WO2010144061A1

WO2010144061A1 - Hygienic tampon, optionally a digital or applicator tampon, as well as apparatus and method for manufacturing thereof

Info

Publication number: WO2010144061A1
Application number: PCT/SI2009/000035
Authority: WO
Inventors: Andrej Zabret
Original assignee: Tosama Tovarna Sanitetnega Materiala D.D.
Priority date: 2009-06-12
Filing date: 2009-08-20
Publication date: 2010-12-16
Also published as: US9050215B2; EP2440169B2; CA2763865A1; SI23070B; RU2012100357A; EP2440169B1; SI23070A; AU2009347886A1; US20120130335A1; CA2763865C; EP2440169A1; CN102802578A; CN102802578B; RU2495654C2; AU2009347886B2

Abstract

Hygienic tampon (1) consisting of absorbent fibrous material on the basis of natural and/or artificial fibers of each desired structure, which is formed into at least approximately cylindrical blank (10), which is symmetric with regard to a longitudinal axis (100) defining a direction of inserting the tampon (1) into each desired cavity of a human body. Such tampon (1) comprises four pairs of grooves (11, 12, 13, 14, 15, 16, 17, 18), which are equidistantly arranged in the circumferential direction of the tampon (1). Two pairs of grooves (11, 13, 15, 17) having a pre-determined width (B1) and depth (T1) are pressed in two planes being perpendicular to each other and coinciding with the longitudinal axis (100). The other two pairs of grooves (12, 14, 16, 18) having a pre-determined width (B2) and depth (T2) are pressed in two planes, which are perpendicular to each other and coincide with the longitudinal axis (100) under 45° with respect to previously mentioned planes.

Description

Hygienic tampon, optionally a digital or applicator tampon, as well as apparatus and method for manufacturing thereof

The present invention relates to a tampon, in particular to a hygienic tampon. Pursuant to the International Patent Classification, such inventions belong to medicine and hygiene, namely to tampons, in particular to menstrual hygienic tampons and corresponding accessories.

The purpose of the invention is to create a tampon, which could consist of the same raw materials and could be manufactured on the same machines and by means of the same operations as commercially interesting known tampons, wherein the stability of such tampon, namely a bending and buckling strength, would have to be as high as possible, and wherein upon exposing such tampon to moisture the shape thereof should change gradually and in appropriate manner, so that the absorbing capacity would have to be at least equal or even higher than by the known tampons, and penetration of liquid in the longitudinal direction of the tampon should be sufficiently decelerated in order to reduce the probability of leakage of said liquid out from a completely saturated tampon. A tampon is disclosed in EP 0 422 660, which consists of a non-woven fibrous blank, which is formed by winding up a non-woven fibrous tape around the longitudinal axis, unless at least approximately cylindrical blank is obtained, which is then radially pressed by means of adequate pressing jaws, e.g. by means of a pressing device according to DE 19, 825 877, formed into a desired tampon. Such a tampon is generally still available in a cylindrical form, although grooves are formed on its external surface, which are directed radially inwards and extend in the longitudinal direction along said external surface of the tampon i.e. parallel with respect to the longitudinal i.e. the central axis of the tampon. Such tampons are known to those skilled in the art as "digital" tampons. A rib is available between each two neighboring grooves, by which the circumferential surface of said ribs determines the outer diameter of such tampon, and the bottom surfaces of said grooves determine the diameter of relatively high-compressed core of such tampon. Due to smooth subsequently compression of such tampon just in the area of said ribs, each available lateral surfaces of each rib become convex i.e. sloped, and the corresponding lateral surfaces of each two neighboring ribs are brought into mutual contact, by which a tubular space is formed adjacent to said compressed core, which extend parallel to the longitudinal axis of the tampon. Such structure should result in certain benefits, namely increasing of buckling strength and in particular also increasing of specific absorption including increasing of absorption rate in the longitudinal direction of the tampon. Stability of the tampon is of great importance when bearing in mind entrusting from the side of each user, which is quite important whenever the tampon is inserted. Although in the above cited document the absorption rate is declared as an important feature, It is actually completely disregarded by each user, since some other features appear to be much more important during the practical use of such products. Accordingly, specific absorption seems to be quite important, which means each quantity of liquid, which can be absorbed by each tampon, by which also the weight of the tampon needs to be taken into account, and moreover also the wax, how the tampon is transformed upon being exposed to the moisture. As soon as appropriate end portion of the tampon according to EP 0 422 660 is exposed to the moisture, said end portion is capable to receive a relatively high quantity of liquid in a relatively short time period, by which said end portion of the tampon is then quickly expanding and becomes trumpet-like widened. Consequently, whenever some greater amount of the liquid needs to be absorbed, for example in the case of intensive menstruation, some leakage of previously absorbed liquid may easily occur from such quickly expanded end portion.

