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 analysis

To 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- energy radiation.

X-ray energy is known, and the kinetic energy is obtained by measuring the velocity of the electron.

Thus, it can be obtained the value of the binding energy of the emitted electron, which means that there can be determined the chemical composition of the surface.

The samples of example 1

1. Untreated polypropylene non-woven material.

2A. Polypropylene non-woven material, which was subjected to the treatment by corona discharge according to the invention for introducing a silicon-containing polar groups at the surface of the material.

2b. Polypropylene non-woven material, which was washed after treatment in the corona discharge.

Below are the parameters characterizing the operating conditions under which the samples 2A and 2b were treated according to the invention:

The feed rate of non-woven material - 26 m/min.

Width of non-woven material - 0.65 m

Electric power corona discharge - 1690 W

Consumption of N2- 94 l/min

Consumption of N2About to 0.39 l/min

Consumption of SiH4- 0,115 l/min

Non-woven fabric was subjected to processing in two stages: at the first operation was subjected to processing in the corona discharge in air, and on the second operation was subjected to the processing is mevki material this operation is performed by immersing the material in the container with distilled water. The temperature of the distilled water is 37°C. the Material was left in the water for 15 seconds and then removed from the water and spread out evenly to dry.

The results for example 1 - the Concentration of oxygen and silicon (%) surface material:

The results show that the treated in a corona discharge non-woven material according to the invention has a concentration of oxygen, which is 31.9 per cent, and the concentration of silicon, which is 9.2%, on the surface of the material. The concentration of oxygen and silicon are retained even after washing material, as follows from the concentration values for sample 2b.

Example 2 - using weights Cana (Cahn scales) to determine the wetting angle fiber

Method was used, Wilhelmi (Wilhelmy''s method) to determine the contact angle of the fiber. The measurement was performed by using the installation representing Libra 200 Cana, which is shown in Fig.2. During the measurement, the fiber 201 is vertically suspended on an extremely sensitive balance 202. The container 205 for liquid mounted on the movable table 206 directly below the fiber 201. When the fiber 201 is immersed in the liquid 203, around fiber obray between the liquid 203 and fiber 201, can be positive or negative, depending on the surface properties of fibers and liquids. The force of gravity, which is a positive force, will occur when the wetting angle between the fiber and the liquid is less than 90°. When the system has a wetting angle which exceeds 90°, the liquid and the fiber will repel each other, which implies the occurrence of power. The force of attraction or repulsion is determined using the balance. Power is linked to the regional contact angle following expression:

F=Lp cos+mg-LlgA,

where F is a registered power (N);

Lis the surface energy of the liquid (j/m2);

- the circumference of the fiber (m);

- wetting angle on the boundary surface of the fiber - liquid - air ();

m is the mass attached fiber (kg);

g is the constant of gravity (m/s2);

L- density of fluid (kg/m3);

l is the length of the fiber in the wet state (m);

A - the area of the cross with the flax is a fact, what is known as the buoyancy force, which represents the loss of weight resulting from the displacement of a certain volume of liquid. In the computer (not shown), which has a program of calculations designed to determine the boundary wetting angles, these two parameters are usually eliminated, which leads to simplification of the equation to the following form:

F=Lp cos.

Wetting angle when the leakage and wetting angle at stream are determined, if the dynamic wetting angle is measured when the liquid flows on the surface is dry or when the liquid dripping from the wet surface. Accordingly, the value of the wetting angle when the leakage is when the fiber is dipped into the liquid and the wetting angle of contact of the drain-off is when the fiber is extracted from the liquid.

Balance 202 have three bowls (see Fig.2). The first bowl And has a precision of 10-6that makes it suitable for measurements of boundary corners wetting of the fibers. However, the scales can also be used to determine the surface energy of liquids when applied less sensitive, the second vial Century Scales tarli or etc. in the measurement process, bowls and sliding table 206 protects made with the possibility of sliding glass screens 207. In addition, the screens allow you to adjust the humidity and temperature of the air. To avoid the disturbing influence of fluctuations in process measurement scales are placed on a base (not shown).

The table on which you installed the container 205 fluid, can be raised and lowered by electric motor. Speed table 206 regulate using the computer and determine prior to the measurement. Other parameters that are entered into the computer before starting the measurements represent the surface energy of the liquid and the circumference of the fiber 201.

Before starting the measurement fiber 201 is fixed on the piece of tape 208, while the section of the fiber is free from adhesive tape. Fixed fiber 201 is clamped by means of a metal clamp 209 and overhang from the first bowl A. Before that scales 202 tazrout in a state where the first bowl And the hangs only metal clip 209. Liquid 203 for testing with a known surface energy is in the container 205 for liquid on the table 206 under the fiber 201.

Fiber 201 should hang perpendicular to the surface 210 of the liquid and must be formulated with the ESA measurement begins, the computer registers the zero line, then the table 206 rises. When one or a few millimeters of the length of the fiber 201 will be immersed in the liquid 203, the computer receives a command to stop the table.

