JPH09234808A - Paper tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to freely deform a paper tube in an axial direction and to easily mount the tube even when the tube is not drawn from a covering member. SOLUTION: The paper tube is formed of an inner layer 2 and an outer layer 3. The layer 2 has an inside winding paper piece 21 and a sheet-like inner coating member 22 adhered to cover the piece 21 from the inside of the tube. The piece 21 is wound so that the gap 24 is formed between the edges in the lateral direction. On the other hand, the layer 3 has an outside winding paper piece 31 and a sheath covering member 32 adhered so as to cover the piece 31 from the outside of the tube. The piece 31 is bridged between the edges of the outer periphery of the piece 21, wound so that a gap 34 is formed between the lateral edges so that the outer periphery of the piece 21 and the outer periphery of the piece 31 can axially slidably move.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a paper tube formed by sequentially winding long wound paper pieces.

[0002]

2. Description of the Related Art Conventionally, as a paper tube formed by sequentially winding a long wound paper piece, for example, one shown in FIG. 9 is known. The paper tube shown in FIG. 9 is
Inner winding paper piece a, middle winding paper piece b, and outer winding paper piece c
And a cylindrical tube provided with. Specifically, the inner-wrapping paper piece a is coated with an adhesive on the left end edge a1 on the back surface, and is wound spirally in order from the left side to the right side so that the edges a1 and a1 overlap each other. The middle-rolled paper piece b is coated with an adhesive on the entire back surface, and is wound spirally in order so that the edges b1 and b1 overlap each other on the outer peripheral surface of the wound inner-rolled paper piece a. There is. Further, the outer-wrapping paper piece c is coated with an adhesive on the entire back surface, and is wound spirally in order so that the edges c1 and c1 overlap with each other on the outer peripheral surface of the wound middle-wrapping paper piece b. It is a thing. However, in the paper tube thus formed, the inner winding paper piece a, the middle winding paper piece b, and the outer winding paper piece c are adhered to each other. Is determined, and it is impossible to appropriately deform a linearly formed one into a curved one. Therefore, for example, even if you insert a part of a product such as a bicycle into a prefabricated paper tube and try to cover the outer surface of the product with the paper tube to protect it, if the part of the product is curved in the axial direction, It cannot be used for applying to a curved member after forming a paper tube. Therefore, there is a problem that the use range of the paper tube is limited and the paper tube cannot be effectively used. Also, for example, if a part of the bicycle is inserted into the paper tube and covered while it is being assembled, the paper tube is removed when the bicycle is used after the assembly is completed, but other parts are attached at that time. If it is, it may not be possible to pull out the paper core. Therefore, in such a case, the paper tube must be broken and removed, but since the inner winding paper piece a, the middle winding paper piece b, and the outer winding paper piece c are firmly adhered to each other, It is difficult to break.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above circumstances, and can be freely deformed in the axial direction, and can be easily removed even if it cannot be removed from the covered member. A first object of the present invention is to provide a paper tube that can be used.

According to the present invention, the axial direction can be freely deformed and can be easily removed even if it does not come off from the covered member, and it is against the force for bending the axial direction. A second object is to provide a paper tube having strength.

[0005]

The present invention solves the above-mentioned problems by providing a paper tube having the following features. 1st invention of this application consists of what provided the winding paper piece 21 and 31 of a predetermined width which consists of elongate, and the covering members 22 and 32 which cover the winding paper piece 21 and 31 from the inside or the outside, The wound paper pieces 21 and 31 are sequentially wound so that the edges 21a, 21a, 31a, and 31a in the width direction are wound.
A tubular shape having gaps 24, 34 between them is formed. And
Due to the gaps 24 and 34, the central axes of the cylindrical rolled paper pieces 21 and 31 can be deformed into a curved shape. The covering members 22 and 32 are made of a sheet-like member so that the covering members 22 and 32 can be deformed together with the deformation of the central axes of the wound paper pieces 21 and 31. .

The second invention of the present application includes an inner layer 2 and an outer layer 3 arranged on the outer peripheral side of the inner layer 2. At least one of the inner layer 2 and the outer layer 3 is provided with winding paper pieces 21 and 31 each having a predetermined width and having a long shape.
By winding 1 and 31 in order, the gaps 24 and 3 are formed between the edges 21a, 21a, 31a and 31a in the width direction.
4 has a tubular shape. The central axes of the rolled paper pieces 21 and 31 formed in a tubular shape can be deformed into a curved shape by the gaps 24 and 34.

In the third invention of the present application, at least one of the inner layer 2 and the outer layer 3 according to the second invention of the present application is a winding paper piece 21 or 31 of a predetermined width which is long and is wound. It is provided with sheet-like covering members 22 and 32 for covering the paper pieces 21 and 31 from the inside or the outside. The covering members 22 and 32 are adhered to the wound paper pieces 21 and 31, so that the covering members 22 and 32 are wound on the wound paper piece 2.
It is designed such that they can be deformed together with the deformations of 1 and 31.

The fourth aspect of the present invention comprises an inner layer 2 and an outer layer 3 arranged on the outer peripheral side of the inner layer 2. The inner layer 2 includes an elongated inner-wrapping paper piece 21 having a predetermined width and a sheet-like inner covering member 22 that covers the inner-wrapping paper piece 21 from the inside. Further, since the inner-wound paper piece 21 is sequentially wound, the inner-wound paper piece 21 has the edges 21a, 21 in the width direction.
A cylindrical shape having a gap 24 between a is formed, and the central axis of the cylindrically-formed inner paper sheet 21 can be deformed into a curved shape by the gap 24. The inner coating member 22 is
By being adhered to the inner wrapping paper piece 21, the inner covering member 22 is deformed together with the deformation of the inner wrapping paper piece 21.
The outer layer 3 is an outer-wrapping paper piece 31 having a predetermined width and having a long shape.
And a sheet-shaped outer covering member 32 for covering the outer wound paper piece 31 from the outside. The outer-wrapped paper piece 31 is sequentially wound, so that the outer-wrapped paper piece 31 has the edge 3 in the width direction.
A tubular shape having a gap 34 between 1a and 31a is formed, and the central axis of the outer winding paper piece 31 formed in the tubular shape can be deformed into a curved shape by the gap 34. The outer covering member 32 is adhered to the outer winding paper piece 31,
The outer covering member 22 deforms together with the deformation of the outer-wrapping paper piece 31. Then, the inner and outer wound paper pieces 21 and the outer wound paper pieces 31 are configured to be slidable in the axial direction with respect to each other.

In the fifth invention of the present application, the outer winding paper piece 31 according to the fourth invention of the present application is the gap 2 in the inner winding paper piece 21.
It is arranged so that it may be passed between the edges 21a forming 21.

In the sixth invention of the present application, the slit 6 cut from the outer circumference to the inner circumference of the paper tube according to the first to fifth inventions of the present application is formed in a spiral shape along the axial direction. .

In the first invention of the present application configured as described above, the wound paper pieces 21, 31 and the covering members 22, 3,
2 and the winding paper pieces 21, 31 are sequentially wound so as to form a tubular shape having gaps 24, 34 between the edges 21a, 21a, 31a, 31a in the width direction, Due to the gaps 24 and 34, the central axes of the rolled paper pieces 21 and 31 formed in a tubular shape can be deformed into a curved shape. In addition, the gaps 24 and 34 are covered by the covering members 22 and 32.
The rolled sheets 21 and 3 of the cylindrical shape are covered by
The inside of 1 can be shut off from the outside. On the other hand, the covering member 22,
By configuring 32 as a sheet-shaped member, when the central axes of the wound paper pieces 21, 31 are deformed into a curved shape, the wound paper pieces 21, 31 are wound around the gaps 24, 34 with wrinkles or the like. It can be deformed together with the turning paper pieces 21 and 31.

In the second invention of the present application, an edge 21 in the width direction is provided on at least one of the inner layer 2 and the outer layer 3.
a, 21a, 31a, 31a are provided with cylindrical winding paper pieces 21 and 31 having gaps 24 and 34 between them,
Due to the gaps 24 and 34, it is possible to deform the central axes of the winding paper pieces 21 and 31 formed in a tubular shape into a curved shape.
It is possible to deform the central axis of the entire paper tube into a curved shape. In addition, the wound paper pieces 21, 31 are replaced by the wound paper pieces 21, 3
Since it is not adhered to the layer opposite to the layer provided with 1,
The wound paper pieces 21 and 31 can be easily unwound.

In the third invention of the present application, the rolled paper piece 21 is covered by the sheet-shaped covering members 22 and 23 so as to be adhered from inside or outside of the rolled paper piece 21 or 31 having a cylindrical shape. , 31 in the width direction of the edges 21a, 21
a, 31a, gaps 24, 34 formed between 31a
Can be kept constant at all times. Further, when the center axes of the wound paper pieces 21 and 31 are deformed, since the covering members 22 and 23 are made of thin paper, they can be deformed together with the wound paper pieces 21 and 31.