In addition to aid tampon, EP 0 422 660 also discloses a device and a process for manufacturing tampons of previously described art. Process of manufacturing has been roughly disclosed by means of description of concept and structure of the tampon as such, while a corresponding apparatus in addition to radial pressing jaws for forming grooves also includes appropriate means for subsequently applying each required pressure towards the circumferential surfaces of the ribs, wherein said means is preferably a conical die, through which the tampon is forwarded upon the ribs and grooves have already been formed thereon. However, applying such process should normally lead to obtaining a product with the previously identified deficiencies.

In order to further improve the absorption capacity, a tampon has been developed, which is disclosed in WO 01/075357 A3 and which is generally obtained from the same blank consisting of the same raw material like previously described tampon, wherein on the external surface of such tampon appropriate grooves and ribs are formed in practically the same manner i.e. by means of radial compression. However, in this case the ribs are not formed in the longitudinal direction of the tampon, but extend helically i.e. in the form of a helix under a relatively small angle relatively to the longitudinal axis of the tampon. Thanks to such approach, the overall length of ribs and grooves is correspondingly increased, by which the probability of leakage should be adequately reduced. However, manufacturing such tampon requires much more comprehensive technology when compared with technology of manufacturing tampons with ribs and grooves, which extend parallel with respect to the longitudinal axis of the tampon.

Moreover, the so-called tampon applicators are also known in the field of packaging and inserting such tampons.

A classic applicator, which is described e.g. in US 3,643,661, consisting of a tampon inserted within an outer tube, into which an inner tube is inserted, which is - when observed in the direction of inserting the tampon - located behind of said tampon, wherein the outer diameter of said inner tube essentially corresponds to the inner diameter of the outer tube, so that by displacing said inner tube in the direction towards the tampon the last is pushed outwards from the outer tube and inserted or otherwise placed into each desired position. Essential length of such tampon is deemed to present the main deficiency of such applicators.

Recently developed applicators, so called "compact" applicators are essentially, shorter and much more comfortable, consisting thereby analogously of an inner tube inserted within an outer tube, as well as of a tampon, which is in its original position inserted within the inner tube and is - like e.g. in the applicator with a digital tampon according to EP 1 704 841 or in applicator with classic compressed tampon without ribs and grooves on the external surface according to US 4,479,791 - maintained in such position by means of retaining means, which are located within the outer tube in the vicinity of the inserting end portion thereof. When the inner tube is displaced in a direction away from said inserting end portion, the tampon remains in its position thanks to the above mentioned retaining means, by which the tampon is moved outwards from the inside area of the inner tube in order to remain stored within the outer tube. During the subsequent displacement of the inner tube towards the tampon i.e. towards the inserting end portion, the inner tube is rest onto the tampon in order to push it outwards from the interior of the outer tube. In order to improve cooperation between the tampon and said retaining means, the tampon is furnished on its inserting end portion with a mushroom-like or rivet-like head. Such tampon is e.g. disclosed in EP 0 355 396. In certain other cases, where said retaining and extracting of tampon is enabled in some different manner (like e.g. according to UAS 4,291, 694), forming such head on the tampon may also be avoided.

It is therefore obvious that such tampons, which may however practically also be used as digital tampons without the applicator, are used as applicator tampons and represent as such a part of the applicator or the applicator assembly, but are within the context of the present invention exposed to the same problems and to the same inventive concept, by which anyone of arising problems is then resolved.

The present invention on the one hand refers to a hygienic tampon, optionally a digital or applicator tampon, which consists of absorbent non-woven fibrous material on the basis of natural or synthetic fibers of each desired structure and is formed into a cylindrical blank. Such a tampon is preferably formed symmetrically with respect to the longitudinal axis, which extends in a direction of inserting tampon to each desired location, in particular into a cavity of the human body. For the purposes of easier inserting, such tampon preferably comprises appropriately adapted inserting end portion, whilst the opposite end portion is furnished with preferably non-removable string. Moreover, at least approximately in the longitudinal direction of the tampon i.e. at least approximately parallel with regard to the longitudinal axis extending grooves are formed on the external surface of the tampon, which are equidistantly spaced apart from each other in the circumferential direction of the tampon, so that between each two neighboring grooves there is a rib, which comprises an external surface, by means of which as well as by means of the external surface of each opposite rib with regard to the silhouette of the tampon the cross-section thereof, a transversal dimension of the tampon then is defined, while on the other hand the compressed core of the tampon, which consists of an absorbent fibrous material, is defined by means of appropriate bottom surfaces of said grooves.

