CN115334936A - Bristle carrier, brush and method of making bristle carrier and brush - Google Patents

Abstract

The invention relates to a bristle carrier (10) for brushes (40; 70), in particular for cosmetic brushes, mascara brushes or interdental brushes, having a carrier body (12) and a bristle insert (14), wherein the The bristle insert ( 14 ) has two wire sections stranded with each other, which in the bristle section ( 24 ) sandwich a large number of bristles between the wire sections, and in the bristle-free section An anchoring segment (26) is then formed in the center, and the carrier body (12) has a receptacle (20) for the anchoring segment (26) which penetrates the carrier body (12) from the front side facing the bristles ) extends to the backside which forms the anchoring surface (22) for the end (28) of the anchoring section (26), wherein the end (28) is embedded in the anchoring surface (22). The invention also relates to a method for producing such a bristle carrier, a brush with such a bristle carrier and a method for producing the brush.

Description

Bristle carrier, brush and method for manufacturing bristle carrier and brush

technical field

The invention relates to a bristle carrier, a method for producing the bristle carrier, a brush with the bristle carrier and a method for producing the brush.

Background technique

Such brushes are filigree brushes, such as cosmetic, mascara or interdental brushes, which have in common that they have a bristle insert whose supporting structure consists of a wire bent in the middle 180°, and the two sections of the wire are twisted together, wherein, along a portion of the wire, a large number of bristles are clamped between the two twisted together wire sections. The part of the wire material with bristles forms a bristle section, and the part without bristles forms an anchor section, and the anchor section is fastened on the carrier body or in the carrier body.

There are various techniques for securing the anchor segment to the carrier body. As is known, the anchoring section is injection molded into the carrier body. The disadvantage of this method is that it is very infrequent, since the carrier body with the built-in bristle inserts must remain in the injection molding tool for a certain period of time until the injected injection molding material has sufficiently cured. Even with a multi-point injection mold with multiple pockets, the operating frequency is lower than that used to manufacture bristle inserts. Therefore, the bristle insert produced must be temporarily stored until it can be connected to the carrier body. Or run the machine making the bristle inserts at a slower than theoretical speed.

It is also known to heat and press the anchoring section into the material of the carrier body in order to anchor the anchoring section in the carrier body after the anchoring section and the material heated by the anchoring section have cooled down again. The disadvantage of this method is also the extremely limited frequency, since the anchoring section takes some time to warm up and then cool down again.

Another method is to provide a receiving groove for the anchoring section in the carrier body, and after the anchoring section has been placed in the receiving groove, the material of the receiving groove is heated to a softening temperature and then pressed from both sides. A high operating frequency is achieved by this method.

However, it turns out that both the receiving groove and the other two methods carry the risk that the bristle inserts will be "screwed out" from the carrier body. The reason is that a good adhesive connection is not formed between the material of the carrier body and the wires of the anchoring section, once the adhesive forces between the wires and the carrier body material are overcome, the anchorage with a bifilar helical shape due to the twisted wires The segments are rotatable as a whole relative to the carrier body.

Contents of the invention

The object of the present invention is to create a brush such as a makeup brush, mascara brush, interdental brush or the like, which can be manufactured at a higher frequency and in which the bristle inserts are reliably anchored to the carrier on the subject. The object of the invention is also to create a method of manufacturing such a brush.

In order to achieve the above objects, according to the invention there is provided a bristle carrier for a brush, in particular for a cosmetic brush, a mascara brush or an interdental brush, the bristle carrier has a carrier body and a bristle insert, wherein the bristle insert has two wire sections twisted to each other, said wire sections sandwiching a mass of bristles between said wire sections in the bristle section and forming an anchor section in the bristle-free section, and the carrier body There is a receptacle for the anchoring section, which extends from the front side facing the bristles through the carrier body to a rear side which forms an anchoring surface for the end of the anchoring section, wherein the end engages the anchoring surface. In order to achieve the above objects, a brush with a holder and such a bristle carrier is also provided. In order to achieve the above object, there is also provided a method for manufacturing such a bristle carrier using the following steps: firstly, a carrier body is provided. The anchoring section is then brought into position such that the end of the anchoring section facing away from the bristles protrudes from the carrier body at the rear. Finally, the anchoring section is embedded into the anchoring surface by means of a sonotrode.

