JP2017214444A - Log firewood - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a log firewood realizing high energy efficiency and satisfactory in fire retaining at a low cost.SOLUTION: Provided is a log firewood 1A for stove fuel obtained by artificially drying a columnar log, and the log body 10 includes grooves 10a, 10b for drying cut in an arc shape at a prescribed depth so as to pass through a center line from both the cross sections 11, 12 in a step before the drying, the grooves 10a, 10b for drying are opened to the cross sections 11, 12, the opening length thereof is a half of the diameter of the cross sections 11, 12 or more, and the depth of the deepest part is a third of the diameter of the cross sections 11, 12 or more.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a log firewood used as a fuel for a combustion device such as a stove, and more particularly to a log firewood obtained by cutting a log into a cylindrical log of a predetermined length and artificially drying it.

  In recent years, attempts to use thinned wood and surplus timber as fuel have become active from the viewpoint of increasing eco-consciousness and forest protection. However, the wood obtained by logging operations mainly in summer has a high moisture content and requires a long time for drying. In addition to being bad, there is a problem that a large amount of CO2 and smoke are generated.

  Therefore, for example, in a stove firewood, it is also possible to artificially dry wood by placing it in a drying pot. However, if the moisture content is high, this drying process takes a long time and extra fuel is required. This leads to an increase in the production cost of the soot fuel and results in excessive generation of CO2 while wastefully using the combustion energy.

  In particular, log firewood, which has been cut into logs of a predetermined length, has become a popular part among wood-burning stove enthusiasts because of its hobby and good fire resistance. Since the surface area is small, a relatively long drying time is required. In addition, this log soot has a shape that is difficult to ignite as compared with a normal soot, and requires an extra combustion stroke using an ignition soot or an igniting agent, so that it is not easy to use as a fuel. In addition, the overall energy efficiency is said to be low.

  Therefore, for example, as described in Japanese Utility Model No. 3131583, a plurality of cuts (slits) passing through the center of the circle of the cut end are cut so as to be evenly divided from the log end as shown in FIG. Proposals have been made to leave the bottom so that they cannot be separated while forming.

  Thus, since the total area of a cut surface is expanded by cutting in the direction perpendicular to the cut surface (cut end surface) cut into a log shape and providing a plurality of slits, the drying time is greatly shortened. It will be. For example, as shown in the figure, when cut into a depth of about three-quarters from the face of the mouth and divided into eight equal parts, when the moisture content is artificially dried to about 20% or less, there is no slit of the same size. Drying can be completed in about half the time required for the log.

  The cross section by such a slit is cut along a conduit in the tissue of the tree, and since the function of drying the tissue of the tree is weak compared to the end of the tree cut in a direction perpendicular to the conduit, it is dried in a short time. It is necessary to provide a large number of cuts as shown in the figure. However, in order to provide a plurality of cuts radially when viewed from the mouth, it is necessary to perform a cutting operation while rotating the log around the axis and leave a portion that is not cut, which requires labor and cost. It will be.

  Therefore, as shown in FIG. 6, the present inventors / applicants formed slits 10i, 10j, and 10k formed by cutting in parallel to the end surface at a depth of two-thirds or more of the diameter from the outer peripheral surface. Japanese Laid-Open Patent Publication No. 2015-81332 proposes a log bowl 1F which is continuously provided from the end of the tree at a pitch shorter than the diameter in the length direction. In this log 1F, moisture is released and dried through the cut surfaces of the slits in addition to the end surfaces of both ends, so that shorter drying time can be realized and high energy efficiency can be achieved at low cost. Yes.

  However, in wood-burning stoves, after the room has been sufficiently warmed with a relatively large heating power, it is also required to have good fire resistance that continues to burn for a long time with a smaller heating power. However, due to the presence of slits deeply cut into the log, it has excellent ignitability and flammability, but it burns to the center of the firewood in a relatively short time, so it has a fire end compared to a normal log firewood. I have to say that it is insufficient. Further, in the above-described conventional example, there is a problem that the portion partitioned by the deep slit is easily broken during transportation.

Santo No.3113183 Japanese Patent Laying-Open No. 2015-81332

  An object of the present invention is to solve the above-described problems, and it is an object of the present invention to provide high-efficiency log firewood with high heat efficiency and low cost.

  Therefore, in the present invention, in a log for a stove fuel obtained by artificially drying a cylindrical log, the log has a predetermined depth so that it passes through the center line from both log ends before drying. At least one drying groove cut in an arc shape is provided, and the drying groove is opened in the mouth end surface and the opening length is one half or more of the diameter of the mouth end surface. Thus, the depth of the deepest part is not less than one third of the diameter of the mouth end surface.

