EP2337474A2 - Method for producing brushes, particularly toothbrushes - Google Patents

Method for producing brushes, particularly toothbrushes

Info

Publication number
EP2337474A2
EP2337474A2 EP09777899A EP09777899A EP2337474A2 EP 2337474 A2 EP2337474 A2 EP 2337474A2 EP 09777899 A EP09777899 A EP 09777899A EP 09777899 A EP09777899 A EP 09777899A EP 2337474 A2 EP2337474 A2 EP 2337474A2
Authority
EP
European Patent Office
Prior art keywords
soft elastic
brush body
fiber bundles
elastic material
carrier plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09777899A
Other languages
German (de)
French (fr)
Other versions
EP2337474B1 (en
Inventor
Bart Gerard Boucherie
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GB Boucherie NV
Original Assignee
GB Boucherie NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GB Boucherie NV filed Critical GB Boucherie NV
Publication of EP2337474A2 publication Critical patent/EP2337474A2/en
Application granted granted Critical
Publication of EP2337474B1 publication Critical patent/EP2337474B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/06—Machines for both drilling bodies and inserting bristles
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B3/00—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier
    • A46B3/06—Brushes characterised by the way in which the bristles are fixed or joined in or on the brush body or carrier by welding together bristles made of metal wires or plastic materials
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B9/00—Arrangements of the bristles in the brush body
    • A46B9/02—Position or arrangement of bristles in relation to surface of the brush body, e.g. inclined, in rows, in groups
    • A46B9/04—Arranged like in or for toothbrushes
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D3/00—Preparing, i.e. Manufacturing brush bodies
    • A46D3/005—Preparing, i.e. Manufacturing brush bodies by moulding or casting a body around bristles or tufts of bristles
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • the invention relates to a method for producing brushes, in particular toothbrushes.
  • a continuous layer of the soft elastic material is formed on the rear side of the carrier plate at the same time as the soft elastic element or a plurality of soft elastic elements is injection molded.
  • This layer of soft elastic material can serve various purposes.
  • the carrier plate is attached to a brush body.
  • the carrier plate with the fiber bundles attached thereto is introduced into an injection mold and injection-molded to form the brush body.
  • the holes or recesses of the support plate, which are provided for soft elastic elements remain free, and in a subsequent further manufacturing step, the soft elastic mass is injected through the free holes or recesses in an injection mold.
  • a continuous layer of soft elastic material is formed on the back side of the brush body. This layer of soft elastic material is integral with the soft elastic elements integrated into the bristle field.
  • the exposed on the back of the brush body layer of soft elastic material may have the function of a tongue cleaner or even give the brush desired optical or haptic properties.
  • the layer of flexible material is also formed on the back side of the carrier plate, but lies directly above the layer of the fused attachment ends of the fiber bundles.
  • the carrier plate with the fiber bundles attached thereto is introduced into an injection mold, and the soft-elastic mass is injected through the holes or recesses of the carrier plate released from the melt.
  • the layer of soft elastic material on the back of the carrier plate covers the fused attachment ends of the fiber bundles and is molded integrally with the pin or plate-shaped, soft elastic elements that are integrated into the bristle field. Subsequently, the carrier plate with attached fiber bundles, soft elastic elements and the layer of soft elastic material is connected to a brush body.
  • the layer of soft elastic material is disposed inside the brush and is not visible to the outside. Their function is to form a perfect seal on the back of the carrier plate.
  • This seal is useful on the one hand in the use of the brush, especially as a toothbrush, as it prevents any ingress of moisture or foreign bodies into the interior of the brush.
  • Particularly useful is the seal through the layer of soft elastic material when the carrier plate is encapsulated to form the brush body in an injection mold with plastic compound. During this process, care must be taken that the injected plastic mass does not penetrate into the bundle holes, which results in a critical injection pressure.
  • a method of manufacturing brushes in which the fiber bundles are also secured to a support plate by fusing the attachment ends and the support plate has at least one additional hole or recess in addition to the bundle holes.
  • the further hole or the recess can be used both for molding a soft elastic element and for the later attachment of separately manufactured parts such as so-called. Stimulators.
  • Figure 1 shows various steps of a first embodiment of the manufacturing process in plan view.
  • FIG. 2 shows the same steps of the first embodiment of the manufacturing method in perspective view from the front side
  • FIG. 3 shows the same steps of the first embodiment of the manufacturing method in perspective view from the rear side
  • FIG. 6 shows the same steps in the second embodiment of the production method in perspective view from the rear side
  • FIGs 7 to 9 the same steps of the first embodiment in another brush.
  • Figures 10 to 12 the same steps of the second embodiment in another brush.
  • FIG. 13 is a schematic perspective view for illustrating a particular aspect of the invention.
  • FIGS. 1 a to d Four steps of a first embodiment of the method according to the invention for producing a brush, in this case a toothbrush, are shown in FIGS. 1 a to d.
  • FIG. 1a is a plan view of a plastic carrier sheet 10 having a group of bundle holes 12 whose arrangement corresponds to a desired bristle pattern. In addition to these bundle holes 12, there are further holes 14 which have a particular designation.
  • the carrier plate 10 has a generally oval shape corresponding to the head of a toothbrush. It can be made by injection molding.
  • Fiber bundles 16 are inserted into the bundle holes 12 of the carrier plate 10, the attachment ends of which are melted on the back side of the carrier plate in order to fasten the fiber bundles to the carrier plate.
  • the carrier plate 10 with the fiber bundles 16 fastened thereto is shown in FIGS. 1 b, 2 b and 3 b. It can be seen that the special holes 14 are unpopulated.
  • FIG. 3b shows that the molten attachment ends of the fiber bundles 16 form a continuous layer 17 on the rear side of the carrier plate 10. In this continuous layer 17 of the melt surface areas are recessed, which correspond to the specific holes 14, so that they remain free of melt. This can be achieved in different ways.
  • a first measure is to make the carrier plate 10 with melt edges which delimit the area into which the melt can flow.
  • Another possibility is to use a heating punch for melting, which come into contact with the fiber ends surfaces edge contours that limit the flow of the melt.
