EP3348169B1 - Procédé et dispositif destinés à la fabrication d'une brosse - Google Patents

Procédé et dispositif destinés à la fabrication d'une brosse Download PDF

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Publication number
EP3348169B1
EP3348169B1 EP17208451.9A EP17208451A EP3348169B1 EP 3348169 B1 EP3348169 B1 EP 3348169B1 EP 17208451 A EP17208451 A EP 17208451A EP 3348169 B1 EP3348169 B1 EP 3348169B1
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EP
European Patent Office
Prior art keywords
cavity
bristles
bundle
die
filament material
Prior art date
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Active
Application number
EP17208451.9A
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German (de)
English (en)
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EP3348169A1 (fr
Inventor
Thomas Clos
Markus Ibrom
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M&C Schiffer GmbH
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M&C Schiffer GmbH
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Application filed by M&C Schiffer GmbH filed Critical M&C Schiffer GmbH
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    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/04—Machines for inserting or fixing bristles in bodies
    • A46D3/045—Machines for inserting or fixing bristles in bodies for fixing bristles by fusing or gluing to a body

Definitions

  • the present invention relates to a method for producing a brush with the preamble features of claim 1 and a device for producing a brush with the preamble features of claim 12.
  • a method for producing a brush with the preamble features of claim 1 and a device for producing a brush with the preamble features of claim 12.
  • Such a method and such a device are from US Pat DE 196 04 533 A1 famous.
  • bristle bundles are inserted into a bore of a carrier element and melted on the fastening side to form a thickening.
  • the melting takes place through a hollow punch which defines a plurality of cavities, the cavities of which are brought over the fastening-side ends of the bristle bundles in order to melt them.
  • the shape of the thickenings thus formed corresponds to that of the cavities.
  • the thickened areas of the bristle bundles are connected to one another, so that a row of bristles is created.
  • the row of bristles formed in this way is removed from the carrier element and inserted into a bore of a bristle carrier.
  • the thickened areas of the bristle bundles are then softened by a heated strip and pressed flat in order to fuse the filament material with the bristle carrier.
  • a bundle of bristles to be fastened to a carrier is inserted into a bore of a carrier element and then melted at its fastening-side end to form a thickening.
  • the thickening is surrounded by liquid plastic after solidification, which forms the carrier.
  • This known method is used to connect bristle bundles of a brush or an individual bristle bundle of an interdental brush to the carrier without anchors.
  • the carrier can form the handle of the brush as a whole, or only part of the same.
  • the end of the bundle of bristles is inserted into a mold which is then filled with the plastic in a molten state.
  • the plastic is usually injected by means of injection molding.
  • the aforementioned carrier element usually forms a delimitation of the mold cavity.
  • the carrier element is usually provided as a plate-shaped element and is used to complete a tool half of the injection mold.
  • the surface through which the bundle of bristles protrudes is usually flat.
  • the distance between the surface and the bundle of bristles also contributes to the thickness of the carrier. In particular in the case of toothbrushes, which are the focus of the present application, the smallest possible thickness is desired.
  • a bristle carrier is first prepared separately and at the same time is melted on with the ends of a bristle bundle on the fastening side.
  • the elements that are liquefied in this way and to be connected are joined.
  • a joining element holding the bristle bundle not only presses the bristle bundle into the recess of the carrier. Rather, when the bristle bundle is introduced, a crater edge which is initially pressed out of the plane of the carrier through which the bristle bundles usually protrude during melting is brought into contact behind a thickening produced by the melting, whereby the bristle bundles should be attached to the carrier with good pull-out strength.
  • this methodical approach is time-consuming.
  • the present invention is based on the problem of specifying a method for producing a brush which can have a small thickness and in which the bristle bundle is held with the necessary pull-out strength with good parallel alignment of the bristle filaments of a bristle bundle.
  • the present invention also aims to provide a device suitable for carrying out the method.
  • the present invention proposes that a hollow punch provided with a cavity be placed over the fused ends of the bristle bundle in such a way that the cavity at least partially accommodates the thickening.
  • the cavity which is usually essentially closed on all sides when the hollow punch rests against a surface of the carrier element, forms a chamber in which the melted filament material is reshaped.