  In this way, the drying groove was formed by cutting in an arc shape from the log face of the log so that it passes through the center line before drying, thereby promoting drying from the drying groove in addition to the both mouth faces. It can be dried at a lower cost than ordinary logs, and the drying groove is formed at a depth of one-third or more of the diameter of the end without opening on the side of the log. However, both ends of the log are excellent in ignitability and flammability, and the central part of the log that does not reach the drying groove is slowly burned and is excellent in heat retention.

  Further, in this log bowl, the drying groove has a depth of the deepest part of 2/5 to 4/5 of the depth from the end surface to the longitudinal center position of the log. If it is made into the characteristic, it will become the thing which was further excellent in drying property by the groove | channel for drying cut deeply, ensuring the goodness of a fire by leaving the part which is not cut in log central part to some extent.

  Further, in the above-described log bowl, a drill hole having a diameter larger than the groove width of the drying groove is formed on the log along the center line from the both mouth ends to a position deeper than the deepest part of the drying groove. If it is characterized by the fact that the portion deeper than the bottom of the drying groove is easily dried through the drill hole, the portion where the drying groove does not reach with a relatively long log is large. Even if it becomes, it becomes easy to ensure the drying property.

  Furthermore, in the above-described log ridge, if the log is characterized in that the outer peripheral surface is covered with bark, even if it has bark due to the presence of drying grooves on both ends, Since it can be easily dried, it does not require labor and cost excluding the bark, and it is easy to maintain the internal dry state while being excellent in hobby in appearance.

  Furthermore, in the log jar described above, the drying groove has a groove width of 5 mm to 20 mm, and one or two grooves are formed on each face, and the circular mouth is opened in a single shape or a cross. If it is characterized by being, it will become the thing excellent in the designability, implement | achieving the further outstanding drying property and combustibility.

  In addition, in the log cage described above, the log is stored in a flammable storage bag in a dry state and closed with the open end side of the storage bag being squeezed on one side of the mouth end, If the part that is squeezed and protrudes forms an ignition part that ignites first, the ignition work is completed by simply igniting the ignition part of the storage bag. In this case, bark or dust derived from logs does not fall or scatter, and it is easy to prevent the generation of insects and molds.

  According to the present invention provided with a drying groove cut into an arc shape having a predetermined width and a predetermined depth from the end of the wood, it is possible to realize a high-efficiency log firewood with good heat resistance at a low cost.

(A) is a front view of the log bowl which is embodiment of this invention, (B) is a longitudinal cross-sectional view of (A). (A) is a perspective view of the log bowl of FIG. 1, (B) is a perspective view of the modification of the log bowl of FIG. (A) is a front view of an application example of the log box of FIG. 1, (B) is a longitudinal sectional view of the log box of (A). It is a perspective view which shows the state which inserted the combustible sheet | seat in the groove | channel for drying of the log bowl of FIG. 3 (A). (A) is the longitudinal cross-sectional view of the state which put the log bag of FIG. 4 in the storage bag. It is a perspective view which shows a prior art example. It is a perspective view which shows another prior art example.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the present invention, the diameter of the log indicates the average diameter.

  FIG. 1 (A) shows a front view of a log firewood stove 1A according to the present embodiment, FIG. 1 (B) is a longitudinal sectional view thereof, and FIG. 2 (A) is a perspective view thereof. Yes. This log firewood 1A is assumed to use thinned timber and excess timber such as cedar, oak pine, oak, zelkova, kunugi, etc. It is preferably cut into a cylindrical log having a length of about 25 cm to 40 cm suitable for a wood stove, and is artificially dried in a drying apparatus to obtain a log firewood having a water content of 20% or less.

  The reason why the moisture content is 20%, which is much lower than the moisture content (about 50%) of commercially available log logs by natural drying, is that the energy per kg is 2300Kcal when the moisture content is 50%. On the other hand, when the moisture content is 20%, it is 4800 Kcal per kg, so that the energy efficiency is remarkably excellent. In addition, this reduces the amount of smoke during combustion and makes it difficult for soot and tar to accumulate in the flue, which also has the advantage of greatly reducing maintenance work in the wood stove.

  Further, the log bowl 1A has a drying groove 10a, which is cut in an arc shape at a predetermined depth so as to pass through the center line (center axis) of the log body 10 from both the end surfaces 11 and 12 before drying. 10b, and the drying grooves 10a and 10b open to the end surfaces 11 and 12 of the log main body 10 without reaching the outer peripheral surface side, as shown in FIG. It has a bow shape.

