JPH11309172A - Release film for protecting adhesive layer for securing sanitary article to underwear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a release film which hardly makes sound during the opening of a sanitary article and has no fear of rubbing against an individual packing film and causing the sound of friction even if an individual packing bag is rolled and dumped in a trash can, and which ensures that adhesive layers can be inspected for any formation errors by sensing, during the manufacturing process of the sanitary article, the release films each having an adhesive layer on the surface of a back seat, and detecting defectives which have no adhesive layers and those in which the positions of the adhesive layers have been shifted. SOLUTION: A release film is obtained by performing a releasing process on at least one side of a polyolefin resin film containing a fluorescent material. The use of the release film 4 enables an adhesive layer 3 to be inspected for formation errors by detecting fluorescence produced by application of light to a sanitary article from its side on which the release film 4 was deposited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release film used for protecting a pressure-sensitive adhesive layer for fixing sanitary goods such as napkins and disposable diapers to underwear and the like.

[0002]

2. Description of the Related Art An adhesive layer is provided on the back of an absorbent body for sanitary napkins for fixing it to underwear or the like, and this adhesive layer is released by a release paper so as not to adhere to an individual wrapping film or the like until use. Is protected. This release paper is conventionally made of paper, and there is a known sanitary napkin packaged using paper release paper (JP-A-8-22).
No. 4269).

[0003] However, in the individual wrapping bag using the release paper made of paper, a sharp noise peculiar to the paper is generated when the bag is opened. Also, when the individual wrapping bags of sanitary napkins are rolled and discarded in a trash can, the paper release paper rubs against the individual wrapping bags to produce the above-mentioned noise, and this packaged product also lacks comfort during use.

In the process of manufacturing a sanitary product, an adhesive is applied to the release surface of the release film to form an adhesive layer.
The surface of the adhesive layer is stuck on the back sheet surface of the sanitary product body, but when the release film with the adhesive layer is overlaid on the back sheet surface, the position of the release film cannot be detected by the photoelectric tube, so that the adhesive Defective products without layers,
Even if a defective product with a misalignment of the adhesive layer occurred, it could not be detected.

[0005]

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to make it difficult for a sound to be generated when a sanitary ware is opened, and to rub a personal wrapping film when a personal wrapping bag is rolled and discarded in a trash can. An object of the present invention is to provide a release film for protecting an adhesive layer, which does not cause friction noise, and an individual package of sanitary articles using the same.

Another object of the present invention is to detect a defective product without an adhesive layer or a defective product having a misaligned adhesive layer by detecting a release film with an adhesive layer on the back sheet surface in a sanitary article manufacturing process. Accordingly, an object of the present invention is to provide a release film capable of reliably inspecting the presence or absence of an adhesive layer formation defect.

[0007]

The release film for protecting an undergarment-fixing adhesive layer of a sanitary article according to the present invention is a release film obtained by releasing at least one surface of a polyolefin resin film containing a fluorescent substance. is there.

[0008] By using the release film having the above structure, the formation of the adhesive layer is inspected by detecting the fluorescence generated by irradiating light from the side where the release film of the sanitary ware is laminated. be able to.

The polyolefin resin constituting the base material of the release film for protecting the adhesive layer includes very low density polyethylene resin, low density polyethylene resin, linear low density polyethylene resin, high density polyethylene resin, polypropylene -Based resin, polypropylene alloy alloy, ethylene-propylene rubber, ethylene-methyl methacrylate copolymer, ethylene-vinyl acetate copolymer,
Examples thereof include an ethylene-acrylic acid copolymer and an ethylene-methacrylic acid copolymer. These resins may be used alone or in a blend. The release film may be a single-layer body made of these resins, or a multi-layer body formed by combining the single-layer bodies.

[0010] It is also preferable to apply a mat embossing at the time of film formation, whereby the feeling and mechanical suitability can be improved. The formation of the base film can be performed by a usual method such as a T-die method, an inflation method and the like.

In addition, the appearance of the base material of the release film can be improved by coloring the surface of the base material which has not been subjected to the release processing for decoration.

The basis weight of the substrate of the release film is preferably 1
5 to 80 g / m ² , more preferably 25 to 45 g / m ²
It is. If the basis weight is less than 15 g / m ^2, it is difficult to secure the strength. If the basis weight is more than 80 g / m ² , the strength and the waist may be too large, which may cause rubbing noise between films.

[0013] At least one surface of the release film substrate having the above structure is preferably subjected to a corona treatment, and then a release agent is applied to form a release layer.

