KR20180081098A - Method for mechanically nailing bristles and grinding device - Google Patents

Abstract

The present invention relates to a method for mechanically pointing a bristle for a brush, in particular a toothbrush, by grinding, comprising the steps of: a) measuring, as measured from a fixture, (12) in the syringe holder (18) such that the ratio (L / I) of the free length (L) of the bristle tuft to the length (l) And b) grinding the bristle end (24) at a first free end. The present invention also relates to a grinding device for mechanically nailing a bristle for a brush, wherein the holder comprises at least one bristle holding at different positions of the bristle along its length, In particular a non-clamping position.

Description

Method for mechanically nailing bristles and grinding device

The present invention relates to a method for mechanically pointing bristles and a grinding device for mechanically nailing bristles.

Since various bristles, especially toothbrushes, have an advantageous effect on the cleaning properties of the brush, needle-like bristles are employed.

In order to nail the bristles, on the one hand, bristles are clamped into the holder as a bristle tuft and mechanically napped by the grinding device is known. This method has the disadvantage that, according to the present state of the art, the bristles can only be napped to such an extent that they only meet the requirement regarding the cleaning properties of the brushes.

On the other hand, chemical methods for nailing bristles are known, and the quality of bristle tips can be improved by this method. In this method, the bristle ends are immersed in a strong basic or acidic solution and pulled out of the solution over a period of about 30 minutes. At the point of contact of the bristles with the solution, the surface of the bristles melts and thus leads to a gradually decreasing diameter and thus to a needle-bed nipping.

The disadvantage of the chemical method lies in the environmentally harmful properties of the solution used. Not only does the employee and environment become in danger by the solution, but the equipment is also damaged by corrosion, for example. This leads to a shorter service life of the machine and tool, and thus has drawbacks from an economical point of view.

It is an object of the present invention to provide a method and apparatus for nailing bristles that ensures a high quality bristle tip without the use of chemical solutions which are harmful to the environment.

According to the present invention, this object is achieved by a method for mechanically nailing bristles, in particular bristles for toothbrushes, by grinding,

a) the ratio L / l of the free length L of the bristle tuft to the length l of the conical bristle tip to be produced, as measured from the fixture to the free end to be napped, (12) in the syringe holder (18) so as to be equal to or greater than

b) grinding the bristle end at the first free end

The method comprising the steps of:

During processing, the present invention provides a completely different description as compared to the prior art as to how far the bristles should protrude from the fixture when the bristles have to have a predetermined length of tip tapering conically along them. For example, when the bristles are grinded so that the individual bristles have or have a length of 4 mm, the bristles are arranged so that the free protruding length of the bristles is at least 12 mm at the start of the grinding operation. Respectively. It should be understood that the fastener is the closest to the end of the brushed bristle but is the point of contact with the bristle holder.

This large free length of the bristles proved to be advantageous in the grinding operation, in particular the high quality of the bristle tips being achieved. In the prior art, bristles have always been clamped so that their free length is apparently less than this ratio. In the prior art, the free length of the clamped bristle to be ground is preferably even less than half of the total length. In the prior art, relatively short free lengths have been considered advantageous because they have been considered to improve the position stability of the bristles and the predictability of the grinding operation, which has been regarded as advantageous. However, the present invention ensures that the syringe is more acutely acutely acutely sharpened, especially due to the extreme elasticity of the overly projecting bristle. The bristles accept a conically tapered tip.

This method is also suitable for bristles which are unidirectionally napped and which have bristles fastened in anchorless manner, in particular glued or welded, which are fastened in the brush head by the non-impregnated ends thereof, and also for anchors ) Or for bristle fastening through wire loops.

According to an embodiment of the present invention, the ratio L / l mentioned above is at least 4 and / or not more than 7, in particular not more than 6.5.

