CN1831228B - Nonwoven - Google Patents
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- CN1831228B CN1831228B CN2006100588911A CN200610058891A CN1831228B CN 1831228 B CN1831228 B CN 1831228B CN 2006100588911 A CN2006100588911 A CN 2006100588911A CN 200610058891 A CN200610058891 A CN 200610058891A CN 1831228 B CN1831228 B CN 1831228B
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Abstract
The non-woven fabric includes stereo crimped fiber, and the stereo crimped fiber has crimped direction inclined to the axis at the angle of 55 deg or below. The stereo crimped fiber has preferably flat cross section. The non-woven fabric possesses preferably one first layer including the first surface and one second layer including the second surface, the first surface is uneven and the second layer contains stereo crimped fiber.
Description
Technical field
The present invention relates to comprise the nonwoven fabric of stereo crimped fiber.In addition, the present invention relates to the absorbent commodity of this nonwoven fabric as face sheet.
Background technology
When judging the nonwoven fabric feel,, investigate the relation between being out of shape such as the elongation of itself and nonwoven fabric, wrinkling, bending by apply various power to nonwoven fabric normally with pinching, gently drag, touch or method such as bending.The feel of nonwoven fabric is judged from above-mentioned diversified angle comprehensively.
The surface smoothing of one of key element of relevant judgement nonwoven fabric feel, to improve this characteristic is purpose, and the fluffing that has proposed a kind of surface has obtained the face sheet (with reference to Japanese Patent Application Laid-Open 2003-235896 communique and Te Kai 2003-265528 communique) of the absorbent commodity of inhibition.Open in the 2003-235896 communique the spy, by containing superficial layer and carrying out the stacked face sheet that obtains with 2 layers of above-mentioned superficial layer stacked the 2nd layer or more multi-layered layer, wherein said superficial layer is to obtain by forming web of staple fibers and will depressing with the hot-rolling that is heated to 120～130 ℃ from the top of this outstanding staple fibre of its surface, and described the 2nd layer is to be obtained by the fiber web that has mixed natural fabric.On the other hand, open in the 2003-265528 communique the spy, by nonwoven fabric is clipped between two rollers or roller is rolled across on nonwoven surface and with the fluffing fiber overwhelm in nonwoven surface.The fluffing that suppresses nonwoven surface is important factor for improving feel.But, only having suppressed fluffing, comprehensive feel does not also claim well, at other essential factor that the raising of feel is produced considerable influence, i.e. soft feeling and loftiness aspect and insufficient.
Summary of the invention
The invention provides a kind of nonwoven fabric, it comprises stereo crimped fiber, and the coiling direction of this stereo crimped fiber becomes the following angle θ of 55 degree to tilt with respect to axis direction.
In addition, the invention provides a kind of absorbent commodity, as face sheet, described nonwoven fabric comprises stereo crimped fiber with nonwoven fabric for it, and the coiling direction of this stereo crimped fiber becomes the following angle θ of 55 degree to tilt with respect to axis direction.
Moreover, the invention provides a kind of manufacture method of nonwoven fabric, it comprises: form the fiber web that comprises the potential crimping property fiber, make between this fibroreticulate formation fiber melt bonded, when this is melt bonded or make above-mentioned potential crimping property fiber show three-dimensional curling afterwards, implement calendering processing then and make and show the three-dimensional fibre deformation that curls, and the coiling direction of fiber is tilted with respect to axis direction.
Description of drawings
Fig. 1 is the sectional schematic diagram of an embodiment of nonwoven fabric of the present invention.
Fig. 2 is the illustration intention of the stereo crimped fiber that comprises in the nonwoven fabric of the present invention.
Fig. 3 is the electron micrograph of the stereo crimped fiber that comprises in the nonwoven fabric that obtains of embodiment 1.
Fig. 4 is the electron micrograph of the stereo crimped fiber that comprises in the nonwoven fabric that obtains of comparative example 1.
Fig. 5 is the schematic diagram of common stereo crimped fiber.
The specific embodiment
It is following that the present invention will be described with reference to accompanying drawing according to its embodiment preferred.Fig. 1 is the sectional schematic diagram of the preferred embodiment of nonwoven fabric of the present invention.Nonwoven fabric 1 is the nonwoven fabric that has the 1st layer 11 of comprising one surface and comprise 2 layers of structure of the 2nd layer 12 on another surface.Constitute by fiber assembly (fiber aggregate) respectively for the 1st layer 11 and the 2nd layers 12, stacked mutually and engage partly.The 1st layer 11 and the 2nd layers 12 junction surface 13 is such as shown, by the effect of heat and/or pressure by densificationization, thereby thickness is littler than other position of nonwoven fabric 1.Like this, exist in a large number according to the protuberance 15 of predetermined pattern decentralized configuration and be formed on recess 14 on the junction surface 13 in a large number the 1st layer of 11 1 side, by these protuberances 15 and recess 14, then the 1st of nonwoven fabric 1 the layer surface has just formed concaveconvex shape.
The 1st layer 11 and the 2nd layers 12 formation fiber engages in its crosspoint, or the state that becomes not engage.When being engaged in the crosspoint between the fiber, as its juncture, it is bonding and adopt the bonding etc. of bonding agent to list the heat fusing that for example adopts the hot blast method.As described later, when comprising crimped fibre in the 2nd layer 12, from improving the free degree between the fiber, the viewpoint of the compression and back renaturation of raising thickness direction and the retractility of in-plane is set out, preferred this crimped fibre does not engage, but by twining by sheet mutually.
