JP7278824B2 - Adhesive tape core and adhesive tape roll using this core - Google Patents

Description

TECHNICAL FIELD The present invention relates to an adhesive tape core and an adhesive tape roll using this core.

Most adhesive tapes are sold in the form of a roll wound around a paper core, which is a cylindrical body made of paper. Since these adhesive tapes are wound around a core with a certain tension applied during their manufacture, there is internal stress strain in the wound tape, which causes shrinkage. As a result, a telescopic phenomenon (bamboo shoot phenomenon) may occur in the wound adhesive tape, or deformation such as partial crushing of the core may occur.
Further, depending on the type of adhesive tape, new internal stress may be generated due to the effects of humidity, temperature, etc. during storage of the wound adhesive tape, causing deformation.

In order to avoid such various deformations, a foam sheet having closed cells such as polyethylene or polyolefin is wound around the outside of the core, and an adhesive tape is wound thereon. Deformation is prevented by, for example, absorbing and relaxing the internal stress.

Such cores are discarded after the adhesive tape is completely rewound and used. Since it does not decompose, it causes environmental pollution if left unattended. Moreover, even if it is to be reused, it is necessary to separate the paper from the foamed sheet, and when a large amount of the material is incinerated as it is, there is also the problem that high combustion heat is generated and damages the incinerator.

For this reason, the applicant has previously proposed a foam sheet that uses a biodegradable plastic for the winding core (Patent Document 1). This core is naturally biodegradable even if it is left after disposal, and when incinerated, it generates only low combustion heat and can be easily incinerated, so it is environmentally friendly. The cost is relatively high, and it has not reached the point where it can be widely used.

Therefore, the applicant then provided a product in which the core of the single-faced cardboard was placed inside the outer side of the paper tube, the liner side was placed on the front side, and the adhesive tape was wound around the core. (Patent document 2)

JP-A-8-217338 Japanese Patent Application No. 2017-186837

The present invention is an improvement over the prior art described above, which absorbs and reduces the internal stress strain caused by winding the adhesive tape, holds the wound adhesive tape as normally as possible, and maintains the adhesiveness. To prevent a core discarded after a tape has been completely decomposed even in a natural environment to cause environmental pollution, to be recycled, and to be used in large quantity at the same time. To provide a core for an adhesive tape and an adhesive tape wound body in which the adhesive tape is wound thereon, while also preventing the problem of damage to an incinerator due to the generation of high heat of combustion even when incinerating the adhesive tape. is produced efficiently and industrially so that it can be obtained extremely economically.

The present invention relates to a core for winding an adhesive tape, in which a liner and a A single-faced corrugated board having a midsole is wrapped to form an outer tubular body. The single-faced corrugated board of this outer tubular body has a thickness of 1.3 to 0.6 mm and a corrugated medium with 90 to 125 corrugations per 30 cm. Half-cut lines or crease lines are provided in parallel in a direction intersecting the ridges of the core, and such single-faced corrugated cardboard is spirally wound around the inner tubular body to form a core for adhesive tape. is.
Further, the half-cut line or the creasing line extends along the longitudinal direction of the core, and the single-faced corrugated board is spirally wound.
Further, the single-faced corrugated board is preferably wound around the inner tubular body with the inner side facing outward.
Then, the adhesive tape is wound around such a winding core to form an adhesive tape roll.

According to the present invention, the adhesive tape can be reliably wound around the core, and the outer tubular body effectively absorbs the action of shrinking due to the internal stress strain that occurs during winding, and the telescope phenomenon occurs. deformation such as crushing of a part of the winding core. In addition, depending on the type of adhesive tape, new internal stress may be generated due to the influence of humidity, temperature, etc. during storage of the wound adhesive tape, but this can also be effectively absorbed. It can prevent deformation.

The core which is discarded after the adhesive tape is completely rewound and used does not naturally decompose in the natural environment and cause environmental pollution, and can be recycled as a paper material. At the same time, even if a large amount of waste is incinerated, there is no problem of generating high heat of combustion and damaging the incinerator.

Furthermore, since the outer tubular body has many parallel half-cut lines or crease lines in the middle of the single-faced corrugated board that do not reach the liner in a direction that intersects the crests of the middle, The single-faced corrugated board can be easily spirally wound around the inner tubular body, and furthermore, mechanical production can be easily performed, and efficient manufacturing can be economically performed.

