WO2011125893A1 - Elastic nonwoven fabric and method for manufacturing same - Google Patents

Elastic nonwoven fabric and method for manufacturing same

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Publication number
WO2011125893A1
WO2011125893A1 PCT/JP2011/058322 JP2011058322W WO2011125893A1 WO 2011125893 A1 WO2011125893 A1 WO 2011125893A1 JP 2011058322 W JP2011058322 W JP 2011058322W WO 2011125893 A1 WO2011125893 A1 WO 2011125893A1
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WO
Grant status
Application
Patent type
Prior art keywords
elastic
direction
nonwoven fabric
fibers
width direction
Prior art date
Application number
PCT/JP2011/058322
Other languages
French (fr)
Japanese (ja)
Inventor
聡 光野
中下 将志
Original Assignee
ユニ・チャーム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date

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Classifications

    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/15577Apparatus or processes for manufacturing
    • A61F13/15585Apparatus or processes for manufacturing of babies' napkins, e.g. diapers
    • A61F13/15593Apparatus or processes for manufacturing of babies' napkins, e.g. diapers having elastic ribbons fixed thereto; Devices for applying the ribbons
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007Form-fitting, self-adjusting disposable diapers
    • A61F13/49009Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/49011Form-fitting, self-adjusting disposable diapers with elastic means the elastic means is located at the waist region
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00Bandages or dressings; Absorbent pads
    • A61F13/15Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/49Absorbent articles specially adapted to be worn around the waist, e.g. diapers
    • A61F13/49007Form-fitting, self-adjusting disposable diapers
    • A61F13/49009Form-fitting, self-adjusting disposable diapers with elastic means
    • A61F13/4902Form-fitting, self-adjusting disposable diapers with elastic means characterised by the elastic material
    • DTEXTILES; PAPER
    • D04BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04HMAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
    • D04H3/00Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length
    • D04H3/08Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating
    • D04H3/14Non-woven fabrics formed wholly or mainly of yarns or like filamentary material of substantial length characterised by the method of strengthening or consolidating with bonds between thermoplastic yarns or filaments produced by welding

Abstract

An elastic nonwoven fabric which can, when in contact with skin, easily form an air flow gap relative to the skin. An elastic nonwoven fabric (20) comprises elastic fibers which extend and contract elastically, and non-elastic fibers which extend non-elastically. The elastic nonwoven fabric (20) has formed thereon rows of flat regions (26) and rows of ridge regions (27) which are raised upward above the upper surface of the flat regions (26) and which have a reversed V-shape. The flat regions (26) and the ridge regions (27) are arranged alternately in the widthwise direction (B) of the elastic nonwoven fabric (20). The ridge regions (27) are formed so as to more easily extend in the widthwise direction (B) than the flat regions (26).

Description

Elastic nonwoven and manufacturing method thereof

This invention relates to the elastically stretchable and contractible elastic fibers and inelastically stretchable non-elastic fibers and elastic nonwoven fabric formed by the method of manufacturing the same.

How to elastically stretchable and contractible elastic fibers and inelastically web formed by the non-elastic fibers to contract after is extended in one direction which extends readily stretchable and contractible with the elastic nonwoven fabric by known is there.

For example, JP-A-2004-244791 (P2004-244791A, Patent Document 1) In been stretchable nonwoven fabric and its production method according to the fibers formed by the fibers is formed of a thermoplastic polyurethane elastomer and a propylene homopolymer There the mixed spunbonded nonwoven partially welded to obtain an elastically stretchable and contractible to nonwoven fabric by applying drawing processing to the nonwoven fabric thereafter. In one method of stretching the nonwoven fabric, arranging a plurality of pairs of nip rolls in the machine direction, in order to quickly towards the rotational speed of the pair of nip rolls from an upstream machine direction downstream. In another method of stretching, supplies nonwoven fabric between a pair of intermeshing rolls. The nonwoven fabric has passed between the pair of rolls, a ridge portion formed on each of the rolls, the nonwoven fabric so as to follow the shape of the groove is bent in a zigzag across the width direction.

Further, JP 2008-248460 JP (P2008-248460A, Patent Document 2) stretchable nonwoven fabric as described in are those which contain a fiber which elastically stretchable and contractible to fibers and non-elastically extensible, they it can be obtained by feeding between a pair of intermeshing rolls that rotate the web in the machine direction including both fibers. In its stretchable nonwoven fabric, a narrow wide band coarse region and the width of the width extending in the longitudinal axis strip dense region is the machine direction are formed on both surfaces of the nonwoven fabric, alternately these two frequency region in the transverse direction of the nonwoven fabric It is arranged. The band-like dense regions stretchable nonwoven fabric forms a groove extending in the longitudinal direction is squeezed. The strip sparse region, to form a flat surface side of the nonwoven fabric is parallel to each other.