In order to grind the other end of the bristle after grinding the first end and to nail the bristles, the present invention includes the following additional steps:

c) for the second free end not yet ground, changing the position of the bristle holder in the syringe holder such that the same ratio is set as set to nail the pre-needled end, and

d) grinding the bristle end at the second free end

Lt; / RTI >

In the abovementioned step a), another embodiment of the method according to the invention is characterized in that the free length of the bristle from the fixture to the free first end to be napped is at least 12 mm and / or 40% of the total length of the non- Lt; RTI ID = 0.0 > closure < / RTI > within the syringe holder.

In a preferred embodiment, the improved method comprises after step b) the following additional steps:

e) changing the position of the bristle tuft in the syringe holder such that the free length of the bristle from the fixture to the free opposite end of the bristle tuft is at least 12 mm and / or more than 40% of the total length of the bristlebrush; And

f) grinding the bristle end at the second free end

.

The bristles are thereby napped at both ends of the bristles, whereby by changing the position of the bristles in the bristle holder, a large free length of the bristles is achieved which is particularly necessary to ensure a high quality bristle tip.

A method for bi-directionally nipping bristles is particularly suitable for brushes in which the bristles are folded and fastened within the brush head by a metal anchor or wire loop.

Preferably, these bristles are used in a small brush, particularly a toothbrush, whose bristles protrude from the brush about 10 mm to 15 mm.

In the method, after step b) and before step d), the sake holder is rotated by 180 ° about an axis orthogonal to the longitudinal direction of the clamped bristles, in order to guide the bristle end on the other side of the sieve holder to a position for machining Can be provided.

Preferably, the non-abrasive bristle sheath has a length of 26 mm to 32 mm, whereby the characteristic is ideally suited to a toothbrush having a folded bristle.

In another solution, the invention further provides a method for mechanically nailing bristles, particularly bristles for a toothbrush, by grinding bristles on the grinding surface of a rotating tool, wherein during the grinding process in progress, And the relative speed between the grinding surface and the bristle tuft is gradually reduced in the process. This solution can of course also be combined with the above-mentioned solution.

The idea of this background is that the tips of the bristles are first napped at high grinding speeds. Thereafter, the bristles are further advanced in the direction of the grinding surface, so that an increasingly larger portion of the bristle ends can come into contact with the grinding surface. Thus, the bristle ends are further ground over an increasingly increasing axial portion. However, in the process, the grinding speed (the relative velocity between the bristle and the grinding surface) also decreases more and more, and the progress of the addition of bristles in the direction of the grinding surface and the reduction of the grinding speed can still be affected. The grinding quality is thereby greatly improved, as was found in the extensive test series. In addition, it is now possible, for example, to mechanically grind bristles made of materials which have been regarded as so far as mechanically non-nontackable bristles made of nylon or PBT. This is achieved in that the grinding speed is reduced when the bristles are placed on the grinding surface along a relatively large length and the friction is thereby increased. As a result, a small amount of frictional heat is generated. The bristles are no longer close to the critical melting temperature. Moreover, the maximum removal of the material is somehow necessary at the end of the bristles, and at this point a large part of the required removal of the material has already been done at the start of the grinding operation. In the method according to the invention, the grinding surface performs a relative movement in space. The bristles are similarly rotated during grinding by the rotating drill holder.

For grinding purposes, one or more grinding rollers are used in advantageous embodiments, which preferably have a cylindrical or conical sheath face on which the grinding process is carried out. The curved surface of the grinding roller has a favorable effect on the quality of the bristle tip. It is of course also possible to design a grinding roller having any shape of a rotationally symmetrical sheath face, but it is not absolutely necessary to use a cylindrical or conical shape.

During grinding, the syringe holder is rotatable about an axis of rotation parallel to the longitudinal direction of the clamped bristles, and is positioned at an angle of at least 80 with respect to the axis of rotation of the grinding roller. This relative movement facilitates needle-bedding of the bristles.

Preferably, during the grinding process, the syringe holder is moved along the skin surface substantially in the longitudinal direction. The advancing direction of the syringe holder is not parallel to the rotational axis of the grinding roller in particular. Additionally or alternatively, the distance of the sieve holder to the shell surface and / or the axis of rotation is gradually reduced during travel. This arrangement of bristles with respect to the grinding roller has an adequate effect on the needling of the ends of the bristles, since they become increasingly needle-shaped over a larger length.

