JP2002338978A - Wood material for combustion and process for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wood material for combustion that is easily combustible and to provide a process for producing the wood material. SOLUTION: In the wood material 1 for combustion, a pair of grooves 7, 8 for aiding combustion are formed on respective cutting surfaces 6A, 6B of a log 2 such that one pair of grooves on one cutting surface alternates with the other pair of grooves on the other cutting surface when viewed from above or below the respective cutting surfaces in the vertical direction. Spaces 9, 10 positioned in respective intersections of the grooves 7, 8 for aiding combustion are penetrated all the way from one space to the other to form a through- hole 11 through a heartwood portion 3 of the log 2 along the axis thereof. A corner portion on the axial side of each portion divided by the grooves 7, 8 for aiding combustion is sharply edged to form a corner portion 13 for ignition. Grooves 12A, 12B for inducing air are formed on the sides of the respective cutting surfaces 6A, 6B such that the grooves 12A, 12B extend inwardly to respective opening portions of the grooves 7, 8 and the width of the grooves 12A, 12B is gradually enlarged in a tapered manner so as to be larger than the width of the grooves 7, 8 for aiding combustion. By virtue of this construction of the wood material for combustion, ignition can be easily effected to the heartwood portion 3 in a dry state and combustion can be efficiently effected because a sapwood portion 4 gradually gets dried by combustion heat of the heartwood portion 3. Additionally, air can be smoothly supplied to the through-hole 11 and the thickness of each portion divided by the grooves 7, 8 for aiding combustion is reduced, whereby the combustion efficiency can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood material for combustion and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, in outdoor activities such as camping, wood materials such as firewood have been used as burning materials for performing bonfires, cooking, and the like.

[0003] Such a woody material contains a large amount of moisture in a state close to a living tree and is difficult to burn, so it needs to be dried in advance. As such a drying means, for example, there is leaf wiping in which a cut tree trunk is laid in a forest with ears attached, and drying is performed by transpiration from leaves. Also, there is a log drying method in which a ball cut into logs is dried in a soil field or the like.

[0004]

However, in the above-mentioned method, it takes a long time of about 160 days to dry the woody material to such an extent that it can be easily burned, that is, to a water content of about 40%. It was not efficient.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wood material for combustion which can be easily burned and a method for producing the same.

[0006]

According to the first aspect of the present invention, there is provided a fuel wood material which is obtained by processing a log cut to a predetermined length. A through-hole axially penetrating the core part of the log;
An ignition corner protruding into the through hole is provided.

According to a second aspect of the present invention, there is provided the wood material for combustion according to the first aspect, wherein a combustion assisting groove connected to the through hole is provided in the cut surface of the log. .

According to a third aspect of the present invention, there is provided the wood material for combustion according to the second aspect, wherein the combustion-assisting groove has a shaft on one cut surface side and the other cut surface side in the axial direction of the log. It is characterized by being staggered when viewed from the direction.

According to a fourth aspect of the present invention, there is provided the wood material for combustion according to the second or third aspect, wherein the cut surface includes:
An air guide groove connected to the opening of the combustion assisting groove and having a width larger than that of the combustion assisting groove is formed.

According to a fifth aspect of the present invention, there is provided the wood material for combustion according to any one of the first to fourth aspects, wherein a carrying recess is provided in the outer peripheral surface of the log. Features.

According to a sixth aspect of the present invention, there is provided a method for manufacturing a wood material for combustion, comprising a pair of first cross sections which intersect one cut surface of a log cut to a predetermined length at a core material position of the log. A combustion-assisting groove is formed at a predetermined depth, and a pair of second combustion-assisting grooves that reach the bottom surface of the first combustion-assisting groove and intersect at the core portion of the log are formed on the other cut surface of the log. When viewed from the cutting surface direction, the first combustion assisting groove is alternately formed, and is formed so as to coaxially intersect with a position where the pair of first combustion assisting grooves intersect.

[0012]

According to the first aspect of the present invention, the wood material for combustion has a through-hole axially penetrating the core portion of the log, and an ignition projecting into the through-hole. Corners are provided.

Generally, in a log in a state close to a raw tree immediately after logging, the sapwood portion has a very high water content of 100% to 200%, and is in a state where it is difficult to burn. This is because the sapwood portion is composed of a water conduction path and living cells that store nutrients. On the other hand, the heartwood portion is composed of cells that have stopped and have withered, and therefore have a low water content of 30% to 60%, and are in a dry state that can be easily burned.

Therefore, if the seed material is directly ignited by injecting a pilot flame from the hole provided in the core material portion of the log, even a log that has not been subjected to a drying step can be easily ignited. At this time, by forming the hole portion as a through hole penetrating in the axial direction of the log, air for continuing combustion is easily supplied to the core material portion. In addition, the sapwood portion is gradually dried by the heat of combustion of the core material portion, and has a water content such that it can be easily burned. Along with this, the flame gradually spreads to the sapwood part, and the combustion is continued. Therefore, even if the log is not subjected to a long-term drying step in advance, combustion can be efficiently performed.

