CN1221232C

CN1221232C - Disposable diaper

Info

Publication number: CN1221232C
Application number: CNB001306685A
Authority: CN
Inventors: 铃木尚美; 湊大尚; 白石留美子
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 1999-08-27
Filing date: 2000-08-25
Publication date: 2005-10-05
Anticipated expiration: 2020-08-25
Also published as: JP3592591B2; JP2001061888A; TW475426U; ID27095A; KR100706042B1; MY120853A; CN1286971A; KR20010021411A

Abstract

To form a pocket without attaching an end sheet. A first area 23 extending crosswise while being spaced apart longitudinally outwardly from the end edge 4b of a core 4 by the required dimension and a second area 24 extending crosswise between the end edge 4b of the core 4 and the first area 23 are defined in the rear girth area 22 of a diaper, the rigidity of the second area 24 being lower than that of the first area 23 and that of a third area in which the core 4 intervenes. The longitudinal end 6c of a cuff 6 is secured on the first area 23 and the first area 23 is drawn in the direction of the third area 25 by the contraction of the cuff 6.

Description

Disposable diaper

Technical field

The present invention relates to be used to absorb the disposable diaper that keeps slop.

Background technology

Te Kaiping 10-328234 communique discloses to have: between top flat and egative film, insert and put wick and mutually over the ground separatedly to a pair of leakproof flange of longitudinal extension, and in forward and backward waistline district and between the leakproof flange to the disposable diaper of the pair of end portions flange of horizontal extension.The end flange has: be fixed in anchor portion on the top flat along the both ends in forward and backward waistline district, towards the inboard opposed free end of diaper be fixed in both side edges portion on the leakproof flange, elastomeric element is contained on the free end under elongation state.On this diaper by forming top flat and end flange pocket, so that prevent the Excreta that spills from the diaper front and back end to diaper longitudinal medial opening.

The disclosed diaper of Te Kaiping 10-328234 communique is because of the pocket that forms side opening in diaper in pro-, the waistline district, back, so have to the end flange is contained in the forward and backward waistline district.Because the pushing of the forward and backward waistline of diaper district is subjected to wearer's abdominal part and back when wearing diaper, and top flat and end flange are being pasted mutually, thereby stops up pocket.

Summary of the invention

The purpose of this invention is to provide a kind of not be used in that forward and backward waistline district mounting end sheet just can form pocket when wearing, be not easy blocked diaper with this pocket.

In order to address the above problem, the present invention has improved disposable diaper, this diaper constitutes the lamination sheet by the top flat of liquid permeability, the egative film of opaque liquid and the wick that is clipped between these two, above-mentioned lamination sheet has: preceding waistline district, back waistline district, crotch district between above-mentioned forward and backward waistline district, be positioned at the outside of both side edges of above-mentioned wick and a pair of flap that extends along the longitudinal direction and near the both side edges of above-mentioned wick to above-mentioned longitudinal extension and have a flange that above the lamination sheet, erects a pair of leakproof of tendency by elastic retractility;

With improve relevant the invention is characterized in: at least be divided in one of above-mentioned front and back waist district from the ora terminalis of above-mentioned wick horizontal expansion to separate along above-mentioned vertical outside required size and to first district of above-mentioned horizontal expansion and the ora terminalis of above-mentioned wick horizontal expansion and above-mentioned the 1st district to the 2nd district of horizontal extension, the rigidity in above-mentioned the 2nd district is lower than being positioned at above-mentioned the 1st district and accompanying the rigidity in the 3rd zone of above-mentioned wick, be contraction, above-mentioned the 1st district pulled to the 3rd district and before making being positioned at of above-mentioned bottom of s trouser leg flange above-mentioned by above-mentioned flange, the longitudinal end in back waistline district is fixed in the 1 district in above-mentioned the 1st district and above-mentioned the 2nd district at least.

An example as the invention process form, there is the relation in above-mentioned the 1st, 3 districts＞above-mentioned the 2nd district in the rigidity in above-mentioned the 1st～3 district, the stiffness of measuring according to Curley (ガ-レ-) method is the scope of 0.05～0.5mg in above-mentioned the 3rd district, the scope that is 0.1～2.0mg in above-mentioned the 1st district, the scope that is 0.01～0.2mg in above-mentioned the 2nd district, the above-mentioned flange section of downcutting from above-mentioned diaper are elongated to 93.3% o'clock required tensile force of vertical total length of above-mentioned section in the scope of 20～300gf.

