CN100434055C - Surface sheet of absorbing product - Google Patents
Surface sheet of absorbing product Download PDFInfo
- Publication number
- CN100434055C CN100434055C CNB2004100284832A CN200410028483A CN100434055C CN 100434055 C CN100434055 C CN 100434055C CN B2004100284832 A CNB2004100284832 A CN B2004100284832A CN 200410028483 A CN200410028483 A CN 200410028483A CN 100434055 C CN100434055 C CN 100434055C
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- Prior art keywords
- surficial sheets
- woven fabrics
- catheter
- fiber
- membranization
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Images
Abstract
The surface sheet of the absorbent article of this invention comprises a nonwoven fabric which includes a fabric in a three-dimensionally curled condition and a heat fusible fabric, and is disposed with many apertures 2. The aperture 2 is a three-dimensional aperture equipped with a liquid guiding tube 8 which extends from the upper surface to the bottom surface of the nonwoven fabric and is surrounded by the nonwoven fabric. A film region which is formed by melting solidification of the above heat fusible fabric exists at least at the inner surface of the liquid guiding tube 8 and the inside in the direction of the thickness of the liquid guiding tube 8 at the film region is not formed into film and is liquid permeable.
Description
Technical field
The present invention relates to the surficial sheets and the manufacture method thereof of absorbing products such as a kind of sanitary napkin or disposable diaper.
Background technology
The surficial sheets of the absorbing products of existing multiple perforate with three-dimensional shape.For example, the previously presented surficial sheets of the applicant (opening flat 5-228173 communique referring to the spy) forms the film like structures that does not almost have breathability in the wall portion and the bottom of three-dimensional perforate.In case this surficial sheets has the premium properties of the liquid generation adverse current that prevents to be absorbed bulk absorption, also has good liquid disguise simultaneously.And can prevent in absorbing products wears, press the three-dimensional shape that makes perforate to destroy by wearer's body.But owing to become membrane structure, excretory sometimes liquid moves quickly on the absorber and is obstructed, and liquid holdup is on surficial sheets.
The surficial sheets (opening flat 4-152945 communique referring to the spy) that a kind of absorbing products is arranged in addition, by the wherein a part of catheter that forms of sheet material that the thermoplastic synthetic fiber constitutes, the lower aperture end at this catheter is formed by reinforcement simultaneously.This reinforcement makes a part of fusion of fiber, makes its membranization and forms.Thereby in this surficial sheets, exist and described spy opens the same shortcoming of surficial sheets described in the flat 5-228173 communique.
On the other hand, the applicant proposes a kind of surficial sheets (opening flat 8-246321 communique referring to the spy), and to the bottom, the thickness that constitutes the non-woven fabrics of this perforate reduces gradually from top with three-dimensional perforate.On this surficial sheets, three-dimensional perforate presents the gradient of capillary force, and this gradient forms driving force, and excretory liquid is imported absorber apace, does not produce the residual of liquid on surficial sheets.This surficial sheets does not exist the spy to open shortcoming on flat 5-228173 communique and the flat 4-152945 communique of Te Kai, but on the contrary in the wearing of absorbing products, the three-dimensional shape of wearer's body pressure-volume destructible perforate.
Summary of the invention
The invention provides a kind of surficial sheets of absorbing products, it is by the fiber and the heat fusing binder fibre that contain three-dimensional rolled state (three-dimensionally crimped fiber), and the non-woven fabrics that forms many perforates constitutes.This perforate has from being surrounded and the three-dimensional perforate of the catheter that forms by this non-woven fabrics that this non-woven fabrics face of facing down extends out.The membranization zone (filmyportion) that exists the melting and solidification by described heat fusing binder fibre to form on the inner surface at least of this catheter, the while is in the thickness direction not membranization of inside of this catheter in this membranization zone, and has liquid permeability.
The present invention also provides a kind of manufacture method of absorbing products surficial sheets, as making described surficial sheets preferable methods, it comprises: the pecker (perforating pin) that uses the above temperature of fusing point that is heated to the heat fusing binder fibre, to comprise the fleece or the non-woven fabrics perforation of potential crimping property fiber and described heat fusing binder fibre, formation has the three-dimensional perforate of catheter, and in its formation, make the described heat fusing binder fibre melting and solidification that exists on the inner surface at least of described catheter, form the membranization zone at described inner surface, then under described potential crimping property fiber presents temperature more than the curling temperature, described fleece or described non-woven fabrics are heat-treated, make described potential crimping property fiber present curling.
The present invention provides another manufacture method of a kind of absorbing products surficial sheets again, another preferable production process as described surficial sheets, under the potential crimping property fiber presents temperature more than the curling temperature, the fleece or the non-woven fabrics that comprise this potential crimping property fiber and heat fusing binder fibre are heat-treated, make this potential crimping property fiber present curling, use the pecker of the temperature more than the fusing point that is heated to described heat fusing binder fibre then, with described fleece or the perforation of described non-woven fabrics, formation has the three-dimensional perforate of catheter, and in its formation, make the described heat fusing binder fibre melting and solidification that exists on the inner surface at least of described catheter, form the membranization zone at described inner surface.
