JP4317931B2 - Body fluid absorbent product having hot melt fiber layer containing fine bubbles and manufacturing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to body fluid absorbing products with hot melt fibers layer (filamentous hot-melt adhesive layer).
[0002]
[Prior art]
Body fluid-absorbing products (nafkin, disposable diapers, etc.) consist of a body fluid-absorbing layer (absorbent core) made of nonwoven fabric with a liquid absorber (polymer polymer), a liquid-permeable thin layer ( top sheet ) and a liquid-impermeable ( (Back sheet).
A hot melt fiber layer is interposed between the body fluid absorbing layer (absorbent core) and the liquid permeable thin layer, and between the body fluid absorbing layer (absorbent core) and the liquid impermeable layer (back sheet). .
Regarding the above hot melt fiber layer (web-like hot melt adhesive layer), Japanese Patent Publication No. 63-3664 Patent Publication “Method of forming web adhesive layer with thermoplastic polyester adhesive” and Japanese Patent No. 2510495 There is a known technique of “disposable waste storage garment”.
[0003]
[Problems to be solved by the invention]
In the known hot melt fiber layer, it is disclosed that a hot melt filament (thread-like hot melt) is formed in a web-like or mesh-like state on the surface of an adherend. The hot melt filaments enter the body fluid absorption layer (absorbent core) to reduce the adhesive effect and pass through the liquid permeable thin layer. There is a problem in that the adhesive is exposed on the surface of the body fluid absorbing product to reduce the product value.
Therefore, this invention makes it a subject to improve the adhesiveness to the to-be-adhered body surface in the formation of a hot-melt fiber layer, and to eliminate the problem of said well-known technique.
[0004]
[Means for Solving the Problems]
The first invention of the present application (the inventions of claims 1 to 4 ) is a foamed hot melt fiber produced by spray coating of a hot melt adhesive containing fine bubbles in a body fluid absorbing product. It is characterized by being a layer.
The second invention of the present application (the invention of claim 5 ) is characterized in that, in the first invention of the present application, the foamed hot melt fiber layer containing air bubbles is used as a hotment filament network coating surface.
A third invention of the present application (invention of claim 6 ) is a method for producing a body fluid absorbing product using a hot melt spray coating apparatus for spray coating a hot melt adhesive heated and melted toward a surface to be bonded. The hot melt adhesive to be supplied to the adhesive holes is a hot melt adhesive containing fine bubbles, thereby forming a hot melt fiber layer containing fine bubbles on the adherend surface of the body fluid absorbent product. It is characterized by that.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
The first invention of the present application uses a nozzle device that penetrates an adhesive hole in the center of the nozzle and has a pressurized air hole that is close to the adhesive hole opening on the bottom surface of the nozzle. By supplying a hot melt adhesive containing fine bubbles, a hot melt fiber layer is formed on the adherend surface of the body fluid absorbent product by spray application of the hot melt adhesive.
By applying the above-described spray coating to curtain spray coating, a coating surface is formed by a thin-film bubbled hot melt filament. By applying the above-described spray coating by spiral spray coating, a coating surface is formed by spiral hot-melt filaments with bubbles. The above spray coating, that due Flamenco spray coating, that form a coating surface by the lateral shake aerated hot melt filaments by aerated hotmelt filaments.
In the second invention of the present application, the hot melt adhesive supplied to the adhesive hole of the nozzle is a hot melt adhesive containing fine bubbles, and the hot melt filaments formed by spray coating from the bottom of the nozzle are adjacent to each other. A foamed hot-melt filament network-coated surface formed by crossing each other is formed on the adherend surface of the body fluid absorbent product.
The third invention of the present application uses a nozzle device that penetrates an adhesive hole in the center of the nozzle and has a pressurized air hole that is close to the adhesive hole opening on the bottom surface of the nozzle. In supplying the hot melt adhesive containing fine bubbles, the hot melt adhesive containing fine bubbles is supplied. A hot melt adhesive containing fine bubbles pressurizes a two-phase flow of hot melt and gas and pumps it into a cylindrical tube to finely disperse the gas in the hot melt, so that fine bubble gas is mixed in the hot melt. By setting the state, it is supplied to the adhesive hole of the nozzle.
