JP2002001842A - Spiral paper tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spiral paper tube shortening the time for an operation of winding a paper tape, having a strong rigidity against a ring crush and enabling reduction of the cost. SOLUTION: The spiral paper tube has a structure formed by a method wherein the paper tape 2 having cross-direction fibers 4 at a right angle or an obtuse angle θ1 to the longitudinal direction is wound and bonded in a plurality of layers spirally at a gentle angle θ2 of inclination to the center line 0 of a mandrel so that the cross-direction fibers 4 of the paper tape 2 have an angle of inclination opposite to the angle θ2 of inclination of the wind of the paper tape 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spiral paper tube having strength and rigidity for preventing ring crush, improving manufacturing efficiency and reducing costs.

[0002]

2. Description of the Related Art Conventionally, spiral paper tubes have been used as cores for facsimile heat-sensitive recording paper, wrap films for food packaging, aluminum foil, agricultural vinyl sheets, and the like.
In the production of long paper in a paper mill, the fiber direction of the paper is made by so-called longitudinal fibers along the longitudinal direction and is always longitudinal fibers. Therefore, as shown in FIG. 7, this spiral paper tube has a plurality of paper tapes 20 of longitudinal fibers 40 in the same direction as the longitudinal direction of the paper tape 20 and a plurality of paper tapes spirally formed at a steep inclination angle θ3 with respect to the center line 0 of the mandrel. As shown in FIG. 8, a spiral paper tube 10a formed by layer-winding adhesion and a paper tape 20 of a longitudinal fiber 40 in the same direction as the longitudinal direction of the paper tape 20 are loosened with respect to the center line 0 of the mandrel. Tilt angle θ
The spiral paper tube 10b formed by spirally winding and bonding a plurality of layers at 4 is common.

[0003]

In the spiral paper tube 10a shown in FIG. 7, a plurality of layers of paper tape 20 are spirally wound and adhered at a steep inclination angle θ3 with respect to the center line 0 of the mandrel. Even if the fibers are the longitudinal fibers 40 in the same direction as the longitudinal direction of the paper tape 20, the longitudinal fibers 40 have a steep inclination angle with respect to the axial direction of the spiral paper tube 10a, and thus are added in the radial direction of the spiral paper tube 10a. It receives external force in the line direction of the fibers of the longitudinal fibers 40 and resists it, and has strong rigidity against collapsing deformation called ring crush. However, since the spiral winding pitch P1 is small, spiral paper per required length is used. The number of times the paper tape 20 is wound around the tube 10a is increased, and the time required for winding the paper tape 20 is increased, and the paper tape 20 needs to be long, resulting in an increase in cost.

On the other hand, a spiral paper tube 10 shown in FIG.
b, since the paper tape 20 is spirally wound with a plurality of layers at a gentle inclination angle θ4 with respect to the center line 0 of the mandrel, and the spiral winding pitch P2 is large, the spiral paper tube 10b per required length is formed. Since the number of windings of the paper tape 20 is small, the time required for winding the paper tape 20 is short, and the length of the paper tape 20 can be reduced, so that the cost is reduced. Since the inclination angle is gentle with respect to the axial direction of the tube 10b, the external force applied in the radial direction of the spiral paper tube 10a is received in the shearing direction of the longitudinal fibers 40, so that the resistance to the external force is small and the crush deformation called ring crush easily occurs. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a spiral paper tube in which the time required for winding a paper tape is reduced, the rigidity against ring crush is high, and the cost can be reduced.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for forming a plurality of layers of paper tape having a weft fiber perpendicular or obtuse to the longitudinal direction in a spiral manner at a gentle inclination angle with respect to the center line of the mandrel. The paper tape is wound and adhered, and the horizontal fibers of the paper tape have an inclination angle in a direction opposite to the winding inclination angle of the paper tape.

