JP4709641B2 - Disposable disposable diaper manufacturing method - Google Patents

Description

The present invention relates to an indicator that makes it possible to recognize the presence of excrement such as urine and feces, particularly liquid excretion from the outside by discoloration, a method for manufacturing a disposable paper diaper having a so-called notification function, and more specifically, the indicator. while beautifully coated indicator attached to the transport roll, is transferred relates to the production how disposable diapers which prevents line soiling.

  Conventionally, when there is excrement such as urine and feces, especially liquid excrement, it is possible to recognize the excretion from the outside by touching the excrement and discoloring it. Disposable paper diapers with an indicator that is a hot melt adhesive containing bismuth are known. By adding a colorant to the hot-melt adhesive and also serving as an indicator, the colorant can be prevented from diffusing and leaching, and the indicator can be applied to the leakproof sheet inline. There is an advantage that the process is greatly labor-saving.

  However, when the indicator is applied to the leak-proof sheet in-line, the indicator is adhered to and transferred to each roll in the transport roll arranged downstream from the coating device, and the line is stained. There is a problem that the surface does not finish cleanly due to contact with the dirty conveying roller.

In order to cope with such a problem, the following Patent Document 1 proposes that the indicator is manufactured in a process different from the production process of the diaper by using a strip-shaped sheet piece and separating it from a paper diaper component. Yes.
Japanese Patent Laid-Open No. 9-140742

  However, when the indicator is produced in a process different from the diaper manufacturing process as in Patent Document 1, problems such as a significant reduction in production efficiency occur.

Therefore, the main problem of the present invention is to apply the indicator beautifully when applying the indicator in-line in the manufacture of disposable paper diapers coated with an indicator containing a colorant that detects the presence of excretion of urine and the like. together, the indicator is attached to the transport roll, is transferred, it is to propose a manufacturing how disposable diapers which prevents line soiling.

In order to solve the above problems, as the present invention according to claim 1, an absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impervious leak-proof sheet, and on the inner surface side of the leak-proof sheet, In producing disposable disposable diapers with an indicator that changes color by detecting bodily fluids,
After the indicator is applied to the continuous web-shaped leak-proof sheet, in one or more guide roller transport units having a guide roller for transporting the leak-proof sheet coated with the indicator to the next process, the guide roller transport unit is provided with the guide roller transport unit. All parts of the set is the guide roller group to form a concave groove continuous in portions corresponding to the coated portion of the indicator in the circumferential direction, and the indicator and the guide roller to avoid contact,
Subsequently, the leak-proof sheet was sent to a laminating process unit, and the leak-proof sheet was wound around the laminating drum in the laminating process part, and then fed out from the crepe paper roll to the application surface side of the indicator. After the crepe paper is joined at the pressure-bonding roll portion, the disposable paper diaper manufacturing method is provided in which the crepe paper is sent to an assembly process of the absorbent body and the top sheet .

  In the first aspect of the present invention, in the manufacturing process of the disposable paper diaper to which the indicator is applied, in the part or all of the guide roller group disposed in the guide roller transport unit, the indicator coating unit A concave groove which is continuous in the circumferential direction is formed in a portion corresponding to the above, so that the indicator and the guide roller do not come into contact with each other. Accordingly, the indicator can be applied beautifully, and the indicator can be prevented from adhering to and transferred to the transporting roll and soiling the line.

As a second aspect of the present invention, the guide roller is a drum-shaped roller having a slight downward slope from the concave groove to both ends, and wrinkles that may occur in the leak-proof sheet at the end of the guide roller conveyance unit. method for producing a disposable paper diaper according to claim 1, further comprising a pinch roller for removal is provided.

As described above in detail, according to the present invention, in the method of manufacturing a disposable paper diaper to which an indicator containing a colorant for detecting the excretion of urine or the like is applied, the indicator is beautiful when applied inline. In addition, the indicator can be prevented from adhering and transferring to the transfer roll, and the line from becoming dirty.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a product state appearance view of a disposable paper diaper 1 according to the present invention, and FIG. 2 is a developed view thereof.

  As shown in FIG. 1 and FIG. 2, a disposable paper diaper 1 (hereinafter simply referred to as a paper diaper) is placed between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. An absorbent main body 10 having an absorbent body 13 such as a pulp formed therein, a crepe paper 14 surrounding the absorbent body 13, and an exterior sheet 20 integrally provided on the outer surface side of the leak-proof sheet 12. A pants-type disposable diaper having a structure in which a waist opening and a pair of left and right leg openings are formed by joining the front body F and the back body B of the exterior sheet 20 on both sides in the product state.

