Wooden straws

Abstract

To provide a wooden straw that can be repeatedly used and that has a pleasant feeling of use.SOLUTION: A wooden straw includes a thin first semi-cylindrical member 1A and a second semi-cylindrical member 1B that are formed into a roughly semi-cylindrical shape using wood. The first semi-cylindrical member 1A has a first left longitudinal end face 15 and a first right longitudinal end face 16 as two longitudinally extending first longitudinal end faces, Similarly the second semi-cylindrical member 1B has a second left longitudinal end face 25 and a second right longitudinal end face 26 as two longitudinally extending second longitudinal end faces. These first and second end faces are butted against each other and integrated, with a cylindrical shape thereby formed which has a prescribed length. Between the first left longitudinal end face 15 and the second left longitudinal end face 25, there is formed a resin layer R2 over a longitudinal direction. Also, between the first right longitudinal end face 16 and the second right longitudinal end face 26, there is formed a resin layer R1 over a longitudinal direction. With the resin layers R1, R2, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are adhered to each other.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a wooden straw made of wood. [Background technology]

[0002] In recent years, countries around the world have been calling for the reduction of waste plastics as a measure against environmental pollution. In particular, plastic straws provided with drinks at restaurants, convenience stores, etc. are in high circulation and have a low reuse rate when recycled due to their small volume, and most of them are disposable, so an immediate response is required.

[0003] Therefore, paper straws that do not use plastic materials have been developed. For example, this type of paper straw is formed into a tube shape with both ends connected by overlapping the side edges of a strip-shaped base material made mainly of paper, rolling it diagonally, and bonding the overlapping side edges (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Utility Model Registration No. 3216663 (page 4, figure 4) Summary of the Invention [Problem to be solved by the invention]

[0005] While switching from plastic straws to paper straws will lead to a reduction in plastic waste, paper straws have problems in that they become weak when they absorb liquid, making them difficult to reuse, and they also have a poor feel in the mouth.

[0006] The present invention has been made in response to these problems, and aims to provide a wooden straw that can be reused repeatedly and is comfortable to use. [Means for solving the problem]

[0007] In order to solve the above problems, the wooden straw of the present invention is: A wooden straw made of wood, The device has a first semi-cylindrical member and a second semi-cylindrical member each of which is made of wood and has a thin wall and is formed into a substantially semi-cylindrical shape. two first longitudinal end faces of the first semi-cylindrical member extending in a longitudinal direction and two second longitudinal end faces of the second semi-cylindrical member extending in a longitudinal direction are butted against each other and integrated together to form a cylindrical shape having a predetermined length; A resin layer is formed in the longitudinal direction between the two first longitudinal end faces and the two second longitudinal end faces, and the first semi-cylindrical member and the second semi-cylindrical member are bonded together by the resin layer. According to this feature, when the first semi-cylindrical member and the second semi-cylindrical member, which are thin-walled pieces of wood, are formed into a cylindrical shape, the two resin layers extending longitudinally between the first longitudinal end face and the second longitudinal end face, which are stronger than wood, act as reinforcing materials, improving the strength of the straw and making it less likely to break or leak, allowing for repeated use, and since it is made of wood, the feel in the mouth and other aspects of the product are favorably improved.

[0008] The first semi-cylindrical member and the second semi-cylindrical member are characterized in that an inner peripheral resin layer is formed on the inner peripheral surfaces of the first semi-cylindrical member and the second semi-cylindrical member in the longitudinal direction. According to this feature, the strength of the outer peripheral surface against external forces is improved, so that the outer peripheral surface is less likely to be crushed even if a user grips it.

[0009] The resin layer and the inner peripheral resin layer are formed integrally. According to this feature, the external force is distributed over the entire inner circumferential surface and the longitudinal end surfaces, thereby further improving the strength.

[0010] The resin layer and the inner peripheral resin layer are characterized in that they are made of the same type of resin material. According to this feature, the two resin layers can be formed from the same type of resin material, which facilitates manufacturing and improves strength when integrated.

[0011] The first semi-cylindrical member and the second semi-cylindrical member are characterized in that they are formed into a semi-cylindrical shape by cutting wood. According to this feature, the strength of the first semi-cylindrical member and the second semi-cylindrical member is improved, and the appearance and the feel are improved.

