JP7719479B2 - Cardboard protective tape - Google Patents

Description

The present invention relates to a protective tape for corrugated cardboard that prevents hand tears caused by the sides of corrugated cardboard.

Corrugated cardboard is reusable, environmentally friendly, inexpensive, lightweight, durable, and easy to process, and is therefore used for a variety of purposes, including packaging boxes, furniture, ornaments, toys, and more.

In the manufacture of such corrugated boards, a cutting method called die cutting is typically used, in which a corrugated board sheet formed by laminating cardboard base paper together is fitted into a die and punched out with a blade in accordance with standards such as JIS. The cut surfaces that form the sides of the corrugated board punched out by this die are sharp and can easily cut fingers and hands, resulting in injuries to workers and users.

One technology to prevent such hand cuts is to form the blades used in cutting dies into a special shape, such as a wavy one, to make the sides of the cardboard less likely to cut fingers (see Patent Document 1). However, in this case, the use of specially shaped blades poses problems such as the investment costs for manufacturing the blades and the corresponding equipment, as well as the low durability of the blades, which increases the running costs for replacement and maintenance. Furthermore, even when using such specially shaped blades, there is the problem that sharp edges remain on the cut surfaces of the cardboard.

JP 2018-130792 A

The objective of this invention is to provide a new means of preventing hand cuts caused by the sides of corrugated cardboard.

While investigating the issue of hand cuts caused by the sides of corrugated cardboard, the inventors focused on processing the sides of the corrugated cardboard after cutting, rather than processing the sides of the cardboard when cutting the sheet, and tried various methods. As a result, they discovered that by using a protective tape for corrugated cardboard that is configured with a strip-shaped main body that is attached to the side of the corrugated cardboard and multiple protrusions that are attached to the front and back surfaces of the cardboard, it is possible to easily and accurately cover the side (cut surface) of the corrugated cardboard, protecting the user's hands from the sharp edges of the cut surface of the cardboard, and thus completed the present invention.

That is, the present invention is as follows.
[1] A protective tape for corrugated board that is attached to the side of a corrugated board, including the side where the core of the board is exposed,
A protective tape for cardboard, characterized in that it comprises a band-shaped main body portion that is attached to the side of the cardboard board, and a plurality of protrusions provided on both sides of the band-shaped main body portion and attached to the front and back surfaces of the cardboard board.
[2] The protective tape for cardboard according to [1] above, characterized in that it has a linear fold at the boundary between the belt-shaped main body portion and the convex portion.
[3] The protective tape for cardboard according to [1] or [2] above, characterized in that the width of the belt-shaped main body portion corresponds to the thickness of the side of the cardboard board.
[4] The protective tape for cardboard according to any one of [1] to [3] above, characterized in that the width length of the belt-shaped main body portion is any one of 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, and 50 mm.
[5] The cardboard protective tape according to any one of [1] to [4] above, characterized in that the plurality of convex portions provided on both sides of the belt-shaped main body portion are provided continuously in the tape length direction and are formed in a wavy pattern undulating at regular intervals.
[6] The protective tape for cardboard according to any one of the above [1] to [5], characterized in that the height of the plurality of convex portions is 6 to 8 mm.

[7] A protective corrugated board characterized in that the protective tape for corrugated board according to any one of [1] to [6] above is attached to a side portion including a side portion on which the core of the corrugated board appears.
[8] A method for manufacturing a protective corrugated board, comprising applying the protective tape for corrugated board according to any one of [1] to [6] to a side of a corrugated board, including a side on which the core of the board is exposed.
[9] The method for manufacturing a protective corrugated board according to the above [8], characterized in that the protective tape for corrugated board is applied to the side of the corrugated board while being heated.

The cardboard protective tape of the present invention can be easily and accurately applied to cardboard boards, preventing hand tears caused by the sides of the cardboard boards.

1 is an explanatory diagram of a cardboard protective tape according to a first embodiment of the present invention. 2 is a photograph of a protective corrugated board according to the first embodiment, which is provided with the protective tape for corrugated board shown in FIG. 1 . 3 is a photograph of a protective corrugated board according to a second embodiment, which is provided with the protective tape for corrugated board shown in FIG. 1 .