Description of drawings
Fig. 1 is the oblique view that shows the surficial sheets of absorbing products of the present invention.
Fig. 2 is the sketch of major part that amplifies the vertical section of the surficial sheets shown in the displayed map 1.
Fig. 3 is the key diagram that shows the liquid flow on the surficial sheets shown in Figure 1.
Fig. 4 is the sketch (figure suitable with Fig. 2) of major part of vertical section that enlarge to show another embodiment of surficial sheets of the present invention.
Fig. 5 shows the oblique view with sanitary napkin of surficial sheets of the present invention.
Fig. 6 is the key diagram that shows the whiteness method of measuring surficial sheets.
The specific embodiment
The present invention relates to a kind of surficial sheets of absorbing products, the three-dimensional shape of perforate is stably kept, have good drained liquid permeability even the surficial sheets of this absorbing products applies under the state that body presses the wearer.
Following basis is preferred embodiment referring to description of drawings the present invention.Fig. 1 is the oblique view that shows the surficial sheets (the following surficial sheets that also claims) of absorbing products of the present invention.Fig. 2 is the sketch of major part that amplifies the vertical section of the surficial sheets shown in the displayed map 1.
As depicted in figs. 1 and 2, the surficial sheets 1 of present embodiment has many perforates 2,2 of arranging regularly ..., by comprising that the non-woven fabrics of upper strata 3 with 2 layers of structure of the lower floor 4 that is adjacent constitutes.Upper strata 3 and lower floor 4 form one.Upper strata 3 is positioned at the surperficial 1A side of surficial sheets 1, and lower floor 4 is positioned at bottom surface 1B side.When the surperficial 1A side of surficial sheets 1 is meant that surficial sheets 1 is on being assembled in absorbing products, with wearer's side in opposite directions.In addition, 1B side in bottom surface is meant the absorber side in opposite directions with absorbing products.
The non-woven fabrics that constitutes surficial sheets 1 is not particularly limited, and can use existing known non-woven fabrics.Can suitably select according to the concrete application target and the purposes of surficial sheets, for example utilize the heat fusing bonded mat of combing method manufacturing to utilize hot blast to handle the various non-woven fabrics such as the hot sticky non-woven fabrics of sucking type (suction heat bond), spun bond nonwoven fabric, meltblown non-woven fabrics, jet net-spraying method non-woven fabrics and needle point method non-woven fabrics that obtain.The combination of fiber is not particularly limited in these non-woven fabrics, for example can use binding agent bonding or heat fusing is bonding.Replace the bonding of fiber in addition, also can utilize such use fibre machinery formula complexations such as jet net-spraying method non-woven fabrics.In order to realize desirable characteristic, particularly bright and clean sense of touch significantly, and flexibility, as non-woven fabrics, the most suitable selection uses the heat fusing bonded mat that is obtained by combing method to utilize hot blast to handle, and does not carry out strong compression and the hot sticky non-woven fabrics of the sucking type of nonwovenization.
Perforate 2 forms three-dimensional perforate, and this solid perforate has the non-woven fabrics encirclement that is extended out by the surperficial 1A side direction bottom surface 1B side from surficial sheets 1 and the catheter 8 that forms.And the inner surface 2A of catheter 8 is made of the continuous face that comes from surperficial 1A.Form in the perforate 2 of stereo structure, as shown in Figure 2, its peripheral 2B is positioned at the lower end of perforate 2.The shape of the inverted cone that the taper that the shape of catheter 8 for example has the diameter of cylindric or catheter 8 to increase successively from surperficial 1A side direction bottom surface 1B, but preferably as depicted in figs. 1 and 2, the diameter of catheter 8 are reduced successively by surperficial 1A side direction bottom surface 1B side.The shape of the transverse section of perforate 2 is not particularly limited, and for example can be oval, triangle or dimetric perforate, and from the viewpoint of the soft feeling that improves surficial sheets 1, it is such preferably to make Fig. 1, does not have anisotropic round hole.
From the concealed viewpoint of the stable maintenance, liquid permeability and the liquid that improve catheter 8, the opening diameter of perforate 2 on the 2B of its lower end is 0.5～3mm, preferred especially 7～1.5mm.Consider that from improving liquid permeability aspect the percent opening of preferred surface sheet material 1 is 3～30%, more preferably 5～25%, preferred again 10～20%.Percent opening is the area of the perforate 2 that forms during to bottom surface 1B side from its surperficial 1A lateral projection divided by surficial sheets 1 with the area of surficial sheets 1 and the value of trying to achieve.Specifically, opening diameter and percent opening specifically utilize following method to measure.
