CN110325679A

CN110325679A - Non-woven fabrics and its manufacturing method and absorbent commodity and absorbing sweat piece is laminated

Info

Publication number: CN110325679A
Application number: CN201780087145.1A
Authority: CN
Inventors: 福田优子; 小林秀行; 凑崎真行; 奥田泰之
Original assignee: Kao Corp
Current assignee: Kao Corp
Priority date: 2017-03-15
Filing date: 2017-03-15
Publication date: 2019-10-11
Anticipated expiration: 2037-03-15
Also published as: WO2018167882A1; JP6539007B2; JPWO2018167882A1; RU2723405C1; CN110325679B

Abstract

The present invention provides a kind of stacking non-woven fabrics, and stacking non-woven fabrics (10) of the invention has the lit-par-lit structure (13) of the fibrous layer containing thermoplastic fibre.Lit-par-lit structure (13) has as first face (10a) on a surface of stacking non-woven fabrics (10) and as second face (10b) on another surface, first face (10a) is made of hydrophilic first layer (11), is configured with the hydrophobic second layer (12) in the second face side (10b) of first layer (11).Lit-par-lit structure (13) has thickness smaller than peripheral portion and constitutes the interlayer weld portion (16) that each layer of the lit-par-lit structure (13) is welded together each other.First layer (11) is in addition to having interlayer weld portion (16), weld portion (17) between the fiber that composition fiber also smaller than peripheral portion with thickness and first layer (11) is welded together each other.The weld portion the area ratio in the first face (10a) is bigger than the second face (10a).The stacking non-woven fabrics (10) of this structure is excellent in the absorbent properties of the body fluid such as sweat or urine.

Description

Non-woven fabrics and its manufacturing method and absorbent commodity and absorbing sweat piece is laminated

Technical field

The present invention relates to the stacking non-woven fabrics with lit-par-lit structure made of multiple non-woven fabrics are laminated and use the stacking The absorbent commodity and absorbing sweat piece of non-woven fabrics.

Background technique

In the absorbent commodities such as disposable diaper, sanitary napkin, at present using the lit-par-lit structure with 2 layers or more Non-woven fabrics, surface has indent and convex non-woven fabrics etc. and is used as component parts.For example, patent document 1 is recorded in disposable diaper In the position contacted with the skin of wearer be configured with absorbable wearer sweat absorbing sweat piece technology, in addition, recording Have as the absorbing sweat piece, using the lit-par-lit structure with hydrophobic nonwoven and hydrophilic non-woven, and two non-woven fabrics pass through it is recessed The technology of stacking non-woven fabrics for falling into multiple heat-fused portion in a concave shape and being joined to each other records this and is layered without in turn The technology that woven fabric configures in such a way that the hydrophobic nonwoven is towards the skin side of wearer.

In patent document 2, it as the stacking non-woven fabrics for the component parts for being suitable for absorbent commodity, records from some Face direction has liquid permeability, does not have the unidirectional transmissibility non-woven fabric plate of liquid permeability the other way around, in addition, unidirectionally leading as this The embodiment of aqueous non-woven fabric piece records at least 1 layer as the non-woven fabrics after hydrophiling, and remainder layer is the nonwoven of non-hydrophiling The embodiment of cloth.In addition, in patent document 2, as the manufacturing method of stacking non-woven fabrics, recording makes multiple non-woven fabrics weights Method that is folded, carrying out thermal welding processing using hot pressing flower roll, in turn, as other manufacturing methods, there are as below methods for record, that is, Directly accumulation has the long fibre for providing fiber number on spun-bonded non-woven fabrics, next, utilizing needle thorn, water spray, ultrasonic sealing function etc. Means are interleaved processing, or carry out thermal welding processing using hot pressing flower roll.

In addition, in patent document 3, as the functional filter for extracting coffee or black tea, recording by hydrophobic Property the internal layer that constitutes of superfine fibre non-woven fabrics and the outer layer that constitutes of the non-woven fabrics of synthetic fiber by being attached with hydrophilic agent pass through bonding Agent or heat embossing processing and local engagement together made of non-woven fabrics is laminated.

Existing technical literature

Patent document

Patent document 1: Japanese Unexamined Patent Publication 2004-298467 bulletin

Patent document 2: Japanese Unexamined Patent Publication 2006-51649 bulletin

Patent document 3: Japanese Unexamined Patent Publication 2002-233720 bulletin

Summary of the invention

The object of the present invention is to provide a kind of stacking non-woven fabrics, the layer with the fibrous layer containing thermoplastic fibre Folded construction.Above-mentioned lit-par-lit structure has first face on a surface as above-mentioned stacking non-woven fabrics and as another surface Second face, first face are made of hydrophilic first layer, are configured with hydrophobic second in second surface side of the first layer Layer.Above-mentioned lit-par-lit structure has thickness smaller than peripheral portion and constitutes the layer that each layer of the lit-par-lit structure is welded together each other Between weld portion.Above-mentioned first layer is also smaller than peripheral portion with thickness and the first layer in addition to above-mentioned interlayer weld portion Weld portion between the fiber that composition fiber is welded together each other.Will be relative to above-mentioned first face and above-mentioned second face respectively Area for, the above-mentioned interlayer weld portion in the face and between above-mentioned fiber total area of weld portion ratio it is referred to as respective In the case where the weld portion the area ratio in face, the weld portion the area ratio in above-mentioned first face is greater than the weld portion area in above-mentioned second face Rate.

In addition, the present invention provides a kind of manufacturing method that non-woven fabrics is laminated, which has fine containing thermoplasticity The lit-par-lit structure of the fibrous layer of dimension, each layer for constituting the lit-par-lit structure are mutually welded together each other by interlayer weld portion. The manufacturing method of stacking non-woven fabrics of the invention includes: the process for obtaining laminated body, conveying have thickness it is smaller than peripheral portion and The hydrophilic base non-woven fabrics for constituting weld portion between the fiber that is welded together each other of fiber, substrate in its conveying without Resin is carried out hydrophobic fibre obtained from spinning by accumulation in woven fabric, obtains laminated body；It, will be above-mentioned with interlayer fusion bonding process Laminated body is locally compressed and is heated in a thickness direction, forms above-mentioned interlayer weld portion.

In addition, the present invention provides a kind of absorbent commodity, there is stacking non-woven fabrics, which has containing heat The lit-par-lit structure of the fibrous layer of Plasitc fibers.Above-mentioned lit-par-lit structure has first of a surface as above-mentioned stacking non-woven fabrics Face and the second face as another surface, which is made of hydrophilic first layer, in second face of the first layer Side is configured with the hydrophobic second layer.Above-mentioned lit-par-lit structure have thickness it is smaller than peripheral portion and constitute each layer of the lit-par-lit structure that This interlayer weld portion being mutually welded together.Above-mentioned first layer also has thickness ratio in addition to above-mentioned interlayer weld portion Weld portion between the fiber that peripheral portion is small and the composition fiber of the first layer is welded together each other.Will be relative to above-mentioned On one side and for the above-mentioned respective area in second face, the above-mentioned interlayer weld portion in the face and between above-mentioned fiber weld portion conjunction In the case that the ratio of meter area is known as the weld portion the area ratio in respective face, the weld portion the area ratio in above-mentioned first face is greater than above-mentioned The weld portion the area ratio in the second face.The second mode facing towards the skin side of wearer more than above-mentioned stacking non-woven fabrics is stated to configure.

In addition, the present invention provides a kind of absorbing sweat piece, the lit-par-lit structure with the fibrous layer containing thermoplastic fibre has First face and the second face positioned at its opposite side, by make this second facing towards the skin side of wearer in a manner of use.Above-mentioned It is made of on one side hydrophilic first layer, is configured with the hydrophobic second layer in above-mentioned second surface side of the first layer.Above-mentioned layer It is folded to construct the interlayer weld portion that each layer that is smaller than peripheral portion with thickness and constituting the lit-par-lit structure is welded together each other. Above-mentioned first layer in addition to above-mentioned interlayer weld portion, also with thickness is smaller than peripheral portion and the composition fiber of the first layer that Weld portion between this fiber being mutually welded together.Will be for above-mentioned first face and the above-mentioned respective area in second face , the above-mentioned interlayer weld portion in the face and ratio of total area of weld portion is known as the weld portion in respective face between above-mentioned fiber In the case where the area ratio, the weld portion the area ratio in above-mentioned first face is greater than the weld portion the area ratio in above-mentioned second face.

Detailed description of the invention

Fig. 1 is the section along thickness direction for showing schematically an embodiment of stacking non-woven fabrics of the invention Cross-sectional view.

(a) of Fig. 2~Fig. 2 (d) is the figure for showing schematically the pattern of interlayer weld portion of the invention respectively.

(a) of Fig. 3~Fig. 3 (h) is the figure of the pattern of weld portion between showing schematically fiber of the invention respectively.

(a) of Fig. 4~Fig. 4 (d) is the weld portion in the first face for show schematically present invention stacking non-woven fabrics respectively The figure of the pattern of (weld portion between interlayer weld portion and fiber).

Fig. 5 is the skeleton diagram of an embodiment of the manufacturing method of stacking non-woven fabrics of the invention.

Fig. 6 is the schematic isometric of the pull-on disposable diaper of an embodiment of absorbent commodity of the invention.

Fig. 7 is the expansion for showing schematically diaper shown in fig. 6 and the skin abutment face side (inner surface under elongation state Side) open cube display.

Fig. 8 is the longitudinal section view for showing schematically the I-I line section of Fig. 7.

Specific embodiment

As described in Patent Documents 1 to 3, multiple non-woven fabrics are made to be layered without made of its integration to be overlapped heat embossing processing Woven fabric is difficult to realize constitute the reduction of the grammes per square metre of each layer of its lit-par-lit structure, and the reduction of the especially grammes per square metre of hydrophobic layer is very tired It is difficult.Therefore, this stacking non-woven fabrics becomes high grammes per square metre, high rigidity on the whole, is being used as the component parts of absorbent commodity In the case of, it is possible to incur the decline etc. of wearing feeling, in addition, configuring the position nearest in the skin from wearer in hydrophobic layer In the case where, the absorbability of the body fluid such as sweat or urine is deteriorated.

In addition, the manufacturing method as stacking non-woven fabrics, it is known that there are as below methods, that is, makes fiber from along mechanical direction (MD) multiple spinnerets of interval configuration successively hang down, accumulate, right in side farther downstream than the spinneret positioned at the most downstream of MD The deposit of those fibers implements heat embossing processing, makes its integration.Because of the stacking formed by this so-called direct fabrics The grammes per square metre of non-woven fabrics is relatively low, rigidity is low, so the case where hydrophobic layer is configured at the position nearest from wearer's skin Under, can absorb body fluid around the embossed portion of the hydrophobic layer, but because around the embossed portion densely there are with this The composition fiber of the adjacent hydrophilic layer of hydrophobic layer, and the thickness of the hydrophobic layer is than relatively thin, so body fluid is easy to concentrate on Around the embossed portion, it is easy to happen liquid reflux.

Therefore, the issue of the present invention is to provide a kind of excellent stacking non-woven fabrics of the absorbent properties of the body fluid such as sweat, urine and Its manufacturing method and absorbent commodity and absorbing sweat piece.

In the following, based on its preferred embodiment and the present invention will be described referring to attached drawing.Fig. 1 is to schematically show The section along thickness direction Z of the stacking non-woven fabrics 10 of one embodiment of stacking non-woven fabrics of the invention.Nonwoven is laminated Cloth 10 has the lit-par-lit structure 13 of the fibrous layer containing thermoplastic fibre, constituted for the fibrous layer is typical non-woven fabrics, that is, single layer without Woven fabric (such as spun-bonded non-woven fabrics) or each layer that non-woven fabrics (such as SMS non-woven fabrics) is laminated.Lit-par-lit structure 13 has as stacking First face 10a of one surface (outer surface) of non-woven fabrics 10 and as stacking non-woven fabrics 10 another surface (outer surface) The second face 10b positioned at the first face 10a opposite side.

As one of the main feature of stacking non-woven fabrics 10, lit-par-lit structure 13 can be enumerated on thickness direction Z with hydrophilic Spend gradient this point.That is, first face 10a is by the hydrophilic first layer 11 containing hydrophilic fibre 14 in lit-par-lit structure 13 It constitutes, in addition, being configured with the hydrophobic second layer 12 containing hydrophobic fibre 15 in the second face side 10b of first layer 11, leads to This structure is crossed, " the first face side 10a water-wetness compared with the second face side 10b is relatively high " is imparted in this way to lit-par-lit structure 13 Water-wetness gradient, in addition, imparting to hydrophilic first layer 11, " water-wetness of the first face side 10a is relatively low, the second face The water-wetness of the side 10b is relatively high " as water-wetness gradient.

In stacking non-woven fabrics 10 shown in Fig. 1, lit-par-lit structure 13 is hydrophilic first layer 11 and hydrophobic second 2 layers of 12 construction of layer, the first face 10a are formed by first layer 11, be it is hydrophilic, it is thin that the second face 10b is formed by the second layer 12 Aqueous.In addition, here, so-called " number of plies of lit-par-lit structure 13 is 2 layers " only finger-type state or different two layers of function Total number of plies of (first layer 11, the second layer 12), it is not necessarily consistent with the number of plies of proper fibrous layer (non-woven fabrics). That is, as described later, first layer 11 and the second layer 12 not only can be the non-woven fabrics of monolayer constructions respectively, it can also be 2 layers or more Multi-ply construction non-woven fabrics (such as SMS non-woven fabrics), for example, first layer 11 is SMS non-woven fabrics, the second layer 12 is single layer structure In the case where the non-woven fabrics made, as lit-par-lit structure 13, even 2 layers of construction being made of first layer 11 and the second layer 12, make For the 4 layers total of 1 layer in 3 layers in the number of plies and first layer 11 of practical non-woven fabrics and the second layer 12.In short, first layer 11 and the second layer 12 respectively can be 2 layers or more.

In the present invention, the water-wetness of aggregate, that is, fibrous layer (non-woven fabrics) of fiber based on measured with following methods with The contact angle of water judges, if the contact angle if it is 90 degree or more of situation is then thin for hydrophily less than 90 degree It is aqueous.With following methods measure it is smaller with the contact angle of water, hydrophily is higher (hydrophobicity is lower), and the contact angle is bigger, parent Aqueous lower (hydrophobicity is higher).In the lit-par-lit structure 13 of stacking non-woven fabrics 10, hydrophilic first layer 11 with following sides For the contact angle of method measurement less than 90 degree, the contact angle of the hydrophobic second layer 12 measured with following methods is 90 degree or more.

