EP3348169A1 - 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
EP3348169A1
EP3348169A1 EP17208451.9A EP17208451A EP3348169A1 EP 3348169 A1 EP3348169 A1 EP 3348169A1 EP 17208451 A EP17208451 A EP 17208451A EP 3348169 A1 EP3348169 A1 EP 3348169A1
Authority
EP
European Patent Office
Prior art keywords
cavity
thickening
bristle
carrier
bristle bundle
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
EP17208451.9A
Other languages
German (de)
English (en)
Other versions
EP3348169B1 (fr
Inventor
Thomas Clos
Markus Ibrom
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.)
M&C Schiffer GmbH
Original Assignee
M&C Schiffer GmbH
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
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Application filed by M&C Schiffer GmbH filed Critical M&C Schiffer GmbH
Publication of EP3348169A1 publication Critical patent/EP3348169A1/fr
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Publication of EP3348169B1 publication Critical patent/EP3348169B1/fr
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Classifications

    • 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 manufacturing a brush with the preamble features of claim 1 and an apparatus for manufacturing a brush with the preamble features of claim 12.
  • Such a method and apparatus are known from DE 196 04 533 A1 known.
  • a bristle bundle to be fastened to a carrier is inserted into a bore of a carrier element and then fused at its attachment-side end to form a thickening.
  • the thickening is encapsulated after solidification with liquid plastic, which forms the carrier.
  • This prior art method is used to bond bristle bundles of a brush or a single bundle of bristles of an interdental brush to the carrier without any ties.
  • the carrier can form the handle of the brush as a whole, or only a part of the same.
  • the bristle bundle When connecting a bristle bundle to the carrier without anchoring, the bristle bundle is inserted with its attachment-side end into a mold, which is then filled with the plastic molten.
  • the plastic is injected by means of injection molding.
  • the aforementioned carrier element usually forms a boundary of the mold cavity.
  • the carrier element is regularly provided as a plate-shaped element and is used to complete a mold half of the injection mold in this.
  • a method is known in which initially a bristle carrier is prepared separately and is melted at the same time with fixing side ends of a bristle bundle. The so liquefied and connected elements are joined.
  • a joining element holding the bristle bundle not only presses the bundle of bristles into the recess of the carrier. Rather, a crater edge pushed out during the melting process by forming it first out of the plane of the carrier usually penetrated by the bristle bundles is brought into contact with the thickening produced by the melting during the introduction of the bristle bundle, whereby the bundles of bristles should be fastened to the support with good pull-out strength.
  • This methodical approach is on the one hand expensive.
  • the present invention is based on the problem to provide a method for producing a brush, which may have a small thickness and in which the bristle bundle is held with the necessary pullout strength with good parallel alignment of the bristle filaments of a bristle bundle.
  • the present invention also seeks to specify a device suitable for carrying out the method.
  • a cavity provided with a hollow cavity on the fused ends of the bristle bundle, in such a way that the cavity at least partially absorbs the thickening in itself.
  • a chamber is formed in which the melted filament material is formed.
  • a Verdrfiterst Zi is pressed against the thickening in the inventive procedure.
  • the displacer is accordingly provided so 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 displacer presses against the fused end, so that the filament material forming the thickening is displaced, for example urged against the hollow punch or a surface of the support element, and solidifies there.
  • a targeted forming of the molten filament material is achieved within the cavity.
  • the fused filament material can be pressed defined against the surface of the support element.
  • the bristle bundle can be melted in a separate station on the mounting side and only then transferred with an already thickened thickening in a station in which the melted thickening is deformed on the hollow die and the positive displacement punch.
  • the positive displacement can serve as a heat source, which initially melts when approaching the end of the bristle bundle, for example by switching on a heat source, which is provided on the Verdrnatureerstempel. Thereafter, the heat source is turned off, so that the displacer with displaced melt displaces the filament material in the cavity, preferably pressed into a specific shape.
  • identical or divergent filaments can be realized on a bundle of bristles and / or to form different bundles of bristles.
  • At least one bristle bundle can be made of conventional material, regularly stretched polyamide. But at least one bristle bundle can also be realized as a soft-elastic cleaning element.
  • the filament material is preferably reshaped such that a plug formed from the melt is forced 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 to stabilize in their parallel alignment.
  • the transition between the non-melted filament and the fused filament then lies with sufficient distance to the surface of the support element.
  • the cavity defines a chamber which restricts the mobility of the fused filament material during forming by the displacer.
  • the chamber also preferably acts as a kind of die against which the molten material is fully applied to achieve some compression of the molten material within the cavity.
  • the hollow punch is preferably applied against the carrier element, before the displacer presses against the thickening.
  • the cavity is completely filled by the filament material displaced by the displacer, i. from the previously prepared melt. In order to achieve a secure compaction of the filament material within the cavity, however, according to a preferred embodiment of the present invention, it is proposed that the displacer push the filament material out of the cavity.
