EP2587959B2 - Verfahren und vorrichtung zum herstellen von bürsten - Google Patents

Verfahren und vorrichtung zum herstellen von bürsten Download PDF

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Publication number
EP2587959B2
EP2587959B2 EP11730582.1A EP11730582A EP2587959B2 EP 2587959 B2 EP2587959 B2 EP 2587959B2 EP 11730582 A EP11730582 A EP 11730582A EP 2587959 B2 EP2587959 B2 EP 2587959B2
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EP
European Patent Office
Prior art keywords
base component
bristles
cavity
base
opening
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.)
Active
Application number
EP11730582.1A
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German (de)
English (en)
French (fr)
Other versions
EP2587959A1 (de
EP2587959B1 (de
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
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GB Boucherie NV
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Publication date
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Application filed by GB Boucherie NV filed Critical GB Boucherie NV
Publication of EP2587959A1 publication Critical patent/EP2587959A1/de
Application granted granted Critical
Publication of EP2587959B1 publication Critical patent/EP2587959B1/de
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Classifications

    • 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
    • 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 invention relates to a method and a device for producing brushes.
  • a brush body is provided with an arrangement of holes (“hole pattern” or “hole pattern”) that corresponds to the desired arrangement of bristles. Bundles or tufts of bristles are then inserted into the holes in the brush body and anchored therein by means of small metallic anchors or loops.
  • the tufts of bristles are attached to a small one Brush head plate (hereinafter referred to as "base part") is attached without the use of loops or anchors, and the base part is then inserted into or attached to a brush body or a handle.
  • base part Brush head plate
  • brush handles are produced with a hole pattern that corresponds to the desired tuft pattern. Tufts of bristles are then inserted into these holes and attached to the brush handles. The fastening ends of the tufts are then covered with a small plate.
  • This base part becomes part of the brush itself after the injection of plastic material on the back.
  • a metal carrier part (called perforated plate) is used in the bristling machine, which has the same hole pattern as the base part and which serves as a guide and partly holder for the bristle tufts.
  • This carrier part together with the bristled base part, is transported to the injection molding tool and acts there as a section of a mold half which delimits the cavity into which injection is carried out with a second mold half.
  • the bristling machine and the injection molding tool are coupled via the carrier plates with regard to the material flow and are synchronized with one another in terms of timing.
  • the EP 1 864 588 A2 a process for the production of brushes, in which a prefabricated carrier plate is used, to which tufts of bristles are attached.
  • This carrier plate later forms a section of the finished brush.
  • the carrier plate lies in a perforated field plate during manufacture and is inserted together with this perforated field plate into an injection mold in order to inject a brush section onto the back of the carrier plate.
  • the ends of the bristle bundles on the use side lie in a mold cavity of the molding surface of the injection mold and the edge of the carrier plate lies on the edge of the perforated field plate.
  • the DE 10 2005 038 468 A1 shows a partial brush body with bristle bundles, which is inserted into an injection molding device, which has at least one recess for the bristle bundles protruding from the front and in the region of the recess has support means for contacting the brush body.
  • the EP 2 078 472 A1 shows that the brush body and style are already sprayed beforehand and then tufts of bristles are inserted into the finished brush body and fixed on the back by fusing the bristle ends.
  • the lid only has a covering function.
  • the object of the invention is to provide a flexible and inexpensive manufacture of brushes.
  • Injection molding tools are preferably carried out fully automatically.
  • the device according to the invention for producing brushes in particular with a method according to the invention, is characterized by an injection molding tool with a mold half with at least one cavity for receiving a bristled base part, the cavity having a single opening for receiving all tufts of bristles and a supporting edge surrounding the opening for supporting and supporting the base part), wherein the mold half is formed in several parts with the at least one cavity and has a first and a second molded part, both of which have merging sections of the at least one cavity, and wherein the first molded part is separable from the second and as a transport part is formed for the at least one base part.
  • the base part since the base part abuts the mold half on the edge and the latter has an opening inward of the edge, the base part is not supported over the entire surface, but is preferably completely or at least largely not supported inward of the edge.
  • the invention significantly reduces the outlay required for the production of the carrier plates, since the carrier plates no longer migrate to the injection molding tool, as a result of which the clocking cycles of the injection molding tool and the bristling machine no longer necessarily have to be coupled to one another.
  • the method according to the invention thus provides for feeding, positioning and overmolding of the base part free of perforated plates.