Comprise stereo crimped fiber in the 2nd layer 12.Give nonwoven fabric 1 retractility owing to comprising stereo crimped fiber.As shown in Figure 5, stereo crimped fiber has fiber is wound into coil (coil) shape (helical form) along axis A shape.As shown in same figure, the stereo crimped fiber normally coiling direction of its fiber becomes angle θ near level with respect to the direction of axis A.With it the contrast, the stereo crimped fiber that comprises in the nonwoven fabric 1 of the present embodiment as shown in Figure 2, the coiling direction of fiber is with respect to the obliquely-angled θ of direction of the axis A of fiber.Like this, when comparing with the stereo crimped fiber of same diameter, the stereo crimped fiber of the present embodiment then shown in Figure 2 is compared with common stereo crimped fiber shown in Figure 5, and second moment of area (moment) descends.Consequently, nonwoven fabric 1 integral body descends to the rigidity of bending, and nonwoven fabric 1 just becomes softness and the product of the good softness of (drape) property of dangling like this.And then the loftiness of bringing with the concaveconvex structure that is had by nonwoven fabric 1 supplements and complements each other, and makes the flexibility of nonwoven fabric 1 become more remarkable.Therefore, even nonwoven fabric 1 is designed to high mass area ratio, also can keep flexibility or pliability.In addition, the stereo crimped fiber of the present embodiment shown in Figure 2 is compared with common stereo crimped fiber shown in Figure 5, and when observing its integral body, it is level and smooth that the surface of fiber becomes.Consequently, the 2nd layer 12 the surface that comprises stereo crimped fiber becomes level and smooth.
From making nonwoven fabric 1 become the viewpoint of product of the good softness of softness more and drapability and the viewpoint that makes its surface become more level and smooth, the fiber coiling direction of the stereo crimped fiber of the present embodiment with respect to the direction of axis A become 55 degree following, be preferably the following angle of 45 degree (following this angle is also referred to as winding angle) θ.The lower limit of winding angle θ is not particularly limited, but preferred 5 the degree or more than.Winding angle θ is by surveying with the electron microscope observation stereo crimped fiber.At this moment, stereo crimped fiber is reeled the scope in 1 week along axis A in, when because the difference that locates and angle of inclination not simultaneously, are defined as winding angle θ with this angle of inclination of angle of inclination minimum position.In addition, the winding angle θ of the stereo crimped fiber that comprises in the 2nd layer 12 does not have θ to there is no need all in above-mentioned scope, so long as with many stereo crimped fibers be the mean value of the winding angle θ that measures of object in above-mentioned scope, just can give nonwoven fabric 1 desired characteristic.It is suitable that the radical that is used to measure the stereo crimped fiber of winding angle θ is made as 5～10.
As mentioned above, the nonwoven fabric 1 of the present embodiment is owing to contain the stereo crimped fiber of state shown in Figure 2, thereby except having the retractility that the original character of stereo crimped fiber brings, also can become the product of the good softness of softness and drapability, and the 2nd layer 12 surface becomes level and smooth.From the flatness that makes the 2nd layer 12 significant more viewpoint that becomes, stereo crimped fiber as described in Figure 2, preferably its cross section S's is shaped as flat pattern.Different with the stereo crimped fiber of the present embodiment shown in Figure 2, common stereo crimped fiber as shown in Figure 5, the shape of its cross section S is circular.
When the cross section of stereo crimped fiber S is flat pattern, preferably its flat ratio value (long axis length/minor axis length) be 1.2 or more than, be preferably 1.3 or above flat pattern especially.Stereo crimped fiber is preferably that the cross section is flat pattern on its total length, but be not limited to this, so long as 70% in the total length or above, particularly 80% or the cross section of above part be flat pattern, the surface smoothing of nonwoven fabric 1 highly significant that can become then.Special when the crosspoint between the stereo crimped fiber engages, the cross section at preferred junction surface is flat pattern.
In addition, stereo crimped fiber is a flat pattern all preferably, but is not limited thereto.When the 2nd layer 12 vertical section is amplified the transverse shape of observing stereo crimped fiber with electron microscope, be benchmark with the radical, if 70% or above fiber be flat shape, the surface smoothing of nonwoven fabric 1 highly significant that can become then.In addition, can not be that the total length of stereo crimped fiber all is flat shape yet.It is suitable that the radical that is used to observe the stereo crimped fiber of flat form is made as 10.
In order further to give the 2nd layer 12 of nonwoven fabric 1 with flatness, the stereo crimped fiber that the above-mentioned cross section S that comprises in the 2nd layer 12 is a flat pattern, preferably the long axis direction in its cross section roughly is orientated on the in-plane of nonwoven fabric 1.From this viewpoint, especially be positioned at the 2nd layer 12 surface and near stereo crimped fiber thereof, preferably the long axis direction of its cross section S is orientated on the in-plane of nonwoven fabric 1.What is called roughly is orientated, be meant when the 2nd layer 12 vertical section amplified the long axis direction of observing flat stereo crimped fiber with electron microscope, with the radical is benchmark, then 70% or the long axis direction of above fiber become with the in-plane of nonwoven fabric 1 ± 30 degree or with interior angle.