[0012] The two first longitudinal end faces and the two second longitudinal end faces are characterized by being inclined surfaces inclined with respect to the diameter of the wooden straw. According to this feature, the longitudinal end surfaces, that is, the bonding area, can be increased without increasing the thickness of the first semi-cylindrical member or the second semi-cylindrical member, so that strong bonding can be achieved.

[0013] The present invention is characterized in that a convex portion is formed along the longitudinal direction on one of the two first longitudinal end faces and the two second longitudinal end faces, and a concave portion capable of fitting into the convex portion is formed along the longitudinal direction on the other two longitudinal end faces. According to this feature, the longitudinal end surfaces, i.e., the bonding area, can be increased without thickening the first semi-cylindrical member or the second semi-cylindrical member, thereby enabling strong bonding and effectively preventing misalignment between the first longitudinal end surface and the second longitudinal end surface.

[0014] A method for manufacturing wooden straws made of wood, comprising the steps of: A first step of forming a groove extending in a longitudinal direction on one surface of a first piece of wood and a second piece of wood; A second step of applying a resin material to both edge portions of the groove in at least one of the first wooden piece and the second wooden piece; a third step of butting the first wooden piece against the second wooden piece with the grooves facing each other and bonding them together with the resin material; A fourth step of cutting the other surface of the first wood piece and the second wood piece bonded in the third step, the other surface being opposite to the one surface, to form a cylindrical shape; The present invention is characterized by the following. According to this feature, two resin layers stronger than wood that extend in the longitudinal direction between the first longitudinal end face of the thin-walled first semi-cylindrical member and the second longitudinal end face of the second semi-cylindrical member function as reinforcing materials, improving the strength of the straw, making it less likely to break and less likely to leak, allowing for repeated use, and because it is made of wood, the feel in the mouth and other aspects of use are favorably improved. Also, it becomes easier to manufacture wooden straws that are strong even though they are thin. [Brief description of the drawings]

[0015] [Figure 1] FIG. 1(a) is a perspective view showing a wooden straw as an embodiment of the present invention. [Diagram 2] 1(a) to 1(e) are schematic diagrams showing the process for producing wooden straws. [Diagram 3] 3(a) shows a front view of the wooden straw, (b) shows a cross-sectional view taken along line AA in FIG. 3(a), and (c) shows a cross-sectional view taken along line BB in FIG. 3(a). [Figure 4] 13(a) and 13(b) are front views showing modified examples of the first long end surface and the second long end surface. [Diagram 5] 13(a) and 13(b) are front views showing modified examples of the first long end surface and the second long end surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0016] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will now be given of an embodiment of the wooden straw according to the present invention. EXAMPLES

[0017] A wooden straw according to an embodiment of the present invention will be described with reference to Figures 1 to 5. In the following, the left front side of the paper in Figure 1(a) and the front side of Figure 3(a) are defined as the front side, and the top, bottom, left, right, front and rear directions when viewed from the front side are used as references.

[0018] First, as shown in FIG. 1, the wooden straw 1 of the present invention has a first semi-cylindrical member 1A and a second semi-cylindrical member 1B formed into an approximately semi-cylindrical shape from wood. The first semi-cylindrical member 1A has a first left longitudinal end face 15 and a first right longitudinal end face 16 extending longitudinally on the left and right sides of the circumference of the first semi-cylindrical member 1A, and the second semi-cylindrical member 1B has a second left longitudinal end face 25 and a second right longitudinal end face 26 extending longitudinally on the left and right sides of the circumference of the second semi-cylindrical member 1B. These are butted together and integrally bonded together with a resin material R to form an approximately cylindrical shape.

[0019] As shown in Fig. 3(a), the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed in substantially the same shape. The first semi-cylindrical member 1A has an inner peripheral surface 11 formed in a semicircular shape and an outer peripheral surface 12 formed in a semicircular shape concentric with the inner peripheral surface 11, and the plate thickness dimension L1 in the radial direction is about 1 to 5 mm. In addition, the front side end surface 13 and the back side end surface 14, which are semicircular when viewed from the front, are formed at the ends on the front side and the back side in the longitudinal direction, and the first left longitudinal end surface 15 and the first right longitudinal end surface 16, which are flat first longitudinal end surfaces, are formed on the left and right sides in the circumferential direction of the first semi-cylindrical member 1A.

