FR2494989A1 - HYGIENIC TOWEL HAVING TWO ABSORBENT LAYERS - Google Patents

Abstract

The invention relates to multilayer sanitary products. A sanitary napkin notably comprises a fluid permeable cover 13, a fluid impermeable screen 14 and a two-layer absorbent element 10, 15. The absorbent material is characterized by different densities in the two layers. The layer closest to the wearer's body has a density between 0.4 and 1.0 g / cm ** 3 and the other layer has a higher density. The higher density layer preferably has compressed areas 12 for the purpose of directing the fluid. Application to the manufacture of sanitary napkins. (CF DRAWING IN BOPI)

Description

"Sanitary napkin with two layers of absorbent" This

  The invention relates to a sanitary napkin and relates more particularly to a towel

  hygienic having improved absorption power.

  A sanitary napkin generally consists of an absorbent layer, a fluid impermeable screen and an outer shell that covers both the absorbent layer and the screen and is permeable to the fluid. The fluid enters the absorbent layer through the fluid permeable cover material. It is desirable that the

  menstrual fluid is removed from the surface of the absorbing

  and essentially for two reasons. First of all,

  if the fluid spreads to the upper part of the absorption layer

  bante, facing the body and the underside of the

  covering material, the superficial pressure which the user

  seamer applied to the covering material may cause a return of fluid to the surface, i.e.

  crosses in the opposite direction the surface of the covering material.

  is lying. The more saturated the absorbent material, the more the phenomenon of fluid return to the surface is likely to occur. The second reason is aesthetic. The fact that the user sees a stained portion spreading on the upper surface of the absorbent layer is visually unpleasant and also gives the impression, usually

  wrong, that the absorbency of the towel is complete-

used.

  However, the desire to rapidly convey the fluid from the surface of the absorbent layer closest to the wearer's body can limit the useful absorption capacity of the towel, since by rapidly conveying the fluid to the through a central zone, the zone

  side of the towel is not fully used.

  Several attempts have been made either to route the fluid from the top surface of the absorbent or to use means of various densities for the purpose of directing the fluid to attempt to establish absorption.

  preferential in different areas of sanitary napkins.

  US Patent 3,545,441 describes an example of such a technique of employing an absorbent layer having a density gradient, with the denser portions concentrated toward the center of the absorbent mass. US Patent 3,494,362 discloses

  a slightly more complex configuration in which

  of absorbent material are separated by fibers of the same absorbent material which have been made more

  dense, for example by embossing, and-which are oriented

  pendicular to these layers. US Patent 1,910,872 discloses

  a sanitary napkin having three separate layers with a layer made denser located between two conventional cellulosic absorbent layers, of the type

  "Fluff". US Pat. No. 4,057,061 discloses a sanitary napkin.

  that the absorbent element is integrally constituted by a central absorbent volume which has been entirely reduced by compression. U.S. Patent Nos. 2,952,259 and 4,103,062 and GB Patent 1,563,697 disclose other sanitary napkins which

  use a compression and a multilayer structure.

  Although it has been recognized in the prior art that it is possible to use an absorbent material made more

  dense to direct the fluid and, in some cases, to increase

  the absorption capacity of the fluid, the corresponding devices

  In addition, the problem of avoiding the occurrence of spots in connection with the wetting of the upper absorbent layer, while ensuring a good use of the absorbent, has not been observed.

  been resolved completely satisfactorily.

  The sanitary napkin of the invention comprises

  a two-layer absorbent, it offers excellent resistance

  development of a stain and ensures

  maximum absorption capacity. We can make a service

  of this type using conventional manufacturing techniques.

