JPH10130592A - Extendable adhesive tape for fastening - Google Patents

Abstract

(57) [Problem] To provide an adhesive tape for fastening for disposable diapers. SOLUTION: A fixing portion fixed to a first portion of an adherend by an adhesive layer, and at least one fixing member extending integrally from the fixing portion in a longitudinal direction and a transverse direction thereof. Slits for tape separation are provided and in the vicinity of those slits the back surface of the tape substrate is not provided with an adhesive or is subjected to a non-adhesive treatment,
Then, when the tape is separated along the slit, the tape is developed to a length greater than the initial length of the tape, and the tape is composed of a developed portion that can be fixed to the second portion of the adherend by the adhesive layer. Configure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive tape for fastening, and more particularly, when applied to disposable diapers, does not become bulky. The present invention relates to an adhesive tape for fastening that can sometimes be compactly assembled.

[0002]

2. Description of the Related Art An adhesive tape for fastening is usually used for fastening two adherends or for fastening two separated parts in one adherend. The length of the adhesive tape used generally needs to be equal to or longer than the distance between two adherends or parts to be fastened. That is, the adhesive tape for fastening is provided and used in various lengths depending on the use. For example, in the case of a disposable diaper fastening adhesive tape, a longer fastening adhesive tape is used because when discarding the waste, it is necessary to wrap the waste inside and collect the waste compactly and securely. . However, since there is a restriction on the tape attachment portion of the disposable diaper, it is desirable that the adhesive tape used is as short as possible.

[0003] In order to solve the problem of the tape attaching portion, it has been proposed to use the fastening adhesive tape in a folded state. For example, pants-type disposable diapers 2
At 0, as shown in FIG. 1, the fastening adhesive tape 21 is stuck to the back sheet of the pants in a folded state, is left as it is during wearing, and after use, as shown in FIG. Then, an unfolded adhesive tape 21 is wound around the outer periphery of the rolled-up disposable diaper 20 and fixed.

There are various types of foldable adhesive tapes for fastening. For example, the applicant has disclosed in
No. 117607 discloses a composite laminated adhesive tape wound endlessly in a roll form. As shown in FIG. 3, the adhesive tape is composed of a central second tape 32 and first and second tapes 31 and 33 for fastening, and each tape is at least partially provided with a feeling. They are joined by pressure adhesives 34 and 35. This adhesive tape can be manufactured efficiently and stably in the form of a roll, and since the main tapes 31, 32, and 33 constituting the adhesive tape are folded back into a zet (Z) shape, the end of the disposable diaper 30 can be formed. When used for fastening a diaper, it does not occupy a large area for attachment, and because it is long enough to extend, it is possible to efficiently fix a rounded diaper after use. it can.

Japanese Utility Model Publication No. Hei 8-10305 discloses a tape fastener for disposable diapers. As shown in FIG. 4, the tape fastener has a three-fold structure including three layers of a fixing part 41, a fastening part 42, and an intermediate part 43, and further has a knob 44. This tape fastener is in a folded state before use, but when used, the knob 44 is pulled up as indicated by an arrow in the drawing, and the entire tape is stretched. Use of this tape fastener not only facilitates disposal of the diaper, but also has the effect of not impairing the appearance during wearing.

[0006] The folding adhesive tape as described above still has problems that need to be solved. For example, there is a problem of the thickness when the tape is folded. Although disposable diapers tend to be compact every year, when the thickness of the fastening tape is large and bulky, the tape protrudes from the surface of the back sheet of the diaper, making it difficult to handle when packaging the product, In addition, when the diaper is worn, the tape is prominently protruding, so that an infant or the like may peel it off. In addition, as the distance between the two adherends or parts to be fastened becomes longer, the problems of an increase in the area of the tape attachment part and an increase in the bulk of the tape become more prominent. Furthermore, if the bulk of the tape is remarkable, the problem of discomfort given to the wearer of the diaper, for example, a foreign object feeling,
Discomfort cannot be ignored.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional adhesive tape for fastening, and is suitable for disposable diapers. It is an object of the present invention to provide an adhesive tape for fastening that does not cause discomfort and that can be compactly collected at the time of diaper disposal.

