JP6820883B2 - How to bend wood - Google Patents

Description

The present invention relates to a new bending technique for a board made of wood such as softwood so as to bring out the biological deformation characteristics of the tree in the growing environment. In particular, the present invention makes it possible to produce wooden products such as building members, furniture members, containers, etc. by bending wood into various shapes such as a cylinder, a cone, an arc, and a disk, and a method thereof. Regarding processed products produced by.

In the bending process of plate or square timber, it is widely practiced to soften and deform the timber by artificial humidification and heating techniques. In this method, water molecules are contained between the wood fibers to loosen the fibers, and by heating, the water molecules are expanded to further loosen the fibers, and the polymer substances constituting the wood are softened and deformed. It is something that you try to make.

Using this method, for example, a container manufactured by bending a softwood such as Japanese cedar or cypress with a thickness of 3 to 5 mm into a cylindrical shape is known. Wood is composed of three main components such as cellulose, hemicellulose, and lignin, and these three components have lower cohesive force between molecular chains in a wet state and at a high temperature than in a dry state, and are easily curved. This method makes use of this property.

However, the above heating and humidification treatments need to be done sufficiently and evenly in the wood, but especially in most cases of softwood, once air-dried, the work of returning water to the wood is just water. There is a property that cannot be realized only by soaking, so for a long time in a water tank, a high temperature state or a pressurized / depressurized state is created, and water is forcibly added to condense between the molecular chains of the three components of the wood. The force was reduced, and the wood was heated to make it soft and then curved, but these operations were laborious, costly, and extremely difficult.

Moreover, unlike plastics and metals, wood boards and squares do not always exhibit uniform properties, and because they have tensile and compressive properties depending on the tree species, they are deformed even if they are sufficiently heated and humidified. There was a problem of destroying it at the time.

Therefore, when deforming a square timber or plate made of wood, a steel band is applied to the side that becomes the tension surface to protect it, and the band iron and the wood are integrally bent and bent in a high temperature and high humidity state to destroy the wood. The Tohnet method has been developed to realize bending without bending.

As a method of further enhancing the material deformation characteristics of wood, the artificial softening technology has been developed, and the deformation technology under high temperature and high pressure steam is also known. With this technology, which can raise the temperature several times higher than boiling at 100 ° C, the polymer substances that make up wood are softened, and deformation close to plastic deformation and press deformation are possible.

On the other hand, there is also known a method of deforming a plate or square timber made of air-dried wood within a normal elastic range. As this method, a method of bundling a plurality of sheets within the elastic range, bending them, and pressing (fixing) them with an adhesive is used. For example, there is a bowl-shaped container in which wood having a large elastic range such as beech in an air-dried state is cut into a strip shape and curved to be rolled into a roll-shaped deformed material to form a cone. In addition, if it is a building structural material, a method of producing a maximum curved laminated wood by bending it within a range not smaller than the minimum radius of curvature using the tree species and grade specified in JAS and fixing it with an adhesive is disclosed. Has been done.

In this way, in the conventional method, the material deformation characteristics of the tree species suitable for each method are realized by applying an external force using conditions such as humidification / heating, high temperature / high pressure, and compression. However, the deformation curvature must be limited to some extent according to JAS, and wood species that are not suitable for each method and wood with a length and thickness that cannot be subjected to external force cannot be deformed. There was a need for an environment according to the conditions, and the conditions affected the materials, which hindered the use of various tree species.

For example, in the humidification / heating method and the boiling method, while the wood can be deformed beyond the original elastic range, a large-scale device such as a steamer or a water tank for humidification / heating / boiling is required. Moreover, not only the equipment such as the steamer and the water tank becomes complicated, but also the size of the equipment is limited, so that it is not possible to process wood having a length exceeding the equipment. In addition, it is necessary to perform bending work quickly and quickly before the temperature of the wood drops, which imposes a burden on the workers in that environment, and by performing heat treatment and humidification treatment, the original nature of wood is achieved. It has the problem of losing its beautiful color and luster.

Even in the method of deforming a plate or square wood made of air-dried wood within the normal elastic range, in order to bend it all at once and press (fix) it with an adhesive, repulsion (springback) due to stress during fixing is required. It is necessary to press firmly and heat (if it is a heat-curable resin adhesive such as phenol resin commonly used for bonding in laminated lumber production) until the adhesive is completely solidified so that it does not occur. Since it is necessary to bend the wood within the allowable stress range, it was not possible to increase the curvature of the bend. In addition, depending on the degree of bending, there is a problem that the stress of the springback that tries to return to the original flat plate material always occurs even after bonding, and it is strong and has weather resistance, heat resistance, durability, etc. depending on the application. Because a good adhesive is required, it can be used for relatively small curved parts, designed with a large radius of curvature, or the thickness of the board itself can be reduced to limit furniture or containers. There was no choice but to use it for use, and there were restrictions on its application to woodwork products as well as restrictions on deformation processing.

A so-called rotary race is known as one of the methods for reducing the thickness of the plate itself to make it easier to bend, but this also rotates a humidified and heated log in a large-scale bathtub. It is necessary to cut while cutting, and then to dry the peeled single plate with a dryer, which requires such a large-scale equipment and energy consumption, and the return on investment often poses a problem. In addition, in order to efficiently obtain thin sheets suitable for manufacturing products, it is necessary to select tree species that are difficult to expose, and most of them rely on imports from Europe, and such elastic hardwood thin sheets are used. In the process of wrapping the wig while bending it like a beech, it is easy to bend, but it easily returns to the original straight line, and skill is required in how to apply force when wrapping, so workability is not always possible. It was necessary to have the cost and time for the work, such as not being excellent.

As described above, in the above-mentioned various conventional methods, the tree species and materials that are not suitable for each method and the wood having a length and thickness that cannot be applied with an external force are not targeted for deformation, even if they are deformed. Even if it could be deformed, it was difficult to handle, and there were significant restrictions on various deformations and utilization of various tree species.

Furthermore, from today's social background, the possibility of various transformations for various tree species is required. In other words, in Japan, the Ministry of Agriculture and Forestry once led the active development of coniferous plantations such as sugi, and in recent years, effective use of trees and thinned wood in these mature plantations is desired. ing. However, the import of sawn timber, which is cheaper and stronger than domestic artificial forest materials, has forced sawmills opened in forestry areas to close down one after another, and there are sufficient trees in these artificial forests. Not only is it not being used, but the industry that uses domestically produced artificial forest materials is declining.

From the above problems, new technology that can deform and process wood inexpensively and quickly, and new technology that can effectively utilize unused domestic artificial forest materials without using large-scale equipment and revitalize domestic industry It is desired.

