JP6937814B2 - Absorbent products containing non-woven materials - Google Patents

Description

An absorbent product that includes a non-woven material that is arranged to contact the user's skin during use of the absorbent product, the non-woven material comprising non-absorbable fibers and / or absorbent fibers.

Users of absorbent hygiene products, such as diapers, sanitary products, or incontinence protective clothing, may experience skin problems. Skin problems can be caused by forces resulting from physical / mechanical interactions between the product and the user's skin. Thus, for example, abrasions are caused by excessive friction between the absorbent product and the user's skin. There are several studies improving the softness of absorbent products, and in particular the softness of non-woven materials used on surfaces that come into contact with the skin, such as topsheets of absorbent products. Today's absorbent products are focused primarily on providing products with a high degree of comfort by using non-woven materials that provide a soft feel to the skin, which is prior art. Is also disclosed.

For example, WO 2008/147264 relates to a non-woven material for use as a body-facing sheet in an absorbent article, wherein the non-woven material comprises at least two layers and the article. The layer oriented to contact the user during use contains staple fibers with a roughness of less than 1.5 dtex. This part of the sheet feels soft to the user. It has been explained that a soft feel can also be achieved using fibers / filaments such as cotton, viscose, lyocell, etc., which have high softness and textile comfort. However, these fibers / filaments bind to the liquid, leaving a wet surface in contact with the skin, which is not advantageous.

U.S. Patent Application Publication No. 2006/0121811 relates to absorbent products, where the surface in physical contact with the user's skin contains fine fibers, producing a material that is soft to the skin. Also, WO 2007/114742 relates to non-woven topsheet materials containing microfibers that come into contact with the skin to improve softness to the skin.

International Publication No. 2008/147264 U.S. Patent Application Publication No. 2006/0121811 International Publication No. 2007/114742

An object of the present invention is to provide an absorbent product comprising a non-woven fabric material that is arranged to contact the user's skin, the non-woven fabric material during use of the absorbent product is between the non-woven fabric and the skin. Reduces the risk of mechanical discomfort due to friction.

Fine fibers with low roughness, as described in the prior art as being useful to be closest to the skin to improve softness, are not necessarily absorbent in the presence of small amounts of moisture. We have found that it is not appropriate to be closest to the skin of the user of the product. Fine fibers with low roughness are soft in dry conditions, but in the presence of moisture / liquid, fine fibers also have a disadvantage.

The friction that occurs between the non-woven material and the user's skin is different in the presence of liquid / moisture than in the absence of liquid / moisture. The presence of very small amounts of moisture from sweat, sweat, or other body fluids also affects the frictional forces created between the non-woven material and the user's skin. Therefore, it has been found that careful selection of the non-woven fabric properties is very important so that the non-woven fabric can minimize mechanical discomfort during the overall use of the product.

One main reason for mechanical discomfort is related to "stickiness", that is, it acts between the absorbent product and human skin in the presence of moisture (sweat, sweat, urine). It is recognized that it is related to the power to do. Therefore, it is an object of the present invention to provide an absorbent product having these forces and a non-woven material that minimizes their negative effects on the skin.

The non-woven material is used on all parts of the absorbent product that come into contact with the skin, for example, on the topsheet of the absorbent article, or in the case of diapers, the waist area, hip area, standing gathers, leg openings, and belts. It is possible to be on top of. Absorbent products provide low friction between the user's skin and the product, which is due to the presence of sweat and sweat, or other bodily fluids, as well as when the area is substantially dry. And so when the area is damp, both times. This purpose is achieved by an absorbent product characterized by the features defined in the appended claims. This object is also achieved by the use of absorbent articles, characterized by the features defined in the appended claims.

The present invention relates to absorbent products, including non-woven materials that are arranged to contact the user's skin during use of the absorbent product. The non-woven material includes non-absorbent fibers and / or absorbent fibers, at least the fibers on the surface that are arranged to contact the user's skin during the use of the absorbent product, 0.1 dtex to 10 dtex. It has a roughness of 0.5dtex to 7dtex, or a roughness of 0.5dtex to 3dtex. Fiber and / or non-woven materials are used in absorbent and / or hygienic products, at least on surfaces that are placed in contact with the user's skin during use of the absorbent product. It is coated with the appropriate lubricating coating ingredients.

Also, the non-woven material can include absorbent fibers. Absorbent fibers can have a roughness of 1dtex to 10dtex, or 1.1dtex to 7dtex, or 1.2dtex to 3dtex.

When using absorbent articles, friction occurs between the skin and the surface of the absorbent articles, for example between the skin and the non-woven material. The friction between the non-woven material and the skin in the presence of moisture / liquid is complex, and even very small amounts of moisture have a negative effect on the measured friction. The amount of moisture is small and the non-woven fabric may feel dry when touched. In this case, moisture may only be present between the fibers and the skin, and the interaction of each fiber with the skin due to moisture is called wet contact. Wet contact is caused by the construction of a meniscus between the skin and the fibers of the non-woven fabric that are in wet contact with the skin.

As mentioned above, one reason for mechanical discomfort is related to stickiness, i.e. absorbent products and humans in the presence of small amounts of moisture, such as sweat, sweat, and urine. It is related to the force acting on the skin. Materials that minimize these forces and their negative effects on the skin by understanding the relationship between the discomfort-causing adhesive force and the properties of the non-woven materials used in the absorbent product. Can be generated. Adhesion can be described as a normal force acting between the solid material and the supporting surface in the presence of a small amount of moisture. An example of stickiness is a shower curtain that can easily adhere to the skin in the presence of a small amount of moisture.

