JP2020092746A - Paper-made drinking straw - Google Patents

Abstract

To provide a paper-made drinking straw capable of being easily discarded and recycled, capable of being carried, conveyed and displayed in a compact state at non-use, and easily and surely assembled at use, and further suitable for being attached to a drinking container.SOLUTION: A multistage paper-made drinking straw comprises a large diameter cylinder 2 formed of a paper base material, and a small diameter cylinder 3 having an outer diameter smaller than an inner diameter of the large diameter cylinder, and is connected by inserting an end part 5 of the small diameter cylinder 3 into an end part 4 of the large diameter cylinder 2. The inner peripheral surface of the large diameter cylinder 2 is formed with spiral groove parts 7 at a constant pitch in the axial direction, and the outer peripheral surface of the small diameter cylinder 3 is formed with spiral projections 9 at a constant pitch in the axial direction, and the spiral projections 9 of the small diameter cylinder 3 can be screw-fitted with the spiral groove parts 7 of the large diameter cylinder 2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a paper drinking straw used when drinking liquid food or the like from a container.

BACKGROUND ART Drinking straws are often used as tools for sucking liquid foods (hereinafter referred to as beverages) contained in containers such as cups. Traditionally, most drinking straws are made of plastic. However, in recent years, problems such as environmental pollution due to dust from plastic products have come to be widely taken up, and as one of means for solving such problems, products manufactured from materials that can be easily discarded or recycled instead of plastic are used in various fields. Is required in.

Drinking straws are also required to be made of materials that can be easily discarded or recycled instead of plastic, and paper-made drinking straws have been proposed as such drinking straws.
Conventionally, as a drinking straw made of paper, water-resistant paper having water resistance in which plastic films are laminated on both sides of a paper base material is cut into a predetermined shape, and the cut paper having the predetermined shape is rolled as it is to form a straw. It is disclosed that a tubular body is formed by molding and joining the joint ends by thermocompression bonding (see, for example, Patent Document 1).

JP, 2009-233348, A

In recent years, it has become possible to sell with a straw attached to the drinking container, such as by releasably attaching it to the outer surface of the drinking container so that the beverage can be easily sucked from the drinking container containing the beverage. It is widely practiced.
In such a case, if the straw attached to the drinking container projects beyond the outer shape of the attached drinking container, it becomes an obstacle for carrying, carrying, displaying, etc., which is not desirable. However, if the length does not exceed the outer shape of the drinking container, the length of the straw will be insufficient and it will be difficult to reach the tip of the drinking container to the bottom of the drinking container. Also, even if the tip reaches the bottom of the drinking container, the mouth part (the part of the drinking container of the straw) is short and difficult to drink.

In addition, it is possible to set the straw so that it does not stick out of the container by bending the straw, but the bending part of the straw is plastically deformed and the shape of the straw becomes distorted, and the strength becomes low and the drinking container There is a problem in that the film for covering the straw mouth formed in the above is pierced and cannot be broken, and the suction of beverages is hindered.

The object of the present invention is to easily dispose of or recycle, and when it is not in use, it can be carried, transported, displayed, etc. in a compact state, and can be easily and surely assembled in use, and can be drunk. (EN) A paper drinking straw suitable for being attached to a container.

In order to achieve the above-mentioned object, the invention according to claim 1 has a large-diameter cylinder formed of a paper base material and a small-diameter cylinder formed of a paper base material and having an outer diameter smaller than the inner diameter of the large-diameter cylinder. A multi-stage paper drinking straw comprising a tube and connecting the end of the small diameter tube to the end of the large diameter tube, wherein the inner peripheral surface of the large diameter tube has an axial direction. A spiral groove portion having a constant pitch is formed, a spiral protrusion portion having a constant pitch is formed in the axial direction on the outer peripheral surface of the small diameter cylinder, and the spiral protrusion portion of the small diameter cylinder is screwed into the spiral groove portion of the large diameter cylinder. It is characterized in that it can be fitted.