[0006]
【Example】
FIG. 13 and FIG. 14 show a napkin 10 as an example of a body fluid absorbing product, and a body fluid absorbing layer (absorbent core) 13 made of a nonwoven fabric 12 in which a liquid absorbing body (polymer polymer) 11 is provided is a liquid permeable thin layer. It is arranged between a (top sheet) 14 and a liquid impermeable layer (back sheet) 15.
The hot melt fiber layer A is interposed in the adhesion between the body fluid absorption layer (absorbent core) and the liquid permeable thin layer, and the adhesion between the body fluid absorption layer (absorbent core) and the liquid impermeable back sheet.
[0007]
15 and 16, the hot melt fiber layer A is attached to the surface of the non-woven fabric 11 in the form of a thin film hot melt fiber layer A1 of a fiber layer (web-like laminate) formed by crossing yarns (fibers). is doing. In addition, it is also known to use a mesh layer A3 (FIGS. 18 and 19) in which crushed (water droplets) interspersed A2 (FIG. 17) and the filaments intersect.
[0008]
Hereinafter, in the examples of the present invention, the hot melt fiber layer (web-like hot melt adhesive layer) A is a hot melt fiber layer B containing bubbles formed by hot melt filaments F containing fine bubbles. To do.
[0009]
Referring to FIG. 1, a nozzle 1 has an adhesive hole 2 and a pressurized air hole 3, passes through the adhesive hole 2 in the center of the nozzle, and pressurizes the adhesive hole opening 2a on the nozzle bottom surface 1a. The pressurized air hole 3 is disposed in close proximity to the air hole opening 3a.
A hot melt adhesive Hb containing fine bubbles is supplied to the adhesive hole 2.
[0010]
Supplying to the adhesive hole 2 by pressurizing and feeding the two-phase flow of hot melt and gas into the cylindrical tube to finely disperse the gas in the hot melt and make the gas bubbles coexist in the hot melt The hot melt adhesive Hb containing fine bubbles to be formed can be formed.
[0011]
In the curtain spray coating apparatus of FIG. 2, the hot melt filaments F sprayed from the adhesive openings 2a adjacent to each other in the transverse direction of the coating line W are integrated into a curtain shape, and the pre-coating surface is a thin film layer B1. Fine filaments are present in the filament F constituting the thin film layer B1, and a hot melt fiber layer B containing bubbles is generated on the coated surface.
[0012]
With reference to FIG. 3, the fine bubble P exists in the hot-melt fiber layer B containing a bubble. As a result, the thickness of the hot melt fiber layer B containing bubbles increases and the strength increases, and the adhesive H does not fall into the space q of the nonwoven fabric 11. Therefore, adhesion between the nonwoven fabric 11 and the top sheet 14 and the back sheet 15 becomes strong.
[0013]
The coating apparatus shown in FIG. 4 turns the hot melt fiber layer B containing bubbles into a spiral hot melt filament coating surface B2 by spiral spray coating, which becomes the coating surface B2 shown in FIG. As a result, the fine bubbles P are present in the filament F of the foamed hot melt adhesive layer B with reference to FIG. As a result, the thickness of the filament F increases, the strength increases, and the adhesive H does not fall into the space q of the nonwoven fabric 11. Therefore, adhesion between the nonwoven fabric 11 and the top sheet 14 and the back sheet 15 becomes strong.
[0014]
The coating apparatus shown in FIG. 7 has a hot melt fiber layer B formed by flamen cosplay application to become a horizontal spray application surface B3 shown in FIG. 8, and the filament F constituting the hot melt fiber layer B is a non-woven fabric with reference to FIG. 11 is adhered to the surface. Fine bubbles P exist in the filament F of the hot melt fiber layer B containing bubbles.