In order to be able to reduce friction in areas where the non-woven fabric is in contact with the wearer's skin, the non-woven fabric material needs to be designed to at least reduce wet friction. Wet friction is experienced between wet or damp products and the skin. Wet rubbing can also occur in low concentrations of moisture or liquid that are present in the product or within the boundary between the non-woven fabric and the skin. Dry rubbing is experienced between the dry product and the skin. Measuring methods for determining wet and dry friction will be described in more detail below.

At a minimum, on surfaces that are placed in contact with the user's skin during use of the absorbent product, the non-woven fabric with a lubricating coating component suitable for use in absorbent and / or hygienic products. By coating, as well as having non-absorbent fibers and / or absorbent fibers in a non-woven fabric having a roughness of 0.1 dtex to 10 dtex, a roughness of 0.5 dtex to 7 dtex, or a roughness of 0.5 dtex to 3 dtex. By doing so, the absorbent product exhibits a reduction in wet friction between the absorbent product and the user's skin.

The reduction is achieved by the fact that the lubricating coating component increases the contact angle, thereby reducing the meniscus and wet friction between the skin and the non-woven fabric.

Wet contact is the contact between the fibers of the non-woven fabric and the skin, where moisture is present only at the contact points and not in the pores of the non-woven fabric. Coarse fiber materials have fewer points of contact with the skin than materials made from finer fibers. The combination of reducing the number of wet contacts and applying a moisture lubrication coating contributes to reducing the wet friction between the user's skin and the non-woven fabric.

The lubricating coating component can be selected from silicone oils, one preferred example of which is polydimethylsiloxane. These lubricating components are non-toxic and provide very good lubricating properties for absorbent products.

The lubricating coating component can be coated in an amount of 10 ppm to 10% by weight based on the total weight of the non-woven fabric.

The coating can be applied by printing or kiss rolling, and the coating can be applied to 20-100% of the total surface area.

The lubricating coating component on the non-woven material can have a moisture content of less than 5.0 weight percent, less than 3.0 weight percent, less than 2 weight percent, less than 1.0 weight percent, or less than 0.5 weight percent. .. Low water content reduces the risk of bacterial growth. To obtain the desired low water content, the coated non-woven material can be dried after the coating has been applied to the non-woven material.

The non-woven fabric material can include spunbonded non-woven fabric, air-laid non-woven fabric, wet non-woven fabric, non-woven fabric by carding, non-woven fabric by electrospinning method, melt-blown non-woven fabric, or any combination thereof. The non-woven material can be a laminate or combination of several types of non-woven material. The non-woven material can include a combination of spunbonded non-woven fabrics and melt-blown non-woven fabrics, either spunbond-meltblown-spunbond (SMS) layered products or spunbond-meltblown-meltblown-spunbond (SMMS) layered products. It is possible to form a product.

The non-woven fabric can have ^{a basis weight of 8 g / m 2} to 80 g / m ^2, a basis weight of 8 g / m ² to 40 g / m ² , or a basis weight of 8 g / m ² to 30 g / m ^2. .. Therefore, a non-woven fabric material having a sufficient basis weight to resist the force generated by friction is provided.

The non-woven fabric can contain a mixture of non-absorbent fibers and absorbent fibers. Absorbent fibers are present in an amount of 2-30% by weight, preferably about 2-10% by weight, based on the total weight of the fibers of the non-woven material. Absorbent fibers can have a roughness of 1dtex to 10dtex, or 1.1dtex to 7dtex, or 1.2dtex to 3dtex.

Absorbent fibers are preferably based on cellulose containing regenerated cellulose fibers such as non-toxic viscose fibers and / or lyocell fibers. Non-absorbent fibers can include synthetic fibers such as polyolefin-based fibers such as polypropylene (PP) or polyethylene (PE) fibers. The synthetic fiber can be of any commercially available type and can be obtained, for example, by extrusion molding.

The absorbent product can be a hygienic product with skin contact, such as a diaper, incontinence protective clothing, a sanitary napkin, or a panty shield. Also, the absorbent product can be of another type of absorbent product in which the non-woven fabric is arranged so that it is in contact with the user's skin.

Absorbent products can include a chassis with front and rear panels and an absorbent body with a wetting zone to receive urine and other bodily fluids. The non-woven material is configured in at least one area outside the wetting zone within the body of the absorbent to receive urine and other body fluids. The non-woven material is instead configured in the outer region of the absorbent body. For example, in the case of diapers, the wetting zone and / or the absorbent body is not always in direct contact with the skin. The reason is that these areas are distanced from the user by "cup shapes" and / or standing gathers.

Absorbent products can include waist areas, hip areas, standing gathers, leg openings, and belts. The non-woven material is composed of at least one of a waist area, a hip area, standing gathers, leg openings, and a belt. These areas can contain moisture, for example sweat / sweat, and friction between the non-woven material and the user's skin occurs with an increased risk of abrasion. This risk can be reduced by the use of non-woven materials in these areas.

The belt can be attached to the chassis, or the belt can be arranged so that it can be attached to the chassis, although it is separated from the chassis. The non-woven fabric may at least consist of a belt on the side of the belt that is placed in contact with the skin. Therefore, the risk of abrasion and skin problems can be reduced in the belt area.

The absorbent product can include a top sheet, an absorbent body and a back sheet, and the non-woven material is in the top sheet and / or back sheet of the absorbent product (eg, in contact with the skin). It is constructed (around the leg opening in the backseat). Thus, the risk associated with skin problems can be reduced in large areas of absorbent products in contact with the skin.