According to the invention described in claim 1, the large-diameter cylinder formed of the paper base material and the small-diameter cylinder formed of the paper base material and having an outer diameter smaller than the inner diameter of the large-diameter cylinder are provided. A multi-stage paper drinking straw in which the end of the small-diameter cylinder is inserted and connected to the end of the large-diameter cylinder, and a spiral groove portion having a constant pitch in the axial direction is formed on the inner peripheral surface of the large-diameter cylinder. On the outer peripheral surface of the small diameter cylinder, a spiral protrusion with a constant pitch is formed in the axial direction, and the spiral protrusion of the small diameter cylinder can be screw-fitted into the spiral groove of the large diameter cylinder. At times, the drinking straw made of paper can be carried, conveyed, displayed, etc. in a state where the large-diameter cylinder and the small-diameter cylinder are separated, and when in use, the small-diameter cylinder is placed in the spiral groove portion of the large-diameter cylinder. By connecting the spiral protrusions with each other by screw-fitting, the paper drinking straw can be easily and reliably assembled.

According to a second aspect of the present invention, the inclination angle of the spiral groove portion formed on the inner peripheral surface of the large-diameter cylinder with respect to the axial direction and the spiral protrusion formed on the outer peripheral surface of the small-diameter cylinder according to the first aspect are described. The inclination angle of the part with respect to the axial direction is slightly different from each other.

According to the invention described in claim 2, with respect to the axial direction of the spiral groove portion formed on the inner peripheral surface of the large-diameter cylinder and the axial direction of the spiral protrusion formed on the outer peripheral surface of the small-diameter cylinder. Since the inclination angle and the inclination angle are formed so as to be slightly different from each other, when the spiral projection portion of the small diameter cylinder is screwed into the spiral groove portion of the large diameter cylinder, With the advance of the small-diameter cylinder, the contact between the groove wall of the spiral groove portion and the protruding wall of the spiral protrusion that are meshed with each other gradually strengthens and becomes a pressure contact state to prevent further progress, and the assembled paper drink It is possible to prevent a situation in which the length of the straw is shortened more than necessary, and it is possible to strongly connect the fitting portion of the large diameter cylinder and the small diameter cylinder.

According to the invention of claim 3, in the large-diameter cylinder having the spiral groove portion formed on the inner peripheral surface thereof according to claim 1 or 2, the inner peripheral surface of the large-diameter cylindrical base body is made of a paper base material. The formed band-shaped members are spirally bonded to each other with a gap in the axial direction, the spiral groove portions are formed between the band-shaped members located above and below, and the spiral protrusion is formed on the outer peripheral surface. In the small-diameter cylinder base, a belt-shaped member formed of a paper base material on the outer peripheral surface of the small-diameter cylinder base and having the same width or a narrow width as the spiral groove portion is axially bonded and is spirally bonded to form a small-diameter cylinder base. It is characterized in that the spiral projection is formed by the band-shaped member bonded to the outer peripheral surface.

According to the invention of claim 3, in the large-diameter cylinder in which the spiral groove portion is formed on the inner peripheral surface, a belt-shaped member formed of a paper base material is formed on the inner peripheral surface of the large-diameter cylindrical base body. Glued in a spiral shape with a gap in the direction, forming the spiral groove portion between the belt-shaped members positioned above and below, and in the small diameter cylinder having the spiral protrusion formed on the outer peripheral surface, The strip-shaped members, which are formed from a paper base material on the outer peripheral surface of the small-diameter tubular base, are spirally adhered to each other in the axial direction with a width or a narrow width of the spiral groove portion, and are adhered to the outer peripheral surface of the small-diameter tubular base. Since the spiral protrusion is formed of a member, it is possible to easily and reliably manufacture the large diameter cylinder having the spiral groove portion formed on the inner peripheral surface and the small diameter cylinder having the spiral protrusion formed on the outer peripheral surface. You can

According to the invention of claim 4, in the large-diameter cylinder having the spiral groove portion formed on the inner peripheral surface thereof according to claim 1 or 2, a strip-shaped member formed of a paper base material is spirally formed. A large-diameter cylinder is formed by winding the spiral-groove portion on the inner peripheral surface of the large-diameter cylinder, and the spiral groove portion is formed on the outer peripheral surface by a step portion depending on the thickness of the overlapping edge of the strip-shaped member. In the small-diameter cylinder, a small-diameter cylinder is formed by spirally winding a strip-shaped member formed of a paper base material, and a step portion is formed on the outer peripheral surface of the small-diameter cylinder depending on the thickness of the overlapping edge of the strip-shaped member. It is characterized in that the spiral protrusion is formed.