  • Another possibility is to place a mask over the carrier plate, this mask having suitably shaped edges which limit the flow of the melt. Below, an embodiment using such a mask will be described with reference to FIG.
  • the carrier plate with the fiber bundles attached thereto is connected to the head of a brush body 18.
  • the connection Forming the carrier plate with the brush body can be done in two ways.
  • a first variant of the brush body is made separately and provided with a recess into which the carrier plate is inserted with the attached fiber bundles. Subsequently, the carrier wafer is welded to the head region of the brush body in order to produce a non-detachable connection.
  • the carrier plate is introduced with the fiber bundles attached thereto in an injection mold and molded with plastic, whereby the head and stem of the brush body are formed.
  • the special holes 14 remain at least largely free. As can be seen in Figure 3c, go through the special holes 14 to the back of the brush head, since the brush body has corresponding recesses in the head area.
  • the brush body is provided with a flat recess 20 on the back of its head region.
  • the brush body 18 with attached carrier plate 10, as shown in Figures 1c, 2c and 3c, is then introduced into an injection mold, in order to produce in a further manufacturing step, a soft elastic mass, an elastomer such as TPE or the like, through the special holes 14 and suitable To inject cavities so that pin-shaped elements 22 are made of soft elastic material anchored in the holes 14.
  • These soft-elastic elements 22 are part of the bristle field and are in the embodiment shown here at the two longitudinal edges of the brush head.
  • the soft elastic mass is injected into the recess 20 at the back of the brush head, so that a continuous layer 24 of soft elastic material is formed, which fills the entire recess 20 and through the holes 14 with the soft elastic elements 22 in one piece connected is.
  • the layer 24 of soft elastic material thus occupies the back of the brush head and can, for example, have the function of a tongue cleaner. Their function can only be to give the brush a special look or feel.
  • the soft elastic elements 22 have in particular a cleaning or massage function.
  • the layer 24 of soft elastic material does not necessarily have to be introduced into a recess of the brush head. If no recess 20 is present, the layer 24 is raised on the back of the brush head and has the same function.
  • the soft-elastic elements 22a are injection-molded directly onto the carrier plate 10a.
  • a continuous layer 24a of soft elastic material is formed on the back of the carrier plate 10a, which completely covers the layer 17a of molten attachment ends of the fiber bundles formed in the previous step.
  • the carrier plate 10a with the fiber bundles 16a, soft elastic elements 22a and the soft elastic material layer 24a attached thereto is attached to a brush body 18a.
  • this can be done in two ways, be injected by attaching the carrier plate to a separately prepared brush body, on the other hand by molding the carrier plate with the material from the stem and head of the brush body.
  • the soft elastic material layer 24a inside the brush head is sandwiched between the layer 17a and an inner wall of the brush head.
  • the layer 24a has here mainly the function of a seal. In particular, it forms a perfect seal of the bundle holes 12a both against penetration of moisture or foreign bodies from the outside into the interior of the brush head and against plastic mass of the brush body during the injection molding of the carrier plate under high injection pressure.
  • Figures 7, 8 and 9 show a variant of the first embodiment of the method and therefore largely correspond to Figures 1, 2 and 3.
  • Different is only the brush, in particular the bristle field with an integrated soft elastic element.
  • This soft elastic element 22b is generally cross-shaped in plan view and is located in the middle of the bristle field. Accordingly, the support plate 10b has in its center a recess 14b, in which the soft elastic element 22b is anchored.
  • the production follows in the same way as shown in Figures 1, 2 and 3 and is therefore not described again.
  • FIGS. 10, 11 and 12 follow the second embodiment of the method and thus correspond to FIGS. 4, 5 and 6, but show a variant of a toothbrush shown in FIGS. 7, 8 and 9 , The process steps shown in FIGS. 10, 11 and 12 will therefore not be described again.
  • FIG. 13 shows the use of a mask 28 for limiting the flow of the melt, which is generated when the attachment ends of the fiber bundles come into contact with the heated surface of a punch 30, in one embodiment of the brush, which is the one shown in FIGS , 8 and 9 or 10, 11 and 12 corresponds.
  • the mask 28 has, on the one hand, an edge which bounds the outer edge of the molten layer and, on the other hand, an island region 32 which delimits the region around the recess 14b of the carrier plate 10.
  • the mask 28 is made as a plate, for example made of steel.
  • a mask 28 may be used if the carrier plate has only ordinary bundle holes and no special holes or recesses for soft-elastic elements or the like. In this case, the mask 28 limits only the outer edge of the melt. This makes it possible to use completely flat carrier plates which do not have an integrally formed raised boundary for the melt, such as e.g. shown in Fig. 12a.

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

Abstract

The invention relates to the use of carrier plates having holes for fiber bundles and at least one hole or recess for a soft elastic element used for producing brushes, particularly toothbrushes. The fiber bundles are inserted into the holes, and the fastening ends of the fiber bundle protruding out of the holes are attached to the carrier plate by fusing. The hole or recess for a soft elastic element is thereby at least largely kept away from the fused material. The soft elastic element is produced by injecting in an injection mold through the hole or recess, forming a layer of the soft elastic material on the side of the fused fastening ends of the fiber bundle. The carrier plate is combined with a brush body before or after injecting the soft elastic material. To this end, the brush body is either produced separately and connected to the carrier plate by welding or the like, or the carrier plate is encapsulated by the mass of the brush body.

Description

Verfahren zur Herstellung von Bürsten, insbesondere Zahnbürsten Method for producing brushes, in particular toothbrushes
Die Erfindung betrifft ein Verfahren zur Herstellung von Bürsten, insbesondere Zahnbürsten.The invention relates to a method for producing brushes, in particular toothbrushes.