The tampon according to the invention comprising four pairs of equidistantly spaced grooves arranged on its external surface, where two pairs of grooves having appropriately pre-determined width B 1 and being pressed up to appropriately predetermined depth Tl are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis of the blank, while the other two pairs of grooves having appropriately pre-determined width B2 and being pressed up to appropriately pre-determined depth T2 are arranged in another two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis of the blank, but are rotated for 45° around said longitudinal axis relatively to the planes of the previously mentioned groves, wherein each width Bl, B2 and each depth Tl, T2 of pressed grooves is determined in such a manner that the shape of the silhouette or of the cross-section of such obtained tampon essentially corresponds to a flattened circle or to a rounded square having rounded corner areas, by which the distance between each two opposite corner areas on the external surface of the tampon is for approx. 10 to 35% greater than the distance between each two opposite lateral areas on the external surface of the tampon.

In this, each width Bl, B2 and each depth Tl, T2 of such pressed grooves is determined in such a manner that either the following condition is fulfilled

Tl ≠ T2 and Bl = B2, or that

Tl ≠ T2 and Bl > B2, or optionally that

T1 ≠ T2 and Bl < B2.

An embodiment of the tampon is foreseen, in which all grooves extend along the complete of the length of the tampon, while in another possible embodiment at least four grooves having the same width and the same depth extend along the complete length of the tampon.

Furthermore, the tampon according to the invention may comprise a narrowed and slightly rounded inserting end portion, although another embodiment is also possible, in which the inserting end portion of the tampon is widened, in particular mushroom-shaped or rivet-shaped. In such a case, all preferably extend along the majority of the length of the tampon.

Still further, the tampon according to the invention is available either as a digital tampon, namely a tampon, which is adapted for inserting by means of fingers on a single hand, or alternatively as an applicator tampon which is adapted to cooperate with appropriate applicator assembly.

Besides, a liquid permeable wrapper may be foreseen on the external surface of the tampon, which may extend over at least a portion of said external surface of the tampon.

On the other hand, the present invention also refers to an apparatus for manufacturing a tampon in accordance with the previously mentioned features, wherein such apparatus comprising a device, which is adapted for manufacturing of such tampon on the basis of pressing a corresponding blank in its radial direction towards the longitudinal axis thereof by means of four pairs of pressing jaws, which are equidistantly spaced apart from each other in the circumferential direction of said blank..

According to the invention, two pairs of jaws of appropriately pre-determined width Bl are adapted for pressing up to appropriately pre-determined depth Tl and are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis of the blank, while the other two pairs of pressing jaws of appropriately pre-determined width B2 are adapted for pressing up to appropriately pre-determined depth T2 and are arranged in another two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis of the blank, but are rotated for 45° around said longitudinal axis relatively to said planes of the previously mentioned pressing jaws, wherein each width Bl, B2 of pressing jaws and each depth Tl, T2 of pressing jaws is determined in such a manner that the shape of the silhouette or the cross-section of each obtained tampon essentially corresponds to a flattened circle or a rounded square having rounded corner areas, by which the distance between each two opposite corner areas on the external surface of the tampon is for approx. 10 to 35% greater than the distance between each two opposite lateral areas on the external surface of the tampon.

Apparatus according to the invention is designed in such a manner that each width Bl, B2 of said pressing jaws and each depth Tl, T2 of pressing by such jaws is determined in such a manner that either the following condition is fulfilled

Tl ≠ T2 and Bl = B2, or that

Tl ≠ T2 and Bl > B2, or optionally that

T1 ≠ T2 and BK B2.

The present invention further relates to a method of manufacturing a tampon in accordance with the previously described features. Such method generally comprising steps of preparing a tape-shaped mate consisting of fibrous material of each desired structure, which are compressed or concentrated in any other way into a desired form of vlies or a mate or any other non- woven fabric; winding up said band around the longitudinal axis by simultaneously inserting a string in order to obtain an approximately cylindrical blank; radial compression of said blank by means of a pressing device, which is adapted to form appropriate grooves on the circumferential surface of the blank in order to obtain a tampon. In accordance with the present invention, the lastly mentioned step of compression of the blank into a tampon is performed by means of four pairs of pressing jaws, which are directed radially towards the longitudinal axis of the blank and are equidistantly spaced apart from each other around the circumference of said blank, where two pairs of pressing jaws having a pre-determined width Bl are intended for pressing up to a pre-determined depth Tl and are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis of the blank, while the other two pairs of pressing jaws having a predetermined width B are adapted for pressing up to a pre-determined depth T2 and are arranged in other two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis of the blank, but are rotated for 45° around said longitudinal axis relatively to said planes of the previously mentioned pressing jaws, wherein each width Bl, B2 of pressing jaws and each depth Tl, T2 of pressing jaws is determined in such a manner that the shape of the silhouette or the cross-section of each obtained tampon essentially corresponds to a flattened circle or a rounded square having rounded corner areas, by which the distance A2 between each two opposite corner areas on the external surface of the tampon is for approx. 10 to 35% greater than the distance Al between each two opposite lateral areas on the external surface of the tampon.

