WO2016104422A1 - Elastic nonwoven fabric manufacturing method - Google Patents

Elastic nonwoven fabric manufacturing method Download PDF

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Publication number
WO2016104422A1
WO2016104422A1 PCT/JP2015/085667 JP2015085667W WO2016104422A1 WO 2016104422 A1 WO2016104422 A1 WO 2016104422A1 JP 2015085667 W JP2015085667 W JP 2015085667W WO 2016104422 A1 WO2016104422 A1 WO 2016104422A1
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WO
WIPO (PCT)
Prior art keywords
nonwoven fabric
gear
stretchable
direction
pair
Prior art date
Application number
PCT/JP2015/085667
Other languages
French (fr)
Japanese (ja)
Inventor
橋本 達也
哲郎 大窪
奐奐 陳
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.)
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Publication date
Priority to JP2014265424 priority Critical
Priority to JP2014-265424 priority
Application filed by ユニ・チャーム株式会社 filed Critical ユニ・チャーム株式会社
Priority to JP2015-248236 priority
Priority to JP2015248236A priority patent/JP6357462B2/en
Priority claimed from CN201580070959.5A external-priority patent/CN107109734B/en
Publication of WO2016104422A1 publication Critical patent/WO2016104422A1/en

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    • 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
    • D04H1/00Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres
    • D04H1/40Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties
    • D04H1/42Non-woven fabrics formed wholly or mainly of staple fibres or like relatively short fibres from fleeces or layers composed of fibres without existing or potential cohesive properties characterised by the use of certain kinds of fibres insofar as this use has no preponderant influence on the consolidation of the fleece
    • D04H1/4382Stretched reticular film fibres; Composite fibres; Mixed fibres; Ultrafine fibres; Fibres for artificial leather

Abstract

This elastic nonwoven fabric manufacturing method involves: a conveyance step for conveying, in a conveyance direction, a nonwoven fabric that contains elastic fibers which are elastic, and extensible fibers which are less elastic than the elastic fibers; a first processing step in which the nonwoven fabric is extended by being passed through a pair of first gear rollers and in which at least some of the extensible fibers are stretched; a stretching step in which, after the first processing step, the nonwoven fabric is stretched in the conveyance direction; and a second processing step in which, after the stretching step, the nonwoven fabric is stretched by being passed through a pair of second gear rollers that include an area where teeth are formed on the peripheral surface and an area where no teeth are formed, and at least some of the elastic fibers are cut.

Description

The method of producing stretchable nonwoven fabric

The present invention relates to a method for producing a stretchable nonwoven fabric.

Conventionally, nonwoven fabrics, absorbent articles such as disposable diapers and sanitary napkins, cleaning wipers and the like goods, and medical supplies such as masks, are used in a wide range of fields. Thus nonwoven fabric is used in a variety of different fields, when it is actually used in products of various fields are required to be manufactured to the nature and structure suitable for each product application it is.
For example, Patent Document 1 discloses a technique to improve by stretching the nonwoven fabric, stretchable by causing caught a strip of the nonwoven fabric sheet between a pair of teeth grooved roll having a tooth meshing with each other. Further, in the Patent Document 1, by using a tooth roll stretching ratio is different in part upon stretching the nonwoven fabric, techniques stretch properties to produce a partially different nonwoven is disclosed.

Patent No. 479,285 Publication

Possible elastic nonwoven fabric produced by the method described in Patent Document 1 is provided since it has a strong shrinkage, when used in exterior member such as a diaper, or easily bite into the skin of the user, the diaper there is a case in which a problem such as that or the absorber gone to contract occurs. Therefore, by the contraction force provided lower area shrinkage force as well high region, stretchable nonwoven fabric is desired shrinkage force is adjusted moderately.
The present invention was made in view of the above problems, and an object, while having a good stretchability, stretch with a high shrinkage force region and the low shrinkage force region and to provide a gender of the nonwoven fabric.

The main invention for achieving the above object, a stretchable fiber having stretchability, a conveying step of conveying the nonwoven fabric in the conveying direction and a low elongation fiber shrinkage than the stretchable fiber, the nonwoven fabric It is stretched by passing between a pair of first gear roll, a first processing step of extending at least a portion of the extensible fiber, after the first machining step, thereby stretching the nonwoven fabric in the transport direction a stretching step, after said drawing step, said non-woven fabric is stretched by passing between the second gear roll pair and a portion not formed with portions having teeth formed on the peripheral surface, at least and having a second processing step of cutting a portion of the stretchable fiber, and a method for producing a stretchable nonwoven fabric.
Other features of the invention will become apparent from the description in this specification and the accompanying drawings.

According to the present invention, it is possible to provide a good while having stretchability, stretchable nonwoven fabric having a high shrinkage force region and the low shrinkage force region.

It is a schematic perspective view of elastic nonwoven fabric 1. Is a diagram illustrating the configuration of a manufacturing apparatus 100 for manufacturing the elastic nonwoven fabric 1. It is a schematic side view showing the configuration of the first gear teeth portion 120. Is an enlarged view showing the region α in Fig. It is a schematic side view showing the configuration of the second gear teeth portion 140. It is a schematic diagram showing an enlarged about the state of the stretchable fiber 2 in the high shrinkage region HS. It is a schematic diagram showing an enlarged about the state of the stretchable fiber 2 in the low shrinkage regions LS. Is a graph showing the relationship between the stretching ratio and the MD direction of the return stress of the nonwoven fabric. It is a graph showing the relationship between the stretching ratio and the MD / CD ratio of the nonwoven fabric. It is a schematic perspective view of a disposable diaper 5. It is a schematic plan view of a disposable diaper 5 a developed state. It is a diagram for explaining structure of a manufacturing apparatus 200 for manufacturing the elastic nonwoven fabric 1. Is a schematic diagram illustrating the configuration of the gear rolls 245. Is a schematic diagram illustrating the configuration of the gear rolls 246. Is a graph showing the region X in FIG. It is a diagram showing the region Y in FIG. 14. It is a schematic diagram for explaining the relationship between the CD direction of the width of the second gear teeth portion 240. It is a diagram illustrating drawing of the stretchable fiber 2 that is performed in the second processing step.

The description of this specification and the accompanying drawings, at least the following matters will be made clear.
A stretchable fiber having stretchability, a conveying step of conveying the non-woven fabric containing a low elongation fiber shrinkage than the stretchable fiber in the transport direction, passing the nonwoven fabric between a pair of the first gear rolls in is stretched, a first processing step of extending at least a portion of the extensible fiber, after the first machining step, a stretching step of stretching the nonwoven fabric in the transport direction, after said drawing step, the nonwoven fabric, the peripheral surface is stretched by passing between the second gear roll pair and a portion not formed with portions teeth are formed, the cutting at least a portion of the stretchable fiber It has a 2 processing step, a method for producing a stretchable nonwoven fabric, characterized in that.

According to the manufacturing method of the stretchable nonwoven fabric may be the strength of the contractile force in the low shrinkage regions, to produce a weak stretchable nonwoven fabric than the strength of the contractile force in the high shrinkage regions. Thus, it is possible to provide a good while having stretchability, stretchable nonwoven fabric having a high shrinkage force region and the low shrinkage force region.

A method of manufacturing a stretchable nonwoven fabric, in the second gear rolls of said pair, to heat at least one of the gear roll to a temperature lower than the melting point of the extensible fiber, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, stretchable fibers is less likely to be cut in the second process step easily stretched by being heated. On the other hand, if distortion occurs by elastic fibers is heated, likely to be cut or deteriorated. Thus, it is possible to cut efficiently part of stretchable fiber without cutting the extensible fiber, the stretchable nonwoven fabric accurately manufactured with a high shrinkage force region and the low shrinkage force region it becomes possible.

A method of manufacturing a stretchable nonwoven fabric, the teeth of the second gear rolls of the pair are both towards the outside of the circumferential surface is formed so as to project, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, and the crest of the teeth adjacent to each other in one gear roll, by the crest of the other gear roll entering the intervening valley, nonwoven is deformed in three-point bending shape the stretchable fiber can be stretched in the stretching conveying direction. Also, depending on the type of elastic fibers constituting the nonwoven fabric, or change the shallowness of the meshing of gears, it or change the shape and pitch of the teeth, the nonwoven fabric to adjust the tension so that it does not break becomes possible, easily manufacture a high-quality elastic nonwoven fabric.

A method of manufacturing a stretchable nonwoven fabric, in the second gear rolls of the pair, one side tooth gear rolls of is formed to be convex towards the outside of the circumferential surface, first of the pair of the two gear roll, the teeth of gear roller on the other side is formed to be concave toward the outside of the circumferential surface, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, whereas the crest of the teeth that are adjacent to each other in the side of the gear roll by the crest of the gear roll on the other side to enter the valleys between them, in the bending nonwoven three-point is deformed, the elastic fibers can be stretched in the stretching conveying direction. Moreover, since the teeth of the gear rollers on the other side does not protrude from the outer peripheral surface, it is possible to transport by winding the nonwoven fabric into gear rolls of the other side. Thereby, it becomes possible to perform stretching and conveying the nonwoven by gear rolls on the other side, the structure of the apparatus is simplified.

A method of manufacturing a stretchable nonwoven fabric, by the pair of first gear rolls and a pair of drive rolls provided between the conveying direction of the second gear rollers of the pair of said non-woven fabric a predetermined transported in the transport direction at a speed, by the pair the transport direction of the press roll disposed downstream of the drive roll of the nonwoven fabric, the gear roll of the other side of the second gear rolls of the pair by transporting the transport direction at the said non-woven fabric pressed against the outer circumferential surface a predetermined rate faster than, to stretch the nonwoven fabric in the conveying direction, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, by providing only one press roll, since a separate stretching means becomes unnecessary, and more the carrying distance between the first processing step and second processing step it is possible to construct short. Thus, the nonwoven fabric is prevented from being excessively stretched in the conveying direction, the nonwoven fabric is likely to prevent the shrinking in the width direction. Further, immediately after the stretching by using a press roll has been performed, the second processing step using the second gear rolls is performed, so that a portion of the stretchable fiber can be efficiently cut by the second processing step become.

