CN204237974U

CN204237974U - Nonwoven fabric, absorbent commodity and newborn child's diaper

Info

Publication number: CN204237974U
Application number: CN201390000350.7U
Authority: CN
Inventors: 小森康浩; 小平博志
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2012-06-22
Filing date: 2013-06-13
Publication date: 2015-04-01
Anticipated expiration: 2023-06-13
Also published as: JP2014025187A; WO2013191077A1; JP6273101B2

Abstract

A kind of nonwoven fabric (10), it has outstanding in the first surface side (Z1) of the side of the nonwoven fabric overlooking sheet (10) and has first protuberance (11) of inner space (11K) and give prominence to second side (Z2) with above-mentioned first surface side (Z1) opposite side and have second protuberance (12) of inner space (12K), there is the wall portion (11W) of circulus between the top (11T) of above-mentioned first protuberance (11) and the opening portion (11H) of the inner space (11K) of above-mentioned first protuberance (11), above-mentioned first protuberance (11) and the second protuberance (12) alternately configure continuously on the opticochiasmatic different directions of bowing of this nonwoven fabric (10), the hydrophily that the hydrophily ratio being positioned at the fiber of above-mentioned first surface side (Z1) is positioned at the fiber of above-mentioned second side (Z2) is low.

Description

Nonwoven fabric, absorbent commodity and newborn child's diaper

Technical field

The utility model relates to a kind of nonwoven fabric.

Background technology

In the absorbent commodities such as sanitary napkin, panty liner and disposable diaper, according to its functional development gone out the one side of sheet material be configured with ledge absorbent commodity, be configured with the absorbent commodity of striated bossing, the absorbent commodity etc. offering a large amount of aperture.

Patent Document 1 discloses and alternately configure the convex shaped part of striated and groove portion side by side and its section is the multi-layer nonwoven fabrics of half-conical (roughly semicircle) shape at the one side of sheet material.Fiber is moved because of the injection collision of gas, forms above-mentioned groove portion and convex shaped part thus.Therefore, the high and fibre density of the containing ratio of the horizontal orientation fibers in above-mentioned groove portion and weight per unit area low, and the containing ratio of the vertical orientation fibers of the sidepiece of convex shaped part high and fibre density and weight per unit area uprise.Thus, the liquid permeability in groove portion uprises, and convex shaped part becomes loose structure, suppresses liquid to keep thus, not easily produces residual liquid.In addition, the contact area of liquid and skin diminishes.

Patent Document 2 discloses a kind of fibre sheet, it has concaveconvex structure, and the top of this protuberance is hydrophobicity, and the part except top of this protuberance is lower than this top hydrophobic or have hydrophily.This fibre sheet comprises 2 layers, and lower floor comprises heat-shrinkable fiber.Raised part obtains in the following way: after utilizing embossing (emboss) to form recess, utilizes heat treatment to make the heat-shrinkable fiber of lower floor in non-embossed part generation thermal contraction, thus makes the volume on upper strata become large.And then, at the hydrophobic finish of the top coating of raised part.Liquid promptly moves from hydrophobic top to hydrophilic bottom thus, and absorbability is improved, the not easily residual liquid at top, and maintains dry sensation without adverse current.

Patent Document 3 discloses a kind of nonwoven fabric, it comprises to utilize to heat makes the thermally extensible composite fibre of length elongation and has hydrophilic gradient at thickness direction, in-plane.As the embodiment of this nonwoven fabric, the one side side disclosing nonwoven fabric is the concaveconvex shape that formed by embossing and the hydrophily in the non-embossed portion nonwoven fabric lower than embossed portion.When hot blast process, hot blast is easily by the non-embossed part that aeration is high, makes extensibility elongate fiber, and hydrophily reduces, and produces the difference of this hydrophily thus.Thus, the Liquid Residue scale of construction, the phegma scale of construction, fluid flow is made to reduce.

Prior art document

Patent document

Patent document 1: Japanese Unexamined Patent Publication No. 200825081 publications

Patent document 2: Japanese Unexamined Patent Publication 2006-183168 publication

Patent document 3: Japanese Unexamined Patent Publication 2010-168715 publication

Utility model content

The utility model provides a kind of nonwoven fabric, it has to give prominence in the first surface side of the side overlooking sheet-like nonwoven cloth and has the first protuberance of inner space and give prominence in second side with above-mentioned first surface side opposite side and have the second protuberance of inner space, there is the wall portion of circulus between the top and the opening portion of its inner space of above-mentioned first protuberance, above-mentioned first protuberance and the second protuberance alternately configure continuously on the opticochiasmatic different directions of bowing of this nonwoven fabric, the hydrophily being positioned at the fiber of above-mentioned first surface side is lower than the hydrophily of the fiber being positioned at above-mentioned second side.

Suitable reference accompanying drawing also will make above-mentioned feature of the present utility model, further feature and advantage more clear and definite based on following record.

Accompanying drawing explanation

Fig. 1 is the cut-away section stereogram of the key component of the preferred embodiment schematically showing nonwoven fabric of the present utility model.

Fig. 2 is the profilograph of the first protuberance of nonwoven fabric of the present utility model, the second protuberance and wall portion.

Fig. 3 be represent the first protuberance of nonwoven fabric of the present utility model and the arranging example of the second protuberance overlook arranging figure.

Fig. 4 is the key diagram of a preferred embodiment of the manufacture method representing nonwoven fabric of the present utility model, what Fig. 4 (1) represented the first hot blast blows situation, Fig. 4 (2) represents by blowing the fibroreticulate state of the first hot blast and figuration, and what Fig. 4 (3) represented the second hot blast blows situation.

Detailed description of the invention

The utility model relates to a kind of nonwoven fabric, and it has soft skin sense of touch and excellent resiliency, can suppress liquid diffusion that the permeability of liquid can be made again excellent, and the dry feeling on surface is improved.

Below, limit is described with reference to Fig. 1 and the preferred embodiment of 2 limits to nonwoven fabric of the present utility model.

Nonwoven fabric 10 of the present utility model is preferably applied to the surficial sheets of the such as absorbent commodity such as sanitary napkin, disposable diaper, and is preferably used towards the skin surface side of user by first surface side Z1 and absorber (not shown) side second side Z2 being configured at absorbent commodity inside uses.Below, consider the embodiment that used towards the skin surface of user by the first surface side Z1 of nonwoven fabric 10 shown in the drawings and be described, but the utility model is not interpreted as being defined in these embodiments.

As shown in Figure 1, nonwoven fabric 10 has and to give prominence at the first surface side Z1 of the side overlooking sheet-like nonwoven cloth and have first protuberance 11 of inner space 11K and give prominence at second side Z2 with first surface side Z1 opposite side and have second protuberance 12 of inner space 12K.These first protuberances 11 and the second protuberance 12 alternately configure continuously respectively on the opticochiasmatic different directions of bowing such as spreading all over whole of nonwoven fabric 10.As concrete one example, above-mentioned different direction refers to 1 direction in above-mentioned different directions and X-direction and different from this X-direction and be the Y-direction in 1 direction in above-mentioned different directions.At this, the protuberance observed from first surface side Z1 is the first protuberance 11, and recess is the second protuberance 12.In addition, the protuberance observed from second side Z2 is the second protuberance 12, and recess is the first protuberance 11.And, the space that the inner space 12K that the second protuberance 12 has is formed for observing the viewed above-mentioned recess of the second protuberance 12 from first surface side Z1, and there is the opening portion 12H open from the top of the second protuberance 12 towards first surface side Z1.The space that the inner space 11K that first protuberance 11 has is formed for observing the viewed above-mentioned recess of the first protuberance 11 from second side Z2, and there is the opening portion 11H open towards second side Z2 from the top of the first protuberance 11.First protuberance 11 and the total part of the second protuberance 12.The intersecting angle of above-mentioned x-axis and y-axis is preferably more than 30 ° and less than 90 °, is 90 ° in the present embodiment.In addition, first surface side Z1 is set to z-axis direction upper side, second side Z2 is set to z-axis direction lower side.

In the present embodiment, the first protuberance 11 and the second protuberance 12 are formed as the truncated cone shape or hemispherical making top 11T, 12T sphering.If observe in more detail, then the outstanding shape of the first protuberance 11 is roughly hemispherical, and on the other hand, the outstanding shape of the second protuberance 12 is the circular cone or the truncated cone shape that make top sphering.In addition, in the present embodiment, first protuberance 11 and the second protuberance 12 be not by the restriction of above-mentioned shape, arbitrary outstanding form, (cone shape in this description is the implication broadly comprising circular cone, the frustum of a cone, pyramid, pyramid, oblique cone etc. to be such as actually various cone shape.)。In the present embodiment, the first protuberance 11 and the second protuberance 12 remain with its appearance similar make the truncated cone shape of top sphering or hemispheric inner space 11K, 12K.

At the top of above-mentioned first protuberance 11 (hereinafter also referred to the first protuberance top.) between 11T and opening portion 11H, there is wall portion 11W.This wall portion 11W forms circulus in the first protuberance 11.In addition, at the top of the second protuberance 12 (hereinafter also referred to the second protuberance top.) between 12T and opening portion 12H, there is wall portion 12W.This wall portion 12W forms circulus in the second protuberance 12.In addition, wall portion 12W and above-mentioned wall portion 11W has.

In this said " ring-type " as long as form jointless a succession of shape when overlooking, being then not particularly limited, can be the arbitrary shape such as circle, ellipse, rectangle, polygonal when overlooking.Suitably maintain sheet material continuous state in, preferably circle or oval.And then, if describe " ring-type " with three-dimensional shape, then can enumerate the ring structure arbitrarily such as cylinder, oblique circular cylinder, cylindroid, frustoconical, crop oblique cone, crop elliptic cone, crop quadrangular pyramid, the oblique quadrangular pyramid of crop, consider from realizing continuous print sheet material state aspect, preferred cylinder, cylindroid, frustoconical, crop elliptic cone.

