CN1007207B - Face material with clean and dry appearance facing - Google Patents

Abstract

The present invention relates to surface layer material of a product absorbing body liquid. The material is basically not wetted and can penetrate to the body fluid; moreover, a clean and dried appearance of the surface layer material can be kept after the product absorbs the body fluid. The surface layer material containing polyolefin has an opening area which accounts for 1.3 to 35 % of the total area to ensure that the body fluid passes through, and sufficient opacifiers are incorporated into the surface layer material to ensure that a flake displays the brightness of least 45 %.

Description

Face material with clean and dry appearance facing

The invention relates to the surface lining of the product that absorbs human secretion, particularly about the surface lining of sanitary towel, after sanitary towel had absorbed liquid, surface lining still kept cleaning and exsiccant appearance relatively.

Be used to absorb the product, particularly sanitary towel that absorbs function that have of human secretion, generally include one fit: this face is attached on the health, and human secretion can go out through this surface current; An absorbent cores; Be used for absorbing or preserving excretory liquid; And subsides clothing face: generally be that the inner face two lower limb bifurcateds that attach underwear are partly worn usefulness.The fit face of general sanitary towel has a lining that can see through liquid, and the subsides clothing face of sanitary towel has a block liquid resistant barrier material.Some situation is, fit flooring is stretched over whole this product, and be attached to barrier material above.

Recently; See through the lining of face as body fluid, not only selecting for use can be through body fluid, and can not be by the body fluid moistening, promptly hydrophobic material.During use, this hydrophobic lining is keeping relatively dry, thereby making user feel more comfort aspect, truly has some advantages.In addition, because can not get wet, so just can not leave contamination on the side surface within it.Therefore, owing to use hydrophobic lining in the product of suggestion manufacturing absorb body fluids, and make this technology now more substantial.For example, United States Patent (USP) No. 3695269, No. 4041951 and 4391869 has proposed all to comprise that the non-woven fabric of hydrophobic fibre is as the lining that absorbs product.It is that full wafer is a hydrophobicity polymer material that United States Patent (USP) then proposes used surface material for No. 2992644, No. 3814101 and No. 4324246, also can be shaped on hole so that see through body fluid.

In general, this class hydrophobic facing material can allow body fluid to see through, and can not be infected with or get wet again.But find that also user still has the uncomfortable sensation of feeling that surface layer pollutes.This abnormal conditions, though may be not dirty character cannot not to be arranged wetly because make the material of surface layer, manifest but the absorbing material below the surface layer must be finished its absorption function and to be infected with, and user can be seen pollution on the absorbing material of surperficial lower floor by surface layer.This situation is when using as the sanitary towel that dark color stain thing is arranged, and is just particularly remarkable, and be easy to see contamination surface layer below by used so far lining this moment.

Therefore, be necessary to provide a kind of new surface material, it should finish desired, can not moistening or pollute under the condition of surface layer, allow body fluid to transfer to function on the absorbent cores of this product, can make it have the outward appearance that seems clean and dry again, thereby user is felt comfortably cool psychologically.

According to technology of the present invention, a kind of surface material that is used as the product of absorb body fluids is provided, this surface material not only in fact can moistening and can be seen through body fluid, and after product has absorbed body fluid, can improve the cleaning and the degree of drying of the product appearance that is manifested greatly yet.

Surface layer particularly of the present invention is the polyolefin unitary piece of material of making from comprising in polyethylene, polypropylene and this group of their copolymer.Enough opacifiers are incorporated in this high polymer material, surface material are represented be at least 45% brightness (as hereinafter defined).Particularly this can realize by the titanium dioxide or other opacifier that identical function is arranged that mix about 5-20% in tablet.At least to have hole in the zone of desiring body fluid is passed through on the tablet so that body fluid be able to by.The aperture area of hole accounts for desires to make 1.3% to 35% of the gross area that body fluid passes through.