As another example of the invention process form, the longitudinal size in above-mentioned the 1st district is the scope of 10～70mm, and the longitudinal size in above-mentioned the 2nd district is the scope of 5～70mm.

As an example of the invention process form, the longitudinal end of above-mentioned flange is bonding under the state of above-mentioned lamination sheet inboard in lodging.

Another example as the invention process form, in above-mentioned the 1st district, but the lamellar polyurethane foam of elastic telescopic, the synthetic rubber foam, but any one is fixed under elongation state between above-mentioned top flat and the above-mentioned egative film in the urethane membrane of lipoprotein of polystyrene foam, polyurethane thin film or elastic telescopic.

Description of drawings

Fig. 1 is the local disrumpent feelings oblique view of disposable diaper.

Fig. 2 is the cutaway view of looking along the A-A line arrow of Fig. 1.

Fig. 3 is the plane graph of diaper among Fig. 1.

Fig. 4 is the cutaway view of B-B line among Fig. 3.

The specific embodiment

Describe the disposable diaper relevant with reference to the accompanying drawings in detail with the present invention.

Fig. 1,2 is respectively the local disrumpent feelings oblique view of diaper and the cutaway view of looking along the A-A line arrow of Fig. 1.

Diaper is by the egative film 3 of the top flat 2 with liquid permeability, opaque liquid with between top flat 2 and egative film 3, and the lamination sheet 1 that is bonded on the wick 4 at least one inner face in these two

sheets

2,3 at least constitutes.

Lamination sheet 1 has preceding waistline district 20, waistline district 22, back and the crotch district 21 between these two waistline districts 20,22 in the vertical.Lamination sheet 1 has: be positioned at the wick 4 both side edges 4a outside and to a pair of flap 5 of the longitudinal extension of lamination sheet 1 with to the longitudinal extension of lamination sheet 1 and a pair of leakproof flange 6 of the tendency of erecting is arranged to the top of lamination sheet 1.

Leave required size and to the 1st zone 23 of the horizontal expansion of lamination sheet 1 with between the ora terminalis 4b of wick 4 and the 1st district 23 and to vertical foreign side forming in the back waistline district 22 of lamination sheet 1 to the 2nd district 24 of the horizontal expansion of lamination sheet 1 from the ora terminalis 4b of wick 4.On lamination sheet 1, in the 1st district 23 and accompany and form the pocket P1 of the 2nd district 24 between the 3rd district of wick 4 to lamination sheet 1 longitudinal medial opening, and the pocket P2 of the 2nd district 24 and flange 6 side opening in lamination sheet 1 horizontal.

In the back waistline district 22 of lamination sheet 1, a pair of banded fixture 10 that base end part is contained on the lamination sheet 1 extends to the horizontal inboard of lamination sheet 1.In the preceding waistline district 20 of lamination sheet 1, the rectangular target bar 11 of the fixed area of banded fixture 10 is contained on the outside of egative film 3.

Flap 5 is arc shaped to the horizontal inboard of lamination sheet 1 and extends in crotch district 21.On flap 5, the elastic component 7 that lower limb encloses district's usefulness is clipped at least one side's who is bonded in these two

sheets

2,3 between top flat 2 and the egative film 3 and under elongation state the inner face.

Flange 6 has: be bonded on the outside of top flat 2 and to the fixedly side edge part 6a of the longitudinal extension of lamination 1, relative with fixing side edge part 6a and to the free side edge part 6b of longitudinal extension be positioned at vertical both ends 6c in the forward and backward waistline district 20,22 of lamination sheet 1.Elastic component 8 is under the state that is coated on the free side edge part 6b and be installed on the flange 6 under the elongation state.In waistline district, back 22, the longitudinal end 6c of flange 6 be fixed in the 1st district 23 with state to the lodging of the inboard of lamination sheet 1 and from the 1st district 23 on the end edge portion in the back waistline district 22 of vertical outside extension of lamination 1.The state of the longitudinal end 6c of pro-waistline district 20 upper overturnings 6 in lamination sheet 1 inboard that lodges is bonded in the end edge portion (see figure 3) in waistline district 20.Size between the longitudinal end 6c of the flange 6 when the contractility of resistance elastic component 8 makes from flange 6 to longitudinal tensile strain is preferably in the scope of 450～530mm, and fixedly the size between side edge part 6a and the free side edge part 6b is preferably in the scope of 20～50mm.