In addition, for the first protuberance top 11T, wall portion 11W, the second protuberance top 12T, substantially, using to the top P1 of nonwoven thickness 3 decile as the first protuberance top 11T, using pars intermedia P3 as wall portion 11W (12W), using bottom P2 as the second protuberance top 12T (with reference to Fig. 2).In addition, at the thinner thickness of the nonwoven fabric entirety of side-looking and the thicker situation of the layer thickness of nonwoven fabric, the sharp degree at each top or curvature different when, relative in section by from the first protuberance summit 11Tp to the straight line on each position of straight line 3 decile of the second adjacent protuberance summit 12Tp, can by by the first 11Tp side, protuberance summit cross line along with by rotate around the parallel line of the z-axis of the first protuberance summit 11Tp and the top of nonwoven fabric that the curved surface obtained divides is set as the first protuberance top 11T, by by the second 12Tp side, protuberance summit cross line along with by rotate around the parallel line of the z-axis of the second protuberance summit 12Tp and the bottom of nonwoven fabric that the curved surface obtained divides is set as the second protuberance top 12T, wall portion 11W (wall portion 12W) (with reference to Fig. 2) will be set as between first protuberance top 11T and the second protuberance top 12T.Or can be wall portion by the section sets forming linearity in section, by bending from wall portion, the region of sphering be set as each protuberance.And then the first protuberance 11 comprises the first protuberance top 11T and wall portion 11W, the second protuberance 12 comprises the second protuberance top 12T and wall portion 12W, and wall portion 11W and 12W has.

In addition, wall portion 11W, 12W can also be defined as the sidewall that separated by inner space 11K and inner space 12K.Specifically, be wall portion 11W, 12W by the nonwoven fabric section sets be held between the opening portion 12H of inner space 12K and the opening portion 11H of inner space 11K.Now, opening portion 12H is that the position near the second protuberance 12 side in the rib portion mode that the top 11T according to the first protuberance 11 made around the 12K of encirclement inner space is connected to each other formed links the annulus formed.Opening portion 11H is that the position near the first protuberance 11 side in the rib portion mode that the top 12T according to the second protuberance made around the 11K of encirclement inner space is connected to each other formed links the annulus formed.

The nonwoven fabric 10 with the first protuberance 11 and the second protuberance 12 arranged as described above does not have bend, and has the biconcave male structure be made up of overall continuous print curved surface.

So, above-mentioned nonwoven fabric 10 preferably has continuous print structure on direction, face." continuously " part and aperture that do not have to be interrupted should be referred to.But interfibrous minute aperture as gap is not included in above-mentioned aperture.Above-mentioned aperture is defined as such as its aperture to be equivalent to the aperture that diameter of a circle counts more than 1mm.

The fibrous material that can use in nonwoven fabric 10 of the present utility model is not particularly limited.Such as specifically can enumerate following fiber etc.Can preferably enumerate: the polyamide fibers such as polyethylene (PE) fiber, polypropylene (PP) fiber; Be used alone the fiber of the thermoplastic resins such as polyethylene terephthalate (PET), polyamide; Core-sheath-type, side by side (side by side) isostructural composite fibre of type, such as sheath composition is the fiber of polyethylene or the polyacrylic core sheath structure of low melting point.As the typical example of the fiber of this core/sheath structure, the fiber of PET (core) and PE (sheath), PP (core) and the core sheath structure such as PE (sheath), PP (core) and low melting point PP (sheath) can be enumerated.More specifically, above-mentioned formation fiber preferably comprises polyolefin series fiber, polyethylene composite fibre, the polypropylene composite materials fiber of polyethylene fiber, polypropylene fibre etc.At this, the compound composition of this polyethylene composite fibre is preferably polyethylene terephthalate and polyethylene, the compound composition of this polypropylene composite materials fiber is preferably polyethylene terephthalate and low melting point polypropylene, more specifically, PET (core) and PE (sheath), PET (core) and low melting point PP (sheath) can be enumerated.In addition, these fibers can be used alone and form nonwoven fabric, also can combinationally use two or more.

In nonwoven fabric 10, the hydrophily being positioned at the fiber of above-mentioned first surface side Z1 is lower than the hydrophily of the fiber being positioned at above-mentioned second side Z2.At this preferably: when mentioning the difference of hydrophily, not only refer to the difference of the hydrophily on the surface of first surface side Z1 and the surface of second side Z2, and inner in the thickness of sheet material, make the hydrophily of first surface side lower than the hydrophily of second side.And then also preferred hydrophilic has the gradient uprised to second side Z2 from first surface side Z1.The implication of above-mentioned gradient refers to: not only comprise the tendency that hydrophily uprises continuously, but also comprises hydrophily from first surface side Z1 to second side Z2 discontinuously or the state that uprises of multistage ground.

Above-mentioned hydrophilic degree represents with the contact angle of aqueous phase for fiber, and this contact angle is less, then represent that hydrophily is higher.At the aqueous phase of first surface side Z1 and second side Z2, more than 7 degree are preferably for the difference of the contact angle of fiber, are more preferably more than 8 degree.As the upper limit, be preferably less than 10 degree, be more preferably less than 9 degree.By making this difference for more than above-mentioned lower limit, thus make the mobility of liquid good.In addition, when mentioning the difference of above-mentioned contact angle, refer to the difference of the contact angle of the contact angle of the fiber on Z1 surface, first surface side and the fiber on Z2 surface, second side.

In addition, as aqueous phase for the contact angle of fiber being positioned at first surface near surface, from the view point of reduction residual liquid, make liquid liquid fast strikethrough, be preferably more than 74 degree, be more preferably more than 76 degree.As the upper limit, be preferably less than 80 degree.On the other hand, as aqueous phase for the contact angle of fiber being positioned at second near surface, from the view point of being suitable for introducing liquid, being preferably more than 64 degree, as the upper limit, preferably less than 73 degree, being more preferably less than 71 degree.

The assay method > of < contact angle

Contact angle measures in accordance with the following methods.

As determinator, use the automatic contact angle meter MCA-J that consonance interface science Co., Ltd. manufactures.Contact angle determination uses distilled water.The liquid measure sprayed from ink-jetting style water droplet blowing unit (the pulse injection device CTC-25 that Cluster Technology Co., Ltd. manufactures, blowing unit aperture is 25 μm) is set as 20 skin liters, water droplet is added drop-wise to directly over fiber.The situation of dropping is recorded in the high-speed recording apparatus be connected with horizontally disposed camera.From the view point of carrying out image analysis afterwards, recording apparatus is preferably being assembled with the personal computer of high-speed acquisition equipment.In this mensuration, record image every 17msec.In recorded image, the initial imagery exploitation accompanying software FAMAS (version of software is 2.6.2, parsing gimmick is sessile drop method, analytic method is θ/2 method, image processing algorithm (algorithm) is areflexia, image procossing image mode is frame (frame), threshold level (threshold level) be 200, do not carry out curvature correction) water droplet being dripped to fiber carries out image analysis, calculate face that water droplet contacts with air and the angle that fiber is formed, as contact angle.

In addition, by the first surface side fiber of test sample (taking out and the fiber that obtains from nonwoven fabric) and second side fiber from top layer with the long 1mm severing of fiber, this fiber is placed on the sample stage of contact angle meter, maintenance level, is determined at the contact angle of two different positions to this fiber of every root.In above-mentioned each position, by after the Contact-angle measurement of N=5 root to decimal point 1, the mean value (after being rounded to decimal point second) of the measured value amounting to 10 positions is defined as the contact angle at each position.Said determination is in room temperature 20.DEG C, carry out under the environment of humidity 60%, the distilled water used, working sample are preserved after more than 1 day and are re-used under above-mentioned environment.

Also preferred any position in the first protuberance 11, second protuberance 12 and wall portion 11W (12W) produces the difference of the hydrophily of this first surface side Z1 and second side Z2, at least the first protuberance 11, preferably produce the difference of above-mentioned hydrophily.Thus, if first surface side and liquid comes into contact, even if then this liquid is full-bodied liquid, also not easily make iiquid residence in the fiber of first surface side Z1, and utilize the hydrophily of the fiber uprised to second side Z2 and liquid is introduced to second side rapidly (with reference to Fig. 2 arrow a ₁~ a ₄).

This first surface side combines with above-mentioned biconcave male structure with the difference of the hydrophily of second side and has given play to following excellence effect.

Specifically, such as, if its first surface side Z1 to be configured towards skin surface side as the surficial sheets of absorbent commodity by nonwoven fabric 10, then at the top 11T of the first protuberance 11 contacted with the origination point closest to skin in nonwoven fabric 10, discharged liquid is introduced to the inner space 11K of second side fast and arrives absorber (with reference to Fig. 2 arrow a ₁, a ₂).Can residual liquid be reduced and alleviate the burden to skin thus.

In addition, because nonwoven fabric entirety is the concavo-convex formation of continuous print, therefore liquid to move and away from skin (with reference to Fig. 2 arrow b to the second protuberance 12 from the top 11T of each first protuberance 11 fast across the wall portion 11W (12W) of circulus ₁).The liquid of movement do not spread and catch by inner space 12K.Now, in the second protuberance 12 comprising wall portion, the difference of hydrophily is also utilized to be introduced to second side Z2 fast from first surface side Z1 by liquid and arrive inner space 11K or absorber (reference Fig. 2 arrow a ₃, a ₄).Make the infiltration rate of liquid improve further thus, alleviate the burden to skin.

And then, because the hydrophily of first surface side Z1 is lower than the hydrophily of second side Z2, therefore once the liquid being introduced in inner space 11K is difficult to return again, wetting thoughts and feelings can not be given to the skin contacted with the first protuberance.Equally, at second side Z2, in the second protuberance 12 contacted with absorber or middle sheet material origination point, liquid is also difficult to turn back to first surface side Z1 again, can suppress the contact of skin and liquid.

Based on above situation, nonwoven fabric of the present utility model utilizes distinctive biconcave male structure and hydrophilic interaction, thus liquid can be suppressed to spread and introduce liquid fast, effectively suppress residual liquid and withdrawing fluid, improve the dry feeling of skin side surface.

Effect as described below given play to further by the nonwoven fabric 10 illustrated in above-mentioned embodiment.

Nonwoven fabric 10 (with reference to above-mentioned Fig. 1) has excellent resiliency.

