CN101410080A - Unfolding type absorbent article and process for producing back sheet for absorbent article - Google Patents
Unfolding type absorbent article and process for producing back sheet for absorbent article Download PDFInfo
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- CN101410080A CN101410080A CNA2007800114335A CN200780011433A CN101410080A CN 101410080 A CN101410080 A CN 101410080A CN A2007800114335 A CNA2007800114335 A CN A2007800114335A CN 200780011433 A CN200780011433 A CN 200780011433A CN 101410080 A CN101410080 A CN 101410080A
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Abstract
The object of the invention is to diminish the breakage of a back sheet caused by the application/stripping of a fixing tape. A back sheet (12) obtained by superposing a hydrophobic sheet (12A) made of a hydrophobic resin and nonwoven fabric sheets (12B and 12C) and press-bonding the sheets is used. In forming the sheet (12), the hydrophobic sheet (12A) and the nonwoven fabric sheets (12B and 12C) are superposed together with a hot-melt adhesive interposed between these, and the sheets are then press-bonded with heating. The bond strength between the hydrophobic sheet (12A) and the nonwoven fabric sheets (12B and 12C) is higher than the peel strength between the nonwoven fabric sheets (12B and 12C) and the male material (Y) applied thereto. The sheet (12) has a value determined by a KES flexural test of 0.05-0.50 gm<2>/cm.
Description
Technical field
The present invention relates to the manufacture method of unfolding type absorbent article and back sheet for absorbent article.
Background technology
Known in the past have a following flat type disposable diaper, it possesses liquid permeability surface patch, opaque liquid back sheet and is folded in two absorbers between the sheet, the restraint zone that is disposed in limit, the left and right sides portion of drosal part is fastened on the fastening part that is disposed at veutro portion precalculated position, to wear.
For the back sheet of this diaper, all be to use the hydrophobicity sheet separately for many years, but in order to improve sense of touch and impression when using, bring into use lateral surface at the hydrophobicity sheet face of the outside (when the wearing) to go up the back sheet of lamination bonded nonwoven sheet gradually.And the back sheet of this laminated structure is made in the following way, that is, only non-woven fabric plate is overlapped on the hydrophobicity sheet earlier, under this state, delivers to roller places such as hot-rolling or knurling rolls, carries out hot pressing, thereby makes back sheet.But, before two sheets are delivered to the roller place, because the registration drift that registration drift that the Tension Difference of two sheets causes or vibration equipment cause, insufficient or the inadequate situation of pressing of embossing appears sometimes, so with hotmelt two sheets are delivered to the roller place after bonding more in advance, to improve the problems referred to above.
On the other hand, in this disposable diaper, usually employing face deduction structure is as retention mechanism, and in this retention mechanism, the hook flooring of usefulness face button forms all or part of of restraint zone, and, on the precalculated position at veutro middle part, the bonding hair side material of broad ways is to form the junction surface, the crimping of above-mentioned hook flooring is joined on the hair side material as the junction surface, carry out fastening.
And, in recent years, be supplied with sheet overleaf on the market from the diaper that forms the junction surface on one's body, this diaper has adopted the face deduction structure that is called as what is called " driftlessness band ", wherein, constitute aforesaid back sheet with the non-woven fabric plate of outer surface side, in the case, broad ways is carried out embossing processing etc. to the veutro middle part of this back sheet particularly, thereby sheet forms the junction surface from one's body overleaf.
Patent documentation 1: Japanese kokai publication hei 10-109371 communique
Patent documentation 2: Japanese kokai publication hei 7-285187 communique
Patent documentation 3: Japanese kokai publication hei 9-253130 communique
But, in the diaper of existing driftlessness band, to peel off after the adhesion along with restraint zone, the hydrophobicity sheet of formation back sheet and the situation of splitting between the non-woven fabric plate or non-woven fabric plate breakage are a lot.And, in order to improve this situation, attempted increasing and be used for both adherent hot melt adhesive dosage, perhaps increase the mode of embossing amount for improving bonding strength, but if will adopt these means to prevent splitting fully separately, then no matter adopt which kind of method, back sheet all can hardening, the sense of touch variation, the non-constant of the impression during use.
On the other hand, carry out simple compromise if wish to increasing hot melt adhesive dosage and increasing embossing processing, then during fabrication, utilize hotmelt carry out bonding after, when offering knurling rolls, also following manufacturing issue can appear, that is, hotmelt overflows from the nonwoven cloth cover because of the heat fusion of knurling rolls, two sheets stick on the knurling rolls, shop problem occurs.
Summary of the invention
So major subjects of the present invention is, prevent to cause when restraint zone in the disposable diaper of so-called driftlessness band from peeling off the breakage of back sheet after adhesion, do not damage sense of touch and flexibility simultaneously.Other problems are, prevent that back sheet is attached to knurling rolls because of hotmelt when making back sheet, prevent that the sense of touch of shop problem and back sheet from descending.In addition, other problems are that fastening person is fastened on the reliable position easily without repetitive operation, and can prevent that the wearer from leaking.
The present invention and the action effect thereof that have solved above-mentioned problem are as follows.
＜technical scheme 1 described invention 〉
A kind of unfolding type absorbent article, it possesses the liquid permeability surface patch, opaque liquid back sheet and be folded in two absorbers between the sheet, in limit, the left and right sides portion of any one party of dorsal part or veutro portion, be provided with restraint zone, part or all of this restraint zone formed by the hook flooring of face button, this hook flooring is joined on the junction surface of being located between veutro portion or the drosal part left and right sides limit portion, to wear, described unfolding type absorbent article is characterised in that, above-mentioned back sheet is that folder is established after hotmelt carries out lamination between hydrophobicity sheet that is made of hydrophobic resin and the non-woven fabric plate that constitutes above-mentioned article outer surface, implementing hot pressing forms, the bonding strength of above-mentioned hydrophobicity sheet and the non-woven fabric plate peel strength height when tightening above-mentioned hook flooring at non-woven fabric plate, and the measured value in the bend test of KES is 0.05～0.50gcm
2/ cm.
(action effect)
At the junction surface that engages restraint zone, peel off (adhering to the back breaks away from) along with after adhering to, also can apply peeling force to the back sheet of institute's lamination, therefore, if the peel strength of the bonding strength between hydrophobicity sheet and the non-woven fabric plate when peeling off after the hook flooring being fastened on the non-woven fabric plate, the situation that splitting or non-woven fabric plate breakage then occur, but, bonding strength among the present invention between hydrophobicity sheet and the non-woven fabric plate is higher than the peel strength when peeling off after described hook flooring is fastened on the non-woven fabric plate, so breakage can not take place.
On the other hand, in the unfolding type absorbent article of the present invention, the measured value in the bend test of the KES of back sheet is 0.05～0.50gcm
2/ cm, thus the sense of touch of product and flexibility excellence, and also product has stiffness, and problems such as shrinkage can not take place when wearing.
In addition, under the situation of the peel strength when being fastened to the hook flooring on the non-woven fabric plate less than 200gf, when wearing product, problems such as restraint zone disengagement might take place.On the contrary, under too high situation, under the situation of the peel strength when being fastened on the hook flooring on the non-woven fabric plate greater than 1000gf, adhering to the back, to break away from required strength big, and product is very difficult to use.
Thus, the preferred 200～1000gf/25mm of the bonding strength between hydrophobicity sheet and the non-woven fabric plate.
＜technical scheme 2 described inventions 〉
According to technical scheme 1 described unfolding type absorbent article, wherein, the consumption that is used in the hotmelt between above-mentioned hydrophobicity sheet and the above-mentioned non-woven fabric plate is 0.5～30.0g/m
2
(action effect)
The consumption of the hotmelt between each sheet is preferably 0.5～30.0g/m
2If the consumption in this scope then can prevent from can access the absorbent commodity of the back sheet for absorbent article with sense of touch excellence because of hot melt causes curing.And, when making back sheet, apply under the situation of embossing, can prevent reliably that hotmelt from overflowing or back sheet is wrapped on the knurling rolls, the disposable diaper of being made easily.
＜technical scheme 3 described inventions 〉
According to technical scheme 1 or 2 described unfolding type absorbent articles, wherein, folder is established after above-mentioned hotmelt carries out lamination between above-mentioned hydrophobicity sheet and above-mentioned non-woven fabric plate, makes above-mentioned non-woven fabric plate side be positioned at the protruding roller side of knurling rolls, when carrying out embossing processing, with they hot pressings.
(action effect)
The hydrophobicity sheet is difficult to attached on the heating knurling rolls, and the shop problem that twists on the knurling rolls significantly reduces.Its result can prevent the curing of hot melt, obtains having the absorbent commodity of the back sheet for absorbent article of sense of touch excellence.
And hotmelt is less from overflowing of non-woven fabrics, and can not be attached on the knurling rolls, and is therefore compared with the past, can use a large amount of hotmelts, therefore can improve two bonding strengths between the sheet.In addition, also can between two sheets, press from both sides and establish other non-woven fabric plates.
＜technical scheme 4 described inventions 〉
According to technical scheme 1～3 each described unfolding type absorbent thing, wherein, before above-mentioned hot pressing, between above-mentioned hydrophobicity sheet and non-woven fabric plate, folder is established the other materials sheet different with them on a part or whole part.
(action effect)
Establish the other materials sheet by folder, can access the absorbent commodity of back sheet with the abundant multiple structure of multiformity.Thus, for example, can form part and be folded with the bulk part of other materials sheet, and, can make the absorbent commodity of formation have the back sheet of the firm layer structure that interlayer is difficult to peel off.
＜technical scheme 5 described inventions 〉
According to technical scheme 4 described unfolding type absorbent articles, wherein, above-mentioned other materials sheet is the non-woven fabrics that is made of hydrophobic resin.
(action effect)
As the other materials sheet,, then can form to have and to guarantee all absorbent commodities of excellent back sheet of flexibility and each side such as bulk if use the non-woven fabrics that constitutes by hydrophobic resin.
＜technical scheme 6 described inventions 〉
According to technical scheme 4 or 5 described unfolding type absorbent articles, wherein, only above-mentioned hot pressing has been implemented at above-mentioned junction surface.
(action effect)
When carrying out hot pressing, the sense of touch of this part descends, but by only hot pressing being carried out at the junction surface, thereby can access the absorbent commodity of sense of touch excellence on the whole.
＜technical scheme 7 described inventions 〉
According to technical scheme 6 described unfolding type absorbent articles, it is characterized in that above-mentioned junction surface is made of the pair of right and left junction surface, this junction surface is in the center of width at least of product configured separate, and the joint of hook flooring on its separated part is not enough to use.
(action effect)
The junction surface of conventional disposable diaper is designed to width and expands towards both sides from the central part of the width at veutro middle part, but the central part of width is not used in joint basically.So, by width central authorities separated part is set, thereby will be suppressed at irreducible minimum because of the solidified scope of hot pressing at the junction surface, can access all absorbent commodities of going up the sense of touch excellence.
And, the junction surface of conventional disposable diaper is designed to width and expands towards both sides from the central part of the width at veutro middle part, so carrying out fastening people (hereinafter being called fastening person) is fastened to a restraint zone on the central part easily, perhaps, stride across or surpass central part, be fastened to another restraint zone side, sometimes restraint zone be fastened on such central part etc.