Japanese Unexamined Patent Publication No. 09-220708 Japanese Unexamined Patent Publication No. 04-147803 Patent No. 4449065

Manufacturing conditions and mechanical properties of a cylindrical LVL manufactured using the spiral winding method (J. Soc. Mta. Sci, Japan), Vol. 47, No. 4, pp. 350-355, Apr. 1998), Hidefumi Yamauchi et al.

Therefore, an object of the present invention is to provide an inexpensive new method capable of more flexibly drawing out the deformation characteristics of wood so that the shape strength and the degree of freedom in design can be achieved. In addition, a method and its method that can easily and inexpensively produce high-value-added curved lumber using tools and jigs that can be prepared at sawmills in various regions without being limited by tree species, materials, and length. It is to provide building structural material, curved decorative material, furniture member, wooden container and the like from the curved material manufactured in this way.

Further, an object of the present invention is to enable bending processing on various kinds of wood, promote the use of trees in planted forests, activate the mountains by appropriately thinning the planted forests, and close the business. To provide new methods that can contribute to the industry that is being driven into the industry, and building structural materials, curved decorative materials, furniture members, wooden containers, etc. from the curved materials manufactured in this way. is there.

Furthermore, an object of the present invention is to promote the effective utilization of coniferous wood, which is often produced in domestic plantations, without heat treatment and beyond the permissible stress level of each wood shown in an air-dried state. , A method that can produce a curved material from softwood wood and a curved material produced in this way by a simpler method than the case of manufacturing by conventional bending and laminating processing using hardwood beech, Mizunara, etc. as a material. The purpose is to provide building structural materials, curved decorative materials, furniture members, wooden containers, etc.

Therefore, the present invention is a method for drawing out the biological deformation characteristics of a tree in a growing environment without artificial humidification and heating operations, and is above the fiber saturation point that can be used as a green material after felling. The shape of the support is a strip-shaped plate maintained at a moisture content of, for example, 30% or more, in which the grain direction is relatively oriented toward the longitudinal direction rather than the lateral direction of the plate material. According to this, a force that gradually stretches between the fibers of the strip-shaped plate is applied while shifting the position along the longitudinal direction thereof to deform the strip-shaped plate, and the deformed state is held by the holder to deform the predetermined intermediate body. The deformation and holding step of holding the strip in the shape of the above, and the water content of the strip-shaped plate below the water content of the fiber saturation point, for example, the water content of the air-dried state or less, or The present invention provides a processing method including a drying step of drying to a state where the water content is 12% or less.

Further, in the above-mentioned processing method of the present invention, in the deformation and holding steps, i) applying a force while shifting the position within a predetermined interval along the longitudinal direction within a predetermined interval, ii) pressing at a position where the force is applied. The force is applied under at least one of the above conditions i) and ii) that the speed is equal to or less than the predetermined speed, and the trees to be used are Ginkgophyta Ginkgoales, Ginkgoales, Cupressaceae, and Conifers. It is selected from Pinaceae, Araucariaceae, Ginkgoales, Coniferae, Cupressaceae, Cephalotaxaceae, and Yews belonging to the order.

In addition, instead of or in addition to that, the deformation in the above-mentioned deformation and holding step is carried out i) coldly, ii) using a hot bath facility obtained from nature, the moisture content above the fiber saturation point before deformation. It may be performed after the step of heating while keeping the temperature.

Further, in the present invention, after the drying step, the holding state is released to form an intermediate made of the strip-shaped plate, and the strip-shaped plate of the intermediate is further deformed into a desired shape. It also provides a method.

Furthermore, the present invention provides a method for producing a material element in which the deformation characteristics of a plate material or a square material made of wood are brought out by applying the above method.

Further, the present invention is such that the material element produced by this method is fixed at least in the overlapping portion of the material element, or is fixed with other member elements to maintain a predetermined shape. The production method of the processed product and the processed product are also provided.

Further, the present invention also provides a woodworking product composed of laminated building materials, furniture materials, craft materials, wood processing materials, and members obtained from the above-mentioned processed products.

According to the present invention, it is possible to perform processing that does not require heat treatment and exceeds the allowable stress of each wood shown in an air-dried state, and it is possible to perform processing of wood that is often produced in domestic plantations, such as coniferous trees. It has become possible to promote the effective use of wood. In addition, by promoting various and flexible bending processes, the range of use in processing fields such as building structural materials, curved decorative materials, furniture members, wooden containers, etc. has expanded, and artificial forest materials can be used more effectively. It became.

The processing method for bending wood according to the present invention is to make wood that has been maintained at a moisture content above the fiber saturation point into a curved strip material before drying to a moisture content below the fiber saturation point. The cell wall and middle lobe are extremely damaged by not performing heat treatment and humidification treatment to soften cellulose, which is one of the three components constituting the above, and by bending using the allowable stress of the cell wall and middle lobe. It has become possible to prevent cracks and breakage of wood by suppressing this, and it has become possible to provide high-quality curved and wound materials, building structural materials, furniture members, wooden containers, etc. It was.

Further, in particular, even in softwoods which may contain living nodes relatively often, it is possible to easily bend the softwoods without damaging the materials. In particular, when processing a plurality of laminated strips, the strips having live nodes can be used by putting them in the middle of the laminate, which does not significantly affect the strength and is designed. It does not spoil the aesthetics of the obi. Thinned wood and heartwood have knots, but since their use can be expanded, it is possible to expand the range of effective use of resources, and CLT (Cross Laminated) promoted by the Forestry Agency and the Ministry of Land, Infrastructure, Transport and Tourism. It also contributes greatly to Timber (Cross-laminated timber), and also contributes greatly to the diversity of architectural design and the development and revitalization of local industries.

Further, according to the present invention, a large-scale device such as a steam chamber and a water tank, which is required in the conventional method, is not required, and the process can be greatly simplified. Further, in relatively small woodworking, it is possible to use only the clamp and then process it while applying force by hand to maintain the shape.

Furthermore, regarding the limitation of the length of timber, the maximum length is limited to the convenience of transportation after felling, the capacity and space of the sawmill, for example, the maximum length of 4 m that is transported to a general sawmill in Japan. With the log material of No. 1, it is possible to manufacture a curved material that makes use of a plate material with a maximum length of 4 m that is sawn on the spot.

Furthermore, according to the present invention, it is possible to prevent springback from occurring after bending into a desired mold, it is not necessary to use a strong adhesive, and if it is applied to an indoor processed product, it is harmful to the human body. A sufficient construction method can be provided even if an ordinary vinyl acetate resin adhesive (bond for woodwork) that does not use a formaldehyde phthalate plasticizer is used.

