CN101166858A - Stretch sheet and process for producing the same - Google Patents
Stretch sheet and process for producing the same Download PDFInfo
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- CN101166858A CN101166858A CNA200680014098XA CN200680014098A CN101166858A CN 101166858 A CN101166858 A CN 101166858A CN A200680014098X A CNA200680014098X A CN A200680014098XA CN 200680014098 A CN200680014098 A CN 200680014098A CN 101166858 A CN101166858 A CN 101166858A
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Abstract
A process for stretch sheet production which comprises stretching either a strip-form layered sheet (10A) comprising an elastic layer (1) having elastic stretchability and non-elastic fibrous layers (2) and (3) which are substantially non-elastic and have been partly bonded to the elastic layer (1) or a fibrous sheet comprising an elastic ingredient and a substantially non-elastic ingredient and partly having embossed parts formed by embossing. The stretching is conducted using the bonding parts (4) where the two kinds of layers are bonded to each other or the embossed parts, as base points. Thus, a stretch sheet (10) is obtained. The stretch sheet has protrusions and grooves extending in the direction perpendicular to the stretching direction, the bonding parts (4) or embossed parts being formed in the protrusions.
Description
Technical field
The present invention relates to the drawing process and the Stretchable sheet of manufacture method, laminated sheet or the fibre sheet material of Stretchable sheet.
Background technology
Known a kind of sheet material that will have an elastic shrinkage be essentially stiff sheet material and carry out imposing after part combines stretch process to obtain the method for Stretchable sheet.For example, in EP0556749A1, put down in writing the manufacture method of following elastic composite body: the sheet elastomer that will relax state and the sheet base material that has the extensibility identical but do not have an elongation recovery with this elastomer on the length direction (MD) continuously, combination discontinuously on width (CD), after forming the elastic composite body, at this elastic composite body of the scope in-draw of blocking, destroying that base material does not take place to the boundary that stretches, after making base material produce permanent deformation, making stretches relaxes.
But, in the manufacture method of above-mentioned Stretchable sheet in the past, according to the degree difference that stretches, might take place when stretch process, to peel off between 2 sheet materials of part combination, the TENSILE STRENGTH of the Stretchable sheet of manufacturing is insufficient or fluffing takes place or destroy or feel and degraded appearance.In order to prevent this undesirable condition, the percentage elongation when having considered to suppress stretch process etc., but be difficult to obtain the sheet material of high scalability in such cases.
Summary of the invention
The invention provides a kind of manufacture method of Stretchable sheet, wherein, to contain elastic layer and be essentially stiff non-elastic fiber layer with elastic extension, and above-mentionedly two-layerly carry out part to engage the laminated sheet form be that basic point stretches with above-mentioned two-layer junction surface each other, thereby obtain Stretchable sheet when mentioning the 1st invention (below be meant this invention).
In addition, the present invention also provides a kind of manufacture method of Stretchable sheet, wherein, to contain elastic component and be essentially stiff composition, and the fibre sheet material that is formed with the part embossed portion that produces by embossing processing is that basic point stretches with above-mentioned embossed portion, thereby obtains Stretchable sheet when mentioning the 2nd invention (below be meant this invention).
In addition, the present invention also provides a kind of manufacture method of Stretchable sheet, this method comprises following stretching process: will contain the elastic layer with elastic extension and be essentially stiff non-elastic fiber layer, and the two-layer part of carrying out engages the belt course stacks of sheets that forms, perhaps will contain elastic component and be essentially stiff composition, and the ribbon-like fibre sheet material that is formed with the part embossed portion that produces by embossing processing is inserted between a pair of concavo-convex roller, described a pair of concavo-convex roller is for alternately being formed with a pair of concavo-convex roller of large-diameter portion and minor diameter part on the axial length direction, and the mode that loosely is embedded in according to the large-diameter portion of a concavo-convex roller between the large-diameter portion of another concavo-convex roller is combined; Wherein, in described stretching process, make on the width of above-mentioned laminated sheet or above-mentioned fibre sheet material above-mentioned two-layer each other the junction surface or the position consistency of the large-diameter portion of the position of above-mentioned embossed portion and concavo-convex roller, this laminated sheet or above-mentioned fibre sheet material are stretched on its width.
In addition, the present invention also provides a kind of drawing process of laminated sheet, wherein, will contain elastic layer and be essentially stiff non-elastic fiber layer, and two-layerly carry out part to engage the laminated sheet that forms be that basic point stretches with above-mentioned two-layer junction surface each other with elastic extension.
In addition, the present invention also provides a kind of drawing process of fibre sheet material, wherein, will contain elastic component and be essentially stiff composition, and the fibre sheet material that is formed with the part embossed portion that produces by embossing processing is that basic point stretches with the embossed portion.
