JP2004255176A - Surface material for absorptive article and absorptive article using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface material for absorptive articles and an absorptive article, in which a form retaining property at the time of wetting is good, a touch to the skin is good, a humor absorbing nature is good, a sticking feeling after absorbing humors is little, and a stuffy feeling is little. <P>SOLUTION: In this surface material for the absorptive articles comprising cellulose filament nonwoven fabrics, and 70% or more of fiber composing at least the surface of the nonwoven fabric has a single fineness of 0.1-0.55 dtex. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

  The present invention relates to a surface material for absorbent articles such as a panty liner, an incontinence pad, a sanitary napkin, a puerperal pad (a napkin for childbirth), and a disposable diaper, and an absorbent article. More specifically, the surface material for absorbent articles and the absorbent article have good shape retention when wet, good touch, good body fluid absorption, little stickiness after body fluid absorption, and little stuffiness. About.

Examples of the surface material for absorbent articles include those obtained by treating a synthetic fiber nonwoven fabric with a water-permeable agent and those obtained by treating a perforated film with a water-permeable agent. These facings are primarily intended to allow body fluids to pass faster and be absorbed by the absorbent under the facing. However, synthetic fiber nonwoven fabrics and apertured films have poor hygroscopicity, and tend to be stuffy when worn under high-temperature and high-humidity conditions, such as during the rainy season or summer, and have a problem of causing discomfort when worn.
In order to solve such a problem, Patent Document 1 discloses that cellulose fibers are mainly used as a surface material. However, cellulose fibers have a high affinity for water and take in water into the fibers, and thus have a problem that a sticky feeling is caused. Further, the flexibility is increased, but if the wear is continued, the shape retention is deteriorated, and there is a problem such as twisting.
Patent Document 2 discloses that a cellulosic long-fiber nonwoven fabric is used as a surface material. According to this method, although a surface material excellent in dry and wet strength and body fluid diffusibility can be obtained even with a low basis weight, there are problems in the strength when wet and the shape retention after absorbing body fluid.

Japanese Patent No. 3200673 JP-A-9-154870

  The surface material and absorbent article for an absorbent article according to the present invention have a good form retention property when wet, a good feel, a good body fluid absorption property, a small sticking feeling after absorbing the body fluid, and a little stuffy feeling. The purpose is to provide.

In view of the above problems, the present inventors have studied a method for improving the morphological stability when wet while taking advantage of the characteristics of the cellulose long-fiber nonwoven fabric, and improving the morphological stability even when wet by reducing the single fineness, Further, they have found that a smooth tactile sensation can be obtained by reducing the single fineness, and have accomplished the present invention.
That is, the present invention is as follows.
(1) An absorbent article surface material comprising a cellulose long-fiber nonwoven fabric, wherein at least 70% of fibers constituting the surface of the nonwoven fabric have a single fineness of 0.1 to 0.55 dtex. Surface material for decorative articles.
(2) The surface material for an absorbent article according to (1), wherein the nonwoven fabric has a wet form retention of 80% or more.
(3) The surface material for an absorbent article according to (1) or (2), wherein the nonwoven fabric is a regenerated cellulose continuous filament nonwoven fabric.
(4) An absorbent article comprising at least a surface material and an absorbent, wherein the surface material is the surface material for an absorbent article according to any one of (1) to (3). Products.
(5) An absorbent article provided with a surface material also serving at least as an absorbent, wherein the surface material is the surface material for an absorbent article according to any one of (1) to (3). Absorbent articles.

  The surface material for absorbent articles of the present invention has extremely good shape retention when wet, and an absorbent article using the same has a good touch, good body fluid absorption, and a feeling of sticking after body fluid absorption. It is possible to provide an extremely ideal absorbent article having a small amount, a good shape retention property when wet, a small stuffiness, and a low skin irritation.

