CN100512784C - Surface sheet of absorptive article - Google Patents
Surface sheet of absorptive article Download PDFInfo
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- CN100512784C CN100512784C CNB2005100652519A CN200510065251A CN100512784C CN 100512784 C CN100512784 C CN 100512784C CN B2005100652519 A CNB2005100652519 A CN B2005100652519A CN 200510065251 A CN200510065251 A CN 200510065251A CN 100512784 C CN100512784 C CN 100512784C
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- liquid
- water
- fiber
- upper strata
- lower floor
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
- E04H17/1413—Post-and-rail fences, e.g. without vertical cross-members
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H17/00—Fencing, e.g. fences, enclosures, corrals
- E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
- E04H17/1413—Post-and-rail fences, e.g. without vertical cross-members
- E04H17/1447—Details of connections between rails and posts
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Absorbent Articles And Supports Therefor (AREA)
- Nonwoven Fabrics (AREA)
Abstract
This surface sheet of the absorbent article comprises a laminated nonwoven fabric 20 having an upper layer 21 to be disposed on the skin side and a lower layer 22 to be disposed on the absorbent body 4 side. Before liquid permeation, the hydrophilicity of the lower layer 22 is made almost the same as or higher than that of the upper layer 21, but after liquid permeation, the hydrophilicity of the upper layer 21 becomes higher than that of the lower layer 22.
Description
Technical field
The present invention relates to the preferred surface patch that uses in absorbent commodity such as sanitary towel, sanitary pad, incontinence pad, disposable diaper and contact skin face thereof.
Background technology
For the surface patch of absorbent commodities such as sanitary towel and disposable diaper, requirement can make human body ejections such as menses and urine shift to absorber unobstructedly, and requires to prevent to be absorbed the allow liquids (the wet back of the body, wet back) of bulk absorption.
Open the 2002-065738 communique with reference to the spy, it has proposed to have upper strata that is configured in the skin side and the surface patch that is configured in the lower floor that absorbs the side as the surface patch of absorbent article, wherein the water-wetness of lower floor is than upper strata Geng Gao, and for the liquid of the hydrophilic oil preparation of the hydrophiling of the formation fiber that is used for lower floor, durability is than the higher surface patch of durability of the hydrophilic oil preparation of the hydrophiling of the formation fiber that is used for the upper strata.By this surface patch, the commitment after using beginning by the water-wetness gradient between the upper and lower, can make liquid shift to absorber unobstructedly.
Yet, at first, water-wetness is compared the water-wetness on low upper strata after the liquid of the amount of a certain degree sees through surface patch with lower floor, further reduce, so have following problem: be difficult to be drawn in the surface patch to the liquid on the surface patch, can not make liquid shift to absorber and flow to the surface patch surface unobstructedly with discharging (supply).In addition, after even the liquid of the amount of a certain degree sees through surface patch, owing to compare with the upper strata, lower floor keeps higher water-wetness, so particularly make a large amount of Liquid Absorption in situation of absorber etc., liquid may bleed back to lower floor from absorber, bleeds back to the surface of surface patch further.
Summary of the invention
The object of the present invention is to provide the permeability that in use can stably keep liquid, can in use prevent the Surface runoff of liquid and the surface patch of the wet back of the body for a long time, and the absorbent commodity that uses described surface patch.
The present invention is by providing the surface patch of following absorbent commodity, thereby realize described purpose, this surface patch constitutes by having upper strata that is configured in the skin side and the stacked non-woven fabrics that is configured in the lower floor that absorbs the side, wherein, before liquid sees through, the water-wetness of described lower floor than the water-wetness on described upper strata higher or with the water-wetness on described upper strata about equally; After liquid saw through, the water-wetness on described upper strata was higher than the water-wetness of described lower floor.
The present invention is by providing a kind of absorbent commodity to realize described purpose, this absorbent commodity comprises liquid permeability surface patch, liquid impermeability bottom sheet and the liquid retainability absorber between these two, wherein surface patch constitutes by having upper strata that is configured in the skin side and the stacked non-woven fabrics that is configured in the lower floor that absorbs the side, wherein, before liquid sees through, the water-wetness of described lower floor than the water-wetness on described upper strata higher or with the water-wetness on described upper strata about equally; After liquid saw through, the water-wetness on described upper strata was higher than the water-wetness of described lower floor.
By the surface patch of absorbent commodity of the present invention, can in the use of absorbent commodity, stably keep the permeability of liquid, and can in use prevent the Surface runoff and the wet back of the body of liquid for a long time.
By absorbent commodity of the present invention, can in use stably keep the liquid permeability of surface patch, and can in use prevent the Surface runoff and the wet back of the body of liquid for a long time.
Description of drawings
Fig. 1 represents the plane graph as the sanitary towel of the surface patch of an embodiment of the surface patch of absorbent commodity of the present invention and the described surface patch of use.
Fig. 2 is the I-I line cutaway view of Fig. 1.
Fig. 3 is the cutaway view of section of schematically representing the thickness direction of surface patch shown in Figure 1.
Fig. 4 (a) and Fig. 4 (b) are the figure for the function that surface patch of the present invention is described, Fig. 4 (a) is the schematic diagram of the saturating liquid status of the commitment of expression after bringing into use, and Fig. 4 (b) represents that to a certain degree liquid sees through the schematic diagram of the saturating liquid status behind the surface patch.
Fig. 5 is the key diagram that is used to illustrate the method for adjustment of the employed test sample of measurement of contact angle after liquid sees through.
Fig. 6 is the cutaway view of an example of concrete cross-section structure of the thickness direction of presentation surface sheet.
Fig. 7 is the schematic sectional view of another example of concrete cross-section structure of the thickness direction of presentation surface sheet.
Fig. 8 (a), Fig. 8 (b), Fig. 8 (a ') and Fig. 8 (b ') be the figure that is used to illustrate the measurement of contact angle method, Fig. 8 (a) and Fig. 8 (b) they are the figure that preferably measures contact angle.In addition, Fig. 8 (a ') and Fig. 8 (b ') are the sketch maps of the fiber behind the droplet evaporation on the expression fiber, are used to measure the tangent line with the fiber surface of the boundary portion of water droplet.