Further, since the log can be efficiently burned immediately after ignition, it can be used as illumination for illuminating the surrounding area with a flame, and a wood material suitable for outdoor use can be obtained. .

Further, if the inner wall surface of the through hole is smooth,
Since there is no part that triggers ignition, it may take time from the start of the pilot flame to the ignition. Therefore, by providing a sharp corner in the through hole and setting the corner as an ignition point, the wood material for combustion can be ignited in a short time.

According to the second aspect of the present invention, a combustion assisting groove connected to the through hole is provided in the cut surface of the log. According to such a configuration, since air is supplied from the outside into the through-hole through the combustion assisting groove, the combustion can be performed smoothly. Also, the burning rate (carbonization rate) of woody materials
Is affected by the thickness of the wood material, for example, a thickness of 25 m
m, the carbonization rate is 0.83 mm / min, while the thickness 50 mm is 0.63 mm / min,
As the thickness increases, the carbonization rate decreases. However, by providing the combustion assist groove, the thickness of each portion divided by the combustion assist groove is reduced, and the combustion efficiency can be increased.

According to the third aspect of the present invention, the combustion assisting groove is
The log is provided so as to be staggered between one cut surface side and the other cut surface side in the axial direction. With such a configuration, it is possible to maintain the shape of the entire log while increasing combustion efficiency by forming a deep groove.

According to the fourth aspect of the present invention, the cut surface of the log is formed with the air guide groove which is continuous with the opening of the combustion assisting groove and which is wider than the combustion assisting groove. According to such a configuration, it is possible to make air flow into and out of the through-hole more smoothly, and it is possible to make combustion more efficient.

According to the invention of claim 5, the log is provided with a concave portion for carrying on the outer peripheral surface. For this reason, carrying can be easily performed by putting a finger on the carrying recess.

According to the invention of claim 6, first, a pair of first combustion assisting grooves intersecting at a core material portion of the log at a predetermined depth are formed on one cut surface of the log cut to a predetermined length. Then, a pair of second combustion assisting grooves reaching the bottom surface of the first combustion assisting groove are formed on the other cut surface of the log. At this time, the second combustion assisting groove is alternated with the first combustion assisting groove when viewed from the cutting surface direction, and the pair of first combustion assisting grooves
The combustion assist grooves are formed so as to intersect coaxially with the intersecting position.

With this configuration, the spaces formed at the intersections of the two combustion assisting grooves are connected to each other and penetrate in the axial direction of the log, so that the penetrating portions can be used as through holes. Since a pair of both combustion assisting grooves is formed, a corner is formed on the axial center side of a portion of the log divided by the both combustion assisting grooves.
For this reason, this corner can be used as an ignition corner. In this way, since the combustion assisting groove is formed in the log and the through-hole and the corner for ignition can be formed at the same time, the woody material for combustion that can efficiently burn can be easily produced.

[0023]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a wood material for combustion according to an embodiment of the present invention; FIG.

As the log 2 used for the wood material 1 for combustion, for example, a thinned wood material such as cedar or cypress which is generated in a forest business can be used by cutting it to an appropriate length (see FIGS. 1 to 3). . In this log 2, a portion near the axis (inside of the chain line in FIGS. 1 and 3) is composed of cells in a stopped state and withered, and is in a dry state that can be easily burned. It is a core part 3. In addition, a portion close to the outer peripheral surface 5 (outside of a chain line in FIGS. 1 and 3) is a sapwood portion 4 which is constituted by living cells for storing water and nutrients and has a high water content. In the following description, the axial direction of the log 2 will be referred to as the vertical direction.

In this log 2, one cut surface 6A
A pair of first combustion assisting grooves 7A and 7B having a depth reaching a center position in the vertical direction (upper side in FIG. 1) is provided. The first combustion assisting grooves 7A and 7B are orthogonal to each other at the axis of the log 2 and have a cross-shaped cross section as a whole.

On the other hand, in the log 2, the other cut surface 6B
On the lower side in FIG. 1, a pair of second combustion assisting grooves 8A and 8B having a depth reaching the bottom surface of the first combustion assisting groove are provided. Like the first combustion assist groove, the second combustion assist grooves 8A and 8B are orthogonal to each other at the axial center position of the log 2 and have a cross-shaped cross section as a whole. The two combustion assisting grooves 7 and 8 each have a shape that divides the upper half and the lower half of the log 2 into four parts. However, since they are provided so as to be alternate when viewed from the cut surface 6 direction, the log 2 As a whole, the shape is maintained without being divided.