A method of manufacturing a stretchable nonwoven fabric, heating the other hand side gear rolls of the second gear rolls of the pair to a temperature lower than the melting point of the extensible fiber, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, by the non-woven fabric is heated in the second processing step, extensible fiber is less likely to be disconnected easily stretch, stretchable fiber can easily be cut. Also, by heating the nonwoven fabric by the gear roll having teeth be convex toward the outer circumferential surface of the pair of second gear wheels, not too large contact area between the circumferential surface of the gear roll and the nonwoven fabric, the nonwoven it is possible to suppress the entire will be heated. Therefore, problems such as distortion of the stretchable fibers is excessively large is less likely to occur in the second processing step.

A method of manufacturing a stretchable nonwoven fabric, gear roll the other side of the second gear rolls of said pair, conveying the non-woven fabric by rotating in a state of the nonwoven fabric, wound around at least a portion of the peripheral surface conveyed in the direction, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, by rotating by winding a nonwoven fabric in a part of the outer peripheral surface of the gear roll having teeth is concave toward the outside of the outer circumferential surface of the pair of second gear wheels , it is possible to convey the non-woven fabric smoothly. Moreover, since it is possible to firmly sandwich the nonwoven fabric between the press roll, it can be stretched while conveying the non-woven fabric stably.

A method of manufacturing a stretchable nonwoven fabric, the thickness of the tip of the tooth of the gear roll of the other side of the second gear rolls of said pair, of the one side gear rolls of the second gear rolls of the pair greater than the thickness of the tip of the tooth, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, when pressing the press roll on the outer peripheral surface of the gear rolls on the other side having teeth is concave toward the outside of the outer peripheral surface, the tip of the teeth are sharply formed there is no order, it is difficult marked with traces of teeth on the surface of the press roll. Thus, it becomes easy to suppress the conveyance accuracy of the press roll is deteriorated.

A method of manufacturing a stretchable nonwoven fabric, the teeth of the second gear rolls of the pair is continuously formed in the CD direction are respectively a direction orthogonal to the conveying direction, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, all elastic fibers present in the area between the teeth of the two gear rollers provided to be adjacent in the transport direction is likely to be stretched in the conveying direction. Thus, among the plurality of elastic fibers constituting the nonwoven fabric, and the fiber is not drawn fibers being stretched occurs, uniform stretching effect is easily suppressed problems such as not obtained. This makes it possible to produce a bias less stretchable nonwoven fabric stretch in the CD direction.

A method of manufacturing a stretchable nonwoven fabric, the teeth of the second gear rolls of the pair, the CD direction and are arranged along a direction parallel to, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, between the teeth of the two gear rollers adjacent in the conveying direction, since the nonwoven fabric is transported in the transport direction it is easily drawn with a uniform force, strain, etc. nonwoven fabric less likely to occur.

A method of manufacturing a stretchable nonwoven fabric, fibers constituting the stretchable nonwoven fabric is long-fiber, two or more of the long fibers have been crimped together by a plurality of crimping points, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, since the stretchable fiber is a long fiber, at least a portion is easily arranged along the conveying direction, the nonwoven fabric tends to stretch to the conveying direction. Further, since the plurality of long fibers are crimped together by a plurality of crimping points, mutually have a stretchability from each other, the overall nonwoven fabric becomes easy to express the favorable stretchability.

A method of manufacturing a stretchable nonwoven fabric, the second processing step, the pair of second gear roll having a wider pitch teeth than the shortest distance between the conveying direction two of the crimping points adjacent used takes place, it is desirable.

According to the manufacturing method of the stretchable nonwoven fabric, between the pitch of the teeth of the gear rollers, the probability of crimping points for crimping the elastic fibers are contained at least one or more is high. Thus, in the second processing step, since the crimping points included between the pitch of the teeth of the gear rolls is easily disengaged, stretchability becomes weaker in the transport direction of the nonwoven fabric, the low shrinkage regions efficiently in the stretchable nonwoven fabric it can be formed.

=== First Embodiment ===
<Overview of the elastic nonwoven fabric>
First, the outline of the elastic nonwoven fabric 1 as a non-woven fabric having elasticity according to the present embodiment will be described. Elastic nonwoven fabric 1, by performing the drawing processing to be described later with respect to the nonwoven fabric sheet S, is obtained by expressing a stretchability in a given direction. Nonwoven sheet S, the stretchable fiber 2 having stretchability than the stretchable fiber 2 were mixed with low elongation fiber 3 having shrinkability, the stretchable fiber 2 and extensible fiber 3 between each other constant in many bonding points arranged at intervals, a potential stretchable nonwoven fabric are joined by self-bonding due to softening or melting.

Figure 1 is a schematic perspective view of elastic nonwoven fabric 1. Elastic nonwoven fabric 1 is a vertical direction as shown in FIG. 1, and a transverse direction intersecting the longitudinal direction, a long flat strip of sheet members longitudinally. Further, the thickness direction and a direction intersecting the longitudinal direction and the transverse direction of the elastic nonwoven fabric 1, respectively. Stretchable fiber 2 constituting the stretchable nonwoven fabric 1 (nonwoven sheet S) is elastically stretchable thermoplastic elastomer fibers, for example, urethane-based elastomers, polystyrene elastomers, polyolefin elastomers, polyamide elastomers, polyester elastomers, fibers etc. may be used. Specifically, it is possible to use a polyurethane elastomer. Extendable fibers 3 are substantially less likely to shrink in a non-elastic thermoplastic resin fibers while having elongation properties, for example, a composite core-sheath structure consisting of a single fiber, polypropylene or polyethylene, such as polypropylene fibers and polyethylene fibers it can be used, such as fiber. Specifically, there can be used polypropylene which is polyolefin-based resin. These fibers are non-woven sheet S is formed by intertwined at random.

Then, the extensible fiber 3 contained in the nonwoven fabric sheet S or plastically deformed, if destroy bonding points between fibers (junction), the resilient inhibition hard structure deformation of the stretchable fiber 2 can be changed the nonwoven sheet S, thereby, stretch expressed nonwoven sheet S, it made ready for use as a stretchable nonwoven fabric 1. A specific method of expressing stretchable nonwoven sheet S, will be described later.

Elastic nonwoven fabric 1 of this embodiment the longitudinal direction, and has the transverse stretch. Further, the elastic nonwoven fabric 1 has a high shrinkage region HS expressing a strong shrinkage force upon is extended in the longitudinal direction, high shrinkage region HS as compared to low-shrinkage force at the time of elongation was achieved in the vertical direction is weak and contraction and a region LS, has alternately along the longitudinal direction (see FIG. 1). Thus since it is arranged in the high shrinkage region HS and low shrinkage regions LS Togatate direction, when elongation was achieved nonwoven sheet S in the vertical direction, there shrinkage tends portion and the contraction hardly portion It will be. Accordingly, by appropriately changing the range to be the size and formation of the high shrinkage region HS and low shrinkage regions LS, it is possible to adjust the magnitude of the shrinkage force when the elastic nonwoven fabric 1 in the extended state.

<Method for the elastic nonwoven fabric 1>
It explained direction to produce the elastic nonwoven fabric 1 to impart stretchability to the nonwoven fabric sheet S. Figure 2 is a diagram illustrating the configuration of a manufacturing apparatus 100 for manufacturing the elastic nonwoven fabric 1. Manufacturing apparatus 100 of the present exemplary system embodiment includes a transport mechanism CV, a heating unit 110, the first gear teeth portion 120, and the stretched part 130, and the second gear teeth portion 140, and a sheet member bonded portion 150 .

Transport mechanism CV is a transport unit that transports continuously along the nonwoven sheet S to a predetermined transport path. The transport mechanism CV, for example, and the conveying roller, a suction belt conveyor or the like having a suction holding function in serving mounting surface belt surface used. In the transport mechanism CV of this embodiment, the nonwoven sheet S is conveyed as a continuous sheet continuous longitudinally in a predetermined conveying direction. Then, in the process of the nonwoven fabric sheet S is transported in the transport direction (vertical direction), heating processing or drawing processing or the like, by being subjected to various processes to be described later, the elastic nonwoven fabric 1 is manufactured. In the following description, the continuous sheet of nonwoven fabric sheet S conveyed is referred to as a nonwoven continuous sheet Sa.

In the following description refers to set on the manufacturing apparatus 100 of the conveyance direction of the to as "MD direction". The MD direction as shown in FIG. 1, the direction changes depending on the location. That is, the direction in which the nonwoven continuous sheet Sa is conveyed is not necessarily a fixed direction. Also, one of the two directions in the direction orthogonal to the MD direction (perpendicular) referred to as "CD direction", referred to as "Z direction" and the other. CD direction is the width direction parallel to the direction of the nonwoven continuous sheet Sa, in FIG. 2, are oriented to pass through the paper. Further, Z direction is the thickness direction parallel to the direction of the nonwoven continuous sheet Sa.

When manufacturing the nonwoven fabric 1 is first nonwoven continuous sheet Sa from bulk roll wound into a roll, is unwound nonwoven continuous sheet Sa. Fed nonwoven continuous sheet Sa is conveyed from the upstream side of the MD direction at a predetermined conveying speed V1 to the downstream side by the transport mechanism CV, the heating unit 110 reaches the position in which it is located.

Heating unit 110 heats the nonwoven continuous sheet Sa conveyed by the plurality of heating rollers (heating process). As shown in FIG. 2, the heating unit 110 of the present embodiment includes four heating rollers 111-114. Heating rollers 111-114 is a cylindrical transport roller having a smooth outer peripheral surface, a heater is provided on its outer peripheral surface. Nonwoven continuous sheet Sa, while winding in a substantially S-shape on the outer peripheral surface of each heating roller 111-114 in sheet form, is conveyed from the MD direction upstream side of the heating roller 111 to the MD direction downstream side of the heating roller 114. Then, in the process of being conveyed heating section 110, while in contact with the outer peripheral surface of the heating roller 111-114, is heated by a heater provided on the outer peripheral surface.

Heaters provided on the outer peripheral surface of the heating roller 111-114, by adjusting the respective calorific value, it is possible to adjust the heat temperature of nonwoven continuous sheet Sa. Temperature for heating the nonwoven continuous sheet Sa may vary depending fibrous structure of nonwoven continuous sheet Sa, if the thermoplastic polypropylene as described above is used, so that its melting point temperature below based on the melting point of the polypropylene fibers It is adjusted. For example, the temperature of the nonwoven continuous sheet Sa is less than the melting point of polypropylene fiber, and it is preferable to be at least 40 ° C.. The 40 ° C. or less, likely to lower the poor strength stretchable fibers, also becomes more than the polypropylene fiber melting point, or the fibers of the nonwoven continuous sheet Sa is got stuck to the heating roller 111-114, etc., stretching to be described later there is a fear that is cut during processing. In this embodiment, the temperature as the heating temperature by the heating unit 110 is 50 ° C. ~ 60 ° C. is adjusted. The heating step is not an essential step, it is possible to produce the elastic nonwoven fabric 1, even if not heat.

