JP6031152B2 - Corrugated board manufacturing method - Google Patents

Description

  The present invention relates to a method for manufacturing a corrugated board that is light in weight and excellent in design, and a method for manufacturing an assembly using the corrugated board.

The global warming caused by carbon dioxide and the problem of energy resources have become global problems, but forests play an important role in controlling carbon dioxide. Activity previous human, although the area of the rain forest is estimated that there was approximately 6,000,000,000 ha (= 6x10 ⁷ km ^2), said current becomes approximately 3 billion hectares (= 3x10 ⁷ km ^2), the human economy About half of the rainforest has been lost due to the activities. Similarly, deciduous broad-leaved forests found in Central Europe, eastern North America and East Asia, deciduous coniferous forests that are widely vegetated in Siberia, or evergreen coniferous forests found in mountainous areas of Hokkaido, Hokkaido, etc. There is a tendency to decrease by activity.

  Wood is a material that is easy to process and conveys a unique warmth, and is widely used in the living environment of mankind in various forms such as furniture, tools, and architecture. In other words, timber has been the most familiar and familiar material for humans since ancient times, and has not been found in other materials such as metal, plastic and concrete. It has excellent characteristics such as being difficult to transmit, and having a humidity control action of sucking and discharging moisture.

  On the other hand, recently, wood has been recognized again as a valuable resource for mankind, such as the exercise that does not use disposable chopsticks and the appearance of baseball players who reuse broken bats as disposable chopsticks.

  The present invention reduces the environmental impact by minimizing the use of wood, a valuable resource for humankind, and provides the desired strength with light weight, and is also excellent in design. Another object is to provide a method for manufacturing a corrugated board.

  The first aspect of the present invention includes (a) a step of preparing a wood veneer having a thickness of 0.05 to 5 mm, (b) a step of adding moisture to the wood veneer, and (c) a wood veneer. A step of pressing so as to provide a recess in a part of the wood veneer in a state of containing moisture; and (d) the press is sequentially advanced so that the recess is continuously formed, thereby maintaining the wood veneer. Forming a topology that pulsates in any one direction on a reference plane defined by a vascular direction in which the vascular bundle extends and a vascular bundle orthogonal direction that is perpendicular to the vascular direction; and (e ) After the step of forming the pulsating topology, the gist is that the corrugated board manufacturing method includes a step of sequentially releasing the press along one direction and drying the plate.

  According to the present invention, there is provided a method for manufacturing a corrugated board that reduces environmental burden by minimizing the use of wood resources, is lightweight and has a desired strength, and is excellent in design. be able to.

It is a typical bird's-eye view (perspective view) for demonstrating the schematic structure of the corrugated board which concerns on the 1st Embodiment of this invention. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, Just before sandwiching the thin plate as a material between the base part for a lower surface side shaping | molding of a bending jig, and an upper surface side press part. Show the state. It is a typical bird's-eye view including a partial cross section for demonstrating the press mechanism of the bending jig used for the manufacturing method of the corrugated board which concerns on 1st Embodiment. It is a typical bird's-eye view explaining the outline of the whole view of the bending jig used for the manufacturing method of the corrugated board concerning a 1st embodiment. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, Between the lower surface side shaping | molding base part of a bending jig, and an upper surface side press part after the state shown in FIG. The state which pinched | interposed the thin plate as a material is shown. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and the drive bolt of the left end is dropped after the state shown in FIG. 6, Thereby, it is warm water with respect to the left end of a thin board. Shows the state of starting bending. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and lowers the 2nd drive bolt from the left after the state shown in FIG. 7, thereby, it is 2 from the left end of a thin plate. The state where the bending process progressed in warm water from the left end with respect to the second cycle position is shown. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and lowers the 4th drive bolt from the left after the state shown in FIG. A state in which bending processing proceeds in order in the warm water from the left end with respect to the second cycle position is shown. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and it progresses further after the state shown in FIG. 9, and lowers the i-th drive bolt from the left, Thereby, a thin plate The state where the bending process progressed in order in warm water from the left end with respect to the i-th periodic position from the left end of FIG. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and also progresses after the state shown in FIG. 10, lowers the nth (right end) drive bolt from the left, and this Thus, a state is shown in which bending processing proceeds in order from the left end in warm water with respect to the n-th periodic position from the left end of the thin plate. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and after the completion | finish of the press process shown in FIG. As a result, the removal of the trowel has progressed from the left end of the thin plate to the fourth periodic position. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and the removal step of the stroke shown in FIG. 12 progresses in order from the left, thereby, to the periodic position of the right end of a thin plate. , Shows the state where the removal of the trowel has progressed. It is process drawing explaining the outline of the manufacturing method of the corrugated board which concerns on 1st Embodiment, and the removal process and drying process of the stroke shown in FIG. 13 are complete | finished, From the lower surface side shaping | molding base part of a bending jig The state which pulled up the upper surface side press part is shown. It is a typical bird's-eye view (perspective view) for demonstrating the schematic structure of the corrugated board which concerns on the modification of the 1st Embodiment of this invention. It is a typical bird's-eye view (perspective view) for demonstrating the schematic structure of the corrugated board which concerns on the 3rd Embodiment of this invention. It is typical sectional drawing explaining the outline of one part of the bending jig used for the manufacturing method of the corrugated board which concerns on 3rd Embodiment. It is a typical bird's-eye view (perspective view) for demonstrating the other example of schematic structure of the corrugated board which concerns on the 3rd Embodiment of this invention. It is a typical bird's-eye view (perspective view) for demonstrating the further another example of schematic structure of the corrugated board which concerns on the 3rd Embodiment of this invention. It is a typical bird's-eye view (perspective view) for demonstrating the schematic structure of the assembly using the corrugated board which concerns on other embodiment of this invention. It is a typical bird's-eye view (perspective view) for demonstrating the other example of schematic structure of the assembly using the corrugated board which concerns on other embodiment. It is a typical bird's-eye view (perspective view) for demonstrating the further another example of the schematic structure of the assembly using the corrugated board which concerns on other embodiment. It is a typical bird's-eye view (perspective view) for demonstrating the further another example of the schematic structure of the assembly using the corrugated board which concerns on other embodiment. It is a typical bird's-eye view (perspective view) for demonstrating the further another example of the schematic structure of the assembly using the corrugated board which concerns on other embodiment. As other embodiment, it is a typical side view explaining the outline of the whole view of another bending jig different from the bending jig demonstrated in 1st Embodiment. FIG. 26 is a lateral view illustrating the first and second heat rollers in FIG. 25 in an enlarged manner. FIG. 27 is a schematic lateral view illustrating the method for manufacturing a corrugated board according to another embodiment of the present invention, further enlarging FIG. 26.

  Next, a corrugated board according to first to third embodiments of the present invention and an assembly using the corrugated board will be described by way of example with reference to the drawings. In the description of the drawings referred to in the following description, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic, and the relationship between the thickness and the planar dimensions, the ratio of the thickness of each layer, and the like are different from the actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings. In addition, “upper” and “lower” in the following description and claims are merely selections of orientations for convenience of explanation, and “upper” is replaced with “lower” and “lower” is replaced with “upper”. ”,“ Upper surface ”as“ lower surface ”, and“ lower surface ”as“ upper surface ”, or the direction of stacking and the direction of arrangement can be selected in any oblique direction with respect to the direction of gravity Of course. Furthermore, the following first to third embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is a material of a component. The shape, structure, arrangement, etc. are not specified as follows. The technical idea of the present invention can be variously modified within the technical scope described in the claims.

<< First Embodiment >>
As shown in FIG. 1, the corrugated board 3 according to the first embodiment of the present invention has a pitch between the thicknesses defined by the upper and lower surfaces of a wooden thin plate having a thickness t = 0.05 to 5 mm. It has a shape that pulsates at p1. Although it is possible to reduce the thickness t of the corrugated board 3 according to the first embodiment to about 0.05 mm or less, in consideration of the limitations of the current thin plate processing technology and the strength required as a product, 0. A thickness t of about 05 mm or less is not preferable from an industrial viewpoint. On the other hand, although it is possible to set the thickness t to about 5 mm or more, the thickness t of about 5 mm or more is obtained from the characteristics of the corrugated board manufacturing method according to the first embodiment of the present invention described below. To do this requires an excessive amount of time for processing such as a long time for soaking in water, and also requires energy resources such as electric power during pressing, which is not practical from an industrial point of view. In terms of ease of manufacture, the corrugated board 3 according to the first embodiment preferably has a thickness t = 0.05 to 3 mm, more preferably has a thickness t = 0.05 to 2 mm, and a thickness t = 0.05 to 1.5 mm is more preferable, but the thickness t may be selected in consideration of specifications required as a product.

  The roots of vascular plants such as trees have numerous root hairs that make it easy to absorb water and inorganic nutrients dissolved in water. The absorbed water and inorganic nutrients enter the root canal (transport route) and are transported through the stem canal to leaves, flowers and fruits. Since the leaves have pores, moisture is evaporated from here. By the transpiration of the leaves, the roots can further absorb water and mineral nutrients. The vessel tube (transport route) of this vascular plant is a “vascular tissue”, which consists of a “xylem” and a “sieving part”. The xylem is a passage made of water and mineral nutrients composed of a canal and soft tissue, and the canal is a tissue in which cells are arranged vertically and connected by holes in the cell wall. The sieve part is a passage that conveys organic nutrients made of leaves downward, and consists of a sieve tube and soft tissue. Vascular tissue is a collection of columnar tissues that run vertically in the stems of so-called vascular plants. Normally, they are arranged in a regular arrangement in the stem, branch from there, enter leaves and roots, and end up near the tip. In many vascular plants, these tissues gather together in a certain arrangement to form a bundle-like structure like an assembly of pipes and penetrate the entire vascular plant. There are a plurality of such bundles. If you look at the cross section of the stem, you can see that they are arranged in the vascular plant body in a fixed arrangement. Organs that emerge from the stem such as leaves contain branches of the vascular tissue of the stem, and further branch inside to play a role in material transport and mechanical support of the organ.

  That is, the tissues forming the softwood are temporary conduits, soft tissues, radiation tissues, etc. The temporary conduits are elongated spindles (both ends of the cylindrical shape) at the ends that carry the indication of the tree body and the transportation of water nutrients. It has 90% of the material. There is a difference in the size and wall thickness of the cell vagina of the temporary conduit in the summer wood part and the spring wood part. However, it is not a single long tube and is functionally inferior to a canal. On the other hand, hardwoods have evolved from coniferous trees, and are composed of canals, sapwood fibers, soft tissues, radiation tissues, etc. as the tissues forming the material. The broad-leaved tree canal is used to send moisture and nutrients respired from the root to the upper part. The long and narrow cells are connected in a row, and most of the lateral wall disappears into a long tubular shape, and the cell wall becomes lignified. Masaki fiber has a mechanical action of supporting the tree. The composition ratio of the material occupies 55 to 75%, and the soft tissue of hardwood is more than the softwood, and the arrangement is varied such as those scattered around the canal and long strips. Hardwood radiation tissue is also more numerous than conifers, many more than single row, wide and wide.