[0008]

According to the present invention, the above-mentioned object is for fastening first and second separated parts of an adherend, and comprises: a rectangular base; A pressure-sensitive adhesive tape comprising a pressure-sensitive adhesive layer made of a pressure-sensitive adhesive applied to at least a part of the back surface of the base material,
The pressure-sensitive adhesive tape has a fixing portion fixed to the first portion of the adherend by the pressure-sensitive adhesive layer, and integrally extends from the fixing portion, and each of the fixing portion extends in a longitudinal direction and a transverse direction thereof. At least one tape separating slit is provided, and in the vicinity of those slits, the back surface of the base material is not provided with an adhesive or is subjected to a non-adhesive treatment. And when the tape is separated, the tape is developed to a length greater than the initial length of the tape, and a development portion that can be fixed to the second portion of the adherend by the adhesive layer. This can be achieved by an extendable fastening adhesive tape.

The fastening pressure-sensitive adhesive tape of the present invention has no irregularities unlike the conventional adhesive tape, and does not have the hardness or rough feeling caused by the presence of the bent portion unlike the conventional adhesive tape. When used as a pressure-sensitive adhesive tape for use, it does not give the wearer an unpleasant sensation, such as a foreign body sensation or a sense of discomfort. Further, the adhesive tape for fastening of the present invention is soft, thin, flat, and not bulky due to its configuration and material, so that a good feeling of use can be given to the wearer. . And when a used diaper is discarded, it can be disposed after being compactly collected.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The adhesive tape for fastening according to the present invention can be embodied in various forms. Hereinafter, preferred embodiments of the present invention will be described. The fastening adhesive tape of the present invention is used to fasten first and second separated parts of an adherend. Here, the adherend is not particularly limited, but is preferably a disposable diaper, particularly a pants-type disposable diaper. Further, although the adhesive tape for fastening of the present invention can usually be advantageously used to fasten two distant parts of one adherend, the fastening mechanism is basically the same, If necessary, it can also be used for fastening two separate adherends.

In the practice of the present invention, the rectangular base material of the pressure-sensitive adhesive tape may be any one commonly used in this technical field. Suitable substrates include, for example, films of synthetic resins such as polyolefins such as polyethylene and polypropylene, polyesters, polyamides, polyurethanes, and polyvinyl chloride. In some cases, a film or the like from a naturally occurring material may be used as the base material. These films are usually used in a single layer, but may be used in a laminated form as necessary. Further, in order to improve the adhesion of the pressure-sensitive adhesive layer, the surface of the base film may be subjected to a primer treatment or the like. When the pressure-sensitive adhesive tape of the present invention is used for fastening a diaper, a stress such as bending and pulling is applied when the tape is deployed. Therefore, it is preferable to use a flexible and high-tear strength substrate. Particularly preferred examples of the base material include a film formed of a blend of polypropylene and polyethylene or a block copolymer thereof. As described above, the shape of the substrate is preferably rectangular, and may be square or rectangular. Although the appropriate size of the substrate is not particularly limited, it is usually about 10 to 4
0mm (width) x about 25-150mm (length) x about 10-15
0 μm (thickness).

On the back surface of the rectangular base material, an adhesive layer formed by applying an adhesive to a predetermined thickness over the entire surface or, if necessary, partially is applied. Here, as the pressure-sensitive adhesive used for forming the pressure-sensitive adhesive layer, a pressure-sensitive adhesive generally used in this technical field can be used as in the case of the above-described base material. Suitable adhesives include, for example, synthetic rubber-based adhesives, natural rubber-based adhesives, acrylic-based adhesives, silicone-based adhesives, and urethane-based adhesives. The thickness of the adhesive layer is usually about 5 to
100 μm, preferably about 10-60 μm
Range. In some cases, if necessary,
The pressure-sensitive adhesive layer may be partially formed on the surface of the substrate.

The fastening adhesive tape of the present invention can be divided into two continuous regions in terms of its function.
One region is a fixing portion for fixing the pressure-sensitive adhesive tape to the first portion of the adherend via the pressure-sensitive adhesive layer below the base material. Another area is an extension of the fixing part, and is a development part that plays a role in increasing the length of the adhesive tape. Although the ratio between the fixed portion and the developed portion of the adhesive tape can be widely changed depending on the desired effect, usually, as long as a good effect is obtained with respect to the fixation to the adherend, the fixed portion of the tape is narrowed. Then, it is preferable to expand the unfolded portion by that much to obtain a greater tape extension effect.

