JPH0576569A - Article having target part for tacky adhesion and production thereof - Google Patents

Abstract

PURPOSE:To reduce the overall cost for forming target parts by drawing the marks indicting the tab sticking positions of the target parts with the coating patterns of a hot melt resin compsn. CONSTITUTION:A paper diaper 110 is formed with the target parts 102 by the hot melt resin compsn. applied like dots on the surface of a base material 101. Such diaper is produced by continuously supplying tissue paper from a roll and inserting a water absorbent material 3 between two sheets of the tissue paper. The hot melt resin compsn. 25 is applied from a cylindrical screw 260 rotating around its central axis by the required amt. each on a polyethylene (PE) film 20 supplied continuously from a roll 21 to form the target parts 102 on the surface on the outer side of the PE film 20. The target parts are obtd. from the fewer materials with the simple stage in this way and the cost reduction is attained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an article having an adhesive target portion such as a paper diaper and a method for producing the article.

[0002]

2. Description of the Related Art A typical example of an article having an adhesive target portion is a disposable diaper. The paper diaper has an adhesive fastening system for fixing the diaper when worn. This adhesive-type fastening system is composed of a tab having an adhesive surface and a target portion for detachably adhering the tab. The target portion is usually provided on the outer surface of the front side of the diaper. Tabs provided on both sides of the back side of the diaper can be adhered to or peeled from the target portion. That is, the disposable diaper is applied along the wearing site of the body, temporarily fixed by the fastening system, positioned and then fixedly used, and when the disposable diaper is removed, the fastening system is released. As described above, the target portion is particularly provided because the surface of the base material is not formed to be suitable for detachably adhering the tab, and other performances such as water impermeability and flexibility are not provided. This is because it is designed to satisfy the flexibility and texture.

Such a target portion is formed, for example, by sticking a resin sheet 202 on the surface of a base material 200 via an adhesive 201 as shown in FIG. The manufacturing method is as follows, for example. FIG. 13 schematically shows an example of a step of forming a target portion in the conventional method for manufacturing a disposable diaper. FIG.
As shown in Fig. 2, the stretched polypropylene film 27 is continuously supplied, and the coating gun 2 is applied to the entire back surface of the film 27.
The hot melt adhesive 28 is continuously applied from No. 9. This is cut into an appropriate size and attached to the outer surface of the polyethylene film 20 which is continuously supplied. As a result, the target portion is formed on the outer surface of the polyethylene film 20.

Alternatively, a pressure-sensitive adhesive tape having a release treatment applied to the front surface (of course, a release liner is attached to the back surface) is purchased, and the adhesive tape is attached to the outer surface of the polyethylene film to obtain a target. It may be part. On the other hand, when an article having a target portion is used many times, it is troublesome to repeatedly determine which position of the target portion the tab is to be attached to each time the article is attached. If there is a mark showing the tab pasting position,
After deciding the attachment position, the tab can be easily attached to the predetermined position by using the mark. Conventionally, such a mark has been printed on the surface of the resin sheet that is the target portion.

[0005]

In the above-mentioned prior art, the material cost for forming the target portion is high, and the process is complicated, resulting in a high overall cost. The inventors considered forming the target portion with a hot melt resin composition in order to reduce the material. In this case, printing the mark on the surface of the film of the hot-melt resin composition complicates the process.
Also, since the underlying substrate can be seen through the film of the hot melt resin composition, it may be possible to print the mark on the substrate surface, but it is possible to print only on the portion corresponding to the target portion of the substrate surface. It is difficult to do so, a mark is printed on the entire surface of the base material, and it is difficult to distinguish the target portion from the other portions.

Therefore, the present invention provides an article having an adhesive target portion which can reduce the overall cost for forming the target portion and which has a mark indicating the tab attachment position. Is an issue. Moreover, this invention makes it a subject to provide the manufacturing method which can manufacture such an article by a simple process.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention is directed to a target portion (adhesive target portion.
(Hereinafter simply referred to as "target portion"), and the target portion is formed of a hot-melt resin composition, and a mark indicating a tab attachment position of the target portion is applied with the hot-melt resin composition. An article characterized by being drawn in a pattern is provided.