In the fourth invention of the present application, the inner layer 2 is provided with an inner winding paper piece 21 and a sheet-shaped inner covering member 22, and the outer layer 3 is provided with an outer winding paper piece 31 and an outer covering member 32. And. By doing so, for example, in FIG.
As shown in FIG. 3, when the left end side of the paper tube 1 is held from the state where the central axis O is straightened and the right side portion separated by a predetermined distance is pressed downward, the pressing force of the upper side of the paper tube 1 The inner layer 2 and the outer layer 3 are pulled in the axial direction by a tensile force P1 applied to the inner layer 2 and the outer layer 3, while the lower inner layer 2 and the outer layer 3 are compressed in the axial direction by a compressive force P2. Become. When the pulling force P1 is applied to the upper side of the paper tube 1, the gap 24 between the edges 21a and 21a of the inner winding paper piece 21 and the gap 34 between the edges 31a and 31a of the outer winding paper piece 31 are generated. Although a force to spread is applied, the inner coating member 22 of the inner layer 2 and the outer coating member 32 of the outer layer 3 on the lower side of the inner layer 2 of the inner layer 2 of the inner layer 2 and the outer layer 3 of the outer layer 3 against the force. Edges 21a, 2 of each of the outer winding paper pieces 31
Wrinkles are formed in the gaps 24, 34 between the la 1a 31a, 31a to narrow the gaps 24, 34 in the inner wound paper piece 21 of the inner layer 2 and the outer wound paper piece 31 of the outer layer 3, respectively, and absorb the force. At that time, when the outer layer 3 and the inner layer 2 are simultaneously deformed into a curved shape, the radius of curvature of the inner layer 2 becomes smaller than that of the outer layer 3, so that the edge 21 of the inner winding sheet piece 21 of the inner layer 2 is reduced.
The gap 24 between a and 21a is the outer wound paper piece 31 of the outer layer 3.
It is necessary to be narrower than the gap 34 between the end edges 31a and 31a at. However, in the fourth embodiment of the present application, the outer surface of the inner winding paper piece 21 of the inner layer 2 and the inner surface of the outer winding paper piece 31 of the outer layer 3 are not adhered to each other and may slide in the axial direction. Therefore, the inner winding paper piece 21 and the outer winding paper piece 31 can move independently of each other. Therefore, the inner-wound paper piece 21 and the outer-wound paper piece 31 do not restrict their movements relative to each other, and the edges 21a, 21a,
It is possible to change the interval between 31a and 31a and to deform it into a curved shape having a radius of curvature according to the pulling force P1. on the other hand,
When the compressive force P2 is applied to the lower side of the paper tube 1, the inner covering member 22 of the inner layer 2 causes the edge 21 of the inner wound paper piece 21 to be absorbed, as in the case where the tensile force P1 applied to the upper side is absorbed.
While creating a wrinkle in the gap 24 between a and 21a, the edge 2
The gap 24 between the 1a and 21a is narrowed, and the outer covering member 32 of the outer layer 3 also narrows the gap 34 while forming a wrinkle in the gap 34 between the edges 31a and 31a of the outer winding paper piece 31. Even in this case, the gap 34 of the outer-wrapping paper piece 31
However, the outer surface of the inner wrapping paper piece 21 of the inner layer 2 and the inner surface of the outer wrapping paper piece 31 of the outer layer 3 are bonded to each other. Since it does not, it can slide in the axial direction with respect to each other, so that the inner winding paper piece 21 and the outer winding paper piece 31 can move independently of each other. Therefore, the inner wound paper piece 21 and the outer wound paper piece 31 do not restrict the movement of each other, and the gaps 24, 34 between the respective end edges 21a, 21a, 31a, 31a.
And can be deformed into a curved shape having a radius of curvature according to the compressive force P2.

In the fifth invention of the present application, the inner winding paper piece 21 and the outer winding paper piece 31 are passed between the edges 21a, 21a of the inner winding paper piece 21 forming the gap 24. Since it is coordinated, it can be made strong against the force that tends to bend the central axis, and can be prevented from being crushed during handling or use.

In the sixth aspect of the present invention, the paper slit can be unwound by the spiral slit 6, and can be easily wound around another member having a curved portion.
Moreover, if the slit 6 is formed in the same direction as the winding direction of the covering member 32 or the wound paper piece as shown in FIG. 5, after the winding, the covering member 32 or the wound paper piece is wound. Due to the strong elasticity, the tube can be naturally returned to its original state.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a partially enlarged sectional view of an embodiment of the paper tube of the present invention.
FIG. 4 is an explanatory diagram when manufacturing the paper tube of the present invention.

The paper tube 1 of the present invention comprises an inner layer 2 and an outer layer 3. The inner layer 2 in the present embodiment includes an inner wrapping paper piece 21 and an inner wrapping paper piece 21 which are long and have a predetermined width.
And an inner covering member 22 for covering the inside of the pipe from the inside.

The inner wrapping paper piece 21 has a width of about 6 mm,
It is made of paper having a thickness of about 0.5 mm.
The width and thickness of the inner-rolled paper piece 21 are not particularly limited and can be changed as appropriate, but if the thickness of the inner-rolled paper piece 21 is such that wrinkles do not occur in the width direction, the strength of the entire tube 1 can be provided. It is preferable because it can be obtained. On the other hand, the inner covering member 22 is made of thin paper having a width of about 15 mm and a thickness of 0.1 mm or less. The width of the inner coating member 22 is not particularly limited, and the thickness may be any thickness as long as it is easy to cause wrinkles and slack in the width direction, and can be appropriately changed.

The outer layer 3 is provided with an elongate outer winding paper piece 31 having a predetermined width and an outer covering member 32 for covering the outer winding paper piece 31 from the outside of the tube.

The outer winding paper piece 31 is the same as the inner winding paper piece 21, and the outer covering member 32 is the same as the inner covering member 22. Specifically, the outer-wrapping paper piece 31 has a width of about 6 mm and a thickness of 0.
The outer cover member 32 is made of thin paper having a thickness of about 5 mm and a width of about 15 mm. In addition, these outer wrapping paper pieces 3
The width and thickness of each of the outer cover member 32 and the outer cover member 32 can be changed and used in the same manner as the inner wound paper piece 21 and the inner cover member 22.

The inner layer 2 and the outer layer 3 are formed as follows. First, as shown in FIG. 2, the inner coating member 22 is sequentially spirally wound around the outer periphery of the mandrel M having a predetermined diameter so that no gap is formed between the widthwise edges 22b, 22b. Further, at the time of this winding, an adhesive is applied to the entire surface 22b to be the outer surface to form the adhesive layer 23 (shown in FIG. 1).

Next, the inner winding paper piece 21 is sequentially wound around the outer peripheral surface 22b of the wound inner covering member 22. Further, in this winding, as shown in FIG. 1, a predetermined distance t is provided between the end edges 21a of the inner wound paper piece 21 and 21a.
This is performed so as to form one gap 24. In this embodiment, the gap t1 of the gap 24 is set to about 2 to 3 mm.
By this winding, the inner surface 21 of the inner wound paper piece 21
b is adhered to the adhesive layer 23 formed on the outer periphery of the inner coating member 22, and the inner winding paper piece 21 is covered by the inner coating member 22 from the inner side. Thereby, the cylindrical inner layer 2 is formed.

Thereafter, the outer winding paper piece 31 is successively spirally wound around the outer circumference of the inner winding paper piece 21 in the inner layer 2 formed as shown in FIG. In this winding, the outer winding paper piece 31 is passed between the edges 21a, 21a forming the gap 24 in the inner winding paper piece 21 to close the gap 24 of the inner winding paper piece 21 from the outside. Done. Therefore,
The outer wound paper piece 31 thus wound has a gap 34 between the edges 31a, 31a in the width direction thereof, which is substantially the same as the interval t1 of the gap 24 of the inner wound paper piece 21. Has been done. Further, the inner peripheral surface of the outer-wound paper piece 31 and the outer peripheral surface of the inner-wound paper piece 21 are not bonded to each other only by abutting, but can slide in the axial direction with respect to each other. .

Next, the outer covering member 32 is attached to the outer winding paper piece 3
Around the outer periphery of 1, the end edges 32b, 32b in the width direction are overlapped with each other and wound in a spiral shape. The outer covering member 32 is wound while the adhesive 32 is applied to the entire inner surface 32b to form the adhesive layer 33 (shown in FIG. 1), and the outer covering member 32 is wound by the adhesive layer 33. Edge 32 of
a and 32a adhere to each other. During this winding, the outer covering member 32 is attached to the edges 31a, 31 of the outer wound paper piece 31.
The outer coating member 32 may be wrinkled or slackened in the gap 34 between the a and the gap 34.

The adhesive layers 23 and 33, the inner coating member 22,
The outer cover member 32 and the outer cover member 32 are thinner than the inner wound paper piece 21 and the outer cover member 32, but are shown thick in FIG. 1 for convenience of description. In addition, the overlapping portions of the edges 32b and 32b of the outer covering member 32 have practically no steps, and are therefore omitted in FIG.