[0014] At least one tape separating slit is formed in the developed portion of the adhesive tape in each of the longitudinal direction and the transverse direction of the tape. The slit may be perforated or may be completely cut by punching or the like as long as the tape can be bisected by the force applied during tape separation. In addition, although the slit is usually preferably formed as a linear pattern, as described below, in consideration of the formation of the tab for picking, a curved pattern, a zigzag pattern, and other patterns are used. Is also good. The slit can also be circular in shape when it is located at the end of the adhesive tape to make it less likely to tear the adhesive tape. Further, the slit may penetrate not only the base material but also the release tape coated with the adhesive layer below the base material, if necessary. Furthermore, the slit in the longitudinal direction may protrude above the fixing part in order to supplement the fastening force of the fixing part.

[0015] Various combinations can be adopted for the slits formed in the developed portion of the adhesive tape as described below with reference to the accompanying drawings. Such slits are preferably x along the length of the adhesive tape.
X along the cross direction (x is an integer of 1 or more) or 2 along the longitudinal direction of the adhesive tape.
x and x along the transverse direction (x is an integer of 1 or more). In the specification of the present application, “the number of slits” means that even if one slit is orthogonal to another slit in the middle, it is divided into two slits.
It shall be counted as a book or more slits.

In the adhesive tape for fastening of the present invention, when the tape is separated along the slit formed as described above, the tape is developed to a length exceeding the initial length of the tape, and the second portion of the adherend is formed. It can be fixed to the site with an adhesive layer. Especially,
By selecting and using a fastening adhesive tape having an appropriate development length, the tape can be fixed in a form most suitable for the adherend.

In addition to the features described above, in the adhesive tape for fastening according to the present invention, it is preferable that the vicinity of the formed separation slit is non-adhesive. The non-tackiness imparting to the vicinity of the slit can be performed according to various methods, but preferably, the pressure-sensitive adhesive layer is omitted on the back surface of the base material without applying the adhesive, and the formed adhesive is preferably used. Applying a non-adhesive treatment to the layer, and others. As an appropriate non-adhesive treatment, for example, a masking film, for example, a film such as a PET film, an OPP film or the like is partially adhered to the adhesive layer, and a talc or an inorganic material such as an inorganic material is Partially spraying powder or the like can be mentioned. In this manner, by providing the non-adhesive portion particularly in the vicinity of the slit, the adhesive tape for fastening can be easily deployed. When a masking film is provided, the tear strength of the adhesive tape for fastening can be enhanced.

In the fastening pressure-sensitive adhesive tape of the present invention, it is preferable to provide a tab for gripping at the end of the deployed portion when the tape is deployed. The tab for picking can preferably be constituted by a masking film such as a PET film or an OPP film or by folding back the end of the adhesive tape. The tabs for picking may be colored as needed to facilitate identification.

The fastening adhesive tape of the present invention further comprises:
It is preferable to further coat a release tape on the pressure-sensitive adhesive layer at the time of development of the development part. The coating of the release tape can be carried out as is customary in the art. For example, a base tape to which a release agent such as a silicone-based, long-chain alkyl-based, or fluorine-based release agent has been applied can be used as a release tape, depending on the type of the adhesive used in the adhesive tape.

As described above, the fastening adhesive tape according to the present invention can be advantageously used when a disposable diaper is used for an adherend. The disposable diaper used here is not particularly limited, but is preferably the pants-type disposable diaper described above with reference to FIG. Such a disposable diaper is usually composed of an interior sheet made of a liquid-absorbing interior material (for example, a nonwoven fabric) and a liquid-impermeable backsheet superposed outside so as to wrap the sheet. . Here, for the interior sheet, a commonly used liquid-absorbing material, for example, a nonwoven fabric such as polypropylene, polyethylene, or polyester can be used. For the back sheet, for example, a liquid impermeable material commonly used in disposable diapers, for example, a normal polyethylene film,
A porous polyethylene film or the like can be used.