  Further, an indicator 15 made of a hot melt adhesive containing a colorant is applied to a predetermined area on the inner surface side of the leak-proof sheet 12 as will be described later. This indicator 15 makes it possible to recognize from the outside that there has been excretion by touching this excrement etc. when it is excreted, such as urination or defecation, in particular liquid excretion, and is discolored. is there.

(Structure of the absorbent main body 10)
First, an example of the structure of the absorbent main body 10 will be described in detail based on FIG. 2 and FIG.
As described above, the absorbent main body 10 has a structure in which an absorbent body 13 such as cotton-like pulp is interposed between a liquid-permeable surface sheet 11 made of a nonwoven fabric or the like and a leak-proof sheet 12 made of polyethylene or the like. And absorbs and retains body fluids.

  In the illustrated example, the absorbent body 13 is formed with a substantially square shape in plan view, and the width dimension thereof is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion. The absorber 13 is surrounded by crepe paper 14. As the absorber 13, it is desirable to use an airlaid absorber that can reduce the bulk.

  As the liquid-permeable surface sheet 11 covering the surface side (skin contact surface side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of being bulky and soft. When a large number of through holes are formed in the liquid-permeable surface sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 extends to the back side of the absorbent body 13 around the side edge of the absorbent body 13.

  The leak-proof sheet 12 covering the back surface side (non-skin contact surface side) of the absorbent body 13 is made of a liquid-impervious plastic sheet such as polyethylene or polypropylene, but in recent years has moisture permeability from the viewpoint of preventing stuffiness. Those are preferably used. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  On the other hand, the gathered nonwoven fabric 16 that forms the three-dimensional gathered BS is a nonwoven fabric made into a double sheet by folding, and the side edge portion of the absorbent body 13 that is rolled up by the liquid-permeable surface sheet 11 is further rolled up from the upper side. The absorber 13 extends to the back side and is bonded. More specifically, the gathered nonwoven fabric 16 has a three-dimensional gather BS forming portion left in the middle portion in the longitudinal direction of the paper diaper, and a range extending from the middle portion in the width direction to the back side of the absorbent body 13 is bonded by a hot melt adhesive or the like. Further, at the front and rear end portions in the longitudinal direction, the section from the intermediate portion in the width direction to the one side end edge is bonded in a range extending to the back surface side of the absorber 13, and the portion forming the three-dimensional gather BS is the absorber. While being folded at the upper surface portion of 13, it is bonded by a hot melt adhesive or the like.

  In the gathered nonwoven fabric 16 formed of the double sheet nonwoven fabric, a plurality of thread-like elastic elastic members 17, 17... The thread-like elastic elastic members 17, 17... Are for forming a three-dimensional gather BS by raising a non-woven fabric portion protruding from the absorber side edge portion by elastic elastic force in a product state.

  The leak-proof sheet 12 enters the double sheet-like gathered nonwoven fabric 16 and constitutes a leak-proof wall on the lower end side of the three-dimensional gather BS. As the leak-proof sheet 12, it is desirable to use a transparent or translucent sheet so that the indicator 15 applied on the inner surface side can be visually observed from the outside. In the case of translucency, a plastic film is preferably used which is internally added with pigments and fillers such as calcium carbonate, titanium oxide, zinc oxide, white carbon, clay, talc, and barium sulfate. .

  As the thread-like elastic elastic member 17, a material such as styrene rubber, olefin rubber, urethane rubber, ester rubber, polyurethane, polyethylene, polystyrene, styrene butadiene, silicon, polyester, or the like that is usually used can be used. Further, in order to make it difficult to see from the outside, it is preferable that the thickness is 925 dtex or less and the tension is 150 to 350%. Instead of the thread-like elastic elastic member, a tape-like elastic elastic member having a certain width may be used.