As described above, the paper tube 1 including the inner layer 2 and the outer layer 3 is formed. The formed paper tube 1 can be freely deformed into a curved shape when the paper tube 1 is subjected to a force for bending the central axis. This modification will be described with reference to FIG. For example, when the left end side of the paper tube 1 is held from the state where the central axis O is straightened and the right side portion separated by a predetermined distance is pressed downward, the inner layer 2 and the outer layer on the upper side of the paper tube 1 are pressed by the pressing force. 3 is a tensile force P1 on the inner layer 2 and the outer layer 3.
Thus, the inner layer 2 and the outer layer 3 on the lower side are subjected to a compressive force P2 and are axially compressed. When a pulling force P1 is applied to the upper side of the paper tube 1,
Gap 2 between the end edges 21a of the inner-wound paper piece 21 and 21a
4, and a force to spread the gap 34 between the edges 31a and 31a of the outer-wrapping paper piece 31 is applied,
In response to the force, the inner coating member 22 of the inner layer 2 and the outer coating member 32 of the outer layer 3 on the lower side each have an inner winding paper piece 2 of the inner layer 2.
1. End edges 21a and 21 of the outer-wrapping paper piece 31 of the outer layer 3
Wrinkles are formed in the gaps 24, 34 between the a31a, 31a,
Inner winding paper piece 21 of the inner layer 2 and outer winding paper piece 3 of the outer layer 3
1) Narrow each gap 24, 34 to absorb the force. At that time, in order to simultaneously deform the outer layer 3 and the inner layer 2 into a curved shape, the radius of curvature of the inner layer 2 becomes smaller than that of the outer layer 3, so that the edges 21a, 2 of the inner-rolled paper piece 21 of the inner layer 2 are
The gap 24 between the 1a's needs to be narrower than the gap 34 between the end edges 31a, 31a of the outer-wrapping paper piece 31 of the outer layer 3. However, in the present embodiment, the outer surface of the inner winding paper piece 21 of the inner layer 2 and the inner surface of the outer winding paper piece 31 of the outer layer 3 are not adhered and can slide in the axial direction. , Inner winding paper piece 21 and outer winding paper piece 31
Can move independently of and. Therefore, the inner wrapping paper piece 21 and the outer wrapping paper piece 31 change the interval between the respective end edges 21a, 21a without restricting the movement of each other, and have a curved shape with a radius of curvature corresponding to the pulling force P1. It can be transformed into

On the other hand, when the compressive force P2 is applied to the lower side of the paper tube 1, the inner coating member 22 of the inner layer 2 causes the inner-wrapped paper strip to absorb the tensile force P1 applied to the upper side. While narrowing the gap 24 between the edges 21a, 21a while forming a wrinkle in the gap 24 between the edges 21a, 21a of 21
Further, the outer covering member 32 of the outer layer 3 also forms wrinkles in the gap 34 between the end edges 31a and 31a of the outer winding paper piece 31,
The gap 34 is narrowed. Also in this case, the gap 34 of the outer-wrapping paper piece 31 needs to be narrower than the reduction amount of the gap 24 of the inner-wrapping paper piece 21, but the outer surface of the inner-wrapping paper piece 21 of the inner layer 2 Since the inner surface of the outer winding paper piece 31 of the outer layer 3 is not adhered and can slide in the axial direction with respect to each other, the inner winding paper piece 21 and the outer winding paper piece 31 can move independently of each other. You can Therefore, the inner winding paper piece 2
1 and the outer-wrapping paper piece 31 narrow the gaps 24, 34 between the respective end edges 21a, 21a, 31a, 31a without restricting their movements, and have a curved shape with a radius of curvature corresponding to the compression force P2. It can be transformed into In addition, the inner winding paper piece 21 and the outer winding paper piece 31 mutually have the edges 21a, 2
Since it is passed so as to cover the gaps 24 and 34 between the 1a, 31a and 31a, it is possible to make it strong against the radial force and prevent it from being crushed during handling or use.

In the case where the deformation is to be largely bent (the radius of curvature is small), it is preferable that the entire paper tube 1 is previously compressed in the axial direction by hand before applying the bending force. By doing so, as shown in FIG. 8, the inner covering member 22 and the outer covering member 32 each have many wrinkles or slack in the gaps 24 and 34 of the inner winding paper piece 21 and the outer winding paper piece 31, respectively. Becomes Thus, when the pulling force P1 is applied to the upper side, the edges 21a, 2
The gap 24 between the 1a and the edge 31 of the outer winding paper piece 31
The gap 34 between a and 31a spreads independently and independently, and the tensile force P1 can be absorbed, and the inner coating member 22 and the outer coating member 3
Even if 2 is pulled greatly, it can be prevented from breaking.

In this way, the center axis of the paper tube 1 can be freely deformed into a curved shape in response to a force that causes the center axis to bend, so that, for example, the legs of the chair S as shown in FIG. The formed paper tube 1 can be inserted into the curved portion of S1 and the leg S1 can be protected.
As a result, it is possible to prevent scratches and the like during transportation and handling. Further, as shown in FIG. 5, when the paper tube 1 is inserted into the leg S1 of the chair S, and then the reinforcing member S2 is attached to the lower portion between the legs S1 and S1, the paper tube 1 is used during use. It is necessary to break the paper tube 1 because it will not come off. In this case, if the whole is adhered with an adhesive as in the conventional case, it is difficult to break, but in the present invention, the inner winding paper piece 21 and the outer winding paper piece 31 are not adhered. Moreover, since the outer covering member 32 and the inner covering member 22 are made of thin paper, the outer covering member 32 can be easily unwound by breaking the outer covering member 32, and the inner covering member 22 is
The inner winding paper piece 21 can be easily unwound easily by breaking. Therefore, it can be easily removed.

Similarly, it can be inserted into a linear portion or a curved portion of a bicycle, a pipe head, an antenna, or other various rod-shaped products to be used for preventing scratches or the like during transportation or handling. Further, the water pipe can be inserted into a straight portion or a curved portion to be used as a heat retaining pipe, and the water pipe can be prevented from bursting due to freezing. Further, it can be used in a wide variety of ways, such as an electric wiring pipe through which an electric wire is passed inside, various kinds of ducts, or a cushioning member filled with a cushioning material such as styrofoam. Therefore, the range of applications can be expanded compared to the conventional one, and the effective use can be achieved.

In this embodiment, since the adhesive layers 33, 33 are formed when the inner covering member 22 and the outer covering member 32 are wound, the inner covering member 22 and the outer winding paper piece 31 are not covered with each other. In some cases, the inner winding paper piece 21 and the outer winding paper piece 31 are not adhered to each other. Therefore, when the bending force is applied, the inner winding paper piece 21 and the outer winding paper piece 31 are not adhered to each other. , Can move axially with respect to each other. Therefore, even in this case, there is no problem and it can be used as it is. Further, in the present embodiment, the inner coating member 22 of the inner layer 2 is not bonded to its edges 22a and 22a, but the present invention is not limited to this, and for example, the edges 22a and 22a may be stacked and bonded. It can also be carried out.

Further, in this embodiment, the inner winding paper piece 21
The outer winding paper piece 31 and the outer winding paper piece 31 have the same width, but different widths may be used. Further, the edge 21a of each of the inner wound paper piece 21 and the outer wound paper piece 31,
21a, 31a, a gap t between the gaps 24 and 34 between the 31a
No particular limitation is imposed on 1 and t2.
T1 of the gap 24 between the end edges 21a and 21a in
Is formed to have a width equal to or larger than the width of the outer-wrapping paper piece 31, and the edge 31a on one side in the width direction of the outer-wrapping paper piece 31 has the inner-wrapping paper piece 21.
However, in this case, the portion of the gap 24 of the inner winding paper piece 21 which is not covered by the outer winding paper piece 31 is strong against the radial force. Becomes weaker. Therefore, as shown in FIG. 1, the distance t1 between the edges 21a of the inner-wrapping paper piece 21 and the gap 24 between the inner-wrapping paper pieces 21a is equal to or smaller than the width of the outer-winding paper piece 31 and the edge 31 of the outer-winding paper piece 31.
The distance t2 of the gap 34 between the a and the 31a is set to the inner winding paper piece 2
It is preferable in terms of strength that the width is less than or equal to 1 and the both are arranged so as to pass between the gaps 24 and 34.

Further, in the present embodiment, the inner layer 2 and the outer layer 3 are composed of two layers, but they may be composed of one or three or more layers. For more information,
For example, as shown in FIG. 6A, it is composed of a wound paper piece 31 and a sheet-like covering member 32 adhered so as to cover the wound paper piece 31 from the outside, and is composed of only one layer. be able to. Also in this case, when a force that bends the central axis is applied, the covering member 32 wrinkles or loosens in the gap 34 in the wound paper piece 31, and the entire member can be deformed into a curved shape. Further, the inside can be shielded from the outside by the covering member 32. Therefore, for example, when it is used as an electric wiring pipe, it is possible to protect the electric wire passed through the inside and protect the electric wire from dust and scratches.

On the other hand, for example, as shown in FIG. 6 (B), between the inner winding paper piece 21 and the outer winding paper piece 31, a thick medium winding paper piece similar to the inner winding paper piece 21 or the like is provided. The piece 41 may be arranged so as to form a gap 44 between the end edges 41a, 41a, and may be composed of three layers.
Further, for example, as shown in FIG.
Between the outer winding paper piece 31 and the outer winding paper piece 31, a medium winding paper piece 42 made of a sheet of paper, resin, or the like, and its edges 42a, 42a.
It is also possible to dispose them without forming a gap between them so as to be composed of three layers. When the medium-rolled paper pieces 41 and 42 are provided as shown in FIGS. 6B and 6C, the medium-rolled paper pieces 41 and 42 are replaced with the inner-rolled paper piece 21 and the outer-rolled paper piece 31. Without adhering to the medium, or the medium winding paper pieces 41, 42
Can be adhered to one of the inner winding paper piece 21 or the outer winding paper piece 31.

Further, the inner layer 2 and the outer layer 3 are not limited to those constituted by both the wound paper pieces 21 and 31 and the covering member as in the above-mentioned embodiment, and as shown in FIG. One of them may be composed of only the covering member, and can be appropriately changed. Incidentally, FIG. 6D shows a case where the inner layer 2 is composed of only the covering member 22. Therefore, in this case, the inner surface of the wound paper piece 31 of the outer layer 3 and the outer peripheral surface of the covering member 22 forming the inner layer 2 are not bonded.