Nonwoven continuous sheet Sa, after being heated by the heating unit 110, the first gear teeth portion 120 is a gear-stretch processing in the first applied (first processing step). Figure 3 is a schematic side view showing the configuration of the first gear teeth portion 120. Further, FIG. 4 is an enlarged view showing the region α in Fig.

The first gear teeth portion 120 includes a guide roller 121, a pair of gear rolls 125 and 126 (first gear rolls) (see FIG. 1). Guide rollers 121, in the MD direction is provided between the gear wheels 125 and 126 of a pair heating unit 110 composed of a plurality of transport rollers which rotate around a rotation axis along the CD direction. Circumferential speed values ​​of the guide rollers 121 V121 is generally is the same value as the conveyance speed value V1 of the nonwoven continuous sheet Sa is conveyed from the upstream process. Thereby, the guide roller 121, without substantially stretching the nonwoven continuous sheet Sa, and can lead to gear wheels 125 and 126 in a tensioned state so as not slackened.

Gear wheels 125 and 126 are upper and lower pair of rolls mechanism for rotating around a rotation axis along the CD direction while facing the outer circumferential surface of each other. The outer peripheral surface of the gear roll 125, with a peak portions 125m and valley portions 125v are alternately formed along the respective direction of rotation, the ridges 125m and Kakutani portion 125v, respectively, extend in the CD direction forming It is. Incidentally, crest 125m and valleys 125v is not required to be formed on the entire CD direction of the gear roll 125, a portion of the area of ​​the CD direction at the outer peripheral surface of the gear roll 125 (e.g., a nonwoven continuous sheet Sa abutting area) only or is formed, it may be for or are intermittently formed in the CD direction. Also, similar to the ridges 126m to the outer peripheral surface of the gear roll 126 and valley portions 126v are alternately formed. When gear rollers 125 and 126 is rotating, so as crests 125m of one gear rolls 125 enters the valley portion 126v of the other gear roll 126 and each other ridges 125m and valley portions 126v engages with a slight clearance going on. Then, during the rotation, between the pair of gear rolls 125 and 126 nonwoven continuous sheet Sa passes along the MD direction.

1 nonwoven continuous sheet Sa in the pass between the pair of gear rolls 125 and 126, crests 126m adjacent to each other in one gear roll 126, and between 126m, crests 125m of the other gear rollers 125 enter between them valleys 126v and by being deformed in a three-point bending shape (see FIG. 4). At this time, crests top surface abutting portion 126m Sa12 of one gear rolls 126 in nonwoven continuous sheet Sa, in order to substantially immovable relative to abut on the top surface, difficult to be stretched. On the other hand, the portion Sa11 between the two Sa12, Sa12 and adjacent, are drawn on the basis of the entry of the crest 125m. As a result, the nonwoven continuous sheet Sa, as shown in FIG. 4, a first portion Sa11 that is stretched, so that the second portion Sa12 unstretched than the first portion Sa11 are alternately arranged in the MD direction It is processed. Then, in the region of the first portion Sa11, extensible fiber 3 forming the nonwoven continuous sheet Sa is partially stretched. In other words, by passing between the pair of gear rolls 125 and 126, the nonwoven continuous sheet Sa, a state where at least a portion of the extensible fiber 3 is extended. Thus extendable fibers 3, a state that can not inhibit the elastic deformation of the stretchable fiber 2, the nonwoven continuous sheet Sa expresses elasticity on the basis of elastic deformation of the stretchable fiber 2.

Incidentally, in the gear roll 125, (pitch Pv at the position corresponding to the top surface of the valley 125v) rotation direction of the formation pitch Pv of the valley 125v is Yamabe rotational direction of the formation pitch Pm of 125m (crest 125m top of is the pitch Pm) and the equivalent of a plane. The pitch Pv, the Pm with gear wheels 125 and 126 are equivalent, respectively. Formation pitch Pm in the rotational direction of such ridges 125m (126m), it is desirable for example in the range of 1.0 mm ~ 5.0 mm. In the present embodiment, and Pm = 2.72 mm. The height of each tooth (height from the top surface of the mountain portion 125m to the top surface of the valley 125v) is preferably at least pitch Pm, which in this embodiment is 5.0 mm. Further, the meshing height of the crest 125m and mountain portion 126m is 4.0 mm.

In the present embodiment, in the above heating step, the heated nonwoven continuous sheet Sa in advance, since the increasing temperature, extensible fiber 3 becomes easily state deformed, are easily stretched. This can prevent breakage of the nonwoven continuous sheet Sa in the first processing step. Incidentally, the draw ratio in the first processing step may be changed depending on other conditions.

After being expressed stretchability by the first processing step, the nonwoven continuous sheet Sa is conveyed to the MD direction downstream side, it is stretched in the MD direction (longitudinal direction) by stretching section 130 (stretching step). Stretching unit 130 includes an upstream side nip rolls 131, and a downstream nip roll 132 (see FIG. 2). Upstream nip rolls 131 is adjustable up and down a pair of rollers a peripheral speed value, while sandwiching the nonwoven continuous sheet Sa in the outer peripheral surface of each other, by rotationally driven at a predetermined peripheral speed values ​​V131, consecutive identical nonwoven It conveyed to the downstream side in the MD direction of the sheet Sa at the conveying speed of the V131. Downstream nip rolls 132 is upstream nip rolls 131 and similar upper and lower pair of rollers, by rotationally driven at a predetermined peripheral speed values ​​V132, the nonwoven continuous sheet Sa at a conveying speed of V132 in the MD direction to the downstream side to transport.

In the present embodiment, than the conveying speed V131 of the nonwoven continuous sheet Sa by the upstream nip rolls 131, the peripheral speed values ​​for each nip roll as towards the conveying speed V132 of the nonwoven continuous sheet Sa is advanced by the downstream nip rolls 132 is adjusted ing. Thus, the nonwoven continuous sheet Sa after passing through the stretching section 130 is stretched in the MD direction at a predetermined magnification. The draw ratio is determined according to the elastic limit of the stretchable fiber 2 constituting the nonwoven continuous sheet Sa. Specifically, stretchable fiber 2 draw ratio is determined to be an extended state to an extent that does not cause plastic deformation. For example, when using polyurethane as the stretchable fiber 2 in this embodiment, until the MD direction length in unloaded state of the nonwoven continuous sheet Sa is taken as 1.0, the length of about 2.5 times MD It is stretched in the direction. Thus, stretchable fiber 2 is in the state of fully extended so as not to break.

After being oriented by stretching process, the nonwoven continuous sheet Sa is conveyed to the MD direction downstream side, the second gear teeth portion 140, gear-stretch processing for the second time is performed (second processing step). Figure 5 is a schematic side view showing the configuration of the second gear teeth portion 140. The second gear teeth portion 140 includes a pair of gear rolls 145 and 146 (the second gear rolls). Gear wheels 145 and 146 of the pair is substantially the same as the gear wheels 125 and 126 of the first gear teeth portion 120, with a pair of upper and lower rolls mechanism for rotating around a rotation axis along the CD direction while facing the outer circumferential surface of each other is there. However, gear wheels 145 and 146 of the second gear teeth 140, in that it has a portion which is not formed with portions which teeth are formed on an outer peripheral surface, different from the gear roll 125 and 126 of the first gear teeth portion 120 .

As shown in FIG. 5, the outer peripheral surface of the gear roll 145, and the tooth surface 145ts a region where teeth are formed, and a smooth surface 145fs is a region which is not the teeth are formed are alternately arranged. Then, the tooth surface 145Ts, and mountain portions 145m and valley portions 145v in the rotational direction are alternately formed. Similarly, the outer peripheral surface of the gear roll 146, and the tooth surface 146ts a region where teeth are formed, and a smooth surface 146fs is a region which is not the teeth are formed are formed alternately. Then, the tooth surface 146Ts, and mountain portions 146m and valley portions 146v in the rotational direction are alternately formed.

In second gear teeth portion 140, the tooth surface 146ts flanks 145ts and gear roller 146 of the gear rolls 145 are disposed opposite to each other. Thus, gear wheels 145 and 146 so that the mutual teeth meshing when rotating. Further, the smooth surface of the smooth surface 145fs and gear roller 146 gear rolls 145 146Fs are also arranged in mutually opposite positions. Then, between the gear wheels 145 and 146 of such a pair nonwoven continuous sheet Sa passes along the MD direction.

If the nonwoven continuous sheet Sa passes between smooth surface 145Fs, and 146Fs, since the corresponding area is not formed teeth, nonwoven continuous sheet Sa passes the intact MD direction downstream side without being stretched. That is, the area passing between the smooth surface 145Fs, and 146fs of nonwoven continuous sheet Sa is an area which is not drawn by the second gear teeth portion 140. This region, a high shrinkage region HS in FIG.

On the other hand, if the nonwoven continuous sheet Sa passes between tooth surfaces 145Ts, and 146Ts,
Nonwoven continuous sheet Sa is crests 146m adjacent to each other in one gear roll 146, and between 146m, by the ridges 145m of the other gear rollers 145 enter between them valleys 146V, in the same manner as described in FIG. 4 three It is transformed to the point bending shape. As a result, stretchable fiber 2 which has been stretched to near the elastic limit in the stretching step, is stretched further until to 4.0 times the length of the no-load state of the nonwoven continuous sheet Sa. Thus, at least a portion of the stretchable fiber 2 is cut, the low shrinkage regions LS in FIG. 1 is formed. In the low shrinkage regions LS, since a part of the stretchable fiber 2 is cut, shrinkage force is less likely to occur due to elastic fibers 2, contractile force of the MD direction in comparison with the high shrinkage region HS is weakened .

