WO2006002804A1 - Processus de moulage par injection et moule de fabrication de brosse a dents - Google Patents

Processus de moulage par injection et moule de fabrication de brosse a dents Download PDF

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Publication number
WO2006002804A1
WO2006002804A1 PCT/EP2005/006696 EP2005006696W WO2006002804A1 WO 2006002804 A1 WO2006002804 A1 WO 2006002804A1 EP 2005006696 W EP2005006696 W EP 2005006696W WO 2006002804 A1 WO2006002804 A1 WO 2006002804A1
Authority
WO
WIPO (PCT)
Prior art keywords
mould
toothbrush
plastic material
conduit
cavity
Prior art date
Application number
PCT/EP2005/006696
Other languages
English (en)
Inventor
Wolf-Dieter Mueller
Original Assignee
Glaxosmithkline Consumer Healthcare Gmbh & Co Kg.
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 Glaxosmithkline Consumer Healthcare Gmbh & Co Kg. filed Critical Glaxosmithkline Consumer Healthcare Gmbh & Co Kg.
Publication of WO2006002804A1 publication Critical patent/WO2006002804A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1676—Making multilayered or multicoloured articles using a soft material and a rigid material, e.g. making articles with a sealing part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C2045/1681—Making multilayered or multicoloured articles one layer penetrating at one or more areas through another layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/42—Brushes
    • B29L2031/425—Toothbrush