The present invention will be specifically described below.
The cellulose long-fiber nonwoven fabric referred to in the present invention is, for example, a continuous length of regenerated cellulose obtained by continuously spinning a stock solution of a copper-ammonium rayon onto a net by a down-straining spinning method, and bonding and entangled by self-adhesion of the fiber itself and hydroentanglement. The term refers to a fibrous nonwoven fabric or a purified cellulose long-fiber nonwoven fabric such as lyocell manufactured by the method disclosed in JP-T-2002-521585.
The surface material for absorbent articles of the present invention is characterized by being made of nonwoven fabric of cellulose long fiber. Cellulose long-fiber nonwoven fabrics are long fibers, so that they are less likely to fall off when used as a surface material, and are less contaminated by fiber adhesion to the human body than short-fiber nonwoven fabrics such as cotton.
In addition, in the case of a regenerated cellulose continuous filament nonwoven fabric, since a nonwoven fabric is formed by self-adhesion and hydroentanglement as described above, a binder such as an adhesive resin is not used at the time of forming the nonwoven fabric. Therefore, it is preferable because it is excellent in safety. Further, self-adhesion is preferable because of high form stability.

The cellulose long-fiber nonwoven fabric used for the surface material for absorbent articles of the present invention is such that at least 70%, preferably 80%, and most preferably 100% of the fibers constituting at least the surface of the nonwoven fabric have a single fineness of 0.1 to 0. 0.555 dtex, preferably 0.1 to 0.4 dtex, more preferably 0.1 to 0.3 dtex. Since at least 70% of the fibers forming the surface of the nonwoven fabric have a single fineness of 0.1 to 0.55 dtex, the entanglement points of the fibers constituting the nonwoven fabric are lower than those having a single fineness exceeding this range with the same basis weight. And the number of self-adhesive points are increased, so that the morphological stability when wet is greatly improved. Further, in the case of the regenerated cellulose continuous long-fiber nonwoven fabric, the fineness of the single yarn is improved by reducing the single fineness, so that the whiteness is increased and the cleanliness as a sanitary material is improved. Furthermore, whiteness increases due to irregular reflection, and cleanliness as a sanitary material is improved.
If at least 70% of the fibers having a single fineness of 0.1 to 0.55 dtex constituting at least the surface of the nonwoven fabric are less than 70%, the form stability at the time of wetting and the whiteness are reduced. In addition, when the single fineness is in this range, the water transport performance is also improved by the capillary phenomenon.

The cellulose fiber nonwoven fabric used in the absorbent article of the present invention preferably has a wet form retention of 80% or more, more preferably 90% or more, and most preferably 100%. Here, the wet form retention is measured by the following method. FIG. 1 shows a schematic diagram of the measuring device. A sample is prepared in a size of 5 cm × 12 cm so as to be vertically elongated in the machine axis direction of the nonwoven fabric, and a measuring part is created by marking the center of the upper and lower 1 cm portions. Uniformly imparting 10 volumes of pure water sample weight W ₁ to the sample. The upper and lower 1 cm of the sample is sandwiched between sample holding plates and fixed. The sample was suspended for 30 seconds by applying a load of 30% by weight of the sample weight W ₁ per 1 m ² (the sample holding plate was 10% by weight of W ₁ , and the load was applied thereto), and then de-weighted (the lower part). The sample holding plate is also removed), and after 30 seconds, the length L of the measuring section is measured. The initial sample length is 10 cm (the length between the sample holding plates), and the wet form retention is calculated by the following equation.
Wet form retention (%) = (10− (L−10)) / 10 × 100
The wet form retention greatly correlates with the repellency after absorbing body fluids and the like. If the wet form retention is less than 80%, the surface material may be distorted after absorbing the body fluid and the wearing feeling may be reduced, or the surface material may be broken and the absorbent may come into contact with the body surface.
The wet form retention rate can be controlled by the arrangement direction of the fibers forming the nonwoven fabric and the entangled state of the fibers. In order to improve the wet form retention, the number of fibers arranged in the direction perpendicular to the machine axis is increased, and the number of entangled points of the fibers is increased by decreasing the single fineness of the fibers constituting the nonwoven fabric and increasing the number of fibers present. By increasing it, the wet form retention can be made favorable.