In addition, the present invention also provides a kind of Stretchable sheet, it contains the elastic layer with elastic extension and is essentially stiff non-elastic fiber layer, and the junction surface that two-layer joint forms is formed on a plurality of positions of draw direction of sheet material, wherein, have at least one face of described Stretchable sheet respectively along the protrusion and the concave part that extend with the direction of above-mentioned draw direction approximate vertical, this protrusion and this concave part alternately are formed on the above-mentioned draw direction, and be formed with a plurality ofly respectively, above-mentioned junction surface is positioned on the above-mentioned protrusion at least.
In addition, the present invention also provides a kind of Stretchable sheet, it contains elastic component and is essentially stiff composition, and on a plurality of positions of the draw direction of sheet material, be formed with the part embossed portion that produces by embossing processing, wherein, have at least one face of described Stretchable sheet respectively along the protrusion and the concave part that extend with the direction of above-mentioned draw direction approximate vertical, this protrusion and this concave part alternately are formed on the above-mentioned draw direction, and be formed with a plurality ofly respectively, above-mentioned embossed portion is positioned on the above-mentioned protrusion at least.
Description of drawings
The schematic diagram of the manufacturing installation of the Stretchable sheet that uses in the embodiment of Fig. 1 for the manufacture method of expression Stretchable sheet of the present invention.
Fig. 2 is the vertical view of an example of the laminated sheet of enforcement stretch process among expression the present invention.
Fig. 3 (a)～Fig. 3 (d) is the schematic section of the CD direction of laminated sheet shown in Figure 2, Fig. 3 (a) for expression along figure, the Fig. 3 (b) in the cross section of the I-I line of Fig. 2 for be illustrated in the state (making the state of its stretching) that deforms between the concavo-convex roller corresponding to figure, the Fig. 3 (c) in the cross section of Fig. 3 (a) for expression along figure, the Fig. 3 (d) in the cross section of the II-II line of Fig. 2 for being illustrated in the figure corresponding to the cross section of (c) of the state (making the state of its stretching) that deforms between the concavo-convex roller.
Fig. 4 (a) and Fig. 4 (b) for expression will laminated sheet shown in Figure 2 along the stretch schematic diagram of the flexible nonwoven fabrics (Stretchable sheet) that obtains of CD direction, Fig. 4 (a) for expression corresponding to figure, the Fig. 4 (b) in the cross section in the I-I line cross section of Fig. 2 for representing figure corresponding to the cross section in the II-II line cross section of Fig. 2.
Fig. 5 (a) and Fig. 5 (b) are the figure of an embodiment of expression Stretchable sheet of the present invention, and Fig. 5 (a) is a sectional view along Fig. 5 (a) III-III line for diagrammatic top view, Fig. 5 (b) of the face of the non-elastic fiber layer side of expression flexible nonwoven fabrics (Stretchable sheet).
Fig. 6 is used for the figure of an example of stretching device that laminated sheet or fibre sheet material are stretched on the MD direction for expression.
Fig. 7 is used for the figure of another example of stretching device that laminated sheet or fibre sheet material are stretched on the MD direction for expression.
Fig. 8 is used for the figure of another example of stretching device that laminated sheet or fibre sheet material are stretched on the MD direction for expression.
The specific embodiment
Following basis is preferred embodiment with reference to description of drawings the present invention.
In the 1st embodiment of the present invention, shown in Fig. 3 (a) and Fig. 3 (c), stacked respectively the stiff the 2nd and the 3rd fibrage (non-elastic fiber layer) 2,3 that is essentially on the two sides of the 1st fibrage (elastic layer) 1 with elastic extension carries out part to above-mentioned layer with regular pattern and engages the laminated sheet 10A enforcement stretch process that forms.
In the present embodiment, for example can use the laminated sheet 10A that obtains as shown in Figure 1.Promptly, on the fiber web (the 3rd fibrage) 3 of supplying with and go up continuous conveyance by the 1st carding machine 21, supply with the elastomer 1 ' that is shaped by fibre forming machine 22, on this fiber web 3, form layer (the 1st fibrage) 1 that constitutes by elastomer 1 ' continuously in a direction (flow direction, MD).And then, after supplying with the fiber web of supplying with by the 2nd carding machine 23 (the 2nd fibrage) 2 thereon continuously, implement hot blasts for the laminated sheet 10B of the 3-tier architecture of gained by the drying machine 24 of hot blast mode and handle, process by having in the laminated sheet 10B enforcement embossing of disposing regularly on the side face after embossing is handled with 25 pairs of hot blasts of embossing device of the backing roll 27 of the knurling rolls 26 of protuberance and relative configuration with it.Thus, shown in Fig. 2 and Fig. 3 (a) and Fig. 3 (c), obtain to be formed with the laminated sheet 10A at junction surface 4 with regular pattern.
In the manufacture method of above-mentioned laminated sheet 10A, though for the heat fusing of elastomer and non-elastic fiber bonding and entering of fiber and carried out utilizing the hot blast of drying machine 24 to handle, also can omit this hot blast and handle.
Preferred formation to laminated sheet 10A describes.
The 1st fibrage (elastic layer) 1 has the character that can stretch and shrink when discharging from tensile force, on parallel with a face at least direction, the residual deformation when it is shunk is that the residual deformation below 20%, when more preferably it being shunk is below 10%.Satisfy on preferred any one direction in MD direction and CD direction at least of these values, more preferably on both direction, satisfy.The maximum elongation rate is preferably 30～500%, is preferably 300～500% especially.