On the other hand, the shape of the paper tube is not limited to a cylindrical shape having a circular cross section, and may be a tubular shape such as a quadrangle or an ellipse in cross section, which can be appropriately changed. The material of the inner-wrapping paper piece 21 and the outer-wrapping paper piece 31 may be made of paper as a main component, and may be made of, for example, paper as a main component and laminated with a resin layer or a metal foil layer. be able to. on the other hand,
The materials of the inner cover member 22 and the outer cover member 32 are not limited to those made of paper, but synthetic resin sheets, non-woven fabrics,
Alternatively, it may be composed of a sheet-like material mainly composed of paper and laminated with a resin layer or a metal foil layer. If the outer covering member 32 is formed of a sheet-like member mainly made of paper and laminated with a resin layer, the outer covering member 32 is inserted into a curved product and deformed into a curved shape, and then the deformed portion is heated. By processing, the resin layer can be cured in a curved state, and the whole can be formed into a curved shape corresponding to the shape of the product. Further, in this embodiment, both the inner and outer wound paper pieces 21, 31 and the inner and outer covering members 2 are provided.
Each of 2, 32 is made up of one long one and wound in sequence, but either one or two or more is made up of a plurality of long ones, It is also possible to wind the long ones arranged side by side in the axial direction. In this case, when the inner and outer wound paper pieces 21 and 31 are each composed of a plurality of long sheets, adjacent edges are provided side by side with a predetermined interval to form gaps 24 and 34. It should be done.

Further, the paper tube 1 of the present invention is not limited to the one in the form of being used as it is in the tubular shape as described above, and for example, as shown in FIG. 7, a shaft is provided on the side surface of the paper tube 1 from one end to the other end. It is also possible to form the opening 5 that can be opened and closed by cutting the left and right sides by making a notch in the direction. By doing so, it is possible to easily mount the other member having the curved portion along the curved portion.

Further, as shown in FIG. 5, a slit 6 cut from the outer circumference to the inner circumference of the paper tube 1 (the one on the left side in FIG. 5).
May be provided in a spiral shape. By providing such a slit 6, the paper tube 1 is moved to the slit 6
Can be unwound through. Thereby, for example, as shown in FIG. 5, the reinforcing member S is provided on the lower portion between the legs S1 and S1.
After attaching 2, the reinforcing member S2 interferes and cannot be fitted in a tubular shape, but if it is unwound through the slit 6 as described above, it can be easily wound around the curved leg S1 and attached. be able to. Therefore, the tubular shape is particularly convenient for use in a product that cannot be inserted. Moreover, if the slit 6 is formed in the same direction as the winding direction of the covering member 32 or the wound paper piece as shown in FIG. 5, after the winding, the covering member 32 or the wound paper piece is wound. The elasticity due to the rotation works strongly, and it can naturally return to the original tube state. The slits 6 are not limited to those formed in the same direction as the winding direction of the covering member 32 or the wound paper piece,
It can be formed in a direction opposite to the winding direction of the covering member 32 or the wound paper piece, and the lead angle 61 of the slit 6 is the same as or larger than the winding lead angle of the covering member 32 or the wound paper piece, or It can be implemented by making it small. Also, the pitch n2 of the slits 6 is not particularly limited, and the slits 6 can be formed to be the same as or different from the covering member 32 or the wound paper piece. Further, the groove width of the slit 6 may be formed so that the groove width cannot be formed when forming the slit 6, but it may be formed to have a groove width t3 of a predetermined width as shown in FIG. It can be changed appropriately.

[0040]

As described above, according to the first aspect of the present invention, the wound paper piece 2
Due to the gaps 24 and 34 formed in the portions 1 and 31, the central axes of the rolled paper pieces 21 and 31 formed in a tubular shape can be deformed into a curved shape. Further, since the gaps 24 and 34 are covered by the covering members 22 and 32, the inside of the cylindrical wound paper pieces 21 and 31 can be shielded from the outside. On the other hand, by forming the covering members 22 and 32 from sheet-like members, when the central axes of the wound paper pieces 21 and 31 are deformed into a curved shape, the gaps 24 and 34 between the wound paper pieces 21 and 31 are formed.
As a result, wrinkles and the like can be deformed together with the wound paper pieces 21 and 31, and the entire paper tube can be deformed into a curved shape. This allows it to be inserted into a curved part of a bicycle or a chair, for example, to prevent scratches during transportation, to be used for protection, or to be inserted into the straight and curved parts of a water pipe. Thus, it can be widely used for products having various curved portions such as being used for heat retention.

In the second invention of the present application, the central axes of the rolled paper sheets 21 and 31 formed in a tubular shape can be deformed into a curved shape by the gaps 24 and 34, and the central axis of the entire paper tube is curved. It can be deformed into a shape. Also, the rolled paper piece 2
Since the sheets 1 and 31 are not bonded to the layer on the opposite side of the layer provided with the wound paper pieces 21 and 31, the wound paper pieces 21 and 31 can be easily unwound.

In addition to the effect of the second invention of the present application, the third invention of the present application always keeps the gaps 24, 34 formed in the wound paper pieces 21, 31 constant by the sheet-shaped covering members 22, 23. it can. Further, when the center axes of the wound paper pieces 21 and 31 are deformed, since the covering members 22 and 23 are made of thin paper, they can be deformed together with the wound paper pieces 21 and 31, and even the curved portions can be deformed. Can be inserted.

In the fourth invention of the present application, the inner winding paper piece 21 of the inner layer 2 and the outer winding paper piece 31 of the outer layer 3 can slide in the axial direction with respect to each other, and the inner winding paper piece 21 and the outside It can move independently of the winding paper piece 31. Therefore, the inner wrapping paper piece 21 and the outer wrapping paper piece 31 do not restrict their movements relative to each other, but the distance between the respective end edges 21a, 21a is narrowed, and the inner wrapping paper piece 31 responds to the force to bend the center axis. It can be deformed into a curved shape with a different radius of curvature.

In addition to the effect of the fourth invention of the present application, the fifth invention of the present application is such that the inner winding paper piece 21 and the outer winding paper piece 31 are
Since they are arranged so as to cover the gaps between the edges of each other, it is possible to make them strong against the force that tends to bend the central axis, and prevent them from being crushed during handling or use.

The sixth invention of the present application is, in addition to the effect of any one of the first to fifth inventions of the present application, a spiral slit 6
Thus, the paper tube can be unwound and easily wound around another member having a curved portion, and the slit 6 is formed in the same direction as the winding direction of the covering member 32 or the wound paper piece. After the winding, the elasticity of the covering member 32 and the wound paper piece is strongly exerted after the winding, and the original tube state can be naturally returned.

[Brief description of drawings]

FIG. 1 is an enlarged side view of a main part of a paper tube according to an embodiment of the present invention, with a part of the paper tube shown in cross section.

FIG. 2 is an explanatory diagram when forming an inner layer.

FIG. 3 is an explanatory diagram when forming an outer layer.

FIG. 4 is an explanatory cross-sectional view when the central axis of the paper tube is deformed into a curved shape.

FIG. 5 is a side view when the paper tube of the present invention is used in a curved portion of a leg of a chair.

6 (A) to 6 (D) relate to another embodiment of a paper tube, (A) is an explanatory view of an end face of a paper tube composed of only an outer layer, and (B) is an internal view. An explanatory view of the end face of the main part of the paper tube where a medium-outer wound paper piece with a gap is formed between the wound paper piece and the outer wound paper piece, (C) shows the inner wound paper piece and the outer wound paper piece. Between the piece of paper,
FIG. 6 is an end face explanatory view of a main part of a paper tube on which a sheet-shaped medium-outer rolled paper piece is arranged, and (D) is an end face explanatory view of a paper tube in which an inner layer is composed only of an inner coating member.

FIG. 7 is a partial perspective view of an embodiment in which an opening is provided in a paper tube.

FIG. 8 is an enlarged side view of an essential part, which is a partial cross-section when a paper tube is compressed in the axial direction to form a wrinkle in a gap of a wound paper piece.

FIG. 9 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Paper Tube 2 Inner Layer 3 Outer Layer 6 Slit 21 Inner Wound Paper Piece 22 Inner Covering Member 31 Outer Wound Paper Piece 32 Outer Covering Member 24, 34 Gap

[Procedure amendment]

[Submission date] April 11, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of Invention] Paper tube

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a paper tube formed by sequentially winding long wound paper pieces.

[0002]

2. Description of the Related Art Conventionally, as a paper tube formed by sequentially winding a long wound paper piece, for example, one shown in FIG. 9 is known. The paper tube shown in FIG. 9 is
Inner winding paper piece a, middle winding paper piece b, and outer winding paper piece c
And a cylindrical tube provided with. Specifically, the inner-wrapping paper piece a is coated with an adhesive on the left end edge a1 on the back surface, and is wound spirally in order from the left side to the right side so that the edges a1 and a1 overlap each other. The middle-rolled paper piece b is coated with an adhesive on the entire back surface, and is wound spirally in order so that the edges b1 and b1 overlap each other on the outer peripheral surface of the wound inner-rolled paper piece a. There is. Further, the outer-wrapping paper piece c is coated with an adhesive on the entire back surface, and is wound spirally in order so that the edges c1 and c1 overlap with each other on the outer peripheral surface of the wound middle-wrapping paper piece b. It is a thing. However, in the paper tube thus formed, the inner winding paper piece a, the middle winding paper piece b, and the outer winding paper piece c are adhered to each other. Is determined, and it is impossible to appropriately deform a linearly formed one into a curved one. Therefore, for example, even if you insert a part of a product such as a bicycle into a prefabricated paper tube and try to cover the outer surface of the product with the paper tube to protect it, if the part of the product is curved in the axial direction, It cannot be used for applying to a curved member after forming a paper tube. Therefore, there is a problem that the use range of the paper tube is limited and the paper tube cannot be effectively used. Also, for example, if a part of the bicycle is inserted into the paper tube and covered while it is being assembled, the paper tube is removed when the bicycle is used after the assembly is completed, but other parts are attached at that time. If it is, it may not be possible to pull out the paper core. Therefore, in such a case, the paper tube must be broken and removed, but since the inner winding paper piece a, the middle winding paper piece b, and the outer winding paper piece c are firmly adhered to each other, It is difficult to break.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been proposed in view of the above circumstances, and can be freely deformed in the axial direction, and can be easily removed even if it cannot be removed from the covered member. A first object of the present invention is to provide a paper tube that can be used.

