JPH0582422U - Fastening tape for diapers - Google Patents

Abstract

(57) [Summary] [Purpose] The present invention provides a fastening tape for a disposable diaper that can significantly improve the detection rate of defective products for the fastening tape for a disposable diaper. [Structure] The fastening tape 1 comprises a joining tape 2 and a peeling tape 3, one end of the joining tape 2 is folded back to form a tab 4, and an adhesive layer 5 is applied to one surface of the joining tape 2. A peeling tape 3 shorter than the bonding tape 2 is adhered to the pressure-sensitive adhesive layer 5, the pressure-sensitive adhesive layer 6 is formed on the other surface of the peeling tape 3, and the peeling tape 3 is colored to form the bonding tape 2. A color density difference is provided between the tabs 4 of the bonding tape 2 in the image analysis device by the color density difference.
Makes it easy to detect defective products in which the peeling tape 3 is wound.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diaper fastening tape for use, and more particularly, to a diaper fastening tape for which the defective state detection rate of the fastening tape can be greatly improved as compared with the conventional one.

[0002]

[Prior Art]

 As shown in FIG. 3 (partially cutaway view) and FIG. 4, the disposable diaper comprises a disposable diaper 31 in which an absorber 34 is sandwiched between a topsheet 32 and a backsheet 33. The diaper 31 is provided with fastening tapes 35 for joining to both waist ends.

As shown in FIG. 5, the structure of the fastening tape 35 is composed of a joining tape 37 having an adhesive layer 36 and a peeling tape 38, and generally, this joining tape 37 has one end a of the back of the diaper 31. It is fixed to the back sheets 33 at both ends of the waistline of the side part, and the free end b of the other end is temporarily attached to the peeling tape 38, and the free end b of the joining tape 37 is peeled off when the tape is used. The diaper is fixed by being peeled off and pressed against the backsheets 33 at both ends of the waist on the front side to be used.

When the joining tape 37 is peeled from the peeling tape 38, a tab 39 is formed by bending the tip of the free end portion b of the joining tape 37 about 3 to 10 mm with the surface of the adhesive layer 36 inside so as to facilitate peeling. It is generally formed in.

The fastening tape is attached by the following steps. • Form a 3-10 mm folding tab with one end of the tie tape with the adhesive layer inside.・ Put a release tape shorter than the length of the bonding tape on the adhesive layer surface of the bonding tape.・ Cut the bonded bonding tape and peeling tape to the specified length (fastening tape length).・ Use one end (tabbed end) of the cut tape on the surface sheet of the diaper by using the adhesive side of the release tape, and bond with the part of the bonding tape protruding to the outside of the back sheet . -The part of the bonding tape that protrudes from the back sheet of the diaper is folded back to the back sheet side and bonded to the back sheet.

Since all of the above steps are performed at a high speed, in each step, a minute dimensional deviation or a tape drop may occur during the sticking step, resulting in defective products. In order to detect these defective products, after the completion of the product, workers perform intermittent visual inspections or automatic inspections using a continuous transmitted light image analysis device, etc. Changes in tape shape due to abnormal cutting are detected in advance, and the number of defective products shipped is greatly reduced.

[0007]

[Problems to be solved by the device]

 However, there are some defective states that are difficult to detect by the conventional detection method. For example, when forming the tab, as shown in FIG. 6, when the joining tape 37 wraps around one end of the peeling tape 38 to form the tab 40, when the joining tape 37 is peeled off, the peeling tape 38 is adhered. The top sheet 32 of the diaper 31 is destroyed. Further, when the tip of the joining tape is not folded, the adhesive surface of the joining tape directly adheres to the surface sheet and does not serve as the joining tape. In addition, if the bonding position of the bonding tape and the peeling tape is misaligned and the adhesive surface of the bonding tape protrudes between the tab of the bonding tape and the peeling tape, the adhesive surface of the bonding tape directly adheres to the surface sheet. Therefore, it does not play the role of the bonding tape.

In these defective states, since the tab cannot be seen through the binding tape, the tip of the binding tape is not properly folded when attached to the liquid-permeable top sheet and the liquid-impermeable back sheet. It is difficult to detect the positional deviation of the bonding between the bonding tape and the peeling tape by the conventional detecting means described above. SUMMARY OF THE INVENTION The present invention provides a fastening tape which can easily detect defective products of a diaper for use due to the fastening tape in order to improve the conventional defects.

[0009]

[Means for Solving the Problems]

 The present invention relates to a disposable diaper having an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet, wherein the fastening tape has a base material coated with a pressure-sensitive adhesive and a part of the tip is folded back. The adhesive tape is coated with a pressure-sensitive adhesive on the base material, the ends of the folded portions of the adhesive tape are aligned, and a release tape shorter than the adhesive tape is attached. Thus, the fastening tape for a disposable diaper is provided with a color density difference between the binding tape side and the peeling tape side.

