JP7363449B2 - multi-tier straw - Google Patents

Description

TECHNICAL FIELD The present invention relates to a straw used for drinking, and more particularly to an extendable and retractable multi-stage straw.

Conventional multi-tiered straws are mainly made of hard plastic, and among them, the multi-tiered straw shown in Patent Document 1 is known, which is compact before use and can be stretched when drinking. Since this multi-stage straw is attached to a limited area on the side of a beverage container, its length before use must be sufficiently short. In addition, since the drinker needs to put the straw in his or her mouth when drinking, a sufficient length is required, and this multi-stage straw has a sufficient length when extended.

Utility Model Publication No. 58-45483

The multi-stage straw of Patent Document 1 combines large diameter and small diameter cylindrical pipes, and by expanding one end surface of the small diameter pipe outward (expanded part), the small diameter is formed on the inner wall of the large diameter pipe. Since the enlarged part of the pipe is crimped, no air leakage occurs. In order to be properly pressure-welded, the large-diameter pipe and the small-diameter pipe must have sufficient rigidity. Furthermore, when the multistage straw is expanded or contracted, the enlarged portion of the small diameter pipe and the inner wall of the large diameter pipe slide while being pressed against each other, resulting in an increase in frictional force.

The present invention has been made in view of these circumstances, and aims to provide a multi-stage straw that allows small diameter pipes and small diameter pipes to have small rigidity, and that has less frictional force when expanding and contracting. purpose.

Note that from now on, the large diameter pipe will be referred to as the first pipe, and the small diameter pipe will be referred to as the second pipe.

The above problems can be solved by the following embodiments of the present invention.
That is, in the multi-stage straw 10 consisting of a first pipe 20 and a second pipe 30 inserted into the hollow part of the first pipe 20,
The first pipe 20 and the second pipe 30 have sides of an inverted truncated cone,
The outer diameter D3 of the large-diameter end 33 of the inverted truncated cone of the second pipe 30 is larger than the inner diameter d2 of the small-diameter end 22 of the inverted truncated cone of the first pipe 20;
Furthermore, the outer diameter D3 of the large-diameter end 33 of the inverted truncated cone of the second pipe 30 is smaller than the inner diameter d1 of the large-diameter end 23 of the inverted truncated cone of the first pipe 20. There is.

In the multi-stage straw 10 according to an embodiment of the present invention, the first pipe 20 and the second pipe 30 may have side surfaces of an inverted truncated cone having the same apex angle.

In the multi-stage straw 10 according to the embodiment of the present invention, the outer surface of the second pipe 30 near the large-diameter end 33 of the inverted truncated cone and the outer surface of the first pipe 20 on the small-diameter side of the inverted truncated cone The inner surface near the end portion 22 may be in contact with the inner surface of the side surface of the inverted truncated cone with a width of 5 mm or more and 50 mm or less across the ridge line direction.

In the multi-stage straw 10 of one embodiment of the present invention, the first pipe 20 and the second pipe 30 may be pipes formed by winding a sheet into a cylindrical shape.

In the multistage straw 10 of one embodiment of the present invention, the winding direction of the first pipe 20 and the winding direction of the second pipe 30 may be opposite directions.

In the multi-stage straw 10 according to an embodiment of the present invention, a pointed end 37 may be provided at the end 32 of the inverted truncated cone on the narrow diameter side of the body sticking part 34 of the second pipe 30.

In the multi-stage straw 10 according to an embodiment of the present invention, the first pipe 20 and/or the second pipe 30 are arranged at a cross section perpendicular to the central axis thereof in the longitudinal direction. The thickness of the second pipe 30 may be uniform.

In the multistage straw 10 of one embodiment of the present invention, a means for fixing the first pipe 20 and the second pipe 30 may be provided on the inner surface of the first pipe 20.

In the multi-stage straw of one embodiment of the present invention, means for fixing the first pipe 20 and the second pipe 30 may be provided on the outer surface of the second pipe 30.

In the multi-stage straw 10 according to an embodiment of the present invention, a means for preventing the second pipe 30 from falling off is provided at the large-diameter end 23 of the inverted truncated cone of the first pipe 20 or in the vicinity of the end 23. may be provided.

The multistage straw 10 of the present invention includes a first pipe 20 and a second pipe 30 inserted into the hollow part of the first pipe 20. In addition, when extending the multi-stage straw 10, the first pipe 20 and the second pipe 30 come into strong contact only in the final stage of extension, so that the first pipe 20 and the second pipe 30 are in contact with each other in the previous stage. Since they do not make strong contact, they can move smoothly without frictional resistance. Furthermore, since there is no resistance, the extension work of the multi-stage straw 10 can be completed without any damage to each pipe.

The multistage straw 10 of the present invention has less resistance due to friction during its extension operation, and therefore is less likely to be damaged. Furthermore, it is possible to provide a multi-stage straw 10 manufactured using a material with relatively low stiffness, which allows cost reduction.

FIG. 2 is a front view of the first embodiment. They are a parts diagram and a combination diagram of the first embodiment. It is a front view of a second embodiment. They are a parts diagram and a combination diagram of a second embodiment. It is a blank diagram of a fourth embodiment. It is an explanatory view of a fifth embodiment. (a) It is a sectional view of the overlap part of a prior art. (b) It is a sectional view of the overlap part of a fifth embodiment. It is a front view of a sixth embodiment. It is a blank diagram of a sixth embodiment. It is a parts diagram and a combination diagram of a seventh embodiment. It is a front view of an eighth embodiment. It is a front view of a ninth embodiment. It is a front view of a tenth embodiment. It is a front view of a modification of the tenth embodiment.

Embodiments of the present invention will be described below with reference to the drawings. However, the present invention is not limited to these specifically illustrated forms or various specifically described structures.
Note that in each figure, the sizes and proportions of members may be changed or exaggerated in order to make it easier to understand. Further, for ease of viewing, parts unnecessary for explanation or repetitive symbols may be omitted.

<First embodiment of the present invention>
The multistage straw 10 according to the first embodiment of the present invention will be described in detail below using the drawings and the like.

First, a multistage straw 10 according to a first embodiment will be described with reference to FIGS. 1 and 2.
FIG. 1 is a diagram of the multi-stage straw 10 of this embodiment at an extended stage. Furthermore, when explaining the positional relationship of the multi-stage straw 10, the vertical direction may be defined and explained as shown in FIG.

2, FIG. 2(a) is a drawing of the first pipe 20 as a single unit, and FIG. 2(b) is a drawing of the second pipe 30 as a single unit. FIG. 2(c) is a diagram of the multistage straw 10 before expansion.
The multistage straw 10 is made up of a combination of a first pipe 20 and a second pipe 30, and the second pipe 30 is inserted into the hollow part of the first pipe 20. The first pipe 20 and the second pipe 30 have side surfaces of an inverted truncated cone, and from the end 23 on the large diameter side of the inverted truncated cone of the first pipe 20, to the narrow diameter side of the inverted truncated cone of the second pipe 30. The end 32 of is inserted.

In FIG. 2, the lengths of the first pipe 20 and the second pipe 30 are approximately the same, but by doing so, the amount of expansion (length) of the multistage straw 10 from the time of contraction to the time of expansion can be efficiently controlled. can be secured.
Further, the first pipe 20 may be longer than the second pipe 30. Since the first pipe 20 is longer than the second pipe 30, the second pipe 30 can be easily accommodated in the hollow portion of the first pipe 20.

In the specification of the present invention, the larger diameter side of the inverted truncated cone of the multi-stage straw 10, which is a combination of the first pipe 20 and the second pipe 30, is held in the drinker's mouth, and the liquid is sucked out.

Further, in general drinking applications, liquid is sucked from the narrow diameter side of the inverted truncated cone of the multistage straw 10, which is made up of a combination of the first pipe 20 and the second pipe.

Further, the narrow end 32 of the multistage straw 10 is inserted into the liquid from the upper surface side of the liquid stored in the container, and the liquid is sucked upward through the multistage straw 10. Because of this usage, in FIG. 2, the small diameter side of the multi-stage straw 10 is shown at the bottom and the large diameter side is shown at the top, and each pipe 20, 30 is also shown as an inverted truncated cone.
Even if the vertical direction of FIG. 2 is reversed and each pipe 20, 30 becomes a truncated cone, the properties of the multistage straw 10 do not change. In the present invention, it is unified by calling it an inverted truncated cone.

Note that when using the multistage straw 10 of this embodiment, fluid (including powder) is generally sucked in from the small diameter side and discharged from the large diameter side, but depending on the application, the above-mentioned Contrary to the aspect described in 1, it is also possible that the fluid is sucked in from the large diameter side and discharged from the small diameter side, and the flow direction of the fluid may be either.