In the second gear teeth portion 140, engagement height between crest 125m and mountain portion 126m is 1.5 mm, height meshing in gear rolls 125 and 126 of the pair of first gear teeth portion 120 (4. It is shallow engagement as compared to 0mm). Thus, while the stretchable fiber 2 is broken, so that the nonwoven continuous sheet Sa itself is not broken, and adjust the tension. The height and shape of the crest 125m (126m), the pitch is changed according to the type of fibers constituting the nonwoven continuous sheet Sa. Further, the tooth surface in Figure 5, although the outer peripheral surface of the gear roll 145 (146) and the tooth surface 145ts (146ts) and the smooth surface 145fs (146fs) is formed by two alternately formed on the outer peripheral surface the number and arrangement of and smooth surface can also be suitably changed.

Nonwoven continuous sheet Sa some stretchable fiber 2 is cut by the second gear teeth portion 140, the sheet member bonding portion 150 in the MD direction downstream side, is joined are glued to the other sheet member Sb and thickness direction that (bonding process). Sheet member bonding portion 150 includes an adhesive coating section 151, a pair of upper and lower laminating roll 152. Adhesive applying unit 151 applying an adhesive such as a hot-melt adhesive to the surface of the nonwoven continuous sheet Sa is conveyed. Laminating roll 152, by rotationally driven at a predetermined peripheral speed values ​​V152, the nonwoven continuous sheet Sa at a conveying speed of the V152 while conveyed downstream in the MD direction, the other sheet member Sb supplied separately, nonwoven adhesive continuous sheet Sa is joined by bonding to the surface of the coated side.

In the sheet member bonding portion 150, the peripheral speed value V152 of laminating roll 152 is a peripheral speed value V132 equivalent to the downstream side nip rolls 132 draw processing unit 130. That is, the nonwoven continuous sheet Sa after being stretched in the stretching step is conveyed to the MD direction downstream side at a constant speed. This makes it possible to in laminating roll 152 tends timed when laminating the other sheet member Sb with respect to the nonwoven continuous sheet Sa. The present bonding process is not an essential step, bonding of the nonwoven continuous sheet Sa and the other sheet member Sb may not be performed.

In the present embodiment, by sequentially executing each process described above using the manufacturing apparatus 100, the elastic nonwoven fabric 1 is manufactured.

<Shrinkage properties of the stretchable nonwoven fabric 1>
In conventional stretchable nonwoven fabric, only the high shrinkage region HS had been formed by the gear-stretch processing corresponding to the first processing step described above. In contrast, in the elastic nonwoven fabric 1 of the present embodiment, by having a weak low shrinkage regions LS shrinkage force than high shrinkage region HS, strong portion and a weak shrinkage force is formed. In comparison with conventional elastic nonwoven fabric, it is also possible to weaken the overall shrinkage force. Therefore, when used in products such as absorbent articles (e.g., later-described disposable diaper), it becomes possible to give an appropriate contractile force where required. It will be specifically described below shrinkage characteristics of the stretchable nonwoven fabric 1.

First, in the elastic nonwoven fabric 1 for difference in the structure of the high shrinkage region HS and low shrinkage regions LS will be described. In stretchable nonwoven fabric 1, when the stretchable fiber 2 is stretched, the stretchable fiber 2 by the contraction force at the time of returning to the original state, stretchability is expressed. In the present embodiment, the state of the stretchable fiber 2 is different between the high shrinkage region HS and low shrinkage regions LS. Figure 6 is a schematic diagram showing an enlarged about the state of the stretchable fiber 2 in the high shrinkage region HS. Figure 7 is a schematic diagram showing an enlarged about the state of the stretchable fiber 2 in the low shrinkage regions LS. Incidentally, extendable fibers 1 of the fibers constituting the elastic nonwoven fabric 1 is in a state of expanded by being stretched in the first processing step described above. Then, since the extension fiber 1 itself is hardly shrink, stretch fiber 1 extended state is not likely affect the shrinkage of stretchable fiber 2. Therefore, to simplify the description, FIG. 6 and 7, are hidden for the extensible fiber 1.

In high shrinkage region HS, by stretchable fiber 2 between the state of not being cut is pressed together at a plurality of points, has a net-like structure as shown in FIG. For example, a three places of the crimping point WP along the longitudinal direction (MD direction) and the stretchable fiber 2a and 2b in FIG. 6, are joined together in the crimping point. Note that the crimping point WP are those formed by embossing or the like to the nonwoven continuous sheet Sa.

If stretchable fiber 2a and 2b is extended in the vertical direction in FIG. 6, by the mutual force of contraction interact while maintaining the network structure, when the stretchable fiber 2a and 2b perform alone contraction, respectively compared to a stronger contraction force is generated with. By this network structure is formed over the entire area of ​​the high shrinkage region HS, large shrinkage force in the vertical direction in high shrinkage region HS is generated. Further, by the network structure, stretchable fiber 2 of high shrinkage region HS is since the contractile force for the horizontal direction is generated, the elastic nonwoven fabric 1 also becomes stretchable in the transverse direction. Thus, use elastic nonwoven fabric 1 is widened.

On the other hand, the low shrinkage regions LS shown in FIG. 7, a part of the stretchable fiber 2 is cut by the second processing step described above, the number of expressible stretchable fiber 2 contractile force is less there. Therefore, contraction force generated as a whole low shrinkage regions LS is relatively weak. Further, if the stretchable fiber 2 is cut at a plurality of positions in the vertical direction, because the shrinkage force is hardly transmitted in the longitudinal direction, contraction force generated by the low shrinkage regions LS tends weaker. That is, in the low shrinkage regions LS, stretchable fiber 2 is cut ends CE formed by being cut there are a plurality. Then, as the cutting edge CE included in the low shrinkage regions LS is large, shrinkage force in the low profile area LS is weakened.

In the elastic nonwoven fabric 1 of the present embodiment, while the easy cut ends CE is formed in the low shrinkage regions LS, high shrinkage region HS in the cutting edge CE is hardly formed. That is, the ratio of the cutting edge CE present per unit volume of the low shrinkage regions LS is higher than the percentage of the cut end portion CE present per unit volume of high shrinkage region HS. Thus, contraction force generated by the low shrinkage regions LS is weaker than contractile force generated high shrinkage region HS.

Incidentally, since the elastic nonwoven fabric 1 includes an extensible fiber 1 and stretchable fibers 2, when measuring the number of elastic fibers 2 of the cutting edge CE is stretchable fiber 2 only staining after the state easy to noticeable cut edge CE, it may perform observation using a microscope or the like. As the dye for dyeing stretchable fiber 2, for example, it can be used Wig Shop fine goods made calls die ol. The dye, while for dyeing polyurethane (elastic fibers 2) have a small extent that is dyed polypropylene (extensible fiber 1). Such dyes by dyeing only stretchable fiber 2 with, can be measured efficiently as needed the number of cut ends CE of stretchable fiber 2.

Further, the low shrinkage regions LS, disconnected stretchable fiber 2 crimping point between WP, as shown in FIG. 7, and has a stretchable fiber 2 that has not been cut is arranged along the longitudinal direction structure . That is, stretchable fiber 2 is in the vertical orientation (MD orientation). For example, it arranged substantially linearly respectively along the longitudinal direction (MD direction) and the stretchable fiber 2c and 2d in FIG. In this case, elastic fibers 2c, 2d, it is not possible to maintain a net-like structure as shown in FIG. 6, shrinkage force is never interact with each other among a plurality of fibers. Therefore, stretchable fiber 2 is compared with the high shrinkage region HS that maintain network structure, contraction force generated by the low shrinkage regions LS tends relatively weak.

That is, in the stretchable nonwoven fabric 1 of the present embodiment, the percentage of crimp point WP present per unit volume of the low shrinkage regions LS is lower than the percentage of crimp point WP present per unit volume of high shrinkage region HS ing. Thus, contraction force generated by the low shrinkage regions LS is weaker than contractile force generated high shrinkage region HS.

Next, a description about the size of the contractile force actually generated in the high shrinkage region HS and low shrinkage regions LS. The size of "shrink force" can be represented by a "return stress". The "return stress", when elongation was achieved target serving sheet member to be measured under a predetermined condition, a value obtained by measuring the amount of force to return to the original state (i.e., shrink force).

Measurements of the "return stress" in the present embodiment, the low-speed elongation type tensile tester (e.g., SHIMADZU made Autograph AG-1, hereinafter simply referred to as "tester") was used. First, MD direction of the elastic nonwoven fabric 1 for each CD direction, collecting length 70 mm, the sample pieces of 50mm wide by a predetermined number. The tester is provided with a chuck portion of the pair having a predetermined gap (not shown), while holding the sample piece in a chuck portion of the pair, pulling the sample piece in a direction to widen the spacing of the chuck portion it is can be extended the sample piece.

First, sample pieces taken from the elastic nonwoven fabric 1, the interval in the longitudinal direction is grasped by the chuck portion of the tester so that the 50 mm. In this state, until the distance between the chuck portion is 100 mm, pulling the sample piece at a tensile speed of 100 mm / min. In other words, to extend the sample piece to a length of two times. Then, the distance between the chuck portion is returned to the sample pieces so that 50 mm, pulling up 100mm again. Then, back to the interval of the chuck portion is in a state of 87.5 mm. That is, after repeated pulling operation twice, fixed in a state where the sample piece is a length of 1.75 times the original length. In this case the sample piece is recorded as the stress back by measuring the force to return to the original (unit is expressed in N / 50 mm). Incidentally, when the size of harvestable sample piece is less than 70 mm × 50mm performs measurement using a sample piece of a size smaller than, that the width of the sample piece is converted to correspond to 50mm return stress is calculated.

Thus measured return stress indicates that higher shrinkage force value is greater is strong. In this embodiment, the elastic nonwoven fabric 1 MD direction (longitudinal direction) was measured for the CD direction (lateral direction) for each return samples were taken every 3 pieces stress, the MD direction in the high shrinkage region HS the average value of the return stress 0.794 (N / 50mm), the mean value of the CD direction of the return stress was 0.172 (N / 50mm). The average value in the MD direction of the return stress in the low shrinkage regions LS is 0.437 (N / 50mm), the mean value of the CD direction of the return stress was 0.071 (N / 50mm). From this result, towards the back stress at high shrinkage region HS is, it was found that greater than return stress in low shrinkage area LS. That is, in the stretchable nonwoven fabric 1 in the MD direction (longitudinal direction), it can be seen that is smaller than elastic force towards the stretching force generated by the low shrinkage regions LS occurs in high shrinkage region HS. Thus, by using the manufacturing apparatus 100 of the present embodiment, while having a good stretchability, it is possible to produce the elastic nonwoven fabric 1 having a high shrinkage force region and the low shrinkage force region.