Further, according to the present invention, the target portion is formed on the surface of the base material by directly applying the hot-melt resin composition as the target portion by screen coating on the surface of the base material which is continuously moving. Provided is a method for manufacturing the article. In screen coating,
Since a screen in which a desired pattern is drawn with a large number of small through holes is used and the hot melt resin composition is extruded through the through holes and applied with small dots, a part of the applied pattern serves as a mark indicating the tab attachment position. .. in this case,
The application pattern is an aggregate of dots, and various patterns can be drawn. In addition, by changing the pattern shape and / or the size of the dots in various ways, even if the adhesive strength of the pressure-sensitive adhesive of the tab is varied, the components and composition of the hot-melt resin composition are not changed at all and the attached tab is It is possible to adjust the peeling strength between and to be an appropriate size.

The hot melt resin composition used in the present invention is preferably one which satisfies all the following characteristics. The open time is short. The shorter the better, but
It is preferably 0.5 seconds or less. If it is longer than this range, the pressure-sensitive adhesive roll may have an adhesive. The surface energy of the solidified product is small. The surface energy is 15 to 25 dyne / c in terms of compatibility with the adhesive surface of the tab and the ease of peeling with it.
m ² is preferred. If it is larger than this range, the mold releasability is lost,
The tape may be difficult to separate, and if it is small, the tape may not stick.

Excellent adhesion to the substrate. Adhesiveness to the base material should be such that even if adhesion and peeling from the tab are repeated many times, peeling occurs at the interface between the tab and the target portion and peeling does not occur at the interface between the target portion and the base material. .. There is no blocking property. It is preferable that the blocking property does not occur that the target portion adheres to another object and is not peeled off from the time of being formed to the time of use. It is preferable that such a property that there is no blocking property is exhibited at a temperature of about 65 ° C. or lower.

There is no stringing. In screen coating (screen printing), the hot melt resin composition is extruded through small through holes, and thus it is preferable that the hot melt resin composition has low viscosity. This viscosity is empirically 2 at 110 ° C.
It is not more than 10,000 centipoise. If the viscosity is higher than this, stringing may occur and an accurate coating pattern may not be obtained.

The above hot-melt resin composition may be used in a usual hot-melt adhesive, and may be combined with a base resin, a pressure-sensitive resin, a wax, an oil, an antioxidant and the like in an appropriate ratio and blended in the above-mentioned items 1 to 3. Everything is prepared to your satisfaction. Examples of the base resin include ethylene-vinyl acetate copolymer (EVA), polystyrene-polybutadiene-polystyrene block copolymer (SBS), polystyrene-polyisoprene-polystyrene block copolymer (SIS), polystyrene-
Polyethylene / polybutylene-polystyrene block copolymer (SEBS), polystyrene-polyethylene / polyisoprene-polystyrene block copolymer (SEP)
One or more resins of thermoplastic resins such as S), polyolefin-based polymers, polyester-based polymers, acrylic-based polymers and polyurethane-based polymers are used.

The adhesive resin is, for example, one or more of aliphatic or alicyclic hydrocarbon resins, rosins and rosin derivatives, terpene resins, aromatic resins, coumarone indene resins and the like. Resin is used. As the wax, for example, one or more of paraffin wax, microcrystalline wax, polyethylene wax and the like are used.

The oil is, for example, one or two of paraffin oil and naphthene oil.
The above are used. The hot melt resin composition can be colored in a desired color by using an appropriate color pigment. In this way, the distinction from the base material becomes clearer, and the tab attachment position can be easily identified.

Of the above components, the base resin, adhesive resin, wax and oil are used in the following proportions, for example. 10 to 60 parts by weight of the base resin and 20 to 4 parts of the adhesive resin with respect to a total of 100 parts by weight of these four members.
0 parts by weight, wax 30 to 60 parts by weight, oil 0 to 15
Parts by weight. When an antioxidant is used, it is appropriate to use it in an amount of 1.0 part by weight or less based on 100 parts by weight, and when a coloring pigment is used, it is appropriate to use it in an amount of 1.0 part by weight or less. is there.