[0015]
Coating apparatus of FIG. 9, the intermittent curtain spray coating [curtain spray coating and intermittent coating (intermittent supply pressurized air K0)], composed of coated cloth surface punctate distribution of droplet R. In the droplet R, referring to FIG. 10, fine bubbles P are present. As a result, the diameter of the droplet R increases, so that the droplet R of the adhesive H does not fall into the space q of the nonwoven fabric 11. Therefore, adhesion between the nonwoven fabric 11 and the top sheet 14 and the back sheet 15 becomes strong.
[0016]
From the coating apparatus of FIG. 7, the hot melt adhesive fiber is applied between the nozzle lower surface and the coating surface by a plurality of other nozzles, and the intersection is formed by entanglement with each other. The mesh-coated surface B5 shown in FIG. 11 is three-dimensional with reference to FIG. 12, because the fine bubbles P are present in the filaments F of the hot-melt fiber layer B containing bubbles, and the thickness is increased at the intersection X. Become.
[0017]
The filament f on the conventional mesh application surface A3 shown in FIGS. 18 and 19 is planar because there is no bulge at the intersection.
[0018]
For mesh application, the bubble-like hot melt adhesive has a large surface tension, and even when the filaments intersect, the overlapping portion (intersection) X rises and produces a preferable droplet that exhibits an adhesive effect. The overlapping portion (intersection portion) X is approximately three times as high as the plane portion and has a three-dimensional shape.
[0019]
Specific numerical examples in the above-described embodiment are as follows.
The size of the aerated filament F constituting the hot melt fiber layer B is a continuous or discontinuous filament having a diameter of 6 to 80 μm.
The thickness of the thin film layer and the mesh thin film layer is 0.1 to 0.3 mm (0.8 to 20 g weight per square meter, in the form of a nonwoven fabric with an open area).
The bubble size of the bubbled filament F is 5 to 30 μ diameter (0.005 to 0.080 mm bubble),
The bubble density is 30 to 50%, and the volume expansion is about 1.3 to 2.0 times.
The size of the droplet R is 0.2 to 0.8 mm in diameter.
[0020]
【The invention's effect】
The present invention relates to a body fluid-absorbing product in which the hot-melt adhesive layer in a body fluid-absorbing product is a foamed hot-melt adhesive layer containing bubbles produced by spray application of a hot-melt adhesive containing fine bubbles. The volume of the hot melt adhesive layer is increased, and the body fluid absorbing layer (absorbent core) and the liquid permeable thin layer (top sheet) in the body fluid absorbing product are bonded together. It has the effect of securely and firmly adhering to the transmission layer (back sheet).
When applying adhesive to non-woven fabrics with open areas, the foamed hot melt adhesive layer with foam has a higher surface tension than the conventional thread hot melt adhesive layer, so the amount of adhesive used can be reduced and the adhesive can be opened. By maintaining the state where the hot melt has landed on the bonding surface without the adhesive falling on the area, the adhesive does not penetrate and flow out. In particular, according to the second invention of the present application, when the coating layer is formed in a mesh-like state, the above-described effect is made more remarkable by increasing the binding force at the mesh intersection.
This greatly improves the product quality of body fluid absorption products (sanitary material products such as nafkin and disposable diapers). That is, the flexibility is improved, the product can be prevented from being damaged, and the absence of an adhesive on the surface of the product has the effect of improving the feeling of use of this type of product.
Also, maintaining hot melt landing on the adhesive surface eliminates hot melt splashing into the atmosphere and avoids contamination of rolls, pelts, and machinery in the coating line. This can reduce the cleaning / stopping of the coating line, and has an economic effect of improving production efficiency.
[Brief description of the drawings]
FIG. 1 shows a nozzle of a spray coating apparatus, in which a is a longitudinal sectional view and b is a bottom view.
FIG. 2 is a longitudinal sectional view showing an outline of a curtain spray coating apparatus embodying the first invention of the present application.
FIG. 3 is a partial plan view of a coating surface that similarly shows a coating state.
FIG. 4 is a longitudinal sectional view showing the outline of a spiral spray coating apparatus embodying the first invention of the present application.
FIG. 5 is a partial plan view of a coating surface that similarly shows a coating state.