The present invention can freely deform in the axial direction and can be easily removed even if it does not come off from the covered member, and it is against the force for bending in the axial direction. A second object is to provide a paper tube having strength.

[0005]

The present invention solves the above-mentioned problems by providing a paper tube having the following features. 1st invention of this application consists of what provided the winding paper piece 21 and 31 of a predetermined width which consists of elongate, and the covering members 22 and 32 which cover the winding paper piece 21 and 31 from the inside or the outside, The wound paper pieces 21 and 31 are sequentially wound so that the edges 21a, 21a, 31a, and 31a in the width direction are wound.
A tubular shape having gaps 24, 34 between them is formed. And
Due to the gaps 24 and 34, the central axes of the cylindrical rolled paper pieces 21 and 31 can be deformed into a curved shape. The covering members 22 and 32 are made of a sheet-like member so that the covering members 22 and 32 can be deformed together with the deformation of the central axes of the wound paper pieces 21 and 31. .

The second invention of the present application includes an inner layer 2 and an outer layer 3 arranged on the outer peripheral side of the inner layer 2. At least one of the inner layer 2 and the outer layer 3 is provided with winding paper pieces 21 and 31 each having a predetermined width and having a long shape.
By winding 1 and 31 in order, the gaps 24 and 3 are formed between the edges 21a, 21a, 31a and 31a in the width direction.
4 has a tubular shape. The central axes of the rolled paper pieces 21 and 31 formed in a tubular shape can be deformed into a curved shape by the gaps 24 and 34.

In the third invention of the present application, at least one of the inner layer 2 and the outer layer 3 according to the second invention of the present application is a winding paper piece 21 or 31 of a predetermined width which is long and is wound. It is provided with sheet-like covering members 22 and 32 for covering the paper pieces 21 and 31 from the inside or the outside. The covering members 22 and 32 are adhered to the wound paper pieces 21 and 31, so that the covering members 22 and 32 are wound on the wound paper piece 2.
It is designed such that they can be deformed together with the deformations of 1 and 31.

The fourth aspect of the present invention comprises an inner layer 2 and an outer layer 3 arranged on the outer peripheral side of the inner layer 2. The inner layer 2 includes an elongated inner-wrapping paper piece 21 having a predetermined width and a sheet-like inner covering member 22 that covers the inner-wrapping paper piece 21 from the inside. Further, since the inner-wound paper piece 21 is sequentially wound, the inner-wound paper piece 21 has the edges 21a, 21 in the width direction.
A cylindrical shape having a gap 24 between a is formed, and the central axis of the cylindrically-formed inner paper sheet 21 can be deformed into a curved shape by the gap 24. The inner coating member 22 is
By being adhered to the inner wrapping paper piece 21, the inner covering member 22 is deformed together with the deformation of the inner wrapping paper piece 21.
The outer layer 3 is an outer-wrapping paper piece 31 having a predetermined width and having a long shape.
And a sheet-shaped outer covering member 32 for covering the outer wound paper piece 31 from the outside. The outer-wrapped paper piece 31 is sequentially wound, so that the outer-wrapped paper piece 31 has the edge 3 in the width direction.
A tubular shape having a gap 34 between 1a and 31a is formed, and the central axis of the outer winding paper piece 31 formed in the tubular shape can be deformed into a curved shape by the gap 34. The outer covering member 32 is adhered to the outer winding paper piece 31,
The outer covering member 32 is deformed together with the deformation of the outer winding paper piece 31. Then, the inner and outer wound paper pieces 21 and the outer wound paper pieces 31 are configured to be slidable in the axial direction with respect to each other.

In the fifth invention of the present application, the outer winding paper piece 31 according to the fourth invention of the present application is the gap 2 in the inner winding paper piece 21.
It is arranged so that it may be passed between the edges 21a forming 21.

In the sixth invention of the present application, the slit 6 cut from the outer circumference to the inner circumference of the paper tube according to the first to fifth inventions of the present application is formed in a spiral shape along the axial direction. .

In the first aspect of the present invention having the above-described structure, the rolled concave paper pieces 21, 31 and the covering members 22, 3 are formed.
2 and the winding paper pieces 21, 31 are sequentially wound so as to form a tubular shape having gaps 24, 34 between the edges 21a, 21a, 31a, 31a in the width direction, Due to the gaps 24 and 34, the central axes of the rolled paper pieces 21 and 31 formed in a tubular shape can be deformed into a curved shape. In addition, the gaps 24 and 34 are covered by the covering members 22 and 32.
The rolled sheets 21 and 3 of the cylindrical shape are covered by
The inside of 1 can be shut off from the outside. On the other hand, the covering member 22,
By configuring 32 as a sheet-shaped member, when the central axes of the wound paper pieces 21, 31 are deformed into a curved shape, the wound paper pieces 21, 31 are wound around the gaps 24, 34 with wrinkles or the like. It can be deformed together with the turning paper pieces 21 and 31.

In the second invention of the present application, an edge 21 in the width direction is provided on at least one of the inner layer 2 and the outer layer 3.
a, 21a, 31a, 31a are provided with cylindrical winding paper pieces 21 and 31 having gaps 24 and 34 between them,
Due to the gaps 24 and 34, it is possible to deform the central axes of the winding paper pieces 21 and 31 formed in a tubular shape into a curved shape.
It is possible to deform the central axis of the entire paper tube into a curved shape. In addition, the wound paper pieces 21, 31 are replaced by the wound paper pieces 21, 3
Since it is not adhered to the layer opposite to the layer provided with 1,
The wound paper pieces 21 and 31 can be easily unwound.

In the third invention of the present application, the rolled paper piece 21 is made by covering and adhering the cylindrical wound paper pieces 21, 31 from inside or outside with the sheet-shaped covering members 22 , 32. , 31 in the width direction of the edges 21a, 21
a, 31a, gaps 24, 34 formed between 31a
Can be kept constant at all times. Further, when the center axes of the wound paper pieces 21 and 31 are deformed, since the covering members 22 and 32 are made of thin paper, they can be deformed together with the wound paper pieces 21 and 31.

In the fourth invention of the present application, the inner layer 2 is provided with an inner winding paper piece 21 and a sheet-shaped inner covering member 22, and the outer layer 3 is provided with an outer winding paper piece 31 and an outer covering member 32. And. By doing so, for example, in FIG.
As shown in FIG. 3, when the left end side of the paper tube 1 is held from the state where the central axis O is straightened and the right side portion separated by a predetermined distance is pressed downward, the pressing force of the upper side of the paper tube 1 The inner layer 2 and the outer layer 3 are pulled in the axial direction by a tensile force P1 applied to the inner layer 2 and the outer layer 3, while the lower inner layer 2 and the outer layer 3 are compressed in the axial direction by a compressive force P2. Become. When the pulling force P1 is applied to the upper side of the paper tube 1, the gap 24 between the edges 21a and 21a of the inner winding paper piece 21 and the gap 34 between the edges 31a and 31a of the outer winding paper piece 31 are generated. Although a force to spread is applied, the inner coating member 22 of the inner layer 2 and the outer coating member 32 of the outer layer 3 on the lower side of the inner layer 2 of the inner layer 2 of the inner layer 2 and the outer layer 3 of the outer layer 3 are applied to the force. Edges 21a, 2 of each of the outer winding paper pieces 31
Wrinkles are formed in the gaps 24, 34 between the lapping portions 1a, 31a, 31a to narrow the gaps 24, 34 in the inner winding paper piece 21 of the inner layer 2 and the outer winding paper piece 31 of the outer layer 3 and absorb the force. At that time, when the outer layer 3 and the inner layer 2 are simultaneously deformed into a curved shape, the radius of curvature of the inner layer 2 becomes smaller than that of the outer layer 3, so that the edge 21 of the inner winding sheet piece 21 of the inner layer 2 is reduced.
The gap 24 between a and 21a is the outer wound paper piece 31 of the outer layer 3.
It is necessary to be narrower than the gap 34 between the end edges 31a and 31a at. However, in the fourth embodiment of the present application, the outer surface of the inner winding paper piece 21 of the inner layer 2 and the inner surface of the outer winding paper piece 31 of the outer layer 3 are not adhered to each other and may slide in the axial direction. Therefore, the inner winding paper piece 21 and the outer winding paper piece 31 can move independently of each other. Therefore, the inner-wound paper piece 21 and the outer-wound paper piece 31 do not restrict their movements relative to each other, and the edges 21a, 21a,
It is possible to change the interval between 31a and 31a and to deform it into a curved shape having a radius of curvature according to the pulling force P1. on the other hand,
When the compressive force P2 is applied to the lower side of the paper tube 1, the inner covering member 22 of the inner layer 2 causes the edge 21 of the inner wound paper piece 21 to be absorbed, as in the case where the tensile force P1 applied to the upper side is absorbed.
While creating a wrinkle in the gap 24 between a and 21a, the edge 2
The gap 24 between the 1a and 21a is narrowed, and the outer covering member 32 of the outer layer 3 also narrows the gap 34 while forming a wrinkle in the gap 34 between the edges 31a and 31a of the outer winding paper piece 31. Even in this case, the gap 34 of the outer-wrapping paper piece 31
However, the outer surface of the inner wrapping paper piece 21 of the inner layer 2 and the inner surface of the outer wrapping paper piece 31 of the outer layer 3 are bonded to each other. Since it does not, it can slide in the axial direction with respect to each other, so that the inner winding paper piece 21 and the outer winding paper piece 31 can move independently of each other. Therefore, the inner wound paper piece 21 and the outer wound paper piece 31 do not restrict the movement of each other, and the gaps 24, 34 between the respective end edges 21a, 21a, 31a, 31a.
And can be deformed into a curved shape having a radius of curvature according to the compressive force P2.