Since the first pipe 20 has an inverted truncated cone shape, the outer diameter D1 of its large diameter end 23 is larger than the outer diameter D2 of its narrow diameter end 22. Moreover, the inner diameter d1 of the end 23 on the larger diameter side is larger than the inner diameter d2 of the end 22 on the narrower diameter side.

Similarly, since the second pipe 30 has an inverted truncated cone shape, the outer diameter D3 of its large diameter end 33 is larger than the outer diameter D2 of its narrow diameter end 32. Moreover, the inner diameter d1 of the end 33 on the large diameter side is larger than the inner diameter d2 of the end 22 on the small diameter side.

Further, the outer diameter D3 of the large-diameter end 33 of the inverted truncated cone of the second pipe 30 is larger than the inner diameter d2 of the small-diameter end 22 of the inverted truncated cone of the first pipe 20. Further, the inner diameter d1 of the end 23 on the larger diameter side of the inverted truncated cone of the first pipe 20 is larger than the inner diameter d3 of the end 33 on the larger diameter side of the inverted truncated cone of the second pipe 30.
For this purpose, the second pipe 30 can be inserted into the hollow part of the first pipe 20. FIG. 2(c) shows a state in which the second pipe 30 is accommodated in the hollow portion of the first pipe 20.

A method for measuring the inner diameters of the first pipe 20 and the second pipe 30 will be explained. The first pipe 20 and the second pipe 30 have a side surface shape of an inverted truncated cone, and the apex angle α of the inverted truncated cone is assumed to be α. The apex angle α exists on the outside of the narrow diameter side of the inverted truncated cone.

A conical spindle gauge having the same apex angle as the apex angle α is prepared. The inner diameters are measured by inserting the spindle gauges into the larger diameter ends 23 and 33 of the first pipe 20 and the second pipe 30.
A scale is placed on the side of the spindle gauge in the direction of its ridgeline, and by reading and converting the scale, the inner diameter can be calculated.

A method for measuring the outer diameters of the first pipe 20 and the second pipe 30 will be explained. In the same way as measuring the inner diameter, insert the spindle gauge into the large-diameter ends 23 and 33 of the first pipe 20 and second pipe 30 to determine the shape of the first pipe 20 and second pipe 30 as a truncated cone. After adjusting the shape, measure the outer diameter with calipers, etc. When measuring, the position where the trunk attachment parts 24 and 34 are removed is measured.
Alternatively, after measuring the inner diameter, the thickness of the material may be measured and twice the thickness may be added to the inner diameter.

A method of measuring the outer diameter at an intermediate position between the first pipe 20 and the second pipe 30 will be described.
Prepare a spindle gauge having the same apex angle as the apex angle α of the inverted truncated cone of the first pipe 20 and the second pipe 30, and place the spindle gauge on the larger diameter side of the first pipe 20 and the second pipe 30. After adjusting the shapes of the first pipe 20 and the second pipe 30, the outer diameter at a predetermined location is measured.

In measuring the inner diameter and outer diameter above, if it is not possible to prepare a spindle gauge with the same size as the above-mentioned apex angle α, then Prepare a spindle gauge with a large apex angle, insert the spindle gauge into the first pipe 20 and the second pipe 30 from the large-diameter ends 23 and 33, and connect the first pipe 20 and the second pipe 30. After shaping the end into a circumferential shape, measure the inner and outer diameters at predetermined locations. At the time of measurement, it is confirmed that the first pipe 20 and the second pipe 30 are able to maintain a substantially inverted truncated conical shape, and the position where the body attachment parts 24 and 34 are removed is measured.
Calculating the size of the apex angle α from the values measured using the above method, and making a spindle gauge with the size of the apex angle α based on the result to measure the inner and outer diameters will make it more accurate. be.

Here, the apex angle α will be explained. The size of the apex angle α can be calculated from a fan-shaped blank in which the first pipe 20 and the second pipe 30 are developed. Moreover, the blanks 40 and 50 can be designed after determining the size of the apex angle α.
Alternatively, the outer diameter of the narrower end portions 22 and 32 of the first pipe 20 and the second pipe 30, the outer diameter of the larger diameter end portions 23 and 33, and the outer diameter of the first pipe 20 and the second pipe 30. From the length, the size of each apex angle α can be calculated.

Here, when the second pipe 30 is moved in the direction (including outward) of the end 22 on the small diameter side of the inverted truncated cone of the first pipe 20 (multistage straw 10), the first pipe 30 Since the inner diameter d2 of the end 22 on the small diameter side of the inverted truncated cone 20 is smaller than the outer diameter D3 of the end 33 on the large diameter side of the inverted truncated cone of the second pipe 30, the second pipe 30 It is not possible to pass through the narrow diameter end 22 of the inverted truncated cone of the pipe 20. Therefore, the vicinity of the large-diameter end 33 of the inverted truncated cone of the second pipe 30 and the vicinity of the narrow-diameter end 22 of the inverted truncated cone of the first pipe 20 stay in close contact with each other.

Here, the apex angle of the inverted truncated cone of the first pipe 20 is α1, and the apex angle of the inverted truncated cone of the second pipe 30 is α2. Let us consider the case where α1°>α2°, where the magnitude of the apex angle α1 is α1° and the magnitude of the apex angle α2 is α2°.

In the above case, the second pipe 30 is moved in the direction (including outward) of the end 22 on the small diameter side of the inverted truncated cone of the first pipe 20 (multistage straw 10), and the multistage straw 10 is extended, the inside of the small-diameter end 22 of the inverted truncated cone of the first pipe 20 and the outside of the body near the large-diameter end 33 of the inverted truncated cone of the second pipe 30 comes into contact. The contact is a circumferential line contact inside the narrow-diameter end 22 of the inverted truncated cone of the first pipe 20 . This line contact maintains the practical sealing performance of the overlapping portion 11 between the first pipe 20 and the second pipe 30.
Practical sealability here means a level of sealability that does not cause any problem when using a straw, although it is not strictly sealed. The sealing properties described hereinafter have the same meaning.

When the multi-stage straw 10 continues to expand further, the first pipe 20 and/or the second pipe 30 deforms and becomes wider in the ridgeline direction of the bodies of both pipes 20, 30, and the two pipes 20, 30 may be in surface contact in the circumferential direction, but if extended too much, the multi-stage straw 10 will be destroyed.

Further, consider a case where the magnitudes of the apex angle α1 and the apex angle α2 are α1°<α2°. FIG. 1 is a drawing in this case.
In the above case, the second pipe 30 is moved in the direction (including outward) of the end 22 on the small diameter side of the inverted truncated cone of the first pipe 20 (multistage straw 10), and the multistage straw 10 is extended, the outside of the large-diameter end 33 of the inverted truncated cone of the second pipe 30 and the inside of the body near the narrow-diameter end 32 of the inverted truncated cone of the first pipe 20 comes into contact. The contact is a circumferential line contact of the outer diameter of the large-diameter end 33 of the inverted truncated cone of the second pipe 30. This line contact maintains the practical sealing performance of the overlapping portion 11 between the first pipe 20 and the second pipe 30.

Further, the multi-stage straw 10 continues to be extended, and the first pipe 20 and/or the second pipe 30 are deformed, so that the body parts 21 and 31 of both pipes 20 and 30 have widths in the ridgeline direction and a surface in the circumferential direction. You can also make contact with it. However, if overstretched, the multi-stage straw 10 will break.

The difference between the apex angle α1 and the apex angle α2 is preferably 10° or less, more preferably 5° or less. By making it such a size, the multistage straw 10 is extended, the first pipe 20 and/or the second pipe 30 are deformed, and the straw is deformed in the direction of the ridgeline of the bodies 21 and 31 of both pipes 20 and 30. When having a width and making surface contact in the circumferential direction, even if the deformation of the first pipe 20 and/or the second pipe 30 is small, the contact area can be increased.

In the multistage straw 10 of this embodiment, the resistance force due to friction is reduced during the stretching operation, and the first pipe 20 and the second pipe 30 come into strong contact only at the final stage of stretching. Therefore, the multistage straw 10 is less likely to be damaged. Furthermore, the multi-stage straw 10 can be manufactured using a material with relatively low rigidity, resulting in cost reduction.

Further, a case where the apex angle α1 and the apex angle α2 are α1°=α2° will be explained in the next embodiment.

<Second embodiment of the present invention>
FIG. 3 shows a multistage straw 10 in which the apex angle α1 of the inverted truncated cone of the first pipe 20 and the apex angle α2 of the inverted truncated cone of the second pipe 30 are the same size, α1°=α2°.
Since the two pipes 20 and 30 have an inverted truncated cone shape with the same apex angle α, the angles of the ridge lines are the same, so when the multistage straw 10 is extended, the first pipe 20 and the second pipe 30 The overlapping portion 11 has a width in the ridgeline direction and comes into contact with the surface in the circumferential direction.