The one side of nonwoven fabric 10 not only in table of present embodiment has outstanding part but also all has outstanding part on two sides, and therefore its structure reveals distinctive resiliency.What such as always embody as line or face in the projection of the projection of striated, one side is elastic, according to the present embodiment, even if for the behavior of three-dimensional, also can follow fully and give play in two sides by putting the three-dimensional resiliency supported.In addition, owing to having the aftermentioned fiber-wall-element model in the direction of standing up towards wall portion 11W (12W), thus produce fastening figuration (コシ) at wall portion 11W (12W), there is the resiliency of the appropriateness that fiber can not be made in thickness direction avalanche.And then utilize the above-mentioned fiber-wall-element model of wall portion 11W (12W), the power even if nonwoven fabric 10 is squeezed and avalanche, its shape recovery force is also comparatively large, even if keep bale packing state, using state, also easily maintains initial cushion effect.That is, the first protuberance 11 and the second protuberance 12 not easily avalanche, also easily recovers even if deform.

Utilize the effect coming from above-mentioned comfort cushioning to keep the space of liquid with can guaranteeing a period of time, therefore, it is possible to maintain infiltration rate fast and make to put on the moderate pressure dispersion of absorber, thus reduce the phegma scale of construction from absorber.In addition, because shape recovery force is large, the stability of absorbent properties can also therefore be guaranteed.

The skin sense of touch of nonwoven fabric 10 (with reference to above-mentioned Fig. 1) is excellent.

For the nonwoven fabric 10 of present embodiment, there is in direction, two sides the first protuberance 11 and the second protuberance 12, and make its top 11T sphering.Therefore, by making the face of the first protuberance 11 side become skin surface side, thus surficial sheets and skin can be realized to there is the good skin sense of touch of soft-touch.In addition, by making the point also come in contact because of pressure during dressing increase and decrease with planar, thus make skin sense of touch good, and the shape of the surficial sheets entirety of relative pressure can be suppressed to be out of shape, in addition, easily recover shape from pressure distortion.Also there is the effect coming from above-mentioned comfort cushioning, it is combined with the dynamic action based on two sides point cantact, unique good skin sense of touch can be obtained.In addition, when accepting excretion etc., above-mentioned point cantact also can be made to play effect, realize dry and comfortable skin sense of touch.If supplement this dry and comfortable skin sense of touch (absorbefacient effect), then owing to having the aftermentioned fiber-wall-element model in the direction of standing up towards wall portion 11W (12W), thus utilize the fiber of the orientation in a thickness direction of wall portion 11W (12W) and make liquid successfully along fiber flow, and move quickly into from the second protuberance 12 absorber be configured at below nonwoven fabric 10, and utilize the difference of the hydrophily of first surface side and second side and withdrawing fluid is reduced, realize dry and comfortable skin sense of touch.In addition, making by maintaining said structure the aeration of nonwoven fabric 10 self excellent, utilizing the effect of point cantact can play the effect preventing dermatitis.

Nonwoven fabric 10 (with reference to above-mentioned Fig. 1) is excellent to excremental seizure.

In the nonwoven fabric 10 of present embodiment, the first protuberance 11 given prominence on its two sides and the respective inside of the second protuberance 12 have inner space 11K, 12K, therefore can corresponding discharged liquid, excremental physical property and in many ways by their catch deal with.Such as, if be described using the first surface side Z1 of nonwoven fabric 10 as skin surface side, then if the high and excreta that permeability is low of viscosity, so make this excreta not lodge in inner space 12K for the moment through the surficial sheets of nonwoven fabric 10, a part for moisture is absorbed by absorber (not shown) by the second protuberance 12.On the other hand, if viscosity is low and hold meable discharged liquid, so makes it mainly through the first protuberance 11, then caught at inner space 11K.In either case, the part of first colliding with skin surface is the first protuberance top 11T, the above-mentioned discharged liquid that is caught in or excreta not easily with skin contact.Thus, even if after excretion urine, feces, menses, leukorrhea, also can tackle widely and continue very good dry feeling.

(fibre density (the first protuberance < second protuberance))

On above-mentioned basis, about the fibre density of nonwoven fabric 10, preferably make the fibre density (r of the first protuberance 11 ₁) be less than the fibre density (r of the second protuberance 12 ₂).

Thus, when supplying excreta from the first surface side Z1 of nonwoven fabric, in the first protuberance 11, logical liquid resistance is lowered and makes this excreta (not shown) import to inner space 11K rapidly.In addition, meanwhile, utilize the capillary force caused by fibre density difference that liquid is moved along wall portion to the second protuberance 12.This combines with the effect of the difference based on above-mentioned hydrophily, makes liquid peel off fast from skin and arrive absorber (not shown) fast.Its result: make excreta not easily be attached to skin, can prevent user from producing rubescent, inflammation, bedsore etc.

And then, for the first protuberance 11, can not bring the sense of shouting pain skin for extruding moderately avalanche, realizing good skin sense of touch.On the other hand, the second protuberance 12 not easily avalanche, the excellent shape retention property after trapping excreta, and when shape not avalanche, resiliency is excellent and diffusion resistance that is trapping thing is excellent.

In the fibre density that this said fibre density is the immediate vicinity of the thickness of each protuberance, it is by measuring every 1mm ²number of fiber evaluate.Such as, the fibre density of above-mentioned first protuberance 11 is preferably 30/mm ²above, 50/mm is more preferably ²above, and be preferably 130/mm ²below, 120/mm is more preferably ²below.On the other hand, the fibre density of above-mentioned second protuberance 12 is preferably 250/mm ²above, 270/mm is more preferably ²above, and be preferably 500/mm ²below, 480/mm is more preferably ²below.In addition, the difference of the fibre density of the first protuberance 11 and the fibre density of the second protuberance 12 is preferably 150/mm ²above, 300/mm is more preferably ²above.This difference is more large more preferred, as the upper limit, is 700/mm ²left and right.

The assay method > of < fibre density

Fibre density can measure according to such as following method.

Use the sectility face of scanning electronic microscope to nonwoven fabric to carry out amplifying observation and (be adjusted to the multiplying power (150 ~ 500 times) can measuring 30 ~ 60 fibre profiles, the section number of fiber is measured, calculates the section number of the fiber cut off by above-mentioned sectility face in certain area).In addition, for the first protuberance 11, the center of observation is near the central authorities of layer thickness TL1 of top 11T, and for wall portion 11W (12W), the center of observation is near the central authorities of layer thickness TL3 of the immediate vicinity in sheet thickness direction.For the second protuberance, the center of observation is near the central authorities of layer thickness TL2 of top 12T.Then, every 1mm is converted into ²the section number of fiber, set it to fibre density (root/mm ²).Measure and 3 positions are carried out, using the fibre density of its mean value as this sample.Above-mentioned scanning electronic microscope can use the JCM-5100 (trade name) of NEC (strain) Inc..

(fibre density (first surface side < second side))

In addition, the fibre density (r of the first surface side Z1 of the first protuberance 11 is preferably made _11a) with the fibre density (r of second side Z2 _11b) meet r _11a<r _11brelation.Thus, flexibility and the shape maintains of this part is taken into account.For this kind of nonwoven fabric, usually be difficult to take into account these effects, but, by giving the slightly close of distinctive fiber as above, thus maintain part in this part formation malformation portions and the structure corresponding to the extruding from outside, obtain above-mentioned effect.To be illustrated, then due in the top 11T of the first protuberance second side Z2 fiber comparatively " close ", therefore relatively hard part presents arcuation and has given play to the function of bridge pier, and this first surface side Z1 is comparatively soft, on the whole in upright and outspoken and maintain sufficient flexibility, therefore soft skin sense of touch can be experienced during contact.And then, in the thick close structure of above-mentioned fiber, thick first surface side Z1 is not identical with the behavior of close second side Z2 answering pressure, think that second side Z2 that fiber overlaps densely along the shape of the first protuberance has the resiliency brought by the malformation of the first protuberance entirety, and imparting mechanism is restorative fast.

In addition, in the top 11 of the first protuberance, the fibre density of second side Z2 is higher than the fibre density of first surface side Z1, therefore combine with the difference of above-mentioned hydrophily and make body fluid move to second side Z2 rapidly, thus making the skin contacted with first surface side Z1 keep dry and comfortable.

(fiber-wall-element model of wall portion)

And then any position of fiber in the whole circumference of ring-type spreading all over wall portion 11W forming the wall portion 11W of the first protuberance 11 all has fiber-wall-element model on the direction linked by the edge part of the first protuberance top 11T and opening portion 11H.In other words, form the fiber of wall portion 11W to collect the mode generation orientation of bunchy towards the first protuberance top 11, and in the direction that it stands up, there is fiber-wall-element model.In addition, any position of fiber preferably in the whole circumference of ring-type spreading all over wall portion 12W forming the wall portion 12W of above-mentioned second protuberance 12 all has fiber-wall-element model on the direction linked by the edge part of the second protuberance top 12T and opening portion 12H.For the fiber-wall-element model of this wall portion 12W, for the part shared with above-mentioned wall portion 11W, identical with the fiber-wall-element model of wall portion 11W.Thus, easily maintain biconcave convex form, and obtain more excellent resiliency.

For general hot blast (Air through) nonwoven fabric in the past, usually when manufacturing nonwoven fabric, orientation is there is and with this state generation heat bonding in fiber on its MD direction, therefore, for the fiber of the wall portion of MD directional profile, although fiber, on it stands up direction, orientation occurs, there is orientation in fiber, therefore do not have fiber-wall-element model as above in CD directional profile on the direction orthogonal with direction of standing up.MD is also referred to as operating direction, and it is that direction is given in fibroreticulate when nonwoven fabric manufactures, and MD is the abbreviation of " Machine Direction ".Above-mentioned CD is the direction orthogonal with MD, and CD is the abbreviation of " Cross Direction ".

Above-mentioned fiber-wall-element model comprises the angle of orientation of fiber and the concept of orientation intensity.The angle of orientation of fiber represents the concept of orientation in which direction occurs its entirety of multiple fibers with various directionality, and it is by the shapes values of the aggregate of fiber.The orientation intensity of fiber is the concept of the amount representing the fiber demonstrating the angle of orientation, orientation intensity lower than 1.05 time, there is orientation hardly, when orientation intensity is more than 1.05, can think that there is orientation.But in the present embodiment, fiber-wall-element model changes according to its position.Namely, position change from the position of the state from a certain angle of orientation to the different angles of orientation during (in the fiber state strong from orientation intensity in one direction to demonstrating during the position taken by force to intensity changes different orientations), there is the weak state of orientation intensity, reached the various states such as the high state of orientation intensity by reorientation.Therefore, preferably: demonstrate between the position of the strong angle of orientation and the position demonstrating the strong angle of orientation in other directions a certain, even if the orientation intensity of fiber is weak, the angle of orientation of fiber also there occurs change, and more preferably orientation intensity is high.