The protective tape for cardboard of the present invention is a protective tape for cardboard that is applied to the side of a cardboard board, including the side where the core of the cardboard board appears, and is characterized by having a band-shaped main body portion that is applied to the side of the cardboard board, and a plurality of protrusions that are provided on both sides of the band-shaped main body and are applied to the front and back surfaces of the cardboard board.
In this invention, the "side surface" refers to a cut surface where the core of the cardboard appears, and includes the inner peripheral side surface where the core of the cardboard appears when the cardboard is cut out. In addition, the "front and back surfaces" in this invention refer to the surfaces of the two flat plates (liners) that form the front and back surfaces of the cardboard.

The protective tape for cardboard of the present invention can cover (seal) the sides of the cardboard, including the cut surfaces of the cardboard, thereby protecting the user's hands from sharp edges on the cardboard and preventing cuts to the hands caused by the sides of the cardboard.

Furthermore, the band-shaped main body of the cardboard protective tape is attached to the side of a corrugated board, and the multiple protrusions on both sides of the band-shaped main body are attached to the front and back surfaces of the cardboard board, allowing for easy and accurate application to the cardboard board. In other words, when applying the band-shaped main body of the cardboard protective tape of the present invention to the side of a corrugated board, the position of the edge of the side of the cardboard board can be confirmed through the gaps between the protrusions, allowing the cardboard protective tape to be applied neatly and easily along the side of the cardboard board without slipping. When applying conventional band-shaped tapes to the side of cardboard boards, problems arose, such as the tape being unable to be applied straight or being unable to be folded neatly and applied to the front and back surfaces of the cardboard board. However, the cardboard protective tape of the present invention avoids these inconveniences.

Furthermore, the cardboard protective tape of the present invention has its strip-shaped main body attached to the side of the cardboard board and its protruding portions attached to the front and back surfaces of the cardboard board, so it can be firmly attached to the cardboard board without the problem of peeling that occurs when conventional band-shaped tapes are attached to the side of cardboard boards.

The protective tape for corrugated cardboard of the present invention neatly covers the cut surfaces of the side of the corrugated cardboard board, hiding the cut surfaces of the corrugated cardboard board, resulting in a protective corrugated cardboard board with high design quality and excellent aesthetics. It also improves the airtightness of the corrugated cardboard board, resulting in a protective corrugated cardboard board with high thermal insulation properties.

<Corrugated cardboard>
The cardboard board to which the cardboard protective tape of the present invention can be applied is not particularly limited as long as it is what is generally called cardboard, which has a core between two flat plates (liners), and examples of materials for the cardboard board include paper, plastic, etc.

The configuration (structure) of the corrugated cardboard may be one with a single core, or a multi-layer structure with two or more cores (reinforced corrugated cardboard structure). The thickness of the corrugated cardboard is not particularly limited, and may be 3 mm, 4 mm, 5 mm, etc., but the 5 mm thick corrugated cardboard, known as A flute, is the most commonly used. It is also possible to use a product made by appropriately gluing together various types of corrugated cardboard. For example, by gluing together 5 mm thick pieces known as A flute, it is possible to create a product with a thickness of 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, etc.

<Protective tape for corrugated cardboard>
The protective tape for corrugated cardboard of the present invention is an adhesive tape having an adhesive applied to one surface of a substrate.

The material of the substrate can be selected appropriately depending on the type of corrugated board to which it is to be attached, and examples include paper, plastic, and cloth. Paper substrates are suitable for use with paper corrugated board. Specific examples of paper include kraft paper. Plastic substrates are suitable for use with plastic corrugated board. Specific examples of plastic include polypropylene film.

The type of adhesive attached to the substrate is not particularly limited, and examples include rubber-based, acrylic-based, and silicone-based adhesives. The protective tape for cardboard of the present invention may also have a protective layer on the side of the substrate opposite the adhesive to improve water resistance, airtightness, etc.

In addition, the cardboard protective tape may be cut to a predetermined length to match the size of the cardboard board, but it is preferable that it be cut to the appropriate length when used.