JP 2004-244791 JP (P2004-244791A) JP 2008-248460 JP (P2008-248460A)

Elastic nonwoven elastically stretchable and contractible obtained by the prior art, or joining it to another piece of elastic sheet which elastically stretchable and contractible, be extended the elastic nonwoven elastically in an extended state by or bonded to another sheet of inelastic sheet without, a composite sheet of elastically stretchable and contractible, there is the use of the composite sheet as a member of a disposable wearing article such as a disposable diaper. However, in the nonwoven fabric nonwoven fabric is bent in a zigzag across the width direction and by joining it to another piece of the elastic sheet or a non-elastic sheet to try composite sheet, small contact area of ​​the nonwoven fabric and its seat sometimes referred Toka difficult to adopt a bonding method by heat and pressure, an attempt to bonding using a hot melt adhesive coated area of ​​the hot melt adhesive increases vain by the fact that. Further, when the wide band low-density regions on both sides of the nonwoven fabric is formed, also it a is easy to composite sheets bonded to another sheet, wear nonwoven fabric of the composite sheet that in the case of use of the composite sheet so as to contact with the skin of the wearer of the article, ventilation between the skin in contact with the composite sheet in a large area to a wide band low-density regions is skin deteriorate Sometimes.

In the present invention, there is provided a easy elastic nonwoven to make a gap ventilation between the skin upon contact with skin, yet joined the nonwoven against another sheet of different from that body are providing elastic nonwoven fabric is easy to challenge.

This invention for solving the above problems includes a second invention directed to a first invention and the manufacturing method of the elastic nonwoven of the first aspect of the invention to target elastic nonwoven.

The nonwoven fabric first invention to the subject is resiliently elastic fibers extending and contracting, inelastically inelastic fibers and be formed by elastically stretchable and contractible elastically nonwoven fabric extended.

In such elastic nonwoven, where the first invention is characterized it is as follows. That is, the elastic nonwoven fabric has a width direction orthogonal to each other, the length direction and a thickness direction defined by the upper and lower surfaces. Wherein the elastic nonwoven, said upper surface and said lower surface and a plateau of plural rows extending mutually parallel with the length direction, and the longitudinally raised the upper surface to above said upper surface in said plateau and raised areas of the inverted V-shaped plural rows extending is formed. Wherein A plateau with the raised area, have been formed alternately adjacent to each other in the width direction, pulling the elastic nonwoven fabric to the width direction, so that the raised region is to increase the size of the width direction the spread in the width direction, so that the plateau thereafter spread to the width direction so as to increase the size of the width direction, the raised zone being formed so as to be extended to the width direction than the plateaus there.

In one embodiment of the first invention, the non-elastic fibers contained in said raised region is in a state of being stretched at a higher stretch ratio than the non-elastic fiber wherein is included a plateau .

According to still another embodiment of the first invention, the elastic nonwoven fabric, at least one from the raised area appearing in cross section in the width direction of the distal portion of the proximal portion and the raised region moves to the plateau on the other hand, in at least the state of non-elastic fibers are welded to each other of said non-elastic fibers and the elastic fibers.

According to still another embodiment of the first invention, the elastic nonwoven fabric, the heat pressing portion formed so as to intermittently distributed in the said length direction and the width direction, the elastic fibers and the non and the elastic fibers are welded.

In the present invention, the second invention of interest is a process for producing the elastic nonwoven of the first invention.

In such a manufacturing method, the second invention where is characterized are as follows. That has a resilient fibers elastically stretchable and contractible, and a non-elastic non-elastic fibers in the width direction and length direction and the thickness direction perpendicular to each other are formed by extending, with the width direction said first roll and a second roll which said elastic fibers inelastic fibers are rotated to a predetermined direction interdigitated the fiber web which is welded in heat pressing unit for intermittently distributed in the said length direction supplies between. Wherein the peripheral surface of the first roll, the first roll peripheral direction and extend to one direction of the axial direction between the first ridge portion and the first groove adjacent to each other in the other direction each is plural rows formed with a constant first pitch. Wherein the peripheral surface of the second roll, alternating as the second ridge portion of the plural rows meshing with each of said first groove, a second groove of plural rows meshing with each of said first ridges are adjacent to each other be formed in, the second ridge portion of plural rows, the second ridges arranged at one of the second pitch of the first 2 times the pitch and large integral multiple of the pitch than 2 times the pitch parts are included.