Traditionell erfolgt die Befestigung von Borstenbündeln oder Faserbündeln an Bürstenkörpern mittels Schlingen oder metallischen Ankerplättchen. Bei Verfahren, die ohne Schlingen oder Ankerplättchen auskommen, werden Faserbündel an Trägerplättchen befestigt, indem ihre Befestigungsenden in Löcher des Trä- gerplättchens eingeführt und auf dessen Rückseite verschmolzen werden. Es besteht vielfach der Wunsch, außer den üblichen Borsten und Faserbündeln auch Reinigungselemente in das Borstenfeld zu integrieren (z.B. Reinigungselemente aus weichelastischem Material, Stifte, Stäbchen, Plättchen usw.). Zu diesem Zweck werden die Trägerplättchen mit zusätzlichen Löchern oder Aussparungen versehen, in die das weichelastische Material mit einer Spritzgießtechnik eingebracht wird. Mit dem erfindungsgemäßen Verfahren, das in den beigefügten Patentansprüchen angegeben ist, wird zugleich mit der spritztechnischen Herstellung des weichelastischen Elements oder mehrerer weichelastischer Elemente eine durchgehende Schicht des weichelastischen Materials auf der Rückseite des Trägerplättchens gebildet. Diese Schicht aus weichelastischem Material kann verschiedenen Zwecken dienen.Traditionally, the attachment of bristle bundles or fiber bundles to brush bodies by means of slings or metallic anchor plates. In processes that do not require loops or anchor plates, fiber bundles are attached to carrier platelets by inserting their attachment ends into holes in the carrier plate and fusing them to the back thereof. There is often a desire to incorporate cleaning elements into the bristle field (e.g., soft elastic cleaning elements, pins, rods, platelets, etc.) in addition to conventional bristles and fiber bundles. For this purpose, the carrier plates are provided with additional holes or recesses, in which the soft elastic material is introduced by an injection molding technique. With the method according to the invention, which is indicated in the appended patent claims, a continuous layer of the soft elastic material is formed on the rear side of the carrier plate at the same time as the soft elastic element or a plurality of soft elastic elements is injection molded. This layer of soft elastic material can serve various purposes.
Bei einer ersten Ausführungsform des Verfahrens wird das Trägerplättchen, nachdem die Faserbündel daran befestigt sind, an einem Bürstenkörper befestigt. Alternativ wird das Trägerplättchen mit den daran befestigten Faserbündeln in eine Spritzgießform eingebracht und umspritzt, um den Bürstenkörper zu bil- den. In beiden Fällen bleiben die Löcher oder Aussparungen des Trägerplättchens, die für weichelastische Elemente vorgesehen sind, frei, und in einem anschließenden weiteren Herstellungsschritt wird die weichelastische Masse durch die freien Löcher oder Aussparungen in einer Spritzgießform eingespritzt. Dabei wird eine durchgehende Schicht aus weichelastischem Material auf der Rücksei- te des Bürstenkörpers gebildet. Diese Schicht aus weichelastischem Material ist einteilig mit den weichelastischen Elementen verbunden, die in das Borstenfeld integriert sind. Die an der Rückseite des Bürstenkörpers frei liegende Schicht aus weichelastischem Material kann die Funktion eines Zungenreinigers haben oder auch lediglich der Bürste gewünschte optische oder auch haptische Eigenschaf- ten verleihen.In a first embodiment of the method, after the fiber bundles are attached thereto, the carrier plate is attached to a brush body. Alternatively, the carrier plate with the fiber bundles attached thereto is introduced into an injection mold and injection-molded to form the brush body. In both cases, the holes or recesses of the support plate, which are provided for soft elastic elements, remain free, and in a subsequent further manufacturing step, the soft elastic mass is injected through the free holes or recesses in an injection mold. In this case, a continuous layer of soft elastic material is formed on the back side of the brush body. This layer of soft elastic material is integral with the soft elastic elements integrated into the bristle field. The exposed on the back of the brush body layer of soft elastic material may have the function of a tongue cleaner or even give the brush desired optical or haptic properties.
Gemäß einer anderen Ausführungsform des Verfahrens wird die Schicht aus weichelastischem Material ebenfalls auf der Rückseite des Trägerplättchens gebildet, liegt jedoch unmittelbar über der Schicht der verschmolzenen Befestigungsenden der Faserbündel. Bei dieser Ausführungsform des Verfahrens wird das Trägerplättchen mit den daran befestigten Faserbündeln in eine Spritzgießform eingebracht, und die weichelastische Masse wird durch die von der Schmelze freigelassenen Löcher oder Aussparungen des Trägerplättchens gespritzt. Die Schicht aus weichelastischem Material auf der Rückseite des Trägerplättchens deckt die verschmolzenen Befestigungsenden der Faserbündel ab und wird ein- teilig mit den stift- oder plättchenförmigen, weichelastischen Elementen gespritzt, die in das Borstenfeld integriert werden. Anschließend wird das Trägerplättchen mit daran befestigten Faserbündeln, weichelastischen Elementen und der Schicht aus weichelastischem Material mit einem Bürstenkörper verbunden. Dazu kann es an einem fertigen Bürstenkörper befestigt werden, beispielsweise durch Verschweißen, oder es wird in einer Spritzgießform zur Bildung des Bürstenkörpers umspritzt. Bei dieser Ausführungsform ist die Schicht aus weichelastischem Material im Inneren der Bürste angeordnet und nach außen nicht sichtbar. Ihre Funktion besteht darin, eine perfekte Abdichtung auf der Rückseite des Trägerplättchens zu bilden. Diese Abdichtung ist einerseits im Gebrauch der Bürste, besonders als Zahnbürste, nützlich, da sie jegliches Eindringen von Feuchtigkeit oder Fremdkörpern in den Innerraum der Bürste verhindert. Besonders nützlich ist die Abdichtung durch die Schicht aus weichelastischem Material, wenn das Trägerplättchen zur Ausbildung des Bürstenkörpers in einer Spritzgießform mit Kunststoffmasse umspritzt wird. Bei diesem Vorgang muß darauf geachtet wer- den, daß die gespritzte plastische Masse nicht in die Bündellöcher eindringt, was einen kritischen Spritzdruck zur Folge hat. Durch die Abdichtung der Bündellöcher mit der Schicht aus weichelastischem Material wird der Spritzdruck gut beherrschbar. Gemäß einem weiteren Aspekt der Erfindung wird ein Verfahren zur Herstellung von Bürsten vorgeschlagen, bei dem gleichfalls die Faserbündel durch Verschmelzen der befestigungsenden an einem Trägerplättchen