Definitions

  • This invention relates to a process for making toothbrushes, in particular an injection moulding process.
  • Toothbrushes are well-known articles and normally comprise a head and a grip handle, generally with a narrowed neck region in between, all arranged along a longitudinal head-handle direction.
  • Normally toothbrushes are made primarily of a rigid plastic material, e.g. a polypropylene or styrol acryl nitrol ("SAN").
  • SAN polypropylene or styrol acryl nitrol
  • Many are so called two-component toothbrushes comprising a part made of plastic, e.g. the head and the main structure or “skeleton" of the handle, and a part made of a softer resilient elastomer, such as a thermoplastic elastomer e.g. SantopreneTM e.g. comprising part of the grip handle, to enhance grip, aesthetic appearance or to influence flexibility.
  • Toothbrush heads generally incorporate oral hygiene parts such as bristles, which project from the head in a bristle direction. Toothbrushes are normally made by a process in which the plastic material part of their structure is first made, generally by injection moulding. Then this plastic part is enclosed in a mould cavity which defines the shape of the elastomer material part, and the elastomer material of the second component in a fluid state is injected into this mould cavity to form the elastomer material part. Normally the plastic material is formed with one or more cavity to receive this second material. US-A-
  • 3,633,237 discloses such a toothbrush head having cavities in the plastic material part with which the elastomer part can engage.
  • Such injection moulds are mould assemblies comprising one or more, generally two, mould blocks each with a part mould cavity therein, which when brought together in the assembled mould mate so that their part mould cavities combine to form a complete mould cavity between them.
  • WO- A-02/13656 for example describes such a process and suitable moulding machinery for its performance being a so called stack mould.
  • US-A-6,353,958 discloses a toothbrush incorporating a plastic spring part made of a higher elastic modulus than that of the toothbrush handle, and discloses that such a toothbrush may be made by inserting the spring part in the mould and then injecting the plastic material of the handle into the mould.
  • US-A-2004/0113312 discloses an injection moulding process in which a first component is made by injection moulding, and is then enclosed in a second injection mould for injection of further plastic material.
  • this invention provides a process for making a toothbrush, wherein; in a first stage a toothbrush part is made of a first plastic material, having a conduit therein which is open at one or more opening on the outer surface of the part, in a second stage a second plastic material in a fluid state is injected into the conduit via an opening, and this second plastic material is allowed to harden.
  • the toothbrush part may be a toothbrush handle
  • the first and second plastic materials may be any of the plastic materials known for toothbrush handle manufacture.
  • the first plastic material is a transparent, optionally coloured, material so that the second plastic material is visible through the first plastic material, providing an aesthetic function, hi such a case preferably the second plastic material may be an opaque, coloured or translucent material.
  • the first and second plastic materials may be the same plastic material but of different colours, or one transparent and the other coloured or filled with an opaque filler.
  • the process is an injection moulding process wherein: in the first stage a first mould is provided having a first mould cavity, bounded by a cavity wall, which defines at least some of the shape of the toothbrush part, the mould incorporating a core which can be moved between extended and withdrawn positions in which respectively the core extends a further and a lesser distance into the mould cavity and which in the extended position defines at least part of the shape of the conduit, providing said core in the extended position, injecting a first plastic material into the mould cavity in a fluid condition and allowing the first plastic material to harden, moving the core into the withdrawn position, then in the second stage injecting the second plastic material in a fluid state into the conduit and this second plastic material is allowed to harden
  • Such a core or plural cores may be provided by known technology in the injection moulding field injection moulding of providing parts which can be slideably moved into extended and withdrawn positions, with a suitable fluid plastic material- tight seal between the core(s) and the mould, e.g. a sliding seal.
  • a suitable fluid plastic material- tight seal between the core(s) and the mould e.g. a sliding seal.
  • the toothbrush part formed in the first stage is enclosed in a second mould having a second mould cavity, bounded by a cavity wall, which defines at least some of the shape of the toothbrush part.
  • the second plastic material may be injected into such a second mould via an injection port which is in communication with the conduit when the toothbrush part is enclosed therein.
  • a first mould may be constructed in which it is feasible to inject the second plastic material via an injection port which is in communication with the conduit when the toothbrush part is enclosed in the first mould.
  • the second mould cavity may have one or more recess in its cavity wall, which when the toothbrush part is enclosed in this second mould is/are in communication with the opening(s) at the outer surface of the toothbrush part.
  • Flow of the second plastic material from the conduit through such openings into such a recess can result in formation of a convex bulge of the hardened second plastic material beyond the outer surface of the toothbrush part.
  • Such a convex bulge may have a technical function e.g. in enhancing a user's grip of the toothbrush handle, or may have an aesthetic function.
  • the first and second moulds each comprise at least two part-moulds which can be separated across a split line to enable removal of the formed toothbrush part therefrom.
  • the conduit is a void in the hard plastic material, suitably in the handle and/or in the neck defining a path along which fluid material may flow.
  • the conduit is continuous.
  • the conduit maybe elongate and undulating in the longitudinal direction of the toothbrush.
  • the conduit is open at plural openings on the outer surface of the part of the toothbrush.
  • such plural openings are disposed on opposite sides of the part. Preferably such opposite sides are distanced in the bristle direction.
  • the toothbrush part may incorporate a cavity, and in a third stage an elastomeric material in a fluid state may be injected into the cavity and allowed to harden.
  • a third stage the toothbrush part formed in the first or second stage is enclosed in a third mould having a third mould cavity, bounded by a cavity wall, which defines at least some of the shape of the toothbrush part.
  • the elastomeric material may be injected into such a third mould via an injection port.
  • the third mould cavity may have one or more recess in its cavity wall, which when the toothbrush part is enclosed in this third mould is/are in communication with the injection port.
  • the elastomeric material may have a technical function e.g. in enhancing a user's grip of the toothbrush handle or its flexibility, or may have an aesthetic function.
  • the invention also provides a first mould for a process as described herein, having a first mould cavity, bounded by a cavity wall, which defines at least some of the shape of a toothbrush part to be formed therein, the mould incorporating a core which can be moved between extended and withdrawn positions in which respectively the core extends a further and a lesser distance into the mould cavity and which in the extended position defines at least part of the shape of a conduit to be formed in the toothbrush part, providing said core in the extended position, the mould having an injection port for injection of a first plastic material into the mould cavity in a fluid condition.
  • the invention also provides a toothbrush when made by process of this invention.
  • the invention will now be described by way of example only with reference to the accompanying figures which show.
  • Fig. 1 a section through a first mould with cores extended.
  • Fig. 2 a section through the first mould with cores extended, and with first plastic material in the mould cavity.
  • Fig. 3 a section through the first mould with cores withdrawn, and with a formed toothbrush part in the mould cavity.
  • Fig. 4 a section through the toothbrush part as formed.
  • Fig. 5 a section through a second mould with the formed toothbrush part in the mould cavity.
  • Fig. 6 a section through the second mould with first plastic material injected into the conduit.
  • Fig. 7 a section through the toothbrush part as formed.
  • Fig. 8 a section through a third mould with the formed toothbrush part in the mould cavity.
  • Fig. 10 a section through the toothbrush part as formed.
  • Fig. 11 a section through an alternative construction of second mould.
  • a first plastic material 16 is injected via injection port 17 into the mould cavity 12 in a fluid condition and is allowed to harden.
  • Fig 3 A is a cross sectional view through line A-A of Fig. 3 showing how the core 141 does not extend across the entire cross section of the mould cavity 12, but leaves gaps 19 around each side of the core through which the plastics material 16 may flow.
  • the mould 10 may then be opened at the split line 11 and the formed part 20 removed in a conventional manner.
  • the cores 141-144 may have other orientations, for example they need not contact each other, but may contact only the cavity wall 13 opposite their respective guide 151, 152, 153, 154, for example the cores 141-144 may extend parallel to each other across the mould cavity 12.
  • a second plastic material 34 is injected into the second mould 30 via an injection port 35 which is in communication with the conduit 18 when the toothbrush part 20 is enclosed therein and is allowed to harden.
  • the second mould cavity 32 has plural recesses in its cavity wall 33, which when the toothbrush part 20 is enclosed in this second mould 30 are in communication with the openings 110 of the conduit 18. Flow of the second plastic material 34 from the conduit 18 through such openings 110 into these recesses 36 result in formation of convex bulges 41 of the hardened second plastic material 34 beyond the outer surface of the toothbrush part 40.
  • the toothbrush part 40 from the above second stage incorporates a cavity 42.
  • a third mould 50 comprising two part moulds 50A, 50B which separate at split line 51.
  • the mould 50 is made of conventional steel.
  • the mould 50 defines a third mould cavity 52, each part mould 50A, 5OB defining part of the cavity 52, the cavity 52 being bounded by a cavity wall 53.
  • the cavity 52 defines at least some of the shape of a toothbrush part 60 to be formed therein.
  • an elastomeric material 54 is injected into the third mould via an injection port 55.
  • FIG. 11 an alternative construction of second mould 70 is shown in which the product 20 may be enclosed, and provided with injection ports 35, 55 for respective inj ection of second plastic material into conduit 18 and of elastomeric material into recess 56.

