JP5274636B2 - Absorbent articles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent a material tear when a pressing groove is given under a condition for using nonwoven fabric whose fineness is 1.7 dt or below as a liquid permeable top sheet. <P>SOLUTION: In a sanitary napkin 1, wherein an absorber 4 is installed between the liquid permeable top sheet 3 consisting of the nonwoven fabric and a back sheet 2, and the pressing grooves 7 and 7 are given from an external side of the liquid permeable top sheet 3, the pressing grooves 7 and 7 are set to be a pair of right and left pressing grooves formed on both sides straddling a blood discharging corresponding part to follow an almost longitudinal direction, the nonwoven fabric whose fineness is 1.7 dt or below is used as the liquid permeable top sheet 3 and a plurality of nonwoven fabrics 8 for pressing/reinforcement, whose fineness is larger than 1.7 dt, are arranged on a lower layer face side of the liquid permeable top sheet 3 and in a range including the pressing grooves 7 and 7. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads and the like for absorbing menstrual blood and vaginal discharge, and more particularly to absorbent articles using a nonwoven fabric having a fineness of 1.7 dt or less as a top sheet.

  Conventionally, as absorbent articles such as sanitary napkins, panty liners, incontinence pads, liquid-impervious backsheets such as polyethylene sheets or polyethylene laminate sheets nonwoven fabrics, and liquid-permeable top sheets such as nonwoven fabrics or liquid-permeable plastic sheets There is known an intervening absorber made of cotton-like pulp or the like.

  Many improvements have been made on this type of absorbent article, and various means for preventing body fluid leakage and the like have been taken. For example, to prevent diffusion of bodily fluids in the width direction, to prevent twisting of the absorbent body, and to raise the central portion of the absorbent body to improve adhesion to the local area, the surface is embossed by hot embossing. There is a technique for forming a groove (pressed groove).

  On the other hand, when using a non-woven fabric as the liquid-permeable top sheet, a non-woven fabric having a fineness of 2.2 dt or more is used so as to have a predetermined tensile strength, and a lotion is applied or irregularities are imparted to improve the touch feeling. Although embossing etc. were performed, the material cost and process which concern on these have generate | occur | produced. On the other hand, in recent years, non-woven fabrics using ultra fine yarn (hereinafter also referred to as fine denier nonwoven fabrics) have been developed and supplied to the market due to the development of nonwoven fabric technology. In particular, a non-woven fabric having a fineness of 1.7 dt or less has a low surface irregularity due to the high fiber density of the sheet compared to a non-woven fabric having a fineness of 2.2 dt or more, and has a good feel to the touch. When used as a top sheet, It was confirmed that the touch feeling was very good.

  However, when a fine denier non-woven fabric with a fineness of 1.7 dt or less is used, the fiber yarn is thin and the number of heat-sealed parts is reduced, so that the tensile strength in the width direction is lowered, and embossing that extends in the longitudinal direction of the napkin is given. Then, the problem that a lot of tears occurred became clear.

  Incidentally, in recent years, several techniques have been proposed for preventing the nonwoven fabric material of the liquid-permeable top sheet from being broken when the embossing treatment is performed.

  For example, in the following Patent Document 1, an absorber is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet, and the liquid-permeable surface sheet surface is long in the direction along the substantially longitudinal direction. In the absorbent article in which a pair of left and right embossed grooves is formed across the center line in the direction, a groove is formed on the bottom surface of the embossed groove that extends from the inner edge toward the outer edge and does not reach the outer edge. A technique for preventing the surface sheet from being lifted or torn by being intermittently formed in the longitudinal direction is disclosed.

  Moreover, in the following patent document 2, an absorbent body is interposed between the liquid-permeable surface sheet and the liquid-impermeable back sheet, and a longitudinal emboss groove along the substantially longitudinal direction is formed on the liquid-permeable surface sheet surface side. In addition to being formed, a width direction embossed groove is formed substantially along the width direction, and high pressure squeezed portions and low pressure squeezed portions are alternately arranged along the longitudinal direction of the grooves on the bottom surfaces of the vertical direction embossed grooves and the width direction embossed grooves. In the absorbent article, when a single line that crosses the embossed groove in the width direction is drawn, the length of the part where the transverse line contacts the pressing portion is the sum of the lengths on the transverse line. Defined as “contact line length”, and the difference between the maximum value of the contact line length in the region where the embossed groove in the width direction exists and the maximum value of the contact line length in the region where the embossed groove in the vertical direction exists is 5 mm. Prevent material tearing by ensuring that It discloses a technique.