The specific embodiment
Below, based on the preferred embodiment of the invention, the present invention will be described with reference to accompanying drawing.
Shown in the cutaway view shown in 3, surface patch 2 constitutes by having upper strata 21 that is configured in the skin side and the stacked non-woven fabrics 20 that is configured in the lower floor 22 of absorber 4 sides.Upper strata 21 and lower floor 22 all are made of fiber assembly.Fiber assembly described herein also refers to contain fleece before the non-woven fabricsization that obtains by combing method and air-flow (air-laid) method, paper etc. except the non-woven fabrics of being made by various method for makings.Upper strata 21 and lower floor 22 can be the stacked non-woven fabrics 20 of stratification after the nonwovenization, perhaps also can be one deck in office or two-layer all be that stacked back nonwovenization forms stacked non-woven fabrics 20 under the fibroreticulate state before the nonwovenization.
In the drying regime that makes before liquid sees through surface patch 2, the water-wetness of the lower floor 22 of surface patch 2 is higher than the water-wetness on upper strata 21, perhaps with the water-wetness on upper strata 21 about equally.
Thus, commitment after the sanitary towel's (absorbent commodity) that uses surface patch 2 is using beginning, shown in Fig. 4 (a), if liquid A is discharged from (supply) a certain specific part in the surface patch 2, then as arrow A ' shown in, this liquid is hardly from the diffusion of this position, but is drawn in the upper strata 21 that water-wetness keeps than the highland unobstructedly, further 21 shift to lower floor 22 from the upper strata unobstructedly, be absorbed body 4 at last and absorb.When the water-wetness of lower floor 22 is higher than upper strata 21, further 21 shift to the higher lower floor of water-wetness 22 from the upper strata by hydrophilic gradient, so be preferred unobstructedly.
So, the liquid A that is discharged to surface patch 2 does not remain in the surface of surface patch, but shifts to absorber 4 rapidly.Therefore, dry feeling be can obtain, in addition, when absorbing menses etc. and have the liquid of color, its color and inconspicuous hiding effect excellence made on the surface of surface patch 2.In addition, the commitment after using beginning is because the absorbing power (liquid absorption capacity) of absorber 4 is abundant, so even the water-wetness of lower floor 22 is higher, also can not produce the wet back of the body.
As mentioned above, surface patch 2 sees through preceding (before moistening) at liquid, the water-wetness of lower floor 22 than the water-wetness on upper strata 21 higher or with upper strata 21 about equally, after liquid saw through, the water-wetness on upper strata 21 was higher than the water-wetness of lower floor 22.
Just, the hydrophilic durability of the 22 pairs of liquid in the upper strata 21 of surface patch 2 and lower floor is variant, concerning upper strata 21, even contact with liquid, hydrophilic also just reduces more lentamente, with respect to this, for lower floor 22, reduce more for a long time by contact hydrophilic with liquid.Therefore, if make the liquid of abundant amount see through surface patch 2, the height relation of the water-wetness of upper strata 21 and lower floor 22 is turned around.
The situation that the liquid of above-mentioned abundant amount is seen through is meant, for example in diameter is the circle of 10mm the 10g ion exchange water seen through for 5 times, then can be described as the liquid that makes abundant amount and sees through in this circle.This amount of liquid is the transit dose that takes into full account the ion exchange water that the hydrophilic height relation that makes upper strata 21 and lower floor 22 turns around, rather than the liquid transit dose of being supposed when surface patch 2 being used for absorbent commodity such as sanitary towel.Just, actual when using sanitary towel etc., the height relation of the water-wetness of upper strata 21 and lower floor 22 might not be turned around.
Just, shown in Fig. 4 (b), if make the liquid A on a certain ad-hoc location that is discharged to surface patch 2 see through surface patch 2 with the amount of a certain degree, then lower floor 22 is because hydrophilic durability is low, and the water-wetness of the position that liquid sees through (position shown in the dotted line) P reduces widely.With respect to this, upper strata 21 is because hydrophilic durability is higher, even in the position that liquid sees through, hydrophilic reduction is also smaller.
Therefore, can keep the imbedibility of liquid in the upper strata 21 well, the liquid that further is discharged on the surface patch is drawn in the upper strata 21 well.Thus, prevent the Surface runoff of liquid, can prevent that liquid from spilling etc. from the next door and the front and rear part of sanitary towel at surface patch 2.
In addition, because the water-wetness of position (position shown in the dotted line) P that sees through the metric liquid of a certain journey in the lower floor 22 reduces, see through the phenomenon (the wet back of the body) that lower floor 22 bleeds back to the surface so be difficult to produce the liquid B that has moved to absorber 4.
In addition, being drawn into liquid in the upper strata 21 is difficult to suck from the position (P the figure) of the liquid of the amount that sees through a certain degree, as arrow A among Fig. 4 (b) " shown in; be drawn into by the water-wetness gradient and be present in the position that the water-wetness around this position do not reduce, further shift to absorber well.
Therefore, before liquid saw through, the height of the water-wetness of the upper and lower preferably constituted the height of the water-wetness of fiber, was index with the contact angle with respect to the ion exchange water that constitutes fiber, can carry out water-wetness and judge.Just, contact angle is the water droplet on the fiber and the angle of fiber surface, can judge according to the more little water-wetness of its contact angle is high more.In addition, the difference of contact angle then is judged as roughly the same contact angle in ± 3 ° the time, and water-wetness about equally.
In addition, after liquid saw through, the height of the water-wetness of the upper and lower preferably constituted the height of the water-wetness of fiber, was index with the contact angle of the ion exchange water of the formation fiber after seeing through with respect to liquid, can carry out water-wetness and judge.At length being, in diameter is the circle of 10mm, making the 10g ion exchange water see through back (liquid sees through the back) for 5 times, is index with the contact angle with respect to the ion exchange water that constitutes fiber, can carry out water-wetness and judge.Just, the angle that can judge contact angle is more little, and hydrophilic is high more.