For example, the wearer is under child's the situation, rotates on the contrary with fastening person's intention sometimes, when carrying out terminal operation fast, so fastening situation might take place.And, fastening this people of person is under wearer's the situation, usually, and with a hand-held restraint zone, carry out fastening with the hand-held flank of another, at this moment, be close to sense in order to improve, under the most situation, both are drawn the back engages, at this moment, do not unclamp between the flank of a hand-held side, join near the central part.
And, like this on the central part or above engaging on the position of central part under the situation of restraint zone, under the most situation, need carry out terminal operation again, just over situation under, if the wearer continues dress at that, then be accompanied by wearer's activity, skew increases and might leak.
As this described invention, the junction surface is made of the pair of right and left junction surface, and this junction surface is in the center of width at least of product configured separate, and, when the joint of hook flooring on this separated part is not enough to use, be difficult to take place the problems referred to above.Thereby fastening person need not to operate again, is fastened to easily on the reliable position, can prevent wearer's leakage.
＜technical scheme 8 described inventions 〉
According to technical scheme 4～7 each described unfolding type absorbent articles, wherein, only on above-mentioned junction surface and periphery thereof, disposed above-mentioned other materials sheet.
(action effect)
To utilizing the other materials sheet to carry out carrying out hot pressing on the part of bulking, thereby the concavo-convex difference of hot pressing portion increases, and can form the junction surface of engaging power excellence.
＜technical scheme 9 described inventions 〉
According to technical scheme 1～8 each described unfolding type absorbent article, wherein, the coated pattern of above-mentioned hotmelt is that the predetermined space of being separated by on article fore-and-aft direction or width is provided with the pattern of the continuous coating line of multiple row, the width of above-mentioned coating line is 0.1～3mm, and the area more than 90% of above-mentioned hydrophobicity sheet is applied; Perhaps, the coated pattern of above-mentioned hotmelt is the pattern that the application point of point-like is arranged to diffusing point-like, and the area of above-mentioned application point is 0.05～5mm
2, and the area more than 90% of above-mentioned hydrophobicity sheet is applied.
(action effect)
As the coated pattern of hotmelt, as described in this, the pattern of wire or point-like is made easily, thereby preferred.And, can realize uniform coating, thereby the sense of touch of product increases.Especially, guaranteeing under the watertight situation described later, if total spreading area is very few, even then non-woven fabrics is from the screening fluidity height of body, also cause hiding liquid persistence deficiency easily, too small as if live width or some area, then no matter total spreading area or coating weight what, all cause hiding liquid persistence deficiency easily, wide as if live width or some area, then breathability worsens easily.Thereby, preferably in this described scope.In addition, " point-like of loosing " comprises two kinds of regularly arranged and irregular dispersions.
＜technical scheme 10 described inventions 〉
According to technical scheme 1～9 each described unfolding type absorbent article, wherein, above-mentioned hydrophobicity sheet is the non-woven fabrics that is made of hydrophobic resin, above-mentioned hotmelt is made of the water-insoluble thermoplastic resin, and at least in folder is established the scope of above-mentioned hotmelt the water pressure resistance of above-mentioned back sheet be more than the 400mmAq.
(action effect)
In the driftlessness band embodiment of the present invention, power concentrates on the junction of the hook flooring in the aforesaid back sheet, and back sheet is sometimes because of peeling off in the layer or splitting strips down from the hydrophobicity sheet.If such peeling off takes place, then fastening restraint zone is lax, or restraint zone gets loose, under this state, easily around abdomen or the gap that produces around the lower limb leak.This described invention is carried out in view of such problem, and the non-woven fabrics that will be made of hydrophobic resin is as the hydrophobicity sheet, thereby improves the interlaminar strength of the sheet that constitutes back sheet, and by water pressure resistance is made as 400mmAq, thereby the back of the body that prevents liquid leaks.Thus, when keeping flexibility and breathability, the hook element suitably joins on the outer load.
＜technical scheme 11 described inventions 〉
According to technical scheme 1～10 each described unfolding type absorbent article, wherein, the coating weight of the above-mentioned hotmelt in the above-mentioned junction surface is compared with other parts locally to be increased.
(action effect)
By on the bonding station at junction surface, increasing coating weight locally, thereby can improve the intensity of the bonding station at junction surface.
＜technical scheme 12 described inventions 〉
According to technical scheme 10 or 11 described unfolding type absorbent articles, wherein, the non-woven fabrics that uses in the above-mentioned hydrophobicity sheet is single-layer nonwoven or has 2 lamination non-woven fabrics with the upper strata that one deck is made of the fiber less than 1.2dtex (dtex) at least, and fiber basis weight is 15～25g/m
2More than.
(action effect)
For this described superfine or superfine fiber layer, because of the screening fluidity of itself is very high, for guaranteeing above-mentioned water pressure resistance, very preferably.Especially, the lamination non-woven fabrics has the advantage that can utilize other layers to protect low intensive superfine fibre layer, so very preferably.
＜technical scheme 13 described inventions 〉
A kind of manufacture method of back sheet for absorbent article, be used for being manufactured on the above-mentioned back sheet that the absorbent commodity that is folded with absorber between liquid permeability surface patch and the opaque liquid back sheet uses, wherein, folder is established after hotmelt carries out lamination between hydrophobicity sheet that is made of hydrophobic resin and non-woven fabric plate, with each sheet hot pressing, the peel strength under 40 ℃ during the sticking joint-trial of the circulation that this hotmelt is stipulated in JIS Z 0237 is tested is 0.0～5.0N/25mm.
(action effect)
Use the hotmelt of predetermined peel strength, hydrophobicity sheet and non-woven fabric plate is bonding, therefore can produce the back sheet of binding agent from the cohesive excellence of overflowing minimizing and each sheet of nonwoven cloth cover.
＜technical scheme 14 described inventions 〉
According to the manufacture method of technical scheme 13 described back sheet for absorbent article, when above-mentioned hot pressing, at embossing pressure 3～20kgf/cm
2When implementing embossing processing down, carry out above-mentioned hot pressing.
(action effect)
Embossing pressure is 3～20kgf/cm
2The time, form two sheets pressing and the excellent especially back sheet of sense of touch reliably.
The invention effect
According to the present invention, can not damage sense of touch and flexibility, and back sheet breakage can prevent from after stickup, to peel off restraint zone in the disposable diaper of driftlessness band the time.And, can prevent that when making back sheet because of hotmelt causes back sheet attached on the knurling rolls, the sense of touch that can also prevent shop problem and back sheet descends.
Description of drawings
Fig. 1 is a vertical view of watching the diaper deployed condition of first embodiment from the outer surface side.
Fig. 2 is a vertical view of watching the diaper deployed condition of second embodiment from the outer surface side.
Fig. 3 is the vertical view that preferred embossed pattern is shown.
Fig. 4 is the vertical view that other preferred embossed patterns are shown.
Fig. 5 is a vertical view of watching the diaper deployed condition of the 3rd embodiment from inner surface side.
Fig. 6 is the profile along the 2-2 line of Fig. 5.
Fig. 7 is the concept map of back sheet.
Fig. 8 is the vertical view that various coated patterns are shown.
Fig. 9 is the vertical view that various coated patterns are shown.
Figure 10 is the vertical view that various coated patterns are shown.
Figure 11 is the profile that various hook floorings are shown.
Figure 12 is the sketch map of the manufacturing installation of back sheet.
Description of reference numerals
X, X1, X2... hair side material piece, Y, Y1, Y2... hook flooring (fastening tape), Z, Z1, Z2... disposable diaper, 3... embossing processing unit (plant), the protruding knurling rolls of 3A..., 3B... rubber rollers, 5... coating machine, H... hot melt adhesive portion, 11... surface patch, 12... back sheet, 12A... hydrophobicity sheet, 12B, 12C... non-woven fabric plate, S1, S2... platen roller, 13... absorber.
The specific embodiment
The embodiment of＜unfolding type absorbent article (hereinafter, abbreviating absorbent commodity sometimes as) 〉
(first embodiment)
Fig. 1 is the expanded view that fastening-type disposable diaper Z of the present invention is shown.This disposable diaper Z possesses: the liquid permeability surface patch 11 that is positioned at user skin side; Be positioned at the opaque liquid back sheet 12 that liquid is seen through in the product outside; And be arranged at for example rectangle between them or be preferably the hourglass type and have to a certain degree inflexible absorber 13, in the portion of the limit, the left and right sides of drosal part, dispose the restraint zone Y1 of fastening usefulness, Y2.In the manner, restraint zone Y1, Y2 adopt the hook flooring of face button (surface fastener) to form, and the junction surface X-shaped that is used for engaging with the exposed division of this hook flooring is formed in the outer surface veutro portion of back sheet 12.
Back sheet 12 forms the general square shape wideer than absorber 13, outside the outer surface lamination of the hydrophobicity sheet 12A that constitutes by hydrophobic resin (non-polar resin), adorn and use non-woven fabric plate 12B, improving the skin contact, undertaken by hot pressing etc. bonding, thereby form back sheet 12.As the hydrophobic resin that uses among the hydrophobicity sheet 12A, resins such as preferably polyethylene (PE) or polypropylene (PP), polyethylene terephthalate olefin-based such as (PET), polyester system, polyamide-based, polyurethane series.As hydrophobicity sheet 12A, except membranaceous, also can use fiber assemblies such as non-woven fabrics, promptly back sheet 12 can be by will and adorning with bonding formation of non-woven fabric plate 12B lamination outward as the non-woven fabrics of hydrophobicity sheet 12A.The thickness of hydrophobicity sheet 12A or rigidity can suitably be selected according to known benchmark on the basis of the thickness of the non-woven fabric plate of considering to want lamination or rigidity etc.Non-woven fabrics as under the situation of hydrophobicity sheet 12A, as this non-woven fabrics, can be used and outer dress non-woven fabric plate 12B identical materials described later basically, still, needn't be identical materials, can independently select suitable material as required.
Outer dress can use the known non-woven fabric plate that uses with non-woven fabric plate 12B on the back sheet 12 of absorbent commodity Z, for example, wear into net method (air-through) by gas, point sticking method (pointbond), gas is worn into the net Method for bonding, jet net-spraying method, spun-bond process, hot sticky method, melt and spray (meltblown) method, the acupuncture type method of weaving cotton cloth, suitable processing methods such as thermal contraction method are to polyethylene (PE) or polypropylene (PP), polyethylene terephthalate olefin-based such as (PET), polyester system, polyamide-based, synthetic fibers such as polyurethane series or (PE)/(PET) wait this type of composite fibre, regenerated fiber such as artificial silk or ammonia copper wire, the fibre web of formations such as natural fiber such as cotton is processed the non-woven fabrics that obtains.In addition, in the processing method, jet net-spraying method flexibility, fold enrich aspect excellence; Hot sticky method bulk and flexibility enrich aspect excellence, can suitably select according to purpose.And, non-woven fabric plate can be the lamination non-woven fabric plate, for example can with the melt-blown nonwoven layer of cloth (M) that formed spun-bonded non-woven fabrics (S) layer of fibre web by spun-bond process and formed fibre web by meltblown suitably the non-woven fabrics lamination body and function that obtains more than 2 layers of lamination make material.