FIG. 6 is a sectional view of the coated surface, in which FIG. 6a is a partial longitudinal sectional view, and FIG. 6b is an enlarged sectional view.
FIG. 7 is a longitudinal sectional view showing the outline of a flamen cosplay (horizontal spray) coating apparatus embodying the first invention of the present application.
FIG. 8 is a partial plan view of the application surface showing the application state.
[9] Without embodying the present gun onset bright but is a longitudinal sectional view showing an overview of an intermittent curtain spray coating device.
FIG. 10 shows the state of application in the same manner. FIG. 10a is a partial plan view, and FIG.
FIG. 11 is a partial plan view showing an application surface according to the second invention of the present application.
12 is a cross-sectional view of FIG. 11, in which FIG. 11a is a partial plan view, and FIG. 12b is an enlarged longitudinal sectional view.
FIG. 13 is a perspective view of a naphthkin as an example of a body fluid absorption product.
FIG. 14 is a longitudinal sectional view similarly.
FIG. 15 is a partial longitudinal sectional view of a hot melt fiber layer.
FIG. 16 is a partial plan view of a thin film hot melt fiber layer.
FIG. 17 is a partial plan view of a hot melt application surface A1 scattered in a crushed shape (water droplet shape ).
FIG. 18 is a partial plan view of a hot-melt fiber layer of network layer A3.
FIG. 19 is a cross-sectional view of FIG. 18, where a is a partial plan view, and b is an enlarged longitudinal sectional view.
[Explanation of symbols]
A Hot melt fiber layer B Hot melt fiber layer with bubbles F Hot melt filament Hb Hot melt adhesive P containing fine bubbles P Fine bubbles q Space 10 of nonwoven fabric 11 Nafkin 11 Liquid absorber (polymer polymer)
12 Nonwoven fabric 13 Body fluid absorbing layer (absorbent core)
14 Liquid permeable thin layer (top sheet)
15 Liquid impervious layer (back sheet)

Claims (6)

And a liquid permeable lamina and the body fluid absorbent layer and a liquid impermeable layer, the hot-melt fiber layer Upon adhesion and between the body fluid absorbent layer and a liquid impermeable layer and the body fluid absorbent layer and a liquid permeable lamina In the body fluid absorption product that produced
The hot melt fibers layer, body fluid absorbent products, characterized in that the aerated hot melt fiber layer formed by spray coating of a hot melt adhesive containing fine bubbles. The curtain spray coating of a hot melt adhesive, as a thin film-like hot melt filaments coated surface, a body fluid absorbent product according to claim 1, characterized in that the formation of the host Tsu preparative melt fiber layer. Wherein the spiral spraying hot melt adhesive, as a spiral hot melt filaments coated surface, a body fluid absorbent product according to claim 1, characterized in that the formation of the host Tsu preparative melt fiber layer. Wherein the Flamenco spraying hot melt adhesive, as a wobbling motion like hotmelt filaments coated surface, a body fluid absorbent product according to claim 1, characterized in that the formation of the host Tsu preparative melt fiber layer. And a liquid permeable lamina and the body fluid absorbent layer and a liquid impermeable layer, the hot-melt fiber layer Upon adhesion and between the body fluid absorbent layer and a liquid impermeable layer and the body fluid absorbent layer and a liquid permeable lamina In the body fluid absorption product that produced
The hot-melt fiber layer, the body fluid absorbent, characterized in that to produce a hot-melt filament mesh coating surface formed by spray coating of a hot melt adhesive containing the fine bubbles, and aerated hot melt fiber layer Product. By the action of pressurized air to the heating and melting the hot melt adhesive discharged from the tip of the adhesive holes claims 1 to using a hot melt spray coating apparatus for generating a hot-melt fiber coating surface to be coated surface In the manufacturing method of the bodily fluid absorption product of 5 .
The hot melt adhesive supplied to the adhesive holes, by a hot melt adhesive containing the fine bubbles, the adherend surface of the body fluid absorbent products, forming a layer of hot-melt fibers containing fine cells A method for producing a body fluid-absorbing product having a hot melt fiber layer containing fine bubbles.

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