JP 2003-265518 A JP 2003-265519 A

However, in the case of the fine denier non-woven fabric having a fineness of 1.7 dt or less, even if the break prevention technology by embossing described in Patent Documents 1 and 2 is applied, the break cannot be effectively prevented. In particular, in a napkin having a medium-high absorber that protrudes toward the use surface in the middle of the absorber, when embossing is applied to the peripheral portion of the medium-high absorber, the difference in basis weight between the medium-high absorber and the peripheral portion is 100 g / m. ^When there were ² or more and the height difference was 3 mm or more, the top sheet was pulled and the frequency of tearing was high.

  Thus, the main problem of the present invention is that the absorbent body is interposed between the liquid-permeable top sheet made of a nonwoven fabric and the back sheet, and an absorption groove is provided from the outer surface side of the liquid-permeable top sheet. It is in effectively preventing the material tear at the time of giving a pressing groove under the conditions which use a nonwoven fabric with a fineness of 1.7 dt or less as the liquid-permeable top sheet.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorbent body is interposed between a liquid-permeable top sheet made of a nonwoven fabric and a back sheet, and from the outer surface side of the liquid-permeable top sheet. In the absorbent article to which the compressed groove is given,
The compressed grooves are a pair of left and right compressed grooves formed so as to be substantially along the longitudinal direction on both side portions straddling the site for blood drainage,
As the liquid-permeable top sheet, a non-woven fabric having a fineness of 1.7 dt or less is used, and compression reinforcement with a fineness greater than 1.7 dt is included in the lower layer side of the liquid-permeable top sheet and including the compressed groove. There is provided an absorbent article characterized in that a plurality of nonwoven fabrics are disposed, and the non-woven fabric for squeezing reinforcement is formed as a two-layer nonwoven fabric by folding the both sides of one nonwoven fabric into a C-section fold. The

  In the first aspect of the present invention, a compression reinforcing nonwoven fabric having a fineness greater than 1.7 dt is disposed in the lower layer side of the liquid-permeable top sheet and including the pressing groove, and the pressing is performed. The material breakage at the time of groove grant was effectively prevented. That is, for the purpose of reinforcing a non-woven fabric having a fineness of 1.7 dt or less with a low tensile strength, a non-woven fabric having a higher tensile strength (fineness> 1.7 dt) is laminated on the lower surface side.

Particularly in this invention, the squeezing reinforcing nonwoven Upon congested disposed, Ru 2 layers of nonwoven entirety in by a C-fold section folded back sides of a sheet of nonwoven fabric before Symbol squeeze reinforcing nonwoven.

  In this type of absorbent article, a hydrophilic non-woven fabric called a second non-woven fabric may be disposed on the lower surface side of the liquid-permeable top sheet made of non-woven fabric to improve the absorbency. In this invention, a non-woven fabric having a fineness greater than that of the liquid-permeable top sheet is used as the non-woven fabric for compression reinforcement. In addition, it is different in that it is disposed in the range, particularly corresponding to the compressed groove.

As the present invention according to claim 2, wherein the compressed reinforcing nonwoven absorbent article of claim 1 Symbol placement using more than fineness 2.2dt is provided.

In the invention described in claim 2, a nonwoven fabric having a fineness of 2.2 dt or more is used as the compression reinforcing nonwoven fabric. By using a nonwoven fabric having this physical property value, it is possible to effectively prevent the material from being torn regardless of the degree of pressing.

As the present invention according to claim 3, fineness 1.7dt following nonwoven fabric used as the liquid-permeable topsheet, PET claims 1-2 with a core-sheath type composite fiber (polyethylene terephthalate) / PE (polyethylene) An absorbent article according to any of the above is provided.

In the invention according to claim 3, the nonwoven fabric having a fineness of 1.7 dt or less used as the liquid-permeable top sheet is a core-sheath type composite fiber of PET (polyethylene terephthalate) / PE (polyethylene). Non-woven fabrics with a fineness of 1.7 dt or less are extremely fine yarns, so they have poor cushioning properties and are prone to loosening, and once they are loose, they have drawbacks such as being difficult to restore. To compensate for these shortcomings, cushioning and compression It is desirable to use a PET / PE core-sheath type composite fiber excellent in restoration rate.