In addition, from the significant more viewpoint of the flatness on the two sides that makes nonwoven fabric 1, the stereo crimped fiber that the 1st layer 11 formation fiber also comprises in the 2nd layer 12, preferred its cross section be shaped as flat pattern, and then more preferably the long axis direction of its cross section S is orientated on the in-plane of nonwoven fabric 1.
In the present embodiment, also comprise stereo crimped fiber in the 1st layer 11 of preferred nonwoven fabric 1.Like this, high-freedom degree because curl (1) between the non-melt bonded fiber that mutual winding produced in (crimp) retractility that shape produced and (2) can play the additional effect that the compression and back renaturation improves, resiliency (cushion) becomes good of the 1st layer 11 protuberance.The stereo crimped fiber that comprises in the stereo crimped fiber that comprises in the 1st layer 11 and the 2nd layer 12 can be an identical type, also can be different types of.At this moment, the 1st layer of 11 viewpoint that forms concaveconvex structure, the ratio of the stereo crimped fiber that comprises in preferred the 2nd layer 12 is higher than the ratio of the stereo crimped fiber that comprises in the 1st layer 11 from successfully.
When comprising stereo crimped fiber in the 1st layer 11, its ratio be preferably the stereo crimped fiber that comprises in the 2nd layer 12 ratio 10～90%, be preferably 30～50% especially.The value of the ratio of the stereo crimped fiber that comprises in each layer, the 1st layer 11 is preferably 10～70 weight %, is preferably 10～50 weight % especially.Be preferably 50～100 weight % for the 2nd layer 12, be preferably 70～100 weight % especially.
When comprising stereo crimped fiber in the 1st layer 11, this stereo crimped fiber is also the same with the stereo crimped fiber that comprises in the 2nd layer 12, and the coiling direction of optimum fiber tilts with respect to axis direction.Like this, can further give nonwoven fabric 1 retractility, and further give its flexibility or pliability.In addition, the 1st layer 11 surface can become level and smooth.From the above point of view, the stereo crimped fiber that comprises in the 1st layer 11 preferably has shape and the structure that describes with regard to the stereo crimped fiber that comprises in the 2nd layer 12.That is,, can be suitable for the explanation that the stereo crimped fiber that comprises in the 2nd layer 12 is carried out aptly for the stereo crimped fiber that comprises in the 1st layer 11.
In nonwoven fabric 1, preferred the 1st layer 11 density (fibre density) is lower than the 2nd layer 12. promptly, preferred the 1st layer 11 has formed than the 2nd layer of 12 more loose structure. like this, the protuberance 15 that forms the 1st layer of 11 1 side becomes bulk, the resiliency of nonwoven fabric 1 integral body becomes good, feel improves. in addition as described later, when the face sheet that nonwoven fabric 1 is used as absorbent commodity, and when being configured in skin contact one side with the 1st layer 11, because the liquid that is discharged on the face sheet promptly is absorbed in the 1st layer 11, and be absorbed into that liquid in the 1st layer 11 utilizes density gradient-structure (gradient of sparse-dense structure) and successfully move toward the 2nd layer 12, therefore can prevent effectively owing to liquid residue cause on the surface of face sheet airtight, itch and scytitis, unplessantness displeasure etc.
From the above point of view, the ratio (d2/d1) of the density d 2 of the 1st layer 11 density d 1 and the 2nd layer 12 is preferably 1.2～10, is preferably 3～10 especially.The density of relevant each layer, the 1st layer 11 density is preferably 0.001～0.05g/cm
3, be preferably 0.01～0.03g/cm especially
3On the other hand, the 2nd layer 12 density is preferably 0.03～0.2g/cm
3, be preferably 0.04～0.1g/cm especially
3The assay method of density is as follows.
At first, cut out the test film that length and width are 30mm * 30mm from nonwoven fabric 1.Relevant the 1st layer 11 density d 1 with length direction (constituting the fiber orientation directions (flow direction when nonwoven fabric is made) of the 1st layer the nonwoven fabric) almost parallel of test film and by on the line at junction surface 13, is vertically done section along thickness direction.Measure the 1st layer 11 apparent thickness t1 (mm) from this section.The assay method of apparent thickness t1 as described later.Then, from the 1st layer 11 area before the 1st layer 11 and the 2nd layers 12 engage, measuring in advance (a1 * b1) and make the 1st layer 11 to engage with the 2nd layer 12 after the 1st layer 11 the area (a2 * b2), obtain the shrinkage area rate A (%) of test film according to following formula of mensuration.
Shrinkage area rate A=((÷ of a1 * b1-a2 * b2) (a1 * b1)) * 100
Moreover, from shrinkage area rate A (%) that tries to achieve and the 1st layer 11 the mass area ratio P1 (g/m that before the 1st layer 11 and the 2nd layers 12 engage, measures in advance
2), obtain the 1st layer 11 and the 2nd layers 12 the 1st layer mass area ratio P2 (g/m behind the joint according to following formula
2).
The 1st layer mass area ratio P2=P1 * 100/ (100-A)
Then, obtain the 1st layer 11 fibre density d1 (g/cm according to following formula
3)
d1＝P2×(1/1000)×(1/t1)
Relevant the 2nd layer 12 density can adopt with the 1st layer 11 the same method of density inspect method and obtain.At this moment, the 2nd layer 12 apparent thickness t2 measures with method described later, calculates density d 2 with the value of measuring.