If for the angle of orientation, orientation intensity and illustrate present embodiment one example, then for the curved-surface structure of the wall portion 11W of the first protuberance 11, the angle of orientation is preferably more than 50 ° and less than 130 °, be more preferably more than 60 ° and less than 120 °, orientation intensity is preferably more than 1.05, is more preferably more than 1.10.The differently-oriented directivity of the fiber of wall portion 11W is towards the direction at the center at each top, therefore embodies resiliency.In addition, when using nonwoven fabric 10 as absorbent commodity surficial sheets use, utilize the fiber-wall-element model of wall portion 11W, even if add the condition of pressure at height under, nonwoven fabric 10 also has sufficient resistance against compression, prevents the avalanche of the first protuberance 11 of nonwoven fabric 10.Thus, sufficient capture space can be guaranteed, give full play to the effect that skin contact area of sening as an envoy to diminishes, high aeration, fully catch a large amount of liquid, solid constituent, high viscosity liquid etc. and suppress to leak the effect of overflowing.

In addition, in the utility model, as long as no special restriction, be orientation angles 90 ° by the direction setting along sheet thickness direction, in the state shown in Fig. 1, Z axis (Z1-Z2) direction is orientation angles 90 °.

The assay method > of < fiber-wall-element model (angle of orientation, orientation intensity)

Fiber-wall-element model (angle of orientation, orientation intensity) can utilize following method to measure.

First, use the scanning electronic microscope JCM-5100 (trade name) of NEC (strain) society, become upper and lower mode according to making the z-axis direction in Fig. 1 sample is left standstill, print the image taken from the direction vertical with the face that sample will carry out measuring and (be adjusted to the multiplying power can measuring more than 10 fibers to be determined, 70 ~ 300 times), fiber depicted by transparent PET film-making material.Above-mentioned image is stored in personal computer, uses the nexusNewQube [trade name] of Nexus Co., Ltd. (independent (stand-alone) version) image processing software, by above-mentioned image binaryzation.Then, use fiber-wall-element model analysis program and Fiber Orientation Analysis 8.13Single software (trade name), image after above-mentioned binaryzation is carried out Fourier transformation, obtains power spectrum, obtain the angle of orientation and orientation intensity by the distribution map of sub-elliptical.

The angle of orientation represents that fiber has carried out the angle of orientation best, and orientation intensity represents the intensity of this angle of orientation.In the mensuration of wall portion and the first protuberance, the angle of orientation is more close to the value of 90 °, then representing that fiber is more orientation occurring towards the direction of the top 12T of the second protuberance 12, if the angle of orientation is 60 ~ 120 °, being then judged as that orientation occurs the top 12T of fiber orientation second protuberance 12.In addition, the value of orientation intensity is larger, then represent fiber towards more consistent.By orientation intensity be more than 1.05 situation be set to generation orientation.Be determined at 3 positions to carry out, get its mean value as the angle of orientation of this sample and orientation intensity.

Then, the dimensions of the nonwoven fabric 10 of present embodiment is described as follows.

For the thickness of sheet material, the integral thickness of nonwoven fabric 10 when side-looking is set to sheet thickness TS, the local thickness of the sheet material bent at its concavo-convex place is set to layer thickness TL (with reference to Fig. 1).Sheet thickness TS suitably regulates according to purposes, when being used as the surficial sheets of diaper, physiological articles etc., being preferably 1mm ~ 7mm, being more preferably 1.5mm ~ 5mm.By sheet thickness TS is set in this scope, thus body fluid absorption speed during use is fast, suppresses from absorber withdrawing fluid, can also realize the resiliency of appropriateness.Layer thickness TL can each position in sheet material different, suitably regulate according to purposes.When being used as the surficial sheets of diaper, physiological articles etc., the layer thickness TL1 of the first protuberance top 11T is preferably 0.1mm ~ 3mm, is more preferably 0.4mm ~ 2mm.For the scope of preferred layer thickness, the layer thickness TL2 of the second protuberance top 12T and the layer thickness TL3 of wall portion 11W (12W) is also identical.The relation of each layer thickness TL1, TL2, TL3 is preferably TL1>TL3>TL2.Thus, in the first protuberance 11, especially in skin surface side, fibre density is lower, can realize good skin sense of touch.On the other hand, the fibre density of the second protuberance 12 uprises, not easily avalanche, can make the good and nonwoven fabric of the infiltration rate excellence of liquid of resiliency under the prerequisite of not failure mode.

The interval of above-mentioned first protuberance 11 and the second protuberance 12 suitably regulates according to purposes, when being used as the surficial sheets of diaper, physiological articles etc., being preferably 1mm ~ 15mm, being more preferably 3mm ~ 10mm.In addition, the weight per unit area of above-mentioned nonwoven fabric 10 is not particularly limited, and is preferably 15 ~ 50g/m in the mean value of sheet material entirety ², be more preferably 20 ~ 40g/m ².

Then, with reference to Fig. 3, the arranging example of preferably overlooking of the first above-mentioned protuberance 11 and the second protuberance 12 is described.

As shown in Figure 3, in arranging example, outstanding the first protuberance 11 of the first surface side Z1 (the nearby side towards Fig. 3) of the side overlooking sheet-like nonwoven cloth and outstanding the second protuberance 12 of second the side Z2 (rear side towards Fig. 3) with first surface side Z1 opposite side by be alternately configured in continuously as whole the ground spreading all over nonwoven fabric 10 bow opticochiasmatic different directions, all directions of first direction X and second direction Y.Therefore, if along 1 direction, then the first protuberance 11 and the second protuberance 12 are outstanding in direction contrary each other for sheet face.The angle of the crossing of first direction X and second direction Y be preferably more than 30 ° and 90 ° (orthogonal) below, be such as 90 °.Be configured in the mode outstanding at second side Z2 with the second protuberance 12 of first protuberance 11 equivalent amount of giving prominence at first surface side Z1.And, define the first rib portion 16 linked by the first adjacent separately protuberance 11.On the other hand, although do not illustrate, from second side Z2, define the second rib portion 17 linked by the second adjacent separately protuberance 12.

The formation of inner space 11K, 12K is the discontinuous in fact space be separated out for border and by wall portion 11W, 12W with the first rib portion 17 of rib portion 16, second." rib portion " should refer to have and combine closely in the boundary line in 2 faces of section convex, now, the first rib portion 16 becomes the cross part (boundary line) in the face of the inner space 12K of the second adjoined protuberance 12.In other words, refer to across the second protuberance 12, along from the first adjacent protuberance 11 according to surrounding the mode of this second protuberance 12 by arriving the part of the crest line of another first protuberance 11B between the second protuberance 12." crest line " should refer to: relative in the vertical direction vertical section that line connected to each other for the top 11T of the first nearest protuberance 11 is seen continuously, position the highest highly is connected continuously and the line that obtains.

In the nonwoven fabric 10 of above-mentioned arranging example, the first protuberance 11 connects across the first rib portion 16, between this series of first protuberance 11, connect the first protuberance 11 side by side across the first rib portion 16.And then, between a series of first protuberance 11 and other a series of first protuberance 11, be connected the second protuberance 12 side by side.Based on such configuration, thus there is between a series of first protuberance 11 capture space (the inner space 12K of the second protuberance).In addition, this capture space becomes liquid mobile route, and it is excessive that a series of first protuberance 11 prevents the transverse direction of liquid from leaking.In addition, even if at second side Z2, the second protuberance 12 also can connect across the second rib portion 17, between this series of second protuberance 12, have inner space 11K.

In above-mentioned arranging example, when the angle of the crossing of first direction X and second direction Y is 60 °, produce the first protuberance 11 each other and the second protuberance 12 state adjacent to each other.But, as long as be formed in continuous print sheet state on the whole, then the assortment of this form also along as opticochiasmatic different directions of bowing, all directions of first direction X and second direction Y alternately configure the first protuberance 11 and the second protuberance 12, in the implication arranged with being therefore comprised in the first protuberance 11 and the second protuberance 12 " replacing " continuously.

Be arranged on respectively as described above and overlook the first protuberance 11 in first direction (X-direction) and second direction (Y-direction) and the second protuberance 12 and at curved surface and all form nonwoven fabric 10 under continuous print state.In addition, the arrangement form of above-mentioned first protuberance 11 and the second protuberance 12 is not subject to above-mentioned restriction, as long as the form that can configure with continuable arrangement.It can be such as centered by the first protuberance 11 and at apex configuration 6 second protuberances 12 of 6 dihedrals and the arrangement expanded in face of this pattern.In addition, also can be centered by the first protuberance 11 and at foursquare apex configuration 4 the second protuberances 12, and then the center between each summit configures the second protuberance 12 respectively, and configuration amounts to 8 the second protuberances 12, and the arrangement that this pattern is expanded in face.

Then, for a preferred embodiment of the manufacture method of above-mentioned nonwoven fabric 10, limit is described as follows with reference to Fig. 4 limit.

As long as the manufacture method of above-mentioned nonwoven fabric 10 suitably adopts general manufacture method.

As an example of the supporter of manufacturing installation, use the supporter 110 of the formation shown in Fig. 4 (1).This supporter 110 has the multiple projections 111 corresponding with the position of imparting second protuberance 12 shape, and is configured with the hole 112 corresponding with the position of giving the first protuberance 11 shape.That is, supporter 110 has concaveconvex shape, and projection 111 is alternately configured in different directions from hole 112, and such as, projection 111 and hole 112 are alternately configured in X-direction and Y-direction respectively.