Figure 8 is a graph showing the relationship between the stretching ratio and the MD direction of the return stress of the nonwoven fabric. The horizontal axis of FIG. 8 represents the draw ratio of the stretchable nonwoven fabric 1 in the MD direction when stretched by gear-stretch processing and the like, and the vertical axis represents the actual measured MD direction of return stress. A point in FIG. 8, state the elastic nonwoven fabric 1 is not drawn (the state when a draw ratio of 1.0), i.e., stretching the nonwoven continuous sheet Sa before being subjected (the state of original fabric roll) it represents the magnitude of the return stress about. In this case, MD direction of return stress is about 1 (N / 50mm). Also, B point in FIG. 8, state elastic nonwoven fabric 1 is stretched to about 3.3 times, i.e., the return stress of the high shrinkage region HS formed by being stretched by the first gear teeth portion 120 it represents the size. Also, C point in FIG. 8 is formed, a state where the elastic nonwoven fabric 1 is stretched to about 4.0 times, i.e., is oriented by stretching section 130, and, by being stretched by the second gear teeth portion 140 it represents the magnitude of the return stress of the low shrinkage regions LS that is.

In the present embodiment, for some areas of the nonwoven fabric stretched by the stretching section 130 (low shrinkage regions LS), by further performing the gear-stretch processing by the second gear teeth portion 140, the elastic limit in the non-woven fabric because the number of elastic fibers 2 to be cut by more than an increase, it is possible to reduce the contractile force in the region. As a result, the stress return value with the increase of stretching ratio as shown in FIG. 8 also drops, the return stress value it is possible to lower to 0.6 (N / 50mm) or less. Incidentally, the stretching ratio 3.7 times when the return stress is 0.6 (N / 50mm) is possible values ​​realized by providing a gear-stretch processing by the second gear teeth portion 140.

Next, the size of the return stress in the MD direction with respect to the return stress in the CD direction (lateral direction) (longitudinal direction) (hereinafter, also referred to as MD / CD ratio) be examined. MD / CD ratio represents that the larger the value of a strong influence of the MD direction of the contractile force. That is, the fiber orientation of the stretchable fiber 2 as MD / CD ratio is large indicates that the prone to MD direction closer.

Figure 9 is a graph showing the relationship between the stretching ratio and the MD / CD ratio of the nonwoven fabric. The horizontal axis in FIG. 9 represents the draw ratio of the stretchable nonwoven fabric 1, the vertical axis represents the actual measured MD direction of return stress. Also, as in the case of FIG. 8 described above, A point in FIG. 9 represents the magnitude of the return stress of the nonwoven continuous sheet Sa before the stretching is performed (Hara roll state). Point B of Figure 9 represents the magnitude of the return stress of the high shrinkage region HS, C point represents the magnitude of the return stress of the low profile area LS.

In stretching the nonwoven continuous sheet Sa before being subjected (A point in FIG. 9), while the MD / CD ratio is approximately 3.0, the high shrinkage region HS (B point in FIG. 9), MD / CD ratio is 4.62, the low shrinkage regions LS (C point in FIG. 9), MD / CD ratio has become 6.15. MD / CD ratio is increased with the increase of stretching ratio in contrary to the case of FIG. 8, MD / CD ratio in the low shrinkage regions LS is greater than the MD / CD ratio in the high shrinkage region HS. This can be achieved by applying to a portion of the area of ​​the nonwoven fabric stretched by the stretching section 130 (low shrinkage regions LS), a further gear-stretch processing by the second gear teeth portion 140, fibers in the low shrinkage regions LS since the crimping point deviates, fiber orientation of the stretchable fiber 2 is considered to be because prone to MD direction closer. As a result, MD / CD ratio in the shrink region LS indicates 5.3 or more high value. Incidentally, the stretching ratio 3.7 times when MD / CD ratio is 5.3, a possible value realized by providing the gear-stretch processing by the second gear teeth portion 140.

Further, the range of the distortion that occurs when the stretchable fiber 2 is contracted in the low shrinkage regions LS of the stretchable nonwoven fabric 1 is stretchable fibers 2 is greater than the range of the distortion that occurs when the contraction in the high shrinkage region HS. For example, in the above-mentioned return stress measurement, when measuring the strain generated in the MD direction for the sample piece which is released after the measurement of return stress, the strain 7-8 percent occur in the sample piece taken from high shrinkage region HS against, resulting distortion of 15-20% in sample piece taken from the low shrinkage regions LS. This network structure of the low shrinkage regions LS in stretchable fiber 2 is not maintained, since the fiber orientation of the stretchable fiber 2 is in the MD direction closer (see FIG. 7), the longitudinal direction of the stretchable fiber 2 influence of the distortion is considered to become easy to appear directly MD direction when distortion occurs. That the strain in the MD direction of the stretchable fiber 2 is large, the stretchable fiber 2 indicates that hardly shrink in the MD direction, from this, the low shrinkage regions LS rather than high shrinkage region HS it can be seen that the contraction force is weakened.

<Example of use of the elastic nonwoven fabric 1>
As an example of a specific use of the elastic nonwoven fabric 1, an example of using the elastic nonwoven fabric 1 as an exterior material of a disposable diaper. Figure 10 is a schematic perspective view of a disposable diaper 5. Figure 11 is a schematic plan view of a disposable diaper 5 a developed state.

Disposable diapers 5 (hereinafter, simply referred to as "diaper 5") includes an absorbent body 51 for absorbing excrement such as urine is Ategawa the crotch portion of the wearer (first component), the ventral part of the wearer the a ventral band member 52 (second part) covering a back-side band member 53 which covers the back side of the wearer (third component), a three disposable diaper constructed so-called 3-piece by the part of. In the expanded state of FIG. 11, is fixed in a state where the absorbent body 51 is stretched between the abdominal-side band member 52 is disposed substantially parallel to the back-side band member 53, its external shape is plan view H It has a shape. When wearing the diaper 5 is folio absorbent body 51 in the middle portion in the longitudinal direction, and the abdominal-side band member 52 and the back-side band member 53 facing each other are bonded to each other in the width direction short edges 52e and 53e by, a waist-opening 5HB and diaper 5 of the pair of leg wearer that an open 5HL is formed as shown in FIG. 10.

In the diaper 5, there is a case where the ball-side band member 52 and the back-side band member 53 so as to be stretchable in the width direction of the diaper 5, stretchable nonwoven fabric is used as the material of the abdominal-side band member 52 and the back-side band member 53. Thus, stretchable waist opening 5HB (contractility) is applied, it is possible to provide an appropriate fit in girth (waist) of the wearer during wearing of diaper 5.

Incidentally, FIG. 11 and, as shown in FIG. 10, in the ventral part of the diaper 5, the ventral band member 52 is contracted inward in the width direction, the absorbent body 51 which is joined to the ventral band member 52 the width contracts in the inward direction. When the absorbent body 51 contracts, the area of ​​a region where only the reduced volume to cover the wearer's skin is reduced. In particular, if the area of ​​the portion for absorbing urine in the ventral side of the absorbent body 51 is reduced, there is a possibility that urine leakage or problems. Accordingly, the ventral band member 52, it is necessary to suppress that by adjusting the strength of the contraction force the absorbent body 51 shrinks inward in the widthwise direction.

Therefore, the elastic nonwoven fabric 1 of the present embodiment is used as the ventral band member 52 of the diaper 5. Specifically, the longitudinal direction of the elastic nonwoven fabric 1 is arranged a stretchable nonwoven fabric 1 so as to be aligned with the width direction of the diaper 5 in the ventral side of the diaper 5. The elastic nonwoven fabric 1 as described above, while having elasticity, by having a high shrinkage region HS and low shrinkage regions LS, it is possible to weaken the overall shrinkage force. In particular, by arranging using the elastic nonwoven fabric 1 as the abdominal-side band member 52 as a low shrinkage region LS and the absorbent body 51 overlaps the absorbent body 51 effectively the that shrinks inwardly in the width direction it can be suppressed. Further, in the elastic nonwoven fabric 1, by changing the range of the high shrinkage region HS and low shrinkage regions LS is formed, it is possible to adjust the contractile strength. Thus, while suppressing shrinkage of the absorbent body 51, by giving an appropriate elasticity to the waist-hole 5HB diaper 5, it is possible to provide a comfortable fit on the wearer. As for the other parts, if arranged low shrinkage regions LS in a region that does not want shortened, while having elasticity as a whole, the area not desired shortening can configure the product so as not to shrink.

=== Second Embodiment ===
Then, by using the manufacturing apparatus 200 of the second embodiment, the direction of manufacturing the elastic nonwoven fabric 1 will be described. Figure 12 is a diagram for explaining structure of a manufacturing apparatus 200 for manufacturing the elastic nonwoven fabric 1. Manufacturing apparatus 200 includes a transport mechanism CV, a heating unit 210, the first gear teeth portion 220, and the second gear teeth portion 240, and a sheet member bonded portion 250.

In the manufacturing apparatus 200, the configuration of the second gear teeth portion 240 is different as compared to the manufacturing apparatus 100 of the first embodiment. The stretching processing section 130 is not provided to the manufacturing apparatus 200. The other basic configuration and function of is substantially the same as the manufacturing apparatus 100, the description thereof is omitted here. The following describes a second gear teeth 240.

The second gear teeth 240 of the manufacturing apparatus 200 is a mechanism that performs the corresponding processing to the stretching step and the second processing step in the first embodiment. The second gear teeth portion 240 includes a driving roll 241, a press roll 242, a pair of gear rolls 245 and 246 (second gear rolls).

Drive roll 241 is adjustable up and down a pair of rollers a peripheral speed value, while sandwiching the nonwoven continuous sheet Sa in the outer peripheral surface of each other, by rotationally driven at a predetermined peripheral speed values ​​V241, the nonwoven continuous sheet the Sa at the conveying speed of the V241 is conveyed downstream in the MD direction. The size of the transport speed V241 is the transport speed V221 more nonwoven continuous sheet Sa by the first gear teeth portion 220, for example, is desirable 115% size of about V221. To be greater than the conveying speed V221 the transport speed V241, nonwoven continuous sheet Sa is slightly elongated in the MD direction between the first gear teeth portion 220 and the drive roll 241. Since the nonwoven continuous sheet Sa is expressed stretchability in the MD direction in the first processing step in the first gear teeth portion 220, which may accordance but occur during transport. In contrast, by applying a tension in the MD direction to adjust to the nonwoven continuous sheet Sa the conveying speed by the drive roll 241, the nonwoven continuous sheet Sa is conveyed in a state stretched in the MD direction, the nonwoven fabric continuous sheet Sa can According to during transport but to suppress the occurrence. However, the size of the conveying speed V241 is not as long as the above may be the same size and V221, may be greater than 115% of V221.