Said step of compression of the tampon in accordance with said method according to the invention is characterized in that each width Bl, B2 of said pressing jaws and each depth Tl, T2 of pressing by such jaws is determined in such a manner that either the following condition is fulfilled

Tl ≠ T2 and Bl = B2, or that

Tl ≠ T2 and Bl > B2, or optionally that

T1 ≠ T2 and Bl < B2.

Now the invention will be described in more detail on the basis of embodiments, which are exclusively for illustrative purposes and without limitation with respect to the scope of the invention shown in the enclosed drawings, wherein

Fig. 1 is a schematically shown perspective view of an idealized tampon according to the invention; Fig. 2 is also a schematically shown top view of a device for manufacturing tampons according to the invention, observed in the axial direction of tampon; Fig. 3 is a top view of a further embodiment of the tampon according the invention; Fig. 4 is a top view of a still further embodiment of the tampon according the invention; Fig. 5 shows a tampon according to Fig. 1 upon being exposed to the moisture in the area of its end portion; Fig. 6 shows an analogous digital tampon according to prior art, also upon being exposed to the moisture in the area of its end portion.

Tampon 1 according to the invention consists of absorptive non-woven fibrous material, preferably on the basis of natural fibers e.g. of cellulose, or optionally of a combination of natural and synthetic fibers. Tampon 1 is formed symmetrically with respect to its longitudinal axis 100 and - when bearing in mind the direction of inserting thereof - comprises a forward portion, namely an inserting portion 111, as well as a rearward portion 112, in the area of which the tampon 1 is furnished with a cord 113.

A silhouette or a transversal cross-section of the tampon according to the invention is flattened along two planes, which are perpendicular to each other, and essentially corresponds to a flattened circle or to a square having rounded corner areas. Eight grooves 11, 12, 13, 14 15, 16, 17, 18 are formed on the external surface of the tampon 1 , which are in the circumferential direction equally spaced apart from each other and are in the longitudinal direction of the tampon 1 extending parallel to the longitudinal axis 100 of the tampon 1. Said grooves 11, 12, 13, 14 15, 16, 17, 18 generally extend along at least a part of the complete length L of the tampon 1. Regarding the tampon according to Fig. 1 , said grooves 11, 12, 13, 14 15, 16, 17, 18 extend over the complete length L of the tampon 1, while in other possible embodiments, e.g. in those according to Figs. 3 and 4, may extend just along certain portion of the tampon 1 length L.

Said grooves 11, 12, 13, 14 15, 16, 17, 18 are preferably formed in such a way that four grooves 11, 13, 15, 17, which are located in two planes, which are oriented perpendicular with respect to each other and extend throughout the longitudinal axis 100, are formed in at least approximately in same dimensions, and are preferably identical, at least regarding the width Bl and the depth Tl thereof. The other four grooves 12, 14, 16, 18, which are located in other two planes, which are also perpendicular with respect to each other and extend throughout the longitudinal axis 100 of the tampon, and are moreover rotated for 45° around said axis 100 relatively to previously mentioned planes, are also formed in at least approximately similar, preferably identical, dimensions at least with respect to the width B2 and the depth T2 thereof, wherein these dimensions B2, T2 are different with respect to dimensions of the previously mentioned grooves 11, 13, 15, 17.

Regarding the shown embodiment, the grooves 11, 13, 15, 17 having the width Bl and the depth Tl are pressed on the external surface of the tampon 1, and also the grooves 12, 14, 16, 18 having the width B2 and the depth T2. Each groove 11, 13, 15, 16 having the width Bl and the depth Tl is located between two neighboring grooves 12, 14, 16, 18 having the width B2 and the depth T2, or vice versa.

Those skilled in the art should understand that an idealized shape of the silhouette or the cross-section is shown in Fig. 1, which is determined by the shape of pressing jaws 21, 22, 23, 24, 25, 26, 27, 28 of the pressing device 20 (Fig. 2). Actual dimensions of grooves 11, 12, 13, 14 15, 16, 17, 18 may generally depend on at least certain parameters, e.g. on each structure of fibers of a blank 10, on pressure achieved by pressing jaws 21, 22, 23, 24, 25, 26, 27, 28 and also on dimensions Bl, Tl; B2, T2 of the pressing jaws 21, 22, 23, 24, 25, 26, 27, 28 in each pressing device 20.