From can in use stably keeping the liquid permeability, in use preventing the Surface runoff of liquid and the viewpoint of the wet back of the body long-term and stably, the fiber that constitutes upper strata 21 is preferably 30 °～80 ° at the contact angle that liquid sees through preceding ion exchange water, be preferably 40 °～70 ° especially, and after the ion exchange water that amounts to 50g is seen through in diameter is the circle of 10mm, the contact angle of the ion exchange water after under 30 ℃ dry 2 hours is preferably 35 °～80 °, is preferably 45 °～75 ° especially.
In addition, based on same viewpoint, the fiber that constitutes lower floor 22 is preferably 60 ° or following at the contact angle that liquid sees through preceding ion exchange water, be preferably 40 ° or following especially, and after the ion exchange water that amounts to 50g is seen through in diameter is the circle of 10mm, the contact angle of the ion exchange water after under 30 ℃ dry 2 hours is preferably 40 °～100 °, is preferably 60 °～95 ° especially.The lower limit that the liquid of the fiber of formation lower floor 22 sees through preceding aforementioned contact angle has no particular limits, but liquid permeability from the initial stage, just liquid sets out to the viewpoint that absorber moves unobstructedly, be preferably 20 ° or more than, be preferably especially 25 ° or more than.
As mentioned above, contact angle after above-mentioned liquid sees through is in diameter is the circle of 10mm, after the 10g ion exchange water is seen through for 5 times, estimate, but in diameter is the circle of 10mm, even after the 10g ion exchange water is seen through for 10 times, upper strata 21 and lower floor 22 are also in the scope of above-mentioned contact angle, so be preferred.
(1) for constituting fiber, the assay method of the contact angle of ion exchange water (initial stage contact angle).
With Keyence make microscope VH-8000 with the zoom lens of moderate multiplying factor (having the illumination ring) tilting be that 90 ° state uses, measure being set under 500 times the condition.For test sample, to use under the state of levels one, the size that surface patch is cut into MD150mm * CD70mm is used.Measuring environment is 20 ℃/50%RH, test sample is arranged on measures on the platform, so that test sample is to measure towards last state, and can observe from the CD direction of fleece (non-woven fabrics).
From the CD direction observe fibroreticulate reason be since the usually netted most orientation of fiber on the MD direction, the probability of fiber alignment on the width of measuring picture uprises.By such setting, can observe with lens from vertical direction with respect to the length direction of fiber.
When the contact angle of the formation fiber of trying to achieve the upper strata, as measuring target, when the contact angle of the formation fiber of trying to achieve lower floor, the fiber of following laminar surface (contact absorbs the surface on side) is for measuring target with the fiber of upper surface.Usually,, can on the interface of fibre plate, sheet material be separated,, may mix the fiber of other layer still owing to the situation at interface for the fibre plate of multiple structure.Therefore, former thereby must measure respectively levels the time, based on some at the surface measurements contact angle that does not overlap.
Then, on the test sample that is provided with,, make water droplet be attached to fiber surface, adhering to 5 seconds with interior (being 2～3 seconds as far as possible) acquisition image by filling the aerosol apparatus (use can make vaporific trickle as far as possible instrument) of ion exchange water.The necessary reason that obtains image in short time after adhering to is the water-drop evaporation that the light that sends from microscopical determination part will be adhered to, and the contact angle that oil preparation causes can not occur and change.Measure 10 contact angles of observed result of focus distinctness of the both ends or one end of water droplet and measure, with their meansigma methods as " contact angle ".Contact angle also can followingly be measured: shown in Fig. 8 (a) and Fig. 8 (b), to the photo of image or printing, draw the tangent line of water droplet and fiber, measure by graphical analysis or protractor etc.In addition, contact angle can also following measurement: be not that surface patch is carried out, but measure from the formation fiber that levels is taken out separately.
In addition, this measurement of contact angle should be noted that following item carries out again.
(I) contact angle of mensuration fiber upper surface.With the water droplet that loads on the fiber is object, rather than is that object is measured with the water droplet of the below of falling fiber and with the water droplet across 2 or above fiber.
(II) when fiber produces tiny curling such as helical form, can make and curl lessly, perhaps making tensile fiber is not have curling state estimating.
(III) measurement result of the contact angle arithmetic mean of instantaneous value of 10 measured values of position for a change, if but water-wetness is higher, and on fiber, be difficult to the residual water droplet that has when then measuring, but flowed away.At this moment, judge contact angle according to its mobile ratio.
Till being 10 to measured value, be lower than at total number of measuring and (observe the sum that locates that fiber contacts with water, be the contact back mobile situation of water droplet and the sum of mobile situation not, below identical) 40% when mobile, count " contact angle " with the average result of 10 measured values.
Till being 10 to measured value, always measure number 40% or above when mobile, perhaps under the situation that 10 positions are measured, 40% or above when mobile, " contact angle " is 20 ° or following.
(2) the formation fiber after seeing through for liquid, the assay method of the contact angle of ion exchange water (contact angle after liquid sees through).
Except being prepared as follows test sample, seeing through preceding measurement of contact angle method with aforesaid liquid and similarly measure.
(preparation of test sample)
Surface patch is cut out the size of 150mm * 70mm, it is overlapped 10 be adjusted into paper with the same size of surface patch (by mass area ratio 30g/m
2The paper that forms of paper pulp, wrinkle rate (crepe ratio) is 5～10%) go up and be loaded on the horizontal plane, load the acrylic resin board that has cylinder shown in Figure 5 thereon.Then, on acrylic resin board, place counterweight, surface patch is applied 10g/cm
2Loading.Acrylic resin board is of a size of long 200mm * wide 100mm * thick 8mm, from the height of the cylinder of acrylic resin board upper surface is 50mm, the internal diameter of cylinder is 22mm at the large-diameter portion from the upper end of cylinder to 40mm, reduce internal diameter in the scope from large-diameter portion to below 5mm, further, the minor diameter part (height 5mm) to the cylinder lower end of its below is 10mm.The coaxial aperture that internal diameter is 10mm also is set on aforesaid propylene acid resin plate.Be respectively linearity by the section shape that the plane section that contains Cylindorical rod obtains in the left and right sides of the axle of cylinder for the cylinder inner face between large-diameter portion and the minor diameter part.Load acrylic resin board so that hole disposed thereon is positioned at the central part of surface patch.According to situation, also can inject making marks of part on every side in advance.In addition, when marking in advance etc., use the method that does not influence the liquid diffusion, perhaps on test sample and acrylic resin board end, add the labelling at the center of expression MD/CD, intersection point is measured in the central.