  In the same manner as the liquid-permeable surface sheet 11, the material fiber constituting the gathered nonwoven fabric 16 is not only synthetic fibers such as polyethylene or polypropylene, but synthetic fibers such as polyester or polyamide, and regenerated fibers such as rayon and cupra. Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Furthermore, with respect to the gathered nonwoven fabric 16, in order to prevent permeation of urine and the like, to prevent fogging, and to enhance the touch to the skin (dry feeling), silicon-based, paraffin metal-based, alkylchromic croid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

  As shown in FIG. 3, the absorbent main body 10 and the exterior sheet 20 are integrally bonded to the upper surface side of the exterior sheet 20 by an adhesive such as hot melt. Then, the absorbent main body 10 and the outer sheet 20 are folded in the front-rear direction, and both sides thereof are joined to each other by heat welding or hot melt adhesive, thereby assembling the pants-type paper diaper 1 shown in FIG. It is done.

(Structure of exterior sheet 20)
Next, the structure of the exterior sheet 20 will be described in detail with reference to FIGS. 3 and 4. The exterior sheet 20 is a two-layer nonwoven fabric sheet in which the upper nonwoven fabric 20A and the lower nonwoven fabric 20B are bonded with a hot melt adhesive or the like, and various elastic elastic members are hot between the upper nonwoven fabric 20A and the lower nonwoven fabric 20B. It is bonded with a melt adhesive or the like to give stretchability. The planar shape forms a pseudo hourglass shape as a whole by the concave leg circumference cut lines 29 for forming leg openings on both sides of the middle.
In the exterior sheet 20 according to the present invention, as the elastic elastic member, as shown in the developed shape of FIG. 4, waist elastic elastic members 24, 24... Further, the back body B includes a plurality of waist elastic elastic members 25, 25,... Which are arranged along the horizontal direction at intervals in the vertical direction and for forming shearing around the waist.

  The waist elastic elastic members 24, 24... Are arranged in the vicinity of the waist opening edge in the range of the side joint edge 21 where the front body F and the back body B are joined, with an interval in the vertical direction. A plurality of elastic rubber elastic elastic members for attaching a disposable diaper to the body by applying an elastic force to tighten around the waist of the body. As the waist elastic elastic member 24, thread rubber is used in the illustrated example. However, for example, a tape-like elastic member may be used.

  The waist elastic elastic members 25, 25... Extend from the upper position to the lower position excluding the waist opening edge 23 of the side joint edge 21, or from the side joint edge 21 to the crotch side as shown in the figure. It is a rubber elastic elastic member that is arranged along the horizontal direction at intervals in the vertical direction over the range, and applies a horizontal elastic force to the waist part of the front body F and the back body B, respectively. This is for forming the waistline shearing zones K1, K2. It should be noted that the boundary between the waist elastic elastic members 24, 24... And the waist elastic elastic members 25, 25. For example, even if the number of elastic elastic members arranged in the horizontal direction with an interval in the vertical direction between the front body F and the back body B cannot be specified, some of the upper elastic members 24 on the upper side are provided. As long as the remaining elastic elastic member functions as the waist elastic elastic member 25.

  Particularly in the present invention, in order to prevent the absorbent body 13 from being contracted, the waist elastic members 25 are not continuous in the vicinity of the center where the absorbent main body is joined, and are elastically stretched across the absorbent main body 10. The members 25 are cut to be discontinuous, and the stretchability by the waist elastic members 25 is not provided. For example, as shown in Japanese Patent Application Laid-Open No. 2000-26015 and Japanese Patent Application Laid-Open No. 2002-273808, discontinuity of the elastic elastic member is performed by arranging various elastic elastic members on the exterior sheet 20 and then embossing cutter roll and anvil roll. The outer sheet may be passed between the two and the elastic stretchable member existing within a predetermined range may be finely cut by pressing or heating with the embossing cutter roll.

(Structure of indicator 15)
Next, the structure of the indicator 15 will be described in detail. In the present invention, the indicator 15 is composed of an adhesive containing a colorant that exhibits a color reaction upon contact with moisture. Various known adhesives can be used as the adhesive. Hereinafter, the case where a hot melt adhesive is used will be described in detail as an example.

By containing a colorant in the hot melt adhesive and also serving as an indicator, the colorant can be prevented from diffusing and leaching, and can be easily implemented in-line compared to the case of providing a sheet-like indicator. Therefore, the labor for attaching the indicator can be greatly saved.
The indicator component is obtained by adding a water-insoluble component such as a resin and a colorant to a water-soluble polymer. For example, a water-soluble polymer comprising a polyethylene glycol molecular weight of 100 to 500, polyvinyl pyrrolidone, a vinyl acetate copolymer, and a water-soluble polyester, a highly polar tackifying resin and a water-insoluble component of a plasticizer, and the acidity of the liquid in contact It comprises a colorant that indicates the degree of alkalinity (pH) by discoloration.