The measuring method > of the contact angle of < fibrous layer (non-woven fabrics)

The vertical view quadrangle form of the direction the MD direction 150mm, CD 70mm is cut out from measure object fibrous layer (non-woven fabrics) As measurement sample, make the drop of ion exchange water be attached to measurement sample contact angle measured face on, to the drop into Row video recording measures contact angle based on the image that it is recorded.More specifically, as measurement device, Co., Ltd.'s Keyemce is used (KEYENCE) the microscope VHX-1000 manufactured, wherein being equipped with moderate multiplying factor zoom lens with state in 90 ° of falling.It will survey Random sample product are with measured state upwardly, and the mode from capable of carrying out from the direction CD of measurement sample is placed on measurement dress On the measurement platform set.Then, the drop of the ion exchange water of 3 μ L is made to be attached to the measured of the measurement sample for being placed in measurement platform On face, the image of its drop is recorded, is read in measurement device.In the multiple images recorded, the side CD of 10 drops is selected To the relatively clear image in both ends or one end, be directed to 10 images respectively, the contact angle of drop measured, with these contact angles Average value be measure object fibrous layer (non-woven fabrics) contact angle.Determination of the environment is set as 20 DEG C/50%RH.

First layer 11 is constituted based on hydrophilic fibre 14, therefore becomes hydrophilic layer.In addition, the second layer 12 is to dredge It is constituted based on aqueous fiber 15, therefore becomes hydrophobic layer.Hydrophily of the first layer 11 at least containing 50 mass % or more Fiber 14, the content of hydrophilic fibre 14 may be 100 mass % relative to the gross mass of first layer 11.In addition, the second layer 12 hydrophobic fibre 15 at least containing 70 mass % or more, gross mass of the content of hydrophobic fibre 15 relative to the second layer 12 It may be 100 mass %.

In the present invention, the water-wetness of fiber is judged based on being measured with following methods with the contact angle of water, if should Contact angle is then hydrophily less than 90 degree, is then hydrophobicity if it is 90 degree or more of situation.With following methods measure with The contact angle of water is smaller, and hydrophily is higher (hydrophobicity is lower), and the contact angle is bigger, and hydrophily is lower (hydrophobicity is higher).? It is laminated in non-woven fabrics 10, constitutes the contact angle of the hydrophilic fibre 14 of the first layer 11 of lit-par-lit structure 13 measured with following methods Less than 90 degree, the contact angle measured with following methods for constituting the hydrophobic fibre 15 of the second layer 12 is 90 degree or more.

The measuring method > of < contact angle

Fiber, contact angle of the measurement water phase for the fiber are taken out from measure object (stacking non-woven fabrics).It is fine taking out When dimension, using scissors and tweezers, in addition, the taking-up position of the fiber of the stacking non-woven fabrics as measure object be set as the first face and The respective outmost surface in second face (outermost) and the region clipped by the first face and the second face that non-woven fabrics is laminated.As survey Determine device, uses the automatic contact angle instrument MCA-J of consonance interface science Co., Ltd. manufacture.It is used in the measurement of contact angle Deionized water.It will be from ink-jet mode water droplet blowing unit (Cluster Technology corporation, the arteries and veins that blowing unit aperture is 25 μm Rush injector CTC-25) spray liquid measure be set as 15 picoliters, water droplet is dripped to the surface of fiber.The situation that will be dripped It is recorded in the high speed video device being connect with horizontally disposed camera.From the viewpoint of carrying out image analysis later, record As device is preferably using the personal computer for being assembled with high speed capture device.In this measurement, every 17msec records an image. In the image recorded, using accompanying software FAMAS, (version of software is 2.6.2, and analysis method is sessile drop method, analysis side Method is the method for θ/2, and image processing algorithm is areflexia, and image procossing image model is frame, threshold levels 200, without song Rate amendment), on fiber drop have water droplet initial image carry out image analysis, calculate water droplet the face contacted with air and Filamentous angle, as contact angle.The fiber taken out from measuring object is cut into fibre length 1mm, by the fiber It is placed on the sample table of contact angle instrument, and maintenance level.For a fiber, the contact angle at different two is measured.Measure N 1 after=5 contact angles to decimal point, the average value of the measured value at total 10 (is rounded up to the 2nd after decimal point Position) it is defined as the contact angle of the fiber and water.Determination of the environment is set as 22 ± 2 DEG C of room temperature, 65 ± 2%RH of humidity.This contact angle Value it is smaller, it is meant that hydrophily is higher.

In addition, (such as fine containing measurement sample in the component parts (such as positive dough sheet or absorbing sweat piece) of absorbent commodity Dimension) in the case where, as the method for acquisition measurement sample, pass through bonding agent, welding etc. in the component parts containing measurement sample And in the case where being fixed on other component parts, it needs to take releasing it to fix, is taken out from absorbent commodity containing measurement sample The method of the component parts of product, but in the case where the component parts containing measurement sample is not fixed to other component parts, The method that the acquisition measurement sample directly from absorbent commodity can be taken.In addition, the fixation as above-mentioned releasing component parts Method, in absorbent commodity, it is preferred to use reduce with cooling devices such as cold spraying devices for measure object constituting portion After bonding agent of the engagement of part and other component parts etc., then the method for carefully taking out measure object component parts.This takes Out in the measurement related with measure object of the invention such as the measurement of method applied to distance and fiber number between aftermentioned fiber.Separately Outside, from the viewpoint of it will be suppressed to minimum limit to the influence for the hydrophilic agent for being imparted to component parts, as fixed part Minimizing technology, had better not be incurred using the coating or be possible to as hair dryer blowing hot-air of solvent finish it is rotten, The method of loss.

As hydrophobic fibre 15, hydrophobic thermoplastic fibre (meldable fibre) can be used.As hydrophobic fibre 15 Raw material, as hydrophobic thermoplastic resin, such as the polyolefin such as polyethylene, polypropylene can be enumerated；Poly terephthalic acid The polyester such as glycol ester；The polyamide such as nylon 6, nylon66 fiber；Polyacrylic acid, polyvinyl chloride, gathers partially polyalkyl methacrylate Dichloroethylene etc., can be used alone one of they or is applied in combination two or more.

On the other hand, as hydrophilic fibre 14, hydrophilic thermoplastic fibre (meldable fibre) can be used, specifically Saying, such as be also possible to polyacrylonitrile fibre etc. natively has hydrophilic thermoplastic fibre, or is also possible to available The hydrophobic thermoplastic's fiber for making hydrophobic fibre 15 implements the fiber of hydrophilicity-imparting treatment, and can be used alone one of they Or it is applied in combination two or more.As " thermoplastic fibre after hydrophilicity-imparting treatment " of the latter, such as can enumerate mixed with hydrophiling The thermoplastic fibre of agent, surface are attached with the thermoplastic fibre of hydrophilic agent, implement the thermoplastic fibre of corona treatment Deng.Hydrophilic agent is just not particularly limited if it is common hydrophilic agent used in health product purposes.

Hydrophilic fibre 14 and hydrophobic fibre 15 can also by a kind of synthetic resin (thermoplastic resin) or be mixed respectively The Single Fiber that the polymer blend of the above synthetic resin is constituted there are two types of closing, or it is also possible to composite fibre.It is referred to herein Composite fibre refer to it is with spinning head that the different two or more synthetic resin (thermoplastic resin) of ingredient are compound, be at the same spin The obtained synthetic fibers (thermoplastic fibre) of silk, and continuously constructed on the length direction of fiber respectively with Multiple components Fiber made of being mutually bonded in single fiber.As the form of composite fibre, there are core-sheath-type, parallel type etc., be not particularly limited.

First layer 11 and the second layer 12 can be the non-woven fabrics (staple fiber nonwoven fabric) based on staple fiber respectively, or It is also possible to the non-woven fabrics (nonwoven fabric of long fibers) based on long fibre.It is mentioned here refer to " as main body " staple fiber or Long fibre ratio shared in the gross mass of non-woven fabrics is 70 mass % or more, which is usually 100 mass %.

As staple fiber nonwoven fabric, such as hot-wind nonwoven cloth, spunlace non-woven cloth, needle punched non-woven fabrics, chemical adhesion can be enumerated Non-woven fabrics, in addition, the fibre length of the main composition fiber (staple fiber) of the non-woven fabrics is preferably 15mm or more 100mm or less.

In the present invention, " long fibre " refers to the fiber of the fibre length with 30mm or more.In particular, when being that fiber is long When degree is the so-called continuous fiber of 150mm or more, then the high nonwoven fabric of long fibers of breaking strength can be obtained, it is excellent in this regard Choosing.In addition, the upper limit of the fibre length of above-mentioned " long fibre " is not particularly limited.In addition, so-called " nonwoven fabric of long fibers ", typical Ground refer to have long fibre is intermittently fixed together by heat-fused portion made of fiber assembly non-woven fabrics.As this Kind of nonwoven fabric of long fibers, such as the single-layer nonwovens such as spun-bonded non-woven fabrics, melt spraying non-woven fabrics can be enumerated or will be based on long fibre Spunbond layer, meltblown layer etc. be laminated stacking non-woven fabrics, using fabric hot rolled nonwoven fabrics made of combing method etc., as the stacking Non-woven fabrics, such as spunbond-spunbond stacking non-woven fabrics (SS non-woven fabrics), spunbond-spunbond-spunbond stacking non-woven fabrics can be enumerated (SSS non-woven fabrics), spunbond-meltblown-spunbond fold non-woven fabrics (SMS non-woven fabrics), spunbond-meltblown-meltblown-spunbond nonwoven Cloth (SMMS non-woven fabrics) etc..

In addition, the manufacturing method of aftermentioned stacking non-woven fabrics of the invention has following process, that is, conveying eventually becomes the One layer 11 of hydrophilic base non-woven fabrics, resin dredge obtained from spinning by accumulation on the substrate non-woven fabrics in its conveying Aqueous fiber 15 obtains laminated body, at this moment, in being layered without for producing and using the manufacturing method of this direct spinning In woven fabric 10, first layer 11 can be staple fiber nonwoven fabric, be also possible to nonwoven fabric of long fibers, but containing made of direct fabrics The second layer 12 of hydrophobic fibre 15 is nonwoven fabric of long fibers.In general, the intensity of nonwoven fabric of long fibers is more than staple fiber nonwoven fabric It is excellent.

As one of other features of main feature of stacking non-woven fabrics 10, can enumerating tool, there are two types of thickness is smaller than peripheral portion And constitute fiber " small thickness weld portion " this point made of welding each other.That is, there is lit-par-lit structure 13 thickness to compare periphery Portion is small and constitutes each layer of lit-par-lit structure 13 interlayer weld portion 16 made of welding each other, in addition, constituting lit-par-lit structure 13 First layer 11 in addition to interlayer weld portion 16, also with thickness is smaller than peripheral portion and the composition fiber of the first layer 11 that Weld portion 17 between fiber made of this mutual welding.In interlayer weld portion 16, each layer of lit-par-lit structure 13 is constituted (in diagram Be first layer 11, the second layer 12 in form) composition fiber be heating-fusion bonded each other, and these each layers are each other by phase Mutual welding and be bonded together.In the lit-par-lit structure 13 of this structure, in the first face 10a and the second face 10b both sides, with identical Pattern be formed with interlayer weld portion 16, be only formed in first layer in addition, being also formed on the first face 10a with defined pattern Weld portion 17 between 11 fiber.In addition, the density ratio peripheral portion of small thickness weld portion is high.

Between interlayer weld portion 16 and fiber weld portion 17 be the part composition fiber be compacted in a thickness direction and At compacting portion when, the compacting is typically via with promotions composition fiber, that is, thermoplastic fibre melting such as heat, ultrasonic wave The embossing processing of promotion method is melted to implement, specifically, such as by implementing heat-sealing processing, ultrasonic sealing function.When When being conceived to manufacturing method in this way, then weld portion 17 can also be referred to as embossed portion or pressing part between interlayer weld portion 16 and fiber Deng.

Stacking non-woven fabrics 10 in, interlayer weld portion 16 by by the precursor of lit-par-lit structure 13 (as substrate non-woven fabrics The laminated body of the deposit of first layer 11 and hydrophobic fibre 15) it presses and is formed from the second face side 10b to the first face side 10a, Due to this forming method, as shown in Figure 1, it is in a concave shape to be recessed from the second face side 10b to the first face side 10a.In addition, being melted between fiber Socket part 17 by by the precursor (web of the deposit as hydrophilic fibre 14) of first layer 11 from the first face side 10a to The two faces side 10b press and are formed, due to this forming method, as shown in Figure 1, being recessed from the first face side 10a to the second face side 10b It is in a concave shape.In stacking non-woven fabrics 10, interlayer weld portion 16 is dispersed with multiple, fibre respectively in the first face 10a and the second face 10b Weld portion 17 is dispersed with multiple in the first face 10a between dimension.In stacking non-woven fabrics 10, the first face 10a and the second face 10b are not Do not have concave-convex flat surface substantially, but has indent and convex male and fomale(M&F).

In this way, when one or both in the first face 10a and the second face 10b that non-woven fabrics 10 is laminated has concave-convex, example Such as, component parts of the stacking non-woven fabrics 10 as can contact with the skin of wearer in absorbent commodity is being used (such as just Dough sheet, absorbing sweat piece) in the case where, because configuring stacking non-woven fabrics in such a way that its male and fomale(M&F) is contacted with the skin of wearer 10, space is formed between stacking non-woven fabrics 10 and the skin of wearer, is generated by body fluid such as the sweat excreted or urine wet Gas can be effectively dissipated away by the space, so the dry tack free sense of stacking non-woven fabrics 10 improves, absorbability can be improved The wearing feeling of article.

Fig. 2 illustrates the pattern (plan view shape and configuration) for having interlayer weld portion 16.In addition, in the first face 10a or the second face In 10b, the pattern of interlayer weld portion 16 is not limited to pattern shown in Fig. 2, without departing from the scope of the subject in the invention, can adopt With desired pattern.

Interlayer weld portion 16 when (a) of Fig. 2~Fig. 2 (c) is vertical view respectively for regulation shape is in face direction (with stacking The orthogonal direction of the thickness direction of non-woven fabrics 10) on be dispersed with it is multiple made of pattern.The plan view shape of interlayer weld portion 16 exists It is oval (oblong shape) in (a) of Fig. 2, is circular shape in Fig. 2 (b), is quadrangle or water chestnut in (c) of Fig. 2 Shape shape.In addition, (d) of Fig. 2 is configured for linear interlayer weld portion 16 by such a way that prescribed direction extends when overlooking Pattern, more specifically, the interlayer weld portion 16 of multiple continuous linear shapes are configured in a manner of cross one another, and molten as interlayer The entirety of socket part 16 forms the pattern of clathrate.

Fig. 3 illustrates the pattern of weld portion 17 between having fiber.In addition, in the first face 10a, the pattern of weld portion 17 between fiber It is not limited to pattern shown in Fig. 3, without departing from the scope of the subject in the invention, desired pattern can be used.