In an advantageous embodiment, the ratio (R / r) of the radius of the grinding roller to the distance of the clamped bristles spaced farthest from the axis of rotation of the syringe holder from the axis of rotation in this embodiment, , 1 to 4, especially 1 to 3, wherein all the bristles of the sake holder lie within the outer edge forming the shell surface. This ratio has a favorable effect on the quality of the bristle tip.

The syringe holder is preferably moved close to the surface of the polishing body so that the furthest bristle is placed on the polishing body over its entire rotation path. In particular, at a sake length of 26 mm to 32 mm, the minimum distance from the fixture in the sake holder to the grinding surface is in the range of 5 mm to 12 mm. It should be ensured here that all bristles are brought into contact with the abrasive article and needle-punched. However, it is of course possible that the individual bristles are temporarily placed on top of each other, so that not all the bristles continue to contact the bristle.

According to the present invention, a grinding device is also provided for a solution of the above-mentioned object. This grinding device for mechanically nailing a bristle, especially a bristle for a toothbrush, comprises at least one receptacle for bristles and at least one grinding body having a grinding surface. The syringe holder is configured with a retention unit that allows clamping of at least one bristle and a shift of the bristle at the non-clamping position of the syringe holder relative to the syringe holder at different locations of the bristle along that length. The sake holder serves as a tool and does not form part of the finished brush head thereafter. By means of its retaining unit, the sake holder provides for setting the free length of the bristles, which is particularly necessary for achieving high quality bristle tips. Moreover, the sake holder allows grinding at both free ends, since the excess projecting length is not allowed to simply swing in the male holder, so that the squeeze must be reclamped for this purpose. Next, the free length of the ungrafted liquor will not reach the free minimum length according to the present invention.

Preferably, the free length of the bristles from the fixture to the free end to be napped is at least 12 mm and / or more than 40% of the total length of the unmasked bristle. Thus, the required free length of the bristles is guaranteed for high quality bristles.

In an advantageous embodiment, the sake holder has a plurality of receptacles for a plurality of bristle tufts that can be co-ordinated in this manner.

The retaining unit preferably comprises at least one resilient element arranged between the pressure element and the pressure element. The resilient element can enclose the bristle-receiving opening and reduce the cross-section of the receiving opening by compression to maintain the bristle within the receptacle. This configuration provides a compact design and easy control of the retaining unit. The elastic element can be designed, for example, as a layer having a plurality of lead-through receiving openings or in the form of an O-ring. When an O-ring is provided, the O-ring must, of course, be present on each receptacle.

To nip two opposing bristle ends, the syringe holder may be rotated 180 degrees about an axis orthogonal to the longitudinal direction of the clamped bristles to nip both ends.

In an advantageous embodiment, the abrasive is preferably a grinding roller having a shell surface configured as a cylindrical or conical shaped abrasive surface. The curved surface of the grinding roller has a favorable effect on the quality of the bristle tip.

During grinding, the syringe holder can rotate around a rotational axis parallel to the longitudinal direction of the clamped bristles, and is positioned at an angle of at least 80 with respect to the rotational axis of the grinding roller. Due to this relative movement, the ends of the bristles are appropriately napped.

Preferably, the sake holder is mounted movably in a substantially longitudinal direction along the shell surface. The direction of the advancement of the sushi holder is not parallel to the axis of rotation of the grinding roller in particular and / or the distance of the sushi holder to the shell surface and / or the axis of rotation is gradually reduced during the movement. As mentioned, this results in an increase in the amount of bristles contacting the polishing body as the path of travel increases, and the bristles are thus processed more and more, which in turn has a beneficial effect on the needle-ashing of the bristles.

According to a preferred embodiment, the ratio (R / r) of the radius of the grinding roller to the distance of the clamped bristles spaced farthest from the axis of rotation of the sushi holder from the axis of rotation is approximately 1 to 4, in particular 1 to 3. Viewed in the direction of the axis of rotation of the syringe holder, in particular all of the bristles of the syringe holder lie within the outer edge forming a sheath surface in plan view. In this design, it is ensured that all bristle ends are uniformly machined and fairly well-formed after the grinding operation.