  In the corrugated board 3 according to the first embodiment of the present invention shown in FIG. 1, the direction of the temporary conduit of the coniferous material or the direction perpendicular to the direction of the canal of hardwood, that is, “the direction of the vascular tissue” It is a three-dimensional (3D) structure having a topology that pulsates at a pitch p1 in a direction perpendicular to the vertebra and has no change in the direction of the vascular tissue. In FIG. 1, an arcuate (sinusoidal) pulsation shape is disclosed, but this is only an example, and the pulsation shape may be an arcuate shape (sinusoidal wave), a trapezoidal wave shape, a triangular wave shape, or the like. , Trapezoidal, and triangular combinations. In addition, FIG. 1 discloses a shape that pulsates at a pitch p1 in a direction orthogonal to the direction in which the vascular tissue extends (hereinafter referred to as “vascular direction”). It is not always necessary to have a continuously changing shape, and it may be an intermittently changing shape or a combination of an intermittent topology and a periodic topology.

If the discussion is limited to a topology that periodically pulsates at a pitch p1 in the direction orthogonal to the vascular direction (hereinafter referred to as “vascular orthogonal direction”) as shown in FIG. The corrugated board 3 can be arbitrarily designed in consideration of the specifications required as a product in the range of the pitch p1 = 2 to 50 mm. Needless to say, the minimum value of the pitch p1 is determined from geometrical considerations, and the minimum value of the pitch p1 depends on the minimum film thickness t _min . That is, the minimum value of the pitch p1 is theoretically about 4 times or more the minimum film thickness t _{min. In} consideration of the thickness of the air gap, but is usually about 8 times or more the minimum value of the pitch p1. Is necessary, and the pitch p1 is preferably 20 times or more. Therefore, when the lower limit of the thickness t of the corrugated board 3 according to the first embodiment is 0.05 mm, the pitch p1 = 2 mm is a value that is quite close to the geometrically possible limit, but the pitch p1 is If it is about 2 mm or less, the production yield may be reduced. Although there is a problem in strength, if the t _{min. Of the} corrugated board 3 according to the first embodiment is 0.05 mm or less, it is not impossible to make the pitch p1 = 1 mm or less.

  On the other hand, a corrugated board 3b having a pitch p2 larger than the pitch p1 can be adopted as the corrugated board 3b according to the modification of the first embodiment of the present invention, as shown in FIG. For example, a pitch p1 = 6 mm and a pitch p2 = 12 mm can be adopted according to the specifications required for the product, and a topology with a pitch of about 50 mm or more is technically possible. However, the topological features of the corrugated board 3 according to the first embodiment such as a design side surface are thinned. However, if the corrugated boards 3 and 3b have a large thickness t and the specifications required for the product require a topology with a pitch of about 50 mm or more, the pitch may be about 50 mm or more.

  Since the corrugated board 3 according to the first embodiment shown in FIG. 1 and the corrugated board 3b according to the modified example of the first embodiment shown in FIG. 15 are both repeatedly bent in the vascular orthogonal direction, Due to the original nature of the wood and the bellows effect due to the geometric structure of the corrugated boards 3, 3b, the flexibility in the direction perpendicular to the vascular bundle is improved and a flexible plate material is obtained. Therefore, the corrugated board 3 according to the first embodiment and the corrugated board 3b according to the modified example of the first embodiment can exert their advantageous effects by using a plate that vibrates or expands and contracts. It becomes possible.

(Method of manufacturing corrugated board)
The corrugated board manufacturing method according to the first embodiment of the present invention will be described with reference to FIGS. The corrugated board manufacturing method described below is an example, and can be realized by various other manufacturing methods including this modification, as long as it is within the scope of the claims. Of course there is. The raw material of the corrugated board manufacturing method according to the first embodiment may be any of broad-leaved trees such as birch, beech, oak and oak, and conifers such as hiba and cedar. Even if it is a broad-leaved tree or a conifer, wood has the property of being easily bent when it contains moisture and is heated to a high temperature. The corrugated board manufacturing method according to the first embodiment is a technique that uses the elongation due to moisture absorption of the thin plate 3p. The present inventor confirmed that the vascular bundle direction, which is the growth direction of the timber, hardly extends even in water, but that the timber has a property of extending a little less than 10% in the vascular bundle orthogonal direction (width direction).

According to the experiment of the present inventor, as shown in Table 1, with hardwood materials such as birch and beech, the thin plate 3p with t = 0.5 mm peeled timber is 300 mm when dried for 20 minutes or more in water for 30 minutes or more. I got the knowledge that it will grow.

In addition, according to the experiments of the present inventor, as shown in Table 2, the hardwood material is stretched by 15 mm by absorbing moisture for a short time of 30 seconds to 5 minutes, and then returns to the original 300 mm when dried. confirmed.

On the other hand, as shown in Table 3, the thin plate 3p of a coniferous material such as hiba, cedar, etc., with a t = 0.5 mm is not stretched in water or warm water, but the vascular bundle orthogonal direction (width) In the direction), in water and warm water, it was found that 120 mm stretched to 125 mm by 5 mm, and cedar from 150 mm stretched by 3 mm to 153 mm. After drying, it was confirmed that both hiba and cedar wood had returned to their original dimensions.

   As described above, even if it is a broad-leaved tree or a coniferous tree, the thin plate 3p of wood has strength in the vascular direction and little elongation in the vascular direction when moisture is included, but the vascular bundle orthogonal direction (width direction) ) Is easy to bend and deform, so that the thin plate 3p is easily bent, and the thin plate 3p is placed in hot water or steam at a high temperature (80 ° C. or higher depending on the material). The thin plate 3p is easily bent even in about 30 seconds in high-temperature water. In the following, in the corrugated board manufacturing method according to the first embodiment described with reference to FIGS. 2 to 14, the thin plate 3 p is generally bent after being immersed in warm water for about 30 minutes.

In the corrugated board manufacturing method according to the first embodiment, a bending jig matching the width and length of the thin plate 3p as shown in FIGS. As shown in FIGS. 3 to 5, the bending jig used in the corrugated board manufacturing method according to the first embodiment includes a lower surface side molding base 1 and an upper surface side pressing portion 2, and the lower surface side. A thin plate 3p, which is placed in high-temperature hot water or steam steam and is easily bent, is sandwiched between the forming pedestal portion 1 and the upper surface side press portion 2. The lower surface side molding pedestal 1 includes a plurality of roller-shaped lower surface side molding convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j−1 , LD _j , LD _{j + 1} ,. _n and LD _{n + 1} are periodically arranged and fixed at a pitch p1 according to the specification of the product, and a plurality of pedestal beams 11a, 11b, and 11c, and a plurality of legs 12a that support the pedestal beams 11a, 11b, and 11c. , 12b, 12c, 12d. As can be seen from the bird's-eye view of FIG. 5, the plurality of pedestal beams 11a, 11b, and 11c are arranged in parallel to each other and are configured to be orthogonal to the plurality of leg portions 12a, 12b, 12c, and 12d. Incidentally, 3-5, since the convenience described as bending jig used in the production method of the waveform board 3 in the shape of pulsating at a pitch p1 as shown in FIG. 1, the convex portion LD for the lower surface-side molding ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j−1 , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + 1} are illustrated as being periodically arranged at a pitch p1. more generally,, combined with the specifications of the product may, lower surface-side molding protrusion _{LD 0, LD 1, LD 2} , LD 3, ..., LD j-1, LD j, LD j + 1, ..., LD n , LD _{n + 1} are not necessarily arranged periodically. FIG. 3 corresponds to a cross-sectional view taken along the CC plane of the bird's eye view of FIG. 5, and only the pedestal beam 11 c is shown, but on the front side of the paper surface of FIG. 3, the other pedestal beams 11 b and 11 c are They are arranged in parallel to the base beam 11c. Similarly, FIG. 4 corresponds to a bird's-eye view including a cross section taken along the CC plane of the bird's-eye view of FIG. 5, and only the pedestal beam 11c is shown, but other pedestal beams 11b, 11c is arranged in parallel to the base beam 11c. If an arcuate (sinusoidal) pulsating product as shown in FIG. 1 is to be manufactured, the lower surface side forming convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j−1 , LD _{j, LD j + 1, ...} , LD n, at least the upper surface of the LD n + _1, it has an arcuate shape to match the lower surface of the shape of the product (roller-shaped) is a matter of course. FIG. 1 is an example, and if the pulsation shape is a trapezoidal wave shape other than an arc shape, a triangular wave shape, or the like, the lower surface side convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j−1 , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + 1,} of course, at least the upper surface is trapezoidal, triangular, or the like that matches the shape of the lower surface of the product.

As shown in FIGS. 3 to 5, the upper surface side press part 2 also has a plurality of roller-shaped pressing convex parts UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,. , UD _n−1 , UD _n are periodically arranged at a pitch p 1 that matches the product specifications. Further, as shown in FIGS. 3 and 4, the upper surface side pressing portion 2 includes a plurality of pressing convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,. , UD _n−1 , UD _n are fixed to the lower end of each of the connecting movers C ₁ , C ₂ , C ₃ ,..., C _i−1 , C _i , C _{i + 1 ,. 1,} C _n and, connecting the movable element _{C 1, C 2, C 3} , ..., C i-1, C i, C i + 1, ..., respectively C _n-1, C _n, for lower surface side molding drive bolt B _1b driven toward the base portion in one _{direction, B 2b, B 3b, ...} , B (i-1) b, B ib, B (i + 1) b, ..., B (n-1) b , and B _nb, the drive bolt _{B 1b, B 2b, B 3b} , ..., B (i-1) b, B ib, B (i + 1) b, ..., B (n-1) b, the B _nb A bolt fixing beam 22b provided with a female screw for movably storing each of them and a base plate 21b for fixing the bolt fixing beam 22b are provided. Although not shown in FIGS. 3 and 4, as shown in FIG. 5, the drive bolts B _1b , B _2b , B _3b ,..., B _{(i−1) b} , B _ib , B _{(i + 1 ) b, ..., B (n} -1) b, opposite to the B _nb, the drive bolt B _1a is the front side of the sheet of FIG. 3 and FIG. _{4, B 2a, B 3a,} ..., B (i-1 _{) a} , _Bia , B _{(i + 1) a} ,..., B _{(n-1) a} , _Bna are further arranged. As shown in FIG. 5, the bending jig used in the corrugated board manufacturing method according to the first embodiment is driven bolts B _1a , B _2a , B _3a ,..., B _{(i-1) a} , B _ia , B _{(i + 1) a} ,..., B _{(n-1) a} , _Bna are movably accommodated, and a bolt fixing beam 22a having a female screw and a bolt fixing beam 22a are fixed. A base plate 21a is further provided. Incidentally, 3-5, since the convenience described as bending jig used in the production method of the waveform board 3 in the shape of pulsating at a pitch p1 as shown in FIG. 1, the convex portion LD for the lower surface-side molding _{0 , LD 1, LD 2, LD} 3, ..., LD j-1, LD j, LD j + 1, ..., LD n, in the same way as described relative to LD _{n + 1,} the press projection UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,..., UD _n−1 , UD _n are illustrated as being periodically arranged at a pitch p ₁ . in general, the press projection _{UD 1, UD 2, UD 3} , ..., UD i-1, UD i, UD i + 1, ..., the sequence of UD _n-1, UD _n is, combined with the specifications of the product Well, the pressing convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,..., UD _n−1 , UD _n need not necessarily be arranged periodically. Absent.