When above-mentioned supporter 110 configuring net (also referred to as fiber web) 50 and blows the first hot blast W1 towards net 50, as shown in Fig. 4 (2), give the first protuberance 11 shape accordingly with the hole 112 of supporter 110, and give the second protuberance 12 shape accordingly with the position of projection 111.Therefore, give prominence at the first surface side Z1 overlooking side and there is first protuberance 11 of inner space 11K and to give prominence to from second side Z2 of first surface side Z1 opposite side and second protuberance 12 with inner space 12K is alternately configured in bow opticochiasmatic different X-direction and Y-direction respectively continuously, thus giving the first sheet material 11 shape.Now, compared with corresponding to the second protuberance 12 of projection 111 in addition figuration, corresponding to hole 112 along the fibre density step-down of the flow direction of hot blast W1 in addition the first protuberance 11 of figuration.

In addition, reference arrow schematically shows the flow direction of the first hot blast W1.

If enumerate a concrete example of this manufacture method, then can be listed below described mode.

Net 51 before heat bonding and net 52 are supplied to from carding machine (not shown) device net being carried out to figuration in the mode reaching the thickness of regulation respectively.In the manufacturing apparatus, first, above-mentioned net 51 and net 52 to be transported on above-mentioned supporter 110 and to make it fix (following, the duplexer of stacked state to be called net duplexer 50 or net 50) with stacked state.Using supporter 110 side of net 51 as above-mentioned size enlargement apparatus, and on this net 51 cascade net 52.Net 51 becomes the first surface side of the nonwoven fabric 10 after figuration.

Net 51 and net 52 be by above-mentioned fibrous material formed form nonwoven fabric before fiber assembly, it is in the state that fiber is very loosely wound around each other.In addition, net 51 and net 52 are the nets having hydrophilic agent in the surface attachment of above-mentioned fibrous material.

As above-mentioned hydrophilic agent, the hydrophilic agent used in this kind of article can be used in arbitrarily.Include, for example various surfactant as typical case, the surfactant etc. of anionic property, cationic, amphion and nonionic can be used.

As the combination of preferred surfactant or surfactant, can enumerate: potassium alkyl phosphate; Polyoxyethylene alkylamide and alkyl betaine; Potassium alkyl phosphate and alkyl sulfonic acid ester sodium salt; Polyoxyethylene alkyl amine and polyglycereol monoalkyls; Polyoxyethylene alkylamide and stearoyl phosphate kalium salt; Polyoxyethylene alkylamide and polyglycereol monoalkyls; Alkyl sulfonic acid ester sodium salt and stearoyl phosphate kalium salt; Alkyl ether sulphate sylvite and polyglyceryl fatty acid ester; Polyoxyethylene alkylamide and dialkyl sulfosuccinates sodium salt; Polyoxyethylene polyoxypropylene modified silicone and dialkyl sulfosuccinates; Polyglyceryl fatty acid ester and dialkyl sulfosuccinates sodium salt; Sorbitan acid anhydride fatty acid ester and dialkyl sulfosuccinates sodium salt; Polyoxyethylene alkylamide and polyglyceryl fatty acid ester; Polyoxyethylene alkylamide and sorbitan acid anhydride fatty acid ester; Polyoxyethylene alkyl amine and sorbitan acid anhydride fatty acid ester; Polyoxyethylene polyoxypropylene modified silicone and polyoxyethylene alkyl ether; Polyoxyethylene polyoxypropylene modified silicone and polyglyceryl fatty acid ester; Polyoxyethylene polyoxypropylene modified silicone and sorbitan acid anhydride fatty acid ester; Sorbitan acid anhydride fatty acid ester and polyoxyethylene alkyl ether; Polyglyceryl fatty acid ester and sorbitan acid anhydride fatty acid ester; Polyglyceryl fatty acid ester and polyoxyethylene alkyl ether etc.As long as the combination of these preferred surfactants and preferred surfactant comprises these surfactants, other surfactant etc. also can be comprised further.

Net 51 and net 52 can make hydrophily different in advance, or utilize follow-up hot blast process to make hydrophily different.

The multiple different fiber assembly of hydrophily that made in advance can be combinationally used.In addition, even if use same fibrous material, also can become the different fiber assembly of above-mentioned hydrophily by the different hydrophilic agent of attachment, the low non-ionic surface active agent etc. of hydrophily such as can be made to be attached to net 51, and the anion surfactant etc. making hydrophily high is attached to net 52.Now, also can by other hydrophilic agent and above-mentioned hydrophilic agent used in combination in the lump.

On the other hand, utilize if want the hot blast process of subsequent handling to make net 51 different with the hydrophily of net 52, then make when net 50 is made nonwoven fabric 10 lateral deviation becoming first surface contain thermally extensible fiber on ground, can make 51 different with the hydrophily of net 52 thus.This be due to: by utilizing hot blast to make thermally extensible fiber extend, thus hydrophily is reduced.In addition, above-mentioned thermally extensible fiber " partially existing " refers to that the first surface side in nonwoven fabric 10 contains the form of thermally extensible fiber more than second side, the region containing thermally extensible fiber can be there is, the form etc. reduced second side the interrupted or multistage of the form that the content comprising above-mentioned thermally extensible fiber reduces gradually from first surface side direction second side, the content of above-mentioned thermally extensible fiber.Typical case, can enumerate: make net 51 containing thermally extensible fiber and make the form of net 52 not containing thermally extensible fiber; Make net 51 than the form etc. of net 52 more containing thermally extensible fiber.At least, the thermally extensible fiber in net 51 containing proportional be preferably more than 30%, be more preferably more than 50%.By making this containing proportional for more than above-mentioned lower limit, thus the contact angle of the fiber of the first surface side Z1 of the nonwoven fabric 10 being formed at net 51 is made to become large, hydrophily step-down, therefore preferably.Thus, hot blast process can be utilized to make net 51 different with the hydrophily of net 52.

Above-mentioned thermally extensible fiber is the fiber that its length is extended because of heating, include, for example utilize heating that the crystalline state of resin is changed and the sheath-core type conjugate fiber that spontaneously extends etc. (hereinafter referred to as thermally extensible composite fibre.)。Preferred thermally extensible composite fibre has the first resinous principle forming core and the second resinous principle comprising polyvinyl resin forming sheath portion, and the first resinous principle has the fusing point higher than the second resinous principle.First resinous principle is the composition of the thermally extensible embodying this fiber, and the second resinous principle is the composition embodying thermal bonding.As long as form second resinous principle in sheath portion be present in continuously in the longitudinal direction fiber surface at least partially.

Use differential scanning type calorimeter (Seiko Instruments Inc. DSC6200), with programming rate 10 DEG C/min, thermal analyses is carried out to fine the fiber sample (example weight 2mg) cut out, measure the melting peak temperature of each resin, and define the fusing point of the first resinous principle and the second resinous principle with this melting peak temperature.When the fusing point of the second resinous principle cannot utilize the method clearly to measure, this resin is defined as " resin without fusing point ".Now, the molecule as the second resinous principle starts the temperature flowed, and the temperature the second resinous principle being thermally bonded to the degree of the hot sticky joint strength can measuring fiber is set to softening point, and uses this softening point to replace fusing point.

First resinous principle and the second resinous principle have following orientation index value respectively, by heating, thermally extensible composite fibre are extended thus.Orientation index is as the index of the degree of orientation of the macromolecular chain of the resin of formation fiber.

The preferred orientation index of the first resinous principle in thermally extensible composite fibre naturally can be different because of the difference of used resin, such as when acrylic resin, orientation index is preferably less than 60%, is more preferably less than 40%, and more preferably less than 25%.When the first resinous principle is polyester, orientation index is preferably less than 25%, is more preferably less than 20%, and more preferably less than 10%.On the other hand, the orientation index of the second resinous principle is preferably more than 5%, is more preferably more than 15%, and more preferably more than 30%.

When the birefringent value of the resin in thermally extensible composite fibre being set to A and the intrinsic birefringent value of resin being set to B, the orientation index of the first resinous principle and the second resinous principle represents by following formula (1).

Orientation index (%)=A/B × 100 (1)

Intrinsic birefringence refers to the birefringence under the state of the macromolecular chain of resin after complete orientation, and the representational plastic material used in the first edition that its value is described in such as " plastic material (Japanese original text: " formed machining To おけ Ru plastic material ") in formed machining ", subordinate list formed machining (compile, SIGMA publishes, distribution on February 10th, 1998 by plastics forming processing association.

Polarization plates is installed on interference microscope, and measures the birefringence of thermally extensible composite fibre under relative to the parallel direction of fiber axis and the polarised light of vertical direction.As maceration extract, use the standard refraction liquid of Cargille Inc..The refractive index of maceration extract utilizes Abbe refractometer to measure.The interference fringe image of the composite fibre obtained by utilizing interference microscope, the computational methods recorded according to following document obtain refractive index that is parallel with fiber axis and vertical direction, the difference of both calculating and birefringence.

" fibre structure in the high-speed spinning of sheath-core type conjugate fiber forms (Japanese original text: " Xin Qiao Xing Complex He Xian Victoria high speed Spinning yarn To ゎける Xian Victoria Agencies appearance one-tenth ") " the 408th page (fiber association periodical, Vol.51, No.9, nineteen ninety-five)

As the thermally extensible composite fibre of above-mentioned core-sheath-type, can be the core-sheath-type of same core pattern, also can be the core-sheath-type of core shift type, can also be type side by side, is preferably the core-sheath-type with core pattern.

The second resinous principle forming sheath portion contains polyvinyl resin.The polyvinyl resin forming sheath portion is responsible for following effect: give thermal bonding to sheath-core type conjugate fiber, and introduce above-mentioned hydrophilic agent when heat treatment.As above-mentioned polyvinyl resin, low density polyethylene (LDPE) (LDPE), high density polyethylene (HDPE) (HDPE), straight-chain low density polyethylene (LDPE) (LLDPE) etc. can be used, but preferred density is 0.935 ~ 0.965g/cm ³high density polyethylene (HDPE).In addition, form the resinous principle in sheath portion and be preferably polyvinyl resin one matter, also can with other mixed with resin.As other mixed resin, acrylic resin, EVAc (EVA), ethylene-vinyl alcohol copolymer (EVOH) etc. can be enumerated.Wherein, for forming the resinous principle in sheath portion, more than the 50 quality % in the resinous principle in preferred sheath portion, particularly preferably 70 ~ 100 quality % are polyvinyl resin.