In the fifth invention of the present application, the inner winding paper piece 21 and the outer winding paper piece 31 are passed between the edges 21a, 21a of the inner winding paper piece 21 forming the gap 24. Since it is coordinated, it can be made strong against the force that tends to bend the central axis, and can be prevented from being crushed during handling or use.

In the sixth aspect of the present invention, the paper slit can be unwound by the spiral slit 6, and can be easily wound around another member having a curved portion.
Moreover, if the slit 6 is formed in the same direction as the winding direction of the covering member 32 or the wound paper piece as shown in FIG. 5, after the winding, the covering member 32 or the wound paper piece is wound. Due to the strong elasticity, the tube can be naturally returned to its original state.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a partially enlarged sectional view of an embodiment of the paper tube of the present invention.
FIG. 4 is an explanatory diagram when manufacturing the paper tube of the present invention.

The paper tube 1 of the present invention comprises an inner layer 2 and an outer layer 3. The inner layer 2 in the present embodiment includes an inner wrapping paper piece 21 and an inner wrapping paper piece 21 which are long and have a predetermined width.
And an inner covering member 22 for covering the inside of the pipe from the inside.

The inner wrapping paper piece 21 has a width of about 6 mm,
It is made of paper having a thickness of about 0.5 mm.
The width and thickness of the inner-rolled paper piece 21 are not particularly limited and can be changed as appropriate, but if the thickness of the inner-rolled paper piece 21 is such that wrinkles do not occur in the width direction, the strength of the entire tube 1 can be provided. It is preferable because it can be obtained. On the other hand, the inner covering member 22 is made of thin paper having a width of about 15 mm and a thickness of 0.1 mm or less. The width of the inner coating member 22 is not particularly limited, and the thickness may be any thickness as long as it is easy to cause wrinkles and slack in the width direction, and can be appropriately changed.

The outer layer 3 is provided with an elongate outer winding paper piece 31 having a predetermined width and an outer covering member 32 for covering the outer winding paper piece 31 from the outside of the tube.

The outer winding paper piece 31 is the same as the inner winding paper piece 21, and the outer covering member 32 is the same as the inner covering member 22. Specifically, the outer-wrapping paper piece 31 has a width of about 6 mm and a thickness of 0.
The outer cover member 32 is made of thin paper having a thickness of about 5 mm and a width of about 15 mm. In addition, these outer wrapping paper pieces 3
The width and thickness of each of the outer cover member 32 and the outer cover member 32 can be changed and used in the same manner as the inner wound paper piece 21 and the inner cover member 22.

The inner layer 2 and the outer layer 3 are formed as follows. First, as shown in FIG. 2, the inner coating member 22 is sequentially spirally wound around the outer periphery of the mandrel M having a predetermined diameter so that no gap is formed between the widthwise edges 22b, 22b. Further, at the time of this winding, an adhesive is applied to the entire surface 22b to be the outer surface to form the adhesive layer 23 (shown in FIG. 1).

Next, the inner winding paper piece 21 is sequentially wound around the outer peripheral surface 22b of the wound inner covering member 22. Further, in this winding, as shown in FIG. 1, a predetermined distance t is provided between the end edges 21a of the inner wound paper piece 21 and 21a.
This is performed so as to form one gap 24. In this embodiment, the gap t1 of the gap 24 is set to about 2 to 3 mm.
By this winding, the inner surface 21 of the inner wound paper piece 21
b is adhered to the adhesive layer 23 formed on the outer periphery of the inner coating member 22, and the inner winding paper piece 21 is covered by the inner coating member 22 from the inner side. Thereby, the cylindrical inner layer 2 is formed.

Thereafter, the outer winding paper piece 31 is successively spirally wound around the outer circumference of the inner winding paper piece 21 in the inner layer 2 formed as shown in FIG. In this winding, the outer winding paper piece 31 is passed between the edges 21a, 21a forming the gap 24 in the inner winding paper piece 21 to close the gap 24 of the inner winding paper piece 21 from the outside. Done. Therefore,
The outer wound paper piece 31 thus wound has a gap 34 between the edges 31a, 31a in the width direction thereof, which is substantially the same as the interval t1 of the gap 24 of the inner wound paper piece 21. Has been done. Further, the inner peripheral surface of the outer-wound paper piece 31 and the outer peripheral surface of the inner-wound paper piece 21 are not bonded to each other only by abutting, but can slide in the axial direction with respect to each other. .

Next, the outer covering member 32 is attached to the outer winding paper piece 3
Around the outer periphery of 1, the end edges 32b, 32b in the width direction are overlapped with each other and wound in a spiral shape. The outer covering member 32 is wound while the adhesive 32 is applied to the entire inner surface 32b to form the adhesive layer 33 (shown in FIG. 1), and the outer covering member 32 is wound by the adhesive layer 33. Edge 32 of
a and 32a adhere to each other. During this winding, the outer covering member 32 is attached to the edges 31a, 31 of the outer wound paper piece 31.
The outer coating member 32 may be wrinkled or slackened in the gap 34 between the a and the gap 34.

The adhesive layers 23 and 33, the inner coating member 22,
The outer cover member 32 and the outer cover member 32 are thinner than the inner wound paper piece 21 and the outer cover member 32, but are shown thick in FIG. 1 for convenience of description. In addition, the overlapping portions of the edges 32b and 32b of the outer covering member 32 have practically no steps, and are therefore omitted in FIG.

As described above, the paper tube 1 including the inner layer 2 and the outer layer 3 is formed. The formed paper tube 1 can be freely deformed into a curved shape when the paper tube 1 is subjected to a force for bending the central axis. This modification will be described with reference to FIG. For example, when the left end side of the paper tube 1 is held from the state where the central axis O is straightened and the right side portion separated by a predetermined distance is pressed downward, the inner layer 2 and the outer layer on the upper side of the paper tube 1 are pressed by the pressing force. 3 is a tensile force P1 on the inner layer 2 and the outer layer 3.
Thus, the inner layer 2 and the outer layer 3 on the lower side are subjected to a compressive force P2 and are axially compressed. When a pulling force P1 is applied to the upper side of the paper tube 1,
Gap 2 between the end edges 21a of the inner-wound paper piece 21 and 21a
4, and a force to spread the gap 34 between the edges 31a and 31a of the outer-wrapping paper piece 31 is applied,
In response to the force, the inner coating member 22 of the inner layer 2 and the outer coating member 32 of the outer layer 3 on the lower side each have an inner winding paper piece 2 of the inner layer 2.
1. End edges 21a and 21 of the outer-wrapping paper piece 31 of the outer layer 3
Wrinkles are formed in the gaps 24, 34 between the a, 31a, 31a to narrow the gaps 24, 34 in the inner winding paper piece 21 of the inner layer 2 and the outer winding paper piece 31 of the outer layer 3, respectively, and absorb the force. At that time, when the outer layer 3 and the inner layer 2 are simultaneously deformed into a curved shape, the radius of curvature of the inner layer 2 becomes smaller than that of the outer layer 3, so that the edge 21 of the inner winding sheet piece 21 of the inner layer 2 is reduced.
The gap 24 between a and 21a is the outer wound paper piece 31 of the outer layer 3.
It is necessary to be narrower than the gap 34 between the end edges 31a and 31a at. However, in the present embodiment, the outer surface of the inner winding paper piece 21 of the inner layer 2 and the inner surface of the outer winding paper piece 31 of the outer layer 3 are not adhered and can slide in the axial direction. The inner wound paper piece 21 and the outer wound paper piece 31 can move independently of each other. Therefore, the inner wrapping paper piece 21 and the outer wrapping paper piece 31 change the interval between the respective end edges 21a, 21a without restricting the movement of each other, and have a curved shape with a radius of curvature corresponding to the pulling force P1. It can be transformed into

On the other hand, when the compressive force P2 is applied to the lower side of the paper tube 1, the inner coating member 22 of the inner layer 2 causes the inner-wrapped paper strip to absorb the tensile force P1 applied to the upper side. While narrowing the gap 24 between the edges 21a, 21a while forming a wrinkle in the gap 24 between the edges 21a, 21a of 21
Further, the outer covering member 32 of the outer layer 3 also forms wrinkles in the gap 34 between the end edges 31a and 31a of the outer winding paper piece 31,
The gap 34 is narrowed. Also in this case, the gap 34 of the outer-wrapping paper piece 31 needs to be narrower than the reduction amount of the gap 24 of the inner-wrapping paper piece 21, but the outer surface of the inner-wrapping paper piece 21 of the inner layer 2 Since the inner surface of the outer winding paper piece 31 of the outer layer 3 is not adhered and can slide in the axial direction with respect to each other, the inner winding paper piece 21 and the outer winding paper piece 31 can move independently of each other. You can Therefore, the inner winding paper piece 2
1 and the outer-wrapping paper piece 31 narrow the gaps 24, 34 between the respective end edges 21a, 21a, 31a, 31a without restricting their movements, and have a curved shape with a radius of curvature corresponding to the compression force P2. It can be transformed into In addition, the inner winding paper piece 21 and the outer winding paper piece 31 mutually have the edges 21a, 2
Since it is passed so as to cover the gaps 24 and 34 between the 1a, 31a and 31a, it is possible to make it strong against the radial force and prevent it from being crushed during handling or use.

