ES2386459T3 - Toothbrush head as well as procedure for its production - Google Patents

Abstract

A toothbrush head with a plurality of practically elastic tubular-shaped cleaning elements (3) that are attached to a support (2) of cleaning elements and preferably assembled in tufts (5, 6, 7), and in which the cleaning elements (3) protrude from the support (2) of cleaning elements and consist of strips (4) of film, characterized in that at least one applicator substance is introduced into or applied to the strips (4) of film.

Description

Toothbrush head as well as procedure for its production�

The present description refers to a toothbrush head with a plurality of practically tubular shaped elastic cleaning elements which, preferably assembled in tufts, are attached to a support of cleaning elements and protrude therefrom. The present description also refers to a method of producing this toothbrush head.

In conventional toothbrush heads, filaments or, respectively, individual bristles are usually assembled in tufts and attached as bristle tufts to the support of cleaning elements of the toothbrush head. This can be done through a known method to form tufts by anchoring in which the bristles are turned U-shaped so that an anchor plate bends between the arms of the bristles. Thus, the tuft of bristles is introduced into a hole in the support of cleaning elements, in which the anchor plate, which extends over the bristles, sinks into the cavity in such a way that it is anchored by its walls and holds the Bristles in the cavity. As an alternative to this, it has been known to seal the bristles assembled in a wick in the support of cleaning elements, which is molded by plastic injection, in which here the bristle tufts can be introduced with their ends to seal in the mold of injection, such that, with the injection molding of the support of cleaning elements, they are sealed therein.

However, in these conventional toothbrush heads, it is sometimes difficult to provide desired mechanical properties to the bristles or, respectively, to the bristle tufts. For example, it may be desirable to provide bristles (and tufts of bristles formed therewith) with less stiffness in one direction than in the other direction, for example in order to apply greater cleaning forces given in one direction (for example to eliminate tartar), while minor forces should be generated for the cleaning movements given in another direction (for example not to damage the gums and the oral mucosa but rather to gently massage them). The bristle tuft heads can also be adjusted only to a limited number of shapes or, respectively, it may be difficult to get more complex shaped heads of the bristle tufts. Normally the heads of the bristles themselves can only be rounded.

It is known from WO 012013 A1 a toothbrush and a method for producing it in which the filaments that are used as bristles are glued or, respectively, initially fused one after the other in a row with their base segments on a tape. When the tape is wound with the bristles attached to it, a tuft of bristles is generated which is then attached to a bristle holder. Here it is advantageous that, by grouping bristles of different length and / or different hardness, specific properties of the bristle tuft can be achieved as a result. However, in this case it is also difficult to ultimately achieve real specific mechanical properties of the bristle tuft; in particular, the mechanical properties of the bristles themselves may not vary as desired depending on their directional orientation. A toothbrush head is known with the features of the preamble of claim 1 of US-6,336,242 B1.

Based on this basis, the present description is intended to achieve an improved toothbrush head and an improved method for its manufacture that avoids the inconveniences of the state of the art and develops the state of the art in an advantageous manner. In particular, a toothbrush head should be obtained that can be produced in a simple manner, whose cleaning elements and tufts of cleaning elements can easily be provided with desired mechanical properties that vary according to the direction.

According to the present description, this object is achieved through a toothbrush head according to claim 1. With respect to the method, said object is achieved through a method according to claim 20. The preferred embodiments of the invention are the object of the dependent claims.

According to the present description, conventional bristles or filaments that normally use individual plastic fibers are not used as initial form - whose plastic fibers are subsequently shortened to the necessary length of the bristles and assembled in tufts - as cleaning elements. Instead of said bristles or, respectively, filaments with mechanical properties independent of the direction (in the sense of mechanical properties that are equal in all directions transverse to the longitudinal centerline), the present description proposes to use film strips as cleaning elements , whose film strips are produced from a film sheet by means of a deformation method with adequate separation. By a suitable selection of the initial film (in particular its thickness and composition of material) and a suitable selection of the geometry, the desired mechanical properties (in particular directed properties) can be provided to said film strips. In particular, in this way it is possible to simply provide the strips of films with different mechanical properties (such as flexural strength, elastic recovery, recovery force, tilt curve, etc.) in different directions transverse to their longitudinal central line.