Under this state, ion exchange water is added in the 10ml flask, in 3～5 seconds time, inject in the cylinder reposefully.From the viewpoint of easy observation, the ion exchange water of use dyes with 0.3% redness No. 2 (adding outward).Injection rate is 10g, injects all amounts.Finish injection, ion exchange water placed for 30 seconds after disappearing from surface patch surface, afterwards with 10 paper with new replacement, similarly be provided with once more.When replacing paper, counterweight, acrylic resin board, surface patch are moved, at this moment,, acrylic resin board is not separated with surface patch in order to see through ion exchange water at same position.Then, similarly inject ion exchange water again.In addition, from injecting ion exchange water, even through 180 seconds, ion exchange water is when the surface patch surface disappears (liquid does not see through), as can't measuring, and does not carry out measurement of contact angle.
Repeat this operation, after injecting the ion exchange water that amounts to 50g (5 times), remove counterweight and acrylic resin board, use DSR-114S (ISUZU manufacturing) electric drying device, at dry 2 hours of the surface patch that makes under 30 ℃ after removing paper, the surface patch test sample after seeing through as liquid.In addition, measurement of contact angle is that the formation fiber of the part that sees through ion exchange water (in the circle) to this test sample carries out.
In addition, in diameter is the circle of 10mm, the ion exchange water that amounts to 100g is seen through, 30 ℃ down the contact angle of the ion exchange water after dry 2 hours can followingly measure: except the injection of the ion exchange water of 10g replaces 5 times with repeating 10 times, similarly measure with the measurement of contact angle method of ion exchange water of formation fiber after aforesaid liquid is seen through.
In the early stage, the Klemm absorption of water of surface patch lower floor is higher than the absorption of water on upper strata, the Klemm absorption of water of top section preferably after 3 minutes be 20mm or more than, more preferably after 3 minutes be 30mm or more than.The Klemm absorption of water of lower floor preferably after 3 minutes be 35mm or more than, more preferably after 3 minutes be 40mm or more than.Liquid sees through the height of the absorption of water of preceding the upper and lower and can be judged by the Klemm absorption of water.
(3) mensuration of Klemm absorption of water
For the mensuration of the Klemm absorption of water of top section and underclad portion, be after the upper and lower are as far as possible damaged ground and separated, each several part to be measured separately.In mensuration, use by No. 2 (adding outward) painted ion exchange waters of redness of 0.3%, after the calibration, be the Klemm absorption of water with dried up height after 3 minutes.In addition, the Klemm absorption of water is carried out according to " the absorption of water experimental technique of the K1emm method of paper and paperboard " of JIS P8141 (1996), measures direction and only measures the MD direction.
The height of the water-wetness of the upper and lower after in addition, liquid sees through also can be judged as index by the time with the liquid of ion exchange water.In more detail, use with aforesaid " (2) formation fiber after seeing through for liquid; the assay method of the contact angle of ion exchange water (contact angle after liquid sees through) " identical liquid and see through method (method for implanting of ion exchange water), in diameter is the circle of 10mm, ion exchange water is seen through for 1 time, after this situation that sees through seen through as liquid, after drying, time till seeing through to liquid when further injecting the 10g ion exchange water by the time, is carried out the water-wetness judgement as liquid.By fast more, water-wetness is high more by short more express liquid of time for liquid.
It is shorter than lower floor to see through preferred upper strata of time for liquid.The viewpoint of the liquid permeability of the water-wetness after keep liquid and see through, for injecting at the 2nd time, the liquid on upper strata see through that the time (ion exchange water sees through the back 1 time) is preferably 40 seconds or below, more preferably 30 seconds or below, more preferably 20 seconds or below.In addition, from the viewpoint of the persistence of water-wetness, the 5th on upper strata be preferably 60 seconds when injecting or below, more preferably 40 seconds or below.From preventing the wet back of the body and liquid ambulant viewpoint to absorber, inject for the 2nd time, the liquid of lower floor be preferably 80 seconds by the time (ion exchange water 1 time through after) or more than, more preferably 90 seconds or more than.In addition,, inject for the 5th of lower floor from same viewpoint, the liquid of lower floor be preferably 90 seconds by the time or more than, more preferably 120 seconds or more than.
In addition, from liquid by the upper strata to the mobility of lower floor with prevent the viewpoint of the wet back of the body, inject for the 2nd time, the liquid of the upper and lower be preferably 30 seconds by time difference or more than, more preferably 50 seconds or more than.In addition,, inject for the 5th from same viewpoint, the liquid of the upper and lower be preferably 90 seconds by time difference or more than, more preferably 120 seconds or more than.
Liquid is seen through the time, and assay method is as follows.
(4) liquid is by the mensuration of time
Except sample and part order, liquid similarly carries out by speed experiment and above-mentioned " (2) formation fiber after seeing through for liquid, the assay method of the contact angle of ion exchange water (contact angle after liquid sees through) ".Only difference is as follows.
Working sample: the upper and lower of surface patch are measured respectively.The upper and lower of surface patch are peeled off at interface in the upper and lower of surface patch, measure, and also can make new the upper and lower respectively and measure.
Order of evaluation: similarly inject the 10g ion exchange water with above-mentioned (2), when injecting beginning, measure from the surface of the sample (upper strata of surface patch or lower floor) of minute to the time (liquid passes through the time) of ion exchange water disappearance.After injecting ion exchange water for 1 time and ion exchange water being seen through, make working sample 30 ℃ dry 2 hours down, same position is carried out injecting for the 2nd time and the mensuration of liquid by the time.Similarly, the drying after repeating liquid and seeing through is carried out 5 liquid and is seen through.In addition, measure the working sample that sees through after drying for 1 time and seeing through the position contact angle, mensuration can be same sample, also can be similarly to carry out liquid to see through and exsiccant other working sample.Injection from ion exchange water, even through 180 seconds, when ion exchange water also disappears (liquid sees through) from the surface of working sample, liquid by the time be 180 seconds or more than, do not carry out measurement of contact angle and liquid afterwards mensuration by the time.