In order to adjust the viscosity of the hot melt resin composition used in the present invention at 110 ° C. to 20,000 centipoise or less and to satisfy all of the above-mentioned properties (1) to (4), for example, a base resin and an adhesive are used. The method of appropriately adjusting the type and amount of resin, wax, and oil added as necessary is adopted. Among them, the method of changing the type of base resin, especially the magnitude of melt index (MI) is the easiest. So it's preferable.

According to the present invention, since the target portion is formed of the hot melt resin composition, various performances can be imparted by properly designing the hot melt resin composition. For example, adjusting flexibility,
Reinforcement of the substrate, control of peeling force, etc. These properties are imparted by, for example, the addition amount of a rubber-based polymer,
It can be performed by using a high softening point resin or wax.

The hot melt resin composition prepared from the above components is directly applied to the surface of the substrate. This coating is performed using, for example, a screen coating device without using a normal hot melt coating gun or the like. The coating amount may be appropriately set according to the size of the target portion to be formed. The coating thickness may be the same as in the case of a normal hot melt adhesive, for example,
It is about 50 to 200 μm. Further, since the target portion is formed by applying the hot melt resin composition, the target portion can be easily formed even on the substrate that is continuously moving. Moreover, since there is no step for reducing the line speed such as cutting the adhesive tape, the line speed can be increased. Of course, it is not necessary to form the target portion while continuously moving it. As a base material for forming the target portion, a polyethylene film, an OPP (stretched polypropylene) film, or the like is used when a paper diaper is manufactured.

Articles produced by the present invention include:
Examples include, but are not limited to, disposable diapers and medical drapes. The term "tab" as used herein refers to an article having a target portion, or
It is a part provided on another article and having an adhesive surface for detachably adhering to the target part. For example, when a part of an adhesive tape-like material is adhered to an adherend and the other part is free without being adhered, the free part is called a tab. In addition,
When it is not necessary to exhibit tackiness, release paper may be attached to keep the tab tackiness. In this case, the release paper is peeled off and adhered to the target part.

[0020]

By forming the target portion with the hot melt resin composition, it is not necessary to use a resin sheet as the target portion, and the material cost is reduced. It is convenient to attach the tab if a mark indicating the tab attaching position is drawn on the target portion with a coating pattern of the hot melt resin composition. Moreover, it is not necessary to print such a mark on the substrate to which the hot melt resin composition is applied.

When the hot melt resin composition is applied directly to the substrate by screen coating, the step of supplying the resin sheet to be the target portion is not required and the steps are simplified. Moreover, the conventional continuous production line can be used.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments, but the present invention is not limited to the illustrated ones. FIG. 1 is a plan view showing an embodiment in which the article of the present invention is a disposable diaper, and FIG. 2 is a partial sectional view thereof. As shown in FIG. 1, the disposable diaper 110 is I-shaped and has a lower abdomen 110a having left and right wings extending in order from the top, a constricted crotch portion 110b in the center, and left and right wings extending below the crotch part 110b. It is a buttocks portion 110c having a. From the lower abdomen 110a to the buttocks 110c, a water absorbent material 3 sandwiched between two tissue papers is stored, and absorbs and holds urine and the like. Elastic bands 9 are arranged vertically on the left and right sides of the water absorbent material 3 of the crotch portion 110b so that a contracting force is exerted when the water absorbent material 3 is stretched in the longitudinal direction. The diaper 110 is designed to come into close contact with the wearer's thigh base. Tabs 103 are attached to the tips of both wings of the hip portion 110c. Lower abdomen 11
0a substrate (for example, polyethylene film) 1
On the surface of 01, the target portion 102 is formed of the hot melt resin composition as described above.

As shown in FIG. 2, this disposable diaper 110
The target portion 102 is formed of the hot-melt resin composition applied in a dot shape on the surface of the base material 101. Compared to the conventional target portion shown in FIG. Is becoming Such a disposable diaper 110 may be manufactured by a continuous manufacturing method or a discontinuous manufacturing method.
The target portion 102 is composed of an aggregate of dots of the hot melt resin composition.

