WO1997038840A1 - Moulage de deux materiaux - Google Patents

Moulage de deux materiaux Download PDF

Info

Publication number
WO1997038840A1
WO1997038840A1 PCT/GB1997/001090 GB9701090W WO9738840A1 WO 1997038840 A1 WO1997038840 A1 WO 1997038840A1 GB 9701090 W GB9701090 W GB 9701090W WO 9738840 A1 WO9738840 A1 WO 9738840A1
Authority
WO
WIPO (PCT)
Prior art keywords
moulding
mould
movable portion
inlet
toothbrushes
Prior art date
Application number
PCT/GB1997/001090
Other languages
English (en)
Inventor
Louis William Sanderson
Original Assignee
J & W Sanderson Limited
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 J & W Sanderson Limited filed Critical J & W Sanderson Limited
Publication of WO1997038840A1 publication Critical patent/WO1997038840A1/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
    • B29C45/1635—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
    • 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 the moulding of articles from two materials and is more particularly concerned with the moulding of toothbrushes from two materials.
  • toothbrushes have been manufactured with handles which include a grip portion of a different material from the remainder of the handle.
  • the grip portion is formed from an additional layer of rubber or elastomeric material which enhances a user's grip on the brush when wet.
  • Manufacture of such brushes tends to be expensive since complex robotics are needed to move the toothbrush during the manufacturing process to allow for the addition of the second material to form the grip portion. Problems may also arise with the repositioning of th « toothbrush following its movement.
  • the invention provides a method of moulding articles, particularly but not exclusively toothbrushes, from two materials, the method comprising the steps of introducing a first moulding material into a mould, retracting a portion of the mould to form a cavity between the retracted portion and the first material, and introducing a second moulding material into the cavity.
  • the invention provides moulding apparatus, particularly but not exclusively for manufacturing toothbrushes, the apparatus comprising a mould with inlets for first and second moulding materials, a movable portion which is retractable relative to the remainder of the mould to form a cavity between the retracted portion and a body moulded from the first material prior to retraction, and means for the opening the inlet for the second material when the movable portion is retracted.
  • the first inlet is in the form of a gate and, for the moulding of toothbrushes, may be situated in a position which corresponds to the end of the toothbrush opposite the head.
  • the second inlet may be a duct or passage formed in the movable portion and opening onto the moulding surface thereof.
  • the means for opening the second inlet may comprise a pin slidable in the duct or passage and retractable therealong to open communication between a source of the second material and the cavity formed by the retraction of the movable portion.
  • the second inlet may be formed in the remaining, fixed part of the mould, adjacent the movable portion, so that it is opened by the retraction of the movable portion itself.
  • the second inlet may be in the wall of the mould opposite the movable portion and may be closed by a pin slidable in the movable portion between an advanced position in which it extends across the mould to close the inlet and a retracted position in the movable portion; in this embodiment, after moulding, the second material extends through the first material as a plug occupying the space left by the pin upon retraction and this plug conveniently serves to anchor the second material to the first material.
  • the movable portion of the mould preferably corresponds to the grip portion of the handle of the toothbrush and the moulding surface of the movable portion may be profiled to form ribs, grooves or the like on the surface of the grip portion.
  • the natural shrinkage of the first material on cooling is taken into account in determining the distance to be moved by the movable portion: provided that the distance moved by the movable portion is greater than the natural shrinkage of the first material, the second material will contact and attach or adhere to the first material.
  • the attachment or adhesion may be enhanced if the moulding surface of the movable portion is profiled because the ribs or grooves formed in the moulded body of the first material by the surface before retraction will enable positive keying of the second material to the first.
  • two movable portions may be provided on opposite sides of the mould to produce grip portions on both sides of the handles of the brushes.
  • the first material is a rigid plastics material, for example polypropylene
  • the second material is rubber or an elastomeric material.
  • Figure 1 is a partial side view in section of a mould according to the invention in the first position
  • Figure 2 is a partia.l sectional side view of the mould of Figure 1 in a second position
  • Figure 3 is a top view of a finished handle portion of a toothbrush made in the mould of Figures 1 and 2.
  • a mould 10 for forming toothbrushes is provided with an inlet 11 for a first moulding material, a movable portion 12 which forms part of one of the sides of the mould 10, and an inlet 13 for a second moulding material, the outlet 13 being formed in the movable portion 12.
  • the portion 12 has a surface 12A profiled with a series of transverse grooves and ribs for forming grip portions on the handles of the toothbrushes made in the mould 10 and the portion 12 is displaceable relative to the remainder of the mould between an advanced position, shown in Figure 1 , in which the surface 12A .is substantially coplanar with the corresponding side of the mould, and a retracted position.
  • the first material for example molten polypropylene
  • the first material for example molten polypropylene
  • the inlet 11 is closed after the introduction of the first material.
  • the movable portion 12 is then retracted ( Figure 2) to create between the body 20 and the surface 12A a cavity 14 of a width corresponding to che desired thickness of the grip portion to be forrred, and the pin 16 is retracted or removed from the inlet 13 to connect the inlet 13 to a source (not shown) of the second material.
  • the second material preferably an elastomeric material
  • the second material is introduced into the cavity 14 through the inlet 13 and the inlet 13 is then closed again by the readvance of the pin 16.
  • Sharp transverse ridges 15 at opposite ends of the surface 12A of the portion 12 form notches in the first material of the body 20 to ensure efficient adhesion of the second material to the first.
  • the second material is allowed to cure or harden to form a grip portion 21 and the finished toothbrush handle ( Figure 3) is removed from the mould.
  • the finished handle 20 thus comprises a grip portion 21 of a different material from the body of the brush.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Brushes (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention porte sur un procédé de moulage d'articles, tels que des brosses à dents faites de deux matériaux consistant à introduire le premier matériau à mouler dans un moule, puis à reculer une partie du moule pour former une cavité entre la partie reculée et le premier matériau, puis à introduire le deuxième matériau à mouler dans la cavité. L'invention porte également sur un appareil de mise en oeuvre dudit procédé.
PCT/GB1997/001090 1996-04-18 1997-04-18 Moulage de deux materiaux WO1997038840A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9608079.1 1996-04-18
GBGB9608079.1A GB9608079D0 (en) 1996-04-18 1996-04-18 Two-material moulding