The upper strata 21 of surface patch 2 and lower floor 22 can be made of the hydrophobic fibre that uses hydrophilic oil preparation hydrophiling.
As the method that makes the hydrophobic fibre hydrophiling with the hydrophilic oil preparation, can enumerate with hydrophilic oil preparation fiber assembly is formed the method that preceding fiber is handled (dipping (dipping method), spraying, gravure roll coating, printing etc.); The method of oozing out after the hydrophilic oil preparation is sneaked in fiber forms with resin; With hydrophilic oil preparation this fiber assembly that forms behind the fiber assembly is carried out method etc., but find fiber assembly to be formed the infusion process that preceding fiber is handled with hydrophilic oil preparation, from stably demonstrating hydrophilic, the viewpoint of the engineering oil preparation of necessity during to fabric nonwoven cloth (friction when being used to reduce combing method formation fleece) is set out, and infusion process is preferred.
Before liquid sees through, the water-wetness of lower floor is higher than the water-wetness on upper strata, for making after a large amount of ion exchange waters sees through, the height relation of this water-wetness is turned around, the combination of the upper and lower can be by suitably being chosen in the hydrophobic fibre that uses in the upper and lower and being used to make the hydrophilic oil preparation of each fiber hydrophiling to realize.
Can use polyolefin resins such as polyethylene and polypropylene, polyester resins such as polyethylene terephthalate, vinyl resins such as polrvinyl chloride, polyamide-based resins such as nylon etc. as the hydrophobic fibre that uses in the upper strata 21.In addition, in aforementioned various raw materials, also can use the composite fibre (core-sheath-type composite fibre and parallel composite fiber) of 2 kinds of resin formation of combination.Wherein, particularly preferred fiber is polyester resins such as polypropylene (polyolefin resin) and polyethylene terephthalate, and disposes polypropylene or polyester in the core composition, uses poly core-sheath-type composite fibre in the sheath composition.
As the employed hydrophilic oil preparation of the formation fiber on upper strata 21, can be individually or be used in combination with anionic species, cationic, both sexes class and the nonionic class surfactant of various molecular weight, but wherein from based on adhering to stability and reduce to fiber surface because the false knot between surfactant molecule closes the function reduction aspect that (pseudo bonding) causes, preferred a large amount of nonionic class surfactant that cooperates, particularly can obtain the viewpoint of durability from the high material of molecular weight, be preferred.In addition, can use fixative and method such as sneak into as the method that makes the hydrophilic oil preparation be fixed on fiber surface easily, this improve durability aspect, also be preferred.
Be preferably with the content of hydrophobic fibre in upper strata 21 of hydrophilic oil preparation hydrophiling upper strata 21 gross weight 50～100%, be preferably 80～100% especially.In addition, the viewpoint that feels such as fiber surface stably shows hydrophilic from making, the sense that prevents to be clamminess reduce, the adhesion amount of hydrophilic oil preparation is preferably 0.2 to 1.0 weight % of hydrophobic fibre.
Can use and the identical fiber of upper strata 21 employed hydrophobic fibres as the hydrophobic fibre that uses in the lower floor 22, particularly preferred fiber is core-sheath-type composite fibre and parallel composite fiber.
In addition, the hydrophilic oil preparation that uses in the formation fiber as lower floor 22 can be used alone or in combination the surfactant of the anionic species of various molecular weight, cationic, both sexes class, nonionic class, wherein higher from the hydrophilic at initial stage, the viewpoint that obtains suitable durability is set out, preferred a large amount of cationic surfactants that cooperate.
Be preferably with the content of hydrophobic fibre in lower floor 22 of hydrophilic oil preparation hydrophiling lower floor 22 gross weight 50～100%, be preferably 80～100% especially.In addition, for hydrophobic fibre, the adhesion amount of hydrophilic oil preparation, from make fiber surface stably demonstrate hydrophilic, prevent processability low (the hydrophilic oil preparation absorber surface is polluted produce by heat, binding agent cause bonding low inferior) viewpoint, be preferably 0.2 to 1.0 weight %.
Manufacture method as the stacked non-woven fabrics that is made of upper strata 21 and lower floor 22 can be enumerated: after will be by 2 blocks of non-woven fabrics that identical or different manufacture method is made stacked mutually, by heat seal, ultrasonic sealing, bonding agent etc. both parts be bonded on incorporate method on the thickness direction; On the non-woven fabrics of making by various manufacture methods, after making fiber accumulations, use the heating and melting adhesion process, current acupuncture (water neddling) etc. of hot blast method and heat embossing method close-coupled processing thereon, thus make between the fiber of pars fibrosa of accumulation and between the fiber of fiber of piling up and aforementioned non-woven fabrics in conjunction with or interweave and incorporate method; The fleece of manufacturings such as 2 use carding machines is overlapping, it is carried out above-mentioned close-coupled processing method etc.
The non-woven fabrics that uses in forming as upper strata 21 and/or lower floor 22 can enumerate the non-woven fabrics that forms by the heat fusing Method for bonding, by current interweave non-woven fabrics that method forms, the non-woven fabrics that forms by needle point method, the non-woven fabrics that forms by solvent bonding, the non-woven fabrics that forms by spun-bond process, the non-woven fabrics that forms by meltblown etc.
In addition, for the adjusting of carrying out water-wetness etc., hydrophilicity-imparting treatment can not carried out in the upper and lower, and contain material this as hydrophilic fibres such as hydrophilic artificial silk, Cotton Gossypiis.But, the content when containing this hydrophilic fibre preferably in the upper strata be 30% or below, in lower floor be 70% or below.
In the present invention, from further raising liquid from the upper strata the ambulant viewpoint to lower floor, the apparent density of preferred lower floor 22 is higher than the apparent density on upper strata 21.
Can use than upper strata 21 higher methods as the apparent density that makes lower floor 22: make the fineness ratio of the fiber that constitutes lower floor 22 constitute the bigger method of fineness of the fiber on upper strata 21, and/or make the interfibrous distance that constitutes lower floor 22 than the littler method of interfibrous distance that constitutes upper strata 21.