Other advantages and features may be taken from the following description, taken in conjunction with the accompanying drawings, in which:
1 shows in a side view the sequence of the invention for the step of nipping the bristles in both directions in a grinding device according to the invention,
2 is a perspective view of the filling of the holder from the magazine to the bristle,
3 is a perspective view showing a grinding operation of the bristle holder of the syringe holder on the grinding roller,
- Figure 4 shows the grinding operation of Figure 3 in side view,
- Figure 5 shows a side view of a variant of a grinding device according to the invention with a conical polishing body,
- Figure 6 shows three different steps when grinding a number of bristles,
7 shows a bristle in which the needle-like ends are divided into different parts,
8 is a view showing the relationship between the advancing depth of the polishing body and the rotational speed,
9 shows a side view of a bristle brace clamped in a syringe holder,
- Figures 10a) and 10b) show, in cross-sectional view, the receptacle of the sake holder in the open and closed positions, respectively.

Fig. 1 shows a procedure for nipping the bristles, particularly bristles for a toothbrush, in both directions by using the grinding device 10 in five steps.

The bristles 12 are removed from the magazine 16 by the syringe separator 14 and guided to a position above the syringe holder 18 and held in the syringe holder 18 by the squeezer 20, .

In the second step, the bristle cloth 12 clamped in the syringe holder 18 is moved over the polishing body 22 and is napped at its side to be brought into contact with the polishing body 22.

In the subsequent third stage, the syringe holder 18 is rotated by 180 degrees.

In a fourth step, a grinding process is carried out which proceeds similarly to the second step, in which the facing bristle tufts 24 are napped.

In the fifth and concurrently final stages, the bristle tufts 12, which are napped in both directions, are discharged from the syringe holder 18 into the bristle container 26.

FIG. 2 is a perspective view of the first step of FIG. 1. FIG. A bristle sheath 12 having a length of about 26 mm to 32 mm (corresponding to the bristle length) and a diameter of about 1.5 mm to 3 mm is removed from the magazine 16 by the sorter separator 14, And is pressed into the receptacle 28 of the syringe holder 18 by the squeezing device 20. The bristle sheath 12 has a relatively large free length (as measured from the retention point at the end to be machined in a subsequent step, more precisely from the retention point of the fastener closest to the end to be needle- L). During grinding, a conically tapered tip is created in each bristle (see Fig. 7), which has a length l. This length l is structurally characterized. The bristle sheath 12 is now set so that the free end to be machined to achieve a ratio L / I of 3 or more, in particular 4 or more, is correspondingly projected with respect to the fastener.

Alternatively, an upper limit, i.e., 7 or less, especially 6.5 or less, may also be provided.

One option consists in that the bristle sheath 12 is clamped such that the free length of the end to be worked is at least 12 mm or more than 40% of the total length of the fine grinding bristles 12 with respect to the fastener.

FIGS. 3 and 4 are perspective views illustrating the second step of FIG. 1. FIG. The clamped bristle tuft 12 held in the syringe holder 18 is moved through the rotary polishing body 22 which in the present embodiment has its cylindrical or conical shell face 30, (Grinding surface) on which the grinding process is performed. During this movement, the syringe holder 18 rotates about the rotational axis A parallel to the longitudinal direction of the additionally clamped bristle 12. The syringe holder is moved in a plan view along a linear path B parallel to or coinciding with the rotation axis X of the grinding roller. It can be seen from the side view (see FIG. 4), however, that path B extends slightly at an angle α with respect to the grinding surface, ie the shell surface 30, ie 2 to 10 °. This means that during the movement of the syringe holder 18 along the grinding process and the grinding surface, the syringe holder 18 and the bristles gradually advance towards the axis of rotation X, or in other words towards the shell surface 30. Thus, more axial portions of the bristles are ground. As in the embodiment of Fig. 4, the polishing body has a cylindrical shell surface 30, and the angle alpha is also between the shell surface 30 and the rotation axis X. [

Wherein the minimum distance a of the fastener in the syringe holder 18 to the grinding surface is in the range of 5 mm to 10 mm.