Nonwoven materials such as those described above are preferably in the presence of moisture, and / or better than non-woven materials containing uncoated non-wovens with lubricating coating components, and /. Alternatively, it should have a lower friction value than a non-woven material containing fibers with a roughness finer than 0.1 dtex on a surface that is placed in contact with the user's skin during use of the absorbent product. It is possible. These friction values are measured according to a repetitive stick-and-slip method that will be described in more detail below. A curve with measurements of friction values is obtained using this method in repeated runs. The curve includes a plateau with a positive coefficient indicating an increase in friction value and a second slope having a negative coefficient indicating a decrease in friction value. In the plateau, the friction value is substantially constant over the spread of the plateau. Small changes in the plateau and small changes along the slope are possible between the individual values, but the positive coefficient is that every individual value in the first slope has a positive coefficient. It means that they are generated together, all the individual values in the second slope are generating negative coefficients together, and all the individual values in the plateau are plateaus. Are generated together. The lower the friction value, the more skin-friendly the absorbent product can be and the skin problems that accompany the use of the absorbent product can be reduced.

The present invention also relates to absorbent products, including non-woven materials that are arranged to contact the user's skin during use of the absorbent product. Nonwoven materials are more user-in the presence of moisture than non-woven materials containing fibers and / or than non-woven materials containing uncoated non-wovens with lubricating coating components and / or during the use of absorbent products. Has a lower friction value than non-woven fabrics containing fibers with a roughness finer than 0.1 dtex on a surface that is placed in contact with the skin. Friction is measured according to a repetitive stick-and-slip method. A curve with measured friction values is obtained in repeated runs using this method. The curve includes a plateau with a positive coefficient indicating an increase in friction value and a second slope having a negative coefficient indicating a decrease in friction value. The lower the friction value, the more skin-friendly the absorbent product can be and the less skin problems that occur with the use of the absorbent product.

The present invention further relates to absorbent products, including non-woven materials that are arranged to contact the user's skin during use of the absorbent product. Nonwoven materials are more user-in the presence of moisture than non-woven materials containing fibers and / or than non-woven materials containing uncoated non-wovens with lubricating coating components and / or during the use of absorbent products. Has a lower maximum friction value than non-woven materials containing fibers with a roughness finer than 0.1 dtex on surfaces that are placed in contact with the skin, it is a repetitive stick and slip. Measured along the curve obtained in a repeated run by the measurement by the method. The friction value is obtained in repeated runs, the friction value obtained during the run forms a curve, and the curve is with a plateau with a first slope having a positive coefficient indicating an increase in the friction value. Includes a second slope with a negative coefficient indicating a decrease in friction value. The friction values obtained during the run form a curve, which is the friction with the first slope, which has a positive coefficient indicating an increase in friction value, and the plateau, which exhibits essentially unchanged friction. Includes a second slope with a negative coefficient indicating a decrease in value. The lower the friction value, the more skin-friendly the absorbent product can be and the less skin problems that occur with the use of the absorbent product.

The present invention further relates to the use of the non-woven material in an absorbent or hygienic product to reduce wet friction between the non-woven material and the user's skin. Nonwoven materials include non-absorbent fibers and / or absorbent fibers, which have a roughness of 0.1 dtex to 10 dtex, a roughness of 0.5 dtex to 7 dtex, or a roughness of 0.5 dtex to 3 dtex. .. Fiber and / or non-woven materials are used in absorbent and / or hygienic products, at least on surfaces that are placed in contact with the user's skin during use of the absorbent product. It is coated with the appropriate lubricating coating ingredients. Surprisingly, it is noted that this type of non-woven material with a lower friction value can make the absorbent product more skin-friendly and also reduce the skin problems that arise with the use of the absorbent product. .. Wet friction is measured between the surface of the non-woven fabric and the user's skin of the absorbent product by the repetitive stick-and-slip method described herein. Nonwoven materials can be used in absorbent products selected from diapers, incontinence garments, sanitary napkins, or panty shields. Nonwoven materials are used in the substantially non-absorbent region of absorbent products.

Here, further objects and advantages of the present invention will be described with reference to the drawings and detailed description below.

It is a figure which shows roughly the influence of the presence of moisture on the fiber in a nonwoven fabric when the nonwoven fabric is damp. A diagram schematically showing friction measurements obtained using a non-woven fabric with a lubricating coating component on fibers in a non-woven fabric and a non-woven fabric without a lubricating coating component using a repetitive stick-and-slip method. Is. It is a figure which shows the principle sketch of the contribution of different forces. It is a figure which shows schematic the instrument structure concerning the stick-and-slip measurement method. It is a figure which shows the measurement data obtained by the repetitive stick-and-slip method for a plurality of non-woven fabric materials including a fiber with a lubricating coating component and a fiber without a lubricating coating component. It is a figure which shows typically the absorbable article in the form of a panty liner containing a non-woven material. FIG. 5 is a diagram schematically showing an absorbent article in the form of a sanitary napkin containing a non-woven fabric material. It is a figure which shows typically the absorbable article in the form of a diaper containing a non-woven fabric material. It is a figure which shows typically the absorbable article in the form of a pants type diaper containing a non-woven fabric material. It is a figure which shows typically the absorbent article in the form of a belt type diaper containing a non-woven fabric material.

By "absorbable product" is meant a product that is adapted to absorb bodily fluids such as urine or blood, or to absorb bodily fluids such as urine or blood. Absorbent products are wearable by the user and are to be worn by the user, such as diapers, pants-type diapers, sanitary napkins, panty liners, or incontinence products, by "wearable absorbent products". It means an absorbent article that becomes.

By "absorbent fiber", it means a fiber that has the ability to absorb a liquid, such as about 1 g liquid / 1 g fiber. In addition, the fiber has a moisture-mitigating ability and is defined as hygroscopic.

By "non-absorbable fiber", it means a fiber that is virtually incapable of absorbing.

The non-woven material layer or web of the present invention can be advantageously selected from, for example, spunbonded non-woven fabrics, air-laid non-woven fabrics, wet non-woven fabrics, carded non-woven fabrics, electrospinning non-woven fabrics, or melt-blown non-woven fabrics. Nonwoven materials can be bonded by multiple techniques, for example, by needling, hydroentangling, or thermal bonding.