Lower surface-side molding protrusion _{LD 0, LD 1, LD 2} , LD 3, ..., LD j-1, LD j, LD j + 1, ..., LD n, similarly to the LD _{n + 1,} shown in FIG. 1 If a product having such an arcuate (sinusoidal) pulsation shape is produced, the roller-shaped pressing convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1.} ,..., UD _n−1 , UD _n , of course, have an arcuate shape that matches the shape of the upper surface of the product. Trapezoidal than pulse-shape arc, if the triangular wave, etc., the press projection _{UD 1, UD 2, UD 3} , ..., UD i-1, UD i, UD i + 1, ..., UD n-1 , UD _n may have a trapezoidal wave shape, a triangular wave shape, or the like that matches the shape of the upper surface of the product, or the lower surface side convex portions LD ₀ , LD ₁ , LD ₂ , LD _{3 ,. 1} , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + 1} .

  (A) First, as shown in FIG. 2, using a predetermined blade 51, the wood 31 is sliced into a mesh or a plate (katsuri peel, slicing material), and a thickness t = 0.05 to 5 mm, It is preferably processed into a thin plate 3p having a thickness t = 0.05 to 3 mm, more preferably a thickness t = 0.05 to 2 mm, and still more preferably a thickness t = 0.05 to 1.5 mm.

(B) Then, as shown in FIG. 6, the upper surface side press portion 2 is lowered onto the lower surface side molding base 1 of the bending jig, and the lower surface side molding convex portion LD of the lower surface side molding base 1 is formed. _{0, LD 1, LD 2,} LD 3, ..., LD j-1, LD j, LD j + 1, ..., LD n, LD n + 1 and the press projection UD ₁ of the upper surface pressing portion 2, UD ₂ , UD ₃ ,..., UD _i-1 , UD _i , UD _{i + 1} ,..., UD _n-1 , UD _n are placed in high-temperature hot water or steam steam to make it easy to bend 3p. Between. And the whole bending jig | tool which pinched | interposed the thin plate 3p is immersed in warm water.

(C) After the entire bending jig sandwiching the thin plate 3p is immersed in warm water for about 30 minutes, as shown in FIGS. 7 to 11, the drive bolts B _1b , B _2b , B _3b,. B _{(i-1) b} , B _ib , B _{(i + 1) b} ,..., B _{(n-1) b} , _Bnb are lowered in this order, whereby the connecting movers C ₁ , C ₂ , C _{3, ..., C i-1} , C i, C i + 1, ..., lowers the C _n-1, C _n in order. Connecting movable element _{C 1, C 2, C 3} , ..., C i-1, C i, C i + 1, ..., C n-1, by lowering the C _n in order, the roller-like pressing projection UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,..., UD _n−1 , UD _n are lowered in order, and the thin plate 3p is bent from one side in warm water. Do. 7 to 11 are process diagrams corresponding to a cross-sectional view taken along the CC plane of the bird's-eye view of FIG. 5, and as shown in FIG. 5, drive bolts B _1b , B _2b , B _{3b ,. 1) b, B ib, B} (i + 1) b, ..., B (n-1) b, opposite to the B _nb, the drive bolt _{B 1a, B 2a, B 3a} , ..., B (i-1 _{) a} , B _ia , B _{(i + 1) a} ,..., B _{(n-1) a} , B _na are arranged, so that the drive bolts B _1b , B _2b , B _{3b,. B (i-1) b,} B ib, B (i + 1) b, ..., B (n-1) b, the drive bolt B _1a facing the respective _{B nb, B 2a, B 3a} , ..., B _{(i-1) a, B} ia, B (i + 1) a, ..., B (n-1) a, the B _na, drive bolt _{B 1b, B 2b, B 3b} , ..., B (i-1 _{) b} , B _ib , B _{(i + 1) b} ,..., B _{(n−1) b} , B _nb, and descending in order, thereby connecting movable elements C ₁ , C ₂ , C ₃ ,. , C _i−1 , C _i , C _{i + 1} ,..., C _n−1 , C _n are lowered in order. The connection mover _{C 1, C 2, C 3} , ..., C i-1, C i, C i + 1, ..., by lowering the C _n-1, C _n in order, the roller-like pressing The convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,..., UD _n−1 , UD _n are lowered in order to bend the thin plate 3p from one side. Do. In the following description of FIG. 7-14, the drive bolt _{B 1b, B 2b, B 3b} , ..., B (i-1) b, B ib, B (i + 1) b, ..., B (n-1) The operation will be described focusing on the operation on the _b , _Bnb side, but the drive bolts B _1a , B _2a , B _3a ,..., B _{(i-1) a} , B _ia , B _{(i + 1) a} ,..., B _{(n-1) a} , _Bna are driven bolts _B1b , _B2b , _B3b ,..., B _{(i-1) b} , _Bib , B _{(i +} Note that _{1) b} ,..., B _{(n−1) b} , B _nb are operating in synchronization.

That is, as shown in FIG. 7, the drive bolt B _1b at the left end is first lowered in warm water, thereby lowering the connecting mover C ₁ . By lowering the connecting mover C ₁ , the roller-shaped pressing convex portion UD ₁ is lowered, and the left end of the thin plate 3 p is bent in warm water.

Next, as shown in FIG. 8, in warm water, the second drive bolt B _2b from the left is continuously lowered to the drive bolt B _1b , whereby the connecting mover C ₂ is connected to the connecting mover C _1. Continue to descend. By lowering the connecting mover C ₂ , the roller-shaped pressing convex portion UD ₂ continues to descend to the pressing convex portion UD ₁ , and warm water is moved against the position of the second cycle from the left of the thin plate 3p. Bending with

Next, as shown in FIG. 9, the third drive bolt B _3b from the left is lowered, and the fourth drive bolt B _4b from the left is lowered in order in the warm water. ₄ is lowered following the descent of the connecting mover C ₃ . By continuously lowering the connecting mover C ₄ to the lowering of the connecting mover C ₃ , the roller-like pressing convex portion UD ₄ is continuously lowered to the pressing convex portion UD ₃ , and the fourth from the left of the thin plate 3p. Bending is performed in warm water to the position of the cycle.

Next, as shown in FIG. 10, the (i−1) -th drive bolt B _{(i−1) b} from the left is lowered, and the i-th drive bolt B _ib is sequentially lowered from the left. Subsequent to the lowering of the (i−1) -th connection mover C _i-1 from the left, the connection mover C _i is lowered in order. By subsequently lowering the connection mover C _i to the connecting armature C _i-1 drop on the left side, the left side roller-like pressing projection UD _i in warm water press protrusions UD _i-1 Then, the bending is performed in warm water at the position of the i-th cycle from the left of the thin plate 3p.

Next, as shown in FIG. 11, after the (n−1) th drive bolt B _{(n−1) b} from the left is lowered, the nth drive bolt _Bnb from the left is moved to the left drive bolt B _{( n-1)} is subsequently lowered to drop _b, thereby, subsequently lowering the connection mover C _n to drop the connection mover C _n-1 its left. By subsequently lowering the connection mover C _n to drop the connection mover C _n-1 its left, the roller-like pressing protrusions UD _n descent of the press protrusions UD _n-1 on the left side Then, the bend is performed in the warm water at the position of the nth cycle from the left of the thin plate 3p, that is, the position of the rightmost end. Since the tensile force works when the whole thin plate 3p is bent at the same time, as shown in FIGS. 7 to 11, by bending in order from the left, only a bending force is applied to the material of the thin plate 3p so as not to generate a large tensile force. Can be. 7 to 11, the case where bending is performed in order from the left has been described. However, it is an example, and conversely, bending may be performed in order from the right, or bending may be performed in order from the center. In the corrugated board manufacturing method according to the first embodiment, the material is bent in order from one side or the center, so that a large pulling force is not generated in the material only by the bending force.

(D) Thereafter, as shown in FIGS. 12 to 13, the drive bolts B _1b , B _2b , B _3b ,..., B _{(i−1) b} , B _ib , B _{(i + 1) b} , .., B _{(n-1) b} and _Bnb are raised in order, whereby the connecting movable elements C ₁ , C ₂ , C ₃ ,..., C _i-1 , C _i , C _{i + 1} ,. C _n-1 and C _n are increased in order. Connecting movable element _{C 1, C 2, C 3} , ..., C i-1, C i, C i + 1, ..., by increasing the C _n-1, C _n in order, the roller-like pressing projection part _{UD 1, UD 2, UD 3} , ..., UD i-1, UD i, UD i + 1, ..., a UD _n-1, UD _n, to remove after pressing, necessary amount stroke, the lower surface Lower surface side molding convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j−1 , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + 1} , and the upper surface pressing portion pressing projections UD ₁ of _{2, UD 2, UD 3,} ..., UD i-1, UD i, UD i + 1, ..., between the UD _n-1, UD _n, thin 3p The thin plate 3p is dried in a state of sandwiching. That is, as shown in FIG. 12, the third drive bolt B _3b from the left is raised, and the fourth drive bolt B _4b from the left is raised in order, thereby causing the connection movable element C ₄ to move. raising Following the increase of child C _3. By continuously raising the connecting mover C _{4 following} the rise of the connecting mover C ₃ , the roller-like pressing convex portion UD ₄ is continuously raised to the pressing convex portion UD _3, and after pressing the thin plate 3 p Remove only the required amount of strokes.

