JP2004089336A - Body fluid absorbent product having hot melt fiber layer containing microbubble, and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a hot melt filament enters the inside of a body fluid absorbent layer (absorbable core) as the result of dropping to the inside of a body to be stuck and reduces a sticking effect and that the value of the product is reduced due to the exposure of an adhesive to the surface of a body fluid absorption product through a fluid-permeable thin layer. <P>SOLUTION: The body fluid absorbent product comprises the fluid-permeable thin layer, the body fluid absorption layer and a fluid non-permeable back sheet, and has a hot melt fiber layer generated in the case of sticking the body fluid absorption layer and the fluid-permeable thin layer, and the body fluid absorption layer and the fluid non-permeable layer. The hot melt fiber layer is a hot melt fiber layer which contains bubbles formed by spraying of a hot melt adhesive containing the microbubbles and which is generated by a hot melt filament screen applied surface formed by spraying the hot melt adhesive containing the microbubbles. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a body fluid absorbing product having a hot melt fiber layer (filamentous hot melt adhesive layer).
[0002]
[Prior art]
Body fluid absorption products (naphkins, disposable diapers, etc.) consist of a body fluid absorption layer (absorbent core) made of nonwoven fabric with a liquid absorber (polymer) inside, and a liquid permeable thin layer () and liquid impermeable (backsheet). ).
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 (backsheet). .
Regarding the above-mentioned hot melt fiber layer (web-like hot melt adhesive layer), Japanese Patent Publication No. 63-3664 discloses a method for forming a web-like adhesive layer using a 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]
The known hot melt fiber layer discloses that a hot melt filament (filamentous hot melt) is coated on the surface of an adherend in a web-like or mesh-like state. The hot melt filaments enter the bodily fluid absorbing layer (absorbent core) to reduce the adhesive effect and penetrate through the liquid permeable thin layer due to the weak bonding, the small size falling into the adherend, etc. There is a problem that the adhesive is exposed on the surface of the body fluid absorbing product and the product value is reduced.
Therefore, an object of the present invention is to improve the adhesiveness to a surface of an object to be bonded in forming a hot melt fiber layer, and to solve the above-mentioned problems of the known art.
[0004]
[Means for Solving the Problems]
The first invention of the present application (invention of claim 1 to claim 5) is a body fluid absorbing product, wherein a hot melt fiber layer is formed by spraying a hot melt adhesive layer containing fine bubbles by spraying a hot melt adhesive containing fine bubbles. It is characterized by forming a layer.
The second invention of the present application (the invention of claim 6) is characterized in that, in the first invention of the present application, the air-filled thread-like hot melt fiber layer is used as a hotment filament network coating surface.
The third invention of the present application (the invention of claim 7) is a method of manufacturing a body fluid absorbing product using a hot melt spray coating device that sprays and applies a hot-melt adhesive that has been heated and melted onto a surface to be bonded. The hot melt adhesive to be supplied to the adhesive hole is a hot melt adhesive containing fine bubbles, thereby forming a hot melt fiber layer containing fine bubbles on the surface to be bonded of the body fluid absorbing product. It is characterized by the following.
[0005]
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The first invention of the present application uses a nozzle device that has a pressurized air hole that penetrates an adhesive hole at the center of the nozzle and has a pressurized air hole opening close to the adhesive hole opening at the bottom of the nozzle. By supplying the hot melt adhesive containing fine bubbles, a hot melt fiber layer is formed on the surface to be bonded of the body fluid absorbing product by spray application of the hot melt adhesive.
By performing the above-mentioned spray coating as curtain spray coating, a coating surface is formed by a hot melt filament containing air bubbles in the form of a thin film. By applying the above-mentioned spray coating by spiral spray coating, a coating surface is formed by a hot melt filament containing spiral air bubbles. The spray coating is performed by flamen cosplay coating to form an application surface of a hot melt filament containing horizontal bubbles and a hot melt filament containing horizontal bubbles. By applying the above-mentioned spray coating by intermittent flamen cosplay coating, an application surface is formed by hot melt filaments containing bubbles having a point distribution of small droplets.