[0020] The second semi-cylindrical member 1B has an inner peripheral surface 21 formed in an arc shape, and an outer peripheral surface 22 formed in an arc shape concentric with the inner peripheral surface 21, and has a radial plate thickness dimension L1 of about 1 to 5 mm. A front end surface 23 and a rear end surface 24 are formed at the longitudinal front and rear end portions, and a second left longitudinal end surface 25 and a second right longitudinal end surface 26 are formed as flat second longitudinal end surfaces at the circumferential left and right sides of the second semi-cylindrical member 1B.

[0021] Thus, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B have a substantially semi-cylindrical shape obtained by dividing a perfectly circular cylinder into two along the central axis facing the longitudinal direction.

[0022] 2(a) to 2(e), an example of a process for manufacturing a plurality of wooden straws 1 will be described. Note that the manufacturing method for the wooden straws 1 is not limited to the method described below, and various other manufacturing methods are also possible.

[0023] 2(a), the first wooden piece 4 is a board made by processing thinned coniferous wood into a rectangular shape in a plan view having a predetermined board thickness, and has a front surface 41, a left side surface 42, a right side surface 43, a top surface 44, a bottom surface 45, and a back surface (not shown). First, in a first step S1, a plurality of grooves 4A (six rows in this embodiment) that are approximately semicircular in a front view and extend linearly from the front surface 41 to the back surface are formed on the top surface 44 of the first wooden piece 4 by cutting.

[0024] Next, in the second step S2, as shown in Fig. 2(b), a resin material R is applied to the left and right edge portions 44A of each groove 4A on the top surface 44 of the first wooden piece 4 and to the multiple grooves 4A. The resin material R is preferably a resin material that is less harmful to the human body and has high adhesiveness and heat resistance. In this embodiment, epoxy, a thermosetting resin, is used, but it is not limited to epoxy, and various other resin materials such as urethane, silicone, lacquer, etc. may be used. In addition, the method of applying the resin material R to the first wooden piece is not limited to the method, and may be application using a brush or a paint brush, spraying using an airbrush, or immersing the top surface 44 of the first wooden piece 4 and the multiple grooves 4A in a container filled with the resin material R.

[0025] On the other hand, the second wooden piece 5 is a board made by processing thinned coniferous wood into a rectangular shape in a plan view with a specified board thickness, and is formed in the same shape as the first wooden piece 4, and has a front surface 51, a left side surface 52, a right side surface 53, a top surface 54, a bottom surface 55, and a back surface (not shown), and is formed in the same shape as the first wooden piece 4 by undergoing the first and second steps in the same way as the first wooden piece 4.

[0026] Next, in the third process S3, as shown in FIG. 2(c), the front 41 and back of the first wooden piece 4 are aligned so that they are flush with the front 51 and back of the second wooden piece 5, and similarly the left side 42 and right side 43 of the first wooden piece 4 are aligned so that they are flush with the left side 52 and right side 53 of the second wooden piece 5, and the first wooden piece 4 and the second wooden piece 5 are positioned so that the grooves 4A and 5A and the edges 44A and 54A of the first wooden piece 4 and the edge 54A of the second wooden piece 5 are butted together via the resin material R, and the first wooden piece 4 and the second wooden piece 5 are integrated by leaving them in place until the resin material R hardens.

[0027] In this embodiment, the first wooden piece 4 and the second wooden piece 5 are formed to have the same shape, and therefore can be positioned by aligning the sides of the first wooden piece 4 and the second wooden piece 5; however, the first wooden piece 4 and the second wooden piece 5 do not have to have the same shape. In this case, multiple grooves 4A, 5A of at least the same shape can be formed at equal intervals, and the pieces can be positioned so that the grooves 4A and 5A and the edge portions 44A and 54A of each other are butted up against each other.

[0028] Next, in a fourth step S4, as shown in Fig. 2(d), the first wooden piece 4 and the second wooden piece 5 integrated via the resin material R are fed into a cutting machine (not shown) from the front sides 41, 51. The cutting machine is equipped with a feed conveyor and multiple cutting blades, and the integrated first wooden piece 4 and the second wooden piece 5 are fed by the feed conveyor of the cutting machine with the grooves 4A, 5A oriented along the feed direction, whereby both sides of the lower surfaces 45, 55 of the first wooden piece 4 and the second wooden piece 5 (the shaded areas surrounded by two-dot chain lines in Fig. 2(d)) are cut, and the outer peripheral surface 12 of each of the first semi-cylindrical members 1A and the outer peripheral surface 22 of each of the second semi-cylindrical members 1B are formed. In addition, in the edge portions 44A, 54A adjacent to each groove 4A, 5A and in the resin material R interposed between the edge portions 44A and 54A, portions other than those corresponding to the plate thicknesses of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are cut out, and six wooden straws 1 are formed as shown in FIG. 2(e).