(a) of Fig. 3~Fig. 3 (e) is that weld portion 17 is divided in the surface direction between the fiber of regulation shape when overlooking respectively Dissipate have it is multiple made of pattern.The plan view shape of weld portion 17 is ellipse in (a) of Fig. 3 and (b) of Fig. 3 between fiber, (c) of Fig. 3 is circular shape, is quadrangle or diamond shape in (d) of Fig. 3, is crosswise in (e) of Fig. 3.In Fig. 3 (a) in, the long axis direction of weld portion 17 is consistent with each other between elliptical multiple fibers when vertical view, in contrast, in Fig. 3 (b) in, be dispersed with weld portion 17 between the different elliptical fiber of a variety of vertical views of long axis direction.Such as (a)~Fig. 3 of Fig. 3 (e) shown in, in the pattern of dispersed, as the plan view shape of weld portion 17 between fiber, in addition to the shape of diagram, such as Triangle, polygonal shape more than pentagon, star shape can also be enumerated.In addition, (h) of (f) of Fig. 3~Fig. 3 is respectively When vertical view between linear fiber weld portion 17 by the pattern made of being configured in a manner of prescribed direction extends.In Fig. 3 (f), Weld portion 17 is configured in a manner of cross one another between the fiber of multiple continuous linear shapes, whole as weld portion 17 between fiber, shape At the pattern of clathrate.(g) of Fig. 3 is by weld portion 17 between fiber in the lattice-shaped pattern of Fig. 3 (f) from continuous linear shape It is changed to the pattern of discontinuous threadiness, is to use intermittently to configure weld portion 17 between the fiber of shorter line segment defined The pattern of discontinuous line (dashed line) made of on one direction.(h) of Fig. 3 is by the fiber of the discontinuous threadiness of Fig. 3 (g) Between weld portion 17 formed pattern another example, be that weld portion 17 between the fiber is configured to pattern made of honeycomb.

Fig. 4 illustrates have the face for being formed with 17 both sides of weld portion between interlayer weld portion 16 and fiber that non-woven fabrics 10 is laminated the The pattern of two weld portions 16,17 in 10a on one side.In addition, the pattern of two weld portions 16,17 is not limited in the first face 10a Desired pattern can be used without departing from the scope of the subject in the invention in pattern shown in Fig. 4.

(a) of Fig. 4 is the fibre of the pattern of the dispersed of the interlayer weld portion 16 of Fig. 2 (a) and the dispersed of (a) of Fig. 3 The combination of the pattern of weld portion 17 between dimension, (b) of Fig. 4 are the pattern and Fig. 3 of the interlayer weld portion 16 of the dispersed of Fig. 2 (b) (h) linear fiber between weld portion 17 pattern combination, (c) of Fig. 4 is the linear interlayer weld portion of Fig. 2 (d) The combination of the pattern of weld portion 17 between the fiber of the dispersed of (c) of 16 pattern and Fig. 3, (d) of Fig. 4 are points of Fig. 2 (c) The combination of the pattern of weld portion 17 between the fiber of the dispersed of (d) of the pattern and Fig. 3 of the interlayer weld portion 16 of bulk.

Non-woven fabrics 10 is laminated in addition to above-mentioned characteristic, also with the feature of following this respect, that is, by phase Weld portion 17 between the interlayer weld portion 16 in the face for the first face 10a and the second respective area of face 10b and fiber Total area ratio be known as the weld portion the area ratio in respective face in the case where, i.e., by the face relative to the first face 10a The ratio of total area of weld portion 17 is known as the first face between the interlayer weld portion 16 and fiber of first face 10a for product The weld portion the area ratio of 10a, in addition by the interlayer weld portion 16 of second face 10b for the area of the second face 10b In the case that the ratio of total area of weld portion 17 is known as the weld portion the area ratio of the second face 10b between fiber, the first face 10a Compared with the second face 10b, bigger (the weld portion face of weld portion the area ratio > the second face 10b of the first face 10a of weld portion the area ratio This size relation of product rate is set up).

In stacking non-woven fabrics 10 as characterized above, the second face 10b because formed the face the second layer 12 be containing The hydrophobic layer of hydrophobic fibre 15, so being substantially difficult to absorb the face of the body fluid such as sweat or urine (aqueous solution), but with regard to second For interlayer weld portion 16 and its surrounding in the 10b of face, not only there are hydrophobic fibres 15, also compare densely there are with The second layer 12 is adjacent and the hydrophilic fibre 14 of the higher layer, that is, first layer 11 of water-wetness, so water-wetness is than in the second face 10b Other positions it is all high (contact angle measured in aforementioned manners is small), therefore, in the second face 10b, body fluid can be preferentially attached to Interlayer weld portion 16 and its surrounding.In addition, as described above, lit-par-lit structure 13 on thickness direction Z because have " the first face 10a Side water-wetness compared with the second face side 10b is relatively high " this water-wetness gradient, so stacking non-woven fabrics 10 has from the second face The excellent capillary force of the liquid-absorbent of 10b to the inside of thickness direction Z.Therefore, the interlayer weld portion 16 in the second face 10b And its body fluid accompanying by surrounding mainly via the peripheral part of interlayer weld portion 16 and its near, by promptly introduce stacking nonwoven The inside of cloth 10, in addition, hydrophilic first layer 11 is because have, " water-wetness of the first face side 10a is relatively low, the second face The water-wetness of the side 10b is relatively high " this water-wetness gradient, so in the face direction along stacking non-woven fabrics 10 (with thickness direction Z Orthogonal direction) diffusion while, the inside of thickness direction Z by hydrophilic first layer 11 absorb keep.In the second face 10b In, become liquid introducing portion mainly " peripheral part of interlayer weld portion 16 and its near ".Even if in general, interlayer weld portion 16 The fibre morphology of the composition fiber of the center portion thereof is lost and membranization, part, that is, interlayer other than the central part of interlayer weld portion 16 The peripheral part of weld portion 16 and its nearby (around interlayer weld portion 16) will not membranization, but maintain fibre morphology, so The peripheral part of interlayer weld portion 16 and its liquid introducing portion for nearby becoming the second face 10b.

From the viewpoint of from the further increasing of the liquid-absorbent realized by above-mentioned water-wetness gradient, the second layer 12 The contact angle of fiber (hydrophobic fibre 15) is constituted premised on the composition fiber (hydrophilic fibre 14) than first layer 11 is big, it is excellent Be selected as 95 degree or more, further preferably 100 degree or more, also, it is preferred that be 150 degree hereinafter, further preferably 130 degree with Under.In addition, the contact angle of the composition fiber (hydrophilic fibre 14) of first layer 11 is with the composition fiber (hydrophobicity than the second layer 12 Fiber 15) it is small premised on, preferably 15 degree or more, further preferably 20 degree or more, also, it is preferred that for 88 degree hereinafter, into one Preferably 85 degree or less of step.The water-wetness for constituting fiber can be i.e. hot by suitably adjusting the main composition fiber of stacking non-woven fabrics 10 Type, content of the degree of the hydrophilicity-imparting treatment of Plasitc fibers such as hydrophilic agent etc. are adjusted.

In addition, as described above, interlayer weld portion 16 is its week in the case where absorbing liquid from hydrophobicity the second face 10b Edge and its significant points for nearby becoming liquid introducing portion, but in interlayer weld portion 16, due to the hydrophobic second layer 12 With hydrophilic first layer 11 engage, stacking non-woven fabrics 10 after imbibition in the compressed situation of thickness direction (for example, Stacking non-woven fabrics 10 is make the second face 10b as the component parts of absorbent commodity towards in a manner of the skin side of wearer Used time, in the case where being applied with the body pressure of wearer to the stacking non-woven fabrics 10), it is possible to occur to be absorbed by first layer 11 and protect Peripheral part and its so-called liquid reflux neighbouring and that flow back into second face 10b side of the liquid held via interlayer weld portion 16. But because it is formed with the composition fiber (hydrophilic fibre of only first layer 11 seperatedly with interlayer weld portion 16 in first layer 11 14) weld portion 17 mutually between fiber made of welding, and by weld portion 17 between the fiber, liquid is close along surrounding fiber The part of collection is spread in the surface direction, so the liquid reflux to the second face side 10b can be effectively inhibited.

Come from the viewpoint for more reliably realizing above-mentioned function and effect (get both liquid-absorbent and the reflow the two of liquidproof) It sees, the ratio of the weld portion the area ratio (the latter) of the weld portion the area ratio (the former) of the first face 10a and the second face 10b is (that is, first Ratio of the weld portion the area ratio of face 10a relative to the weld portion the area ratio of the second face 10b) with the former/the latter indicate when it is preferred It is 1.3 or more, further preferably 1.4 or more, also, it is preferred that for 3.0 hereinafter, further preferably 2.5 or less.When this ratio When rate is too small, it is reflow to be difficult to obtain liquidproof, on the contrary, when excessive, the absorbable liquid measure kept of hydrophilic first layer 11 It is possible that can reduce.

When being formed with 17 both sides of weld portion between interlayer weld portion 16 and fiber on the first face 10a, two weld portions 16,17 Pattern can also be same to each other, but from the viewpoint of more reliably realizing above-mentioned function and effect, the preferred figure of two weld portion 16,17 Case is different.More specifically, 17 preferred disposition pattern of weld portion between interlayer weld portion 16 and fiber, single weld portion are bowed Depending on distance between shape, the area of single weld portion, weld portion (shortest distance of weld portion to each other) D16, D17 (referring to Fig.1), At least two in pitch P16, P17 (referring to Fig.1) are different.Here, distance D16, D17 refers in stacking non-woven fabrics between weld portion Two adjacent weld portions (weld portion 17 between interlayer weld portion 16 or fiber) mutual interval on 10 face direction, pitch P16, The distance between center when P17 refers to two weld portions respective vertical view.

Weld portion 17 is all density ratio peripheral portion height and constitutes fiber welding each other between interlayer weld portion 16 and fiber Made of high density molten portion, the fiber according to the pressurized, heated condition etc. when being formed, as the thermoplastic fibre for constituting fiber Form is possible to lose and membranization, but from the viewpoint of more reliably realizing above-mentioned function and effect, between fiber weld portion 17 with Interlayer weld portion 16 is compared, and the fibre morphology for constituting fiber is preferably maintained.Specifically, for example, relative to interlayer weld portion 16 Composition fibrous coat for, the composition fiber of weld portion 17 preferably maintains fibre morphology without by membranization between fiber.Pass through Relatively maintain fiber between weld portion 17 composition fiber fibre morphology, maintain its fibre morphology fiber between weld portion 17 In, since hydrophilic fibre 14 exists to high-density, capillary pressure is high, therefore, weld portion 17 and surrounding guarantor between fiber Fluidity can further improve.In addition, relatively lost by the fibre morphology of the composition fiber of interlayer weld portion 16, it can be effective Prevent the liquid reflux via the interlayer weld portion 16 for losing its fibre morphology.The fiber of the composition fiber of weld portion 16,17 Form is mainly by the conditional decision of embossing processing when forming weld portion 16,17, heating pressurized conditions when making embossing processing When weaker, it is easy the fibre morphology for maintaining to constitute fiber.

As described above, because interlayer weld portion 16 peripheral part and its nearby from the second face 10b absorb liquid the case where Under, it is the position as liquid introducing portion, so from the viewpoint of the liquid-absorbent for improving stacking non-woven fabrics 10, the second face 10b preferably has the interlayer weld portion dispersion configuring area for being dispersed with multiple interlayer weld portions 16 in the surface direction.Especially exist Stacking non-woven fabrics 10 as can absorbing sweat absorbing sweat piece carry out use in the case where, when the second face 10b is with above-mentioned interlayer weld When dissipating configuring area, the absorbability of sweat can further improve, it is advantageous to.Can be the second face 10b whole region be all on Interlayer weld portion dispersion configuring area is stated, a part for being also possible to only the second face 10b is that above-mentioned interlayer weld portion is distributed Region.The ratio that the area of above-mentioned interlayer weld portion dispersion configuring area is shared in the gross area of the second face 10b is preferably 70% or more, further preferably 80% or more.

In addition, the configuration about the interlayer weld portion 16 in above-mentioned interlayer weld portion dispersion configuring area, in the second face 10b Above-mentioned interlayer weld portion dispersion configuring area any position be hypothetically equipped with the circle of radius 2mm in the case where, preferably at it Part or all of 1 interlayer weld portion 16 is included at least in imaginary circle.Here, " it is hypothetically equipped with radius at an arbitrary position In the case where the circle of 2mm, part or all of 1 interlayer weld portion 16 is included at least in its imaginary circle " be meant that, " in the case where being equipped with 10 above-mentioned imaginary circles in the above-mentioned interlayer weld portion of the second face 10b dispersion configuring area, at its 10 In 1 or 2 above-mentioned imaginary circles in, interlayer weld portion 16 can also not included completely, as long as in remaining 8 above-mentioned imaginary circle In, part or all including at least 1 interlayer weld portion 16 " this meaning.Above-mentioned imaginary circle is to imagine to be dispersed in The circle at the hidropoiesis position (sweat gland) of the skin surface of human body has above structure by stacking non-woven fabrics 10, can be more efficiently Absorbing sweat.Especially in the case where the radius of above-mentioned imaginary circle is 1.5mm, the side of above-mentioned condition is met when interlayer weld portion 16 When formula configures, more effectively.

Because the peripheral part of interlayer weld portion 16 and its be nearby the second face 10b liquid introducing portion, in order to ensure Practical enough liquid-absorbents, need a degree of quantity, that is, the perimeter of interlayer weld portion 16 needs to have certain journey Degree or more length, but the area of not preferred interlayer weld portion 16 itself is excessive, when excessively there is interlayer on the second face 10b When weld portion 16, in interlayer weld portion 16, the not only hydrophobic second layer 12, even hydrophilic first layer 11 also together by Welding, so the liquid measure that first layer 11 can absorb holding is possible to reduce.From the point of view of this viewpoint, interlayer weld portion 16 The gross area (in the case where being formed with multiple interlayer weld portion 16 on the second face 10b, the area of multiple interlayer weld portions 16 It is total) relative to the second face 10b area ratio, that is, the area ratio of interlayer weld portion 16 is preferably 15% hereinafter, further Preferably 12% or less.In addition, the lower limit of this ratio is preferably 5% or more, further preferably 6% or more.

In addition, because interlayer weld portion 16 throughout the thickness direction Z of lit-par-lit structure 13 (stacking non-woven fabrics 10) entirety and Continuously, and in the first face 10a and the second face 10b, the pattern (plan view shape and configuration) of interlayer weld portion 16 is substantially the same, institute With the explanation related with the pattern of interlayer weld portion 16 of the second face 10b in this specification, (above-mentioned interlayer weld portion dispersion is matched Set region, the area ratio of interlayer weld portion 16 etc.) as long as no special declaration, it is also applied for the first face 10a.

Weld portion 17 is short between the preferred pitch ratio fiber of interlayer weld portion 16.That is, referring to Fig.1, preferably " interlayer weld portion 16 The size relation of the pitch P17 " of weld portion 17 is set up between pitch P16 < fiber.By this structure because from start perspire and Amount of sweat can absorb at the time of less, and the absorptive capacity of first layer 11 is big, so above-mentioned effect effect can be realized more reliably Fruit (get both liquid-absorbent and the reflow the two of liquidproof).

In addition, from the viewpoint of same, (weld portion to each other most short of distance between the preferred weld portion of interlayer weld portion 16 Distance) it is shorter than weld portion 17 between fiber.That is, referring to Fig.1, preferably " between the weld portion of interlayer weld portion 16 between distance D16 < fiber The size relation of distance D17 " is set up between the weld portion of weld portion 17.In addition, the related structure of distance exists between this weld portion It is to be configured between multiple interlayer weld portions 16 and fiber in the case where pattern made of weld portion 17 to dispersed when overlooking respectively, example Such as interlayer weld portion 16, in the case where the pattern shown in (a) for Fig. 2~Fig. 2 (c) especially effectively, for Between fiber for weld portion 17, in the case where the pattern shown in (a) for Fig. 3~Fig. 3 (e) especially effectively.

