Paper tube and roll body equipped therewith

Abstract

To provide a reusable paper tube that can be easily removed from a roll-shaped strip. [Solution] The paper tube 1 is equipped with a cylindrical body 10 for winding the strip-shaped body 5. The cylindrical body 10 has a gap 3 formed in it that extends from one end in the axial direction to the other, in a direction substantially parallel to the axis of the cylindrical body 10. The roll body 11 is equipped with the paper tube 1 and the strip-shaped body 5 wound around the paper tube 1 as a core.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a paper tube used for winding a strip.

Background Art

[0002] Paper tubes are widely used as the winding cores of commercially distributed strips such as films and adhesive products. The roll-shaped strip is distributed with a paper tube attached, and is printed, cut, etc. according to the application and processed into a final product.

[0003] In response to the recent increase in environmental awareness, an operation has started to recycle the release sheet after use of an adhesive sheet provided with a surface base material, an adhesive layer, and a resin-made release sheet in this order. In this operation, used release sheets are collected in a roll state from the users of the adhesive sheet, foreign matters, etc. are removed, and then an attempt is made to recycle them as the resin material of the release sheet.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Paper tubes are also used when winding used release sheets into a roll, but since they are removed as foreign matters in the process of recycling the release sheets as a resin material, it is convenient if they can be easily removed from the roll.

[0006] Japanese Patent Publication No. 2014-177340 (Patent Document 1) describes a technique for making it easier to remove a cylindrical core from a sheet after it has been wound by making a cut parallel to the axial direction of the cylinder in the core. However, while the core described in Patent Document 1 is made of metal, thermoplastic resin, or fiber-reinforced plastic (FRP), a paper tube is mainly composed of paper. Therefore, if the same cut is made in the paper tube as in the core, the paper tube may deform and become irreparable when it is removed. As a result, the paper tube cannot be reused, which may increase recycling costs and lead to the waste of resources.

[0007] The object of the present invention is to provide a paper tube that can be easily removed from a roll-shaped strip and is reusable. [Means for solving the problem]

[0008] An example of a paper tube disclosed herein comprises a tubular body for winding a strip of material. The tubular body has a gap formed therein extending from one end in the axial direction to the other, in a direction substantially parallel to the axis of the tubular body.

[0009] The roll body disclosed herein comprises the above-mentioned paper tube and a strip-shaped body wound around the paper tube as a core. [Effects of the Invention]

[0010] The paper tube disclosed herein can be easily removed from a roll-shaped strip and is reusable. [Brief explanation of the drawing]

[0011] [Figure 1] Figure 1 is a perspective view showing a paper tube according to one embodiment of the present disclosure. [Figure 2] Figure 2 is a side view showing the paper tube shown in Figure 1. [Figure 3] Figure 3 is a side view showing the roll body after the strip material has been wound up by inserting the paper tube shown in Figure 1 onto the shaft of the winding device. [Modes for carrying out the invention]

[0012] Figure 1 is a perspective view showing a paper tube according to one embodiment of the present disclosure. Figure 2 is a side view showing the paper tube of this embodiment shown in Figure 1. Figure 3 is a side view showing a roll body after the paper tube shown in Figure 1 has been inserted onto the shaft of a winding device and the strip-shaped material has been wound up.

[0013] As shown in Figures 1 to 3, the paper tube 1 according to an example of this embodiment includes a cylindrical body 10 for winding the strip-shaped body 5. The cylindrical body 10 has a gap 3 that extends from one end in the axial direction to the other, in a direction substantially parallel to the axis of the cylindrical body 10. Here, "a direction substantially parallel to the axis of the cylindrical body 10" means a direction that forms an angle of ±5 degrees or less with respect to the axis of the cylindrical body. Because the gap 3 is formed in the cylindrical body 10, the paper tube 1 can be easily pulled out from the roll body 11 formed by the paper tube 1 and the strip-shaped body 5 wound around the paper tube 1.

[0014] The paper tube 1 in this embodiment is preferably made of paper. For example, the paper tube 1 is made by cutting and removing a portion of a commercially available paper tube, which is manufactured by spirally winding a strip of cardboard base paper containing recycled paper onto an iron core, in a direction parallel to the axis of the cylindrical body to form a gap 3. The gap 3 may be formed using a commercially available machine tool, or it may be formed manually using a cutter knife or the like. At least the surface layer of the paper tube 1 may be made of impregnated paper impregnated with resin, or a known release layer may be provided.

[0015] In this case, a resin core such as FRP is not used in the manufacture of the paper tube 1. Resin cores are more difficult to cut than paper tubes, and even if a gap is formed, it may quickly shrink in diameter due to residual stress and close the gap. In contrast, when the paper tube 1 of this embodiment is manufactured by processing a paper tube whose main component is paper, the gap 3 formed by cutting is maintained in the shape it was in during processing.

