JP2004043187A - Paper tube - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily decomposed paper tube, manufactured without a special manufacturing process. <P>SOLUTION: Banded paper 4 is spirally wound without overlapping the edge parts 6 to stack a plurality of cylindrical layers to form the paper tube. The respective cylindrical layers 2, 3 are stacked so that the position of the edge part 6 does not conform to the position of the edge part 6 of the banded paper 4 of another layer. An adhesive 7 is partially applied to the interlayer between the cylindrical layers 2, 3 to be easily separated from each other. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention can be used as a sleeve for forming a through hole for passing a water pipe, an electric wire, or the like in a concrete structure, for example, a concrete beam, or as a sleeve for forming a sign or a guardrail on a road, or a roll paper. And a paper tube used as a storage core for wraps.

紙 As a sleeve for forming a through hole in a concrete structure, a paper sleeve has recently been used because of its ease of disposal. A typical example of the paper sleeve is a void tube. The void tube is a paper tube manufactured by spirally winding a band of paper into a plurality of layers to produce a cylindrical shape. FIG. 1 shows a conventional void tube 1 'in which two strips of paper are laminated in two layers. The void tube 1 'is composed of a tubular layer 2' and a tubular layer 3 'each made of a band-shaped paper in which the edge portions 6' are overlapped and spirally wound, and the overlapping edge portion 6 'and an interlayer between the tubular layers. Are bonded by an adhesive 7 ′ applied to the entire inner surface of the cylindrical layer 3 ′. Further, although not shown, a water-resistant sheet that is easily detached from concrete is affixed to the outer surface (outermost surface of the void tube) of the cylindrical layer 3 '.

As described above, in the conventional void tube, the overlapping edge portions 6 'and the layers between the cylinder layers are firmly fixed by the adhesive 7' applied to the entire inner surface of the band-shaped paper, and it is as if an integrally formed cylinder. It is formed with an appropriate strength.

However, the void tube used as such a sleeve is durable enough to withstand the concrete pressure (more than necessary), but it is not easy to deform it, making it difficult to separate from the concrete. ing.

(2) As one of means for separating the void pipe from the concrete, there is a dedicated void pipe remover 9 as shown in FIG. First, the void pipe remover 9 is driven and inserted between the concrete and the void pipe 1 'by a hammer or human power (FIG. 2A). Next, the handle 10 is turned to reduce the diameter of the void pipe, thereby separating the void pipe 1 'from concrete (FIG. 2B). However, even if such a dedicated void pipe remover 9 is used, it is necessary to endeavor to work by human labor, and when the void pipe is installed in a high place where it cannot be reached, it is unstable. It will be a heavy work on a good scaffold and will be dangerous.

On the other hand, as a void tube that is easily detached, for example, there is a void tube that has been subjected to suturing along the circumferential direction as shown in Patent Document 1. However, in this case, since the suturing process is indispensable, the number of manufacturing steps of the void tube itself increases and the cost increases.
JP-A-10-311141

In addition to the above-described void tube paper tube, examples of the use of a similar paper tube include a core material of a roll paper of a facsimile machine or a printer, a core material of a food wrap, and a core material of a cloth. . These core paper tubes are also formed more rigidly than necessary to withstand the winding pressure, and should not be too hard at the time of disposal, such as injuring the ankle by stepping on the paper tube with your feet when discarding. Defects are seen.

As mentioned above, conventional paper tubes focus only on increasing the strength so as not to be crushed, and few have considered the ease of detaching from concrete or disassembling at the time of disposal. Further, in the case where the detachability from concrete is taken into consideration, a special process must be applied to the paper tube itself, so that a manufacturing process must be added, which results in an increase in the cost of manufacturing the paper tube. The present invention solves this problem, and proposes a paper tube that can be easily disassembled (separated), and does not require a special manufacturing process and can reduce the cost.