Moreover, a rib 19 is available between each two neighboring grooves 11, 12, 13, 14, 15, 16, 17, 18 of the tampon 1 according to the invention, and its external surface together with the external surface of each opposite rib 19 regarding the silhouette or the cross-section of the tampon 1 defines the overall dimension Al, A2 in the transversal direction of the tampon 1 , whilst the bottom surfaces of the grooves 11, 12, 13, 14, 15, 16, 17, 18 define a correspondingly compressed core of the tampon 1 consisting of absorbent fibrous material. When bearing in mind that said grooves 11, 12, 13, 14, 15, 16, 17, 18 are formed by means of radial pressing of the blank 10 into corresponding shape of the tampon 1, each available cross-section of the tampon 1 is then not e.g. of essentially circular shape but is thanks to the presence of said grooves 11, 12, 13, 14, 15, 16, 17, 18 in two pairs of mutually rectangular and correspondingly pivoted pairs of planes available in the shape of a square having rounded corner areas (Fig.l), wherein such square having rounded corner areas is then defined by means of thickness Al between each opposite lateral surfaces as well as of diagonal distance between each two opposite rounded corner areas.

The dimensions of the silhouette or the transversal cross-section of the tampon 1 , namely the width Bl, B2 and the depth Tl, Tl of grooves 11, 12, 13, 14, 15, 16, 17, 18, are preferably determined in such a way that the diagonal distance A2 is for approx. 10 to 35% greater than the thickness Al of the tampon 1.

Those skilled in the art are aware of the presence of various embodiments of tampons on the market, which may however with respect to quite physiologic requirements regarding the target users be arranged into three main groups. The average size of tampons is normally designated as "normal", by which such "normal" class is then defined by appropriate range of diameters and the length L of the tampon 1.

The tampon 1 according to the invention is formed in such a way that either its thickness Al or its diagonal size A2 corresponds to the common size of the diameter of such tampons. The first one of both these possibilities is however preferred and may also easily be compared with the prior art, since the quantity of each available absorbent fibrous material is then essentially the same or very similar as in a common cylindrical tampon 1 in the class "normal". On the other hand, appropriately modified silhouette and cross section of the tampon according to the invention excels in correspondingly greater cross-section surface with regard to the cylindrical tampon 1 according to prior art, providing that both of them are consisting of the same quantity of the absorbent fibrous material, and moreover, the moment of inertia of such cross-section is also enhanced, which obviously leads to increasing of stability, namely increasing of stiffness of tampon when being bent or exposed to buckling.

A further embodiment of the tampon 1 according to the invention is shown in Fig. 3, wherein the inserting end portion 111 is slightly rounded in order to enable easily inserting.

A still further embodiment of the tampon 1 according to the invention is shown in Fig. 4, wherein the inserting end portion 111 is bulked, by which such tampon 1 may then be used in appropriate applicator.

In both these lastly mentioned embodiments, the grooves 11, 12, 13, 14, 15, 16, 17, 18 extend along the majority of the length L of the tampon 1.

Besides, the tampon 1 may be furnished with a liquid permeable wrapper, which may extend along the complete external surface of the tampon or along at least a portion thereof.

The inserting end portion of the tampon 1 according to the invention, which is shown in Fig. 5, is exposed to the same quantity of liquid as the tampon 1 according to prior art, which is shown in Fig. 6. When exposed to the moisture, the tampon 1 according to the invention is expanded and becomes bulky like any other tampon. However, expanding of tampon 1 according to the invention occurs gradually, by which the external surfaces is transformed into a bat-like shape. On the contrary, the comparative digital tampon 1 according to the prior art (like e.g. a tampon according to EP 0 422 660) having the same length L and consisting of equal amount of the fibrous material is expanded essentially quicker, by which its external surface is transformed into a trumpet-like shape. Consequently, the sealing capability of the tampon 1 according to the invention is essentially improved, and the possibility of any leakage of the fluid, which has been absorbed by the tampon 1 , is correspondingly reduced.

Example

Benefits of the tampon 1 within the scope of the present invention may also be presented on the basis of results obtained by measuring the most important characteristics, which are shown in Table 1 and 2 below.

Regarding Table 1, the data illustrate comparing relevant characteristics of a classic tampon, named as "Tampon 8+0", of average size "Normal", with a tampon according to the invention having the same size and consisting of the same material, which is in said Table named as "Tampon 4+4". Said "Tampon 8+0" comprises eight ribs and grooves available on the external surface thereof, and having the outer diameter of approx. 12,5 mm, while the weight of the dry tampon is approx. 2,5 g. The tampon according to the invention (i.e. "Tampon 4+4") is furnished with two pairs of grooves 11, 13, 15, 17 of greater depth and two pairs of grooves 12, 14, 16, 18 of smaller depth, but the weight and overall size thereof essentially correspond to the previously mentioned classic tampon (i.e. "Tampon 8 O"). On the other hand, the data in the Table 2 illustrate comparison of characteristics of some greater tampons 1, namely of "Tampon 8+1" and Tampon 4+4", which belong to the group "Super", by which the outer diameter of such tampon 1 without packaging wrapper is approx. 14,5 mm, and the weight of a dry tampon 1 is approx. 3,2 g.