In the present invention, when the hot melt resin composition is applied to form the target portion 102, a mark indicating the tab attachment position is drawn with this hot melt resin composition. 3 to 9 show pattern examples of the left and right target portions 102 formed so as to have such marks. When the disposable diaper 110 is worn, each A in FIGS. 3 to 9 comes to the right lower abdomen of the wearer, and each B comes to the left lower abdomen of the wearer. In FIGS. 3 to 9, tightening becomes stronger as the tab sticking position is closer to the center,
The closer it is to the outside, the looser it becomes. If the same person wears the same disposable diaper product many times, remember the mark at the optimum position once, and from the next time, the tab 103 at that mark.
It is easy to put it on if you attach and stop it.

FIG. 10 schematically shows an embodiment in which the method for producing an article of the present invention is a method for producing a disposable diaper. As shown in this figure, while the tissue paper 2 is continuously supplied from the roll 1, the tissue paper 32 is continuously supplied from the roll 31, and the water absorbing material 3 is supplied to
It is sandwiched between two tissue papers 2 and 32. A polyethylene film (which becomes a back sheet) 20 is continuously supplied from a roll 21, and as shown in FIG. 11, the polyethylene film 20 is rotated from a cylindrical screen 260 which is adapted to rotate around a central axis. A required amount of hot melt resin composition 25 is applied (shown by 24 in FIG. 10) to form a target portion (not shown) on the outer surface of the polyethylene film 20.

When the hot melt resin composition 25 for forming the target portion is put in the cylindrical screen 260 and the screen 260 is rotated, the hot melt resin composition 25 is obtained.
Is applied to the inner peripheral surface with a doctor blade 261 or the like, passes through the permeation holes to the outside, and is applied to the surface of the polyethylene film 20 as the base material. The coating pattern of the hot melt resin composition 25 at this time is, for example, as shown in FIG.
.About.9.

The cylindrical screen 260 is designed, for example, so that one round corresponds to a length of a positive integer multiple of the disposable diaper 110, and an arc-shaped adhesive target corresponding to one disposable diaper. Transmission holes are provided in the portions corresponding to the portions, for example, in the patterns shown in FIGS. With this configuration, when screen printing is performed by rotating the screen 260 in synchronization with the speed of the diaper manufacturing line, the step of forming the target portion 102 can be incorporated into the diaper manufacturing line. Of course, the target portion may be formed by screen printing using a method other than this method.

While the polyethylene film 20 having the target portion formed thereon is continuously supplied, hot melt adhesives are continuously applied to the back surface of the polyethylene film 20 from the application guns 19 and 23, respectively. The polyethylene film 20 is attached by a hot-melt adhesive so that it largely protrudes, and the elastic band 9 is attached by a hot-melt adhesive so as to form stretchable portions on both sides of the water absorbent material 3. On the other hand, roll 5 to nonwoven 4
Is continuously supplied, the hot-melt adhesive is continuously applied to the nonwoven fabric 4 from the coating gun 6, and the non-woven fabric 4 is attached to the other tissue paper 32 with the hot-melt adhesive so as to largely protrude. A polyethylene film 20 and a non-woven fabric 4 sandwiching a sandwich of tissue paper 2-water absorbing material 3-tissue paper 32 are obtained together. A paper diaper is obtained by cutting between the sandwich bodies and cutting both sides of each sandwich body so as to be curved.
It should be noted that although the formation of the tab having the adhesive surface was not mentioned, this is formed in a usual manner, for example.