[0010]

[Action]

 The present invention is configured as described above, and when detecting defective fastener tapes, a position where the defective surface of the fastener tape can be directly irradiated with reflected light in the process before attaching the fastener tape to the diaper. A reflection type image analysis device is installed in.

Further, in order to ensure that the binding tape or the peeling tape of the fastening tape can be checked, whether or not a coloring agent is added to the base material of the binding tape or the pressure-sensitive adhesive applied to the base material for coloring. Alternatively, a coloring agent may be added to the base material of the release tape or the pressure-sensitive adhesive applied to the base material to color the release tape, thereby providing a color density difference between the binding tape and the release tape. Defective products can be easily detected by measuring the amount of reflected light with a reflective image analyzer.

That is, at the position before using the fastening tape and attaching it to the diaper, the color density of the reflected light caused by the positional deviation of the peeling tape, the defective folding back of the leading end of the bonding tape, etc. depending on the amount of the reflected light hitting the peeling tape side. Differences in changes can be clearly detected, and defective fastening tapes can be reliably eliminated.

As the disposable diaper of the present invention, a conventionally known one can be used. The material of the joining tape of the fastening tape and the material of the peeling tape are generally polypropylene films, but polyethylene films or other materials may be used. For coloring these tapes, a predetermined amount of colorant is kneaded into the film, thin printing is performed, or a predetermined amount of colorant is added to the adhesive.

Coloring the release tape is effective for detecting defects in the tape. In that case, copper phthalocyan (blue, blue green), diazocadmium yellow (yellow) or the like is desirable as an example of the colorant. The colorant can be used in both the base material of the release tape and the pressure-sensitive adhesive layer, and the compounding amount at that time is about 1% to 5%.

[0015]

【Example】

 FIG. 1 shows an example of a normal product of the present invention. Next, the configuration and operation of the present invention will be specifically described with reference to the drawings. As shown in FIG. 1, the fastening tape 1 comprises a joining tape 2 and a peeling tape 3. One end of the joining tape 2 is folded back to form a tab 4, and an adhesive layer 5 is applied to one surface (the lower side in FIG. 1) of the joining tape 2.

A release tape 3 shorter than the bonding tape 2 is adhered to the adhesive layer 5, and an adhesive layer 6 is formed on the other surface of the release tape 3 and the release tape 3 Group 3 is colored blue-green by incorporating a colorant of copper phthalocyanine.

FIG. 2 shows a method of detecting the fastening tape 1. The light radiated through the strobe S is radiated to the fastening tape 1 and the reflected light is received by the camera K, and the image is displayed. The image analyzer G determines whether the fastening tape 1 is defective. The length L ₁ of the colored peeling tape of the normal product, based on the release tape 3, when the reference length L ₁ shorter than L _2, is determined as a defective product.

In this case, since the peeling tape 3 is colored, the image analyzer G can easily and surely determine the length of the peeling tape 3. In this case, even if the peeling tape 3 itself is not colored and the adhesive 6 of the peeling tape 3 is colored, the determination by the image analysis apparatus G is exactly the same.

[0019]

[Effect of the device]

 As described above, according to the present invention, by providing a color density difference between the joining tape and the peeling tape of the fastening tape, it is possible to prevent the fastening tape from being unbonded due to a poor bonding between the joining tape and the peeling tape, which has been difficult to detect in the past. Good products can be detected easily, quickly and efficiently.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a normal product of the present invention.

FIG. 2 is an explanatory diagram of an inspection method.

FIG. 3 is a schematic plan view of a used diaper.

FIG. 4 is a schematic enlarged plan view of a fastening tape portion of a diaper that is being used.

5 is a schematic cross-sectional view taken along line XX in FIG. 4 of a normal fastening tape product.

FIG. 6 is a schematic cross-sectional view taken along line XX in FIG. 4 of a defective fastening tape.

[Explanation of symbols]

 1: Fastening tape 2: Bonding tape 3: Release tape 4: Tab 5, 6: Adhesive layer G: Image analysis device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fukuhito Matsumoto 1-10-6 Shinonome, Koto-ku, Tokyo Oji Paper Co., Ltd. Research Center

Claims (1)

[Scope of utility model registration request] 1. A fastening tape for use in a disposable diaper having an absorbent body between a liquid-permeable top sheet and a liquid-impermeable back sheet, the fastening tape having a base material coated with a pressure-sensitive adhesive, A part of the binding tape is folded, and a pressure-sensitive adhesive is applied to the base material, and a peeling tape shorter than the binding tape is attached to the binding tape so that the ends of the folded portions are aligned. A fastening tape for a disposable diaper, characterized in that it is colored and a color density difference is provided between the binding tape side and the peeling tape side.