The non-woven material of the disclosed product can be a mixture of natural and synthetic materials, or can consist solely of synthetic or natural fibers. Natural fibers are, for example, cellulose fibers or fibers from regenerated cellulose. Synthetic fibers are, for example, polyolefin-based fibers such as polyester fibers, polypropylene fibers or polyethylene fibers, and / or combinations thereof.

Nonwoven materials are a combination of several types of nonwoven materials, such as spunbond-meltblown, spunbond-meltblown-spunbond (SMS) type, or spunbond-meltblown-meltblown-spunbond (SMMS) type. It is possible that In cases where several layers of non-woven fabric are laminated by gluing or ultrasonic waves, the non-woven fabric layer in contact with the skin is the only non-woven fabric material referred to in this description.

The basis weight for the non-woven fabric layer can be varied ^{from 8 g / m 2} to 80 g / m ² , preferably from 8 g / m ² to 30 g / m ² , and more preferably ^{from 8 g / m 2} to 20 g / m ^2. .. When the basis weight is ^{less than 40 g / m 2} , it is possible to obtain sufficient breathability, drape and comfort for the product. Basis weights of 8 g / m ² to 20 g / m ² have been found to provide the best comfort and flexibility while the material remains workable.

By "lubrication" or "lubricant" means a substance or component that serves to lubricate and thus make the surface on which the component is applied slippery.

The various non-woven material layers of the elastic laminate can be of the same material or different materials, and can have the same basis weight, the same basis weight, or different basis weights. If different materials are selected, elastic webs with different surface properties can be obtained across the web. For example, layers can have different frictional properties or different liquid / vapor penetration properties.

The lubricating coating component of the present invention can be of the type silicone oil, i.e., a polymerized siloxane, preferably polydimethylsiloxane, also referred to as dimethicone. The water content of the lubricating coating component can be less than 5.0 weight percent, less than 3.0 weight percent, less than 2 weight percent, less than 1.0 weight percent, or less than 0.5 weight percent. The lubricating component can be applied to the fiber / non-woven material in the form of a solution, which is then dried to reduce the water content to less than 5.0 weight percent. FIG. 1 schematically illustrates the effect of the presence of moisture on the fibers in the non-woven fabric when the non-woven fabric is damp.

FIG. 1 schematically shows an enlarged view of one fiber 2 in the non-woven fabric material 1 in the presence of moisture. Moisture causes the meniscus 3 to form between the fibers and the skin 4 and increases the wet friction between the non-woven fabric 1 and the skin 4. The meniscus 3 forms a strong interaction between the non-woven fabric 1 and the skin 4, i.e., a relatively strong force is required to destroy each meniscus 3. This is the effect of the capillary force of the liquid around the surface contact area (the surface contact area is the area of the fiber in contact with the liquid and the area of the skin 4 in contact with the liquid). , Has a significant effect on the strength of the adhesive joint and is capable of forming the meniscus 3. The lubricating coating component is the fiber when the fiber is coated with the lubricating coating component, at least on a surface that is placed in contact with the user's skin during the use of the absorbent product. That the wettability of 2 is reduced, the capillary force is reduced, the interaction is weakened as a result, and a lower force is required to destroy each meniscus 3. As a result. The lower force required to destroy the meniscus leads to a reduction in wet friction.

FIG. 2 schematically shows friction measurements obtained using a non-woven fabric with a lubricating coating component and a non-woven fabric without a lubricating coating component using a repetitive stick-and-slip method. FIG. 2 contains two curves, the first curve 6 illustrates the friction value of the non-woven fabric containing only non-absorbent fibers, and the second curve 7 shows the friction of the non-woven fabric containing coated fibers. The values are illustrated. The friction values of curves 6 and 7 are plotted in a graph in which the number of friction runs is taken on the x-axis and the frictional force is taken on the y-axis with gmf. By gmf, it means gram weight, and 1 gram weight is 9.80665mN.

Stick-and-slip measuring method for measuring wet friction In this method, the static friction between the material and human skin, the sns value (stick-and-slip value), is measured by gram weight gmf. This method means that the same material strips are used and the runs are repeated. First, sns values for dry conditions (dry material and skin) are measured, followed by different liquid levels (from completely wet material to moist material and to almost dry material). The wet condition is measured and the sns value returns to the level of skin-material interaction measured in the first dry run, which means that the material is dry again. Therefore, the method is referred to as a repetitive stick-and-slip method, or sns run-dry-wet dry.

--Definition of this method The stick-and-slip value is defined as the point on the force curve (gmf) where the material begins to move smoothly over the arm. The sns values from all single force curves are then placed together in a new graph, representing the sns values as a function of the number of runs.

--Principles of the method As illustrated in Figure 4a, a strip 110 of test material is pulled across the forearm 100 on the palm side with the help of the MTT170 tensile tester 120, between the material and the skin. Measure the static friction of. First, a dry strip is pulled across the forearm on the palm side. The strips are then repeatedly pulled across the palm-side forearm until completely wet and dry again. Systems with dry skin / dry material, dry skin / wet material, occluded skin / dry material, and closed skin / wet material can be tested. Dry skin / wet material is the only measurement made herein, but during a wet run, the skin is affected to some extent by the liquid in the system, It may be somewhat closed before eventually reaching the level for dry sns values again.

-Method equipment-Arm of the person being tested, forearm on the palm side-The person being tested is acclimatized in a climatic room at 21 ° C and 45% rh for 15 minutes.
The test will be conducted in a climate room at 21 ° C and 45% rh.
-DiaStron MTT170 Tensile Tester-Adjustable armrest channel-Software MTT Win (UvWin1.32.000)
・ Clamp 1: Above the tensile tester ・ Clamp 2: Counterweight, 60g
-0.9 wt% NaCl solution (150 ml / material strip)
・ Punching, 30 * 350mm

--Material The material to be tested is punched or made into rectangular strips measuring 30 x 350 mm. When testing, the treated side, i.e. the side of the non-woven fabric with the claimed properties, is placed facing the skin.

