JP2003170512A - Method for manufacturing flatwise paper pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method capable of easily manufacturing a flatwise paper pipe having high roundness in the cross-sectional shape of the inner surface thereof and having high strength against external force from a radial direction. <P>SOLUTION: A process for cutting off a part of at least one of the outside and inside surfaces 10c and 10d of the winding start end 10a of raw paper 10 to form taper surfaces 11, 13, 14a and 14b to the winding start end 10a is provided. The flatwise paper pipe is manufactured by forming the taper surfaces 11, 13, 14a and 14b to the winding start end 10a and subsequently winding the raw paper 10 into a cylindrical shape so as to form a plurality of layers. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a flat paper tube, and more particularly to a method for manufacturing a flat paper tube used as a core or the like when winding a strip-shaped material into a coil.

[0002]

2. Description of the Related Art A flat paper tube used as a core or the like when winding a strip-shaped material such as a steel plate, a copper foil, or an aluminum foil into a coil is used to wind one end of a base paper having a predetermined width dimension. After fixing to the take-up roll of the paper tube machine as the starting end, the base paper is wound multiple times in a cylindrical shape to be laminated in a plurality of layers, and the base papers constituting each layer are adhered to each other to form a tubular body. Manufactured by.

At this time, the winding is carried out a required number of times, and when the flat paper roll having the required wall thickness is obtained, the winding is finished, and the extra base paper is cut in the longitudinal direction of the paper pipe. The cut end is used as a winding end, the winding end is adhered to the outer surface of the paper tube, and the tubular body is removed from the winding roll to obtain a flat paper tube.

[0004]

However, the winding start end and winding end have the thickness of the base paper on the center side surface of the flat paper tube (inner surface of the tube) and the outer surface of the flat paper tube, respectively. A step is caused due to this. At this time, the level difference on the inner surface of the flat paper tube causes the center deviation of the center of the flat paper tube when the strip material is wound around the flat paper tube, and the center of rotation when the strip material is wound on the outer surface. There is a drawback in that vibration is generated due to the deviation of

Further, when a step is formed on the outer surface of the flat paper tube, a step is also created in the layer of the strip-shaped material wound on the outer surface. For example, when the strip-shaped material is a thin plate material such as a metal foil. However, there is a problem that the band-shaped material is deformed by the step.

The present invention solves the above-mentioned conventional problems, and provides a method for easily manufacturing a flat paper tube having a high strength against external force from the radial direction without causing a step due to the thickness of the base paper. Is intended.

[0007]

A method for manufacturing a flat paper tube according to the present invention comprises: (a) a step of winding a belt-shaped base paper into a plurality of layers in a cylindrical shape; and (b) bonding the wound base papers to each other. And a step of molding into a tubular body, and (c) a step of drying the tubular body,
At least one of the outer surface and the inner surface of the winding start end of the base paper is cut out at least before the step (b) to form a taper surface at the winding start end. .

The method for manufacturing a flat paper tube according to the present invention has a step of winding the base paper into a plurality of layers in a cylindrical shape from the winding start end. Therefore, the manufactured paper tube is composed of a plurality of layers of base paper and has high strength.

Further, before the step of winding the strip-shaped base paper into a cylindrical shape from the winding start end, there is a step of cutting and removing a part of the outer surface or inner surface of the winding start end or both of the outer surface and the inner surface. is doing. Therefore, a step due to the thickness of the base paper does not occur on the inner surface of the manufactured paper tube.

In the step (b), it is preferable that at least one of the outer surface and the inner surface of the winding end of the rolled base paper is cut off to form a taper surface at the winding end.

With this structure, no step is formed on the outer surface of the manufactured paper tube due to the thickness of the raw paper.

In this case, it is preferable that the taper surface at the winding start end and the taper surface at the winding end are provided at positions facing each other in the radial direction of the paper tube.

According to this structure, it is possible to obtain a flat paper tube having a uniform wall thickness and a small mass deviation.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an equipment diagram for explaining a manufacturing process and a manufacturing apparatus for a flat paper tube according to the present invention.

The apparatus shown in FIG. 1 is a flat paper tube 50 of the present invention.
It is a flat paper tube machine 1 used when manufacturing the. The flat paper winding machine 1 has a winding roll 2 for winding the strip-shaped base paper 10 and pressing rolls 3, 3 for pressing the base paper 10 wound around the winding roll 2.

FIG. 2 is a perspective view showing a state in which the winding start end 10a of the base paper 10 is fixed to the winding roll 2. In addition, in order to make the explanation easy to understand in FIG.
The press rolls 3 are omitted in the drawing.

FIG. 3 is a sectional view of the base paper 10 taken along the line I--I of FIG. 2 as seen from the direction C in the drawing.

FIG. 4 is a view showing a cross-sectional shape of a flat paper roll 50 obtained by the method for manufacturing a flat paper pipe according to the present invention, which is cut in the radial direction (Y direction shown in FIG. 1).