Further, as shown in FIG. 13, the (n-1) th drive bolt B _{(n-1) b} from the left rises, and the nth drive bolt _Bnb from the left is driven to the left in warm water. increase of the bolt B _{(n-1) b} continue raised to, thereby, subsequently increasing the connection mover C _n to the increase in the connection mover C _n-1 its left. By subsequently raising the connection mover C _n to the increase in the connection mover C _n-1 its left, increasing the roller-shaped press protrusion UD _n of the press protrusions UD _n-1 on the left side Then, after pressing the thin plate 3p, the stroke is removed by a necessary amount in warm water, and the lower surface side forming convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j-1 , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + 1} and pressing convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,. while sandwiching the sheet 3p between the _n-1, UD _n, drying the sheet 3p. Thus, after completion of the bending process in the hot water at the positions of all the cycles as shown in FIG. 11, the pressing convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i-1 , UD _i , UD _{i + 1} ,..., UD _n-1 , UD _n are slightly returned in warm water to give a degree of freedom for the material of the thin plate 3p to shrink by drying. As shown in FIGS. 12 to 13, by removing a stroke by a necessary amount after pressing, the material of the thin plate 3p is given a degree of freedom to shrink by drying. Roughness of the surface of the thin plate 3p can be prevented. However, if the load is released too much in the steps shown in FIGS. 12 to 13, the material becomes unnatural when the thin plate 3 p is dried, and the distortion after processing becomes large.

(E) Then, the entire bending jig sandwiching the thin plate 3p is drawn out from the hot water, and the drying process is started. The drying process may be natural drying or forced drying, but it is necessary to select an optimal release of the stroke in accordance with the drying process. After the thin plate 3p is dried, the upper surface side press portion 2 is raised from the upper surface side of the lower surface side molding pedestal portion 1, and the lower surface side molding pedestal portion 1 and the upper surface side press portion 2 are separated as shown in FIG. Let As shown in FIG. 14, when the upper surface side press portion 2 is separated from the lower surface side molding pedestal portion 1, the lower surface side molding convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ , .., LD _j−1 , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + 1} are completed, and the waveform board 3 according to the first embodiment is completed.

A tensile force is forcibly applied to the surface of the thin plate 3p at the time of bending, but the tensile force can be released by the stroke removal process shown in FIGS. The surface roughness of the corrugated board 3 according to the embodiment can be eliminated.

Table 4 is a bottom-side molding protrusion _{LD 0, LD 1, LD 2} , LD 3, ..., LD j-1, LD j, LD j + 1, ..., LD n, LD n + 1 and, for press When the convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i-1 , UD _i , UD _{i + 1} ,..., UD _n-1 , UD _n are each 6 mm in diameter and continuously bent underwater with a 1 mm gap. However, when the stroke is returned 2mm in water after bending, partial small cracks in the vascular direction are observed, but after bending, When the stroke is returned by 3 mm, cracks are not recognized, but the deformation after drying is large. On the other hand, after bending, the stroke was returned by 2 mm in water and then put out into the air. After 10 minutes, when the stroke was further returned by 1 mm, it was confirmed that neither cracking nor deformation occurred.

On the other hand, the convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j−1 , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + 1} and the pressing convex portion UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,..., UD _n−1 , UD _n each have a diameter of 12 mm, and the thin plate 3p is immersed in water at 90 ° C. for 30 minutes or more. When immersed, continuously bent in high-temperature water with a gap of 1 mm, and then naturally dried in room temperature and air, after bending, many large cracks in the vascular direction were observed when there was no stroke return. . However, after bending, when the stroke was largely returned and the member (iron column) used for bending was held under its own weight, the result was that there was no cracking or deformation.

  In the stroke removal process shown in FIGS. 12 to 13, in addition to the effect of eliminating the surface roughness (small surface cracks) of the corrugated board 3, the thin plate 3 p absorbs moisture during bending. Although the elongation in the direction perpendicular to the vascular bundle (width direction) is less than 10%, there is an effect that it is possible to give a degree of freedom to return the thin plate 3p to the original state by releasing the machining stroke. By giving the degree of freedom that the elongation in the vascular bundle orthogonal direction (width direction) returns to the original, the occurrence of cracks in the thin plate 3p can be suppressed. That is, when the thin plate 3p is continuously bent along the vascular bundle orthogonal direction as described with reference to FIG. 1, the thin plate 3p extends in the vascular bundle orthogonal direction (width direction) in warm water. Since the thin plate 3p can be given a degree of freedom to return to its original length, a large deformation can be processed continuously.

  In the stroke removal process shown in FIGS. 12 to 13, if the stroke is returned too much, the bent thin plate 3 p (corrugated board 3 according to the first embodiment as a finished product) is distorted as a whole. As shown in Table 4, the method of releasing the bending stroke is preferably to return the minimum stroke so that the deformation after the machining is minimized. It is possible to control the amount to be returned once or in time, and it is also possible to use a method of applying a constant tension by a constant load (self-weight of workpiece or spring) after bending the thin plate 3p. It is.

  The series of steps from the press to the removal of the stroke and drying described with reference to FIGS. 6 to 14 can be variously modified, and the series of steps from the press to the removal and drying is automatically controlled by computer control. A system may be configured. If the shape is a special shape, a part of the series of steps from pressing to removal and drying may be performed manually. Moreover, the bending jigs shown in FIGS. 4 and 5 are examples, and bending jigs having various structures and sizes can be employed.

  In the above description, in the case where most of the series of steps from the press of FIGS. 6 to 14 to the removal of the stroke are carried out with the entire bending jig illustrated in FIGS. 4 and 5 immersed in warm water. However, the corrugated board manufacturing method according to the first embodiment is limited to the case where the entire bending jig is immersed in warm water. Should not be construed. That is, in the corrugated board manufacturing method according to the first embodiment, for example, as described with reference to FIGS. This includes a modification in which the entire bending jig is placed in steam or in a high-humidity atmosphere near the saturated vapor pressure.

Alternatively, the entire bending jig is placed in the air, steam is sprayed from below or above the bending jig, and the thin plate 3p is steamed with water vapor, as described with reference to FIGS. A part or all of a series of steps leading to the pressing and subsequent stroke removal may be performed on the thin plate 3p. In this case, the entire bending jig may be heated and controlled so as to have substantially the same temperature as the steam, and the pressing by an iron press and the subsequent stroke may be removed. Further, at least the lower surface side forming convex portions LD ₀ , LD ₁ , LD ₂ , LD ₃ ,..., LD _j−1 , LD _j , LD _{j + 1} ,..., LD _n , LD _{n + of} the bending jig. ₁ and pressing convex portions UD ₁ , UD ₂ , UD ₃ ,..., UD _i−1 , UD _i , UD _{i + 1} ,..., UD _n−1 , UD _n are close to the same temperature as steam. In a state where the heating is controlled to a predetermined temperature, a part or all of the steps of pressing with an iron press and subsequent stroke removal may be performed. Therefore, the step of removing the stroke may include at least a part of performing a step of spraying steam from below or above the thin plate 3p and steaming the thin plate 3p with water vapor.

<< Second Embodiment >>
The corrugated board 3 according to the first embodiment shown in FIG. 1 and the corrugated board 3b according to the modification of the first embodiment shown in FIG. 15 are the original properties of wood and the geometry of the corrugated boards 3 and 3b. Due to the bellows effect due to the mechanical structure, the flexibility in the direction perpendicular to the vascular bundle was improved, and it had the characteristic of becoming a flexible plate material. However, it was continuously along the direction perpendicular to the vascular bundle described in FIG. 1 and FIG. The bending topology is an example, and a topology in which bending is continuously performed along the vascular direction is also possible. That is, the corrugated board of the present invention is made of wood, on a reference plane defined by a vascular direction in which the vascular bundle of the wood extends and a vascular bundle orthogonal direction that is perpendicular to the vascular direction. Therefore, the arbitrary one direction selected is the waveform board 3 according to the first embodiment and the waveform according to the modification of the first embodiment. The board 3b may be in the vascular bundle orthogonal direction, or may be in the vascular bundle direction as in the corrugated board according to the second embodiment.

  Wood is strong in bending in the vascular direction and weak in bending in the direction perpendicular to the vascular bundle because the fibers grow in the vascular direction. The corrugated board according to the second embodiment of the present invention can increase the strength in the orthogonal direction of the vascular bundle by adopting a topology that bends continuously along the vascular direction. Therefore, according to the corrugated board which concerns on 2nd Embodiment, there can exist an advantageous effect that it can be set as a thinner and lighter member.

   For example, a thin and lightweight corrugated board can be realized by using a birch material and continuously bending along the vascular direction, returning the stroke by 2 mm, and then returning the stroke by 1 mm after 10 minutes. It has been confirmed. In the case of bending continuously along the vascular direction, it is easy to deform after processing because of the fiber.

  In the case of adopting a topology that bends continuously along the vascular direction of the corrugated board according to the second embodiment, since it extends in warm water in the direction perpendicular to the vascular bundle of the thin plate 3p, the tensile force is increased in the drying process. Therefore, it is preferable to release the stroke larger than the amount of shrinkage caused by drying of the material, rather than continuously bending in the direction perpendicular to the vascular bundle.

<< Third Embodiment >>
In the corrugated board 3 according to the first embodiment of the present invention shown in FIG. 1 and the corrugated board 3b according to the modification of the first embodiment shown in FIG. 15, an arcuate (sinusoidal) pulsating shape is illustrated. However, as already described, the pulsation shape may be a trapezoidal wave shape, a triangular wave shape, or the like in addition to an arc shape, or may be a combined shape of an arc shape, a trapezoid shape, or a triangle shape. As another example, the corrugated board 3c according to the third embodiment of the present invention shown in FIG. 16 has a shape that pulsates in a rectangular wave shape at a pitch p3 in the direction perpendicular to the vascular bundle direction.

In the case of a rectangular wave topology that periodically pulsates at a pitch p3 in the direction perpendicular to the vascular bundle direction as shown in FIG. 16, similarly to the corrugated board 3 according to the first embodiment, the pitch p3 = 2 to 50 mm. It can be arbitrarily designed in consideration of the specifications required as a product within a range. However, for the convenience of processing a thin plate of wood, there is a corner portion of R = 1 to 2 mm in the bent portion of the rectangular wave. The R value of the bent portion of the rectangular wave depends on the minimum film thickness t _{min. Of the} corrugated board 3c. That is, the minimum value of the pitch p3 is about 2 to 3 times the minimum film thickness t _min . Usually, the R value of the bent portion of the rectangular wave needs to be about 5 times the minimum value of the pitch p3 or more.