The present invention to solve such problems, in a paper tube formed by laminating a plurality of tubular layers formed by spirally winding a belt-shaped paper, by adjusting the adhesive to bond the layers between the tubular layers, It is characterized in that the adhesion between the cylinder layers is reduced. In order to weaken the adhesion between the cylinder layers, an adhesive for bonding the layers between the cylinder layers is partially applied, or an adhesive having a weakened adhesive force is used as the adhesive for bonding the layers between the cylinder layers. Such a structure is possible. Alternatively, the present invention is characterized in that, in a paper tube formed by stacking a plurality of tubular layers formed by spirally winding a belt-shaped paper, the layers between the tubular layers are not bonded to each other.

More specifically, the paper tube of the present invention is formed by laminating a plurality of cylindrical layers formed by spirally winding one band-shaped paper so that the edge portions thereof overlap with each other. While fixing with an adhesive so as not to lose the shape, between the cylinder layers, an adhesive is partially applied so as to be easily peeled, or adhered with an adhesive whose adhesive force is adjusted so as to be easily peeled, or Characterized in that they are not bonded.

According to the paper tube of the present invention, the adhesion between the cylinder layers is weakened by the partial application of the adhesive or the adjustment of the adhesion, or by the non-adhesion, so that the adhesion becomes easy. It doesn't require much force to peel off. Therefore, each cylinder layer can be easily disassembled by sequentially peeling it from the inside or the outside. On the other hand, by stacking a plurality of cylindrical layers, sufficient strength for use can be obtained.

In addition, since the paper tube of the present invention is devised to reduce the adhesive force between the cylinder layers by adjusting the adhesive, there is no need to add a special manufacturing process, and there is no factor leading to an increase in cost. Further, when the cylindrical layers are not bonded, the amount of adhesive used can be reduced, and the manufacturing cost of the paper tube can be reduced. On the other hand, in the case where an adhesive is partially applied between layers of the cylindrical layers so as to be easily peeled or an adhesive whose adhesive strength is adjusted is used, a disassembling operation of the paper tube is compared with a case where the cylindrical layers are not bonded to each other. In addition, the strength of the paper tube is improved by obtaining a certain amount of fixing force between the layers, while improving the strength of the paper tube.

帯 The band-shaped paper used for the paper tube may be formed as a single band-shaped paper by reducing the thickness of the edge portion by shifting and overlapping the same-shaped paper. In this way, a step can be formed in the edge portion, so that it is easy to peel off one edge portion from the other overlapping edge portion, and the thickness of the layer can be made uniform. Further, since the same shape of paper is laminated, the band-shaped paper becomes thicker and the strength of the paper sleeve is increased.

In the case of a paper tube where the above-mentioned edge portions overlap, due to its structure, when one end of the cylindrical layer (the one where the edge portion overlaps above) is pulled, it will be disassembled in a state where the spiral diameter expands When used as a void tube, a situation may occur in which peeling becomes difficult. Therefore, the present invention further proposes a paper tube capable of reducing the spiral diameter from any end and separating each cylindrical layer. That is, a plurality of tubular layers are formed by spirally winding one strip of paper so that the edges do not overlap, and each of the tubular layers is positioned at the edge of the strip of paper in another layer. It is laminated so that it does not match the position of the part, and between the layers of the cylinder layer, an adhesive is partially applied so that it is easy to peel off, or adhered with an adhesive whose adhesive force is adjusted so that it is easy to peel off A paper tube is provided.

According to this, the spirally wound strip of paper is in a state where the edges are not overlapping and the sides are facing each other, so it is possible to reduce the spiral diameter from either end of the paper tube and disassemble it It becomes. As a state in which the side faces face each other, a method of abutting them (abutting the sides) or leaving a gap without abutting can be adopted. According to the method of providing a gap, a spiral line formed by the gap clearly appears visually and can be clearly seen, so that the starting position when each cylinder layer is peeled is clearly indicated, thereby increasing work efficiency.

Also, in the paper tube of this embodiment, when bonding the layers between the cylinder layers, care should be taken not to match the positions of the edge portions of the cylinder layers. That is, in the paper tube of the present embodiment, since there is no edge portion fixed with the adhesive, if the positions of the edge portions of the respective cylinder layers are matched, the cylinder will lose its shape. As long as the cylinder does not lose its shape, the edge portion may be located anywhere. However, it is preferable to alternately locate the center line of the band-shaped paper forming the cylinder layer because the strength increases.