[Band-shaped main body]
The strip-shaped main body portion is formed in a long strip shape in the center of the cardboard protective tape and is the portion to be attached to the side of the corrugated cardboard sheet. The width of the strip-shaped main body portion is not particularly limited as long as it can cover the side of the corrugated cardboard sheet, and it is preferable that it corresponds to the thickness of the side of the corrugated cardboard sheet. Note that the width of the strip-shaped main body portion corresponding to the thickness of the side of the corrugated cardboard sheet means a length that is substantially the same as the thickness of the side of the corrugated cardboard sheet when the tape is attached with its center aligned with the side of the corrugated cardboard sheet, and includes a length of tape that extends beyond both sides of the side of the corrugated cardboard sheet by 0.5 mm or less, preferably 0.3 mm or less.

The width of the band-shaped main body can be set appropriately to match the thickness of the corrugated cardboard, but a multiple of 5 mm, the most commonly used thickness of so-called A-flute corrugated cardboard, is preferred. Specifically, any of the following is preferred: 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, and 50 mm. Specifically, for a two-ply reinforced corrugated cardboard structure with two A-flute layers, the preferred width of the band-shaped main body is 10 mm, and for a three-ply reinforced corrugated cardboard structure with three A-flute layers, the preferred width of the band-shaped main body is 15 mm.

[Convex part]
The convex portions are formed on both sides of the belt-shaped main body portion and are attached to the front and back surfaces of the corrugated cardboard. The shape of the convex portions is not particularly limited, and examples thereof include mountain-like, hemispherical, rectangular, and other various shapes. By attaching the belt-shaped main body portion to the side surface of the corrugated cardboard and attaching the convex portions to the front and back surfaces of the corrugated cardboard, the tape can be firmly attached to the corrugated cardboard. Furthermore, when attaching the belt-shaped main body portion of the cardboard protective tape to the side surface of the corrugated cardboard, the position of the edge of the side surface of the corrugated cardboard can be confirmed through the gaps between the convex portions, allowing for neat and accurate attachment to the corrugated cardboard.

It is preferable that the multiple protrusions are arranged intermittently or continuously in the longitudinal direction. An example of an embodiment in which multiple protrusions are arranged intermittently in the longitudinal direction is an embodiment in which the protrusions are arranged at a predetermined interval in the longitudinal direction. The interval between the protrusions is, for example, 5 to 60 mm, preferably 10 to 45 mm, and more preferably 15 to 30 mm.

In addition, examples of embodiments in which multiple protrusions are arranged continuously in the longitudinal direction include an embodiment in which protrusions of the same shape are arranged continuously in the longitudinal direction, an embodiment in which protrusions of different shapes are arranged continuously in the longitudinal direction, an embodiment in which protrusions of different heights are arranged continuously in the longitudinal direction, and an embodiment in which protrusions of different widths and lengths are arranged continuously in the longitudinal direction. The pitch of the protrusions is not particularly limited, and is, for example, 5 to 60 mm, preferably 10 to 45 mm, more preferably 15 to 30 mm, even more preferably 16 to 20 mm, and particularly preferably 18 mm. Specifically, an example of a configuration in which multiple protrusions are arranged continuously in the longitudinal direction and are formed in a wavy pattern that undulates at regular intervals (a predetermined pitch).

The height of the convex portion (the maximum length from the band-shaped main body portion) is not particularly limited, but is, for example, 1 to 20 mm, preferably 3 to 15 mm, more preferably 5 to 10 mm, even more preferably 6 to 8 mm, and particularly preferably 7 mm.

[fold]
The cardboard protective tape of the present invention preferably has a linear crease at the boundary between the belt-shaped main body portion and the convex portion. This allows the belt-shaped main body portion to be aligned with the side edge of the cardboard board using the crease as a guide when applying the tape to the cardboard board, thereby enabling accurate application of the cardboard protective tape. Furthermore, the cardboard protective tape can be easily applied to the front and back surfaces of the cardboard board by simply folding the multiple convex portions along the crease. Examples of creases include linear grooves formed at the boundary between the belt-shaped main body portion and the convex portion, and continuous small holes (perforations) formed at the boundary between the belt-shaped main body portion and the convex portion. The linear grooves can be formed in the substrate. The perforations can be formed so as to penetrate the cardboard protective tape, or can be formed only in the substrate.