  As described above in detail, according to the present invention, an absorbent body is interposed between the liquid-permeable top sheet made of nonwoven fabric and the back sheet, and a pressing groove is provided from the outer surface side of the liquid-permeable top sheet. In a certain absorbent article, it becomes possible to effectively prevent material breakage when a compressed groove is provided under the condition that a nonwoven fabric having a fineness of 1.7 dt or less is used as the liquid-permeable top sheet.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. (A), (B) is a cross-sectional view which shows the example of an arrangement | positioning aspect which concerns on the layer structure of the nonwoven fabric 8 for pressing reinforcement together. It is a napkin top view (the 1) which shows the example of plane arrangement mode of nonwoven fabric 8 for pressing reinforcement. It is a napkin top view (the 1) which shows the example of plane arrangement mode of nonwoven fabric 8 for pressing reinforcement.

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

[Structural example of absorbent article]
FIG. 1 is a partially broken development view of a sanitary napkin 1 according to the present invention, and FIG. 2 is a view taken along the line II-II in FIG.

  The sanitary napkin 1 includes a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, etc., a liquid-permeable top sheet 3 made of a non-woven fabric that allows permeation of menstrual blood, cage, etc., and both the sheets 2 , 3, an absorbent body 4 made of cotton-like pulp or synthetic pulp, crepe paper 5 surrounding the absorbent body 4 for maintaining the shape of the absorbent body 4 and improving diffusibility, and both sides of the surface Are mainly composed of side nonwoven fabrics 6 and 6 formed along the longitudinal direction. Around the absorbent body 4, at the upper and lower edge portions, the outer edge portions of the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 are bonded by an adhesive such as hot melt or an adhesive means such as heat seal. In addition, the liquid-impervious backsheet 2 and the side nonwoven fabric 6 that extend laterally from the absorbent body 4 at both side edges are joined by an adhesive such as hot melt or an adhesive means such as heat seal. Has been.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
The liquid-impervious backsheet 2 is made of a sheet material having at least water shielding properties such as an olefin-based resin sheet such as polyethylene or polypropylene. A nonwoven fabric sheet (in this case, a back sheet is composed of the waterproof film and the nonwoven fabric) can be used after substantially impervious liquid impermeability by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

  Next, the liquid-permeable top sheet 3 is a porous or non-porous nonwoven fabric having a fineness of 1.7 dt or less, which is called a fine denier nonwoven fabric in the present invention. Examples of the material fibers constituting the nonwoven fabric include PP (polypropylene) / PE (polyethylene), PET (polyethylene terephthalate) / PE (polyethylene), as well as synthetic fibers such as polyethylene or polypropylene, such as olefins, polyesters, and polyamides. Core-sheath fibers such as PET (polyethylene terephthalate) / PP (polypropylene), PET / copolymerized PET, PP / copolymerized PP, composite fibers such as side-by-side fibers, split fibers, rayon, cupra, etc. Natural fibers such as recycled fibers and cotton. Among these materials, the most suitable liquid-permeable top sheet nonwoven fabric is preferably PET / PE excellent in cushioning properties and compression recovery in terms of compensating for the drawbacks of fine denier.

  As a processing method, a nonwoven fabric obtained by an appropriate processing method such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, or the like 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.

  On the other hand, on the upper surface of the liquid-permeable top sheet 3, a pair of left and right squeezing grooves 7, 7 along the substantially longitudinal direction are respectively formed on both side portions straddling the site for blood removal.

  In this sanitary napkin 1, in order to prevent the material tear of the liquid-permeable top sheet 3 when the compressed grooves 7, 7 are applied, the pressure-sensitive groove 7, In the range including 7, one or multiple layers of the non-woven fabric 8 for compressive reinforcement having a fineness larger than 1.7 dt, preferably having a fineness of 2.2 dt or more are disposed. In the example shown in FIG. 1, one compression reinforcing nonwoven fabric 8 is arranged in a range including the pair of left and right pressing grooves 7, 7. However, the two or more layers are arranged. Also good. For example, the example shown by FIG. 3 is an example which has arrange | positioned the nonwoven fabric 8 for compression reinforcement of two layers. 2A is an example in which two nonwoven fabrics are stacked and laminated, and FIG. 2B is an example in which one nonwoven fabric is folded into a C cross section to form a two-layer nonwoven fabric.

  The non-woven fabric 8 for compressive reinforcement includes, for example, synthetic fibers such as polyethylene or polypropylene such as olefin, polyester, and polyamide, as well as composite fibers such as core-sheath fibers, side-by-side fibers, and split fibers, Recycled fibers such as rayon and cupra, and natural fibers such as cotton can be used. However, when PET / PE core-sheath type composite fibers are used as the liquid-permeable top sheet, heat fusion by heat of embossing In order to fix, it is desirable to use a material having a lower melting point than PET (polyethylene terephthalate), particularly a core-sheath type composite fiber such as polyethylene or polypropylene, PE / PP or PP / PE.