The release agent may be heat-curable silicone, ultraviolet light,
A radiation-curable silicone such as an electron beam may be used, but a radiation-curable silicone having a small film deformation is desirable because there are many flexible films in terms of product characteristics. A release agent is often used in combination with a curing catalyst.

The coating amount of the release layer of the release film is preferably 0.05 to 1.5 g / m ² . This coating amount is 0.
05G / m is less than ² when uniform application is difficult and peeling of the release agent is hardly stable, curing of the release agent may become insufficient on uneconomical exceeds 1.5 g / m ² There is.

The release film according to the present invention comprises a polyolefin resin containing a fluorescent substance. The fluorescent substance to be used is not limited as long as it has a fluorescent property. A typical example of the fluorescent substance is an optical brightener. This absorbs the ultraviolet energy of sunlight or artificial light, reflects this energy to the violet to blue portion of the visible portion, increases the reflectance in this wavelength portion, and gives a vivid color tone. This action has the effect of removing the color tone of the slightly yellowish portion of the polymer substance. Transparent products have a bluish hue, while white products emphasize whiteness.

By utilizing this principle, in the process of manufacturing sanitary goods, fluorescence is generated from a release film containing a fluorescent whitening agent by a sensor that emits ultraviolet light, and this is sensed by the sensor, whereby the surface of the back sheet is detected. A release film with an adhesive layer can be detected. This makes it possible to detect a defective product without an adhesive layer or a defective product with a positional shift of the adhesive layer, and to inspect whether or not there is a defective adhesive layer formation.

As the fluorescent substance, "Hakko" manufactured by Bayer AG is used.
l ”,“ Uvite ”manufactured by Ciba Specialty Chemicals
x "and" Whitex "manufactured by Sumitomo Chemical Co., Ltd. are used.

As the fluorescent sensor, luminosity sensors LUT1-4 manufactured by Optec can be used.

The content of the fluorescent substance is about 10 to 25 ppm in the polyolefin resin when the basis weight of the release film substrate is 25 to 45 g / m ² . If the amount of the fluorescent substance is small, the fluorescence is not detected, and if it is too large, the detection limit may be exceeded.

[0021]

The release film according to the present invention is obtained by changing the base material of the release film from a paper-made one to a polyolefin-based resin film. Even when rolled and thrown into the trash can, there is no danger of rubbing with the individually wrapped film and producing friction noise.
Sanitary goods can be used comfortably.

Further, since the release film according to the present invention is made of a polyolefin resin containing a fluorescent substance, in the process of manufacturing sanitary goods, the fluorescent sensor detects the fluorescence emitted from the release film without detecting the individual packaging film. By doing so, a defective product without an adhesive layer or a defective product with a positional shift of the adhesive layer can be reliably detected.

[0023]

The present invention will be described below with reference to examples.

Example 1 80 parts by weight of a polypropylene resin ("FG464" manufactured by Nippon Polyolefin Co., Ltd.) and ethylene-propylene rubber ("Tuffmer P" manufactured by Mitsui Chemicals, Inc.)
-0280 ") 20 parts by weight and 0.0015 fluorescent whitening agent (" Uvitex "manufactured by Ciba Specialty Chemicals)
The basis weight of the resin composition obtained by mixing the parts 30 g / m ²
And extruded with a T-die to produce a film. Apply corona treatment to one side of the obtained film substrate,
Further, the non-treated surface was subjected to mat embossing for improving decorativeness and machine suitability.

A radiation-curable silicone release agent (“KS-550” manufactured by Shin-Etsu Chemical Co., Ltd.) is applied to the corona-treated surface of the base material.
8 ") 100 parts by weight and a curing catalyst" CAT-PL-50 "
00 "of a coating liquid obtained by mixing 5 parts by weight of a solid content of 0.2
g / m ² and dried. The formed release layer was irradiated with ultraviolet rays to obtain a release film.

An adhesive was applied to the release surface of the release film to form an adhesive layer, and a release film with an adhesive layer was obtained.

As shown in FIG. 1, commercially available sanitary napkins
1 on the back sheet 2
The adhesive layer 3 was affixed, a sanitary napkin was wrapped in a film for individual wrapping 6, and the film was sealed to produce an individual wrapping bag.