  • a displacement ram is pressed against the thickening in the procedure according to the invention.
  • the displacement ram is accordingly provided in such a way that it can be introduced into the cavity after the cavity has been at least partially brought over the ends of the bristle bundle.
  • the displacement punch presses against the melted end, so that the filament material forming the thickening is displaced, for example, is pressed against the hollow punch or a surface of the carrier element, and solidifies there. In this way, a targeted reshaping of the melted filament material is achieved within the cavity.
  • the fused filament material can be pressed in a defined manner against the surface of the carrier element. Because of The guidance of the bristle bundle in the bore of the carrier element results in a stable orientation of the filaments after the solidification of the material deformed by the displacement ram, preferably compressed within the cavity, which is secured by the solidified filament material. This makes it possible to place the bristle bundle directly against the surface of the carrier element during injection molding, so that a carrier of the brush with a small thickness can be produced.
  • the bristle bundle can be melted on the fastening side in a separate station and only then transferred to a station with an already melted thickening, in which the melted thickening is deformed via the hollow punch and the displacement punch.
  • the displacement ram can serve as a heat source, which initially melts on approaching the end of the bristle bundle, for example by switching on a heat source provided on the displacement ram. The heat source is then switched off, so that when the melt solidifies, the displacement die displaces the filament material in the cavity, preferably pressing it into a specific shape.
  • identical or different filaments can be implemented on a bundle of bristles and / or to form different bundles of bristles.
  • At least one bundle of bristles can consist of conventional material, regularly drawn polyamide. However, at least one bundle of bristles can also be implemented as a flexible cleaning element.
  • the filament material is preferably reshaped in such a way that a plug formed from the melt is pushed partially parallel to the filaments of the bristle bundle in the direction of the use-side end in order to grasp the filaments circumferentially as solidified filament material and thus stabilize their parallel alignment.
  • the transition between the non-melted filament material and the melted filament material is then at a sufficient distance from the surface of the carrier element.
  • the cavity defines a chamber, which restricts the mobility of the melted filament material during reshaping by the displacement punch.
  • the chamber preferably also acts as a type of die against which the melted material is completely placed in order to achieve a certain compression of the melted material within the cavity.
  • the hollow punch is preferably placed against the carrier element before the displacement punch presses against the thickening.
  • the cavity is completely filled by the filament material displaced by the displacement punch, i.e. by the previously produced melt.
  • the displacer stamp pushes the filament material out of the cavity.
  • the hollow punch has openings, in particular at its end resting against the carrier element, through which the filament material can be forced out of the cavity.
  • a bead can additionally or alternatively be formed on the carrier element, which bead allows filament material to escape from the cavity in the event of excessive internal pressure in the cavity.
  • the thickening specifically formed in this way can - as in the prior art - be used in an injection mold and surrounded by a plastic material that forms the carrier in order to both form the carrier and at the same time connect the bundle of bristles to the carrier.
  • a specific geometric configuration can also be impressed on the thickening by means of the hollow punch and the displacement punch.
  • the thickening with its outer contour can be designed to be adapted to the outer contour of a bore within the carrier.
  • a bristle bundle or a plurality of bristle bundles prepared in this way can be pressed into the corresponding bore and fastened to it.
  • Form-fitting and / or locking elements can be formed on the outer surface of the thickening in order to fasten the bristle bundle or several bristle bundles to the carrier in the manner of a bayonet lock. It is also possible to design the thickening in the shape of a truncated cone, the area of the smaller diameter being able to form the fastening-side end of the thickening and of the bristle bundle.
  • the carrier can have a correspondingly frustoconical contour so that the bristle bundle can be fastened to the carrier by being pressed into the cone.
  • ribs can also protrude, which cooperate with corresponding grooves of the carrier in order to hold the bundle of bristles in a rotationally secure manner.
  • filament material preferably the entire filament material, which forms the thickening
  • filament material is preferably arranged within the cavity before the introduction of the displacement punch.