[assay method of opening diameter and percent opening]
Use light source [Sunlight SL-230K2; LPL (strain) society system], shelf [Copy StandCS-5; LPL (strain) society system], lens [Nikkol 24mm/F2.8D, Nikon Corp.], CCD photographing unit [(hv-37; With society of Hitachi's electronics (strain) system) be connected with lens by the F support] and display panel [Spectra 3200; Canopus Co., Ltd.], obtain the image of the bottom surface 1B side of surficial sheets 1.The image analysis software (ver.3.08) of imagery exploitation NEXUS society system of picked-up is split bore portion to carry out double quantification and handles.The image of being handled by double quantification is tried to achieve the respective diameters of circle of equal value, with it as opening diameter.With the part area that the area of entire image is handled divided by double quantification, try to achieve percent opening (%).Measure opening diameter at need, the full coat aperture portion is graded on figure, carries out aid in treatment.
Form to surperficial 1A side convex curvature between the adjacent perforate 2 and have top 5.The bottom surface 1B of top 5 correspondences on the surficial sheets 1 towards surperficial 1A convex curvature equally.Just, 2 adjacent of perforates form arc shape.And many tops 5 roughly linearly connect, and form rib portion.Rib portion 6,6 ... form with multiple row.Form ditch portion 7 between the adjacent rib portion 6,6, rib portion 6 and ditch portion 7 alternate configurations are not so that form planar portions.Rib portion (ridge) 6 is convex curvature to surperficial 1A side, and ditch portion 7 is convex curvature to bottom surface 1B side.Certain interval is set in the ditch portion 7, forms many perforates 2,2 ...By forming such rib portion 6 and ditch portion 7, make the direction parallel with rib portion 6 and ditch portion 7, with and right angle orientation on flexural property (for example plentiful pliability (bulk softness) etc.) have anisotropy, improve the adaptability or the quality of surficial sheets 1 and health.Rib portion 6 and ditch portion 7 alternate configurations, ditch portion 7 is become by the continuous-surface shape from rib portion 6.The distance that adjacent ribs portion is 6,6 (i.e. 5,5 distance) is preferably 1～6mm, is in particular 1.5～4mm.The distance that adjacent ditch portion is 7 is preferably 1～6mm, more preferably 1.5～4mm equally.The direction of rib portion 6 and ditch portion 7 can be when making as the raw material non-woven fabrics of surficial sheets 1 longitudinal direction (operating direction) consistent, also can be inconsistent.
Upper strata 3 is made of the heat fusing binder fibre.Core-sheath-type composite fibre that the suitable use of heat fusing binder fibre thermoplastic resin constitutes or parallel composite fiber etc.In addition, lower floor 4 constitutes by presenting curling potential crimping property fiber.The potential crimping property fiber is a kind of fiber with following character, can handle equally with the fiber that existing non-woven fabrics is used before the heating, and by heat under the fixed temperature, present that spiral helicine solid is curled and contraction.The fusing point height of the heat fusing binder fibre that the fusing point of potential crimping property fiber contains than upper strata 3.Thus, make lower floor's 4 not membranizations as described later, make the membranization easily of surface at least on upper strata 3.Just, be as what the potential crimping property fiber used, no matter presenting curl before and after, be not melt bonded under the temperature below the fusing point of the heat fusing binder fibre that contains on upper strata 3.When heat fusing binder fibre and/or potential crimping property fiber were made of the resin more than 2 kinds, the fusing point of this fiber was the corresponding fusing point of the minimum resin of fusing point.In order to improve the intensity of this lower floor, also can contain the heat fusing binder fibre in the lower floor 4.
As shown in Figure 2, in surficial sheets 1, the inner surface membranization of catheter 8.In more detail, the surface on the upper strata 3 of the inner surface of formation catheter 8 is by the melting and solidification of the heat fusing binder fibre on this upper strata of formation, and membranization continuously forms membranization zone 9.Membranization zone 9 is by the peripheral 2B of the catheter 8 whole zone to institute's take the altitude.Therefore top 5 and the not membranization in advance of its neighboring area on the surficial sheets 1 can be led to liquid.And catheter 8 is on membranization zone 9, the thickness direction not membranization of inside of catheter 8, and have liquid permeability.Specifically, with nearby zone and lower floor's 4 not membranizations of interface of lower floor 4 on the upper strata 3, and has liquid permeability.There is not heat fusing bonding between the latent crimp fiber that contains in the lower floor 4.So-called membranization promptly constitutes fibers melt, and plurality of fibers is melt bonded, and the gap between the fiber covers, and the surface of melt bonded portion becomes level and smooth state.The membranization zone can be not form on the whole zone of the inner surface of catheter 8 yet.Viewpoint with the liquid permeability, and the dimensionally stableization that makes catheter, the viewpoint of the obturation of the aperture portion that external force such as relevant pressure is brought in preventing to wear, preferably at more than 10% of thickness direction of catheter 8, particularly more than 30%, and more than 70% of the peripheral direction of catheter 8, particularly more than 80%, form the membranization zone.
