the flaw 11 provided on the surface 10e of the core supporting square 10 is provided so as to reach the core 10a beyond the transition material 10c portion of the core supporting square 10, It has the characteristic that drying is more uniform and promoted.

Further, a flaw 11 provided on the supporting square member 10
By increasing the depth of this flaw 11,
It is possible to further promote the drying of the core material 10a portion of the core material 10 but the effect of promoting dryness due to the provision of a deep flaw of 30 mm or more from the surface 10e of the core material 10 tends to gradually decrease. , Deep scratches 11 with square timber 1
Considering the inconvenience associated with the provision of No. 0, for example, the deterioration of the strength as the structural material, the depth of the flaw 11 provided in the supporting square member 10 is preferably less than 30 mm. Also,
Such deep scratches, especially flaws of 30 mm or more
If it is provided on each surface, the size of the apparatus becomes large, and the equipment cost of the processing equipment and the running cost are high. On the other hand, 10 mm with respect to the supporting square member 10
If only the shallower flaws are provided and dried, it takes a relatively long time to dry the heart timber 10 and the heart timber,
There is an inconvenience that the medullary portion is not dried sufficiently.

As yet another example of the flaw treatment for the supporting square member 10, for example, FIG. 10 shows a rotating flaw forming means 30. The supporting square member 10 for the rotating flaw forming means 30 is shown in FIG. Even if the flaw 11 is provided on the surface 10e of the cored square 10 while moving the same, or the flaw 11 may be provided on the surface 10e of the cored square 10 while moving the rotating flaw forming means 30 with respect to the fixed cored square 10. good.

The flaw forming means 30 has a piercing piece 22 having a structure similar to that of the flaw forming means 21 in a protruding state on the peripheral surface of the flaw forming means 30 which is a roll-shaped rotating body. Then, the supporting square member 10 is pressed against the pressure contact roll 31, and the surface 10e of the supporting square member 10 is provided with the same flaw 11 as in the flaw forming means 21.

The direction of the piercing piece 22 provided on the roll-shaped flaw forming means 30 is arranged such that the blade length thereof is aligned in the circumferential direction of the roll-shaped flaw forming means 30, and
By setting the moving direction of the flaw forming means 30 or the holding square bar 10 to be the longitudinal direction of the holding square bar 10, each flaw 11 can be provided in the direction of the wood fiber of the holding square bar 10. Further, the piercing piece 22 provided on the roll-shaped flaw forming means 30 is configured such that the direction of the blade length thereof is aligned with the axial direction of the roll-shaped flaw forming means 30, and the flaw forming means 30 or By setting the moving direction of the holding square members 10 to be the width direction of the holding square members 10, the flaws 11 can be provided in the respective directions of the wood fibers of the holding square members 10.

The piercing piece 22 assembled to the flaw forming means 30 may have any structure of the piercing piece 22 assembled to the flaw forming means 21. The protrusion size of the protruding piece 22 is also the flaw forming means 21.
Similar to the piercing piece 22 provided on the
What corresponds to the depth of the flaw 11 provided on the surface 10e of the is used.

Further, the flaw 11 provided on the holding square bar 10 by each of the above means 21 and 30 is such that the piercing piece 22 is pierced into the holding square bar 10 and then the piercing piece 22 is pulled out. After the wood fibers 10 and the like of 10 are once spread, the flaw portion is closed by the piercing piece 22, and the flaw 11 has a relatively narrow flaw width. Like this, defect 1
By setting 1 as a flaw having a narrow flaw width, it is possible to eliminate the disturbance on each surface 10e of the support square member 10, in particular, the warp of the flaw edge caused by the extension of the flaw 11 portion, and the flaw possessed by the flaw 11 The function of accelerating the drying of the timber 10 is not impaired. Alternatively, the flaw 11 formed on the surface 10e of the support square 10 may have a wide flaw width, and the surface 10e may be provided with a concave or groove-shaped flaw 11.
(Not shown)