  • the hollow punch has openings, through which the filament material can be forced out of the cavity, in particular at its end resting against the carrier element.
  • a bead can be formed on the carrier element, which allows the emergence of filament material from the cavity at excessive internal pressure in the cavity.
  • the thickening specifically shaped in this way can - as in the prior art - be used in an injection mold and be encased in a plastic material forming the carrier in order to both form the carrier and at the same time to connect the bristle bundle to the carrier. Due to the hollow punch and the displacer but the thickening can be impressed on a specific geometric design. Thus, the thickening can be formed with its outer contour adapted to the outer contour of a bore within the carrier. Thus, a bristle bundle prepared in this way or a plurality of bristle bundles can be pressed into the corresponding bore and fastened thereto.
  • Forming and / or locking elements may be formed on the outer surface of the thickening in order to fasten the bristle bundle or a plurality of bristle bundles to the support in the manner of a bayonet closure. It is also possible to form the thickening frustoconical, wherein the smaller diameter portion can form the attachment-side end of the thickening and the bristle bundle.
  • the carrier may have a corresponding frusto-conical contour, so that the bristle bundle can be fixed by pressing into the cone on the support. At the thickening and ribs may protrude, which cooperate with corresponding grooves of the carrier in order to hold the bristle bundle against rotation.
  • filament material preferably the entire filament material which forms the thickening
  • several bristle bundles to arrange their attachment-side ends in a single cavity and to connect the melt droplets formed by the individual bristle bundles by the acting Verdrnatureerstempel with each other.
  • This can be formed from the filament of this bristle bundle a bundle connecting all bundles of bristles, which determines the bristle bundles with a predetermined orientation to each other in the solidified state and preferably fixed all filaments of each bristle bundle in a predetermined orientation relative to each other.
  • the foundation has a contour corresponding to the contour of the carrier element in the region of the bristle bundles receiving holes.
  • the foundation is also usually formed against a surface of the support member by the displacer pressing the filamentary material against that surface.
  • the foundation has a contour corresponding to the surface of the carrier element in the region of the bores.
  • This contour can be convex or concave.
  • the holes diverge starting from the recess to the outside, so that the bristle bundles held and guided in the bores form a spherical segment-shaped envelope surface after removal from the carrier element on the finished brush.
  • the bristle bundles protrude from a spherical or otherwise convex surface of the bristle carrier, as in a hedgehog. If the bristle bundles are each provided with the same length, then all the use-side ends of the bundles of bristles span a spherical-segment-shaped enveloping surface.
  • the bundles of bristles are of different lengths, their use-side ends lie in a spherical-segment-shaped covering plane, which has a certain extent in the longitudinal direction of the bristle bundles, corresponding to the difference between the shortest and the longest bundles of bristles.
  • the channels converge with the result that the use-side ends of different bristle bundles are provided closer to one another than their attachment-side ends.
  • a compacted cleaning-active surface on the brush can be provided by different bristle bundles.
  • bristle bundles of different filament diameters and / or physical nature can be combined to provide different cleaning characteristics in a concentrated area.
  • the carrier element can be installed in the injection mold to complete an injection mold and to limit the mold cavity formed thereby.
  • This variant of the method according to the invention is the standard case.
  • a carrier element in the sense of the present invention may also be a member provided with bores, which is merely for preparation the bristle bundle is used while the connection between the plastic forming the carrier and the bundle of bristles takes place without the corresponding carrier element.
  • the carrier element is usually formed plate-shaped, wherein the previously discussed recess or more thereof may be realized differently from the planar configuration of the carrier element.
  • Such a substantially plate-shaped carrier element is also referred to in the prior art as a perforated field plate.
  • perforated field plate can be used to prepare the bristle bundles, which reduces the investment cost for performing the method.
  • the support produced by the process according to the invention can for example form the main body of a brush, which is encapsulated in a subsequent injection cycle with a further or third component to form soft elastic cleaning elements and / or handle pads or other colored areas for decoration purposes, in particular of a soft elastic material.
  • the soft-elastic material may in particular be a thermoplastic elastomer.
  • a plurality of carrier elements can be circulated for preparation on a separate path, as is the case from the generic one EP 0 405 204 A2 is known.
  • the carrier elements prepared in this way are stuffed with the bristle bundles on the separate route.
  • the bundles of bristles can be contoured in a manner known per se, i. Filaments of a bristle bundle are axially displaced to place the utilization-side ends of the filaments of a bristle bundle at different planes perpendicular to the longitudinal extent of the filaments.
  • the thickening is produced by melting and forming by means of positive displacement within the cavity of the hollow punch.
  • the carrier element is usually used directly to complete the injection mold in this. Liquid plastic is used to form the carrier in the injection mold.