The crystallite dimension forming the polyvinyl resin in sheath portion is preferably if crystallite dimension is above, then when heat treatment, hydrophilic agent easily enters into inside from fiber surface, and the range of choice of the hydrophilic agent used also broadens.Thus, the hydrophily of the desired area of this fiber or the net using this fiber to obtain or nonwoven fabric etc. can be easily made to reduce.

From the view point of the change of water-wetness reliably producing fiber surface, crystallite dimension is preferably be more preferably the above-mentioned higher limit of crystallite dimension viewpoint according to the mechanical properties such as TENSILE STRENGTH, elongation at break is determined.As long as crystallite dimension is within, then the quantity of crystallization can not tail off, and mechanical properties also can not reduce.

(assay method of the crystallite dimension of polyvinyl resin)

Crystallite dimension is by the half breadth utilizing powder X-ray diffractometry to record, the value gone out by Sherrer formulae discovery.About computational methods, use the RINT-2500 of Inc. of science, for the peak of the facial index (110) of PE, utilize attached crystallite dimension calculation procedure JADE6.0 to calculate.Concrete condition is as follows: as radiogenic CuK alpha ray (wavelength 0.154nm), electromotive force and electric current be 40kV120mA, sweep speed is 10 °/minute.The method to set up of sample during mensuration is as follows: stretch according to the mode that the length direction of the slit with sample fixed mount is parallel and install fibre bundle, and makes fibre bundle vertical with the incident direction of X-ray.

Core is the part of sheath-core type conjugate fiber being given to intensity, as the first resinous principle forming core, can use the resinous principle that fusing point is higher than polyvinyl resin with no particular limitation.Include, for example: the polyolefin-based resins (except polyvinyl resin) such as polypropylene (PP); The polyester based resins etc. such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) (PBT).And then, the copolymer etc. of polyamide-based polymer, two or more above-mentioned resinous principle can also be used.

In these combinations, polypropylene (PP) or polyethylene terephthalate (PET) is preferably used.Also re-use after various kinds of resin can being mixed, now, the fusing point of core is set as the fusing point of the resin that fusing point is the highest.

In addition, from the aspect easily manufacturing nonwoven fabric, the fusing point of the first resinous principle of formation core is preferably made to be more than 20 DEG C with the difference (the former the latter) of the fusing point of second resinous principle in formation sheath portion.The difference of fusing point is preferably within 150 DEG C.

In this Production Example, then the first hot blast W1 (state of Fig. 4 (1) is blowed to the net duplexer 50 on this supporter 110.)。That is, from the side becoming second of nonwoven fabric 10, first hot blast W1 is blowed to net duplexer 50.Then, in the mode of the shape along supporter 110 by the net duplexer 50 figuration (state of Fig. 4 (2).)。If consider the general fibrous material for this kind of goods, then the temperature of the first hot blast W1 now preferably lower 0 DEG C than the fusing point of the thermoplastic fibre forming net duplexer 50 ~ 70 DEG C, more preferably low 5 DEG C ~ 50 DEG C.The wind speed of the first hot blast W1 is also decided by the height of the projection 111 of supporter 110, from the view point of plastic property and feel, is set as 20 ~ 150m/s, is preferably set to 30 ~ 100m/s.If wind speed is slower than this lower limit, then cannot carry out figuration fully, resiliency, the excremental effect stockpiling (stock) property and aeration cannot be given full play to.If wind speed exceedes this higher limit, then produce perforate at the top 12T of the second protuberance 12, easy avalanche, cannot give full play to the effect of resiliency, excremental stockpiling property and aeration.And then excreta is easily refluxed by this aperture portion.

Thus, be concaveconvex shape by net duplexer 50 figuration.

In addition, the height of the projection 111 of supporter 110 suitably can be determined according to the thickness of sheet material entirety of institute's figuration, the layer thickness of sheet material.Such as be set as 1mm ~ 10mm, be preferably set to 2mm ~ 8mm, be more preferably set as 2mm ~ 8mm.

Then, as shown in Fig. 4 (3), blow the second hot blast W2 of the temperature that each fiber moderate-heat of net duplexer 50 can be made bonding, make fiber thermally bonding.Now, also in the same manner as the first hot blast W1, from the side becoming second of nonwoven fabric 10, second hot blast W2 is blowed to net duplexer 50.If consider the general fibrous material for this kind of goods, then the temperature of the second hot blast W2 now preferably exceeds more than 0 DEG C and the scope of less than 70 DEG C than the fusing point of the thermoplastic fibre forming net duplexer 50, more preferably exceeds more than 5 DEG C and the scope of less than 50 DEG C.

The wind speed of the second hot blast W2 is also decided by the height of the projection 111 of supporter 110, is set as more than 1m/s and below 10m/s, is preferably set to more than 3m/s and below 8m/s.If the wind speed of this second hot blast W2 is excessively slow, then cannot conduct heat to fiber, fiber each other cannot heat bonding and make concaveconvex shape fixedly become insufficient.On the other hand, if wind speed is too fast, then owing to carrying out excessive heat transfer to fiber, therefore there is the tendency that feel is deteriorated.

As thermoplastic fibre, above-mentioned fiber can be used.Such as, use comprise low melting point composition and high-melting-point composition composite fibre as thermoplastic fibre time, more than the fusing point of low melting point composition is preferably to the temperature of the second hot blast W2 that net duplexer 50 blows and lower than the fusing point of high-melting-point composition.Be more preferably more than the fusing point of low melting point composition and the temperature of lower than the fusing point of high-melting-point composition 10 DEG C, further the preferred fusing point than low melting point composition high more than 5 DEG C and the temperature of lower than the fusing point of high-melting-point composition more than 20 DEG C.

Nonwoven fabric 10 is made according to mode discussed above.By making hot blast pass through from the part in hole 112, thus make the fiber of net move and make the convex shaped part of institute's figuration become the first protuberance 11 of nonwoven fabric 10, the convex shaped part along jut 111 formation becomes the second protuberance 12 of nonwoven fabric 10.And the face of the downside in Fig. 4 is first surface side, the face of its opposition side becomes second side.That is, the first surface side in nonwoven fabric 10 is the side being configured at above-mentioned supporter, and second side is the side blowing above-mentioned hot blast.

If consider continuous seepage, then above-mentioned manufacture method can be listed below form: manufacturing installation (not shown) adopts conveyor type or the drum type device that can carry above-mentioned supporter 110, after being peeled off from supporter by the first sheet material 11 that supporter is fixed with concaveconvex shape, coil into roll (not shown).

In above-mentioned manufacture method, the thickness of each sheet material is suitably determined according to the height of projection 111 and wind speed.Such as, if make the height of projection 111 uprise, then the thickness of sheet material is thickening, if make the height step-down of projection 111, then and the lower thickness of sheet material.On the other hand, if wind speed is accelerated, then the thickness of sheet material is thickening, if wind speed is slack-off, then and the lower thickness of sheet material.In addition, if the height of projection 111 uprises, then the fibre density step-down of sheet material, if the height step-down of projection 111, then the fibre density of sheet material uprises.On the other hand, if wind speed is accelerated, then the fibre density step-down of sheet material, if wind speed is slack-off, then the fibre density of sheet material uprises.

Under above-mentioned arbitrary wind friction velocity, by making hot blast by the hole 112 of supporter 110, all can make net duplexer 50 while figuration, become the large state of fiber volume.Especially the fiber supporting the net 51 on side can be subject to the impact of the bias current of hot blast and be in thicker fibre density state.

And then, when adopting by making net 51 give the method for hydrophily difference containing thermally extensible fiber, utilizing the thermal stretching of fiber and making the fiber spacing of this part from broadening, being in thicker fibre density state.Thus, the fibre density (r of the first surface side Z1 of the first protuberance 11 _11a) with the fibre density (r of second side Z2 _11b) meet r _11a<r _11brelation.

Nonwoven fabric of the present utility model has soft skin sense of touch and excellent resiliency, and has given play to the excellent effect that liquid diffusion can be suppressed to make again the permeability of liquid excellence, soft stool adhesion amount be reduced, the dry feeling on surface is improved.

On the other hand, in the nonwoven fabric disclosed in patent document 1 in the past, because the fibre density of convex shaped part is larger than groove portion, the liquid therefore lodging in groove portion not easily moves to convex shaped part effluent, existing problems in raising liquid Negotiation speed.In addition, groove portion is the striated along convex shaped part, therefore easily makes liquid spread.And then be not easy to utilize pressure when dressing to make convex shaped part avalanche, therefore resiliency is low.

In addition, the fibre sheet disclosed in patent document 2 is in the past the concaveconvex shape of the only one side utilizing embossing to be formed, and protuberance is filled up to bottom with fiber and does not have inner space, and liquid permeability is poor.

And then the nonwoven fabric disclosed in patent document 3 is in the past the concaveconvex shape of the only one side utilizing embossing to be formed, protuberance is filled up to bottom with fiber and does not have inner space, and liquid permeability is poor.

Nonwoven fabric 10 of the present utility model can also be used for various uses in addition.Such as can be suitable as adult with or the disposable diaper of newborn child, sanitary napkin, panty liner, the surficial sheets of getting the absorbent commodities such as diaper use.And then, the excellences such as the deformation characteristic when two sides because of nonwoven fabric 10 is concaveconvex structure and makes aeration, liquid diffusibility, extruding force, thus also can as uses such as the coating sheet materials of the sublayer be held between the surficial sheets of diaper, physiological articles etc. and absorber (sublayer), absorber (core wrap sheet (core bag sheet)).In addition, also can enumerate as the surficial sheets of absorbent commodity, pleat portion (gather), outer load, wing (wing) and the form be used.And then, also can list the coating sheet material as toilet paper sheet, cleaning sheet, filter, heating tool and the form be used.

About above-mentioned embodiment, further disclose following nonwoven fabric etc.

<1> nonwoven fabric, it has to give prominence in the first surface side of the side overlooking sheet-like nonwoven cloth and has the first protuberance of inner space and give prominence in second side with above-mentioned first surface side opposite side and have the second protuberance of inner space, there is the wall portion of circulus between the top and the opening portion of its inner space of above-mentioned first protuberance, above-mentioned first protuberance and the second protuberance alternately configure continuously on the opticochiasmatic different directions of bowing of this nonwoven fabric, the hydrophily being positioned at the fiber of above-mentioned first surface side is lower than the hydrophily of the fiber being positioned at above-mentioned second side.