The corrugated board 3c according to the third embodiment can be manufactured by using a bending jig as shown in FIG. 17 similar to that used in the corrugated board manufacturing method according to the first embodiment. it can. That is, the bending jig used in the method for manufacturing the corrugated board according to the third embodiment includes the lower surface side molding base 1 and the upper surface side pressing portion 2, and the lower surface side molding base 1b, A thin plate 3cp that is placed in high-temperature hot water or steam vapor to be easily bent is sandwiched between the upper surface side press portion 2b. The lower surface side molding pedestal portion 1b has a plurality of roller-shaped lower surface side molding convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b,. And a plurality of pedestal beams 11cb,... Periodically arranged and fixed at a pitch p3, and a plurality of leg portions 12ab, 12bb,. As estimated from the bird's-eye view of FIG. 5, the plurality of pedestal beams 11cb,... Are arranged in parallel to each other and are orthogonal to the plurality of leg portions 12ab, 12bb,. The other pedestal beams 11bb and 11cb are arranged in parallel to the pedestal beam 11cb on the front side of the paper surface of FIG. In the third embodiment, a rectangular pulsation-shaped product as shown in FIG. 16 is manufactured. Therefore, the lower surface side convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD Of course, at least the upper surface of _7b ,... _Has a rectangular shape (roller shape) that matches the shape of the lower surface of the product. Note that FIG. 17 is conveniently described as a bending jig used in the method of manufacturing the corrugated board 3c having a pulsating shape with the pitch p3 shown in FIG. 16, and therefore the lower surface side forming convex portions LD _1b and LD. _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b ,... Are periodically arranged at a pitch p3. The convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b ,... _Are not necessarily arranged periodically.

As shown in FIG. 17, the upper surface side press portion 2b also has a plurality of roller-shaped press convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b,. Are periodically arranged at a pitch p3 in accordance with. Further, as shown in FIG. 17, the upper surface side press portion 2b includes a plurality of pressing convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b,. The connecting movers C _1b , C _2b , C _3b , C _4b , C _5b , C _6b , C _7b ,..., And the connecting movers C _1b , C _2b , C _3b , C _4b , C _5b,. Drive bolts B _1bb , B _2bb , B _3bb , B _4bb , B _5bb , B _6bb , B _7bb ,... _That drive C _6b , C _{7b ,.} Bolts B _1bb , B _2bb , B _3bb , B _4bb , B _5bb , B _6bb , B _7bb ,... And a base plate for fixing the bolt fixing beam 22bb. 21bb is provided. Although not shown in FIG. 17, as shown in FIG. 5, the drive bolts B _1bb , B _2bb , B _3bb , B _4bb , B _5bb , B _6bb , B _7bb,. Of course, drive bolts B _1ba , B _2ba , B _3ba , B _4ba , B _5ba , B _6ba , B _7ba ,... _Are further arranged on the front side of the _sheet . In order to manufacture a rectangular pulsating product as shown in FIG. 16, like the lower surface side convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b,. , At least the lower surface of the pressing convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b ,... _Has a rectangular shape that matches the shape of the upper surface of the product. Note that FIG. 17 is conveniently described as a bending jig used in the method of manufacturing the corrugated board 3c having a pulsating shape with the pitch p3 shown in FIG. 16, so that the pressing convex portions UD _1b , UD _2b , The case where UD _3b , UD _4b , UD _5b , UD _6b , UD _7b ,... Are periodically arranged at a pitch p3 is illustrated, but more generally, it is sufficient to match the product specifications. UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b ,... Do not necessarily have to be periodically arranged, because the lower surface side forming convex portions LD _1b , LD _2b , LD _{The same as 3b} , _LD4b , _LD5b , _LD6b , _LD7b ,... In FIG. 17, the lower surface side forming convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b ,... And pressing convex portions UD _1b , UD _2b , UD _3b , UD _4b. , UD _5b , UD _6b , UD _7b ,... Are shown as if they were at right angles, but they are schematic representations for convenience, and actually match the product specifications. Of course, each corner is provided with a necessary R part.

The corrugated board manufacturing method according to the third embodiment of the present invention is similar to the corrugated board manufacturing method according to the first embodiment already described with reference to FIGS. It is a technique that has the property of being easily bent when it is contained and made hot, and that utilizes elongation due to moisture absorption of the thin plate 3cp. That is, first, as shown in FIG. 17, the upper surface side press portion 2b is lowered on the lower surface side molding pedestal portion 1b, and the lower surface side molding convex portions LD _1b , LD _2b , LD of the lower surface side molding pedestal portion 1b. _3b , _LD4b , _LD5b , _LD6b , _LD7b ,..., And pressing convex portions _UD1b , _UD2b , _UD3b , _UD4b , _UD5b , _UD6b , UD7b _,. In between, a thin plate 3 cp placed in high-temperature hot water or steam and made easy to bend is sandwiched. Thereafter, as shown in FIGS. 7 to 11 in the first embodiment, the drive bolts B _1bb , B _2bb , B _3bb , B _4bb , B _5bb , B _6bb , B _7bb,. As a result, the connecting movers C _1b , C _2b , C _3b , C _4b , C _5b , C _6b , C _7b,. ... By sequentially lowering the connecting movers C _1b , C _2b , C _3b , C _4b , C _5b , C _6b , C _7b ,..., The pressing convex portions UD _1b , UD _2b , UD _3b whose bottom surface is rectangular. , UD _4b , UD _5b , UD _6b and UD _7b are lowered in order, and the thin plate 3cp is bent from one side. Then, the connecting movable elements C _1b , C _2b , C _3b , C _4b , C _5b , C _6b , C _7b ,... _Are sequentially lowered to press the pressing convex portions UD _1b , UD _2b,. UD _3b , UD _4b , UD _5b , UD _6b and UD _7b are lowered in order, and the thin plate 3cp is bent from one side.

That is, although not shown, as in the case shown in FIG. 7, the leftmost drive bolt B _1bb is first lowered, and thereby the connecting movable element C _1b is lowered. By lowering the connecting mover C _1b , the pressing convex portion UD _1b whose lower surface is rectangular is lowered, and the left end of the thin plate 3cp is bent. Further, the process of lowering from the left proceeds in sequence, and as shown in FIG. 17, the third drive bolt B _3bb from the left is lowered and the fourth drive bolt B _4bb from the left is lowered in order. Then, the connecting mover C _4b is lowered following the lowering of the connecting mover C _3b . By continuously lowering the connecting mover C _{4b following} the lowering of the connecting mover C _3b , the pressing convex portion UD _4b whose bottom surface is rectangular is continuously lowered to the pressing convex portion UD _3b, and from the left of the thin plate 3cp. Bending is performed on the position of the fourth period.

Although not shown, the process of further descending from the left proceeds in order, and the lowering of the (n−1) th drive bolt B _{(n−1) bb} from the left is performed in the same manner as shown in FIG. After that, the n-th driving bolt B _nbb from the left is continuously lowered to the lowering of the left driving bolt B _{(n-1) bb} , whereby the connecting movable element C _nb is moved to the left connecting movable element C. _{(n-1) Decrease following b} . By lowering the connecting movable element C _{nb following} the lowering of the left connecting movable element C _{(n−1) b} , the roller-shaped pressing convex part UD _{nb is changed} to the left pressing convex part UD _{(n -1) Next to} the descent of _b, the descent is performed on the position of the nth cycle from the left of the thin plate 3p, that is, the rightmost position. In this way, by bending in order from the left, it is possible to prevent a large tensile force from being generated only by a bending force in the material of the thin plate 3cp.

Thereafter, although not shown, the drive bolts B _1bb , B _2bb , B _3bb ,..., B _{(i−1) bb} , B _ibb , B _{(i +} are similar to those shown in FIGS. _{1) bb, ..., B (} n-1) bb, increasing the B _NBB sequentially, thereby connecting the movable element _{C 1b, C 2b, C 3b} , ..., C (i-1b) b, C ib, C _{(i + 1b) b} ,..., C _{(n-1b) b} , _Cnb are raised in order. Connecting the mover _{C 1b, C 2b, C 3b} , ..., C (i-1b) b, C ib, C (i + 1b) b, ..., raising C _(n-1b) b, a C _nb sequentially it makes pressing projection UD _1b of the lower surface is _{rectangular, UD 2b, UD 3b, ...} , UD (i-1b) b, UD i, UD (i + 1b) b, ..., UD (n-1b) _b , _UDnb , after pressing, the stroke is removed by a necessary amount, and the lower surface side molding convex portions LD ₀ , LD _1b , LD _2b , LD _3b ,..., LD _j-1b of the lower surface side molding base 1 , LD _j , LD _{j + 1b} ,..., LD _nb , LD _{nb + 1b,} and pressing convex portions UD _1b , UD _2b , UD _3b ,... UD _{(i−1b) b} , UD of the upper surface side press portion 2. _{i, UD (i + 1b)} b, ..., UD (n-1b) b, between the UD _nb, while sandwiching the sheet 3 cp, drying the sheet 3 cp. Thus, after completion of the bending process at the positions of all the cycles, the pressing convex portions UD _1b , UD _2b , UD _3b ,..., UD _{(i-1b) b} , UD _i , UD _{(i + 1b) b} , ..., UD _{(n-1b) b} , UD _nb stroke (push-in) is slightly returned to give the freedom to shrink the material of the thin plate 3cp by drying, and cracks and thin plates due to the contraction of the thin plate 3cp when the thin plate 3cp is dried By preventing the surface roughness of 3cp, the corrugated board 3c according to the third embodiment is completed.

  FIG. 1 discloses an arcuate (sinusoidal) pulsation shape, and FIG. 16 discloses a rectangular wave pulsation shape, but these are only examples, and the pulsation shape is as shown in FIG. A trapezoidal wave shape, a triangular wave shape as shown in FIG. FIG. 18 illustrates a waveform board 3d having a trapezoidal wave topology that periodically pulsates at a pitch p4 in the vascular orthogonal direction, and FIG. 19 illustrates a triangular wave topology waveform periodically pulsating at a pitch p5 in the vascular orthogonal direction. Although the corrugated board 3e is illustrated, the pitches p3, p4, and p5 can be arbitrarily designed in consideration of specifications required as products, and have a continuous shape that periodically changes at a constant pitch. Is not necessarily required, and may be an intermittently changing shape or a combination of an intermittent topology and a periodic topology.

  Similarly to the corrugated board according to the second embodiment, the corrugated board according to the third embodiment has the rectangular wave shape of FIG. 16, the trapezoidal wave shape of FIG. 18, the triangular wave shape of FIG. However, by adopting a topology that bends continuously along the vascular bundle direction, the strength can be increased in the vascular bundle orthogonal direction, and an advantageous effect that a thinner and lighter member can be obtained.

