JP2005110821A - Absorbent article and manufacturing method of absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article and a manufacturing method of the absorbent article, which do not give a user uncomfortable feeling by coloring and respond to a small-quantity production. <P>SOLUTION: An air through material is used as a base material 7a of a second sheet 7, and a coating process of applying coating liquid of 10.0 g/m<SP>2</SP>to an absorbent side face 71, which is positioned on the side of an absorbent 4 in the base material 7a, by gravure coating is performed. Then, a drying process of drying an intermediate material obtained by the coating process is performed to manufacture a second sheet 7, and an incontinence pad 1 is manufactured using the second sheet 7. The compositions of the coating liquid are methanol (solvent) of 1,000 pts.wt., copper and its compound (blue pigment) of 8.5 pts.wt., and polyvinyl alcohol (binder) of 8.5 pts.wt. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an absorbent article such as a paper diaper and a napkin, and a method for producing the absorbent article.

  Conventionally, an absorbent article that is worn on the body and absorbs body fluids such as urine is an upper layer sheet on the wearing side (upper side), a lower layer sheet on the non-wearing side (lower side), and an absorber interposed between both sheets. And has. The upper layer sheet is composed of a plurality of sheets such as a top sheet having a mounting surface corresponding to the wearer's skin, or a second sheet disposed on the lower side of the top sheet and the top sheet. It has liquid permeability to pass through. Moreover, the lower layer sheet | seat is comprised with the sheet | seat of 1 sheet or several sheets, and the absorber is comprised from the polymer and pulp which absorb a wearer's bodily fluid, or a polymer.

  Among such absorbent articles, there are those in which the top sheet or the second sheet is colored in order to give an apparent deodorizing effect or make it difficult to understand the color of urine after urination. As a colored upper layer sheet, for example, a kneaded coloring material is known, and it is possible to adjust the color density so as not to give the user unpleasant feeling.

  However, when the upper layer sheet is produced by kneading the coloring raw material, it is necessary to roughly pass through six steps: a purification step, a synthesis step, a polymerization step, a spinning step, a stretching step, and a commercialization step. For this reason, the usage-amount of the base material used as a raw material, a pigment, etc. will become large when the part adjusted in each process is included. Therefore, when such an absorbent article is produced in a small amount, the manufacturing cost is greatly increased for the number of production, so that it was not actually possible to cope with the small amount production.

  The present invention has been made in view of such conventional problems, and provides an absorbent article and a method for manufacturing the absorbent article that can be applied to small-scale production without causing discomfort to the user even when colored. The purpose is to do.

  In order to solve the above-mentioned problem, in the absorbent article according to claim 1 of the present invention, in an absorbent article comprising a liquid-permeable upper layer sheet, a lower layer sheet, and an absorber interposed between both sheets. The upper layer sheet is coated with a coating liquid containing a pigment, and the coating liquid has a blending amount N of the pigment of 1000 parts by weight of the solvent, 0 part by weight <N <10 weights. It is assumed that it is set to the range of the part.

  In the absorbent article according to claim 2, the upper layer sheet is composed of a top sheet and a second sheet disposed below the top sheet.

  In the absorbent article according to claim 3, the composition of the coating liquid is 1000 parts by weight of the solvent, 8.5 parts by weight of the pigment, and 8.5 parts by weight of the binder.

In the absorbent article according to claim 4, wherein, the coating amount Nb of the coating solution is assumed to be set in the range of ^{8g / m 2 ≦ Nb ≦ 12g} / m 2.

  Moreover, in the manufacturing method of the absorbent article according to claim 5, in the manufacturing method of the absorbent article comprising a liquid-permeable upper layer sheet, a lower layer sheet, and an absorber interposed between both sheets, The upper layer sheet is manufactured through a coating process in which a coating liquid containing a pigment is applied to a base material and a drying process in which the intermediate material obtained in the coating process is dried. The amount Na of the pigment is set in a range of 0 part by weight <Na <10 parts by weight with respect to 1000 parts by weight of the solvent.

In the method of manufacturing an absorbent article according to claim 6, wherein the coating amount of Nb the coating solution is assumed to be set in the range of ^{8g / m 2 ≦ Nb ≦ 12g} / m 2.

  In such a configuration, since the upper layer sheet is colored by coating, the number of steps required for production is reduced compared to the case of kneading the coloring raw material. It can be reduced even if it includes the amount to be adjusted.

  As the upper layer sheet, a sheet composed of a plurality of sheets, such as a sheet composed of one top sheet having a mounting surface corresponding to the wearer's skin, or a second sheet disposed below the top sheet and the top sheet. And the coating range is not particularly limited. Further, as a base material for these sheets, non-woven fabrics such as air-through, spunbond, melt blow, spunlace, airlaid and the like are used.