Moreover, even after the second pipe 30 and the first pipe 20 contact, if the second pipe 30 is further moved to the smaller diameter side of the inverted truncated cone of the second pipe 30, the outer surface of the second pipe 30 and the first pipe The surface pressure on the inner surface of 20 increases.
As described above, when the first pipe 20 and the second pipe 30 are extended, the effects of surface contact and increase in surface pressure overlap, and the frictional force on the contact surfaces becomes large. The first pipe 20 and the second pipe 30 are fixed.

The multistage straw 10 of this embodiment has little resistance due to friction during the stretching operation, and the first pipe 20 and the second pipe 30 come into strong contact only at the final stage of stretching. Therefore, the multistage straw 10 is less likely to be damaged. Furthermore, since the first pipe 20 and/or the second pipe 30 are not deformed and the overlapping portions 11 are in surface contact with each other, the sealing performance is good. Furthermore, the multi-stage straw 10 can be manufactured using a material with relatively low rigidity, resulting in cost reduction.

Note that when the apex angle α1 and the apex angle α2 are α1°=α2°, the sealing performance of the overlapping portion 11 of the multistage straw 10 is the best.
In addition, in practical terms, in the case of α1°<α2°, if the difference in size between the apex angle α1 and the apex angle α2 is 2° or less, they can be considered to be the same angle. Further, in the case of α1°>α2°, if the difference in size between the apex angle α1 and the apex angle α2 is 1° or less, they can be considered to be the same angle.

<Third embodiment of the present invention>
A third embodiment of the present invention will be described using FIG. 3.
In the multi-stage straw 10 of this embodiment, the length of the overlapping portion 11 between the first pipe 20 and the second pipe 30 is preferably 5 mm to 50 mm. If the above-mentioned overlapping length is less than 5 mm, there is a risk that the second pipe 30 will deviate to the narrow diameter side of the inverted cone of the first pipe 20, and if it exceeds 50 mm, there will be an excessive overlap, The cost is wasted.

More preferably, the overlapping length of the first pipe 20 and the second pipe 30 is 10 mm to 30 mm. A length within this range provides an excellent balance between frictional bonding force, sealing of the overlapping portion, and cost.

In the multistage straw 10 of the present embodiment, since the area of the overlapping portion 11 between the first pipe 20 and the second pipe 30 is appropriate, an appropriate frictional force is generated, and the area between the first pipe 20 and the second pipe 30 is Fixation is done properly. Further, the sealing performance of the overlapping portion 11 can be improved.

<Fourth embodiment of the present invention>
A fourth embodiment of the present invention will be described.
In the multistage straw 10 of this embodiment, a sheet of material is rolled into a cylindrical shape to form a pipe.

In general, a thin film-like material is sometimes called a film, and a thick film-like material is sometimes called a sheet. Here, the term "sheet" refers to the film used in this embodiment, regardless of its thickness. It refers to the material of the shape. Further, the sheet includes both a single layered product and a laminate.
Further, regardless of whether the sheet is a single layer or a laminate, the cross section and end face are drawn in a single layer to make the drawings easier to read.

A method of manufacturing the first pipe 20 of this embodiment shown in FIG. 4(a) will be described. The first pipe 20 is manufactured by winding the blank 40 of the first pipe 20 shown in FIG. 5(a) into a cylindrical shape and joining the body attachment margins 42 and 43.

In addition, in this embodiment, the front side of the blank of FIG. 5 becomes the inner surface of the multistage straw 10, and the back side becomes the outer surface of the multistage straw 10.

The material of the blank 40 of the first pipe 20 will be explained. The blank 40 of the first pipe 20 may be either a single layer or a laminate.

An embodiment in which the blank is a laminate made of paper as a base material will be described below.
As for paper, it is desirable that the basis weight is 50 g/m ² to 300 g/m ² . If the basis weight is less than 50 g/m ² , the rigidity of the laminate will be low, causing problems when using a straw. Specifically, there is a risk that the straw may be crushed when held in the mouth or crushed when grasped with the hand. If the basis weight exceeds 300 g/m ² , it becomes difficult to wind the material into a cylindrical shape (including an inverted truncated cone shape) with a narrow cross section like a straw.
More preferably, the basis weight is 100 g/m ² to 200 g/m ² . This basis weight provides a good balance between rigidity and ease of processing into a cylindrical shape.

A synthetic resin layer may be provided on the surface of the blank 40, here the inner surface of the first pipe 20. There are two main purposes for providing the synthetic resin layer. The first reason is to prevent the liquid to be sucked from penetrating into the laminate. Second, when the blank is rolled up to form a cylinder, the body attachment margins 42 and 43 are joined together, and a synthetic resin layer may be provided for this joining.

A synthetic resin layer may be provided on the back surface of the blank 40, here the outer surface of the first pipe 20. There are two main purposes for providing the synthetic resin layer. The first reason is to prevent saliva and the like from penetrating into the laminate when the drinker puts it in his or her mouth. Second, when the blank 40 is rolled up to form a cylindrical shape, the body adhesion margins 42 and 43 are joined together, and a synthetic resin layer may be provided for this joining.

Note that the above synthetic resin layer may be present on both the front and back surfaces, or on either one of the front and back surfaces. Further, for example, when sucking powder or the like, the synthetic resin layer may not be provided, and in this case, the body attachment portion may be joined with an adhesive. The installation of the synthetic resin layer is appropriately selected depending on the required performance of the multistage straw 10.

The synthetic resin layer may be made of low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, or the like. Moreover, if mechanical strength is required for the straw, polypropylene, polyethylene terephthalate, etc. may be used.

Furthermore, heat sealing is used to join the body bonding allowances 42 and 43 together. When heat-sealing, it is desirable that the bonding interface be made of the same material.
Heat-sealing methods include blowing hot air and then applying pressure, pressing a high-temperature heat-sealing bar against each other, ultrasonic welding, high-frequency welding, heating with infrared rays and then applying pressure, and other known methods. Appropriate selection is made based on the method.

Furthermore, the body adhering portion may be joined using a method other than heat sealing, such as an adhesive.

The laminate has a paper base material layer and a synthetic resin layer joined together, and the joining method involves extruding molten synthetic resin onto the surface of the paper base material layer to form a synthetic resin layer. It's okay.
Alternatively, the film and the paper base layer may be bonded by extruding a molten synthetic resin between the film and the paper base layer prepared in advance by an extrusion method. In this case, the molten resin becomes an adhesive layer.
Alternatively, films prepared in advance may be laminated using an adhesive.

When the multistage straw 10 is used for drinking, the paper base layer, synthetic resin layer, adhesive, etc. used above must be of excellent hygiene.
Although it is desirable that the synthetic resin layer be provided on both sides of the laminate, it may be provided on only one side depending on the required specifications.
For example, if a low-density polyethylene layer is provided only on the inner surface, the interface of the body sticking part will be a combination of the paper base layer and the low-density polyethylene layer, but if the heat sealing conditions are selected appropriately, joining is possible. .

Further, the thickness of the synthetic resin layer is preferably 10 μm to 150 μm. If the thickness is less than 10 μm, there is a risk that the heat-sealing will lack stability and the bonding strength of the heat-sealing will not increase. Moreover, if it exceeds 150 μm, the repulsion becomes large when the blank is rolled into a cylindrical shape, so there is a risk that more defects will occur, and the cost will be higher than necessary. Furthermore, a thickness of the synthetic resin layer of 20 μm to 60 μm provides an excellent balance between performance and cost.

The surface of the paper base layer can be appropriately printed. As a printing method, known gravure printing, offset printing, flexo printing, inkjet printing, screen printing, etc. can be used.
Since the color of the paper base layer is close to white, if there is no printing or printing in a light color, if the large diameter side of the first pipe 20 of the multistage straw 10 is colored with lipstick or the like, it will be noticeable. . Therefore, in order to make the coloring of the straw less noticeable, a dark-colored design may be printed near the larger diameter side of the first pipe 20.

In the above description, the sheet material is a laminate of paper base layers, but a sheet consisting only of a synthetic resin layer may also be used. The sheet may be a single layer or a laminate.

For example, a single layer polypropylene sheet may be used as the sheet material. The thickness of the polypropylene sheet is preferably 50 μm to 400 μm. More preferably, it is 100 μm to 300 μm. The above thickness provides an excellent balance between rigidity and cost.
Further, as a method for attaching the sheet to the body in a cylindrical shape, heat sealing, adhesive, etc. may be used.

As the material of the sheet, a laminate consisting only of synthetic resin layers may be used. For example, the innermost layer and the outermost layer may be thermoplastic resin layers (thermoadhesive resin layers), and a base material layer may be provided as the intermediate layer.