Furthermore, according to the present invention, it is also possible to provide a processed product in which the color and scent of wood, phytoncide effective for maintaining health, and ingredients having antiseptic and insect repellent effects can be tasted as they are because heat treatment is not required. It will be possible.

Furthermore, it is not necessary to use the expensive rotary lace required in the prior art to produce the curved strip material, only a woodworking machine such as a band saw or a tipped saw needs to be used, and the rotary lace is possessed. Even in ordinary sawmills, wood cutting machines can be integrated, making it easy to manufacture.

From the point of view of processed wooden products, in the case of building materials, solid long materials can be used as arch-shaped building structural materials with a smaller radius of curvature than before, so only the dome-shaped roof found in Byzantine architecture, Gothic style The arch structure of the ceiling and pillars that can be used is made possible by using coniferous wood materials such as sugi, which symbolizes the Japanese taste, and the degree of freedom of application in the previously difficult design of architectural curved surfaces is increased.

Further, when the attic member is arched, the curved member formed by making cuts in the member at equal intervals can be replaced with the curved laminated wood by the method according to the present invention. Furthermore, in the CLT promoted by the Forestry Agency and the Ministry of Land, Infrastructure, Transport and Tourism, it will be possible to manufacture curved CLT, which will enable buildings with a curved design and significantly increase the consumption of wood. ..

For furniture applications, the ring-shaped strip material is not limited to a concentric one, and can be, for example, S-shaped, and the width and thickness can be freely set. For example, even if the thickness is 5 mm to 10 mm, bending can be performed if the radius of curvature corresponds to the thickness. As a result, it is possible to perform bending processing with a strip-shaped material having an arbitrary width and thickness according to the specifications of the product, and it is possible to manufacture chairs and other furniture of assembled processed products in general. In addition, since stable supply is possible, it is possible to easily provide a living space with a curved line to a living space for human beings, which tends to be composed of straight lines.

Furthermore, it is possible to redefine the utilization of Japanese planted forests and softwoods from the design and structural aspects. Since it is not heat-treated, there is no bitter color caused by heat treatment, and you can enjoy the beautiful color scheme and aroma of Sugi in your living space. Specifically, it can be applied to chairs, sofa side tables, tables, chairs, cleaning robots, smart phone audio magnifiers using four-sided bending plates, and the like. Wood springs and wood springs can also be used as members. Depending on the designer, it is possible to propose a woody design that will change your life.

As a container application, a plurality of roll-shaped strips having the same radius or different radii can be arranged concentrically, and a container having a wide variety of shapes can be manufactured. Further, although a "magewappa" or other "bent" container can only be manufactured at a very high price by the prior art, the present invention makes it possible to manufacture the container at a low cost. Specifically, it can be applied not only to high-grade lacquer ware, but also to ekiben and convenience stores because it can be supplied in large quantities at low cost, plates for fast food, lunch boxes, bowls, beer mugs, and the like.

It is a block diagram of the method of drawing out the deformation characteristic by this invention. It is an overall schematic diagram which showed an example which cut out the strip material 11 from the wood 10 in the fiber direction by using a band saw 20. It is the whole schematic diagram which showed an example which cut out the strip material 11 from the wood 10 in the fiber direction by the disk of the tip saw 30. FIG. 5 is a side view of a state in which a plurality of strip members 11 are stacked and a protective material 12 is placed on one surface thereof, corresponding to the process of step S3 in FIG. It is a perspective view which showed the bending process of the 1st form corresponding to the process of step S4 of FIG. It is a perspective view which showed the bending process of the 2nd form corresponding to the process of step S4 of FIG. It is a perspective view which showed the bending process of the 3rd form corresponding to the process of step S4 of FIG. It is an overall view of the state in which the strip material 11 is curved and wound by the construction method according to the present invention, wound into a roll shape, and dried. It is a state diagram which added new strips 11 and connected adjacent strips 11 with tape 105. It is a conceptual diagram which makes a container from two kinds of strips 11 wound in a roll shape by the construction method by this invention. It is a conceptual diagram which constitutes a cylindrical plywood 13 of a building material by combining a plurality of strips 11 which were curved in the fiber direction and deformed into a spiral shape by the construction method according to this invention. FIG. 5 is a conceptual diagram of a mixed cylindrical plywood 13 in which a curved strip plate material 11 obtained by the method of the present invention and a strip plate 110 obtained by a conventional method are combined. It is a perspective view of an example of a wooden processed product using this invention. It is a perspective view of an example of a wooden processed product using this invention. It is a perspective view of an example of a wooden processed product using this invention. It is a graph for demonstrating the fiber saturation point 60. It is a graph for demonstrating the equilibrium moisture content. It is a conceptual diagram which shows the relationship between the structure of a cell having water content above a fiber saturation point, free water 66 and bound water 67. It is a conceptual diagram which shows the relationship between the structure of the cell which has the water content less than a fiber saturation point, and free water 66 and bound water 67.

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram for explaining a deformation method according to the present invention, which shows an example of an overall treatment of wood processing according to the present invention.

The raw material cut from the tree is cut into a plate material 10 having a predetermined thickness d1 from the raw material in the state of a green material without being dried (step S1).

More preferably, the condition of the wood before the deformation process is closest to that of a tree in a standing tree that has deformation characteristics corresponding to bending stress and physical environmental damage due to wind and snow, immediately after felling (early after felling) and immediately after sawing (sawning). Later). By deforming the wood in a state close to that of a living body, it is possible to bring out the biological deformation characteristics of wood.

For example, the moisture content (total drying method) immediately after cutting coniferous Sugi wood is about 200% on average for sapwood and about 80% on average for heartwood, regardless of the season. When the moisture content of both sapwood and heartwood is below the fiber saturation point of about 30%, the cell wall and intercellular layer begin to dry and shrink, and when the moisture content drops to the air-dry state for daily use in Japan, the shape of the plate and square lumber changes. It deforms significantly. Once the water content is lowered below 30%, even if the water content is increased again, the stress of the cell wall (mainly the primary wall with a large proportion of gel-like matrix) and the pectin-based middle lobe will increase. It becomes difficult to recover, and although physical deformation is possible, it becomes difficult to expect biological deformation characteristics.

If it takes a long time to make the plate 10 after cutting it into a raw material, it can be maintained indefinitely by keeping it in a dry and antiseptic storage state. If the state in which drying and decay can be prevented can be maintained, the effect of eliciting biological deformation characteristics can be maintained by deforming the wood structure according to the present invention.