  • in the Injection molding tool is no longer a complex perforated plate with numerous openings, the number of which corresponds to the number of openings in the base part.
  • This perforated plate was previously used in the injection mold as a support for the relatively thin base part made of plastic in order to absorb the injection pressure.
  • an opening (preferably a single opening) is provided in a mold half of the injection molding tool in the region of the cavity to be sprayed, into which the several tufts of bristles protrude.
  • the base part preferably lies exclusively or almost exclusively with its peripheral edge on the edge of the opening extending from the cavity and is preferably supported only on this edge.
  • a separate support layer is provided on the back before injection molding, which forms a prefabricated unit with the bristled base part and leads to increased bending rigidity.
  • the other alternative according to the invention provides that the bristle ends of the bristle tufts are first melted together, which is usually done in a perforated plate which is equipped with the bristle tufts and which is expensive to produce. This perforated plate is then transported into an injection mold in order to encapsulate the tufts. The result is a plate-like base part, in which the tufts of bristles are positively and securely embedded at their point of fusion.
  • this base part was also always transported, together with the carrier plate or perforated plate, into a further injection molding tool or a further station of an injection molding tool.
  • the carrier plate was used to support the injection pressure during injection molding of the brush body (head and handle).
  • the present invention provides that these support plates provided with the hole pattern of the brush are no longer provided as support plates in the injection mold when the brush body is manufactured.
  • the base part is now supported at the edge of an opening in a cavity of the mold half.
  • the tufts protrude into the opening, which is very easy to manufacture due to its size.
  • the overmolding of the tufts results in a very stable plate (base part) which can withstand the spray pressure, although here too the base part is not supported or at least largely is not supported inward of the edge.
  • the invention relates to anchoring the manufacture of brushes.
  • the tufts of bristles are not held individually in holes in a perforated plate by a lateral press fit, but protrude freely into the opening of the mold half and are held by the base part.
  • the base part is held in the cavity on the edge.
  • the edge of the base part lies with its closed circumference against the likewise closed circumferential edge of the opening, so that a sealing effect is achieved.
  • the support layer is molded on in a separate device or a station which is passed through in the aforementioned mold half before the final injection molding.
  • the entire production and the entire device can manage with significantly fewer perforated plates.
  • the bristled base parts can also be purchased.
  • the base parts remain support-free in the region of the opening when spraying.
  • punctiform or linear support projections in the opening can press against the base part in order to support it during injection molding.
  • One of the preferred embodiments provides that the support extensions to the base part are tapered, preferably even pointed. In order to they can slide between adjacent bristles without damaging the bristles.
  • the tuft ends protruding on the back are glued or melted, e.g. through hot air, heat radiation or contact heat (pressing on a hot tool).
  • the contacting and flattening of the liquefied tuft ends is advantageous in that a dense, preferably closed surface is made of molten plastic. This tightness is advantageous for later injection molding.
  • the support layer is preferably applied over the entire area, that is to say even over the entire area in the preferred exemplary embodiment. At most the edge of the base part, with which it lies against the mold half, remains uncovered.
  • the support layer can, however, also be formed in that the still unsecured bristle tufts are attached to the base part on the back by extrusion coating by means of the support layer.
  • the step of applying the support layer also serves to secure the tufts to the base part.
  • insertion tool presses the bristles slightly inwards and together in order to achieve an easier insertion of the bristles into the common opening of the mold half. This prevents bristles from sticking to the edge of the opening and kinking.
  • a plurality of cavities are preferably present in the mold half of the device according to the invention in order to increase the ejection rate of the entire device.
  • the mold half with the at least one cavity can also, and this is preferred, be formed in several parts.
  • a first and a second molded part, optionally also further molded parts with in particular a plurality of cavities or rows of cavities arranged next to one another, can be used.
  • the cavity assigned to a brush is then divided into several Sections divided, for example into a section in the first and a section in the second molding. These cavities merge and form the overall cavity of the mold half.
  • the first molded part can be separated from the second molded part and serves as a means of transport for the base part or parts seated in it.
  • the first molded part can be equipped with the bristled base parts first, independent of the second molded part, and only then coupled to the second molded part, namely immediately before the injection molding.
  • the first molded part is very easy to produce due to the missing hole pattern, many first molded parts can be produced and used relatively cheaply, which significantly improves the cycle time and flexibility of the entire device.