  • the device proposed by the independent aspect of the present invention is defined in claim 12.
  • the device has a hollow die which is movable relative to the carrier element and which defines a cavity.
  • the device has a positive displacement plunger which is movable relative to the support element and relative to the hollow plunger.
  • the hollow ram has a recess, via which the displacement ram can be introduced into the cavity.
  • the recess is preferably formed so that the displacement plunger is guided with little play within the hollow punch.
  • the game should be designed so that when displacing and compressing the melted Filament no filament material enters the displacer receiving recess.
  • the heating device for melting the fastening-side end of the bristle bundle can be designed conventionally, as is known EP 0 405 204 A2 is known.
  • a heating device can also be assigned to the hollow punch and / or the positive-displacement punch, by means of which the fixing-side end of the bristle bundle is melted.
  • an infrared light source may be provided on the hollow punch and / or the displacer, which is initially turned on to heat and fuse the fastener-side end of the bundle of bristles before the filament material is displaced or compressed.
  • FIG. 1a schematically shows a sectional view through a support element 2, which has a bore 4 for receiving a bristle bundle 6.
  • the FIGS. 1a to f show different stations of the same support member 2, wherein the support member 2 between the stations 1a, 1b and 1c can be moved.
  • FIG. 1a shows the bundle of bristles 6 after the plugging of the carrier element 2.
  • the bristle bundle 6 projects beyond the carrier element 2 on both sides. It may be supported in the region of its use-side end 8 via a retaining plate in order to arrange fastening-side ends 10 at a distance from a surface 12 of the carrier element 2.
  • FIG. 1b In the in FIG. 1b shown position, the attachment-side end 10 of the bristle bundle 6 is melted by the action of heat 14, so that a melted droplets form as a thickening 16.
  • a hollow punch marked with reference numeral 18 is guided over the thickening 16 in a direction substantially parallel to the longitudinal extension of the bristle bundle 6 ( FIGS. 1c, d ).
  • the hollow ram 18 accommodates a positive displacement ram 20, which is displaceably guided in a receiving bore 22 formed on the hollow ram 18.
  • the displacement direction of the displacer 20 corresponds to the direction of movement of the hollow punch 18th In the FIGS. 1c, d and e the displacer 20 is shown in its initial position.
  • FIG. 1e illustrates the Verdrfiterstkov 20 already when creating the hollow punch 18 against the surface 12 and in its initial position against the thickening 16.
  • a deformation of the thickening 16 is achieved by the Verdrfiterstempel 20 before the hollow die 18 against the surface 12 of the support element. 2 has been created.
  • This position is in Figure 1e shown.
  • the figure also illustrates, however, that a cavity 24 provided in the hollow die 18 has not yet been completely filled with the filament material forming the thickening 16.
  • the displacer 20 in the sequence of Figure 1e to FIG. 1f axially displaced relative to the hollow punch 18. The free volume of the cavity 24 is thereby reduced.
  • the thickening 16 forming filament material is displaced.
  • the hollow die 18 is usually much colder than the temperature of the thickening 16.
  • the heated filament material for melting cooled directly from and solidifies with a predetermined by the outer walls of the cavity 24 contour ,
  • the filament material can also solidify due to the ambient temperature.
  • FIGS. 1a to f is a rectangular cross-sectional area of the cavity 24 illustrates. It goes without saying that any geometry is possible, with embodiments without undercut are to be preferred.
  • the cavity 24 may also be formed hemispherical.
  • the hollow die 18 is withdrawn together with the displacer 20 of the support member 2.
  • the carrier element 2 can now be used to complete an injection mold in this.
  • the support member 2 has a concave recess 28 from which depart a plurality of outwardly diverging holes 4.
  • the recess 28 is presently hemispherical or formed in the manner of a semi-ellipse.
  • the recess 28 starts from a substantially planar carrier element 2 from. 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 each other (cf. Fig. 2a ). These attachment-side ends 10 are in the in FIG. 2b shown state 2c already melted.
  • the carrier element is shown only with its upper-side contour.
  • the carrier element can be similar to the embodiment according to FIG. 1 be designed so that the use-side ends 8 of the bristle bundles 6 project beyond the carrier element 4.
  • a plant tray will be provided, against which the bristle bundles 6 abut on the use side.
  • the carrier element 2 can also be formed with such a thickness that the bristle bundles 6 are accommodated in total in the carrier element 2.
  • the holes 4 may be formed as blind holes, which also specify the axial positioning of the bristle bundles 6 within the holes 4.
  • the holes 4 may be formed as through holes.
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 true EP3348169A1 (fr) 2018-07-18
EP3348169B1 EP3348169B1 (fr) 2021-08-04

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ID=60673981

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Application Number Title Priority Date Filing Date
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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EP (1) EP3348169B1 (fr)
DE (1) DE102017200451B4 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Family Cites Families (2)

* 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
EP0405204B1 (fr) 1989-06-24 1994-09-07 Frisetta GmbH Dispositif et procédé pour façonner une répartition de soies ou une touffe de soies

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
DE102017200451B4 (de) 2021-02-25
EP3348169B1 (fr) 2021-08-04
DE102017200451A1 (de) 2018-07-12

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