JP7650487B2 - Wooden straws - Google Patents

Description

Article 30, paragraph 2 of the Patent Act is applicable. Published on October 30, 2020, on page 24 of "Kino Straw" (by Ayano Nishiguchi)

The present invention relates to wooden straws made of wood.

In recent years, countries around the world have been calling for a reduction in plastic waste as a measure against environmental pollution. In particular, plastic straws provided with drinks at restaurants, convenience stores, etc. are distributed in large quantities and are small in volume, so the reuse rate when recycled is low and most of them are disposable, so urgent action is needed.

As a result, paper straws that do not use plastic materials have been developed. For example, this type of paper straw is made by overlapping the side edges of a strip-shaped base material made mainly of paper, rolling it diagonally, and gluing the overlapping side edges together to form a tube with both ends connected (see, for example, Patent Document 1).

Utility Model Registration No. 3216663 (page 4, figure 4)

While switching from plastic straws to paper straws will help reduce plastic waste, paper straws lose strength when they absorb liquid, making them difficult to reuse, and they also have problems with feel in the mouth and other aspects.

The present invention was made to address these problems, and aims to provide a wooden straw that can be reused repeatedly and is comfortable to use.

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 and second semi-cylindrical members, which are thin-walled pieces of wood, are formed into a cylindrical shape, two resin layers stronger than wood extending longitudinally between the first and second longitudinal end faces 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.

The first semi-cylindrical member and the second semi-cylindrical member each have an inner peripheral resin layer formed on their inner peripheral surfaces 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.

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.

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.

The first and second semi-cylindrical members are each 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.

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, i.e., the bonding area, can be increased without increasing the thickness of the first semi-cylindrical member or the second semi-cylindrical member, thereby enabling strong bonding.

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 making the first semi-cylindrical member or the second semi-cylindrical member thicker, thereby enabling strong bonding and effectively preventing misalignment between the first longitudinal end surface and the second longitudinal end surface.

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;
A fourth step of cutting the other surface of the first wood piece and the second wood piece bonded together 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.

FIG. 1A is a perspective view showing a wooden straw according to an embodiment of the present invention. 1(a) to 1(e) are schematic diagrams showing the process of manufacturing wooden straws. 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). 13A and 13B are front views showing modified examples of the first long side end surface and the second long side end surface. 13A and 13B are front views showing modified examples of the first long side end surface and the second long side end surface.

The following describes how to implement the wooden straw of the present invention based on the examples.

A wooden straw according to an embodiment of the present invention will be described with reference to Figs. 1 to 5. In the following, the left front side of Fig. 1(a) and the front side of Fig. 3(a) are considered to be the front side, and the top, bottom, left, right, front and rear directions when viewed from the front side will be used as the basis for the description.

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 from wood into a roughly semi-cylindrical shape. 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 with a resin material R to form a roughly cylindrical shape.

As shown in FIG. 3(a), the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed in approximately 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 approximately 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.

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, with a radial plate thickness dimension L1 of approximately 1 to 5 mm. In addition, 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.

In this way, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B have an approximately semi-cylindrical shape, like a perfectly circular cylinder divided into two along a central axis that faces the longitudinal direction.

Next, an example of a process for manufacturing multiple wooden straws 1 will be described with reference to Figures 2(a) to (e). Note that the manufacturing method for wooden straws 1 is not limited to the method described below, and various other manufacturing methods are also possible.

As shown in FIG. 2(a), the first wooden piece 4 is a board made by processing thinned coniferous wood into a rectangular shape in plan view with 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 the first step S1, a plurality of grooves 4A (six rows in this embodiment) that are roughly semicircular in 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.

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 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, such as application using a brush or 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.

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

Next, in the third step S3, as shown in FIG. 2(c), the front 41 and back of the first wood 4 are aligned so that they are flush with the front 51 and back of the second wood 5, and similarly the left side 42 and right side 43 of the first wood 4 are aligned so that they are flush with the left side 52 and right side 53 of the second wood 5. The first wood 4 and the second wood 5 are then positioned so that the grooves 4A and 5A and the edges 44A and 54A of the first wood 4 and the edges 54A of the second wood 5 are butted together, so that the edges 44A and 54A of the first wood 4 and the second wood 5 are bonded together via the resin material R, and the first wood 4 and the second wood 5 are integrated by being fixed until the resin material R hardens.

In this embodiment, the first wooden piece 4 and the second wooden piece 5 are formed to have the same shape, so they 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 are formed at equal intervals, and the pieces are positioned so that the grooves 4A and 5A and the edges 44A and 54A of the first wooden piece 4 and the second wooden piece 5 are butted up against each other.