In a preferred form, if the desired tree species is not a tree species such as the genus Thujopsis or Thujopsis dorsalis containing a highly antibacterial resin component, the antiseptic treatment is a freshly sawn cypress wood or a mixed pack with asunaro or hinoki asunaro wood, or hinoki cypress. It is a pack to which oil or cypress oil is added. By using hinoki wood, asunaro material, hinoki asunaro material, hinoki oil, hiba oil, etc. at the same time, it is possible to further prevent deterioration of the wood structure and improve the deformation success rate during the deformation processing process after opening. The efficiency of the method of the invention can be improved.

Next, in step S2, from the plate material 10 having the predetermined thickness, the thin strip-shaped plate 11 (“strip plate material”) having the width in the thickness direction is made to have a constant width d2 and thickness d1. Cut out to. For cutting, for example, as shown in FIGS. 2A and 2B, a cutting device such as a band saw 20 (FIG. 2A) or a tip saw 30 (FIG. 2B) can be used.

The width d2 and the thickness d1 are arbitrarily set according to the application (various applications such as construction, furniture, wooden container, etc.). Then, it is desirable to cut out the plate grain material 10 in advance by a cutting device so that the extending direction of the fibers of the strip material 11 faces the longitudinal direction of the strip material. Ideally, the direction of the fibers of the strip member 11 and the longitudinal direction of the strip member 11 are the same, but when wood is sawn, the grain differs depending on the place to be cut, and the grain is different from that of the grain. It will represent various patterns of eyes and grain. Therefore, in the deformation processing of the present invention, it is preferable that the direction of the plate grain is relatively oriented in the longitudinal direction with respect to the lateral direction (that is, the width direction and the thickness direction) of the strip member 11.

The meaning that the extending direction of the fibers of the strip material is toward the longitudinal direction of the strip material means which direction the fibers are closer to in the direction of the short side of the strip material, and is not necessarily the fiber. It does not mean that the orientation of is exactly the same as the orientation in the longitudinal direction.

Therefore, especially when cutting softwood, as long as it is cut in the fiber direction, it can be cut in the same way without considering the grain and the grain, and it can be used as a material after cutting. When used as a material, although it depends on the condition of care and materials during growth, it is generally the case of abnormal tissues (heart cracks / cracks, skin cracks, pits, missing nodes, dead nodes, etc.) in which the tissues are divided. All you have to do is remove the part.

Next, one strip member 11 or a plurality of strips 11 obtained by cutting out are overlapped and curved (step S4). Even at this time, the water content of the tree in the standing tree must be such that it has deformation characteristics corresponding to bending stress due to wind and snow and physical environmental damage so that the biological deformation characteristics of wood can be brought out more. Preferably, when it is necessary to store each strip material 11, the storage state is set to be dry and antiseptic as in the above description so as not to fall below the water content of at least the fiber saturation point.

A plurality of strips 11 can be used to bend the plurality of strips 11 at a time, but the number of strips 11 does not necessarily have to be a plurality, and the strips may be deformed one by one. In the present specification, when the strip material 11 to be bent (curved) is described, it may be one strip material 11 or a plurality of strips, unless otherwise specified. The strip material 11 may be used.

Next, in step S3, a protective material 12 having a predetermined thickness may be placed on one surface of the strip member 11 before the deformation such as bending is performed.

As the protective material 12, thin strip-shaped wood, resin, metal, or the like can be used, but it is preferable to use strip-shaped plywood cut so that the fiber direction of the surface layer of the plywood faces the lateral direction. The bending resistance of the plywood can be reduced by moving it in the short direction. The strip-shaped plywood preferably has the same width in order to bend integrally with the strip material 11, but is not necessarily limited to this. Further, depending on the degree of bendability of the strip member 11, it is optional whether or not the strip member 12 is provided because the bending process can be performed without damaging the strip member 11 without providing the protective member 12.

The protective material 12 is usually preferably provided at least on the convex side in the direction of curvature (described later). Since the strip material 11 having live knots is weaker in strength than the strip material without knots, the strip material having live knots is placed on the innermost side of the laminate (that is, the concave side of the curve). ), In order to reinforce the portion, the protective material 12 may be placed on the inner surface thereof.

When wood (plywood) is used as the protective material 12, the thickness is preferably 2.3 mm, which is the thinnest in the JAS standard in Japan, and the fiber direction of the plywood surface layer is different from the longitudinal direction of the plywood, that is, By using plywood that faces the short side of the plywood, it can be easily curved.

Next, the process proceeds to step S4, and the strip member 11 (for example, the laminated body 14) is bent.

Until this bending process is performed, the strip material 11 is stored in a dry and antiseptic state in the same manner as in lumber and cutting and storage from lumber to plate so as to utilize the deformation characteristics of the wood in a state close to that of a living body. In the cold state, the water content of the fiber saturation point (60) or higher, usually the water content of 30% or higher, is maintained.

In performing step S4, a support for supporting the bent strip member 11 is separately prepared. The support may be one, or may be composed of a plurality of supports. The support 5 can take various forms. 4A to 4C show bending processing using the support 5 according to the first to third forms, but the present invention is not limited to this form.

In FIG. 4A, the support 5 has a circular ring shape having a width substantially the same as the width of the strip member 11. FIG. 4B shows an embodiment in which the strip member 11 is wound around the surface of the columnar support 5 in a spiral shape, and FIG. 4C shows a plurality of circular supports 5 arranged in a substantially coaxial manner in the axial direction. An embodiment is shown in which the strip member 11 winds around the surface of the plurality of circular supports 5.

Which form to use may be appropriately selected depending on the size and thickness to be used. For example, in the embodiment of FIG. 4B, for example, a cylindrical empty can is used as the support 5, and the thickness is 1 to 1. A container such as a mug could be made by spirally winding a tape-shaped strip material 11 having a width of about 1.5 mm and a width of about 10 to 30 mm around the surface of an empty can.

Explaining the deformation process in more detail by taking FIG. 4A as an example, the support 5 of the circular ring is a ring formed by extending a surface having a predetermined width toward the outer side in the radial direction in the circumferential direction. Is forming. A part of the strip plate material 11 whose water content has been maintained at 30% or more in a cold state is pressed against the outer surface of the ring, and a ring-shaped shape is formed by a holder 35 such as a one-hand clamp. It is held on the outer surface of the support 5. At this time, the strip member 11 extends in a substantially tangential direction with the outer surface of the support 5. The position of the strip member 11 slightly deviated from the held position is defined as the pressing position. On the other hand, in the support 5, when the strip 11 is appropriately bent along the outer surface of the support 5, the strip 11 appropriately abuts on the ring surface of the support 5 at the pressing position. The position to be formed is defined as the contact position. Therefore, normally, the length between the holding position and the contact position on the outer surface of the support 5 and the distance between the position of the strip member 11 held on the support 5 and the pressing position are substantially the same. Is. It is preferable that the force for pressing the strip member 11 at the pressing position is gradually curved so as to be constantly directed toward the contact position on the support 5. For this pressing, a holder 35 such as a one-hand clamp can be used. When a one-hand clamp is used, the position inside the contact position of the support 5 and the position outside the pressing position of the strip member 11 are sandwiched by the one-hand clamp so that the two positions do not shift. Gradually tighten.