  As the solvent, an organic solvent such as water or methanol is used, and as the pigment, titanium oxide, copper and its compound, carbon black, or the like is used. Furthermore, as a binder, polyvinyl alcohol (PVA), ethyl vinyl alcohol (EVA), an acrylic resin, or the like is used. As the coating method, gravure coating, bar coating, blade coating, air blade coating, spray coating and the like are used, and flexo, dot coating and the like can be used for maintaining liquid permeability.

In the absorbent article and the method for producing an absorbent article according to the present invention, the upper layer sheet is colored by coating, so that the number of steps involved in the production is reduced compared with the case of kneading the coloring raw material, so that the raw material is used. Even if the usage-amount of a base material, a pigment, etc. include the part adjusted in each process, it can reduce. Therefore, there is no possibility that the manufacturing cost will be significantly increased for the number of production when producing in small quantities. Therefore, even if it colors, it can respond to a small amount production. Further, by setting the blending amount Na of the pigment in the range of 0 part by weight <Na <10 parts by weight, it is possible to eliminate discomfort to the user even if the pigment is colored. Furthermore, by setting the coating amount Nb of the coating liquid in a range of 8 g / m ² ≦ Nb ≦ 12 g / m ² , it is possible to reliably eliminate discomfort for the user.

  In order to explain the present invention in more detail, it will be described below with reference to the accompanying drawings.

  FIG. 1 is an exploded schematic longitudinal sectional view of an incontinence pad 1 according to an embodiment of the present invention. The incontinence pad 1 covers the upper layer sheet 2 on the wearing side (upper side), the lower layer sheet 3 on the non-wearing side (lower side), the absorber 4 interposed between the sheets 2 and 3, and the absorber 4. And a covering material 5.

  The upper layer sheet 2 includes a top sheet 6 having a mounting surface 61 corresponding to the wearer's skin, and a second sheet 7 disposed below the top sheet 6. Moreover, both the sheets 6 and 7 are comprised from the nonwoven fabric, and have the liquid permeability which lets a wearer's bodily fluid pass.

  The lower layer sheet 3 is composed of one sheet or a plurality of sheets, and is made of a liquid-impervious film that does not allow the body fluid of a wearer such as polyethylene to pass through, or a liquid-impervious film bonded to a nonwoven fabric or a woven fabric. Liquid materials and breathable or non-breathable materials are used.

  The absorbent body 4 is composed of a polymer and pulp that absorbs the body fluid of the wearer, or a polymer. Moreover, the coating | covering material 5 is comprised from the crepe paper or the nonwoven fabric, and has the liquid permeability which lets a wearer's bodily fluid pass.

  Hereinafter, the present invention will be described in more detail by examples based on the incontinence pad 1, but the scope of the present invention is not limited to such examples.

  Example

A coating process in which air-through is used as the base material 7a of the second sheet 7, and the coating liquid is first applied to the absorber side surface 71 located on the absorber 4 side in the base material 7a by gravure coating at 10.0 g / m ^2. I do. Next, the second sheet 7 is manufactured by performing a drying process for drying the intermediate material (the product in which the coating liquid is applied to the base material) obtained in this coating process, and the second sheet 7 is used to incontinence. Pad 1 was manufactured. The composition of the coating solution is as shown below.

  Methanol (solvent): 1000 parts by weight

  Copper and its compound (blue pigment): 8.5 parts by weight

Polyvinyl alcohol (binder): 8.5 parts by weight

  Comparative example

A coating process in which air-through is used as the base material 7a of the second sheet 7, and the coating liquid is first applied to the absorber side surface 71 located on the absorber 4 side in the base material 7a by 8.5 g / m ² by gravure coating. I do. Next, the second sheet 7 is manufactured by performing a drying process for drying the intermediate material (the product in which the coating liquid is applied to the base material) obtained in this coating process, and the second sheet 7 is used to incontinence. Pad 1 was manufactured. The composition of the coating solution is as shown below.

  Methanol (solvent): 1000 parts by weight

  Copper and its compound (blue pigment): 10 parts by weight

  Polyvinyl alcohol (binder): 10 parts by weight

  An incontinence pad 1 that was not colored as a blank was manufactured.

  Moreover, the discomfort (color) of the color of each incontinence pad 1 was visually evaluated by a plurality of monitors using artificial urine. The evaluation items are “cleanness without knowing the color of urine” and “deodorizing effect on appearance”. In addition, the evaluation value of each item is 1 “does not fit”, 2 “does not fit well”, 3 “can't say either”, 4 “matches”, 5 “very fits” The average value of the obtained evaluation values was adopted.

  Further, the absorption performance of each incontinence pad 1 was measured. This measurement was performed by the surface liquid flow measurement method and the repeated point absorption measurement method (water immersion degree).