Next, in step S4, as shown in Fig. 2(d), the first wooden piece 4 and the second wooden piece 5 integrated with the resin material R are fed into a cutting machine (not shown) from the front 41, 51 side. 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 the two-dot chain line in Fig. 2(d)) are cut, and the outer peripheral surface 12 of each first semi-cylindrical member 1A and the outer peripheral surface 22 of each second semi-cylindrical member 1B are formed. In addition, the edges 44A, 54A adjacent to each groove 4A, 5A and the resin material R interposed between the edges 44A and 54A are cut away except for the portions corresponding to the plate thicknesses of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B, forming six wooden straws 1 as shown in FIG. 2(e).

In this way, through the above-mentioned first step S1 to fourth step S4, a plurality of wooden straws 1 (six in this embodiment) that are roughly cylindrical in front view (longitudinal cross section) and made of the first semi-cylindrical member 1A, the second semi-cylindrical member 1B, and the resin material R are formed, as shown in FIG. 2(e).

As shown in FIG. 3(a), the wooden straw 1 manufactured by the above-mentioned manufacturing process has a resin layer R1 formed along the length 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, and a resin layer R2 formed along the length 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. Since the two resin layers, which are stronger than wood, function as reinforcing materials, the strength of the wooden straw 1 against bending is improved. In addition, the resin layers R1 and R2 effectively 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.

As shown in Figures 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.

In addition, by forming a 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 on the outer surface of the wooden straw 1 that does not correspond to the resin layers R1, R2, the strength against pressure applied radially from the outer periphery is improved, making it 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 the same time. 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 external force is distributed over the entire longitudinal end surface of the inner surfaces 11, 21, so the strength against pressure applied radially from the outer periphery is further improved.

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 made of wood and formed into a roughly semi-cylindrical shape. The first semi-cylindrical member 1A is formed into a cylindrical shape having a predetermined length by butting together the first left longitudinal end face 15 and the first right longitudinal end face 16 as the two first longitudinal end faces extending in the longitudinal direction of the first semi-cylindrical member 1A and the second left longitudinal end face 25 and the second right longitudinal end face 26 as the two second longitudinal end faces extending in the longitudinal direction of the second semi-cylindrical member 1B. 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.

In this way, when the first semi-cylindrical member 1A and the second semi-cylindrical member 1B, which are thin-walled wooden members, are formed into a cylindrical shape, the two resin layers extending longitudinally between the first left longitudinal end face 15 and the first right longitudinal end face 16 and the second left longitudinal end face 25 and the second right longitudinal end face 26 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 the product are favorably improved.

In addition, 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, improving the strength of the outer peripheral surfaces 12, 22 against external forces, 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 dimension L1, making it easier to manufacture small-diameter wooden straws 1.

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

In addition, the resin layers R1, R2 and the inner peripheral resin layer R3 are formed from the same type of resin material, which makes manufacturing easier and improves the strength when integrated, since the two resin layers can be formed from the same type of resin material. Note that the resin layers R1, R2 and the inner peripheral resin layer R3 may be formed from different resin materials.

In addition, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed into a semi-cylindrical shape by cutting wood, which improves the strength and appearance and feel compared to when the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed by connecting multiple rods.

The first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed from a first piece of wood 4 and a second piece of wood 5, which are made by processing thinned coniferous wood into a rectangular shape in plan view with a specified thickness. Due to the unevenness caused by the grain of wood, some parts of the periphery are thinner than the rest of the periphery, and some holes are formed due to knots. Resin material R is applied to these parts to form an inner periphery resin layer R3 for reinforcement, preventing liquid leakage.

In addition, a method for manufacturing a wooden straw 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 the edges on both sides 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 their respective 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 that extend longitudinally between the first left longitudinal end face 15 and the first right longitudinal end face 16 of the first semi-cylindrical member 1A, which is made of thin wood, and the second left longitudinal end face 25 and the second right longitudinal end face 26 of the second semi-cylindrical member 1B function as reinforcing materials and improve strength, making the straw 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. It also makes it easier to manufacture wooden straws 1 that are thin but strong.

In this embodiment, six wooden straws are produced, but the present invention is not limited to this. 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 formed by a method other than the above steps and bonded together via the resin layers R1 and R2.

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

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 diameter of the wooden straw 1 in the left-right direction, 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 are inclined downward with respect to the diameter of the wooden straw 1.

In this way, 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 diametric direction, and the joint ends of the first semi-cylindrical member 1A and the second semi-cylindrical member 1B overlap in the radial direction, providing high durability against diametric shear forces.

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 are symmetrically inclined surfaces, but the left inclined surfaces of the first left longitudinal end face 15 and the second left longitudinal end face 25 and the right 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.

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 in 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 in 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.