By there being the part of filminess, make catheter 8 have rigidity in the catheter 8 in the surficial sheets 1 of present embodiment.The result is applied to catheter 8 even wearer's body is pressed in the wearing of the absorbing products with this surficial sheets, also can prevent its destruction, can its three-dimensional shape of stable maintenance.In addition, the thickness direction of catheter 8 is inner owing to there is not membranization, and the liquid of the inside by catheter 8 produces apace and moves, and can prevent to be detained liquid in the surficial sheets 1.Particularly in the zone that does not have membranization, owing to mainly constituting, so can form the space that many liquid see through by the curling potential crimping property fiber that presents of solid.Thus, the liquid of the inside by catheter 8 moves more apace.Therefore surficial sheets 1 often keeps dry and comfortable state, is difficult for producing the discomfort such as being clamminess property to skin.
The liquid permeation mechanism of the surficial sheets 1 of present embodiment is described in further detail, as shown in Figure 3.As shown in Figure 3,1.～3. the fluid flow path in the surficial sheets 1 has three.1. path directly sees through for the liquid by perforate 2.2. path utilizes this path for the liquid of the inside by surficial sheets 1 sees through, and is received this surficial sheets from the surperficial 1A side draught of surficial sheets 1 by excretory liquid, by the thickness direction inside of catheter 8, imports to absorber (do not have among the figure and show).As previously mentioned, the thickness direction of catheter 8 is inner mainly to be constituted by presenting the three-dimensional potential crimping property fiber that curls, so form many spaces that see through liquid, makes can successfully see through by the excretory liquid in this space.3. path sees through for the liquid along the surperficial 1A of surficial sheets 1.Utilize this path, the Surface runoff of the catheter 8 of excretory liquid runs down membranization.The partially liq of membranization is difficult to be detained, so liquid imports to absorber fast.Like this, utilize the surficial sheets 1 of present embodiment, no matter by any paths, excretory liquid is difficult to produce liquid residue in surficial sheets 1 by the absorber that leads apace.
Upper strata 3 on the surficial sheets 1 of present embodiment and each basic weight of lower floor 4 are that the state before contraction and perforate is performed as follows respectively preferably.Promptly aspects such as the disguise of the easness that forms from raising membranization zone, surficial sheets 1, quality, adsorptivity consider that the basic weight on preferred upper strata 3 is 5～40g/m
2, be in particular 10～20g/m
2, the basic weight of lower floor 4 is 5～50g/m
2, be in particular 10～35g/m
2Shrink and perforate after the basic weight of layer 3,4 of state be the income value that basic weight under the state before contraction and perforate multiply by percentage reduction of area described later.Contraction and formed surficial sheets 1 basic weight of perforate own are to consider preferred 15～180g/m from the quality of surficial sheets 1 and the processability aspect of non-woven fabrics
2, preferred especially 20～100g/m
2
The surficial sheets 1 preferred method manufacturing of present embodiment according to the following stated.At first use carding machine to make the fleece of each tool upper strata 3 and lower floor's 4 structures respectively.The fleece that constitutes upper strata 3 is made of the heat fusing binder fibre, and the fleece that constitutes lower floor 4 is made of the potential crimping property fiber that curls before presenting.With the direct lamination of the fleece that obtains, or carry out lamination after utilizing predetermined non-woven fabrics manufacture method to make non-woven fabrics, carry out embossing again and handle, make corresponding two-layer joint.When embossing is handled, do not present curlingly in the potential crimping property fiber that contains in the lower floor 4 in order to make, it is curling to limit that two-layer laminate is installed on the restraint device such as pin chain stenter.Lower floor 4 is close to separately in its face equally shrinks, so when being installed in described laminate on the restraint device, preferably whole periphery is installed on the restraint device.Under the potential crimping property fiber that lower floor 4 is contained presents temperature more than the curling temperature, two-layer laminate is heat-treated then, make this potential crimping property fiber shape is three-dimensional in the shape of a spiral and curl, make its contraction.The contraction result is mainly to form many spaces that can see through liquid in lower floor 4.The path that this space sees through as drained liquid.Heat-treating methods can use the blowing hot-air of ventilative mode (air through) or infrared ray radiation etc.When shrinking, adjust heat treated temperature so that not produce heat fusing between the potential crimping property fiber bonding.The degree of shrinking is represented with percentage reduction of area, is preferably 30～80%, is preferably 30～60% especially.
The degree of shrinking can be adjusted, and all peripheries of described laminate are taked the previous restraint devices such as installation pin chain stenter that use, the size after making it meet contraction.Percentage reduction of area is represented in order to following formula, and perisystolic benchmark area is set at S
0, area is set at S after the contraction of benchmark area
1
Percentage reduction of area (%)=(S
0-S
1)/S
0* 100
On described laminate, form three-dimensional perforate then.Specifically, be to make described laminate between the 1st extruding module and the 2nd extruding module, push.The 1st extruding module is made of pin roll (pin roll), and this pin roll is along the carrying direction of described laminate, the side of making awl or conical many peckers (convex pin) formation row shape, and also these row are multiple row and are arranged side by side.The 2nd extruding module is made of grovved roll (fluted roll), and this grovved roll has the projecting strip part (ridge) that embeds between the prominent shape pin of multiple row on the 1st the 1st extruding module.At this moment, push described laminate, make upper strata 3 relative, and lower floor 4 is relative with the 2nd extruding module with the 1st extruding module.The result easily forms described top 5 by the projecting strip part of grovved roll, and pushes to described laminate by the convex pin on the pin roll, makes described laminate perforation, forms the perforate 2 with catheter 8.The thickness of the non-woven fabrics after the perforate is bigger before than perforate.