According to the invention of claim 4, in the large diameter cylinder having the spiral groove portion formed on the inner peripheral surface thereof, a belt-shaped member formed of a paper base material is spirally wound to form a large diameter cylinder. In the small diameter cylinder in which the spiral groove portion is formed by a step portion depending on the thickness of the overlapping edge of the strip-shaped member that appears on the inner peripheral surface of the large diameter cylinder and the spiral protrusion is formed on the outer peripheral surface, Is a small-diameter cylinder formed by spirally winding the strip-shaped member formed of a paper base material, and the spiral protrusion is a stepped portion depending on the thickness of the overlapping edge of the strip-shaped members that appears on the outer peripheral surface of the small-diameter cylinder. Therefore, it is possible to reliably manufacture the large diameter cylinder having the spiral groove portion formed on the inner peripheral surface and the small diameter cylinder having the spiral protrusion formed on the outer peripheral surface. Each of the cylinders has good workability because it is manufactured by a simple process such as winding a belt-shaped member in a spiral shape.
Further, since the large-diameter cylinder and the small-diameter cylinder are manufactured by spirally winding the strip-shaped members, it is possible to manufacture a long-sized large-diameter cylindrical member and a small-diameter cylindrical member by continuing the winding. Since the large-diameter cylinder member and the small-diameter cylinder member can be cut to obtain the large-diameter cylinder and the small-diameter cylinder having a predetermined length, it is suitable for mass production and the manufacturing cost can be reduced.

As described above, according to the paper drinking straw according to the present invention, it is possible to easily dispose or recycle, and when not in use, the paper drinking straw is separated from the large-diameter cylinder and the small-diameter cylinder. It can be carried, transported, displayed, etc., and at the time of use, the spiral protrusion of a small diameter tube is screw-fitted into the spiral groove of a large diameter tube to connect it, so that a paper drinking straw can be assembled easily and reliably. It is possible to obtain a paper drinking straw suitable for attachment to a drinking container.

1 is a front view showing a first example of an embodiment of a paper drinking straw according to the present invention. It is a partial cross-section explanatory drawing which shows the state which the large diameter cylinder and the small diameter cylinder of the paper drinking straw shown in FIG. 1 were isolate|separated. It is a development view of the large diameter cylinder shown in FIG. It is explanatory drawing which shows the formation process of the small diameter cylinder shown in FIG. It is a front view which shows the 2nd example of embodiment of the paper drinking straw which concerns on this invention. FIG. 5 is a partial cross-sectional explanatory view showing a state in which the large diameter cylinder and the small diameter cylinder of the paper drinking straw shown in FIG. 4 are separated. It is a top view which shows the strip-shaped member which forms the large diameter cylinder shown in FIG.

Hereinafter, an embodiment of a paper drinking straw according to the present invention will be described in detail with reference to the drawings.
1 to 4 show a first example of an embodiment of a paper drinking straw according to the present invention. FIG. 1 is a front view of the paper drinking straw of the first example, and FIG. 2 is shown in FIG. FIG. 3 is a partial cross-sectional explanatory view showing a state where the large diameter cylinder and the small diameter cylinder of the paper drinking straw are separated, FIG. 3 is a development view of the large diameter cylinder shown in FIG. 2, and FIG. 4 is a process of forming the small diameter cylinder shown in FIG. FIG.
Is.

As shown in FIGS. 1 and 2, the paper drinking straw 1 of the first example has a large diameter tube 2 formed of a paper base material and an outer diameter larger than the inner diameter of the large diameter tube 2 formed of the paper base material. Is a multi-stage paper drinking straw in which the end 5 of the small diameter tube 3 is inserted into the end 4 of the large diameter tube 2 and connected.

The paper base material forming the large diameter cylinder 2 and the small diameter cylinder 3 is not particularly limited as long as it is a paper sheet having water resistance, but in order to facilitate disposal and recycling, for example, paraffin, beeswax, persimmon astringent, silicone. Resin, fluororesin, rosin-based sizing agent, alkyl ketene dimer (AKD), water-proofing agent such as wet paper strength agent are applied, impregnated, printed or contained on the base paper, and laminated with plastic film etc. Those that do not are preferably used.