The fineness of the fiber that uses among the non-woven fabric plate 12B is preferably about 1.8～3.0 dtexs.The basic weight of non-woven fabric plate 12B is 10～100g/m
2, 15～50g/m more preferably
2About.Cross when low when the basic weight of non-woven fabric plate, can not fully keep the space of twining the hook flooring, and, peeling off restraint zone Y1, Y21, Y1, during Y22, non-woven fabric plate 12B destroys; When basic weight is too high, the production efficiency variation of non-woven fabric plate 12B, and it is remarkable that restraint zone Y1, Y21, Y1, Y22 are fastened to beyond the X of junction surface the situation on the position, thereby undesirable.
Back sheet 12 preferably constitutes possesses 0.5～4.0g/100cm
2Hr (restrains/100 centimetres
2Hour) moisture permeability.Preferably, on the position beyond the junction surface, fibrous ring, the fiber arch of adorning non-woven fabric plate 12B surface outward are closeer, do not engage with the hook flooring.
In the veutro scope that comprises junction surface X of sheet 12, further be folded with the intermediate layer non-woven fabric plate 12C that forms by non-woven fabric plate between sheet 12A, the 12B overleaf as the other materials sheet.Establish middle non-woven fabric plate 12C by folder, this position becomes bulk, with restraint zone Y1, Y21, Y1, Y22 are crimped onto junction surface X1, and being pressed into when X2 is last feels excellent, and, interlaminar strength improves, and can prevent along with restraint zone Y1 Y21, Y1, Y22 peels off after adhesion, adorns non-woven fabric plate 12B outward splitting takes place.As intermediate layer non-woven fabric plate 12C, can adopt basically and outer dress non-woven fabric plate 12B identical materials, but needn't necessarily adopt identical materials, can select suitable material etc. separately as required.On middle non-woven fabric plate 12C, stamp design or the pattern that becomes the Place object when fastening by modes such as printings, thereby can carry out visual identification from the outside via outer dress non-woven fabric plate 12B.And middle non-woven fabric plate 12C can be arranged to the identical size with outer dress non-woven fabric plate 12B.
It is desirable to, establish hydrophobicity sheet 12A in the portion and the peel strength of non-woven fabric plate 12B reaches 100～1500gf/25mm, preferably reach 200～1000gf/25mm at the folder of middle non-woven fabric plate 12C.In addition, peel strength can use cupping machine (AOUTGRAPHAGS-G100N that SHIMADZU company makes) to measure.Assay method is as follows: be made into the sample that is cut into 25mm * 130mm, peel off 5cm in advance along its length, mouth is peeled off in formation, under 20 ℃ of conditions, in the chuck spacing is that 50mm, draw speed are under the condition of 300mm/min, utilize cupping machine to peel off 30mm length, measure thus from the above-mentioned mouth of peeling off.As sample, make length direction and be product longitudinally sample and length direction be two kinds of the horizontal sample of product, measure respectively, the value that obtains is averaged as measured value.
Back sheet 12 adopts manufacture method manufacturing described later, be hydrophobicity sheet 12A and each non-woven fabric plate 12B, 12C is being folded with under the lamination state of hotmelt, adorn the mode that non-woven fabric plate 12B side is positioned at the protruding roller side of knurling rolls in addition and carry out embossing processing, each sheet lamination is bonding, form back sheet 12, the peel strength that the circulation that this hotmelt stipulate in JIS Z 0237 is glued under joint-trial 40 ℃ in testing is 0.0～5.0N/25mm.
In this back sheet 12, the preferred 0.05～0.50gcm of crooked measured value of KES
2/ cm, more preferably 0.10～0.45gcm
2/ cm most preferably is 0.20～0.40gcm
2/ cm.Measured value in the bend test of KES is 0.05gcm
2Under the situation below the/cm, too soft, so the stiffness of product disappears, can produce problems such as shrinkage when wearing.On the contrary, if surpass 0.50gcm
2/ cm, then the sense of touch in the product, flexibility are impaired.In addition, the crooked measured value of KES among the present invention is, (IPROS company makes: KES-FB-2AOUT-A), the sample that is cut into length 200mm, wide 200mm is arranged on the above-mentioned testing machine, with DFE sensitivity 20, curvature range 0.0～0.5cm to use the pure bending testing machine
-1Value when crooked.
The junction surface X of this form forms to process with embossing and forms by central part to the proper range of both sides of the veutro width (abdomen peripheral direction) of back sheet 12 being implemented suitable junction surface, in other words, is the part of the outer surface of back sheet 12.For example, with the back sheet of making 12, the mode that is positioned at protruding knurling rolls side with the non-woven fabric plate side offers embossing device, implementing junction surface formation thus processes with embossing, this embossing device possesses protruding knurling rolls and rubber rollers, be formed with junction surface embossing convex pattern on these protruding knurling rolls, this rubber rollers has the flexibility that the protuberance that can make opposed protruding knurling rolls with it is pressed into degree.Can also use the embossing device that possesses recessed knurling rolls, be formed with protuberance corresponding concave part on these recessed knurling rolls with protruding knurling rolls.And embossed patterns when making back sheet 12, in the knurling rolls only are arranged on the position corresponding with the junction surface, when making back sheet, form junction surface X.
, by giving embossing when forming junction surface X, be set at which degree herein, suitably set according to the basic weight of non-woven fabric plate and the formation of hook flooring for the embossing degree of depth, embossing density that will this moment.,, can adopt the known pattern that on this driftlessness banding pattern, forms herein, the pattern that MD (vertically) direction when preferably embossing is along the formation back sheet or CD (laterally) direction are arranged as the embossed pattern that give at the junction surface.Like this, usually when article of manufacture, become embossing alongst or the pattern arranged of width.And the CD direction of sheet is under the situation of product width direction especially overleaf, CD direction when embossed pattern is preferably embossing along the formation back sheet or the pattern that connects continuously.Under this situation, the fluffing of especially peeling off the splitting that causes, non-woven fabric plate after the adhesion of restraint zone is less.
And, especially under the situation of the peel strength when the hook flooring is fastened on non-woven fabric plate less than 200gf etc., might take place when wearing product that band comes off etc., so junction surface X preferably makes the peel strength when being fastened on the hook flooring on the non-woven fabric plate surpass 200gf.In addition, the peel strength when the hook flooring is fastened on the non-woven fabric plate surpasses under the situation of 1000gf, and strength required when adhering to the back disengaging increases, and product is very difficult to use.Therefore, non-woven fabric plate among the X of junction surface and the peel strength between the hook flooring are made as 100～1500gf/25mm, to be preferably 200～1000gf/25mm more suitable.Therefore, for on above-mentioned junction surface X splitting does not take place, hydrophobicity sheet 12A in the back sheet 12 and the bonding strength between the non-woven fabric plate 12B are set in the scope of junction surface X at least, be 100～1500gf/25mm, be preferably in the scope of 200～1000gf/25mm, and than non-woven fabric plate 12B among the X of junction surface and the big value of peel strength between the hook flooring.
Peel strength can use cupping machine (the AOUTGRAPH AGS-G100N that SHIMADZU company makes) to measure.Assay method is as follows: make the sample (back sheet) that is cut into 25mm * 130mm, peel off 5cm in advance along its length, mouth is peeled off in formation, under 20 ℃ of conditions, under the condition of chuck spacing 50mm, draw speed 300mm/min, utilize cupping machine to peel off 30mm length, measure thus from the above-mentioned mouth of peeling off.As sample, make length direction and be product longitudinally sample and length direction be two kinds on the horizontal sample of product, the value that records respectively is averaged as measured value.
In addition, junction surface X also can not adopt embossing processing, and adopts formation such as for example contact pin processing.The formation method of junction surface X can suitably adopt known method without departing from the present invention.
On the other hand, illustrate as the front, the position that is formed with this junction surface X is the three-decker that is folded with the intermediate layer non-woven fabric plate with back sheet 12, its intensity height and amount of binder are compared relative more with other parts, the bonding strength height of each sheet, even conciliate the dropout taut band so adhere to repeatedly, also be difficult to cause the back sheet breakage.
On the other hand, the width of surface patch 11 is bigger than absorber 13, extends to foreign side than the side 13s of absorber 13, at peripheral part of absorber 13, is bonded together with back sheet 12 by hotmelt etc.Surface patch 11 is worn into the various non-woven fabrics such as net non-woven fabrics, SMS non-woven fabrics, some bonded nonwoven except spun-bonded non-woven fabrics, gas, in the scope that can guarantee liquid permeability, can use plastic foils such as polyethylene film or with the lamination non-woven fabrics of plastic foil and non-woven fabrics lamination.And, can also use silk to carry out the Web materials that plain weave obtains to nylon, polyethylene terephthalate etc.
In the fiber assembly that constitutes by set fiber slurry or tow, include absorbable polymer, use coverings such as paper pulp sheet then, thereby form absorber 13.As the fiber that constitutes fiber assembly (hereinafter, abbreviate the fiber that constitutes tow as), can enumerate for example polysaccharide or derivatives thereof (cellulose, cellulose esters, chitin, chitosan etc.), synthetic high polymer (polyethylene, polypropylene, polyamide, polyester, lactamide, polyvinyl acetate etc.) etc., special preferred cellulose ester and cellulose.
As superabsorbent polymer, can use partial cross-linked polymer that obtains of water-swellable polymer such as the hydrolysate of carboxymethyl cellulose, polyacrylic acid and its esters, acrylate polymer cross-linking agent, starch-acrylate graft copolymer, starch-acrylonitrile graft copolymer, polyoxyethylene cross-linking agent, carboxymethyl cellulose crosslinked thing, poly(ethylene oxide), polyacrylamides, or preferably use copolymer of isobutene. and maleic acid etc.The caking capacity that causes in order to suppress the product moisture absorption can also use the material that has added anticaking agent.And, as superabsorbent polymer, variety of ways such as powder shaped, particle shape, graininess, coccoid, colloidal sol shape, suspension, gel, membranaceous, non-woven fabrics shape being arranged, these all can use in the present invention, especially preferably adopt particle shape form.
In addition, absorbent commodity of the present invention is not limited to this form.For example, can adopt middle elastic telescopic component configuration of using such as rubber band such as disposable diapers in the mode of each position.Can also adopt with purposes such as liquid diffusions, between surface patch and absorber, be provided with second mode.And middle non-woven fabric plate 12C and/or hot pressing portion extend to product width direction side portion in the flap portion of veutro, produce suitable waist on the flap of sidepiece, wear easily, thereby preferred.
(second embodiment)
Fig. 2 is the fastening-type disposable diaper Z1 that second embodiment relates to.The basic structure of this disposable diaper Z is identical with first embodiment, so for identical part, use identical symbol, omits explanation.
In second embodiment, adopt the mode be referred to as so-called driftlessness band, that is, the hair side material is not pasted on the back sheet, and the part of the outer surface of back sheet 12 itself is suitably implemented embossing processing, thereby form junction surface X1, X2.And on the sheet 12, in comprising the scope that is formed with junction surface X1, X2, dress is with disposing middle non-woven fabric plate 12C between non-woven fabric plate 12B and the hydrophobicity sheet 12A outside overleaf.
For the fastening restraint zone Y1 that uses in limit, the left and right sides portion that is configured in drosal part, Y2, except being bonded in the position on limit, the left and right sides, hook flooring (not shown) by the face button forms, in the outer surface veutro portion of the back sheet 12 that is used for the engage hook flooring, dispose X1 of left-interface portion that is used for fastening left side restraint zone Y1 and the X2 of left-interface portion that is used for fastening right side restraint zone Y2 respectively.