  • several bundles of bristles to arrange their fastening-side ends in a single cavity and to connect the melt droplets formed by the individual bundles of bristles to one another by the acting displacement punch.
  • a foundation connecting all the bristle bundles can be formed from the filament material of these bristle bundles, which in the solidified state fixes the bristle bundles with a predetermined orientation to one another and which preferably fixes all the filaments of each individual bristle bundle in a predetermined orientation relative to one another.
  • the foundation has a contour corresponding to the contour of the carrier element in the area of the bores receiving the bristle bundles.
  • the foundation is usually also formed against a surface of the carrier element in that the displacement die presses the filament material against this surface.
  • the foundation has a contour corresponding to the surface of the carrier element in the area of the bores.
  • This contour can be convex or concave.
  • the bores diverge outward starting from the recess, so that the bundles of bristles held and guided in the bores form a spherical segment-shaped envelope surface on the finished brush after demolding from the carrier element.
  • the bristle bundles protrude from a spherical or otherwise convex surface of the bristle carrier. If the bristle bundles are each provided with the same length, then all the ends of the bristle bundles on the use side span a spherical segment-shaped envelope surface.
  • bristle bundles are of different lengths, their usage-side ends lie in a spherical segment-shaped envelope plane which has a certain extent in the longitudinal direction of the bristle bundles, corresponding to the difference between the shortest and the longest bristle bundle.
  • the channels converge with the result that the ends of different bristle bundles on the use side are provided closer to one another than their ends on the fastening side.
  • a compacted, cleaning-active surface can be provided on the brush by means of various bundles of bristles.
  • Bundles of bristles of different filament diameters and / or material properties can also be combined with one another in order to provide different cleaning characteristics in a concentrated area.
  • the carrier element can be built into the injection mold to complete an injection mold and to delimit the mold cavity formed thereby.
  • a carrier element in the sense of the present invention can, however, also be an element provided with bores, which is only used for preparation of the bristle bundle is used, while the connection between the plastic forming the carrier and the bristle bundle takes place without the corresponding carrier element.
  • the carrier element is usually designed in the form of a plate, it being possible for the recess discussed above or several thereof to be realized in a way that deviates from the planar configuration of the carrier element.
  • Such an essentially plate-shaped carrier element is also referred to as a perforated field plate in the prior art.
  • the perforated field plate known from the prior art can be used to prepare the bristle bundles, which reduces the investment outlay for carrying out the method.
  • the carrier produced by the method according to the invention can, for example, form the main body of a brush, which is overmolded with a further or third component in a subsequent injection molding cycle in order to form flexible cleaning elements and / or grip pads or areas of different colors for decorative purposes, in particular from a flexible material.
  • the soft elastic material can in particular be a thermoplastic elastomer.
  • the carrier elements prepared in this way are stuffed with the bristle bundles on the separate stretch.
  • the bristle bundles can be contoured in a manner known per se, i.e. filaments of a bristle bundle are axially displaced in order to arrange the usage-side ends of the filaments of a bristle bundle on different planes at right angles to the longitudinal extension of the filaments.
  • the thickening is produced by melting and reshaping by means of a displacement punch within the cavity of the hollow punch.
  • the carrier element is usually inserted directly into the injection mold to complete it. Liquid plastic is used to form the carrier in the injection mold.
  • the device proposed with the independent aspect of the present invention is defined in claim 12.
  • the device has a hollow plunger which is movable relative to the carrier element and which defines a cavity.
  • the device has a displacement ram which is movable relative to the carrier element and relative to the hollow ram.
  • the hollow punch has a recess through which the displacement punch can be introduced into the cavity.
  • the recess is preferably designed in such a way that the displacement ram is guided with little play within the hollow ram.
  • the game should be designed so that when displacing and compressing the melted Filament material no filament material gets into the recess receiving the displacement punch.
  • the heating device for melting the fastening-side end of the bristle bundle can be of conventional design, as shown in FIG EP 0 405 204 A2 is known.