The 1st district 23 constitutes by the part of the part of top flat 2, egative film 3 with at the elastic component 9 between these two 2, a part of 3.Elastic component 9 is laterally telescopic along lamination sheet 1, and is fixed under elongation state on a part of inner face of these two sheets 2,3.The 2nd district 24 is made of the part of top flat 2 and the part of egative film 3, and these two 2, the inner face of a part of 3 are bonding mutually.Because in the 2nd district 24, do not have elastic component 9 and wick 4, so the stiffness in the 2nd district 24 is lower than the stiffness in the 1st district 23 and the 3rd district 25.

Contraction owing to elastic component 8 in waistline district, back 22 makes the free end 6b of flange 6 shrink to the longitudinal medial of lamination sheet 1, in 23 close the 3rd districts 25, the 1st district, 23 to the 3 districts 25, the 1st district lift highly to lamination sheet top, thereby, between the 1st district 23 and the 3rd district 25, form ladder.

In the 2nd district 24, the position 24a that is arranged in the 1st district 23 sides erects the formation barrier upward, so as to cover lamination sheet 1 above, position 24a and be positioned at the pocket portion P1 of the position 24b formation of the 3rd district 25 sides simultaneously to the longitudinal medial opening of lamination sheet 1.Because the P1 of pocket portion is recessed to the below of lamination sheet 1, so even wearer's buttocks from the top pushing pocket P1 of lamination sheet 1, can not blocked pocket P1 yet.

In Fig. 1, the inner face that makes lamination sheet 1 to the state of buckling, after the elongation state of

elastic component

7,8,9 is removed, is forming fold for medially on waistline district, back 22, flap 5 and flange 6.

Fig. 3 is the plane graph of diaper shown in Fig. 1, and according to the values of stiffness that cantilever method is measured, the 3rd district 25 is preferably in the scope of 0.05～0.5mg, and the 1st district 23 is preferably in the scope of 0.1～2.0mg, and the 2nd district 24 is preferably the scope of 0.01～0.2mg.As long as the rigidity in the 1st district 23 and the 3rd district 25 in these

districts

23,24,25 is than the rigidity height in the 2nd district 24, can be in the upper limit of above-mentioned values of stiffness and lower limit suitable selection values of stiffness.

When the stiffening value in the 1st district 23 less than 0.1mg, the stiffening value in the 3rd district 25 is during less than 0.05mg, then the free side edge part 6b of flange 6 is when the longitudinal medial of lamination sheet 1 shrinks, 25 the vertical contractions in the 1st district 23 and the 3rd district to lamination sheet 1, between the 1st district 23 and the 3rd district 25, ladder can not be produced, in the 2nd district 24, often pocket P1 can not be formed.During less than 0.01mg, then, often can not keep the shape of pocket P1 as the rigidity in the 2nd district 24 because most folds gather the 2nd district 24.

If the rigidity in the 1st district 23 surpasses 2.0mg, the rigidity in the 3rd district 25 surpasses 0.5mg, then these two distinguish 23,25 will be to the wearer with hard sensation, thereby reduced the adherent feeling of lamination 1.If the rigidity in the 2nd district 24 surpasses 0.2mg, even then shrink to the longitudinal medial of lamination 1 at the free edge 6b of flange 6, the 2nd district 24 is still withstood always, and can not the 1st district 23 be drawn to the direction in the 3rd district 25, often can not form pocket P1 in the 2nd district 24.

Contain the flange 6 of elastic component 8 and make the scope of the 93.3% o'clock needed tensile force of section along the longitudinal tensile strain of cutting into slices to total length of flange 6 from 1 cutting-out of lamination sheet, be preferably in the scope of 30～50gf at 20～300gf.If the tensile force of section is less than 20gf, then because the rigidity in the 2nd district 24 even bottom of s trouser leg flange 6 shrinks to the longitudinal medial of lamination sheet 1, also often can not pull to the 1st district 23 direction in the 3rd district 25.If the tensile force of section surpasses 300gf, though according to the rigidity in the 1st, 2

districts

23,24 difference, lamination sheet 1 makes the 1st district 23 lodge to the 3rd district 25 in 24 bendings of the 2nd district sometimes, makes the 1st district of must turning back when lamination sheet 1 wears.