The apparent density on the apparent density of lower floor 22 and upper strata 21 can followingly be measured.
After peeling off the upper and lower, load and be adjusted to loading 0.5g/cm
2Substrate (perhaps loading the substrate of counterweight), observe thickness (observation of thickness can be carried out at the either side of its MD/CD end, and in the MD/CD end, regulating substrate is aforementioned loading).Observation is to use at following state: in Keyence system microscope VH-8000, with low range tilting to the zoom lens (the band illumination encircles) of moderate multiplying factor be 90 °.Bring the one-tenth-value thickness 1/10 of gained into following formula, thus the apparent density of calculating.
Apparent density (g/cm
3)=[non-woven fabrics mass area ratio (g/cm
2)/thickness (mm)] * 10
3
The apparent density of lower floor 22, the viewpoint from the liquid imbedibility that improves the initial stage is preferably 0.05～0.5g/cm
3The apparent density on upper strata 21 from contacting the viewpoint that skin and liquid move to lower floor easily, is preferably 0.01～0.3g/cm
3
Material as the each several part that constitutes sanitary towel 1 can use material commonly used in this technical field with being not particularly limited.For example, as the bottom sheet 3 preferred liquid impermeability thin film that use.Use the mixing of Time of Fluff Slurry (fluff pulp) and superabsorbent polymer particle to tire out folded thing as absorber 4, perhaps will mix folded fine thing encases formation with cotton paper liquid permeability sheet materials such as (tissue paper) material.Form with sheet material 5 as sidepiece, can use water proofing property non-woven fabrics and liquid impermeability resin film etc.
More than, the preferred embodiment of the invention is described, but in the scope that does not break away from aim of the present invention, can suitably change.
For example, upper strata 21 and lower floor 22 can be respectively plane, and as Fig. 6 or shown in Figure 7, from preventing viewpoints such as remained on surface liquid, raising dry feeling, preferably 21 sides have concavo-convex on the upper strata at least.In the example shown in 6, portion of hot is melt bonded by the heat embossing processing for upper strata 21 and lower floor 22, and the part beyond the heat fusing bonding part 23 on upper strata 21 forms protuberance 24 to the skin side protuberance of user, and melt bonded 23 of aforementioned hot forms recess.In example shown in Figure 7, connect upper strata 21 and lower floor 22, form open circumferential portion 25 in the side-prominent three-dimensional perforate 26 of coming out of lower floor 22.The surface patch of Fig. 7 is following integrated: hold between the mould roller break-through when forming three-dimensional perforate 26 what side face had only the die roll of a plurality of peckers and had that insert pecker a plurality of bear the hole, by heating and pressurization, make upper strata 21 and lower floor 22 integrated.
In addition, the sanitary towel of above-mentioned embodiment (absorbent commodity) can be only covered by above-mentioned surface patch 2 at the middle section of the width of sanitary towel, but the Zone Full on surface that also can be the contact skin side of absorber is covered by above-mentioned surface patch 2, in addition, also can only be covered by above-mentioned surface patch 2 at the length direction of sanitary towel and the central part of width.
In addition, absorbent commodity of the present invention can also be incontinence pad, sanitary pad, disposable diaper etc. except sanitary towel.
Below, use embodiment that the present invention is described further.But scope of the present invention is not limited to these embodiment.
[embodiment]
The surface patch that uses among the embodiment is by following fiber and method for making, non-woven fabricsization and forming.
(use fiber)
Fiber is after being immersed in the aqueous solution that has dissolved hydrophilic oil preparation composition, passes through drying process, and adheres to the hydrophilic oil preparation composition (described infusion process) of scheduled volume at fiber surface.Here, the various engineering compositions (the purpose composition of the friction when for example being used to reduce the combing operation) of necessity in the time of in the hydrophilic oil preparation, can also containing the non-woven fabrics manufacturing.In addition, calculate from the amount of the aqueous solution of preserving each fiber should be attached to the amount of the hydrophilic oil preparation composition of fiber surface for the amount (concentration) that is dissolved in the hydrophilic oil preparation composition in the aqueous solution.
Fiber A: on NBF (SH) 2.2dtex * 51mm (core composition PET/ sheath composition PE, volumetric ratio 1:1) of big and weaving (strain) manufacturing, adhering to respect to fiber A is 0.45 weight % hydrophilic fibre oil preparation a.
Fiber B: on NBF (SH) 3.3dtex * 51mm (core composition PET/ sheath composition PE, volumetric ratio 1:1) of big and weaving (strain) manufacturing, adhering to respect to fiber B is 0.45 weight % hydrophilic fibre oil preparation a.
Fiber C: on NBF (SH) 2.2dtex * 51mm (core composition PET/ sheath composition PE, volumetric ratio 1:1) of big and weaving (strain) manufacturing, adhering to respect to fiber C is 0.3 weight % hydrophilic fibre oil preparation b.
Fiber D: on NBF (SH) 2.2dtex * 51mm (core composition PET/ sheath composition PE, volumetric ratio 1:1) of big and weaving (strain) manufacturing, adhering to respect to fiber D is 0.35 weight % hydrophilic fibre oil preparation c.
Fiber E: on NBF (SH) 2.2dtex * 51mm (core composition PET/ sheath composition PE, volumetric ratio 1:1) of big and weaving (strain) manufacturing, adhering to respect to fiber E is 0.3 weight % hydrophilic fibre oil preparation d.
Fiber F: on NBF (SH) 2.2dtex * 51mm (core composition PET/ sheath composition PE, volumetric ratio 1:1) of big and weaving (strain) manufacturing, adhering to respect to fiber F is 0.35 weight % hydrophilic fibre oil preparation e.
Fiber G: on NBF (SH) 2.2dtex * 51mm (core composition PET/ sheath composition PE, volumetric ratio 1:1) of big and weaving (strain) manufacturing, adhering to respect to fiber G is 0.42 weight % hydrophilic fibre oil preparation f.
The hydrophilic fibre oil preparation that uses in the above-mentioned fiber is respectively following composition, all is moisture beyond the effective ingredient.