The cellulose long-fiber nonwoven fabric used for the surface material for absorbent articles of the present invention has a horizontal water infusion rate of preferably 30 mm / min or more and 150 mm / min or less, more preferably 40 mm / min or more and 120 mm / min or less. Here, the horizontal water infusion rate refers to a rate measured by the following method. FIG. 2 shows a schematic diagram of the measuring device. A sample having a width of 50 mm and a length of 33 cm is prepared. The sample has a vertical rising portion of 30 mm, is deflected at right angles by a glass rod having a diameter of 1.5 mm, and is arranged horizontally (hereinafter, this right angle deflecting section is referred to as a horizontal deflecting section). A glass rod of the same diameter is set every 10 mm for supporting the sample. Immerse water in a bat or the like up to 12 mm below the vertical rise part of the sample. One minute after the water reaches the horizontal deflecting unit, the length of water reaching from the horizontal deflecting unit is measured.
The measurement is performed 10 times, and the average value is taken as the horizontal water inflow rate. When the horizontal water infusion rate is less than 30 mm, the bodily fluid is hardly diffused, and when the liquid permeability is poor, the bodily fluid remains near the surface, causing a sticky feeling. If the horizontal water infusion rate exceeds 150 mm / min, depending on the size (size, length) of the absorbent article, the body fluid rapidly moves to near the end of the absorbent article, and contaminates a wide area by leaking back. And the body fluid is more likely to adhere to the underwear than at the end, which is not preferable.

The cellulose long-fiber nonwoven fabric used for the surface material for absorbent articles of the present invention preferably has a basis weight of 7 to 30 g / m ² , more preferably 10 to 25 g / m ² . If the basis weight is less than 7 g / m ² , the strength at the time of moistening is reduced, and it becomes impossible to wear. If the basis weight is more than 30 g / m ² , the flexibility may be reduced and a feeling of strangeness may be caused when worn. The thickness of the cellulose long-fiber nonwoven fabric used for the surface material for absorbent articles of the present invention is preferably 0.1 to 0.4 mm, more preferably 0.11 to 0.4 mm, from the viewpoint of promptly transferring body fluid to the absorbent. 3 mm. If the thickness is less than 0.1 mm, a problem may occur in the wet strength. If it exceeds 0.4 mm, the absorption speed of the liquid may be reduced, which may adversely affect the stickiness.
Cellulose long-fiber nonwoven fabric used for the surface material for absorbent articles of the present invention has a mesh pattern with openings or a pattern due to openings or a pattern due to irregularities from the viewpoint of promptly transferring body fluid to the absorbent or the design. May be formed. When there is an opening for promptly transferring body fluid to the absorbent, the shape of the opening is not particularly limited, but the average area of the opening is 0.1 to ² mm ² from the viewpoint of strength and flexibility. And more preferably 0.2 to ¹ mm ² . If the average area of the openings is less than 0.1 mm ² , the liquid passing speed may decrease. If the average area of the opening exceeds 2 mm ² , discomfort may increase due to re-wetting from the absorbent. Further, the area ratio of the opening portion to the entire surface material is preferably 3 to 25%, and more preferably 10 to 20%. When the area ratio of the opening portion to the entire surface material is less than 3%, the liquid passing effect may be reduced. If the area ratio of the apertures to the entire surface material exceeds 25%, the strength at the time of wetting decreases, and a problem may occur in shape retention such as twisting. If there are openings, the diffusion sheet is made of a surface material and an absorbent material to prevent the granular polymer absorbent in the absorbent material from leaking to the surface and to improve the efficiency of bodily fluid absorption by the absorbent material. It may be in between.

The cellulose long-fiber nonwoven fabric of the present invention may be composited as long as the above conditions are satisfied. For example, in order to improve the hygroscopicity and the bodily fluid absorptivity of the surface material itself, nonwoven cellulose long-fiber nonwoven fabrics having different single fineness may be combined by hydroentanglement or the like. In this case, fibers having different single fineness may come out on the surface, but the effect is not affected as long as the conditions are within the above range.
The cellulose long-fiber nonwoven fabric of the present invention is used as a surface material of an absorbent article. The absorbent article may include at least the surface material and the absorbent. Of course, in addition to this structure, a so-called back sheet may be provided as a leak-proof layer. The structure of a normal absorbent article includes a surface material—a diffusion layer—an absorbent material (large capacity) —a structure provided with a leak-proof layer and capable of absorbing a large amount of body fluid, urine, and the like (diaper structure), and a surface material—absorption. Material (small capacity)-simple structure of leak-proof layer, which can be broadly divided into those absorbing small amounts of body fluids and the like. In both structures of the absorbent article, when the cellulose long fiber nonwoven fabric of the present invention is used for a surface material, an extremely good effect can be obtained.