In particular, a thin film material can be used as a raw material for the manufacture of the film strips, and a cut can be provided to the film strips such that the individual cleaning elements have a rectangular cross-section whose length is advantageously a multiple of its

width. In particular, a film with a thickness in a range of 10 Im to 500 Im can be used, preferably between about 50 Im and 250 Im - as raw material. The film strips are preferably produced from said film with a strip width corresponding to at least ten times (preferably at least five times) the thickness of the film. For example, filmstrips with a strip width of 1 mm to 5 mm can be produced.

An additional advantage of these cleaning elements that include strips of film (expressing it more precisely, of its rectangular cross-section with a greater ratio of its length to its width) compared to conventional bristles with round cross-section, is that it is best applied the dentffrico to the teeth to be cleaned. While with the bristle tufts made of conventional filaments, the dentifrice abrasive elements are lost relatively soon outside the cleaning area of the bristle tufts due to the convex specific surfaces of the conventional bristles, the flat film strips or, respectively Laminators can keep the dentifrice and its abrasive elements better and for a longer time on the head of the tuft of cleaning elements and thus rub the dentifrice on the dental surfaces to be cleaned, which has an advantageous effect on the removal of tartar.

For the production of the film strips from a film sheet, several deformation methods can be used with separation. According to a preferred embodiment of the present description, the film strips are punched from the film sheet. On the one hand, with this medium high production speeds can be achieved and, on the other hand, the great variety of geometric shapes of the film strips is practically unlimited.

Alternatively or additionally, cutting methods (laser cutting, for example) can be used in the production of film strips. The cuts can be introduced into the initial film with the help of cutting tools and the individual cleaning elements in the form of film strips can be generated in this way from the original adjacent film. The advantage of this method lies in the simple production process; however, with this medium it is not possible to generate structures with arbitrary forms.

In particular, through the aforementioned punching, the most varied forms can be provided to the cleaning elements in their dental surface treatment heads. For example, according to an advantageous embodiment of the present description, the heads of the film strips can have multiple spikes, where the cleaning effect of the individual cleaning elements can be improved in a way that is not negligible since their cleaning effect is derived mainly from their tips .

In another development of the present description, the cleaning elements are produced from a plastic film. In order to better vary the properties of the individual cleaning elements themselves, these can be produced from a multilayer film. In particular, combinations of various materials can also be used here; for example, several layers of plastic can be combined into a film composed of several layers. The cleaning elements can also be advantageously formed from a mixture of plastic and other non-plastic material, in particular from a mixed plastic / paper film (what is known as a plastic / paper mixture). Thanks to the production of the cleaning elements of said plastic / paper mixtures in which the paper ratio can be adjusted in a variable manner, the capacity of the paper to absorb different liquids (especially water) can be used specifically. Due to the superior liquid absorption capacity of the paper, liquid or liquid soluble applicator substances can be introduced into the paper which are released with the application in the mouth. In particular, this gives a better ability to apply chemotherapeutic substances in the place where they should act, that is, directly on the tooth or, respectively, on the brain, for example. In this way, several applicator substances (flavoring agents, antibacterial substances, blood circulation facilitating applicators, etc., for example) can be introduced.

Alternatively or additionally, these applicator substances can also be applied to the film strips by means of a surface coating, which is simpler in the case of films as the initial form of the cleaning elements than with the use of filaments or, respectively, individual bristles .

Basically, the film strips can be individually arranged in the holder of cleaning elements and attached to it. However, the cleaning elements (consisting of strips of film) are preferably assembled in tufts and joined in the form of tufts together in the support of cleaning elements. At least some of the cleaning elements assembled in a tuft are preferably connected to each other by their base, preferably they are designed from one piece forming an integral part of each other, where the cleaning elements are then joined with their base commonly connected to the element support cleaners.

With regard to production, it is especially advantageous here that the strips of films are not cut from the film sheet but rather a series of film strips are placed next to each other, whose film strips are connected by its base by a strip in the form of tape. By folding or, respectively, winding the tape-shaped base of this film section or, respectively, the punctured part with the film strips disposed thereon, a tuft of film strips can be formed which can then be attached to the film. support of cleaning elements, possibly after the combination with film strips or tufts of additional film strips.