The large-diameter cylinder 2 has a spiral groove portion 7 with a constant pitch in the axial direction formed on its inner peripheral surface 6, and the small-diameter cylinder 3 has a spiral protrusion 9 with a constant pitch in the axial direction on its outer peripheral surface 8. It is formed so that the spiral groove portion 7 of the large diameter cylinder 2 can be screw-fitted with the spiral protrusion 9 of the small diameter cylinder 3.

The inclination angle Q1 of the spiral groove portion 7 formed on the inner peripheral surface 6 of the large diameter cylinder 2 and the inclination angle Q2 of the spiral protrusion 9 formed on the outer peripheral surface 8 of the small diameter cylinder 3 are the same as the spiral groove portion 7 and the spiral groove portion 7. The protrusion 9 is not particularly limited as long as it can be screw-fitted, and the inclination angle Q1 and the inclination angle Q2 may be formed with the same angle, or may be formed with a slight difference. In the first example, the inclination angles Q1 and Q2 are formed with a slight difference.
When the inclination angle Q1 of the spiral groove portion 7 formed on the inner peripheral surface 6 of the large diameter cylinder 2 and the inclination angle Q2 of the spiral protrusion 9 formed on the outer peripheral surface 8 of the small diameter cylinder 3 are formed with a slight difference, When the spiral protrusion 9 of the small-diameter cylinder 3 is screw-fitted into the spiral groove portion 7 of the large-diameter cylinder 2, the groove wall 7a of the spiral groove portion 7 and the spiral groove portion 7 that mesh with the spiral-groove portion 9 of the small-diameter cylinder 3 are advanced as the small-diameter cylinder 3 advances into the large-diameter cylinder 2. It is possible to prevent a situation in which the contact of the projecting wall 9a of the projecting portion 9 gradually increases and becomes a pressure contact state to prevent further progress, and the length of the assembled paper drinking straw becomes shorter than necessary. . Further, the fitting portion between the large diameter cylinder 2 and the small diameter cylinder 3 is in a strongly connected state.

Further, in the first example, the width W1 of the spiral protrusion 9 on the outer peripheral surface 8 of the small diameter cylinder 3 is slightly narrower than the width W2 of the spiral groove portion 7 on the inner peripheral surface of the large diameter cylinder 2.
By doing so, there is a difference between the inclination angle Q1 of the spiral groove portion 7 formed on the inner peripheral surface 6 of the large diameter cylinder 2 and the inclination angle Q2 of the spiral protrusion 9 formed on the outer peripheral surface 8 of the small diameter cylinder 3. Also, until the protruding wall 9a of the spiral protrusion 9 of the small diameter cylinder 3 is pressed against the groove wall 7a of the spiral groove portion 7 formed on the inner peripheral surface 6 of the large diameter cylinder 2, the small diameter cylinder 3 is inserted into the spiral groove portion 7 of the large diameter cylinder 2. It is possible to fit the spiral projecting portion 9 of FIG.

In the large-diameter cylinder 2 in which the spiral groove portion 7 is formed on the inner peripheral surface 6, the strip-shaped member 11 formed of the paper base material is provided on the inner peripheral surface 6 of the large-diameter cylinder base body 10 formed of the paper base material. The spiral groove portions 7 are formed between the strip-shaped members 11 that are present above and below, and are bonded in a spiral shape with a gap in the axial direction.

In the first example, in the large-diameter cylinder 2, one side of the long rectangular large-diameter cylindrical base sheet material 12 forming the large-diameter cylindrical base body 10 is provided with the long side of the large-diameter cylindrical base sheet material 12. An adhesive margin 13 is provided on one edge 12a in the direction, and the strip-shaped member 11 is bonded at a predetermined pitch in the axial direction with an inclination angle that is the inclination angle of the spiral groove portion 7 (see FIG. 3), and the strip-shaped member 11 is formed. The bonded surface is curved with the inner surface being the inner side, and the adhesive margin 13 of one edge portion 12a in the longitudinal direction of the large-diameter tubular base sheet material 12 is the other edge portion 12b, and the upper belt-shaped member of the belt-shaped member 11 positioned above and below. The large-diameter tubular base body 10 is formed by laminating one end 11a (right side in FIG. 3) 11 and the other end 11b (lower side in FIG. 3) of the lower strip-shaped member 11 so as to be joined. The spiral groove portion 7 is formed between the strip-shaped members 11 located above and below.