Hydrophilic oil preparation a (effective ingredient rate 25%): the sweet Lay alkali of POE fatty acid amide 20%/alkylphosphonate K salt 20%/alkyl 30%/sulfosuccinic acid alkyl ester Na salt 30%
Hydrophilic fibre oil preparation b (effective ingredient rate 40%): alkylphosphonate K salt 70%/alkyl diol 30%
Hydrophilic fibre oil preparation c (effective ingredient rate 55%): alkylol phosphate ester K salt 60%/alkylphosphonate K salt 40%
Hydrophilic fibre oil preparation d (effective ingredient rate 50%): polyoxyethylene alkyl ether sulfuric ester Na salt 50%/fatty acid Na salt 50%
Hydrophilic fibre oil preparation e (effective ingredient rate 35%): alkylphosphonate K salt 60%/alkyl diol 30%/modified silicone 10%
Hydrophilic fibre oil preparation f (effective ingredient rate 30%): the sweet Lay alkali of POE fatty acid amide 20%/alkyl acid phosphate K salt 20%/alkyl 30%/sulfosuccinic acid alkyl ester Na salt 30%
(manufacturing of non-woven fabrics)
Embodiment 1: divide comb manufacturer area quality 12g/m by carding machine with fiber A
2Fleece, divide comb manufacturer area quality 13g/m by carding machine with fiber D again
2Fleece, after two fleeces are overlapped, become mass area ratio 25g/m by 136 ℃ hot blasts (hot blast method)
2Non-woven fabrics.
Embodiment 2: divide comb manufacturer area quality 12g/m by carding machine with fiber B
2Fleece, divide comb manufacturer area quality 13g/m by carding machine with fiber C again
2Fleece, after two fleeces are overlapped, become mass area ratio 25g/m by 136 ℃ hot blasts (hot blast method)
2Non-woven fabrics.
Embodiment 3: divide comb manufacturer area quality 25g/m by carding machine with fiber A
2Fleece, make non-woven fabrics by 136 ℃ hot blasts (hot blast method), divide comb manufacturer area quality 25g/m by carding machine with fiber C
2Fleece after, overlap with the non-woven fabrics of fiber A, by the integrated mass area ratio 50g/m that becomes of 130 ℃ pin knurling rolls (pin emboss roll) (embossing)
2Non-woven fabrics.
Embodiment 4: divide comb manufacturer area quality 25g/m by carding machine with fiber A
2Fleece, make non-woven fabrics by 136 ℃ hot blasts (hot blast method), in addition, divide comb manufacturer area quality 25g/m with fiber C by carding machine
2Fleece, make non-woven fabrics by 136 ℃ hot blasts (hot blast method), after these 2 non-woven fabrics coincidences, the non-woven fabrics that makes coincidence is at the porcupine roller that is heated to 130 ℃, insert thin plate between pin and the pin, and be heated between 130 ℃ the backing roll and pass through, when forming perforate, at the integrated mass area ratio 50g/m that becomes of open end
2Non-woven fabrics (spy opens the method for flat 10-80445 communique record).
Embodiment 5: divide comb manufacturer area quality 25g/m by carding machine with fiber G
2Fleece, make non-woven fabrics by 136 ℃ hot blasts (hot blast method), divide comb to become mass area ratio 25g/m fiber E by carding machine again
2Fleece after, overlap with the non-woven fabrics of fiber G, by the integrated mass area ratio 50g/m that become of 130 ℃ of aciculiforms projection roller (embossing)
2Non-woven fabrics.
Comparative example 1: except using fiber D replacement fiber A, make non-woven fabrics according to method similarly to Example 1.
Comparative example 2: except using fiber E replacement fiber A, use fiber F replacement fiber C, make non-woven fabrics according to method similarly to Example 3.
Comparative example 3: except using fiber F replacement fiber A, use fiber E replacement fiber C, make non-woven fabrics according to method similarly to Example 3.
Comparative example 4: except using fiber D replacement fiber A, use fiber A replacement fiber D, make non-woven fabrics according to method similarly to Example 1.
Make the mutually the same embodiment of polylith structure and each non-woven fabrics of comparative example, in the mensuration of following (a)～(d), each mensuration is all used different non-woven fabrics (structure is identical).
(a) initial stage measurement of contact angle
To each non-woven fabrics of gained, the face side by measuring each non-woven fabrics respectively and the contact angle of bottom surface side are measured the contact angle of the formation fiber of the upper and lower.Assay method such as above-mentioned (1) initial stage measurement of contact angle method.Measurement result is shown in contact angle " initial stage " hurdle of table 1.
(b) measurement of contact angle after liquid sees through
See through back measurement of contact angle method according to above-mentioned (2) liquid, the diameter in each non-woven fabrics is in the circle of 10mm, the 50g ion exchange water is seen through after, drying.To the permeation parts (in the aforementioned circle) of the ion exchange water in each non-woven fabrics, measure the contact angle of the formation fiber of the upper and lower.Its measurement result is shown in " 50g liquid is by the back " hurdle of the contact angle of table 1.Then,, in the new non-woven fabrics of adjusting, the 100g ion exchange water is seen through for the part non-woven fabrics that can measure (liquid sees through time 180s or following), and dry.Similarly measure contact angle, its measurement result is shown in contact angle " 100g liquid is by the back " hurdle of table 1.In addition, in the evaluation of the contact angle after liquid sees through, when liquid is seen through 1 time mensuration (liquid of ion exchange water 10g passes through the time) and surpasses 180 seconds,, finish to measure as not measuring.
(c) liquid is by time and replication contact angle
The liquid of table 2 record by speed experiment and replication contact angle as described above (4) liquid pass through shown in the mensuration of time.The lower floor of the upper strata of working sample use embodiment 3, the upper strata of embodiment 2, embodiment 2, comparative example 1, the upper strata of comparative example 2, the lower floor of comparative example 2.
When being used for only measuring the upper strata of incorporate non-woven fabrics or lower floor, the release surface of described the upper and lower must be with different faces as the mensuration face.In addition, the contact angle when liquid surpasses 180 seconds by the time is not measured, as not measuring.