In addition, equally from the viewpoint of get both liquid-absorbent and the reflow the two of liquidproof, 1 interlayer weld portion 16 It is 0.3mm in the area of the second face 10b²Hereinafter, it is preferred that area of the weld portion 17 in the first face 10a is small between than 1 fiber.Interlayer Area of the weld portion 16 in the second face 10b is preferably 0.25mm²Hereinafter, in addition, about lower limit, preferably 0.1mm²More than, into one Step is preferably 0.15mm²More than.In addition, 1 interlayer weld portion 16 melts between the area (the former) and 1 fiber of the second face 10b Socket part 17 the area (the latter) of the first face 10a ratio (that is, 1 interlayer weld portion 16 the second face 10b area relative to Ratio of the weld portion 17 in the area of the first face 10a between 1 fiber) with the former/the latter indicate when preferably 0.25 or more, into one Step preferably 0.3 or more, also, it is preferred that for 0.8 hereinafter, further preferably 0.75 or less.In addition, this structure is being respectively It is configured to dispersed between multiple interlayer weld portions 16 and fiber in the case where pattern made of weld portion 17 when vertical view, such as For interlayer weld portion 16, in the case where the pattern shown in (a) for Fig. 2~Fig. 2 (c) especially effectively, between fiber For weld portion 17, in the case where the pattern shown in (a) for Fig. 3~Fig. 3 (e) especially effectively.

The grammes per square metre of first layer 11 and the second layer 12 is not particularly limited, as long as appropriate according to the purposes of stacking non-woven fabrics 10 etc. Adjusting.For example, the component parts in stacking non-woven fabrics 10 as absorbent commodities such as disposable diaper, sanitary napkins (positive dough sheet, absorbing sweat piece etc.) and in the case where use, from not only ensure practical enough intensity but also do not make volume increase viewpoint From the point of view of, the grammes per square metre of first layer 11 and the second layer 12 altogether is preferably 8g/m²More than, further preferably 10g/m²More than, and Preferably 30g/m²Hereinafter, further preferably 27g/m²Below.

Especially in the side that the liquid for being set as being absorbed by the hydrophobic second layer 12 (the second face 10b) initially contacts In the case of, hydrophilic first layer 11 be with the peripheral part of the interlayer weld portion 16 of the second face 10b of the second layer 12 and its near The relevant layer of liquid absorption force, in general, the grammes per square metre of first layer 11 is more, the absorbability is higher, in addition, intensity is also higher.And When the grammes per square metre of first layer 11 is excessive, volume increase or rigidity will be caused to increase, as a result, as absorbent commodity Component parts and in the case where use, it is possible to incur wearing feeling decline.When considering above situation, the grammes per square metre of first layer 11 is excellent It is selected as 5g/m²More than, further preferably 7g/m²More than, also, it is preferred that being 25g/m²Hereinafter, further preferably 20g/m²With Under.

In addition, the hydrophobic second layer 12 is usually to become most in the case where non-woven fabrics 10 will be laminated and be used for imbibition purposes The layer of the side just contacted with liquid when and thickness fewer in the grammes per square metre of the second layer 12 is thin, is easy in this usage mode Via the interlayer weld portion 16 of the second face 10b peripheral part and its nearby absorb liquid.And when the grammes per square metre of the second layer 12 is very few, It is possible that there is intensity decline, liquid reflux.When considering above situation, the grammes per square metre of the second layer 12 is preferably 3g/m²More than, into one Step is preferably 5g/m²More than, also, it is preferred that being 15g/m²Hereinafter, further preferably 13g/m²Below.In addition, working as the second layer 12 For 3g/m²When the low grammes per square metre of left and right, it is possible to which the intensity deficiency for the second layer 12 occur becomes seriously, the manufacture of non-woven fabrics 10 to be laminated Become difficult, but according to the manufacturing method of aftermentioned stacking non-woven fabrics of the invention, due to the second layer 12 by it is so-called directly Spin processes manufacture, therefore can eliminate this possibility.

As described above, various non-woven fabrics can be used, but using stacking non-woven fabrics 10 as first layer 11 and the second layer 12 For in the case where imbibition purposes when component parts as absorbent commodity etc., from more reliably realizing above-mentioned function and effect From the point of view of viewpoint, as hydrophilic first layer 11, particularly preferably it is coated with the spun-bonded non-woven fabrics of hydrophilic agent or is coated with parent The SMS non-woven fabrics of hydrated agent.

In addition, preferred another example as hydrophilic first layer 11, can enumerate containing 70 mass % or more, preferably 75 The hot-wind nonwoven cloth of the hydrophilic fibre 14 of quality % or more, and the welding between the hot-wind nonwoven cloth is all formed with fiber on the whole The non-woven fabrics in portion 17.In this hot-wind nonwoven cloth, the area of weld portion 17 is preferably 0.2mm between 1 fiber²More than, into one Step is preferably 0.3mm²More than, also, it is preferred that being 1mm²Hereinafter, further preferably 0.8mm²Below.In addition, in this hot wind In one face of non-woven fabrics, between fiber present on the unit area of every 10mm square the quantity of weld portion 17 be preferably 4 with On, further preferably 6 or more, also, it is preferred that for 30 hereinafter, further preferably 28 or less.

On the other hand, as the hydrophobic second layer 12, consider that thickness is smaller and is easier to absorb liquid, therefore excellent It is selected as spun-bonded non-woven fabrics, melt spraying non-woven fabrics or their stacking non-woven fabrics (such as SMS non-woven fabrics).

Main composition fiber, that is, hydrophilic fibre 14 of first layer 11 is typically to originally fine for hydrophobic thermoplasticity Dimension is implemented obtained from hydrophilicity-imparting treatment.That is, first layer 11 can be described as to hydrophobic fibre (for example, can be used as the second layer 12 Composition fiber come using thermoplastic fibre) aggregate implement the layer of hydrophilicity-imparting treatment.As the hydrophilicity-imparting treatment, such as It is upper described, in addition to being coated with hydrophilic agent to fiber or fiber assembly, mixing hydrophilic agent to fiber, it is possible to use plasma Body processing etc., but handled usually using hydrophilic agent.

As an example of first layer 11, can enumerate the second face side 10b be coated with hydrophilic agent (the second face side 10b Constitute fiber surface be attached with hydrophilic agent) form.The second face side 10b of first layer 11 is opposite with the first face 10a Side, and be the layer adjacent with the first layer 11 i.e. water-wetness layer lower than first layer 11 (in form shown in Fig. 1, to be hydrophobic The second layer 12 of property) contact surface side.In the first layer 11 of this form, because being attached to structure compared with the first face side 10a At the hydrophilic agent on surface of fiber, more bias is in the second face side 10b, so the first layer 11 has the first face side 10a Water-wetness is relatively low, the second face side the 10b relatively high this water-wetness gradient of water-wetness.In this way, in first layer 11, because For following this water-wetness when the water-wetness of the second face side 10b is higher than the first face side 10a, will be formed in lit-par-lit structure 13 Gradient, that is, water-wetness is with from the hydrophobic second layer 12 (the second face 10b) initially contacted with the liquid to be absorbed to stacking It goes periodically to increase (contact angle measured in aforementioned manners periodically reduces), institute on the inside of the thickness direction Z of construction 13 Can expect further increasing for liquid-absorbent.

The coating method of hydrophilic agent is not particularly limited, and suitably utilization can be coated with the coating fluid containing hydrophilic agent Well known method.As available coating method, preferably intaglio plate coating, roller lick coating, flexible version printing, spraying, inverse To coating, die coating, wherein particularly preferably can be with intaglio plate coating that pattern is coated, flexographic plate coating, spraying, die coating.Separately Outside, as hydrophilic agent, in the absorbent commodities such as disposable diaper, the parent in component parts can be used without particular limitation Various surfactants etc. used in aquation.

As another example of first layer 11, the hydrophilic non-woven containing the composition fiber for having mixed hydrophilic agent can be enumerated. In the first layer 11 of this form, hydrophilic agent is not attached to its main composition fiber i.e. surface of hydrophilic fibre 14, But it is contained in hydrophilic fibre 14.The first layer 11 of the above-mentioned form that hydrophilic agent is coated with from a surface side is in thickness side There is water-wetness gradient on Z, in contrast, the first layer 11 in constituting fiber mixed with the form of hydrophilic agent is constituted with it Fiber is distributed evenly in premised on 11 entirety of first layer, does not have water-wetness gradient on thickness direction Z, but water-wetness is equal It is even.

In addition, the liquid-absorbent of stacking non-woven fabrics 10 is not only by the shadow of the water-wetness gradient on above-mentioned thickness direction It rings, and is much influenced by the thickness of the hydrophobic second layer 12.Distance is small in hydrophobic nonwoven, between fiber and thickness It is mostly the raised factor of water resistance.Therefore, it is set as and the liquid to be absorbed by the hydrophobic second layer 12 (the second face 10b) In the case where the layer (layer inserted the liquid into) initially contacted, in order to improve the liquid-absorbent of stacking non-woven fabrics 10, preferably the Two layer 12 of thickness is small and fibre density is low (distance between fiber).On the other hand, the hydrophilic layer adjacent with this is (in diagram It is first layer 11 in form) because capillary force is high, it can absorb water via hydrophobic layer, it is advantageous to the high (fibers of fibre density Between distance it is short).Interlayer weld portion 16 and its around, the hydrophily of the first layer 11 of fibre density height (distance is short between fiber) is fine Dimension is easy to be exposed to the second face between the fiber of the second layer 12 (the second face 10b) of fibre density relatively low (distance between fiber) The side 10b is understood in more stably promptly introducing from the peripheral part of the interlayer weld portion 16 of the second face 10b and its nearby by liquid Portion, and the liquid absorption being introduced into is maintained in hydrophilic first layer 11.From the point of view of this viewpoint, first layer 11 is preferred fine It is high to tie up the density ratio second layer 12, that is, distance is short between preferably comprising the fiber of fiber.Distance is surveyed by following methods between fiber It is fixed.

The measuring method > of distance between < fiber

The following formula (1) that distance passes through the hypothesis based on Wrotnowski between the fiber of the fiber assemblies such as non-woven fabrics, paper To find out.Following formula (1) usually between the fiber for seeking fiber assembly apart from when use.It is fine under the hypothesis of Wrotnowski It is cylindric for tieing up, and each fiber is non-intersecting, and arranges in an orderly manner.

It is monolayer constructions at measure object piece (the first hydrophilic layer 11A, the second hydrophilic layer 11B, hydrophobic layer 12) In the case of, distance is found out with following formula (1) between the fiber of the piece of monolayer constructions.

Measure object piece (the first hydrophilic layer 11A, the second hydrophilic layer 11B, hydrophobic layer 12) such as SMS non-woven fabrics that In the case that sample is multi-ply construction, distance is found out according to the following steps between the fiber of the piece of multi-ply construction.

Firstly, calculating distance between the fiber for constituting each fibrous layer of multi-ply construction using following formula (1).At this point, following Thickness t used in formula (1), grammes per square metre W, the resin density ρ of fiber and fibre diameter D use respectively measure object layer thickness t, The resin density ρ and fibre diameter D of grammes per square metre W, fiber.Thickness t, grammes per square metre W and fibre diameter D are the measurement of multiple measuring points respectively The average value of value.

Thickness t (mm) is measured by the following method.Firstly, measure object piece is cut into length direction 50mm × width side To 50mm, the cut off machine of the piece is made.But the size cannot be made in the breadload from lesser absorbent commodity etc. In the case that cut off machine is as measure object piece, cut off machine as big as possible is made.Then, which is placed on plate On, flat glass plate is placed on it, equably places weight on a glass, so as to include the load including glass plate After reaching 49Pa, the thickness of the cut off machine is measured.Determination of the environment is 20 ± 2 DEG C of temperature, relative humidity 65 ± 5%, analyzer Device uses microscope (Co., Ltd.'s Keyence system, VHX-1000).The measurement of the thickness of cut off machine first has to obtain the cutting The enlarged photograph of the section of piece.In the enlarged photograph, while shooting has the object of known dimensions.Then, make scale bar with The enlarged photograph of the section of above-mentioned cut off machine is aligned, and measures the thickness i.e. thickness of measure object piece of the cut off machine.Carry out with On operation 3 times, using 3 average value as the thickness t of measure object piece.In addition, the case where measure object piece is stacking product Under, according to fibre diameter, judges its boundary, calculate thickness.

Grammes per square metre W (g/m²) by the way that measure object piece is cut into defined size (such as 12cm × 6cm etc.), in quality measurement Afterwards, its mass determinations is found out into (" grammes per square metre W (g/m divided by the area found out according to the prescribed level²)=quality ÷ according to The area that prescribed level is found out ").Measurement 4 times, using its average value as grammes per square metre.

Resin density ρ (the g/cm of fiber³) density gradient column is used, based on the dimension test of JIS L1015 man-made staple fibres To measure, (URL is recorded in http://kikakurui.com/l/ to the measuring method of density gradient method documented by method L1015-2010-01.html is then recorded in JIS handbook, fiber -2000, (Japanese Standards Association) if it is books P.764~765).

Fibre diameter D (μm) is surveyed using Hitachi Ltd. S-4000 type field emission scanning electron microscope The fibre section of fixed 10 fibers cut out, using its average value as fibre diameter.The measuring method of fibre diameter D is according to aftermentioned < fibre diameter measuring method >.

Then, distance is shared in the thickness of multi-ply construction entirety multiplied by the thickness of this layer between the fiber by making each layer Ratio, and then the numerical value of each layer obtained in this way is combined togather, the composition for finding out the piece of multi-ply construction as a purpose is fine Distance between the fiber of dimension.For example, in the SMS non-woven fabrics for 3 layers of construction being made of 2 layers of S layer and 1 layer of M layer, by 2 layers of S Layer, which is put together as 1 layer, to be handled, and is 0.1mm, S layers in the thickness t that 3 layers of whole thickness t of construction are 0.11mm, S layers Fiber between in the case that distance LS is 3.2 μm between distance LS is 47.8 μm, M layers of thickness t is 0.01mm, M layers fiber, this Distance becomes 43.8 μm (=(47.9 × 0.1+3.2 × 0.01)/0.11) between the fiber of the composition fiber of kind SMS non-woven fabrics.

As described above, between the fiber of the composition fiber (hydrophilic fibre 14) of first layer 11 distance and the second layer 12 composition The ratio of distance is premised on the former < the latter between the fiber of fiber (hydrophobic fibre 15), as the latter/the former, preferably 1.1 or more, further preferably 10 or more, also, it is preferred that for 70 hereinafter, further preferably 50 or less.

Distance is preferably 5 μm or more between the fiber of the composition fiber (hydrophilic fibre 14) of first layer 11, further preferably It is 7 μm or more, also, it is preferred that for 100 μm hereinafter, further preferably 80 μm or less.

Distance is preferably 7 μm or more between the fiber of the composition fiber (hydrophobic fibre 15) of the second layer 12, further preferably It is 10 μm or more, also, it is preferred that for 200 μm hereinafter, further preferably 150 μm or less.