[0007] The present invention also provides a paper tape having a weft fiber perpendicular or obtuse angle to the longitudinal direction and a paper tape having a warp fiber parallel to the longitudinal direction in a helical manner at a gentle inclination angle with respect to the center line of the mandrel. A plurality of alternating layers are wound and adhered to form a composite wound layer of the horizontal fiber layers and the vertical fibers of the paper tape.

Further, the present invention provides a helical spiral formed at a gentle inclination angle with respect to the center line of a mandrel by using a paper tape having a weft fiber perpendicular or obtuse to the longitudinal direction and a paper tape having a warp fiber parallel to the longitudinal direction. And a plurality of layers are alternately wound and wound at an alternate pitch to form an alternate pitch composite wound layer of the horizontal fiber layers and the vertical fibers of the paper tape in the axial direction.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

First Embodiment As shown in FIGS. 1 and 2, in the first embodiment of the present invention, a paper tape 2 of a spiral paper tube 1 has a crossed fiber 4 at a right angle or an obtuse angle θ1 with respect to the longitudinal direction. . That is, the side fibers 4 of the paper tape 2 are
Is a right angle or an obtuse angle θ1 with respect to the side edge 3 in the longitudinal direction. This paper tape 2 is, for example, 30 ° with respect to the center line of the mandrel.
A plurality of layers are spirally wound and adhered at a gentle spiral angle θ2 at a large spiral winding pitch P, and the cross-fibers 4 of the paper tape 2 have an inclination angle in the opposite direction to the winding inclination angle of the paper tape 2. It is the structure which did.

[0010]

Second Embodiment The first embodiment is a spiral paper tube 1 in which all layers are wound and adhered by a paper tape 2 having a weft fiber 4 having a right angle or an obtuse angle θ1 with respect to the longitudinal direction. As shown in FIG.
Conventional paper tape 20 of longitudinal fibers 40 in the same direction as the longitudinal direction
And a paper tape 2 having a weft fiber 4 at a right or obtuse angle .theta.1 to the longitudinal direction, as in the first embodiment, a gentle inclination angle .theta.2 of about 30 DEG with respect to the center line 0 of the mandrel.
And a plurality of layers are spirally and alternately spirally wound at a large spiral winding pitch P, and the layer 5a of the horizontal fiber 4 and the vertical fiber 40 are bonded.
And a layer 5b.

[0011]

Third Embodiment As shown in FIG. 4, a spiral paper tube 1 according to a third embodiment of the present invention comprises a paper tape 2 having a weft fiber 4 at a right angle or an obtuse angle .theta.1 to a longitudinal direction and a warp fiber in a direction parallel to the longitudinal direction. 40 with the conventional paper tape 20 having
Slow inclination angle θ with respect to the center line of the mandrel as in the embodiment.
2, a plurality of layers are spirally wound at an alternate pitch spirally at a large spiral winding pitch P, and the paper tape 2 is wound in the axial direction.
Is a composite wound layer having an alternate pitch of a layer of the horizontal fibers 4 and a layer of the vertical fibers 40 of the paper tape 20.

The paper tape 2 having the weft fibers 4 at a right angle or an obtuse angle θ1 with respect to the longitudinal direction in the first to third embodiments is obtained as follows. In the manufacture of long paper, the paper fibers are always made of longitudinal fibers along the longitudinal direction, so that all the long papers are longitudinal fibers, and therefore, the conventional spiral paper tube paper tape 20 has a longitudinal direction. The parallel longitudinal fibers 40 are used. Therefore, as shown in FIG. 5, the paper tape of the warp fibers is cut in a direction perpendicular to the warp fibers at a required length in the longitudinal direction to obtain a large number of square paperboards. The longitudinal fibers are arranged side by side in the longitudinal direction,
A paper tape 2 which is a material of the spiral paper tube 1 is formed by staggering the rectangular paperboard 6a on the front side and the rectangular paperboard 6b on the reverse side so that seams 7a and 7b are alternately positioned, and winding the coil.
a.