Alternatively or additionally the distance of the sieve holder 18 to the polishing body 22 may be adjusted such that the distance between the sieve holder 18 and the surface of the polishing body 22 is reduced, Lt; RTI ID = 0.0 > conical < / RTI >

The ratio (R / r) of the radius of the grinding roller to the distance of the held bristles 12 farthest from the rotation axis A of the syringe holder 18 from the rotation axis A in this embodiment is 1 to 4, but may also be 1 to 3.

In the direction of the rotational axis A of the syringe holder 18 all the bristles 12 of the syringe holder 18 additionally lie within the line outer edge 40 of the grinding roller, Thereby forming a surface.

In this embodiment, the cone angle? Of the polishing body 22 is also shown.

Due to the fact that during the linear movement along the path B the sieve holder 18 advances from the end of the polishing body 22 having a larger diameter R to the end with a smaller diameter, The surface starts at the portion of the polishing body 22 which has a greater circumferential velocity than at the end having the smaller diameter.

As can be clearly seen in Fig. 5, only the end of the bristles is first ground, and this grinding process is performed at a high grinding speed. Thereafter, the distance of the syringe holder 18 to the grinding surface is further reduced, i.e. the bristles are gradually advanced to the grinding surface. At the same time, however, the circumferential velocity of the polishing body 22 is reduced. As a result, the amount of heat introduced into the bristles by friction is reduced.

The idea of advancing the individual bristles gradually on the grinding surface during the grinding operation, while at the same time reducing the grinding speed can also be realized in other ways as also shown in Fig.

Fig. 6 shows five sake holders 18 which accommodate a number of bristles 12 and which rotate the bristle around its axis A, one of which is arranged next to the other. 6, the distance T3 of the syringe holder 18 to the rotation axis R is still relatively large, so that only the axial end of the bristles is ground. However, since the polishing body 22 rotates at a high speed in accordance with the rotation number n1, the grinding speed is relatively high. Incrementally or continuously, the rotation speed and the rotation number are then reduced from n2 to n1, and at the same time the distance of the sieve holder 18 to the rotation axis R is reduced to T1 via T2.

6, the syringe holder 18 is not moved along the path B extending transversely to the rotational axis A, but is rotated and advanced only in the direction of its rotational axis A, Represents path (B). Of course, the rollers can also be reversely advanced in the direction of the sake holder.

Figure 7 shows which of the future finished bristle tips differed at what speed and at which distance they are produced.

Fig. 8 shows the various progresses of the change in the speed with respect to the variation of the distance along which the grinding process is performed. Figs. 4 and 5 illustrate the pre-unidirectionally napped bristles at the second end. Symbolically, bristles are shown as tapered. Actually, the bristle brush has an outer shape as shown in an enlarged view on the lower left side of Fig. 9, wherein the individual bristles themselves are shown as being napped.

FIG. 9 is a side view of the third step of FIG. To grind another bristle end 24, the bristle holder 18 is rotated 180 degrees about an axis orthogonal to the longitudinal direction of the clamped bristle 12. In addition, the bristle sheath 12 can be removed from the retainer 18 after the sake holder 18 has been held, for example, from a clamping position (Fig. 10b)) to a non-retained, e.g., non-clamping position For example, axially within the syringe holder 18 (see arrows in Fig. 9) by the pusher 20. As a result, at the end which is not yet napped, the bristle 12 has a free length L of at least 12 mm or more than 40% of the total length of the micro-grinding bristle 12.

More generally, the ratio (L / I) of the free length (L) to the length (l) of the conically tapered tip to be produced is 3 or more, especially 4 or more. This means that the corresponding ratio L / l is also set when grinding the second end of the bristle sheath 12 so that the two ends have the same tip shape and tip length of the bristles.