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

Abstract

La présente invention concerne un processus de fabrication de brosse à dents, dans lequel un premier moule (10) définit au moins une partie de la forme de la pièce de brosse à dents, ce moule incorporant un poinçon (141, 142, 143, 144) qui peut être déplacé entre une position déployé et retiré, la position déployé définissant au moins une partie de la forme d'un conduit (18) et plaçant le poinçon en position déployé. On injecte une première matière plastique (16) dans la cavité du moule (12) à l'état liquide et on permet à cette matière plastique de durcir. Plaçant le poinçon en position retiré, on injecte dans une seconde étape la seconde matière plastique (34) à l'état liquide dans le conduit et on permet à cette seconde matière plastique de durcir.
PCT/EP2005/006696 2004-06-25 2005-06-20 Processus de moulage par injection et moule de fabrication de brosse a dents WO2006002804A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0414335A GB0414335D0 (en) 2004-06-25 2004-06-25 Process
GB0414335.0 2004-06-25

Publications (1)

Publication Number Publication Date
WO2006002804A1 true WO2006002804A1 (fr) 2006-01-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2005/006696 WO2006002804A1 (fr) 2004-06-25 2005-06-20 Processus de moulage par injection et moule de fabrication de brosse a dents

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GB (1) GB0414335D0 (fr)
WO (1) WO2006002804A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101249711B (zh) * 2008-03-28 2010-10-13 胡志刚 一种自动双色牙刷成型模具
CN102107488A (zh) * 2010-11-23 2011-06-29 武汉市今晨实业有限公司 两次注塑成型生产牙刷刷柄的方法
US20150089758A1 (en) * 2013-09-27 2015-04-02 M+C Schiffer Gmbh Method for Making a Toothbrush
US20160221234A1 (en) * 2015-02-02 2016-08-04 Colgate-Palmolive Company System and method for forming an oral care implement
US9635928B2 (en) 2012-11-05 2017-05-02 The Procter & Gamble Company Toothbrush comprising elastomeric cleaning elements over-molded with a harder plastic and method for producing the same
EP2512288B1 (fr) 2009-12-18 2017-10-04 Colgate-Palmolive Company Instrument de soin buccal muni d'un manche multicomposant
US10786071B2 (en) 2009-12-18 2020-09-29 Colgate-Palmolive Company Oral care implement having multi-component handle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0550463A (ja) * 1991-08-26 1993-03-02 Sunstar Inc 複合成形体の射出成形法並びにそれで用いる射出成形用金型
WO1996038068A1 (fr) * 1995-05-31 1996-12-05 M + C Schiffer Gmbh Brosse a dents
WO1998035809A1 (fr) * 1997-02-14 1998-08-20 Smithkline Beecham Consumer Healthcare Gmbh Procede de moulage par injection et appareil permettant de fabriquer des pieces a partir de deux composants
WO1999016604A1 (fr) * 1997-10-01 1999-04-08 M + C Schiffer Gmbh Procede et dispositif pour produire un brosse a dents
JP2001178538A (ja) * 1999-12-24 2001-07-03 Lion Corp 柄付きブラシ
WO2001096088A1 (fr) * 2000-06-15 2001-12-20 Glaxosmithkline Consumer Healthcare Gmbh & Co Kg Moulage par injection d'articles composites et brosses a dents realisees selon ce procede