  • a heating device can also be assigned to the hollow punch and / or the displacement punch, by means of which the fastening-side end of the bristle bundle is melted.
  • an infrared light source can be provided on the hollow punch and / or the displacement punch, which is first switched on in order to heat and melt the end of the bristle bundle on the attachment side before the filament material is displaced or pressed.
  • the Figure 1a shows a schematic sectional view through a carrier element 2, which has a bore 4 for receiving a bristle bundle 6.
  • the Figures 1a to f show different stations of the same carrier element 2, wherein the carrier element 2 can be moved between the stations 1a, 1b and 1c.
  • Figure 1a shows the bundle of bristles 6 after the carrier element 2 has been stuffed.
  • the bundle of bristles 6 protrudes beyond the carrier element 2 on both sides. It can be supported in the area of its use-side end 8 via a holding plate in order to arrange the fastening-side ends 10 at a distance from a surface 12 of the carrier element 2.
  • the displacement punch 20 already acts when the hollow punch 18 is placed against the surface 12 and in its starting position against the thickening 16 has been created. This position is in Figure 1e shown. However, the figure also shows that a cavity 24 provided in the hollow punch 18 is not yet completely filled with the filament material forming the thickening 16.
  • the displacement ram 20 is shown in the sequence from Figure 1e to Figure 1f axially displaced relative to the hollow punch 18. The free volume of the cavity 24 is thereby reduced. The filament material forming the thickening 16 is displaced. It comes against the walls of the hollow punch 18 defining the cavity 24.
  • the hollow punch 18 is usually much colder than the temperature of the thickening 16.
  • the filament material heated to melt cools down immediately and solidifies with a contour given by the outer walls of the cavity 24 .
  • the filament material can also solidify due to the ambient temperature.
  • a rectangular cross-sectional area of the cavity 24 is illustrated. It goes without saying that any desired geometry is possible, with configurations without an undercut being preferred.
  • the cavity 24 can also be hemispherical.
  • the hollow punch 18 is pulled off the carrier element 2 together with the displacement punch 20.
  • the carrier element 2 can now be used to complete an injection mold in this.
  • the filament material formed by melting is also pressed in the direction of the usage-side ends 8 of the bristle bundles 6, so that the bristle bundles are held circumferentially over a certain length range in the solidified foundation 26 and guided through the foundation 26.
  • This ensures the parallel alignment of the individual filaments forming a bristle bundle 6 during subsequent injection molding.
  • Such bundles of bristles cannot be tolerated, particularly in the case of toothbrushes. The resulting brush is unusable.
  • the carrier element 2 has a concave recess 28, from which a plurality of outwardly diverging bores 4 extend.
  • the recess 28 is hemispherical or designed in the manner of a semi-ellipse.
  • the recess 28 extends from an essentially flat carrier element 2 away. Due to the divergent configuration of the bores 4, the bristle bundles 6 made therein are provided with their fastening-side ends 10 close to one another (cf. Fig. 2a ). These fastening-side ends 10 are in the in Figure 2b shown state 2c already melted.
  • a melt area 30 connecting all the bristle bundles 6 has resulted, which is shown in FIG Figure2c1 is already limited laterally by an alternative embodiment of a hollow punch 18.
  • the hollow punch 18 rests in the area of an edge of the carrier element 2 at which the recess 28 merges into the flat surface 12 of the carrier element 2.
  • a cavity, identified by reference number 24, is formed between the hollow punch 18 and the surface of the recess 28.
  • the carrier element is only shown with its top contour.
  • the carrier element can be similar to the embodiment according to Figure 1 be designed so that the usage-side ends 8 of the bristle bundles 6 protrude beyond the carrier element 4.
  • a contact shell is provided corresponding to the desired contour of the use-side ends 8 of the bristle bundles 6, against which the bristle bundles 6 rest on the use-side.
  • the carrier element 2 can, however, also be designed with a thickness such that the bristle bundles 6 are received in the carrier element 2 as a whole.
  • the bores 4 can be designed as blind holes, which also specify the axial positioning of the bristle bundles 6 within the bores 4.
  • the bores 4 can be designed as through bores. Punches introduced into a respective bore 4 can act against the usage-side ends 8 of the bristle bundles 6, which predetermine the axial position of the bristle bundles 6 and thus the fastening-side ends 4 within the recess 28 and counteract them against the contact pressure of the displacement plunger 20. It goes without saying that measures can be implemented on the tool side, by means of which the individual filaments of each bristle bundle 6 are axially displaced in order to contour a bristle bundle 6, ie to let the usage-side ends of different filaments of a bristle bundle 6 end at different heights.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)