It is characterized in that these X1 of left-interface portion and junction surface, the right side X2 preset distance of on the width of product, being separated by.In addition, in the illustrated example, junction surface X1, the special preferred configuration of X2 is a rectangle, but is not limited to this especially.Also can be other shapes.
Junction surface X1, standoff distance between the X2 (distance of approaching part) L2 also with restraint zone Y1, the length of Y2 is relevant, for junction surface X1 is set, product width on the veutro length direction ora terminalis ST of X2 (hereinafter, product width is called this width) more than 1/2 of 5.0～500mm, or be more than 1/2 of product width direction size of hook flooring.If do not reach this scope, then visually be beyond recognition junction surface X1, X2 is separated, perhaps, when carrying out terminal operation fast, probably with restraint zone Y1, Y2 crosses product width direction centrage and is fastened on mistakenly on the junction surface opposite with corresponding engagement portion.For example, can not prevent from basically to join left side restraint zone Y1 on the X2 of junction surface, right side situation.In addition, as mentioned above, when middle non-woven fabric plate 12C and/or hot pressing portion extend to product width direction side portion, produce suitable waist on the flap of sidepiece, wear easily, so preferred.
On the other hand, though not shown, among the disposable diaper Z1 of the manner, dispose a plurality of on direction between restraint zone, prolong the rubber band of elastic extension, thereby constitute the restraint zone Y1 of dorsal part, scalable between the Y2.Thereby, the restraint zone Y1 when fastening, the fastening permissible range of Y2 enlarges, based on can enlarging by fastening permissible range of wearer's size difference.And by flexible, the sense of being close to of wearing the time also increases.Can also be in the following way, promptly do not make the restraint zone Y1 of dorsal part by rubber band, flexible between the Y2, and at restraint zone Y1, folder is established suitable extensible members such as elastomeric sheets between the leading section of Y2 and the cardinal extremity, and at the hook flooring of the extensible member of establishing than this folder near configuration plane button on the position of front, make restraint zone Y1, Y2 itself is flexible.In addition,, press from both sides extensible members such as establishing elastomeric sheets between the so-called flank part of Y2 and other parts, thereby constitute the restraint zone Y1 of dorsal part by at bonding restraint zone Y1, scalable between the Y2.Adopt this structure, also can access and be close to the effect that sense improves or the permissible range of size difference improves.In addition, for the expansion force of rubber band or extensible member, can in the scope that known disposable diaper adopted, design, and not have any problem.
Herein, constitute restraint zone Y1, the hook flooring of the face button of part or all of Y2 is made of hook plane materiel tablet, and this hook plane materiel tablet has fluffing shape protrusion-shaped elements (copulational protuberance) such as the hook-type that engages on the non-woven fabrics fiber that is wrapped in as the junction surface or mushroom swollen capitiform.The method of being made restraint zone by this hook plane materiel tablet adopts known method.Be not particularly limited.And, fluffing such as hook-type or mushroom swollen capitiform shape protrusion-shaped size of component, density etc., can according to and outer dress with the relation between the non-woven fabrics, in the scope of suitable peel strength, suitably select.
Restraint zone Y1, Y2 and junction surface X1, the suitable peel strength between the X2 is designed to 100gf～1500gf/25mm, is preferably 200gf～1000gf/25mm.If less than 100gf, then can not fully engage; If greater than 1500gf, then engaging force is strong excessively, and when peeling off after adhering to etc., the junction surface is easy to generate fluffing.In addition, in the present invention, be bonded on junction surface X1 in order not make the hook flooring, on the position between the X2, preferred peel strength is less than 100gf.
Herein, peel strength can use cupping machine (the AOUTGRAPH AGS-G100N that SHIMADZU company makes) to measure.The assay method of peel strength is as follows.With the strap broad ways doubling of width 50mm * length 100mm, form the doubling strap of width 25mm * length 100mm, with restraint zone Y1, Y2 sticks on the end of strap securely.At this moment, restraint zone Y1, the hook flooring of Y2 are positioned at the position than the close foreign side of front end of strap.
On the other hand, on stainless steel plateform, with the junction surface X1 of back sheet 12, X2 utilizes double-faced adhesive tape to paste as upper surface.In addition, with adhesive tape two ends are fixed.
Next, make restraint zone Y1, the hook flooring of Y2 and junction surface X1, after the X2 contact, the roller that utilizes quality 2kg comes and goes on them from the strap side, with restraint zone Y1, the hook flooring of Y2 and junction surface X1, X2 pressing.In addition, paste the 1kg that slings on the other end of opposition side at the restraint zone of strap and bear a heavy burden, kept 10 seconds, pressing is partly applied shearing force, the formation positive engagement.
With the anchor clamps of cupping machine the restraint zone of stainless steel flat plate and strap pasted opposition side other end clamping thereafter.At this moment, the draw direction that makes the restraint zone of clamping strap paste the anchor clamps of the opposition side other end becomes 90 ° with respect to stainless steel flat plate.
So that final peel angle becomes 90 ° mode, be set to anchor clamps on the cupping machine after, peel off the pressing part with the speed of 300mm/min, the concavo-convex weighted mean that be measured to this moment is made as peel strength.In addition, measured value is 3～10 times of effective measured value average.And during mensuration, sample is arranged to, and is determined as the mensuration of product width direction to the product width direction.In addition, the size of test film is as follows, and restraint zone Y1, the hook flooring of Y2 are 23.5 ± 1.5mm (product fore-and-aft direction) * 25mm (product width direction), and junction surface X1, X2 are 50mm (product fore-and-aft direction) * 130mm (width).
On the other hand, restraint zone Y1, Y2 and junction surface X1, the suitable shearing force between the X2 is designed to 1kg～10kg, preferred 3～8kg.During less than 1kg, joint is disengaged easily; Opposite if greater than 10kg, then engaged strong.In addition, the assay method of this shearing force is as follows.At first, on stainless steel plateform, with the junction surface X1 of back sheet 12, X2 pastes with double-faced adhesive tape as upper surface.In addition, with adhesive tape (craft tape) two ends are fixed.At this moment, the junction surface X1 of sheet 12 overleaf, the blank parts of residual stainless steel plateform around the X2.
Next, the hook flooring of restraint zone Y1, Y2 is touched after junction surface X1, the X2 of back sheet 12, utilize the roller of quality, come and go at their upper surfaces, with junction surface X1, the X2 pressing of hook flooring and the back sheet 12 of restraint zone Y1, Y2 from the strap side for 2kg.
, use the anchor clamps of cupping machine blank parts and restraint zone Y1 with stainless steel plateform, the end chucking of Y2 thereafter.At this moment, distance is made as 50mm between chuck.And if finish clamping like this, then with the draw speed of 30mm/min, along the junction surface X1 of hook flooring and back sheet 12, the shear direction stretching clamp of X2 is measured maximum shear stress.In addition, measured value is 3～10 times of effective measured value average.And during mensuration, sample is arranged to, and is determined as the mensuration of product width direction to the product width direction.In addition, the size of test film is as follows, and restraint zone Y1, the hook flooring of Y2 are 23.5 ± 1.5mm (product fore-and-aft direction) * 24mm (product width direction), and junction surface X1, X2 are 50mm (product fore-and-aft direction) * 130mm (width).
On the other hand, the junction surface form with the pattern of embossing can be described in first embodiment suitable setting.Especially, as shown in Figure 3, when embossing E when the product length direction disposes, retractility and breathability aspect around abdomen consider that this is preferred.Though also according to manufacture method and different, if consider normally MD direction with back sheet 12 be the method for making of product width direction as preferred method for making, the pattern of the CD direction when then the preferred embossing E of embossed pattern is along formation back sheet 12.Herein, in the present invention, along the setting of product length direction be not limited to be in line shown in the legend embossing E of shape, as shown in Figure 4, the embossing E of the long saw dentation that forms in product length direction side also belongs to along the embossing of product length direction.And though not shown, the product length direction also belongs to along the pattern of product length direction for the oval embossed pattern on long limit.As long as the length direction of embossing is along the product length direction.
(the 3rd embodiment)
Fig. 5 and Fig. 6 illustrate the disposable diaper Z2 of the 3rd embodiment.Fig. 6 is the profile along the 2-2 line of Fig. 5.This flat type disposable diaper 10 comprises: the back sheet 12 that constitutes the diaper outer surface; Be disposed at the liquid permeability surface patch 30 of skin face side; Be folded in the absorber 50 between outer load 12 and the surface patch 30; And be installed in restraint zone Y1 on the dorsal part both side ends of back sheet 12, Y2.Restraint zone Y1, fastening of Y2 is provided with hook flooring 130A, and when wearing diaper, with the restraint zone Y1 of dorsal part, the hook flooring 130A of Y2 joins any place of the ventral surface of back sheet 12 to.
(surface patch)
Surface patch 30 forms the rectangle wideer than absorbent cores 56, extends a little to foreign side than the side of absorbent cores 56, and is by hotmelt etc., fixing with back sheet 12.
As long as surface patch 30 has liquid permeability, for example, can use the non-woven fabrics of porose or atresia or porous plastic sheet etc.And the raw fibre of this non-woven fabrics is what is not particularly limited.For example, can enumerate olefin-based such as polyethylene, polypropylene; Synthetic fibers such as polyester system, polyamide-based, polyurethane series; Regenerated fiber such as artificial silk, ammonia copper wire; Natural fibers such as cotton etc., or use the two or more composite fibre from these materials, select, composite fibre etc.And then non-woven fabrics can be the non-woven fabrics that makes by any processing.As processing method, can the illustration known method, for example weave cotton cloth method, gas of jet net-spraying method, spun-bond process, hot sticky method, meltblown, acupuncture type worn into net method, some Method for bonding etc.For example, if pursue flexibility, fold, then preferred jet net-spraying method is if pursue bulkiness, flexibility, then preferred hot sticky method.
And surface patch 30 both can be to be made of 1 sheet, also can be that the laminated sheet that obtains by fitting two above sheets constitutes.Equally, on in-plane, surface patch 30 both can be made of 1 sheet, also can be made of two above sheets.
(intermediate)
For the liquid through surface patch 30 is shifted to absorbent cores rapidly, liquid penetration speed specific surface sheet 30 intermediates 40 fast, so-called " second " can be set between surface patch 30 and absorber 50.This intermediate 40 can not only make liquid shift and make absorbent properties height by absorbent cores to absorbent cores rapidly, and can prevent the liquid that the absorbed phenomenon from absorbent cores " backflow ", can make to be in drying regime on the surface patch 30 all the time.Intermediate 40 can omit.
As intermediate 40, can enumerate mixing tab, the bonding or crimped paper of point with surface patch 30 identical materials, jet net-spraying method non-woven fabrics, paper pulp non-woven fabrics, paper pulp and artificial silk.Preferred especially gas is worn into net non-woven fabrics and spun-bonded non-woven fabrics.
The intermediate 40 of diagram form both can be configured in central authorities than the width of absorbent cores 56 narrowly, also can be arranged in the whole width range.The length of the length direction of intermediate 40 can be identical with the length of absorbent cores 56, and also can only be in to absorb region of fluid is in the shorter length range at center.The representative material of intermediate 40 is the non-woven fabrics of liquid permeability excellence.