Table 1

Table 2 Concerning both tables, the tampon weight (given in gram) means the weight of a compressed fibrous material in a dry (non-used) tampon prior to inserting into corresponding packaging or immediately upon removal said packaging i.e. said wrapper. The diameter of tampon is a maximum outer diameter of the tampon in the area of ribs 19.

The term "Syngina" means experimental value of the liquid, which is absorbed by the tampon when exposed to moisture on the one end portion within a predetermined time, and which is then measured and expressed in grams. This is a commonly recognized professional examination and there is no need to express in more detail all prescribed conditions and requirements, which must be taken into account during execution thereof. In general, kinetic of absorbing the liquid is observed at the body temperature 37°C and by simultaneously simulating of the vaginal pressure. The tampon 1 is exposed to the liquid, which is a so called "artificial blood" (German abbreviation is BE and English abbreviation is SB). Values in Table 1 and 2 refer to each quantity of such artificial blood after a predetermined time period, and also maximum values, which are absorbed by each tampon 1 up to the moment, when the leakage occurs.

On the other hand, the term "EDANA" means a static examination of absorptiveness of the tampon 1 , in which the end portion 111 of each tampon 1 is permanently and with constant velocity supplied by the liquid unless the tampon 1 becomes completely saturated. As soon as the maximum absorption is achieved and the leakage of the tampon 1 occurs, the amount of the absorbed liquid is measured and expressed per weight of the tampon 1 in grams, and such specific absorption is presented in the Table 1 and 2 as the "Capacity (g/g)". The liquid has been 1% solution of NaCl in water, and the measuring has been performed at 27°C. The term "stability" in Table 1 and 2 refers to examining a tampon with regard to strength thereof when exposed to pressure and buckling in its longitudinal i.e. axial direction, by which the values in Table 1 and 2 mean each force (expressed in N), which results in buckling or destruction of the tampon.

As evident from results given in the Table 1 and 2, stability of the tampon according to the invention ("Tampon 4+4") is at least such and mostly greater than stability of the classic tampon ("Tampon 8+0"). Significant benefits of the tampon 1 according to the invention also result from the kinetics of absorption during a pre-determined time period. Just for illustrative purposes, such kinetics is also graphically presented in Diagram 1, but only for "Normal" size of the tampon 1.

Syngina - Test Normal

Normal 8 + 0 Normal 4 + 4

20 40 1 2 3 5 10 15 sec sec min min min min min min

Time (min)

Diagram 1

As evident in said Diagram, during the early phase of using the tampon 1 according to the invention ("Tampon 4+4"; size "Normal"), absorption is relatively low, but is then intensively increasing towards the end period of the use, so that the specific absorptiveness (g/g) of such used tampon 1 reaches the specific absorptiveness (g/g) of the known tampon. The reason for that has already been explained in relationship with the phenomena, which is shown in Figs. 5 and 6.

A device 20 for manufacturing of tampons 1 according to the invention comprises four pairs of pressing jaws 21, 22, 23, 24, 25, 26, 27, 28, which are equidistantly arranged around the circumference of a blank 10, wherein two pairs of jaws 21, 23, 25, 27 having the width Bl and being adapted for pressing up to the depth Tl are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis 100 of the blank 10, while the other two pairs of jaws 22, 24, 26, 28 having the width B2 and being adapted for pressing up to the depth T2 are arranged in other two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis 100 of the blank 10, but are rotated for 45° around said longitudinal axis 100 with respect to said planes of the previously mentioned pressing jaws 21, 23, 25, 27. Accordingly, two pairs of jaws 21, 23, 25, 27 having the width Bl are intended for pressing up to the depth Tl and are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis 100 of the blank 10, while the other two pairs of jaws 22, 24, 26, 28 having the width B2 are adapted for pressing up to the depth T2 and are arranged in other two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis 100 of the blank 10, but are rotated for 45° around said longitudinal axis 100 relatively to said planes of the previously mentioned pressing jaws 21, 23, 25, 27. Moreover, each width Bl, B2 and each depth Tl, T2 of pressing by jaws is determined in such a manner that the condition Tl ≠ T2 is fulfilled when either Bl = B2 or when Bl < B2 or even when Bl > B2. Such tampon 1 is made by process, which is performed by means of the device according to Fig. 1 , and which includes steps of preparing a tape-shaped mate consisting of fibrous material of a previously mentioned structure, which are compressed or concentrated in any other way into a desired form like mate or vlies or any other non-woven fabric; winding up said tape-shaped mate around the longitudinal axis 100 by simultaneously inserting a string 13 in order to obtain an approximately cylindrical blank 10; compression of said blank 10 by means of a pressing device 20 comprising four pairs of pressing jaws 21, 22, 23, 24, 25, 26, 27, 28, which extend radially towards the longitudinal axis 100 of the blank and are arranged equidistantly spaced apart from each other around the circumference of the blank 10, wherein two pairs of jaws 21, 23, 25, 27 having the width Bl are intended for pressing up to the depth Tl and are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis 100 of the blank 10, while the other two pairs of jaws 22, 24, 26, 28 having the width B2 are adapted for pressing up to the depth T2 and are arranged in other two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis 100 of the blank 10, but are rotated for 45° around said longitudinal axis 100 relatively to said planes of the previously mentioned pressing jaws 21, 23, 25, 27.In this, each width Bl, B2 and each depth Tl, T2 of pressing by jaws is determined in such a manner that the condition Tl ≠ T2 is fulfilled when either Bl = B2 or when Bl < B2 or when Bl > B2.