The 1st fibrage (elastic layer) 1 preferably contains the elastomer that is made of elastomeric material.As elastomeric material, can list thermoplastic elastomer (TPE), rubber, ethylene-propylene copolymer etc., wherein, the viewpoint from fibrous elastomer can be shaped with comparalive ease is preferably thermoplastic elastomer (TPE).As thermoplastic elastomer (TPE), can list polyurethane, polystyrene (SBS, SIS, SEBS, SEPS etc.), olefin-based (copolymer of ethene, propylene, butylene etc. etc.), vinyl chloride, polyester system etc.These materials can be used alone or make up more than 2 kinds and use.
The containing ratio of the elastomer that is made of elastomeric material in the 1st fibrage 1 is preferably 50～100 weight %, is preferably 75～100 weight % especially.In the 1st fibrolaminar elastomer resin, can also contain non-resilient resins such as polyethylene, polypropylene, polyester (PET or PBT), nylon or organic or inorganic pigment, various additive (antioxidant, plasticizer etc.).In addition, can contain non-elastic fiber, organic or inorganic pigment in first fibrage.
As elastic layer, can also use film shape, netted elastic layer to wait to replace the elastic layer that constitutes by fibrage.As the formation material of film or net, can use above-mentioned various elastomeric material.
The the 2nd and the 3rd fibrage (non-elastic fiber layer) is essentially non-resilient though 2,3 have extensibility.Here said extensibility can be the situation that constitutes the fiber itself elongation; Even also can be to constitute fiber itself not extend, thereby but have taken place at intersection point place between the fiber to separate between the two bonding fibers of heat fusing or the formed stereochemical structure of plurality of fibers structurally changes or constitutes fiber that the broken situation of extending of taking place with fibrolaminar form takes place because the heat fusing between the fiber is bonding etc.
As the fiber that constitutes the non-elastic fiber layer, can list polyethylene, polypropylene, polyester (PET or PBT), nylon etc. or the fiber that constitutes by Biodegradable resins such as PLAs etc.The fiber that constitutes the non-elastic fiber layer can be that staple fibre also can be a long fiber, can be that hydrophily also can be hydrophobic.In addition, can also use core-sheath-type composite fibre, cut apart fiber, profiled fibre, crimped fibre, heat-shrinkable fibre etc.These fibers can be used singly or in combination of two or more thereof.Particularly when being staple fibre, easily cause fluffing owing to stretch, if but use this method, then be difficult to cause the destruction at junction surface, therefore the intensity height can be obtained and fluffing can be prevented, the product that the skin sense of touch is good is preferred from this point.
For example shown in Fig. 2 and Fig. 3 (a) and Fig. 3 (c) like that, junction surface 4 preferably forms on the flow direction (MD) of laminated sheet 10A and this both direction of vertical direction (CD) thereof discontinuously.In addition, from obtaining the viewpoint of the good flexible nonwoven fabrics (Stretchable sheet) of skin sense of touch, preferred the 2nd fibrage of laminated sheet 10A and/or the 3rd fibrolaminar junction surface 4 form recess on laminated sheet 10A surface, part in addition becomes protuberance.
In the 1st embodiment, as mentioned above, to the laminated sheet 10A enforcement stretch process of 3-tier architecture.
In the 1st embodiment, shown in Fig. 1 and Fig. 3 (b) and Fig. 3 (d), use has the stretching device 30 of a pair of concavo- convex roller 33,34 that alternately is formed with large- diameter portion 31,32 and minor diameter part (not shown) on the axial length direction respectively, laminated sheet 10A is gone up in the direction vertical with its flow direction (CD) stretch.
Constituting of stretching device 30: make the hinge portion displacement up and down of one or two concavo- convex roller 33,34 by known elevating mechanism, thereby can regulate the interval between two rollers 33,34.
In the method for present embodiment, such shown in Fig. 1 and Fig. 3 (b) and Fig. 3 (d), mode between the large-diameter portion 31 that loosely be embedded between the large-diameter portion 32 of another concavo-convex roller 34 according to the large-diameter portion 31 of a concavo-convex roller 33, the large-diameter portion 32 of another concavo-convex roller 34 loosely is embedded in an above-mentioned concavo-convex roller 33 makes up each concavo- convex roller 33,34, insert layer stacks of sheets 10A between two rollers 33,34 of this state stretches this laminated sheet 10A.
