WO2019145114A1

WO2019145114A1 - Filament and toothbrush with at least one corresponding filament

Info

Publication number: WO2019145114A1
Application number: PCT/EP2019/000019
Authority: WO
Inventors: Hans-Ulrich Pusch
Original assignee: Pedex Gmbh
Priority date: 2018-01-29
Filing date: 2019-01-24
Publication date: 2019-08-01
Also published as: EP3745911A1; DE102018000663A1; MX2020007848A; CN111770703A

Abstract

The invention relates to a filament having a main body composed of a first plastic material. The main body extends along a longitudinal axis, wherein its cross section has a radially inner base section and a plurality of projections which protrude radially to the outside from the base section. The projections are integrally formed with the base section. In this case, provision is made for at least one of the projections to be fitted with a head part at its radially outer end. The head part is composed of a second plastic material which is different from the first plastic material of the main body.

Description

Filament and toothbrush with at least one

corresponding filament

The invention relates to a filament having a base body made of a first plastic material, which extends along egg ner longitudinal axis, wherein the cross section of the base body has a radial inner base portion and a plurality of the base portion radially outwardly projecting protrusions integrally with the base portion are formed.

Furthermore, the invention relates to a toothbrush with at least one such filament.

Axial in the context of this application is a direction parallel to the longitudinal axis of the main body of the filament. A radial direction is perpendicular to the longitudinal axis of the main body of the filament and is based on the center of the cross-section of the body.

From the prior art are generic filaments be known, in which the base portion of the cross section has four radially outwardly projecting projections which are net angeord in the circumferential direction of the base portion and thus form a kind of star profile. All pros Jumps have the same radial distance to the center point of the cross section. The region between two adjacent projections along the circumferential direction of the cross section is provided with a curved, continuous transition.

The known filaments have an only average cleaning effect when brushing teeth.

It is therefore the object of the invention to further develop the generic filament and the generic toothbrush such that a filament with improved cleaning effect is created.

The object is achieved by a filament with the Merkma len of claim 1 and with a toothbrush with which he inventive filament according to claim 15.

The filament according to the invention is characterized in that at least one of the projections carries at its radial externa ßeren end a head part, which consists of a second plastic material, which is different from the first plastic material of the body.

The invention is based on the basic idea that the projection provided with the head part has a greater radii length than a köpfteilfreier projection. As a result, the area between two adjacent projections to the acquisition of toothpaste is increased. With the choice of the second plastic material, the cleaning effect of the projection and thus of the entire filament can be improved, especially when brushing teeth. Preferably, the protrusions are formed along the entire length of the filament so that the protrusions form along radially extending ribs extending in the longitudinal direction of the filament. This increases the area for receiving toothpaste and thus the cleaning effect when brushing teeth.

In order to further enlarge the area for receiving toothpaste, at least six projections, in particular at least eight projections, may be provided. The projections may be uniformly distributed over the circumference of the cross section of the base portion.

Preferably, the projections are point-symmetrical with the center point of the cross section of the base portion arranged, which corresponds to a particularly simple arrangement. Most preferably, a plurality of projections each have a head portion to ßern the area for receiving toothpaste to magnification.

In a further development of the invention projections in the circumferential direction of the base portion with headboards and headless projections are arranged alternately, which corresponds to a regular structure of the filament. Alternatively, each projection may have a head part, so that the area for receiving toothpaste increases and thus the cleaning effect when brushing teeth is improved.

The head part can be at least positively and / or cohesively connected to the projection. For example, the head part can be welded and / or glued to the projection. In particular, the head part can be attached to the projection by means of an undercut, wherein For example, engages a radially inwardly facing engagement part of the head part in a recess provided with an undercut recess of the projection. Alternatively, however, the projection may have a radially outwardly facing A handle part which engages in a recess provided with a Hinterschnei recess of the head part. In addition or alternatively, the head part can be arranged cohesively on the projection and in particular be welded to these ver.

For a particularly efficient enlargement of the area for receiving toothpaste, the radial vertex of the head part may project radially beyond the radial vertexes of the projections, i. in that the projections which carry a head part have a greater radial distance to the center of the cross section than the headless projections.

For the purposes of the invention, the radial distance is defined as the distance to the center of the cross section of the Grundkör pers, which usually coincides with the longitudinal axis of the filament.