Claims (14)

  1. Procédé de fabrication d'une brosse, dans lequel au moins un faisceau de crins (6) à fixer au niveau d'un support est inséré dans un alésage (4) d'un élément porteur (2), fondu du côté de la fixation afin de former un épaississement (16) et relié au support, et un poinçon creux (18) définissant une cavité (24) est amené au-dessus de l'extrémité (10) située côté fixation du faisceau de crins (6) de sorte que sa cavité (24) accueille au moins partiellement l'épaississement (16), caractérisé en ce qu'un poinçon de déplacement (20) pouvant être introduit dans la cavité (24) est pressé contre l'extrémité fondue du faisceau de crins (6) de sorte qu'un matériau filamentaire formant l'épaississement (16) est déplacé et solidifié.
  2. Procédé selon la revendication 1, caractérisé en ce que le matériau filamentaire formant l'épaississement (16) est forcé contre le poinçon creux (18).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le poinçon creux (18) est placé contre l'élément porteur (2) avant que le poinçon de déplacement (20) appuie contre l'extrémité (10) fondue située côté fixation.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la cavité (24) est remplie par le matériau filamentaire déplacé grâce au poinçon de déplacement (20).
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le poinçon de déplacement (20) force le matériau filamentaire hors de la cavité (24).
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le matériau filamentaire est pressé dans la cavité (24) grâce au poinçon de déplacement (20).
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que plusieurs faisceaux de crins (6) sont agencés côte à côte et sont fondus du côté de la fixation et en ce que le matériau filamentaire se trouvant dans la cavité (24) est déplacé grâce au poinçon de déplacement (20) de sorte qu'une fondation (26) reliant tous les faisceaux de crins (6) est formée à partir du matériau filamentaire et est solidifiée.
  8. Procédé selon la revendication 7, caractérisé en ce que les faisceaux de crins (6) avec leurs épaississements (16) situés côté fixation sont agencés dans un évidement (28) de l'élément porteur (2) et en ce que le poinçon creux (18) est mis en appui contre l'élément porteur (2) au niveau d'un bord de l'évidement (28).
  9. Procédé selon la revendication 7 ou 8, caractérisé en ce que les faisceaux de crins (6) sont retenus dans l'élément porteur (2) de manière à diverger vers l'extérieur à partir de l'évidement (28) et sont reliés entre eux par l'intermédiaire de la fondation (26) de sorte que les extrémités (8), situées côté utilisation, du faisceau de crins (6) se situent dans un plan-enveloppe en forme de segment sphérique.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, après solidification, l'épaississement (16) est entouré d'une matière plastique fluide formant le support.
  11. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que l'épaississement est formé au-dessus du poinçon de déplacement (20) et de la cavité (24) de sorte qu'une patte de fixation prédéfinie est formée grâce à l'épaississement, et en ce que le faisceau de crins (6) ainsi préparé est inséré de manière ajustée dans un alésage, conçu pour accueillir la patte de fixation, du support et y est fixé.
  12. Appareil permettant de produire une brosse comprenant un élément porteur (2) muni d'un alésage (4) et permettant d'accueillir un faisceau de crins (6), un dispositif de chauffage permettant de faire fondre une extrémité (10), située côté fixation, du faisceau de crins (6) et un poinçon creux (18) mobile par rapport à l'élément porteur (2) et définissant une cavité (24), caractérisé par un poinçon de déplacement (20) mobile par rapport à l'élément porteur (2) et au poinçon creux (18) et pouvant être introduit dans la cavité (24) à travers un alésage d'accueil (22) formé au niveau du poinçon creux (18).
  13. Dispositif selon la revendication 12, caractérisé en ce que l'élément porteur (2) présente un évidement (28) à partir duquel s'étendent plusieurs alésages (4) divergents.
  14. Appareil selon la revendication 12 ou 13, caractérisé en ce que l'évidement (28) est concave.
EP17208451.9A 2017-01-12 2017-12-19 Procédé et dispositif destinés à la fabrication d'une brosse Active EP3348169B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017200451.7A DE102017200451B4 (de) 2017-01-12 2017-01-12 Verfahren und Vorrichtung zum Herstellen einer Bürste

Publications (2)

Publication Number Publication Date
EP3348169A1 EP3348169A1 (fr) 2018-07-18
EP3348169B1 true EP3348169B1 (fr) 2021-08-04

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EP17208451.9A Active EP3348169B1 (fr) 2017-01-12 2017-12-19 Procédé et dispositif destinés à la fabrication d'une brosse

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DE (1) DE102017200451B4 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3403341A1 (de) 1984-02-01 1985-08-08 Coronet - Werke Heinrich Schlerf Gmbh, 6948 Wald-Michelbach Verfahren zum verbinden von borsten mit einem borstentraeger
ES2060869T3 (es) 1989-06-24 1994-12-01 Frisetta Gmbh Procedimiento y dispositivo para producir campos de cerdas o haces de cerdas.
DE4302870A1 (de) * 1993-02-02 1994-08-04 Zahoransky Anton Fa Verfahren zum Herstellen von Bürsten und Bürstenherstellungsmaschine
DE19604533A1 (de) * 1996-02-08 1997-08-14 Vorwerk Co Interholding Verfahren zur unmittelbaren Verbindung eines Borstenbündels aus thermoplastischen Kunststoffasern mit einem Borstenträger

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DE102017200451B4 (de) 2021-02-25
DE102017200451A1 (de) 2018-07-12

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