As an example, a three-layer sheet consisting of polyethylene (PE)/polyethylene terephthalate (PET)/polyethylene (PE) may be used. Alternatively, if rigidity of the sheet is required, a plurality of PET layers may be used as the base material layer. For example, it has a five-layer structure of polyethylene (PE)/polyethylene terephthalate (PET)/polyethylene (PE)/polyethylene terephthalate (PET)/polyethylene (PE).
Since both have polyethylene (PE) layers as the innermost and outermost layers, it is easy to heat seal the body.

The method of manufacturing the second pipe 30 is the same as the method of manufacturing the first pipe 20. Although the laminate of the second pipe 30 and the laminate of the first pipe 20 generally have the same specifications, they may be different laminates.
However, since the second pipe 30 has a smaller cylindrical diameter than the first pipe 20, it becomes difficult to wind it. Therefore, the stiffness of the laminate of the second pipe 30 may be smaller than the stiffness of the laminate of the first pipe 20.

Since the multistage straw 10 of this embodiment is manufactured using a sheet as a material, there are many choices of materials, and the material can be selected according to the required performance, cost, etc.

<Fifth embodiment of the present invention>
A multistage straw 10 according to a fifth embodiment of the present invention will be described in detail below using the drawings and the like.

It is preferable that the blanks of the body-attached portion of the first pipe 20 are wound (stacked) and the second pipe 30 is wound (stacked) in opposite directions.

FIG. 6(a) is a cross section of a multistage straw when the first pipe 20 and the second pipe 30 are wound in the same direction, and shows the AA cross section in FIG. 3.

An end surface 25A of the inner body sticking part 25 of the first pipe 20 and an end face 36A of the outer body sticking part 36 of the second pipe 30 are opposed to each other. When extending this multistage straw, if the first pipe 20 rotates clockwise relative to the second pipe 30, the end surface 25A of the body attachment part 25 inside the first pipe 20 and the second pipe There is a possibility that the end surface 36A of the outer body sticking part 36 of the outer part 30 comes into contact with the end face 36A. In that case, since a frictional force acts on the contact surfaces of the two end surfaces 25A and 36A, there is a possibility that the extension work of the multistage straw will be hindered.

FIG. 6(b) is a cross section of the multistage straw 10 of this embodiment when the first pipe 20 and the second pipe 30 are wound in opposite directions, and shows the AA cross section in FIG. .
An end surface 25A of the inner body sticking part 25 of the first pipe 20 and an end face 36A of the outer body sticking part 36 of the second pipe 30 face the same direction. Therefore, when extending the multistage straw 10 of this embodiment, if the first pipe 20 rotates clockwise or counterclockwise relative to the second pipe 30, the first pipe 20 rotates clockwise or counterclockwise relative to the second pipe 30. There is no possibility that the end surface 25A of the inner shell sticking part 25 of the pipe 20 and the end face 36A of the outer shell sticking part 36 of the second pipe 30 will come into contact with each other. Therefore, since strong contact does not occur between the two end surfaces 25A and 36A, the multistage straw 10 can be extended smoothly.

The multi-stage straw 10 of this embodiment operates smoothly when expanding and contracting, so it is easy for a drinker to handle, and the multi-stage straw 10 is less likely to be damaged when expanding and contracting.

<Sixth embodiment of the present invention>
A multi-stage straw 10 according to a sixth embodiment of the present invention will be described in detail below using the drawings and the like.

As shown in FIG. 7, a pointed end 37 may be provided at the end 32 on the narrow diameter side of the inverted truncated cone of the second pipe 30 of the multistage straw 10 of this embodiment. When drinking the contents of a container sealed with a lid made of a synthetic resin film or a laminate containing the same, the lid may be punctured by the multi-stage straw 10. At this time, in the multi-stage straw 10 of the present embodiment, since the second pipe 30 has a pointed end 37 at the end 32 on the small diameter side of the inverted truncated cone, the lid material can be pierced.

Furthermore, it is desirable to provide a pointed end 37 on the body attachment part 34 of the second pipe 30. The body attachment part 34 of the second pipe 30 has strength because it is made up of two laminates joined together, and is desirable for piercing work.

A method of manufacturing the multistage straw 10 shown in FIG. 7 will be described.
A blank of the multistage straw 10 of this example is shown in FIG. The shape of the blank 40 of the first pipe 20 is shown in FIG. 8(a), and the shape of the blank 50 of the second pipe 30 is shown in FIG. 8(b).

The blank 40 of the first pipe 20 shown in FIG. 8(a) is the same as that shown in FIG. 5(a), and has a fan-shaped shape. On the lower end surface 54 of the blank 50 of the second pipe 30 in FIG. When the blank 50 is processed into a cylindrical shape, they overlap.

Linear end surfaces are formed diagonally upward from the left and right vertices 56 toward the inner and upper side of the blank 50 of the second pipe 30, and the left and right end surfaces are approximately at the center of the blank 50 in the width direction. connected on a line. The connected point is the most concave point 57 of the concave portion of the end surface 54 of the blank 50 of the second pipe 30.

In addition, straight ends are formed diagonally upward from the left and right vertices 56 to the outer and upper side of the blank 50 of the second pipe 30, and are connected to the side edges of the blank 50 of the second pipe 30. ing.

The first pipe 20 is manufactured by winding the blank 40 of the first pipe 20 shown in FIG. 8(a) into a cylindrical shape, and joining the body pasting margins 42 and 43.
The second pipe 30 is manufactured by winding the blank 50 of the second pipe 30 shown in FIG. 8(b) into a cylindrical shape, and joining the body bonding margins 52 and 53.

In addition, in this embodiment, the front side of the blank of FIG. 8 becomes the inner surface of the multistage straw 10, and the back side becomes the outer surface of the multistage straw 10.

The multi-stage straw 10 of this embodiment has the pointed end 37 on the narrower diameter side of the inverted truncated cone of the second pipe 30, so it is suitable for drinking by penetrating the lid.

In this embodiment, the apex 56 is provided on the lower end surface 54 of the blank 50, but after the multi-stage straw 10 of the second embodiment is completed, the end 32 of the second pipe 30 on the small diameter side may be cut to form the pointed end 37.

<Seventh embodiment of the present invention>
A multistage straw 10 according to a seventh embodiment of the present invention will be described in detail below using the drawings and the like.

FIG. 9 shows a multistage straw 10 of this embodiment. FIG. 9(a) is a diagram of the first pipe 20, which has a cylindrical shape in the shape of an inverted truncated cone without a body attachment part. FIG. 9(b) is a single drawing of the second pipe 30, which has a cylindrical shape in the shape of an inverted truncated cone without a body attachment part. FIG. 9(c) is a diagram of the multistage straw 10 of this embodiment before expansion.
The wall thickness of the pipes 20, 30 is substantially uniform in a cut plane perpendicular to the central axis in the longitudinal direction of the pipes 20, 30, and there are no places with uneven pressure such as the body bonding parts 24, 34. Therefore, no stepped portion is visible from the outside.

A method for manufacturing the pipes 20, 30 as described above includes, for example, a synthetic resin injection molding method, and the pipes 20, 30 in the shape of an inverted truncated cone can be formed. Moreover, after forming a cylindrical pipe by extrusion molding, it may be deformed by pressing or the like to produce the pipes 20, 30 having an inverted truncated cone shape.

The multi-stage straw 10 of this embodiment has a simple appearance because the pipes 20 and 30 have no steps in the circumferential direction. In addition, unlike the multi-stage straw 10 having the pipes 20, 30 with the body-attached portions 24, 34, the end surfaces 25A, 36A do not come into contact with each other, so that the operation is less likely to be hindered during expansion and contraction.

<Eighth embodiment of the present invention>
A multistage straw 10 according to an eighth embodiment of the present invention will be described in detail below using the drawings and the like.

In the multistage straw 10 of this embodiment, the first pipe 20 and the second pipe 30 are fixed in the extended position, and the second pipe 30 is connected to the inverted truncated cone of the first pipe 20 (multistage straw 10). It is prevented from returning in the direction of the larger diameter end portion 23 (including further outward). A protrusion 28 may be provided inside the first pipe 20 to abut the end 33 on the larger diameter side of the inverted truncated cone of the second pipe 30 .

The protrusion 28 inside the first pipe 20 may be provided as a separate member from the first pipe 20, as shown in FIG. The separate member may be a solid material made of synthetic resin that is prepared in advance and attached to the inner wall of the first pipe 20. Alternatively, hot melt or the like may be applied to the inside of the first pipe 20 and then solidified.

Further, the inner protrusion 28 of the first pipe 20 may be formed when the first pipe 20 is blank, or may be formed after the first pipe 20 is shaped into a cylinder.

At least one protrusion 28 on the inside of the first pipe 20 may be present in a dot shape, or may be in a circumferential shape. In the case of a circumferential shape, it may be one circumference or a partial circumference in the circumferential direction.