The second invention of the present application is a hot melt adhesive supplied to an adhesive hole of a nozzle, a hot melt adhesive containing fine bubbles, and hot melt filaments formed by spray application from a nozzle bottom face are adjacent to each other. Are formed on the surface to be bonded of the bodily fluid-absorbing product.
The third invention of the present application uses a nozzle device having a pressurized air hole which penetrates an adhesive hole in the center of the nozzle and has a pressurized air hole opening close to the adhesive hole opening on the nozzle bottom surface. In supplying a hot melt adhesive containing fine bubbles, a hot melt adhesive containing fine bubbles is supplied. 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 and mix the finely bubbled gas in the hot melt By setting it in the state, it is supplied to the adhesive hole of the nozzle.
[0006]
【Example】
FIGS. 13 and 14 show a nafkin 10 as an example of a bodily fluid absorbing product, in which a bodily fluid absorbing layer (absorbent core) 13 composed of a nonwoven fabric 12 containing a liquid absorbent (polymer) 11 is provided. (Top sheet) 14 and liquid impermeable layer (back sheet) 15.
The hot melt fiber layer A 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 backsheet.
[0007]
Referring to FIGS. 15 and 16, the hot melt fiber layer A adheres to the surface of the nonwoven fabric 12 in the form of a thin film hot melt fiber layer A1 of a fiber layer (web-like lamination) formed by intersecting yarns (fibers). are doing. In addition, it is also known to form a crushed (waterdrop-shaped) dotted A2 (FIG. 17) and a mesh layer A3 (FIGS. 18 and 19) where the filaments intersect.
[0008]
Hereinafter, in the examples of the present invention, the above-mentioned hot melt fiber layer (web-like hot melt adhesive layer) A is combined with a bubbled hot melt fiber layer B formed by hot melt filaments F containing fine bubbles. I do.
[0009]
Referring to FIG. 1, a nozzle 1 has an adhesive hole 2 and a pressurized air hole 3, penetrates the adhesive hole 2 at the center of the nozzle, and presses the adhesive hole opening 2a at a nozzle bottom surface 1a. The pressurized air holes 3 are arranged close to the air hole openings 3a.
The hot melt adhesive Hb containing fine bubbles is supplied to the adhesive hole 2.
[0010]
The two-phase flow of hot melt and gas is pressurized and pumped into a cylindrical tube to finely disperse the gas in the hot melt and make the hot melt contain fine gas bubbles and supply it to the adhesive holes 2. The hot melt adhesive Hb containing fine air bubbles can be formed.
[0011]
In the curtain spray coating device of FIG. 2, the hot melt filaments F sprayed from the adhesive openings 2a adjacent in the transverse direction of the coating line W are integrated with each other to form a curtain, and the play coating surface is a thin film layer B1. Fine bubbles are present in the filament F constituting the thin film layer B1, and the coated surface generates the hot melt fiber layer B containing bubbles.
[0012]
Referring to FIG. 3, fine bubbles P exist in hot melt fiber layer B containing bubbles. As a result, the thickness of the bubbled hot melt fiber layer B increases and the strength increases, so that the adhesive H does not fall into the space q of the nonwoven fabric 11. Therefore, the adhesion between the nonwoven fabric 11, 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 air bubbles into a spiral hot melt filament coating surface B2 by spiral spray coating, and becomes the coating surface B2 shown in FIG. By doing so, fine bubbles P are present in the filament F of the bubbled thread-like hot melt adhesive layer B, as shown in FIG. As a result, the thickness of the filament F increases and the strength increases, so that the adhesive H does not fall into the space q of the nonwoven fabric 11. Therefore, the adhesion between the nonwoven fabric 11, the top sheet 14, and the back sheet 15 becomes strong.