In this stretching process, shown in Fig. 2 and Fig. 3 (a)～Fig. 3 (d), make the position consistency of the large- diameter portion 31,32 of the position at the junction surface 4 on the width of laminated sheet 10A and concavo-convex roller 33,34.Specifically, as shown in Figure 2, be formed with many junction surfaces row on laminated sheet 10A, this junction surface be listed as by a plurality of junction surfaces 4 and connects on the MD direction and linearity ground arrangement and form (having shown 10 among Fig. 2), in Fig. 2, for to be positioned at the junction surface row R of the leftmost side
1For starting point, begin thus every one junction surface row R
1The junction surface of containing respectively makes the position consistency of the large-diameter portion 31 of a concavo-convex roller 33; For be positioned at the left side the 2nd junction surface row R
2For starting point, begin thus every one junction surface row R
2The junction surface of containing respectively makes the position consistency of the large-diameter portion 32 of another concavo-convex roller 34.The scope shown in the symbol 31,32 is illustrated in the moment that laminated sheet 10A is inserted into the state between the two concavo- convex rollers 33,34 among Fig. 2, with the equitant scope of side face of the large- diameter portion 31,32 of each roller.
According to present embodiment, when laminated sheet 10A passes through between the concavo- convex roller 33,34, shown in Fig. 3 (b) and Fig. 3 (d), junction surface 4 is overlapping with the large- diameter portion 31,32 of any one concavo-convex roller, and not and the zone between the overlapping large-diameter portion of large- diameter portion 31,32, be that zone between the row of above-mentioned junction surface is stretched energetically.Like this,, can prevent the destruction (interlayer peel off etc.) at junction surface 4, simultaneously the part beyond the junction surface of tensile layer stacks of sheets 10A efficiently by being basic point tensile layer stacks of sheets 10A with junction surface 4.In addition, by this stretching, shrink the variation that also can not reply at the 2nd and the 3rd fibrage (non-elastic fiber layer) even if produce laminated sheet 10A on 2,3, by this variation, the degree that the 2nd and the 3rd fibrage (non-elastic fiber layer) 2,3 obstruction elastic fibrous layers freely stretch reduces greatly.
Thus, according to present embodiment, can make high scalability, skin soft-touch, intensity height efficiently, break or fluff the good flexible nonwoven fabrics of few outward appearance (Stretchable sheet).
As at the 2nd and the 3rd fibrage (non-elastic fiber layer) even if the laminated sheet 10A that produces on 2,3 shrinks the variation that also can not reply, as mentioned above, can list and constitute that fiber can not stretch with replying or taken place to separate between the two bonding fibers of heat fusing at the intersection point place between the fiber or and the stereochemical structure recurring structure that by plurality of fibers form on variation or constitute fiber fragmentation etc. bonding etc. owing to the heat fusing between the fiber.But,, constitute that fiber has preferably taken place to separate between the two bonding fibers of heat fusing or to constitute fiber partly broken with the not serious degree of fluffing from obtaining the viewpoint of the good flexible nonwoven fabrics (Stretchable sheet) of skin sense of touch.
Fig. 4 (a) and Fig. 4 (b) are illustrated in the cross section of the flexible nonwoven fabrics 10 that obtains in the manufacture method of the 1st embodiment.Fig. 4 (a) is the cross section corresponding to the II-II line cross section of Fig. 2 corresponding to the cross section in the I-I line cross section of Fig. 2, Fig. 4 (b).
In addition, Fig. 5 (a) is the sectional view along the III-III line of Fig. 5 (a) for diagrammatic top view, Fig. 5 (b) of the face of non-elastic fiber layer 2 side of expression flexible nonwoven fabrics 10.
Flexible nonwoven fabrics 10 has to be laminated with respectively on the two sides of the 1st fibrage (elastic layer) 1 with elastic extension and is essentially the stiff the 2nd and the 3rd fibrage (non-elastic fiber layer) 2,3 structures that form shown in Fig. 5 (b).And, on a plurality of positions of the draw direction (D1 direction among the figure) of flexible nonwoven fabrics (Stretchable sheet) 10, be formed with from the 2nd fibrage 2 to the 3rd fibrages 3 integrated junction surface 4,4 on thickness direction.
Here, draw direction is meant that elastic layer and non-elastic fiber layer two-layer carried out part to be engaged the laminated sheet that forms or contain elastic component and the fibre sheet material that is essentially stiff composition and is formed with the part embossed portion stretches and implements the direction that stretches when obtaining Stretchable sheet, is meant the direction parallel with the face of sheet material.In Stretchable sheet, draw direction is flexible direction, when when Stretchable sheet can't be confirmed draw direction, with the maximal dilation direction of flexible direction as draw direction.The maximal dilation direction only on the direction in the direction parallel with the face of this sheet material when flexible, is this direction at Stretchable sheet; When on flexible a plurality of directions of sheet material in the direction parallel with the face of this sheet material when flexible, direction that will be vertical with the minimum direction of the percentage elongation (maximum elongation rate) of point of maximum intensity in the draw direction of tension test is as the maximal dilation direction.
The flexible nonwoven fabrics 10 of present embodiment is that above-mentioned laminated sheet 10A go up is stretched and obtains at width (CD direction), and the direction identical with the width of laminated sheet 10A is rich in retractility most.Therefore, the direction identical with the width of laminated sheet 10A, be draw direction and be the maximal dilation direction perpendicular to the direction (CD) of operating direction (MD) during fabrication in other words.