The radial distance of the radial vertex of the head part-free projection may be 50 pm to 150 pm, in particular 75 pm to 125 pm and for example about 100 pm. The radial vertex of the projection in the sense of He-making is that point of the projection with the largest ra-media distance. Preferably, the radial vertex point of the head portion projects beyond the projection of the radial vertex point of the headless projection by 10 pm to 30 pm, in particular by about 20 pm. In preferred embodiments of the invention, the ratio of the difference of the radial distances of the head part from a headless projection to the radial length of the headless projection between 5% and 20%, in particular 5% to 15% and preferably about 10%.

Preferably, the first plastic material of the base body is a thermoplastic polyester, in particular PBT (polybutylene terephthalate). This material has due to its Shore hardness sufficient rigidity to be used in toothbrushes. The second plastic material of the head part may be a thermoplastic material with in particular a lower Sho re-hardness than the first plastic material, example, a thermoplastic elastomer. In contact with the tooth, the material has a good cleaning effect when brushing teeth.

Preferably, all head parts consist of the same two th plastic material, so that the filament is particularly easy to manufacture.

Preferably, at least one head part of a third thermoplastic material, which is different to the first and the second plastic material ver. In particular, a group of head parts made of the second thermoplastic material and a further group of headboards may consist of the third plastic material. The third thermoplastic material may have a lower Shore hardness than the first plastic material. The choice of different plastic materials for the head parts allows an optimization of the cleaning effect when brushing teeth.

The filament may be twisted around its longitudinal axis, so that the projections and the head part along the longitudinal axis tion of the filament are arranged helically. The Fila ment can have a twist of 100 U / m (revolutions per meter) to 300 U / m, in particular 200 U / m to 170 U / m, in particular about 150 U / m. Due to the helical arrangement toothpaste is better kept between two adjacent projections, especially during the Zzeneput zens.

Further advantages and features of the invention will become apparent from the claims and the following description in which embodiments of the invention are explained in detail with reference to the drawings. Showing:

Fig. 1 shows an end region of a filament according to the invention in a perspective view;

Fig. FIG. 2 shows the filament from FIG. 1 in a schematic cross section; FIG.

Fig. 3 shows a further embodiment of the fila

ment in a schematic cross section;

Fig. 4 shows another embodiment of the fila

ment in a schematic cross section;

Fig. 5 shows another embodiment of the fila

ment in a schematic cross section, Fig. 6 a twisted filament in perspective view and

Fig. 7 is a perspective view of the

The head of a toothbrush with a ver enlarged representation of some bristles end of the bristle trim.

Fig. 1 shows an end portion of a Fila element 10 of the invention, which extends along a longitudinal axis L. In the cross section of the filament 10 is a base body 11 he visually with a radially inner base portion 12. At the base portion 12 eight radially protruding projections 13 are formed, the uniform distribution over the cross section of the base portion 12 and point symmetrical to the center M of the cross section are arranged. In each case be adjacent projections 13 are in the circumferential direction by 45 ° ver is arranged to each other.

The projections 13 extend over the entire length of the filament 10 so as to form ribs 21 along the longitudinal axis L (FIG. 1). As viewed in the circumferential direction of the filament 10, the base body 11 is concavely curved in a transition region 19 between two adjacent projections 13, so that the base body 11 changes continuously in the circumferential direction from one projection 13 to the other. When brushing toothpaste is held in this transition region 19.

Four of the projections 13 are head part-free projections 13 which are offset in their alignment by 90 ° to each other is arranged. The remaining four projections 13 carry at their radially outer ends 14 each have a head portion 15. The ends 14 each have a radial recess 17 (see Fig. 2) with an undercut, in which a radially to the center point M of the cross-section directed engagement member 18 of the head portion 15 engages positively. As a result, the head parts 15 are positively connected to the projections 13 the verbun. In addition, the head parts 15 are materially welded to the projections 13.

As can be seen from Fig. 2, the radial ends 14 of those projections 13 which carry a head portion 15, measured without head part the same radial distance Si to the center M of the cross section as the radial vertex points 16 of the headless projections 13. This ra diale distance Si is about 100 pm. Due to the Kopftei le 15, the respective associated projections 13 have a larger radial distance S ₂ to the center M of the cross-section on. The distance S ₂ in the embodiment of FIG. 2 is about 110 pm. The difference S3 of the radial Ab states S ₂ and Si is about 20 pm (Fig. 3). This value corresponds to about 5% to 25%, in particular 10% of the radial distance Si of the köpfteilfreien projection 13 of FIG. 2. The head parts 15 project beyond all radial crest te 16 of the headless projections, in particular by a dimension S _3rd

The main body 11 of the filament 10 and in particular the base portion 12 and the projections 13 are integrally formed and made of a first plastic mater ial, for example, from a thermoplastic poly ester such as PBT (polybutylene terephthalate).