The invention is based on the basic idea of using a bristle carrier of simple construction which is optimized with regard to secure fastening of the bristle insert to the carrier body. The optimization here consists in using the outer, easily accessible surface of the carrier body as the anchoring surface, ie the rear side, regardless of the visual aspect. The exposed anchoring surface may not be visually favorable, but can then be concealed by attaching the carrier body together with the bristle insert in a suitable holder.

"Embedded" here means that the anchoring section formed by the wire is closely connected to the material of the carrier body through the combined action of ultrasonic vibrations and pressure. If the carrier body is made of plastic, the material of the carrier body melts locally under the action of the entrained energy, so that the anchoring section sinks locally into the carrier body. An embedding section is thus formed in which the anchoring section is pressed into the material of the carrier body so deeply that when the material of the carrier body solidifies again, the anchoring section is held in a form-fitting manner. There. Depending on the material of the carrier body, the first carrier body can also be adhesively connected to the anchoring section of the bristle insert. Overall, a connection corresponding to ultrasonic welding is produced. However, even if the carrier body material used is a natural material, especially wood or bamboo, when the anchoring section is pressed against the carrier body by the ultrasonic generator, there will be a gap between the anchoring section and the embedded section formed in the carrier body. A tight connection is created between them, the holding force of which is comparable to the holding force between the anchoring section and the locally fused insert section of the carrier body made of plastic.

According to a technical solution of the present invention, the anchoring surface extends in a direction deviating from the extension direction of the receiving portion by at least 30°. The end of the anchoring section that engages in the anchoring surface also correspondingly extends in a different direction than the rest of the anchoring section of the bristle insert. This then prevents the bristle insert from being completely unscrewed out of the carrier body.

The anchoring surface can preferably extend perpendicular to the direction of extension of the receptacle, so that overall the resulting carrier body has a shorter length.

In this case, the diameter of the receptacle preferably corresponds to the diameter of the anchoring section, so that the bristle insert is introduced into the receptacle seamlessly or with only minimal gaps.

The carrier body can be of one-piece design so that the anchoring section is inserted through the receptacle. Alternatively, it can also be provided that the carrier body is divided into two or more parts, so that the anchoring section is inserted into the receptacle when the carrier body is opened and the carrier body is then closed. The last variant is particularly advantageous when the anchoring section is pre-bent in such a way that the end of the anchoring section protrudes laterally.

According to a preferred embodiment, the carrier body has a sleeve-like form with a retaining flange on the rear side facing away from the bristles. The retaining flange facilitates on the one hand the attachment of the carrier body in the holder. On the other hand, the retaining flange provides sufficient material into which the end of the anchoring section can be reliably embedded.

However, many alternative designs of the carrier body are conceivable. According to a variant, the carrier body has a spherical shape, wherein the rear side facing away from the bristle base can be designed flat, so that an anchoring surface is formed there.

The carrier body may have locking formations that cooperate with complementary locking formations on the retainer. For example, the carrier body may have a heel or shoulder to which a hook lock attached to the retainer may engage. Thereby the carrier body can be easily attached to the holder and replaced with a new carrier body when required.

According to one embodiment of the invention, the carrier body is made of injection-mouldable plastic, so that it can be mass-produced cost-effectively.

Alternatively, the carrier body can also be made of natural materials, especially wood or bamboo, resulting in an environmentally friendly product.

Provision can be made during the production of the bristle carrier that the ends of the anchoring section be bent beforehand by means of a bending tool or also by means of an ultrasonic generator and pressed against the anchoring surface. In this solution, a straight-running anchoring section of the bristle insert can be used, which is pushed into the receptacle of the carrier body.

It can also be provided that the end of the anchoring section is pre-bent before it is pushed into the receptacle. In this case, when the bristle insert is pushed into the carrier body, the end of the anchoring section already extends in an orientation which facilitates embedding into the anchoring surface.

If the carrier body is designed in one piece, the anchoring section is pushed into the receptacle until the end of the anchoring section sticks out at the rear. If, on the other hand, a multipart carrier body is used, the anchoring section can also be inserted into the open carrier body. This facilitates embedding in the anchoring surface of the carrier body in particular when the ends of the anchoring sections have been bent, eg by 90°.

According to a technical solution of the invention, the end of the anchoring section is pressed into a groove on the anchoring surface. This ensures that when the end of the anchoring section engages in the anchoring surface, it no longer protrudes out of the plane of the anchoring surface.