The assay method of apparent thickness t1 and t2 is as follows.At first, cut out the test film that length and width are 30mm * 30mm from nonwoven fabric.Then with length direction (constituting the fiber orientation directions flow direction of the nonwoven fabric when making () of the 1st layer nonwoven fabric) almost parallel and line by junction surface 13 on do section.The Highscope SZH10 of use OLYMPUS corporate system obtains the enlarged photograph of this section.Contrasting the ratio (scale) of enlarged photograph, obtaining the 1st layer 11 maximum ga(u)ge, it is being decided to be the 1st layer apparent thickness (t1).In addition, the thickness the 2nd layer of its maximum ga(u)ge determination part position-finding of the 1st layer is decided to be the 2nd layer apparent thickness (t2) with it.That is, the apparent thickness of layers 1 and 2 is to measure along the same straight line that extends on the thickness direction of nonwoven fabric.
Although the mass area ratio of nonwoven fabric 1 will be looked concrete purposes and be determined, be preferably 40～110g/m
2, be preferably 50～90g/m especially
2About constituting each layer of nonwoven fabric 1, the 1st layer 11 mass area ratio is preferably 20～55g/m
2, be preferably 25～45g/m especially
2The 2nd layer 12 mass area ratio is preferably 20～55g/m
2, be preferably 25～45g/m especially
2
Formation fiber with regard to each layer describes, and as previously described, comprises stereo crimped fiber in the 2nd layer 12.Can only constitute, also can comprise other fiber for the 2nd layer 12 by stereo crimped fiber.As other fiber, can list natural fabrics such as regenerated fibers such as for example common thermoplastic fibre and artificial silk, cotton.Except stereo crimped fiber, when also comprising other fiber, the combined amount of other fiber is preferably 1～50 weight % with respect to the 2nd layer of 12 integral body, is preferably 5～30 weight % especially in the 2nd layer 12.
On the other hand, formation fiber as the 1st layer 11, can list natural fabrics such as regenerated fibers such as for example common thermoplastic fibre and artificial silk, cotton. in addition, as previously described, also can comprise stereo crimped fiber in the 1st layer 11. the combined amount of the stereo crimped fiber of this moment is as mentioned above.
When comprising the fiber beyond the stereo crimped fiber in the 1st layer 11 and the 2nd layers 12, from the flatness on the two sides that the makes nonwoven fabric 1 significant more viewpoint that becomes, fiber beyond the stereo crimped fiber is also same with stereo crimped fiber, preferred its cross section be shaped as flat pattern, and then the long axis direction that is more preferably its cross section S is orientated on the in-plane of nonwoven fabric 1.
Below, describe with regard to the preferable production process of the nonwoven fabric 1 of the present embodiment.Make at first, respectively and constitute the 1st layer 11 and the 2nd layers 12 fiber assembly.As this fiber assembly, can use for example fiber web and nonwoven fabric.Nonwoven fabric adopts for example manufacturings such as hot blast method, hot-rolling method (heat embossing method), air lay method, meltblown.Fiber web adopts for example carding machine manufacturing.Especially preferably use nonwoven fabric as the fiber assembly that constitutes the 1st layer 11, use fiber web as the fiber assembly that constitutes the 2nd layer 12.
Preferably in constituting the 2nd layer 12 fiber web, comprise latent crimp fiber.So-called latent crimp fiber is meant being heated before and can similarly handles with fiber with common nonwoven fabric, and it is curling to show the solid of coiled type by the heating under the predetermined temperature, thereby has the fiber of retractable property.Latent crimp fiber is by being that the eccentric core-sheath-type composite fibre (eccentric core-sheath conjugate fiber) of composition or parallel composite fiber (eccentric side-by-side conjugate fiber) constitute with 2 kinds of different thermoplastic, polymeric materials of shrinkage factor for example.As the example, can list the latent crimp fiber of putting down in writing among JP-A-9-296325 and the JP-B-2759331.
On the other hand, the stereo crimped fiber that preferably in constituting the 1st layer 11 nonwoven fabric, comprises latent crimp fiber or coiled type.In addition, preferably constitute the heat-shrinkable fiber that does not comprise in the 1st layer 11 the nonwoven fabric beyond the latent crimp fiber.
Then, constituting the fiber assembly that overlaps on the 2nd layer 12 the fiber assembly the 1st layer 11, they are engaged partly according to predetermined pattern.The method that both are engaged, as long as can form the junction surface 13 that at least the 1 layer 11 thickness has reduced than other position, then the whole bag of tricks can use.Preference such as heat embossing method or ultrasonic wave embossed method.Junction surface 13 can be separate diffusing point-like, also can be linearity or curve-like (comprising continuous wave etc.), clathrate, zigzag fashion etc.The shape at each junction surface when junction surface 13 being configured to loose point-like can be arranged to shape arbitrarily such as circle, triangle, quadrangle.
