WO1991015352A1 - Moulage de mousse dans une pellicule elastomere - Google Patents

Moulage de mousse dans une pellicule elastomere Download PDF

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Publication number
WO1991015352A1
WO1991015352A1 PCT/AU1991/000134 AU9100134W WO9115352A1 WO 1991015352 A1 WO1991015352 A1 WO 1991015352A1 AU 9100134 W AU9100134 W AU 9100134W WO 9115352 A1 WO9115352 A1 WO 9115352A1
Authority
WO
WIPO (PCT)
Prior art keywords
skin
foam
die
air
skeletal frame
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.)
Ceased
Application number
PCT/AU1991/000134
Other languages
English (en)
Inventor
Karl Martin De Porteous
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1991015352A1 publication Critical patent/WO1991015352A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63H—TOYS, e.g. TOPS, DOLLS, HOOPS OR BUILDING BLOCKS
    • A63H9/00—Special methods or compositions for the manufacture of dolls, toy animals, toy figures, or parts thereof
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/46—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles using fluid pressure
    • 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
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
    • B29C33/48—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling
    • B29C33/50—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible
    • B29C33/505—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with means for collapsing or disassembling elastic or flexible cores or mandrels, e.g. inflatable
    • 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
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0003—Discharging moulded articles from the mould
    • B29C37/0017—Discharging moulded articles from the mould by stripping articles from mould cores
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/14—Dipping a core
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/42—Removing articles from moulds, cores or other substrates
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/46—Heating or cooling
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/12—Incorporating or moulding on preformed parts, e.g. inserts or reinforcements
    • 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
    • B29L2031/52—Sports equipment ; Games; Articles for amusement; Toys
    • B29L2031/5209—Toys
    • B29L2031/5218—Dolls, puppets