Flexible nonwoven fabrics 10 has a plurality of protrusions 12 and a plurality of concave part 13 respectively on its two sides shown in Fig. 4 (a), Fig. 4 (b), Fig. 5 (a) and Fig. 5 (b).And, on any of flexible nonwoven fabrics 10, protrusion 12 and concave part 13 be respectively along extending with the direction (D2 direction among the figure) of draw direction (D1 direction among the figure) approximate vertical of flexible nonwoven fabrics 10, and go up alternately at draw direction (D1 direction among the figure) and to form.
Like this, on draw direction, alternately be formed with protrusion 12 and concave part 13 respectively on the two sides of flexible nonwoven fabrics 10.Thus, the microcosmic ground, cross section of flexible nonwoven fabrics 10 becomes wave-like.The stretch process of this wave-like when making flexible nonwoven fabrics 10 generates.This wave-like produces and gives the result of flexible nonwoven fabrics 10 retractilities, can't cause bigger harmful effect to the feel of nonwoven fabric 10 itself, can obtain more soft, good nonwoven fabric.
In the flexible nonwoven fabrics 10 of present embodiment, on the length direction of concave part 13, also be formed with a plurality of junction surfaces 4 discontinuously, this junction surface 4 is positioned at the substantial middle of the width of concave part 13.
By on protrusion 12, forming junction surface 4, can prevent the generation of fluffing.
In Stretchable sheet of the present invention, so long as get final product in the position formation that is protrusion when any one face side of this Stretchable sheet is observed.That is, being viewed as on the position of concave part even if the junction surface is formed on from a face side of Stretchable sheet, is protrusion when needing only this concave part from other face side observation, and then this junction surface is the junction surface that is formed on the protrusion.
In addition, the junction surface row R that is positioned at protrusion 12 of the flexible nonwoven fabrics 10 of present embodiment
1With the junction surface row R that is positioned at adjacent grooves portion 13
2Between the zone can stretch, on the contrary, be positioned at the junction surface row R of protrusion 12
1With the junction surface row R that is positioned at concave part 13
2Even if not flexible or flexible its telescopic level are also less than the zone between the row of junction surface in fact.Here, the junction surface row R of protrusion 12
1Overlapping with a plurality of junction surfaces 4 of each protrusion 12, be the width belt-like zone identical in fact with the width at each junction surface 4.The junction surface row R of concave part 13
2Overlapping with a plurality of junction surfaces 4 of each concave part 13, be the width belt-like zone identical in fact with the width at each junction surface 4.
For breakable layer stacks of sheets 10A not (fibre sheet material in the 2nd invention), the side face of the large-diameter portion of concavo-convex roller is preferably not sharp-pointed, shown in Fig. 3 (b) and Fig. 3 (d), is preferably the tabular surface of Rack.The width W of large-diameter portion front end face [with reference to Fig. 3 (b)] is preferably 0.3～1mm, is preferably 0.7～2 times of CD direction size of junction surface 4, is preferably 0.9～1.3 times especially.
In addition, the spacing P[between large-diameter portion is with reference to Fig. 3 (b)] be preferably 0.7～2.5mm, be preferably 1.2～5 times of CD direction size of junction surface 4, be preferably 2～3 times especially.Can obtain the same outward appearance of cloth thus, the skin sense of touch is good.In addition, the spacing of the CD direction at the junction surface 4 of laminated sheet 10A (adjacent junction surface row R on the CD direction
1Between spacing or the CD direction on adjacent junction surface row R
2Between spacing) P1[is with reference to Fig. 3 (a)], with respect to the spacing P between large-diameter portion, be 2 times substantially, but for elongation or the contract width of cloth of laminated sheet 10A on the CD direction, if in 1.7 times～2.3 times scope, can make position consistency in order to make the position relationship consistency.Be set at this ratio by the spacing P1 with spacing P between large-diameter portion and junction surface 4, what can stably make laminated sheet 10A has being positioned at and the contacted position of large-diameter portion of junction surface row partially stabilizedly.And the part of passing through between the large-diameter portion of laminated sheet 10A is compared with the part that is contacted with large-diameter portion, is stretched by high magnification ground.The part of laminated sheet 10A and large-diameter portion crimping concavo-convex roller with compare by the part between the large-diameter portion, stretching ratio is lower, the position of position and large-diameter portion that therefore has the part of junction surface row is difficult to misplace on draw direction.
As the junction surface 4 with elastic layer and non-elastic fiber layer is the method for basic point tensile layer stacks of sheets 10A, except as above-mentioned embodiment, make the position at junction surface 4 and concavo-convex roller large- diameter portion 31,32 position consistency and make outside 31,32 methods that stretch energetically of large-diameter portion the method that can also use Japanese kokai publication hei 6-133998 communique to be put down in writing.
In addition, in the method shown in Fig. 3 (a)～Fig. 3 (d), though be to enlarge space between the minor diameter part of the large-diameter portion of a concavo-convex roller and another concavo-convex roller, stretch with the formation that between its large-diameter portion and minor diameter part, does not accompany laminated sheet 10A, but also can dwindle interval between the two, stretch with the formation that accompanies laminated sheet 10A.