As an upper limit, a value of 6 or 5 may be advantageous as a ratio L / l.

Figures 10a and 10b illustrate a syringe holder 18 having two receptacles 28 and a retaining unit 32 respectively arranged within the syringe holder 18, 12 can be fastened at different points along its length and the shift of the bristle sheath 12 relative to the syringe holder 18 is possible at the non-clamping position of the syringe holder 18.

10 a) shows a state in which the two plate-shaped pressure elements 34 are in the open, spaced apart position and the interposed elastic element 36 in the form of an O-ring is in an unclamped position, Respectively.

10b) shows the closed position of the retaining unit 32 in the closed position in which the two pressure elements 34 approach each other and in which the interposed elastic element 36 is in the clamping squeezed position. In this position, the receiving opening surrounding the bristle sheath 12 is reduced in cross section by compression of the resilient element 36 and thus clamps the bristle sheath 12 within the receptacle 28.

In order to carry out the method according to the invention, it is necessary that the bristle bolt should be long-shifted in the sluice holder, as shown in Figs. 9 and 10, i.e. to be reclamped when the other end is to be needle- It is not absolutely necessary. It is also possible to grind both ends in the same setup.

In the application in which the bristle tuft maintains the brush body in an unbonded state, i. E. Without an anchor, only one end of the bristles has to be needle-punched. However, since these bristles are extremely short, they can not be mechanically napped without trimming. The solution to this problem consists in using long-time bristles, the bristles being napped at both ends as described above, and then being cut at the middle.

10: grinding device 12: bristles
14: sake separator 16: magazine
18: sake holder 20: squeezer
22: polishing body 24: bristles
26: bristle container 28: receptacle
30: shell face 32: retaining unit
34: pressure element 36: elastic element

Claims (26)