The 1st layer 11 and the 2nd layers 12 to joint apply heat, make the latent crimp fiber solid that comprises in the 2nd layer 12 be curled into coiled type.The stereo crimped fiber of this state becomes state shown in Figure 5.That is, the coiling direction of fiber roughly becomes horizontal direction with respect to the direction of axis A.By curling the 2nd layer 12 formation filament contraction between junction surface 13.Be accompanied by this contraction, the 1st layer 11 formation fiber protuberance between junction surface 13.Formed protuberance 15 by this protuberance.In addition, between protuberance 15, promptly 13 position has formed recess at the junction surface.Like this, the surface that has obtained the 1st a layer of side has formed the nonwoven fabric of concaveconvex shape.The detailed methods of fabrication of this nonwoven fabric is documented among the applicant for example previous application CN1348026A, TW550317B, the CN1509864A.
Then the nonwoven fabric that obtains is implemented calendering processing.Use pair of rolls to carry out in the calendering processing.Among the above-mentioned roller, a roller is metal calender.Another roller be D hardness (JISK6253) be preferably 40～100 the degree, more preferably 70～95 the degree resin system roller or metal system rollers.Another roller height of the D hardness ratio of calender, or identical with another roller.By using the combination of above-mentioned roller, thereby the coiling direction that makes the stereo crimped fiber that comprises in the nonwoven fabric tilts with respect to the direction of axis.
Particularly, nonwoven fabric is fed between the pair of rolls and is subjected to calendering processing and by cramping. consequently, the stereo crimped fiber distortion, thereby its coiling direction tilts with respect to the direction of axis. and the cross section becomes flat pattern. have again, nonwoven fabric has been applied the effect of " rubbing " by cramping, the part distortion of the binding site between the fiber or destroyed, it is soft that nonwoven fabric becomes. and then, the long axis direction that is deformed in the cross section of stereo crimped fiber of flat pattern is orientated on the in-plane of nonwoven fabric. at this moment, if in the 2nd layer 12 except stereo crimped fiber, also comprise other fiber (not having the curling fiber or the fiber of two-dimensional crimp), then but the concentrated area applies clamping force to stereo crimped fiber, and the inclination of the coiling direction of fiber becomes more remarkable. and the flattening of fiber becomes more remarkable. and the situation that comprises crimped fibre in the 1st layer 11 also is same.
It is all to adopt that nonwoven fabric is implemented calendering processing all the time, but its purpose nearly all is in order to prevent the fluffing of nonwoven surface as introducing in the background technology.Therefore, the condition of calendering processing is relatively gentleer, and the situation that calendering processing proceeds to this degree of fibre deformation seldom.Particularly to comprising that nonwoven fabric that solid is curled into the fiber of coiled type is implemented calendering processing and the situation that makes this stereo crimped fiber distortion owing to can destroy the rolled state of the coiled type that specially forms, therefore is considered to disadvantageous processing.In contrast, the present inventor is unexpected to be found, by the nonwoven fabric that comprises stereo crimped fiber is implemented calendering processing, this stereo crimped fiber is out of shape as illustrated in fig. 2, then nonwoven fabric descends for the rigidity of bending, and is soft thereby nonwoven fabric becomes, and the surface becomes level and smooth.Its reason is because the second moment of area of stereo crimped fiber descends as previously described to a great extent.
Line pressure in the calendering processing is preferably 50～700N/cm, more preferably 100～300N/cm.By under this condition, implementing calendering processing, then can either keep large-duty line speed, the coiling direction of stereo crimped fiber is tilted.And can make cross-sectional deformability become flat pattern reliably.Each roller normally uses under non-heated condition.Among pair of rolls, calender can be a flat roll of having implemented mirror finish, also can be to have applied trickle concavo-convex concavo-convex rollers such as pears surface.When another roller is resin roll, can use the roller that for example constitutes by vulcanie, silicon rubber, polyurethane rubber, acrylonitrile-butadiene rubber (NBR), ethylene-propylene-diene terpolymer resins such as (EPDM).When another roller is metal roller and calender same, can be the flat roll of having implemented mirror finish, also can be to have applied trickle concavo-convex concavo-convex rollers such as pears surface.
As mentioned above, above-mentioned manufacture method comprises following operation: (1) forms the fibroreticulate operation that comprises the potential crimping property fiber; (2) make melt bonded operation between this fibroreticulate formation fiber; (3) make above-mentioned potential crimping property fiber show three-dimensional operation of curling then; (4) enforcement calendering processing makes and shows the three-dimensional fibre deformation that curls, and makes the operation of the coiling direction of fiber with respect to the direction inclination of axis.Look different situation, the potential crimping property fiber that makes that also carries out operation melt bonded between the fibroreticulate formation fiber of making of (2) and (3) sometimes simultaneously shows three-dimensional operation of curling.
The face sheet, surgery that the nonwoven fabric 1 that adopts said method to obtain can be used for various absorbent commodities such as sanitary napkin and panty liner, disposable diaper for example is with various uses such as clothing class, cleaned slices.As previously described, nonwoven fabric 1 because surface smoothing and low for the rigidity of bending, be the product of the good softness of softness and drapability, so when nonwoven fabric 1 is particularly useful as the face sheet of absorbent commodity, can obtain the good and wearing comfort excellent absorption article of sense of touch.When with nonwoven fabric 1 during,, preferably dispose according to the 1st layer of side of this nonwoven fabric and user's the contacted mode of skin from making the better viewpoint of sense of touch as face sheet.