In the small-diameter cylinder 3 in which the spiral projection 9 is formed on the outer peripheral surface 8, the paper base is formed on the outer peripheral surface 8 of the small-diameter cylindrical base body 14 formed of a paper base material and having an outer diameter smaller than the inner diameter of the large-diameter cylinder 2. A band-shaped member 15 formed of a material is spirally adhered to the spiral groove portion 7 of the large-diameter cylinder 2 in such a manner that the band-shaped member 15 is spirally adhered to the outer peripheral surface 8 of the small-diameter cylinder base 14 with a gap in the axial direction. The spiral projection 9 that can be screwed is formed (see FIG. 4).

According to the paper drinking straw 1 of the first example configured as described above, the spiral groove portions 7 having a constant pitch in the axial direction are formed on the inner peripheral surface 6 of the large diameter cylinder 2 and the outer peripheral surface of the small diameter cylinder 3. 8 is formed with a spiral projection 9 having a constant pitch in the axial direction, and the spiral projection 9 of the small-diameter cylinder 3 can be screw-fitted into the spiral groove 7 of the large-diameter cylinder 2. The drinking straw 1 can be carried, transported, displayed, etc. in a state in which the large-diameter cylinder 2 and the small-diameter cylinder 3 are separated and made compact, and the spiral groove portion 7 of the large-diameter cylinder 2 is used to spiral the small-diameter cylinder 3 in use. The paper drinking straws 1 can be assembled easily and reliably by connecting the protrusions 9 by screwing them together.

Further, in the first example, the inclination angle Q1 of the spiral groove portion 7 formed on the inner peripheral surface 6 of the large diameter cylinder 2 with respect to the axial direction and the inclination angle of the spiral protrusion 9 formed on the outer peripheral surface 8 of the small diameter cylinder 3 with respect to the axial direction. Since the angle Q2 and the angle Q2 are formed slightly different from each other, when the spiral protrusion 9 of the small diameter cylinder 3 is screwed into the spiral groove portion 7 of the large diameter cylinder 2, As the small-diameter cylinder 3 advances, the contact between the meshing groove wall 7a of the spiral groove part 7 and the projecting wall 9a of the spiral projection 9 gradually becomes stronger and becomes a pressure contact state, and further progress is prevented, and the assembly is completed. It is possible to prevent a situation in which the length of the paper drinking straw 1 becomes unnecessarily short, and the fitting portion of the large diameter tube 2 and the small diameter tube 3 can be strongly connected.

Further, in the first example, the width W1 of the spiral projection 9 on the outer peripheral surface 8 of the small diameter cylinder 3 is slightly narrower than the width W2 of the spiral groove portion 7 on the inner peripheral surface 6 of the large diameter cylinder 2. Even if there is a difference between the inclination angle Q1 of the spiral groove portion 7 formed on the inner peripheral surface 6 of the large diameter cylinder 2 and the inclination angle Q2 of the spiral protrusion 9 formed on the outer peripheral surface 8 of the small diameter cylinder 3, Until the protruding wall 9a of the spiral protruding portion 9 of the small diameter cylinder 3 is pressed against the groove wall 7a of the spiral groove portion 7 formed on the inner peripheral surface 6 of the cylinder 2, the spiral protruding portion of the small diameter cylinder 3 is inserted into the spiral groove portion 7 of the large diameter cylinder 2. It is possible to fit the screw 9 with the screw without difficulty.

Further, in the first example, in the large-diameter cylinder 2 in which the spiral groove portion 7 is formed on the inner peripheral surface 6, the belt-shaped member 11 formed of a paper base material is axially formed on the inner peripheral surface of the large-diameter cylindrical base body 10. In the small diameter cylinder 3 in which the spiral groove portion 7 is formed between the belt-shaped members 11 located above and below, and the spiral protrusion 9 is formed on the outer peripheral surface 8, A band-shaped member 15 formed of a paper base material and having the same width or a narrow width as that of the spiral groove portion 7 is adhered to the outer peripheral surface of the small-diameter tubular base 14 in a spiral shape with a gap in the axial direction. Since the spiral projection 9 is formed by the strip-shaped member 15, the large-diameter cylinder 2 having the spiral groove portion 7 formed on the inner peripheral surface 6 and the small-diameter cylinder 3 having the spiral projection 9 formed on the outer peripheral surface 8 can be easily formed. It can be reliably manufactured.