A method for mechanically pointing a bristle, particularly a bristle for a toothbrush, by grinding,
a) the ratio L / l of the free length L of the bristle tuft to the length l of the conical bristle tip to be produced, as measured from the fixture to the free end to be napped, (12) in the syringe holder (18) so as to be equal to or greater than
b) grinding the bristle end (24) at the first free end
≪ / RTI > The method according to claim 1, wherein said ratio (L / l) is 4 or more and / or said ratio (L / l) is 7 or less, in particular 6.5 or less. 3. The method according to claim 1 or 2, wherein, following step b), the method further comprises the following additional steps:
c) for the second free end which has not yet been ground, so that the same ratio (L / l) of the bristles 12 in the sieve holder 18 is set as set to nail the pre- Changing the position, and
d) grinding the bristle end (24) at the second free end
≪ / RTI > 4. The method according to any one of claims 1 to 3, wherein in step b), the free length (L) of the bristle sheath (12) as measured from the fastener to the free first end to be napped is at least 12 mm and / or more than 40% of the total length of the non-abrasive bristle sheath (12). 5. The method of claim 4 wherein, following step b), the method further comprises the following additional steps:
a) the free length (L) of the bristle sheath (12) from the fastener to the free opposite end of the bristle sheath (12) is at least 12 mm and / Changing the position of the bristle sheath (12) in the syringe holder (18), And
b) grinding the bristle end (24) at the second free end
≪ / RTI > Method according to claim 3 or 5, characterized in that after step b) and before step d), the syringe holder (18) is rotated 180 ° about an axis orthogonal to the longitudinal direction of the clamped bristle ≪ / RTI > 7. A method according to any one of claims 1 to 6, characterized in that the microgrinding bristles (12) have a length of between 26 mm and 32 mm. A method according to any one of claims 1 to 7 for mechanically nailing bristles, especially bristles for toothbrushes, by grinding bristles on the grinding surface of a rotating tool, characterized in that during the grinding process, Characterized in that the drill (12) advances in the direction of the tool side grinding surface and in the process the relative speed between the grinding surface and the bristle (12) is gradually reduced. 9. A method according to any one of claims 1 to 8, characterized in that at least one grinding roller is used for grinding, said grinding roller having a preferably cylindrical or conical sheath face (30) on which the grinding process is carried out How to. The method according to claim 9, characterized in that during grinding, the sieve holder (18) rotates about the rotational axis (A). 11. A method as claimed in claim 10, characterized in that the axis is parallel to the longitudinal direction of the clamped bristles (12) and is located at an angle (?) Of at least 80 degrees with respect to the axis of rotation (X) of the grinding roller. 12. A method according to any one of claims 9 to 11, characterized in that during the grinding process, the sieve holder (18) is moved substantially longitudinally along the shell surface (30). 13. The method according to any one of claims 1 to 12, wherein the advancing direction of the syringe holder (18) is parallel to the axis of rotation (X) of the grinding roller and / The distance (a) of the holder (18) is gradually reduced during movement. Method according to any one of claims 9 to 13, characterized in that the ratio of the radius of the grinding roller to the distance of the clamped bristles (12) farthest from the axis of rotation (A) of the syringe holder RTI ID = 0.0 > R / r) < / RTI > 15. A method according to any one of claims 1 to 14, wherein at least one grinding roller is used for grinding, said grinding roller having a shell surface (30) on which a grinding process is carried out, Characterized in that all of the bristles (12) of the syringe holder (18) lie within the outer edge of the grinding roller forming the shell surface when viewed in the direction of the rotational axis (A). 16. The polishing apparatus according to any one of claims 1 to 15, wherein the syringe holder (18) is arranged on the surface of the polishing body (22) so that the bristles farthest from each other are placed on the polishing body (22) Characterized in that the minimum distance (a) of the fixture in the sieve holder (18) to the grinding surface is in the range of 5 mm to 12 mm, particularly in the range of 26 mm to 32 mm. . A brush, particularly a bristle for a toothbrush, comprising at least one syringe holder (18) having at least one receptacle (28) for a bristle liner (12) and at least one polishing body Wherein the grinding device (10)
The syringe holder 18 is adapted to maintain the at least one bristle 12 at a different position of the bristle 12 along its length and in particular to maintain the clamping and clamping of the bristle holder 12 relative to the syringe holder 18. [ Wherein the retaining unit (32) is configured to have a retaining unit (32) that permits non-retaining, particularly shifting of the bristles (12) at the non-clamping position. 18. The method of claim 17, wherein the free length (L) of the bristles (12) from the fixture to the free first end to be napped is at least 12 mm and / Of the grinding device. 19. A grinding device according to claim 17 or 18, characterized in that the syringe holder (18) has a plurality of receptacles (28) for a plurality of bristles (12) that are nested in the cavity. 20. A device according to any one of claims 17 to 19, wherein said holding unit (32) comprises at least one resilient element (36) arranged between a pressure element (34) and a pressure element (34) The element 36 surrounds the receiving aperture for the bristle 12 and is configured to receive the cross section of the receiving opening by compression of the resilient element 36 to retain or clamp the bristle 12 within the receptacle 28. [ Wherein the grinding device is a grinding device. 21. A method as claimed in any one of claims 17 to 20, characterized in that in order to nip all of the opposite bristle ends (24), the syringe holder (18) Gt; 180 < / RTI > 22. A method according to any one of claims 17 to 21, characterized in that said grinding body (22) is a grinding roller having a shell face (30) which is preferably constituted as a cylindrical or conical shaped grinding face device. 24. A grinding device according to any one of claims 17 to 22, wherein during the grinding, the sieve holder (18) rotates about the rotational axis (A). The grinding device according to claim 23, wherein the rotary shaft (A) is parallel to the longitudinal direction of the clamped bristles and is located at an angle (?) Of at least 80 ° with respect to the rotation axis (X) of the grinding roller. 25. A grinding device according to any one of claims 17 to 24, wherein the sieve holder (18) is mounted so as to be movable in a substantially longitudinal direction along the shell surface (30). 26. Apparatus according to claim 25, characterized in that the direction of travel of the syringe holder (18) is parallel to the axis of rotation (X) of the grinding roller and / ) Is gradually reduced during travel.

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