The relationship of such transport speed also applies to the first embodiment. That is, the conveying speed V131 on the upstream side nip rolls 131 of the first embodiment, it may be conveying speed V121 least in the first gear teeth portion 120. By to convey while applying tension in the MD direction to the nonwoven continuous sheet Sa, easily suppress the occurrence of accordance when conveying the nonwoven continuous sheet Sa which stretchability is expressed.

Press roll 242, than the drive roll 241 is provided on the downstream side in the MD direction, rotates while pressing the nonwoven continuous sheet Sa to the outer peripheral surface of the later-described gear rolls 246. Gear rolls 246 is rotated at a predetermined peripheral speed values ​​V242, nonwoven continuous sheet Sa is conveyed at the conveying speed of the V242 in a state of being sandwiched between the press roll 242 to the downstream side in the MD direction. Transportation speed at the press roll 242 V242 is faster than the conveying speed V241 of the driving roll 241, in the present embodiment is adjusted to a speed of approximately 255% of the conveying speed V221 of the first gear teeth portion 220. Therefore, nonwoven continuous sheet Sa on the basis of the peripheral speed difference between the conveying speed V242 by the transfer speed V241 and the press roll 242 by the drive roll 241 is stretched in the MD direction (stretching step), stretchable fiber 2, the plastic deformation a state of fully extended to a degree (a degree that does not break) does not occur.

By providing such a press roll 242, without providing a stretched section 130 (see FIG. 2) in the first embodiment, it is possible to stretch the nonwoven continuous sheet Sa, the first processing step and second processing the transport distance between the steps can be made shorter than the first embodiment. Thus, it is possible to configure the manufacturing apparatus 200 compact. Further, by the transport distance becomes short, is prevented from nonwoven continuous sheet Sa is excessively stretched in the MD direction, the nonwoven continuous sheet Sa is hardly shrink in the CD direction (width direction). Moreover, shortly after it made stretching process using a press roll 242, (see FIG. 12) for the second processing step is carried out using a gear roll 245 and 246, stretchability, which is drawn at a draw step to near the elastic limit it can be efficiently cut a part of the fibers 2 in the second processing step.

In the present embodiment, (see FIG. 17 W242> WSa, described later) CD width W242 of the press roll 242 which is wider than the width WSa the CD direction of the nonwoven fabric continuous sheet Sa. The outer peripheral surface of the press roll 242 is formed by slip material such as silicone rubber, (a tangential direction perpendicular to the direction of the other words the outer peripheral surface) in the radial direction orientation of the central axis of the second gear rolls 246 with a constant force It is pressed. This makes it possible to transport while pressing without sliding the entire width of the nonwoven continuous sheet Sa to the outer peripheral surface of the second gear roll 246, it can be accurately stretching the nonwoven continuous sheet Sa.

Gear wheels 245 and 246 of the pair is a pair of upper and lower rolls mechanism for rotating around a rotation axis along the CD direction while facing the outer circumferential surface of each other. Figure 13 is a schematic diagram illustrating the configuration of the gear rolls 245. Figure 14 is a schematic diagram illustrating the configuration of the gear rolls 246. Figure 15 is a diagram showing the region X in FIG. Figure 16 is a diagram showing the region Y in FIG. 14.

Of the pair of second gear wheels, whereas gear roll 245 side is substantially similar to the gear roll 145 of the first embodiment, the tooth surface is an area in which a plurality of teeth are formed so as to protrude outside the outer peripheral surface and 245Ts, and the smooth surface 245fs is a region that is not tooth form are arranged alternately. CD width of gear rolls 245 W245 is wider than the width WSa the CD direction of the nonwoven fabric continuous sheet Sa (W245> WSa). As shown in Figure 15, the tooth surface 245Ts, and mountain portions 245m and valley portions 245v in the rotational direction they are alternately formed. Gear rolls plurality of teeth 245 (Yamabe 245m and valleys 245V) is continuously formed along each CD direction, CD direction width W245m the crest 245m (valley 245V) is nonwoven continuous sheet Sa It is narrower than that of the CD direction of the width WSa (WSa> W245m). The thickness T245m (crest 245m in the MD direction of the width of the tip portion) of the tip of the tooth of the gear rolls 245 is about 0.2 mm. Further, gear roll 245, and is capable of heating the tooth surface 245ts to a predetermined temperature (for example, about 120 ° C.) by the heating device such as a heater. It will be described later why heating the tooth of gear rollers 245.

Also, among the pair of second gear wheels, gear roll 246 on the other side, and the tooth surface 246ts outside the outer peripheral surface is a region in which a plurality of teeth are formed so as to be concave, no teeth are formed regions a smooth surface 246fs is are alternately arranged. In this embodiment, the state in which teeth formed on the tooth surface 246ts becomes concave outer peripheral surface, as shown in FIG. 16, inward from the outer peripheral surface of the bottom of the valley portion 246v tooth gear roller 246 is formed on the (central axis side of the gear rolls 246), a state where the top portion of the crest portion 246m of the teeth are formed at the same position as the outer peripheral surface of the gear rolls 246. In other words, the distance from the center of the gear roll 246 to the bottom of the valley portion 246v of the teeth is smaller than the radius of the gear roll 246, the distance from the center of the gear roll 246 to the tip of the crests 246m of teeth is substantially equal to the radius of the gear rolls 246 .

Tooth surface 246ts flanks 245ts and gear roller 246 of the gear rolls 245 are formed at an equal pitch Pm, are disposed opposite each other, meshing with each other the teeth when the gear rolls 245 and 246 rotate, the teeth surfaces 245ts and teeth between the surface 246ts nonwoven continuous sheet Sa passes along the MD direction. Nonwoven continuous sheet Sa is deformed to form three-point bending as described with reference to FIG. 4 in the portion that passes between the tooth surfaces 245ts and 246Ts, it stretched the (second processing step). That is, when the stretchable fiber 2 which has been stretched to near the elastic limit is further stretched, or at least a portion of the stretchable fiber 2 of the plurality of stretchable fiber 2 constituting the nonwoven continuous sheet Sa is cut, stretchable fiber 2 to each other by crimping points which has been crimped are dislodged and low shrinkage regions LS in FIG. 1 is formed.

In the manufacturing apparatus 200, the gear rolls 246 has a function of transporting the nonwoven continuous sheet Sa in the MD direction. That is, as shown in FIG. 12, by rotating by winding a nonwoven continuous sheet Sa in a part of the outer peripheral surface of the gear wheels 246, for conveying the nonwoven continuous sheet Sa in the rotational direction. Therefore, the teeth of the gear roller 246 in the second embodiment has a concave outer peripheral surface, the tip of the crests 246m of the teeth are configured so as not to protrude outward from the outer peripheral surface of the gear rolls 246 . With this configuration, it is possible to convey the non-woven continuous sheet Sa wound around the outer peripheral surface smoothly. Further, since the teeth of the gear rolls 246 does not protrude outside the outer peripheral surface, it is possible to sufficiently stretched sandwich the nonwoven continuous sheet Sa between the press roll 242. If, when you try conveying sandwich the nonwoven continuous sheet Sa between the gear roll 245 and press roll 242 having teeth that is convex on the outside of the outer peripheral surface, the outer circumferential surface when the press roll 242 is rotated the gear rolls 245 state contact only with the tip of the tooth (crest 245m) is generated. In this case, it behaves like a press roll 242 between the teeth of the tooth surface 246Ts (between 2 Tsunoyama portion 245m adjacent) the gear rolls 245 bounces, slippery nonwoven continuous sheet Sa. In contrast, if the transport by sandwiching the nonwoven continuous sheet Sa between the gear roll 246 and press roll 242 having teeth is concave on the outside of the outer circumferential surface, the teeth of the outer peripheral surface gear roll 246 press roll 242 (the mountain see contact with that state between the tip parts 246m) it does not occur. That is, since the constantly pressed against the portion of the outer peripheral surface is the outer peripheral surface of at least the gear roll 246 of the press rolls 242, hardly slip nonwoven continuous sheet Sa, while conveying the nonwoven continuous sheet Sa stably in the MD direction stretching can do.

In the second gear teeth portion 240, in order to convey by winding a nonwoven continuous sheet Sa in a part of the gear rolls 246, the contact position of the nonwoven continuous sheet Sa in the drive roll 241 (a pair of drive rolls 241 are nonwoven continuous sheet Sa the height position) sandwiching the are arranged by shifting the height of the contact position of the nonwoven fabric continuous sheet Sa in the gear roll 246 (gear roll 245 and gear roller 246 and is positioned to sandwich the nonwoven continuous sheet Sa). In Figure 12, the position of the drive roll 241 is low, the respective rolls such that the position of the gear rolls 246 is increased is disposed. Thus, longitudinal tension to the nonwoven continuous sheet Sa between the drive roll 241 and the gear roller 246 occurs, outward from inward force of the outer peripheral surface of the gear rolls 246 in the nonwoven continuous sheet Sa is applied. Therefore, it is possible to transport with wound without displacement of the nonwoven continuous sheet Sa to the outer peripheral surface of the gear rolls 246.

Figure 17 is a schematic diagram for explaining the relationship between the CD direction of the width of the second gear teeth portion 240. CD width W246 of gear rolls 246 is wider than CD width WSa nonwoven continuous sheet Sa (W246> WSa), is approximately the same size as the CD direction of the width W245 of the gear rolls 245. Crest 246m and valleys 246v is continuously formed along the CD direction, the crest width W246m the CD direction of 246m gear rolls 246 is narrower than the CD width WSa nonwoven continuous sheet Sa, and , is wider than the CD direction of the width W245m of the mountain part 245m of the gear roll 245 (WSa> W246m> W245m). Thus, the CD direction, the range of W245m the teeth of gear rollers 245 are arranged within the width WSa nonwoven continuous sheet Sa is drawn. At this time, since it is WSa> W246m, both end portions in the CD direction of the nonwoven continuous sheet Sa (hatched portion in FIG. 17) is a constantly sandwiched state by the outer peripheral surface of the gear wheels 245 and gear roller 246 during transport there. Thus, the nonwoven continuous sheet Sa is less likely to be displaced during transport. By nonwoven continuous sheet Sa passes without misalignment between the tooth surfaces 245ts and tooth surface 246Ts, the stretchable fiber 2 is firmly stretched.