5 to 7 show a second example of the embodiment of the paper drinking straw according to the present invention. FIG. 5 is a front view of the paper drinking straw of the second example, and FIG. 6 is shown in FIG. FIG. 7 is a partial cross-sectional explanatory view showing a state in which the large diameter cylinder and the small diameter cylinder of the paper drinking straw shown are separated, and FIG. 7 is a plan view showing a strip-shaped member forming the large diameter cylinder shown in FIG.
With respect to the paper drinking straw 1 of the second example, the same components as those in the first example are designated by the same reference numerals, and the description thereof will be omitted. Only configurations different from the first example will be described.

As shown in FIGS. 5 and 6, the paper drinking straw 1 of the second example has a large diameter tube 2 formed of a paper base material and a large diameter tube 2 formed of a paper base material as in the first example. Is a multi-stage paper drinking straw in which the outer diameter is smaller than the inner diameter of the small diameter tube 3 and the end portion 5 of the small diameter tube 3 is inserted into and connected to the end portion 4 of the large diameter tube 2. The large-diameter cylinder 2 has a spiral groove portion 7 with a constant pitch in the axial direction formed on the inner peripheral surface 6, and the small-diameter cylinder 3 has a spiral protrusion 9 with a constant pitch in the axial direction formed on the outer peripheral surface 8. The spiral projection 9 of the small diameter cylinder 3 can be screwed into the spiral groove 7 of the large diameter cylinder 2.

In the large-diameter cylinder 2 in which the spiral groove portion 7 is formed on the inner peripheral surface 6, as shown in FIG. 7, a belt-shaped member formed of a paper base material and provided with a margin 17 at one edge portion 16 in the width direction. It is formed by winding 18 in a spiral shape. Specifically, the other edge portion 19 of the strip-shaped member 18 in the width direction is wound around the one edge portion 16 along the glue margin 17 and bonded to form a large-diameter tube 2. Then, the spiral groove portion 7 is formed by a concave portion formed between the step portion formed by the thickness of the overlapping edge 20 of the strip-shaped member 18 appearing on the inner peripheral surface 6 of the large-diameter cylinder 2 and the strip-shaped member 18 overlapping the upper portion of the step portion. Is forming.

Further, in the small-diameter cylinder 3 in which the spiral groove portion 9 is formed on the outer peripheral surface 8, like the large-diameter cylinder 2, although not shown, the small-diameter cylinder 3 is formed of a paper base material and has a glue margin 22 at one edge 21 in the width direction. It is formed by spirally winding the band-shaped member 23 provided with. More specifically, the other edge portion 24 of the strip-shaped member 23 in the width direction is wound around the one edge portion 21 along the glue margin 22 and adhered into a tubular shape to form the small diameter tube 3. Then, the step portion formed by the thickness of the overlapping edge 25 of the belt-shaped member 23 appearing on the outer peripheral surface 8 of the small diameter cylinder 3 becomes a convex portion to form the spiral protrusion 9.
The other configurations are similar to those of the first example, and thus the description is cited and omitted.

According to the paper drinking straw 1 of the second example configured in this way, in the large-diameter cylinder 2 having the spiral groove portion 7 formed on the inner peripheral surface 6, the strip-shaped member 18 formed of a paper base material is used. The large-diameter cylinder 2 is spirally wound to form the large-diameter cylinder 2, and the spiral groove portion 7 is formed by a step portion depending on the thickness of the overlapping edge 20 of the strip-shaped member 18 appearing on the inner peripheral surface 6 of the large-diameter cylinder 2 and the outer peripheral surface 8 In the small-diameter cylinder 3 having the spiral protrusion 9 formed therein, the strip-shaped member 23 formed of a paper base material is spirally wound to form the small-diameter cylinder 3, and the strip-shaped member 23 appearing on the outer peripheral surface 8 of the small-diameter cylinder 3. Since the spiral protrusion 9 is formed by the stepped portion depending on the thickness of the overlapping edge 25, the spiral protrusion 9 is formed on the large-diameter cylinder 2 having the spiral groove 7 formed on the inner peripheral surface 6 and the outer peripheral surface 8. The small-diameter cylinder 3 can be reliably manufactured, and both the large-diameter cylinder 2 and the small-diameter cylinder 3 can be manufactured by a simple process of spirally winding the belt-shaped members 18 and 23.