It is a front view which shows the Example of the winding core of this invention. 1. It is the top view (B) and side view (A) of the single-faced corrugated board used for the winding core shown in FIG. FIG. 5 is an explanatory view of spirally winding the single-faced corrugated board of the outer tubular body around the inner tubular body of the core. FIG. 2 is a front view of an adhesive tape roll in which an adhesive tape is wound around the core shown in FIG. 1;

The winding core 1 has an inner tubular body 2 formed of a paper tube, has a width corresponding to the width of the adhesive tape to be wound, and has an appropriate thickness so as not to deform even when the adhesive tape is wound. have.
The illustrated inner tubular body 2 has an inner diameter of 76.5 mm (3 inches) and a thickness of 2.0 mm. can.
The inner surface of the inner tubular body 2 is usually covered with a thin inner surface paper for makeup.

An outer tubular body 4 is provided outside the inner tubular body 2, and a single-faced corrugated board 5 is used as the outer tubular body. The single-faced corrugated board of the outer tubular body 4 has a liner 6 and a core 7, and the thickness (corrugation height) including both of them is about 1.3 to 0.6 mm. of about 90 to 125 is used. Preferably, the thickness is about 0.7 to 0.6 mm, and the number of steps is about 120±5 per 30 cm.

The single-faced corrugated board 5 forming the outer tubular body 4 is generally E-tier (1.2 mm thick, 93±5 tiers per 30 cm) or F-tier (0.6 mm thick, 93 ± 5 tiers per 30 cm). 120) can be used.

The single-faced corrugated board 5 of the outer tubular body 4 is provided with a half-cut line 10 in a direction intersecting the crests 8 and the troughs 9 of the core 7 . Although this half-cut line 10 has a cut in the medium 7, it is preferable that the liner 6 is not cut.
A large number of the half-cut lines 10 are preferably provided in parallel. In the illustrated one, the half-cut lines 10 are formed in parallel at intervals of about 2 to 10 mm, preferably at intervals of about 2 to 7.5 mm. If the gap is too narrow, manufacturing becomes troublesome.

Such a single-faced cardboard 5 can be smoothly wound by winding it around the spiral 14 at an appropriate angle around the outer surface of the paper tube of the inner tubular body 2 . In this case, the side edges 15 of the single-faced corrugated cardboard 5 are preferably butted against each other without causing a step, and at that time, a slight gap is allowed between the side edges 15.例文帳に追加

When the half-cut line 10 is provided in the core 7 of the single-faced cardboard 5, it is preferable to set the angle at which the single-faced cardboard 5 is spirally wound around the inner tubular body 2, or at an angle similar thereto. In this way, the half-cut line 10 formed on the single-faced corrugated board 5 spirally wound around the inner tubular body 2 extends or substantially extends along the longitudinal direction of the inner tubular body of the winding core. Therefore, the single-faced cardboard 5 can be smoothly spiral-wound without resistance.

In the above embodiment, the half-cut line 10 is provided on the inner 7 of the single-faced corrugated board 5, but instead of the half-cut line, it is also possible to similarly provide a crease line by means of a push blade roller or the like. Also, the half-cut line 10 and the crease line may be used together.

The above-mentioned single-faced cardboard 5 is usually easier to wind when it is spirally wound around the inner tubular body 2 with the core 7 on the outside as shown in the figure. Since it can be spirally wound on both sides, it can be wound from either side.

When the single-faced corrugated cardboard 5 is wound in a spiral with the core 7 on the outside, if the adhesive tape is wrapped around the core as it is, there will be irregularities due to the crests 8 and the valleys 9 of the core 7, and the adhesive tape will not work. If the material is transparent, the ridges 8 and troughs 9 can be seen through, giving a strange feeling, and the appearance may be poor. do it.
In the illustrated one, a liner paper 16 with a thickness of about 0.2 mm is similarly wound in a spiral shape, and a thin surface paper with a thickness of about 50 μm is further wound thereon.

The single-faced cardboard 5 of the outer tubular body 4 is fixed to the outer surface of the paper tube of the inner tubular body 2 by an adhesive interposed therebetween. Further, it is preferable to use an adhesive to fix between the single-faced cardboard 5 and the liner paper 16 and between the liner paper 16 and the surface paper.
The adhesive is not particularly limited, but if a water-soluble adhesive is used, it is environmentally friendly when the core is discarded.

