Fibrous structure and an absorbent article containing such fibrous structure
Described fibrous structure designed for use in particular in hygiene articles such as diapers, sanitary pads, protective gear used incontinence products for drying, etc., having one or more kinds of silicon-containing polar compounds associated at least with one part of the surface of the fibrous structure due to the interaction between the surface and organosilicon compounds, resulting fibrous structure will have a predetermined degree of hydrophilicity and adhesion properties, which essentially has no effect wetting of the fibrous structure. In addition, the invention relates to absorbent, hygienic and textile products containing such fibrous structure. 2 C. and 12 C.p. f-crystals, 2 Il.The present invention relates to a fibrous structure (or a woven or non-woven type, natural or synthetic, and so on). As is well known, such fibrous structures are used in many industrial manufactured products, such as below as an illustration, without any restrictions:- ghiceasca strip, protective equipment used in case of incontinence products for drying, dressing on the wound, face masks and so on,- products of industrial applications, for example, intended for use in products for insulation (thermal, electrical) or in products for filtration, or floor coverings,- textile products.Depending on the type of fibrous structures and considered applications there is a particular need in the properties of hydrophilicity and/or adhesion.If we consider as an example a non-woven material, can be say that they are made of a relatively hydrophobic synthetic fibers, such as fibers of polypropylene or polyethylene, which are processed and/or in which form the holes to make a material permeable to the liquid.To obtain the absorbent fluid environment products that have a good ability to absorb large General and local ability to absorb fluid, a good ability to hold fluid and a high degree of dryness of the surface, such products are usually created from a variety of different non-woven fibrous structures having different functiion, it is difficult to achieve optimum wettability, that is, the optimal degree of hydrophilicity, which remains unchanged after the product is subjected to wetting. In addition, it is difficult to obtain stable values of wetting for absorbent products that are stored for an extended period of time.In document WO 91/05108 it is experimentally shown that there is a correlation between increased surface area and increased speed of absorption. The patent application refers to fibers which have been provided with a porous layer attached to the surface of the fibers. The porous layer increases the specific surface of the fibres, which means that the absorbent material containing such fibers, provides increased absorption rate and absorption.The porous layer is generated by the impregnation of the fibrous material hydrophilic chemicals when the fibers are dry or wet, respectively, in the form of dehydrated fibrous mass or in the form of an aqueous suspension of fibers. Processing may be performed by inputting the fibers in contact with hydrophilic chemicals, for example, by spraying chemical solution into fibers, in the form of formulas the form of solids, in solution or in any industrial output.As for permeable to fluid covering sheets intended for use in absorbent products such as diapers, protective devices used in case of incontinence and sanitary pads, in which the covering sheet is intended to be in contact with the user's body during use, it is important that the covering sheet is able to withstand repeated wetting.In other words, the cover sheet must remain permeable to fluid even after the absorbent article is exposed to the fluid several times. In addition, it is important that the covering sheet can absorb large quantities of fluid in a short amount of time. Another important property is permeable to fluid covering sheet is the ability to demonstrate a high surface dryness even after its exposure to several skachivaniya. To obtain a covering sheet having the desired properties, it is important that the covering sheet had optimal, given that the degree of hydrophilicity and to the extent hydrofilm is whether when it is subjected to aging.As is well known to the person skilled in the art, the literature on these issues are considered properties “hydrophilicity” or “wettability” basis or “adhesion” of the third body on the basis of and often reported measurement data “surface tension”, “wetting angle” and “tests for delamination to evaluate such properties.A widely used method of increasing the wettability permeable to fluid covering sheets intended for use as cover sheets in absorbent products is the treatment of the material surface-active substances. Non-woven material used as a covering sheet for an absorbent product, usually made from synthetic materials, which are inherently hydrophobic and who were treated with surfactants to make them wettability and the ability to be permeable to fluid. Processing is usually performed by coating a hydrophobic material surface-active substance. That the material have the property of wetting fluid medium, the wetting angle between the surface material and the fluid medium should sostavlyavshego-active substance, is that with repeated wetting permeability of such cover sheets in relation to fluctuating environments is reduced. The reason for this is that the applied surfactant is not attached firmly to the surface of the covering material and will be separated from the covering material and to dissolve in the excreted body fluid during the first wetting. Therefore, the amount of surfactant that remains on the surface of the covering sheet in the subsequent skachivaniya, significantly decreases, which leads to the deterioration of the permeability with respect to the flowing medium.Another problem