Claims

PATENT CLAIMS

1. Hygienic tampon, optionally a digital or applicator tampon (1), consisting of absorbent non-woven fibrous material on the basis of natural or synthetic fibers of each desired structure and being formed into a cylindrical blank (10) symmetrically with respect to the longitudinal axis (100) extending in a direction of inserting tampon to each desired location, in particular into a cavity of the human body, where for the purposes of easier inserting such tampon (1) preferably comprises appropriately adapted inserting end portion (111), and the opposite end portion (112) is furnished with preferably non-removable string (113), and wherein on the external surface of the tampon (1) at least approximately in the longitudinal direction thereof i.e. at least approximately parallel with regard to the longitudinal axis (100) extending grooves (11, 12, 13, 14, 15, 16, 17, 18) are formed, which are equidistantly spaced apart from each other in the circumferential direction of the tampon (1) and extend over the majority of the length (L) of the tampon (1), so that between each two neighboring grooves (11, 12, 13, 14, 15, 16, 17, 18) there is a rib (19), which comprises an external surface, by means of which as well as of the external surface of each opposite rib (19) with regard to the silhouette of the tampon (1) or to its cross-section, a transversal dimension (Al, A2) of the tampon (1) is defined, while on the other hand the compressed core of the tampon (1), which consists of an absorbent fibrous material, is defined by means of appropriate bottom surfaces of said grooves (11, 12, 13, 14, 15, 16, 17, 18), characterized in that four pairs of equidistantly spaced grooves (11, 12, 13, 14, 15, 16, 17, 18) are foreseen on its external surface, wherein two pairs of grooves (11, 13, 15, 17) of appropriately pre-determined width (Bl) are pressed up to appropriately predetermined depth (Tl) and are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis (100) of the blank (10), while the other two pairs of grooves (12, 14, 16, 18) of appropriately pre-determined width (B2) are pressed up to appropriately predetermined depth (T2) and are arranged in another two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis (100) of the blank (10), but are rotated for 45° around said longitudinal axis (100) relatively to said planes of the previously mentioned groves (11, 13, 15, 17), wherein each width (Bl, B2) and each depth (Tl, T2) of pressed grooves (11, 12, 13, 14, 15, 16, 17, 18) is determined in such a manner that the shape of the silhouette or cross-section of such obtained tampon (1) essentially corresponds to a flattened circle or a rounded square having rounded corner areas, by which the distance (A2) between each two opposite corner areas on the external surface of the tampon (1) is for approx. 10 to 35% greater than the distance (Al) between each two opposite lateral areas on the external surface of the tampon (1).

2. Tampon according to Claim 1, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressed grooves (11, 12, 13, 14, 15, 16, 17, 18) is determined in such a manner that the following condition is fulfilled

T1 ≠ T2 and Bl = B2.

3. Tampon according to Claim 1, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressed grooves (11, 12, 13, 14, 15, 16, 17, 18) is determined in such a manner that the following condition is fulfilled

Tl ≠ T2 and Bl > B2.

4. Tampon according to Claim 1, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressed grooves (11, 12, 13, 14, 15, 16, 17, 18) is determined in such a manner that the following condition is fulfilled

T1 ≠ T2 and BK B2.

5. Tampon according to anyone of Claims 1 - 4, characterized in that all grooves (11, 12, 13, 14, 15, 16, 17, 18) extend along the complete of the length (L) of the tampon (1).

6. Tampon according to anyone of Claims 1 - 4, characterized in that at least four grooves (11, 12, 13, 14, 15, 16, 17, 18) having the same width (Bl, B2) and the same depth (Tl, T2) extend along the complete length (L) of the tampon (1).

7. Tampon according to anyone of Claims 1 - 6, characterized in that the inserting end portion (11 1) thereof is narrowed and slightly rounded.