In addition, from by above-mentioned fibre density, from the second layer 12 to first layer 11, (the thickness direction Z's of lit-par-lit structure 13 is interior Side) the density gradient of removing to increase such fiber assign stacking non-woven fabrics 10 and from the viewpoint of improving liquid-absorbent, first The composition fiber (hydrophilic fibre 14) of layer 11 preferably fibre diameter is smaller than the composition fiber (hydrophobic fibre 15) of the second layer 12. Fibre diameter is measured by following methods.

The measuring method > of < fibre diameter

With razor (such as FEATHER shaves safely sword Co. Ltd. system blade), by measure object, (nonwoven is laminated in fibrous layer Cloth) cutting, it obtains overlooking the measurement piece for quadrangle form (8mm × 4mm).When cutting off the measure object, be careful not to because The construction of pressure when cutting etc. and the section for the measurement piece that destruction is formed by its cutting.As preferred measure object Cutting-off method can be enumerated before the cutting of measure object, and first measure object, which is put into liquid nitrogen, freezes it sufficiently, then again The method cut off.Using paper double faced adhesive tape (Nichiban Co. Ltd. system Nicetack NW-15), measurement piece is pasted On sample table.Next, measurement piece is coated platinum.Coating utilizes the ion sputtering of that jade-like stone precision instrument Co. Ltd. system of Hitachi Device E-1030 type (product name), sputtering time are set as 30 seconds.Use Hitachi Ltd.'s S-4000 type field Emit scanning electron microscope, with the section of 1000 times of Observe and measure pieces of multiplying power.

In addition, in the measuring method of above-mentioned fibre diameter, in the composition fiber (hydrophilic fibre of measurement first layer 11 14) in the case where, selection with the fiber that weld portion 17 is connected between fiber, measurement the second layer 12 composition fiber (hydrophobicity fibre In the case where tieing up 15), the composition fiber (hydrophobic fibre 15) of the second layer 12 Chong Die with weld portion 17 between fiber is selected, respectively The length of width direction of the measurement 10 for the length direction of fiber, using its average value as fibre diameter.

In addition, being in measure object is the multiple fibers different by fibre diameter as SMS non-woven fabrics, SMMS non-woven fabrics In the case where the compound nonwoven cloth that layer is constituted, the liquid-absorbent of first layer 11 is by fiber finer and the high meltblown layer of fibre density It is affected, in addition, fiber finer and fibre density high molten of the absorbability of the liquid from the second face side 10b by the second layer 12 Spray-up is affected.Consider above situation, in measure object is constituted and contained by the different multiple fibrous layers of fibre diameter In the case where the compound nonwoven cloth of meltblown layer, when measuring its fibre diameter, the fibre of the meltblown layer in the compound nonwoven cloth is measured Tie up diameter.

As described above, the fibre diameter (the former) and the second layer 12 of the composition fiber (hydrophilic fibre 14) of first layer 11 The ratio of the fibre diameter (the latter) of fiber (hydrophobic fibre 15) is constituted (that is, the composition fiber (hydrophilic fibre of first layer 11 14) ratio of the fibre diameter relative to the fibre diameter of the composition fiber (hydrophobic fibre 15) of the second layer 12) with the former < Premised on the latter, with the former/the latter indicate when, preferably 0.05 or more, further preferably 0.06 or more, also, it is preferred that being 0.9 hereinafter, further preferably 0.8 or less.

The fibre diameter of the composition fiber (hydrophilic fibre 14) of first layer 11 is preferably 0.5 μm or more, further preferably It is 1 μm or more, also, it is preferred that for 30 μm hereinafter, further preferably 20 μm or less.

The fibre diameter of the composition fiber (hydrophobic fibre 15) of the second layer 12 is preferably 3 μm or more, further preferably 5 μm or more, also, it is preferred that for 40 μm hereinafter, further preferably 30 μm or less.

In addition, from the viewpoint of the liquid-absorbent for improving stacking non-woven fabrics 10, the main composition fiber of first layer 11 That is main composition fiber, that is, hydrophobicity of the fibre weight (fiber count) of the preferred per unit area of hydrophilic fibre 14 than the second layer 12 More than fiber 15.The fibre weight of per unit area is measured by following methods

The measuring method > of the fibre weight of < per unit area

Firstly, non-woven fabrics 10 is laminated in measure object with razor in the same manner as the measuring method > of above-mentioned < fibre diameter It is cut off in a manner of the weld portion 17 between fiber, obtains measurement piece.Using scanning electron microscope, amplifying observation (is adjusted to The multiplying power of 30~60 or so fibre sections can be measured, is 150~500 times) section of measurement piece, it counts by every certain Area (0.5mm²Left and right) the section cutting fiber number of cross-sections.In the counting of the number of cross-sections of this fiber, surveying In the case where the composition fiber (hydrophilic fibre 14) for determining first layer 11, select and weld portion 17 is connected between fiber fiber.? In the case where the composition fiber (hydrophobic fibre 15) for measuring the second layer 12, the second layer Chong Die with weld portion 17 between fiber is selected 12 composition fiber (hydrophobic fibre 15).In addition, in the measurement of the composition fiber (hydrophilic fibre 14) of first layer 11, It is whole with the thickness direction between fiber near weld portion 17 in the case where being difficult to delimit the fiber that weld portion 17 is connected between fiber The number of cross-sections of fiber of certain area subtract the composition fiber of the Chong Die second layer 12 of the weld portion 17 between fiber (hydrophobicity be fine 15) the resulting value of number is that the composition fiber (hydrophilic fibre 14) of first layer 11 counts to dimension.Measurement will carry out at 3, be with average value The fibre weight.

As described above, the fibre weight (the former) and the second layer 12 of the per unit area of the hydrophilic fibre 14 of first layer 11 The ratio of the fibre weight (the latter) of the per unit area of hydrophobic fibre 15 is (that is, every list of the hydrophilic fibre 14 of first layer 11 Ratio of the fibre weight of plane product relative to the fibre weight of the per unit area of the hydrophobic fibre 15 of the second layer 12) with the former > Premised on the latter, with the former/the latter indicate when, preferably 1.8 or more, further preferably 2.0 or more, also, it is preferred that for 8 with Under, further preferably 6 or less.

The fibre weight (fiber count) of the per unit area of the hydrophilic fibre 14 of first layer 11 is preferably 10/mm²More than, Further preferably 15/mm²More than, also, it is preferred that being 300/mm²Hereinafter, further preferably 200/mm²Below.

The fibre weight (fiber count) of the per unit area of the hydrophobic fibre 15 of the second layer 12 is preferably 3/mm²More than, Further preferably 5/mm²More than, also, it is preferred that being 100/mm²Hereinafter, further preferably 70/mm²Below.

The lit-par-lit structure of stacking non-woven fabrics of the invention, which removes, has above-mentioned hydrophilic first containing hydrophilic fibre Other than layer and the hydrophobic second layer containing hydrophobic fibre, it is possible to have other layers.Specifically, for example in Fig. 1 institute In the stacking non-woven fabrics 10 shown, it can also be configured in the second face side 10b of the second layer 12 and contain long stapled long fibre layer. That is, stacking non-woven fabrics 10 is also possible to the long fibre layer comprising the first layer 11, the second face 10b of formation that form the first face 10a (not Diagram) and the second layer 12 between this two layers 3 layers or more of multi-ply construction.

The structure of above-mentioned long fibre layer is not particularly limited, but from improve the liquid from the second face side 10b absorbability From the viewpoint of, preferably hydrophilic layer, and the layer preferably based on hydrophilic fibre.As the main of above-mentioned long fibre layer Fiber, that is, hydrophilic fibre is constituted, it can be without particular limitation using hydrophilic fibre workable for first layer.As above-mentioned length An example of fibrous layer can illustrate the fibrous layer with hydrophilic layer, which contains the fiber for having mixed hydrophilic agent.It is above-mentioned long fine The grammes per square metre of dimension layer is not particularly limited, preferably 2g/m²More than, further preferably 3g/m²More than, also, it is preferred that being 10g/m² Hereinafter, further preferably 8g/m²Below.

The other embodiments of lit-par-lit structure as stacking non-woven fabrics of the invention, can enumerate stacking shown in Fig. 1 In non-woven fabrics 10, there are the forms of elastomeric element (not shown) between first layer 11 and the second layer 12.In lit-par-lit structure 13 In the case where 3 layers or more of multi-ply constructions, elastomeric element is not limited between first layer 11 and the second layer 12, can be between Any interlayer.In this way, can assign elasticity by making interlayer of the elastomeric element between lit-par-lit structure to stacking non-woven fabrics, be layered without The amplitude of the purposes of woven fabric can further expansion.

Above-mentioned elastomeric element preferably has following property (elasticity), that is, can extend, and extend from relative to raw footage When releasing power to 1.3 times of states (1.3 times of length for becoming raw footage), 1.1 times for being restored to raw footage are below Length.In addition, non-elastic component is the component without this " elasticity ", that is, be to have to be elongated to from relative to raw footage When 1.3 times of state (1.3 times of length for becoming raw footage) releases power, 1.1 times restored less than raw footage are below The component of the property of length.The form of above-mentioned elastomeric element is not particularly limited, may be selected threadiness, sheet, elastomer collection Any forms such as fit (elastic fibrous layers).Such as can enumerate, in stacking non-woven fabrics 10 (lit-par-lit structure 13) shown in Fig. 1, The elastomeric element of multiple threadiness (filiform) by mutually in same direction extension in a manner of configure first layer 11 and the second layer 12 it Between form, in this case, be laminated non-woven fabrics 10 (lit-par-lit structure 13) on the direction that elastomeric element extends have stretch Property.

As the raw material of above-mentioned elastomeric element, the resin material of natural rubber or thermoplastic elastomer (TPE) can be used, as The resin material of thermoplastic elastomer (TPE), such as SBS (s-B-S), SIS (styrene-isoamyl two can be enumerated Alkene-styrene), SEBS (styrene ethylene butadiene-styrene), the benzene such as SEPS (styrene ethylene-propylene-styrene) Ethylene based elastomers, olefin-based elastomer (the alpha-olefin elastomer of ethylene system, as Ethylene/Butylene-octene etc. copolymerization made of third Alkene based elastomers), polyester-based elastomer, polyurethane series elastomer.

Then, its preferred embodiment is based on to the manufacturing method of stacking non-woven fabrics of the invention and is carried out referring to attached drawing Explanation.Fig. 5 is an embodiment of the manufacturing method that non-woven fabrics is laminated as the present invention to indicate above-mentioned stacking non-woven fabrics 10 Manufacturing method an example synoptic diagram.As described above, stacking non-woven fabrics 10, which has, contains thermoplastic fibre (hydrophilic fibre 14, hydrophobic fibre 15) fibrous layer lit-par-lit structure 13, constitute each layer of the lit-par-lit structure 13 each other by molten using interlayer The mutual welding of socket part 16 and constitute.

As shown in figure 5, the manufacturing method of stacking non-woven fabrics 10 includes the process for obtaining laminated body 10P, hydrophily is conveyed Substrate non-woven fabrics 11P, it is fine to be carried out hydrophobicity obtained from spinning by accumulation for resin on the substrate non-woven fabrics 11P in its conveying Dimension 15, obtains laminated body 10P；With interlayer fusion bonding process, laminated body 10P is locally compressed and is heated in a thickness direction, Form interlayer weld portion 16.Substrate non-woven fabrics 11P has density ratio peripheral portion high and constitutes fiber (hydrophilic fibre 14) each other Weld portion 17 between fiber made of mutual welding, eventually becomes the stacking non-woven fabrics 10 as manufacturing purpose object of this manufacturing method First layer 11.

As shown in figure 5, firstly, the substrate non-woven fabrics 11P being rolled into a roll is rolled out, utilizing conveying in this manufacturing method Band 50, the direction shown in the symbol M D convey, the spinneret in its transmission process, from the top for being configured at conveyer belt 50 51 spinneret spins hydrophobic fibre 15, is deposited directly on it on substrate non-woven fabrics 11P, obtains laminated body 10P.Then, Continue to convey laminated body 10P, be fed between a pair of of knurling rolls 52,53, heat embossing processing, shape are implemented to laminated body 10P Weld portion 16 (interlayer fusion bonding process) between stratification.The top of laminated body 10P of the configuration of knurling rolls 52 in conveying, in heat embossing plus It in work, is contacted with the deposit (web) for the hydrophobic fibre 15 being directly spun into, knurling rolls 53 configure the stacking in conveying The lower section of body 10P contacts in heat embossing processing with substrate non-woven fabrics 11P.About with the laminated body 10P as machined object The outer peripheral surface of the outer peripheral surface of two rollers 52,53 of contact, knurling rolls 53 does not have bumps, in contrast, in the periphery of knurling rolls 52 On face, using pattern corresponding with the pattern of interlayer weld portion 16 in the stacking non-woven fabrics 10 as manufacturing purpose object, formed There is protrusion (not shown).Laminated body 10P is being heated to contained by it by the clamping part between two rollers 52,53 as this structure Thermoplastic fibre (hydrophilic fibre 14 and hydrophobic fibre 15) fusing point more than temperature in the state of through-thickness pressure Contracting, laminated body 10P is embossed the raised part of roller 52, from the deposit side of hydrophobic fibre 15 to the side substrate non-woven fabrics 11P office It compresses to portion, at it by compression unit formation interlayer weld portion 16.Pass through this interlayer fusion bonding process, the accumulation of hydrophobic fibre 15 Object becomes non-woven fabrics, and integrated with substrate non-woven fabrics 11P via interlayer weld portion 16.By the above process, obtain have by The layer of first layer 11 and the second layer 12 being made of the deposit (web) of hydrophobic fibre 15 that substrate non-woven fabrics 11P is constituted The stacking non-woven fabrics 10 of folded construction 13.In the stacking non-woven fabrics 10 obtained in this way, interlayer weld portion 16 from the second face side 10b to The first face side 10a recess is in a concave shape.

One of main feature as this manufacturing method can be enumerated by melt spinning method etc. that hydrophobic fibre 15 is direct It spins on hydrophilic substrate non-woven fabrics 11P and forms the web this point as its deposit.This using so-called straight In this manufacturing method for connecing spin processes, without proceeding as follows, i.e., do not obtained by melt spinning temporarily having been batched with winder After the long fibre arrived, the fiber as obtained from stretching or cutting (hydrophobic fibre 15) is deposited in substrate non-woven fabrics 11P On.

When manufacturing the stacking non-woven fabrics as stacking non-woven fabrics 10, by utilizing Direct Spinning as this manufacturing method Silk method, it can be achieved that gram of stacking non-woven fabrics compared with making multiple non-woven fabrics process integrated method by overlapping heat embossing The reduction of weight, the slimming of the hydrophobic second layer 12 especially formed by direct fabrics become easy.As described above, second Layer 12 because when in grammes per square metre, fewer and thickness is thin, be easy via the interlayer weld portion 16 in the second face 10b peripheral part and its Liquid nearby is absorbed, it is advantageous to.In addition, according to this manufacturing method, by making the be spun into direct heap of hydrophobic fibre 15 Product forms laminated body 10P on hydrophilic substrate non-woven fabrics 11P, therefore hydrophobic fibre 15 is easily accessible substrate non-woven fabrics In 11P, the adaptation of first layer 11 and the second layer 12 is increased, so as described above, by the interlayer weld portion in the second face 10b 16 and its surrounding be set as liquid introducing portion in the case where, can show higher liquid-absorbent, and then intensity is also strong, can be obtained The stacking non-woven fabrics 10 of high-quality.