The space 9 at the intersection of the pair of first combustion assisting grooves 7A and 7B and the space 10 at the intersection of the pair of second combustion assisting grooves 8A and 8B are connected at the center in the vertical direction. The log 2 has a through hole 11 penetrating in the axial direction. In the log 2, the portions divided into four by the combustion assisting grooves 7 and 8 each have a fan-shaped cross section with the required side facing the direction of the through hole 11. The section 13 is provided.

The openings on the cut surfaces 6A, 6B side of both combustion assisting grooves 7, 8 are expanded in a tapered shape so that the air guiding grooves 12A,
12B.

A pair of cutouts having a size that allows insertion of one hand is formed on the outer peripheral surface 5 of the log 2 at a symmetric position slightly above the center position in the vertical direction. It has been.

When producing the wood material 1 for combustion,
For example, by using an electric saw or the like, first, one first combustion-assisting groove having a depth reaching the vertical center position of the log 2 is formed on one cut surface 6A of the log 2 cut to a predetermined length. 7A
To form notches. At this time, the first combustion assist groove 7
A is formed so as to pass through the axis of the log 2. Next, another first combustion-assisting groove 7B, which is orthogonal to the first combustion-assisting groove 7A at the axis, is similarly cut out.

Next, one second combustion assisting groove 8A is formed on the other cut surface 6B of the log 2. At this time, the second combustion assisting groove 8A is staggered from the first combustion assisting grooves 7A and 7B when viewed from the vertical direction (axial direction), and is coaxial with an intersection position where the pair of first combustion assisting grooves intersect. It is formed so as to intersect above. Further, the bottom surface 8C of the second combustion assist groove 8A
Reaches the bottom surface 7C of the first combustion assisting grooves 7A, 7B,
The space 9 at the intersection of the combustion assist grooves 7A and 7B communicates with the second combustion assist groove 8A. Next, another second combustion-assisting groove 8B, which is orthogonal to the second combustion-assisting groove 8A at the axis, is similarly cut out.

By doing so, the first combustion assisting groove 7A,
7B, the space 9 at the intersection of the second combustion assisting grooves 8A and 8B.
Is a through hole 11 penetrating through the log 2 in the axial direction. In addition, since both the combustion assisting grooves 7 and 8 are formed as a pair, a corner portion is formed on the axial center side of a portion of the log 2 divided by the combustion assisting grooves 7 and 8. Therefore, this corner can be used as the ignition corner 13. In this way, both the combustion assisting grooves 7 and 8 are cut out in the log 2 and the through holes 11 are simultaneously formed.
And the ignition corner 13 can be formed.

Thereafter, the cut surfaces 6 of the combustion assisting grooves 7, 8 are formed.
The edges on the sides A and 6B are chamfered to expand in a tapered shape, thereby forming the air guide grooves 12A and 12B. Finally, a pair of carrying recesses 14 are provided on the outer peripheral surface 5 of the log 2.
Are cut out to complete the wood material for combustion 1.

When burning the wood material 1 for burning, for example, a fire made of paper or the like is used as a pilot flame 15 and this seed flame 15 is inserted into the through hole 11 of the wood material 1 for combustion. (See FIG. 4A). At this time, the through hole 11 is formed at the axial center position, and the periphery thereof is the core material 3 which is in a dry state that can be easily burned, so that it is easily ignited. In addition, since the sharp ignition corner 13 is present in the through hole 11, the ignition corner 13
By setting the ignition point, ignition can be performed in a short time.

Thereafter, the combustion gradually proceeds from the vicinity of the through hole 11 of the log 2 toward the outer periphery (see FIG. 4B). At this time, the air required for combustion is supplied into the through hole 11 from the outer surface of the log 2 via the combustion assisting grooves 7 and 8 communicating with the through hole 11. In addition, an ascending airflow is generated in the through-hole 11 by the combustion heat after the ignition. And
The warmed air exits from above the through-hole 11 and the first combustion-assisting groove 7, and the air flows such that external cold air flows into the through-hole 11 from below the second combustion-assisting groove 8. At this time, the cut surfaces 6 of the combustion assist grooves 7 and 8
The opening on the side of A, 6B is expanded, and the air guiding groove 12A,
Since it is 12B, it is possible to make air flow into and out of the through hole 11 smoothly.

Further, the log 2 is divided into four parts by the upper half and the lower half by the two combustion assisting grooves 7 and 8, and the thickness is reduced, so that the combustion speed is increased and the combustion is efficiently performed. Can be performed.

As the combustion proceeds, the sapwood part 4 is gradually dried by the heat of combustion of the core part 3, and its moisture content is reduced to such a degree that it can be easily burned. Along with this, the flame gradually spreads to the sapwood part 4 and combustion continues.
As described above, since the burning of the core material portion 3 and the drying of the sapwood portion 4 can be performed at the same time, the burning can be efficiently performed even if the log 2 is not dried for a long time in advance. .