In one embodiment of the second invention, at least the second ridge portion of the first ridge and the second ridge portion, the one of the temperature to the temperature and melt to soften the inelastic fibers It is heated to a temperature.

Elastic nonwoven fabric according to the present invention, the plateau, from having a raised area that Egai an inverted V-shape with raised to above the upper surface of the plateau, the elastic nonwoven, it to another sheet when joined at the plateau when joined, not only the bonding it is possible to secure a wide bonding area for another sheet is facilitated, preventing elastic expansion and contraction in the width direction of the raised area there is no. Further, the elastic nonwoven fabric, the case of using it towards the skin, the raised region is when in contact with the skin, between the skin and plateau can make a good gap ventilation.

In the method of manufacturing the elastic nonwoven fabric according to the present invention, the first pitch of the first grooves in one of a pair of rolls which mesh with one another, the second pitch of the second ridge portion at the other of the pair of rolls the first by an integral multiple of more than 2 times the pitch, it is possible to obtain the elastic nonwoven fabric according to the present invention easily.

Partial cutaway perspective view of a disposable diaper in which the elastic nonwoven fabric is used. It shows a II-II line cross section of the Figure 1. Partially cutaway perspective view of a portion of the rear panel. Diagram illustrating the extended state of the rear panel by (a) and (b). Further illustrates the process of manufacturing the elastic nonwoven. Partial cross-sectional view of a roll of mesh. Perspective view of an example elastic nonwoven (photograph). Sectional view of the elastic nonwoven fabric of Figure 7 (photograph). (A), (b), FIG comparing the extended state of the elastic nonwoven by (c) (photograph).

With reference to the accompanying drawings, describing the elastic nonwoven fabric and its production method according to an embodiment of the present invention is as follows.

Figure 1 is a partially broken perspective view of the disposable diaper 1 in which the elastic nonwoven fabric 20 is used. Diaper 1, the diaper wearer and panel 2 prior to coating the ventral (not shown), a panel 3 after coating the back side, the inner surface 2a of the front panel 2 and rear panel 3, the portion in 3a junction and a central panel 4 for covering the crotch portion have been. The front panel 2 and rear panel 3, each of the side edges 2c, 3c how to overlap the butt-seamed, defining a waist opening portion 7 joined at a plurality of joint portions 6 which are intermittently formed . The front panel 2 and rear panel 3 also defines a pair of leg-openings 8 integral with the central panel 4. Furthermore the front panel 2 and rear panel 3, their inner surfaces 2a, an elastic nonwoven fabric 20 to form a 3a, their outer surfaces 2b, and a resilient sheet 21 which forms a 3b, and the elastic nonwoven fabric 20 and the elastic sheet 21 There has been bonded by means of hot melt adhesive 22 is intermittently applied on spots. The Such front panel 2 and rear panel 3, which is elastically extensible in the width direction B of the diaper 1. Central panel 4, but covered with the inner surface sheet 11 and the liquid-impervious outer sheet 12 and the absorber 9 of liquid-permeable for absorbing excrement such as urine of the wearer, simplify the description detailed illustration of the structure to have been omitted. 1 shows a double-headed arrow A and the front-rear direction and the width direction of the diaper 1 and the vertical direction are perpendicular to each other, B, indicated by C.

In Figure 2, Figure 2 shows a cut surface in the width direction B of the rear panel 3 by II-II line cross section of the FIG. 1, FIG. 3 is a partial perspective view of the panel 3 after including the cut surface is there. 2 shows, the wearer's skin 14 of the diaper 1 are indicated by imaginary lines.

In Figure 2, the elastic nonwoven fabric 20 forming the rear panel 3, a plateau 26 of plural rows which are bonded to the elastic sheet 21 with a hot melt adhesive 22 which is intermittently applied, reverse and Egai a V-shape and a raised area 27 of plural rows which projects toward the skin 14 of the wearer from the plateau 26. The plateau 26 and the raised region 27 are arranged alternately to be adjacent to each other in the widthwise direction B. Each plateau 26 have the same dimension in the width direction B, the distance between the centers in the width direction B of the plateau 26 adjacent through a raised area 27 is the pitch P1. Raised region 27 has a distal portion 27a, and a pair of proximal portion 27b, in the proximal portion 27b, the raised region 27 is continuous with the plateau 26. Raised areas 27 of such Figure 2, is formed substantially symmetrically about the distal portion 27a. 2, the double-headed arrow A, also shows the thickness direction of the elastic nonwoven fabric 20 and the elastic sheet 21.