Further, in the present embodiment, the thickness T246m (crest 246m in the MD direction of the width of the tip portion) of the tip of the tooth of the gear rolls 246 is about 0.5 mm. In other words, the thickness T246m of the tip of the tooth of the gear rollers 246 is thicker than the thickness t245m (0.2mm) of the tip of the tooth of the gear roll 245 (t246m> t245m). This is because when pressing the press roll 242 on the outer peripheral surface of the gear rolls 246, in order to prevent the outer peripheral surface of the press roll 242 is damaged. In a state of sandwiching the nonwoven continuous sheet Sa, when the press roll 242 is pressed against the outer peripheral surface of the gear roll 246, the leading end portion of the teeth of the gear rolls 246 and thin (i.e., the teeth are sharp) formed of silicone rubber or the like have been made on the outer peripheral surface of the press roll 242 tends per track of the teeth, there is a risk that the conveying accuracy is gradually deteriorated. Therefore, the tip of the tooth of the gear rollers 246 is the side which contacts the press roll 242, by increasing from the front end portion of the teeth of the gear rollers 245 is the side which does not contact with the press roll 242, the outer peripheral surface of the press roll 242 so that difficult marked with traces of teeth.

=== === the second processing step
Manufacturing apparatus 100 (first embodiment) and a manufacturing apparatus 200 (second embodiment) first in 2 working process, the nonwoven continuous sheet Sa to remove the crimp point or cutting a part of the stretchable fiber 2 is stretched in order to perform better operation or accuracy, in addition to the configuration described in the above embodiments has the following features.

<Heating of the gear rolls>
In the second processing step, among the stretchable fiber 2 and extensible fiber 3 forming the nonwoven continuous sheet Sa, by cutting a portion of the stretchable fiber 2 to form a low shrinkage regions LS in FIG. 1 . In this case, without cutting the extensible fiber 3, it is desirable to be able to cut only stretchable fiber 2. Therefore, in the second gear teeth portion 140 and 240, by applying heat to the nonwoven continuous sheet Sa is conveyed, as well as difficult to be cut easily extend the extensible fiber 3, a part of the stretchable fiber 2 to degrade the structure of easily disconnected.

In the manufacturing apparatus 100 of the first embodiment, while heating the at least one up to a predetermined temperature of the second pair of gear wheels 145 and 146 of gear teeth 140 extending the nonwoven continuous sheet Sa (the second processing step) do. Specifically, at least one of the temperature of the tooth surface 146ts flanks 145ts and gear roller 146 gear rolls 145, higher than the room temperature, and heated to be lower than the melting point of the extensible fiber 3. Heating may be performed by a heater provided outside, may be performed by a heater provided in the gear rolls 145 and 146 themselves.

Nonwoven continuous sheet Sa, by being heated when passing between the gear wheels 145 and 146, the extensible fiber 3 becomes difficult to cut in the second process step easily stretched by heat. On the other hand, stretchable fiber 2, thermoplastic elastomers such as described above (e.g., TPU: Thermoplastic polyurethane) for a fiber, low heat resistance as compared with the extensible fiber 3, or distortion occurs by heating , likely to be cut or degraded. This makes it possible to cut the portion of the stretchable fiber 2 efficiently without cutting the extendable fibers 3 in the second gear teeth portion 140. Further, it is possible to prevent the nonwoven continuous sheet Sa itself is disconnected during transport. Temperature for heating the gear rolls 145, 146 of the temperature below the melting point (about 200 ° C.) of the extensible fiber 3, desirably in a possible high temperature, in the first embodiment, for example, up to about 120 ° C. gear roll heating of the.

In the manufacturing apparatus 200 of the second embodiment, among the gear roll 245 and 246 of the pair of second gear teeth portion 240, while heating the gear roll 245 having teeth is convex to the outer peripheral surface to a predetermined temperature performing stretching of the nonwoven continuous sheet Sa (the second processing step). Conditions of heating method and the heating temperature of the gear rolls 245 are the same as those in the first embodiment. Thus, extensible fiber 3 forming the nonwoven continuous sheet Sa is less likely to be disconnected easily stretch, at least a portion of the stretchable fiber 2 is easily cut.

In the second gear teeth 240 of the second embodiment as described above, the conveyance while winding the nonwoven continuous sheet Sa in a part of the outer peripheral surface of the gear rollers 246 having teeth became concave outward performed. At that time, the gear roll 246 is heated, because of large contact area between the circumferential surface and the nonwoven continuous sheet Sa gear rolls 246, the overall nonwoven continuous sheet Sa is likely to be heated, the strain of the stretchable fiber 2 is excessively larger problems such as is likely to occur in. Therefore, in the second embodiment, by heating only the gear rolls 245 side of the pair of gear rolls 245 and 246, gear roll 246 is not to heat.

<Arrangement of the teeth of the gear rolls>
Tooth gear rolls 145 and 146 used in the second processing step (the first embodiment) and the gear rolls 245 and 246 (second embodiment) is continuously formed respectively in the CD direction. That is, the mountain portions 145m of each tooth, 146m, 245m, 246m are formed so as to have a predetermined width in the CD direction. Since the teeth of the gear rolls is continuously formed in the CD direction, the stretchable fiber 2 over a wide range in the CD direction of the nonwoven continuous sheet Sa (width direction) can be effectively drawn (see FIG. 17 ).

Figure 18 is a diagram for describing drawing of stretchable fiber 2 that is performed in the second processing step. In FIG. 18, an enlarged view of a state in which a plurality of stretchable fiber 2c ~ 2 g constituting the nonwoven continuous sheet Sa is crimped while entangled represents schematically. Among a plurality of stretchable fiber 2, they are crimped together by crimping points WP1 and stretchable fiber 2c and stretchable fiber 2d. Similarly, the stretchable fiber 2d and 2e are crimped together by crimping point WP2, stretchable fiber 2e and 2f are crimped together by crimping point WP2, stretchable fiber 2f and 2g are the are crimped together by crimping point WP4 to. Incidentally, stretchable fiber 2 constituting the nonwoven continuous sheet Sa is long fiber, which is at least because some are arranged along the MD direction, it tends to stretch the MD direction. Further, by such long fibers are crimped by the crimping point WP, mutually have a stretch together express good stretchability for MD direction as a whole nonwoven continuous sheet Sa.

When stretching such a nonwoven continuous sheet Sa in the MD direction, the teeth of the two gear rollers provided to be adjacent to the MD direction, if they are continuously formed in the CD direction, between the two teeth all stretchable fiber 2 present in the area is stretched in the MD direction. For example, stretchable fiber 2c ~ 2 g and in the region between the pitch Pm between ridges 145m1 and crest 145m2 of FIG. 18, the whole of the crimping points WP1 ~ WP4 is stretched in the MD direction. In contrast, if, when the teeth of the gear rolls were formed intermittently in the CD direction, of the plurality of stretchable fiber 2, and the fiber is not drawn fibers being stretched occurs, uniform stretching effect the resulting not fear there is. For example, ridges 145m1 and ridges 145m2 is duplicated with each stretchable fiber 2c and 2d in the CD direction in FIG. 18, when not overlap with stretchable fiber 2e and 2f, stretchable fiber 2c and 2d MD direction However, stretchable fiber 2e and 2f will not be stretched is stretched. In this case, there is a risk that or a difference occurs in the stretchable nonwoven continuous sheet Sa by the CD direction of a region, the distortion in the nonwoven continuous sheet Sa is or generated. Therefore, the teeth of the gear rollers 145,146,245,246 used in the second processing step, it is desirable that the continuously formed respectively in the CD direction.

Furthermore, the teeth (crest 145m1 and crests 145M2) gear rolls are arranged parallel to the CD direction. In other words, it is arranged in the conveying direction (MD direction) and the direction perpendicular nonwoven continuous sheet Sa. With such an arrangement, in between the teeth of the two gear rollers adjacent in the MD direction can be accurately drawn along the nonwoven continuous sheet Sa in the MD direction. For example, stretchable fiber 2c ~ 2 g of FIG. 18 to be stretched in the MD direction at a uniform force in (the region between the crest 145m1 and mountain portions 145M2) the same area in the MD direction, the nonwoven continuous sheet Sa distortion or the like is unlikely to occur. However, the teeth of the gear roller is required to be necessarily disposed in the CD direction parallel without, for example, be subjected to stretch processing be arranged obliquely so as to have a predetermined angle with respect to the CD direction is possible it is.

The spacing between MD direction of the two teeth which are disposed adjacent to the MD direction on each gear rolls (pitch) is larger than the pitch in the MD direction of the crimping points WP for crimping stretchable fiber 2 to each other. With such a configuration, in the second processing step, between the pitch of the teeth of the second gear rolls, the probability of crimping points WP for crimping stretchable fiber 2 to each other is contained at least one or more is high. In Figure 18, the crest 145m1 and pitch Pm between the ridges 145M2 (Distance MD direction) is wider than the shortest distance Pwp the MD direction between the crimping point WP1 and the crimping point WP2 (P1 > Pwp), contains four crimping points WP1 ~ WP4 between the teeth of the gear rollers. When the region of Pm at this condition is stretched in the MD direction, since the stretchable fiber 2 crimping points WP1 ~ WP4 which to each other has been crimped tends out weakens the stretchability in the MD direction, the low shrinkage in Figure 1 region LS is easily formed.

On the other hand, (in FIG. 18 Pm) of the two MD direction of the tooth spacing between (in FIG. 18 Pwp) MD direction between the crimping point WP or less (Pm ≦ Pwp), stretchable fiber between two teeth which may not include crimping point WP crimping the 2 together. In this case, since the region of the Pm does not even exist crimp point WP in the area as being stretched in the MD direction, stretchable fibers 2 to each other will remain crimped, stretchability in the MD direction in comparison with the case of the above hard to be weak. Therefore, in the manufacturing apparatus 100 and the manufacturing apparatus 200, the spacing in the MD direction of the teeth of the gear rolls have to be wider than the pitch in the MD direction of the crimping points WP for crimping stretchable fiber 2 to each other.