According to an alternative, the end of the anchoring section has grooves melted or burned into the anchoring surface. The advantage of this solution is that the end of the anchoring section does not have to sit in a prefabricated groove, but the end of the anchoring section itself melts or burns the groove. A disadvantage, however, is that more energy is consumed if the ends of the anchoring sections are to be embedded very deeply in the carrier body material.

According to the invention there is also provided a brush in which the bristle carrier is accommodated in the holding section in a form-fitting and non-detachable manner. In particular, this can be achieved in that the bristle carrier is placed in an injection molding tool, into which plastic material is then injected, which plastic material forms the holder. In particular, the holder can be designed from a visual point of view, so that the design of the carrier body, the connection of the end of the anchoring section and the anchoring surface does not have to take into account visual effects; in a finished brush, this area is completely embedded inside the holder.

Preferably, the injection molding tool has a sealing surface which bears against the carrier body, wherein the sealing surface is divided into two parts by a parting surface of the injection molding tool. The special advantage of this design is that the injection mold does not have to be sealed in the region of the wire section of the bristle carrier, but the injection mold can be pressed against the carrier body and sealed there. Thus, wear can thus be avoided if the injection molding tool comes into contact with the metal part (here the wire of the bristle carrier).

Description of drawings

The invention is explained below on the basis of various different embodiments, which are shown in the drawings. In the attached picture:

Figures 1a to 1d show perspective views of a carrier body equipped with bristle inserts in a method according to the invention;

Figures 2a to 2d correspond to the views of Figures 1a to 1d, wherein the carrier body is shown in section;

Figure 3 shows a section along the X-X plane of Figure 1d in a carrier body according to a first embodiment;

FIG. 4 shows a view corresponding to FIG. 3 in a carrier body according to a second embodiment;

Fig. 5 shows a schematic top view of a brush according to a first embodiment, wherein the bristle insert shown in Fig. 1d is used;

Figure 6 shows a cross-sectional view of an injection molding mold used to manufacture a brush according to a second embodiment and employing a bristle carrier according to the invention;

Figure 7 shows a schematic view of a brush manufactured by means of the injection molding mold in Figure 6;

Figure 8 shows a perspective view of a bristle carrier according to an alternative technical solution;

FIG. 9 shows a perspective view of a bristle carrier as a variant of the embodiment of FIG. 8 .

Detailed ways

How to produce a bristle carrier 10 with a carrier body 12 and a bristle insert 14 attached thereto is explained below with reference to FIGS. 1 a to 2 d.

The carrier body 12 has a sleeve-shaped section 16 and a retaining flange 18 which are made in one piece with one another. In the illustrated embodiment, the sleeve-shaped section 16 and the retaining flange 18 each have cylindrical outer surfaces centered on a common central axis, but having different diameters; The diameter is greater than the outer diameter of the sleeve-shaped section 16 .

A receptacle 20 extends centrally through the carrier body 12 , which receptacle 20 is designed as an opening with a constant diameter.

The rear side of the holding flange 18 facing away from the sleeve-shaped section 16 extends in a plane perpendicular to the longitudinal axis of the receptacle 20 . In terms of its function, this back is also called anchoring surface 22 .

The bristle insert 14 is formed from a wire bent in the middle, thus resulting in two sections of equal length. The two segments of equal length are twisted together. In this case, a large number of bristles are inserted in one region between two wire sections twisted together, so that the bristles are clamped between the wire sections. This forms the bristle section 24 . Outside the bristle section 28 there is a bristle-free twisted wire section. A portion of the bristle-free wire section is used to fasten or anchor the bristle insert 14 in the carrier body 12 . This section is then referred to as the anchoring section 26 .

The bristle insert 14 can also consist of two separate wires which are twisted together.

To fasten the bristle insert 14 on the carrier body 12, the anchoring section 26 is pushed into the receptacle 20 of the carrier body 12 (see FIGS. 1a and 2a) until the end 28 of the anchoring section 26 rests on the holding flange The rear side of 18 protrudes from receptacle 20 (see FIGS. 1 b and 2 b ).

The end 28 is then bent by means of a sonotrode 30 (see FIG. 1 b ) so that the end 28 rests flat on the anchoring surface 22 (see FIGS. Indicates an ultrasonic generator).

It is also possible to pre-bend the end 28 by means of a separate tool.

The sonotrode is then activated and pressed against the end 28 of the anchoring section 26 , thereby pressing the end 28 against the anchoring surface 22 .