In the case where the deformation is to be largely bent (the radius of curvature is small), it is preferable that the entire paper tube 1 is previously compressed in the axial direction by hand before applying the bending force. By doing so, as shown in FIG. 8, the inner covering member 22 and the outer covering member 32 each have many wrinkles or slack in the gaps 24 and 34 of the inner winding paper piece 21 and the outer winding paper piece 31, respectively. Becomes Thus, when the pulling force P1 is applied to the upper side, the edges 21a, 2
The gap 24 between the 1a and the edge 31 of the outer winding paper piece 31
The gap 34 between a and 31a spreads independently and independently, and the tensile force P1 can be absorbed, and the inner coating member 22 and the outer coating member 3
Even if 2 is pulled greatly, it can be prevented from breaking.

In this way, the center axis of the paper tube 1 can be freely deformed into a curved shape in response to a force that causes the center axis to bend, so that, for example, the legs of the chair S as shown in FIG. The formed paper tube 1 can be inserted into the curved portion of S1 and the leg S1 can be protected.
As a result, it is possible to prevent scratches and the like during transportation and handling. Further, as shown in FIG. 5, when the paper tube 1 is inserted into the leg S1 of the chair S, and then the reinforcing member S2 is attached to the lower portion between the legs S1 and S1, the paper tube 1 is used during use. It is necessary to break the paper tube 1 because it will not come off. In this case, if the whole is adhered with an adhesive as in the conventional case, it is difficult to break, but in the present invention, the inner winding paper piece 21 and the outer winding paper piece 31 are not adhered. Moreover, since the outer covering member 32 and the inner covering member 22 are made of thin paper, the outer covering member 32 can be easily unwound by breaking the outer covering member 32, and the inner covering member 22 is
The inner winding paper piece 21 can be easily unwound easily by breaking. Therefore, it can be easily removed.

Similarly, it can be inserted into a linear portion or a curved portion of a bicycle, a pipe head, an antenna, or other various rod-shaped products to be used for preventing scratches or the like during transportation or handling. Further, the water pipe can be inserted into a straight portion or a curved portion to be used as a heat retaining pipe, and the water pipe can be prevented from bursting due to freezing. Further, it can be used in a wide variety of ways, such as an electric wiring pipe through which an electric wire is passed inside, various kinds of ducts, or a cushioning member filled with a cushioning material such as styrofoam. Therefore, the range of applications can be expanded compared to the conventional one, and the effective use can be achieved.

In this embodiment, since the adhesive layers 23 and 33 are formed when the inner covering member 22 and the outer covering member 32 are wound, the inner covering member 22 and the outer winding paper piece 31 are not covered with each other. In some cases, the inner winding paper piece 21 and the outer winding paper piece 31 are not adhered to each other. Therefore, when the bending force is applied, the inner winding paper piece 21 and the outer winding paper piece 31 are not adhered to each other. , Can move axially with respect to each other. Therefore, even in this case, there is no problem and it can be used as it is. Further, in the present embodiment, the inner coating member 22 of the inner layer 2 is not bonded to its edges 22a and 22a, but the present invention is not limited to this, and for example, the edges 22a and 22a may be stacked and bonded. It can also be carried out.

Further, in this embodiment, the inner winding paper piece 21
The outer winding paper piece 31 and the outer winding paper piece 31 have the same width, but different widths may be used. Further, the edge 21a of each of the inner wound paper piece 21 and the outer wound paper piece 31,
21a, 31a, a gap t between the gaps 24 and 34 between the 31a
No particular limitation is imposed on 1 and t2.
T1 of the gap 24 between the end edges 21a and 21a in
Is formed to have a width equal to or larger than the width of the outer-wrapping paper piece 31, and the edge 31a on one side in the width direction of the outer-wrapping paper piece 31 has the inner-wrapping paper piece 21.
However, in this case, the portion of the gap 24 of the inner winding paper piece 21 which is not covered by the outer winding paper piece 31 is strong against the radial force. Becomes weaker. Therefore, as shown in FIG. 1, the distance t1 between the edges 21a of the inner-wrapping paper piece 21 and the gap 24 between the inner-wrapping paper pieces 21a is equal to or smaller than the width of the outer-winding paper piece 31 and the edge 31 of the outer-winding paper piece 31.
The distance t2 of the gap 34 between the a and the 31a is set to the inner winding paper piece 2
It is preferable in terms of strength that the width is less than or equal to 1 and the both are arranged so as to pass between the gaps 24 and 34.

Further, in the present embodiment, the inner layer 2 and the outer layer 3 are composed of two layers, but they may be composed of one or three or more layers. For more information,
For example, as shown in FIG. 6A, it is composed of a wound paper piece 31 and a sheet-shaped covering member 32 adhered so as to cover the wound paper piece 31 from the outside, and is composed of only one layer. be able to. Also in this case, when a force that bends the central axis is applied, the covering member 32 wrinkles or loosens in the gap 34 in the wound paper piece 31, and the entire member can be deformed into a curved shape. Further, the inside can be shielded from the outside by the covering member 32. Therefore, for example, when it is used as an electric wiring pipe, it is possible to protect the electric wire passed through the inside and protect the electric wire from dust and scratches.

On the other hand, for example, as shown in FIG. 6 (B), between the inner winding paper piece 21 and the outer winding paper piece 31, a thick medium winding paper similar to the inner winding paper piece 21 or the like is provided. The piece 41 may be arranged so as to form a gap 44 between the end edges 41a, 41a, and may be composed of three layers. Further, for example, as shown in FIG. 6C, an intermediate winding paper piece 42 made of a sheet of paper, resin, or the like is provided between the inner winding paper piece 21 and the outer winding paper piece 31. Edge 42a, 4
It is arranged without forming a gap between the 2a,
It can also consist of three layers. Note that FIG.
(B) When the medium-rolled paper pieces 41 and 42 are provided as shown in (C), the medium-rolled paper pieces 41 and 42 are replaced with the inner-rolled paper piece 2
1 or the outer winding paper piece 31 may not be adhered, or the middle winding paper piece 41 or 42 may be adhered to one of the inner winding paper piece 21 or the outer winding paper piece 31. .

Further, the inner layer 2 and the outer layer 3 are not limited to the ones composed of the wound paper pieces 21 and 31 and the covering member as in the above-mentioned embodiment, and as shown in FIG. 6D, for example.
Either one may be composed of only the covering member, and can be appropriately changed. Note that FIG. 6D shows a case where the inner layer 2 is composed of only the covering member 22. Therefore, in this case, the inner surface of the wound paper piece 31 of the outer layer 3 and
The outer peripheral surface of the covering member 22 forming the inner layer 2 is not adhered.

On the other hand, the shape of the paper tube is not limited to a cylindrical shape having a circular cross section, and may be a tubular shape such as a quadrangle or an ellipse in cross section, which can be appropriately changed. The material of the inner-wrapping paper piece 21 and the outer-wrapping paper piece 31 may be made of paper as a main component, and may be made of, for example, paper as a main component and laminated with a resin layer or a metal foil layer. be able to. on the other hand,
The materials of the inner cover member 22 and the outer cover member 32 are not limited to those made of paper, but synthetic resin sheets, non-woven fabrics,
Alternatively, it may be composed of a sheet-like material mainly composed of paper and laminated with a resin layer or a metal foil layer. If the outer covering member 32 is formed of a sheet-like member mainly made of paper and laminated with a resin layer, the outer covering member 32 is inserted into a curved product and deformed into a curved shape, and then the deformed portion is heated. By processing, the resin layer can be cured in a curved state, and the whole can be formed into a curved shape corresponding to the shape of the product. Further, in this embodiment, both the inner and outer wound paper pieces 21, 31 and the inner and outer covering members 2 are provided.
Each of 2, 32 is made up of one long one and wound in sequence, but either one or two or more is made up of a plurality of long ones, It is also possible to wind the long ones arranged side by side in the axial direction. In this case, when the inner and outer wound paper pieces 21 and 31 are each composed of a plurality of long sheets, adjacent edges are provided side by side with a predetermined interval to form gaps 24 and 34. It should be done.

Further, the paper tube 1 of the present invention is not limited to the one in the form of being used as it is in the tubular shape as described above, and for example, as shown in FIG. 7, a shaft is provided on the side surface of the paper tube 1 from one end to the other end. It is also possible to form the opening 5 that can be opened and closed by cutting the left and right sides by making a notch in the direction. By doing so, it is possible to easily mount the other member having the curved portion along the curved portion.

