CN1095915A - Absorbing products with foam baffle - Google Patents

Abstract

A kind of absorbing products, it includes the foam overcoat of the surface layer of a liquid permeable, an absorber, a liquid impermeable and one this absorber is bonded in the hot-melt adhesive thin layer of this foam overcoat, and this overcoat is the thickness and the about 0.0225g/cm that have between about 0.51mm to 1.54mm ³To 0.0962g/cm ³Between the polyolefin foam of density.

Description

Absorbing products with foam baffle

The present invention relates to a kind of absorbing products once, it has the skin layer of a liquid permeable, a foam overcoat and the absorber between them, the invention particularly relates to a kind ofly as the overcoat of liquid impermeable with hot-melt adhesive the foam thing to be bonded in absorbing products on the absorber with the foam thing.

The easy absorbing products of settling, as sanitary towel, menopad, panty-liners, training pant, clothing that can not self-care person, diaper and analog, the body worn that is designed to the people is to sponge the liquid that human body is discharged, disposable absorbent article generally includes the absorbent pad between the egative film of a non-woven fabrics last slice that is set at a liquid permeable and a liquid impermeable, the egative film of liquid impermeable prevents that absorbed liquid from leaking out from absorbent article when, non-woven fabrics last slice siphons away waste liquid and sucks the absorbability core from the skin that is in contact with it, except that these parts, proposed many variations of these basic building blocks and add thereon adnexa, each variation or adnexa are used for improving article characteristic; ,, can expect that absorbing products has can make liquid infiltrate the characteristic of the top thin layer of liquid permeable as long as a large amount of liquid is absorbed by core regardless of concrete structure.

Overcoat by a liquid impermeable makes the unlikely underwear of getting wet and being surrounded of body fluid that infiltrates core.Overcoat is the polyethylene film with about 0.001 to 0.005 inch (0.025 to 0.13mm) thickness normally, selectively, a kind of contact adhesive can be put on overcoat on the one side of clothes, such binding agent can be fixed to absorbing products on the coupling part of a underwear, and these goods can be taken when making dirty.

For convenience of description; here an a kind of panty-liners or extremely thin absorbent pad that is used for feminien hygiene of main narration; it not only is used at mensal menstrual phase protection underwear, and intermenstrual period and twice month through between absorb a spot of trickle.But, should understand, it only is panty-liners that the embodiment of this recommendation that this invention is provided does not limit the invention to.

Before this, when panty-liners of structure, the fibre object that provides certain methods will constitute the absorbability core is combined together to form a thin layer, so that this lamination can not separate and/or fibre thin layer is bonded in adjacent thin layer.

In prior art, certain methods is used, a kind of method is to encapsulate fibre object in a shell, become bonding periphery to be combined together to form this shell by sealing with skin layer and overcoat, these thin layers are used a kind of non-woven material always, and by heating or bonding adhering to each other.

Another kind method is to add thermoplasticity powder, fibre object or fubril to fibre thin layer, and at the tread support membrane of heating laminated into type with the thermoplastic of formation perforating fiber matter thin layer, form bonding between the thin layer of a thermoplastic film and adjacent thermoplasticity liquid permeable and liquid impermeable in addition, laminated product is molded when heating is provided usually, so that bonding occurring in basically in the zone that is molded.

Crosslinkable emulsus binding agent also has been used for the absorbency fiber thing is bonded together, and is used for adjacent thin layer is bonded together.A problem in the mode of this use emulsus binding agent is that this binding agent is inhaled in the absorbency fiber thing at least in part, and this may weaken the performance of absorbency fiber thing; Using the emulsus binding agent will absorb another problem that fibre object is bonded together is that the result makes these goods not too comfortable for wearer because of the hardness that has an increase after the absorbency fiber thing drying.

Die forming has also used in this structure, so that the emulsus binding agent flowed into the thin layer that is molded before solidifying.

Another patent documentation has disclosed a liner with absorbency fiber thing, and this absorbency fiber thing is placed in the shell of a fabric or non-woven fleece, by the whole periphery of high pressure pressed lining, its edge is sealed.But when the whole periphery of panty-liners is suppressed fully or compressed when sealing its edge, stiff relatively and sharp edge just form the thing as abrasive material.

So produce a kind of panty-liners, make its on producing, have low cost, to wearer be softish and comfortable, in use have elasticity and absorbability, this is technical desired.