  In the surface liquid flow measurement method, a sample is cut in the MD direction, 10 filter papers are stacked on the inclined surface of an inclined member having an inclination of 45 degrees, and the sample is attached with the one facing the skin facing up. One drop of artificial urine colored with a 10 ml pipette 1 from a height of 10 mm was dropped on the marked area, and the length of the drop flowing in the MD direction on the surface was measured.

  In the repeated point absorption measurement method, 8 filter papers are stacked, and the sample is placed with the one touching the skin facing upward, and a 10-point measurement plate is placed thereon. Then, 1 drop of colored artificial urine was dropped into each hole of the 10-point measurement version, and the number absorbed within 2 seconds was counted, and this was repeated 3 times every 3 minutes.

  The composition of the artificial urine was 2 g of urea, 0.80 g of sodium chloride, 0.08 g of calcium chloride dihydrate, 0.03 g of magnesium sulfate dihydrate, and 97.09 g of ion-exchanged water.

Table 1 shows the results of Examples, Comparative Examples, and Blanks. Regarding the comprehensive evaluation, ◯ is good, Δ is slightly bad, and X is bad.

In the examples, the overall color evaluation was good, whereas in the comparative example, the overall color evaluation was poor. Thus, in the incontinence pad 1 and the method for producing the incontinence pad 1 of this example, the blending amount Na of the pigment with respect to 1000 parts by weight of the solvent is 8.5 parts by weight in the range of 0 part by weight <Na <10 parts by weight. By setting to, discomfort to the user can be eliminated even when colored. Furthermore, it is possible to eliminate with certainty the discomfort to the user by setting the coating amount of Nb coating liquid 10.0 g / ^{m 2} in the range of ^{8g / m 2 ≦ Nb ≦ 12g} / m 2 .

  Moreover, although the fall of the absorption performance was not seen with respect to the blank in a present Example, the fall of the absorption performance was slightly seen with respect to the blank in the comparative example. Therefore, in the present embodiment, an effect of suppressing a decrease in absorption performance can be obtained at the same time.

  In this embodiment, since the upper layer sheet 2 is colored by coating, the number of manufacturing steps is reduced as compared with the case where the coloring material is kneaded. For this reason, it can reduce even if the usage-amount of the base material used as a raw material, a pigment, etc. includes the part adjusted in each process. Therefore, there is no possibility that the manufacturing cost will be significantly increased for the number of productions when small-scale production is performed. Therefore, in this embodiment, even if it is colored, it can cope with a small amount of production.

  In addition, although the present Example demonstrated the case where the coating liquid containing a pigment was apply | coated to the absorber side surface 71 of the base material 7a of the 2nd sheet | seat 7, the coating range of a coating liquid is limited to a present Example. do not have to. For example, as shown in FIG. 1, the top sheet side surface 72 located on the top sheet 6 side in the base material 7 a of the second sheet 7, the mounting surface 61 on the base material 6 a of the top sheet 6, or the side opposite to the mounting surface 61 (second A coating liquid containing a pigment may be applied to the non-mounting surface 62 located on the sheet 7 side. Even in such a case, the same effect as in the present embodiment can be obtained.

It is a model exploded longitudinal cross-sectional view of the incontinence pad which concerns on embodiment of this invention.

Explanation of symbols

1 Incontinence pad 2 Upper sheet 3 Lower sheet 4 Absorber 6 Top sheet 7 Second sheet

Claims (6)

In an absorbent article comprising a liquid-permeable upper layer sheet, a lower layer sheet, and an absorber interposed between both sheets,
The upper layer sheet is coated with a coating liquid containing a pigment, and the coating liquid has a blending amount Na of the pigment in the following range of 0 part by weight <Na <10 with respect to 1000 parts by weight of the solvent. An absorbent article characterized by being set in a weight part. The absorbent article according to claim 1, wherein the upper layer sheet is composed of a top sheet and a second sheet disposed below the top sheet. The absorbent article according to claim 1 or 2, wherein the composition of the coating liquid is 1000 parts by weight of the solvent, 8.5 parts by weight of the pigment, and 8.5 parts by weight of the binder. The coating amount Nb of the coating liquid is in the following range 8 g / m ² ≦ Nb ≦ 12 g / m ^2.
The absorbent article according to claim 1, 2 or 3, wherein In the method of manufacturing an absorbent article comprising a liquid-permeable upper layer sheet, a lower layer sheet, and an absorbent body interposed between both sheets,
The upper sheet is
While manufactured through a coating process of applying a coating liquid containing a pigment to a substrate and a drying process of drying the intermediate material obtained in this coating process,
The said coating liquid is the manufacturing method of the absorbent article characterized by the compounding amount Na of the said pigment being set to the following range 0 weight part <Na <10 weight part with respect to 1000 weight part of solvents. The coating amount Nb of the coating liquid is in the following range 8 g / m ² ≦ Nb ≦ 12 g / m ^2.
The method for producing an absorbent article according to claim 5, wherein

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