By tightening the strip member 11 and the support 5 by pressing toward the contact position of the support 5, the pressing direction against the strip 11 gradually goes toward the center of the diameter, and finally the strip 11 is supported. It will be curved to the contact position of the body 5. The pressing position is determined so that the holder 35 does not shift on the surface of the strip member 11 and the force due to pressing is not extremely concentrated on one point of the strip member 11.

When the support 35 is pressed and deformed by the holder 35 and the support 5 is held at one position, the support 5 is pressed and deformed at the next position in the same process with that as a fulcrum, and this deformation is sequentially advanced. This makes it possible to form the ring-shaped or roll-shaped strip member 11.

The pressing direction and its pressing force, or the pressing direction, the pressing pressure and the pressing speed, are the toughness of the strip material 11 which has been maintained at a water content of 30% or more in the cold state, which is inherent in raw wood. It is appropriately determined as long as the strip material 11 does not break. The detailed state of the fibers inside the strip material 11 at this time is not always clear, but since the strip material 11 is formed so that the extending direction of the fibers of the strip material is in the longitudinal direction of the strip material, the progress of deformation It is considered that the direction is almost the same as the direction in which the fiber is stretched (this does not mean that the fiber is completely matched), and the original toughness of the raw wood that can be bent without breaking is exhibited.

When the deformation process is performed by hand, the reaction of the deformation obtained from the strip material 11 can be felt very sensitively by hand, so to speak, a force is applied so that the cells are displaced from each other. Even if the connection between some cells is broken, the cells are extended while being connected as a whole, or the wood tissue is deformed without being destroyed as a whole, and the appearance and substance as a product It can be clearly felt as a change in the cells inside the strip 11 that the deformation characteristics are brought out without impairing the strength.

As described above, while pressing toward the surface of the support ring and pressing the strip 11 so as to contact the outer surface of the support 5, for example, the surface of the support 5 is used by using a holder 35. Hold on. Further, a part of the strip member 11 slightly separated from the holding position in the traveling direction in which the deformation is gradually performed is pressed from the radial outer direction of the support ring toward the surface of the support ring. Bending is gradually performed while repeatedly moving, pressing, and holding along the direction of deformation. In this way, with respect to the strip-shaped plate whose water content is maintained above the fiber saturation point, which can be used as a green material after felling, the force for gradually extending the fibers is applied while sequentially shifting the position along the longitudinal direction. The method of the present invention that gradually expands the deformation while drawing out the deformation characteristics by adding it is called the Gradually Stretch Cold Bend Method (GSCB method).

As one of the specific examples, as the strip material 11, a sugi strip cut out to a thickness of 8 mm, a width of 100 mm, and a length of 4000 mm with a water content equal to or higher than the fiber saturation point in the green material after felling was used. It was confirmed that the sugi strip was coldly deformed in a spiral shape in accordance with the support 5 of a cylindrical body having a diameter of 660 mm. This result shows that the deformation characteristics of the sugi material can be effectively extracted by the characteristic extraction method according to the present invention even if the thickness is 8 mm.

FIG. 4B in which the strip member 11 is curved in a cylindrical shape in a spiral shape and FIG. 4C in which the strip member 11 is curved using a plurality of supports 5 are basically different from the bending method of FIG. 4A. However, the fiber direction is relatively oriented in the longitudinal direction of the strip member 11, the direction of deformation of the strip material 11 substantially coincides with the direction in which the fiber extends, and the next is supported by one point or region on the surface of the support 5. When the strip member 11 is pressed at a point or region, the strip member 11 is gradually deformed so as to move toward the center of the radius of curvature of the outer surface of the support 5 at each contact position or region toward the traveling direction. It is preferable to press on.

Further, in any of the processing examples, when the pressing force becomes strong and rapid bending processing is performed, the strip member 11 does not always stretch on average, and the force of the overall moment is partially applied. It may be concentrated and break. Therefore, in the above-mentioned deformation step, the overall moment is not extremely concentrated in one place, or the region portion held by the holder 35 of the strip member 11 and its vicinity are stretched to form the surface of the support 5. The pressure is such that it curves along.

Further, in order to avoid concentration of pressure due to rapid bending, it is preferable to deform the wood structure while applying a force at a speed equal to or lower than a predetermined speed. The predetermined speed can be appropriately determined according to the tree species, site, moisture content, plate thickness, plate width, grain direction and quality, bending diameter, etc. of the plate material. For example, when a sugi material, a core material, and a plate material having a water content of about 80%, a thickness of 6 mm and a width of 60 mm with knots and cuts are used for a circular support 5 having a diameter of 600 mm, the speed is about 60 minutes per round. It was possible to perform circular bending in.

In FIG. 4C, a plurality of bicycle wheels are used, and the inside of the wheel is supported by a plurality of pillars. Even when the adjacent wheels are not in close contact with each other, the strip member 11 can be deformed by utilizing the outer surface of the wheel due to the specific density of the wheels. As described above, it can be understood that the value of utilization is remarkably improved because a relatively large curved processed product can be provided by making the support 5 a structure that can be easily constructed.

Further, in the above example, the strip member 11 is deformed along the outer surface of the support 5 to be a mold, but the inside of the support 5 to be a mold in FIG. 4A is used depending on the purpose. You may. For example, the strip member 11 is bent along the inner surface of the support 5 so as to crawl on the inner surface of the support 5, and further wound inward, so that the strip member 11 is rolled inside the support 5. Can be formed. The pressing method for the deformation process to the strip member 11 in this case is not substantially different. Actually, compared to the case of using the outside of the mold, the thickness and width of the strip material applicable to the inside needs to be small, for example, 1 mm or less in thickness and 10 mm or less in width. Whether or not to use the surface may be appropriately selected according to the purpose.

When the length of the strip member 11 is insufficient in the roll-shaped bending process, another strip member 11 is prepared, the tips of the two strips 11 are abutted against each other, and the strip member 11 is continuously deformed. It is possible to continue winding in a roll shape.

In this way, by adopting the GSCB method, it is possible to deform even if it contains non-uniform components of the wood structure before deformation, such as knots, pads, and cuts during sawing, according to the method of the present invention. It became clear that efficiency could be improved.

The tree species are not particularly limited, but are selected from, for example, Ginkgoales, Ginkgoales, Ginkgoales, Conifers, Pinaceae, Araucariaceae, Cephalotaxaceae, Cupressaceae, Cupressaceae, Cephalotaxaceae, and Yews. Can be a tree species.