8. Tampon according to anyone of Claims 1 - 6, characterized in that the inserting end portion (111) thereof is widened, in particular mushroom-shaped or rivet-shaped.

9. Tampon according to Claim 8, characterized in that all grooves (11, 12, 13, 14, 15, 16, 17, 18) extend along the majority of the length (L) of the tampon

(I)-

10. Tampon according to anyone of Claims 1 - 9, characterized in that it is available as a digital tampon (1), namely a tampon (1), which is adapted for inserting by means of fingers on a single hand.

1 1. Tampon according to anyone of Claims 1 - 9, characterized in that it is available as an applicator tampon (1), namely a tampon, (1) which is adapted to cooperate with appropriate applicator assembly.

12. Tampon according to anyone of Claims 1 - 9, characterized in that a liquid permeable wrapper is foreseen on the external surface of the tampon (1), which extends over at least a portion of said external surface of the tampon (1).

13. Apparatus for manufacturing a tampon according to any of the preceding Claims, comprising a device (20) for manufacturing of such tampon (1) on the basis of pressing a corresponding blank (10) in its radial direction towards the longitudinal axis (100) thereof by means of four pairs of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28), which are equidistantly spaced apart from each other in the circumferential direction of said blank (10), characterized in that two pairs of jaws (21, 23, 25, 27) of appropriately pre-determined width (Bl) are adapted for pressing up to appropriately pre-determined depth (Tl) and are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis (100) of the blank (10), while the other two pairs of pressing jaws (22, 24, 26, 28) of appropriately pre-determined width (B2) are adapted for pressing up to appropriately pre-determined depth (T2) and are arranged in another two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis (100) of the blank (10), but are rotated for 45° around said longitudinal axis (100) relatively to said planes of the previously mentioned pressing jaws (21, 23, 25, 27), wherein each width (Bl, B2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the shape of the silhouette or cross-section of each obtained tampon (1) essentially corresponds to a flattened circle or a rounded square having rounded corner areas, by which the distance (A2) between each two opposite corner areas on the external surface of the tampon (1) is for approx. 10 to 35% greater than the distance (Al) between each two opposite lateral areas on the external surface of the tampon (1).

14. Apparatus according to Claim 13, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the following condition is fulfilled

Tl ≠ T2 and Bl = B2.

15. Apparatus according to Claim 13, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the following condition is fulfilled

Tl ≠ T2 and Bl > B2.

16. Apparatus according to Claim 13, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the following condition is fulfilled

Tl ≠ T2 and BK B2.

17. Method of manufacturing a tampon according to Claims 1 — 12, comprising a sequence of steps, namely preparing a tape-shaped mate consisting of fibrous material of each desired structure, which are compressed or concentrated in any other way into a desired form of mate or vlies or and other non- woven fabric; winding up said tape-shaped mate around the longitudinal axis (100) by simultaneously inserting a string (13) in order to obtain an approximately cylindrical blank (10); radial compression of said blank (10) by means of a pressing device (20) adapted to form appropriate grooves (11, 12, 13, 14, 15, 16, 17, 18) on the circumferential surface of the blank (10) in order to obtain a tampon (1), characterized in that said compression of said blank (10) is performed by means of four pairs of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28), which are directed radially towards the longitudinal axis (100) of the blank (10) and are equidistantly spaced apart from each other around the circumference of said blank (10), where two pairs of pressing jaws (21, 23, 25, 27) having a pre-determined width (Bl) are intended for pressing up to a pre-determined depth (Tl) and are arranged in two planes, which extend perpendicularly with respect to each other and throughout the longitudinal axis (100) of the blank (10), while the other two pairs of pressing jaws (22, 24, 26, 28) having a pre-determined width (B2) are adapted for pressing up to a pre-determined depth (T2) and are arranged in other two planes, which also extend perpendicularly with respect to each other and throughout the longitudinal axis (100) of the blank (10), but are rotated for 45° around said longitudinal axis (100) relatively to said planes of the previously mentioned pressing jaws (21, 23, 25, 27), wherein each width (Bl, B2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the shape of the silhouette or the cross-section of each obtained tampon (1) essentially corresponds to a flattened circle or a rounded square having rounded corner areas, by which the distance (A2) between each two opposite corner areas on the external surface of the tampon (1) is for approx. 10 to 35% greater than the distance (Al) between each two opposite lateral areas on the external surface of the tampon (1).

18. Method according to Claim 17, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the following condition is fulfilled T1 ≠ T2 and Bl = B2.

19. Method according to Claim 17, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the following condition is fulfilled

T1≠T2 andBl>B2.

20. Method according to Claim 17, characterized in that each width (Bl, B2) and each depth (Tl, T2) of pressing jaws (21, 22, 23, 24, 25, 26, 27, 28) is determined in such a manner that the following condition is fulfilled

Tl≠T2andBKB2.