  The opening length b of the drying grooves 10a and 10b is at least half of the diameter a of the end surfaces 11 and 12 (preferably slightly shorter than the diameter a as shown), The depth c of the deepest part is not less than 1/3 of the diameter a of the end surfaces 11 and 12 (preferably about 2/3 as shown in the figure), and the depth to the longitudinal center position of the log. It is characterized by being 2/5 to 5/5 of d (about 3/5 is preferable as shown in the figure).

  That is, in the log 1G of the conventional example shown in FIG. 7, slits are formed in the direction perpendicular to the end of the mouth for the purpose of promoting drying and improving ignitability, and the cut surface is increased. In the conventional log bowl 1F, the slit 10i, 10j, 10k is formed with a cut surface in a state in which the conduit is cut at right angles, thereby improving the drying property, but compared with the case without the slit. Thus, drying can be completed in about half of the time for the former and about one-third for the latter.

  However, the log firewood 1G and 1F, in which a slit is formed in the center of the log as described above, has a characteristic of exhibiting high combustibility from the initial stage of combustion to the end. Even after the stage has been sufficiently warmed, the heating power is kept higher than necessary, so that there is a problem that the holding time of the fire tends to be shortened accordingly.

  Therefore, in the present invention, drying grooves (slits) 10a and 10b having a function of accelerating the drying of the log and promoting the combustion thereof are provided so as to open on the end surfaces 11 and 12 of the log body 10. As for the depth, the range in which sufficient drying properties can be exhibited while ensuring good fire resistance by leaving some uncut portions in the center of the log is determined as described above by numerous experiments. It is. As a result, during the period from ignition to warming of the room, both ends of the log exhibit sufficient heating power due to its high flammability, and the central part of the log where the drying grooves 10a, 10b have not reached is burning relatively slowly. In the latter half of the combustion, the bonfire condition is maintained for a long time, so that it is easy to handle and has good fire resistance to meet the needs of the wood stove user.

  Such drying grooves 10a and 10b are provided with an opening width that does not reach the outer peripheral surface of the log main body 10, thereby making it difficult to impair the appearance as a log bowl and breaking due to an impact received during transportation. It is a bite. Further, as shown in FIG. 2 (B), the drying grooves 10a and 10b are formed on the circular wooden mouth surface 11 as shown in FIG. Alternatively, the drying grooves 10a and 10b may be provided so as to cross the drying grooves 10c and 10d so that they are opened in a cross shape. Further, by providing the drying grooves 10a and 10b on both ends of the log in advance before drying, there is an advantage that cracking of the wood is less likely to occur even if there is contraction due to rapid drying.

  The drying grooves 10a and 10b can be easily formed using a small-diameter circular saw when shallow, or the tip side of a small chainsaw when deep, but the opening width (groove width) is It is preferable to set it in the range of 5 mm to 20 mm. Under these conditions, drying is completed in substantially the same time, and almost the same combustibility is exhibited. In other words, it is not technically easy to cut deeply with a narrower width than this, and it tends to result in a delay in drying time due to the narrow groove width, and when the groove width is wider than 20 mm, the slit is In addition to being too conspicuous and deteriorating the aesthetic appearance, the combustion tends to proceed excessively from the wide groove, and the hotness tends to deteriorate.

  Incidentally, a log processed to have the same configuration as the log basket 1A of FIG. 1 described above, a log processed to the same size as the log basket 1G of FIG. Three types of regular logs of the same size and without slits were prepared, and the drying properties (up to 20% water content) with a drying kettle were compared with the heat retention (burning time) in a wood stove. As a result, the drying time of the log candy 1G was about one-half that of a normal log candy, whereas the drying time of the log candy 1A was about two-thirds that of a normal log candy, In terms of time, log 1G was approximately two-thirds of normal log candy, whereas log 1A was approximately three-quarters of normal log candy. From the above results, it was found that the log bowl 1A of the present embodiment is excellent in the balance between the drying property and the goodness of holding a fire.

  In addition, the log basket according to the present invention may be one in which the log to be used has its outer peripheral surface covered with bark, and there is no bark even if it has bark due to the presence of drying grooves on both ends of the log And almost the same dryness and flammability. Therefore, in addition to not requiring labor and cost excluding the bark, it is easy to maintain the internal dry state while being excellent in hobby in appearance.

  FIG. 3A shows a log bowl 1B as an application example of the log bowl 1A described above in a front view, and FIG. 3B shows a log bowl 1B in a longitudinal sectional view. In this log bowl 1B, drill holes 10g and 10h having a diameter (about three times) larger than the groove width of the drying grooves 10a and 10b are deeper than the deepest part of the drying grooves 10a and 10b from both the mouth surfaces 11 and 12. It is characterized by being formed along the center line up to a depth e of a position (preferably about 1.5 times as shown in the figure).