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0550463A (ja) * 1991-08-26 1993-03-02 Sunstar Inc 複合成形体の射出成形法並びにそれで用いる射出成形用金型
WO1996038068A1 (fr) * 1995-05-31 1996-12-05 M + C Schiffer Gmbh Brosse a dents
WO1998035809A1 (fr) * 1997-02-14 1998-08-20 Smithkline Beecham Consumer Healthcare Gmbh Procede de moulage par injection et appareil permettant de fabriquer des pieces a partir de deux composants
WO1999016604A1 (fr) * 1997-10-01 1999-04-08 M + C Schiffer Gmbh Procede et dispositif pour produire un brosse a dents
JP2001178538A (ja) * 1999-12-24 2001-07-03 Lion Corp 柄付きブラシ
WO2001096088A1 (fr) * 2000-06-15 2001-12-20 Glaxosmithkline Consumer Healthcare Gmbh & Co Kg Moulage par injection d'articles composites et brosses a dents realisees selon ce procede

Non-Patent Citations (4)

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JOHANNABER F ET AL: "Handbuch Spritzgiessen, 2K-VERBUNDSPRITZGIESSEN/ZWEIFARBENSPRITZGIES SEN (2F-SG), OVERMOULDING", HANDBUCH SPRITZGIESSEN, 2001, pages 506 - 509,1024, XP002253157 *
PATENT ABSTRACTS OF JAPAN vol. 017, no. 352 (M - 1439) 5 July 1993 (1993-07-05) *
PATENT ABSTRACTS OF JAPAN vol. 2000, no. 24 11 May 2001 (2001-05-11) *
REKER H ET AL: "KONSTRUKTION UND FERTIGUNG EINES RASIERERGEHAUSES IN HART-WEICH-TECHNIK", KUNSTSTOFFE, CARL HANSER VERLAG, MUNCHEN, DE, vol. 79, no. 2, 1 February 1989 (1989-02-01), pages 164 - 166, XP000028763, ISSN: 0023-5563 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101249711B (zh) * 2008-03-28 2010-10-13 胡志刚 一种自动双色牙刷成型模具
EP2512288B1 (fr) 2009-12-18 2017-10-04 Colgate-Palmolive Company Instrument de soin buccal muni d'un manche multicomposant
EP3269272B1 (fr) * 2009-12-18 2020-09-16 Colgate-Palmolive Company Instrument de soin buccal muni d'un manche multicomposant
US10786071B2 (en) 2009-12-18 2020-09-29 Colgate-Palmolive Company Oral care implement having multi-component handle
EP2512288B2 (fr) † 2009-12-18 2020-11-25 Colgate-Palmolive Company Instrument de soin buccal muni d'un manche multicomposant
US11338485B2 (en) 2009-12-18 2022-05-24 Colgate-Palmolive Company Oral care implement having multi-component handle
CN102107488A (zh) * 2010-11-23 2011-06-29 武汉市今晨实业有限公司 两次注塑成型生产牙刷刷柄的方法
US9635928B2 (en) 2012-11-05 2017-05-02 The Procter & Gamble Company Toothbrush comprising elastomeric cleaning elements over-molded with a harder plastic and method for producing the same
US20150089758A1 (en) * 2013-09-27 2015-04-02 M+C Schiffer Gmbh Method for Making a Toothbrush
US9609942B2 (en) * 2013-09-27 2017-04-04 M+C Schiffer Gmbh Method for making a toothbrush
US20160221234A1 (en) * 2015-02-02 2016-08-04 Colgate-Palmolive Company System and method for forming an oral care implement
US9802347B2 (en) * 2015-02-02 2017-10-31 Colgate-Palmolive Company Method of forming an oral care implement

Also Published As

Publication number Publication date
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