(stopping big envelope)
In order to stop on surface patch 30 urine or the soft stool that moves along laterally, prevent side leakage, what be arranged on outstanding (erecting) on the use face side in the both sides of product stops big envelope 60,60.
This stops that big envelope 60 is by constituting as the lower part: the successive barrier sheet 64 that is made of the water proofing property non-woven fabrics on width in fact; With the elastic telescopic parts 62 that are fixed on extended state on this barrier sheet 64.As these elastic telescopic parts 62, can use rubber band etc., except example is provided with many as shown in Figure 5 and Figure 6, also can be provided with 1 respectively.
On the inner surface of barrier sheet 64, with the isolating position of the side of surface patch 30 (also can be on the sidepiece of surface patch 30) on have set top, the part that is positioned at this side, set top anchors at the side of back sheet 12 by hotmelt etc.On this fixing part, between the sheet of barrier sheet 64 and back sheet 12 opposed parts, be respectively arranged with elastic telescopic parts 66 such as rubber band along fore-and-aft direction.
Around lower limb, stop big envelope 60 to erect end inboard for not being fixed on the free part of product self, this freedom part erects by the contractility of rubber band 62.Diaper is worn on the health with ship shape when wearing, so the contractility of rubber band 62 works, around lower limb, stops that big envelope 60 is by the contractility of rubber band 62 and erect.The space that is surrounded by rising portions forms the confined space of urine or soft stool.When urinating in this space, this urine is absorbed in the absorbent cores 56 by surface patch 30, and for the solid constituent of soft stool, and the rising portions that stops big envelope 60 becomes and stops, prevents that it from overflowing.And for the urine that erects the distal edge side leakage of the rising portions that overflow, the backstop function by the plane abutting part prevents side leakage.
(absorber)
Absorber 50 is the parts that absorb liquid such as keeping urine or soft stool.Absorber 50 has absorbent cores 56 and covering piece 58, and this covering piece 58 is with the back side at least and the side parcel of this absorbent cores 56.Covering piece 58 also can omit.In addition, in the diagram form, be provided with retention tab 80 between the rear side position (lower portion) of absorbent cores 56 and covering piece 58, but this retention tab 80 can be omitted also.The back side of absorber 50 is bonding by the inner surface of binding agents such as hotmelt and back sheet 12.
(absorbent cores)
As cellulose, can use cotton, velveteen, timber slurry etc. by deutero-cellulose of plant or Bacterial cellulose etc., also can use regenerated celluloses such as artificial silk, regenerated cellulose can be the fiber that has carried out spinning.
As the cellulose esters that can preferably adopt, can use for example organic acid esters such as cellulose acetate, cellulose butyrate, cellulose propionate; Nitration mixture esters such as cellulose acetate propionate, acetylbutyrylcellulose, cellulose acetate phthalate, nitric acid cellulose acetate; And cellulose esters derivant such as polycaprolactone grafting cellulose esters etc.These cellulose esters can separately or mix more than 2 kinds and use.The viscosity average polymerization degree of cellulose esters is 50～900 for example, is preferably about 200～800.The average substitution degree of cellulose esters is for for example 1.5～3.0 about (for example 2～3).
The average degree of polymerization of cellulose esters for example is about 10～1000, be preferably about 50～900, more preferably about 200～800, the average substitution degree of cellulose esters for example is about 1～3, be preferably about 1～2.15 more preferably about 1.1～2.0.The average substitution degree of cellulose esters can be selected from improving aspects such as biological degradability.
As cellulose esters, preferred organic acid esters (for example, carbon number is about 2～4 organic acid ester), preferred especially cellulose acetate.The degree of acetylation of cellulose acetate mostly is greatly about 43%～62%, and particularly when 30%～50% left and right sides, so the biological degradability excellence is preferred.Particularly preferred cellulose esters is a cellulose diacetate.
The fiber that constitutes tow also can contain various additives, for example thermostabilization agent, coloring agent, oil preparation, productive rate improving agent, whiteness improving agent etc.
The fineness that constitutes the fiber of tow for example can be set as 1～16 danier, is preferably 1～10 danier, more preferably 1～6 danier.The fiber that constitutes tow can be non-crinkled fibre.The degree of crispaturaing of crinkled fibre for example can be made as 5～75 of per inch, is preferably 10～50, more preferably about 15～50.And, the crinkled fibre that most employing is evenly crispaturaed.If the use crinkled fibre then can be made the absorbent cores of bulk and light weight, and can easily make the higher tow of integraty by interfibrous winding.The cross sectional shape that constitutes the fiber of tow is not particularly limited, and for example can be any one shape in circle, ellipse, abnormity (for example, Y word shape, X word shape, I word shape, R word shape etc.) or the hollow form etc.The fiber that constitutes tow uses with the form of following tow (fibre bundle), and described tow is by will be for example 1,000～1,000,000, is preferably the ultimate fibre pack about 2,000～1,000,000 and forms.Fibre bundle is preferably by with 1,000～1, the continuous fiber pack about 000,000 and constituting.
For the tulle of the tow of the preferred cellulose diacetate that uses among the present invention, on market, there is the product of Celanese company and Daicel chemical industry etc. to sell.The density of the tulle of the tow of cellulose diacetate is about 0.5g/cm
3, gross weight is 400～600kg.Extract tow from this tulle, and open the wide band shape of fine one-tenth by desired size and bulk degree, the fine width of opening of tow is arbitrarily, for example can be width 50～2000mm, and the width of the absorbent cores of preferred product is about 50～300mm.And,, can adjust the density of absorbent cores by adjusting the fine degree of opening of tow.
(superabsorbent polymer particle)
Preferably, as shown in Figure 6, comprise superabsorbent polymer particle 54 in the absorbent cores 56,54....And preferably on fluid storage zone at least, absorbable polymer particle (SAP particle) is dispersed in long filament 52 substantially along whole thickness direction, in the aggregation of 52....The portion's enlarged drawing of wanting of Fig. 6 conceptually illustrates along the dispersive substantially state of whole thickness direction.
Under not having the SAP particle on top, bottom and the pars intermedia of absorbent cores 56 or seldom situation is arranged also, can not be referred to as " disperseing " along whole thickness direction.Therefore, " disperse " the form in the aggregation that is dispersed in long filament along whole thickness direction " equably " along whole thickness direction, also be included in top, bottom and/or pars intermedia " inequality ", but the form that the each several part of top, bottom and pars intermedia all is dispersed with.And do not get rid of: part SAP particle is not penetrated into long filament 52 yet, in the aggregation of 52..., and remains in its surperficial form; Part SAP particle sees through long filament 52, and the aggregation of 52... is positioned at the form on the covering piece 58; Or be positioned at form on the retention tab 80.
As superabsorbent polymer particle 54, preferably using absorption speed is particle below 40 seconds.Absorption speed is during greater than 40 seconds, and the liquid that supply in the absorbent cores 56 flow back to outside the absorbent cores 56 easily, promptly are easy to generate so-called backflow.
And as superabsorbent polymer particle 54, preferably adopting gel strength is the above particle of 1000Pa.Thus, even under the situation that forms bulk absorbent cores 56, also can effectively suppress to absorb the sensation of stickness behind the liquid.
The unit are abundance of superabsorbent polymer particle 54 can suitably be determined according to the desired absorbtivity of the purposes of this absorbent cores 56.Therefore, cannot treat different things as the same, but can be set at 50～350g/m
2In the unit are abundance with polymer is 50g/m
2When following,, can prevent to adopt synthetic continuous fiber to be difficult to bring into play the lightweight effect because of the weight of polymer.If greater than 350g/m
2, then not only effect is saturated, and can cause uncomfortable grittiness because of the surplus of superabsorbent polymer particle 54.
If need, can adjust to the distribution density or the dispersion volume of superabsorbent polymer particle 54 on the in-plane of absorbent cores 56.For example, the dispersion volume at fluid drainage position can be more than other positions.If consider that the men and women is other, then men's article can improve the distribution density (amount) of front side, and lady's article can improve the distribution density (amount) of central part.And, also can on the in-plane of absorbent cores 56, the part that does not have polymer be set the part (for example point-like).
As required, can prepare the different multiple superabsorbent polymer particle 54 of particle size distribution, on thickness direction, supply with successively, can be at the little particle of downside distribution particle size distribution in the absorbent cores 56, the big particle of distribution particle size distribution on upside.
About the ratio of superabsorbent polymer particle 54 and continuous fiber absorption characteristic.As the weight ratio in the area of plane of directly bearing the 5cm * 5cm in the region of fluid on the absorbent cores 56, superabsorbent polymer particle/continuous fiber weight is preferably 1～14, and preferred especially 2～9.
(covering piece)
Use under the situation of covering piece 58, as its material, can use thin paper, particularly crimped paper, non-woven fabrics, multi-layer nonwoven fabrics, offer foraminate etc.But, the sheet that preferred superabsorbent polymer particle can not be deviate from.Using non-woven fabrics to substitute under the situation of crimped paper, SMMS (spunbond/as to melt and spray/meltblown/spunbonded) non-woven fabrics of special preferred hydrophilic, its material can be used polypropylene, polyethylene/polypropylene etc.Basic weight is preferably 5～40g/m
2, be preferably 10～30g/m especially
2
For this covering piece 58, except coating continuous fiber 52 shown in Figure 6, the aggregation of 52... and superabsorbent polymer particle 54 outside the mode of the whole layer of 54..., can also adopt the back side and the lateral mode that only coat this layer.In addition, though not shown, also can be in the following way: the upper surface of absorbent cores 56 and side cover with crimped paper or non-woven fabrics, the mode that lower surface covers with opaque liquid sheets such as polyethylene; The upper surface of absorbent cores 56 covers with crimped paper or non-woven fabrics, side and the following mode (these materials become the constitutive requirements of covering piece) that covers with opaque liquid sheets such as polyethylene.If necessary, can adopt with two-layer clamping continuous fiber 52 up and down the aggregation of 52... and superabsorbent polymer particle 54,54... the layer be configured or only below the configuration mode, but, owing to be difficult to prevent that superabsorbent polymer is particle migration, so be not ideal style.
(retention tab)
Be provided with under the situation of retention tab 80, between retention tab 80 and absorbent cores 56S upper surface, press from both sides by modes such as distributions and to establish superabsorbent polymer particle 54.When the aggregation of continuous fiber 52 is supplied with or in the step thereafter, perhaps in the process of circulation before consumer's use, superabsorbent polymer particle 54 penetrates the aggregation of continuous fiber 52 sometimes.The formed concavo-convex meeting of superabsorbent polymer population that has penetrated the aggregation of continuous fiber catches in consumer's use and causes uncomfortable grittiness when touching.At this, preferred mode has, and folder is established the retention tab 80 with the performance that keeps superabsorbent polymer 54 between absorbent cores 56 and covering piece 58.80 pairs of this retention tabs only depend on thin paper covering pieces 58 such as (crimped papers) to seem that insufficient stiffness strengthens, thereby alleviate or the hands when preventing that consumer from using touches sense of discomfort.