Any support or holder can be used as long as the strip member 11 can be curved and held in a desired shape. Further, although pressing and holding can be performed with one jig or the like, separate jigs or the like can also be used. For example, the pressing applied to the strip material 11 for bending can be performed manually, or a force for pressing and deforming the strip material 11 placed on a certain part such as a mold or a table can be applied. , Existing bending equipment such as a bender equipment capable of press working may be used.

The above-mentioned deformation step in step S4 can be carried out coldly, but heating such as a hot bath or steam may be carried out before or during the deformation.

For example, the strip material 11 before the above-mentioned deformation step is deformed in the above-mentioned deformation step immediately after being heated to the inside of the wood with a hot bath such as a hot spring obtained from nature or steam. By adding such a step, in addition to the biological deformation property, the material deformation property is added, the deformation success rate during the deformation step can be improved, and the efficiency of the method of the present invention is improved. Can be made to.

For example, as a means for performing a hot bath, when a hot spring bathtub of a desired size cannot be used, hot spring water is put into a water tank using a PVC pipe to warm the strip plate material 11, and the heat absorption rate is high. It may be covered with a film such as a black plastic bag and exposed to the sun for several hours or more.

PVC pipe water tanks and black plastic bags are easy to obtain even if they are long and large, and it is relatively easy to add material deformation characteristics to the desired long lumber and square lumber at low cost. It becomes possible to do.

After the deformation processing in step S4 is completed, in step S5, the processed product is dried, preferably in a state of fiber saturation or less, for example, a state in which the water content is less than a predetermined water content of less than 30%, preferably an air-drying state. It is dried to a moisture content of 12% or less, more preferably 12% or less.

From various tests, when the water content is less than 30%, for example, about 25%, it returns to smoothness by springback. If it is dried to a moisture content of 20% or less, the effect of springback will be reduced and it will be fixed to a level that can be used in products, and if it is about 15%, it will be sufficient to be used in products in terms of shape fixing. It was found that the shape was almost fixed when the moisture content was dried to about 12%. The moisture content in the air-dry state (also called the equilibrium moisture content), in which the moisture content of wood is in equilibrium with the humidity in the air, depends on the season and region. In some areas of Japan, it is around 17% during rainy season and 6 in winter. Although it is around%, it was also found that the deformed strip material 11 should be dried until it becomes such an air-drying state. The moisture content will vary depending on the type of material used and the conditions, but it is sufficient to set a predetermined moisture content according to the conditions in advance and dry it below the predetermined moisture content to make it more dry. A device such as a dryer may be used to speed up the process.

Due to this drying, the cell wall and the intercellular layer begin to dry and contract, so that the strip material 11 is deformed because its shape is fixed, so that the shape is relatively maintained even if the holding is released after drying. .. In this case, the above-mentioned deformation characteristics due to biological toughness are lost, but material deformation is possible. That is, according to the present invention, when the cell wall structure is curved within a range that does not substantially destroy the cell wall structure, the shape is maintained, and the cells are dried, the cell wall and the middle lobe are in a positional relationship with each other so as to form a cell arrangement showing a high amount of deformation. It is thought that it acts to maintain its shape while having elastic properties that are in a deformed state. That is, further curvature is possible from the shape after drying. In addition, it was found that the deformation and shrinkage of the wood due to drying as in the past are small, so that the deformation of the finished product is extremely suppressed.

Further, a temporary deformation process may be incorporated during the drying step of step S5. For example, the roll-shaped strip 11 of FIG. 5A can be made in this way. More specifically, first, in step S4, as shown in FIGS. 4B and 4C, the strip member 11 wound in a spiral shape is formed. After a certain degree of drying process, the spirally held strip member 11 gradually shifts from the conventional shape to the held shape, and the springback force becomes weak. In the middle of the drying process at the stage where the force of the springback is weakened and the shape is not completely fixed, the material is deformed into the roll-shaped strip 11 as shown in FIG. 5A and held in the roll shape. Hold using tool 35. After that, the drying step is further carried out to dry the strip material 11, and the strip material 11 having a fixed roll shape can be produced.

In step S6, the elastic property whose shape is fixed by drying is utilized, and the strip plate material 11 is applied as an intermediate to the final product, and the modified processed product whose shape is fixed after drying is applied. It is applied to products to manufacture processed products.

As described above, first, a strip-shaped plate material having a predetermined thickness in the fiber direction is sawn from a raw material (green material) such as coniferous trees. At this time, the fiber direction is relatively oriented in the longitudinal direction of the strip-shaped plate material. Further, by gradually bending the strip-shaped plate material along the outer peripheral surface of the foundation or the mold such as a ring shape or a cylinder shape, the strip-shaped plate material is finally curved and deformed. That is, local bending is performed while gradually shifting the position along the outer peripheral surface from the first starting point.

When the plate material is to be bent in the entire longitudinal direction along a conventional ring-shaped or cylindrical foundation or mold, the bending stress of the entire plate is weak against bending, for example, a knot. Although it concentrates on the surface and causes a break at that location, the overall bending is developed by repeatedly shifting the position while avoiding stress concentration and performing local bending according to the present invention. As a result, it is possible to avoid cracking of the plate material itself and obtain a large curved processed product as a whole. Moreover, the fiber direction is relatively oriented in the longitudinal direction of the strip material 11, and the function as a life with humidity as a green material is maintained, so that the elongation of the fiber can be further exhibited, and the conventional bending process is performed. It has become possible to perform bending processing even for tree species that were difficult to do, and it has become possible to use it in a very wide range of fields.

Here, from a more microscopic point of view, the water content and the fiber saturation point 60 will be described with reference to FIGS. 10 to 11B.

Moisture content is well known to those skilled in the art, and the definition of water content is
Moisture content (%) = (weight before drying-weight after total drying) / weight after total drying x 100
Is.

Wood cells are surrounded by a cell wall. There is a middle lobe M between adjacent cell walls. The cell wall has a primary wall P and a secondary wall S. Therefore, the middle lobe M exists outside the primary wall P and is involved in cell-cell adhesion as an intercellular layer.

The main water content of wood is composed of intracellular free water 66 (intracellular vagina) and bound water 67 inside the cell wall. In drying, it begins to evaporate from the intracellular free water 66. Depending on the change in the amount of free water, the change in intensity is not large and forms a so-called saturated region. On the other hand, the bound water is considered to be secondarily bound to the molecules that make up the wood. Therefore, when the bound water changes, the saturation region is removed from the strength, and the strength also increases according to the change. Change.