When the individual wrapping bag for sanitary napkin was opened and the individual wrapping bag including the release film was peeled off from the adhesive layer,
There was almost no sound associated with opening the individual packaging bag. Also, when the individual wrapping bag of sanitary napkin was rolled and discarded in a trash can, there was almost no friction noise between the release film and the individual wrapping bag.

In the napkin manufacturing process, the release film 4 with the adhesive layer 3 attached to the back sheet 2
Then, when ultraviolet light was irradiated from the fluorescent sensor 5, fluorescence emitted from the release film 4 could be detected. Therefore, this makes it possible to detect a defective product without an adhesive layer and a defective product with a positional shift of the adhesive layer.

Example 2 60 parts by weight of a low-density polyethylene resin ("Petrocene 173" manufactured by Tosoh Corporation), 40 parts by weight of a high-density polyethylene resin ("Nipolon Hard 6100A" manufactured by Tosoh Corporation), and a white pigment (Tokyo) 5 parts by weight of “PEX186004” manufactured by Ink Corporation and “UVITE” manufactured by Ciba Specialty Chemicals
X)) and extruding a resin composition obtained by mixing 0.0015 parts by weight with a T-die so as to have a basis weight of 30 g / m ² .
A film was produced. One surface of the obtained film substrate was subjected to a corona treatment, and further to a mat embossing treatment for improving decorativeness and machine suitability.

Thereafter, the same operation as in Example 1 was performed to obtain a release film, and the same evaluation was performed. As a result, the same evaluation result as that of the release film of Example 1 was obtained.

(Comparative Example 1) A release film was obtained in the same manner as in Example 2 except that no fluorescent brightener was used, and the release film was similarly evaluated.

When the individual wrapping bag was opened or when the individual wrapping bag was rolled and discarded in a trash can, there was almost no sound. However, the release film could not be detected by the fluorescent sensor in the napkin manufacturing process. .

[0034] (Comparative Example 2) glassine paper having a basis weight of 50 g / m ^2, heat-curable silicone release agent (the Shin-Etsu Chemical Co., Ltd. "KS-778" 100 parts by weight, a curing catalyst "CAT-
PL-8 "(5 parts by weight) was coated with a coating liquid having a solid content of 1.0 g / m ² and dried to obtain a release paper.

Evaluation was carried out in the same manner as in Example 1 except that this release paper was used in place of the release film. When the individual wrapping bags were opened, there was a noise that the paper rubbed.
When the individual wrapping bags were rolled and thrown into the trash, there was a sound of crushing the paper.

Table 1 shows the structures and evaluation results of the release films or release papers of the examples and comparative examples.

[0037]

[Table 1]

[0038]

According to the present invention, since the release film for protecting the adhesive layer of the sanitary article is made of a polyolefin resin,
Little or no sound is generated at the time of opening, and even when the individually wrapped bag is rolled and discarded in a trash can, it does not rub against the individually wrapped film to generate a frictional sound. Therefore, according to the present invention, it is possible to provide a personal hygiene article package that can be used comfortably without any care about the surroundings during use.

In addition, since the release film of the present invention contains a fluorescent substance, it is necessary to reliably detect the position of the release film with the adhesive layer on the back sheet surface and the presence or absence of the adhesive layer by a fluorescent sensor in the process of manufacturing a sanitary article. Can be. This makes it possible to detect a defective product without an adhesive layer or a defective product with a misalignment of the adhesive layer position, and to reliably inspect the presence or absence of a defective adhesive layer formation.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which a fluorescent sensor detects the position of a release film with an adhesive layer and the presence or absence of an adhesive layer on the backsheet surface of a sanitary article main body in the process of manufacturing the sanitary article.

[Explanation of symbols]

 1: sanitary napkin 2: back sheet 3: adhesive layer 4: release film 5: fluorescent sensor

Claims (3)

[Claims] 1. A release film for protecting an adhesive layer for fixing undergarments of sanitary goods, wherein at least one surface of a polyolefin resin film containing a fluorescent substance is subjected to a release treatment. 2. The release film piece according to claim 1, which is adhered and fixed to a substantially central portion of an individually wrapping film for individually wrapping the sanitary article body with the release surface facing outward, and is coated on the release surface. An individual package of sanitary goods, in which the provided pressure-sensitive adhesive layer is superimposed on the backsheet surface of the sanitary article main body, and the hygiene articles are wrapped around the individual packaging film. 3. The position of the release film and the formation of the pressure-sensitive adhesive by detecting the fluorescence generated by irradiating light from the side of the individual package according to claim 2 on which the release film is laminated. How to check for defects.