Publications (1)

Publication Number Publication Date
WO1997038840A1 true WO1997038840A1 (fr) 1997-10-23

Family

ID=10792302

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/001090 WO1997038840A1 (fr) 1996-04-18 1997-04-18 Moulage de deux materiaux

Country Status (2)

Country Link
GB (1) GB9608079D0 (fr)
WO (1) WO1997038840A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0990593A1 (fr) * 1998-09-29 2000-04-05 AptarGroup, Inc. Dispositif de distribution par basculement, l'élément poussoir étant fabriqué par injection multiple
WO2009049435A1 (fr) * 2007-10-19 2009-04-23 Weidmann Plastics Technology Ag Procédé pour produire des pièces en plastique à plusieurs éléments, outil de moulage par injection et pièce moulée produite selon ce procédé
US20150089758A1 (en) * 2013-09-27 2015-04-02 M+C Schiffer Gmbh Method for Making a Toothbrush
EP2886266A1 (fr) * 2013-12-23 2015-06-24 Arcos Hermanos, S.A. Structure améliorée de manches de couteaux avec support d'identification visuelle
BE1021713B1 (fr) * 2012-10-31 2016-01-12 Zahoransky Formenbau Gmbh Dispositif et procede de fabrication de corps de brosse ou de corps de brosse partiels
DE102008059222B4 (de) 2008-06-20 2018-07-26 Hyundai Motor Co. Gerät und Verfahren zur Erzeugung eines Harzproduktes
US10759332B2 (en) 2016-01-14 2020-09-01 Weidplas Gmbh Component comprising a flat decorative element and housing