Further, in the case of the corrugated board 3d having a trapezoidal wave topology periodically pulsating at a pitch p4 in the vascular bundle orthogonal direction as shown in FIG. 18, the lower surface side forming convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b ,... Are trapezoidal shapes that match the shape of the lower surface of the product, and press convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b. , UD _6b , UD _7b ,... _May have a trapezoidal shape that matches the shape of the upper surface of the product. Similarly, in the case of a corrugated board 3e having a triangular wave topology that periodically pulsates at a pitch p5 in the direction perpendicular to the vascular bundle as shown in FIG. 19, the lower surface side forming convex portions LD _1b , LD _2b , LD _3b , LD _At least the upper surface of _4b , _LD5b , _LD6b , _LD7b ,... _Has a triangular shape that matches the shape of the lower surface of the product, and press convex portions _UD1b , _UD2b , _UD3b , _UD4b , _UD5b , UD _{It is sufficient} that at least the lower surface of _6b , _UD7b ,... _Has a triangular shape that matches the shape of the upper surface of the product. More generally, the lower surface side forming convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b ,..., And press convex portions UD _1b , UD _2b , UD _3b. , UD _4b , UD _5b , UD _6b , UD _7b ,... Only need to match the product specifications, so that the lower surface side convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b ,..., And pressing convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b,. , Not always necessary. Further, the shape of the upper surface of the lower surface side forming convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b ,..., And the pressing convex portions UD _1b , UD _2b , UD _3b , UD The shape of the lower surface of _4b , _UD5b , _UD6b , _UD7b ,... Suffices to match the product specifications, so that the lower surface side molding convex portions _LD1b , _LD2b , _LD3b , _LD4b , _LD5b , _LD6b , LD _7b ,... _Are not necessarily the same in shape, and similarly, pressing convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b,. It is not always necessary that the shape of the lower surface of each is the same. For example, according to the specifications of the product, the shape of the upper surface of the convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b,. Repeatedly, the shape of the lower surface of the pressing convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b ,... Can be arranged to repeat a trapezoidal shape and a triangular shape. Depending on the specifications of the product, the upper surface of the convex portions LD _1b , LD _2b , LD _3b , LD _4b , LD _5b , LD _6b , LD _7b,. There may be an arrangement in which the shape of the bottom surface of the convex portions UD _1b , UD _2b , UD _3b , UD _4b , UD _5b , UD _6b , UD _7b ,... _Repeats an arc shape and a rectangular shape.

(Other embodiments)
As described above, the present invention has been described according to the first to third embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

For example, since the definitions of “upper” and “lower” in the present invention are merely directional choices, “upper” may be replaced with “lower” and “lower” may be “upper” as already described. However, in the configuration of the bending jig shown in FIGS. 3 to 5 and FIG. 17, the functions of the “lower surface side pedestal portion 1” and the “upper surface side press portion 2” are interchanged to obtain a thickness. You may make it the structure which presses the thin plate about t = 0.05-5 mm from the lower surface side. In this case, in order to press the thin plate from below, a plurality of pressing projections are arranged on the lower surface side in accordance with the product specifications, and the plurality of pressing projections are connected for fixing each to the upper end. The mover and the drive bolt for driving the connecting mover upward are also provided so as to be movable on the lower surface side, and a plurality of roller-shaped upper molding protrusions are provided on the upper surface side. Needless to say, the portions may be arranged and fixed according to the specifications of the product.

Furthermore, in the configuration of the bending jig shown in FIGS. 3 to 5 and FIG. 17, a thin plate having a thickness of t = 0.05 to 5 mm is pressed from both the upper surface side of the thin plate and the lower surface side of the thin plate. Any configuration may be used.

Furthermore, in the description of the first to third embodiments already described, in FIG. 1, an arc-shaped (sinusoidal) waveform board 3 that periodically pulsates at a pitch p <b> 1 in the vascular orthogonal direction is illustrated in FIG. 15. In FIG. 16, an arc-shaped (sinusoidal) corrugated board 3b that periodically pulsates at a pitch 2 (p1 <p2) in the vascular orthogonal direction is shown in FIG. In FIG. 18, the corrugated board 3c has a trapezoidal waveform board 3d that periodically pulsates at a pitch p4 in the vascular orthogonal direction, and FIG. 19 has a triangular wave shape that pulsates periodically at a pitch p5 in the vascular orthogonal direction. Each of the corrugated boards 3e is illustrated, but in these examples, the case where the direction of the curvature structure line and the bent line indicating the valley line and the ridge line characterizing the waveform shape is the vascular bundle direction is illustrated. However, as is apparent from the description of the second embodiment, the direction of the valley line, the ridge line, the bent line and the like need not be limited to the direction parallel to the vascular direction, and is 90% with respect to the vascular bundle orthogonal direction. It may have a pulsation shape that has an inclination angle in an oblique direction other than 0 ° and proceeds in the vascular bundle orthogonal direction. That is, the corrugated board of the present invention is made of wood, on a reference plane defined by a vascular direction in which the vascular bundle of the wood extends and a vascular bundle orthogonal direction that is perpendicular to the vascular direction. It is only necessary to have a topology that pulsates in any one direction selected for the pulsation direction, and any one direction selected as the pulsation direction may be a vascular orthogonal direction, a vascular direction, or a vascular direction. It may be an oblique direction different from both the tube bundle direction and the vascular bundle orthogonal direction. Furthermore, a topology in which any one direction selected on the reference plane as the pulsation direction is changed midway may be used. Therefore, for example, when focusing on the direction of the valley line, ridge line, bent line, etc., the inclination angle with respect to the vascular orthogonal direction such as the valley line, ridge line, bent line, etc. The topology may be changed.

  Further, the top and bottom surfaces that define the amplitude of the pulsation of the corrugated boards 3, 3b, 3c, 3d, and 3e do not have to be horizontal planes, and may have a topology in which the top and bottom surfaces that define the amplitude greatly swell in parallel. Alternatively, the top surface and the bottom surface that define the amplitude may be greatly bent in parallel to form a ring, square curvature, or loop topology as a whole. Further, a topology in which the distance between the upper surface and the lower surface defining the amplitude of the pulsating wave is not constant and the amplitude of the pulsation changes may be used.

  Furthermore, as shown in FIG. 20, a flat plate-like upper thin plate 33a is provided at the position of the upper surface that defines the amplitude of pulsation of the corrugated board 3 described in the first embodiment, and a flat plate-like lower thin plate 33b is provided at the lower surface. The corrugated board 3 as an intermediate web is sandwiched between the flat upper surface thin plate 33a and the flat lower surface thin plate 33b, and the corrugated board 3 and the upper thin plate 33a are bonded together with an adhesive. By constructing an assembly in which 33b is bonded with an adhesive, it is possible to construct a building member or packaging member that is lightweight and strong. Although not shown, similarly, the waveform boards 3b, 3c, 3e described in the modification of the first embodiment and the waveform boards 3c, 3d, 3e described in the third embodiment are also described. A flat upper surface thin plate 33a is provided at the position of the upper surface that defines the amplitude of the pulsation of 3d and 3e, a flat lower surface thin plate 33b is provided at the lower surface position, and the flat upper surface thin plate 33a and the flat lower surface thin plate 33b are provided. Then, the corrugated boards 3b, 3c, 3d, 3e are sandwiched, the corrugated boards 3b, 3c, 3d, 3e and the upper thin plate 33a are bonded with an adhesive, and the corrugated boards 3b, 3c, 3d, 3e and the lower thin plate 33b are bonded. By constructing an assembly bonded with an adhesive, it is possible to construct a building member or packaging member that is lightweight and strong. Similarly, a flat plate-shaped upper thin plate 33a is provided at the position of the upper surface that defines the amplitude of the pulsation of the corrugated board of the second embodiment, a flat plate-shaped lower thin plate 33b is provided at the position of the lower surface, and the flat plate-shaped upper thin plate 33a. Between the corrugated board of the second embodiment and the corrugated board of the second embodiment, and the corrugated board of the second embodiment and the upper thin plate 33a with an adhesive. If the assembly which adhere | attached the lower surface thin plate 33b with the adhesive agent is comprised, it is possible to comprise the structural member and packaging member which are lightweight and strong. Further, these assemblies may be stacked to form a larger assembly.

  Furthermore, as shown in FIG. 21, by attaching a polymer thin film 35a such as a resin of thickness t1 to the upper surface of the corrugated board 3 of thickness t2 described in the first embodiment using an adhesive or the like, Strength can be given. In addition, a polymer thin film 35a having a thickness t1 is bonded to the upper surface of the corrugated board 3 shown in FIG. 21, and a polymer thin film 35b having a thickness t3 is further adhered to the lower surface of the corrugated board 3 using an adhesive or the like. By bonding together, the three-layer structure can be further strengthened. Although not shown, similarly, the waveform boards 3c, 3d, 3e described in the modification of the first embodiment and the waveform boards 3c, 3d, 3e described in the third embodiment are also described. By attaching the polymer thin film 35a having a thickness t1 to the upper surface of each of 3e, the strength can be given. Further, by attaching a polymer thin film 35b such as a resin having a thickness t3 to the lower surface of the corrugated boards 3c, 3d, 3e, a three-layer structure can be given further strength. Similarly, for the corrugated board of the second embodiment, the polymer thin film 35a having a thickness t1 is bonded to the upper surface of the corrugated board of the second embodiment, or the lower surface of the corrugated board of the second embodiment. By attaching the polymer thin film 35b having a thickness t3 to form a three-layer structure, it is possible to provide strength.

  Furthermore, although not shown, in the structure shown in FIG. 21, a structure in which the corrugated board 3 of the first embodiment having the same shape and the same pitch is used and bonded with an adhesive instead of the polymer thin film 35a. But it ’s okay. In other words, the corrugated board 3 of the first embodiment having the same shape and the same pitch is bonded to the upper surface of the corrugated board 3 of the first embodiment, so that the two-layer structure can provide strength. The first wood defined by a vascular direction that is a direction in which the vascular bundle of the first timber extends and a vascular bundle orthogonal direction that is perpendicular to the vascular direction. A first corrugated board having a topology pulsating in one direction on the reference plane and a second wood, in a direction perpendicular to the vascular bundle direction of the second wood and the vascular bundle direction of the second wood. A second corrugated board having a topology that pulsates in one direction on a second reference plane defined by a certain vascular orthogonal direction; May be the same type of wood or different types of wood. For example, the first wood may be a hardwood and the second wood may be a conifer. By bonding the corrugated board 3 of the first embodiment having the same shape and the same pitch to the lower surface of the board 3, the three-layer structure can be given further strength, and the multi-layer having a four-layer structure or more can be provided. The structure can achieve a desired plate thickness, and can have sufficient strength as a thick plate material. In such a multi-layered structure, the corrugated board materials stacked in each other may be composed of the same kind of wood, and at least one layer of corrugated board material may be the other material. Corrugated board material of layers may be laminated with different types of wood, and all layers of corrugated board material are configured to be laminated with different types of wood from other layers of corrugated board material May be. Similarly, the corrugated board 3b described in the modification of the first embodiment and the corrugated boards 3c, 3d, 3e described in the third embodiment have the same shape on the upper surfaces of the corrugated boards 3c, 3d, 3e. By bonding the corrugated boards 3c, 3d and 3e having the same pitch, a two-layer structure is formed, and the corrugated boards 3c, 3d and 3e having the same shape and the same pitch are bonded to the lower surface of the corrugated boards 3c, 3d and 3e. As the three-layer structure, it is possible to further give strength, and further, to achieve a desired plate thickness by providing a multilayer structure of four layers or more, and to give sufficient strength as a thick plate material. Similarly, for the corrugated board of the second embodiment, the corrugated board of the second embodiment having the same shape and the same pitch is bonded to the upper surface of the corrugated board of the second embodiment to form a two-layer structure. By attaching the corrugated board of the second embodiment to the lower surface of the corrugated board of the second embodiment to form a three-layer structure, it is possible to increase the strength or to make a multilayer structure of four or more layers. Thus, a desired plate thickness can be realized and sufficient strength as a thick plate material can be provided. In the multilayer structure assembly, the corrugated board material of each layer may be made of the same kind of wood, and the corrugated board material of at least one layer is composed of the corrugated board of other layers. It may be laminated with different types of wood from the material, and all layers of corrugated board material may be laminated with different types of wood from other layers of corrugated board material Is the same as described above.