FIG. 9 is a graph showing the relationship between the moisture content of wood and the bending strength in order to show the fiber saturation point 60. The water content of wood at the time when the amount of free water changes from the state of having free water 66 in the cell lumen and the free water 66 disappears from the cell lumen is called a fiber saturation point 60. The fiber saturation point 60 corresponds to approximately 30% in terms of the water content. Therefore, as shown in FIG. 9, when the fiber saturation point is 60 or more, that is, the water content is about 30% or more, the longitudinal compressive strength and bending strength of wood are constant and low, and the vertical direction (fiber direction) is also horizontal. It is also soft (in the direction perpendicular to the fiber direction). On the other hand, when the water content is lower than the fiber saturation point 60, the longitudinal compressive strength and the bending strength of the wood increase in a substantially proportional relationship as the content decreases, and the wood has a property of becoming hard in the vertical direction and the horizontal direction.

It should be noted that the relationship between strength and moisture content is well known to those skilled in the art, but the relationship is different from how much wood can be bent.

Conventionally, from the viewpoint of the right material in the right place, for example, the rationality of bending and using broad-leaved wood with relatively high elasticity rather than softwood with relatively low elasticity, and from the viewpoint of quality control technology, for example, excellent softwood. After thoroughly drawing out the twist hidden in the wood by thorough drying, accurate sawing and surface finishing are performed, and then artificial humidification and heating are performed for bending, or boiling is performed to hide inside the wood. It is said that it adopted quality control technology such as boiling the resin (which causes deformation after drying) and then bending it, or shaping technology that utilizes the thermoplasticity of wood under high temperature and high humidity. There was a background, which led to many problems as shown in the technical background of the present invention.

The present invention overcomes today's problems from a biological point of view, such as the toughness of living trees, rather than from the point of view of strength. Raw wood originally has its biological toughness and exhibits sufficient flexibility. In the present invention, a strip material is prepared as a green material so that the fiber direction is relatively oriented toward the longitudinal direction of the strip material so that the bending is effectively exhibited, and the longitudinal direction is deformed. As the direction of travel, while partially holding or supporting with a holder or support such as a one-hand clamp, bending is performed while gradually holding or supporting in the direction of travel, thereby performing a large bending process that has never been seen before. I discovered what I could do.

From the microscopic point of view of cells, this does not cause the force to concentrate on the cell walls between cells inside the wood fiber and the middle lobe that joins the adjacent cell walls, causing cracking or destruction of the plate. In addition, it is thought that the toughness is exhibited by the cell arrangement showing a high amount of deformation such as stretching in the fiber direction while utilizing the allowable stress of the cell wall and the middle lobe.

After being deformed and dried, the final product is obtained by further deforming the fixed cell arrangement showing a high amount of deformation by utilizing its material deformation characteristics. After drying, the allowable stress becomes low as explained above, but since the deformation step, which is the main curvature before application to the final product, has already been performed in advance in step S4, the final Deformation as an intermediate such as bending for application to a product greatly widens the range of use of wood as an intermediate because it is not necessary to apply a large stress. In this way, by adopting a process that combines a new bending method and further bending deformation in stages, it is possible to make a large bending that would cause the wood to crack in the past, thus expanding the variety of products. You can also do it. If necessary, the intermediate body obtained in step S5 is pressed while using a holder or a support such as a one-hand clamp to further deform and bond the intermediate body so as to obtain a desired curvature and the like. May be good.

According to the modified processing method of the present invention, a main curve, usually a rough curve, can be performed in the first deformation process. Therefore, a plurality of strip members are laminated and simultaneously deformed and dried in one deformation process. After that, it is also possible to perform the second fine adjustment processing separately for each sheet. Multiple strips could be used in the same product or in different products.

Again, the shape is memorized in the structure by holding and drying after the deformation process. At this time, it does not have the tough deformability as a raw material as in the conventional case, but it has elastic properties for some deformation. Therefore, not only can it be processed to the extent that it can be elastically deformed into a final product, but also it does not cause burrs due to drying as in the conventional method, so that its use in a final product is greatly promoted. In this way, it was found that further curvature is possible from the shape after drying, and the final curved shape of wood has less deformation and shrinkage in the dry state, so deformation of the finished product is extremely suppressed. It was.

FIG. 6 shows that the strip plate material 11 is bent into a roll shape by using the above-mentioned construction method, and then the strip plate material 11 is slightly stretched in the central axis direction while utilizing the above-mentioned elasticity to form a dish-shaped wooden processed product 13. An example of step S5 to be performed is shown. Another strip member 11 shown in the lower left side of the drawing may be made so as to coincide with the inner diameter D1 of the hole formed in the center of the wooden processed product 13. The other strip member 11 can be used as a base portion of the wooden processed product 13.

For example, the base portion of the base portion 115, which is made of a disk-shaped tree, is also used as a mold, and the strip material 11 is wound around the base portion 115 in a roll shape by the deformation method according to the present invention, and the diameter thereof matches D1. Can be made to do. Then, a product as a dish is formed by connecting the inner diameter of the central hole of the dish-shaped wooden processed product 13 and the base portion having an outer diameter matching the inner diameter to form an integral combination. To.

In this example, the base portion 115 is joined to the bottom portion of the roll-shaped curved strip plate member 11 in accordance with the diameter D1 of the hole in the central portion to complete the container, and the base portion 115 is a disc-shaped center. A roll-shaped curved strip member 11 is wound around the member to a desired thickness. By winding the roll-shaped curved strip plate material 11 around the disk-shaped central member, the roll-shaped portion used as the base portion when the base portion 115 is embedded in the center of the roll-shaped curved strip plate material 11 used as the surface of the plate. The dimensions were adjusted by cutting the outer peripheral tip of the curved strip plate material 11 and the inner peripheral tip of the roll-shaped curved strip plate material 11 used as the surface of the plate with a scissors or the like, and the connection positions of both tips were finely adjusted. It has the feature that it can be connected accurately. However, the disc-shaped wood may be used as it is as the base portion so that it can be connected to the hole in the center of the dish portion.

As a further development of the product, for example, the roll-shaped curved strip 11 which has been dried to the equilibrium moisture content and fixed in shape is further connected and processed to increase or decrease the radius according to the product specifications. Wooden containers can be manufactured by deciding on arbitrary specifications such as the depth and shape of the container.

Further, if necessary, after connecting the roll-shaped curved strip plate material 11, the roll-shaped curved strip plate material 11 is configured while being displaced, so that a wooden container with variations can be easily manufactured. Further, the use of the container manufactured in this manner is not limited to the container, and the shape of the container can be utilized to develop and use it for various purposes.