In particular, the strands of film strips can be formed such that multiple formations of these strips of film connected by a common base can be stacked on top of one another. A film tuft can be formed by connecting the base segments located one above the other, for example by bonding or heat connection with infrared light or by fusion. It is especially advantageous here that film strips produced from several initial films with different material properties can be stacked on top of one another to specifically control the properties of the film strip tuft. Film strips with different geometries and / or alignments can also be stacked on top of each other to control the mechanical properties of the film strip tuft that is created in this way. For example, alternating film strip formations can be stacked with film strips tilted at an angle to the left on film strip formations with strips of film.

10 film inclined at an angle to the right, such that high rigidity against flexion in both cleaning directions results. Alternatively or additionally, the individual rows of film strips can be arranged with the film strips offset from each other in superimposed rows, whereby a very dense arrangement of cleaning elements is obtained. Similarly, filmstrips of different height and / or different width and / or different thickness can be stacked on top of each other.

The joining of the film strips (in particular combined in tufts of film strips) to the support of cleaning elements can in principle be carried out in several ways. According to an advantageous embodiment of the present description, the film strips can be introduced with their base into a cavity in the support of cleaning elements and thus be anchored by means of an anchoring element that extends transversely through the base segment of the respective strips of film. To do this, the corresponding

The anchoring element can be captured in the support of cleaning elements in such a way that their final segments extend into the walls of the support of cleaning elements surrounding the cavity and fixed theref. This type of bonding can be especially advantageous when using film formations with film strips grouped together next to each other that are integrally connected to each other by their base in a part in the manner mentioned above. Here the respective anchoring element can extend transversely across the

25 tape-shaped base segment of the row of film strips.

As an alternative to the method of tufting and anchoring mentioned above, the film strips can also be joined with a material attached to the support of cleaning elements, in particular it can be sealed therein. The film strips assembled in tufts of film strips can preferably be introduced with their base segments into the corresponding injection mold before the support of cleaning elements 30 is injection molded. The material introduced into the injection mold surrounds the base segments of the film strips so that they are sealed therein. Here it may be especially advantageous for the cavities to be introduced into the base segments of the film strips that must be sealed therein, whose cavities are filled with the foundry material by sealing in the holder of cleaning elements, such that it is also produce a positive connection in addition to the non-positive or, respectively, union of

35 material.

These and other features and additional advantages are also deduced from the present description of the reading of the following specification of the preferred embodiments using the associated drawings, as well as the claims. In the drawings show

Figure 1: a schematic side view of a toothbrush head according to a first embodiment of the present description, which shows the arrangement of the cleaning strips in the form of film strips,

Figure 2: A plan view of the brush head of Figure 1,

Figure 3: a schematic sectional side view of a toothbrush head according to another preferred embodiment of the present description, showing the arrangement of the cleaning elements in the form of film strips,

45 Figure 4: A plan view of the toothbrush head of Figure 3,

Figure 5: a schematic side view of a toothbrush head according to another embodiment of the present description, showing the arrangement of the cleaning strips in the form of film strips,

Figure 6: A plan view of the brush head of Figure 5,

Figure 7: a schematic side view of a toothbrush head according to another embodiment of the present description, which shows the arrangement of the cleaning strips in the form of film strips,

Figure 8: A plan view of the brush head of Figure 7,

Figure 9: a schematic side view of a toothbrush head according to another embodiment of the present description, showing the arrangement of the cleaning strips in the form of film strips,

Figure 10: A plan view of the brush head of Figure 9,

Figure 11: A general perspective view of a toothbrush with cleaning elements in the form of film strips, in which the arrangement of the film strips is designed similar to that of Figure 1,

Figure 12: A perspective representation of a strip of film cut to form a tuft of cleaning elements of a toothbrush according to one of the previous Figures,

Figure 13: a schematic, perspective, enlarged representation of a tuft of cleaning elements formed of multiple rows of film strips stacked on top of each other, and

Figure 14: An enlarged plan view, in section, of a toothbrush head of a preferred embodiment of the present description, showing the arrangement of the individual film strips in the tufts of cleaning elements.

The toothbrush heads 1 shown in the Figures, mainly consist of a support 2 of cleaning elements that can be of injection molded plastic, as well as a plurality of oblong cleaning elements 3, (in general terms) in the form of a brush, which they join together the support 2 of cleaning elements mentioned above and protrude therefrom.