[0014]
The coating apparatus in FIG. 7 turns the hot melt fiber layer B into the horizontal spray application surface B3 in FIG. 8 by the flamenco cosplay application, and the filament F constituting the hot melt fiber layer B is nonwoven fabric as shown in 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]
The coating apparatus in FIG. 9 uses the intermittent curtain spray coating [curtain spray coating and intermittent coating (intermittent supply of pressurized air K0)] to apply the hot melt fiber layer B on the hot filament application surface of the point distribution of the droplets R. Constitute. Referring to FIG. 10, fine bubbles P are present in small droplets R of bubbled hot melt fiber layer B. As a result, since the diameter of the droplet R increases, the droplet R of the adhesive H does not fall into the space q of the nonwoven fabric 11. Therefore, the adhesion between the nonwoven fabric 11, the top sheet 14, and the back sheet 15 becomes strong.
[0016]
From the application device of FIG. 7, the hot melt adhesive fiber is applied from the plurality of other nozzles to the wind between the lower surface of the nozzle and the application surface, whereby the intersection is formed by entanglement with each other. Referring to FIG. 12, the mesh-coated surface B5 shown in FIG. 11 has a large thickness at the intersection X due to the presence of fine bubbles P in the filament F of the bubbled hot melt fiber layer B. Become.
[0017]
The filament f of the conventional mesh application surface A3 shown in FIGS. 18 and 19 is planar because there is no bulge at the intersection.
[0018]
Regarding the mesh coating, the bubbled thread-like hot melt adhesive has a large surface tension, so that even when the filaments cross, the overlapping portion (crossing portion) X rises to produce a preferable droplet exhibiting the bonding effect. The overlapping portion (intersection) X is approximately three times as high as the plane portion and has a three-dimensional shape.
[0019]
Specific numerical examples in the above 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 (a nonwoven fabric shape having an open area of 0.8 to 20 g per square meter).
The bubble size of the bubbled filament F is 5 to 30 μ diameter (bubble of 0.005 to 0.080 mm),
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 provides a body fluid-absorbing product by using a hot-melt adhesive layer in a body-fluid-absorbing product as a bubble-containing thread-like hot-melt adhesive layer generated by spraying a hot-melt adhesive containing fine bubbles. Increase the volume of the hot melt adhesive layer of the body fluid, absorb the body fluid absorbing layer (absorbent core) and the liquid permeable thin layer (top sheet) in the body fluid absorbing product, and remove the body fluid absorbing layer (absorbent core) This has the effect of securely and firmly adhering to the permeable layer (backsheet).
When applying an adhesive to a non-woven fabric having an open area, the bubble-filled thread-like hot melt adhesive layer has a higher surface tension than the conventional thread-like hot melt adhesive layer, so that the amount of adhesive used can be reduced and the release rate can be reduced. By maintaining the state in which the hot melt lands on the bonding surface without the adhesive dropping onto the area, the effect of preventing the adhesive from flowing out is exhibited. In particular, in the second invention of the present application, when forming the coating layer in a mesh state, the above-mentioned effect is made more remarkable by increasing the bonding force at the mesh intersection.
This greatly improves the product quality of body fluid absorbing products (sanitary material products such as napkins and disposable diapers). That is, since the flexibility is improved, the breakage of the product can be prevented, and the adhesive does not exist on the surface of the product, the use feeling of this kind of product is improved.
Also, maintaining the hot melt landing on the bonding surface eliminates hot melt splashing into the atmosphere and avoids roll, pelt, and machine contamination of the application line. This has the economic effect of improving production efficiency as well as reducing the washing / stopping of the application line.
[Brief description of the drawings]
FIG. 1 shows a nozzle of a spray coating apparatus, wherein FIG. 1A is a longitudinal sectional view and FIG. 1B is a bottom view.
FIG. 2 is a longitudinal sectional view showing an outline of a curtain spray coating device embodying the first invention of the present application.
FIG. 3 is a partial plan view of a coating surface showing a coating state.
FIG. 4 is a longitudinal sectional view showing an outline of a spiral spray coating device embodying the first invention of the present application.
FIG. 5 is a partial plan view of a coating surface showing a coating state.