Also find, the polyolefine sheet material of filling through the heavy titanium dioxide of this special selection, add and to make the apparent restriction that aforementioned minimum brightness is arranged of titanium dioxide itself in the surface layer sheeting aforementioned aperture area, make the surface layer of so selecting not only truly have and make and absorb the function that product is possessed clean and dry appearance, and user will be had to do be clean and dry, accepted, thereby can not brought any spiritual uncalm sense to user.So far, once the someone proposed to use perforated polyolefine sheet material to make surface layer, for example in No. 4135021 patents of the U.S., mentioned this class thin slice and had used titanium dioxide very in a small amount, so that the polyolefin delustring, and make sheeting adularescent outward appearance.But have been found that when it is used in combination with the product of absorb body fluids, a spot of titanium dioxide like this, reality is not enough to cover the outside of pollution.

Also the someone proposes to use the polyolefine sheet that has eyelet, and the perforated openings area of this thin film accounts for the percent of the gross area, can be different in a very wide scope.But also find, when using the lower bound of above-mentioned open region scope, even if can be enough to make thin film that function through secretions is arranged, if but have the part of enough transparencys in the closed area of manufactured goods at least, when exposing the pollution assimilate that is positioned at below it, this product still can show the pollution mark.On the other hand, when using largely the open area, just can see through eyelet itself and obviously see contamination, user still can be seen contamination as a result.

Opposite with aforementioned these technology, find as select to have the surface material of high-load titanium dioxide, and use narrower aperture area, the visibility of following pollution is obviously reduced.And this visibility that has reduced is with the brightness of surface material relevant.To employed in the literary composition " brightness " this term, by test method cited below from measuring definition, but can be regarded as use with a kind of technology, under same lighting condition, measure from conceptive, by the amount of the light that sample reflected, and recently represent it with this percentage of measuring the light quantity of shared standard sample reflection.This percentage ratio is high more, and the ability of covering up of surface material is just big more.Found when skin-material has at least about 45% brightness, promptly to produce the effect of covering up significantly.

Brief description to diagrammatic sketch

Fig. 1 is the perspective view of first kind of sanitary towel that has the present invention's surface layer.Show wherein being removed of several sections among the figure.

Fig. 2 is the cross-sectional view strength of the sanitary towel of Fig. 1 of cutting open of 2-2 along the line.

Fig. 3 is the longitudinal plane view of Fig. 1 sanitary towel of cutting open of 3-3 along the line.

Fig. 4 is the amplification view of thin portion that shows the present invention's surface material.

Fig. 5 is the perspective view of second kind of sanitary towel that has the present invention's surface layer.Also showing several parts is removed.

Fig. 6 is the cross-sectional view strength of Fig. 5 sanitary towel of cutting open of 6-6 along the line.

Fig. 7 is the relation between graphic representation brightness, open area and the titanium dioxide incorporation.

Detailed description of the present invention

Now, be illustrated as the perspective drawing of the sanitary towel 10 of first surface layer that has the present invention referring to Fig. 1.Fig. 2 and Fig. 3 illustrate the transverse section and the vertical section of sanitary towel 10 respectively.

Sanitary towel 10 comprises the plane pad of a common absorbing material, and it can be any this class material that is applicable to sanitary towel, for example can comprise loosely in conjunction with absorbing material, as cellulose fibre, resembles wood (paper) slurry, regenerated cellulose or cotton fiber etc.These fibers may be through chemistry or the modification of thing method, and this pad also can comprise the material that these fibers combine with other material, can be natural in synthetic, as if hydrophobic foam, hydrophobicity polymer etc.

As Figure 1-3, pad 12 is to be wrapped in the covering 14 that a kind of soft fabric makes, and covering can help in manufacture process this product to be held together together, and makes the product of finishing at last possess certain shape.

The first first type surface 17(that is attached to pad leaves the face of user health) and fill up above at least a portion edge of 12 19, be the impervious layer 18 of body fluid.Layer 18 can stop body fluid to pass through, and is infected with underwear to prevent it, can make with any material that is suitable for this requirement.For example, layer 18 can be the high polymer thin slice, and as polyethylene, polypropylene or cellophane also can be the materials that normal condition can not see through liquid after treatment through liquid, as repellant or tissue.Advantageously, layer 18 be a kind of hot adhesion material, as polyethylene, can be bonded on the surface layer of the present invention and on the layer 16, fills up 12 to seal fully.