The nonwoven fabric of <2> according to above-mentioned <1>, wherein, inner in the thickness of sheet material, the hydrophily of above-mentioned first surface side is lower than the hydrophily of above-mentioned second side.

The nonwoven fabric of <3> according to above-mentioned <1> or <2>, it has the gradient that hydrophily uprises from above-mentioned second side of above-mentioned first surface side direction.

The nonwoven fabric of <4> according to any one of above-mentioned <1> ~ <3>, wherein, the aqueous phase of above-mentioned first surface side is more than 7 degree and less than 10 degree for the contact angle of fiber and the aqueous phase of above-mentioned second side for the difference of the contact angle of fiber.

The nonwoven fabric of <5> according to any one of above-mentioned <1> ~ <4>, wherein, the aqueous phase of above-mentioned first surface side is more than 8 degree and less than 9 degree for the contact angle of fiber and the aqueous phase of above-mentioned second side for the difference of the contact angle of fiber.

The nonwoven fabric of <6> according to any one of above-mentioned <1> ~ <5>, wherein, aqueous phase is more than 74 degree and less than 80 degree for the contact angle of the fiber being positioned at above-mentioned first surface near surface.

The nonwoven fabric of <7> according to any one of above-mentioned <1> ~ <6>, wherein, aqueous phase is more than 64 degree and less than 73 degree for the contact angle of the fiber being positioned at above-mentioned second near surface.

The nonwoven fabric of <8> according to any one of above-mentioned <1> ~ <7>, wherein, the fibre density (r1) of above-mentioned first protuberance is lower than the fibre density (r2) of above-mentioned second protuberance.

The nonwoven fabric of <9> according to any one of above-mentioned <1> ~ <8>, wherein, the fibre density of above-mentioned first protuberance is 30/mm ²above and 130/mm ²below.

The nonwoven fabric of <10> according to any one of above-mentioned <1> ~ <9>, wherein, the fibre density of above-mentioned second protuberance is 250/mm ²above and 500/mm ²below.

The nonwoven fabric of <11> according to any one of above-mentioned <1> ~ <10>, wherein, the difference of the fibre density of above-mentioned first protuberance and the fibre density of above-mentioned second protuberance is 150/mm ²above.

The nonwoven fabric of <12> according to any one of above-mentioned <1> ~ <11>, wherein, any position of fiber in the whole circumference of ring-type spreading all over wall portion forming the wall portion of above-mentioned first protuberance all has fiber-wall-element model on the direction linked by the edge part at above-mentioned first protuberance top and above-mentioned opening portion.

The nonwoven fabric of <13> according to any one of above-mentioned <1> ~ <12>, wherein, any position of fiber in the whole circumference of ring-type spreading all over wall portion forming the wall portion of above-mentioned second protuberance all has fiber-wall-element model on the direction linked by the edge part at above-mentioned second protuberance top and above-mentioned opening portion.

The nonwoven fabric of <14> according to any one of above-mentioned <1> ~ <13>, wherein, the hydrophilic agent making hydrophily different is attached to the fiber being positioned at above-mentioned first surface side and the fiber being positioned at above-mentioned second side.

The nonwoven fabric of <15> according to any one of above-mentioned <1> ~ <14>, wherein, make non-ionic surface active agent be attached to the fiber of above-mentioned first surface side, and make anion surfactant be attached to the fiber of above-mentioned second side.

The nonwoven fabric of <16> according to any one of above-mentioned <1> ~ <15>, wherein, thermally extensible fiber is configured at above-mentioned first surface side partially on ground.

, wherein, there is the region not containing thermally extensible fiber in above-mentioned second side in the nonwoven fabric of <17> according to above-mentioned <16>.

The nonwoven fabric of <18> according to above-mentioned <16> or <17>, wherein, the content of above-mentioned thermally extensible fiber reduces gradually from first surface side direction second side.

The nonwoven fabric of <19> according to above-mentioned <1> ~ <18>, wherein, above-mentioned nonwoven fabric is at above-mentioned first surface side configuration supporter and the nonwoven fabric sending hot blast from above-mentioned second side-blown and produce.

<20> absorbent commodity, the first surface side of the nonwoven fabric according to any one of above-mentioned <1> ~ <19> uses as skin surface side by it.

The newborn child's diaper of <21> mono-kind, the first surface side of the nonwoven fabric according to any one of above-mentioned <1> ~ <19> uses as skin surface side by it.

The manufacture method of a <22> nonwoven fabric, it is the manufacture method of the nonwoven fabric described in above-mentioned <1> ~ <18>, wherein, utilizing carding machine to be configured in by net is alternately arranged on the supporter in a large amount of projections and hole along different directions, by blowing the first hot blast as the side of second and carrying out figuration from above-mentioned nonwoven fabric, then make fiber thermally bonding by blowing the second hot blast.

Embodiment

Below, based on embodiment, the utility model is illustrated in greater detail, but and be not interpreted as the restriction of the utility model by these embodiments.

[embodiment 1]

(1) making of surficial sheets

As net 51 and net 52, use core for polyethylene terephthalate and sheath comprises the sheath-core type conjugate fiber of poly 2.4dtex × 51mm, be made into nonwoven fabric test body c1.For the core sheath composite fibre for net 51,52, adjustment hydrophilic agent and make its contact angle reach value in table.By these nets 51 and net 52 respectively according to making weight per unit area reach 15g/m ²mode utilize carding machine to be supplied to size enlargement apparatus.In addition, in size enlargement apparatus, there is a large amount of projection and the supporter 110 with aeration stacking gradually above-mentioned net 51 and net 52, make net duplexer 50 and make it fix.The MD spacing of the projection 111 of this supporter 110 under overlooking is set to 8mm, CD spacing is set to 5mm, the height of projection 111 is set to 7.5mm.In addition, the aperture in the hole 112 of supporter 110 is set to 2.8mm.

Then, the first hot blast W1 (temperature 130 DEG C, wind speed 50m/s) is blowed to the net duplexer 50 on supporter 110, along the projection 111 on supporter 110, figuration has been carried out to net duplexer 50.Then, switch to the second hot blast W2 of temperature 145 DEG C, wind speed 1.1m/s, make the fiber of each core sheath structure thermally bonding, figuration shape is fixed.Above-mentioned process velocity is set as 50m/min.Make nonwoven fabric test body c1 thus.

The weight per unit area of the nonwoven fabric test body c1 of embodiment 1 is 30.1g/m ², sheet thickness is 3.9mm.In addition, the contact angle of the fiber of first surface side is 76.7 degree, and the contact angle of the fiber of second side is 68.5 degree.The fibre density of first protuberance of nonwoven fabric test body c1 is 92/mm ², nonwoven fabric test body c1 the fibre density of the second protuberance be 446/mm ².In addition, above-mentioned contact angle and fibre density utilize above-mentioned assay method to measure.

(2) making of diaper

Surficial sheets is removed with diaper (trade name " Marys Dry Air Through M size " system in 2012) from the commercially available newborn child of Kao Corp, replace this surficial sheets and stacked nonwoven fabric test body c1, by fixing around it and obtain the newborn child's diaper evaluated.

[embodiment 2]

In example 2, the resin composition being used in the core sheath composite fibre of net 51,52 is identical with embodiment 1, and adjusting hydrophilic agent becomes value in table to make contact angle.In addition, under the condition same with above-described embodiment 1, nonwoven fabric test body c2 has been made.The weight per unit area of the nonwoven fabric test body c2 of embodiment 2 is 29.7g/m ², sheet thickness is 4.0mm.In addition, the contact angle of the fiber of first surface side is 78.0 degree, and the contact angle of the fiber of second side is 70.7 degree.The fibre density of first protuberance of nonwoven fabric test body c2 is 93/mm ², the fibre density of second protuberance of nonwoven fabric test body c2 is 441/mm ².

Replace the nonwoven fabric test body c1 of embodiment and use nonwoven fabric test body c2, thus having made diaper.

[embodiment 3]

In embodiment 3, as net 51, employ and core is polyethylene terephthalate and sheath comprises the sheath-core type conjugate fiber 50% of poly 2.4dtex × 51mm and core is polypropylene (PP) and the fibrous material that mixes of the thermally extensible sheath-core type conjugate fiber 50% that sheath comprises polyethylene (PE).On the other hand, as net 52, employ the core identical with the sheath-core type conjugate fiber for net 51 and be polyethylene terephthalate and sheath comprises the fibrous material of the sheath-core type conjugate fiber 100% of poly 2.4dtex × 51mm.For the core sheath composite fibre for net 51,52, adjustment hydrophilic agent and make its contact angle reach value in table.In addition, under the condition same with above-described embodiment 1, nonwoven fabric test body c3 has been made.The weight per unit area of the nonwoven fabric test body c3 of embodiment 3 is 29.9g/m ², sheet thickness is 3.5rmm.In addition, the contact angle of the fiber of first surface side is 76.5 degree, and the contact angle of the fiber of second side is 67.9 degree.The fibre density of first protuberance of nonwoven fabric test body c3 is 59/mm ², the fibre density of second protuberance of nonwoven fabric test body c3 is 426/mm ².

Replace the nonwoven fabric test body c1 of embodiment and use nonwoven fabric test body c3, thus having made diaper.

[embodiment 4]

In example 4, as net 51, employ and core is polyethylene terephthalate and sheath comprises the sheath-core type conjugate fiber 70% of poly 2.4dtex × 51mm and core is polypropylene (PP) and the fibrous material that mixes of the sheath-core type conjugate fiber 30% that sheath comprises the thermally extensible of polyethylene (PE).For the core sheath composite fibre for net 51,52, adjustment hydrophilic agent and make its contact angle reach value in table.In addition, under condition similarly to Example 3, nonwoven fabric test body c4 has been made.The weight per unit area of the nonwoven fabric test body c4 of embodiment 4 is 30g/m ², sheet thickness is 3.7mm.In addition, the contact angle of the fiber of first surface side is 74.6 degree, and the contact angle of the fiber of second side is 67.4 degree.The fibre density of first protuberance of nonwoven fabric test body c4 is 66/mm ², the fibre density of second protuberance of nonwoven fabric test body c4 is 433/mm ².