At this, so-called tensile force is to use the tensile force of cupping machine to testing machine stretching section in 93.3% o'clock of the stretching section total length of vertically will cutting into slices, and in other words, is meant the contractility of section at this moment.The mensuration of tensile force is carried out by the following method.Flange 6 fixedly side edge part 6a and vertically both ends 6c downcut flange 6 from top flat 2, to longitudinal tensile strain the time the scope of total length 450～530mm, lateral dimension in the section of the flange 6 of 20～50mm scope as sample.Vertical both ends of the section of the contraction state that the contraction by elastic component 8 is caused are clipped on the chuck of testing machine with the size of 10mm roughly, make section extend 93.3% of its total length under the speed of 100mm/min, remove elongation state then.Make for the second time section be stretched to 93.3% of its total length, measure the power that at this moment is added on the testing machine.So-called section elongation 93.3% is meant that in the section total length be under the situation of 450mm, and the section elongation is that the 420mm that length overall deducts behind the about 20mm of the size of being clamped by chuck multiply by 93.3% the promptly about 400mm of value.

The longitudinal size L1 in the 1st district 23 is preferably in the scope of 20～50mm in the scope of 10～70mm.The longitudinal size L2 in the 2nd district 24 is preferably in the scope of 15～30mm in the scope of 5～70mm.

If the size L1 in the 1st district 23 is less than 10mm, the area in the 1st district 23 that contacts with wearers skin when then wearing because of lamination sheet 1 is too small, so, Excreta is spilt between wearer's skin and the 1st district 23.If the size L2 in the 2nd district 24 is less than 5mm, even then form ladder between the 2nd district 24 and the 3rd district 25, the 2nd district 24 also only becomes the barrier that erects to the top of lamination sheet 1, and can not form pocket P1.

The size L1 in the 1st district 23 is as surpassing 70mm, then in order to maintain the Excreta absorption function of lamination sheet 1 limited naturally on the longitudinal size, and the 3rd district 25 is reduced, so the size L2 in the 2nd district 24 must reduce, this often makes the size L2 in the 2nd district 24 become less than 5mm.Otherwise, if the size L2 in the 2nd district 24 surpasses 70mm, then must reduce the size in the 1st district 23, this size L1 that often makes the 1st district 23 is less than 10mm, if size L1, the L2 in the 1st district 23 and the 2nd district 24 are greater than 70mm, then the shared ratio of the

size

23,24 in lamination sheet 1 the 1st, 2 districts on the whole is very big, and the 3rd district 25 then becomes too small, so the Excreta absorbability that lamination sheet 1 is had obviously descends.

Fig. 4 is the profile along the B-B line of Fig. 3.Top flat 2 terminates near the outside of elastic component lateral margin, and the part of egative film 3 and flange 6 is further extended to foreign side sidelong from the lateral margin of top flat 2.The longitudinal end 6C of flange 6 is fixed on the outside of top flat 2 in the 1st district 23, and the inner face of the part of egative film 3 and flange 6 is fixed in mutually on the flap 5.

Top flat 2 adopts hydrophobicity non-woven fabrics of handling through hydrophilizing agent or the fibroplastic hydrophilic non-woven of being advanced hydrophilizing agent by white silk.Also small opening can be set on these non-woven fabrics.

Egative film 3 and flange 6 also can be with laminations of film of synthetic resin or film of synthetic resin and hydrophobicity non-woven fabrics etc.Flange 6 can also use the banded elastic telescopic sheet of above-mentioned tensile force in 20～300gf scope except with these sheet stocks.Under the situation of using the elastic telescopic sheet, flange 6 is being contained under the longitudinal tensile strain state on the lamination sheet 1, can saving the installation on the free lateral margin 6b of 8 pairs of bottom of s trouser leg flange 6 of elastic component.

Wick 4 is mixture of wood pulps and superabsorbent polymer beads, it is compressed to needed thickness after, whole wick covers with liquid permeability sheets such as thin papers.

But but can use any in the urethane ester film of flaky polyurethane foam, synthetic rubber foam, polystyrene foam or elastic telescopic of elastic telescopic as being contained in elastic component 9 in the 1st district 23.In the 1st district 23 except these elastic components 9 are installed, can also between top flat 2 and egative film 3, apply banded hot-melt adhesive, as improving inflexible means.In addition, can also be placed on some rhizoid shape flexible members between top flat 2 and the egative film 3, again thread flexible member is bonded in and makes it to form banded in these two 2,3 at least one side, or the banded plastic sheet of non-retractility is interposed between top flat 2 and the egative film 3 again plastic sheet is bonded at least one side in these two 2,3.

At the joint of wick 4,

elastic component

7,8 and 9 bonding and install, the aspect such as bonding of

sheet

2,3 and bottom of s trouser leg flange 6 except using cement such as hot glue and bonding agent, can also use hot melt to apply technology.