After that, the table 206 is lowered. In the process of testing the force change along the length of the fiber is displayed on the computer display. When the measurement is completed, the curves characterizing respectively the leakage and runoff, selected representative areas. Thereafter, the computer calculates the edge angles of wetting by using equation Wilhelmi.

Measurement of boundary wetting angles were conducted at the elementary fibers taken from a nonwoven material with a surface density of 18 g/m2consisting of polypropylene. The fiber was immersed in a liquid container containing distilled water.

The samples according to example 2

1a. Polypropylene fiber of the raw nonwoven material,

1C. after storage of the raw nonwoven material under item 1A for three months,

2A. Polypropylene fiber non-woven fabric which had been treated by corona discharge according to the invention for introducing a silicon-containing polar group.2A,

2C. after storing treated in a corona discharge nonwoven material under item 2A for five weeks (without washing),

2d. after washing and subsequent storage treated in a corona discharge nonwoven material under item 2A for five weeks.

Below are the parameters characterizing the operating conditions under which the samples 2A, 2b, 2C and 2d were treated according to the invention:

The feed rate of non-woven material - 26 m/min.

Width of non-woven material - 0.65 m

Electric power corona discharge - 1690 W

Consumption of N2- 94 l/min

Consumption of N2O - 0,39 l/min

Consumption of SiH4- 0,115 l/min

On the first operation of non-woven material has been subjected to processing in the corona discharge in air, and on the second operation is subjected to the processing in the corona discharge with the introduction described above in this application of the gaseous mixture.

In the case of complete washing of the material, this operation is performed by immersion of the material in the container with distilled water. The temperature of the distilled water is 37°C. the Material was left in the water for 15 seconds and then removed from the water and spread out evenly to dry. Wetting angle was measured for the individual fibers of washed is)

1A 99/93°

1C 98/90°

2A 50/25°

2b 58/31°

2C 50/19°

2d 52/23°

The results show that the fibers of the raw polypropylene have a wetting angle which exceeds 90°, which means that these fibers are hydrophobic. On the other hand, polypropylene fiber non-woven fabric which has been subjected to processing in the corona discharge according to the invention with the purpose of introducing silicon-containing polar groups at the surface of the material have significantly lower wetting angle, as seen from the results for samples 2a-2d. After washing treated in a corona discharge of non-woven material wetting angle was changed from 50° to 58° for the angle when the leakage and from 25° to 31° for the angle of the drain-off, which means that the degree of hydrophilicity is maintained at a relatively constant level after washing material.

Sample 2C refers to the fibers of the treated in a corona discharge of non-woven material, which was stored for five weeks after the first measurement and the second measurement was performed in order to evaluate the influence of aging on the material.

It was found that the angle when the leakage is 50° for fibers of nonwoven material, which is 25° for the material, not affected by storage, and 19° for material that was stored, which means that no significant decrease in degree of hydrophilicity after storage for five weeks.

Finally, the sample 2d relates to polypropylene fibers from the treated in a corona discharge of non-woven material, which is washed and then stored for five weeks. The degree of hydrophilicity of the sample 2d almost constant when compared with the data not subjected to storage and lepromatosa sample 2A, which means that the silicon-containing polar group is stably associated with the surface of the fibrous material.

Example 3 - determining the time of penetration of the liquid to the sheet of material

To determine the time of penetration of the liquid to the fibrous structure was used EDANA test method. 14-20-06 W25. This method measures the time required for a predetermined amount of fluid has passed through the top sheet of non-woven material, with non-woven material is in contact with the sample absorbent material located under a non-woven material.

Typical absorbent material consists of 5 layers of filter paper ERT FF3 100

Was measured in 5.0 ml of fluid for testing and poured it into a container for liquid on the measuring device, and then began the process of measurement. The measuring device designed to measure the time of penetration, has the same mark as the plate for bleeding through.

The measurement was carried out on the non-woven material consisting of polypropylene and having a specific weight of 18 g/m2. Fluid for testing consisted of 0.9% NaCl solution.

The samples from example 3

1. Untreated polypropylene non-woven material.

2A. Polype silicon-containing polar groups at the surface of the material,

2b. after washing treated in a corona discharge nonwoven material under item 2A.

Below are the parameters characterizing the operating conditions under which have been processed samples 2A and 2b:

The feed rate of non-woven material - 26 m/min.

Width of non-woven material - 0.65 m

Electric power corona discharge - 1690 W

Consumption of N2- 94 l/min

Consumption of N2O - 0,39 l/min

Consumption of SiH4- 0,115 l/min

On the first operation non-woven fabric was subjected to processing in the corona discharge in air, and in the second operation, the material was subjected to processing in the corona discharge with the introduction described above in this application of the gaseous mixture.

The material was washed by placing it in a container with distilled water. The temperature of the distilled water is 37°C. the Material was left in the water for 15 seconds and then removed from the water and spread out evenly to dry.

The results for example 3

Sample Time (seconds)

1 >300

2A 2,7

2b 2,9

The results show that the raw non-woven material 1 has a penetration time that exceeds 300 seconds, which means that the liquid does not penetrate the non-woven material during the measurement period, which is but the invention with the purpose of introducing silicon-containing polar groups at the surface of the material, has the time of penetration, which is 2.9 seconds, and almost equal to the time of penetration for lepromatosa treated in a corona discharge of non-woven material.