Alternatively, the member of the first pipe 20 may be bent so that the bent portion protrudes inward (not shown).
At least one bent portion may exist in the form of a dot, or may be in the form of a circumference. In the case of a circumferential shape, it may be one circumference or a partial circumference in the circumferential direction. Further, the bent portion may be formed when the first pipe 20 is blank, or may be formed after the first pipe 20 has a cylindrical shape.

In the multi-stage straw 10 of this embodiment, since the multi-stage straw 10 is fixed in the extended position, it does not contract during drinking and can be used stably.

<Ninth embodiment of the present invention>
A multistage straw 10 according to a ninth embodiment of the present invention will be described in detail below using the drawings and the like.

The first pipe 20 and the second pipe 30 of the multistage straw 10 of this embodiment are fixed in the extended position, and the second pipe 30 The protrusion 38 that abuts the narrow diameter end 22 of the inverted conical truncated cone of the first pipe 20 is moved from the second pipe 30 so that it does not return in the direction of the diameter end 23 (including outward). It may be provided outside.

The protrusion 38 on the outside of the second pipe 30 may be provided as a separate member from the second pipe 30, as shown in FIG. The separate member may be a solid material made of synthetic resin that is prepared in advance and attached to the outer wall of the second pipe 30. Alternatively, hot melt or the like may be applied to the outer wall of the second pipe 30 and then solidified.

Further, the outer protrusion 38 of the second pipe 30 may be formed when the second pipe 30 is blank, or may be formed after the second pipe 30 is shaped into a cylinder.

At least one protrusion 38 on the outside of the second pipe 30 may be present in a dot shape, or may be in a circumferential shape. In the case of a circumferential shape, it may be one circumference or a partial circumference in the circumferential direction.

Alternatively, the member of the second pipe 30 may be bent to have a bent portion protrude outward (not shown).
At least one bent portion may exist in the form of a dot, or may be in the form of a circumference. In the case of a circumferential shape, it may be one circumference or a partial circumference in the circumferential direction. Further, the bent portion may be formed when the second pipe 30 is blank, or may be formed after the second pipe 30 has a cylindrical shape.

In the multi-stage straw 10 of this embodiment, since the multi-stage straw 10 is fixed in the extended position, it does not contract during drinking and can be used stably.

<Tenth embodiment of the present invention>
A multistage straw 10 according to a tenth embodiment of the present invention will be described in detail below using the drawings and the like.

As shown in FIG. 12, a drop-off prevention means may be provided on the larger diameter side of the inverted truncated cone of the first pipe 20 in order to prevent the second pipe 30 from falling off.
The falling-off prevention means may be such that the large-diameter end 23 of the inverted truncated cone of the first pipe 20 is bent inward over the entire circumference to form a bent portion 29, as shown in FIG. A portion of the entire circumference of the end portion 23 may be bent (not shown).
Note that the end surface of the bent portion 29 does not necessarily have to be directed to the narrow diameter side of the inverted truncated cone of the first pipe 20 (bent beyond a substantially right angle), and may be bent to an extent that the second pipe 30 does not fall off. .

Here, a method has been described in which the bent portion 29 is formed on the inner surface of the large-diameter end 23 of the inverted truncated cone of the first pipe 20 over the entire circumference. A protrusion 27 for preventing slippage may be provided near the radial end 23 as shown in FIG.
The protrusion 27 for preventing coming off may be provided as a separate member from the first pipe 20. The separate member may be provided on the outside of the first pipe 20 by preparing a solid material made of synthetic resin in advance. Alternatively, hot melt or the like may be applied to the inside of the first pipe 20 and then solidified.

The above drop-off prevention means is processed after the second pipe 30 is inserted into the hollow portion of the first pipe 20. However, if the drop-off prevention means is flexible enough to allow insertion of the second pipe 30, the second pipe 30 may be inserted after processing the drop-off prevention means first. In that case, when the second pipe 30 is inserted, the opening of the falling-off prevention means expands and the second pipe 30 can pass through, but after the second pipe 30 passes, the opening returns to its original size and shrinks. Therefore, it has a function of preventing the second pipe 30 from falling off.
Alternatively, the second pipe 30 can be deformed (shrinked) and passed through, but after the second pipe 30 has passed, the second pipe 30 is restored and expanded, so that it has a function of preventing the second pipe 30 from falling off.

In the multi-stage straw 10 of this embodiment, when the multi-stage straw 10 is carried in the contracted position, it is possible to prevent the second pipe 30 from falling out of the hollow part of the first pipe 20. It is possible to prevent the straw 10 from being damaged.

Next, specific examples of the present invention will be described.

<Example 1>
The laminates constituting the first pipe 20 and the second pipe 30 of the multistage straw 10 of Example 1 both had the same layer structure, using a paper base layer as a base material, and had the layer structure shown below.
(Outside) PE15μm / (Printing) Cup base paper / PE20μm (Inside)
For the outer and inner PE, low density polyethylene LC520 manufactured by Nippon Polyethylene was used. As the cup base paper, Ojiebetsu cup base paper 140 g/m ² manufactured by Oji Special Paper was used.

First, a roll of cup base paper was prepared, a pattern was printed on the outside of the cup base paper using a gravure printing machine, the paper was wound again into a roll, and the paper was stored in a roll.

Next, the printed cup base paper was set in a tandem extrusion processing machine having two extrusion mechanisms arranged in series.
The cup base paper was fed out, and first, the printed surface of the cup base paper was subjected to corona treatment. Thereafter, the corona-treated surface (the outer surface of the cup base paper) was extruded and coated with low-density polyethylene to a thickness of 15 μm.

In the next step, corona treatment was applied to the opposite side of the cup paper from which it was printed. Then, the corona-treated surface (inner surface of the cup base paper) was extruded and coated with low-density polyethylene to a thickness of 20 μm. Then, the above laminate was rolled up into a roll to produce a roll of the laminate of the first pipe 20 and the second pipe 30.

In the next step, blanks 40 and 50 for the first pipe 20 and the second pipe 30 were punched out using a Dorsler punching machine. The drawn blanks were stacked in the same direction and then stored and transported.

The shape of the blank 40 of the first pipe 20 is shown in FIG. 5(a), and the shape of the blank 50 of the second pipe 30 is shown in FIG. 5(b).
Both have a fan-shaped shape. The surface in FIG. 5 is the surface of the blank, and is the surface that will be inside when the pipes 20 and 30 are formed. Further, the back surface in FIG. 5 is the back surface of the blank, and is the surface that becomes the outside when the pipes 20 and 30 are formed.
Further, based on the drawing of FIG. 5, the top, bottom, left and right of the blank are defined.
From now on, in the description of the blanks shown in the drawings, the positional relationships will be as described above.

Body attachment allowances 42 and 43 when forming the blank 40 of the first pipe 20 into a cylindrical shape exist on the left and right sides of the blank 40 of the first pipe 20. Either of the left or right body pasting allowances 42 and 43 may be the outer surface of the straw, but it should be selected as appropriate depending on the specifications of the body pasting section processing machine, the combination processing machine for combining the first pipe 20 and the second pipe 30, etc. be done.

In the next step, the blank 40 was pasted. The blank 40 of the first pipe 20 was sent to a body pasting machine and was pasted into a cylindrical shape.
First, in the blank 40 of the first pipe 20, when it was wound into a cylindrical shape, the surface of the body-spreading margin 42, which was the inner side, and the back surface of the body-splicing margin 43, which was the outer side, were heated with hot air. The roasting temperature was such that the laminated low-density polyethylene melted sufficiently.

Next, the blank 40 of the first pipe 20 was wound around a mandrel having an inverted truncated cone shape. At that time, the surface of the body attachment margin 42 that becomes the inner side when wound into a cylindrical shape and the back surface of the body attachment margin 43 that becomes the outer side were wound so as to face each other. The apex angle of the inverted truncated cone shape of the mandrel and the apex angle of the side surface shape of the inverted truncated cone of the first pipe 20 were made to be the same. Therefore, both end surfaces 25A and 26A of the body attachment portion 24 of the first pipe 20 are parallel to each other.
When a cooling bar was pressed against the outside of the overlapping body bonding portions 24, the melted low-density polyethylene resin of the body bonding portions 24 of the first pipe 20 was solidified and joined.

Next, the first pipe 20 was removed from the mandrel, and the first pipe 20 having a side surface shape of an inverted truncated cone was completed. By inserting the narrow diameter end 22 of the inverted truncated cone of the other first pipe 20 into the opening of the large diameter end 23 of the inverted truncated cone of the first pipe 20, the overlap occurs. and stored.

The second pipe 30 was manufactured using the following procedure.
First, in the blank 50 of the second pipe 30, when it was wound into a cylindrical shape, the surface of the inner side of the body attachment 52 and the back side of the outer side of the body attachment 53 were heated with hot air. The roasting temperature was such that the laminated low-density polyethylene melted sufficiently.