  In accordance with the invention, a sanitary napkin

  that comprises two layers of absorbent, both constituted by a conventional cellulosic material in the form of sheet wadding. The top layer, i.e. the one closest to the user's body, has a density of 0.03 g / cm 2 to 0.15 g / cm 3. The second absorbent layer under the first absorbent layer has a density

  superior to the first. The second absorbent layer comprises

  compressed areas which are preferably located long

  tudinally along the surface of the layer and occupy 5 to 25% of the area of the surface. The combination of the relatively open pore structure represented by the upper absorbent layer and the relatively denser lower layer provides rapid transfer of the fluid through the top layer, in a localized area, and preferential absorption along the absorbent layer. lower. By adding compressed areas that are arranged longitudinally to the upper surface of the lower absorbent layer, ltex passing menstrual

  quickly the upper absorbent part is conveyed rapidly

  directionally along the surface of the bottom layer of absorbent, practically using

  uniform most of the lower absorbent layer.

  The compression of the lower surface of the absorbent layer can be carried out in various ways, including embossing, and when the compression is complete, 5 to 25%

  of the surface of the lower layer should be compressed.

  The density of the compressed layer is preferably between 0.40 and 1.0 g / cm3. To obtain the maximum absorption efficiency, the compressed regions must be sinuous and

oriented longitudinally.

  To obtain the maximum protection and efficiency with the towel of the invention, it is preferable that the screen

  impermeable to fluid is placed along the side of the

  and effectively covers a portion of the upper cover material. This is to allow a maximum longitudinal distribution of the fluid, without filtering

  or leaked by the sides. Due to the structure described above

  above, the lower layer of absorbent is used first and, after saturation, the lower part of the upper layer of absorbent material begins to perform a function

  However, because the fluid is initially

  Then, until the towel is almost completely used, there is no stain on the upper surface of the upper absorbent layer except in a very small area directly below the absorbent layer. of the initial penetration part of the fluid. In this way, the absorbent material of the two layers is more fully utilized. The invention will be better understood when reading

  the following description of an embodiment and in

  Referring to the accompanying drawing which is a perspective view and partially in section of the sanitary napkin of

the invention.

  Figure 1 shows a sanitary napkin which has an envelope 13 completely surrounding the other elements of the napkin. This towel is closed by melting the covering material on itself in the upper and lower parts, for example by means

  ultrasound, as shown in band 11 starting from the

  Longitudinal mites of the napkin. The napkin has an upper absorbent layer and an absorbent layer

  in which are formed compression lines

  sinuous lines which are indicated in the figure by lines

  The screen 14 is placed under the absorbing layers

  and it rises along the sides of the absorbent layers and also covers a portion of the absorbent layers in the upper part, placed at the upper absorbent coucve. Fastening means (not shown) are provided for securing the sanitary napkin to the undergarment of the user. These means are well known and generally consist of one or more adhesive strips formed in the lower part, that is to say the side side slip of the

sanitary napkin.

  The invention provides a simple combination ensuring maximum utilization of the absorbent material. Due to the effectiveness of this combination, it is possible to manufacture a towel of significantly reduced thickness having a power of

  absorbency equal to that of a towel of standard thickness

  than. A particularly advantageous embodiment of the invention consists of a towel having a thickness of absorptive layers of -13 mm to 6.5 mm. This towel behaves in a manner virtually identical to that of a sanitary napkin of conventional thickness not comprising

compressed or embossed areas.

  It goes without saying that many modifications can be made to the device described and shown,

  without departing from the scope of the invention.

Claims (6)

CLAIMS ONS   A sanitary napkin comprising a fluid-permeable envelope (13), a fluid-impermeable screen (14) and an absorbent member (10, 15), characterized in that the absorbent member comprises a first absorbent layer (10) located on the side of the user and having a density of 0.03 g / cm3 to 0.15 g / cm3 and a second absorbent layer (15) on the opposite side to the user and having a   density higher than that of the first absorbent layer.   Sanitary napkin according to claim 1, characterized in that the second layer (15) is compressed   about 5 to 25% of its surface.   Sanitary napkin according to claim 2, characterized in that the density of the compressed zone is   between 0.40 g / cm3 and 1.0 g / cm3.   4. Sanitary napkin according to claim 2, characterized in that the compression is essentially longitudinal. Sanitary napkin according to claim 2, characterized in that the compression is effected by embossing. A sanitary napkin according to claim 5, characterized in that the lower layer (15) comprises a sinuous winding nose (12) extending along the length thereof. the surface longitudinal of the towel.