  Since the non-woven fabric 8 for compressive reinforcement is not intended to absorb body fluid, there is no need to dispose it so as to include the blood drainage part H. Then, it may be divided into left and right. The example shown in FIG. 4 is an example in which the compression reinforcing nonwoven fabrics 8 and 8 are arranged separately for each pressing groove 7 and 7, and the example shown in FIG. 5 is for each pressing groove 7 and 7. And it is the example arrange | positioned along the shape of this pressing groove 7,7.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable top sheet 3 is made of, for example, fluffy pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price. When the crepe paper 5 surrounding the absorbent body 4 is provided as in this example, the crepe paper 5 is interposed between the liquid-permeable top sheet 3 and the absorbent body 4 as a result. The crepe paper 5 which is excellent in diffusing body fluids quickly prevents reversal of menstrual blood and the like.

  On the other hand, side nonwoven fabrics 6 and 6 are provided on both sides of the sanitary napkin 1 along the longitudinal direction and almost the entire length of the napkin 1, respectively. Wing-like flaps W and W are formed by a part of the liquid-impervious back sheet 2 that extends sideways and also extends sideways.

  As the side nonwoven fabric 6, a water-repellent treated nonwoven fabric or a hydrophilic treated nonwoven fabric can be used from the viewpoint of important functions. For example, if importance is placed on functions such as preventing permeation of menstrual blood or vaginal discharge, or enhancing the touch feeling, water repellent treatment coated with silicon, paraffin or alkylchromic chloride water repellent It is desirable to use a nonwoven fabric. Further, if importance is attached to the absorption of menstrual blood and the like in the wing-shaped flaps W, W, a method of polymerizing a compound having a hydrophilic group, for example, an oxidation product of polyethylene glycol, in the process of producing a synthetic fiber, , By treating with a metal salt such as stannic chloride, partially dissolving the surface to make it porous, and depositing metal hydroxides to swell or make the synthetic fiber porous, applying capillary action to make it hydrophilic It is desirable to use a hydrophilic treated non-woven fabric provided with.

[Other examples]
(1) In the above embodiment, a so-called second nonwoven fabric is not arranged, but it may be arranged between the liquid-permeable top sheet 3 and the absorbent body 4. In this case, it arrange | positions between the said nonwoven fabric 8 for compression reinforcement, and the absorber 4. FIG.
(2) In the above embodiment, only the pair of left and right squeezing grooves 7, 7 along the substantially longitudinal direction of the sanitary napkin 1 is formed, but the squeezing grooves are squeezed along the substantially width direction of the sanitary napkin 1. A groove may be included. In this case, the compression reinforcing nonwoven fabric 8 is disposed so as to include the compressed grooves along the width direction.
(3) Also, the structure of the absorbent body is a structure having a medium-high absorbent body that rises on the use surface side in the range including the blood drainage part H as well as the flat absorbent body 4 in one layer as in the above embodiment. It may be.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable top sheet, 4 ... Absorber, 5 ... Crepe paper, 6 ... Side nonwoven fabric, 7 ... Squeeze groove, 8 ... Non-woven fabric for compression reinforcement

Claims (3)

In the absorbent article in which the absorbent body is interposed between the liquid-permeable top sheet made of a nonwoven fabric and the back sheet, and compressed grooves are provided from the outer surface side of the liquid-permeable top sheet,
The compressed grooves are a pair of left and right compressed grooves formed so as to be substantially along the longitudinal direction on both side portions straddling the site for blood drainage,
As the liquid-permeable top sheet, a non-woven fabric having a fineness of 1.7 dt or less is used, and compression reinforcement with a fineness greater than 1.7 dt is included in the lower layer side of the liquid-permeable top sheet and including the compressed groove. The absorbent article is characterized in that the nonwoven fabric for compression reinforcement is formed as a two-layer nonwoven fabric by folding the both sides of one nonwoven fabric into a C-section fold . The compressed reinforcing nonwoven absorbent article of claim 1 Symbol placement using more than fineness 2.2Dt. The fineness 1.7dt following nonwoven fabric was used as a liquid permeable topsheet, PET absorbent article according to claim 1-2 with a core-sheath type composite fiber (polyethylene terephthalate) / PE (polyethylene).

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