  Conventionally, for example, a thick plate having a thickness of 20 mm or more cannot be continuously bent with a small curvature of about 2 mmR even if it is bent. However, with this technique, a thin corrugated board is laminated to form a multilayer structure, which can be easily realized even when bending is continuously performed at about 2 mmR. For example, if ten layers of corrugated boards 3, 3b, 3c, 3d, and 3e of t = 2 mm are bonded together, a structure with a continuous bending of about 2 mmR can be easily realized while being a 20 mm thick plywood. In addition, the flexible corrugated boards 3, 3 b, 3 b, 3 b, 3 b, 3 b, 3 b, 3 b, 3 b, 3c, 3d, 3e as a whole, it is possible to make a ring, square curvature or loop shape as a whole, so that the desired three-dimensional dimensions are realized by laminating thin corrugated boards to form a multilayer structure, An assembly (structure) having an arbitrary three-dimensional shape such as a ring can be realized.

  In addition, by using the configuration in which the corrugated boards having the same shape and the same pitch are laminated to form a multilayer structure, a plurality of corrugated boards are two-dimensionally continuous in the vascular bundle direction or the vascular bundle orthogonal direction. It is also possible to sequentially connect them to form a large-area assembly. That is, at the connection part in the two-dimensional direction of a plurality of corrugated boards, the upper corrugated board and the lower corrugated board are out of phase with each other, and the upper corrugated board and the lower corrugated board are tiled continuously. If the assembly has a two-layer structure in which the two-dimensional continuous connection is made sequentially, the strength of the connecting portion in the two-dimensional direction can be maintained. Alternatively, if the upper layer corrugated board and the intermediate layer corrugated board are assembled in a three-layer structure in which the phases are shifted from each other, the strength of the connecting portion in the two-dimensional direction can be maintained. Furthermore, a multilayer structure having a four-layer structure or more can be realized so that a desired area and thickness can be realized simultaneously, and sufficient strength can be obtained as a large structure.

Furthermore, as shown in FIG. 23, the corrugated board 3 _-1 , the corrugated board 3 _-2 and the corrugated board 3 _-3 having the thickness t described in the first embodiment are shown as valley lines and ridge lines. The assembly may be configured by stacking so that the curvature structure lines are orthogonal to each other. That is, the lower surface of the wave board 3 _-1 thickness t described in the first embodiment, as the curvature structure lines are perpendicular to the wave board _3-1, the waveform board _3-2 of the thickness t adhesion bonded by adhesive or the like, and the lower surface of the wave board _3-2 as curvature structure line perpendicular to the wave board 3 _-2, 3-layer bonding waveforms board 3 _-3 thickness t by an adhesive or the like An assembly can be constructed as a structure to provide strength. Although not shown, similarly, an assembly may be configured by laminating three corrugated boards described in the modification of the first embodiment so that the curvature structure lines are orthogonal to each other. The corrugated board described in the second embodiment may also be configured by stacking three corrugated boards so that the curvature structure lines are orthogonal to each other. Also for the corrugated board of the third embodiment, an assembly may be configured by stacking three corrugated boards so that the curvature structure lines are orthogonal to each other. Further, in FIG. 23, has been illustrated an assembly of three-layer structure, it is of course possible to realize a desired thickness when the assembly of the four-layer structure or a multilayer structure, the waveform board 3 _-1 and the waveform Board 3 between _-2 and further sandwiched a flat sheet, be constituted an assembly has a structure as to sandwich a flat sheet in between the waveform boards _3-2 and the waveform board 3 _-3 good. Further, these flat plate-like thin plates may be reinforced by providing lattice-like reinforcing ribs (stresses) or by attaching a rib frame around the flat plate-like thin plate.

Furthermore, as shown in FIG. 24, a waveform board 3d _-1 and a waveform board 3d having a trapezoidal wave topology that pulsates periodically at a pitch p4 in the vascular orthogonal direction, similar to those described in the third embodiment. _-2 and corrugated board 3d- ₃ are bonded to each other with a half cycle (p4 / 2 cycle), for example, so that they can be bonded to each other with a trapezoidal flat part (upper surface or lower surface). A structural assembly may be constructed. That is, the corrugated board 3d- ₂ having a thickness t shifted by a period of p4 / 2 on the lower surface of the corrugated board 3d- ₁ having the same topology as described in the third embodiment with an adhesive or the like. The trapezoidal flat parts are bonded together, and the corrugated board 3d- ₃ having a thickness t is shifted to the lower surface of the corrugated board 3d- _{2 by} a p4 / 2 period, and the trapezoidal flat parts are bonded to each other with an adhesive or the like. The assembly can be configured to have strength. In FIG. 24, an assembly having a three-layer structure is illustrated, but it is needless to say that an assembly having a multilayer structure of four layers or more may be realized to achieve a desired thickness.

In FIG. 24, since the topology of the trapezoidal wave has the same symmetry in the width of the peak and the valley, the three corrugated boards are shifted from each other by about a half cycle (p4 / 2 cycle). as, in the case the width of the peaks and valleys of different asymmetrical trapezoidal wave topology, flipped on the lower surface of the wave board 3d _-1 asymmetrical as shown in FIG. 18, the upper and lower waveforms board 3d _-1 asymmetrical the waveform board 3d _-2 bonding the flat portions of the trapezoidal by an adhesive or the like, further, the waveforms board 3d _-3 underside asymmetric flipped vertically and waveform board 3d _-2 waveforms board 3d _-2 adhesive Thus, the trapezoidal flat portions can be bonded together to form an assembly as a three-layer structure, thereby providing strength.

Further, in the structure of the assembly shown in FIG. 24, a flat plate is further sandwiched between the corrugated board 3d _{- 1} and the corrugated board 3d- _2, and the corrugated board 3d- ₂ and the corrugated board 3d- ₃ are connected. You may comprise the assembly made into the structure which pinches | interposes a plate-shaped thin board also in between. If the structure is such that a flat thin plate is sandwiched, the corrugated board 3d _-1 , the corrugated board 3d _-2 and the corrugated board 3d _-3 can be bonded to each other with a trapezoidal flat part (upper surface or lower surface). In addition, for example, it is not always necessary to shift about a half cycle (p4 / 2 cycle), and even if the pulsation phases of the waveform board 3d _-1 , waveform board 3d _-2 and waveform board 3d _-3 are equal, I do not care. If the structure is such that a flat sheet is sandwiched between the upper layer corrugated board and the intermediate layer corrugated board and a flat sheet is also sandwiched between the intermediate layer corrugated board and the lower layer corrugated board, As the upper layer corrugated board, the intermediate layer corrugated board, and the lower layer corrugated board, the corrugated board 3 described in the first embodiment, the corrugated board 3b described in the modification of the first embodiment, and the third embodiment, respectively. It is possible to adopt a corrugated board having an arbitrary topology such as the corrugated boards 3c and 3e described above. A flat thin plate is sandwiched between the respective layers to form an assembly having a multilayer structure of four layers or more and a desired thickness. You may make it implement | achieve. Further, as described with reference to FIG. 23, similarly, lattice-shaped reinforcing ribs may be provided on the thin plates between layers, or rib frames may be attached around the thin plates.

  23 and FIG. 24, it has been described that a reinforcing rib in the form of a lattice is provided on a thin plate between layers or a rib frame is attached around the thin plate, but the reinforcing rib is the first embodiment. The waveform board 3 described in the embodiment, the waveform board 3b described in the modification of the first embodiment, the waveform board described in the second embodiment, the waveform boards 3c, 3d, 3e described in the third embodiment It can be appropriately attached to itself according to its topology. For example, you may provide the flat rib of the structure matched with the curvature of a curvature structure line, or the angle of a bending line along the curvature structure line and bending line which show a pulsation valley line and a ridge line. Alternatively, an assembly with flat ribs in the direction orthogonal to the curvature structure line may be configured, or an assembly with rib frames around it may be configured to reinforce and maintain lightweight characteristics. It is also possible to realize an assembly with increased

  Furthermore, using such a structure in which reinforcing ribs are provided along a curved structure line or bent line, or a structure in which reinforcing ribs are provided in a direction perpendicular to the curved structure line, the direction of the curved structure line and the direction of the curved structure line are used. A plurality of corrugated boards can be successively and continuously connected two-dimensionally in a direction orthogonal to the above, thereby forming a large-area assembly.

  The bending jig described with reference to FIGS. 3 to 14 of the first embodiment or the bending jig described with reference to FIG. 17 of the third embodiment is merely an example of pressing means. For example, as shown in FIG. 25, a cylindrical first heat roller 75a having periodic first unevenness on the outer periphery, and a second unevenness meshing with the first unevenness are provided, and the first heat roller 75a It is also possible to manufacture the corrugated board described in the first to third embodiments by using a pressing means having a cylindrical second heat roller 75b rotating in the opposite direction as a bending jig. That is, a thickness t = 0.05 to 1.5 mm, preferably a thickness t = 0.15 mm, between the first heat roller 75a and the second heat roller 75b of the bending jig shown in FIG. By introducing a plate 3q of about 1.0 mm with an optimum clearance, it is possible to perform bending by pressing the plate 3q. The optimum clearance is a value approximately proportional to the thickness t. However, the optimum value is determined by conducting preliminary experiments in advance in consideration of the state of the material of the plate 3q as a workpiece and the degree of drying. You just have to. As already described, slicing a thin plate with a thickness of about t = 0.05 mm or less is difficult at the current general technical level, but considering the future progress of slicing technology, t = 0. It does not deny bending of about 05 mm or less. On the other hand, when the thickness t is about 1.5 mm or more, various settings of the press conditions by the first heat roller 75a and the second heat roller 75b are difficult to continuously realize a uniform molded product. Although not preferable in terms of industrial productivity, it is not technically impossible.