FIG. 6 is a cross-sectional view of the coating surface, wherein FIG. 6A is a partial longitudinal sectional view and FIG. 6B is an enlarged sectional view.
FIG. 7 is a longitudinal sectional view showing an outline of a flamen cosplayer (side-running spray) coating apparatus embodying the first invention of the present application.
FIG. 8 is a partial plan view of a coating surface showing a coating state.
FIG. 9 is a longitudinal sectional view showing an outline of an intermittent curtain spray coating device embodying the first invention of the present application.
10A and 10B show a coating state, wherein FIG. 10A is a partial plan view and FIG. 10B is an enlarged sectional view.
FIG. 11 is a partial plan view showing a coating surface according to a second embodiment of the present invention.
12 shows an intersection in FIG. 11, wherein FIG. 12A is a partial plan view and FIG. 12B is an enlarged vertical sectional view.
FIG. 13 is a perspective view of a napkin as an example of a body fluid absorbing product.
FIG. 14 is a longitudinal sectional view of the same.
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 fiber layer in which crushed (water droplets) are scattered.
FIG. 18 is a partial plan view of the hot melt fiber layer of the mesh layer A3.
19 shows an intersection in FIG. 18, wherein FIG. 19A is a partial plan view and FIG. 19B is an enlarged vertical 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 Fine bubbles q Space 10 of nonwoven fabric 11 Nafkin 11 Liquid absorber (polymer)
12 Nonwoven fabric 13 Body fluid absorbing layer (absorbent core)
14 Liquid permeable thin layer (top sheet)
15 Liquid impermeable layer (back sheet)

Claims (7)

A liquid-permeable backing sheet having a liquid-permeable thin layer and a body fluid-absorbing layer, and a hot-melt fiber for bonding between the body fluid-absorbing layer and the liquid-permeable thin layer and between the body fluid-absorbing layer and the liquid-impermeable layer In the bodily fluid absorption product that formed the layer,
A body fluid absorbing product, wherein the hot melt fiber layer is a hot melt fiber layer containing air bubbles formed by spray application of a hot melt adhesive containing fine air bubbles. 2. The body fluid-absorbing product according to claim 1, wherein a bubble-containing hot melt fiber layer is formed on the hot melt filament-coated surface of the thin film by curtain spray coating with a bubble-containing hot melt adhesive. 2. The bodily fluid absorbing product according to claim 1, wherein a hot melt fiber layer containing air bubbles is formed on a spiral hot melt filament application surface by spiral spray application using a hot melt adhesive containing air bubbles. 2. The body fluid absorbing product according to claim 1, wherein a hot melt fiber layer containing air bubbles is formed on the side of the hot melt filament applied sideways by flamen cosplay application using a hot melt adhesive containing air bubbles. 2. The bodily fluid absorbing product according to claim 1, wherein a foamed hot melt fiber layer is formed on a hot melt filament coating surface having a point distribution of small drops by curtain sco spray coating with a hot melt adhesive containing bubbles. . A liquid-permeable backing sheet having a liquid-permeable thin layer and a body fluid-absorbing layer, and a hot-melt fiber for bonding between the body fluid-absorbing layer and the liquid-permeable thin layer and between the body fluid-absorbing layer and the liquid-impermeable layer In the bodily fluid absorption product that formed the layer,
The above-mentioned hot-melt fiber layer is a bubble-containing hot-melt fiber layer formed by a hot-melt filament network coating surface formed by spray application of a hot-melt adhesive containing fine bubbles, characterized in that it is a body fluid absorption. Product. A method of manufacturing a body fluid absorbing product using a hot melt spray coating device that generates a hot melt fiber coating surface on a surface to be coated by applying pressurized air to a hot melt hot melt adhesive discharged from a tip of an adhesive hole. At
By forming the hot melt adhesive supplied to the adhesive hole as a hot melt adhesive containing fine bubbles, a hot melt fiber layer containing fine bubbles is formed on the surface to be bonded of the body fluid absorbing product. A method for producing a body fluid absorbing product having a hot melt fiber layer containing fine bubbles.

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