The thickness of the cardboard protective tape is not particularly limited, but is, for example, approximately 0.01 to 1 mm, preferably approximately 0.05 to 0.5 mm, more preferably approximately 0.08 to 0.3 mm, and even more preferably approximately 0.1 to 0.2 mm.

Next, a description will be given of a protected corrugated board provided with the above-described protective tape for corrugated board of the present invention.
The corrugated board of the present invention is characterized in that the protective tape for corrugated board is applied to the side of the board, including the side where the core is exposed. This eliminates sharp edges on the cut surface of the corrugated board, preventing hand cuts caused by the side of the board, resulting in a safe product. Furthermore, since the side of the board, which is the cut surface, is covered, the board has an excellent aesthetic appearance. It also has high airtightness and high thermal insulation properties.

The method for producing a protected corrugated board of the present invention is characterized in that the above-described protective tape for corrugated board of the present invention is applied to the side of a corrugated board, including the side where the core is exposed.
Specifically, for example, the width of the strip-shaped main body of the cardboard protective tape is adjusted and applied to the side of the cardboard board, and the convex portion of the cardboard protective tape is then folded over and applied to the front and back sides of the cardboard board. Furthermore, when applying the cardboard protective tape to the cardboard board, it is preferable to apply the cardboard protective tape to the side of the cardboard board while heating it. This prevents gaps from forming between the cardboard board and the cardboard protective tape, allowing for a cleaner and stronger application. Examples of heating methods include heating the cardboard protective tape temporarily applied to the cardboard board from the surface using a heater such as a handheld iron. The heating temperature is not particularly limited as long as it does not deform the cardboard board or cardboard protective tape, and is, for example, approximately 80 to 240°C, preferably approximately 100 to 220°C, more preferably approximately 120 to 200°C, even more preferably approximately 150 to 180 mm, and particularly preferably approximately 170°C.

The following describes in detail embodiments of the cardboard protective tape of the present invention using the drawings, but the present invention is not limited to these embodiments.

Here, Figure 1 is an explanatory diagram of a cardboard protective tape according to a first embodiment of the present invention. Figure 2 is a photograph of a protected cardboard board according to the first embodiment, equipped with the cardboard protective tape shown in Figure 1. Figure 3 is a photograph of a protected cardboard board according to a second embodiment, equipped with the cardboard protective tape shown in Figure 1. Note that the drawings referenced in the embodiments are schematic drawings to facilitate understanding, and the dimensional ratios of objects depicted in the drawings may differ from the dimensional ratios of actual objects.

As shown in Figure 1, the cardboard protective tape 10 according to the first embodiment of the present invention comprises a central strip-shaped main body 12 formed in a long strip shape, and a plurality of protrusions 14 provided on both sides of the strip-shaped main body 12. The cardboard protective tape 10 has a rubber-based adhesive applied to one side of a base material made of kraft paper, and is approximately 0.1 mm thick.

The band-shaped main body portion 12 is approximately 15 mm in width and length.

The protrusions 14 are mountain-shaped protrusions that protrude from both sides of the band-shaped main body 12 and are approximately 7 mm high. These protrusions 14 are provided continuously in the lengthwise direction and are formed in a wavy pattern that undulates at regular intervals (a pitch of approximately 18 mm).

Linear perforations 16 are provided at the boundary between the strip-shaped main body 12 and the protruding portions 14. Using these perforations 16 as a guide, the strip-shaped main body 12 can be aligned with the edge of the side of the cardboard, allowing for accurate application. Furthermore, by simply bending the multiple protruding portions 14 along the perforations 16, the tape can be easily applied to the front and back surfaces of the cardboard. (See Figure 2)

Next, we will explain the protective cardboard board according to the first embodiment, which is equipped with the above-mentioned cardboard protective tape.

As shown in Figure 2, the protective corrugated board 18 according to the first embodiment comprises a rectangular corrugated board 20 with notches formed in the four corners, and the above-mentioned protective tape for corrugated board 10 attached to the side, including the side surface 22 where the core of the corrugated board 20 is exposed. The protective corrugated board 18 has the strip-shaped main body 12 of the protective tape for corrugated board 10 attached to its side, and multiple folded protrusions 14 attached to the periphery of its front and back surfaces.