Although not shown, the first heat roller 75a and the second heat roller 75b have heating means such as a heater inside, and the first heat roller 75a and the second heat roller 75b are 120 ° C. to 180 ° C. It can be heated in the range, preferably in the range of 130 ° C to 170 ° C. Therefore, the material of the first heat roller 75a and the second heat roller 75b is made of a material such as metal in consideration of the heating temperature of the roller, the wear of the first and second irregularities, the mechanical strength, the life, etc. Just choose. As shown in FIGS. 26 to 27, the first heat roller 75a and the second heat roller 75b are rotated in opposite directions to move the plate 3q in one direction (in FIG. 25, the right direction is an example, 26 to 27, the first heat roller 75a is rotated counterclockwise, and the second heat roller 75b is rotated clockwise to rotate the plate in FIGS. 3q is conveyed in one direction (in the right direction in the configuration illustrated in FIG. 25), for example, at a feed rate of about 0.2 to 0.4 m / min, and the press is continuously advanced sequentially to a part of the plate 3q. be able to. Then, the first heat roller 75a and the second heat roller 75b rotate in directions opposite to each other, and a part of the plate 3q continuously passes between the first heat roller 75a and the second heat roller 75b. The press on the plate 3q of the portion that has been made is released sequentially. By changing the shape of the unevenness provided on the outer circumferences of the first heat roller 75a and the second heat roller 75b, the corrugated board having various topologies described in the first to third embodiments can be bent.

  The first heat roller 75a and the second heat roller 75b constituting the bending jig are accommodated in a roller interval adjusting mechanism (63, 65a to 65d, 67, 68, 69) as shown in FIG. The distance between the first heat roller 75a and the second heat roller 75b is adjusted so as to have an optimum clearance in consideration of the thickness t of the thin plate 3q. As shown in FIG. 25, the roller interval adjusting mechanism (63, 65a to 65d, 67, 68, 69) has a bottom plate 63, and coupling pillars 65a, 65b, 65c, which are fixed at the lower ends to the bottom plate 63 and vertically stand. 65d, an upper plate 67 having an opening at the center fixed to the upper ends of the coupling pillars 65a, 65b, 65c, 65d, and the center of the upper plate 67 so as to close the opening of the upper plate 67 And a clearance adjusting bolt 69 that penetrates the bolt fixing plate 68 via a female screw provided on the bolt fixing plate 68.

  As shown in FIG. 25, the roller interval adjusting mechanism (63, 65a to 65d, 67, 68, 69) is fixed on a pedestal 62c whose lower surface is supported by leg portions 61b, 61c. The leg portion 61b is connected to the leg portion 61a via a connecting beam 62b extending in the horizontal direction. The leg portion 61a is further fixed at the lower end to the table fixing beam 62a and the table fixing beam 62a. A table fixing column 66 and a table 71 having a lower surface fixed to the table fixing column 66 are provided. Further, the table 71 and the roller interval adjusting mechanism (63, 65a to 65d, 67, 68, 69) are spaced apart from each other in correspondence with the first lower drive gear 81a and the first lower drive gear 81a. A lower conveyor 72a driven by the provided second lower drive gear 81b, first lower drive gear 81a and second lower drive gear 81b is provided. A part of the upper part of the lower conveyor 72a is provided with a first upper drive gear 82a, a second upper drive gear 82b spaced apart from the first upper drive gear 82a, and a first upper drive gear. An upper conveyor 72b driven by 82a and the second upper drive gear 82b is provided. As the lower conveyor 72a and the upper conveyor 72b, various conveyors such as a metal mesh conveyor and a rubber conveyor can be adopted.

First, when the plate 3q, which is a workpiece, is placed on the table 71 so that the tip end is on the lower conveyor 72a, the plate 3q placed on the table 71 is moved by the lower conveyor 72a to the upper conveyor 72b. Is conveyed in one direction (right direction in FIG. 25). Further, the plate 3q is conveyed in one direction (rightward in FIG. 25) by the lower conveyor 72a and the upper conveyor 72b, and is introduced between the first heat roller 75a and the second heat roller 75b. Since the steam injection nozzles 73a, 73b, 73c, 73d are provided in the vicinity of the upper conveyor 72b, the plate 3q is caused to contain predetermined moisture by the steam ejected from the steam injection nozzles 73a, 73b, 73c, 73d. Can do.

After the predetermined moisture is included in the plate 3q, the plate 3q is transported by the lower conveyor 72a and the upper conveyor 72b and is rotated between the first heat roller 75a and the second heat roller 75b rotating in opposite directions. As the first heat roller 75a and the second heat roller 75b rotate, the plate 3q is conveyed in one direction (rightward in FIG. 25), so that the press is continuously applied to a part of the plate 3q. The process proceeds sequentially and bending is performed continuously. By passing a part of the plate 3q continuously between the first heat roller 75a and the second heat roller 75b, the press on the plate 3q with respect to the passed part is sequentially released, and the bending process proceeds continuously. To do. A collection mechanism 64 including a collection table holding beam 64b and a collection table 64a supported in an oblique direction by the collection table holding beam 64b is provided on the right side of the base 62c constituting the bending jig. For this reason, the plate 3q that has been continuously bent and conveyed can be recovered by sliding on the recovery table 64a. According to the configuration in which the first heat roller 75a and the second heat roller 75b are used as bending jigs as shown in FIGS. 25 to 27, bending is performed on any long workpiece. It is possible.

Further, the corrugated board 3 described in the first embodiment, the corrugated board 3b described in the modification of the first embodiment, the corrugated board described in the second embodiment, and the corrugated board described in the third embodiment. The strength may be increased by coating or impregnating the resin 3c, 3d, 3e itself with resin or the like. Furthermore, it is also possible to realize an assembly in which the strength is increased by coating or impregnating the structure described in FIGS. 20, 23, 24, and the like and the structures according to those modifications with resin or the like. It is.
Noh.

  As described above, the present invention naturally includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  Since the corrugated boards 3, 3b, 3c, 3d, 3e of the present invention are lightweight and excellent in flexibility and can realize various flexible plate materials, such as packaging members, play equipment, toys, miscellaneous goods including waste bins, baskets, etc. It can be used in the field of household goods such as tableware. In addition, the corrugated boards 3, 3b, 3c, 3d, 3e of the present invention and the assembly using these corrugated boards can be used as a plate material that vibrates or expands and contracts, and has excellent acoustic effects. Therefore, it can be used in the field of building materials such as wall materials. Furthermore, the assembly using the corrugated boards 3, 3b, 3c, 3d, and 3e of the present invention can be made into a product having an arbitrary three-dimensional structure with a degree of freedom. It can also be used in the field of exterior fashion such as garden furniture.

B _1b , B _2b , B _3b ,..., B _{(i-1) b} , B _ib , B _{(i + 1) b} ,..., B _{(n-1) b} , B _nb ..., B _1bb , B _2bb , B _3bb , B _4bb , B _5bb , B _6bb , B _7bb , ..., drive bolts C ₁ , C ₂ , C ₃ , ..., C _i-1 , C _i , C _{i + 1} , ..., C _{n-1 , C n ..., C 1b,} C 2b, C 3b, C 4b, C 5b, C 6b, C 7b, ..., ... connecting the movable element _{UD 1, UD 2, UD 3} , ..., UD i-1, UD _{i, UD i + 1, ...} , UD n-1, UD n, ..., UD 1b, UD 2b, UD 3b, UD 4b, UD 5b, UD 6b, UD 7b, ..., ... press projection LD _{0, LD 1, LD 2, LD 3} , ..., LD j-1, LD j, LD j + 1, ..., LD n, LD n + 1 ..., LD 1b, LD 2b, LD 3b, LD 4b, LD 5b, LD _6b , LD _7b ,..., Lower surface side molding convex portion 1, 1 _b , lower surface side molding pedestal portion 2, 2 b, upper surface side press portion 3 p, 3 cp, thin plate 3 , 3b, 3c, 3d, 3e ... corrugated boards 11a, 11b, 11c, 11cb ... pedestal beams 12a, 12b, 12c, 12d ... legs 21a, 21b, 21bb ... base plate 22a. 22b, 22bb ... bolt fixing beam 31 ... wood 33a ... upper surface thin plate 33b ... lower surface thin plate 35a, 35b ... polymer thin film 51 ... cutlery 61b, 61b. 61c ... Leg 62a ... Table fixing beam 62b ... Connecting beam 62c ... Base 63 ... Bottom plate 64 ... Recovery mechanism 64a ... Recovery table 64b ... Recovery table holding beams 65a, 65b, 65c, 65d ... Connecting column 66 ... Table fixing column 67 ... Upper plate 68 ... Bolt fixing plate 69 ... Clearance adjustment bolt 71 ... Table 72a ... Lower conveyor 72b ... Upper conveyor 73a, 73b, 73c, 73d ... Steam injection nozzle 75a ... First heat roller 75b ... Second heat roller 81a ... First Lower drive gear 81b ... second lower drive gear 82a ... first upper drive gear 82b ... second upper drive gear

Claims (2)

A step of preparing a wood veneer having a thickness of 0.05 to 5 mm;
Adding water to the wood veneer to facilitate bending;
Selecting any one direction on a reference plane defined by a vascular direction in which the vascular bundle of the wood veneer extends and a vascular bundle orthogonal direction that is perpendicular to the vascular direction;
The step of sandwiching the wood single plate made easy to bend between the lower surface side molding pedestal portion and the upper surface side press portion of the bending jig,
Immersing the entire bending jig in warm water or steam; and
A plurality of presses arranged in the horizontal direction on the upper surface side press portion so as to provide a recess in a part of the wood veneer that is an end portion in the arbitrary one direction selected in the warm water or steam. A step of lowering and pressing a part of the convex for use ;
In the warm water or steam, a step of sequentially descending a part of the pressing convex portion so that the concave portion is continuously formed, and forming a corrugated topology along the arbitrary one direction; ,
After the step of forming the corrugated topology in the warm water or steam, the pressing of the pressing protrusions is sequentially returned by a certain amount along the arbitrary direction, and the wood veneer contracts freely. Providing a degree,
Drawing the entire bending jig out of the warm water or steam, and drying the plate ;
After the drying, the step of raising the upper surface side press portion with respect to the lower surface side molding base, separating the lower surface surface side molding base and the upper surface side pressing portion, and taking out the corrugated single plate A method for manufacturing a corrugated veneer, comprising:   The method for manufacturing a corrugated single plate according to claim 1, wherein the arbitrary one direction is the vascular bundle orthogonal direction.

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