[0029] In this manner, through the above-mentioned first step S1 to fourth step S4, a plurality of wooden straws 1 (six in this embodiment) are formed which are approximately cylindrical when viewed from the front (longitudinal cross section) and are composed of a first semi-cylindrical member 1A, a second semi-cylindrical member 1B, and a resin material R, as shown in FIG. 2(e).

[0030] 3(a), the wooden straw 1 manufactured by the above-mentioned manufacturing process has a resin layer R1 formed between the first left longitudinal end face 15 of the first semi-cylindrical member 1A and the second left longitudinal end face 25 of the second semi-cylindrical member 1B along the longitudinal direction, and a resin layer R2 formed between the first right longitudinal end face 16 of the first semi-cylindrical member 1A and the second right longitudinal end face 26 of the second semi-cylindrical member 1B along the longitudinal direction, so that the two resin layers, which are stronger than wood, function as reinforcing materials, improving the strength against bending of the wooden straw 1. In addition, the resin layers R1 and R2 suitably prevent liquid leakage from the joints between the first left longitudinal end face 15 and the second left longitudinal end face 25 and between the first right longitudinal end face 16 and the second right longitudinal end face 26.

[0031] 3(a) to 3(c), the thickness dimension L2 of the resin layers R1 and R2 is about 0.1 to 2 mm, and is preferably shorter than the plate thickness dimension L1 of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B (L1>L2). Note that the thickness dimension L2 of the resin layers R1 and R2 may be approximately the same as the plate thickness dimension L1.

[0032] In addition, by forming the cylindrical inner resin layer R3 on the inner surface 11 of the first semi-cylindrical member 1A and the inner surface 21 of the second semi-cylindrical member 1B in the longitudinal direction, even if the user grips near the apex of the outer surface 12, 22, that is, a position that does not correspond to the resin layers R1, R2 on the outer surface of the wooden straw 1, the strength against pressure applied radially from the outer periphery is improved, so the straw is less likely to be crushed. In addition, the inner resin layer R3 and the resin layers R1, R2 are made of the same type of resin material and are formed integrally by being applied and hardened at once. Therefore, even if the user grips the position corresponding to the resin layers R1, R2 and the inner resin layer R3, that is, any position on the outer surface, the strength against pressure applied radially from the outer periphery is further improved because the external force is distributed over the entire longitudinal end surface of the inner surfaces 11, 21.

[0033] As described above, the wooden straw 1 according to the embodiment of the present invention has a first semi-cylindrical member 1A and a second semi-cylindrical member 1B that are thin-walled and formed into a roughly semi-cylindrical shape from wood. The first semi-cylindrical member 1A has a first left longitudinal end face 15 and a first right longitudinal end face 16 as two first longitudinal end faces extending in the longitudinal direction, and the second semi-cylindrical member 1B has a second left longitudinal end face 25 and a second right longitudinal end face 26 as two second longitudinal end faces extending in the longitudinal direction. The first semi-cylindrical member 1A and the second semi-cylindrical member 1B are butted together and integrated to form a cylindrical shape having a predetermined length. A resin layer R1 is formed between the first left longitudinal end face 15 and the second left longitudinal end face 25 in the longitudinal direction, and a resin layer R2 is formed between the first right longitudinal end face 16 and the second right longitudinal end face 26 in the longitudinal direction. The first semi-cylindrical member 1A and the second semi-cylindrical member 1B are bonded together by the resin layers R1 and R2.

[0034] By doing this, when the first semi-cylindrical member 1A and the second semi-cylindrical member 1B, which are made of thin wood, are formed into a cylindrical shape, the two resin layers extending longitudinally between the first left and first right longitudinal end faces 15 and 16 and the second left and second right longitudinal end faces 25 and 26, which are stronger than wood, act as reinforcing materials and increase the strength, making the straw less likely to break and less likely to leak, allowing for repeated use, and since it is made of wood, the feel in the mouth and other aspects of the product are favorably improved.

[0035] In addition, since a cylindrical inner peripheral resin layer R3 is formed along the longitudinal direction on the inner peripheral surfaces 11, 21 of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B, the strength of the outer peripheral surfaces 12, 22 against external forces is improved, making them less likely to be crushed even if a user grips the outer peripheral surfaces 12, 22. In addition, the strength of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B is increased, making it easier to form a thin plate thickness L1, making it easier to manufacture small-diameter wooden straws 1.