Further, since the large-diameter cylinder 2 and the small-diameter cylinder 3 are manufactured by spirally winding the strip-shaped members 18 and 23, it is possible to manufacture long large-diameter cylindrical members and small-diameter cylindrical members by continuing the winding. Since it is possible to obtain the large-diameter cylinder 2 and the small-diameter cylinder 3 having a predetermined length by cutting the long-sized large-diameter cylinder member and the small-diameter cylinder member, it is possible to achieve mass production and reduce the manufacturing cost.
The other effects are similar to those of the first example, and thus the description is cited and omitted.

1 Paper Drinking Straw 2 Large Diameter Cylinder 3 Small Diameter Cylinder 4 End of Large Diameter Cylinder 5 End of Small Diameter Cylinder 6 Inner Surface of Large Diameter Cylinder 7 Spiral Groove 7a Groove Wall 8 Outer Surface 9 of Small Diameter Cylinder Spiral Protrusion 9a Projection wall 10 Large-diameter tubular base 11 Band-shaped member 11a One edge 11b Other edge 12 Large-diameter tubular base sheet material 12a One edge 12b The other edge 13 Paste margin 14 Small-diameter tubular base 15 Band-shaped member 16 Band-shaped member One edge 17 in the width direction of (18) 17 Glue 18 Band-shaped member 19 The other edge 20 in the width direction of the band-shaped member (18) Overlapping edge 21 One edge 22 in the width direction of the band-shaped member (23) 23 Glue 23 Belt-shaped member 24 Edge 25 on the other side in the width direction of the belt-shaped member (23) Overlapping edge Q1 Angle of inclination of spiral groove Q2 Angle of inclination of spiral protrusion W1 Width of spiral protrusion W2 Width of spiral groove

Claims (4)

It consists of a large diameter cylinder formed of a paper base material and a small diameter cylinder formed of a paper base material and having an outer diameter smaller than the inner diameter of the large diameter cylinder, and the end of the small diameter cylinder is at the end of the large diameter cylinder. It is a multi-stage paper drinking straw that inserts and connects parts,
A spiral groove portion having a constant pitch in the axial direction is formed on the inner peripheral surface of the large diameter cylinder, and a spiral protrusion portion having a constant pitch in the axial direction is formed on the outer peripheral surface of the small diameter cylinder. A paper drinking straw, wherein the spiral protrusion of the small diameter cylinder can be screwed into the spiral groove. There is a slight difference between the inclination angle of the spiral groove portion formed on the inner peripheral surface of the large diameter cylinder with respect to the axial direction and the inclination angle of the spiral protrusion portion formed on the outer peripheral surface of the small diameter cylinder with respect to the axial direction. The paper drinking straw according to claim 1, wherein the drinking straw is formed by being attached. In the large-diameter cylinder having the spiral groove portion formed on the inner peripheral surface thereof, band-shaped members formed of a paper base material are spirally adhered to the inner peripheral surface of the large-diameter cylindrical base body with a gap in the axial direction. , The spiral groove portion is formed between the strip-shaped members located above and below,
Further, in the small-diameter cylinder having the spiral projection formed on the outer peripheral surface, a belt-shaped member formed of a paper base material on the outer peripheral surface of the small-diameter cylindrical base body and having the same width or a narrow width as the spiral groove portion is arranged in the axial direction. 3. The paper according to claim 1, wherein the spiral protrusion is formed by the strip-shaped member adhered to the outer peripheral surface of the small-diameter tubular base body with a space between the spiral projections. Drinking straws. In the large diameter cylinder having the spiral groove portion formed on the inner peripheral surface, a belt-shaped member formed of a paper base material is spirally wound to form a large diameter cylinder, which appears on the inner peripheral surface of the large diameter cylinder. The spiral groove portion is formed by a step portion depending on the thickness of the overlapping edge of the strip-shaped member,
In the small-diameter cylinder having the spiral projection formed on the outer peripheral surface, a belt-shaped member formed of a paper base material is spirally wound to form a small-diameter cylinder, and the overlap of the belt-shaped members appearing on the outer peripheral surface of the small-diameter cylinder. 3. The paper drinking straw according to claim 1, wherein the spiral protrusion is formed by a step portion depending on the thickness of the edge.

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