  • a separating station between the bristle machine and the injection molding tool can be provided in order to quickly clear the bristle machine again for the base parts to be bristled.
  • the invention also provides a variant of the device for producing brushes, using a method according to the invention, this device being characterized by an injection molding tool with a mold half with at least one cavity for receiving a bristled base part, the cavity having a single opening for receiving all the tufts of bristles , and has a support edge surrounding the opening for supporting and supporting the base part, characterized by a coating tool which is positioned between the bristling machine and the injection molding tool and which applies a support layer to the bristled base part on the back.
  • the coating tool which can also be designed as a single station in the injection molding tool, which then comprises several stations, is positioned between the bristling machine and the injection molding tool, that is to say possibly the station in which the aforementioned spraying of the coated, bristled base part takes place
  • the so-called brush body is injected in the injection mold, which can be of one or more components.
  • This brush body is usually the brush handle, the brush neck and part of the brush head.
  • the other part of the brush head is formed by the base part.
  • FIG. 1 A so-called perforated plate 10 of a device for manufacturing brushes consisting of several tools and stations is shown.
  • the perforated plate 10 is made of metal and preferably has a number of very precisely produced cavities 12, into which prefabricated base parts 14 of brushes, here toothbrushes, are inserted.
  • the base parts 14 are used for anchorless attachment of tufts of bristles.
  • the base parts 14 have a circumferential, raised edge and a hole pattern for filling through the bristle tufts.
  • the cavity 12 also has a corresponding hole pattern. The production of such a cavity with a hole pattern is very complex and is usually carried out by wire erosion or coordinate grinding.
  • the base parts are then filled with the bristle tufts, as is the case, for example, in EP 0 972 465 B1 is shown.
  • the perforated plate 10 serves as a transport body and also for storing and guiding the tufts of bristles which protrude into the corresponding holes in the perforated plate.
  • the section of the bristle tufts protruding into the holes is the part of the bristles which later protrudes from the brush.
  • Figure 3 shows the base parts 14 inserted into the corresponding cavities 12, it being easy to see that the base parts 14 are accommodated in the cavities 12 precisely and with a precise fit.
  • Numerous perforated plates are provided in the bristle machine, which are preferably equipped with the base parts in or outside the bristle machine and are then bristled. After the bristling machine, the perforated plates 10 are finally transferred to another machine or to another station together with the bristled base parts contained therein in order to be able to carry out a further processing step.
  • Figure 4 shows the bristled base parts 14 in the perforated plate 10, the bristle tufts 16 projecting upward with their rear end relative to the base part 14.
  • the bristles are attached to one another at their projecting ends 16 and are also connected to the base part 4. This is done, for example, by means of thermal gluing of the protruding ends of the tufts 16 by hot air, radiant heat and / or by contact heat.
  • an electrically heated tool is provided with a plurality of heated dies 18 which are connected to a power source 20.
  • the cross section of the stamp 18 is adapted to the cross section circumscribed by the edge of the corresponding base part 14.
  • Either the bristle ends 16 are previously heated and brought to the melting temperature so that they stick together, or the punches 18 are moved down against the bristle ends 16 and then glue them together by fusing.
  • the bristle ends 14 can also first be brought to temperature and fused without the stamps contacting them. Only then are the punches 18 moved down to the liquid one To press the plastic mass of the melted ends flat, so that a closed plastic layer 22 results from the melted material of the tuft ends. It is advantageous that a flat, closed layer 22 results on the back of the base part 14, but this is not absolutely necessary. There could just as easily be individual thickenings of bristle tufts 16 which result from the fusing of the individual bristles of a bristle tuft.
  • Figure 6 shows another tool, which can also be designed as a station of a larger device. This is a so-called coating tool.
  • the bristled base parts 14 located in the perforated plate 10 are preferably still in the perforated plate 10 to the in Figure 6 Coating tool shown transported and inserted there in a lower part 24 of an injection molding tool.
  • An upper part 26 with adapted cavities 28 on its underside can be moved downwards against the lower part 24 in order to close the cavity 28 downwards by the corresponding base part 14, so that a cavity results.
  • a plastic compound is then injected into the corresponding cavities, which preferably covers the back of the bristled base part 14 completely, if necessary except for the circumferential edge.
  • This applied layer is a support layer 30, which gives the unit consisting of the base part 14 and bristle tufts 16 a higher rigidity.
  • the support layer 30 is in Figure 7 to recognize.
  • the intermediate products generated are removed from the perforated plates 10 in a separation station. These intermediate products can be sorted in a store or stored temporarily without being sorted, or they can be transported from the perforated plate 10 to another machine, namely the injection molding tool explained below, immediately after their removal.