[0036] In addition, since the resin layers R1, R2 and the inner peripheral resin layer R3 are integrally formed, external forces are distributed to the inner peripheral surfaces 11, 21 and the entire longitudinal end surfaces, thereby further improving the strength.

[0037] In addition, since the resin layers R1, R2 and the inner peripheral resin layer R3 are made of the same type of resin material, the two resin layers can be made of the same type of resin material, which facilitates manufacturing and improves the strength when integrated. Note that the resin layers R1, R2 and the inner peripheral resin layer R3 may be made of different resin materials.

[0038] Furthermore, since the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed into a semi-cylindrical shape by cutting wood, the strength is improved and the appearance and feel are improved compared to when the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed by connecting multiple rods.

[0039] In addition, since the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed from the first wooden piece 4 and the second wooden piece 5, which are made by processing thinned coniferous wood into a rectangular shape in plan view with a specified board thickness, the unevenness caused by the grain characteristic of wood may cause the peripheral surface to have places that are thinner than the other peripheral surfaces or holes due to knots. By applying the resin material R to such places and forming an inner peripheral resin layer R3 to reinforce them, liquid leakage can be prevented.

[0040] In addition, a manufacturing method for wooden straws made of wood as an embodiment of the present invention includes a first step of forming a groove extending in the longitudinal direction on one side of the first and second wooden pieces, a second step of applying a resin material to both side edges of the groove on at least one of the first and second wooden pieces, a third step of butting the first and second wooden pieces together with the grooves facing each other and bonding them together with the resin material, and a third step of cutting the other side of the first and second wooden pieces bonded together in the third step. Since the method includes a fourth step of forming the straw into a cylindrical shape, two resin layers stronger than wood extending longitudinally between the first left and first right longitudinal end faces 15 and 16 of the thin-walled first semi-cylindrical member 1A and the second left and second right longitudinal end faces 25 and 26 of the second semi-cylindrical member 1B function as reinforcing materials to improve the strength of the straw, making it less likely to break and less likely to leak, allowing for repeated use, and since the straw is made of wood, the feel in the mouth and other aspects of use are favorably improved. Also, it becomes easier to manufacture wooden straws 1 that are thin but strong.

[0041] In this embodiment, six wooden straws are produced, but the present invention is not limited to this, and five or fewer or seven or more wooden straws may be produced in the first to fourth steps. Also, one wooden straw may be produced in the first to fourth steps. The first and second semi-cylindrical members 1A and 1B may be bonded together via the resin layers R1 and R2, the first and second semi-cylindrical members being formed by a method other than the above steps.

[0042] Next, a modified example of the wooden straw 1 according to the embodiment of the present invention will be described with reference to Figs. 4(a) and 4(b) and Figs. 5(a) and 5(b).

[0043] In the above embodiment, the end face shapes of the first left longitudinal end face 15 and the first right longitudinal end face 16 of the first semi-cylindrical member 1A and the second left longitudinal end face 25 and the second right longitudinal end face 26 of the second semi-cylindrical member 1B are flat faces parallel to the left-right diameter of the wooden straw 1, but the present invention is not limited to this. For example, as in the wooden straw 100A shown in FIG. 4(a), the first left longitudinal end face 15 and the first right longitudinal end face 16 of the first semi-cylindrical member 1A and the second left longitudinal end face 25 and the second right longitudinal end face 26 of the second semi-cylindrical member 1B may be inclined faces that incline downward with respect to the diameter of the wooden straw 1.

[0044] In this manner, the first left longitudinal end face 15 and the first right longitudinal end face 16 of the first semi-cylindrical member 1A and the second left longitudinal end face 25 and the second right longitudinal end face 26 of the second semi-cylindrical member 1B intersect in the radial direction, and the joint ends of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B overlap in the radial direction, resulting in high durability against diametric shear forces.

[0045] In addition, in Figure 4 (a), the first left longitudinal end face 15 and the first right longitudinal end face 16 of the first semi-cylindrical member 1A and the second left longitudinal end face 25 and the second right longitudinal end face 26 of the second semi-cylindrical member 1B are symmetrical inclined surfaces, but the left side inclined surfaces of the first left longitudinal end face 15 and the second left longitudinal end face 25 and the right side inclined surfaces of the first right longitudinal end face 16 and the second right longitudinal end face 26 may be arranged parallel to each other.