Put it briefly, the present invention relates to a kind of absorbing products, it has foam overcoat and a hot-melt adhesive thin layer of the skin layer of a liquid permeable, an absorber, a liquid impermeable; The thickness of this foam overcoat greatly about between the 0.51mm to 1.54mm, density is greatly about 0.0225g/cm ³To 0.0962g/cm ³Between, it has a surface and the surface towards clothes towards absorber; This hot-melt adhesive thin layer is applied in surface towards absorber so that absorber is bonded on the foam.

In the embodiment of a recommendation, this absorbing products is thin, an elongated panty-liners, and polyethylene overcoat is used as the backing of a liquid impermeable thereon.This skin layer, absorbability core and foam overcoat have common edge.

Whole panty-liners can be used as with a underwear next to the shin and combines, and need not add connecting device.Preferably a kind of clothes auxiliary binder of pressure sensitive is set at the expanded polyolefin overcoat at least on the part on the surface of clothes, but cover the bar that strip off is removed on it, this bar can be by the user strip off, to guarantee to connect more reliably effect.

General purpose of the present invention provides a kind of absorbing products, and it is with the overcoat of a kind of polyolefin foam as a liquid impermeable; Of the present invention one more particularly purpose provide a kind of panty-liners, it is simpler, production cost is lower, more comfortable for wearer.

Another object of the present invention provides a kind of more softish absorbing products, and the control of improvement to liquid is provided.

By following description and with reference to accompanying drawing, to those technical skilled personnel, other purpose of the present invention and characteristics just become more obvious.

Fig. 1 is a plane graph as the absorbing products of panty-liners;

Fig. 2 is the profile along 2-2 line among Fig. 1;

Fig. 3 is the perspective view of absorbing products bottom surface, shows an outer bar that adheres to;

Fig. 4 is the sketch map of the production method of absorbing products shown in Figure 1.

See figures.1.and.2, a kind of absorbing products 10 is shown as a panty-liners, though do not draw, other contemplated within the scope of the invention absorbing products comprises: diaper, can not take care of oneself adult clothing, training pant, sanitary towel and analog.This panty-liners 10 has the top layer, top 12 of a non-woven material, impresses the pattern line 14 that extends longitudinally in mode at interval on it.This pattern line 14 is extended on the total length of panty-liners 10, and as shown in 15 the end and the edge of interrupted DIYU and panty-liners 10 intersect, therefore the major part 16 that stays periphery in Z direction (with reference to Fig. 2) is not molded with bonding.Absorber 17 of forming by the absorbency fiber thing be set at surface layer 12 below, and compacted along pattern line 14, this pattern line 14 provides the hydrogen bonding (hydrogen bonding) of fibre object in zone 18.This hydrogen bonding makes absorber 17 and surface layer 12 be bonded as one fully to prevent the delamination in the Z direction.Surface layer 12 is swelled, and at 14 profiles that curve as mat of pattern line, this moment absorber 17 malcompression and not stick portion upwards oppress surface layer 12.A kind of hot-melt adhesive 19 is sprayed on the absorber 17, and a foam overcoat 20 adhesively connects thereon.

The surface layer 12 of nonwoven can be any in the non-woven material of liquid permeable of many known types, and this non-woven material can permeation liquid and chafe not.For example, this surface layer 12 can be made by the carded lamella (carded web) of polyester, polypropylene, nylon or other thermal bonding fiber thing, a kind of preferable material is a kind of nonwoven lamella of staple fibre of stable bonding, and a kind of preferred material is a kind of spunbond polypropylene fabric.The spunbond lamella of continuous fiber, as polyethylene, polypropylene, polyester, nylon and analog, kept a very dry surface in use, a kind of material of the best is that Unit Weight is greatly about the spunbond polypropylene thin layer between the 10gsm to 40gsm, wish that spunbonded materials comprises a kind of bleach, as titanium dioxide (TiO ₂) or calcium carbonate (CaCO ₃), because its color has good stain to cover up performance, to cover the body fluid that has infiltrated in the absorber 17.Spunbond thing also has enough intensity, tears or collapses so that in use surface layer 12 is unlikely.