associated with the use of products having a coated surface-active substance covering the leaves, is that surfactants can migrate out of the covering sheet to the skin of a user, thereby causing skin irritation.An additional problem associated with absorbent articles having a covering sheet of this type is that during storage of the product surface-active substances can migrate from the cover sheet in an absorbent structure, resulting in pronica and fluid.Another problem associated with the covered surface-active substance covering the leaves, is that the method of applying a surface-active substances are less attractive from an environmental point of view, since the surfactant is usually applied on the surface of the material in the form of a solution, which, for example, is sprayed on the surface with the contact surface-active substance into the surrounding air.In accordance with the present invention developed fibrous structure mentioned in the introduction of the type. The fibrous structure has optionally a precisely defined speed of wetting, that is, a given degree of hydrophilicity, which is essentially not affected by the wetting of the fibrous structure and/or adhesive, which is essentially not affected by the wetting of the fibrous structure.In addition, in accordance with the present invention developed a fibrous structure in which the desired, predefined degree of hydrophilicity and adhesion properties are retained even after a period of time during which the structure will be stored. Accordingly, the present invention pozvolyaetsya according to the invention primarily differs by one or more kinds of silicon-containing polar compounds, associated at least with one part of the surface of the fibrous structure due to the interaction between the surface and the silicon-containing compounds.As mentioned above, the fibrous structure according to the invention has a preselected degree of hydrophilicity and adhesion properties, which are essentially not affected by the wetting of the fibrous structure.In accordance with one embodiment of organosilicon compound comprises compounds of the type SiOxHyin which x is preferably in the range from 1 to 4, and y is preferably in the range of from 0 to 4.The advantage of the fibrous structure of this type is that it has been proven that the characteristics of the patterns that characterize its ability to wetting, remain essentially constant during the wetting and that the fibrous structure has a comparative resistance to aging.Not being in any case limited to the following theoretical explanation of why the hydrophilic surface having a polar organic silicon compound has a stable hydrophilic and adhesive properties after repeated wetting and after start the th cluster, which are large enough to slow the orientation of polymer chains and, consequently, delay the manifestation of the effects of aging. However, theory is not fully developed, and therefore, it should not be considered as related to the invention.As already mentioned, the fibrous structure in accordance with the invention have at least one surface or surface material with polar, silicon-containing compounds. However, according to the invention can be applied silicon-containing compound to both surfaces of the sheet material. In addition, one or both surfaces of the material can have one or more restricted zones having a silicon-containing polar compounds.In accordance with one aspect of the invention fibrous structure contains one or more nonwoven materials.In accordance with one further aspect of the invention fibrous structure according to the invention can be used, such as permeable to fluid covering sheet for an absorbent product or as a layer, providing transfer fluid between permeable to fluid covering sheet and the absorbent structure is named aspect of the invention fibrous structure according to the invention can be used as a fluid-absorbing articles for drying or as an element in the product to dry or etc.In accordance with another aspect of the invention fibrous structure may contain one or more layers of cosmetic paper.As is well known to the person skilled in the art, the term “cosmetic paper” usually refers to a fibrous material based on cellulose or cellulose in combination with synthetic fibers, which, as a rule, used in the manufacture of household products such as kitchen towels, toilet paper or napkins, in the production of articles for drying used in industry for absorption of various liquids, or for the manufacture of layers making up the structure of absorbent products such as diapers, protective devices used in case of incontinence, sanitary pads, or etc.In addition, the invention relates to an absorbent product such as a diaper, a protective device which is used in case of incontinence, a sanitary pad or similar, containing the absorbent body enclosed between the non-permeable to fluid covering layer and permeable to fluid covering layer, and the specified product contains at least one part containing fibrous structure in accordance with Kryvyi layer and/or layer for transferring fluid, located between permeable to fluid covering layer and the absorbent body.In a hygienic product intended for the absorption of fluid and made of multiple layers, the movement of fluid between the various layers is very important both from the point of view of speed of absorption within each individual layer, and from the point of view of General ability and hygienic products to absorb fluid. From the foregoing it is obvious that for absorbing fluids products of this type it is very important that all layers of the material had a well-defined and stable degree of hydrophilicity, which varies only in a very limited wetting and aging.In accordance with one aspect of the invention is permeable to liquid covering layer, providing transfer fluid layer and the absorbent body have different degrees of