During perforation, with the convex pin heat in advance under the fixed temperature.Heating-up temperature is set in more than the fusing point of the heat fusing binder fibre that contains on upper strata 3, and not to the temperature of the fusing point of the potential crimping property fiber that is in rolled state.Thus, when formation has the perforate 2 of catheter 8, make the heat fusing binder fibre melting and solidification that exists on this catheter inner surface, form membranization zone 9 at this inner surface.Keep intact and not membranization in the thickness direction inside of catheter 8.At this moment, as previously mentioned, preferably described laminate is installed on the restraint device such as pin chain stenter, restriction potential crimping property fiber further curls.
The other embodiment of surficial sheets of the present invention as shown in Figure 4.The surficial sheets 1 of present embodiment has the structure of the surficial sheets of similar embodiment shown in Figure 2.Both are by difference, and the bottom surface 1B side of the surficial sheets 1 of present embodiment on sheet material 1 is littler than the surficial sheets of embodiment shown in Figure 2 towards the degree of surperficial 1A side convex curvature.Just, in the surficial sheets 1 of present embodiment, the area that bottom surface 1B side contacts with absorber is bigger than the surficial sheets of embodiment shown in Figure 2.The result is in the surficial sheets 1 of present embodiment, and liquid is good to the mobility of absorber.The manufacture method of this surficial sheets 1 is as follows.At first use carding machine to make respectively to constitute the fleece of upper strata 3 and lower floor 4, the fleece that obtains directly or utilize fixed non-woven fabrics manufacture method carry out lamination after making non-woven fabrics, carry out embossing in view of the above and handle so that two-layer joint obtains laminate.At this moment preferably this laminate is installed on the restraint devices such as pin chain stenter.Carry out described perforation procedure for this laminate, form perforate with catheter.In when perforation, the convex pin is heated in advance on the fusing point of the heat fusing binder fibre that contains on upper strata 3, and the temperature of the fusing point of this potential crimping property fiber when being lower than rolled state.Can only make the heat fusing binder fibre melting and solidification of the inner surface existence of catheter thus, form the membranization zone at this inner surface.Melt bonded between this potential crimping property fiber that can prevent to contain in the lower floor 4, can keep intact and not membranization in catheter thickness direction inside.At this moment, preferably laminate is installed on the restraint devices such as pin chain stenter, it is curling that the potential crimping property fiber is not presented.
Then, to described laminate, the potential crimping property fiber that contains in lower floor 4 presents under the temperature more than the curling temperature heat-treats, and makes this potential crimping property fiber helically carry out solid and curls, and makes its contraction.The result who shrinks is the main space that the many liquid of formation can see through in lower floor 4.The path that this space sees through as excretory liquid as previously mentioned.When shrinking, preferably as previously mentioned laminate is installed on the restraint devices such as pin chain stenter, the scope of percentage reduction of area of setting this laminate is in aforementioned range.
Be example below with the sanitary napkin, have the absorbing products of the surficial sheets 1 of described each embodiment referring to description of drawings.Fig. 5 has the absorbing products of surficial sheets 1 of described present embodiment as the oblique view of sanitary napkin.Sanitary napkin 10 shown in Fig. 5 has the surficial sheets 1 of present embodiment, the bottom surface of liquid impermeability (do not have among the figure and show) and absorber (do not have among the figure and show).Surficial sheets 1 has perforate (the whole zone at surficial sheets 1 among Fig. 5 forms perforate 2) in the zone corresponding to wearer's excretory portion at least.The length direction of the rib portion 6 in the surficial sheets 1 and the direction of ditch portion 7 and sanitary towel 10 is consistent.The surficial sheets 1 that makes sanitary towel 10 have present embodiment makes such sanitary towel 10 liquid residue on surficial sheets 1 few thus, has comfortable dry feeling, good wearing feeling.Because three-dimensional perforate is difficult for festering, in a single day liquid be absorbed bulk absorption, is difficult to present backflow, and shows good dry feeling, good wearing feeling thus.
The fiber that is three-dimensional rolled state among the present invention also can use crimped fibre, and curling by mechanicalness makes it have three-dimensional crimp, and this crimped fibre replaces the spiral helicine potential crimping property fiber that presents rolled state.At this moment sheet manufacturing method is as follows.To contain the crimped fibre that carries out machine crimp in advance and the fleece of remollescent heat fusing binder fibre under the temperature of the softening point that is lower than this crimped fibre, it is above and be lower than the pecker of the temperature of crimped fibre softening point that use is heated to the softening point of this heat fusing binder fibre, to this fleece perforation.When formation has the three-dimensional perforate of catheter, follow the formation in hole to make the described heat fusing binder fibre melting and solidification that exists on the inner surface at least of this catheter, on this inner surface, form the membranization zone.The material or the structure of the crimped fibre of machine crimp are not particularly limited, as long as the softening point higher position of the melt bonded fiber of its softening point specific heat is passable.