Next, the blank 50 of the second pipe 30 was wound around a mandrel having an inverted truncated cone shape. At that time, the winding was carried out so that the surface of the body-spreading allowance 52, which would be the inner side when it was wound into a cylinder, and the back surface of the body-spinning allowance 53, which would be the outside, faced each other. The apex angle of the inverted truncated cone shape of the mandrel and the apex angle of the side surface of the inverted truncated cone shape of the second pipe 30 were made to be the same. Therefore, both end surfaces 35A and 36A of the body attachment part 34 of the second pipe 30 were parallel.

When a cooling bar was pressed against the outside of the body attachment part 34 of the second pipes 30 that were overlapped, the melted low density polyethylene resin of the body attachment part 34 of the second pipe 30 solidified and were joined.
Further, since the apex angle of the inverted truncated cone shape of the mandrel of the first pipe 20 and the apex angle of the mandrel of the second pipe 30 are the same, the inverted truncated cone shape of the first pipe 20 manufactured using these mandrels is the same. The apex angle α1 of the second pipe 30 and the apex angle α2 of the inverted truncated cone of the second pipe 30 were the same.

Next, the second pipe 30 was removed from the mandrel, and the second pipe 30 having the side surface shape of an inverted truncated cone was completed. The small diameter end 32 of the inverted truncated cone of the other second pipe 30 is inserted into the opening of the large diameter end 33 of the inverted truncated cone of the second pipe 30, so that they are overlapped. It was stored as

The first pipe 20 has a length of 100 mm, an outer diameter of the large diameter end 23 of the inverted truncated cone of φ11.5 mm, an outer diameter of the narrow diameter side of the inverted truncated cone of φ8.0 mm, and an apex angle. The side surface was an inverted truncated cone with an angle of 2°.
The size of the second pipe 30 is 100 mm in length, the outer diameter of the large diameter end 33 of the inverted truncated cone is φ8.4 mm, the outer diameter of the small diameter side of the inverted truncated cone is φ4.9 mm, and the apex angle The side surface was an inverted truncated cone with an angle of 2°.

After inserting the second pipe 30 into the large-diameter end 23 of the inverted truncated cone of the first pipe 20 from the narrow-diameter end 32 of the inverted truncated cone, the second pipe 30 is further inserted into the multistage straw. 10 to the smaller diameter side. Then, the inner surface of the first pipe 20 near the small-diameter end 22 of the inverted truncated cone and the outer surface of the second pipe 30 near the large-diameter end 33 of the inverted truncated cone came into planar contact. This is because the apex angle of the first pipe 20 and the apex angle of the second pipe 30 are equal. Since the two pipes were in planar contact, the frictional force was large and the two pipes were fixed together.
Note that the overlap margin between the first pipe 20 and the second pipe 30 was 22 mm.

<Example 2>
The laminates constituting the first pipe 20 and the second pipe 30 of the multistage straw 10 of Example 2 both had the same layer structure, using a paper base layer as a base material, and had the layer structure shown below.
(Outside) Paper (Daio Paper Co., Ltd. coated paper 80g/m2) /
Polyethylene 15μm (Japan Polyethylene Co., Ltd. LC520 /
Aluminum foil 6μm (JIS H4000 2014 A8079P) /
Anchor coat (Mitsui Chemicals, Inc. A-3210/A-3075) /
EMAA30μm (Mitsui DuPont Polychemical Co., Ltd. N0908N) /
Polyethylene 10 μm (Asahi Kasei Corporation Suntech LDPE + Mitsui Chemicals Corporation Tafmar) (inside).
This laminate was produced by extruding each polyethylene. Further, the anchor coat was coated inside the extrusion processing machine.

Note that the shell pasting process was such that the blanks 40, 50 formed into a predetermined shape were wound around a mandrel, and a heated heat seal bar was pressed against the outside of the blanks 40, 50. In this process, the blanks 40 and 50 were subjected to body bonding processing.

A multistage straw 10 was manufactured using the same processing method and shape as in Example 1 in other respects.

<Example 3>
The sheets constituting the first pipe 20 and the second pipe 30 of the multistage straw 10 of Example 3 were both single-layer polypropylene sheets, and their thickness was 200 μm.

In addition, the method of body bonding is that the blanks 40 and 50 formed into a predetermined shape are wound around an inverted truncated cone-shaped mandrel, and a bar-shaped ultrasonic horn is pressed from the outside to perform ultrasonic welding. This method was adopted. In this process, the blanks 40 and 50 were subjected to body bonding processing. The ultrasonic welding machine was manufactured by Emerson Japan Co., Ltd., model 2000Xea20:2.5, and output 2500W.

A multistage straw 10 was manufactured using the same processing method and shape as in Example 1 in other respects.

<Example 4>
The sheets constituting the first pipe 20 and the second pipe 30 of the multistage straw 10 of Example 4 were single-layer Western paper. The Western paper used was Nippon Paper Trading Co., Ltd., copy paper 66 g/m ² . The thickness was 100 μm.

The method for attaching the body was as follows. An emulsion-based adhesive was applied to the inner surfaces of the outer body bonding parts 26 and 36, which are the outer sides when the blanks 40 and 50 formed into a predetermined shape are formed into an inverted truncated conical pipe shape. In the next step, the blanks 40, 50 are wound around a mandrel having an inverted truncated cone shape, and the outer surfaces of the inner shell bonding portions 25, 35 are brought into contact with the inner surfaces of the outer shell bonding portions 26, 36. Then, a bar-shaped trowel was pressed against the outside of the body attachment parts 24, 34 of the pipes 20, 30 to bond them together.
In the above steps, the blanks 40 and 50 were subjected to body bonding processing.

A multistage straw 10 was manufactured using the same processing method and shape as in Example 1 in other respects.

<Example 5>
In Example 5, the protrusion 28 inside the first pipe 20 is provided at a position where the second pipe 30 is fixed when the multistage straw 10 is extended and completed.

In this embodiment, the protrusions 28 on the inside of the first pipe 20 are made of hot melt, and each blank 40 has two protrusions.
After the molten hot melt was applied in the appropriate amount to the appropriate location on the blank 40, the hot melt was cooled in the atmosphere and solidified. Note that the same blank 40 as in Example 1 was used.

Next, the blank 40 of the first pipe 20 provided with the protrusion 28 was sent to a body pasting machine and was body pasted into a cylindrical shape.
In the blank 40 of the first pipe 20, when the blank 40 was wound into a cylindrical shape, both the surface of the inner body-spreading margin 42 and the back surface of the outer shell-splicing margin 43 were roasted with hot air. The roasting temperature was such that the laminated low-density polyethylene melted sufficiently.

Further, on the side surface of the mandrel, a recess was provided in a region corresponding to the protrusion 28 provided on the blank 40 of the first pipe 20 so as not to interfere with the protrusion 28 . By doing so, the protrusion 28 and the side surface of the mandrel do not interfere with each other, so that the blank 40 of the first pipe 20 can be brought into close contact with the mandrel, and its shape is stabilized.

In addition, a method of processing the blank 50 of the second pipe 30 into a cylindrical pipe, and a method of manufacturing the multistage straw 10 of this embodiment by inserting the second pipe 30 into the hollow part of the first pipe 20 are as follows: Same as Example 1.

In addition, in the multistage straw 10 of this embodiment, at the position where the two pipes 20 and 30 are fixed, the end surface of the large diameter side end 33 of the inverted truncated cone of the second pipe 30 is the same as that of the first pipe 20. The two pipes 20, 30 were fixed to abut the inner protrusion 28 as shown in FIG. The number of protrusions 28 was two, and the size was approximately hemispherical with a diameter of 1.5 mm, but since they were made from molten hot melt, they were irregular in shape.

<Example 6>
In the sixth embodiment, as shown in FIG. 11, a protrusion 38 on the outside of the second pipe 30 is provided, and when the multistage straw 10 is extended, the end 22 on the small diameter side of the inverted truncated cone of the first pipe 20 and the protrusion 38 abutted against each other, and the first pipe 20 and the second pipe 30 were fixed. The protrusion 38 was provided by applying hot melt after the second pipe 30 was completed, and then solidifying it to provide the protrusion 38.

A multistage straw was manufactured using the same materials, processing method, and shape as in Example 1.

<Example 7>
In the multi-stage straw 10 of Example 7, the second pipe 30 was prevented from falling out of the hollow part of the first pipe 20 before the multi-stage straw 10 was extended.

In the multi-stage straw 10 of Example 7, when the length of the multi-stage straw 10 when extended and the length of the second pipe 30 are the same as in Example 1, the first pipe of the multi-stage straw 10 of Example 7 The blank 40 of the pipe 20 needed to be longer in the vertical direction than the blank 40 of the first pipe 20 of the first embodiment. The elongated side was the side of the end face 45 on the larger diameter side of the inverted truncated cone of the blank 40 of the first pipe 20.

