PROCEDURE FOR THE PREPARATION OF MULTI-LAYERED BREAD MATERIAL, CERTAIN OF MULTIPLE LAYERS AND THEIR USE DESCRIPTION OF THE INVENTION The invention relates to a process for the production of multi-layer bristle material consisting of a core that mainly determines the power of bending of the bristle, a layer of coating that determines mainly the effect of brushing and an intermediate layer, where the core is made by extrusion and provided with the intermediate layer of a liquid phase to viscose and on this layer is the continuous material and It is partially embedded in the intermediate layer. The invention relates to bristle material such as that which is used for making brushes for cleaning, polishing or for the application of means, for brushes, interdental cleaners or the like. The effect of a sow, as well as of a bristle application consisting of bristles and / or bristle bundles, depends, on the one hand, on the choice of materials, on the other hand, the constructive processing of the bristle and in particular of the surface of it. The tips of the bristles are essentially important only in cleaning or penetration into interstices, hollow spaces, etc., while the predominant part of the bristle is given by the trunk of the bristle, which is flexed by application of pressure and that REF: 135405
causes a larger or smaller cutting action, even causing a scraping action. Therefore, the structure of the surface of the trunk of the sow is decisive to obtain the desired effect. This recognition has led to multiple bristle constructions. It is thus known (US 4,373,541) to directly structure a sow geometrically. However, the production methods for such bristles are very expensive. Two-component bristles are also known (WO97 / 25902, US Pat. No. 3,698,405), which consist of one or several monofilaments and a layer that covers them. It is also known to twist or twist several monofilaments together to obtain a sow (DE 1 22 88, DE 196 40 853, JP 32 89 906). The processing of such a bristle material is comparatively simple, although it is necessary that the monofilaments be joined together by means of adhesives or other suitable means in order to obtain a stable bond. The final shaping of such bristles is problematic, because they can not be particularly configured in a circular manner, which is necessary for many of the fields of application of the bristle. Finally, bristles and interdental cleaners (DE 37 17 475, US 3 698 405) are known in which a coating layer is applied on a monofilament core and applied to the wet layer.
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fibers. The fibers must be located essentially perpendicular to the surface. Although such bristles can cause novel effects and can also be used to absorb application means, the short fibers have too poor a fixation to the monofilament surface, so that they loose and fall over time. This does not only lead to a decrease in the desired effect, but the fibers that fall on the surface to be treated are not desired. If such bristles are used in the field of hygiene, such as for the care of the mouth and teeth, the fall of fibers leads to highly unpleasant situations. There are also known toothbrush bristles (JP 10 282 122 A) consisting of a nylon core as monofilament and a reinforcing wire placed on its periphery, which either extends along a wrapping line of the core or which It is wound in a circular shape on the core. The thread can also consist of nylon. The thread should reinforce the sows to improve their recovery force and lengthen the life time. On the way of fixing the nylon cord wound circularly, this document does not mention the state of the art. For other bristles for brush coatings, it is known (JP 6 321 680 A) to fix a core made of a multifilament of nylon fibers with abrasive particles included in one or
Two layers with a monofilament of polyamide fibers, this by means of rolling and subsequently fixing it with a glue. In this embodiment, the influence on the brushing effect of the bristles with the fixing glue is not negligible. Since this one, it is placed later. There is no link between the multiple core and the rolled monofilament. Therefore, the monofilament is wound with the coiled monofilaments nearby, to prevent them from slipping into the core. Finally (DE 1 222 888 B) is known, for technical rotation brushes, a monofilament core wound one or several times with a reinforcing monofilament. On the core or on the monofilament, a glue is first applied as an intermediate layer. Multi-stage production is expensive. The adhesion of the monofilament on the core depends on the glue being placed carefully and in a layer with a uniform thickness. The monofilament should only reinforce and protect the core while the brushing effect only depends on the core. The brushing work is clearly a function of the tips of the bristles. The object of the invention is to propose a process for the production of bristle material, from which bristles can be produced whose effect of the trunk is determined by the purpose of application. In addition, a corresponding sow must be created with the invention. Starting from the method according to the main idea of claim 1, this objective is solved because the core and the intermediate layer are co-extruded and after a predetermined traction stretch, in which the intermediate layer has been transformed to a sufficiently solid state , the continuous material is placed on the previously stressed intermediate layer. Contrary to what happens in the case of bristles of three known components, the adhesion promoting intermediate layer, after its application to the core material, which may comprise monofilaments or multifilaments, is initially brought to a dry state and then the layer The continuous material coating is applied to the intermediate layer and in conjunction with the application or thereafter, the continuous material is at least partially incorporated or embedded within the intermediate layer. If the intermediate layer is produced correspondingly soft and plastically deformable, prior tensioning is sufficient to introduce the continuous material into the intermediate layer and hold it there irreversibly. Instead, the intermediate layer can be made of a material that can be reactivated after