In the diaper structure, since the water transport performance is good, urine, body fluid, etc. can be transferred to the absorbent while diffusing very quickly, and the feeling of stickiness is small. In addition, a comfortable absorbent article having excellent form retention and extremely little stuffiness when worn due to the hygroscopicity of the cellulose fibers. Furthermore, since it is a cellulose fiber, skin irritation is low and safety is high. In the case of an absorbent article having a diaper structure, those having a low basis weight and good liquid permeability are preferable from the viewpoint of reducing the wet-back property and the surface liquid holding property, which are the main causes of the sticky feeling. For this reason, the basis weight is preferably 7 to 25 g / m ² , and more preferably 10 to 20 g / m ² . If it is less than 7 g / m ^2, there is a problem in the strength at the time of wearing, and if it exceeds 25 g / m ² , an uncomfortable feeling may be caused at the time of wearing in combination with the thickness of the absorbent article. Further, since there is a diffusion layer and the absorption material has a large capacity, it is preferable to have an opening in consideration of liquid transfer to the diffusion layer.

In an absorbent article having a simple structure, the liquid can be retained by the liquid retaining power of the cellulose fiber, and the water-transporting performance is good and the adhesive is diffused, so that the sticky feeling is reduced. In addition, safety such as shape retention, stuffiness, skin irritation and the like is also good as in the diaper structure. Since also liquid retaining the surface material, the basis weight is preferably 10 to 30 g / m ^2, more preferably a 15 to 30 g / m ^2. If it is less than 10 g / m ² , the liquid-retaining ability is insufficient and a sticky feeling may be generated. If it exceeds 30 g / m ² , an uncomfortable feeling may be caused when worn. In some cases, the surface material also functions as an absorbent in the absorbent article having a simple structure, and the absorbent article of the present invention includes this.
In the absorbent article of the present invention, as long as the surface material for an absorbent article of the present invention is used, a diffusion layer, an absorbent, and a leakproof layer may be appropriately selected. As the diffusion layer (second sheet), synthetic fibers, for example, an air-through nonwoven fabric of polypropylene or the like may be used. As the absorbent, a material obtained by wrapping a pulp provided with a polymer absorber with a tissue, a material obtained by attaching a polymer absorber to a tissue, or the like may be used. The leakproof layer (backsheet) should be made of, for example, a microporous sheet of polyolefin or polyester, which does not leak absorbed body fluids or urine to underwear and has a moisture-permeable and waterproof property from the viewpoint of preventing stuffiness. Can be.

The present invention will be described based on examples. The evaluation in the examples was performed using the following method.
(1) Single fineness of fibers constituting the surface and its composition ratio The single fineness is measured from the fiber diameter using the fibers constituting the surface as a circular cross section. The specific gravity of the cellulose fiber is set to 1.50. When the diameter of a single fiber is d (m), the following relationship is established with the single fineness t (dtex).
t = π (d / 2) ² × 10000 × 1.50 × 10 ⁶
Here, π is a circle ratio. At 0.1 dtex, d = 2.91 × 10 ⁻⁶ (m) = 2.91 (μm), and at 0.55 dtex, d = 6.83 × 10 ⁻⁶ (m) = 6.83 (μm).
The surface is observed with an electron microscope, and the diameter of the single fiber is measured. The observation magnification is a magnification at which a diameter of 1 μm looks like about 5 mm. Measure 200 diameters with focus. The number of fibers having a diameter in the range of 2.91 to 6.83 μm is defined as a, and the single fineness ratio of the fibers constituting the surface is determined by the following equation.
Single fineness ratio of fiber constituting surface (%) = (a / 200) × 100
(2) Wet form retention (in Table 1, expressed as Wet retention)
The measurement is performed after the measurement sample is conditioned for 24 hours at 20 ° C. and 65% RH. The measurement is performed by the above-described device and method.