[0016] The inner diameter d of the cylindrical body 10 is preferably greater than, for example, 10 mm, but may be 500 mm or less. If the inner diameter d is too small, the width w of the gap 3 will also be very small, so the purpose of forming the gap 3 will be diminished. In this specification, the width w of the gap 3 refers to the distance between one inner end of the cylindrical body 10 and the other end opposite it, as shown in Figure 2.

[0017] The width w of the gap 3 may be 2 mm or more. The ratio w / d of the width w of the gap 3 to the inner diameter d of the cylindrical body 10 may be, for example, 1 / 10 or more and 2 / 3 or less. By having the w / d value within this range, the paper tube 1 can be given sufficient strength to prevent bending or deformation during the transport of the roll body 11, while also being able to be sufficiently reduced in diameter when the paper tube 1 is removed. Furthermore, it becomes possible to reuse the paper tube 1 after it has been removed from the roll body 11.

[0018] The width w of the gap 3 is preferably constant from one end to the other in the axial direction of the paper tube 1 in order to form a roll body 11 with both ends aligned. However, it is acceptable if the ratio of the width w1 of the narrowest part to the width w2 of the widest part (w1 / w2) is, for example, 0.8 or more. In this case, for the numerical range of w / d mentioned above, the average value of w1 and w2 shall be treated as the width w of the gap 3.

[0019] The thickness t of the cylindrical body 10 may be, for example, 0.5 mm or more and 15 mm or less. If the thickness t of the cylindrical body 10 is 0.5 mm or more, the paper tube 1 is given strength that can withstand the transport of the roll body 11 and the paper tube 1 can be easily reused. If the thickness t of the cylindrical body 10 is 15 mm or less, the cylindrical body 10 can be easily reduced in diameter by pressing, so the paper tube 1 can be easily pulled out from the roll body 11. If the thickness t of the cylindrical body 10 is 1 mm or more and 10 mm or less, the paper tube 1 according to this embodiment can be manufactured by processing a commercially available paper tube that is widely available. Furthermore, by making the thickness t of the cylindrical body 10 1 mm or more, the paper tube 1 can be reused more times.

[0020] The width of the cylindrical body 10 is not particularly limited, but if it is 200 mm or more, the advantage that the paper tube 1 can easily come out from the side of the roll body 11 can be more effectively utilized.

[0021] The strip 5 is not particularly limited in material as long as it is a long sheet, and may be a single-layer structure or a laminate composed of multiple layers. Since there is a possibility that a step mark may be formed in the wound strip 5 due to the formation of the gap 3, the paper tube 1 of the present embodiment is preferably used when recovering a used sheet for which step marks are not a problem, for the purpose of recycling or the like. For example, the strip 5 may be a sheet having at least one selected from used paper, a resin film such as peeled from an adhesive sheet, used woven fabric, and non-woven fabric. Further, when a sheet that is unlikely to cause step marks, such as a woven fabric or non-woven fabric, is used as the strip 5, the paper tube 1 of the present embodiment can be adopted even if it is new.

[0022] In the examples shown in FIGS. 2 and 3, the cut surface of the end portion of the cylindrical body 10 in the gap 3 is in the direction toward the center of the cylindrical body 10 when viewed from the side, but it may be a surface inclined so as to spread more from the inside to the outside, or may be a surface inclined so as to become narrower from the inside to the outside.

[0023] An example of a method for winding the strip 5 using the paper tube 1 of the present embodiment is as follows. From an adhesive sheet provided with a resin base material, an adhesive layer, and a release sheet in this order, the release sheet is peeled off and wound around the paper tube 1 as the strip 5. At this time, a roll-shaped adhesive sheet for lamination is installed on the air shaft on the unwinding side, and the paper tube 1 of the present embodiment is inserted into the air shaft 7 on the winding side. Next, after inserting the end portion 9 of the strip (release sheet) 5 peeled off from the adhesive sheet between the air shaft 7 on the winding side and the inner surface of the cylindrical body 10 through the gap 3 of the paper tube 1, the air shaft 7 is expanded in diameter to fix the end portion 9. Subsequently, by continuously unwinding the adhesive sheet and winding the strip 5, a roll body 11 having the paper tube 1 and the strip 5 is formed on the winding side. After the winding process is completed, the air is removed from the air shaft 7, and the roll body 11 is removed from the air shaft 7. Next, the paper tube 1 is pressed inward from one end side of the roll body 11, and the paper tube 1 is pulled out from the roll body 11 in a state where the diameter is reduced.

[0024] According to this method, since the end portion 9 of the strip 5 can be fixed to the paper tube 1 without using an adhesive tape or the like, the extraction of the paper tube 1 from the roll body 11 can be facilitated.

[0025] The configuration of the paper tube 1 of the present embodiment described above, the roll body 11 including the same, the width and shape of the gap 3, etc. can be appropriately changed without departing from the spirit of the present invention.

Example

[0026] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[0027] - Production of a winding core (paper tube)- A commercially available paper tube (cylindrical body) with an inner diameter d of 3 inches (76.2 mm), a thickness t of 3 mm, and a width of 530 mm, made by laminating paper tube base paper, was cut and removed in a direction parallel to the axis of the paper tube to create a paper tube with a predetermined gap w. The gap width was 20.0 mm in Example 1, 30.0 mm in Example 2, and 60.0 mm in Example 3.