The material of retention tab 80 is not particularly limited, so long as can keep the material of superabsorbent polymer 54 to get final product.Specifically, for example, non-woven fabrics, the paper pulp of crispaturaing, low absorbefacient cotton fiber (for example, the cotton fiber after unskimmed cotton fiber, the defat, rayon fiber is handled and the fiber that obtains etc.), polyethylene fibre, polyester fiber, acrylic fiber, polypropylene fibre, silk, cotton, fiber crops, nylon, polyurethane, acetate fiber etc. with waterproofing agent or water-repelling agent.
Adopt under the situation of non-woven fabrics in retention tab 80, this retention tab 80 is 0.01～10.00gfcm/cm with the compression energy that the test based on KES records
2, be preferably 0.01～1.00gfcm/cm
2, and the elasticity of compression is 10%～100%, preferred 70%～100% non-woven fabrics is advisable.
As top mentioned, the reason that retention tab 80 is set is, to for example from absorbent cores 56 come off (deviating from) keep to the superabsorbent polymer 54 of below.Therefore, user contacts the superabsorbent polymer particle 54 that comes off via covering piece 58 with retention tab 80, so can not bring uncomfortable grittiness to user.The non-woven fabrics that particularly has the above-mentioned compression energy and the elasticity of compression can be given full play to this function.
And the superabsorbent polymer of deviating from 54 is kept by retention tab 60, can not move on covering piece 58, so can not produce the inequality of absorbability.Particularly, on retention tab 80, move in order to prevent superabsorbent polymer particle 54, can be in advance on retention tab 80 coating have fusible hotmelt etc.And, also can make matsurface, thereby prevent that superabsorbent polymer particle 54 from moving on retention tab 80 by upper surface (towards the face of the face of use side) with retention tab 80.As roughening or fluffing mode for this purpose, can enumerate that to form be not netted non-netted when making non-woven fabrics, carry out embossing processing, process with acupuncture type, brush processing etc.
Above-mentioned example is the example that retention tab 58 is set between the rear side position of absorbent cores 56 and covering piece 58, but retention tab also can be arranged on than covering piece 58 near rear side (this mode is not shown), in a word, as long as retention tab is arranged on the rear side of absorbent cores 56, just can alleviate or eliminate the grittiness of the discomfort when contacting from the product back side.
(restraint zone)
Restraint zone Y1, Y2 possesses: fastening base material 130C, its base portion is bonded on the diaper, and front does not fixedly form free end; And hook flooring 130A, it is bonded on the inner surface of this front.Fastening base material 130C can adopt formation such as plastics, multi-layer nonwoven fabrics, paper.Hook flooring 130A by adhesive bond on fastening base material 130C, not peelable.The outer surface side of hook flooring 130A has a plurality of copulational protuberance 130D.Shape as copulational protuberance 130D, as shown in figure 11, comprise (A) レ word shape, (B) J word shape, (C) mushroom, (D) T word shape, (E) two J word shape (with the mode bonded shape of J word shape copulational protuberance) etc., but can be arbitrary shape with back side alignment.The copulational protuberance 130D of the shape that fiber easily preferred and back sheet 12 twines, for example レ word shape, J word shape, T word shape, two J word shapes.Restraint zone Y1, Y2 are under Product Status, and folding to surface patch 30 sides, hook flooring 130A is bonded on the non-woven fabrics of side in strippable mode.
As being fixed with restraint zone Y1, the formation fiber of the outer dress non-woven fabrics 12B of the back sheet 12 of Y2, except olefin-based such as polyethylene or polypropylene, polyester system, synthetic fibers such as polyamide-based, can also use natural fibers such as regenerated fibers such as artificial silk or ammonia copper wire, cotton, can use by jet net-spraying method, spun-bond process, hot sticky method, gas and wear into net method, the acupuncture type non-woven fabrics that suitable processing methods such as method obtain of weaving cotton cloth.
On the peristome side of veutro, the inner surface side of sheet 12 is provided with restraint location demonstration sheet 74 overleaf, this restraint location shows on the sheet 74 have been implemented to become with restraint zone Y1 by printing etc., the design of the fastening Place object of hook flooring 130A of Y2 can be recognized from the outside by back sheet 12.In order to improve breathability, can omit restraint location and show sheet 74, but show the material of sheet 74, the preferred materials such as non-woven fabrics with breathability or paper that use as restraint location.
(elastic telescopic parts such as rubber band)
Flat type disposable diaper Z2 is by adjusting restraint zone Y1, the restraint location of Y2 is close on the health, so on the back sheet 12, elastic telescopic parts such as rubber band are set along the waist end or around the lower limb usually, and with position that absorber 50 overlaps on the elastic telescopic parts are not set, diagramatic way also adopts this structure.
(back sheet)
Back sheet 12 is to be used to support absorber 50 and to be worn in part on the wearer.Back sheet 12 forms the hourglass shape that the fore-and-aft direction central part of both sides shrinks, and becomes the position that wearer's lower limb enters here.The precalculated position of the inner surface side in the sheet 12 is provided with absorber 50 and surface patch 30 overleaf, fixes by binding agents such as hotmelts.And the predetermined position on the outer surface of back sheet 12 becomes junction surface X, and this junction surface X goes up and engages restraint zone Y1, the hook flooring 130A of Y2.Junction surface X has restraint zone Y1 among being positioned at dorsal part and veutro, the opposition side of Y2 one side, as long as and can engage hook flooring 130A, its position and size can be set arbitrarily.Generally, junction surface X is of a size of the rectangular extent of fore-and-aft direction length 20～80mm, width 150～300mm, fore-and-aft direction standoff distance on it between ora terminalis and the waist peristome is made as 0～60mm, especially is made as 20～50mm, and is positioned at the width central authorities of product.
As the explanation in first embodiment etc., the hydrophobicity sheet 12A of inner surface side and the non-woven fabric plate 12B of outer surface side are made as main body, and as required, folder is established the intermediate layer non-woven fabrics and is carried out lamination between them, undertaken by hotmelt H bonding, thereby constitute back sheet 12.In this 3rd embodiment, non-woven fabrics is used as hydrophobicity sheet 12A, thereby only constitute back sheet 12 with non-woven fabrics, the opaque liquid sheet of being made by resin moldings such as polyethylene films is not set between the outer surface of the inner surface of sheet 12 and absorber 50 overleaf, this mode is characterised in that, as the hotmelt H that is used for bonding hydrophobicity sheet 12A and non-woven fabric plate 12B, use the water-insoluble material, and will this water-insoluble hotmelt H be applied to back sheet 12 with absorber 50 eclipsed part and peripheral part thereof, thereby make the water pressure resistance of coated portion reach more than the 400mmAq.Fig. 7 (a) (b) illustrates an example of back sheet 12 respectively.Water pressure resistance hides liquid persistence deficiency during less than 400mmAq, and liquid component spills at leisure, even wearing in the time of setting usually, also can leak.Water pressure resistance is preferably 700～1000mmAq.When water pressure resistance was too high, breathability might descend, so undesirable.
As long as have the water pressure resistance in this scope, kind that the non-woven fabrics of formation hydrophobicity sheet 12A and outer dress are used non-woven fabrics 12B and the kind of water-soluble hot melt resin H are unqualified, as non-woven fabrics 12A, 12B can use by the fiber less than 1.2dtex, particularly 0.5～0.9dtex to constitute and fiber basis weight is 15g/m
2More than, be in particular 20～25g/m
2Single-layer nonwoven, perhaps fiber basis weight is 10g/m
2More than, be in particular 15～25g/m
2Melt spraying non-woven fabrics.And preferred non-woven fabrics 12A, 12B be, constitutes by the fibrous layer more than 2 is carried out lamination, and one deck is by constituting less than 1.2dtex, the fiber that is in particular 0.5～0.9dtex at least, and its fiber basis weight is 15g/m
2More than, be in particular 18～22g/m
2The lamination non-woven fabrics; Perhaps, the fiber basis weight that meltblown layer is contained in the intermediate layer is 10g/m
2More than, be in particular 15～25g/m
2SMS non-woven fabrics, particularly SMMS non-woven fabrics etc. have the non-woven fabrics of multilamellar meltblown layer.Non-woven fabrics 12A, the fiber of 12B is thick excessively, and fiber basis weight is very few, and when increasing the coating weight of thermoplastic resin H, hiding fluidity still might be not enough.If non-woven fabrics 12A, the fiber of 12B is meticulous, undercapacity then, and sheet 70 might be damaged.If non-woven fabrics 12A, the fiber basis weight of 12B is too much, and then rigidity, weight unnecessarily increase, and might cause wearing feeling to worsen.As whole back sheet 12, preferred basis weights is 15～50g/m
2, and thickness be 0.01～0.5mm.And the non-woven fabrics and the outer dress that form hydrophobicity sheet 12A can use identical materials basically with non-woven fabrics 12B, but need not necessarily to use identical materials, can select suitable material etc. separately as required.
Especially, ideal formation is, overlapping hydrophobicity sheet 12A and non-woven fabric plate 12B on the sheet 12 overleaf, H is bonded to each other with sheet via the water-insoluble thermoplastic resin, and, the elastic telescopic parts are fixed on two sheet 12A with extended state, between the 12B, by its contractility, back sheet 12 is close on the wearer.Under this situation, water-insoluble thermoplastic resin H not only plays the function of the screening fluidity that improves back sheet 12, also plays function that hydrophobicity sheet 12A and non-woven fabric plate 12B are engaged and the elastic telescopic parts are fixed on function between hydrophobicity sheet 12A and the non-woven fabric plate 12B.As the elastic telescopic parts, can use the ribbon of rubber band or elastic foam etc., preferably that rubber band is concentrated or a plurality of across the space configuration.
As water-insoluble thermoplastic resin H, can use in this technical field as water-fast material, for example AFX-088A (manufacturing of ニ Star Off イ Application De レ イ company) among the general material of hotmelt.And,, can use hydrophilic resin as water-insoluble thermoplastic resin H.
As long as water-insoluble thermoplastic resin H is coated on any one face of hydrophobicity sheet 12A and non-woven fabric plate 12B, but also can be coated on surface and this two sides, the back side.But, preferably be coated on the face that is not exposed to the outside.
The coating weight of water-insoluble thermoplastic resin H can suitably be set, and adopts under the situation of non-woven fabrics of above-mentioned fineness and basic weight, will guarantee in the water-proof scope preferred 5～30g/m at least
2More than, preferred especially 8～10g/m
2If the coating weight deficiency, then liquid permeates at leisure, so might cause hiding liquid persistence deficiency.If coating weight is too much, then breathability might descend, and cost performance descends, so undesirable.
Coated pattern as water-insoluble thermoplastic resin H, be not particularly limited, can adopt known coating methods such as an act formula coating, spiral coating, spiral fiber spray gun coating (dwindling the mode of spiral spacer), slit coating, pattern rule or irregular all can, but preferably can be with the regular pattern coating adhesive.