(3) Horizontal water infusion rate The sample is conditioned at 20 ° C. and 65% RH for 24 hours and then measured. The measurement is performed by the above-described device and method.
(4) Rewetting (body fluid absorption)
The evaluation was performed as follows using a commercially available panty liner.
(4-1) Diaper-structured panty liner An experiment was carried out using a laurier silky cotton sheet manufactured by Kao Corporation. The experiment was performed under the conditions of 20 ° C. and 65% RH.
Hot air is applied to the surface material using a hair dryer to dissolve the hot melt adhesive, and only the surface material is peeled off. A surface material to be tested was prepared in an area approximately 1 cm larger than the absorber structure, wound around the backsheet surface and fixed to the backsheet surface (the surface in contact with the undergarment) with cellophane tape to obtain a sample for evaluating wetting back.
The weight W ₁ of the large size of the filter paper from the evaluation sample is measured. The obtained evaluation sample was placed on a glass plate, and 1 ml of water was dropped. One minute later, the filter paper is placed, and then a glass plate is placed on the plate, and a load of 2.5 kg including the glass plate is left for 1 minute while applying a load of 2.5 kg. The glass plate above the evaluation sample and the load were removed, and the weight W _{2 of} the filter paper that absorbed water was measured. The wetting return rate is calculated by the following equation.
Wetting return rate (%) = (W ₂ −W ₁ ) / 1 × 100
(4-2) Panty Liner with Simple Structure An experiment was conducted using Sarasatty Cotton 100 manufactured by Kobayashi Pharmaceutical Co., Ltd. Evaluation was performed in the same manner as in (4-1) except that the amount of water dropped on the evaluation sample was 0.05 ml.

(5) Wetability (retention of form when wet)
A polyester needle-punched nonwoven fabric (manufactured by Toyobo Co., Ltd., product name: Bolans part number: 4051N) having a basis weight of 50 g / m ² and a thickness of 0.40 mm under a load of 9.8 kPa is a lower layer, and a surface material to be tested is an upper layer. A sample having a length of 15 cm and a width of 5 cm is prepared by adhering with a double-sided tape. The nonwoven fabric and the surface material to be tested have the machine axis direction (MD direction) as the vertical direction. The sample is fixed on a glass plate with the surface material to be tested facing up using a double-sided tape. (See Fig. 3)
1 ml of water is dropped at the center of the sample, left for 1 minute, and then a glass rod having a diameter of 12 mm is slid over the sample at a speed of 5 cm / sec while applying a load of 200 g. When it reaches the end, raise the glass rod once, return it to its original position, and slide it again. After this operation was repeated 20 times, the state of the sample was observed on 10 monitors, and the samples were graded and averaged. (See Fig. 4)
Grade 5: No twist is seen at all.
Grade 4: Slightly sagging and twisting.
Grade 3: Sagging or one sharp twist is seen.
Grade 2: Sagging and two severe twists are seen.
Grade 1: The slack is severe and three or more severe twists are seen.

(6) Feeling of wear Three parts of a regenerated cellulose long-fiber nonwoven fabric (trade name: Bemliese part number PS140) manufactured by Asahi Kasei Fibers Co., Ltd., and a superabsorbent resin (acrylic acid polymer, trade name: Sunfresh part number ST-573) manufactured by Sanyo Chemical Industry Co., Ltd. 20 g / m ^{2 of a} mixed powder consisting of the above and 1 part of a polyethylene hot melt adhesive was sprayed and melted by heating to obtain a 0.20 mm thick liquid absorbing sheet (absorbing material). A backsheet (leakage-proof layer) was prepared by cutting a polyethylene microporous film (trade name: Porum part number PH50, thickness: 50 μm, basis weight: 45 g / m ² ) manufactured by Tokuyama Corporation into a commercially available panty liner shape. Next, the obtained liquid-absorbent sheet was cut out to a size slightly smaller than the backsheet, and adhesives were applied to the four corners of the surface on which the superabsorbent resin was not adhered, and attached to the backsheet. An adhesive was applied to the end of the back sheet, and a surface material (top sheet) to be tested was further placed on the back sheet so that the machine axis direction (MD direction) was the length direction, and was attached. The underside of the back sheet can be adhesively fixed to the underwear using a double-sided tape.
The obtained panty liner was worn for one day on the third day after the end of menstruation in summer, and a sensory evaluation was performed. The content of the evaluation was graded for softness, stuffiness, flexibility, fluff, stickiness, and when there was a vaginal discharge, absorptivity and stickiness. The number of monitors was evaluated by the average value of 10 persons.
Level 5: Comfortable. Or no problem.
Grade 3: I'm slightly worried. Or slightly uncomfortable.
Level 1: I am very worried. Or very uncomfortable.