More than the preferred embodiments of the invention are illustrated, but the present invention is not limited to above-mentioned embodiment.For example the nonwoven fabric 1 of above-mentioned embodiment is 2 layers of structure, but the generation also nonwoven fabric can be designed to single layer structure, also can be designed to 3 layers or more multi-layered sandwich construction.When nonwoven fabric is designed to single layer structure, preferably comprise 50 weight % or above, be preferably 70 weight % or above crimped fibre especially.Nonwoven fabric also can be made of 100% crimped fibre.When nonwoven fabric being designed to 3 layers or more multi-layered sandwich construction, from the viewpoint of further raising flatness, preferably outermost layer comprises crimped fibre at least.
Embodiment
Below with embodiment the present invention is described in further detail.But scope of the present invention is not subjected to the restriction of these embodiment.
Embodiment 1
The manufacturing of (1) the 1st layer fiber assembly
The potential crimping property fiber CPP (melting temperature (fusing point) of trade name, 2.2dtex * 51mm, sheath composition resin: 145 ℃) that makes with Daiwa Textile Co., Ltd. as raw material, is 15g/m by combing method manufacturer area quality
2Fiber web.Use heat embossing roller (145 ℃ ± 10 ℃) that fiber web is carried out heat embossing processing, make the 1st layer fiber assembly.The embossing area occupation ratio is 28%.
The manufacturing of (2) the 2nd layers fiber assembly
The potential crimping property fiber CPP (melting temperature (fusing point) of trade name, 2.2dtex * 51mm, sheath composition resin: 135 ℃) that makes with Daiwa Textile Co., Ltd. as raw material, is 30g/m by combing method manufacturer area quality
2The 2nd layer fiber assembly.
(3) manufacturing of nonwoven fabric
Make the fiber assembly of the 1st layer fiber assembly and the 2nd layer overlapping, two fiber assemblies are engaged partly, obtain duplexer by ultrasonic wave embossed method.Each junction surface that obtains by embossing processing be shaped as circle, its Pareto diagram is the diamond check shape.In hot-blast stove, blow 130 ℃ ± 10 ℃ 5～10 seconds of hot blast to duplexer in the hot blast mode.Make the potential crimping property fiber crimp that comprises in each fiber assembly thus, thereby each fiber assembly direction in its face is shunk.At this moment, the potential crimping property fiber that comprises in the 1st layer the fiber assembly is because the heat embossing that had before carried out is processed, and it curls and is hindered, so the percentage reduction of area height of the fiber assembly of the percentage reduction of area of the 2nd layer fiber assembly than the 1st layer.Consequently, in the 1st layer that forms by the 1st layer fiber assembly, a large amount of protuberances between the abutment, have been formed.The mass area ratio of the nonwoven fabric that obtains like this is 92g/m
2, the area occupation ratio at abutment is 7% of a nonwoven fabric area.
(4) calendering processing
Use the pair of metal mirror roller to carry out calendering processing.Line pressure is 300N/cm.
Embodiment 2
(the core-sheath-type hot-melt-bondable composite fibre that CPP fiber (trade name), 2.2dtex * 51mm) and Daiwa Textile Co., Ltd. make is made carding fiber net as raw material by combing method to the latent crimp fiber made from Daiwa Textile Co., Ltd..The weight ratio of latent crimp fiber and hot-melt-bondable composite fibre (the former: the latter) be 50: 50.The core of latent crimp fiber is made of polypropylene, and sheath is made of ethylene-propylene random copolymer.The core of hot-melt-bondable composite fibre is made of polyethylene terephthalate, and sheath is made of polyethylene.This carding fiber net is implemented ultrasonic wave embossed processing.Embossed pattern is identical with embodiment 1.Then, blow hot blast, make the fiber intersection points heat fusing bonding in the hot blast mode.Obtaining mass area ratio thus is 92g/m
2Nonwoven fabric.
The nonwoven fabric that obtains is carried out calendering processing.Calendering processing uses the pair of metal mirror roller to carry out.Line pressure is 300N/cm.
Comparative example 1 and 2
Except do not implement calendering processing in embodiment 1 and 2, employing and embodiment 1 and 2 same methods obtain nonwoven fabric.
Estimate
To the nonwoven fabric that obtains in embodiment and the comparative example winding angle and section configuration with the determination of electron microscopy stereo crimped fiber. winding angle is to measure as object with 5 fibers, calculate the value of its mean value as winding angle. in addition, measure surface characteristic (the average deviation SMD of surface roughness with following method, coefficient of friction MIU, the average deviation MMD of coefficient of friction, the linear property LC of compression property, flexural rigidity B. said determination is according to the method for putting down in writing in the following book, and the KESFB4-AUTO-A (trade name) that uses KATO TECH Corporation to make measures.
River end Ji Xiongzhu, " standardization of hand valuation and parsing ", the 2nd edition, the feel metering of civic organization Japan fibre machinery association (The Textile Machinery Society of Japan) and normalization research committee, clear and distribution on 55 years (1980) July 10.
In addition, adopt following method that the feel of nonwoven fabric has been carried out functional evaluation.The result is as shown in table 1.Moreover the electron micrograph of the stereo crimped fiber in embodiment 1 and the comparative example 1 resulting nonwoven fabric is illustrated among Fig. 3 and Fig. 4.