[0046] Also, as in the wooden straw 100B shown in FIG. 4(b), the first left longitudinal end face 15 of the first semi-cylindrical member 1A and the second right longitudinal end face 26 of the second semi-cylindrical member 1B may be formed into a generally curved concave shape when viewed from the front, and the first right longitudinal end face 16 of the first semi-cylindrical member 1A and the second left longitudinal end face 25 of the second semi-cylindrical member 1B may be formed into a generally curved convex shape when viewed from the front, and the first semi-cylindrical member 1A and the second semi-cylindrical member 1B may be butted together.

[0047] By doing this, the longitudinal end faces, i.e., the bonding area, can be increased without making the first semi-cylindrical member 1A or the second semi-cylindrical member 1B thicker, thereby enabling strong bonding, and the engagement effectively prevents misalignment between the first left longitudinal end face 15 and the second left longitudinal end face 25, and the first right longitudinal end face 16 and the second right longitudinal end face 26, and the first left longitudinal end face 15 and the second left longitudinal end face 25, and the first right longitudinal end face 16 and the second right longitudinal end face 26 overlap radially, thereby increasing durability against diametric shear forces. Furthermore, since the first left longitudinal end face 15, the second left longitudinal end face 25, and the first right longitudinal end face 16, and the second right longitudinal end face 26 are formed in an arc shape, the stress applied to the end faces is dispersed by the arc surfaces, thereby preventing damage to the arc-shaped joint ends machined into the thin-walled first semi-cylindrical member 1A and second semi-cylindrical member 1B.

[0048] Also, as in the wooden straw 100C shown in FIG. 5(a), convex stripes 15a, 16a may be formed along the longitudinal direction on the right side in the left-right direction of the first left longitudinal end face 15 and the first right longitudinal end face 16 of the first semi-cylindrical member 1A, while concave stripes 25a, 26a may be formed along the longitudinal direction on the right side in the left-right direction of the second left longitudinal end face 25 and the second right longitudinal end face 26 of the second semi-cylindrical member 1B, so that the convex stripes 15a, 16a fit into the concave stripes 25a, 26a.

[0049] In this manner, the longitudinal end faces, i.e., the bonding area, can be increased without making the first semi-cylindrical member 1A or the second semi-cylindrical member 1B thicker, thereby enabling strong bonding. In addition, the convex ribs 15a, 16a and the concave ribs 25a, 26a fit together circumferentially, so that the first left longitudinal end face 15 and the second left longitudinal end face 25, and the first right longitudinal end face 16 and the second right longitudinal end face 26 overlap radially, thereby providing high durability against diametral shear forces.

[0050] Also, as in the wooden straw 100D shown in FIG. 5(b), a convex strip 15a may be formed along the longitudinal direction on the right side of the first left longitudinal end face 15 of the first semi-cylindrical member 1A, a convex strip 16b may be formed along the longitudinal direction on the left side of the first right longitudinal end face 16, a concave strip 25a may be formed along the longitudinal direction on the right side of the second left longitudinal end face 25 of the second semi-cylindrical member 1B, and a concave strip 26a may be formed along the longitudinal direction on the left side of the second right longitudinal end face 26, so that the convex strips 15a, 16b fit into the concave strips 25a, 26b.

[0051] In this manner, the longitudinal end surfaces, i.e., the bonding area, can be increased without making the first semi-cylindrical member 1A or the second semi-cylindrical member 1B thicker, thereby enabling strong bonding. In addition, the convex ridges 15a, 16b and the concave ridges 25a, 26b engage with each other symmetrically in the circumferential direction, thereby restricting left-right movement of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B, thereby increasing durability against diametric shear forces.

[0052] Although the embodiments of the present invention have been described above with reference to the drawings, the specific configuration is not limited to these embodiments, and the present invention also includes modifications and additions that do not deviate from the gist of the present invention.

[0053] For example, in the above embodiment, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed into a substantially semi-cylindrical shape, and when integrated through the resin layers R1 and R2, a cylindrical shape is formed. However, the present invention is not limited to this, and the semi-cylindrical member may be not only a plate material having a semicircular shape when viewed from one end side in the longitudinal direction (the front and back sides in this embodiment), but also a plate material having an arch shape. In other words, if the first semi-cylindrical member and the second semi-cylindrical member are integrated into a cylindrical shape, the outer peripheral shape and the inner peripheral shape of the wooden straw 1 are not limited to a perfect circle but can be arbitrarily deformed, and the outer peripheral shape and the inner peripheral shape when viewed from one end side in the longitudinal direction (the front and back sides in this embodiment) may be a circle, an ellipse, a polygon, a star, or the like. The outer peripheral shape and the inner peripheral shape may be different shapes.