  The indicator 15 shown in FIGS. 2 and 3 shows the application region of the hot melt adhesive described above. This area | region is an area | region where the contact with the excretion absorbed by the absorber 13 is performed efficiently. The indicator 15 is formed on the inner surface side of the leak-proof sheet 12 by being applied in a planar shape, a strip shape or a number of streaks.

(About manufacturing equipment for disposable diapers 1)
Next, based on FIGS. 5-7, the application process equipment which apply | coats the indicator 15 which is a hot-melt-adhesive containing the coloring agent which detects the said pH to the said leak-proof sheet 12 among the manufacturing facilities of a paper diaper 2 will be described in detail. In addition, the other manufacturing processes are the same as the manufacturing process of a general paper diaper.
As shown in FIG. 5, the coating process facility 2 applies a coating unit 4 that applies the indicator 15 to the leak-proof sheet 12, and conveys the leak-proof sheet 12 to which the indicator 15 is applied to the next process 1 or And a plurality of guide roller conveyance units 5.

  The continuous web-shaped leak-proof sheet 12 is applied to the coating unit 4 after the indicator 15 is applied to a predetermined position on one side by the coating device 31 and then through the guide roller transport unit 5 to be a crepe which is the next process. It is sent to the paper laminating process section 3. In the crepe paper laminating process section 3, the leakage preventing sheet 12 is supplied to the laminating drum 30, and after being substantially circulated, the crepe paper 14 fed from a crepe paper roll (not shown) is joined to the pressure roll 32 site. Then, it is sent to an assembling process of the absorber 13, the top sheet 11, and the like.

In the coating unit 4, the indicator 15 is intermittently applied to the leak-proof sheet 12 by a coating device 31 at a predetermined interval as shown in FIG. 7. As the coating device 31, a spray coater, a curtain coater, a spiral coater or the like generally used for applying a hot melt adhesive can be used. The indicator 15 can be applied in any form such as a stripe shape, a band shape, or a planar shape. The coating amount is preferably ²⁰ to 30 g / m ² . When the amount is less than 20 g / m ² , the function as an indicator is impaired, and when it is more than 30 g / m ^2, a feeling of stickiness due to the curing of the adhesive is generated, and bleeding occurs at the time of joining with the crepe paper 14. Become.

  The leak-proof sheet 12 is sent to the laminating process unit 3 through the guide roller transport unit 5, and part or all of the guide roller groups 33, 33... Arranged in the guide roller transport unit 5, In the illustrated example, in all three guide rollers, as shown in FIG. 7, a concave groove 34 continuous in the circumferential direction is formed in a portion corresponding to the coating portion of the indicator 15, and the indicator 15 and the guide roller 33 does not come into contact.

  As shown in FIG. 6 (A), the guide roller 33 is a cylindrical roller having the same diameter over the entire length, and is continuous in the circumferential direction at the central portion corresponding to the coating portion of the indicator 15 of the body portion 33a. The concave groove 34 may be formed, or as shown in FIG. 6B, a drum-shaped roller provided with a slight downward gradient from the end portion to the concave groove 34 may be used. As shown in the figure, a drum-shaped roller having a slight downward slope from the concave groove 34 to both ends may be used. From the viewpoint of preventing wrinkle generation in the leak-proof sheet 12, it is desirable to use a drum-shaped roller as shown in FIG.

When the leak-proof sheet 12 passes through the guide rollers 33, 33... After the indicator 15 is applied, the area where the indicator 15 is applied and the concave shape provided in the guide roller 33, as shown in FIG. Since the grooves 34 correspond to each other, it is possible to prevent the indicator 15 and the guide roller 33 from coming into contact with each other, and the indicator 15 can be applied beautifully, and the indicator 15 is attached to the guide roller 33 and transferred. This will prevent the line from getting dirty.
The leak-proof sheet 12 that passes through the guide rollers 33, 33... Sags at the concave groove 34 provided in the guide roller 33 and may cause wrinkles in the subsequent process. It is desirable to provide a pinch roller 35 at the end of the sheet, and to remove wrinkles and slack generated in the leak-proof sheet 12 by the guide roller transport unit 5.