Further, as shown in FIG. 5, a slit 6 cut from the outer circumference to the inner circumference of the paper tube 1 (the one on the left side in FIG. 5).
May be provided in a spiral shape. By providing such a slit 6, the paper tube 1 is moved to the slit 6
Can be unwound through. Thereby, for example, as shown in FIG. 5, the reinforcing member S is provided on the lower portion between the legs S1 and S1.
After attaching 2, the reinforcing member S2 interferes and cannot be fitted in a tubular shape, but if it is unwound through the slit 6 as described above, it can be easily wound around the curved leg S1 and attached. be able to. Therefore, the tubular shape is particularly convenient for use in a product that cannot be inserted. Moreover, if the slit 6 is formed in the same direction as the winding direction of the covering member 32 or the wound paper piece as shown in FIG. 5, after the winding, the covering member 32 or the wound paper piece is wound. The elasticity due to the rotation works strongly, and it can naturally return to the original tube state. The slits 6 are not limited to those formed in the same direction as the winding direction of the covering member 32 or the wound paper piece,
It can be formed in a direction opposite to the winding direction of the covering member 32 or the wound paper piece, and the lead angle 61 of the slit 6 is the same as or larger than the winding lead angle of the covering member 32 or the wound paper piece, or It can be implemented by making it small. Further, the pitch n of the slits 6 is not particularly limited, and the slits 6 can be formed to be the same as or different from the covering member 32 and the wound paper piece. Further, the groove width of the slit 6 may be formed so that the groove width is not formed when the slit 6 is formed.
It may be formed to have a groove width t3 of a predetermined width as shown in FIG.

[0040]

As described above, according to the first aspect of the present invention, the wound paper piece 2
Due to the gaps 24 and 34 formed in the portions 1 and 31, the central axes of the rolled paper pieces 21 and 31 formed in a tubular shape can be deformed into a curved shape. Further, since the gaps 24 and 34 are covered by the covering members 22 and 32, the inside of the cylindrical wound paper pieces 21 and 31 can be shielded from the outside. On the other hand, by forming the covering members 22 and 32 from sheet-like members, when the central axes of the wound paper pieces 21 and 31 are deformed into a curved shape, the gaps 24 and 34 between the wound paper pieces 21 and 31 are formed.
As a result, wrinkles and the like can be deformed together with the wound paper pieces 21 and 31, and the entire paper tube can be deformed into a curved shape. This allows it to be inserted into a curved part of a bicycle or a chair, for example, to prevent scratches during transportation, to be used for protection, or to be inserted into the straight and curved parts of a water pipe. Thus, it can be widely used for products having various curved portions such as being used for heat retention.

In the second invention of the present application, the central axes of the rolled paper sheets 21 and 31 formed in a tubular shape can be deformed into a curved shape by the gaps 24 and 34, and the central axis of the entire paper tube is curved. It can be deformed into a shape. Also, the rolled paper piece 2
Since the sheets 1 and 31 are not bonded to the layer on the opposite side of the layer provided with the wound paper pieces 21 and 31, the wound paper pieces 21 and 31 can be easily unwound.

In addition to the effect of the second invention of the present application, the third invention of the present application keeps the gaps 24, 34 formed in the wound paper pieces 21, 31 constant at all times by the sheet-shaped covering members 22 , 32 . it can. Further, when the center axes of the wound paper pieces 21 and 31 are deformed, since the covering members 22 and 32 are made of thin paper, they can be deformed together with the wound paper pieces 21 and 31, and even the curved portions can be deformed. Can be inserted.

In the fourth invention of the present application, the inner winding paper piece 21 of the inner layer 2 and the outer winding paper piece 31 of the outer layer 3 can slide in the axial direction with respect to each other, and the inner winding paper piece 21 and the outside It can move independently of the winding paper piece 31. Therefore, the inner wrapping paper piece 21 and the outer wrapping paper piece 31 do not restrict their movements relative to each other, but the distance between the respective end edges 21a, 21a is narrowed, and the inner wrapping paper piece 31 responds to the force to bend the center axis. It can be deformed into a curved shape with a different radius of curvature.

In addition to the effect of the fourth invention of the present application, the fifth invention of the present application is such that the inner winding paper piece 21 and the outer winding paper piece 31 are
Since they are arranged so as to cover the gaps between the edges of each other, it is possible to make them strong against the force that tends to bend the central axis, and prevent them from being crushed during handling or use.

The sixth invention of the present application is, in addition to the effect of any one of the first to fifth inventions of the present application, a spiral slit 6
Thus, the paper tube can be unwound and easily wound around another member having a curved portion, and the slit 6 is formed in the same direction as the winding direction of the covering member 32 or the wound paper piece. After the winding, the elasticity of the covering member 32 and the wound paper piece is strongly exerted after the winding, and the original tube state can be naturally returned.

[Brief description of drawings]

FIG. 1 is an enlarged side view of a main part of a paper tube according to an embodiment of the present invention, with a part of the paper tube shown in section.

FIG. 2 is an explanatory diagram when forming an inner layer.

FIG. 3 is an explanatory diagram when forming an outer layer.

FIG. 4 is an explanatory cross-sectional view when the central axis of the paper tube is deformed into a curved shape.

FIG. 5 is a side view when the paper tube of the present invention is used in a curved portion of a leg of a chair.

6A to 6D relate to another embodiment of a paper tube, FIG. 6A is an explanatory view of an end face of a paper tube constituted only by an outer layer, and FIG. An explanatory view of an end face of a main part of a paper tube in which a medium-outer wound paper piece having a gap formed between a wound paper piece and an outer wound paper piece is illustrated, (C) shows an inner wound paper piece and an outer wound paper piece. FIG. 6 is an end face explanatory view of a main part of a paper tube in which a sheet-shaped medium-outer wound paper piece is arranged between the paper piece and (D) is a main part of the paper tube in which an inner layer is formed only by an inner covering member. It is an end face explanatory view.

FIG. 7 is a partial perspective view of an embodiment in which an opening is provided in a paper tube.

FIG. 8 is an enlarged side view of an essential part, which is a partial cross-section when a paper tube is compressed in the axial direction to form a wrinkle in a gap of a wound paper piece.

FIG. 9 is an explanatory diagram of a conventional example.

[Explanation of Codes] 1 Paper tube 2 Inner layer 3 Outer layer 6 Slit 21 Inner winding paper piece 22 Inner covering member 31 Outer winding paper piece 32 Outer covering member 24, 34 Gap

Claims (6)

[Claims] 1. A strip of paper (21) (3) having a predetermined width and having a long shape.
1) and a covering member (22) (32) for covering the wound paper pieces (21) (31) from the inside or the outside, and the wound paper pieces (21) (31) are sequentially arranged. By being wound, the gap (2a) (21a) (21a) (31a) (31a) between the widthwise edges (2a)
4) It has a cylindrical shape having (34), and the gaps (24) (34) allow the central axes of the cylindrically wound paper pieces (21) (31) to be deformed in a curved shape. The covering members (22) and (32) are made of a sheet-like material, so that the covering members (22) and (32) are deformed along the deformation of the central axes of the wound paper pieces (21) and (31). A paper tube characterized by being deformed together. 2. An inner layer (2) and an outer layer (3) arranged on the outer peripheral side of the inner layer (2) are provided, and at least one of the inner layer (2) and the outer layer (3) is
Equipped with a long width winding paper pieces (21) (31) of a predetermined width, the winding paper pieces (21) (31) are sequentially wound,
Width edge (21a) (21a) (31a) (31a) Gap (24) (3
4) having a cylindrical shape, and the gaps (24) (34) allow the central axes of the cylindrically wound paper pieces (21) (31) to be deformed into a curved shape. A paper tube characterized by being. 3. A rolled paper strip (21) having a predetermined width, wherein at least one of the inner layer (2) and the outer layer (3) has a long shape.
(31) and a sheet-like covering member (22) (32) for covering the rolled paper pieces (21) (31) from the inside or outside, and the covering member (22) (32) The covering members (22) and (32) are adhered to the wound paper pieces (21) and (31), so that the covering paper pieces (22) and (32) are wound.
The paper tube according to claim 2, wherein the paper tube is adapted to be deformed together with the deformation of the central axis of 1). 4. An inner layer (2), and an outer layer (3) arranged on the outer peripheral side of the inner layer (2), wherein the inner layer (2) has a long width and has a predetermined width. Piece (21)
And a sheet-shaped inner covering member (22) that covers the inner-wrapping paper piece (21) from the inside, and the inner-wrapping paper piece (21) is sequentially wound to form an inner-wrapping paper piece. The piece (21) is
a) It has a tubular shape with a gap (24) between (21a).
By 4), the central axis of the cylindrically wound inner winding paper piece (21) can be deformed into a curved shape, and the inner covering member (22) is bonded to the inner winding paper piece (21). As a result, the inner covering member (22) is deformed together with the deformation of the central axis of the inner-wrapping paper pieces (21) and (31), and the outer layer (3) is formed of an elongate outer member having a predetermined width. Rolled Paper Pieces (31)
And a sheet-shaped outer covering member (32) for covering the outer wound paper pieces (21) (31) from the outside, and the outer wound paper pieces (31) are sequentially wound so that Wrap the paper strip (31) between the widthwise edges (31a) (31a) (3
The outer cover member (32) has a cylindrical shape having 4), and the gap (34) allows the central axis of the cylindrically wound outer winding paper piece (31) to be deformed into a curved shape. However, the outer covering member (22) is deformed together with the deformation of the outer winding paper piece (31) by being adhered to the outer winding paper piece (31). A paper tube characterized in that the (21) and the outer-wrapping paper piece (31) are configured to be slidable in the axial direction with respect to each other. 5. The outer wound paper piece (31) is arranged so as to be passed between the edges (21a) (21a) of the inner wound paper piece (21) forming the gap (24). 5. The method according to claim 4, wherein
The described paper tube. 6. The slit according to claim 1, wherein the slit (6) cut from the outer circumference to the inner circumference is formed in a spiral shape along the axial direction. Paper tube.