The invention is not restricted to aforesaid embodiment.For example in said embodiment, the membranization continuously of the inner surface of catheter 8 is handled the membranization discontinuously of the inner surface of catheter 8 but also fiber not melt bonded under the fusing point of hot-melt-bondable fiber can be sneaked in right amount upper strata etc.The inner surface of catheter 8 not only, outer surface also can membranization.When the outer surface membranization that makes catheter 8, the non-woven fabrics that constitutes surficial sheets is made three-decker, contain the heat fusing binder fibre the upper strata, contain the intermediate layer of the fiber that is three-dimensional rolled state and contain the lower floor of heat fusing binder fibre.This fiber that is three-dimensional rolled state is so long as not melt bonded getting final product below the fusing point of this heat fusing binder fibre.
In aforementioned embodiments, surficial sheets has 2 layers of structure, also it can be made single layer structure in addition.It can also be made the multiple structure more than 3 layers as the aforementioned.
The vertical section shape of surficial sheets 1 is not limited to the shape shown in Fig. 2 etc., also can be that the spy opens the shape shown in flat 4-152945 communique the 3rd or the 7th figure.
Below by embodiment the present invention is described in further detail.But scope of the present invention is not subjected to the restriction of embodiment.
(1) manufacturing on upper strata
The heat fusing binder fibre uses the core-sheath-type composite fibre (trade name NBF-SH, core: polyethylene terephthalate, sheath: polyethylene, core/sheath weight ratio=5/5, fiber number 2.2dtex, the long 51mm of fiber) of Daiwa Textile Co., Ltd..Poly fusing point as sheath is 130 ℃.Use carding machine that this fiber is separated fibre, make fleece, utilize ventilative mode to heat-treat (120 ℃) then, obtaining basic weight is 12g/m
2The air permeability method non-woven fabrics.
(2) manufacturing of lower floor
Use the potential crimping property fiber (with polypropylene as the core composition, ethylene-propylene random copolymer as core-sheath-type composite fibre, fiber number 2.2dtex, Daiwa Textile Co., Ltd.'s system of the heat-shrinkable of sheath composition, 90 ℃ of temperature begin to curl) make the combing method fleece in the same manner as raw material and upper strata.The ethylene-propylene random copolymer fusing point of sheath is 139 ℃.Heat embossing roller arrangement (the roll temperature: 145 ℃ in embossing face), this fleece is carried out embossing processing that uses concavo-convex roller and flat roll to be combined to form.Each embossed spots of concavo-convex roller is circular, and its embossing area is 0.0055cm
2The distance (pitch) that goes up in the embossed spots in the heart along longitudinal direction (machine direction) is 7mm, is 1.4mm along in the heart distance (pitch) in the embossed spots of transverse direction.The embossing area occupation ratio is 28%.The basic weight of the heat embossing non-woven fabrics that obtains is 20g/m
2
(3) manufacturing of laminate
With two non-woven fabrics laminations, make it pass through the heat embossing roller arrangement of forming by concavo-convex roller and flat roll, thereby it is become one two non-woven fabrics joint, obtain laminate.The temperature of concavo-convex roller is set in 155 ℃.The embossed pattern of concavo-convex roller is a kind of pattern of so-called plover shape, and each embossed spots is circular, and its embossing area is 0.047cm
2In the heart distance (pitch) is 7mm, is 7mm along in the heart distance (pitch) in the embossed spots of transverse direction in the embossed spots of longitudinal direction.In the heart distance is 5mm in the embossed spots of oblique 45 ℃ direction.The embossing area occupation ratio is 7.2%.
(4) the potential crimping property fiber curls
In the heated drying machine that is heated to after 130 ℃,, make the potential crimping property filament contraction of lower floor with laminate heat treatment 1～3 minute.At this moment, the fixed shrinkage factor in order to obtain is set the size after shrinking, and four limits of laminate are fixed on the pin chain stenter, and restriction is above shrinks.Shrinkage factor is as shown in table 1.The basic weight of the laminate after the contraction is 60g/m
2
(5) formation of perforate
On the laminate after the contraction, form three-dimensional perforate.Between the 1st extruding module and the 2nd extruding module, perforate is made in extruding with laminate.The 1st extruding module is made of pin roll, and front end forms many peckers of cone shape along the carrying direction, forms the row shape, and these row are multiple row and are arranged side by side.The 2nd extruding module is made of the grovved roll of projecting strip part between the multiple row pecker on the 1st extruding module with embedding the 1st.The diameter of pecker is 1.5mm, and pin roll is heated to 130 ℃.Obtain having the non-woven fabrics of three-dimensional perforate illustrated in figures 1 and 2 like this.Percent opening and thickness are as shown in table 1 respectively.
With the curling and form the reversed order of perforate of potential crimping property fiber, except that the basic weight of levels and shrinkage factor are as shown in table 1 and embodiment 1 obtain the non-woven fabrics with three-dimensional perforate shown in Figure 4 in the same manner.Percent opening and thickness are as shown in table 1 respectively.