[0021]

Next, preferred embodiments of the present invention will be described. The materials, sizes, and the like of the elements constituting each of the fastening adhesive tapes are in accordance with the above description, except where otherwise noted. In addition, in order to facilitate understanding, in FIGS. 5 to 16, the same components are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 5 is a plan view showing a preferred embodiment of the fastening adhesive tape according to the present invention. As shown in FIG. 5B, the fastening adhesive tape 11 of the present invention masks the base material 1, the adhesive layer 2 applied to the entire bottom surface thereof, and a part of the adhesive layer 2. Masking film 3
And a part of the base material 1 excluding the fixed part I, that is, the release tape 4 covered with the developed part II. A tab 5 for picking is formed at the end of the substrate 1. The masking film 3 is arranged in a predetermined pattern as shown in the figure for separating the tape in the slit and forming the tab. Attachment of the adhesive tape 11 to the disposable diaper 20 is performed using the fixing portion I of the adhesive tape 11.
The exposed portion 2a of the pressure-sensitive adhesive layer can be brought into close contact with the diaper 20.

When the used adhesive diaper is rolled up and discarded, the adhesive tape for fastening 11 of the present invention can be used to develop the tape.
, The diaper can be wound tight enough to make it compact. Specifically, the pressure-sensitive adhesive tape 11 can be developed by sequentially lifting the tape pieces along slits formed in the tape in the longitudinal direction and the transverse direction after the tab 5 for pulling is lifted.
In the case of the illustrated example, the order in which the formed slits are separated is b4-b2-a1-b1-a2-a3-b3-a4.
It is. The strength and tackiness of the pressure-sensitive adhesive tape after being stretched in this way are comparable to those before stretching.

The fastening adhesive tape according to the present invention may be configured as shown in FIG. In the case of the illustrated example, the slit b1-a1 /
The adhesive tape 11 can be separated in the order of a2. As shown in FIG. 6C, the adhesive tape 11 can be developed. In the case of the illustrated example, a part of the pressure-sensitive adhesive layer 2 is turned upside down and is exposed on the surface. However, the exposed adhesive layer 2 does not hinder the handling of the tape.

FIG. 7 is a modified example of the fastening adhesive tape shown in FIG. In this example, the shape of the tab for knob was changed from a rectangle to a rounded tip. The ease of picking has been improved over the tab of FIG. The fastening pressure-sensitive adhesive tape according to the present invention can be further simplified in its structure, for example, as shown in FIG. In the case of the illustrated example, after the slit b1 is separated and the tab 5 for picking up is lifted, the slit a
The adhesive tape 11 can be developed simply by separating the adhesive tape 11.

The pressure-sensitive adhesive tape for fastening according to the present invention can have various configurations in consideration of various factors such as a desired tape developing effect and a tape-attached portion. The appropriate configuration of the fastening pressure-sensitive adhesive tape of the present invention is not limited to the configuration shown below, but may have the configuration shown in FIGS. 9 to 16, for example. The fastening adhesive tape of FIG. 9 is an example in which two sets of slits are combined. After lifting the tab 5 for gripping, the adhesive tape 11 can be developed by separating the slits for separation in the order of b1-a1 / a2-b2-a3 / a4.

The fastening adhesive tape of FIG. 10 further extends the developed length of the fastening adhesive tape of FIG.
In this adhesive tape for fastening, the tab 5 for knob is set to b1-a
After pulling up in the order of 1 / a2, the separation slit is set to b2
By separating in the order of / b3-a3 / a4-a5 / a6-a7 / a8, the adhesive tape 11 can be developed.

The fastening adhesive tape of FIG. 11 further extends the developed length of the fastening adhesive tape of FIG. In this adhesive tape for fastening, after the tab 5 for picking is pulled up, the slit for separation is set to b1-a1 / a2-a3.
By separating in the order of / a4─b2 / b3-a5 / a6, the adhesive tape 11 can be developed. FIG.
In the fastening pressure-sensitive adhesive tape of (1), after the tab 5 for pulling is pulled up, the slit for separation is set to a1 / a2-b1-a3 / a4.
, The adhesive tape 11 can be developed.

Further, in the fastening adhesive tape shown in FIG. 13, after the tab 5 for pulling is pulled up, the slit for separation is set to a1.
By separating in the order of -b1-a2, the adhesive tape 1
1 can be deployed. Further, in the fastening adhesive tape of FIG. 14, after the tab 5 for pulling is pulled up, the slit for separation is b1-a1-a2-b2-a3-b3-a.
By separating in the order of 4-b4, the adhesive tape 11 can be developed.

Further, in the fastening adhesive tape shown in FIG. 15, after the tab 5 is pulled up, the separating slits are separated in the order of b1-a1-a2-b2-a3 so that the adhesive tape 11 is separated. Can be expanded. Then, in the fastening adhesive tape of FIG. 16, after the tab 5 for pulling is pulled up, the slit for separation is set to b1 / b2-a1 /.
By separating in the order of a2-b3-a3 / a4, the adhesive tape 11 can be developed.