The head parts 15 are made of a second plastic material, for example a thermoplastic synthetic material. fabric material with a lower Shore hardness than the first plastic material. As a result, an improved cleaning effect is achieved when brushing teeth.

FIG. 2 shows a schematic cross-section of the filament 10 according to FIG. 1 with four projections 13 free of head defects and four projections 13, each with a head part 15, which are arranged alternately in the circumferential direction.

In a further embodiment according to FIG. 3, the filament 10 has three head part-free projections 13 and three jumps before 13, each with a head portion 15. Seen in the circumferential direction, the köpfteilfreien Vorsprün ge 13 alternate with the projections 13 with a head part 15, so that the köpfteilfreien projections 13 are arranged at an angle of 120 ° to each other. The same applies to the projections 13 with a head part 15th

FIG. 4 shows a further embodiment of the filament 10 which is similar to the embodiment of FIG. 2 and differs therefrom in that each projection 13 is provided with a head part 15. The head parts 15 are all made of the same second plastic material.

Fig. 5 shows a section through a similar to FIG. 4 filament 10, the four head parts 15 of the type mentioned from a third plastic material, while the four remaining head parts 15 are made of the second plastic material. The filament 10 of FIG. 5 thus consists of three components, wherein the third plastic material (like the second plastic material) has a lower Shore hardness than the first plastic material, but also like the second plastic material, a thermo - plastic elastomer is. By choosing the second and the third plastic material, the cleaning properties of the filament 10 are adjustable, in particular for the removal of plaque.

Fig. 6 shows a perspective schematic view ei nes the filament 10 of FIG. 1 similar filament 10, which differs from this in that it is twisted along its longitudinal axis L with 150 U / m, so that the projections 13 with the Head parts 15 extend helically around the longitudinal axis L.

FIG. 7 shows a head of a toothbrush 20, which has a bristle facing 22 with a multiplicity of bristles of filaments 10 according to the invention in the embodiment according to FIG.

1 carries.

Claims

claims

A filament having a base body (11) of a first plastic material extending along a longitudinal axis (L), the cross section of the base body (11) having a radially inner base portion (12) and a plurality of the base portion (12). radially outwardly projecting projections (13) which are formed integrally with the base portion (12), characterized in that at least one of the projections (13) at its radially outer end (14) has a head portion

(15) carries, which be made of a second plastic material, which is different from the first plastic material of the base body (11).

2. filament according to claim 1, characterized in that at least six projections (13), in particular at least eight projections (13) are provided.

3. Filament according to claim 1 or 2, characterized in that the projections (13) are distributed uniformly over the circumference of the base portion (12).

4. filament according to one of claims 1 to 3, characterized in that the projections (13) point-symmetrical to the center (M) of the cross section of the Basisab section (12) are arranged.

5. Filament according to one of claims 1 to 4, characterized in that a plurality of projections (13) each have a head part (15).

6. filament according to claim 5, characterized in that in the circumferential direction of the base portion (12) projections (13) with head parts (15) and head part-free projections (13) are arranged alternately.

7. filament according to claim 5, characterized in that each projection (13) has a head part (15).

8. filament according to one of claims 1 to 7, characterized in that the head part (15) at least positively and / or cohesively with the projection (13) verbun is the.

9. filament according to one of claims 1 to 8, characterized in that a radial vertex (16) of the head part (15) radially beyond the radial vertices of the jumps before (13).

10. filament according to one of claims 1 to 9, characterized in that the first plastic material of the base body (11) is a thermoplastic polyester, in particular PBT (polybutylene terephthalate).

11. Filament according to one of claims 1 to 10, characterized in that the second plastic material of the head part (15) is a thermoplastic material having a lower Shore hardness than the first plastic material and in particular a thermoplastic cal elastomer ,

12. Filament according to one of claims 1 to 11, characterized in that all the head parts (15) consist of the same material.

13. A filament according to any one of claims 1 to 12, characterized in that at least one head part (15) is made of egg NEM third thermoplastic material be, which is different from the first and the second plastic material.

14. Filament according to one of claims 1 to 13, characterized in that the monofilament is twisted about its longitudinal axis (L), so that the projections (13) and the at least one head part (15) along the longitudinal direction (L) of Filaments are arranged helically.

15. Toothbrush with at least one filament according to one of claims 1 to 14.