[0038] A supporting timber 1 having the flaws 11 as described above
Dry 0. As a means for drying the supporting timber 10,
All the drying means used for drying this type of supporting square bar 10 can be used. For example, the cored square bar 10 provided with the above-mentioned flaw may be left in the atmosphere and the water content thereof may be naturally evaporated and dried, and various types such as a steam method, a hot air method, a smoke method, a boiling method, and a vacuum method may be used. Method, high-frequency method or any other drying means may be used for forced drying. And in any of these cases, the water contained in the supporting timber 10 is dissipated to the outside in a short time by the flaws provided in the supporting timber 10, especially the flaw 11a having a depth of 10 mm or more. Particularly, the drying of the core material and the medullary core portion of the heart-supporting timber 10 is particularly promoted, and the heart-supporting timber 10 is sufficiently dried. And, a flaw 1 provided in the holding square member 10 for the purpose of promoting the drying of the holding square member 10.
Since 1 has a depth of at least less than 30 mm, even if the cored square 10 is dried by any drying means, the flaw provided in the cored square 10 does not open, and the cored square 10 does not open. Even when used as a pillar material for a large wall construction method, there is no occurrence of flickering or edge cutting on the cross surface or the like.

<Drying comparison experiment example> Eight cedar heart-supporting timbers each having a square cross section of 115 mm on a side were prepared, and each of the heart-bearing timbers was cut into 600 mm pieces, and four of each of the heart-bearing timbers were cut. The test material of was obtained. The test material obtained here is
A group is constructed for each test material obtained from a single cedar wood, and in the test materials in each group, the front side of the cedar wood is on the left side of Fig. 5, and the end side is on the right side. Each test material was arranged so that it might be located.

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

The test material referred to as the test material A is: (1) A part of the surface (all four surfaces) excluding the wood mouth, which is approximately 40 mm to 75 mm wide in the center excluding both side parts in the width direction (width direction of the surface). Width of 40 mm to 75 mm), and has a flaw with a depth of about 20 mm and a flaw with a depth of about 10 mm over the entire length in the length direction of the test material. (2) Each flaw is The flaws are provided in a cut shape by aligning the length side of the flaw in the length direction of the surface, and the flaws arranged in the width direction are alternately the flaws having the depth of about 20 mm and the flaws having the depth of about 10 mm. Defects that are provided and are adjacent to each other in the length direction of the test material are not on the same line with each other, (3) Furthermore,
This defect has a depth of about 20 mm and a length of about 15 mm to 25 mm.
It has a depth of about 10 mm and a length of about 10 mm to 20 mm.
There are approximately 30 flaws in a 115 mm × 115 mm surface of the flaw-provided surface.

The test material called the test material B is: (1) over substantially the entire surface of each surface (all four surfaces) excluding the wood mouth,
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, and the length side of the flaw is aligned in the length direction of the test material to form a cut shape. (3) There are 50 flaws on the surface of 115 mm × 115 mm provided on each surface.

The test material indicated as the test material C is: (1) A back split is provided in the lengthwise direction at approximately the center of one surface of the test material so as to extend from the wood to the wood. )
This back split is one kerf, the depth is about 63 mm, and the groove width is about 3 mm.

The test material called test material D is the same as the test material prepared above, that is, the cedar material is simply 6
The one that has been cut to 00 mm is used.

Each of the test materials thus prepared and arranged in the arrangement as shown in FIG. 5 corresponds to each test material, for example, one cedar material to test material A, test material B, test material. C,
Make a test material D and make a group by each cedar material,
While forming 8 groups of the 1st group-8th group, each test material A, the test material B, the test material C, and the test material D is the front mouth side of each group, the front mouth side, the non-mouth side. ,
They were arranged in the state of FIG. 5 so that they were evenly present on the unmouthed side.