As particularly preferred pattern, aspect from property easy to manufacture, preferred Fig. 7 (a) pattern that the predetermined space of being separated by on diaper fore-and-aft direction or the width is provided with the continuous coating line H of multiple row that is shown in, the perhaps application point H of point-like be arranged to the to loose pattern of point-like shown in Fig. 7 (b), under this situation, preferred total bond area is more than 90% and less than 100%, and the live width W of coating line H () is that the area (a bit) of 0.1～3mm or application point H is 0.05～5mm
2If total spreading area is very few, even non-woven fabrics 12A then, the screening fluidity of 12B self is high again, and it is still not enough easily to hide the liquid persistence; If live width or some area are narrow excessively, then no matter total spreading area, coating weight what, hide the liquid persistence and all become not enough easily; Wide as if live width or some area, then breathability worsens easily.Particularly preferred scope is, total spreading area is 95%～97%, and the width of coating line H is 1～2mm, and the area of application point H is 2～4mm
2
Particularly, it is desirable to, on the junction surface X of sheet 12, compare overleaf, increase the coating weight of water-insoluble thermoplastic resin H partly, relatively improve hook flooring 130A with respect to the durability of peeling off with other parts.As this concrete grammar, except the method for dual coating water-insoluble thermoplastic resin H, can also adopt and not repeat coating, and increase the method for coating weight partly.
The junction surface X of sheet 12 goes up under the situation of dual coating water-insoluble thermoplastic resin H overleaf, its coated pattern can suitably be determined, in order further to improve intensity, preferably the pattern of coating forms earlier, the predetermined space of being separated by on diaper fore-and-aft direction or width is provided with the pattern of the continuous coating line of multiple row, or the application point of point-like be arranged to the to loose pattern of point-like, the pattern of back coating is formed the pattern that intersects with the pattern that is coated with earlier.These pattern application can wait and realize by helical pattern, the coating of curtain formula, slot scraping (bead) coating of for example spiral coating, the coating of spiral fiber spray gun etc.
Fig. 8～Figure 10 illustrates the combination example of various patterns.In the example shown in Figure 8, the pattern as being coated with has earlier adopted the predetermined space of being separated by on the diaper fore-and-aft direction that the linear pattern of continuous coating line H is set; In the example shown in Figure 9, the pattern as being coated with has earlier adopted the predetermined space of being separated by on the diaper width that the linear pattern of continuous coating line H is set; In the example shown in Figure 10,, adopted the pattern of the application point H of point-like being arranged to diffusing point-like as the pattern that is coated with earlier.
And, in the example of these Fig. 8～shown in Figure 10, (a) among the figure, pattern as the back coating, adopted following pattern, that is, along the bevel direction that intersects with diaper fore-and-aft direction or width many coating line Hs are set abreast, and the many inclined-plane mesh shape patterns that become the symmetric coating line Hs of line with respect to the diaper fore-and-aft direction are set abreast.And (b) among the figure, the pattern as the back coating has adopted helical pattern Hp such as spiral coating, the coating of spiral fiber spray gun.And, (d) among the figure,, adopted the pattern of 2 wavy coating line Hw that phase shifting 180 degree are set as the pattern of back coating.In addition, (e) among the figure,, adopt the pattern that many wavy coating line Hw are set abreast as the pattern of back coating.In addition, (f) among the figure,, adopt the pattern of the coating line Hc that many concentric circles are set as the pattern of back coating.
In addition, among (c) figure in Fig. 8 and the example shown in Figure 9,, adopted application point Hd with point-like be arranged to the to loose pattern of point-like as the pattern of back coating.And among (c) figure among the example shown in Figure 10, the pattern as the back coating has adopted the predetermined space of being separated by on the diaper fore-and-aft direction that the linear pattern of a plurality of continuous coating line Hf is set; (g) among the figure, the pattern as the back coating has adopted the predetermined space of being separated by on the diaper width that the linear pattern of a plurality of continuous coating line Hk is set.
(other)
In addition, though not shown, each component parts of diaper can wait fixing each other by coating on the spot, slot scraping coating, spiral coating or the coating of spiral fiber spray gun of hotmelt etc.And, within the scope of the invention, can in this 3rd embodiment, adopt the part of other embodiments to constitute, also the part formation of this 3rd embodiment can be applied in other embodiments.
The embodiment of the manufacture method of＜back sheet 〉
Next, with reference to accompanying drawing, describe the embodiment of the manufacture method of back sheet in detail.Figure 12 is the sketch map of the manufacture method of back sheet for absorbent article of the present invention.During manufacturing, at first, use coating machine 5 or spreading machine, on the continuous flaky hydrophobicity sheet 12A that the leading portion from platen roller S1 etc. transports, dispose hotmelt H continuously or intermittently.Next, the continuous flaky non-woven fabric plate 12B overlay configuration that will transport from the leading portion of platen roller S2 etc. is being provided with on the hydrophobicity sheet 12A of hotmelt H, establishes under the state of hot melt adhesive material at folder between two sheets, with two sheet laminations.
Though it is not shown, be set between hydrophobicity sheet and the non-woven fabric plate but will press from both sides in the mode of a part or whole part by non-woven fabrics or film formed other materials sheet, in the case, the non-woven fabric plate of the other materials sheet that superposeed in advance can be supplied with from platen roller, also other continuous other materials sheet can be between hydrophobicity sheet and non-woven fabric plate, supplied with.Under the situation of part configuration, as long as the continuous other materials sheet intermittence ground that will supply with cuts off.With sheet merely during multiple stratification, can be according to existing technology implementation.In addition, under this situation, between other materials sheet and the non-woven fabric plate hotmelt can be set, also hotmelt can be set, hotmelt preferably is set.
As hydrophobicity sheet 12A, non-woven fabric plate 12B, other materials sheet 12C, can use and the material identical materials described in first～the 3rd example.
The coating weight of the hotmelt H that uses between hydrophobicity sheet 12A and non-woven fabric plate 12B is 0.5～30.0g/m
2, be preferably 1.0～25.0g/m
2, be preferably 3.0～15.0g/m especially
2In addition, using the other materials sheet to constitute under the multiwalled situation, the hot melt adhesive dosage between top layer and the backing layer is preferably in this scope.Less than 0.5g/m
2The time, can not get the effect of binding agent; Coating weight is greater than 30.0g/m
2The time, the flexibility of back sheet 12 is impaired.
And the coating machine 5 that is used for coated heat melt adhesive H can use known coating machines such as slit coating machine, curtain coating machine.And, can adopt the method for scattering hotmelt to be coated with, or use spray nozzle to scatter to be coated with.Coating method is not particularly limited.
Adopt the laminated sheet 12 ' of this mode lamination to be provided for embossing processing unit (plant) 3, implement embossing processing, with each sheet hot pressing of institute's lamination, this embossing processing unit (plant) 3 has the protruding knurling rolls 3A that is formed with embossing usefulness protuberance on whole.In addition, in the manner, adopted knurling rolls, but the present invention also can not use knurling rolls, and carry out hot pressing by simple hot-rolling.And, mainly illustrated in the present embodiment knurling rolls are used as the unitary mode of hot pressing, but the hot pressing unit among the present invention is not limited to use the mode of knurling rolls, for example can adopt ultrasound wave bonding.
Embossing processing is meant, utilizes protruding knurling rolls 3A that non-woven fabric plate 12B side is pushed.With the opposed roller 3B of protruding knurling rolls 3A can be the recessed knurling rolls that are formed with the protuberance corresponding concave part of protruding knurling rolls, also can be to possess the rubber rollers that the protuberance that can make protruding knurling rolls is pressed into the flexibility of degree, this is not particularly limited.The bounding point area of the protuberance of protruding knurling rolls is that the embossing area is 5%～50%, is preferably 5%～40%, is preferably 10%～30% especially.The embossing area is less than 5% o'clock, and the bonding force deficiency greater than 50% o'clock, is implemented the sheet hardening that obtains after embossing is handled, might cause sense of touch impaired.
And the embossing pressure that embossing adds man-hour is preferably 3～20kgf/cm
2Less than 3kgf/cm
2The time, under the situation of the coating weight of binding agent in above-mentioned scope, the bonding deficiency between hydrophobicity sheet 12A and the non-woven fabric plate 12B; Greater than 20kgf/cm
2The time, non-woven fabric plate 12B solidifies, and might cause its sense of touch impaired.In addition, embossing pressure also brings influence to process velocity, so can suitably change not breaking away from the scope of the inventive concept.
Herein, for example, when being used for the back sheet as the disposable diaper of absorbent commodity, the peel strength between hydrophobicity sheet 12A and the non-woven fabric plate 12B reaches the degree that substantially can not peel off.That is, combination securely makes when peeling off obstinately, can cause the back sheet breakage.Even it is also identical under the situation that is folded with other materials sheet 12C.
Embodiment
In the manufacture method that the present invention relates to (embodiment) and other manufacture methods (comparative example), test whether being wound up on the knurling rolls.Result of the test is listed in the table below 1.
Test following carrying out, use the hotmelt of rerum natura shown in the following table 1, will be with basic weight 20g/m
2The gas of making wear into the polyethylene diaphragm of net non-woven fabric plate (PE/PET) and thickness 25 μ m bonding after, utilize knurling rolls to apply embossing.
The embossing condition enactment is as follows: embossing pressure 7kgf/cm
2, gap 0.3mm, sheet gait of march 165m/min, 0.9 second/sheet of pressing time, uninterrupted working time 20 hours.As evaluation, measure and be wound on the number of times that knurling rolls are discharged side.
[table 1]
| The hotmelt title | Hotmelt is formed | The sticking joint-trial of circulation is tested (25 ℃) (N/25mm) | The sticking joint-trial of circulation is tested (40 ℃) (N/25mm) | Softening point (℃) | 160 ℃ of melt viscosities (mPaS) | Coiling on the knurling rolls (inferior) | |
| |
ME100 | The SBS Petropols are paraffin series | No | No | 84 | 3700 | 0 |
| |
AFX-402 | The SBS oil is a paraffin series | No | 2.3 | 88 | 5300 | 0 |
| Comparative example 1 | JM5236WZP | The SIS+SBS oil is a paraffin series | 5.5 | 5.5 | 95 | 6800 | 9 |
| Comparative example 2 | ME190E | The SIS+SBS Petropols be natural modified be paraffin series | 12.5 | 12.5 | 83 | 3700 | 15 |
| Comparative example 3 | JM5215WZP | SIS+SBS block polymerization body oil is a paraffin series | 24.5 | 24.5 | 93 | 5188 | 18 |
As shown in table 1, in the manufacture method that the present invention relates to (embodiment), can not be wound up on the knurling rolls, in other manufacture methods (comparative example), confirm coiling.This result shows, prevented coiling on knurling rolls by the present invention.
, it should be noted softening point that each example relates to and the 160 degree melt viscosities and the no dependency relation of reeling herein in the table 1.Under the high situation of viscosity under, the temperature when especially applying embossing low, originally think and to reel, but shown in top result of the test, in fact do not have what relation at melt viscosity height, softening point.And, during the sticking joint-trial of circulation is tested, be not to have the coiling of the hotmelt of concavo-convex knurling rolls when applying embossing as index.And the special meaning of this result of the test is, the result of the peel strength in testing according to the sticking joint-trial of circulation under different with the temperature that applies embossing 40 ℃ can know the occurrence scope of the coiling of inhibition when the nonwoven cloth cover overflows and apply embossing.