You should not consider the invention as limited options for implementation that have been described in this application. Accordingly, within the scope of the applied claims, there are many additional variations and modifications.

Therefore, although the invention and its advantages have been described in detail and illustrated for the case of non-woven fibrous structures that are used for baby diaper, as it is obvious for the person skilled in the art, the invention has a much broader scope, including, for example, woven fibrous structures made of natural or synthetic fibers.

In addition to the field of hygienic products within the scope of the invention can be considered in many other fields of application, in each case, the properties that are desirable and can be achieved according to the invention (hydrophilicity, adhesive properties, the properties obtained by treating, preventing pollution,...), may be different.

At the beginning of the present description, when iberoame product containing one or more fibrous structures in which at least a portion of the surface of at least one of these fibrous structures associated at least with one or more kinds of silicon-containing polar compounds, characterized in that the fibrous structure is thus predetermined degree of hydrophilicity, which essentially does not influence the wetting patterns, and/or has adhesive properties that are essentially not affected by the wetting patterns, and the fibrous structure was subjected to an 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.

2. The absorbent product according to p. 1, wherein the silicon-containing compound mainly formed from the connection 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.

3. The absorbent product under item 1 or 2, characterized in that at least one of these fibrous different topics that at least one of the fibrous structures contains one or more nonwoven materials.

5. The absorbent product according to any one of paragraphs.1-4, characterized in that the fibrous structure associated with the silicon-containing compound, was subjected to electric 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.

6. The absorbent product according to any one of paragraphs.1-4, characterized in that the fibrous structure associated with the silicon-containing compound, was subjected to treatment by exposure to 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.

7. The absorbent product under item 5 or 6, characterized in that the fibrous structure associated with the silicon-containing compound, prior to its exposure to the impact of the specified electric discharge in the presence of a specified gas mixture, or prior exposure to it which operation to effect corona discharge in the air.

8. Absorbent product, it is a diaper, a sanitary pad, a protective device which is used in case of incontinence, characterized in that it contains an absorbent body (105) concluded between the non-permeable to fluid covering sheet (103) and permeable to fluid covering sheet (101), and the fact that the absorbent product contains one or more of these fibrous structures PP.1-7, associated with the silicon-containing compound.

9. The absorbent product according to p. 8, characterized in that the permeable for liquids covering sheet (101) contains one or more of these fibrous structures associated with the silicon-containing compound.

10. The absorbent product under item 8 or 9, characterized in that between the permeable for liquids covering sheet (101) and an absorbent body (105) is providing transfer fluid layer (108) containing one or more of these fibrous structures associated with the silicon-containing compound.

11. The absorbent product according to p. 10, characterized in that the permeable for liquids covering sheet (101) indicated providing transfer fluid layer (108) and the specified absorbent body (105) have distinguished the sustained transfer fluid layer (108) contains a set of several of these fibrous structures, associated with the silicon-containing compound, and the fact that the above set of fibrous structures has a gradient degrees of hydrophilicity.

13. The absorbent product according to any one of paragraphs.8-12, characterized in that it is a hygiene product, such as the product to dry, the dressing on the wound, and contains one or more of these fibrous structures associated with the silicon-containing compound.

14. The absorbent product according to p. 13, characterized in that it comprises a set of several of these fibrous structures associated with the organosilicon compound, and the fact that the above set of fibrous structures has a gradient degrees of hydrophilicity.

 

Same patents:

The invention relates to a method and apparatus for forming vozduhoohladiteli absorbent core, and the proposed device comprises a first source for supplying fibrous material is carried away by the air stream, and the first vozduhoohladiteli means connected to the first source for supplying fibrous material, carry out air flow, and has performed with the possibility of movement of the first perforated molding element intended for the formation of the first vozduhoudalenija component absorbent core

The invention relates to medicine

The invention relates to medicine

The invention relates to the structure of the material in an absorbent product for personal hygiene, such as diapers, training pants, absorbent underwear, hygiene items for adults suffering from incontinence, bandages and feminine hygiene products

The invention relates to medicine and relates to a tampon for feminine hygiene, or for use in medicine, including non-woven coating having at least one facing outwards smooth surface, and essentially comprising an absorbent liquid core, and non-woven coating contains at least partially thermoplastic, hot melt fiber and pressed into final form of the tampon

The invention relates to medicine, specifically to hygienic absorbent product having wings, which essentially continuously diverge from their nearest edges on a large part of their length, preferably up to their peripheral edges

The invention relates to a method and apparatus for forming vozduhoohladiteli absorbent core, and the proposed device comprises a first source for supplying fibrous material is carried away by the air stream, and the first vozduhoohladiteli means connected to the first source for supplying fibrous material, carry out air flow, and has performed with the possibility of movement of the first perforated molding element intended for the formation of the first vozduhoudalenija component absorbent core

Sanitary pad // 2222302

The invention relates to medicine

The invention relates to a film made of the volume of perforated plastic material, and the corresponding matrix for its production

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

Up!