Comparative example 1
Use sanitary napkin Laurier Sarasara Cushion Slim (no the flap) (market name: surficial sheets Laurier UN-f-11) of Kao Corp's system.This surficial sheets is that a kind of carding machine that utilizes is made fleece with core-sheath-type composite fibre (core: polyethylene terephthalate, sheath: the weight ratio of polyethylene, core/sheath is 5/5, fiber number 2.2dtex, the long 51mm of fiber), utilizes air permeability method that this fleece is made the article that non-woven fabrics is made.And the pecker by diameter 1.5mm forms three-dimensional perforate shown in Figure 1.
Performance evaluation
The whiteness of non-woven fabrics (surficial sheets) after measuring absorption simulate blood sample under low load-carrying and the high load-carrying that embodiment and comparative example are obtained.The results are shown in following table 1.Separately basic weight of the upper and lower of non-woven fabrics, the percentage reduction of area when making non-woven fabrics, thickness, the percent opening of surficial sheets on the aperture portion are recorded in the table 1 in the lump.
The mensuration of the whiteness after absorbing the simulate blood sample under low load-carrying and the high load-carrying.
(1) preparation of simulate blood
In the 2L beaker, add ion exchange water 1500g, add 5.3g sodium carboxy methyl cellulose [Northeast chemistry (strain) system, CMC-Na] (this solution is called A) while stirring with magnetic stirrer.In the 1L beaker, add ion exchange water 556g then, add 27.0g sodium chloride [Northeast chemistry (strain) system] and 12g sodium bicarbonate [NaHCO while stirring with magnetic stirrer
3, Northeast chemistry (strain) system] and make it dissolve (this solution is called B) fully.In the 3L beaker, measure 900g glycerol again, add described (A) and (B) stir.Aqueous solution 15ml and No. 2 [seller: ア イ ゼ Application (strain) of edible haematochrome of adding concentration (surfactant/water)=1g/L of nonionic surfactant [Emulgen 935] [make and sell flower king's (strain)] again; Protect native Silicon Valley chemical industry (strain), manufacturing side: ダ イ ワ changes into (strain)] 29.6g, stir.Utilize glass filter that the solution that obtains is carried out suction filtration, with this filtrate as simulate blood.When the preparation simulate blood, replace above-mentioned surfactant in addition, also can use other nonionic surfactant, obtain same result.But the use amount that needs the adjustment form surface-active agent, the contact angle scope that makes the relative glass surface of simulate blood that finally obtains is 35～40 °.Use contact angle determination device (consonance Surface Science (strain), FACE contact angle meter CA-A type), on the glass surface of ethanol wash clean, measure described contact angle.
(2) mensuration of whiteness
Below the non-woven fabrics that obtains by embodiment and comparative example (surficial sheets), absorber and interior facesheet are set, obtain the sanitary napkin of mode shown in Figure 5 according to usual way.Bottom surface sheet material and absorber use the system Laurier Sarasara Cushion Slim (no flap) of Kao Corp respectively, and (market name: (thickness 4.5mm, basic weight are 200g/m for bottom surface sheet material (polyethylene film system) that uses Laurier UN-f-11) and absorber
2Fluff pulp) in cooperate water absorbent polymer (acrylic acid sodium acrylate salt copolymer) 40g/m
2, reuse 16g/m
2Absorption paper parcel form).The sanitary towel that obtains is made its surficial sheets horizontal positioned that makes progress, place the polyacrylate plate of band cylinder shown in Figure 6 on it.At this moment, on the polyacrylate plate, place weight, in sanitary towel, apply load-carrying 5g/cm
2And 50g/cm
2The height that the polyacrylate plate is of a size of length 200mm * wide 100mm * thickness 8mm, cylinder is that 50mm, internal diameter are 10mm.The hole that on the polyacrylate plate, also has same diameter.The load-carrying of polyacrylate plate is placed, make the hole that is provided with on it be positioned at the center of sanitary towel.Under this state, the beaker with simulate blood 6g puts into 10 milliliters stably injects in the cylinder.Injection rate is 3g, makes it finish injection in about 5 second time.After inject finishing, placed 300 seconds, removal weight and polyacrylate plate afterwards utilize the simple type beam split colour difference meter NF333 (trade name) of Japanese electric color industry (strain) system, the whiteness of the surficial sheets in the mensuration sanitary towel.The light projector pipe is 30 φ, uses the sample bench of 30mm φ.Carry out after the standard calibration sanitary towel being loaded on the sample bench, make its surficial sheets towards the light projector side.The face that mensuration face in sanitary towel is opposite is then placed the incidental sample pressing plate of colour difference meter (black plate).The different local simulate blood of injecting in 1 sanitary towel is measured and is injected the position 5 times.With this meansigma methods as whiteness.