In addition, comprising being laminated with multiple second layers 12 and the tool of lit-par-lit structure 13 haves three layers in stacking non-woven fabrics of the invention Above form, in the case where manufacturing the stacking non-woven fabrics of this form, in the process for obtaining laminated body 10P, as long as Hydrophobic fibre 15 is repeatedly accumulated on substrate non-woven fabrics 11P.In this case, such as manufacturing method shown in Fig. 1 In, as long as intermittently configuring multiple spinnerets 51 on conveying direction MD, hydrophobicity fibre is successively then spun from each spinneret 51 Dimension 15, is deposited directly on it on substrate non-woven fabrics 11P.

Substrate non-woven fabrics 11P can conventionally be manufactured according to the type of substrate non-woven fabrics 11P.Substrate nonwoven Cloth 11P is typically manufactured by following process: the fiber that accumulation obtains resin progress spinning, the process for obtaining web； The web is locally compressed and is heated in a thickness direction, forms weld portion 17 between fiber by the fusion bonding process between fiber. For example, manufacture is as described below in the case where substrate non-woven fabrics 11P (first layer 11) is spun-bonded non-woven fabrics.That is, first with crowded Machine etc. melts the resin combination of the raw material of non-woven fabrics out, sprays it from the spinneret of spinneret, spins long fibre.So Afterwards, using cooling fluid that spun long fibre is cooling, it recycles and stretches air to long fibre application tension, be made defined Fiber number directly traps in trapping belt, it is made to be piled into defined thickness.Long fibre is carried out next, processing using heat embossing Introduced details, formed fiber between weld portion 17.

Between above-mentioned fiber in fusion bonding process, above-mentioned web (tablet of welding between fiber is not usually subjected to.Substrate The precursor of non-woven fabrics 11P.) compress and heat in a thickness direction from one surface side, form weld portion 17 between fiber.Using this Kind has through the substrate non-woven fabrics 11P from weld portion 17 between the fiber that the compression of a surface side of web is formed, and as above It is (recessed in the compressing surface of substrate non-woven fabrics 11P in the case where manufacturing stacking non-woven fabrics 10 using so-called direct spinning describedly Fall into the forming face of weld portion 17 between fiber in a concave shape) hydrophobic fibre 15 is accumulated on the face of opposite side.In the layer obtained in this way In folded non-woven fabrics 10, weld portion 17 is recessed in a concave shape from the first face side 10a to the second face side 10b between fiber.

Substrate non-woven fabrics 11P becomes hydrophilic first layer 11 in the stacking non-woven fabrics 10 as manufacturing purpose object, until At the time of less before hydrophobic fibre 15 is directly accumulated, it is carried out hydrophilicity-imparting treatment.As described above, substrate non-woven fabrics 11P Hydrophilicity-imparting treatment can utilize to fiber or fiber assembly coating hydrophilic agent, into fiber mix hydrophilic agent, plasma Hydrophilicity-imparting treatment well known to body processing etc., typically with the incorporation of hydrophilic agent or the coating of hydrophilic agent.

For example, in the case where substrate non-woven fabrics 11P (first layer 11) is spun-bonded non-woven fabrics, in mixing by hydrophilic agent Enter carry out its hydrophilicity-imparting treatment when, by by thermoplastic resin add hydrophilic agent become as defined in concentration then into Row melting mixing and the thermoplastic resin of the raw material of hydrophilic agent masterbatch and non-woven fabrics produced are mixed with regulated proportion, so Its mixture is melted with extruder etc. afterwards, is sprayed from the spinneret of spinneret, is spun long fibre, then make its accumulation, obtain Web (precursor of substrate non-woven fabrics 11P).Long fibre spun in this way is hydrophilic fibre 14.

On the other hand, in the case where carrying out the hydrophilicity-imparting treatment of substrate non-woven fabrics 11P by the coating of hydrophilic agent, allusion quotation Type between being made of thermoplastic fibre (hydrophobic fibre) of being obtained by conventional method and with fiber weld portion 17 it is hydrophobic Hydrophilic agent is coated on property non-woven fabrics (precursor of substrate non-woven fabrics 11P).Hydrophiling is being imparted by coating using this The substrate non-woven fabrics 11P of agent, and as described above manufactured using so-called direct spinning stacking non-woven fabrics 10 in the case where, Hydrophobic fibre 15 is accumulated on the coated face of hydrophilic agent in substrate non-woven fabrics 11P.In the stacking non-woven fabrics 10 obtained in this way In, it is coated with hydrophilic agent in the second face side 10b of the first layer 11 being made of substrate non-woven fabrics 11P, therefore, as described above, The first layer 11 has the water-wetness of the first face side 10a relatively low, and the relatively high this parent of water-wetness of the second face side 10b Water degree gradient.That is, because in the stacking non-woven fabrics 10 (lit-par-lit structure 13) obtained in this way, water-wetness is formed with from hydrophobic The second layer 12 (the second face 10b) is to going and periodically raised water-wetness gradient on the inside of the thickness direction of lit-par-lit structure 13, institute Can expect further increasing for liquid-absorbent.

In this manufacturing method, after can also terminating before above-mentioned interlayer fusion bonding process will start or just, more It says to body, immediately to laminated body 10P (stacking before or after will carry out heat embossing processing using a pair of of knurling rolls 52,53 Non-woven fabrics 10) implement calendering process.It is well known that calendering process be with stack to the fiber assemblies such as non-woven fabrics apply heat and Pressure makes the processing of fiber assembly densification.Because by before or after above-mentioned interlayer fusion bonding process to laminated body 10P implements calendering process, i.e. " the entrance substrate nonwoven of hydrophobic fibre 15 the advantages of further to promote above-mentioned direct spinning In cloth 11P ", so every characteristic such as liquid-absorbent, intensity of stacking non-woven fabrics 10 can further improve.Calendering process is made Radical, configuration of stack etc. are not particularly limited, such as the tandem type being made of 3 stacks or inclination can be used Type, the tandem type being made of 4 stacks, inverted L shape, Z-type or inclination Z-type, the Z-type being made of 5 stacks or L-type.In addition, The temperature of calendering process be preferably be used as the softening point of the composition fiber of the laminated body 10P (stacking non-woven fabrics 10) of machined object with Under.When carrying out calendering process more than this softening point, it is possible to so that non-woven fabrics is hardened, skin sense of touch is deteriorated.

In this manufacturing method, before hydrophobic fibre 15 can also being accumulated on substrate non-woven fabrics 11P, more specifically It says, before the substrate non-woven fabrics 11P on the production line of stacking non-woven fabrics 10 in conveying passes through spinneret 51, to substrate non-woven fabrics 11P implements calendering process.Distance reduces between the fiber of substrate non-woven fabrics 11 as a result, and capillary pressure increases, thus liquid absorption Property increase, so also may be implemented in absorbing liquid even if the hydrophobic second layer is the layer that distance is bigger and grammes per square metre is low between fiber Exsiccation this effect in the second face side 10b after body.In short, the implementation time of the calendering process of this manufacturing method can be above-mentioned interlayer Before fusion bonding process will start or just terminate after, can also be on substrate non-woven fabrics 11P accumulate hydrophobic fibre 15 it Before or both sides be ok.

Alternatively, it is also possible to use calendering process in the manufacturing process of substrate non-woven fabrics 11P.That is, can also be in above-mentioned fibre After before fusion bonding process will start between dimension or just having terminated, between the above-mentioned web (tablet of welding not carrying out fiber.Base The precursor of bottom non-woven fabrics 11P.) implement calendering process.

As described above, stacking non-woven fabrics of the invention include following form, that is, with threadiness, sheet, elastomer collection The elastomeric element of forms such as fit (elastic fibrous layers) is between first layer and the second layer.Manufacturing this elastomeric element configuration In the case where the stacking non-woven fabrics of the structure of the interlayer of lit-par-lit structure, as long as it is fine to accumulate hydrophobicity on substrate non-woven fabrics 11P Before dimension 15, elastomeric element is configured on substrate non-woven fabrics 11P.As long as the configuration method of such elastomeric element is according to bullet Property component the appropriate selection such as form.For example, configuring aggregate, that is, elastic fibrous layer of elastomer as elastic portion , can also be in the same manner as hydrophobic fibre 15 in the case where part, it will be in the elastomer Direct Spinning to substrate non-woven fabrics 11P.

In the following, being based on its preferred embodiment to absorbent commodity of the invention and being described with reference to the accompanying drawings.This hair Bright absorbent commodity is characterized by having the stacking non-woven fabrics this point of aforementioned present invention.In detail, as described above, originally The stacking non-woven fabrics of invention has the lit-par-lit structure of the fibrous layer containing thermoplastic fibre, which has the following structure, That is, having first face on a surface as the stacking non-woven fabrics and as second face on another surface, first face by Hydrophilic first layer containing hydrophilic fibre is constituted, and is configured in second surface side of the first layer and is contained hydrophobic fibre The hydrophobic second layer, in absorbent commodity of the invention, the stacking non-woven fabrics with this second facing towards wearer flesh The mode of skin side configures.

Fig. 6~Fig. 8 shows an embodiment, that is, pull-on disposable diapers 1 of absorbent commodity of the invention.In addition, Diaper 1 is illustrated based on the composition part different from the embodiment of above-mentioned stacking non-woven fabrics i.e. stacking non-woven fabrics 10, Same composition part marks the same symbol, omits the description.Not specified composition part is suitably used to stacking non-woven fabrics 10 explanation.

As shown in Figure 6 and Figure 7, diaper 1 has ventral region A and back side region B on longitudinal X and is located at the two A, B Between crotch region C, across ventral region A and back side region B have absorber 23, have with before longitudinal X of absorber 23 The veutro waist panel FA and back side waist panel FB that rear end 23A, 23B are respectively compared positioned at outside and extended in the lateral direction y. Here, ventral region A is in the region of the veutro for being configured at wearer when wearing of the absorbent commodities such as disposable diaper, back side Region B is in the region of the back side for being configured at wearer when wearing of the absorbent commodities such as disposable diaper.Ventral region A and back Side region B is the waist portion corresponding with the waistline of wearer when wearing in diaper 1.

As shown in fig. 7, refer to will be from the front end of the ventral region side A of longitudinal X of absorber 23 by veutro waist panel FA The ora terminalis of 23A acts the ventral region side A for being located at the outside longitudinal direction X and the region extended in the lateral direction y and longitudinal X from absorber 23 The region that is combined of the region that extends in the lateral direction y front end 23A.In addition, refer to will be from absorption by back side waist panel FB The ora terminalis of the rear end 23B of the back side region side B of longitudinal X of body 23 acts the region for being located at and extending on the outside of the X of longitudinal direction and in the lateral direction y The region being combined with the region extended in the lateral direction y the rear end 23B of the back side region side B of longitudinal X from absorber 23.

As shown in Figure 6 and Figure 7, diaper 1 has absorbent main body 2 and is configured at the non-skin abutment face of absorbent main body 2 Side and the exterior body 3 for fixing the absorbent main body 2, exterior body 3 have longitudinal X with the absorber 23 for constituting absorbent main body 2 Rear ends 23A, 23B compare positioned at outside and the veutro waist panel FA and back side waist panel FB that extend in the lateral direction y. In diaper 1, stretching region (waist pars contractilis G1 and waist lower part pars contractilis G2) is formed in veutro waist panel FA and back side Waist panel FB.

As shown in fig. 7, diaper 1 is by left and right sides edge 3a1,3a1 and exterior body 3 of the ventral region A of exterior body 3 The left and right sides edge 3b1,3b1 of back side region B is engaged and is formed with a pair of of side seal portion S, S, waist opening portion WO and a pair of of leg The so-called pull-on disposable diaper of portion opening portion LO, LO (referring to Fig. 6).Shape after overlooking expansion shown in Fig. 7 and elongation When state, the exterior body 3 of preferred diaper 1 is divided into and is configured at the ventral region A of the veutro of wearer when wearing, matches when wearing The crotch region C being placed between the back side region B and ventral region A of the back side of wearer and back side region B.It is mentioned here The expansion of diaper 1 and elongation state, tear side seal portion S as shown in fig. 7, referring to, so that diaper 1 is become unfolded state, make each portion Point elastomeric element elongation, spread out state diaper 1 expand to as design size (with entirely eliminated elastomeric element Influence in the state of size when being extended to planar it is identical) state.

In the present specification, so-called " skin abutment face " refers to diaper 1 or its component parts (such as absorbent main body 2) In when wearing towards the face of the skin side of wearer, it is so-called " non-skin abutment face ", refer in diaper 1 or its component parts When wearing towards the side (garment side) opposite with the skin side of wearer face.In addition, longitudinal X is phase in diaper 1 When in the direction in the direction that the veutro from wearer extends via crotch part to back side, and be by diaper 1 be launched into plane and In the state of elongation, from ventral region A to the direction of back side region B.In addition, transverse direction Y is the direction orthogonal with longitudinal X, and it is The width direction of the diaper 1 of state after being launched into plane and extending.In addition, diaper 1 becomes about as shown in Figure 7 in longitudinal direction The symmetrical shape of longitudinal centre line CL1 extended on X.In addition, the CL2 in Fig. 7 is that diaper 1 is divided into two transversely The cross central line that Y extends, it is orthogonal with longitudinal centre line CL1.

In diaper 1, absorbent main body 2 has longitudinal direction X phase as shown in fig. 7, under the expansion of diaper 1 and elongation state To longer elongate shape.Absorbent main body 2 includes the liquid permeability positive dough sheet 21 for forming skin abutment face, forms non-skin abutting The back sheet 22 of the difficult liquid permeability (also including water-repellancy) in face and the liquid retention absorber being configured between the two pieces 21,22 23.In addition, in the both sides along longitudinal X (length direction) of absorbent main body 2, as shown in fig. 7, being provided with has vertical The leakage-proof turnup 24,24 of the elastomeric element of the state configuration extended on X.Specifically, leakage-proof turnup 24 by difficult liquid permeability or Water-repellancy and the raw material of gas permeability composition, near the free end of each leakage-proof turnup 24, with the state extended on longitudinal X Configured with leakage-proof turnup formation elastomeric element 25.When wearing diaper, pass through the leakage-proof turnup formation receipts of elastomeric element 25 The free end side of contracting, leakage-proof turnup 24 erects, and body fluid is prevented to flow out to lateral Y.

The absorbent main body 2 constituted in the above-described manner is as shown in fig. 7, its length direction and the urine under expansion and elongation state Longitudinal X of cloth 1 is consistent, by the fixed bonding agent of main body, is bonded on the central portion of exterior body 3.In this way, the configuration of exterior body 3 exists The non-skin abutment face side of back sheet 22 on the thickness direction of disposable diaper 1, constituting absorbent main body 2, and it is glued It is fixed.Therefore, in diaper 1, the absorber 23 for constituting absorbent main body 2 is matched in a manner of across ventral region A and back side region B It sets.