Absorber 17 can be any absorbent material, and material commonly used comprises the combination of wood pulp goods, cotton, staple fibre, polyester, conformal thing (coforms) and these absorbency fiber things.A kind of preferable material is (devilizated) wood fiber fine hair of discerping, because its cost is low, this fine hair can further comprise the high-absorbable cross linked polymer, and it is commonly referred to as and is super-absorbent material, or as a discrete thin layer, or be used for mixing with described fibre object.Preferably this fibre object has big length between 0.5 to 10mm, and many methods of making absorber are known technically, therefore just needn't describe these methods here.

By hydrogen bonding and heating, pattern line 14 is bonded in the wood pulp cellulose in the absorber 17 on the surface layer 12.The hydrogen bonding of wood pulp cellulose thing is a kind of like this combination, promptly when thin layer drying, the basis set formation hydrogen bonding of adjacent fibriilar hydrogen-oxygen in the cellulose fibre, under this state, bonding being formed in the mold process, this bonding as a kind of absorber 17 that keeps in the intensity of Z direction and the method for globality.By adhesively foam overcoat 20 being connected on the absorber 17, enough intensity and globalities on Z and Y direction, are provided.Use X, Y and Z symbol in the mode of custom here, as depicted in figs. 1 and 2, X, Y are respectively vertical and horizontal, and the Z direction is perpendicular to them.It is hydrogen bonding that the main method of the globality of panty-liners on the Z direction is provided, and the purpose of pattern line setting also provides the full surface of panty-liners except that hydrogen bonding is provided, comprise edge softish, similar pillow structure.

Pattern line 14 is ripple or corrugated line preferably, in use, when panty-liners bent to arc, wave might be more conducive to bending than straight line, this bending only produces small-scale wrinkle, and the discomfort in the sense of touch that can not occur causing by big wrinkle.

Pattern line 14 also guides absorbed liquid to flow along the X-X axis, because the edge of panty-liners does not seal, whenever possible, making absorbed liquid is desired away from these edges, the pattern line 14 of longitudinal extension just is being applicable to this purpose, and plays water channel, because they are in compacted state, in absorber 17, provide the fine pore, so increased absorption pressure capillaceous.

In fact binding agent 19 can be the hot melt viscosity synthetic of any water insoluble or impermeable water, for convenience, recommends to use in the structure of concrete absorbing products a kind of in the hot-melt adhesive of being used by Producer usually; Hot-melt adhesive 19 has cold bonding improving its viscosity, and absorber 17 is adhered on the foam overcoat 20; Binding agent 19 is atomized into very little spherical or fibrous particle by hot gas, and puts on the foam overcoat 20 in the mode of even spraying; Suitable hot-melt adhesive is Findley 593-335, it is a kind of mixture of ethylidene vinylacetate, and Findley 582-371 and multiple amorphous polypropylene all can be buied from the Findley Adhesives Inc that is positioned at 11320 Watertown Plank Rond, Wanwatosa, Wisconsin; The usage range of the hot-melt adhesive quantity that is applied in is greatly about between the 1gsm to 15gsm, and particularly binder amount is greatly in the scope of 5gsm to 12gsm.

With reference to Fig. 2 and Fig. 3, foam overcoat 20 can be made by lightweight foam polyolefin material, this material has two or more surfaces and can be applied by binding agent, this foams can be the crosslinked of a closed pore or a noncrosslinking foam polyolefin material, preferably a kind of polypropylene of this expanded material or polyethylene foam, and polyethylene is preferred, particularly preferably is a kind of noncrosslinking polyethylene foam.

This foams must be flexible, and can form thin layer; The standard that provides according to ASTM D3575, this foams should have one greatly about the thickness between the 0.51mm to 6.35mm, preferred one big about the thickness between the 0.51mm to 1.54mm, preferred thickness is greatly about between the 0.76mm to 1.27mm, and most preferred thickness is greatly about between the 0.76mm to 1.02mm.

This foams should have one greatly about 0.0225g/cm ³To 0.962g/cm ³Between density, preferred density is greatly about 0.0322g/cm ³To 0.0642g/cm ³Between, most preferred density is greatly about 0.0354g/cm ³To 0.0482g/cm ³Between; Being preferably in foamy hole is subjected to before any compression, just being extruded the back at foamed materials just measures its thickness and density, this compression may take place in processes such as subsequently processing, packing, and this measurement also should be carried out before it may change the processing method of foam characteristic and technology.Plan in the present invention to adopt the foamed materials sample that supply of commodities is arranged to comprise the foamed materials of commodity CA-30 by name, it is by being positioned at 19-01 State Highway 208, Fair Lawn, the Sealed Air Corp of New Jersey produces, and the foam of commodity AF-030 by name, it is by being positioned at 18 Peck Ave., Glens Falls, the Astro-Valcour of New York, Inc. produces.