befestigt werden und das Trägerplättchen außer den Bündellöchern wenigstens ein weiteres Loch oder eine Aussparung aufweist. Das weitere Loch oder die Aussparung kann sowohl zum Anspritzen eines weichelastischen Elements als auch zur späteren Anbringung von separat hergestellten Teilen wie sog. Stimulatoren verwendet werden. In jedem Fall wird dafür gesorgt, daß die Schmelze der Faserbündel das weitere Loch oder die Aussparung nicht verschließt. Erreicht wird dies durch Be- grenzen des Flusses der Schmelze mittels geeignet geformter Randkonturen an den Trägerplättchen, Umrandungen an einem zum Schmelzen verwendeten erhitzten Stempel oder mittels einer Maske.According to another embodiment of the method, the layer of flexible material is also formed on the back side of the carrier plate, but lies directly above the layer of the fused attachment ends of the fiber bundles. In this embodiment of the method, the carrier plate with the fiber bundles attached thereto is introduced into an injection mold, and the soft-elastic mass is injected through the holes or recesses of the carrier plate released from the melt. The layer of soft elastic material on the back of the carrier plate covers the fused attachment ends of the fiber bundles and is molded integrally with the pin or plate-shaped, soft elastic elements that are integrated into the bristle field. Subsequently, the carrier plate with attached fiber bundles, soft elastic elements and the layer of soft elastic material is connected to a brush body. For this purpose, it can be attached to a finished brush body, for example by welding, or it is encapsulated in an injection mold to form the brush body. In this embodiment, the layer of soft elastic material is disposed inside the brush and is not visible to the outside. Their function is to form a perfect seal on the back of the carrier plate. This seal is useful on the one hand in the use of the brush, especially as a toothbrush, as it prevents any ingress of moisture or foreign bodies into the interior of the brush. Particularly useful is the seal through the layer of soft elastic material when the carrier plate is encapsulated to form the brush body in an injection mold with plastic compound. During this process, care must be taken that the injected plastic mass does not penetrate into the bundle holes, which results in a critical injection pressure. By sealing the bundle holes with the layer of soft elastic material, the injection pressure is easy to control. According to a further aspect of the invention there is provided a method of manufacturing brushes in which the fiber bundles are also secured to a support plate by fusing the attachment ends and the support plate has at least one additional hole or recess in addition to the bundle holes. The further hole or the recess can be used both for molding a soft elastic element and for the later attachment of separately manufactured parts such as so-called. Stimulators. In any case, it is ensured that the melt of the fiber bundles does not close the further hole or the recess. This is achieved by limiting the flow of the melt by means of suitably shaped edge contours on the support platelets, borders on a heated stamp used for melting or by means of a mask.
Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der folgenden Beschreibung mehrerer Ausführungsformen unter Bezugnahme auf die Zeichnungen. In den Zeichnungen zeigen:Further features and advantages of the invention will become apparent from the following description of several embodiments with reference to the drawings. In the drawings show:
Fig. 1 verschiedene Schritte einer ersten Ausführungsform des Herstellungsverfahrens in Draufsicht;Figure 1 shows various steps of a first embodiment of the manufacturing process in plan view.
Fig. 2 dieselben Schritte der ersten Ausführungsform des Herstellungsverfahrens in Perspektiδvansicht von der Vorderseite; Fig. 3 dieselben Schritte der ersten Ausführungsform des Herstellungsverfahrens in Perspektiδvansicht von der Rückseite;FIG. 2 shows the same steps of the first embodiment of the manufacturing method in perspective view from the front side; FIG. 3 shows the same steps of the first embodiment of the manufacturing method in perspective view from the rear side;
Fig. 4 verschiedene Schritte einer zweiten Ausführungsform des Herstellungsverfahrens in Draufsicht;4 different steps of a second embodiment of the manufacturing method in plan view;
Fig. 5 dieselben Schritte der zweiten Ausführungsform des Herstellungsver- fahrens in Perspektiδvansicht von der Vorderseite;5 shows the same steps of the second embodiment of the production method in perspective view from the front side;
Fig. 6 dieselben Schritte der zweiten Ausführungsform des Herstellungsverfahrens in Perspektiδvansicht von der Rückseite;FIG. 6 shows the same steps in the second embodiment of the production method in perspective view from the rear side; FIG.
Fig. 7 bis 9 dieselben Schritte der ersten Ausführungsform bei einer anderen Bürste; Fig. 10 bis 12 dieselben Schritte der zweiten Ausführungsform bei einer anderen Bürste; undFigures 7 to 9 the same steps of the first embodiment in another brush. Figures 10 to 12 the same steps of the second embodiment in another brush. and
Fig. 13 eine schematische Perspektivansicht zur Veranschaulichung eines besonderen Aspekts der Erfindung. Vier Schritte einer ersten Ausführungsform des erfindungsgemäßen Verfahrens zur Herstellung einer Bürste, hier einer Zahnbürste, sind in Figur 1 a bis d dargestellt. Figur 1a ist die Draufsicht eines Trägerplättchens 10 aus Kunststoff, das eine Gruppe von Bündellöchern 12 aufweist, deren Anordnung einem gewünschten Borstenbild entspricht. Zusätzlich zu diesen Bündellöchern 12 sind weitere Löcher 14 vorhanden, die eine besondere Bestimmung haben. Das Trä- gerplättchen 10 hat eine allgemein ovale Form entsprechend dem Kopf einer Zahnbürste. Es kann durch Spritzgießen hergestellt werden.Fig. 13 is a schematic perspective view for illustrating a particular aspect of the invention. Four steps of a first embodiment of the method according to the invention for producing a brush, in this case a toothbrush, are shown in FIGS. 1 a to d. FIG. 1a is a plan view of a plastic carrier sheet 10 having a group of bundle holes 12 whose arrangement corresponds to a desired bristle pattern. In addition to these bundle holes 12, there are further holes 14 which have a particular designation. The carrier plate 10 has a generally oval shape corresponding to the head of a toothbrush. It can be made by injection molding.