The adhesive tape roll 21 can be obtained by winding the adhesive tape 20 to a desired length around the core 1 while applying tension. Generally, it is preferable to wind a wide adhesive tape around a long core and cut it into round slices having a width of 15 mm, 18 mm, 20 mm, or other widths according to the application to form an adhesive tape roll.
As the adhesive tape, various tapes using cellophane tape, plastic tape, metal tape, paper tape, etc. as the base material can be used.

As described above, the wound adhesive tape 21 is likely to be subject to internal stress strain due to the winding of the adhesive tape 20. , the strain is mainly absorbed by the core 7, and deformation such as the telescope phenomenon can be prevented.
In particular, cellophane adhesive tapes are effective because cellophane easily expands and contracts according to changes in temperature and humidity, and the outer tubular body 4 provided on the winding core can effectively absorb such changes.

Examples and comparative examples shown below were produced and prepared, and the following tests were carried out to see their performance.
(Example 1)
Inner tubular body (paper tube): Four layers of 0.5 mm thick/0.5 mm thick/0.5 mm thick/0.5 mm thick base paper are stacked from the inside toward the outside, and the innermost layer is 0.08 mm thick. A paper tube having a total thickness of 2.08 mm, an inner diameter of 76.5 mm, and a length of 660 mm was prepared.

Outer tubular body (single-faced corrugated board): A liner with a basis weight of 120 g/m ² , a base paper with a basis weight of 120 g/m ² as a medium, a thickness of 0.6 mm, and F stages with a number of stages per 30 cm of 120 prepared. On the middle side of the single-faced cardboard, half-cut lines were formed in parallel at intervals of 2 mm to intersect the direction in which the ridges of the middle ridge extend at an angle of 60 degrees.

Winding core: 60 degrees to the longitudinal direction of the inner tubular body (cardboard tube) so that the center side of the outer tubular body (single-faced corrugated board) faces the outer surface of the inner tubular body (cardboard tube). The single-faced corrugated board was wound in a spiral so that the side edges of the single-faced corrugated board were butted against each other at an angle of , and bonded with a water-soluble adhesive. At this time, the half-cut line of the single-faced corrugated board extends along the longitudinal direction of the paper tube.
A liner paper with a thickness of 0.19 mm was similarly spirally wound around the outer side of the single-faced cardboard, and the liner paper was covered with a surface paper with a thickness of 0.05 mm.

Adhesive tape roll: A cellophane adhesive tape with a width of 600 mm, which is obtained by applying a rubber adhesive layer to a thickness of 17 μm on a base material of cellophane with a thickness of 34 μm, on a core of 660 mm in length, and a length of 70 m. wrapped around. Then, this was cut into round slices with a width of 15 mm to prepare an adhesive tape roll.

(Example 2)
Half-cut lines provided on the inner side of the outer tubular body (single-faced corrugated board) of the core were formed in parallel at intervals of 5 mm, and a core and adhesive tape roll were produced in the same manner as in Example 1. .
(Example 3)
The half-cut lines provided on the inner side of the outer tubular body (single-faced corrugated board) of the core are formed in parallel at intervals of 7.5 mm, and the core and adhesive tape winding are formed in the same manner as in Example 1. made.

(Comparative example 1)
Half-cut lines provided on the inner side of the outer tubular body (single-faced corrugated cardboard) of the core were formed in parallel at intervals of 15 mm, and a core and adhesive tape roll were produced in the same manner as in Example 1. .

(Comparative example 2)
Half-cut lines provided on the inner side of the outer tubular body (single-faced corrugated board) of the core were formed in parallel at intervals of 20 mm, and a core and adhesive tape roll were produced in the same manner as in Example 1. .
(Comparative Example 3)
Half-cut lines provided on the inner side of the outer tubular body (single-faced corrugated board) of the core were formed in parallel at intervals of 25 mm, and a core and adhesive tape roll were produced in the same manner as in Example 1. .

(test)
The following tests were conducted to evaluate the core and adhesive tape roll.