Table 1
By the result shown in the table 1 as can be known, in the sanitary towel of the surficial sheets that each embodiment is housed, no matter under low load-carrying and under the high load-carrying, the whiteness of surficial sheets is all high, can stop the simulate blood that is absorbed bulk absorption to flow backwards.Do not show although have in the table, in the surficial sheets of embodiment, on the inner surface of perforate, exist the membranization zone that forms by the melting and solidification of heat fusing binder fibre.Do not exist heat fusing bonding between the potential crimping property fiber of the thickness direction inside (underclad portion) of this perforate on the membranization zone, do not have membranization.
As mentioned above, the surficial sheets of absorbing products of the present invention forms the membranization zone on the inner surface at least of catheter, can improve the rigidity of this catheter, apply at user under the state of body pressure, the three-dimensional shape of perforate also can stably be kept, in case can prevent that thus the liquid that is absorbed bulk absorption from flowing backwards.The surficial sheets of absorbing products of the present invention is because the thickness direction not membranization of inside of catheter, and has liquid permeability, so the permeability of excretory liquid is good, liquid residue is few.Thereby the absorbing products that this surficial sheets is housed has good dry feeling, good wearing feeling.
Claims (7)
1, the surficial sheets of absorbing products, it is made of the non-woven fabrics that contains the fiber that is three-dimensional rolled state and heat fusing binder fibre and formed many perforates, this perforate has from being surrounded and the three-dimensional perforate of the catheter that forms by this non-woven fabrics that the described non-woven fabrics face of facing down extends out, at least the membranization zone that exists the melting and solidification by described heat fusing binder fibre to form on the inner surface of this catheter, the not membranization of thickness direction inside of the described catheter in this membranization zone has liquid permeability simultaneously.
2, the surficial sheets of absorbing products according to claim 1, wherein, described non-woven fabrics is made of the multiple structure that has the upper strata that comprises described heat fusing binder fibre and comprise the lower floor of the described fiber that is three-dimensional rolled state, at least have described membranization zone on the surface on described upper strata, described lower floor has liquid permeability.
3, the surficial sheets of absorbing products according to claim 1 and 2, wherein, the described fiber that is three-dimensional rolled state constitutes by presenting curling potential crimping property fiber.
4, the surficial sheets of absorbing products according to claim 3, wherein, the described temperature of fiber below the fusing point of described heat fusing binder fibre that is three-dimensional rolled state is not melt bonded.
5, the manufacture method of the described absorbing products surficial sheets of claim 1, it comprises: under the potential crimping property fiber presents temperature more than the curling temperature, the non-woven fabrics that comprises this potential crimping property fiber and heat fusing binder fibre is heat-treated, make this potential crimping property fiber present curling, use the fusing point be heated to described heat fusing binder fibre above and be lower than the pecker of temperature of the fusing point of the described potential crimping property fiber that is rolled state then, with described non-woven fabrics perforation, formation has the three-dimensional perforate of catheter, and in its formation, make the described heat fusing binder fibre melting and solidification that exists on the inner surface at least of described catheter, form the membranization zone at described inner surface.
6, the manufacture method of the described absorbing products surficial sheets of claim 1, it comprises: the pecker that uses the above temperature of fusing point that is heated to the heat fusing binder fibre, to comprise the non-woven fabrics perforation of potential crimping property fiber and described heat fusing binder fibre, formation has the three-dimensional perforate of catheter, and in its formation, make the described heat fusing binder fibre melting and solidification that exists on the inner surface at least of described catheter, form the membranization zone at described inner surface, then under described potential crimping property fiber presents temperature more than the curling temperature, described non-woven fabrics is heat-treated, make described potential crimping property fiber present curling.
7, the manufacture method of the surficial sheets of absorbing products according to claim 6 wherein, when carrying out described perforation, is installed in curling with restriction potential crimping property fiber on the restraint device with described non-woven fabrics.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP200368664 | 2003-03-13 | ||
| JP2003-68664 | 2003-03-13 | ||
| JP2003068664A JP3886466B2 (en) | 2003-03-13 | 2003-03-13 | Absorbent article surface sheet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1530085A CN1530085A (en) | 2004-09-22 |
| CN100434055C true CN100434055C (en) | 2008-11-19 |
Family
ID=33285931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100284832A Expired - Fee Related CN100434055C (en) | 2003-03-13 | 2004-03-12 | Surface sheet of absorbing product |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3886466B2 (en) |
| CN (1) | CN100434055C (en) |
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| US10206826B2 (en) | 2014-03-06 | 2019-02-19 | The Procter & Gamble Company | Three-dimensional substrates |
| US10285874B2 (en) | 2014-03-06 | 2019-05-14 | The Procter & Gamble Company | Multi-component topsheets |
| TWI715573B (en) * | 2015-05-29 | 2021-01-11 | 日商優你 嬌美股份有限公司 | Manufacturing method of shaped non-woven fabric for absorbent articles |
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| JP4540590B2 (en) * | 2005-11-09 | 2010-09-08 | 花王株式会社 | Solid sheet for absorbent articles |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP3886466B2 (en) | 2007-02-28 |
| JP2004275296A (en) | 2004-10-07 |
| CN1530085A (en) | 2004-09-22 |
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