Here, at least a part of the aforementioned cleaning elements 3 consists of strips 4 of film that are attached with their base to the support 2 of cleaning elements and protrude therefrom. The strips 4 of the film are designed to be elastic as a whole; However, due to their geometry and construction material, they are advantageously designed with different mechanical properties in different directions.

The strips 4 of film are assembled in tufts of cleaning elements, similarly as in conventional toothbrushes. In the embodiment according to Figures 1 and 2, a lock 5 of cleaning elements is provided with film strips inclined at an angle towards the toothbrush head, a lock 6 of cleaning elements arranged centrally with film strips protruding perpendicular to the support 2 of cleaning elements and a tuft 7 of cleaning elements with strips of film inclined at an angle back towards the handle 8 of the toothbrush. As Figure 2 shows, a total of four rows of tufts of cleaning elements are provided, wherein in the embodiment depicted in each row 9, 10, 11 and 12 consists of the three groups of tufts of aforementioned cleaning elements inclined at angles different.

The tufts 5, 6 and 7 of cleaning elements consist respectively of strips of film stacked on top of each other. More precisely, each strand 5, 6 and 7 of the film consists of multiple formations 13 of strips of film stacked on top of each other, as shown in Figure 12 by way of example. A plurality of film strips 4 are arranged grouped one after the other and integrally connected to each other in one piece with their base segment 14. The formation 13 of film strips forms a comb, so to speak, from whose segment base 14 protrudes a plurality of strips 4 of film, grouped one after another. These formations 13 of film strips can be produced in particular by punching or cutting a film sheet that serves as a raw material, where several films can be used (for example films composed of several layers including plastic layers and paper layers ) in the manner mentioned above. To form a tuft 5, 6, 6, 7 of bristles, multiple formations 13 of film strips, shown in Figure 12, are stacked on top of each other and connected respectively to each other by their base segment 14. For example, this can be done with a non-positive connection by bonding or as a fusion material joint. Alternatively or additionally, an overlay of the film strips 4 can also be made in which a formation 13 of film strips, as shown in Figure 12, is folded together or rolled up so that multiple strips of film remain one over another. Here, strips 4 of film with an identical geometric shape can be placed coincidentally on one another in several ways, and / or strips of film having a geometrically identical design can be stacked one on top of the other with a deviation in the longitudinal direction of the segment base 14 and / or in the longitudinal direction of the film strips 4, and / or strips 4 of film with a geometrically different design can be stacked on top of each other. It is also possible to stack strips 4 of film with different material properties one on top of the other to establish the mechanical properties of the strand of film strips differently as necessary in different directions.

After the film strips 4 have been stacked on top of each other and connected to each other, they can be attached to the support 2 of cleaning elements in the manner described above, in particular by sealing, insert molding, as well as by a method conventional tuft formation and anchoring thereof.

As in the embodiment shown in Figures 1 and 2, the film strips 4 of each tuft 5, 6 and 7 of film strips are stacked respectively over each other. Although the film strips 4 differ in their tuft alignments of film strips to tuft of film strips, in the same tuft 5, 6 6 7 of film strips the film strips 4 are designed to be geometrically identical and are stack one over the other. As Figure 2 shows, three formations 13 of film strips can be stacked respectively on each other by tuft 5, 6 6 7 of film strips. As Figure 1 shows, strips 4 of

The film can be punctured or cut advantageously by its free ends with two peaks 15 and 16, which can significantly improve the cleaning effect.

In the embodiment according to Figures 3 and 4, all the film strips 4 are combined into a single tuft 5 of film strips, wherein the film strips 4 are also produced here in the manner described above from formations 13 of punched film strips or, respectively, cut that are stacked on top of each other. As Figure 3 and Figure 4 show, however, here the film strips 4 of different geometry are stacked on top of each other with a relative deviation. As Figure 3 shows, the film strips 4 differ in particular in length. In addition, as shown in Figure 4, the film strips 4 are disposed deviated from each other as can be seen in the longitudinal direction of the film strip formations 13.

In the embodiment according to Figures 5 and 6, the tooth brush head 1 includes tufts 5, 6 and 7 of peripheral cleaning elements that respectively form rows 9 and 10 of tufts of cleaning elements (see Figure 6). The tufts 17 of conventional bristles are attached to the support 2 of cleaning elements between these two rows 9 and 10 of tufts of cleaning elements.