hydrophilicity.In accordance with one of preferred embodiments of the invention provide transfer fluid layer hygiene products contains a set of short fibrous structures according to the invention, with this kit fibrous structures characte, such as the product to dry, the dressing on the wound or similar containing fibrous structure according to the invention.In addition, the invention relates to a method for producing fibrous structures having one or more kinds of silicon-containing polar compounds, corresponding at least to the surface of the fibrous structure. The method is mainly characterized in that the fibrous structure is exposed to atmosphere containing excited and unstable components, obtained by electrical discharge in the initial mixture containing transport gas, oxidizer and at least one kind of silicon-containing gaseous compounds.The advantage of this method of this type is that it is in dry mode, which implies that there is no need to dissolve the silicon-containing compound in the solvent before applying, which means that the preferred method from an environmental point of view.In accordance with the preferred embodiment, the processing based on the electric discharge is carried out in a gaseous mixture, which leads to the formation of plasma.As is well known, the plasma is sabaabyt obtained by feeding the gaseous mixture to sufficient energy at a certain pressure, for example, very low pressure or atmospheric pressure.All plasma components can react with each other and/or with components of the gaseous mixture for the formation of new ions, radicals and excited components.In that case, when it is at atmospheric pressure when applying an electric signal of high voltage as an energy source, the plasma is usually called “corona”.Therefore, in accordance with this preferred embodiment of the fibrous structure is exposed to an electrical discharge in the presence of a gaseous mixture containing at least one kind of silicon-containing gaseous compounds, oxygen or other oxygen-containing gas and carrier gas.In accordance with another embodiment of the invention fibrous structure is treated by its exposure to the effects of the atmosphere, obtained after the electric discharge, is fed to the gaseous mixture containing at least one kind of silicon-containing gaseous compounds, oxygen or other oxygen-containing gas and carrier gas (in this case, the fibrous structure is treated pudarnya components of the atmosphere react with the polymer chains to the surface of the fibrous structure, which leads to the formation of the radicals mentioned polymer chains. These radicals can then react with components available near radicals, thus forming a new chemical bond and new functional groups on the surface. Functional groups that are important for the present invention are silicon-containing polar group. The functional group introduced to the surface of the material, much more strongly bound to the surface compared to the active substance was applied as a normal floor.The processing method in the corona discharge is described in U.S. patent 5576076, 5527629 and 5523124. The gaseous mixture is generated based on the carrier gas, which is typically nitrogen, silicon-containing compound and an oxidant. When processing a layer of material having a glassy, hydrophilic surface.The described method is suitable for use in connection with the invention. However, the invention is not limited to the method described in the aforementioned documents, but covers all types of processing in the gaseous phase, in which the silicon-containing polar group introduced into the surface of the fibrous structure. what and is a silane compound. Some examples of such compounds include compounds with the formula SinHn+2where n is preferably from 1 to 4, a hydroxide of silicon, halogenated silane, alkoxysilane or organosilane. The oxidant preferably represents oxygen or other oxygen-containing gases, such as CO, CO2, NO, N2O or NO2. Transporting gas may comprise nitrogen, argon, helium or mixtures thereof.In accordance with one embodiments of the invention before exposure processing environment containing unstable and excited components resulting from the supply of electrical charge to a gaseous mixture containing a silicon-containing gaseous compound, the oxidizing agent and carrier gas, a fibrous structure on the first operation is exposed to a corona discharge in air (surface preparation).Other characteristics and advantages of the present invention will become apparent from the following detailed descriptions of preferred options for its implementation, taken together with the attached drawings, on which:Fig.1 shows the diaper, if you look at it from the side facing polling fibers.The diaper 100 shown in Fig.1, contains permeable to fluid covering sheet 101 which is impervious to fluid covering sheet 103 and the absorbent body 105, enclosed between the covering sheets 101, 103. Not permeable to fluid covering sheet 103 may consist of not permeable to fluid plastic film, sheet of non-woven material, which is provided with resistant fluid media coverage, or flexible sheet material of any other type, which is resistant to the penetration of fluid. Generally, it is preferable, if not permeable to fluid covering sheet 103 has a permeability at least to some extent, which means that water vapor can pass through the covering sheet.Covering sheets 101, 103 extend in a plane which is slightly more than the length of the absorbent body 105 in the plane, and contain marginal portion 107, which support the peripheral edge of the absorbent body 105. Covering sheets 101, 103 are connected in the area of the protruding edge parts 107, for example, using an adhesive or by heat sealing or ultrasonic welding.In addition, the diaper 100 has two passing Yuyu part 113, the rear portion 115 and an intermediate portion 117, which is narrower than the end