In diaper 1, as shown in fig. 7, exterior body 3 has with rear ends 23A, 23B of longitudinal X of absorber 23 respectively Compared to the veutro waist panel FA and back side waist panel FB for being located at outside and extending in the lateral direction y.Moreover, such as Fig. 6~Fig. 8 institute Show, exterior body 3 has the outer-skin sheet 6 of the non-skin abutment face side for the outer surface for forming diaper 1, is configured at the skin of outer-skin sheet 6 The inner layer piece 3i of surface side is abutted, outer-skin sheet 6 has the extension inner layer stretched out from the rear ends of longitudinal X of inner layer piece 3i Fold back portion 6R made of the skin abutment face side of piece 3i is turned back.As shown in fig. 7, the fold back portion 6R of outer-skin sheet 6 is formed as horizontal To the longer rectangular shape of Y.Rear ends 23A, 23B of absorbent main body 2 are folded back part 6R cladding respectively.

As described above, diaper 1 has ventral region A and back side region B as corresponding with the waistline of wearer when wearing Waist portion, as shown in fig. 7, in two region A, B, at least formed with waist pars contractilis G1 and the pars contractilis G2 conduct of waist lower part Stretching region, and then leg pars contractilis G3 can also be formed with.That is, exterior body 3 is in two region A, B and is constituting exterior body 3 Between outer-skin sheet 6 and inner layer piece 3i, there are state multiple elastic portions that interval configures on longitudinal X to extend in the lateral direction y Part 71 is formed with waist pars contractilis G1 and waist lower part pars contractilis G2 and is used as to have in the lateral direction y and stretch as a result, in two region A, B The stretching region of contracting.In addition, exterior body 3 has multiple leg elastic members 72, multiple leg elastic members 72 are with from two The state configuration that region A, B arrive the mode of crotch region C respectively to extend in prescribed direction outer-skin sheet 6 and inner layer piece 3i it Between, as a result, in these regions A, B, C, leg pars contractilis G3 can be formed as stretching region.

In diaper 1, as shown in Figure 6 and Figure 7, waist pars contractilis G1 is formed in end flaps, and the end flaps are in longitudinal X The ora terminalis of rear ends 23A, 23B of the upper longitudinal X for being located at the absorber 23 than constituting absorbent main body 2 more lean on that longitudinal X's is outer Side (side opposite with the side cross central line CL2).In addition, waist lower part pars contractilis G2 is formed in the side wing in diaper 1 Piece, the side flaps are on longitudinal X positioned at the lower end of the side cross central line CL2 of waist pars contractilis G1 and the lower end of side seal portion S Between.Above-mentioned back side waist panel FB and veutro waist panel FA is also by above-mentioned end flaps (waist pars contractilis G1) and upper Region after stating a part merging of side flaps (waist lower part pars contractilis G2).In addition, in diaper 1, such as Fig. 6 and Fig. 7 institute Show, leg pars contractilis G3 is formed in the peripheral part of leg opening part LO.

As shown in Figure 6 to 8, diaper 1 have can absorbing sweat absorbing sweat piece 10 (referring to Fig.1), which is above-mentioned Non-woven fabrics 10 is laminated in one embodiment of the stacking non-woven fabrics of invention.Absorbing sweat piece 10 is so that the second face 10b (hydrophobic Two layer 12 of outer surface) mode towards the skin side of wearer configures.

In diaper 1, absorbing sweat piece 10 mainly for the purpose of the sweat of waistline for absorbing wearer, is configured in above-mentioned waist portion Stretching region.That is, as shown in fig. 7, absorbing sweat piece 10 is in longer shape on a direction when looking down, specifically, being in rectangle Shape (band-like) keeps its length direction consistent with transverse direction Y, throughout as waist portion ventral region A and back side region B it is respective Lateral Y overall length and configure, at least throughout waist pars contractilis G1 and waist lower part pars contractilis G2 and configure.In detail, absorbing sweat piece 10, by engagement means well known to bonding agent, heat sealing, ultrasonic sealing function etc., are bonded on the flesh of the fold back portion 6R of outer-skin sheet 6 On skin bearing surface.Fold back portion 6R in diaper 1 when wearing, configure than absorber 23 closer to wearer skin position (referring to Fig. 8), therefore, is configured at the absorbing sweat piece 10 in the skin abutment face of fold back portion 6R in diaper 1 when wearing, and configuration exists Than absorber 23 closer to wearer skin position, can be contacted with the skin of wearer.

In the diaper 1 with that above structure, because of the absorbing sweat piece 10 (stacking non-woven fabrics 10) with ability of sweat absorption In waist portion, that is, ventral region A and the respective skin abutment face side back side region B, it is arranged to the wearer's near diaper 1 Skin, and the configuring area of its absorbing sweat piece 10 be comprising including waist pars contractilis G1 and waist lower part pars contractilis G2 in lateral Y The upper stretching region with retractility, so in diaper 1 when wearing, by tight caused by the convergent force as the stretching region Gu the second face of hydrophobicity 10b (referring to Fig.1) fitness of absorbing sweat piece 10 is abutted with the skin of wearer well, can be promptly It absorbs, evaporate the sweat given out from skin.

In diaper 1, as noted previously, as absorbing sweat piece 10 (stacking non-woven fabrics 10) configures in stretching region, therefore from From the viewpoint of improving the fitness relative to the skin of wearer, absorbing sweat piece 10 is it is also preferred that in side identical with the stretching region There is retractility on i.e. transverse direction Y.From the point of view of this viewpoint, preferably between the first layer 11 in absorbing sweat piece 10 and the second layer 12 Configured in the lateral direction y with the elastomeric element (retractility component) of retractility.The elastomeric element is as described above.

The forming material of each section of diaper 1 is illustrated, as positive dough sheet 21, the back side for constituting absorbent main body 2 Piece 22, absorber 23 and leakage-proof turnup 24 etc., can be without particular limitation using absorbent commodities institutes such as current disposable diapers The a variety of materials etc. used.For example, non-woven fabrics, the apertured film etc. of single-layer or multi-layer construction can be used as positive dough sheet 21.As Penetrability resin film etc. can be used in back sheet 22.As absorber 23, can be used the particle and undulation degree of absorbable polymer Absorber made of the absorbent cores that material is constituted are coated with cotton paper.In addition, as leakage-proof turnup 24, can be used water-repellancy single layer or The non-woven fabrics etc. of multi-ply construction.In addition, as elastomeric element, (leakage-proof turnup, which is formed, uses elastomeric element 25, elastomeric element 71, leg Elastomeric element 72 etc.), such as the synthetic rubber such as styrene-butadiene, butadiene, isoprene, neoprene, day can be enumerated Right rubber, EVA, expandable polyolefin hydrocarbon, polyurethane etc..It the use of section is preferably rectangle, pros as the form of elastomeric element The threadiness (line rubber etc.) of shape, circle, ellipse or polygon etc. or the form etc. of band-like (rubber strip etc.).In addition, as will The hot-melt adhesive etc. currently used for this absorbent commodity can be used in the engagement means that the component parts of diaper 1 is engaged with each other Various bonding agents.

More than, based on embodiments thereof, the present invention is described, but the present invention is not limited by above embodiment, can It suitably changes.

For example, an embodiment of stacking non-woven fabrics of the invention is laminated non-woven fabrics 10 and is used as absorbing sweat in diaper 1 Piece 10 uses, as long as but absorbent commodity of the invention there is stacking non-woven fabrics of the invention, and the stacking non-woven fabrics so that Its mode of the second face (the hydrophobicity face with interlayer weld portion) towards the skin side of wearer configures, layer of the invention Folded non-woven fabrics, which can be used as other component parts other than absorbing sweat piece, to be come using in addition, configuring in the case where being used as absorbing sweat piece Position is also not limited to the configuration position of the absorbing sweat piece 10 in diaper 1.

Other purposes of the component parts as absorbent commodity as stacking non-woven fabrics of the invention, can enumerate configuration In than absorber closer to wearer skin position positive dough sheet.That is, as positive dough sheet 21, can make for example in diaper 1 With stacking non-woven fabrics 10.

In addition, in the exterior body 3 of diaper 1, as shown in fig. 7, being configured with elastic portion between outer-skin sheet 6 and inner layer piece 3i Part 71, however, you can also not configure elastomeric element 71.In the case where forming stretching region in the form of not configuring elastomeric element 71, As the component parts of exterior body 3, as long as using in the lateral direction y with the flexible nonwoven fabrics of retractility.

In addition, in diaper 1, as shown in fig. 7, exterior body 3 is in spread ventral region A, crotch region C and back side region B Continuous shape, but can also instead, exterior body 3 in be divided into respectively as seperated component veutro exterior body, back The shape of the Splittable of side exterior body and crotch exterior body.

In addition, absorbent commodity of the invention is not limited to pull-on disposable diaper as diaper 1 as described above, It can be applied to absorb storewide used in body fluid, for example, can be applied to flat type disposable diaper, sanitary napkin.

In turn, absorbing sweat piece of the invention is not limited to the application in above-mentioned absorbent commodity, can also be applied to absorb Article other than property article.For example, being the piece itself for wiping the sweat and using as user, absorbing sweat piece of the invention can be used.It removes Except this, insole, sweat pad under armpit, eyeshade, mask etc. can also be applied to, it is of the invention by being configured towards the skin side of wearer Absorbing sweat piece can promptly be absorbed, be evaporated from sole, oxter, the on the face sweat that gives out.

About the embodiment of aforementioned present invention, following note is also disclosed.

A kind of stacking non-woven fabrics of 1 > of <, the lit-par-lit structure with the fibrous layer containing thermoplastic fibre, wherein

Above-mentioned lit-par-lit structure has first face on a surface as above-mentioned stacking non-woven fabrics and as another surface The second face, which is made of hydrophilic first layer, in second surface side of the first layer configured with hydrophobic the Two layers,

Above-mentioned lit-par-lit structure have thickness it is smaller than peripheral portion and constitute each layer of the lit-par-lit structure each other welding one The interlayer weld portion risen,

Above-mentioned first layer is in addition to above-mentioned interlayer weld portion, structure also smaller than peripheral portion with thickness and the first layer Weld portion between the fiber being welded together each other at fiber,

By relative to above-mentioned first face and the above-mentioned respective area in second face, above-mentioned interlayer weld portion in the face and In the case that the ratio of total area of weld portion is known as the weld portion the area ratio in respective face between above-mentioned fiber, above-mentioned first face Weld portion the area ratio is greater than the weld portion the area ratio in above-mentioned second face.

2 > of < stacking non-woven fabrics according to above-mentioned 1 > of <, wherein

The ratio of the weld portion the area ratio in above-mentioned first face and the weld portion the area ratio in above-mentioned second face with the former/the latter's table It is 1.3~3.0 when showing.

3 > of < stacking non-woven fabrics according to above-mentioned 1 > of < or 2 > of <, wherein

The plan view shape, single of the configuration pattern of weld portion between above-mentioned interlayer weld portion and above-mentioned fiber, single weld portion It is distance between the area of weld portion, weld portion, at least two in pitch different.

4 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 3 >, wherein

Above-mentioned interlayer weld portion is recessed in a concave shape from above-mentioned second surface side to above-mentioned first surface side.

5 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 4 >, wherein

Weld portion is recessed in a concave shape from above-mentioned first surface side to above-mentioned second surface side between above-mentioned fiber.

6 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 5 >, wherein

Above-mentioned second face has the interlayer weld portion dispersion configuring area for being dispersed with multiple above-mentioned interlayer weld portions, in the layer Between weld portion dispersion configuring area any position on hypothetically equipped with radius 2mm circle in the case where, wrapped in its imaginary circle Part or all of the above-mentioned interlayer weld portion containing at least one.

7 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 6 >, wherein

The area of above-mentioned interlayer weld portion is 15% or less relative to the ratio of the area in above-mentioned second face.

8 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 7 >, wherein

Weld portion is short between the above-mentioned fiber of pitch ratio of above-mentioned interlayer weld portion.

9 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 8 >, wherein

Area of 1 above-mentioned interlayer weld portion in above-mentioned second face is 0.3mm²Hereinafter, weld portion between fiber more above-mentioned than 1 Area in above-mentioned first face is small.

10 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 9 >, wherein

1 above-mentioned interlayer weld portion between the area and 1 above-mentioned fiber in above-mentioned second face weld portion in above-mentioned first face Area ratio with the former/the latter indicate when for 0.25 or more 0.8 or less.

11 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 10 >, wherein

Total grammes per square metre of above-mentioned first layer and the above-mentioned second layer is 8g/m²The above 30g/m²Below.

12 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 11 >, wherein

The grammes per square metre of above-mentioned first layer is 5g/m²The above 25g/m²Below.

13 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 12 >, wherein

For above-mentioned first layer, the water-wetness of above-mentioned second surface side is higher than above-mentioned first surface side.

14 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 13 >, wherein

Above-mentioned first layer contains the composition fiber that surface is attached with hydrophilic agent.

15 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 14 >, wherein

In above-mentioned first layer, compared with above-mentioned first surface side, the hydrophilic agent for being attached to the surface of composition fiber is more Ground bias is in above-mentioned second surface side.

16 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 15 >, wherein

Above-mentioned first layer is the hydrophilic non-woven containing the composition fiber for being mixed with hydrophilic agent.

17 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 16 >, wherein

The grammes per square metre of the above-mentioned second layer is 3g/m²The above 15g/m²Below.

18 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 17 >, wherein

Distance is shorter than the above-mentioned second layer between the fiber of the composition fiber of above-mentioned first layer.

19 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 18 >, wherein

The fibre weight of the per unit area of the composition fiber of above-mentioned first layer is more than the composition fiber of the above-mentioned second layer.

20 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 19 >, wherein

The fibre diameter of the composition fiber of above-mentioned first layer is smaller than the composition fiber of the above-mentioned second layer.

21 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 20 >, wherein

It is configured in above-mentioned second surface side of the above-mentioned second layer and contains long stapled long fibre layer.

22 > of < stacking non-woven fabrics according to above-mentioned 21 > of <, wherein

Above-mentioned long fibre layer has hydrophilic layer, which contains the composition fiber for being mixed with hydrophilic agent.

23 > of < stacking non-woven fabrics according to any one of above-mentioned 1 > of <~<, 22 >, wherein

Elastomeric element is present between above-mentioned first layer and the above-mentioned second layer.

A kind of manufacturing method that non-woven fabrics is laminated of 24 > of <, the stacking non-woven fabrics have the fibrous layer containing thermoplastic fibre Lit-par-lit structure, each layer for constituting the lit-par-lit structure is mutually welded together, the stacking nonwoven each other by interlayer weld portion The manufacturing method of cloth includes:

The process for obtaining laminated body, conveying has density ratio peripheral portion high and constitutes fiber to be welded together each other Fiber between weld portion hydrophilic base non-woven fabrics, on the substrate non-woven fabrics in its conveying accumulation by resin carry out spinning and Obtained hydrophobic fibre, obtains laminated body；With

Above-mentioned laminated body is locally compressed and is heated in a thickness direction, forms above-mentioned interlayer by interlayer fusion bonding process Weld portion.