In die Bündellöcher 12 des Trägerplättchens 10 werden Faserbündel 16 eingeführt, deren Befestigungsenden auf der Rückseite des Trägerplättchens ge- schmolzen werden, um die Faserbündel an dem Trägerplättchen zu befestigen. Das Trägerplättchen 10 mit den daran befestigten Faserbündeln 16 ist in den Figuren 1 b, 2b und 3b dargestellt. Man erkennt, daß die speziellen Löcher 14 unbestückt sind. Die Figur 3b zeigt, daß die geschmolzenen Befestigungsenden der Faserbündel 16 eine durchgehende Schicht 17 auf der Rückseite des Trä- gerplättchens 10 bilden. In dieser durchgehenden Schicht 17 der Schmelze sind Flächenbereiche ausgespart, die den speziellen Löchern 14 entsprechen, so daß diese frei von Schmelze bleiben. Dies kann auf verschiedene Weise erreicht werden. Eine erste Maßnahme besteht darin, das Trägerplättchen 10 mit Schmelzrändern auszuführen, die den Bereich abgrenzen, in den die Schmelze fließen kann. Eine weitere Möglichkeit besteht darin, zum Schmelzen einen Heizstempel zu benutzen, dessen mit den Faserenden in Berührung kommende Flächen Randkonturen aufweisen, die den Fluß der Schmelze begrenzen. Eine weitere Möglichkeit besteht darin, eine Maske über das Trägerplättchen zu legen, wobei diese Maske geeignet gestaltete Ränder aufweist, die den Fluß der Schmelze begrenzen. Weiter unten wird unter Bezugnahme auf Figur 13 eine Ausführungsform beschrieben, bei der eine solche Maske zum Einsatz kommt.Fiber bundles 16 are inserted into the bundle holes 12 of the carrier plate 10, the attachment ends of which are melted on the back side of the carrier plate in order to fasten the fiber bundles to the carrier plate. The carrier plate 10 with the fiber bundles 16 fastened thereto is shown in FIGS. 1 b, 2 b and 3 b. It can be seen that the special holes 14 are unpopulated. FIG. 3b shows that the molten attachment ends of the fiber bundles 16 form a continuous layer 17 on the rear side of the carrier plate 10. In this continuous layer 17 of the melt surface areas are recessed, which correspond to the specific holes 14, so that they remain free of melt. This can be achieved in different ways. A first measure is to make the carrier plate 10 with melt edges which delimit the area into which the melt can flow. Another possibility is to use a heating punch for melting, which come into contact with the fiber ends surfaces edge contours that limit the flow of the melt. Another possibility is to place a mask over the carrier plate, this mask having suitably shaped edges which limit the flow of the melt. Below, an embodiment using such a mask will be described with reference to FIG.
In den Figuren 1c, 2c und 3c ist das Trägerplättchen mit den daran befestigten Faserbündeln mit dem Kopf eines Bürstenkörpers 18 verbunden. Die Verbin- dung des Trägerplättchens mit dem Bürstenkörper kann auf zweierlei Weise erfolgen. Bei einer ersten Variante wird der Bürstenkörper gesondert hergestellt und mit einer Ausnehmung versehen, in die das Trägerplättchen mit den daran befestigten Faserbündeln eingesetzt wird. Anschließend wird das Trägerplätt- chen mit dem Kopfbereich des Bürstenkörpers verschweißt, um eine unlösbare Verbindung herzustellen. Gemäß einer zweiten Variante wird das Trägerplättchen mit den daran befestigten Faserbündeln in eine Spritzgießform eingebracht und mit Kunststoff umspritzt, wodurch Kopf und Stiel des Bürstenkörpers geformt werden. Bei beiden Varianten bleiben die speziellen Löcher 14 zumindest weit- gehend frei. Wie in Figur 3c zu erkennen ist, gehen die speziellen Löcher 14 bis zur Rückseite des Bürstenkopfes durch, da der Bürstenkörper im Kopfbereich entsprechende Ausnehmungen hat. Femer ist der Bürstenkörper auf der Rückseite seines Kopfbereichs mit einer flachen Ausnehmung 20 versehen.In FIGS. 1c, 2c and 3c, the carrier plate with the fiber bundles attached thereto is connected to the head of a brush body 18. The connection Forming the carrier plate with the brush body can be done in two ways. In a first variant of the brush body is made separately and provided with a recess into which the carrier plate is inserted with the attached fiber bundles. Subsequently, the carrier wafer is welded to the head region of the brush body in order to produce a non-detachable connection. According to a second variant, the carrier plate is introduced with the fiber bundles attached thereto in an injection mold and molded with plastic, whereby the head and stem of the brush body are formed. In both variants, the special holes 14 remain at least largely free. As can be seen in Figure 3c, go through the special holes 14 to the back of the brush head, since the brush body has corresponding recesses in the head area. Furthermore, the brush body is provided with a flat recess 20 on the back of its head region.
Der Bürstenkörper 18 mit daran befestigtem Trägerplättchen 10, wie in den Figuren 1c, 2c und 3c dargestellt, wird anschließend in eine Spritzgießform eingebracht, um in einem weiteren Herstellungsschritt eine weichelastische Masse, ein Elastomer wie TPE oder dergleichen, durch die speziellen Löcher 14 und geeignete Kavitäten einzuspritzen, so daß stiftförmige Elemente 22 aus weichelastischem Material in den Löchern 14 verankert werden. Diese weichelasti- sehen Elemente 22 sind Bestandteil des Borstenfeldes und befinden sich bei der hier gezeigten Ausführungsform an den beiden Längsrändern des Bürstenkopfes. Zugleich mit den weichelastischen Elementen 22 wird die weichelastische Masse in die Ausnehmung 20 an der Rückseite des Bürstenkopfes gespritzt, so daß eine durchgehende Schicht 24 aus weichelastischem Material entsteht, welche die gesamte Ausnehmung 20 ausfüllt und durch die Löcher 14 hindurch mit den weichelastischen Elementen 22 einteilig verbunden ist. Die Schicht 24 aus weichelastischem Material nimmt somit die Rückseite des Bürstenkopfes ein und kann beispielsweise die Funktion eines Zungenreinigers haben. Ihre Funktion kann aber auch lediglich darin bestehen, der Bürste eine besondere Optik oder Haptik zu verleihen. Die weichelastischen Elemente 22 haben insbesondere eine Reinigungs- oder Massagefunktion.The brush body 18 with attached carrier plate 10, as shown in Figures 1c, 2c and 3c, is then introduced into an injection mold, in order to produce in a further manufacturing step, a soft elastic mass, an elastomer such as TPE or the like, through the special holes 14 and suitable To inject cavities so that pin-shaped elements 22 are made of soft elastic material anchored in the holes 14. These soft-elastic elements 22 are part of the bristle field and are in the embodiment shown here at the two longitudinal edges of the brush head. Simultaneously with the soft elastic elements 22, the soft elastic mass is injected into the recess 20 at the back of the brush head, so that a continuous layer 24 of soft elastic material is formed, which fills the entire recess 20 and through the holes 14 with the soft elastic elements 22 in one piece connected is. The layer 24 of soft elastic material thus occupies the back of the brush head and can, for example, have the function of a tongue cleaner. Their function can only be to give the brush a special look or feel. The soft elastic elements 22 have in particular a cleaning or massage function.