--Wet the material strip
The material strip is completely wetted by submerging the entire strip in a beaker of 0.9 wt% NaCl solution (150 ml) for 1 minute. The strips are lifted using a pair of tweezers at the edges that will be placed inside the clamps of the tensile tester. The clamp of the tensile tester is illustrated in FIG. 4a, using reference numeral 114. The strip is pulled up slowly in contact with the edge of the beaker, which allows the material to drain its excess liquid. It represents a completely wet non-woven fabric and represents 100% saturation. At the other edge of the strip, a 60g counterweight is installed. The counterweight is illustrated in FIG. 4a with reference number 112.

A sns run with wet strips is then tested in the same manner as the first run.

--Start procedure The computer and control unit are switched on, the instruments and programs are initialized, and the mode is ready to start.

The delay time is 12 seconds per friction measurement, giving time to set the load to zero and to put the material strip in the correct position on the arm before the run begins.

If the material strip does not reach its slip value after 50 mm, the distance needs to be increased.

-Positioning the arm of the person being tested The person being tested should stand close to the device with the arm comfortably supported in the armrest channel. The armrest channel is adjusted so that the upper part of the forearm on the palm side is at the same level as the clamp on the tensile tester. This means that the material strip is horizontal between the clamp and the arm. During the measurement, the arm should be kept quiet and relaxed.

--A dry non-woven strip to be tested is placed in a clamp on the tensile tester and a 60g counterweight is fastened in the other edge of the strip.

The person's arm to be tested should be properly placed within the armrest channel as described in "Positioning the person's arm to be tested".

The test is started. The first second of the delay time is used to set the reading to zero, lift the non-woven strip from the arm and hold the counterweight so that no tensile force is present on the tensile tester. The non-woven strip should then be hung on the relaxed arm and the counterweight should be stationary. The sns run starts as soon as the 12 second delay ends.

The load cell travels a preset distance (50 mm) at a specific speed (150 mm / min), pulls the non-woven strip on the arm, and when it stops, the sns value is recorded. The so-called sns value, which is where the material no longer "sticks" to the skin and begins to move smoothly, is recorded for every iteration.

Return the tensile tester to the starting position.

The same non-woven strip is then submerged in a bathtub of 0.9% NaCl solution for 1 minute. See instructions for "wetting material strips". The wet non-woven strip is then accurately attached to the clamp on the tensile tester, with the counterweight at the edge and the arms in the same position, similar to the first run. The friction measurement is started in the same way as the first run, and the sns value is recorded from the friction curve for the second run.

The non-woven strip is then lifted away from the arm without touching anything while the tensile tester returns to its starting position. Returning to the start position, the next run will be started as soon as possible in the same way as the first run, and the third sns value will be recorded. The test continues in this way until the sns value is at the same level as the first run.

--Calculation and representation of results The sns value from each run is recorded (gmf), a graph showing the repeated sns value (gmf) is created, and the sns value is represented as a function of the number of runs.

Returning to the non-woven material, the non-woven material having a lubricating coating component and fibers having a roughness of 0.1 to 10 dtex is schematically represented in FIG. 2 by the second curve 7 and also the first curve. It has a relatively lower friction value than a non-woven material composed of uncoated fibers with a roughness finer than 0.1 dtex represented by 6. Friction values for both materials are measured for the same tested person according to a repetitive stick-and-slip method. Curves 6 and 7 have measurements of friction values obtained in repeated runs using the method. Curves 6 and 7 show a first slope 6a, 7a with a positive coefficient indicating an increase in friction value, a plateau 6b, 7b, and a second slope 6c with a negative coefficient indicating a decrease in friction value. , 7c and so on. In the plateau, the friction values are essentially the same and small changes are possible.

The curve starts at a value corresponding to the dry friction measured for the dry non-woven fabric. The positive coefficients of the first slopes 6a, 7a indicate an increase in friction when the dry non-woven fabric gets wet and wet friction occurs. The second slopes 6c, 7c illustrate the interface between the skin and the non-woven fabric, which returns the friction curve to the value of dry friction. As can be seen from FIG. 2, the non-woven fabric material according to the invention has lower wet friction over the entire range of runs.

For some materials, very clear peaks can be seen in the friction value curve. These peaks are caused by stickiness, as indicated by reference numerals 6d and 7d in FIG. 2, which occur only in the presence of small amounts of moisture. The mechanical and adhesive properties of many substances are very sensitive to the presence of moisture. This is the effect of the liquid capillaries around the surface contact site, which has a significant effect on the strength of the adhesive joint and is capable of forming a meniscus. This is the adhesive effect and adhesive strength. This tackiness value can be reduced by the non-woven fabrics according to the invention, as the stickiness is believed to be primarily caused by the forces acting on the material and skin by the meniscus.

Figure 3a shows a principle sketch of the contribution of different forces and shows the case where they are assumed to work in the range of wet drying. From the left side, the force exerted between F_dry, the dry non-woven material containing the dry skin 30, fiber 32, and F_wet points contacts, the fiber 32 of the material in the presence of a small amount of moisture 34. The force exerted between the skin 30 and the F_wet pores, i.e. the force exerted between the skin 30 and the wet material containing the fiber 32 and the large amount of moisture 34 illustrated by the shaded area. be. In the last case, there is more moisture than when F_wet points contacts are applied. It can be seen that the higher moisture 34 present in the pores causes a thin film to form on the skin.