(Wrap test of single-faced cardboard)
It was tested whether or not the single-faced corrugated board could be wound well at the stage of forming the winding core.
(Evaluation criteria)
・The single-faced cardboard can be spirally wound smoothly around the inner tubular body.○
・The single-faced cardboard cannot be smoothly spirally wound around the inner tubular body.△
・Single-faced corrugated cardboard cannot be spirally wound around the inner tubular body....×

(Appearance test of adhesive tape roll)
The appearance of the adhesive tape roll after production was visually observed and judged.
(Evaluation criteria)
・No irregularities on the inner side of the single-faced cardboard can be seen as a pattern, and no air bubbles can be seen between the core and the adhesive tape...○
・There is no uneven pattern on the inner side of the single-faced cardboard, but air bubbles can be seen between the core and the adhesive tape...△
・The irregularities on the inner side of the single-faced cardboard are conspicuous as patterns, and the air bubbles are conspicuous between the core and the adhesive tape....×

(Telescopic test of adhesive tape roll)
The adhesive tape roll was stored in an environment of 30° C. and 70% relative humidity for 30 days, and the telescopic amount was measured. The number of individuals tested was 5 rolls each.
(Evaluation criteria)
・The telescope length of all 5 rolls is 2 mm or less...○
・In 5 rolls, the telescope amount is 2mm or less and more than 2mm are mixed...△
・The telescope amount of all 5 rolls is over 2mm...×

(Test results)
The results of Test 1 are shown in Tables 1 and 2.

(Discussion)
As shown in Table 1, all of Examples 1 to 3 gave good results in each test.
On the other hand, in Comparative Examples 1 and 2, good results were not obtained in the appearance test of the adhesive tape roll. In addition, in Comparative Example 3, favorable results were not obtained in either the single-faced corrugated cardboard wrapping test or the pressure-sensitive adhesive tape roll appearance test. In the appearance test of the adhesive tape roll, air bubbles can be seen between the core and the wound adhesive tape. It is thought that what is confined is expressed.
Regarding Comparative Examples 1 to 3, the winding test of the single-faced cardboard and/or the appearance test of the adhesive tape roll did not yield good results, so the telescope test of the adhesive tape roll was omitted. bottom.

1 Adhesive tape core 2 Inner tubular body 4 Outer tubular body 5 Single-faced cardboard 6 Liner 7 Core 8 Core peak 9 Core valley 10 Half-cut line 14 Spiral 20 Adhesive tape 21 Adhesive tape roll

Claims (6)

A winding core for winding an adhesive tape in a roll state, comprising an inner tubular body made of a paper tube having a width corresponding to the width of the adhesive tape and an appropriate thickness not to be deformed, and an outer circumference of the inner tubular body. An outer tubular body is provided in which a single-faced corrugated cardboard having a liner and a core is wrapped around its surface, and the thickness of the single-faced corrugated board is 1.3 to 0.6 mm, and the number of corrugated layers is 90 to 125 per 30 cm. Half-cut lines or crease lines that do not reach the liner are formed at intervals of 2 to 10 mm in parallel in a direction intersecting the ridges of the medium , and this single-faced corrugated cardboard is spirally formed on the outer peripheral surface of the inner tubular body. The half-cut line or the creasing line is such that when the single-faced cardboard is wound around the inner tubular body, the crossing angle provided on the single-faced cardboard is along the longitudinal direction of the core. A winding core for an adhesive tape formed so as to match the angle of spiral winding around a tubular body . 2. The adhesive tape winding core according to claim 1 , wherein the outer tubular body is wound around the inner tubular body with a middle sheet of single-faced corrugated cardboard having a half-cut line or a crease line facing outward. 3. The pressure-sensitive adhesive tape core according to claim 2 , wherein a liner paper covering the surface of said single- faced corrugated cardboard medium having half-cut lines or crease lines is wound thereon. The pressure-sensitive adhesive tape core according to any one of claims 1 to 3 , wherein the thickness of the single-faced corrugated cardboard of the outer tubular body is 0.7 to 0.6 mm, and the number of corrugations of the inner core is 120±5 per 30 cm. An adhesive tape roll formed by winding an adhesive tape around the adhesive tape winding core according to any one of claims 1 to 4 . 6. The adhesive tape roll according to claim 5 , wherein the adhesive tape is a cellophane adhesive tape.

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