Die Schicht 24 aus weichelastischem Material muß nicht notwendig in eine Ausnehmung des Bürstenkopfes eingebracht werden. Falls keine Ausnehmung 20 vorhanden ist, wird die Schicht 24 erhaben auf der Rückseite des Bürstenkopfes aufgebracht und hat dieselbe Funktion.The layer 24 of soft elastic material does not necessarily have to be introduced into a recess of the brush head. If no recess 20 is present, the layer 24 is raised on the back of the brush head and has the same function.
Bei der in den Figuren 4, 5 und 6 gezeigten zweiten Ausführungsform sind die ersten Verfahrensschritte identisch und werden daher nicht erneut beschrieben. Bei dem in den Figuren 4c, 5c und 6c dargestellten Schritt werden die weichelastischen Elemente 22a unmittelbar an dem Trägerplättchen 10a angespritzt. Dabei wird auf der Rückseite des Trägerplättchens 10a eine durchgehende Schicht 24a aus weichelastischem Material gebildet, welche die im vorausgegangenen Schritt gebildete Schicht 17a aus geschmolzenen Befestigungsenden der Faserbündel vollständig abdeckt. In dem darauffolgenden Schritt, der in den Figuren 4d, 5d und 6d dargestellt ist, wird das Trägerplättchen 10a mit den daran befestigten Faserbündeln 16a, weichelastischen Elementen 22a und der Schicht 24a aus weichelastischem Material an einem Bürstenkörper 18a befestigt. Wie bei der zuvor beschriebenen Ausführungsform kann dies auf zweierlei Weise erfolgen, zum einen durch Befestigen des Trägerplättchens an einem getrennt hergestellten Bürstenkörper, zum anderen durch Umspritzen des Trägerplättchens mit dem Material, aus dem Stiel und Kopf des Bürstenkörpers gespritzt werden.In the second embodiment shown in FIGS. 4, 5 and 6, the first method steps are identical and will therefore not be described again. In the step illustrated in FIGS. 4c, 5c and 6c, the soft-elastic elements 22a are injection-molded directly onto the carrier plate 10a. In this case, a continuous layer 24a of soft elastic material is formed on the back of the carrier plate 10a, which completely covers the layer 17a of molten attachment ends of the fiber bundles formed in the previous step. In the subsequent step, illustrated in Figures 4d, 5d and 6d, the carrier plate 10a with the fiber bundles 16a, soft elastic elements 22a and the soft elastic material layer 24a attached thereto is attached to a brush body 18a. As in the embodiment described above, this can be done in two ways, be injected by attaching the carrier plate to a separately prepared brush body, on the other hand by molding the carrier plate with the material from the stem and head of the brush body.
Bei der vorstehend beschriebenen Ausführungsform liegt die Schicht 24a aus weichelastischem Material im Inneren des Bürstenkopfes zwischen der Schicht 17a und einer Innenwand des Bürstenkopfes. Die Schicht 24a hat hier hauptsächlich die Funktion einer Dichtung. Sie bildet insbesondere eine perfekte Abdichtung der Bündellöcher 12a sowohl gegen Eindringen von Feuchtigkeit oder Fremdkörpern von außen in das Innere des Bürstenkopfes als auch gegen plastische Masse des Bürstenkörpers beim Umspritzen des Trägerplättchens unter hohem Spritzdruck.In the above-described embodiment, the soft elastic material layer 24a inside the brush head is sandwiched between the layer 17a and an inner wall of the brush head. The layer 24a has here mainly the function of a seal. In particular, it forms a perfect seal of the bundle holes 12a both against penetration of moisture or foreign bodies from the outside into the interior of the brush head and against plastic mass of the brush body during the injection molding of the carrier plate under high injection pressure.
Die Figuren 7, 8 und 9 zeigen eine Variante der ersten Ausführungsform des Verfahrens und entsprechen daher weitgehend den Figuren 1 , 2 und 3. Unterschiedlich ist lediglich die Bürste, insbesondere das Borstenfeld mit einem integrierten weichelastischen Element. Dieses weichelastische Element 22b ist in Draufsicht allgemein kreuzförmig und befindet sich in der Mitte des Borstenfeldes. Entsprechend hat das Trägerplättchen 10b in seiner Mitte eine Aussparung 14b, in der das weichelastische Element 22b verankert wird. Die Herstellung er- folgt in gleicher Weise wie in den Figuren 1 , 2 und 3 dargestellt und wird daher nicht erneut beschrieben.Figures 7, 8 and 9 show a variant of the first embodiment of the method and therefore largely correspond to Figures 1, 2 and 3. Different is only the brush, in particular the bristle field with an integrated soft elastic element. This soft elastic element 22b is generally cross-shaped in plan view and is located in the middle of the bristle field. Accordingly, the support plate 10b has in its center a recess 14b, in which the soft elastic element 22b is anchored. The production follows in the same way as shown in Figures 1, 2 and 3 and is therefore not described again.