By above-mentioned stretch process, the thickness of laminated sheet 10A preferably is increased to 1.1 times～3 times, especially preferably is increased to 1.3 times～2 times before and after stretch process.Thus, the fiber generation plastic deformation of non-elastic fiber layer 2,3 and stretching, fiber attenuates thus, and meanwhile, non-elastic fiber layer 2,3 becomes more bulk, and the skin sense of touch is good, resiliency is good.
The thickness of laminated sheet 10A if be stretched before the processing is thin, then has the advantage in the space of the roller stock that can reduce conveyance and keeping laminated sheet 10A.
In addition, by above-mentioned stretch process, compare advantageous variant before the flexural rigidity of laminated sheet 10A and the stretch process and be 30～80%, special advantageous variant is 40～70%.Thus, can obtain good, the soft nonwoven fabric of drapability.In addition, the flexural rigidity height of the laminated sheet 10A before the processing that preferably is stretched, its reason is to be difficult to produce gauffer at conveyance circuit middle level stacks of sheets 10A.And laminated sheet 10A can not produce gauffer yet when stretch process, is easy to processing, and is therefore preferred.
Thickness and the flexural rigidity of laminated sheet 10A before and after the stretch process can be controlled according to the spacing of non-elastic fiber layer 2,3 used elongation of fiber rate, the embossed pattern of knurling rolls, concavo- convex roller 33,34 or thickness, the interlock amount of leading section.
If Stretchable sheet of the present invention in the quantity at junction surface its more than 40%, preferred be to be that basic point stretches with the junction surface more than 70%, then can obtain the sheet material that high scalability, feel and outward appearance are good, maximum intensity is also high, bulk, resiliency is excellent.
In the 2nd embodiment of the present invention, to containing elastic component and being essentially stiff composition and being formed with the single layer fibre sheet material enforcement stretch process of processing the part embossed portion that produces by embossing.
As the fibre sheet material of the 2nd embodiment, can use that (1) is made of elastic component at core, sheath portion is essentially core-sheath-type composite fibre that stiff composition constitutes or by elastic component be essentially on parallel type that stiff composition constitutes or the fiber web that composite fibre constituted of most Splittables or the nonwoven fabric of various method for makings etc. to be formed with the fibre sheet material of the embossed portion that produces by embossing processing with the same pattern of above-mentioned the 1st embodiment; (2) on the fiber web that contains elastomer and non-elastic fiber with admixture or the nonwoven fabric of various method for makings etc. to be formed with the fibre sheet material etc. of the embossed portion that produces by embossing processing with the same pattern in the junction surface of above-mentioned the 1st embodiment.As the object lesson of fibre sheet material, can list at the fiber web that utilizes combing method to obtain or the fiber web that forms by spinning such as spun-bond process, meltblown, current crossed fiber net, be formed with when overlooking in a large number fibre sheet material by warm-up mill on the net for the heat fusing adhesive portion of the point-like of loosing at the acupuncture crossed fiber.
As elastic component, can list the constituent material of above-mentioned elastomer.As being essentially stiff composition, can list the constituent material of above-mentioned non-elastic fiber.
In the 2nd embodiment, the stretching of fibre sheet material is that basic point carries out with the embossed portion.As its method, so long as with the 1st embodiment in be that basic point tensile layer stacks of sheets similarly is that basic point drawing of fiber sheet material gets final product with the embossed portion with the junction surface.For example, in above-mentioned the 1st embodiment, aligned in position with the large-diameter portion of junction surface 4 and concavo-convex roller, and the laminated sheet 10A of 3-tier architecture is inserted in the concavo-convex roller, and replace in the present embodiment, with the aligned in position of the large-diameter portion of embossed portion and concavo-convex roller, the fibre sheet material of individual layer is inserted in the concavo-convex roller.
By being the fibre sheet material stretching that basic point will have embossed portion with the embossed portion, can prevent the breakage of embossed portion, the while is stretching part in addition efficiently.
In addition, similarly be formed with along the protrusion and the concave part that extend with the direction of draw direction approximate vertical with above-mentioned flexible nonwoven fabrics 10 respectively on the two sides of gained Stretchable sheet, this protrusion and this concave part alternately are formed with a plurality of on above-mentioned draw direction respectively.In addition, embossed portion is positioned on these protrusions and the concave part.Stretch process to the single layer fibre sheet material is also preferably carried out under the condition identical with the condition that above-mentioned laminated sheet 10A is carried out stretch process.