  Thus, in addition to the drying grooves 10a and 10b, the drill holes 10g and 10h deeper than that are formed along the center line through which the grooves 10a and 10b pass. Even if the width of the central portion that does not reach is too large, drying of the portion deeper than the portion exposed by the drying grooves 10a and 10b is promoted through the inner peripheral surface, so that the drying property as a whole is increased. It will be excellent.

  FIG. 4 shows a state in which the ignitable combustible sheet 30 is inserted into the drying grooves 10a and 10b on both ends of the log bowl 1A. The combustible sheet 30 is assumed to have a relatively thick paper impregnated with paraffin or liquid fuel to improve the combustibility. However, as shown in FIG. An ignition part protruding from the end surfaces 11 and 12 can be formed by being inserted into the drying grooves 10 a and 10 b so as to be exposed from the ends 11 and 12.

  Then, as shown in FIG. 5, the log bag 1A of FIG. 4 is stored in a cylindrical flammable storage bag 20 with one end closed and the other end open, and the storage bag on one end side. It is recommended that the inside of the 20 open ends be squeezed while being closed and distributed and stored. In other words, the insects and molds that existed in the logs in the process of artificially drying the logs are killed, but there is also a concern that the insects and molds may grow during the distribution process and storage, so the storage bag 20 This is because it can be prevented by storing and sealing.

  In particular, the log bark with bark, which is excellent in appearance, has a problem that insects are easy to propagate inside the bark and there is a problem that dust from the bark tends to fall off and scatter. This problem can be solved by storing in the storage bag 20. In addition, by providing a water-impermeable resin sheet layer on the inner side surface of the storage bag 20, it is possible to maintain the dry state of the log over a long period of time.

  In addition, by making the storage bag 20 of a combustible material such as paper, it is possible to burn it in the stove while it is put in the storage bag 20, but the portion that is squeezed and projected on the opening end side is the ignition part Therefore, the ignition work is also easy, and in the log wall having a shape difficult to ignite, by igniting the combustible sheet 30 inserted into the drying grooves 10a and 10b through the storage bag 20, It becomes easy to ignite smoothly. Needless to say, the method shown in FIGS. 4 and 5 can be applied to the log bowl 1B of FIG. 2B or the log bowl 1C of FIG.

  And the log firewood according to the present invention can realize high energy efficiency while using surplus wood such as thinned wood and forest residue as fuel, and as a result, the generation amount of CO2 and PM2.5 will be reduced. It is also excellent in terms of reducing energy and environmental problems on the earth. Furthermore, the log firewood according to the present invention has a high combustion efficiency and a small amount of smoke generated, so that it can be used even in densely populated areas, and the maintenance of the stove is easy, while maintaining a lump as a log. In order to realize the burning speed, it has good fire as a fuel for wood burning stoves and is suitable for night heating.

  As described above, it has become possible to provide log firewood with high energy efficiency and good fire resistance at low cost.

  1A, 1B, 1C Log bowl, 10 Log body, 10a, 10b, 10c, 10d Drying groove, 10g, 10h Drill hole, 11, 12 End face, 20 Storage bag, 21 Ignition part, 30 Flammable sheet

Claims (6)

  In a log firewood for stove fuel obtained by artificially drying a cylindrical log, the log was cut into an arc shape at a predetermined depth so as to pass through the center line from both ends of the log before drying. The drying groove is provided with at least one drying groove, and the drying groove has an opening length in the top of the mouth and has an opening length that is at least one half of the diameter of the mouth, and the deepest portion thereof. The log is characterized by having a depth of not less than one third of the diameter of the mouth end surface.   The depth of the deepest part of the groove for drying is 2/5 to 4/5 of the depth from the mouth end surface to the longitudinal center position of the log, The log log described in 1.   In the log, a drill hole having a diameter larger than the groove width of the drying groove is formed along the center line from the both ends to a position deeper than the deepest part of the drying groove. The log candy according to claim 1 or 2, characterized in that.   The log according to claim 1, 2, or 3, wherein the log has an outer peripheral surface covered with bark.   The drying groove has a groove width of 5 mm to 20 mm, one or two are formed on each face of the mouth, and is open in a single shape or a cross on the circular face of the mouth. A log bowl according to claim 1, 2, 3 or 4. The log is stored in a flammable storage bag in a dry state and closed with the open end side of the storage bag being squeezed on one side of the mouth, and the squeezed and protruding portion is the first The log firewood according to claim 1, 2, 3, 4 or 5, characterized in that it forms an ignition part for igniting fire.

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