[Example 1]
The cotton linter is dissolved in a copper ammonia solution, and spun in five layers continuously on a net under a flowing tension using a spinneret having a stock solution discharge hole having a diameter of 0.3 mm of 180.9 pieces / cm ^2. A sheet was formed, and through holes and recesses were formed in the sheet while the fibers were entangled by a high-pressure water flow, followed by drying to obtain a regenerated cellulose continuous continuous fiber nonwoven fabric. The resulting regenerated cellulose continuous long fiber nonwoven fabric, the area of the basis weight 18.7 g / m ^2, thickness 0.13 mm, an average single fineness of 0.20Dtex, average area 0.253Mm ² of the through hole, the through hole occupying the seat surface The ratio was 15.3%, and the ratio of single fibers of 0.1 to 0.55 dtex occupying the surface was 100%.
The performance evaluation results of the obtained regenerated cellulose continuous continuous fiber nonwoven fabric are shown in Table 1 (however, the wet form retention is abbreviated as Wet shape retention), and the function evaluation results as an absorbent article are shown in Table 2. As can be seen from the table, the obtained regenerated cellulose continuous filament nonwoven fabric was extremely good as a surface material for absorbent articles.

[Example 2]
A regenerated cellulose continuous continuous fiber nonwoven fabric was obtained in the same manner as in Example 1 except that the discharge amount of the stock solution was increased. The resulting regenerated cellulose continuous long fiber nonwoven fabric, the area of the basis weight 29.3 g / m ^2, thickness 0.22 mm, an average single fineness of 0.35Dtex, average area 0.295Mm ² of the through hole, the through hole occupying the seat surface The ratio was 14.9%, and the ratio of single fibers of 0.1 to 0.55 dtex occupying the surface was 100%. Table 1 shows the performance evaluation results of the obtained regenerated cellulose continuous continuous fiber nonwoven fabric, and Table 2 shows the function evaluation results as an absorbent article. As can be seen from the table, the obtained regenerated cellulose continuous filament nonwoven fabric was extremely good as a surface material for absorbent articles.

[Example 3]
In Example 1, the first layer and the fifth layer of the sheets to be laminated were formed by using a spout having a stock solution discharge hole having a diameter of 0.3 mm of 180.9 / cm ² , and the ^second to fourth layers having a diameter of 0.6 mm. A regenerated cellulose continuous continuous fiber nonwoven fabric was obtained in the same manner as in Example 1, except that the stock solution discharging hole of 45.3 / cm ² was used and the speed of the net for laminating the spun sheets was reduced. Was. The obtained regenerated cellulose continuous filament nonwoven fabric has a basis weight of 28.9 g / m ² , a thickness of 0.23 mm, an average single fineness of 0.20 dtex and 2.1 dtex, and an average area of the through holes of 0.283 mm ^2. The area ratio of the through-holes occupying the sheet surface was 19.4%, and the ratio of single fibers of 0.1 to 0.55 dtex occupying the surface was 73%.
Table 1 shows the performance evaluation results of the obtained regenerated cellulose continuous continuous fiber nonwoven fabric, and Table 2 shows the function evaluation results as an absorbent article. As can be seen from the table, the obtained regenerated cellulose continuous filament nonwoven fabric was extremely good as a surface material for absorbent articles.