[Other examples]
(1) In the above embodiment, one concave groove 34 is formed in the center of the roll corresponding to the coating part of the indicator 15, but the indicator 15 is spaced apart, for example, in the form of two or three. If formed, two or three concave grooves 34 may be formed correspondingly.
(2) In the above embodiment, the concave groove 34 continuous in the circumferential direction in the portion corresponding to the coating portion of the indicator 15 has a square cross section in the illustrated example. For example, a triangular, U-shaped, trapezoidal, multistage It is also possible to prevent contact between the indicator 15 and the guide roller 33 as a cross-sectional shape such as a shape. In the present invention, the concept of the concave groove 34 includes the groove shapes of various cross sections described above.

In addition, although the said concave groove 34 was formed by cutting the guide roller 33 in this embodiment, it is a pair of convex part which continues in the circumferential direction on the width direction both sides of the site | part corresponding to the coating part of the indicator 15. It is also possible to form by providing.
(3) In the above embodiment, the present invention has been described by taking a pants-type disposable paper diaper as an example, but the present invention can be similarly applied to a tape-type disposable diaper. Moreover, in the said form example, although it was set as the paper diaper structure of the type which assembles the absorptive main body 10 and the exterior sheet | seat 20 at the last process, this invention is between a liquid-permeable surface sheet and a liquid-impermeable leak-proof sheet. The present invention can be applied to general paper diapers in which an absorber is interposed.
(4) In the above embodiment, the indicator 15 that detects and changes the color of body fluid is constituted by a hot-melt adhesive containing a colorant. However, the colorant is contained in another adhesive. Alternatively, the indicator 15 may be formed by directly applying a colorant.

It is a product state appearance view of disposable paper diaper 1 concerning the present invention. It is the development view. It is an exploded view of the disposable paper diaper. FIG. 3 is a development view of the exterior sheet 20. It is the schematic of the coating process equipment 2 which apply | coats the indicator 15 among diaper manufacturing equipment. (A)-(C) are figures which show the example of a profile of the guide roller 33, respectively. It is the perspective view which showed the state in which the leak-proof sheet | seat 12 passes the guide roller 33 part.

  DESCRIPTION OF SYMBOLS 1 ... Disposable paper diaper, 2 ... Application | coating process equipment, 3 ... Crepe paper bonding process part, 10 ... Absorbent main body, 11 ... Liquid-permeable surface sheet, 12 ... Leak-proof sheet, 13 ... Absorber, 14 ... Core wrap sheet , 15 ... Indicator, 16 ... Gathered nonwoven fabric, 17 ... Thread-like elastic elastic member, 20 ... Exterior sheet, 20A ... Upper layer nonwoven fabric, 20B ... Lower layer nonwoven fabric, 21 ... Side joint edge, 23 ... Around waist opening, 24 ... Waist portion Elastic elastic member, 25 ... waist elastic elastic member, 29 ... leg circumference cut line, 31 ... coating device, 32 ... pressure roll, 33 ... guide roller, 34 ... concave groove, 35 ... pinch roller, F ... front body, B ... back body

Claims (2)

Manufacture disposable disposable diapers in which an absorbent is interposed between a liquid-permeable surface sheet and a liquid-impervious leak-proof sheet, and an indicator that detects and changes the color of body fluid is applied to the inner surface of the leak-proof sheet. In doing so,
After the indicator is applied to the continuous web-shaped leak-proof sheet, in one or more guide roller transport units having a guide roller for transporting the leak-proof sheet coated with the indicator to the next process, the guide roller transport unit is provided with the guide roller transport unit. All parts of the set is the guide roller group to form a concave groove continuous in portions corresponding to the coated portion of the indicator in the circumferential direction, and the indicator and the guide roller to avoid contact,
Subsequently, the leak-proof sheet was sent to a laminating process unit, and the leak-proof sheet was wound around the laminating drum in the laminating process part, and then fed out from the crepe paper roll to the application surface side of the indicator. A method for producing a disposable paper diaper, characterized in that, after the crepe paper is joined at the pressure-bonding roll part, the crepe paper is sent to an assembling step with the absorbent body and the surface sheet . The guide roller is a drum-shaped roller provided with a slight downward slope from the concave groove to both ends, and includes a pinch roller for removing wrinkles that may occur in the leak-proof sheet at the end of the guide roller transport unit. The manufacturing method of the disposable paper diaper of Claim 1 .

Images