In the above embodiment, the crimping point WP is to be formed by embossing or the like to the nonwoven continuous sheet Sa, the MD direction of the crimping point WP of the shortest distance Pwp size and teeth of the second gear rolls it is possible to adjust the size of the pitch Pm.

=== Other ===
The embodiments described above are intended to facilitate understanding of the present invention and are not to be construed as limiting the present invention. The present invention, without departing from the spirit thereof, may be changed or improved, the present invention is, of course, includes the equivalents thereof.

In the above-described embodiment, the first gear teeth portion 120, and, for a pair of gear rolls provided in the second gear teeth portion 140, which had been described with reference to FIGS. 4 and 6, the gear shapes and sizes It is is not limited to this. For example, among the pair gear rolls, the outer peripheral surface of one of the gear rolls are projections formed on the outer peripheral surface of the other gear rolls are grooves corresponding to the convex portion (concave portion) is formed, a convex by parts and groove and engages, it may have a structure such as to stretch the nonwoven fabric sheet passing therebetween. Further, by changing the height and engagement length of the teeth formed on each of the gear rolls, the draw ratio of the nonwoven fabric may be adjusted.

In the above embodiment, as an example of use of the elastic nonwoven fabric 1 has been described diaper 5 three-piece type, an example of using the elastic nonwoven fabric 1 is not limited to this. For example, or pants type disposable diaper, napkin, textile sheets or the like, the use of elastic nonwoven fabric 1 to the absorbent article in general with non-woven fabric.

1 stretchable nonwoven fabric,
2 elastic fibers, 2a ~ 2g elastic fibers,
3 extendable fibers,
5 disposable diapers (diapers),
51 absorbent main body,
52 ventral band member, 52e widthwise short edges,
53 back-side band member, 53e widthwise short edges,
5HB waist-opening, 5HL leg-openings,
100 manufacturing equipment,
110 heating unit,
111-114 heating roller,
120 first gear processing unit,
121 guide roller,
125 gear roll, 125m crest, 125v valley,
126 gear roll, 126m crest, 126v valley,
130-stretched portion,
131 upstream nip rolls 132 downstream nip rolls,
140 second gear processing unit,
145 gear roll,
145ts tooth surface, 145m crest, 145m1 · 145m2 crest, 145v valley,
145fs smooth surface,
146 gear roll,
146ts tooth surface, 146m crest, 146v valley,
146fs smooth surface,
150 sheet member bonding part,
151 adhesive applying section, 152 laminating rolls,
200 manufacturing equipment,
210 heating unit,
211-214 heating roller,
220 first gear processing unit,
221 guide roller,
225 gear roll,
226 gear roll,
240 second gear processing unit,
241 drive roll,
242 press roll,
245 gear roll,
245ts tooth surface, 245m crest, 245v valley,
245fs smooth surface,
246 gear roll,
246ts tooth surface, 246m crest, 246v valley,
246fs smooth surface,
250 sheet member bonding portion,
251 adhesive applying section, 252 laminating rolls,
CV transport mechanism,
HS high shrinkage region, LS low shrinkage regions,
S nonwoven sheet, Sa nonwoven continuous sheet, Sb another sheet member,
WP crimping point, CE cut ends

Claims (12)

  1. A stretchable fiber having stretchability, a conveying step of conveying the nonwoven fabric in the conveying direction and a low elongation fiber shrinkage than the stretchable fiber,
    The nonwoven fabric was stretched by passing between a pair of first gear roll, a first processing step of extending at least a portion of the extensible fiber,
    After the first processing step, a stretching step of stretching the nonwoven fabric in the conveying direction,
    After the stretching step, the nonwoven fabric, is stretched by passing between the second gear roll pair and a portion not formed with portions having teeth formed on the peripheral surface, at least a portion of the a second processing step for cutting the stretchable fiber,
    The a method for producing a stretchable nonwoven fabric, characterized in that.
  2. A method of manufacturing a stretchable nonwoven fabric according to claim 1,
    Of the second gear rolls of said pair, to heat at least one of the gear roll to a temperature lower than the melting point of the extensible fiber, method for producing stretchable nonwoven fabric, characterized in that.
  3. A method of manufacturing a stretchable nonwoven fabric according to claim 1 or 2,
    Wherein one tooth of the second gear rolls pair, method for producing stretchable nonwoven fabric, wherein both are formed to be convex towards the outside of the circumferential surface, it.
  4. A method of manufacturing a stretchable nonwoven fabric according to claim 1 or 2,
    Of the second gear rolls of the pair, one side tooth gear rolls of is formed to be convex towards the outside of the circumferential surface,
    Wherein among the pair of second gear wheels, the manufacturing method of the stretchable nonwoven fabric teeth gear rolls on the other side, characterized in the formed, it becomes a concave toward the outside of the circumferential surface.
  5. A method of manufacturing a stretchable nonwoven fabric according to claim 4,
    By a pair of drive rolls provided between the conveying direction of the second gear rollers of the first gear rolls and the pair of the pair, and transporting the said non-woven fabric in the transport direction at a predetermined speed,
    The press roll disposed downstream of the conveying direction than the pair of drive rolls, wherein the nonwoven fabric the nonwoven fabric, while pressed against the outer peripheral surface of the gear roll of the other side of the second gear rolls of the pair by transporting the transport direction at a speed higher than a predetermined speed,
    Method for producing a stretchable nonwoven fabric, characterized in that, to stretch the nonwoven fabric in the conveying direction.
  6. A method of manufacturing a stretchable nonwoven fabric according to claim 4 or 5,
    Method for producing a stretchable nonwoven fabric, wherein the said other hand the side gear rolls of the pair of second gear rolls heated to a temperature lower than the melting point of the extensible fiber, it.
  7. A method of manufacturing a stretchable nonwoven fabric according to any one of claims 4-6,
    Gear wheels of the other side of the second gear rolls of said pair, said non-woven fabric carrying the nonwoven fabric in the transport direction by rotating in a state wound around at least a portion of the peripheral surface, and wherein the expansion manufacturing method of gender non-woven fabric.
  8. A method of manufacturing a stretchable nonwoven fabric according to any one of claims 4-7,
    The thickness of the tip of the tooth of the gear roll of the other side of the second gear rolls of said pair,
    Greater than the thickness of the tip of the tooth of the one side gear rolls of the second gear rolls of said pair, a manufacturing method of the stretchable nonwoven fabric, characterized in that.
  9. A method of manufacturing a stretchable nonwoven fabric according to any one of claims 1 to 8,
    It said pair of teeth of the second gear rolls of the manufacturing method of the stretchable nonwoven fabric in the CD direction are respectively a direction orthogonal to the conveying direction are continuously formed, it is characterized.
  10. A method of manufacturing a stretchable nonwoven fabric according to claim 9,
    It said pair of teeth of the second gear rolls of the manufacturing method of the stretchable nonwoven fabric, wherein the CD direction and are arranged along a direction parallel to it.
  11. A method of manufacturing a stretchable nonwoven fabric according to any one of claims 1 to 10,
    Fibers constituting the stretchable nonwoven fabric is long-fiber,
    2 or more of the long fibers have been crimped together by a plurality of crimping points method for producing a stretchable nonwoven fabric, characterized in that.
  12. A method of manufacturing a stretchable nonwoven fabric according to claim 11,
    Said second processing step,
    Method for producing a stretchable nonwoven fabric, wherein said performed using a pair of second gear wheels, to have a broad pitch teeth than the shortest distance between two of said crimping points adjacent in the transport direction.
PCT/JP2015/085667 2014-12-26 2015-12-21 Elastic nonwoven fabric manufacturing method WO2016104422A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2014265424 2014-12-26
JP2014-265424 2014-12-26
JP2015-248236 2015-12-21
JP2015248236A JP6357462B2 (en) 2014-12-26 2015-12-21 The method of producing stretchable nonwoven fabric

Applications Claiming Priority (1)

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CN201580070959.5A CN107109734B (en) 2014-12-26 2015-12-21 The manufacturing method of flexible nonwoven fabrics

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002273808A (en) * 2001-03-16 2002-09-25 Daio Paper Corp Method for manufacturing elastic sheet and paper diaper using the same
WO2006115259A1 (en) * 2005-04-25 2006-11-02 Kao Corporation Stretch sheet and process for producing the same
JP2008061692A (en) * 2006-09-05 2008-03-21 Kao Corp Production method of stretching sheet
JP2008061691A (en) * 2006-09-05 2008-03-21 Kao Corp Production method of stretching sheet
JP2011505178A (en) * 2007-11-19 2011-02-24 ザ プロクター アンド ギャンブル カンパニー Device for activating the web
WO2011065264A1 (en) * 2009-11-27 2011-06-03 ユニ・チャーム株式会社 Manufacturing method of composite sheet and manufacturing device
JP2012077401A (en) * 2010-09-30 2012-04-19 Uni Charm Corp Nonwoven cloth, and absorbent article comprising the same nonwoven cloth, and formation method of the sane nonwoven cloth
JP2013208386A (en) * 2012-03-30 2013-10-10 Unicharm Corp The absorbent article

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002273808A (en) * 2001-03-16 2002-09-25 Daio Paper Corp Method for manufacturing elastic sheet and paper diaper using the same
WO2006115259A1 (en) * 2005-04-25 2006-11-02 Kao Corporation Stretch sheet and process for producing the same
JP2008061692A (en) * 2006-09-05 2008-03-21 Kao Corp Production method of stretching sheet
JP2008061691A (en) * 2006-09-05 2008-03-21 Kao Corp Production method of stretching sheet
JP2011505178A (en) * 2007-11-19 2011-02-24 ザ プロクター アンド ギャンブル カンパニー Device for activating the web
WO2011065264A1 (en) * 2009-11-27 2011-06-03 ユニ・チャーム株式会社 Manufacturing method of composite sheet and manufacturing device
JP2012077401A (en) * 2010-09-30 2012-04-19 Uni Charm Corp Nonwoven cloth, and absorbent article comprising the same nonwoven cloth, and formation method of the sane nonwoven cloth
JP2013208386A (en) * 2012-03-30 2013-10-10 Unicharm Corp The absorbent article

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