From the coating guns 6, 19 and 23, the hot melt adhesive is discharged so as to draw a large number of lines, for example. Specific examples and comparative examples of the present invention will be shown below, but the present invention is not limited to the following examples. In the following, "part" means "part by weight". -Example 1-A paper diaper was manufactured by the apparatus shown in FIGS. 10 and 11 as described above. The screen coating of the hot melt resin composition used for forming the target portion is performed by a screen printing machine [LTI GRACO
ACO's Micro Print (MICRO PRIN)
T)], the coating temperature (screen temperature) was 110 ° C., the coating amount was 50 g / m ² , and the web speed was 100 m / min. The composition of the hot melt resin composition was as follows. Mixing of hot-melt resin composition -Base resin: EVA (EV-220 manufactured by Mitsui DuPont Polychemical Co., Ltd.) ... 33 parts-Adhesive resin: C ₉ hydrogenated petroleum resin (Arcon M- manufactured by Arakawa Chemical Industry Co., Ltd.) 115) ... 22 parts-Wax: Microcrystalline wax (Sazol H1 manufactured by Sazol Co.) ... 45 parts-Antioxidant: Antioxidant (Irganox 1010 manufactured by Ciba-Geigy Co., Ltd.) ... 0.4 parts-Coloring agent: Phthalocyanine blue ... 0.1 part These are well mixed in a molten state at 140 ° C. and have a thickness of 40 μm.
m polyethylene film.

Example 2 Example 1 was repeated except that the composition of the hot melt resin composition was changed as follows. Mixing of hot melt resin composition -Base resin: EVA (EV-210 manufactured by Mitsui DuPont Polychemical Co., Ltd.) ... 30 parts-Adhesive resin: C ₉ hydrogenated petroleum resin (Arcon M- manufactured by Arakawa Chemical Industry Co., Ltd.) 115) ... 25 parts-Wax: Microcrystalline wax (Sazol H1 manufactured by Sazol Co.)-45 parts-Antioxidant: Antioxidant (Irganox 1010 manufactured by Japan Ciba-Geigy Co., Ltd.) ... 0.4 part-Ultraviolet absorber : JF-77 manufactured by Johoku Chemical Co., Ltd ...
0.2 parts Colorant: Phthalocyanine blue ... 0.1 parts-Example 3-The procedure of Example 1 was repeated, except that the composition of the hot melt resin composition was changed as follows. Blending of hot melt resin composition -Base resin: EVA (EV-150 manufactured by Mitsui DuPont Polychemical Co., Ltd.) ... 33 parts-Adhesive resin: C ₉ hydrogenated petroleum resin (Arcon M- manufactured by Arakawa Chemical Industry Co., Ltd.) 115) ... 27 parts-Wax: Microcrystalline wax (Sazol H1 manufactured by Sazol Co., Ltd.) ... 40 parts-Antioxidant: Antioxidant (Irganox 1010 manufactured by Ciba-Geigy Co., Ltd.) ... 0.4 parts-Ultraviolet absorber : JF-77 manufactured by Johoku Chemical Co., Ltd ...
0.2 parts Colorant: Phthalocyanine blue ... 0.1 parts-Example 4-The procedure of Example 1 was repeated, except that the composition of the hot melt resin composition was changed as follows. Blending of hot-melt resin composition -Base resin: SBS (Sorprene T-414 manufactured by Asahi Kasei Corporation) ... 15 parts-Adhesive resin: C ₉ hydrogenated petroleum resin (Arcon M-100 manufactured by Arakawa Chemical Industry Co., Ltd.) ) ... 33 parts-Oil: Paraffin oil (PW-90 manufactured by Idemitsu Kosan Co., Ltd.) ... 7 parts-Wax: Microcrystalline wax (Sazol H1 manufactured by Sazol) ... 45 parts-Anti-aging agent: Antioxidant ( Irganox 1010 manufactured by Japan Ciba-Geigy Co., Ltd.) 0.4 part UV absorber: JF-77 manufactured by Johoku Chemical Co., Ltd.
0.2 part Colorant: Phthalocyanine blue ... 0.1 part The MI of the base resin used in the examples was as follows. EV-220: 150 EV-210: 400 EV-150: 30 T-414: 7.0 About the paper diapers of the said Examples 1-4, the following characteristics (1)-(6) of the target part were investigated. The results are shown in Table 1. (1) Surface energy The contact energy of solid was measured. (2) Adhesiveness with tabs (or fastening tapes) [Fastening tapes for commercial products, commercially available adhesive tapes for the examples (manufactured by 3M)]
The peel strength between the target and the target part was examined. (3) Refining property As in the above (2), bonding and peeling are repeated,
The fifth peel strength was measured. (4) Open Time A hot melt resin composition is applied to a polyethylene film having a thickness of 40 μm on a pilot line (the pilot line indicates the whole of FIG. 10) at 140 ° C. at a thickness of 150 μm.
It was melt-coated with, and the high quality paper was stuck together. By changing the line speed, the time until the high-quality paper was pasted after application was changed to 0.1 to 1.0 seconds, and the longest time for adhering was defined as the open time. (5) Blocking Property A polyethylene film was laminated on the same resin side of a sample obtained by coating the polyethylene film with the hot-melt resin composition of the example, and allowed to stand in a constant temperature bath at 60 ° C. for a whole day and night. It was confirmed whether the composition was attached (x) or not (◯). (6) Viscosity and Presence of Thread Pull The viscosity of each hot melt resin composition at 110 ° C. was measured with a Brookfield type Thermosel system viscometer.
In addition, the presence or absence of stringing of the hot melt resin composition during the screen coating was visually observed.