In a preferable structure,, constitute the skin that pastes the clothing face by a kind of non-woven tissue layer 20.Using this fabric outer, is to consider from aesthetic angle and the angle with soft feeling.

Can know from Fig. 2 and 3 and to see that the subsides clothing face of towel 10 has pressure-sensitive adhesion composition 22.On the two lower limb bifurcations that towel are bonded at the user underwear.Show as institute among the figure is concrete.These adhesion compositions 22 are the band that three kinds of forms are longitudinal extension.Adhesioin zone or band are with the released strip protection, to prevent to use the preceding adhesion of not expecting.

According to technology of the present invention, upper strata second first type surface 15 of sanitary towel, promptly sanitary towel is attached to the face of user health, is precoat 16 of the present invention.

Layer 16 is the monoblock thin slices that are made of polyolefin, has eyelet, and body fluid is passed through through it, promptly fills up 12 to arrive absorbent cores, and is absorbed.Because of having used the technology for preparing eye thin slice with holes more to become perfect, conventional method is at first to make unperforated monoblock polyolefine sheet to this technology, makes eyelet with the acupuncture perforation afterwards at present.Promptly be decorated the relief shape or make sludge ice acanthopore afterwards; Heating makes some regional attenuation, makes a deformation of thin membrane of attenuation selectively with stretching or method for distinguishing, and the regional perforation of selecting.

A useful especially method is to reach described in No. 3139746 patents of the U.S..This kind method generally is described to the manufacture method of web-shaped product.Its method comprises the high polymer thin slice of the molding that stretches, i.e. the thin slice of relief or depression.

Fig. 4 provides a this part that can be used as the shape sheet material of layer 16, is the plan view that amplifies.This Web materials comprises the volume strand 21 of crest line shape and limits the land 22 of eyelet 23.

The high polyolefin that is used for surface material of the present invention can be selected from one group of material that comprises polyethylene, polypropylene or its copolymer, and selected polyolefin is high density polyethylene (HDPE) simultaneously.Other high polymer also can be used to increase desired characteristic.For example, a kind of useful especially mixture, include than small part contain the acyl group high polymer, as highly impact-resistant polystyrene.Addressed this mixture in No. 4135021 patents of the U.S., as talking about in this, this acyl group high polymer that contains is calculated by weight and can be accounted for 40% the ratio that is no more than, and particularly is no more than 20%, promptly accounts for the 5-20% of gross weight.

Address in No. 4135021 patents of the above-mentioned U.S., this material can contain a kind of inertia delustring implant that is lower than weight 5%, as titanium dioxide.Allegedly can improve the outward appearance and the rippability of material.In contrast, have now found that only a kind of like this surface material is not enough to shelter the lip-deep pollution in absorption region that body fluid absorbs product fully, therefore can not reach purpose of the present invention.For it, found in order to make the surface material energy purpose according to the invention of this product, the aforementioned qualification to the open area that proposes with this paper combines consideration, and material just must the relatively large titanium dioxide (or other material with suitable with it opaque character) of filling.Loading is calculated by weight and must preferably be no more than 12% of weight certainly greater than 5%.In fact, if the upper limit of selected loading surpasses 12%, then titanium dioxide may separate from the high polymer mixture in manufacture process, thereby higher loading is unfavorable.This filling preferably should be about 7% to about 10%.