帯 It is preferable that the band-shaped paper used in the paper tube of this aspect is formed by laminating papers of the same shape to form one band-shaped paper. When papers of the same shape are superposed one on another, the thickness of the strip-shaped paper itself increases and the strength increases, so that a harder paper tube can be provided.

As a method of applying the adhesive partially between the cylinder layers, a method of applying the adhesive along one end or both ends (longitudinal side ends) of the belt-shaped paper, a method of applying the adhesive along the center line, a lattice pattern, a polka dot pattern, Various methods such as a method of applying with a shading pattern or a combination thereof can be adopted. In this case, since the bonding surface between the layers is reduced, the fixing force is weakened, and each cylinder layer can be peeled off smoothly. Further, since the amount of the adhesive used can be reduced, the production cost of the paper tube can be reduced.

In the paper tube of the present invention as described above, the angle at which the belt-shaped paper is spirally wound can be changed depending on each cylindrical layer. With this configuration, the direction in which the paper tube collapses due to concrete pressure or the like can be dispersed by various spiral angles, so that the paper tube does not collapse along the same spiral angle and the strength is improved. Furthermore, the winding direction of the band-shaped paper may be different for each layer, and in this case also, the strength of the paper tube is improved. For example, the direction in which the paper tube collapses due to concrete pressure or the like becomes more scattered and stronger when the tube layers are wound in the opposite direction than when they are all wound right. Examples of the winding method include a method in which each layer is alternately wound in the opposite direction, a method in which the winding direction is changed every two layers, and a method in which only the innermost layer is wound in the opposite direction.

According to the present invention, there is provided an unprecedented concept of a paper tube in which each tubular layer of the paper tube is peeled and decomposed. According to this paper tube, the tube layer can be easily separated and disassembled simply by pulling the tube layer, so there is no need to use a special tool to perform dangerous work such as detaching from concrete by force. Work at high places can be done safely. In addition, since the amount of adhesive used for bonding between the cylinder layers can be reduced, the paper tube can be manufactured at low cost. Further, the present invention can be realized by changing the kind of the adhesive, the portion to which the adhesive is applied, or the winding method of each cylindrical layer, so that the number of manufacturing steps for performing another processing for giving the separating property to the paper tube is increased. There is no need to provide a paper tube that can be easily disassembled while utilizing existing facilities.

FIG. 3 is a sectional view of a paper tube having a two-layer structure according to the present invention. This paper tube 1 is composed of a tubular layer 2 and a tubular layer 3, and each tubular layer 2 and 3 is made of a band-shaped paper 4 in which two sheets of the same shape are stacked and bonded together with an adhesive in order to increase the strength. Has become. This adhesive has a strong adhesive force so that the superposed paper of the same shape does not peel off. Although FIG. 3 shows a two-layer structure of the tubular layer 2 and the tubular layer 3, the number of tubular layers can be further increased according to the place where the paper tube 1 is used. Although not shown, a water-resistant sheet, such as kraft paper or a resin sheet (polylaminate, etc.), which is easily detached from concrete, is attached to the outer surface of the tubular layer 3.

The tubular layer 2 is formed by spirally winding the belt-shaped paper 4, and its side edges 5, 5 (side end faces) are detachable from either end (open end) of the tubular layer 2. In order to easily indicate the start position when the tubular layer 2 is peeled off, the roll is wound with a gap of 1 mm to 2 mm. In this way, the end of the band-shaped paper 4 can be confirmed at a glance, and, for example, the paper tube 1 is constructed at a high place where the user cannot reach the inside of the paper tube 1 and can reach it. In this case, the gap between the side edges 5 and 5 can be sensed by the feel of a finger, and the tubular layer 2 can be peeled off by hooking a nail in the gap. The gap is adjusted so as not to lower the strength of the paper tube 1. In addition to this example, when the sides 5 and 5 are brought into contact without leaving a gap, the edge portion 6 of the band-shaped paper 4 is colored and peeled so that the end of the band-shaped paper 4 can be checked at a glance. You can also indicate the starting position when you do. This coloring can be performed by, for example, shaving the middle of a roller for applying the adhesive. In this way, existing equipment can be utilized, and a paper sleeve can be provided at low cost without the need for additional equipment.