In this way, the longitudinal end faces, i.e. the bonding area, can be increased without thickening the first semi-cylindrical member 1A or the second semi-cylindrical member 1B, allowing for 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. As 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, durability against diametric shear forces is increased. In addition, because 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 acting on the end faces is dispersed by the arc surface, which makes it possible to prevent damage to the arc-shaped joint ends machined into the thin-walled first semi-cylindrical member 1A and second semi-cylindrical member 1B.

Also, as in the wooden straw 100C shown in FIG. 5(a), convex strips 15a, 16a may be formed along the longitudinal direction on the right side 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 strips 25a, 26a may be formed along the longitudinal direction on the right side 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 strips 15a, 16a fit into the concave strips 25a, 26a.

In this way, the longitudinal end faces, i.e., the bonding area, can be increased without thickening the first semi-cylindrical member 1A or the second semi-cylindrical member 1B, allowing for strong bonding. In addition, the convex ridges 15a, 16a and the concave ridges 25a, 26a fit together circumferentially, so that the first left longitudinal end face 15 and the second left longitudinal end face 25 overlap with the first right longitudinal end face 16 and the second right longitudinal end face 26 in the radial direction, providing high durability against shear forces in the radial direction.

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.

By doing this, the longitudinal end surface, i.e., the bonding area, can be increased without thickening the first semi-cylindrical member 1A or the second semi-cylindrical member 1B, allowing for strong bonding. In addition, the convex ridges 15a, 16b and the concave ridges 25a, 26b fit together symmetrically in the circumferential direction, 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.

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.

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 and inner peripheral shapes of the wooden straw 1 are not limited to a perfect circle but can be arbitrarily deformed, and the outer and inner peripheral shapes when viewed from one end side in the longitudinal direction (the front and back sides in this embodiment) may be circular, elliptical, polygonal, star-shaped, etc. The outer and inner peripheral shapes may be different shapes.

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 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).

In the above embodiment, a resin layer R1 is formed in 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 in 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 peripheral resin layer R3 is formed in the longitudinal direction on the inner peripheral surface 11 of the first semi-cylindrical member 1A and the inner peripheral 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 the resin layers R1 and R2 are formed, and the inner peripheral resin layer R3 does not have to be formed.

In the above embodiment, the resin layer R1, the resin layer R2, and the inner periphery 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. The resin layer R1, the resin layer R2, and the inner periphery 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 periphery resin layer R3 may be formed from the same resin material.

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 they 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, an adhesive resin material 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. The water-repellent resin material has a lower viscosity than the adhesive resin material, so it easily permeates from the surface of the porous wood toward the inside, and adheres to the wood over a wide surface area. By adhering 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 are 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.

In addition, in the cutting process, the first wooden piece 4 and the second wooden piece 5 are arranged so that their grooves 4A and 5A face each other, and are integrated with the resin material R before the cutting process is performed. However, this is not limited to this, and a cylindrical body having approximately the same shape as the approximately cylindrical space formed between the grooves 4A and 5A may be placed as a temporary core, and the temporary core may be removed after the cutting process.

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.

In the above embodiment, 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. The first semi-cylindrical member 1A and the second semi-cylindrical member 1B may be formed by connecting multiple wooden bars, or may be formed by bending a single plate material.

In the above embodiment, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed by cutting wood with a cutting machine, but the present invention is not limited to this, and the lower surface 45 of the first wood piece 4 and the lower surface 55 of the second wood piece 5 may be cut with a router or the like.

In the above embodiment, the first semi-cylindrical member 1A and the second semi-cylindrical member 1B are formed from thinned coniferous wood, but the present invention is not limited to this. The first semi-cylindrical member 1A and the second semi-cylindrical member 1B may be formed from thinned broadleaf wood, laminated lumber made of wood powder or bamboo powder, or wood other than thinned wood.

1 Wooden straw 1A First semi-cylindrical member (first cylindrical member)
1B Second semi-cylindrical member (second cylindrical member)
4 First wood 4A, 5A Concave groove 5 Second wood 15 First left longitudinal end surface (longitudinal end surface)
15a Convex strip (convex portion)
16 First right longitudinal end surface (longitudinal end surface)
16a Convex strip (convex portion)
25 Second left longitudinal end surface (longitudinal end surface)
25a Concave stripe (recess)
26 Second right longitudinal end surface (longitudinal end surface)
26a Concave stripe (recess)
100A-D Wooden straw R1, R2 Resin layer R3 Inner circumference resin layer

Claims (8)

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. The wooden straw according to claim 1, characterized in that 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. The wooden straw according to claim 2, characterized in that the resin layer and the inner peripheral resin layer are integrally formed. The wooden straw according to claim 2 or 3, characterized in that the resin layer and the inner peripheral resin layer are made of the same type of resin material. 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. 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 the diameter of the wooden straw. A wooden straw according to any one of claims 1 to 5, characterized in that a convex portion is formed along the length of 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 length of the other of the two longitudinal end faces. 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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