As mentioned in this article, in order to reach desired masking effect, high titanium dioxide is filled and must be combined with aforesaid restriction aperture area scope.Here said aperture area is the gross area of surface layer perforations, as measured on the body side surface that absorbs product, recently represents with the percentage of the surface layer gross area.Very clear, if there is not open region fully,, can increase the ability that it shelters position contamination below to greatest extent for the surface layer of given content of titanium dioxide.Certainly, do not have open region just can not make body fluid yet, therefore must provide some aperture areas by to enter the uptake zone of product.Talk about in No. 4324246 patents of the U.S., aperture area should be 35% at least, preferably is not less than 55%.But have now found that if with like this big aperture area, then the masking effect of surface layer can lower greatly, if do not consider the titanium dioxide loading, then the pollution below this surface layer will see too clearly.Finding further that again so big opening is transferred to absorbent cores for body fluid by surface layer, then is fully unnecessary.For the sanitary towel of maximum specification, as long as account for about opening of 5% to 35% of whole sanitary towel size, just can satisfy the needs that body fluid shifts fully; And for the product that is designed to adapt to low body fluid flow velocity, as minimum liner, panty liner etc., aperture area is little promptly applicable to 1.3%.Should be clear and definite be, the surface material of little aperture area like this, absorb the desired transfer velocity of product though itself can be adapted to body fluid, but also still can not reach the inventor's purpose of design, promptly shelter the purpose of the contamination of lower floor, it is aforesaid to opacity also not satisfy this paper, the restriction of promptly high titanium dioxide loading.

Again referring to Fig. 1-3, graphic extension when adding a certain amount of body fluid, the situation that manifests of the contamination of towel 10.As shown in these figure, be positioned at following liner 12 and tissue encapsulation thing 14 manifests, show the contamination 26 that dark color is arranged.By Fig. 2 and 3 as seen, because layer 16 has the hydrophobic of aforementioned surface material and moisture impermeability matter, in fact, body fluid can not be present on the layer 16 or in the layer 16 with any real mass.However, the surface material of front still can make contamination in sight by surface layer.In contrast,, the visibility that lower floor stains can be reduced greatly, shown in the diagram among Fig. 1, in zone 28, a fuzzy pollution sign can only be seen by relevant technologies of the present invention.

Referring again to Fig. 5 and Fig. 6, two figure represent to use the thin portion structure of the another kind of sanitary towel 30 of surface material of the present invention.Sanitary towel 30 has an absorbent cores, and promptly liner 30.The upper strata of the subsides clothing face of towel is a barrier layer 34, as shown in the figure, this barrier layer also held longitudinal edge above, and some is attached on fit.In the mode similar in appearance to towel 10 shown in Fig. 1-3, towel 30 has adhesive unit (2) 36, and so that towel is adhered on the underwear, before the use, said adhesion unit is that a released strip 38 is being protected.

A slice surface material 40 is provided, is attached on the fit position of towel, and overlap mutually at relative subsides clothing face, thereby entirely wrapped pad 32 and barrier layer 34.This lamella is to be dependent on the used technology of the present invention to make.And be at least in order to cover the fit face portion of sanitary towel.About structural material, perforated area and titanium dioxide loading, consistent with the aforementioned feature of this paper.As clearly showing among Fig. 5, the stain 42 on the liner 32 obviously as seen, but by surface layer 40, the pollution of appearance then is difficult for finding out in zone 44.

By following embodiment, will recognize the place of advantage of the present invention better.

Example 1

To the sheeting of the eye a series of with holes of opacity and different size openings areas is in various degree arranged, do the brightness test.

The brightness test is to use 85364 type Ka Ercaisi (Carl Zeiss) photoelectric reflection specific luminosity meter, its structure is formed and the operation formula, address in " the photoelectric reflection specific luminosity meter ELREPEO operation instructions " published by Cai Si company with this instrument, this paper will list list of references altogether in.With this Instrument measuring brightness, be to use 457 millimicrons of the sample (ratios of the co-wavelength light that the light of Lan-Bai) is reflected the white reference surface of a desirable liner basically.This instrument be with between two white lamp lamps according to bright sample and reference surface, the video of sample and standard reference material projects on the photocell, the difference between current of these photocells of flowing through is just indicated on null detector.The luminous flux that is changing in the reference beam is adjusted unit by a mechanical diaphragm, and can directly read the orienting reflex of sample.At first through rotating filtering sheet transducer, being transferred to position 12(is a blank that does not see through photocell, and light beam is passed through), come calibration instrument.Use the adjusting knob at zero point,, finish the instrument zeroising with the indicator pointer set to zero.Afterwards optical filter is fixed on this position of position 8(and be to use the R457 optical filter).The dressing table of instrument is removed, change opal glass standard film (No. 21858), the scale drum is rotated 82.85%, zero point is calibrated in fine tuning again.If set to zero just uses the neutral wedge controller to come zeroising, when swing arm fixed on certain position, the scale drum promptly was fixed on several 93.7%.Remove the glass standard, change dressing table, swing arm terminates on the position of departing from, and tested cladding material is placed on the black dressing table, to cover dressing table fully.When rotation scale drum, use fine setting, make pointer point to zero point.In case pointed zero point, just can directly read percentage brightness by the scale drum.