With reference to Fig. 3, foam overcoat 20 what disposed on the surface of clothes is the stick portion 22 of a pressure sensitive that extends longitudinally, be used for panty-liners 10 is attached on the crotch part of underwear; Though this stick portion is next illustrational with the preferred form of vertical ribbon, can think all to be suitable for various forms as point-like or horizontal stripe.

Employed binding agent can be any in the binding agent of various pressure sensitives, the infinite example of these binding agents is those hot melt cementitious compositions, these compositionss be with ethylene/vinyl base second resin copolymer, the upright structure of full rule or atactic polypropylene, styrene-butadiene, styrene-isoprene, styrene-ethylene-butylene A-B-A or A-B-A-B block copolymer be base; These binding agents are with trade name Kraton ^R, Solpr-ene ^RAnd Stereon ^RSell; Except a basic polymer, this hot-melt adhesive also comprises viscosifier, oils and/or paraffin, and additional packets contains stabilizing agent, non-oxidiser, pigment and analog usually in addition; A kind of preferred adhesive is 34-2823, and it is from being positioned at Finderne Ave., Bridgewater, the National Starch and Chemical Co. of New Jersey

Usually by suitable known way, apply or spraying technically, but on the additional stick portion 22 of clothes, provide strip off rectangular 24 as slit; The amount of binding agent 22 is preferably approximately between the 10gsm to 40gsm, preferably approximately between the 18gsm to 30gsm, most preferably approximately between the 18gsm to 25gsm; Even the amount of binding agent 22 is enough to the bonding panty-liners of living, will be appreciated that also to require more the binding agent of volume to come the bonding special structure of living.

The method for optimizing that garment-adhesive 22 is adhered on the foam overcoat 20 discloses in the U.S. Patent application U.S.No-that submits on the same day common transfer, that carry out just at the same time, and this discloses the part by citation formation this paper.

But on binding agent 22 strip off rectangular 24 of protectiveness; this rectangular 24 is provided and is used for protecting before use binding agent 22 to avoid staiing and unconsciously bonding; a kind of useful especially material is the kraft paper of half bleaching; the side of its contact adhesive scribbles organic siliconresin, so that it is thrown off from stick portion easily.

With reference to Fig. 4, a suitable method of producing panty-liners 10 has been described; The surface layer 110 of a liquid permeable has an air charge and is placed on thin, absorbed layer 130 uniformly on the one surface, and surface layer 110 and absorbed layer 130 are extruded between two rollers 140 and 145 with this absorber of densification; Roller 140 and 145 is selectively supplied with enough pressure, and heating when needed, so as with surface layer 110 hydrogen bondings on absorber 130, and a kind of decorative pattern of mold pressing thereon; A foam overcoat 150 is unfolded from a charging volume 160, and is gone up a kind of hot-melt adhesive 165 by 170 sprayings of a sprayer; As a kind of replacement,, also can on absorber, spray hot-melt adhesive 165 at absorber 130 with before foam overcoat 150 contacts though do not show; Foam overcoat 150 is applied on the absorber 130, but an applicator 175 applies a kind of clothes auxiliary binder 177 on a surface of strip off rectangular 180, binding agent 177 is by 190 heating of a heater, when binding agent 177 contact foam overcoats 150, binding agent 177 is completely melted and allows bonding; Though optional, can strengthen the bonding of clothes auxiliary binder 177 by one or more backer rolls 195,196 and 197; After bonding, laminated product (being made up of surface layer 110, absorber 130, binding agent 177 and foam overcoat 180) is die-cut into a kind of required shape 200, and packages in order to shipment.

When using panty-liners of the present invention, but the method for recommendation is that strip off rectangular 24 is torn from foam overcoat 20, to expose clothes aid adhesion part 22, then panty-liners 10 is aimed at and is pasted on the crotch part of a underwear in mode commonly used.

The panty-liners that constitutes according to the present invention is found has strong water absorbing capacity, and in addition, this panty-liners is that approach, softish and flexible, is comfortable to wearer therefore.

Another advantage is that this panty-liners is resilient, and the suitable surface that is affixed on health, to reach good pad effect.