In Figure 2, for ease of understanding the areas where the cardboard plate 20 and cardboard protective tape 10 are attached, the protective cardboard plate 18 has an exposed area 22 on its side where the cardboard protective tape 10 is not attached. As shown in the exposed area 22, the cardboard protective tape 10 is attached to the side (cut surface) of the cardboard plate 20. The cardboard plate 20 has a three-ply reinforced cardboard plate structure with a thickness of 15 mm and three layers of A-flute.

The protective cardboard sheet 18 is applied neatly and accurately because the belt-shaped main body 12 is aligned with the edge of the side of the cardboard sheet 20, using the perforations 16 of the cardboard protective tape 10 as a guide. Furthermore, the multiple protrusions 14 on both sides of the belt-shaped main body 12 are arranged continuously along the length and are formed in a wavy pattern that undulates at regular intervals, giving it an aesthetically pleasing appearance. When folded at the corners, there is little overlap between adjacent protrusions 14, ensuring a neat application.

Next, we will explain the second embodiment of a protective cardboard board equipped with the above-mentioned cardboard protective tape.

As shown in Figure 3, the protective corrugated board 24 according to the second embodiment comprises a square corrugated board 28 having a circular hole 26 in its center, and the above-mentioned cardboard protective tape 10 attached along the side (inner peripheral portion) of the cardboard board 28, including the side (inner peripheral side) where the core of the hole 26 is visible. The protective corrugated board 24 is a 15 mm thick, three-ply reinforced corrugated board with three A-flute layers. The strip-shaped main body 12 of the cardboard protective tape 10 is attached to the inner peripheral side of the central hole 26, and multiple folded protrusions 14 are attached to the front and back surfaces of the inner peripheral side.

The protective cardboard sheet 24 is attached neatly and accurately because the band-shaped main body 12 is aligned with the side of the cardboard sheet 24, using the perforations 16 of the cardboard protective tape 10 as a guide. Furthermore, the multiple protrusions 14 on both sides of the band-shaped main body 12 are arranged continuously along the length and are formed in a wavy pattern that undulates at regular intervals, giving it an aesthetically pleasing appearance. When the tape is bent at the curved section, there is little overlap between adjacent protrusions 14, resulting in a neat and tidy attachment.

The protective tape for corrugated cardboard of the present invention is industrially useful because it can be used as a protective tape to prevent corrugated cardboard from being torn by hand.

REFERENCE SIGNS LIST 10: Protective tape for corrugated cardboard 12: Belt-shaped main body 14: Convex portion 16: Perforation 18: Protective corrugated cardboard plate 20: Corrugated cardboard plate 22: Exposed portion 24: Protective corrugated cardboard plate 26: Hole portion 28: Corrugated cardboard plate

Claims (8)

A protective tape for corrugated board that is attached to the side of a corrugated board, including the side where the core of the board is exposed,
A belt-shaped main body portion is attached to the side surface of the cardboard board, and a plurality of protrusions are provided on both sides of the belt-shaped main body portion and attached to the front and back surfaces of the cardboard board ,
A protective tape for corrugated cardboard, characterized in that the width of the belt-shaped main body portion corresponds to the thickness of the side surface of the corrugated cardboard board . The cardboard protective tape of claim 1, characterized in that it has a linear fold at the boundary between the belt-shaped main body portion and the convex portion. 3. The protective tape for cardboard according to claim 1 , wherein the width of the belt-shaped main body is any one of 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, and 50 mm. The cardboard protective tape according to any one of claims 1 to 3 , characterized in that the plurality of protrusions provided on both sides of the belt-shaped main body are provided continuously in the tape length direction and are formed in a wavy pattern undulating at regular intervals. The protective tape for cardboard according to any one of claims 1 to 4 , wherein the height of the plurality of convex portions is 6 to 8 mm. A protective corrugated board, characterized in that the protective tape for corrugated board according to any one of claims 1 to 5 is stuck to a side portion of the corrugated board, including the side on which the core of the corrugated board is exposed. A method for producing a protected corrugated board, comprising applying the protective tape for corrugated board according to any one of claims 1 to 5 to a side of the corrugated board, including a side on which the core of the corrugated board is exposed. 8. The method for manufacturing a protective corrugated board according to claim 7 , wherein the protective tape for corrugated board is applied to the side of the corrugated board while being heated.