Elastic sheet 21 have been formed in substantially uniform thickness, they are bonded by means of hot melt adhesive 22 to the flat zone 26 in the elastic nonwoven 20. Between such an elastic sheet 21 and the elastic nonwoven fabric 20, the first gap 31 is formed. The first gap 31 is formed so as to repeat in the width direction B of the diaper 1. The first gap 31 is also open at the upper edge 3d and the lower edge 3e of the rear panel 3 extend in the vertical direction C of the diaper 1 (see FIG. 1). However, in the diaper 1, in the site where the rear panel 3 overlaps with the central panel 4, the first gap 31 of such shape of the illustrated example it may not be formed.

Panel 3 after the elastic nonwoven fabric 20 and the elastic sheet 21 in such a state, when the diaper 1 is in the worn state, in the vicinity of the skin 14 of the distal portion 27a and / or the distal portion 27a of the raised region 27 contact with, the second gap 32 is formed between the skin 14 and the elastic nonwoven fabric 20. The second gap 32 is also extend in the vertical direction C of the diaper 1 are not open toward the the upper and lower.

Front panel 2 of the diaper 1, one that is formed by the same manner as the elastic nonwoven 20 and the elastic sheet 21 and the rear panel 3, the first gap 31 between these two sheets 20, 21 are formed, the diaper of when worn, the second gap 32 is formed between the skin 14 and the elastic nonwoven fabric 20 wearer.

In Figure 4 (a), (b) shows the state of the panel 3 after the when the rear panel 3 in FIG. 2 is pulled in the width direction B. In the initial stage of the rear panel 3 is pulled in the width direction B, the plateau 26 is almost no change in its width, the raised area 27 at the same time spread to increase the size of the width direction B, the distal portion 27a height decreases (Figure 4 (a)). When the rear panel 3 is further pulled, overlapping the elastic sheet 21 raised region 27 is flat, further the width of the raised region 27 which is flat and plateau 26 is pulled is changed so as to spread (Fig. 4 (b)). Thus, the raised area 27 is different from the plateau 26, readily extend in the width direction B. Rear panel 3, when released from that it is pulled, resiliently restored to near its original state, namely the state of FIG. When the front panel 2 which is pulled in the width direction B, submitted the same behavior as the rear panel 3 in FIG.

Diaper 1, since such are those formed, when it is in the state of FIG. 2 with respect to panel 2 and rear panel 3 skin 14 before being worn, the elastic nonwoven fabric 20 and the elastic sheet 21 between the can first gap 31 which vertically is in the open state acts as a vent passage extending in the vertical direction C, prevent stuffiness when wearing the diaper 1. The second gap 32 having a large cross-sectional area vertical is in the open state is formed between the skin 14 and the elastic nonwoven fabric 20 wearer also acts as a vent passage extending in the vertical direction C, prevent stuffiness not only it can result in a cooling sensation to the skin 14 of the wearer. In addition, as long as it has a breathable and elastic nonwoven 20 and the elastic sheet 21 in their thickness direction, the air of high humidity inside the diaper 1, first, through a second void 31 not only it is discharged from the upper and lower of the diaper 1, is also discharged from the thickness direction of the front panel 2 and rear panel 3.

Elastic nonwoven 20 that acts in this way is described in detail with reference to later in FIGS. 5-9. The elastic sheet 21, when it becomes joined to the composite sheet and the elastic nonwoven fabric 20, those with elastic nonwoven 20 may be elastically stretchable and contractible, as such elastic sheet 21 include polyurethane the such elastic fibers of the fiber comprises at least 20 wt%, the use of elastically stretchable and contractible nonwoven fabric or woven fabric, be formed of an elastic material such as polyurethane resin elastically stretchable and shrinkable film or the like can.