Also can also can under the condition that is bonded in than the more close vertical outside of the ora terminalis 4b of wick 4 in the 1st district 23, be bonded in the 2nd district 24 the end 6c of each flange 6 to being bonded under the outside of the lamination sheet 1 lodging state in the 1st district 23.In Fig. 3, though extend to the lateral outer side edge than the more close lamination sheet 1 of fixedly side edge part 6a of flange 6 in the 1st district 23, two that also can be formed on bottom of s trouser leg flange 6 at least fixedly between the lateral margin 6a.

According to the present invention, also can be except waistline district, back 22, perhaps with waistline district, back 22, form the 1st, 2

districts

23,24 in the pro-waistline district 20, formation is to the pocket P1 of the longitudinal medial opening of lamination sheet 1 and the pocket P2 of opening to the inside sidelong in pro-, the waistline district, back 20,22.

According to the disposable diaper relevant with the present invention, any one goes up the 1st district that forms in the direction in the 3rd district that pulls to the wick place by the flange contraction pro-, waistline district, back, form ladder between the 1st district and the 3rd district, the 2nd district between the 1st district and the 3rd district forms to the pocket of the longitudinal medial opening of diaper and the pocket of opening to the inside sidelong.Therefore, there is no need to resemble and end flaps is installed in the forward and backward waistline district the above-mentioned diaper of the prior art in order to form pocket.

Because the pocket to diaper longitudinal medial opening is recessed to the below of diaper, so even wearer's buttocks from the top of diaper to pressing down pocket, pocket can not blocked yet.

Because in the 1st district and the 3rd district, form ladder, the 1st district that is positioned at than more close diaper top, the 3rd district is closely contacted with wearer's skin, so can prevent to produce the gap between the end in pro-, waistline district, back and the wearer's skin, thereby improve the ability that prevents leakage of exudates.

Claims

1, a kind of disposable diaper, this diaper constitutes the lamination sheet by the egative film of the top flat of liquid permeability, opaque liquid and the wick between these two and constitutes, above-mentioned lamination sheet has: preceding waistline district, back waistline district, crotch district between above-mentioned forward and backward waistline district is positioned at the outside of both side edges of above-mentioned wick and a pair of flap that extends along the longitudinal direction and has the flange that erects a pair of leakproof of tendency above the lamination sheet near the both side edges of above-mentioned wick to above-mentioned longitudinal extension and by elastic retractility;

It is characterized in that: mark off at least one side in above-mentioned front and back waist district from the ora terminalis of above-mentioned wick horizontal expansion to separate along above-mentioned vertical outside required size and to first district of above-mentioned horizontal expansion and between the ora terminalis of above-mentioned wick horizontal expansion and above-mentioned the 1st district to the 2nd district of horizontal extension, the rigidity in above-mentioned the 2nd district is lower with the rigidity in the 3rd zone that accompanies above-mentioned wick than being folded in above-mentioned the 1st district, contraction by above-mentioned flange, above-mentioned the 1st district is pulled to before thereby the 3rd district will be positioned at above-mentioned flange, the longitudinal end in back waistline district is fixed in the 1 district in above-mentioned the 1st district and above-mentioned the 2nd district at least

There is the relation in above-mentioned the 1st, 3 districts＞above-mentioned the 2nd district in the rigidity in above-mentioned the 1st～3 district, the scope that the values of stiffness of measuring according to the Curley method is 0.05～0.5mg in above-mentioned the 3rd district, the scope that is 0.01～2.0mg in above-mentioned the 2nd district, cut into slices in the scope of 99.3% o'clock required tensile force at 20～300gf of vertical total length of extending above-mentioned section from the above-mentioned bottom of s trouser leg flange that contains elastic component that above-mentioned diaper downcuts

The longitudinal size in above-mentioned the 1st district is the scope of 10～70mm, and the longitudinal size in above-mentioned the 2nd district is the scope of 5～70mm.

2, the diaper of putting down in writing as claim 1 is characterized in that: the longitudinal end of above-mentioned flange under the state of swinging to above-mentioned lamination sheet inboard by affixed.

3, as claim 1 or 2 diapers of being put down in writing, it is characterized in that: in above-mentioned the 1st district, but but any one is fixed under elongation state between above-mentioned top flat and the above-mentioned egative film in the urethane ester film of the flaky polyurethane foam of elastic telescopic, synthetic rubber foam, polystyrene foam or elastic telescopic.