Replace the nonwoven fabric test body c1 of embodiment and employ nonwoven fabric test body c4, thus having made diaper.

[comparative example 1]

In comparative example 1, utilize the manufacture method recorded in the embodiment 1 of Japanese Unexamined Patent Publication No. 200825081 publications (patent document 1), made with the test body of the nonwoven fabric that is feature of the concaveconvex shape with striated.The weight per unit area of the nonwoven fabric test body d1 of comparative example 1 is 27g/m ², sheet thickness is 1.3mm.In addition, the contact angle of the fiber of first surface side is 84.5 degree, and the contact angle of the fiber of second side is 79.4 degree.The fibre density of the convex shaped part of nonwoven fabric test body d1 is 65/mm ², define opening at recess.

Replace the nonwoven fabric test body c1 of embodiment and use nonwoven fabric test body d1, thus having made diaper.

[comparative example 2]

In comparative example 2, make no concave-convex and at the different nonwoven fabric test body d2 of bilateralis water-based.Specifically, make the mesh sheet material that the fiber identical with embodiment 1 is formed, with 139 DEG C, the hot blast of wind speed 1.5m/sec carried out heat treatment.

The weight per unit area of the nonwoven fabric test body d2 of comparative example 2 is 29.6g/m ², sheet thickness is 2.3mm.In addition, the contact angle of the fiber of first surface side is 76.5 degree, and the contact angle of the fiber of second side is 68.4 degree.The fibre density of nonwoven fabric test body d2 is 244/mm ².

Replace the nonwoven fabric test body c1 of embodiment and use nonwoven fabric test body d2, thus having made diaper.

[comparative example 3]

In comparative example 3, the method utilizing the embodiment 1 of Japanese Unexamined Patent Publication 03-137258 publication to record, has made nonwoven fabric test body.The weight per unit area of the nonwoven fabric test body d3 of comparative example 3 is 27g/m ², sheet thickness is 5.5mm.In addition, the contact angle of the fiber of first surface side is 76.9 degree, and the contact angle of the fiber of second side is 76.3 degree.The fibre density of the convex shaped part of nonwoven fabric test body d3 is 80/mm ², define opening at recess.

Replace the nonwoven fabric test body c1 of embodiment and use nonwoven fabric test body d3, thus having made diaper.

Then, evaluation method is described.Nonwoven fabric test body or diaper is used to carry out following determination test.

The mensuration > of < weight per unit area

The weight per unit area of each nonwoven fabric test body measures in accordance with the following methods.First, nonwoven fabric test body is cut into the size of 250mm × 200mm, it can be used as mensuration sheet.This mensuration sheet is placed in electronics Libra (manufacturer is not limit).Weight under this state is measured, this weight divided by area, using the value of gained as weight per unit area (g/m ²).As measured value, each 3 are measured and adopt its mean value.

The mensuration > of < sheet thickness

Use KES compression test (KATOTEC (strain) KES FB-3 processed), for each nonwoven fabric test body, with normal mode to until 5.0 × 10 ³the compression property of Pa is evaluated, when reading small pressurization from record figure (0.05 × 10 ³pa) thickness.As measured value, each 3 are measured and adopt its mean value.

The mensuration > of < soft stool adhesion amount and just enlarged-area

By newborn child by diaper (test body) horizontal positioned, injecting 10g to central portion (position of urinating) with the speed of 2g/ second simulating soft stool (with bentonite: glycerine: water: the ratio mixing of EMULGEN130K (trade name, Kao Corp's control surface activating agent)=28: 14: 114: 14 without adding pressure, be adjusted to viscosity 300mPas), leave standstill 5 minutes.Afterwards, transparent PET sheet material is placed on the surface of surficial sheets lightly, then from the top of transparent PET sheet material to reach 3.5 × 10 ³the mode of Pa places counterweight, pressurizes 5 minutes.Afterwards, removing counterweight, takes out transparent PET sheet material, measures, calculate the weight of the simulation soft stool being attached to transparent PET sheet material thus, as soft stool skin adhesion amount to the weight of the transparent PET sheet material before and after pressurization.In addition, the area of the simulation soft stool diffusion after pressurization is measured, as soft stool diffusion area.

The mensuration > of < print through (strike through)

Liquid print through represents that the surface of the normal saline solution of ormal weight from sheet material is rearwardly by the required time (second).Use the testing machine LISTER (trade name) of LENZING Inc., based on by EDANA (European Disposables And Nonwovens Association; Europe nonwoven fabric industry meeting) test method " 153.0-02REPEATED LIQUID STRIKE-THROUGH TIME " of defined measures.Specifically, overlapping placement 10 special filter papers on the pedestal of testing machine, and place nonwoven fabric test body thereon.Then, the offset plate with electrode is placed in above-mentioned nonwoven fabric test body, adds 5ml from the liquid input port be connected with this plate.Then, the power supply of call through test machine.Testing machine to measure from the state of liquid and electrode contact to liquid by nonwoven fabric its water level decreasing to not with time of electrolytic contacts.This mensuration is carried out N=3 time, and its mean value is recorded as print through measured value.

The measurement result of above-mentioned each assessment item and evaluation result are shown in table 1.

[table 1]

Evaluation result is as shown in Table 1 known: compared with the test body d1 ~ d3 of comparative example, and the soft stool adhesion amount of the nonwoven fabric test body c1 ~ c3 of embodiment 1 ~ 4 and just diffusion area are inhibited, and the Negotiation speed of liquid is excellent.

Can think: although utilize this embodiment and embodiment to be illustrated the utility model, but as long as no special instructions, just not the utility model is limited in some illustrated details, wide in range explanation should be made under the prerequisite of the purport and scope of not violating the utility model shown in appending claims.

The application advocates based on the priority of on June 22nd, 2012 at the Japanese Patent Application 2012-141395 of Japanese publication, will fit into the part that this description is recorded in this as reference in it.

Symbol description

10 nonwoven fabric

11 first protuberances

11T first protuberance top

11K inner space

11H opening portion

11W wall portion

12 second protuberances

12T second protuberance top

12K inner space

12H opening portion

12W wall portion

16 first rib portions

17 second rib portions

Z1 first surface side

Z2 second side

Claims

1. a nonwoven fabric, it has to give prominence in the first surface side of the side overlooking sheet-like nonwoven cloth and to have the first protuberance of inner space, with give prominence in second side with described first surface side opposite side and there is the second protuberance of inner space, there is the wall portion of circulus between the opening portion of the inner space of the top of described first protuberance and described first protuberance, described first protuberance, second protuberance alternately configures continuously on the opticochiasmatic different directions of bowing of this nonwoven fabric, the hydrophily being positioned at the fiber of described first surface side is lower than the hydrophily of the fiber being positioned at described second side, the any position of fiber in the whole circumference of ring-type spreading all over wall portion forming the wall portion of described first protuberance all has fiber-wall-element model on the direction linked by the edge part at described first protuberance top and described opening portion.

2. nonwoven fabric according to claim 1, inner in the thickness of sheet material, the hydrophily of described first surface side is lower than the hydrophily of described second side.

3. nonwoven fabric according to claim 1 and 2, it has the gradient that hydrophily uprises from described first surface side towards described second side.

4. nonwoven fabric according to claim 1 and 2, wherein, the aqueous phase of described first surface side is more than 7 degree and less than 10 degree for the contact angle of fiber and the aqueous phase of described second side for the difference of the contact angle of fiber.

5. nonwoven fabric according to claim 1 and 2, wherein, the aqueous phase of described first surface side is more than 8 degree and less than 9 degree for the contact angle of fiber and the aqueous phase of described second side for the difference of the contact angle of fiber.

6. nonwoven fabric according to claim 1 and 2, wherein, aqueous phase is more than 74 degree and less than 80 degree for the contact angle of the fiber being positioned at described first surface near surface.

7. nonwoven fabric according to claim 1 and 2, wherein, aqueous phase is more than 64 degree and less than 73 degree for the contact angle of the fiber being positioned at described second near surface.

8. nonwoven fabric according to claim 1 and 2, wherein, the fibre density (r1) of described first protuberance is lower than the fibre density (r2) of described second protuberance.

9. nonwoven fabric according to claim 1 and 2, wherein, the fibre density of described first protuberance is 30/mm ²above and 130/mm ²below.

10. nonwoven fabric according to claim 1 and 2, wherein, the fibre density of described second protuberance is 250/mm ²above and 500/mm ²below.

11. nonwoven fabric according to claim 1 and 2, wherein, the difference of the fibre density of described first protuberance and the fibre density of described second protuberance is 150/mm ²above.

12. nonwoven fabric according to claim 1 and 2, wherein, any position of fiber in the whole circumference of ring-type spreading all over wall portion forming the wall portion of described second protuberance all has fiber-wall-element model on the direction linked by the edge part at described second protuberance top and described opening portion.

13. nonwoven fabric according to claim 1 and 2, wherein, the hydrophilic agent making hydrophily different is attached to the fiber being positioned at described first surface side and the fiber being positioned at described second side.

14. nonwoven fabric according to claim 1 and 2, wherein, make non-ionic surface active agent be attached to the fiber of described first surface side, and make anion surfactant be attached to the fiber of described second side.

15. nonwoven fabric according to claim 1 and 2, wherein, thermally extensible fiber is configured at described first surface side partially on ground.

, wherein, there is the region not containing thermally extensible fiber in described second side in 16. nonwoven fabric according to claim 15.

17. nonwoven fabric according to claim 15, wherein, the content of described thermally extensible fiber reduces gradually from first surface side direction second side.

18. nonwoven fabric according to claim 1 and 2, wherein, described nonwoven fabric is at described first surface side configuration supporter and the nonwoven fabric sending hot blast from described second side-blown and produce.

19. 1 kinds of absorbent commodities, the first surface side of the nonwoven fabric described in top arbitrary in claim 1 ~ 18 uses as skin surface side by it.

20. 1 kinds of newborn child's diapers, the first surface side of the nonwoven fabric according to any one of claim 1 ~ 18 uses as skin surface side by it.