Figure 5 is a diagram illustrating a manufacturing process of the elastic nonwoven 20. From upstream in the machine direction MD in Fig. 5, the raw material fiber web 101 to obtain the elastic nonwoven fabric 20 is continuously fed. Fiber web 101 has a length direction matching the machine direction MD, and the width direction coincides with the cross direction CD orthogonal to the machine direction MD, and a thickness direction perpendicular to the these lengths and width directions intermittently when supplied to the pair of embossing rolls 102, by the projections for embossing which has been formed on one of the rolls 102 are heated to the required temperature (not shown), in the length direction and the width direction dot-like heat-pressing portion 106 (see FIG. 7) is formed so as to target. Then, the fiber web 101 is fed between the roll 103 and lower roll 104 on which mesh with each other to form a stretching device 105 for the web 101, the elastic fiber web 120 is a continuous body of the elastic nonwoven fabric 20 Become. Elastic fiber web 120 is used by being cut to a required size as an elastic nonwoven fabric 20.

In such a manufacturing process, the fiber web 101, as an example, elastically and the elastic fibers 20 to 80% of elongation and contraction, inelastically such polyolefin fibers polypropylene fibers and polyethylene fibers extending and polyurethane fibers the mixture of non-elastic fiber 80-20 wt% of an equal can be used. Such mixtures may be used, endless long fibers and short fibers are preferably used spunbond nonwoven fabric formed by long fibers.

Embossing roll 102 is heated to a temperature capable of softening or melting at least inelastic fibers of the fibers forming the fiber web 101, the elastic fibers and more preferably forms a fiber web 101 and the inelastic fibers are heated to a temperature of welding. In fiber web 101 is formed with heat and pressure unit 106, when enters the stretching device 105, inelastic stretching of non-elastic fibers extending between the thermocompression bonding part 106 and the heat pressing portion 106, i.e. inelastic fibers it is easy to produce a permanent deformation length.

In the upper roll 103 and lower roll 104. in the stretching device 105, the upper roll 103 has a first groove 132 of the first ridge portion 131 and the plural rows of plural rows are formed so as to go around the roll (FIG. 6 see), these first ridge portion 131 and the first groove 132 are alternately arranged in the axial direction of the cross direction CD, i.e. upper roll 103. The lower roll 104, have a second groove 142 of the second ridge portion 141 and the plural rows of plural rows are formed so as to go around the roll (see FIG. 6), and the second groove part these second ridges 141 142 and cross direction CD, i.e. are arranged alternately in the axial direction of the lower roll 104. By fibrous web 101 is deformed so as to follow in these first ridge portion 131, the first groove 132, second ridge portion 141, the shape of the second groove 142, the elastic fiber web 120 includes a plateau 26 of FIG. 2 It becomes that the raised region 27 is formed.

Figure 6 is a sectional view parallel to the cross direction CD of the upper and lower rolls 103, 104 showing the upper roll 103 and lower roll 104 Togakamiau state in the stretching device 105.

In the upper roll 103, the first ridge portion 131 which contour is Egai a V-shape in the figure are arranged to cross direction CD at a pitch P1. Further, it is first groove 132 contour line between the first ridge portion 131 adjacent to the first ridge portion 131 is Egai an inverted V-shaped formation, cross also in pitch P1 first groove 132 It is arranged in the direction CD.

In the lower roll 104, second ridge portion 141 which contour is Egai an inverted V-shape are arranged in the cross direction CD at a pitch P2. Further, it is the second groove portion 142 having a bottom 142a which extends in the cross direction CD between the second ridge portion 141 adjacent to the second ridge portion 141 is formed, it intersects also with a pitch P2 the second groove 142 It is arranged in the direction CD. Pitch P2 in the illustrated example has twice the dimension of the pitch P1, when the upper roll 103 and lower roll 104 Togakamiau is in the state of FIG. That is, the second ridge portion 141 arranged in the cross direction CD, enters every other respect the first groove 132 arranged at the pitch P1 in the cross direction CD.