For comparison with the examples of the present invention, a target tape portion of a commercially available paper diaper (the following) was cut out and the characteristics (1) to (3) were examined. The results are shown in Table 1.
It was shown to. Comparative Example 1 ... P & G Pampers Comparative Example 2 ... Unicharm Co., Ltd. Ultra Mooney Comparative Example 3 ... Kao Co., Ltd. Marys

[0032]

[Table 1]

As can be seen from these results, in the example, all of the above characteristics (1) to (6) are at a level where there is practically no problem, and moreover, the material is less than the commercially available product, and it is simple. The target part was obtained in various steps.

[0034]

As described above, the article of the present invention can be reduced in cost in terms of material, and can also be reduced in cost by simplifying the manufacturing apparatus. Moreover, since there is a mark indicating the position where the tab is attached, it is convenient for use. As described above, the method for manufacturing an article of the present invention can reduce the cost in terms of materials, and can also reduce the cost by simplifying the manufacturing apparatus. Moreover,
It is possible to easily provide a mark indicating the tab attachment position.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment in which an article of the present invention is a disposable diaper.

FIG. 2 is a partial cross-sectional view thereof.

FIG. 3 is a plan view showing a pattern example of a target portion.

FIG. 4 is a plan view showing a pattern example of a target portion.

FIG. 5 is a plan view showing a pattern example of a target portion.

FIG. 6 is a plan view showing a pattern example of a target portion.

FIG. 7 is a plan view showing a pattern example of a target portion.

FIG. 8 is a plan view showing a pattern example of a target portion.

FIG. 9 is a plan view showing a pattern example of a target portion.

FIG. 10 is an explanatory view schematically showing an example in which the manufacturing method of the present invention is a method for manufacturing a disposable diaper.

FIG. 11 is an enlarged explanatory view schematically showing a main part thereof.

FIG. 12 is a cross-sectional view showing a conventional target portion.

FIG. 13 is an explanatory view schematically showing a conventional step of forming a target portion.

[Explanation of symbols]

 20 Polyethylene Film 25 Hot Melt Resin Composition 101 Base Material 102 Target Part 103 Tab 110 Paper Diaper 260 Cylindrical Screen

Claims (3)

[Claims] 1. An article comprising a target portion for removably adhering an adhesive surface of a tab, wherein the target portion is formed of a hot melt resin composition, wherein the tab attaching position of the target portion is set. An article having a target portion for adhesion, wherein the mark shown is drawn in a coating pattern of the hot melt resin composition. 2. A step of providing a target portion for removably adhering an adhesive surface of a tab on a surface of a continuously moving substrate, wherein the target portion is formed of a hot-melt resin composition. The method for producing an article having an adhesive target portion, wherein the hot melt resin composition is directly applied to the surface of the continuously moving substrate, wherein the application of the hot melt resin composition is performed by screen coating. A method for producing an article having an adhesive target portion, which is characterized by being performed. 3. The method for producing an article having an adhesive target portion according to claim 2, wherein a mark indicating the tab attachment position is drawn on the target portion with a coating pattern of the hot melt resin composition.