The total frictional force in a system containing moisture is the sum of the drying force (F_dry) and the adhesive force (F_clinging).
F_friction = F_dry + F_clinging (Equation 1)

Usually F_dry << F_clinging. Adhesive strength can be further divided into contributions arising from wet contact and wet pores.
F_clinging = F_wet contacts + F_wet pores (Equation 2)

In reality, the frictional force is a mixture of all three interactions that occur in different numbers as described by Equation 3.
F_friction (s) = F_dry × C_dry + F_wet contacts × C_wet contacts (s) + F_wet pores × C_wet pores (s) (expression 3)
Where s is the degree of saturation at the interface and C is the occurrence of the interaction.

When the material is wet, the force from the wet pores provides a great contribution to wet friction. The force of the wet pores rapidly increases the friction, as seen by the positive coefficients of the first slopes 6a, 7a of the curve as shown in FIG. The material dries slowly over the next run. Over these runs, the forces from the wet pores still provide the greatest contribution to frictional forces. This is indicated by plateaus 6b, 7b. As the material dries further, the force from wet contact, the meniscus described above, provides a sharp increase in frictional force, as indicated by the sharp increase in friction at peaks 6d, 7d. After reaching peaks 6d, 7d, the material dries further, reducing the number of wet contacts. This quickly returns the curve to the dry friction value. This is seen by the negative coefficients of the second slopes 6c, 7c. If the peak is reached between the two measurements, the peak may not be shown in the measurements.

Figure 4b shows the standard non-woven material without lubricating coating; the same non-woven material as the standard, but with different amounts (ie 400ppm and 0.4%, respectively) of lubricating coating component Dimethicone (PMX-200 Silicone Fluid 1.5 from Dow Corning Corporation). Obtained by a repeatable stick-and-slip method for two non-woven materials with CS); as well as a non-lubricating coated Intelligent fabrics technology coating "Dreamskin" for non-woven materials containing skin (also the same non-woven material as the standard). The measurement data obtained is shown. Looking at FIG. 4, overall high friction values were obtained for the non-woven fabric without the lubricating coating component (reference curve), while lower friction values were obtained for the non-woven fabric with the lubricating coating component (curve 0.4% Dimethicone and). Obtained for a curve of 400 ppm Dimethicone). The non-lubricating component "Dreamskin" was given a friction value for the non-woven fabric, which was even higher than the uncoated standard. This illustrates the effect of applying a lubricating coating component to the fiber, at least on a surface that is placed in contact with the user's skin during the use of absorbent material, to reduce wet friction. There is. As explained in connection with Figure 2, plateau levels can usually be seen to be followed by a sudden increase in friction (“adhesive peak”) before the frictional force begins to fall again. .. A table with measurements for the curves in Figure 4b can be found in Appendix 1 attached at the end of the detailed description.

Absorbent products in which a non-woven material is used generally include a chassis and an absorbent structure within the chassis. The chassis includes a front panel and a rear panel. The front panel is intended to cover the wearer's abdominal area and the rear panel is intended to cover the lower back and buttock areas. The absorbent product also has an inseam area that extends between the front and rear panels. The inseam region can be made from an absorbent structure or can be made from the chassis of the product. Typically, the absorbent structure further comprises an absorbent body, which is located primarily in the crotch area, but also extends into the front and back panels of the chassis. The absorbent body is sandwiched between a liquid permeable top sheet and generally a liquid permeable back sheet. Also, the outer cover of the chassis can be a liquid impermeable backsheet of the absorbent structure.

The absorbent body is expelled from the body, such as cellulose flap pulp, tissue layers, highly absorbent polymers (superabsorbents), absorbent foam materials including hydrogel-foam materials, or absorbent non-woven materials. It is possible to include any conventional material suitable for absorbing waste products.

Generally, the liquid permeable topsheet contains or is composed of a non-woven material. The topsheet material may be further composed of tow fiber, porous foam, perforated plastic film and the like. As mentioned above, a material suitable as a topsheet material should be soft and non-irritating to the skin, and is easily penetrated by body fluids such as urine or menstrual fluid and is low. Shows rewetting characteristics.

The liquid impervious backsheet is, for example, a polyethylene film or polypropylene film, a non-woven material coated with a liquid impermeable material, a hydrophobic non-woven material that resists liquid permeation, or a laminate of plastic film and non-woven material. Etc., can be composed of a thin plastic film. The backsheet material can be breathable, allowing vapors to escape from the absorbent body while still preventing liquids from passing through the backsheet material.

The topsheet and backsheet can be connected to each other, for example by adhesive bonding, gluing, or thermal or ultrasonic welding. The topsheet and / or backsheet can also be attached to the absorbent body by any method known in the art, such as adhesives, thermal bonding, and the like.

Multiple examples of absorbent products, including non-woven materials, follow below. The absorbent product is a wearable absorbent product. The characteristics of absorbent articles shared between products have the same reference numbers. According to the present invention, absorbent products, such as conventional diapers, absorbent products with belts, or pants-type diapers, or any other absorbent product, are as described above. Includes at least one area containing a non-woven fabric. The area preferably includes at least a partial waist and / or hip area of the absorbent product to provide comfort and fit around the waist. The hip region is defined as the region below the waist region and above the inseam region. It includes the hips, abdominal region, and the lower back and upper buttocks at level with the hips. The area can also be a leg structure within the inseam area, which allows the non-woven fabric to provide reduced friction on the user's skin when the contact surface contains moisture. Is. Also, the non-woven fabrics of the present invention can form at least part of the standing gather structure in the inseam region of the absorbent product, or it is one of the inseam elastic structures in the inseam region. It can be a department. The inseam elastic structure serves, among other things, to facilitate the absorbent product to take a bowl shape in the inseam area when the product is worn, thereby retaining waste products discharged from the body. Help to do.