[0054] In addition, in the above embodiment, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed to have the same shape, that is, a shape in which a perfectly circular cylinder is divided into two along the central axis facing the longitudinal direction (the first semi-cylindrical member and the second semi-cylindrical member are divided into upper and lower parts at a ratio of 55), but the present invention is not limited to this, and for example, the first semi-cylindrical member and the second semi-cylindrical member may be divided so that the ratio of their volumes (or areas when viewed from the front) is other than 55 (for example, 64 or 73).

[0055] In addition, in the above embodiment, a resin layer R1 is formed along the longitudinal direction between the first left longitudinal end face 15 of the first semi-cylindrical member 1A and the second left longitudinal end face 25 of the second semi-cylindrical member 1B, a resin layer R2 is formed along the longitudinal direction between the first right longitudinal end face 16 of the first semi-cylindrical member 1A and the second right longitudinal end face 26 of the second semi-cylindrical member 1B, and a cylindrical inner resin layer R3 is formed along the longitudinal direction on the inner surface 11 of the first semi-cylindrical member 1A and the inner surface 21 of the second semi-cylindrical member 1B. However, the present invention is not limited to this, and it is sufficient that at least resin layers R1 and R2 are formed, and the inner resin layer R3 does not have to be formed.

[0056] In addition, in the above embodiment, the resin layer R1, the resin layer R2 and the inner resin layer R3 are formed from the same synthetic resin material (e.g., epoxy resin material), but the present invention is not limited to this, and the resin layer R1, the resin layer R2 and the inner resin layer R3 may each be formed from a different resin material, or at least two of the resin layer R1, the resin layer R2 and the inner resin layer R3 may be formed from the same resin material.

[0057] In the above embodiment, the resin layer R1, the resin layer R2, and the inner peripheral resin layer R3 are each formed of one layer, but the present invention is not limited to this, and may be formed of two or more resin layers. For example, after applying a water-repellent resin material to form the resin layer R1, the resin layer R2, and the inner peripheral resin layer R3, a resin material for adhesion may be applied between the resin layer R1 and the resin layer R2 to bond the first left longitudinal end face 15 and the second left longitudinal end face 25 and the first right longitudinal end face 16 and the second right longitudinal end face 26. Since the water-repellent resin material has a lower viscosity than the adhesive resin material, it easily penetrates from the surface of the porous wood toward the inside, and becomes attached to the wood over a wide surface area. By bonding the first left longitudinal end face 15 and the second left longitudinal end face 25, and the first right longitudinal end face 16 and the second right longitudinal end face 26, which have been coated with the water-repellent resin material, with the adhesive resin material, the fixing strength between the first semi-cylindrical member 1A and the second semi-cylindrical member 1B is increased.

[0058] In addition, in the cutting process, the first wooden piece 4 and the second wooden piece 5 are positioned so that their respective grooves 4A and 5A face each other and are integrated with the resin material R before the cutting process is performed, but this is not limited to the above. It is also possible to position a cylindrical body having approximately the same shape as the approximately cylindrical space formed between the grooves 4A and 5A as a temporary core and remove the temporary core after the cutting process.

[0059] In addition, in the above embodiment, a form in which no resin layer is formed on the outer peripheral surfaces 12, 22 of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B is exemplified, but the present invention is not limited to this, and a resin layer made of a water repellent agent or a resin layer made of a coating material such as varnish may be formed.

[0060] In addition, in the above embodiment, an example was given of a form in which the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed by cutting wood, but the present invention is not limited to this, and the first semi-cylindrical member 1A and the second semi-cylindrical member 1B may be formed by connecting a plurality of wooden bars, or may be formed by bending a single plate material.

[0061] In addition, in the above embodiment, an example was given of a form in which the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed by cutting wood using a cutting machine, but the present invention is not limited to this, and the lower surface 45 of the first wood 4 and the lower surface 55 of the second wood 5 may also be cut using a router or the like.