The curved strip member 11 wound in a roll shape can be produced by various methods within the scope of the present invention. For example, a plurality of band-shaped strips 11 processed and dried in a ring shape are prepared, the ends of the ring-shaped curved strips 11 are butted against each other, and the seal 105 shown in FIG. 5B prevents displacement, and the butt joint method or the like is used. By making the connection, it is possible to make a long-lasting roll-shaped curved strip member 11.

Of course, those skilled in the art who have read this specification will understand that instead of the roll-shaped strip 11 of FIG. 6, the container of FIG. 6 is produced from the spiral strip 11 as shown in FIGS. 4B and 4C. You can do it.

FIG. 7A shows an example 13 in which a plurality of strip members 11 wound in a spiral shape are combined, and FIG. 7B shows a modified example 13 of the combination.

Each of the spiral curved strips 11 can be made by the same process as the spiral strips 11 already described with reference to FIG. 4B. First, the plurality of curved strips 11 are formed for each layer. It is composed of a curved strip member 11 having the winding direction reversed, and is adhesively fixed between the curved strip members 11, whereby a cylindrical plywood 13 made of a plurality of spiral curved strip members is formed. Here, it is preferable that the adjacent curved strips 11 laminated on the upper and lower sides are curved strips having opposite winding directions. By reversing the winding direction for each layer, surface cracking is less likely to occur because the fiber directions are different. Further, the winding direction may be symmetrically provided with a predetermined angle range, for example, an inclination of about 10 degrees in a range of 5 to 15 degrees.

A support 5 as shown in FIG. 4B may be used as it is inside the cylindrical plywood. That is, the strip 11 may be wound around the support 5 which is a part of the actual product. Of course, the support 5 may be used only as a mold, and then the strip 11 may be removed from the support 5 and attached to another support for the original product. The adhesive may be applied to the surface of the support or the inside of the curved strip 11 to be wound, or may be held by the support by hitting a nail or a screw. The support may be filled inside a cylindrical core made of wood, metal, paper, plastic or the like, or a cylindrical plywood 13.

FIG. 7B is a modified example of the combination of FIG. 7A. The difference from FIG. 7A is that in the strip in the central portion of FIG. 7A, the winding direction and the fiber direction of the wood are relatively the same, whereas the strip in the central portion of FIG. 7B (the difference is clear). (Indicated by reference numeral 110) means that the winding direction and the fiber direction are in different directions. The strip-shaped curved body of reference numeral 110 is a strip-shaped single plate of the prior art shown in Non-Patent Document 1. As described above, by combining the curved strip material 11 obtained by the present invention and the curved strip plate material 110 obtained by the conventional method, the cylindrical plywood 13 having increased strength can be constructed.

Next, an example of the processed wooden product obtained by the present invention will be described.

FIG. 8A is an example of applying the curved deformed product obtained by the present invention to a chair.

FIG. 8B shows an example in which an arched dome is formed, and is a sugi with cuts and knots cut into a thickness of 8 mm, a width of 100 mm, and a length of 4000 mm at a water content above the fiber saturation point in the green material after cutting. The strip was arched to fit an arc formwork with a radius of 1270 mm in a cold environment. From this result, it is shown that according to the characteristic extraction method of the present invention, the deformation characteristics of the sugi material can be sufficiently extracted.

The arched strip can be made by assembling and processing a plurality of strips. In this way, for building materials, solid long materials can be used as arch-shaped building structural materials with a smaller radius of curvature than before, such as the dome-shaped roof found in Byzantine architecture and the ceiling found in Gothic style. The arch structure of the columns can be made with coniferous wood such as cedar.

FIG. 8C shows an example in which a strip material wound in a spiral shape is used as an interior material. In particular, a relatively large processed product may be deformed into a strip material wound spirally to some extent in step S4, then dried in step S5, and then accurately bonded.

The strip material is not limited to a ring-shaped concentric circle, and may have an S-shape or a twisted shape, for example, and the width and thickness can be freely set. For example, even if the thickness is generally 5 mm to 10 mm, bending can be performed if the radius of curvature corresponds to the thickness. As a result, depending on the specifications of the product, a strip-shaped material having an arbitrary width and thickness can be deformed, and chairs and other furniture of assembled processed products can be manufactured. Specifically, it can be applied to chairs, sofa side tables, tables, chairs and the like.

In addition to the above, it can be expected to produce curved CLT using sugi wood and cypress wood, which are widely produced in domestic plantations.

The examples disclosed herein are not intended to limit the present invention, but are for illustration purposes only, and such examples do not limit the ideas and scope of the present invention. The scope of the present invention should be construed according to the scope of claims, and all techniques within the equivalent scope should be construed as being included in the scope of rights of the present invention.

10 Plate material cut out from the material 11 Band plate material 12 Protective material 13 Cylindrical plywood 14 Curved band plate material laminate 20 Band saw 30 Tipped saw 60 Fiber saturation point 66 Free water 67 Combined water 105 Seal 110 Band shape obtained by rotary race of the prior art Single plate 115 Disc-shaped plate (also used as a mold)

Claims (5)

It is a method to bring out the biological deformation characteristics of trees in the growing environment without artificial humidification and heating operations .
A strip-shaped board maintained to be usable as a green material after felling and maintained at a water content above the fiber saturation point, for example, 30% or more, and the grain direction is relatively longer than the lateral direction of the board. The strip-shaped plate facing the vehicle is deformed by applying a force that gradually stretches between the fibers of the strip-shaped plate according to the shape of the support while shifting the position along the longitudinal direction. A deformation and holding step of holding the deformed shape of a predetermined intermediate body by holding it in a deformed state with a holding tool.
A drying step of drying the strip-shaped plate to a state of having a water content less than the water content of the fiber saturation point and a predetermined water content or less while maintaining the shape of the intermediate.
A method comprising, after the drying step, releasing the holding state of the intermediate made of the strip-shaped plate and further deforming the strip-shaped plate into a desired shape. The method according to claim 1, wherein the predetermined moisture content is the moisture content in an air-dried state. In the deformation and holding steps
i) Applying force while shifting the position within a predetermined interval along the longitudinal direction.
ii) The pressing speed at the point where the force is applied is less than or equal to the specified speed.
The force is applied under at least one of the above i) and ii) conditions.
Claim 1 that the tree is selected from Ginkgoales Ginkgoales Ginkgoales, Conifers Pinaceae, Araucariaceae, Cupressaceae, Cephalotaxaceae, Cupressaceae, Cephalotaxaceae, Yews. Or the method according to 2. A method for producing a material element in which the deformation characteristics of the plate are brought out by applying any of the methods 1 to 3 . The material element produced by the method according to claim 4 is fixed at least for the overlapping portion of the material element, or is fixed with another member element to maintain a predetermined shape. The production method of the processed products.