Next, make to have or not embossing, embossing ratio, have or not hotmelt to have nothing in common with each other, make the embodiment and the comparative example of the present application, measure bending value, the bonding strength of this KES, and estimate flexibility etc.Each embodiment and comparative example are respectively following 3 kinds of modes: for example, and will be with basic weight 20g/m
2The gas of making is worn into the polyethylene diaphragm of net non-woven fabric plate (PE/PET) and thickness 25 μ m, only uses the adherent mode of hotmelt; Only use the adherent mode of embossing; Thereby apply embossing with knurling rolls with hotmelt after bonding and carry out adherent mode.Belong to other details such as the consumption of which mode, hotmelt or embossing amount for each embodiment and comparative example, shown in following table 2.Condition when in addition, applying embossing is embossing pressure 7kgf/cm
2, gap 0.3mm, sheet gait of march 165m/min, 0.9 second/sheet of pressing time.
Herein, the crooked measured value of KES is as follows, (IPROS company makes: KES-FB-2AOUT-A), the sample that is cut into length 200mm, width 200mm is placed on the above-mentioned testing machine, measures DFE sensitivity 20, curvature range 0.0～0.5cm to use the pure bending testing machine
-1Following value when crooked.
And sensory evaluation is as follows: when touching with hands, experimenter's reality feels that softish sample is zero, and the sample of sensation shortcoming flexibility is evaluated as *.
In addition, the bonding strength between diaphragm and the non-woven fabric plate (A) uses cupping machine (the AOUTGRAPH AGS-G100N that SHIMADZU company makes) to measure.Assay method is as follows, making is cut into the sample (back sheet) of 25mm * 130mm, pass through cold spray, to peel off 5cm along its length in advance, under 20 ℃ condition, with the condition of chuck spacing 50mm, draw speed 300mm/min, be determined in the tension test bonding strength of peeling off when mouthful peeling off 30mm length from above-mentioned (peel strength).In addition, measured value is following to be obtained: as sample, make length direction and be product longitudinally sample and length direction be two kinds on the horizontal sample of product, measure respectively, the value that obtains is obtained meansigma methods, as measured value.
And, the following mensuration of peel strength (B) between non-woven fabric plate and the hook flooring, after stack is cut into the hook flooring of same size on being cut into the sample of 50mm * 130mm (back sheet), the roller of 2kg is rolled in the above, the hook flooring is expressed on the non-woven fabric plate, further on shear direction, increases the weight of 1kg, continued for 10 seconds, make the engaging of non-woven fabric plate and hook flooring, be made into test film.And, adopt the identical mode of mensuration with bonding strength (A), measure this sample, calculate measured value.
[table 2]
As shown in Table 2, by this test, unfolding type absorbent article of the present invention is compared with comparative example, needn't worry that peeling off when fastening can cause splitting, and, demonstrate excellent flexibility.
Industrial applicibility
Disposable diaper of the present invention can be used as flat type disposable diaper.
And, manufacture method of the present invention, can be used for the manufacturing of the back sheet of other absorbent commodities such as flat type disposable diaper, Breeches type disposable diaper, sanitary napkin or diaper, further, can also be used for the disposable products such as operating coat, packing timber, particularly need the manufacturing of the outer load that opaque liquid product good and the skin contact sense uses.
Claims (14)
1. unfolding type absorbent article, it possesses liquid permeability surface patch, opaque liquid back sheet and is folded in two absorbers between the sheet, in limit, the left and right sides portion of any one party of dorsal part or veutro portion, be provided with restraint zone, part or all of this restraint zone formed by the hook flooring of face button, this hook flooring is joined on the junction surface of being located between veutro portion or the drosal part left and right sides limit portion, to wear, described unfolding type absorbent article is characterised in that
Above-mentioned back sheet is that folder is established after hotmelt carries out lamination between hydrophobicity sheet that is made of hydrophobic resin and the non-woven fabric plate that constitutes above-mentioned article outer surface, implementing hot pressing forms, the bonding strength of above-mentioned hydrophobicity sheet and the non-woven fabric plate peel strength height when tightening above-mentioned hook flooring at non-woven fabric plate, and the measured value in the bend test of KES is 0.05～0.50gcm
2/ cm.
2. unfolding type absorbent article according to claim 1, wherein, the consumption that is used in the hotmelt between above-mentioned hydrophobicity sheet and the above-mentioned non-woven fabric plate is 0.5～30.0g/m
2
3. unfolding type absorbent article according to claim 1 and 2, wherein, folder is established after above-mentioned hotmelt carries out lamination between above-mentioned hydrophobicity sheet and above-mentioned non-woven fabric plate, makes above-mentioned non-woven fabric plate side be positioned at the protruding roller side of knurling rolls, when carrying out embossing processing, with they hot pressings.
4. according to each described unfolding type absorbent thing of claim 1～3, wherein, before above-mentioned hot pressing, between above-mentioned hydrophobicity sheet and non-woven fabric plate, folder is established the other materials sheet different with them on a part or whole part.
5. unfolding type absorbent article according to claim 4, wherein, above-mentioned other materials sheet is the non-woven fabrics that is made of hydrophobic resin.
6. according to claim 4 or 5 described unfolding type absorbent articles, wherein, only above-mentioned hot pressing has been implemented at above-mentioned junction surface.
7. unfolding type absorbent article according to claim 6 is characterized in that above-mentioned junction surface is made of the pair of right and left junction surface, and this junction surface is in the center of width at least of product configured separate, and the joint of hook flooring on its separated part is not enough to use.
8. according to each described unfolding type absorbent article of claim 4～7, wherein, only on above-mentioned junction surface and periphery thereof, disposed above-mentioned other materials sheet.
9. according to each described unfolding type absorbent article of claim 1～8, wherein, the coated pattern of above-mentioned hotmelt is that the predetermined space of being separated by on article fore-and-aft direction or width is provided with the pattern of the continuous coating line of multiple row, the width of above-mentioned coating line is 0.1～3mm, and the area more than 90% of above-mentioned hydrophobicity sheet is applied; Perhaps,
The coated pattern of above-mentioned hotmelt is the pattern that the application point of point-like is arranged to diffusing point-like, and the area of above-mentioned application point is 0.05～5mm
2, and the area more than 90% of above-mentioned hydrophobicity sheet is applied.
10. according to each described unfolding type absorbent article of claim 1～9, wherein, above-mentioned hydrophobicity sheet is the non-woven fabrics that is made of hydrophobic resin, above-mentioned hotmelt is made of the water-insoluble thermoplastic resin, and at least in folder is established the scope of above-mentioned hotmelt the water pressure resistance of above-mentioned back sheet be more than the 400mmAq.
11. according to each described unfolding type absorbent article of claim 1～10, wherein, the coating weight of the above-mentioned hotmelt in the above-mentioned junction surface is compared with other parts locally to be increased.
12. according to claim 10 or 11 described unfolding type absorbent articles, wherein, the non-woven fabrics that uses in the above-mentioned hydrophobicity sheet is single-layer nonwoven or has 2 lamination non-woven fabrics with the upper strata that one deck is made of the fiber less than 1.2 dtexs at least, and fiber basis weight is 15～25g/m
2More than.
13. the manufacture method of a back sheet for absorbent article is used for being manufactured on the above-mentioned back sheet that the absorbent commodity that is folded with absorber between liquid permeability surface patch and the opaque liquid back sheet uses, wherein,
Folder is established after hotmelt carries out lamination between hydrophobicity sheet that is made of hydrophobic resin and non-woven fabric plate, with each sheet hot pressing, the peel strength under 40 ℃ during the sticking joint-trial of the circulation that this hotmelt is stipulated in JIS Z 0237 is tested is 0.0～5.0N/25mm.
14. the manufacture method of back sheet for absorbent article according to claim 13 is when above-mentioned hot pressing, at embossing pressure 3～20kgf/cm
2When implementing embossing processing down, carry out above-mentioned hot pressing.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP101164/2006 | 2006-03-31 | ||
| JP2006101164 | 2006-03-31 | ||
| JP152845/2006 | 2006-05-31 | ||
| JP152844/2006 | 2006-05-31 |
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| Publication Number | Publication Date |
|---|---|
| CN101410080A true CN101410080A (en) | 2009-04-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007800114335A Pending CN101410080A (en) | 2006-03-31 | 2007-03-30 | Unfolding type absorbent article and process for producing back sheet for absorbent article |
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| CN (1) | CN101410080A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102600025A (en) * | 2012-03-16 | 2012-07-25 | 厦门兰海贸易有限公司 | Polymer composite core for paper diaper and preparation method of polymer composite core |
| CN102711703A (en) * | 2009-11-06 | 2012-10-03 | 科罗佐包装业与贸易有限公司 | High-strength loop piece formed to be used on the straps of diapers for babies and adults |
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2007
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| CN102711703A (en) * | 2009-11-06 | 2012-10-03 | 科罗佐包装业与贸易有限公司 | High-strength loop piece formed to be used on the straps of diapers for babies and adults |
| CN102711703B (en) * | 2009-11-06 | 2017-03-01 | 科罗佐包装业与贸易有限公司 | For the high intensity ring plate on baby and adult diaper band |
| US9622921B2 (en) | 2011-05-20 | 2017-04-18 | Unicharm Corporation | Absorbent article with topsheet, top-layer sheet and compressing portions |
| CN103781450A (en) * | 2011-08-26 | 2014-05-07 | 尤妮佳股份有限公司 | Disposable diaper |
| CN103781450B (en) * | 2011-08-26 | 2016-01-20 | 尤妮佳股份有限公司 | Disposable diaper |
| US9439818B2 (en) | 2011-08-26 | 2016-09-13 | Unicharm Corporation | Disposable diaper |
| CN102600025A (en) * | 2012-03-16 | 2012-07-25 | 厦门兰海贸易有限公司 | Polymer composite core for paper diaper and preparation method of polymer composite core |
| CN104394824A (en) * | 2012-06-29 | 2015-03-04 | 宝洁公司 | Wearable article with outwardmost layer of multicomponent fiber nonwoven providing enhanced mechanical features |
| US10596045B2 (en) | 2015-06-22 | 2020-03-24 | Zuiko Corporation | Composite stretchable member, wearable article, and method for producing wearable article |
| CN107848244A (en) * | 2015-06-22 | 2018-03-27 | 株式会社瑞光 | The manufacture method of composite extensible member, dress article and dress article |
| CN107848244B (en) * | 2015-06-22 | 2020-06-16 | 株式会社瑞光 | Composite stretch member, wearing article, and method for manufacturing wearing article |
| CN108138407A (en) * | 2015-09-29 | 2018-06-08 | 日东电工株式会社 | Layered articles |
| CN107260401A (en) * | 2016-03-30 | 2017-10-20 | 大王制纸株式会社 | The stretching structure and its manufacture method of absorbent commodity |
| CN107260401B (en) * | 2016-03-30 | 2021-03-19 | 大王制纸株式会社 | Stretchable structure of absorbent article and method for manufacturing same |
| CN107874915A (en) * | 2016-09-30 | 2018-04-06 | 大王制纸株式会社 | The method of attaching of disposable shorts and apertured nonwoven cloth |
| CN107874915B (en) * | 2016-09-30 | 2021-10-26 | 大王制纸株式会社 | Disposable wearing article and method for attaching perforated nonwoven fabric |
| CN109419585A (en) * | 2017-08-30 | 2019-03-05 | 尤妮佳股份有限公司 | Absorbent commodity manufacturing equipment and absorbent commodity manufacturing method |
| CN115105299A (en) * | 2021-03-19 | 2022-09-27 | 法麦凯尼柯数据股份公司 | Transversely stretchable continuous elastic laminate and method for producing the same |
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