The non-woven fabrics of the present invention are particularly suitable for use in areas outside the initial wetting or landing zones of absorbent products. This allows the non-woven fabric to cover the absorbent structure at least partially, but is preferably located outside the initial wetting zone or landing zone, i.e. the inseam where urine first lands. It means that it is located outside the area inside the part.

FIG. 5 schematically shows an absorbent article in the form of a panty liner 8 containing a non-woven fabric. By panty liner, it means an absorbent product that is used for sanitary products and is narrower than sanitary napkins. Panty liners absorb less fluid than sanitary napkins and are therefore intended for light fluid drainage and for daily cleanliness. The panty liner 8 includes a liquid-permeable top sheet 9, a liquid-impermeable back sheet 10, and an absorbent body 11 arranged between the top sheet 9 and the back sheet 10. The absorbent material main body 11 includes an absorbent material having an absorbent property and a super absorbent material. The panty liner 8 has a first spread in the longitudinal direction and a second spread in the transverse direction. Panty liner 8 comprises a non-woven fabric having fibers with a roughness of 0.1 dtex to 10 dtex, preferably a roughness of 2 dtex to 7 dtex. Fiber and / or non-woven materials are used in absorbent and / or hygienic products, at least on surfaces that are placed in contact with the user's skin during use of the absorbent product. Coated with a suitable lubricating coating component, it is referred to below as the lubricating coated non-woven fabric. This surface can be the entire topsheet 9 or can be part of a topsheet that resides outside the absorbent body 11 of the panty liner 8.

FIG. 6 schematically shows an absorbent article in the form of a sanitary napkin 12 containing a lubricated coated nonwoven fabric according to the present invention. The sanitary napkin 12 includes a liquid-permeable top sheet 9, a liquid-impermeable back sheet 10, and an absorbent body 11 arranged between the top sheet 9 and the back sheet 10. The absorbent material main body 11 includes an absorbent material having an absorbent property and a super absorbent material. Sanitary napkins have a first longitudinal spread and a second transverse spread. The sanitary napkin can include a wing 13, which is intended to be wrapped around the user's underwear to secure it properly. The sanitary napkin 12 comprises a non-woven fabric having a mixture of non-absorbent fibers and absorbent fibers, the non-absorbent fibers and / or the absorbent fibers are at least on the surface of the sanitary napkin 12 in contact with the skin. Has a roughness of 1dtex to 10dtex. This surface can be the entire topsheet 9, or can be part of the topsheet 9 that resides outside the absorbent body 11 of the sanitary napkin 12. A portion of the topsheet 9 present outside the absorbent body 11 of the sanitary napkin 12 can include a wing 13.

FIG. 7 schematically shows an absorbent article in the form of a diaper 16 including a lubricated coated nonwoven fabric according to the present invention. The diaper 16 includes a liquid-permeable top sheet 9, a liquid-impermeable back sheet 10, and an absorbent body 11 arranged between the top sheet 9 and the back sheet 10. The absorbent material main body 11 includes an absorbent material having an absorbent property and a super absorbent material. The diaper 16 has a first spread in the longitudinal direction and a second spread in the transverse direction. The diaper 16 includes a chassis 26, which includes a front panel 17, a crotch area 18, and a rear panel 19. Also, for example, an absorbent product in the form of a diaper includes fastening means 20 for fixing the front panel 17 and the rear panel 19 to each other, whereby the diaper 16 can be fixed around the wearer's waist. .. This type of diaper is a conventional open type diaper. The diaper 16 comprises a non-woven fabric having a mixture of non-absorbent fibers and absorbent fibers, the non-absorbent and / or absorbent fibers are at least 1dtex to 10dtex on the surface of the diaper 16 in contact with the skin. Has a roughness of. This surface can be the entire topsheet 9, or can be part of the topsheet 9 that resides outside the absorbent body 11 of the diaper 16. A portion of the topsheet 9 present outside the absorbent body 11 of the diaper 16 can be part of the front panel 17 or the entire front panel 17 and is one of the rear panels 19. It can be a part or the entire rear panel 19 and can be a fastening means 20. Diapers typically include a standing gather 21, which is intended to form a leakage barrier, for example, to prevent excess fluid from the absorbent body 11 from seeping out of the diaper. There is. Further, the standing gather 21 can include a non-woven fabric having a lubrication coating.

FIG. 8 schematically shows an absorbent article in the form of a pants-type diaper 22 containing a lubricated coated non-woven fabric according to the present invention. In contrast to traditional open diapers, such as those described in connection with FIG. 7, the front and rear panels 19 of the pants-type diaper chassis 26 are placed together by side seams from the beginning. It is fixed and thereby provides clothing that can be lifted onto the wearer in the same manner as regular underwear. The side seams can be made to be fractureable. The pants-type omelet 22 further includes a waist elastic material 23 and a leg elastic material 24, which is arranged to secure the pants-type omelet around the wearer's waist area. The leg elastic material 24 is arranged so as to fix a pants-type omelet around the wearer's leg. The waist elastic material 23 and the leg elastic material 24 may be covered with a lubricant-coated non-woven fabric material. In all other aspects, the pants-type diaper 22 is similar to the diaper 16, and the lubricated non-woven fabric is installed in the same area as described for the diaper 16.

FIG. 9 schematically shows an absorbent article in the form of a belt-type diaper 25 containing a lubricated coated non-woven fabric. These products are generally worn by adults and can be adapted for both incontinence and general use. Absorbent products with belts are provided with chassis 26 and two belt halves 27, 28. The chassis of the belt-type diaper 25 includes a front panel 17, a crotch area 18, and a rear panel 19. The chassis 26 can also include a standing gather 21. The belt halves 27, 28 are either attached to the chassis 26 extending from the outside of the rear panel 19 or are separated from the chassis 26 and arranged to be attached to the chassis 26. It has become. Belt halves 27, 28 are placed around the wearer's waist and fastened to hold an absorbent product with a belt around the wearer's waist using any suitable fastener. Is intended to be. In addition to the area of the chassis that can be covered by the lubricated non-woven fabric, the belt on the side of the belt that is placed in contact with the skin can also include the lubricated coated non-woven fabric.