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139942A (en) * 1980-04-03 1981-10-31 Nissan Motor Co Ltd Molding of resin part
DE3114827A1 (de) * 1981-04-11 1982-11-04 Volkswagenwerk Ag, 3180 Wolfsburg "verfahren zur herstellung eines bauteils in einer spritzgiessform"
FR2572676A1 (fr) * 1984-11-02 1986-05-09 Yoshida Industry Co Procede et appareil de faconnage de moulages en resine synthetique multicolores
DE3446020A1 (de) * 1984-12-17 1986-06-19 Peguform-Werke GmbH, 7805 Bötzingen Verfahren zur herstellung von spritzgussteilen aus kunststoff
JPS62108019A (ja) * 1985-11-07 1987-05-19 Yoshida Kogyo Kk <Ykk> 合成樹脂多色成形品の成形方法並びに成形装置及びその成形品
JPH0271710A (ja) * 1988-09-07 1990-03-12 Shin Etsu Polymer Co Ltd ブラシハンドルおよびその製造方法
WO1994005183A1 (fr) * 1992-09-01 1994-03-17 Jordan, A.S Brosse a dents et son procede de fabrication

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56139942A (en) * 1980-04-03 1981-10-31 Nissan Motor Co Ltd Molding of resin part
DE3114827A1 (de) * 1981-04-11 1982-11-04 Volkswagenwerk Ag, 3180 Wolfsburg "verfahren zur herstellung eines bauteils in einer spritzgiessform"
FR2572676A1 (fr) * 1984-11-02 1986-05-09 Yoshida Industry Co Procede et appareil de faconnage de moulages en resine synthetique multicolores
DE3446020A1 (de) * 1984-12-17 1986-06-19 Peguform-Werke GmbH, 7805 Bötzingen Verfahren zur herstellung von spritzgussteilen aus kunststoff
JPS62108019A (ja) * 1985-11-07 1987-05-19 Yoshida Kogyo Kk <Ykk> 合成樹脂多色成形品の成形方法並びに成形装置及びその成形品
JPH0271710A (ja) * 1988-09-07 1990-03-12 Shin Etsu Polymer Co Ltd ブラシハンドルおよびその製造方法
WO1994005183A1 (fr) * 1992-09-01 1994-03-17 Jordan, A.S Brosse a dents et son procede de fabrication

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 327 (M - 635)<2774> 24 October 1987 (1987-10-24) *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 254 (C - 0724) 31 May 1990 (1990-05-31) *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 23 (M - 111)<901> 10 February 1982 (1982-02-10) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0990593A1 (fr) * 1998-09-29 2000-04-05 AptarGroup, Inc. Dispositif de distribution par basculement, l'élément poussoir étant fabriqué par injection multiple
WO2009049435A1 (fr) * 2007-10-19 2009-04-23 Weidmann Plastics Technology Ag Procédé pour produire des pièces en plastique à plusieurs éléments, outil de moulage par injection et pièce moulée produite selon ce procédé
DE102008059222B4 (de) 2008-06-20 2018-07-26 Hyundai Motor Co. Gerät und Verfahren zur Erzeugung eines Harzproduktes
BE1021713B1 (fr) * 2012-10-31 2016-01-12 Zahoransky Formenbau Gmbh Dispositif et procede de fabrication de corps de brosse ou de corps de brosse partiels
US20150089758A1 (en) * 2013-09-27 2015-04-02 M+C Schiffer Gmbh Method for Making a Toothbrush
EP2853371B1 (fr) * 2013-09-27 2016-12-21 M+C Schiffer GmbH Procédé de fabrication d'une brosse à dents et brosse à dents
US9609942B2 (en) 2013-09-27 2017-04-04 M+C Schiffer Gmbh Method for making a toothbrush
EP2886266A1 (fr) * 2013-12-23 2015-06-24 Arcos Hermanos, S.A. Structure améliorée de manches de couteaux avec support d'identification visuelle
US10759332B2 (en) 2016-01-14 2020-09-01 Weidplas Gmbh Component comprising a flat decorative element and housing

Also Published As

Publication number Publication date
GB9608079D0 (en) 1996-06-19

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