In the method for manufacturing the flat paper tube 50 of the present invention, a step of cutting and removing a part of the winding start end 10a of the base paper 10 is provided before the step of winding the base paper 10 around the winding roll 2. A taper surface 11 is formed at the winding start end 10a. FIG. 3 shows the winding start end 10
In a, the cutting edge region 10a1 provided on the outer surface 10c side of the base paper 10 is cut and removed.
The state where the tapered surface 11 is formed on a is shown.

Then, as shown in FIG. 2, the winding start end 10a on the inner surface 10d side of the raw paper 10 is fixed to the surface of the winding roll 2 by, for example, a tape or a belt.

Next, the winding roll 2 is attached to the arrow A shown in the figure.
The base paper 10 is wound around the winding roll 2 in a cylindrical shape with the inner surface 10d being in contact with the surface of the winding roll 2 by rotating in a direction. At this time,
The base paper 10 is fed in the direction of arrow B in the drawing as it is wound around the winding roll 2.

Next, after the stencil sheet 10 makes one round on the surface of the winding roll 2, as shown in FIG. 1, the outer surface 10 of the stencil sheet 10 wound on the winding roll 2 is rotated.
The inner surface 10d is overlaid on c and is wound continuously.

Here, an adhesive is applied in advance to the inner surface 10d or the outer surface 10c. Then, the inner surface 10d and the outer surface 10c
When being wound around the winding roll 2, the contact line 20 makes contact with the winding roll 2, so that the winding roll 2 is bonded by the adhesive. At this time, since the wound base paper 10 is pressed by the pressing rolls 3 in the direction toward the winding roll 2, the adhesive force between the inner surface 10d and the outer surface 10c increases. .

In this way, the base paper 10 is wound around the winding roll 2, and the base paper 10 is laminated in a plurality of layers in a cylindrical shape to form the tubular body 30, and a paper tube having a required wall thickness is obtained. When it becomes like this, winding is ended. Then, the extra base paper 10 is cut in the width direction (X direction in the drawing) along the cutting line 40. This cut end forms the winding end 10b. The winding end 10b is adhered to the outer surface 31 of the tubular body 30, the surface of the cutting end region 10e in the vicinity of the winding end 10b is cut and removed by a sander or the like to form the tapered surface 12, and then the tubular body is formed. The flat roll paper tube 50 is obtained by removing 30 from the winding roll 2 and drying the adhesive.

Therefore, the outer surface 50 of the flat paper tube 50 is
Since b has no step due to the thickness of the base paper 10 due to the formation of the tapered surface 12, there is no deformation of the strip-shaped material wound around the outer periphery due to the step.

Further, as shown in FIG. 4, the winding start end 1
When the taper surface 11 is formed on 0a and then the tape is wound, the inner surface 50a of the paper tube 50 has no step due to the thickness of the base paper 10. Therefore, when winding the strip-shaped material on the outer surface 50b, It is possible to manufacture the flat paper tube 50 that does not generate vibration due to the deviation of the center of rotation.

Therefore, the step of cutting and removing the step caused by the thickness of the base paper 10 generated on the inner surface 50a is not necessary, and therefore, when the step is cut and removed, the surface of the end region 10a is wide. The inner surface 50a is removed by cutting.
The roundness of the cross section does not decrease. Further, since it is not necessary for an operator to enter the inner surface 50a to perform a cutting operation in order to cut the step, the manufacturing process can be simplified. Further, the manufactured flat paper wrapping tube 50 has high strength because the base paper 10 is laminated in a plurality of layers.

In particular, as shown in FIG. 4, the inner surface 50a is
When the tapered surface 11 and the tapered surface 12 of the outer surface 50b are opposed to each other, the wall thickness of the entire flat paper tube 50 becomes uniform and the deviation of mass is eliminated.

Therefore, the inner surface 50 of the flat paper tube 50 is
When the expansion drum is placed in a and is fixed to the winding device for the band-shaped material, the center of the expansion drum can be easily aligned with the center of the flat paper tube 50. Therefore, when the flat paper roll tube 50 is rotated together with the expansion drum, the strip-shaped material can be wound without rattling.

FIG. 5 is a view showing a cut portion of the winding start end 10a in another example in the cutting and removing step of the present invention, and corresponds to FIG. In the example shown in FIG. 5, the cutting edge region 10a2 on the inner surface 10d side of the base paper 10 is formed.
Is removed by cutting, and the taper surface 13 is formed on the winding start end 10a.
Is formed.

In this way, the cutting end region 10a2 on the inner surface 10d side is removed by cutting and the tapered surface 13 is formed.
In the same manner as in the case of forming the tapered surface 11 by cutting away the cutting end region 10a1 on the outer surface 10c side, the thickness of the base paper 10 on the inner surface 50a of the paper tube 50 may be formed. Since a step caused by the above is not generated, when winding the strip-shaped material on the outer surface 50b,
Flat wrapping paper tube 50 that does not generate vibration due to the deviation of the center of rotation
Can be manufactured.