Each test material of each group thus prepared was dried using a low temperature dehumidifying dryer. The conditions for drying with this low temperature dehumidifying dryer are as shown in Table 1,
The drying treatment under these conditions was completed in a total of 14 days, and the respective dried test materials were taken out from the dryer, and the degree of drying and cracks in each test material were examined.

[0047]

[Table 1]

Tables 2 to 5 show changes in water content of the test material A, the test material B, the test material C and the test material D, which were appropriately distributed to the respective groups and dried. The water content of the whole test material before and the water content of the whole test material after the drying treatment were measured respectively, and the difference between the water content before drying and the water content after drying is shown and the average of these is rounded off. .
Further, the length of cracks and the width of cracks formed on the surface of each test material were measured, respectively, and after summing these, the average of these is rounded off.

[0049]

[Table 2]

[0050]

[Table 3]

[0051]

[Table 4]

[0052]

[Table 5]

Test material A had a larger difference between the water content before drying and the water content after drying than any of test material B, test material C, and test material D, and was generated on the surface of test material A. The length of the crack,
It was confirmed that the total amount of the crack width was significantly smaller than that of the test materials B and D.

The sapwood part of each of the test material A, test material B, test material C, and test material D contained in each of the groups (first to eighth groups) obtained by the above-mentioned drying. The water content in the heartwood portion and the water content in the core portion were measured, and the average of the water content in the sapwood portion, heartwood portion, and core portion of each test material was compared. First, each dry-processed test material obtained by the above method is divided into 25 equal parts on the mouth side so that each of them is a square having the same area, and each test material is divided in the longitudinal direction according to this dividing line. By doing so, each section has 25 square measurement sections a, a, u ..., Nu, Ne, No.
The water content of each of the measurement categories a, a, u, ..., n, ne, and no is measured, and then, a, i, u, d, o, co, so, to, no,
The water content of the 16 measurement sections of Ne, Nu, Ni, Na, Ta, Sa, and Ka is averaged to obtain the water content of the sapwood portion. further,
The water content of the eight measurement sections, i.e., k, k, se, te, tsu, chi and shi, is averaged to obtain the water content of the core material. Then, the water content of each measurement section was set as the water content of the medullary portion, and the water content of each section was measured. Tables 6 to 9 show the respective water contents in the sapwood, heartwood, and core of each test material measured here, and the average water contents are rounded off.

[0055]

[Table 6]

[0056]

[Table 7]

[0057]

[Table 8]

[0058]

[Table 9]

When the water contents after drying of these test materials were compared, the test material A was relatively efficiently dried in the sapwood part, the heartwood part, and the medullary core part as compared with the other test materials. In particular, it was confirmed that the drying at the medullary portion and the heart material portion was remarkably accelerated as compared with the test materials B and D.

The water content before drying and the water content after drying of each of the test materials after the drying treatment obtained above were measured at the sapwood portion, heartwood portion, and medullary portion of each test material, This difference in water content was investigated. Also in this case, similarly to the above, each of the above-mentioned test materials is divided into 25 equal parts on the mouth end surface so that each of them becomes a square having the same area as shown in FIG. The water content of each of the categories a, a, u ... nu, ne, and no was measured, and the measured measurement categories a, a, u ...
Among Nu, Ne, and No, measurement categories a, i, u, d, o, ko,
The average of the water content of the 16 compartments of So, To, No, Ne, Nu, Nu, Ni, Na, Ta, Sa and Ka is taken as the water content of the sapwood before drying. In addition, the measurement categories K, K, K, C, TE, T, J,
The average of the water content of the eight compartments of S and C is taken as the water content of the core material before drying, and the water content of the compartment of the measurement section S is taken as the water content of the medullary portion before drying. Furthermore, in the same way,
The water content of each of the measurement categories a, a, u ... nu, ne, and no after drying in each of the above-described categories in each test material was measured, and the measurement categories a, a, u, and d were measured in the same manner as above. Oh,
The average water content of the measurement categories of Ko, So, To, No, Ne, Nu, Ni, Na, Ta, Sa, and Ka is taken as the moisture content of the sapwood after drying. , Se, Te, Tsu, Chi,
The average of the water content of the measurement sections of S and S is taken as the water content of the core material after drying, and the water content of the section of the measurement section S is taken as the water content of the core portion after drying. From the water content of each measurement section before drying measured in this way, subtract the water content of each corresponding measurement section, and examine the difference in water content between the sapwood, heartwood, and medullary core. , Table 10 to Table 13
It was shown to. (Note that Δ in the table indicates that the water content after drying is higher than the water content before drying.)