The manufacturing method of non-woven fabrics is laminated in 25 > of < according to above-mentioned 24 > of <, wherein

Before above-mentioned interlayer fusion bonding process will start or just terminate after, to above-mentioned laminated body implement calendering process.

The manufacturing method of non-woven fabrics is laminated in 26 > of < according to above-mentioned 24 > of < or 25 > of <, wherein

Above-mentioned substrate non-woven fabrics is manufactured by following process: resin is carried out the fibre of hydrophily obtained from spinning by accumulation Dimension, the process for obtaining web；The web is locally compressed and is added in a thickness direction by the fusion bonding process between fiber Heat forms weld portion between above-mentioned fiber,

Before fusion bonding process will start between above-mentioned fiber or just terminate after, to above-mentioned web implement calendering at Reason.

The manufacturing method of non-woven fabrics is laminated in 27 > of < according to any one of above-mentioned 24 > of <~<, 26 >, wherein

Before accumulating above-mentioned hydrophobic fibre on above-mentioned substrate non-woven fabrics, calendering process is implemented to the substrate non-woven fabrics.

The manufacturing method of non-woven fabrics is laminated in 28 > of < according to any one of above-mentioned 24 > of <~<, 27 >, wherein

Weld portion is formed and compressing in a thickness direction from a surface side between the above-mentioned fiber of above-mentioned substrate non-woven fabrics, Above-mentioned hydrophobic fibre is accumulated on the face of the side opposite with its compressing surface.

The manufacturing method of non-woven fabrics is laminated in 29 > of < according to any one of above-mentioned 24 > of <~<, 28 >, wherein

It is coated with hydrophilic agent on a face of above-mentioned substrate non-woven fabrics, on the coated face of its hydrophilic agent in accumulation State hydrophobic fibre.

The manufacturing method of non-woven fabrics is laminated in 30 > of < according to any one of above-mentioned 24 > of <~<, 29 >, wherein

Before accumulating above-mentioned hydrophobic fibre on above-mentioned substrate non-woven fabrics, elastic portion is configured on the substrate non-woven fabrics Part.

The manufacturing method of non-woven fabrics is laminated in 31 > of < according to any one of above-mentioned 24 > of <~<, 30 >, wherein

In the process for obtaining above-mentioned laminated body, repeatedly above-mentioned hydrophobic fibre is accumulated on above-mentioned substrate non-woven fabrics.

A kind of absorbent commodity of 32 > of < comprising stacking non-woven fabrics, which, which has, contains thermoplastic fibre Fibrous layer lit-par-lit structure, wherein

By relative to above-mentioned first face and the above-mentioned respective area in second face, above-mentioned interlayer weld portion in the face and In the case that the ratio of total area of weld portion is known as the weld portion the area ratio in respective face between above-mentioned fiber, above-mentioned first face Weld portion the area ratio is bigger than above-mentioned second face,

The second mode facing towards the skin side of wearer more than above-mentioned stacking non-woven fabrics is stated to configure.

33 > of < absorbent commodity according to above-mentioned 32 > of <, wherein

Absorber with liquid retention is configured with above-mentioned stacking in the position than the absorber closer to the skin of wearer Non-woven fabrics.

34 > of < absorbent commodity according to above-mentioned 32 > of < or 33 > of <, wherein

Above-mentioned absorbent commodity has waist portion corresponding with the waistline of wearer, is configured with above-mentioned stacking in the waist portion Non-woven fabrics.

35 > of < absorbent commodity according to above-mentioned 34 > of <, wherein

There is stretching region in above-mentioned waist portion, be configured with above-mentioned stacking non-woven fabrics in the stretching region.

36 > of < absorbent commodity according to above-mentioned 35 > of <, wherein

Elastomeric element is present in the above-mentioned first layer in above-mentioned stacking non-woven fabrics and between the above-mentioned second layer.

37 > of < absorbent commodity according to above-mentioned 32 > of <, wherein

With the absorbing sweat piece for capableing of absorbing sweat, which is above-mentioned stacking non-woven fabrics.

A kind of absorbing sweat piece of 38 > of <, with the fibrous layer containing thermoplastic fibre lit-par-lit structure, have the first face and Positioned at the second face of its opposite side, by make this second facing towards the skin side of wearer in a manner of use, wherein

Above-mentioned first face is made of hydrophilic first layer, in above-mentioned second surface side of the first layer configured with hydrophobic The second layer,

By relative to above-mentioned first face and the above-mentioned respective area in second face, above-mentioned interlayer weld portion in the face and In the case that the ratio of total area of weld portion is known as the weld portion the area ratio in respective face between above-mentioned fiber, above-mentioned first face Weld portion the area ratio is bigger than above-mentioned second face.

The application for absorbing sweat of non-woven fabrics is laminated described in any one of above-mentioned 1 > of <~<, 23 > of 39 > of <.

A kind of absorbing sweat method of 40 > of <, using the stacking non-woven fabrics described in any one of above-mentioned 1 > of <~<, 23 > into Row absorbing sweat.

Industrial utilizability

According to the present invention, it is possible to provide a kind of absorbent properties of the body fluid such as sweat or urine excellent stacking non-woven fabrics and its manufacturer Method and absorbent commodity and absorbing sweat piece.

Claims

1. a kind of stacking non-woven fabrics, the lit-par-lit structure with the fibrous layer containing thermoplastic fibre, the spy of the stacking non-woven fabrics Sign is:

The lit-par-lit structure has as first face on the surface that non-woven fabrics is laminated and as the of another surface Two faces, first face are made of hydrophilic first layer, are configured with the hydrophobic second layer in second surface side of the first layer,

The lit-par-lit structure has thickness smaller than peripheral portion and constitutes what each layer of the lit-par-lit structure was welded together each other Interlayer weld portion,

For the first layer in addition to the interlayer weld portion, composition also smaller than peripheral portion with thickness and the first layer is fine Weld portion between the fiber that dimension is welded together each other,

Will be relative to first face and the respective area in the second face, the interlayer weld portion in the face and described In the case that the ratio of total area of weld portion is known as the weld portion the area ratio in respective face between fiber, the welding in first face Portion's the area ratio is greater than the weld portion the area ratio in second face.

2. stacking non-woven fabrics according to claim 1, it is characterised in that:

The ratio of the weld portion the area ratio in first face and the weld portion the area ratio in second face with the former/the latter indicate when It is 1.3~3.0.

3. stacking non-woven fabrics according to claim 1 or 2, it is characterised in that:

The configuration pattern, the plan view shape of single weld portion, single welding of weld portion between the interlayer weld portion and the fiber It is distance between the area in portion, weld portion, at least two in pitch different.

4. stacking non-woven fabrics described in any one of claim 1 to 3, it is characterised in that:

The interlayer weld portion is recessed in a concave shape from second surface side to first surface side.

5. stacking non-woven fabrics according to any one of claims 1 to 4, it is characterised in that:

Weld portion is recessed in a concave shape from first surface side to second surface side between the fiber.

6. stacking non-woven fabrics according to any one of claims 1 to 5, it is characterised in that:

Second face has the interlayer weld portion dispersion configuring area for being dispersed with multiple interlayer weld portions, molten in the interlayer In the case that socket part is distributed on any position in region the hypothetically circle equipped with radius 2mm, comprising extremely in its imaginary circle Part or all of few 1 interlayer weld portion.

7. stacking non-woven fabrics described according to claim 1~any one of 6, it is characterised in that:

The area of the interlayer weld portion is 15% or less relative to the ratio of the area in second face.

8. stacking non-woven fabrics according to any one of claims 1 to 7, it is characterised in that:

The pitch of the interlayer weld portion is shorter than the pitch of weld portion between the fiber.

9. stacking non-woven fabrics described according to claim 1~any one of 8, it is characterised in that:

Area of 1 interlayer weld portion in second face is 0.3mm²Hereinafter, weld portion is in institute between the fiber more described than 1 The area for stating the first face is small.

10. stacking non-woven fabrics described according to claim 1~any one of 9, it is characterised in that:

The 1 interlayer weld portion face of weld portion in first face between the area and 1 fiber in second face Long-pending ratio with the former/the latter indicate when for 0.25 or more 0.8 or less.

11. stacking non-woven fabrics described according to claim 1~any one of 10, it is characterised in that:

Total grammes per square metre of the first layer and the second layer is 8g/m²The above 30g/m²Below.

12. stacking non-woven fabrics described according to claim 1~any one of 11, it is characterised in that:

The grammes per square metre of the first layer is 5g/m²The above 25g/m²Below.

13. stacking non-woven fabrics described according to claim 1~any one of 12, it is characterised in that:

In the first layer, the water-wetness of second surface side is higher than the water-wetness of first surface side.

14. stacking non-woven fabrics described according to claim 1~any one of 13, it is characterised in that:

The first layer contains the composition fiber that surface is attached with hydrophilic agent.

15. stacking non-woven fabrics described according to claim 1~any one of 14, it is characterised in that:

In the first layer, compared with first surface side, the hydrophilic agent for being attached to the surface of composition fiber is more inclined Against second surface side.

16. stacking non-woven fabrics described according to claim 1~any one of 15, it is characterised in that:

The first layer is the hydrophilic non-woven containing the composition fiber for being mixed with hydrophilic agent.

17. stacking non-woven fabrics described according to claim 1~any one of 16, it is characterised in that:

The grammes per square metre of the second layer is 3g/m²The above 15g/m²Below.

18. stacking non-woven fabrics described according to claim 1~any one of 17, it is characterised in that:

Distance is shorter than distance between the fiber of the composition fiber of the second layer between the fiber of the composition fiber of the first layer.

19. stacking non-woven fabrics described according to claim 1~any one of 18, it is characterised in that:

Per unit of the fibre weight of the per unit area of the composition fiber of the first layer more than the composition fiber of the second layer The fibre weight of area.

20. stacking non-woven fabrics described according to claim 1~any one of 19, it is characterised in that:

The fibre diameter of the composition fiber of the first layer is less than the fibre diameter of the composition fiber of the second layer.

21. stacking non-woven fabrics described according to claim 1~any one of 20, it is characterised in that:

It is configured in second surface side of the second layer and contains long stapled long fibre layer.

22. stacking non-woven fabrics according to claim 21, it is characterised in that:

The long fibre layer has hydrophilic layer, and the hydrophilic layer contains the composition fiber for being mixed with hydrophilic agent.

23. stacking non-woven fabrics described according to claim 1~any one of 22, it is characterised in that:

Elastomeric element is present between the first layer and the second layer.

24. a kind of manufacturing method that non-woven fabrics is laminated, the stacking non-woven fabrics have the stacking of the fibrous layer containing thermoplastic fibre Construction, each layer for constituting the lit-par-lit structure are mutually welded together each other by interlayer weld portion, the stacking non-woven fabrics Manufacturing method includes:

The process for obtaining laminated body, conveying has density ratio peripheral portion high and constitutes the fibre that fiber is welded together each other The hydrophilic base non-woven fabrics of weld portion between dimension, resin is carried out spinning and obtained by accumulation on the substrate non-woven fabrics in its conveying Hydrophobic fibre, obtain laminated body；With

The laminated body is locally compressed and is heated in a thickness direction, forms the interlayer welding by interlayer fusion bonding process Portion.

25. the manufacturing method of stacking non-woven fabrics according to claim 24, it is characterised in that:

Before or after the interlayer fusion bonding process, calendering process is implemented to the laminated body.

26. the manufacturing method of non-woven fabrics is laminated according to claim 24 or 25, it is characterised in that:

The substrate non-woven fabrics is manufactured by following process: resin is carried out hydrophilic fibre obtained from spinning by accumulation, is obtained To the process of web；The web is locally compressed and is heated in a thickness direction, formed by the fusion bonding process between fiber Weld portion between the fiber,

Between the fiber before or after fusion bonding process, calendering process is implemented to the web.

27. the manufacturing method of non-woven fabrics is laminated according to any one of claim 24~26, it is characterised in that:

Before accumulating the hydrophobic fibre on the substrate non-woven fabrics, calendering process is implemented to the substrate non-woven fabrics.

28. the manufacturing method of non-woven fabrics is laminated according to any one of claim 24~27, it is characterised in that:

Weld portion is formed and compressing from one side lateral edge thickness direction between the fiber of the substrate non-woven fabrics, is pressed with it The hydrophobic fibre is accumulated on the face of the opposite side in contracting face.

29. the manufacturing method of non-woven fabrics is laminated according to any one of claim 24~28, it is characterised in that:

It is coated with hydrophilic agent on a face of the substrate non-woven fabrics, described dredge is accumulated on the coated face of its hydrophilic agent Aqueous fiber.

30. the manufacturing method of non-woven fabrics is laminated according to any one of claim 24~29, it is characterised in that:

Before accumulating the hydrophobic fibre on the substrate non-woven fabrics, elastomeric element is configured on the substrate non-woven fabrics.

31. the manufacturing method of non-woven fabrics is laminated according to any one of claim 24~30, it is characterised in that:

In the process for obtaining the laminated body, the hydrophobic fibre is repeatedly accumulated on the substrate non-woven fabrics.

32. a kind of absorbent commodity comprising stacking non-woven fabrics, the stacking non-woven fabrics have the fibrous layer containing thermoplastic fibre Lit-par-lit structure, the absorbent commodity is characterized in that:

Will be relative to first face and the respective area in the second face, the interlayer weld portion in the face and described In the case that the ratio of total area of weld portion is known as the weld portion the area ratio in respective face between fiber, the welding in first face Portion's the area ratio is greater than the weld portion the area ratio in second face,

The stacking non-woven fabrics configures in such a way that described second facing towards the skin side of wearer.

33. absorbent commodity according to claim 32, it is characterised in that:

Absorber with liquid retention is configured with the stacking nonwoven in the position than the absorber closer to the skin of wearer Cloth.

34. the absorbent commodity according to claim 32 or 33, it is characterised in that:

The absorbent commodity has waist portion corresponding with the waistline of wearer, is configured with the stacking nonwoven in the waist portion Cloth.

35. absorbent commodity according to claim 34, it is characterised in that:

There is stretching region in the waist portion, be configured with the stacking non-woven fabrics in the stretching region.

36. absorbent commodity according to claim 35, it is characterised in that:

Elastomeric element is present between the first layer and the second layer in the stacking non-woven fabrics.

37. absorbent commodity according to claim 32, it is characterised in that:

With the absorbing sweat piece for capableing of absorbing sweat, which is the stacking non-woven fabrics.

38. a kind of absorbing sweat piece, the lit-par-lit structure with the fibrous layer containing thermoplastic fibre have the first face and are located at its phase The second face tossed about, by make this second facing towards the skin side of wearer in a manner of use, the absorbing sweat piece is characterized in that:

First face is made of hydrophilic first layer, is configured with hydrophobic second in second surface side of the first layer Layer,

39. the application for absorbing sweat of non-woven fabrics is laminated described in any one of claim 1~23.

40. a kind of absorbing sweat method, it is characterised in that:

Absorbing sweat is carried out using stacking non-woven fabrics described in any one of claim 1~23.