6 The fiber web 101 is deformed along the peripheral surface of the rolls 103 and 104 located between the upper roll 103 and lower roll 104 is also shown. Fiber web 101 is fed between the upper roll 103 and lower roll 104, the and the rolls 103 and 104 to transport by rotating the fiber web 101 begins engagement progressively deeper, the fiber web 101, the first ridge part top 131p and part touching to the top 141p of the second ridge portion 141 of the part 131 is their top 131p, it is in substantially fixed state to 141p, located between the top portion adjacent 131p and 141p 101a is stretched in the vertical direction in FIG. The portion 101b never are almost stretched positioned between the matching top 131p and 131p in the second groove 142. When the fiber web 101 is drawn in this way, mainly in the portion 101a of the portion 101a and the portion 101b, while the elastic fibers forming the fiber web 101 is elastically stretchable, inelastic fibers inelastic and extensible, the fiber web 101 i.e. elastic fiber web 120 leaving the drawing device 105, inelastic fibers have changed long ones lengths in portion 101a, the dimension in the cross direction CD of the portion 101a is drawn longer than the dimension in the cross direction CD prior to entering the apparatus 105, the plateaus 26 and the raised region 27 is formed. In the raised region 27, although the elastic fibers are than contracts elastically, but because the shrinkage of the elastic fibers are constrained by the inelastic fibers have changed such that the length becomes longer, the raw material fiber web 101 until the length of time that formed the never shrinks. Comparing the inelastic fibers in the non-elastic fiber and the plateau 26 in the raised region 27, the former fibers are in a state of being inelastically stretched at a higher stretch ratio than the latter fibers. To facilitate the formation of raised areas 27 in such a state, at least a second ridge portion 141 of the second ridge portion 141 of the first ridge portion 131 and the lower roll 104 of the upper roll 103, the fibers it is preferable to heat to a temperature to soften or melt at least a portion of the fibers forming the web 101.

Figure 7 is a photograph showing an example of the elastic nonwoven fabric 20 obtained in the step of FIG. The elastic nonwoven 20 has a mass per unit area intended 90 g / m 2, and a 40 wt% thermoplastic polyurethane fibers and polypropylene fibers 60% by weight. Fiber diameter of the thermoplastic polyurethane fibers of the raw fibrous web 101 in FIG. 5 was used to obtain the elastic nonwoven fabric 20 is 22 .mu.m, fiber diameter of polypropylene fibers was 22 .mu.m. Pitch P1 is 2.5mm in the upper roll 103 in FIG. 2, by using what pitch P2 of 5mm on the lower roll 104, second ridge portion 141 with respect to the first groove portion 132 6mm to Kamikomu depth It was set to. The upper roll 103 and lower roll 104 to set the peripheral speed to 50 m / min, was set the surface temperature to 90 ° C..

The surface of the elastic nonwoven 20 of FIG. 7, a plateau 26 extending straight in one direction and the raised region 27 are alternately arranged in a direction perpendicular to the one direction. The plateau 26 has a number of dot-like heat pressing portion 106 is formed in each direction at a constant pitch. Heat pressing portion 106, although the have also been formed on the raised area 27, the web 101 is drawn at a draw apparatus 105, the bulky ridges zone 27 is obtained by subsequently shrink, its heat pressing portion 106 It has become difficult to see.

Figure 8 is a photograph showing an enlarged portion of the cross section of the elastic nonwoven 20 of FIG. 7 to 15 times, the cross section is perpendicular to the direction in which the raised region 27 extends. Elastic nonwoven 20 is placed on the horizontal plate 41. Plateau 26 in the elastic nonwoven fabric 20 has an upper surface 26d and a lower surface 26e, the lower surface 26e is in contact with the plate 41. Raised region 27 has protrude upward from the upper surface 26d of the plateau 26, the distal portion 27a, and a proximal portion 27b of the elastic nonwoven fabric 20 moves to a plateau 26 from the raised region 27, substantially and Egai an inverted V-shape. Between the raised region 27 and the plate 41, the gap 42 is formed. The distal portion 27a and proximal portion 27b of the raised region 27, a portion which is pressed against the the top 131p being heated at the top 141p and the upper roll 103 are heated under roll 104 in FIG. 5, they in the site is in a state where the elastic nonwoven fabric 20 is compressed in its thickness direction. Also, the raised region 27, between the distal portion 27a and a proximal portion 27b tends to become bulky than other portions of the elastic nonwoven fabric 20.

In FIG. 9 (a), (b), (c) is a photograph showing a state in which is extended by pulling the sheet pieces of elastic nonwoven 20 in one direction. (A) of FIG. 9 is a photograph showing a a plateau 26 in the sheet pieces 51 cut from the elastic nonwoven fabric 20 of Figure 7 and the raised region 27 from above them. In these figures, the center distance G in the width direction B of the heat pressing portion 106 formed on the plateau 26 is indicated by G 0, G 1, G 2. Further, the distance between the centers H of the heat pressing portion 106 located on opposite sides of the raised region 27 is indicated by H 0, H 1, H 2. Center distance H 0, H 1, H 2 extends across a raised region 27.