The paper tape 2a includes front and back paperboards 6a and 6b.
Are paper fibers 4 in the same direction, and the paperboards 6a and 6b on the front and back are directly laminated and stuck together and staggered in a tape shape and connected, as shown in FIG. A spiral paper tube 1 is formed by connecting the lead paper 8 of the longitudinal fibers 40 between the front and back paperboards 6a and 6b in a tape shape using the bonded lead paper 8 as a connection medium and winding the coil.
The paper tape 2b is used as the material.

According to the spiral paper tube 1 of the first aspect of the present invention, the paper tape 2 is made of a cross-fiber 4 whose fiber is perpendicular or obtuse angle θ1 to the longitudinal side edge 3 and has a gentle inclination with respect to the center line 0 of the mandrel. Since the angle of inclination is opposite to the angle of winding of the paper tape 2 wound at the angle θ2, the side-grain fibers 4 receive the external force applied in the radial direction of the spiral paper tube 1 in the axial direction of the fibers and resist. It has strong rigidity against crushing deformation called ring crush with a small number of wound layers. The resistance of the external force due to the cross-fibers 4 is such that as the gentle inclination angle θ2 with respect to the center line of the spiral paper tube 1 approaches the center line 0, the angle of the cross-fibers 4 is oriented in the radial direction of the spiral paper tube 1. The power will increase,
The rigidity of the spiral paper tube 1 is further improved.

Spiral paper tube 1 according to claims 2 and 3
According to the present invention, the cross-fibers 4 and the paper tape 20 by the paper tape 2 are used.
The composite wound layer or the alternate pitch composite wound layer with the longitudinal fiber 40 of the above-mentioned structure, the lateral fiber 4 resists the external force applied in the radial direction of the spiral paper tube 1, and the longitudinal fiber 40 of the spiral paper tube 1 It resists the external force applied in the axial direction and exerts a synergistic effect between the horizontal fiber 4 and the vertical fiber 40,
The spiral paper tube 1 having a high rigidity can be provided.

Further, since the paper tape 2 or the paper tape 2 and the paper tape 20 of the first to third aspects are spirally wound at a gentle inclination angle θ2 with respect to the center line 0 of the mandrel, a large spiral winding pitch P is obtained. In addition, the number of windings of the paper tape 2 of the spiral paper tube 1 per required length is small, and the time required for winding the paper tape 20 is short, and the cost can be reduced because the corner paper tape 2 or the paper tape 20 can be obtained with a short length. it can.

Further, since the spiral paper tube is manufactured using glue containing a large amount of water, it is highly likely that the spiral paper tube shrinks in the radial direction due to drying after the manufacture. According to this, since the radially oriented fiber 4 resists the contraction force in the radial direction, the contraction in the radial direction is prevented.

A paper tape for manufacturing a spiral paper tube is wound around a mandrel by a coil wound around a diameter of about 1 m at a paper mill or the like by a spiral paper tube manufacturing apparatus. The thickness of this paper tape is limited to 1 mm. This is because, in the conventional paper tape, as described above, the fiber direction of the paper is a longitudinal fiber along the longitudinal direction in the production of long papermaking. When winding the paper tape of this warp fiber in a coil shape, it is wound against the repulsive force of the warp fiber against bending, and the paper tape with a paper thickness of 1 mm or more cannot be coil wound, and the winding on the mandrel also It was difficult. Therefore, a winding layer thickness of 5 mm is obtained using a 1 mm thick paper tape of longitudinal fiber.
In order to manufacture the spiral paper tube of No. 5, five layers were formed by winding five times.

In the paper tape 2 of the weft fiber of the spiral paper tube 1 according to the present invention, the paper tape 2 is bent in parallel with the weft fiber 4, so that the paper tape 2 can be bent smoothly without generating a repulsive force against bending. Even a thick paper tape can be wound in a coil shape, and can be easily wound around a mandrel. Therefore, when manufacturing a spiral paper tube having a wound layer thickness of 5 mm, 3
The layer strength can be reduced, the number of spiral winding steps can be reduced, the winding time of the paper tape 2 can be shortened, the efficiency of manufacturing the spiral paper tube can be improved, and the cost can be reduced.