(d) the liquid surface diffusion is estimated
On the substrate of 45 ° of inclinations, each non-woven fabrics is fixed towards substrate-side by lower floor, on this non-woven fabrics, in 30 seconds, drip with the painted ion exchange water of No. 2,0.3% redness (outside add) with the speed of 1g/10 second from the silicon pipe of internal diameter φ 5mm, measure the distance of the liquid that flows through the upper strata.This evaluation is not carried out state that flows through (to 1/2nd or the following state that occurs on the top layer of drop) between the upper and lower and the situation that flows through the top layer.
Claims (6)
1. the surface patch of an absorbent commodity, it constitutes by having upper strata that is configured in the skin side and the stacked non-woven fabrics that is configured in the lower floor that absorbs the side, wherein, before liquid saw through, the water-wetness of described lower floor was higher or equate with the water-wetness on described upper strata than the water-wetness on described upper strata; After liquid saw through, the water-wetness on described upper strata was higher than the water-wetness of described lower floor.
2. the surface patch of the absorbent commodity of putting down in writing according to claim 1, wherein, for the fiber that constitutes described upper strata, the contact angle that liquid sees through preceding ion exchange water is 30 °～80 °, and in diameter is the circle of 10mm, make the 10g ion exchange water see through for 5 times, 30 ℃ down the contact angle of the ion exchange water in this circle after dry 2 hours be 35 °～80 °.
3. the surface patch of the absorbent commodity of putting down in writing according to claim 2, wherein, for the fiber that constitutes described lower floor, the contact angle that described liquid sees through preceding ion exchange water is 60 ° or following, and in diameter is the circle of 10mm, make the 10g ion exchange water see through for 5 times, 30 ℃ down the contact angle of the ion exchange water in this circle after dry 2 hours be 40 °～100 °.
4. the surface patch of the absorbent commodity of putting down in writing according to claim 1, wherein, the apparent density of described lower floor is higher than the apparent density on described upper strata.
5. absorbent commodity, it comprises surface patch, the bottom sheet of liquid impermeability and the absorber of the liquid retainability between these two that claim 1 is put down in writing.
6. the absorbent commodity of putting down in writing according to claim 5, wherein, this absorbent commodity has the shape that is essentially vertical length, described surface patch is that the horizontal middle section at described absorbent commodity is covered with described absorber, in the both sides of this middle section, the sidepiece of water proofing property or liquid impermeability forms and is covered with described absorber with sheet material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP120834/2004 | 2004-04-15 | ||
| JP2004120834 | 2004-04-15 |
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| Publication Number | Publication Date |
|---|---|
| CN1682675A CN1682675A (en) | 2005-10-19 |
| CN100512784C true CN100512784C (en) | 2009-07-15 |
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ID=35262301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100652519A Active CN100512784C (en) | 2004-04-15 | 2005-04-15 | Surface sheet of absorptive article |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101148537B1 (en) |
| CN (1) | CN100512784C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10195092B2 (en) | 2014-03-06 | 2019-02-05 | The Procter & Gamble Company | Multi-component topsheets |
| US10206826B2 (en) | 2014-03-06 | 2019-02-19 | The Procter & Gamble Company | Three-dimensional substrates |
| US10285874B2 (en) | 2014-03-06 | 2019-05-14 | The Procter & Gamble Company | Multi-component topsheets |
| US10973702B2 (en) | 2015-08-26 | 2021-04-13 | The Procter & Gamble Company | Absorbent articles having three dimensional substrates and indicia |
| US11202723B2 (en) | 2016-07-01 | 2021-12-21 | The Procter & Gamble Company | Absorbent articles with improved topsheet dryness |
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| CN102673030A (en) * | 2012-05-17 | 2012-09-19 | 厦门延江工贸有限公司 | Perforated non-woven fabric |
| JP6411066B2 (en) * | 2014-05-12 | 2018-10-24 | ユニ・チャーム株式会社 | Absorbent article including nonwoven sheet for absorbent body, and method for producing nonwoven sheet used for absorbent article |
| JP5683742B1 (en) * | 2014-06-30 | 2015-03-11 | ユニ・チャーム株式会社 | Absorbent article and wearing article comprising the absorbent article |
| KR102081047B1 (en) * | 2015-08-24 | 2020-02-25 | 카오카부시키가이샤 | Nonwoven fabric and absorbent article provided with same |
| WO2019075689A1 (en) | 2017-10-19 | 2019-04-25 | The Procter & Gamble Company | Topsheet comprising natural fibers with good mechanical strength |
| WO2019075688A1 (en) | 2017-10-19 | 2019-04-25 | The Procter & Gamble Company | Topsheet comprising natural fibers |
| CN109718012A (en) * | 2017-10-27 | 2019-05-07 | 捷恩智株式会社 | Absorbent commodity |
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| JPH0687874B2 (en) * | 1986-05-07 | 1994-11-09 | 花王株式会社 | Absorbent article |
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| CN1129552A (en) * | 1993-12-28 | 1996-08-28 | 花王株式会社 | Absorbent article |
| EP0953324A1 (en) * | 1998-04-28 | 1999-11-03 | The Procter & Gamble Company | Apertured laminate web |
| CN1349787A (en) * | 2000-09-01 | 2002-05-22 | 尤妮佳股份有限公司 | Absorbent articels using surface material of continuous filament yarn |
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| US10195092B2 (en) | 2014-03-06 | 2019-02-05 | The Procter & Gamble Company | Multi-component topsheets |
| US10206826B2 (en) | 2014-03-06 | 2019-02-19 | The Procter & Gamble Company | Three-dimensional substrates |
| US10285874B2 (en) | 2014-03-06 | 2019-05-14 | The Procter & Gamble Company | Multi-component topsheets |
| US11033440B2 (en) | 2014-03-06 | 2021-06-15 | The Procter & Gamble Company | Three-dimensional substrates |
| US10973702B2 (en) | 2015-08-26 | 2021-04-13 | The Procter & Gamble Company | Absorbent articles having three dimensional substrates and indicia |
| US11202723B2 (en) | 2016-07-01 | 2021-12-21 | The Procter & Gamble Company | Absorbent articles with improved topsheet dryness |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20060045775A (en) | 2006-05-17 |
| CN1682675A (en) | 2005-10-19 |
| KR101148537B1 (en) | 2012-05-23 |
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