In the activated state, the sonotrode 30 generates ultrasonic vibrations which are transmitted to the end 28 of the anchoring section 26 . Friction thus arises between the end 28 of the anchoring section 26 and the material of the carrier body 12 . Under the action of the introduced energy and the pressure exerted by the sonotrode (see arrow P in FIGS. 1d and 2d). In this state, the bristle insert 14 is secured securely on the carrier body 12 both in the axial direction and in the circumferential direction.

If the carrier body 12 is made of plastic, the material of the carrier body 12 is locally melted under the action of the energy introduced by the sonotrode, so that the end 28 forms a groove 32 in the anchoring surface into which the end 28 is pressed. The groove 32 is also melted (see FIG. 3 ). In this case, the end 28 can be pressed into the anchoring surface 22 so far that the end 28 does not protrude beyond the plane of the anchoring surface 22 .

If the carrier body 22 is made of wood or bamboo, the ends 28 of the anchoring sections 26 are burnt into the anchoring surface 22 (see FIG. 4 ), so that here also a tight connection is produced between the anchoring section 26 and the anchoring surface 22 .

In the embodiment shown in FIGS. 1a to 2d, the anchoring surface 22 is designed flat, that is to say without prefabricated grooves. It is also possible to provide a groove in the anchoring surface into which the end 28 is pressed before being embedded by the sonotrode.

As an alternative to the embodiment shown, it can be provided that the carrier body 12 is designed in multiple parts. This makes it possible for the bristle insert 14 to be inserted into the receptacle 20 before the two or more parts of the carrier body are attached together and the receptacle is closed. This configuration is particularly advantageous if the anchoring section 26 is prefabricated with the end 28 bent, for example, at a right angle, so that it is not necessary to bend the end region of the anchoring section 26 by means of a sonotrode or another tool. .

FIG. 5 shows a brush 40 with a bristle carrier 10 produced in the manner described above. The brush 40 is especially an interdental brush.

The brush 40 has a holder 42 with a handle section 44 and a receiving section 46 for the bristle carrier 10 .

The receiving section 46 is provided with a positioning shoulder 48 against which the anchoring surface 22 of the carrier body 12 can rest; and a locking formation 50 by means of which the bristle carrier 10 can be detachably and conveniently Replacement means are attached to the holder 42 .

The locking formation 50 may be, for example, a hook lock which engages into the sleeve-shaped section 16 of the carrier body 12 .

Here the holding flange 18 can be fastened between the hook lock and the positioning shoulder 48 in such a way that the bristle carrier 10 is held firmly in the axial direction and the anchoring surface 22 (the end 28 of the anchoring section 26 engages in the anchoring surface 22 Surface 22) is not visible.

FIG. 6 shows an injection molding tool 60 with two mold parts 62 , 64 , by means of which a brush 70 can be produced (see FIG. 7 ). The brush is especially an interdental brush or a mascara brush.

The injection molding tool 60 has a cavity 65 in which the retaining flange 18 of the carrier body 12 and a large part of the sleeve-shaped section 16 are arranged. Only the front of the carrier body 12 facing the bristle section 24 projects out of the cavity 65 . The two mold parts 62 , 64 of the injection molding tool 60 have sealing surfaces 66 which engage the cylindrical outer side of the carrier body 12 and seal there. In this case, the parting surface T of the injection molding tool 60 is in the region of the sealing surface 66 .

As can be seen in FIG. 7 , the holder 42 very cleanly encloses a large part of the carrier body 12 (in particular the retaining flange 18 and the end 28 of the anchoring section 26 which is arranged behind this retaining flange). Only the front end of the sleeve-shaped section 16 of the carrier body 12 is outside the holder 42 . Since the sealing surface 66 can reliably seal against the outer surface of the sleeve-shaped section 16 of the carrier body 12 , there is no risk of unintentional bulging of the injection molding material which forms the holder 42 here.

In this embodiment, it is advantageous that the sonotrode 30 closes the receptacle 20 by compression or melting when pressed against the retaining flange 18 , so that no injection molding material penetrates there, and when the receptacle 30 faces No injection molded material escapes from one side of the bristle insert.

Fig. 8 shows a bristle carrier 10 according to an alternative embodiment. The same reference numerals are used for the features known from the preceding designs, and in this respect reference is made to the above explanations.

The difference between the bristle carrier in FIG. 8 and the bristle carrier known from FIGS. 1 , 2 essentially lies in the basic form of the carrier body. FIG. 8 shows a generally spherical carrier body 12 which is flattened on the back of the carrier body 12 facing away from the bristle insert 14 so that an anchoring surface 22 is formed.