Die in den Figuren 10, 11 und 12 dargestellten Verfahrensschritte zur Herstellung einer Zahnbürste folgen der zweiten Ausführungsform des Verfahrens und entsprechen somit den Figuren 4, 5 und 6, zeigen jedoch eine Variante einer Zahnbürste, die in den Figuren 7, 8 und 9 gezeigt ist. Die in den Figuren 10, 11 und 12 gezeigten Verfahrensschritte werden daher nicht erneut beschrieben.The method steps for producing a toothbrush illustrated in FIGS. 10, 11 and 12 follow the second embodiment of the method and thus correspond to FIGS. 4, 5 and 6, but show a variant of a toothbrush shown in FIGS. 7, 8 and 9 , The process steps shown in FIGS. 10, 11 and 12 will therefore not be described again.
Die Figur 13 zeigt die Verwendung einer Maske 28 zur Begrenzung des Flusses der Schmelze, die erzeugt wird, wenn die Befestigungsenden der Faserbün- del mit der erhitzten Fläche eines Stempels 30 in Kontakt kommen, in einer Ausführungsform der Bürste, die der in den Figuren 7, 8 und 9 oder 10, 11 und 12 entspricht. Die Maske 28 hat einerseits einen Rand, der den Außenrand der geschmolzenen Schicht begrenzt, und andererseits einen Inselbereich 32, der den Bereich um die Aussparung 14b des Trägerplättchens 10 begrenzt. Die Maske 28 wird als Platte beispielsweise aus Stahl hergestellt.FIG. 13 shows the use of a mask 28 for limiting the flow of the melt, which is generated when the attachment ends of the fiber bundles come into contact with the heated surface of a punch 30, in one embodiment of the brush, which is the one shown in FIGS , 8 and 9 or 10, 11 and 12 corresponds. The mask 28 has, on the one hand, an edge which bounds the outer edge of the molten layer and, on the other hand, an island region 32 which delimits the region around the recess 14b of the carrier plate 10. The mask 28 is made as a plate, for example made of steel.
Die beschriebenen Maßnahmen, durch die bestimmte Löcher oder Aussparungen in den Trägerplättchen zumindest weitgehend freigehalten werden, können nicht nur dem Zweck dienen, weichelastische Elemente spritztechnisch zu integrieren. Vielmehr sind auch Ausführungsformen beabsichtigt, bei denen ge- trennt gefertigte Teile nachträglich in den freigelassenen Löchern, Aussparungen oder Öffnungen angebracht werden.The described measures by which certain holes or recesses in the carrier plates are at least largely kept free can not only serve the purpose of integrating flexible elements by injection molding. Rather, embodiments are also intended in which separately manufactured parts are subsequently applied in the released holes, recesses or openings.
Auf gleiche Art und Weise kann eine Maske 28 verwendet werden, wenn das Trägerplättchen nur gewöhnliche Bündellöcher und keine speziellen Löcher oder Ausnehmungen für weichelastische Elemente oder dergl. hat. In diesem Fall be- grenzt die Maske 28 nur den Außenrand der Schmelze. Hierdurch ist es möglich, völlig flache Trägerplättchen zu verwenden, die keinen angeformten erhabenen Begrenzungsrand für die Schmelze haben, wie z.B. in Fig. 12a gezeigt. In a similar manner, a mask 28 may be used if the carrier plate has only ordinary bundle holes and no special holes or recesses for soft-elastic elements or the like. In this case, the mask 28 limits only the outer edge of the melt. This makes it possible to use completely flat carrier plates which do not have an integrally formed raised boundary for the melt, such as e.g. shown in Fig. 12a.

Claims

Patentansprüche claims
1. Verfahren zur Herstellung von Bürsten, insbesondere Zahnbürsten, bei dem a) Trägerplättchen mit Löchern für Faserbündel und wenigstens einem1. A method for producing brushes, in particular toothbrushes, in which a) carrier plates with holes for fiber bundles and at least one
Loch oder einer Aussparung für ein weichelastisches Element hergestellt werden; b) die Faserbündel in die Löcher eingeführt werden; c) die aus den Löchern austretenden Befestigungsenden der Faserbün- del durch Verschmelzen an dem Trägerplättchen befestigt werden, wobei das Loch bzw. die Aussparung für ein weichelastisches Element von Schmelze zumindest weitgehend freigehalten wird; d) das weichelastische Element hergestellt wird durch Spritzen von weichelastischem Material in einer Spritzgießform durch das Loch bzw. die Aussparung unter Bildung einer Schicht des weichelastischen Materials auf der Seite der verschmolzenen Befestigungsenden der Faserbündel; e) das Trägerplättchen vor oder nach dem Spritzen des weichelastischen Materials mit einem Bürstenkörper vereinigt wird. Hole or a recess are made for a soft elastic element; b) the fiber bundles are inserted into the holes; c) the attachment ends of the fiber bundles emerging from the holes are secured to the carrier plate by fusing, wherein the hole or the recess for a soft-elastic element is at least largely kept free of melt; d) the soft elastic element is made by injecting soft elastic material in an injection mold through the hole to form a layer of the soft elastic material on the side of the fused attachment ends of the fiber bundles; e) the carrier plate is combined before or after spraying the soft elastic material with a brush body.
2. Verfahren nach Anspruch 1 , bei dem die Vereinigung des Trägerplätt- chens mit dem Bürstenkörper vor dem Spritzen des weichelastischen Materials erfolgt, der Bürstenkörper das Loch bzw. die Aussparung zum Einspritzen des weichelastischen Materials zumindest teilweise freiläßt und die Schicht des weichelastischen Materials auf der von den Faserbündeln abgewandten Rücksei- te des Bürsten körpers angebracht wird.2. The method of claim 1, wherein the union of the Trägerplätt- Chen with the brush body before spraying the soft elastic material, the brush body at least partially leaves the hole or recess for injecting the soft elastic material and the layer of soft elastic material on the The rear side of the brush body facing away from the fiber bundles is attached.
3. Verfahren nach Anspruch 2, bei dem die Schicht aus weichelastischem Material in eine flächige Aussparung des Bürstenkörpers eingelagert wird.3. The method of claim 2, wherein the layer of soft elastic material is embedded in a flat recess of the brush body.