The assay method of the average deviation SMD of surface roughness
Prepare the test film of 20cm * 20cm, be installed on the testing stand of level and smooth metal flat.Power with 9.8cN (in error ± 0.49cN) overlays contact on test film.Constant speed with 0.1cm/sec makes test film move horizontally 2cm.Test film is applied the single-axle tension of 19.6cN/cm.Contact constitutes the U word shape that the piano wire of 0.5mm diameter bends to wide 5mm, and defeats the subsides test film with 9.8cN.Contact is by the spring roof pressure.Spring constant is set at 24.5cN/mm (in error ± 0.98cN/mm), resonant frequency break away from be set under the surperficial state of contact 30Hz or more than.The measured value of the average deviation of surface roughness SMD value representation.MD and SD also carry out this mensuration simultaneously, calculate mean value by following formula (1), with its average deviation SMD as surface roughness.
Average deviation SMD={ (the SMD of surface roughness
MD 2+ SMD
CD 2)/2}
1/2(1)
The assay method of the average deviation MMD of coefficient of friction MIU and coefficient of friction
Prepare the test film of 20cm * 20cm, be installed on the testing stand of level and smooth metal flat.Overlay on test film with the power of 49cN contact-making surface, and make test film move horizontally 2cm with the constant speed of 0.1cm/sec with contact.Test film is applied the single-axle tension of 19.6cN/cm.The piano wire of the 0.5mm diameter that contact is same with employed contact in 20 mensuration with surface roughness side by side and the U word shape that bends to wide 10mm obtain, with the power of 49cN contact-making surface is overlayed on test film by weight.Determination of Friction Coefficient value MIU value representation, the average deviation MMD value representation of this coefficient of friction MIU value.MD and CD also carry out this mensuration simultaneously, calculate mean value by following formula (2-1), (2-2), with its average deviation MMD as coefficient of friction MIU and coefficient of friction.
Coefficient of friction MIU={ (MIU
MD 2+ MIU
CD 2)/2}
1/2(2-1)
Average deviation MMD={ (the MMD of coefficient of friction
MD 2+ MMD
CD 2)/2}
1/2(2-2)
The assay method of the linear property LC of compression property
Prepare the test film of 20cm * 20cm, be installed on the testing stand.Is 2cm with this test film having area
2The steel plate of circular flat between compress.Compression speed is 20 μ m/sec, and compressing maximum loading is 4.9kPa.Recovery Process is also measured with same speed.The linear property LC value representation of compression property.The LC value is defined by following formula (3).
LC＝WC/WOC (3)
In the formula,
WOC＝Pm(T0-Tm)/2
In addition, the thickness of the sample when T0 represents that pressure is 49Pa, the thickness of the sample when Tm is illustrated in maximum pressure Pm (4.9kPa).
The assay method of flexural rigidity B
Prepare the test film of 20cm * 20cm, be installed on the testing stand.Test film is fixed on the chuck that is spaced apart 1cm.Curvature K=-2.5～+ 2.5cm
-1Scope in, test film is carried out the pure bending of uniform velocity curvature.Deformation velocity is 0.50cm
-1/ sec carries out 1 cycle (cycle) distortion.Bending rigid value B is according to the record of above-mentioned " standardization of hand valuation and parsing ", be to be that the inclinometer of the moment of flexure theory between 0.5～1.5 and-0.5～-1.5 is calculated by curvature, but in the mensuration of nonwoven fabric, between this curvature, might bend, be difficult to obtain correct mensuration numerical value.Therefore, the flexural rigidity B among the present invention is calculated by the inclination of 0～maximum deflection square value and 0～minimum bend square value.MD and CD also carry out this mensuration simultaneously, calculate mean value by following formula (4), with it as flexural rigidity B.
Flexural rigidity B={ (B
MD 2+ B
CD 2)/2}
1/2(4)
The feel of nonwoven fabric
From the viewpoint of flexibility and flatness the feel of nonwoven fabric has been carried out functional evaluation.Being represented as object with 10 estimates according to following 5 ranks.The result represents with 10 people's average.
About flexibility
" softness and feel are good "
5: meet
4: roughly meet
3: being unable to say for certain meets or does not meet
2: not too meet
1: do not meet
About flatness
" level and smooth and feel good "
5: meet
4: roughly meet
3: being unable to say for certain meets or does not meet
2: not too meet
1: do not meet
Table 1
* in embodiment 1 and 2, the stereo crimped fiber that is deformed into flat pattern roughly is orientated on the in-plane of nonwoven fabric.
Clear as can be known from the result shown in the table 1, in the resulting nonwoven fabric of embodiment, the relative axis direction of the coiling direction of stereo crimped fiber tilts, and the cross section of fiber is flat pattern, therefore judges that this nonwoven fabric is the low and soft product of flexural rigidity.And can judge that this nonwoven surface is level and smooth and feel is good.
As above detailed description, the coiling direction of the stereo crimped fiber that comprises in the nonwoven fabric of the present invention tilts with respect to axis direction, so nonwoven surface is level and smooth, and rigidity is low when bending, is the product of the good softness of softness and drapability.
Claims (7)
1. nonwoven fabric, it comprises stereo crimped fiber, and the coiling direction of this stereo crimped fiber becomes the following angle θ of 55 degree to tilt with respect to axis direction.
2. nonwoven fabric according to claim 1, wherein the transverse shape of stereo crimped fiber is a flat pattern.
3. nonwoven fabric according to claim 1, the 2nd layer of another surface that it has the 1st layer an of surface comprising this nonwoven fabric and comprises this nonwoven fabric, the 1st layer surface of wherein said nonwoven fabric is made of the concaveconvex shape with a large amount of jogs, comprises in the 2nd layer of another surface of this nonwoven fabric and contains described stereo crimped fiber.