Sheet piece 51 in FIG. 9 (b) shows a state in which is extended by gripping both ends in the width direction B of the sheet piece 51 (a) in the width direction B of FIG. In the seat piece 51 (b), the changes to the long distances H 1 than the center-to-center distance H is the distance H 0. In the center-to-center distance G, the distance G 0 and the distance G 1 and is about the same, substantially no change. That is, in FIG. 9 (a) and (b) are changed so that only the dimensions of the raised region 27 is increased. The sheet piece 51 has changed so, in FIG. 4, and corresponds to the elastic nonwoven 20 in the raised region 27 is spread in the width direction B while lower its height (a).

(C) in FIG. 9 shows a sheet piece 51 when brought into further extending the sheet pieces 51 in the width direction B of (b). Sheet pieces 51, plateau 26 so that the distance spread of the thermocompression bonding unit 106 as well as extension, is raised region 27 is also extended in between the plateaus 26 and 26. That is, the distance between the centers G is changed to a long distance G 2 than the distance G 1, the distance between the centers H is changed to a long distance H 2 than the distance H 1. Sheet pieces 51 and plateaus 26 and raised region 27 is changed in this way corresponds to the elastic nonwoven fabric 20 in FIG. 4 (b). Sheet piece 51, when released had picking it, contract and elastically returns to a state close to the state (a) of FIG. 9.

(A) in FIG. 9, (b), from the behavior of the sheet piece 51 in (c), it is possible to consider the elastic nonwoven 20 as follows. That is, when extending the elastic nonwoven 20 is a sheet piece 51 in the width direction B, and the initial stage of elongation, elongation easily raised region 27 is deformed to become flat. The next phase of extension, and flat since it is raised region 27 is further extended, many non-elastic fibers was in the plateau 26 and the raised region 27 is under tension in the width direction B. The following additional stage of elongation, the non-elastic fibers in tension is inelastically stretched and eventually rupture.

One embodiment of the present invention, a roll 103 and lower roll 104 on interdigitated which has been used so far, extends a first ridge portion 131 in the axial direction of the first groove 132 Togaue roll 103, a second ridge portion 141 and the second groove 142 is capable of making elastic nonwoven 20 in place of those extending in the axial direction of the lower roll 104. Further, the lower roll 104, a second ridge portion 141 which were lined at a pitch P2 and the second groove 142, it is possible to change what the part so as to be arranged at a pitch P1. Moreover, the second ridge 141 which were lined at a pitch P2 and the second groove 142, it is also possible to change those least part so as to be arranged in an integral multiple of three or more times the pitch P1.

20 elastic nonwoven 20a upper surface 20b lower surface 26 plateau 27 raised region 27a distal portion 27b proximal section 101 the web 103 first roll (upper roll)
104 second roll (lower roll)
106 thermocompression bonding unit 131 first ridge portion 132 first groove 141 second ridge portion 142 second groove P1 first pitch P2 second pitch A front-back direction B transverse direction C vertical direction

Claims (6)