The above description defines examples of embodiments of the invention, but should never be considered as limiting the invention. The present invention may be modified within the appended claims.

1 Non-woven fabric material
2 fiber
3 Meniscus
4 skin
6 curves
6a 1st slope
6b plateau
6c 2nd slope
6d peak
7 curves
7a 1st slope
7b plateau
7c 2nd slope
7d peak
8 panty liner
9 Top sheet
10 back seat
11 Absorbent body
12 Sanitary napkins
13 wing
16 diapers
17 Front panel
18 Inseam area
19 Rear panel
20 Fastening means
21 Standing gather
22 Pants type diapers
23 Waist elastic material
24 Leg elastic material
25 Belt type diapers
26 chassis
27 Belt half body
28 Belt half body
30 skin
32 fiber
34 Moisture
100 Forearm on the palm side
110 strip
112 Counterweight
114 clamp
120 Tensile tester

Claims (14)

An absorbent product (8; 12; 16; 22; 25) comprising a non-woven material (1) that is arranged to contact the user's skin during use of the absorbent product, said non-woven material (1). ) Contain the non-absorbable fiber and the absorbent fiber, the absorbent fiber is present in an amount of 2 to 30% by weight based on the total weight of the fiber in the non-woven fabric material (1), and the non-absorbent fiber and / fiber (2) or resorbable fibers, at least, the absorbent product (8; 25 12; 16; 22) on the surface during use is placed in contact with the user's skin With a roughness of 0.5 dtex to 3 dtex, the fiber (2) and / or the non-woven material (1) is provided by a lubricating coating component that reduces wet friction used in absorbent and / or sanitary products. coated, said suitable for reduction of the wet friction between the nonwoven material and the user's skin, the surface of the lubricating coating composition is arranged so as to be in contact with the user's skin during use of the absorbent products Being present and having the surface formed on one or more of the absorbent product's topsheet and / or waist area, hip area, standing gathers, leg openings or belts in the case of diapers. Characteristic, absorbent products (8; 12; 16; 22; 25). The absorbent product of claim 1 (8; 12; 16; 22; 25), wherein the lubricating coating component is selected from silicone oils. The absorbent product (8; 12; 16; 22; 25) according to claim 1 or 2, wherein the lubricating coating component is polydimethylsiloxane. 13. Absorbent products according to any one of the following (8; 12; 16; 22; 25). The absorbent product according to any one of claims 1 to 4, wherein the absorbent product is a diaper, incontinence protective clothing, a sanitary napkin, or a panty shield (8; 12; 16; 22; 25). The absorbent product (16; 22; 25) comprises a chassis with front and rear panels and an absorbent body (11) with a wetting zone for receiving urine and other bodily fluids, said nonwoven fabric material. The absorbent product (16; 22; twenty five). The absorbent product (16; 22; 25) according to claim 6, wherein the non-woven fabric material (1) is formed in at least an outer region of the absorbent material main body (11). The absorbent product (16; 22; 25) includes a waist area, hip area, standing gathers, and leg openings, and the non-woven material (1) is the waist area, hip area, standing gathers, and legs. The absorbent product according to any one of claims 5 to 7, characterized in that it is configured in at least one of the opening openings (16; 22; 25). The absorbent product (25) includes a belt attached to the chassis, or includes a belt separated from the chassis that is arranged so that it can be attached to the chassis, and the non-woven fabric is applied to the skin. characterized in that it is configured to the belt arranged not that the side in contact, the absorbent product according to any one of claims 5-8 (25). The absorbent product (8; 12; 16; 22; 25) includes a top sheet (9), an absorbent body (11), and a back sheet (10). 5. 9. The absorbent product (8; 12; 16; 22; 25) is configured in the top sheet (9) and / or the back sheet (10). The absorbent product according to any one of the following (8; 12; 16; 22; 25). The non-woven fabric material (1) is better than the non-woven fabric material (1) containing the fibers (2) and / or the non-woven fabric material (1) containing an uncoated non-woven fabric with a lubricating coating component in the presence of moisture. , And / or a fiber with a roughness finer than 0.1 dtex on a surface that is placed in contact with the user's skin during use of the absorbent product (8; 12; 16; 22; 25). It has a lower friction value than the non-woven fabric material (1) containing, which is measured by a curve obtained in a repeated run by measurement by the stick-and-slip method, the friction value in the curve being a repeated run. The curve includes a first slope having a positive coefficient indicating an increase in the friction value, a plateau, and a second slope having a negative coefficient indicating a decrease in the friction value. The absorbent product (8; 12; 16; 22; 25) according to any one of claims 1 to 10. The use of a non-woven material (1) in an absorbent or sanitary product to reduce wet friction between the non-woven material (1) and the user's skin, said non-woven material (1). Non-absorbent fibers and absorbent fibers are included, said absorbable fibers are present in an amount of 2-30% by weight, and fibers (2) which are non-absorbent fibers and / or absorbent fibers are 0.5 dtex to 3 dtex. The fibers (2) and / or the non-woven fabric material (1) have at least contact with the user's skin during use of the absorbent product (8; 12; 16; 22; 25). Use of a non-woven material (1), characterized in that it is coated with a lubricating coating component used in absorbent and / or sanitary products on a surface located in. The non-woven material (1) is characterized in that it is used in an absorbent product (8; 12; 16; 22; 25) selected from diapers, incontinence protective clothing, sanitary napkins, or panty shields. The use according to claim 12. 13. The use according to claim 13, wherein the non-woven material (1) is used in the non-absorbent region of the absorbent product (8; 12; 16; 22; 25).

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