In this embodiment, the tufts 5, 6 and 7 of cleaning elements consisting of strips 4 of film are characterized by their different geometry, and possibly by a different material composition. In the tuft 5 of film strips located on the head of the cleaning element holder 2, curved strips of film 4 are arranged which are curved towards the toothbrush head. The tufts 6 of centrally arranged film strips consist of strips 4 of lower width film that protrude perpendicularly (see Figure 5). On the contrary, the film strips 4 arranged towards the handle 8, whose film strips 4 form the tuft 7 of film strips, have a considerably greater width. These are respectively provided additionally with multiple peaks 15, 16.

In the embodiment shown in Figures 7 and 8, the tufts 5 of film strips consisting of strips 4 of film are distributed star-shaped on the support 2 of cleaning elements, in which each tuft 5 of film strips has in general a rectangular cross section. Each strand 5 of film strips is constructed in the manner described above from multiple formations 13 of film strips with strips of film disposed in a row, one after the other, connected by a common base segment 14, whose strip formations 13 of film have been stacked on top of each other. Here, for example, the film strips 4 can be disposed deviated from each other in such a way that a dense arrangement of film strips 4 is created. A tuft 17 of bristles composed of bristles or, respectively, conventional filaments sits at the center of the star-shaped film tuft arrangement. As Figure 7 shows, the cleaning elements 3 formed of film strips 4 may have a length considerably shorter than the tuft 17 of conventional bristles.

By punching the film strips 4 of the plastic or composite film, the film strips 4 can be provided with almost any arbitrary shape, as shown in Figure 9. The tuft 5 of film strips located on the head of the support 2 of cleaning elements consists of strips 4 of film with a contour in the form of saw teeth, while the tuft 6 of strips of film disposed towards the handle 8 is formed by strips 4 of film with strips 4 of film that are approximately shaped in shape of volcano towards the peak. As Figure 10 shows, multiple formations 13 of film strips are also stacked on top of each other.

Claims (32)

one.

A toothbrush head with a plurality of practically elastic tubular-shaped cleaning elements (3) that are attached to a support (2) of cleaning elements and preferably assembled in tufts (5, 6, 7), and in which the cleaning elements (3) protrude from the support (2) of cleaning elements and consist of strips (4) of film, characterized in that at least one applicator substance is introduced into or applied to the strips (4) of film.

2.

The toothbrush head according to the preceding claim, wherein the cleaning elements (3) have a rectangular cross section whose length is a multiple of its width.

3.

The toothbrush head according to any of the preceding claims, wherein the strips (4) of film have a thickness between 10 Im and 500 Im, advantageously between 50 Im and 250 Im.

Four.

The toothbrush head according to any of the preceding claims, wherein the width of the strips

(4) of film is at least ten times, preferably at least fifty times, the thickness of the film strips (4).

5.

The toothbrush head according to any one of the preceding claims, wherein at least one of the cleaning elements (3) is formed of a plastic film.

6.

The toothbrush head according to any of the preceding claims, wherein at least one cleaning element (3) is formed of a mixture of plastic and an additional non-plastic material, in particular of a mixed plastic / paper film.

7.

The toothbrush head according to any one of the preceding claims, wherein at least one cleaning element (3) consists of a film composed of several layers.

8.

The toothbrush head according to any one of the preceding claims, wherein at least one applicator substance, preferably a liquid or liquid soluble applicator substance, is introduced into a paper portion of the film strips (4).

9.

The toothbrush head according to any one of the preceding claims, wherein the strips (4) of film have a surface coating comprising at least one applicator substance.

10.

The toothbrush head according to any of the preceding claims, wherein the cleaning elements (3) have directed mechanical properties, in particular different stiffnesses, recovery forces and / or curvature properties, in different transverse directions.

eleven.

The toothbrush head according to any of the preceding claims, wherein the cleaning elements (3) respectively have multiple peaks (15, 16).

12.

The toothbrush head according to any of the preceding claims, wherein multiple cleaning elements (3) are connected to each other by the base segments (14), preferably are integrally designed with one another in one piece.

13.

The toothbrush head according to any one of the preceding claims, wherein multiple formations (13) of film strips are joined, assembled on a tuft (5, 6, 7) of film strips of multiple film strips (4) respectively connected to each other, to the support (3) of cleaning elements and / or connected to each other by their base segments (14), in particular they are glued and / or fused.