The flattening can also be omitted, so that the anchoring surface 22 is formed by the spherical back of the carrier body 12 .

On the front side facing the bristle insert 14 , the carrier body 12 is provided with a very short sleeve-like extension 16 which can be used as a seat for a sealing surface 66 of the injection molding tool during the injection molding process.

FIG. 9 shows an implementation variant of the embodiment of FIG. 8 . The difference is that the sleeve-like extension 16 is omitted. If the bristle insert 10 is to be overmoulded, the injection mold is sealed on the outer surface of the carrier body 12 .

Claims (21)

1. A bristle carrier (10) for a brush (40; 70), in particular for a cosmetic brush, a mascara brush or an interdental brush, having a carrier body (12) and a bristle insert (14), wherein , the bristle insert (14) has two wire sections twisted to each other, which clamp a large number of bristles between the wire sections in the bristle section (24), and in the bristle-free An anchoring section (26) is then formed in the section, and the carrier body (12) has a receptacle (20) for the anchoring section (26), which passes through from the front facing the bristles The carrier body (12) extends to a rear surface forming an anchoring surface (22) for the end (28) of the anchoring section (26), wherein the end (28) is embedded in the anchoring surface (twenty two). 2. The bristle carrier according to claim 1, characterized in that the anchoring surface (22) extends in a direction deviating from the direction of extension of the receptacle (20) by at least 30°. 3. The bristle carrier according to claim 2, characterized in that the anchoring surface (22) extends perpendicular to the direction of extension of the receptacle (20). 4. The bristle carrier as claimed in claim 1, characterized in that the diameter of the receptacle (20) corresponds to the diameter of the anchoring section (26). 5. The bristle carrier according to any one of the preceding claims, characterized in that the carrier body (12) is of one-piece design. 6. The bristle carrier according to any one of the preceding claims, characterized in that the carrier body (12) has a sleeve-like form with a retaining flange (18) on the rear side facing away from the bristles. 7. The bristle carrier according to any one of claims 1 to 5, characterized in that the carrier body (12) has a spherical shape. 8. The bristle carrier according to any one of the preceding claims, characterized in that the carrier body (12) has a locking configuration. 9. The bristle carrier according to any one of the preceding claims, characterized in that the carrier body (12) is made of injection moldable plastic. 10. The bristle carrier according to any one of claims 1 to 8, characterized in that the carrier body (12) is made of a natural material, in particular wood or bamboo. 11. Brush (40; 70) having a holder (42) and a bristle carrier (10) according to any one of the preceding claims. 12. The brush according to claim 11, characterized in that locking formations (50) are provided, by means of which the bristle carrier (10) is fastened releasably on the holder (42). 13. The brush as claimed in claim 11, characterized in that the bristle carrier (10) is accommodated in the holder (43) in a form-fitting manner and in a non-detachable manner. 14. A method for manufacturing the bristle carrier (10) according to any one of claims 1 to 10, by means of the following steps: - providing a carrier body (12); - placing the anchoring section (26) in the carrier body (12) such that the ends (28) of the anchoring section facing away from the bristles protrude from the carrier body (12) at the back; - Embedding the anchoring section (26) in the anchoring surface (22) by means of a sonotrode (30). 15. The method according to claim 14, characterized in that the end of the anchoring section (26) is bent by means of a bending tool or the sonotrode (30) and pressed against The anchoring surface (22). 16. The method according to claim 14, characterized in that the end (28) of the anchoring section (26) is pre-bent before it is pushed into the receptacle (20). 17. The method as claimed in any one of claims 14 to 16, characterized in that the anchoring section (26) is pushed into the receptacle (20). 18. The method according to any one of claims 14 to 17, characterized in that the end (28) of the anchoring section (26) is pressed into a groove ( 32). 19. A method according to any one of claims 14 to 17, characterized in that the end (28) of the anchoring section (26) melts or burns grooves (32) into the anchoring surface (twenty two). 20. The method for producing the brush according to claim 13, characterized in that the bristle carrier (10) is placed in the injection molding mold (60) and then injected with plastic material which forms the holder (43) . 21. The method according to claim 20, characterized in that the injection molding mold (60) has a sealing surface (66) which rests against the carrier body (12), wherein the sealing surface ( 66) is divided into two parts by the parting surface (T) of said injection molding mold (60).

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