[0062] In addition, in the above embodiment, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed from thinned materials of coniferous trees, but the present invention is not limited to this, and the first semi-cylindrical member 1A and the second semi-cylindrical member 1B may be formed from thinned materials of broad-leaved trees, laminated timber made of wood powder or bamboo powder, or wood other than thinned materials. [Explanation of symbols]

[0063] 1 wooden straw 1A First semi-cylindrical member (first cylindrical member) 1B Second semi-cylindrical member (second cylindrical member) 4 1st wood 4A, 5A groove 5 Second wood 15 1st left long end face (long end face) 15a Convex stripe (convex part) 16 First right long side end face (long side end face) 16a Convex stripe (convex part) 25 2nd left long end face (long end face) 25a Concave 26 Second right long side end face (long side end face) 26a Concave stripe (concave) 100A~D Wooden straws R1, R2 resin layer R3 Inner circumference resin layer

Claims

1. A wooden straw made of wood, The device has a first semi-cylindrical member and a second semi-cylindrical member each of which is made of wood and has a thin wall and is formed into a substantially semi-cylindrical shape, The first semi-cylindrical member is a plate material having a plate thickness of 1 mm or more and 5 mm or less, The second semi-cylindrical member is a plate material having a plate thickness of 1 mm or more and 5 mm or less, two first longitudinal end faces which are end faces on one side and the other side in the circumferential direction of the first semi-cylindrical member, do not protrude from the outer peripheral surface of the first semi-cylindrical member, and extend in the longitudinal direction of the first semi-cylindrical member; and two second longitudinal end faces which are end faces on one side and the other side in the circumferential direction of the second semi-cylindrical member, do not protrude from the outer peripheral surface of the second semi-cylindrical member, and extend in the longitudinal direction of the second semi-cylindrical member. The two first longitudinal end faces are integrated with each other to form a cylindrical shape having a predetermined length, A wooden straw characterized in that a resin layer is formed in the longitudinal direction between the two first longitudinal end faces and the two second longitudinal end faces, and the first semi-cylindrical member and the second semi-cylindrical member are bonded together by the resin layer.

2. The wooden straw according to claim 1, wherein an inner peripheral resin layer is formed along the longitudinal direction on the inner peripheral surfaces of the first semi-cylindrical member and the second semi-cylindrical member.

3. The wooden straw according to claim 2, wherein the resin layer and the inner peripheral resin layer are integrally formed.

4. The wooden straw according to claim 2 or 3, wherein the resin layer and the inner peripheral resin layer are made of the same type of resin material.

5. The wooden straw according to any one of claims 1 to 4, characterized in that the first semi-cylindrical member and the second semi-cylindrical member are formed into a semi-cylindrical shape by cutting wood.

6. The wooden straw according to any one of claims 1 to 5, characterized in that the two first longitudinal end faces and the two second longitudinal end faces are inclined surfaces that are inclined with respect to a diameter of the wooden straw.

7. The wooden straw according to any one of claims 1 to 5, characterized in that a convex portion is formed along the longitudinal direction on one of the two first longitudinal end faces and the two second longitudinal end faces, and a concave portion that can fit into the convex portion is formed along the longitudinal direction on the other of the two longitudinal end faces.

8. A method for manufacturing wooden straws made of wood, comprising the steps of: A first step of forming a groove extending in a longitudinal direction on one surface of a first wooden piece and a second wooden piece; a second step of applying a resin material to both edge portions of the groove in at least one of the first wooden piece and the second wooden piece; a third step of butting the first wooden piece against the second wooden piece with the grooves facing each other and bonding them together with the resin material; The other surface of the first wood piece and the second wood piece bonded together in the third step is cut to form a cylindrical shape. The first wooden piece is formed into a first semi-cylindrical member, which is a thin-walled plate material having a thickness of 1 mm or more and 5 mm or less, The second wooden piece is formed into a second semi-cylindrical member, which is a thin-walled plate material having a thickness of 1 mm or more and 5 mm or less, a fourth step of butting together and integrating two first longitudinal end faces which are end faces on one and the other sides in the circumferential direction of the first semi-cylindrical member, do not protrude from the outer circumferential surface of the first semi-cylindrical member, and extend in the longitudinal direction of the first semi-cylindrical member, and two second longitudinal end faces which are end faces on one and the other sides in the circumferential direction of the second semi-cylindrical member, do not protrude from the outer circumferential surface of the second semi-cylindrical member, and extend in the longitudinal direction of the second semi-cylindrical member; A method for manufacturing wooden straws, comprising:

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