  1. A resiliently elastic fibers extending and contracting, inelastically inelastic fibers and be formed by elastically stretchable and contractible elastically nonwoven fabric extended,
    The elastic nonwoven has a width direction orthogonal to each other, the length direction and a thickness direction defined by the upper and lower surfaces,
    Wherein the elastic nonwoven, said upper surface and said lower surface and a plateau of plural rows extending mutually parallel with the length direction, and the longitudinally raised the upper surface to above said upper surface in said plateau and raised areas of the inverted V-shaped plural rows extending is formed,
    Wherein A plateau with the raised area, have been formed alternately adjacent to each other in the width direction, pulling the elastic nonwoven fabric to the width direction, so that the raised region is to increase the size of the width direction the spread in the width direction, so that the plateau thereafter spread to the width direction so as to increase the size of the width direction, the raised zone being formed so as to be extended to the width direction than the plateaus the elastic nonwoven fabric, characterized in that there.
  2. Wherein said non-elastic fibers contained in the raised zone, according to claim 1, wherein the elastic nonwoven fabric in a state of being stretched at a higher stretch ratio than the non-elastic fiber wherein is included a plateau.
  3. The elastic nonwoven fabric, at least one of the distal portion of the proximal portion and the raised region moves to the plateau from the raised area appearing in cross section in the width direction, of said non-elastic fibers and the elastic fibers at least claim 1 or 2 wherein the elastic nonwoven is in a state of non-elastic fibers have been welded together in.
  4. The elastic nonwoven fabric, the heat pressing portion formed so as to intermittently distributed in the said length direction and the width direction, the elastic fibers and the non-elastic fibers of claims 1 to 3 is welded elastic nonwoven fabric according to any one.
  5. A method of manufacturing a according to claim 1, wherein the elastic nonwoven,
    Has an elastic fiber elastically stretchable and contractible, and a non-elastic non-elastic fibers in the width direction and length direction and the thickness direction perpendicular to each other are formed by extending, the said width direction length between the first roll and the second roll and the said elastic fibers inelastic fibers are rotated to a predetermined direction interdigitated the fiber web which is welded in heat pressing unit for intermittently distributed in the direction to is supplied to,
    Wherein the peripheral surface of the first roll, the first roll peripheral direction and extend to one direction of the axial direction between the first ridge portion and the first groove adjacent to each other in the other direction each is plural rows formed with a constant first pitch,
    Wherein the peripheral surface of the second roll, alternating as the second ridge portion of the plural rows meshing with each of said first groove, a second groove of plural rows meshing with each of said first ridges are adjacent to each other be formed in, the second ridge portion of plural rows, the second ridges arranged at one of the second pitch of the first 2 times the pitch and large integral multiple of the pitch than 2 times the pitch It said method characterized in that parts are included.
  6. Wherein at least the second ridge portion of the first ridge and the second ridge portion, the non-elastic fiber according to claim 5, characterized in that the heated up to one temperature of temperature for the temperature and melt to soften Method.
PCT/JP2011/058322 2010-03-31 2011-03-31 Elastic nonwoven fabric and method for manufacturing same WO2011125893A1 (en)

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WO2016040618A2 (en) 2014-09-10 2016-03-17 The Procter & Gamble Company Nonwoven web
WO2016073713A1 (en) 2014-11-06 2016-05-12 The Procter & Gamble Company Crimped fiber spunbond nonwoven webs / laminates
WO2016073722A1 (en) 2014-11-06 2016-05-12 The Procter & Gamble Company Apertured webs and methods for making the same
WO2017156234A1 (en) 2016-03-09 2017-09-14 The Procter & Gamble Company Absorbent article with activatable material
WO2017156208A1 (en) 2016-03-09 2017-09-14 The Procter & Gamble Company Absorbent articles
WO2018049108A1 (en) 2016-09-09 2018-03-15 The Procter & Gamble Company Systems and methods of applying compositions to webs and webs thereof

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JP5830570B2 (en) * 2014-04-28 2015-12-09 ユニ・チャーム株式会社 Method for producing a composite sheet according to an absorbent article, and the manufacturing apparatus
JP6175529B1 (en) * 2016-03-02 2017-08-02 ユニ・チャーム株式会社 Pants-type disposable diapers

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WO2008066009A1 (en) * 2006-11-28 2008-06-05 Uni-Charm Corporation Composite sheet and absorbent article comprising composite sheet
JP2008248460A (en) * 2007-03-30 2008-10-16 Uni Charm Corp Stretchable nonwoven fabric

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JP2004244791A (en) * 2003-01-24 2004-09-02 Mitsui Chemicals Inc Mixed fiber, and stretch nonwoven fabric comprising the mixed fiber and method for manufacture thereof
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WO2016040618A2 (en) 2014-09-10 2016-03-17 The Procter & Gamble Company Nonwoven web
WO2016073713A1 (en) 2014-11-06 2016-05-12 The Procter & Gamble Company Crimped fiber spunbond nonwoven webs / laminates
WO2016073724A1 (en) 2014-11-06 2016-05-12 The Procter & Gamble Company Crimped fiber spunbond nonwoven webs / laminates
WO2016073722A1 (en) 2014-11-06 2016-05-12 The Procter & Gamble Company Apertured webs and methods for making the same
WO2016073719A1 (en) 2014-11-06 2016-05-12 The Procter & Gamble Company Apertured webs and methods for making the same
WO2016073736A1 (en) 2014-11-06 2016-05-12 The Procter & Gamble Company Apertured webs and methods for making the same
WO2017156234A1 (en) 2016-03-09 2017-09-14 The Procter & Gamble Company Absorbent article with activatable material
WO2017156208A1 (en) 2016-03-09 2017-09-14 The Procter & Gamble Company Absorbent articles
WO2018049108A1 (en) 2016-09-09 2018-03-15 The Procter & Gamble Company Systems and methods of applying compositions to webs and webs thereof

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JP2011214201A (en) 2011-10-27 application

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