[0061]

[Table 10]

[0062]

[Table 11]

[0063]

[Table 12]

[0064]

[Table 13]

The difference in water content between each of the measured test materials before drying and each test material after drying was compared for each of the sapwood portion, heartwood portion, and pith core portion of each test material. A is
Compared to the other test materials B, C, and D, the sapwood, heartwood, and medullary core show high numerical values, and the degree of drying is greater than that of the other test materials. Was confirmed. In particular, the difference between the water content before drying and the water content after drying in the core of Test Material A was extremely high at 43.5 (wt%), and the promotion of drying in the core was particularly high in Test Material A. It is recognized that the occurrence is remarkable.

[0066]

EFFECT OF THE INVENTION The method for drying a timber with square timber according to the present invention is characterized by the above-mentioned constitution, and in particular, a large number of flaws including flaws of 15 mm or more and less than 30 mm are provided on the surface excluding the wood surface of the timber with timber. As a result, there is no inconvenience that the split part opens or warps like the case of the back split material, and the split part opens or closes as the material dries and wets. There is no inconvenience associated with directional behaviour.

Further, in the drying treatment, it exhibits a drying characteristic similar to that of a back splitting material, and particularly when evaluated from the removal rate of water contained in wood, in the method for drying a timber with timber according to the present invention, It has the feature that it is possible to remove more water than the back splitting material, and that water can be removed efficiently even in the core material and the medullary core.

Furthermore, the number of cracks generated by the drying process is small, the crack length and crack width per piece are small, and the characteristics that the cracks due to drying do not impair the characteristics of the holding square bar at all. ing.

[Brief description of drawings]

FIG. 1 is a perspective view of a holding timber according to an embodiment of the present invention.

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

FIG. 3 is a plan view of the same.

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

FIG. 5 is a plan view showing an arrangement state of each test material during drying, showing an experimental example of a supporting square bar.

FIG. 6 is a block diagram showing a typical means for making a flaw on a supporting timber.

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 means for making a flaw on the supporting timber.

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

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

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

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

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

FIG. 16 is a configuration diagram showing a usage state of a back splitting material in which a distortion portion is corrected.

FIG. 17 is a configuration diagram showing a state where the back splitting material in which the distortion portion is corrected is opened at the back splitting portion with use.

[Explanation of symbols]

 10 Spontaneous square bar 11 Defect 20 Processing board 21 Defect forming means 22 Blade 30 Defect forming means 31 Pressure welding roll

Claims (5)

[Claims] 1. A plurality of flaws each having a depth of 10 mm or more and less than 30 mm are provided on all or a part of the surfaces of the supporting timber except for the mouth end surface, and the flaws are provided. A method for drying a heart timber, wherein the timber timber is dried. 2. A center square timber having a core material and a sapwood,
A plurality of flaws are provided in which all or a part of the cored squares from the side of the sapwood toward the side of the core is over the transition material between the sapwood and the core to reach the side of the core. The method for drying a supporting timber according to claim 1, wherein 3. A plurality of flaws are provided on any one or more of the faces in the tangential direction of the annual rings of the centering timber, excluding both sides in the width direction of the faces. The method for drying a holding timber according to claim 1, characterized in that: 4. A method for drying a cored timber according to claim 1, wherein the flaw provided on the timbered square is a cut, and the cut is provided in the fiber direction of the timber. 5. The method for drying a holding timber according to claim 1, wherein the flaw provided on the holding timber is a puncture wound.