[0028] A paper tube was prepared in the same manner as in Example 1, except that a paper tube with a cylindrical body thickness t changed to 1 mm was used, and this was designated as Example 4.

[0029] Comparative Example 1 was created by taking a paper tube with the same inner diameter of 76.2 mm and thickness t of 3 mm as in Example 1, and making a cut from one end to the other parallel to the axis of the paper tube. As Comparative Example 2, a polypropylene (PP) core with an inner diameter d of 76.2 mm and thickness t of 5 mm was cut and removed in a direction parallel to the axis of the core, with a width of 20.0 mm. Immediately after removing the 20.0 mm section, the core reduced in diameter and the gap changed to 0 mm.

[0030] - Removal of the release sheet (strip) and the paper core (winding core) - A 520mm long recyclable laminate film (manufactured by Nichiei Shinka Co., Ltd.), comprising a resin base material, an adhesive layer, and a release sheet in that order, was installed in the unwinding section of a known cold laminator. A paper tube (winding core) prepared by the above method was inserted into the air shaft of the winding section of the cold laminator, and the release sheet peeled from the laminate film was wound onto the paper tube. Next, the air shaft was removed from the winding section, and the air shaft was pulled out from the roll of release sheet. Then, while holding down the end, the paper tube was pulled out from the roll. Here, if the paper tube was easily removed, it was evaluated as ○; if the paper tube was difficult to remove or could not be removed without deforming the paper tube with strong force, it was evaluated as △; and if the paper tube could not be removed, it was evaluated as ×.

[0031] - Durability check - We checked whether the paper tubes or cores could withstand repeated use. Specifically, one set consisted of winding the paper tube and removing it from the roll, and this was repeated five times to check for irreversible deformation or damage to the paper tubes. If no deformation or damage was observed in the paper tube after five sets, it was judged as ○; if slight deformation or damage was observed but the paper tube could still be used, it was judged as △; and if deformation or damage rendered the paper tube unusable after five sets, it was judged as ×.

[0032] —Evaluation Results— Table 1 shows the results of evaluating the ease of removing the paper core from the roll. Table 1 also shows the durability of the paper core.

[0033] [Table 1] As shown in Table 1, when the thickness of the paper tube was 3 mm, a comparison of the paper tubes made in Examples 1 to 3 revealed that all of them could be easily pulled out of the roll and remained usable as paper tubes even after repeated use in 5 sets. However, in Example 3, where the gap width was 60.0 mm and the value of (gap width w) / (paper tube inner diameter d) exceeded 2 / 3, deformation was observed in the paper tube after use, confirming that its durability was somewhat inferior. Furthermore, a comparison between the paper tube made in Example 1 and the paper tube made in Example 4 confirmed that even with the same gap width, a thicker tubular body resulted in improved durability.

[0034] On the other hand, in the paper tube prepared as Comparative Example 1, which had a slit with a gap width of 0 mm, it was necessary to deform one end by pushing it under the other end with strong force when pulling it out of the roll, and the pulled-out paper tube was irreversibly deformed. Also, the winding core prepared as Comparative Example 2 was made of PP, so the gap that was formed closed immediately, and the inner diameter shrank from the original 76.2 mm to about 68-69 mm. As a result, it was not possible to insert the winding core into a shaft of the specified diameter. Therefore, it was not possible to measure the ease of removal and durability of the paper tube. [Industrial applicability]

[0035] The paper tube of this disclosure is useful for forming rolls as a core for winding various strip-shaped materials. [Explanation of symbols]

[0036] 1 paper tube 3 gaps 5. Band-shaped body 7 Air Shaft 9 End of the band-shaped body 10. Cylindrical body 11 rolls

Claims

1. It is equipped with a cylindrical body for winding up a strip-shaped material, The aforementioned cylindrical body has a gap formed in it that extends from one end in the axial direction to the other, in a direction substantially parallel to the axis of the cylindrical body.

2. The paper tube according to claim 1, wherein the tubular body is made of paper.

3. The inner diameter d of the cylindrical body is greater than 10 mm. The width w of the gap is 2 mm or more. The paper tube according to claim 1, wherein w / d is 1 / 10 or more and 2 / 3 or less.

4. The paper tube according to claim 1, wherein the thickness of the cylindrical body is 0.5 mm or more and 15 mm or less.

5. The paper tube according to claim 1, wherein the strip-shaped body is a used sheet having at least one selected from paper, resin film, woven fabric, and nonwoven fabric.

6. The paper tube according to claim 1, wherein the width of the side surface of the cylindrical body is 200 mm or more.

7. A paper tube according to any one of claims 1 to 6, A strip-shaped body wound around the aforementioned paper tube as a core and A roll body equipped with this feature.

8. The roll body according to claim 7, wherein the end of the strip-shaped body is inserted into the inside of the cylindrical body through a gap in the cylindrical body.

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