FIG. 6 is a view showing a cut portion of the winding start end 10a of the base paper 10 in still another example in the cutting and removing step of the present invention, and corresponds to FIG. In the example shown in FIG. 6, the cutting edge regions 10a1 and 1 on both the outer surface 10c side and the inner surface 10d side of the base paper 10 are provided.
0a2 is cut and removed, and tapered surfaces 14a and 14b are formed at the winding start end 10a.

In this way, both the cutting end regions 10a1 and 10a2 are cut and removed, and the tapered surface 14 is formed.
When a and 14b are formed, only the cutting edge region 10a1 on the outer surface 10c side or the inner surface 10d.
It is possible to easily reduce the thickness of the winding start end 10a of the base paper 10 as compared with a case where only the tapered end region 10a2 on the side is removed by cutting to form only the tapered surface 11 or only 13. Therefore, it is possible to further reduce the step difference on the inner surface 50a due to the thickness of the base paper 10.

In the above embodiment, the winding end 10b is
Is bonded to the outer surface 31 of the tubular body 30, and the winding end 1
The surface of the cutting end region 10e near 0b is cut and removed by a sander or the like to form the tapered surface 12, but the present invention is not limited to this, and FIG. Winding end 10b by the method described in B).
Can also be formed.

FIG. 7A shows another method of forming the winding end 10b. In the method shown in FIG. 7 (A),
After the feeding of the base paper 10 in the direction B in the drawing is finished and the winding is finished, a cutting roll 60 installed on the upper surface of the base paper 10 is used instead of the step of cutting the base paper 10 at the cutting line 40. While rotating in the direction of arrow C in the drawing, the cutting roll 60 is lowered toward the outer surface 10c of the base paper 10 (in the direction of arrow D in the drawing), and the base paper 10 is moved.
The cutting area 10f is cut.

The cutting area 10f is covered with the cutting roll 60.
When cut with, as shown in FIG.
Is separated into a front portion 10A and a rear portion 10B. End regions 10Aa and 10Ba of the front portions 10A and 10B
At this point, arcuate tapered portions 14 and 15 similar to the outer shape of the cutting roll 60 are formed.

The end region 10Aa can be used as the winding end 10b, and the end region 10 can be formed.
Ba can be used as the winding start end 10a.

Thus, after the winding of the base paper 10 is completed, the base paper 10 is cut by the cutting roll 60 to form the end regions 10Aa and 10Ba, and the base paper 10 is cut and the winding end 10b is formed. It is possible to simultaneously form the tapered portion 14 of the
Since the winding start end 10a on which 5 is formed can also be formed at the same time, the work efficiency can be improved.

In FIG. 7A, the cutting roll 60 is
However, in the present invention, the cutting roll 60 may be installed on the lower side of the base paper 10.

[0040]

As described above, according to the present invention, it is possible to easily manufacture a flat paper tube having a large strength without causing a step due to the thickness of the base paper.

[Brief description of drawings]

FIG. 1 is a perspective view showing a manufacturing process of a flat paper roll tube,

FIG. 2 is a perspective view showing a state in which an end region of the base paper is fixed to a winding roll,

FIG. 3 is a cross-sectional view showing a tapered surface of a base paper according to an embodiment of the present invention,

FIG. 4 is a cross-sectional view obtained by cutting a flat paper tube in a radial direction,

FIG. 5 is a cross-sectional view showing another example of the tapered surface of the base paper according to the embodiment of the present invention,

FIG. 6 is a sectional view showing still another example of the tapered surface of the base paper according to the embodiment of the present invention,

FIG. 7A is a diagram showing a method of forming a winding start end and a winding end, and FIG. 7B is a diagram showing a state in which a winding start end and a winding end are formed;

[Explanation of symbols]

1 Flat paper tube machine 2 wrapping roll 3 Presser roll 10 Base paper 10a winding start 10b winding end 11, 12, 13, 14a, 14b Tapered surface 20 contact lines 30 tubular body 40 cutting line 50 flat paper roll

Claims (3)

[Claims] 1. A step of: (a) winding a belt-shaped base paper into a plurality of layers in a cylindrical shape; (b) adhering the wound base papers together to form a tubular body; (c) the tubular shape. And a step of drying the body, wherein at least one of an outer surface and an inner surface of the winding start end of the raw paper is cut off to cut the winding start end before at least the step (b). A method for manufacturing a flat paper tube, comprising the step of forming a tapered surface on the inner surface. 2. The flat surface according to claim 1, wherein in the step (b), at least one of the outer surface and the inner surface of the winding end of the wound base paper is cut off to form a taper surface at the winding end. Method for manufacturing a paper tube. 3. The method for manufacturing a flat paper tube according to claim 1, wherein the taper surface at the winding start end and the taper surface at the winding end are provided at positions facing each other in the radial direction of the paper tube.