[Comparative Example 1]
A regenerated cellulose continuous continuous fiber nonwoven fabric was obtained in the same manner as in Example 1, except that a spinneret having a stock solution discharge hole having a diameter of 0.6 mm and having a diameter of 45.3 / cm ² was used. The resulting regenerated cellulose continuous long fiber nonwoven fabric, the area of the basis weight 18.5 g / m ^2, thickness 0.13 mm, an average single fineness of 2.2 dtex, average area 0.215 mm ² of the through hole, the through hole occupying the seat surface The ratio was 19.1%, and the ratio of single fibers of 0.1 to 0.55 dtex occupying the surface was 0%.
Table 1 shows the performance evaluation results of the obtained regenerated cellulose continuous continuous fiber nonwoven fabric, and Table 2 shows the function evaluation results as an absorbent article. As can be seen from Tables 1 and 2, the obtained regenerated cellulose continuous long-fiber nonwoven fabric was used as a surface material for absorbent articles, especially when it was wet, in terms of shape retention (wet shape retention, repellency) when wet. The feeling was inferior.

[Comparative Example 2]
A regenerated cellulose continuous filament nonwoven fabric was obtained in the same manner as in Comparative Example 1 except that the discharge amount of the undiluted solution was increased in Comparative Example 1. The obtained regenerated cellulose continuous filament nonwoven fabric had a basis weight of 30.1 g / m ² , a thickness of 0.24 mm, an average single fineness of 2.1 dtex, an average area of the through holes of 0.247 mm ² , and an area of the through holes occupying the sheet surface. The ratio was 18.2%, and the ratio of single fibers of 0.1 to 0.55 dtex occupying the surface was 0%.
Table 1 shows the performance evaluation results of the obtained regenerated cellulose continuous continuous fiber nonwoven fabric, and Table 2 shows the function evaluation results as an absorbent article. As can be seen from Tables 1 and 2, the obtained regenerated cellulose continuous long-fiber nonwoven fabric was used as a surface material for absorbent articles, especially when it was wet, in terms of shape retention (wet shape retention, repellency) when wet. The feeling was inferior.

  Since the surface material for absorbent articles of the present invention has extremely good shape retention when wet, it is suitable for absorbent articles such as panty liners, incontinence pads, sanitary napkins, puerperal pads (napkins for childbirth), and disposable diapers. Available to

FIG. 1 is a schematic diagram of a wet form retention rate measuring device of the present invention. FIG. 1 is a schematic view of a horizontal water velocity measuring device of the present invention. FIG. 4 is a schematic view of a sample for evaluating repellency according to the present invention. FIG. 3 is a schematic diagram of evaluation of repellency according to the present invention.

Explanation of reference numerals

1: Stand 2: Sample holding plate (fix sample with screws between two plates)
3: Sample 4: Load (total with sample holding plate below is 30% by weight of sample weight)
5: Vertical distance 18mm
6: Sample immersion distance 12mm
7: Sample support glass rod 1.5mm
8: Support glass rod pitch 10mm
9: Surface material sample 10: Stand 11: Liquid used Shachihata stamp ink (S-1 red) aqueous solution 12: Surface material sample 13: Polyester nonwoven fabric 14: Glass plate 15: Double-sided tape 16: Glass rod (diameter 12mm)

Claims (5)

  A surface material for an absorbent article comprising a cellulose long-fiber nonwoven fabric, wherein at least 70% or more of the fibers constituting the surface of the nonwoven fabric have a single fineness of 0.1 to 0.55 dtex. Surface material.   The surface material for an absorbent article according to claim 1, wherein the wet form retention of the nonwoven fabric is 80% or more.   The surface material for an absorbent article according to claim 1 or 2, wherein the nonwoven fabric is a regenerated cellulose continuous filament nonwoven fabric.   An absorbent article comprising at least a surface material and an absorbent material, wherein the surface material is the surface material for an absorbent article according to any one of claims 1 to 3.   An absorbent article comprising at least a surface material also serving as an absorbent, wherein the surface material is the surface material for an absorbent article according to any one of claims 1 to 3.

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