The cylinder layer 3 is also formed in the same form as the cylinder layer 2. Then, the surface (inner surface) of the belt-shaped paper 4 constituting the cylindrical layer 3 facing the cylindrical layer 2 is coated with an adhesive 7 with a width of about 1 cm to several centimeters on the edge portions 6 at both ends in the longitudinal direction. ing. By bonding the edge portion 6 to which the adhesive 7 has been applied to the tubular layer 2, the tubular layer 3 is fixed and the tubular layer 2 can maintain a tubular shape. The adhesive 7 may be partially applied to the inner surface along not only the edge portions 6 on both sides but also the edge portion 6 on one side, a center line, a lattice pattern, a polka dot pattern, a hatched pattern, a combination thereof, or the like. . Also, the adhesive 7 can be applied to the entire inner surface. In this case, the adhesive force is weakly adjusted by applying thinly, or the adhesive force is weakly adjusted by adjusting the components of the adhesive (such as concentration adjustment). For example, an adhesive 7 whose adhesive strength is weakened is used.

側 The sides 5, 5 of the cylinder layer 3 face each other along the center line of the band-shaped paper 4 constituting the cylinder layer 2. The position where the side edges 5 and 5 face each other can be slightly shifted from the center line of the band-shaped paper 4 or can be positioned at an angle different from the angle at which the band-shaped paper 4 of the tubular layer 2 is wound. That is, any position may be used as long as the cylindrical layer 2 does not lose its shape.

The cylinder layers 2 and 3 are both made of a two-layered band-shaped paper 4. For example, the cylinder layer 2 has a two-layer structure of 1 mm and 0.5 mm paper. In the case of a two-layer structure of 5 mm and 0.5 mm paper, in the belt-shaped paper 4 of the cylinder layer 2, the inner side is bonded to 1 mm paper and the outer side to 0.5 mm paper. It is preferable to adopt a structure in which 0.5 mm paper is bonded. That is, when the band-shaped paper 4 is formed by bonding papers having different thicknesses, the thin paper is bonded between the cylinder layers. Experiments have confirmed that this structure makes it easier to peel off the cylindrical layer.

As shown in FIG. 4, when the band paper 4 is spirally wound, the winding angle θ of the band paper 4 with respect to the central axis X of the paper tube 1 is such that the smaller the angle, the more the band paper 4 lies. This facilitates disassembly, but the strength is weakened because the number of the band-shaped papers 4 entering the fixed length D in the longitudinal direction is reduced. Conversely, when the winding angle θ is increased, the band paper 4 is in a standing state, so that the number of the band papers 4 in the length D increases and the strength increases, but it becomes difficult to disassemble this time. As a result of experimentation, an optimum value satisfying these characteristics was obtained. As a result, the range of θ = 22 ° to 28 ° was the best. Even if the diameter of the paper tube 1 is different, the angle θ can be maintained in an optimum range by adjusting the width of the belt-shaped paper 4.

5 (a) and 5 (b) show how the paper tube 1 of the above example is disassembled when used as a sleeve for forming a concrete through hole. In order to separate the paper tube 1, the paper tube 1 is sequentially separated inward from the cylindrical layer 2. That is, first, a driver or a nail is hooked into a gap between the side edges 5 and 5 appearing on the inner surface of the end of the tubular layer 2 which is open, and the end of the tubular layer 2 is peeled off from the tubular layer 3. make. Next, the pulling piece 8 is pulled out in the direction of the arrow. Then, while the spiral diameter of the cylindrical layer 2 is reduced, the spiral layer is separated from the layer with the cylindrical layer 3 and decomposed. Similarly, the paper tube 1 is separated from the concrete by separating the tube layer 3 from the concrete. Since the kraft paper or the like is stuck on the outer surface of the tubular layer 3 as described above, the detachability from concrete is also good.