[0031]

As described above, according to the present invention, when it is used as an adhesive tape for fastening disposable diapers, it does not become bulky and gives the wearer a feeling of foreign matter.
It does not cause discomfort such as discomfort, and when used diapers are discarded, they can be compacted and then discarded.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example in which a conventional adhesive tape for fastening is used for a pants-type disposable diaper.

FIG. 2 is a perspective view showing an example in which the fastening adhesive tape shown in FIG. 1 is used at the time of disposal of a diaper.

FIG. 3 is a cross-sectional view showing an example of a conventional composite laminated adhesive tape for diapers.

FIG. 4 is a perspective view showing an example of a conventional tape fastener for disposable diapers.

FIG. 5 is a plan view and a cross-sectional view showing a preferred example of the fastening adhesive tape according to the present invention.

FIG. 6 is a plan view and a sectional view showing another preferred example of the fastening adhesive tape according to the present invention before and after use.

FIG. 7 is a plan view showing a modified example of the adhesive tape for fastening shown in FIG. 6 before and after use.

FIG. 8 is a plan view and a sectional view before and after use showing another preferred example of the fastening adhesive tape according to the present invention.

FIG. 9 is a plan view and a sectional view showing another preferred example of the fastening adhesive tape according to the present invention.

FIG. 10 is a plan view and a sectional view showing still another preferred example of the adhesive tape for fastening according to the present invention.

FIG. 11 is a plan view and a sectional view showing still another preferred example of the fastening adhesive tape according to the present invention.

FIG. 12 is a plan view and a sectional view showing still another preferred example of the fastening adhesive tape according to the present invention.

FIG. 13 is a plan view and a sectional view showing still another preferred example of the fastening adhesive tape according to the present invention.

FIG. 14 is a plan view and a sectional view showing still another preferred example of the fastening adhesive tape according to the present invention.

FIG. 15 is a plan view and a sectional view showing still another preferred example of the adhesive tape for fastening according to the present invention.

FIG. 16 is a plan view and a sectional view showing still another preferred example of the fastening adhesive tape according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Adhesive layer 3 ... Masking film 4 ... Peeling tape 5 ... Tab for tab 11 ... Adhesive tape 20 ... Pants type disposable diaper I ... Fixed part II ... Deployment part a1 ... Longitudinal slit b1 … Transverse slit

Claims (7)

[Claims] 1. A rectangular base material and an adhesive applied to at least a part of a back surface of the base material for fastening first and second separated portions of an adherend. A pressure-sensitive adhesive tape for fastening comprising a pressure-sensitive adhesive layer made of an adhesive, wherein the pressure-sensitive adhesive tape is fixed to a first portion of the adherend by the pressure-sensitive adhesive layer, and integrally formed from the fixed portion. And at least one tape separating slit is provided in each of the longitudinal direction and the transverse direction, and no adhesive is applied to the back surface of the base material in the vicinity of these slits. Or a non-adhesive treatment is applied, and when the tape is separated along the slit, the tape is developed to a length exceeding the initial length of the tape, and the tape is spread on a second portion of the adherend. Development that can be fixed with an adhesive layer And an extendable adhesive tape for fastening, comprising: 2. The adhesive tape for fastening according to claim 1, wherein a tab for knob is provided at an end of the unfolded portion when the unfolded portion is unfolded. 3. The fastening adhesive tape according to claim 1, wherein a masking film is adhered to the adhesive layer for the non-adhesive treatment. 4. The method according to claim 1, wherein the slit has x slits along the longitudinal direction of the adhesive tape and x slits (x is 1) along the transverse direction.
The above integer is an integer).
4. The adhesive tape for fastening according to any one of items 3 to 5. 5. The adhesive tape has 2x slits along the longitudinal direction and x slits along the transverse direction (x is
2. An integer greater than or equal to 1).
The adhesive tape for fastening according to any one of claims 3 to 3. 6. The pressure-sensitive adhesive tape according to claim 1, wherein a release tape is coated on the pressure-sensitive adhesive layer of the development portion. 7. The diaper according to claim 1, wherein the adherend is a disposable diaper, and is used to fasten the two separate parts when the diaper is discarded.
The adhesive tape for fastening according to any one of claims 6 to 6.