4. Verfahren nach Anspruch 2 oder 3, bei dem der Bürstenkörper als separates Teil hergestellt wird, mit dem das Trägerplättchen durch Schweißen, Kleben oder dergl. verbunden wird.4. The method of claim 2 or 3, wherein the brush body is made as a separate part, with which the carrier plate by welding, gluing or the like. Is connected.
5. Verfahren nach Anspruch 2 oder 3, bei dem der Bürstenkörper durch Umspritzen des Trägerplättchens mit diesem verbunden wird. 5. The method of claim 2 or 3, wherein the brush body is connected by encapsulation of the carrier plate with this.
6. Verfahren nach Anspruch 1 , bei dem die Vereinigung des Trägerplätt- chens mit dem Bürstenkörper nach dem Spritzen des weichelastischen Materials erfolgt und die Schicht des weichelastischen Materials die verschmolzenen Befestigungsenden der Faserbündel abdeckt. 6. The method of claim 1, wherein the union of the Trägerplätt- Chen with the brush body after spraying the soft elastic material takes place and the layer of soft elastic material covering the fused attachment ends of the fiber bundles.
7. Verfahren nach Anspruch 6, bei dem der Bürstenkörper als separates7. The method of claim 6, wherein the brush body as a separate
Teil hergestellt wird, mit dem das Trägerplättchen durch Schweißen, Kleben oder dergl. verbunden wird, wobei die Schicht aus weichelastischem Material an einer Innenfläche des Bürstenkörpers anliegt.Part is made, with which the carrier plate is joined by welding, gluing or the like, wherein the layer of soft elastic material rests against an inner surface of the brush body.
8. Verfahren nach Anspruch 6, bei dem der Bürstenkörper durch Umsprit- zen des Trägerplättchens und der Schicht aus weichelastischem Material mit beiden verbunden wird.8. The method of claim 6, wherein the brush body is connected by overmolding the carrier plate and the layer of soft elastic material with both.
9. Verfahren zur Herstellung von Bürsten, insbesondere Zahnbürsten, bei dem a) Trägerplättchen mit Löchern für Faserbündel und wenigstens einem weiteren Loch oder einer Aussparung hergestellt werden; b) die Faserbündel in die Löcher eingeführt werden; c) die aus den Löchern austretenden Befestigungsenden der Faserbündel durch Verschmelzen an dem Trägerplättchen befestigt werden, wobei das weitere Loch bzw. die Aussparung von Schmelze zumin- dest weitgehend freigehalten wird durch Begrenzen des Flusses der9. A method for producing brushes, in particular toothbrushes, in which a) carrier plates are produced with holes for fiber bundles and at least one further hole or a recess; b) the fiber bundles are inserted into the holes; c) the fastening ends of the fiber bundles emerging from the holes are fastened to the support plate by fusing, wherein the further hole or the recess of melt is at least largely kept free by limiting the flow of the melt
Schmelze mittels Randkonturen am Trägerplättchen, Umrandungen an einem zum Verschmelzen verwendeten erhitzten Stempel oder mittels einer Maske; d) das Trägerplättchen mit einem Bürstenkörper vereinigt wird. Melt by means of edge contours on the carrier plate, borders on a heated stamp used for fusing or by means of a mask; d) the carrier plate is combined with a brush body.
10. Bürste, insbesondere Zahnbürste, mit einem Bürstenkörper und einem daran befestigten Trägerplättchen, an dem Faserbündel durch Verschmelzen der in Löcher des Trägerplättchens eingeführten Befestigungsenden der Faserbündel befestigt sind und an dem wenigstens ein weichelastisches Element durch Anspritzen befestigt ist, dessen Material ein Loch oder eine Aussparung des Träger- plättchens durchdringt und auf der von den Faserbündeln abgewandten Rückseite des Trägerplättchens eine weichelastische Materialschicht bildet, die durch das Loch oder die Aussparung hindurch mit dem weichelastischen Element verbunden ist. 10. Brush, in particular toothbrush, with a brush body and a carrier plate attached thereto, are fastened to the fiber bundle by merging the introduced into holes of the carrier plate attachment ends of the fiber bundles and to which at least one soft elastic element is attached by injection, the material is a hole or a Recess of the carrier plate penetrates and forms on the side facing away from the fiber bundles back of the carrier plate a soft elastic material layer which is connected through the hole or the recess with the soft elastic element.
11. Bürste nach Anspruch 10, bei der die weichelastische Materialschicht an der von den Faserbündeln abgewandten Rückseite des Bürstenkörpers angeordnet ist und der Bürstenkörper wenigstens einen Durchbruch aufweist, durch den hindurch sich das weichelastische Material bis zu dem weichelastischen Element auf der Seite der Faserbündel erstreckt.11. A brush according to claim 10, wherein the soft elastic material layer is disposed on the side facing away from the fiber bundles back of the brush body and the brush body has at least one opening through which the soft elastic material extends to the soft elastic element on the side of the fiber bundles.
12. Bürste nach Anspruch 11 , bei der die weichelastische Materialschicht in eine flache Ausnehmung an der Rückseite des Bürstenkörpers eingelagert ist.12. A brush according to claim 11, wherein the soft elastic material layer is embedded in a shallow recess at the back of the brush body.
13. Bürste nach Anspruch 10, bei der die weichelastische Materialschicht unmittelbar auf den eine Schicht bildenden verschmolzenen Befestigungsenden der Faserbündel aufliegt und auf der von den Faserbündeln abgewandten Rückseite von einer Wand des Bürstenkörpers abgedeckt ist. 13. Brush according to claim 10, wherein the soft elastic material layer rests directly on the one layer forming fused attachment ends of the fiber bundles and is covered on the side facing away from the fiber bundles back of a wall of the brush body.
EP09777899.7A 2008-08-26 2009-08-14 Method for producing brushes, particularly toothbrushes Active EP2337474B1 (en)

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Also Published As

Publication number Publication date
KR20110056381A (en) 2011-05-27
WO2010025820A3 (en) 2010-05-27
CN102159115A (en) 2011-08-17
EP2337474B1 (en) 2014-09-17
CN102159115B (en) 2014-12-24
WO2010025820A2 (en) 2010-03-11
DE102008039778A1 (en) 2010-03-04

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