In the case of the staggered paper tape 2a shown in FIG. 5 used for the spiral paper tube 1 of the present invention,
By using a paper thickness of 0.75 mm for each of a and 6b, a 1.5 mm paper tape having a maximum paper thickness that can be easily obtained is obtained. Further, in the case of the paper tape 2b using the lead paper 8 shown in FIG.
using a lead paper 8 of ultra-thin warp fibers 40 of 0.74 m
By using the front and back paperboards 6a and 6b having a paper thickness of 1 mm, a 1.5 mm paper tape having a maximum paper thickness that can be easily bent can be obtained. Although the lead paper 8 is the warp fiber 40, it has a very thin paper thickness, so that the repulsive force against bending of the warp fiber 40 is very small and has almost no influence on the bending.

The spiral paper tube 1 of the present invention having high strength and rigidity as described above can be used for a core of facsimile thermosensitive recording paper, wrap film for food packaging, aluminum foil, vinyl sheet for agricultural use, etc. And sufficiently fulfills the role of a winding core without collapse.

The spiral paper tube 1 of the present invention can be used not only as the core, but also as a building material because of its high strength and rigidity. For example, by using a steel pipe of a spacer called a void interposed between opposed forms when constructing a concrete wall in place of the spiral paper pipe 1 of the present invention, it is lightweight, easy to handle, and cost is reduced. It is planned. It can also be used as a guide pipe for electric wiring.

[0023]

As described above, according to the present invention, a spiral paper tube spirally wound at a gentle inclination angle with a paper tape of cross-fiber fibers, which has not been used conventionally, has high rigidity and prevents ring crash. However, it is possible to provide a low-cost spiral paper tube having a wide range of uses such as not only a core but also a building material, since there is no radial shrinkage, winding during manufacturing is easy, and winding time is shortened. There are advantages that can be done.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a spiral paper tube according to the present invention.

FIG. 2 is an end view taken in the direction of arrow A in FIG. 1;

FIG. 3 is a side view showing a second embodiment of the spiral paper tube according to the present invention.

FIG. 4 is a side view showing a third embodiment of the spiral paper tube according to the present invention.

FIG. 5 is a perspective view showing a paper tape of a spiral paper tube according to the present invention.

FIG. 6 is a perspective view showing another example of the paper tape of the spiral paper tube according to the present invention.

FIG. 7 is a side view of a conventional spiral paper tube.

FIG. 8 is a side view of a conventional spiral paper tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spiral paper tube 2 Paper tape of horizontal fiber 3 Side edge 4 Horizontal fiber 5a Horizontal fiber layer 5b Vertical fiber layer 20 Paper tape of vertical fiber 40 Vertical fiber

Claims (3)

[Claims] 1. A paper tape having a weft fiber having a right angle or an obtuse angle with respect to a longitudinal direction is spirally wound in plural layers at a gentle inclination angle with respect to the center line of a mandrel, and the weft fiber of the paper tape is wound on the paper tape. A spiral paper tube characterized in that the inclination angle is opposite to the inclination angle. 2. A paper tape having a weft fiber perpendicular or obtuse angle to the longitudinal direction and a paper tape having a weave fiber parallel to the longitudinal direction are spirally alternately layered at a gentle inclination angle with respect to the center line of the mandrel. A spiral paper tube wherein a plurality of layers are wound and adhered to form a composite wound layer of a horizontal fiber layer and a vertical fiber of the paper tape. 3. A helical alternating pitch at a gentle inclination angle with respect to the center line of the mandrel by a paper tape having weft fibers perpendicular or obtuse to the longitudinal direction and a paper tape having longitudinal fibers parallel to the longitudinal direction. A spiral paper tube, wherein a plurality of layers are wound and adhered to each other to form an alternate pitch composite wound layer of a horizontal fiber layer and a vertical fiber of the paper tape in the axial direction.