The flexible nonwoven fabrics (Stretchable sheet) that obtains by manufacture method of the present invention can also use in various uses such as clothes, cleaning sheet material, automobile, furniture, bedding, especially preferably uses as the constituent material with absorbent commodities such as the contacted article of health, sanitary napkin or disposable diapers.For example, can be used as and be used for the uses such as sheet material of giving elastic extension waist portion or waist, the leg perimembranous etc. of disposable diaper.In addition, can be used as the uses such as sheet material of the retractility alar part that forms sanitary napkin.In addition, even if also can in the position etc. of retractility is also wanted to give in position in addition, use.The flexible nonwoven fabrics of formation (2 layers or 3-tier architecture) that is laminated with elastic layer and non-elastic fiber layer is on being used to be contacted with the position of wearer skin the time, from skin sense of touch and the viewpoint that prevents to be clamminess etc., preferably according to using the non-elastic fiber layer towards the mode of the skin side of wearer.The drawing process of laminated sheet of the present invention or fibre sheet material uses in the manufacture method particularly preferably in flexible nonwoven fabrics (Stretchable sheet) as above-mentioned embodiment, but also can use in purposes in addition.
The present invention is not restricted to above-mentioned embodiment.For example, the laminated sheet 10A that uses in the 1st embodiment is 3-tier architecture, but also can use the sheet material that only is laminated with the non-elastic fiber layer on any one face side of the 1st fibrage (elastic layer) equally.In addition, the configuration of the embossed portion of the junction surface of the 1st invention and the 2nd invention can not be jagged pattern, but forms with other pattern.The configuration pattern of the junction surface of laminated sheet or the embossed portion of fibre sheet material can be multiple pattern, for example be listed between the adjacent junction surface row at upwardly extending above-mentioned junction surface, the MD side of pattern shown in Figure 2, the position at junction surface can be identical, perhaps also can have the different junction surface row in position at junction surface more than 3 kinds.When making it flexible on the CD direction, the junction surface can be on the MD direction continuously; When making it flexible on the MD direction, the junction surface can be on the CD direction continuously.If the junction surface row are positioned at the large-diameter portion of concavo-convex roller, then can be the junction surface therebetween.
In addition, the junction surface of the 1st invention can not form by heat embossing yet, but by formation such as ultrasonic wave embossed, high frequency embossing, adhesives.The embossed portion of the 2nd invention can also be by formation such as ultrasonic wave embossed, high frequency embossing except heat embossing.The plan view shape of junction surface and embossed portion can also be ellipse, triangle, rectangle etc. except circle, and perhaps the junction surface of these shapes more than 2 kinds or embossed portion also can be formed on laminated sheet or the fibre sheet material.
And then in the respective embodiments described above, laminated sheet or fibre sheet material are to stretch on the CD of flow direction direction, but also can stretch on the MD direction.
For example, can use the stretching device shown in Fig. 6～7.Stretching device shown in Figure 6 has on mutually relative face and is formed with many at a pair of buckplate 37 perpendicular to the upwardly extending convex strip portions 36 in the side of directions X, each buckplate is constituted use cam gear displacement to dwindle mutual distance so that can enlarge.When tensile layer stacks of sheets or fibre sheet material, under the position of the junction surface of and laminated sheet consistent with directions X or the embossed portion of fibre sheet material and the corresponding to state of convex strip portions of buckplate, two buckplates are become the state (state shown in Figure 6) of interlock from the state displacement of mutual separation in the MD direction that makes laminated sheet or fibre sheet material.
Stretching device shown in Figure 7 has a pair of crawler belt 38, is formed with the convex strip portions 36 same with the convex strip portions of Fig. 6 device on it respectively.By direction of arrow introduced layer stacks of sheets or the fibre sheet material from Fig. 7, can on its laminated sheet or fibre sheet material, implement the stretch process of MD direction continuously.
Stretching device shown in Figure 8 is the stretching device of multistage gear type, has the extension section 39 of the gear with convex strip portions to be set to multistage combination.Increase stretching ratio from the extension section in downstream towards the extension section of upstream side.
According to the stretching device of Fig. 6～8, can be that basic point stretches laminated sheet or fibre sheet material on the MD direction with its junction surface or embossed portion.
In addition, the elastic layer of the laminated sheet that is stretched and be essentially whole ground of stiff layer and be bonded together, even and if then the laminated sheet that is bonded together of part, can stretch effectively as long as have the difference of abutment intensity.As the example of whole joint, can list that the joint, the melting heat when utilizing spinning that utilize adhesives such as heat fusing carry out melting adhered joint, interweaving by heat lamination or the hot blast joint that fiber or film is melting adhered, by needle point method or current makes fiber interweaving joint together.As the example that part engages, can list the joint that utilizes above-mentioned heat embossing, ultrasonic wave embossed, adhesive.Can be that basic point is implemented stretch process with the high bonding part of abutment intensity.
In addition, the difference of abutment density is for example utilized whole of heat fusing to engage elastic layer and is essentially between the stiff layer and then when utilizing heat seal etc. partly to engage the junction surface that both form having, be meant at the abutment of heat fusing and the junction point that utilizes heat seal etc. to be produced, when engaging the pattern difference or behind whole joint, carrying out the part joint, the joint pattern difference in both.