  • the injection mold is in Figure 14 to recognize. It essentially comprises a lower mold half 40 and an upper mold half 42, each of which has cavities which merge into one another when the tool is closed and form a cavity to be sprayed out.
  • the lower mold half 40 comprises at least two parts, namely a first molded part 44, which the aforementioned and in Figure 8 to see intermediate products, and a second molded part 46.
  • the first molded part 44 is in Figure 9 good to see from above. It has a plurality of cavities 46, from each of which an opening 48 emerges, which serves to receive the bristle tufts 16 of a base part 14.
  • the edge 50 which is recessed and is part of the cavity 46, surrounds the respective opening 48. This edge 50 serves as a support and support surface for the bristled base part 14.
  • the cavity 46 also has a neck section 52 as a transition between the brush head and the brush handle shown later.
  • This neck section 52 goes like Figure 14 shows, in the portion 56 of the cavity defining the handle of the brush in the second molded part 46.
  • the first molded part 44 is equipped with the prefabricated intermediate products by using an insertion tool 58, which can consist of a plurality of plates which can be moved towards one another.
  • This insertion tool 58 can also be provided in the form of a funnel.
  • the insertion tool 58 serves to press the bristle tufts 16 inwards towards one another in order to prevent the bristles on the edge from bumping against the edge 50.
  • the insertion tool 58 is removed.
  • the first molded part 44 can preferably be fitted outside the injection molding tool or in a station located before the injection molding process in the injection molding tool, as is the case, for example, with the so-called helicopter tools according to, for example DE 195 15 294 A or cube tools according to e.g. WO 2007/085063 the case is.
  • helicopter tools according to, for example DE 195 15 294 A
  • cube tools according to e.g. WO 2007/085063 the case is.
  • the assembly can take place with the tool closed during the spraying process.
  • the assembly can also take place in an open mold between two injection cycles. In this case, however, you lose some cycle time, since the tool must remain open a little longer after a spraying cycle until the assembly is complete.
  • the first molded parts 44 form transport parts for the bristled base parts 14 and transport them correspondingly to the assigned second molded parts 46. These molded parts 46 have a recess 60 into which the molded part 44 is inserted with a precise fit. The injection molding tool is then closed and the injection molding process can take place.
  • the first molded part 44 with the molded-on so-called brush body 62 is removed from the injection molding tool, and the finished brushes are separated from the first molded part 44.
  • the first molded part 44 can serve as a means of transport between the stations.
  • all injection pressure in the region of the base part 14 is recorded exclusively at the edge of the base part 14, with which the latter contacts the edge 50, during the injection molding process.
  • support projections 70 extending from a bottom of the opening 48 or starting from the second molded part 46 in the region of the recess 60 and projecting upward into the opening in the direction of the base part 14.
  • the support extensions 70 are linear or, as shown, punctiform support points and preferably taper towards the base part 14 in order to be able to slide between bristles.
  • the base part is not made before welding the bristle ends, but afterwards.
  • bristle tufts 16 are introduced into holes in a perforated plate 10 with a corresponding cavity 80 for the base part to be produced later in a bristle tool ( Figure 16 ).
  • the bristle ends of the bristle tufts 16 projecting upward are first fused together.
  • This perforated plate 10 is then transported into an injection molding tool in order to encapsulate the tufts 16. If the bristle ends are melted into a flat plastic plate and not into a ball-like thickening, the base part 14 is essentially only sprayed on, but this should also fall under "overmolding".
  • the bristled base parts 14 are separated from the perforated plates 10 ( Figure 19 ) and either fed to a previously described storage / buffer storage and later or immediately according to the Figures 9 to 15 processed further.
  • the bristled base parts 14 must therefore be inserted into the first molded parts 44 (for example fully automatically) in order to then be transported to the injection molding tool.
  • the injection molding process is carried out as described in the first exemplary embodiment.
  • the base part is supported on the edge of an opening 48 in a cavity 46 of the mold half.
  • the tufts 16 protrude into the opening 48, which is very easy to manufacture due to its size.
  • the device for producing brushes can only consist of the injection molding tool or, alternatively, can also consist of additional tools such as the bristle tool and / or the tool shown in FIGS Figures 6 and 7 coating tool shown. Separation stations and assembly stations between individual tools or stations can also be provided, in which intermediate products are removed from tool parts or carrier parts or inserted into them.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Brushes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Coating Apparatus (AREA)
EP11730582.1A 2010-07-02 2011-07-04 Verfahren und vorrichtung zum herstellen von bürsten Active EP2587959B2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010025852A DE102010025852A1 (de) 2010-07-02 2010-07-02 Verfahren und Vorrichtung zum Herstellen von Bürsten
PCT/EP2011/003310 WO2012000689A1 (de) 2010-07-02 2011-07-04 Verfahren und vorrichtung zum herstellen von bürsten