In Example 7, a laminate prepared in the same manner as in Example 1 was punched out using a Dorsler into the shape of the blank 40 of the first pipe 20, which was larger than that in Example 1. The blank 50 of the second pipe 30 was the same as in Example 1.

In this example, the first pipe 20 and the second pipe 30 were manufactured using the same method as in Example 1. After inserting the second pipe 30 into the hollow portion of the first pipe 20, the end 23 of the inverted truncated cone on the larger diameter side of the first pipe 20 was bent inward into a circumferential shape as shown in FIG. By doing this, the inner diameter of the end 23 on the larger diameter side of the inverted truncated cone of the first pipe 20 becomes smaller, so that the second pipe 30 does not fall off.

A multistage straw was manufactured using the same materials, processing method, and shape as in Example 1.

In the seventh embodiment described above, the end 23 on the large diameter side of the inverted truncated cone of the first pipe 20 is folded back circumferentially inward, but the end 23 is provided with one or more folded pieces, and You can turn it around.

Further, as shown in FIG. 13, by providing two protrusions 27 near the large-diameter end 23 of the inverted truncated cone of the first pipe 20, the inner diameter of the part (the protrusion 27 and the first pipe 20) becomes smaller, and the second pipe 30 can be prevented from falling off. Note that the protrusion 27 may be formed by applying hot melt.

<Example 8>
In the multi-stage straw 10 of Example 8, the first pipe 20 and the second pipe 30 were wound in different directions (ends located outside the body attachment part).

FIG. 6 shows an AA cross section of the overlapping portion 11 of the first pipe 20 and second pipe 30 in FIG.
In FIG. 6A illustrating the prior art, in the first pipe 20, the right-hand body pasting allowance 43 of the blank 40 of the first pipe 20 becomes the outside body pasting part 26 of the first pipe, and the left-hand body pasting allowance Reference numeral 42 designates the body attachment portion 25 inside the first pipe. In addition, in the second pipe 30 as well, the right side body attachment portion 53 of the blank 50 of the second pipe 30 becomes the outer body attachment portion 36 of the second pipe 30, and the left side body attachment portion 52 becomes the inner body attachment portion 36 of the second pipe 30. This becomes the body attachment part 35. Therefore, the winding directions of the first pipe 20 and the second pipe 30 are the same.

On the other hand, in FIG. 6(b) showing this embodiment, in the first pipe 20, the right side body pasting allowance 43 of the blank 40 of the first pipe 20 is attached to the body pasting portion 26 on the outside of the first pipe 20. As a result, the left side trunk attachment portion 42 becomes the interior trunk attachment portion 25 of the first pipe 20.
In addition, in the second pipe 30 , the right side body attachment portion 53 of the blank 50 of the second pipe 30 becomes the body attachment portion 35 on the inside of the second pipe 30 , and the left side body attachment portion 52 becomes the body attachment portion 35 on the outside of the second pipe 30 . It has become the body attachment part 36. Therefore, the winding directions of the first pipe 20 and the second pipe 30 were opposite.

A multistage straw was manufactured using the same materials, processing method, and shape as in Example 1.

<Example 9>
Example 9 will be explained. The steps up to the manufacture of the laminate, which is the material for the pipe, were the same as in Example 1, except for the blank punching step.

The blank of this example is shown in FIG. The shape of the blank 40 of the first pipe 20 is shown in FIG. 8(a), and the shape of the blank 50 of the second pipe 30 is shown in FIG. 8(b).

The method of processing the two blanks 40 and 50 into a cylindrical pipe and the method of manufacturing the multistage straw 10 of this embodiment by inserting the second pipe 30 into the hollow part of the first pipe 20 are as follows. It was the same as 1.

A multistage straw 10 was manufactured using the same materials, processing method, and shape as in Example 1.

In the multi-stage straw 10 of this embodiment, as shown in FIG. 7, the end 32 on the small diameter side of the inverted truncated cone of the second pipe 30 is a pointed end at the body attachment part 34 of the second pipe 30 where the laminated bodies overlap. It had a shape cut diagonally upward from part 37. In addition, the tip portion 37 was made of two laminates joined together and had strength. Therefore, the multi-stage straw 10 of this embodiment could be used for drinking by piercing a lid material that is easily perforated.

<Comparative example 1>
The sheets (films) constituting the first pipe 20 and the second pipe 30 of the multistage straw 10 of Comparative Example 1 were both the same single-layer polyethylene terephthalate sheets (films), and their thickness was 15 μm.

An attempt was made to produce a multi-stage straw using the same processing method and shape as in Example 1, but it was impossible to produce it.

<Comparative example 2>
The sheets (films) constituting the first pipe 20 and the second pipe 30 of the multistage straw 10 of Comparative Example 2 were both single-layer sheets (films) of stretched nylon, and the thickness thereof was 15 μm.

An attempt was made to produce a multi-stage straw using the same processing method and shape as in Example 1, but it was impossible to produce it.

<Comparative example 3>
The laminates constituting the first pipe 20 and the second pipe 30 of the multistage straw 10 of Comparative Example 3 both had the same layer structure, using a paper base layer as a base material, and had the layer structure shown below.
(Outside) PE20μm / (Ink) Cup base paper / PE40μm (Inside).
For the outer and inner PE, low density polyethylene LC520 manufactured by Nippon Polyethylene was used. As the cup base paper, acid-resistant cup base paper 320 g/m ² manufactured by Oji F-Tex was used.

An attempt was made to produce a multi-stage straw using the same processing method and shape as in Example 1, but it was impossible to produce it.

<Comparative example 4>
In the multistage straw of Comparative Example 4, both the first pipe and the second pipe are cylindrical pipes without a taper.
In Comparative Example 4, the steps up to the production of the laminate that is the material for the pipe are the same as in Example 1, but the steps starting from the blank punching step are different.

Both the first pipe blank and the second pipe blank of Comparative Example 4 had a rectangular shape.
The process of processing the punched blank into a cylindrical shape and the process of combining it into a multistage straw were the same as in Example 1.
The first pipe has a cylindrical shape with a length of 100 mm and an outer diameter of 11.5 mm, and the second pipe has a cylindrical shape with a length of 100 mm and an outer diameter of 11.0 mm. there were.

<Comparative example 5>
The multistage straw of Comparative Example 5 was a commercially available multistage straw in which the second pipe was inserted into the hollow part of the cylindrical first pipe. The material was polypropylene.

<Evaluation>
Table 1 summarizes the stiffness of the sheets of Examples 1 to 9 and Comparative Examples 1 to 5, the strength when the pipe is crushed, the total thickness, and whether or not a tapered multi-stage straw can be formed.
The stiffness was measured based on JIS P8125 using a Garless stiffness tester (Model 211502201 manufactured by Toyo Seiki Seisakusho).

To determine the crushing strength of the pipe, a pipe with an external diameter of φ10 was prepared and a crushing test was performed using Tensilon (model RTM series U-1160, manufactured by Orientec Co., Ltd.). If the pipe was tapered, the part with an outer diameter of φ10 was crushed. The crushing speed was 50 mm/min.
In addition, in the case of the sample having a body sticking part, the width of the body sticking part was about 3 mm, and the sample was crushed by installing the body sticking part so that it would not be bent when crushed.

The total thickness was measured with a micrometer (model MDC-25L) manufactured by Mitutoyo Co., Ltd.
The feasibility of forming a tapered multi-stage straw is determined by the results of trial production using each sheet.

When the multistage straws 10 of Examples 1, 3, and 4 are extended, the small diameter side of the inverted truncated cone of the first pipe 20 and the large diameter side of the inverted truncated cone of the second pipe 30 are in contact for about 20 mm. , the inner surface of the first pipe 20 and the outer surface of the second pipe 30 were able to maintain a fixed state due to friction. When I drank apple juice from a cup, I was able to use it without any problems.

When the multistage straw 10 of the second embodiment is extended, the small diameter side of the inverted truncated cone of the first pipe 20 and the large diameter side of the inverted truncated cone of the second pipe 30 come into contact over about 20 mm, and the first The inner surface of the pipe 20 and the inner surface of the second pipe 30 were able to maintain a fixed state due to friction. The operator blows exhaled air from the large diameter end 23 of the inverted truncated cone of the first pipe 20 of the multistage straw 10, and blows out the exhaled air from the narrow diameter end 32 of the inverted truncated cone of the second pipe 30. , it was possible to blow away the dust that was in the narrow area of the machine.

When the multistage straw 10 of the fifth embodiment is extended, the protrusion 28 provided inside the first pipe 20 contacts the large diameter end 33 of the inverted truncated cone of the second pipe 30. The first pipe 20 and the second pipe 30 are fixed more firmly. Therefore, even when the multistage straw 10 was compressed in the vertical direction, it did not shrink.
Note that when the second pipe 30 passed over the protrusion 28 of the first pipe 20, the second pipe 30 was bent, so that the second pipe 30 could pass.