14.

The toothbrush head according to any one of the preceding claims, wherein multiple formations (13) of film strips consisting of strips (4) of film grouped one after another are arranged which are integrally connected to each other in one piece. by their base segments (14) stacked on top of each other, and the superimposed layers of the stack thus formed are connected in a non-positive manner and / or through a union of material with each other by their base segments (14) of the formations (13) of film strips.

fifteen.

The toothbrush head according to any of the preceding claims, wherein the strips (4) of film of different materials and / or different geometry and / or different alignment are combined in a tuft (5, 6, 7) of strips of movie.

16.

The toothbrush head according to any of the preceding claims, wherein cleaning elements are provided consisting of bristles and / or filaments in addition to the cleaning elements (3) made of strips (4) of film.

17. The toothbrush head according to any of the preceding claims, wherein at least some strips (4) of film are introduced into a cavity in the support (2) of cleaning elements and are anchored therefrom by means of an anchoring element that extends transversely through the segments of the film strips (4) that are arranged in the cavity

18.

The toothbrush head according to any one of the preceding claims, wherein at least some of the film strips (4) are sealed with their base segments (14) in the support (2) of cleaning elements.

19.

The toothbrush head according to any of the preceding claims, wherein at least some of the film strips (4) have base segments (14) with recesses that can be filled with the foundry material that forms the support (2) of cleaning elements.

twenty.

A method for producing a toothbrush head (1) according to any of the preceding claims, wherein a plurality of oblong, elastic cleaning elements (3), preferably assembled in tufts, are attached to a support (2) of cleaning elements. , such that the cleaning elements (3) protrude from the support (2) of cleaning elements, in which the strips (4) of film that are separated from at least one film sheet as raw material are used as cleaning elements ( 3), and in which at least some of the strips (4) of film are at least partially punched, characterized in that a surface coating comprising at least one applicator substance is applied to the film sheet before its division into strips (4) of individual films, or at least one applicator substance is introduced into the film sheet, in particular in a paper part of the film sheet, before its division into film strips.

twenty-one.

The method according to the preceding claim, wherein at least some of the film strips (4) are separated from the film sheet at least partially by cutting, in particular laser cutting.

22

The method according to any of the preceding claims, wherein at least one applicator substance is introduced into the film sheet in a paper portion of the film sheet.

2. 3.

The method according to any of the preceding claims, wherein multiple strips (4) of film are stacked on top of each other and attached to the support (2) of cleaning elements such as a lock (5) of cleaning elements.

24.

The method according to the preceding claim, wherein the strips (4) of film assembled in a stack are connected to each other by their base segments (14), in particular they are glued and / or fused.

25.

The method according to any one of the preceding claims, wherein a formation (13) of film strips having multiple strips (4) of film arranged next to each other that are connected to a common base segment (14), of the film sheet.

26.

The method according to any of the preceding claims, wherein a formation (13) of film strips with an adjacent base segment (14) and multiple strips (4) of film of different geometry molded in the adjacent base element is produced.

27.

The method according to one of the two preceding claims, wherein the formation (13) of film strips is folded or rolled into a stack of film strips and then connected to the support (2) of cleaning elements.

28.

The method according to any of the preceding claims, wherein multiple strips (4) of film and / or formations (13) of film strips are stacked on top of each other and joined as a tuft (5, 6, 7) of strips of film to the support (2) of cleaning elements.

29.

The method according to the preceding claim, wherein the formations (13) of strips of films stacked on each other are connected to each other by their base segments (14), in particular they are glued and / or fused.

30

The method according to any one of the preceding claims, in which to join the strips (4) of film to the support (2) of cleaning elements a tuft (5, 6, 7) of film strips is introduced into a cavity in the support (2) of cleaning elements and is anchored therefrom by means of an anchoring element that extends transversely, which extends through a segment of the strips (4) of film that is introduced into the cavity and is anchored in the walls of the cavity.

31.

The method according to any of the preceding claims, wherein the strips (4) of film are joined in a non-positive manner and / or with a material connection to the support (2) of cleaning elements.

32

The method according to the preceding claim, wherein the strips (4) of film are sealed in the support (2) of cleaning elements, in particular they are molded by insertion with the material that forms the support (2) of cleaning elements with the injection molding of the support (2) of cleaning elements.