portion 113, 115.In addition, along the side edges 123, 125 in the perineal part 117 of the diaper are elements 119, 121. The purpose of the elastic elements 119, 121 is to form a means for maintaining the diaper around the legs of the user in close contact with the foot when wearing the diaper. Additional elastic element 127 is located along the rear end edge 111 and is provided in order to give the diaper 100 for a degree of extensibility and prelevement and to serve as a sealing means to prevent leakage in the area of the waist.On each side edge 123, 125 near the rear end edge 111 is the tongue 129, 131 of the adhesive tape. The tabs 129, 131 of the tape form a fastening means for diaper 100 and provide the ability to convert the diaper 100 in the garment covering the lower part of the body of the carrier is similar pair of panties. The tabs 129, 131 of the adhesive tape interact with the receiving area 133, located on a non-permeable to fluid covering sheet 103 on the front side 113 of the diaper. The receiving area 133 may be formed from a reinforcing materialone covering sheet 103 diaper can be closed and re-opened, this is not a negative influence on the adhesion properties of the reeds 129, 131 of the adhesive tape and is not permeable to fluid covering sheet 103 is not exposed breaks.Of course, you can use any of a number of different types of fastening elements. Some examples of such alternative fastening elements include surfaces with hooks and loops, push buttons, ties or etc.The absorbent body 105 generally includes one or more layers of cellulose fibers, such as Susanna cellulose.In addition to cellulose fibers, the absorbent body 105 may include a material with ultra-high absorption capacity (superabsorbent), which represents the material in the form of fibers, particles, granules, film, etc., and which has the ability to absorb the fluid in an amount several times greater than the weight of superabsorbent. The superabsorbents bind the absorbed liquid and form a liquid-containing gel.In addition, the absorbent body 105 may contain a binder, a means for stabilizing the forms, or so on, you can Also use additional absorbent layers to improve absorp the/p>The absorbent body 105 may be subjected to chemical or mechanical treatment to modify the absorption properties.Widely used way to increase the ability of the absorbent structure to absorb is the creation of an absorbent body having a specific configuration of the aggregate of the compressed zones. In addition, you can use absorbent materials such as absorbent non-woven materials, absorbent foam materials, or etc., Similarly, can be used all possible combinations of suitable absorbent material.Permeable to liquid covering layer 101 contains one or more layers of material, with at least one layer of material comprises a fibrous structure according to the invention.The fibrous structure according to the invention may include the structure of the top layer 106, which during use of the diaper 100 will be in contact with the body of the user, and/or in the structure of the bottom, providing transfer of the fluid layer, which is located between the upper skin contact layer 106, and an absorbent body 105, which is permeable to liquid covering layer 101, and/or structure is, and to allow transfer of the fluid layer are fibrous structure according to the invention, it is preferable that these layers were different from each other, the degree of hydrophilicity. For example, this can be achieved through the use of gas mixtures of different composition at processing various fibrous structures.The invention is not limited to material of a particular kind. Accordingly, the choice of polymer, the thickness of the fibers or the density of the fibers depends on the type of product (for example, absorbent articles), which is the fibrous structure, and functions and location of the fibrous structure in the product (in order to ensure the presence of hydrophilic properties or adhesive properties).As an illustrative example, we can specify that the fibrous structure is usually made of polypropylene, polyethylene, complex, polyester and their copolymers. However, do not limit the invention these polymers.As one example of suitable polymers of a different type are biodestruction polymers. In order biodestruction materials well to perform its function as a permeable d is or perforated material. As mentioned earlier, the conventional way of imparting wettability of the fibrous sheet material is a coating material surface-active substances, which are less favourable to the environment than is necessary. Accordingly, according to the present invention developed a tool for creating permeable to fluid covering sheet having a preferred environmental properties due to its ability to biodegradation, and due to the fact that it is possible to avoid the use of surface-active substances.Here are examples of fibrous structures according to the invention.Example 1 - measurement using electron spectroscopy for chemical analysisTo study the chemical composition of the surface material was followed by chemical analysis using electron spectroscopy. In photoelectron spectroscopy the surface of the material is irradiated with x-rays. X-rays are high energy leads to the fact that is accompanied by the emission of electrons from the surface of the material.The value of the binding energy of the emitted electron is obtained from the equation:Eb=h-Ek
FIELD: medicine, hygiene.
SUBSTANCE: the suggested product contains the mixture out of thermoplastic hydrophobic and absorbing fibers. Absorbing fibers are present in the quantity being sufficient to efficiently absorb liquid from external surface of combined covering and transmitting layer at no competition with absorbing middle layer to provide quick penetration of liquid at minimal reverse wetting.
EFFECT: higher efficiency.
19 cl, 2 dwg, 1 tbl