its processing. In this case, the continuous material is applied to the dry intermediate layer and optionally no longer deformable. During or after the application of the continuous material the intermediate layer is reactivated and subsequently flies to its solid phase accompanied by the bond of the continuous material. As a result of the reactivation, the intermediate layer becomes smooth, so that the applied continuous material is introduced thereto to a certain degree. The intermediate layer may also have an adhesive action and may comprise, for example, a hot melt adhesive so that the continuous material is bonded to the core by adhesion. It is, however, always ensured that the structure given by the continuous material to the trunk of the bristle is maintained complete - or preponderantly - and that the coating layer formed of continuous material is not separated. It is also possible to apply an intermediate layer of foamed material and foam the intermediate layer following the application of the continuous material, so that the intermediate layer surrounds at least partially the continuous material and in this way it is incorporated into the intermediate layer. It is also possible to obtain a deeper penetration if the intermediate layer comprises a soft or flexible foam which yields correspondingly under the pressure and
exposes the continuous material accordingly. Because the monofilaments for bristles must be stretched in order to give the sow the necessary resistance to bending, in another variant of the method according to the invention, the core together with the intermediate layer are co-extruded and stretched and only then Continuous material is applied. Optionally the core with the intermediate layer and the applied continuous material can then be stretched again. According to another embodiment, it is provided that after application of the continuous material to the intermediate layer, a film is applied, which in the case of profiling pronounced by the continuous material, achieves a smoothing of the profiles. It is also possible to treat the bristle material in an extreme manner after application of the continuous material to the intermediate layer. This can be a mechanical work, a dip or the application of the coating medium. Mechanical work can comprise the longitudinal cutting of the continuous material, at least over partial lengths of the bristle material, in order to release free fiber tips with a corresponding cleaning, polishing or similar action. As a continuous material, a textile material is preferably applied which may have a smooth surface or
a_ rough. In this way, a combination of plastic monofilaments with a textile material on the outside is provided for the first time, which has an adequate adhesion to the intermediate layer. The textile material can be rolled or braided. If an absorbent textile material, such as for example rough yarn or the like, is used, this leads to numerous possibilities of care and cleaning, as well as to the introduction of liquid or very fine powders that can be supplied again during use. The continuous material may also comprise an ultra-fine metal wire or a plastic monofilament with abrasive characteristics. The invention also relates to a multi-layer bristle comprising a core that mainly determines the brushing action and an intermediate layer to promote adhesion. According to the invention, the bristle is characterized in that the coating layer comprises a continuous material wound or bound around the intermediate layer and that the continuous material is at least partially incorporated within the intermediate layer. Preferably, the intermediate layer is made of a softer material than the core which may comprise a polynofilament or multifilament. The intermediate layer can in particular comprise material similar to
i. _ i _i ^ .__ j__t_f_jf ". iy ^. ^ a ^ lt the rubber that allows an incorporation of the continuous material only through the previous tension of the same during the winding. The same applies to an intermediate layer of foamed material. The sow made according to the invention can be used for many different purposes, for example for the application of bristle on brushes or brushes. Alone, it can serve as an interdental cleaner. It can finally be used advantageously for implements, particularly brushes or brushes used to apply very thin liquid or powder which are then embedded in the textile material. The invention is described in greater detail below in relation to embodiments and the accompanying drawings, which show: Fig. 1. a perspective view of a portion of the bristle material in a first embodiment. Fig. 2. A cross section of the bristle material according to fig. 1 Fig. 3 a longitudinal view of the bristle material in another embodiment Fig. 4 a cross section of the bristle material in another embodiment. In the embodiment according to the figure
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1, the bristle material 1 has a core 2 that essentially determines the flexibility of the finished bristle and is formed by one or more plastic monofilaments. An intermediate layer 3 which is preferably made of a softer material is applied to the core 2. A continuous material is applied to the middle layer 4, for example a natural or synthetic textile material which at least on its side facing the intermediate layer is incorporated or embedded therein, so that the continuous material 4 is fixed to the intermediate layer 3. It is naturally possible also to wind several continuous fibers in parallel or transverse form. In the embodiment according to FIG. 3, the bristle material 1 once again has a core and an intermediate layer on which the continuous material 4 is not only wound but also simultaneously linked. As in the case of the bristle material according to Figures 1 and 2, the continuous material can be incorporated into the intermediate layer by corresponding pre-tension. Instead of, or in addition to this, the intermediate layer can be made of a material that arises a change of state through an activation process, for example, by the action of heat and as a result the incorporation of the continuous material is brought to out or is assisted.
The core can have any cross-sectional shape adapted to the purpose of application. An example of embodiment is shown in Figure 4. The bristle material 1 has a roughly rhomboidal core 5 to which an intermediate layer β is applied, which simultaneously fills the convex spaces of the core 5. The aforementioned intermediate layer is then applied, for example, the continuous material is wound or bound. As a result of the profiling of the core 5, a bristle of the bristle material according to Figure 4 has preferred bending directions. As a result of the filling of the convex areas with the intermediate layer, the wear behavior can be influenced. The action of the trunk of the sow sought through the continuous material, is carried out with different intensities on the circumference of the sow. It is noted that in relation to this date, the best method known to the applicant to carry out the aforementioned invention, is that which is clear from the present description of the invention.
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