Further, even after the combustion has started, the outer peripheral surface 5 of the log 2 is not heated until the combustion reaches the sapwood portion 4, and is at a temperature that can be touched by hand. . For this reason, by putting a finger on the carrying recess 14, the wood material for combustion 1 can be easily carried.

As described above, according to the present embodiment, the log 2
By igniting a pilot flame 15 from the through hole 11 provided in the core material part 3, the core material part 3 can be directly ignited. And since the sapwood part 4 is dried by the combustion heat of the core part 3, combustion can be performed efficiently without going through a long-term drying step. In addition, by providing a sharp ignition corner 13 in the through hole 11 and setting the ignition corner 13 as an ignition point, the wood material for combustion 1 can be ignited in a short time.

Further, in the cut surfaces 6A and 6B of the log 2, the combustion assisting grooves 7 and 8 and the air guiding groove 1 connected to the through hole 11 are provided.
Since the 2A and 12B are provided, air is easily supplied from the outside, and the combustion can be performed smoothly. Further, the thickness of each portion divided by the combustion assisting grooves 7 and 8 is reduced, and the combustion efficiency can be increased. Further, the two combustion assisting grooves 7 and 8 are provided so as to be alternate when viewed from above and below. With such a configuration, the entire shape of the log 2 can be maintained while increasing the combustion efficiency.

According to the method for manufacturing a wood material for combustion of the present embodiment, both the combustion assisting grooves 7 and 8 can be formed in the log 2 and simultaneously the through hole 11 and the ignition corner 13 can be formed. It is possible to easily produce the woody material for combustion 1 that can be combusted.

The technical scope of the present invention is not limited by the above-described embodiment. For example, the followings are also included in the technical scope of the present invention. In addition, the technical scope of the present invention extends to an equivalent range.

(1) The combustion assisting groove does not necessarily have to have the shape as in the above embodiment. For example, like the woody material for combustion 20 shown in FIG. Alternatively, a cross-shaped cross section that does not open on the outer peripheral surface 22 side may be used. In the case of such a shape, the space at the axial center position in the combustion assisting groove 23 can be used as the through hole 24, and the four corners facing the through hole 24 can be used as the ignition corner 25. (2) According to the above-described embodiment, the through hole 11 is located at the axis of the log 2. However, according to the present invention, the through hole may be formed so as to be shifted from the axial position. It should just be located in.

[Brief description of the drawings]

FIG. 1 is a perspective view of a wood material for combustion according to an embodiment.

FIG. 2 is a front view of the wood material for combustion according to the embodiment.

FIG. 3 is a top view of the wood material for combustion according to the embodiment.

FIG. 4 is a diagram showing a state in which the wood material for combustion according to the present embodiment is burned.

FIG. 5 is a perspective view of a wood material for combustion according to another embodiment.

[Explanation of symbols]

 1, 20: wood material for combustion 2, 21: log 3: core material 5, 25: outer peripheral surface 7A, 7B, 8A, 8B, 23: combustion assisting groove 7C: bottom surface 11, 24: through hole 12A, 12B: cutting Surfaces 13, 25: corner portions for ignition 12A, 12B: air guide grooves 14: concave portions for carrying

Continued on the front page F term (reference) 2B250 AA40 CA07 DA01 FA01 FA07 FA09 GA03 GA05 HA01 4H015 AA13 AB01 CA01 CA06 CB01 CB02

Claims (6)

[Claims] 1. A wood material for combustion obtained by processing a log cut to a predetermined length, comprising: a through hole axially penetrating a core portion of the log; and an ignition projecting into the through hole. A wood material for combustion characterized by having a corner for use. 2. The wood material for combustion according to claim 1, wherein a cut surface of the log is provided with a combustion assisting groove connected to the through hole. 3. The combustion assisting groove according to claim 1, wherein one cut surface side and the other cut surface side of the log in the axial direction are alternately viewed from the axial direction. 3. The wood material for combustion according to 2. 4. An air guide groove which is continuous with the opening of the combustion assisting groove and which is wider than the combustion assisting groove is formed in the cut surface.
Or the wood material for combustion according to claim 3. 5. The wood material for combustion according to claim 1, wherein a concave portion for carrying is formed in an outer peripheral surface of the log. 6. A pair of first combustion-assisting grooves intersecting at a core portion of the log at a predetermined depth in one cut surface of the log cut to a predetermined length, and the other of the logs. A pair of second combustion assisting grooves reaching the bottom surface of the first combustion assisting groove and intersecting at the core material portion position of the log, as viewed from the cutting surface direction. A method for manufacturing a wood material for combustion, wherein the first and second combustion assist grooves are alternately formed and coaxially intersect with a position at which the pair of first combustion assisting grooves intersect.