4. nonwoven fabric according to claim 3 wherein also comprises stereo crimped fiber in the 1st layer, and the ratio of the stereo crimped fiber that comprises in the 2nd layer is higher than the ratio of the stereo crimped fiber that comprises in the 1st layer.
5. nonwoven fabric according to claim 4, wherein the 1st layer density is lower than the 2nd layer density.
6. absorbent commodity, as face sheet, described nonwoven fabric comprises stereo crimped fiber with nonwoven fabric for it, and the coiling direction of this stereo crimped fiber becomes the following angle θ of 55 degree to tilt with respect to axis direction.
7. the manufacture method of a nonwoven fabric, it comprises: form the fiber web that comprises the potential crimping property fiber, make between this fibroreticulate formation fiber melt bonded, when this is melt bonded or make described potential crimping property fiber show three-dimensional curling afterwards, implement calendering processing then and make and show the three-dimensional fibre deformation that curls, and the coiling direction of fiber is tilted with respect to axis direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005066201 | 2005-03-09 | ||
| JP066201/2005 | 2005-03-09 |
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| Publication Number | Publication Date |
|---|---|
| CN1831228A CN1831228A (en) | 2006-09-13 |
| CN1831228B true CN1831228B (en) | 2010-05-12 |
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ID=36993713
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100588911A Active CN1831228B (en) | 2005-03-09 | 2006-03-08 | Nonwoven |
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| TW (1) | TW200639287A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5842353B2 (en) * | 2010-04-13 | 2016-01-13 | Jnc株式会社 | Bulky nonwoven fabric |
| KR102188219B1 (en) * | 2013-11-01 | 2020-12-08 | 주식회사 쿠라레 | Nubuck-leather-like sheet and manufacturing process therefor |
| WO2016027361A1 (en) * | 2014-08-22 | 2016-02-25 | 株式会社クラレ | Conductive nonwoven fabric and manufacturing method for melt-blown nonwoven fabric used in conductive nonwoven fabric |
| US20200155374A1 (en) * | 2017-06-30 | 2020-05-21 | Daiwabo Holdings Co., Ltd. | Sheet for absorbent article and absorbent article |
| CN109468752B (en) * | 2019-01-09 | 2020-11-10 | 江阴健发特种纺织品有限公司 | Multilayer spinning-melting composite kitchen wiping material and preparation method thereof |
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| US4353956A (en) * | 1981-06-05 | 1982-10-12 | Nalle George S Jr | Helical net |
| CN2325406Y (en) * | 1998-05-07 | 1999-06-23 | 苏州大学 | Shaped non-woven fabrics |
| CN1308692A (en) * | 1998-06-11 | 2001-08-15 | 罗狄亚特性纤维公司 | Use of three-dimensional crimping fibres for making staying material, and resulting staying material |
| CN1384236A (en) * | 2002-06-12 | 2002-12-11 | 张立文 | Non-woven fabric of down with crimped fiber and its production process |
| WO2003027366A1 (en) * | 2001-09-28 | 2003-04-03 | E. I. Du Pont De Nemours And Company | Stretchable nonwoven web and method therefor |
| JP2003105661A (en) * | 2001-09-27 | 2003-04-09 | Shingo Satomura | Silk nonwoven fabric and method for producing the same |
| CN1452672A (en) * | 2000-04-18 | 2003-10-29 | 乐曼两合有限公司 | Non-woven textile structure incorporating stabilized filament assemblies |
| JP2003342865A (en) * | 2002-05-29 | 2003-12-03 | Japan Vilene Co Ltd | Cover material, filtering material for gas removal using the same and gas-removing unit |
-
2006
- 2006-03-03 TW TW095107328A patent/TW200639287A/en not_active IP Right Cessation
- 2006-03-08 CN CN2006100588911A patent/CN1831228B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4353956A (en) * | 1981-06-05 | 1982-10-12 | Nalle George S Jr | Helical net |
| CN2325406Y (en) * | 1998-05-07 | 1999-06-23 | 苏州大学 | Shaped non-woven fabrics |
| CN1308692A (en) * | 1998-06-11 | 2001-08-15 | 罗狄亚特性纤维公司 | Use of three-dimensional crimping fibres for making staying material, and resulting staying material |
| CN1452672A (en) * | 2000-04-18 | 2003-10-29 | 乐曼两合有限公司 | Non-woven textile structure incorporating stabilized filament assemblies |
| JP2003105661A (en) * | 2001-09-27 | 2003-04-09 | Shingo Satomura | Silk nonwoven fabric and method for producing the same |
| WO2003027366A1 (en) * | 2001-09-28 | 2003-04-03 | E. I. Du Pont De Nemours And Company | Stretchable nonwoven web and method therefor |
| JP2003342865A (en) * | 2002-05-29 | 2003-12-03 | Japan Vilene Co Ltd | Cover material, filtering material for gas removal using the same and gas-removing unit |
| CN1384236A (en) * | 2002-06-12 | 2002-12-11 | 张立文 | Non-woven fabric of down with crimped fiber and its production process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1831228A (en) | 2006-09-13 |
| TW200639287A (en) | 2006-11-16 |
| TWI359887B (en) | 2012-03-11 |
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