分解 In this disassembling operation, it is possible to use a conventional void pipe remover 9. That is, after forming the pulling piece 8 as described above, the pulling piece 8 is sandwiched between the holding pieces of the void pipe remover 9, and the cylindrical layer 2 (3) is wound around the void pipe remover 9 while turning the handle 10. You can take it.

紙 In addition, when the paper tube 1 used as a paper sleeve for concrete construction is formed into a double-tube elastic sleeve type as disclosed in Japanese Patent Application Laid-Open No. 5-195620, the strength is increased because it is preferable. Further, in the present embodiment, application to a paper sleeve forming a through hole in a concrete structure has been described.However, when installing a sign or a guardrail on a road, it is necessary to form a hole for embedding a support or a pole thereof. Can be applied as a paper sleeve. Furthermore, if the paper tube 1 is used as a core material such as roll paper or wrap, the paper tube 1 can be disassembled from the inner tube layer 2 and the outer tube layer 3 and can be very easily disassembled.

FIG. 1 is a sectional view of a conventional paper tube used as a void tube. FIG. 2 is an explanatory view of an operation procedure for separating a paper tube from a concrete structure using a dedicated void tube remover. FIG. 2 is a sectional view of a paper tube according to the present invention. Explanatory drawing about the winding angle of the band-shaped paper in a cylinder layer. Explanatory drawing about the disassembly procedure of the paper tube which concerns on this invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Paper core 2 and 3 Tube layer 4 Strip paper 5 Side 6 Edge part 7 Adhesive 8 Pulling piece

Claims (12)

In a paper tube formed by stacking a plurality of tubular layers formed by spirally winding a band-shaped paper, by adjusting an adhesive for bonding the layers between the tubular layers, it is possible to reduce the adhesive force between the tubular layers. Characteristic paper tube. 2. The paper tube according to claim 1, wherein the adhesive force between the cylindrical layers is weakened by partially applying an adhesive for bonding between the cylindrical layers. The paper tube according to claim 1, wherein the adhesive force between the cylinder layers is weakened by using an adhesive having a weakened adhesive force as an adhesive for bonding between the cylinder layers. (4) A paper tube formed by stacking a plurality of tubular layers formed by spirally winding a strip of paper, wherein the layers between the tubular layers are not bonded to each other. One strip of paper is formed by stacking a plurality of tubular layers spirally wound with their edges overlapping each other, and the edges of each tubular layer are fixed with an adhesive so as not to lose their shape. A paper tube characterized in that an adhesive is partially applied between the layers so as to be easily peeled off and adhered to each other. One strip of paper is formed by stacking a plurality of tubular layers spirally wound with their edges overlapping each other, and the edges of each tubular layer are fixed with an adhesive so as not to lose their shape. A paper tube characterized in that the layers between the layers are bonded with an adhesive whose adhesive force is adjusted so that the layers can be easily separated. One strip of paper is formed by stacking a plurality of tubular layers spirally wound with their edges overlapping each other, and the edges of each tubular layer are fixed with an adhesive so as not to lose their shape. A paper tube characterized in that the layers do not adhere to each other. The paper tube according to any one of claims 5 to 7, wherein one strip-shaped paper is formed by reducing the thickness of the edge portion by shifting and stacking papers of the same shape. A plurality of tubular layers are formed by spirally winding one strip of paper so that the edge portions thereof do not overlap, and each of the tubular layers is positioned at the edge portion at the edge of the strip paper in another layer. A paper tube characterized in that it is laminated so as not to coincide with the position of the portion, and an adhesive is partially applied and adhered between the cylindrical layers so as to be easily separated. A plurality of tubular layers are formed by spirally winding one strip of paper so that the edge portions thereof do not overlap, and each of the tubular layers is positioned at the edge portion at the edge of the strip paper in another layer. A paper tube characterized in that it is laminated so as not to coincide with the position of the portion, and the layers between the cylindrical layers are bonded with an adhesive whose adhesive force is adjusted so as to be easily separated. The paper tube according to claim 9 or 10, wherein one band-shaped paper is formed by laminating papers of the same shape. The paper sleeve according to any one of claims 1 to 11, wherein the angle at which the belt-shaped paper is spirally wound differs depending on each tubular layer.

Images