In addition, Stretchable sheet of the present invention can also only have the protrusion and the concave part of above-mentioned flexible nonwoven fabrics 10 on a face of sheet material.In addition, can on protrusion 12, be formed with above-mentioned junction surface 4, and on concave part 13, not form above-mentioned junction surface 4.In addition, the draw direction of Stretchable sheet can not be during fabrication with the identical width of operating direction (becoming the conveyance direction of the laminated sheet etc. of raw material), can also be length direction, can also be to become 45 directions of spending etc. respectively with respect to width and length direction in addition.
According to the manufacture method of Stretchable sheet of the present invention, can make the good Stretchable sheet of high scalability, feel and outward appearance efficiently.
According to the drawing process of laminated sheet of the present invention or fibre sheet material, can not destroy junction surface or embossed portion between the fibrage, efficiently stretching part in addition.
Stretchable sheet of the present invention is rich in retractility, bulk and resiliency (thickness recovery after compression on the thickness direction) excellence.
Claims (8)
1. the manufacture method of Stretchable sheet, wherein, to contain elastic layer and be essentially stiff non-elastic fiber layer with elastic extension, and describedly two-layerly carry out part to engage the laminated sheet form be that basic point stretches with described two-layer junction surface each other, thereby obtain Stretchable sheet.
2. the manufacture method of Stretchable sheet wherein, will contain elastic component and be essentially stiff composition, and the fibre sheet material that is formed with the part embossed portion that produces by embossing processing is that basic point stretches with described embossed portion, thereby obtain Stretchable sheet.
3. the manufacture method of Stretchable sheet, it has following stretching process: will contain the elastic layer with elastic extension and be essentially stiff non-elastic fiber layer, and the two-layer part of carrying out engages the belt course stacks of sheets that forms, perhaps contain elastic component and be essentially stiff composition, and the ribbon-like fibre sheet material that is formed with the part embossed portion that produces by embossing processing is inserted between a pair of concavo-convex roller, described a pair of concavo-convex roller is for alternately being formed with a pair of concavo-convex roller of large-diameter portion and minor diameter part on the axial length direction, and the mode that loosely is embedded in according to the large-diameter portion of a concavo-convex roller between the large-diameter portion of another concavo-convex roller is combined; Wherein, in described stretching process, make on the width of described laminated sheet or described fibre sheet material described two-layer each other the junction surface or the position consistency of the large-diameter portion of the position of described embossed portion and concavo-convex roller, described laminated sheet or described fibre sheet material are stretched on its width.
4. the drawing process of laminated sheet wherein, will contain the elastic layer with elastic extension and be essentially stiff non-elastic fiber layer, and two-layerly carry out part to engage the laminated sheet that forms be that basic point stretches with described two-layer junction surface each other.
5. the drawing process of fibre sheet material wherein, will contain elastic component and be essentially stiff composition, and the fibre sheet material that is formed with the part embossed portion that produces by embossing processing is that basic point stretches with the embossed portion.
6. Stretchable sheet, it contains the elastic layer with elastic extension and is essentially stiff non-elastic fiber layer, and the junction surface of two-layer joint is formed on a plurality of positions of draw direction of sheet material, wherein, on at least one face of described Stretchable sheet, form respectively along the protrusion and the concave part that extend with the direction of described draw direction approximate vertical, this protrusion and this concave part alternately form on described draw direction, and are formed with a plurality of respectively; Described junction surface is positioned on the described protrusion at least.
7. Stretchable sheet, it contains elastic component and is essentially stiff composition, and be formed on by the part embossed portion that embossing processing produces on a plurality of positions of draw direction of sheet material, wherein, on at least one face of described Stretchable sheet, form respectively along the protrusion and the concave part that extend with the direction of described draw direction approximate vertical, this protrusion and this concave part alternately form on described draw direction, and are formed with a plurality of respectively; Described embossed portion is positioned on the described protrusion at least.
8. claim 6 or 7 described Stretchable sheets, wherein, on the two sides of described Stretchable sheet, be formed with described protrusion and described concave part, on described draw direction, the position consistency of the position of the protrusion of a face of described Stretchable sheet and the concave part of another face.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP127188/2005 | 2005-04-25 | ||
| JP2005127188 | 2005-04-25 | ||
| JP2005178378 | 2005-06-17 | ||
| JP178378/2005 | 2005-06-17 | ||
| PCT/JP2006/308663 WO2006115259A1 (en) | 2005-04-25 | 2006-04-25 | Stretch sheet and process for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101166858A true CN101166858A (en) | 2008-04-23 |
| CN101166858B CN101166858B (en) | 2012-10-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800140975A Expired - Fee Related CN101166859B (en) | 2005-04-25 | 2006-04-24 | Nonwoven stretch fabric and process for producing the same |
| CN200680014098XA Expired - Fee Related CN101166858B (en) | 2005-04-25 | 2006-04-25 | Stretch sheet and process for producing the same |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006800140975A Expired - Fee Related CN101166859B (en) | 2005-04-25 | 2006-04-24 | Nonwoven stretch fabric and process for producing the same |
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| Country | Link |
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| CN (2) | CN101166859B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN101166858B (en) | 2012-10-31 |
| CN101166859B (en) | 2010-09-29 |
| CN101166859A (en) | 2008-04-23 |
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