Though the present invention is described in conjunction with a special embodiment, can think the people who is proficient in this technology for those, it is conspicuous carrying out various conversion, remodeling and variation according to aforesaid content; The general modification that for example comprises absorbing products such as baby diaper, incontinence adult clothes, training pant, Wound bandage, sanitary towel and analog can both embody the present invention; Therefore present invention includes all remodeling and variation in the spirit and scope that belong to claims.

Claims (19)

1, a kind of absorbing products is characterized in that including:

The surface layer of a liquid permeable;

An absorber;

The foam overcoat of a liquid impermeable, its thickness are greatly about between the 0.51mm to 1.54mm, and its density is greatly about 0.0225g/cm ³To 0.0962g/cm ³Between, these foams have a surface and the surface towards clothes towards absorber;

Hot-melt adhesive thin layer put on this on the surface of absorber so that this absorber is adhered on these foams.

2, goods as claimed in claim 1 is characterized in that: these foams are a kind of polyolefin foams.

3, goods as claimed in claim 2 is characterized in that: this polyolefin foam is a polypropylene.

4, goods as claimed in claim 2 is characterized in that: this polyolefin foam is a polyethylene.

5, goods as claimed in claim 2 is characterized in that: the thickness of these foams greatly about between the 0.76mm to 1.27mm, density is greatly about 0.0322g/cm ³To 0.0642g/cm ³Between.

6, goods as claimed in claim 5 is characterized in that: the thickness of these foams greatly about between the 0.76mm to 1.02mm, density is greatly about 0.0354g/cm ³To 0.0482g/cm ³Between.

7, goods as claimed in claim 1 is characterized in that: this amount that is applied in the hot-melt adhesive on the foams is greatly about between the 1gsm to 15gsm.

8, goods as claimed in claim 7 is characterized in that: this amount that is applied in the hot-melt adhesive on the foams is greatly about between the 5gsm to 12gsm.

9, goods as claimed in claim 1 is characterized in that further including:

A kind of garment-adhesive of pressure sensitive, it is measured greatly about between the 10gsm to 40gsm, and it is applied in this on the surface of clothes;

A peelable bar.

10, a kind of absorbing products is characterized in that including:

The surface layer of a liquid permeable;

An absorber;

An expanded polyolefin overcoat, its thickness are greatly about between the 0.51mm to 1.54mm, and its density is greatly about 0.0225g/cm ³To 0.0962g/cm ³Between, these foams have one towards the surface of absorber and one on the surface of clothes;

A hot-melt adhesive thin layer puts on this on the surface of absorber, so that this absorber is adhered on these foams.

11, goods as claimed in claim 10 is characterized in that: this polyolefin foam is a polypropylene.

12, goods as claimed in claim 10 is characterized in that: this polyolefin foam is a polyethylene.

13, goods as claimed in claim 10 is characterized in that: the thickness of these foams greatly about between the 0.76mm to 1.27mm, density is greatly about 0.0322g/cm ³To 0.0642g/cm ³Between.

14, goods as claimed in claim 13 is characterized in that: the thickness of these foams greatly about between the 0.76mm to 1.02mm, density is greatly about 0.0354g/cm ³To 0.0482g/cm ³Between.

15, goods as claimed in claim 10 is characterized in that: this amount that is applied in the hot-melt adhesive on the foams is greatly about between the 1gsm to 15gsm.

16, goods as claimed in claim 15 is characterized in that: this amount that is applied in the hot-melt adhesive on the foams is greatly about between the 5gsm to 12gsm.

17, goods as claimed in claim 10 is characterized in that further including:

A kind of garment-adhesive of pressure sensitive, it is measured greatly about between the 10gsm to 40gsm, and it is applied in this on the surface of clothes;

A peelable bar.

18, a kind of panty-liners is characterized in that including:

The surface layer of a liquid permeable;

An absorber;

The expanded polyolefin overcoat of a liquid impermeable, its thickness are greatly about between the 0.76mm to 1.02mm, and its density is greatly about 0.0354g/cm ³To 0.0482g/cm ³Between, these foams have a surface and the surface towards clothes towards absorber;

A hot-melt adhesive thin layer is applied in this on the surface of absorber, so that this absorber is bonded on these foams.

19, goods as claimed in claim 18 is characterized in that further including:

A kind of garment-adhesive of pressure sensitive, it is measured greatly about between the 10gsm to 40gsm, and it is applied in this on the surface of clothes;

A peelable bar.

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