When the multi-stage straw 10 of the sixth embodiment is extended, the protrusion 38 provided on the outside of the second pipe 30 and the end 22 of the inverted truncated cone on the narrow diameter side of the first pipe 20 come into contact with each other. The first pipe 20 and the second pipe 30 are fixed more firmly. Therefore, even when the multistage straw 10 was compressed in the vertical direction, it did not shrink.
Note that when the first pipe 20 passed over the protrusion 38 of the second pipe 30, the second pipe 30 was bent, so that the first pipe 20 could pass.

In the multi-stage straw 10 of the seventh embodiment, even if the multi-stage straw 10 in a state before being expanded is shaken, the second pipe 30 does not deviate from the large-diameter end 23 of the inverted truncated cone of the first pipe 20. There were no problems and it was stored in good condition.
When the multistage straw 10 of Example 7 is extended, the small diameter side of the inverted truncated cone of the first pipe 20 and the large diameter side of the inverted truncated cone of the second pipe 30 come into contact over about 20 mm, and the first pipe The inner surface of the second pipe 30 and the outer surface of the second pipe 30 were able to maintain a fixed state due to friction.

In the multistage straw 10 of Example 8, even when the second pipe 30 moves relative to the first pipe 20 while rotating around the vertical direction when extending the multistage straw 10, the force of the extension operation is did not increase in size. Regardless of whether the direction of rotation of the second pipe 30 was clockwise or counterclockwise, the force of the stretching operation did not increase.
When the multistage straw 10 of Example 8 is extended, the small diameter side of the inverted truncated cone of the first pipe 20 and the large diameter side of the inverted truncated cone of the second pipe 30 come into contact over about 20 mm, and the first pipe The inner surface of the second pipe 30 and the outer surface of the second pipe 30 were able to maintain a fixed state due to friction.

When the multistage straw 10 of Example 9 is extended, the small diameter side of the inverted truncated cone of the first pipe 20 and the large diameter side of the inverted truncated cone of the second pipe 30 come into contact over about 20 mm, and the first pipe The inner surface of the second pipe 30 and the outer surface of the second pipe 30 were able to maintain a fixed state due to friction.
In addition, in the multi-stage straw 10 of Example 9, when drinking a cup beverage containing coffee that is sealed with a lid material that is easily perforated, the multi-stage straw 10 can be penetrated by piercing the lid material. I was able to use it without any problems.

An attempt was made to produce a multistage straw using the films of Comparative Examples 1 and 2, but the films were too soft and it was difficult to form them into a pipe shape.

An attempt was made to produce a multistage straw using the sheet of Comparative Example 3, but the film was too hard and it was difficult to form it into a pipe shape.

The multi-stage straw of Comparative Example 4 uses the same laminated body as Example 1, but due to the combination of cylindrical pipes, excessive force is required during the stretching operation, and the first (large diameter) pipe I crushed the second (small diameter) pipe with my finger. Furthermore, when the multistage straw was extended with a large force, the second (thin diameter) pipe slipped out from the end face on the small diameter side of the inverted truncated cone of the first (thick diameter) pipe.

The multi-stage straw of Comparative Example 5 was a cylindrical multi-stage straw manufactured by extrusion molding of commercially available polypropylene. This multistage extension work was carried out without any problems, and the pipe did not collapse. Therefore, a multi-stage straw having crushing strength comparable to this multi-stage straw does not need to be of a tapered type.

From Table 1, the stiffness of the sheet that is highly effective for the tapered multi-stage straw of the present invention is 0.5 to 4 mN.
Further, the crushing strength at which the tapered multi-stage straw of the present invention is highly effective is 10 to 20 mN. Note that the method for measuring this crushing strength is as described above.

In addition, although the above-mentioned Examples 1 to 8 have been described with respect to a two-stage straw, a multi-stage straw with three or more stages is also possible.

10 Multi-stage straw of the present invention 11 Overlapping part of the first pipe and second pipe 20 First pipe 21 Body part 22 of the first pipe End part on the narrow diameter side of the inverted truncated cone of the first pipe 23 Inverse of the first pipe End portion 24 on the larger diameter side of the truncated cone 25 Trunk attachment portion 25 of the first pipe Inside body attachment portion 25A of the first pipe End face 26 of the inner body attachment portion of the first pipe 26A of the outer body attachment portion of the first pipe End face 27 of the outer body sticking part of the first pipe 27 Projection part 28 to prevent the first pipe from coming off Projection part 29 on the inner surface of the first pipe 30 Bend part 30 of the first pipe 30 Second pipe 31 Body part 32 of the second pipe End 33 on the narrow diameter side of the inverted truncated cone of the second pipe 34 End 34 on the large diameter side of the inverted truncated cone of the second pipe 34 Trunk attachment part 35 of the second pipe diameter 35A Inside trunk attachment part of the second pipe diameter End face 36 of the inner body paste part of the second pipe diameter 36A End face of the outer body paste part of the second pipe diameter 38 Protrusion part 40 of the outer surface of the second pipe Blank of the first pipe 41 Body part of the first pipe blank 42 Body attachment allowance on the left side of the first pipe blank 43 Body attachment allowance on the right side of the first pipe blank 44 End face on the small diameter side of the inverted truncated cone of the first pipe blank 45 End face on the large diameter side of the inverted truncated cone of the first pipe blank 50 Second pipe blank 51 Body part of the second pipe blank 52 Left side body attachment margin 53 of the second pipe blank Body attachment allowance 54 End face on the small diameter side of the inverted truncated cone of the blank of the second pipe 55 End face on the large diameter side of the inverted truncated cone of the blank of the second pipe 56 Small diameter side of the inverted truncated cone of the blank of the second pipe The apex 57 of the end face of the second pipe blank The concave point of the end face on the narrow diameter side of the inverted truncated cone of the blank of the second pipe

α Apex angle of the inverted truncated cone of the pipe α1 Apex angle of the inverted truncated cone of the first pipe α2 Apex angle of the inverted truncated cone of the second pipe D1 Outer diameter of the large diameter end of the inverted truncated cone of the first pipe ( diameter)
D2 Outer diameter (diameter) of the narrow end of the inverted truncated cone of the first pipe
D3 Outer diameter (diameter) of the large diameter end of the inverted truncated cone of the second pipe
D4 Outer diameter (diameter) of the narrow end of the inverted truncated cone of the second pipe
d1 Inner diameter (diameter) of the large diameter end of the inverted truncated cone of the first pipe
d2 Inner diameter (diameter) of the narrow end of the inverted truncated cone of the first pipe
d3 Inner diameter (diameter) of the large diameter end of the inverted truncated cone of the second pipe
d4 Inner diameter (diameter) of the narrow end of the inverted truncated cone of the second pipe

Claims (8)

A multi-stage straw consisting of a first pipe and a second pipe inserted into a hollow part of the first pipe,
The first pipe and the second pipe have sides of an inverted truncated cone,
The outer diameter of the large diameter end of the inverted truncated cone of the second pipe is larger than the inner diameter of the small diameter end of the inverted truncated cone of the first pipe,
Furthermore, the outer diameter of the end of the large diameter side of the inverted truncated cone of the second pipe is smaller than the inner diameter of the end of the large diameter side of the inverted truncated cone of the first pipe,
The first pipe and the second pipe are pipes in which a sheet is rolled into a cylindrical shape,
A multistage straw characterized in that the winding direction of the first pipe and the winding direction of the second pipe are opposite to each other . The multi-stage straw according to claim 1, wherein the first pipe and the second pipe have sides of an inverted truncated cone with the same apex angle. The outer surface near the large-diameter end of the inverted truncated cone of the second pipe and the inner surface near the narrow-diameter end of the inverted truncated cone of the first pipe are the same as the side surface of the inverted truncated cone. The multi-stage straw according to claim 1 or 2, characterized in that the straws are in contact with each other at a width of 5 mm or more and 50 mm or less in the ridge direction. The multi-stage straw according to any one of claims 1 to 3 , wherein a pointed end is provided at an end on the narrow diameter side of the inverted truncated cone of the body-attached portion of the second pipe. A claim characterized in that the first pipe and/or the second pipe have a uniform thickness in a cut plane perpendicular to the central axis in the longitudinal direction thereof. The multistage straw according to any one of items 1 to 4 . 6. The multi-stage straw according to claim 1, further comprising means for fixing the first pipe and the second pipe on the inner surface of the first pipe. 7. The multi-stage straw according to claim 1, further comprising means for fixing the first pipe and the second pipe on the outer surface of the second pipe. Any one of claims 1 to 7 , characterized in that means for preventing the second pipe from falling off is provided at the end of the larger diameter side of the inverted truncated cone of the first pipe or in the vicinity of the end. The multi-stage straw described in item 1.

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