Publications (3)

Publication Number Publication Date
EP2587959A1 EP2587959A1 (de) 2013-05-08
EP2587959B1 EP2587959B1 (de) 2017-10-25
EP2587959B2 true EP2587959B2 (de) 2020-05-27

Family

ID=44628263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11730582.1A Active EP2587959B2 (de) 2010-07-02 2011-07-04 Verfahren und vorrichtung zum herstellen von bürsten

Country Status (5)

Country Link
EP (1) EP2587959B2 (zh)
CN (1) CN103037734B (zh)
DE (1) DE102010025852A1 (zh)
ES (1) ES2657248T3 (zh)
WO (1) WO2012000689A1 (zh)

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BR112014030983B1 (pt) * 2012-06-12 2021-08-24 Braun Gmbh Método para produzir uma cabeça de escova para uma escova de dente
EP2674061B1 (en) * 2012-06-12 2017-07-19 Braun GmbH Method and tool for producing a brush head
IES20160032A2 (en) * 2016-01-25 2017-07-26 Glaxosmithkline Consumer Healthcare (Uk) Ip Ltd A method of moulding a turfed body with a curved outer surface
BR112018069790A2 (pt) 2016-04-20 2019-01-29 Trisa Holding Ag produto de escova e processo para produção do mesmo
JP7219762B2 (ja) * 2017-10-24 2023-02-08 コーニンクレッカ フィリップス エヌ ヴェ 成形された房キャリアとベースプレートとを使用してブラシヘッドを製造する方法
JP7219764B2 (ja) * 2017-11-07 2023-02-08 コーニンクレッカ フィリップス エヌ ヴェ ブラシヘッド製造方法及びブラシヘッド
CN109330178A (zh) * 2018-11-23 2019-02-15 幸福草(上海)口腔护理用品有限公司 一种牙刷制造用模具及牙刷制造方法
WO2024007571A1 (zh) * 2023-01-17 2024-01-11 赫比（厦门）精密塑胶制品有限公司 用于牙刷头生产的刷头治具及牙刷头的制造方法

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DE4311186A1 (de) † 1993-04-06 1994-10-13 Schiffer Fa M & C Verfahren und Vorrichtung zur Herstellung von Bürstenwaren
DE19515294A1 (de) † 1995-04-26 1996-10-31 Zahoransky Formenbau Gmbh Bürstenherstellungsmaschine
DE19542393A1 (de) † 1995-11-14 1997-05-15 Zahoransky Anton Gmbh & Co Verfahren zum Herstellen von Bürsten sowie Bürstenherstellungsmaschine
EP0972465A1 (en) † 1998-07-14 2000-01-19 Firma G.B. BOUCHERIE, naamloze vennootschap Method for manufacturing brushes and brush manufacturing machine applying this method
EP1110478A1 (de) † 1999-12-22 2001-06-27 M + C Schiffer GmbH Verfahren zur Herstellung eines Bürstenkopfes im Wege des Spritzgiessens
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WO2007085063A1 (en) † 2006-01-27 2007-08-02 Firma G.B. Boucherie, Naamloze Vennootschap Device for manufacturing injection moulding pieces
EP1864588A2 (de) † 2006-06-08 2007-12-12 M + C Schiffer GmbH Zahnbürste und Verfahren zu deren Herstellung
DE102006026712A1 (de) † 2006-06-08 2007-12-13 M + C Schiffer Gmbh Zahnbürste und Verfahren zu deren Herstellung
EP2078472A1 (en) † 2008-01-10 2009-07-15 G.B. Boucherie, N.V. Stamp for pressing bundles of fibres
DE102008057546A1 (de) † 2008-11-08 2010-05-12 Zahoransky Ag Bürstenherstellungsmaschine

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DE102010025852A1 (de) 2012-03-29
CN103037734A (zh) 2013-04-10
WO2012000689A1 (de) 2012-01-05
EP2587959A1 (de) 2013-05-08
EP2587959B1 (de) 2017-10-25
CN103037734B (zh) 2015-11-25

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