A series of weight are the wood pulp liner of 6 grams, and its whole area is for long 10.2 centimetres long-pending wide 7.6 centimetres, and thickness is 1.8 centimetres.The middle position that menstrual fluid is added to its upper surface that substitutes with 15 milliliters.Substitute menstrual fluid and be and a kind ofly have the salt content of menstrual fluid and the liquid of surface tension properties,, and pollute liner so color is also the same with it.

To one be the perforation sheeting, be placed on respectively on the pad that has polluted, ask one ten people's judgement group, press the order of maximum masking ability, the sheeting of variant eye with holes is lined up.It the results are shown in Table 1.

As from top table 1 see, and between the screening ability of objective observed cladding material, good corresponding relation being arranged in the parameter-brightness of quantitative assay.

Example 2

Prepare a series of tape punching sheetings that different openings area and different content of titanium dioxide are arranged.Nearly 1 mil of each thin slice (mil) is thick, and mainly is made of polyethylene.In addition, prepare the thin slice sample of an eye with holes, thick 2 mils, and 58.5% aperture area is arranged.Detect the brightness of these samples, test method is described with example 1.See Table 2 and this result of the test of Fig. 8 graphical report.

Can obviously find out by Fig. 8, have high luminance values, be ratio greater than about 45, especially more than 47, all concentrate in this zone of low aperture area and high titanium dioxide concentration about.When aperture area less than about 35%, be preferably less than approximately 30%, titanium dioxide concentration preferably greater than about 7% o'clock, can obtain satisfied brightness greater than about 5% simultaneously.

Table 1

The mutual relation of brightness and screening ability

Sample opening area TiO ₂(weight %) brightness results

1 27.4 7.5 52.4 10 philtrums, 10 people evaluate best

2 35.4 5.0 47.0 10 philtrums, 10 people evaluation is taken second place

3 43.3 3.8 36.1 10 philtrums, 7 people evaluate the 3rd

4 48.0 1.5 31.4 10 philtrums, 7 people evaluate the 4th

Table 2

Sample TiO ₂(weight %) aperture area (%) brightness

1 7.5 22 58

2 7.5 27.5 53

3 10.0 35.5 49.5

4 5.0 25 51.5

5 5.0 27 51

6 5.0 35 48.5

7 3.0 43 41.5

8 1.5 33.5 42.5

9 1.5 34.5 42.5

10 1.5 37.5 40

11 1.5 43 39

12 1.5 48 34.5

13 0.0 33.5 13

14 7.8 58.5 35

Claims (7)

1, a kind of product that is used for absorb body fluids, comprise an absorbent cores, absorbent cores has fit and subsides clothing face, wherein improvements are, the described fit covering surface layer of having worn, this surface layer comprises and contains polyolefinic continuous slice that described polyolefin is selected from polyethylene, polypropylene or their copolymer; Described thin slice has the eyelet that can allow body fluid to pass through; Described thin slice contains the opacifier of 5-12% (weight); The aperture area of described eyelet accounts for the 1.3-35% that desires to make the gross area that body fluid passes through, but the amount of aperture area still is not enough to the brightness of film is reduced to below 45.

2, by the product of claim 1, the aperture area quantity not sufficient of wherein said thin slice is to reduce to the brightness of film below 48.

3, by the product of claim 1, wherein said thin slice contains the titanium dioxide as opacifier.

4, by the product of claim 1, wherein said thin slice is the Web materials that comprises the land that is connect by crest line, and described land and described crest line define described eyelet.

5, by the product of claim 1, be used as sanitary towel.

6, by the product of claim 1, be used as throw-away nappy.

7, by the product of claim 1, be used as Wound bandage.

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