Definitions

  • This invention relates to a moulding method wherein a polyurethane or other foam is moulded within an elastomeric skin to form a finished article.
  • the invention has general application in many areas, but the preferred embodiment described herein relates to the production of a doll, whether it be a small doll as may be used for example by a child, or a large mannequin which can be used for the display of fashion garments or the like.
  • This invention is one of a series of inventions which also include PCT Application WO89/06564 wherein a skeleton of a doll was described and claimed.
  • the limbs should be capable of simulating human limbs and should have sufficient resistance to movement that once set in a position they will stay in that position, and the Australian Patent Application PJ 9390 (PCT ) was directed to a hinge which is suitable for dolls, mannequins and other mould products wherein relative movement of limbs is a desirable feature.
  • PCT Australian Patent Application PJ 9390
  • a method of moulding foam over a skeletal frame and within a skin comprises firstly inserting the frame into the skin, and supporting the frame and skin in a hollow of a female die the internal surface of which is complementary to a finished article shape, evacuating the air from the interior of the skin in order to collapse the skin, and injecting a foam-forming liquid into the collapsed skin so as to form a foam which will expand the skin and urge it into contact with the internal surface of the die, while at the same time maintaining a low back pressure of air.
  • the air pressure can be very low, in the order of 0.3 psi, and usually will lie in the range of 0.1 to 5 psi.
  • Thin skins are generally desirable and the above- identified PCT Application AU90/00388 emphasised the need for a thin latex skin for a doll.
  • thin skins are not always required and it is desirable that a method exists whereby thicker skins can be used, for example up to 0.8mm for a mannequin.
  • the skin should not lose its shape during the moulding process, but rather take the shape of the internal surface of the die, and in an embodiment of this invention the skin is only partially cured when it is formed over a former, and the partly cured skin is removed and the curing of the skin is completed by the reaction heat of the foam-forming liquid during the foaming of the liquid.
  • Another practical problem which is encountered in moulding between a skeletal frame and an imperforate skin is the correct location of frame and skin, and this invention achieves the satisfactory location by having the skin with an opening surrounded by a circular bead at one end and at least one protuberance at the other end, the skeletal frame being located in the die by sealably engaging the circular bead over a discoid-shaped moulding plate which is carried by the skeletal frame at one end, and deforming the protuberance or protuberances into an aperture or apertures in the other end by means of a locating spigot carried by the die. With this method of location the skin is not punctured.
  • the aforesaid moulding plate is provided with an aperture which, during injection, is aligned with the rotor of an injecting valve which also has a stator which bears against the bead surrounding the opening of the skin, the rotor however being moved out of alignment when injection is terminated.
  • the thin skin does not provide a very strong retaining means for retaining the size and shape of the moulded product, and in prior art it has been customary to damage the cell structure of the internal foam so as to reduce the tension applied to the skin by continued expansion of the foam, and also to give the skin a softer "feel".
  • this invention use is made of the availability of pressure air to be applied between the die inner surface and the skin as the foam nears its full expansion, and this has the dual effect of compressing some of the cells and fracturing some of the membranes between cells of the foam contained within the skin and avoiding the need for a separate operation.
  • Fig. 1 is a sectional elevational view through a die, illustrating the skeletal frame, the skin in its collapsed form over the skeletal frame, and the internal surface of the die which forms the hollow, the walls of which provide the final skin shape;
  • Fig. 2 is a plan view of a closure disc which is applied to the article after moulding
  • Fig. 3 is a plan view of the moulding plate which is otherwise shown in section in Fig. 1;
  • Fig. 4 is a fragmentary plan view of a first end of the skeletal frame showing a spigot which engages and supports the moulding plate of Fig. 3;
  • Fig. 5 is a fragmentary end elevation which illustrates the spigot which is otherwise shown in Fig. 1 and Fig. 4;
  • Fig. 6 illustrates the second embodiment wherein a less dense foam has been pre-applied to the skeletal frame before it is inserted into the skin.
  • a die 10 comprises two portions which, when closed, define between them a hollow 11 which is defined by the respective surfaces of the die parts which are complementary in shape to the required final shape of the article to be produced, in this embodiment being a doll.
  • a skeletal frame 12 in this embodiment comprises a torso 13, two arms 14 in at least partly outstretched attitude as shown in Fig. 1, hands 15, legs 16 and feet 17. Articulation is provided by the hinges 18 which are in accordance with the aforesaid Patent Application PJ 9390, and relative rotation of the limbs is provided by the rotary joints 19.
  • the skin is designated 22 and is shown in semi-collapsed form in Fig. 1 over the skeletal frame 12.
  • the skin is formed from natural latex by the method disclosed in the aforesaid PCT Application AU90/00388, and in this embodiment has a thickness of about 0.2mm, but can range up to 0.6 or as high as 0.8mm. A very thin skin would be about 0.1mm thickness.
  • the skin is first applied to the skeletal frame 12, it is not fully cured but has had its moisture content reduced to between 3% and 5%, that is it is in a semi-cured state.
  • the skin is formed to have an upper circular bead 23 which is retained in an annular trough 24 (Fig.
  • the pressure is maintained by adjustment of the throttle valve 40 and also a bleed valve 41, excessive pressure being undesirable.
  • small pressure is sufficient that when foam-forming liquid 43 is" injected through the nozzle 29, the rate of foaming is constrained and the foam is urged to flow into the extremities of the skin.
  • the evacuation conduit 32 is closed during the injection process.
  • the rotor 28 When sufficient injection has taken place the rotor 28 is rotated over the moulding plate 27 to place the nozzle 21 out of alignment with aperture 30 and this functions as a shut-off valve, and at the same time shuts off the exhaust air passing out through the evacuation conduit 32.
  • the injecting valve 26 is removed from the moulding plate 27, the die is opened, and the closure disc 51 (Fig. 2) is located over the moulding plate 27, the closure disc 51 having projecting location pins 52 which locate in the apertures 53 of the moulding plate 27, while the central aperture 54 of the closure disc 51 locates over the upstanding spigot 34 of the skeletal frame 12.
  • a spacer ring 56 engages in the annular register 57 of the neck of a doll's head, while the inner retaining member 58 engages in a second register 59, and snaps over the head 60 of the spigot 34 to thereby retain the head of the doll to the skeletal frame 12 for relative movement which will take place between the spacer ring 56 and the closure disc 51.
  • the neck of the doll is shown in dotted lines and designated by the numeral 58.
  • Fig. 6 illustrates a second embodiment wherein the skeletal frame 12 has initially applied to it a less dense foam 61 in a relatively thin layer which enables it to be inserted into the skin 22 by stretching and distorting the bead 23 which surrounds the opening. Otherwise a similar series of method steps to those described above with respect to Figs. 1 through to 5 are used to cover the lesser density foam 61 with the denser foam as described with respect to the first embodiment.
  • the second embodiment does provide protection against tearing of the denser foam if excessive articulation of the limbs occurs.
  • the lower part of the skeletal frame 12 is located by forming the skin 22 to have protuberances 62 (not shown in Fig. 6), and these protuberances 62 are urged through apertures 63 by upstanding spigots 64 as shown on the right hand side foot of the skeletal frame in Fig. 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Procédé de moulage servant à mouler une mousse polyuréthane autour d'une structure en forme de squelette et à l'intérieur d'une pellicule en latex en insérant d'abord la structure dans la pellicule et en maintenant la structure (12) et la pellicule (22) dans le creux (11) d'une matrice femelle (10) dont la surface est complémentaire à la forme de l'article fini, en évacuant l'air de l'intérieur de la pellicule (22) afin que la pellicule s'affaisse et en injectant un liquide (43) formant de la mousse à l'intérieur de la pellicule (22) affaissée, afin de former une mousse qui dilatera la pellicule et l'amènera en contact avec la surface interne de la matrice tout en conservant une contre-pression d'air (38) peu élevée. La pression de l'air peut être très basse, de l'ordre de 0,3 psi et se situe normalement dans une gamme située entre 0,1 et 5 psi.
PCT/AU1991/000134 1990-04-10 1991-04-10 Moulage de mousse dans une pellicule elastomere Ceased WO1991015352A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AUPJ956490 1990-04-10
AUPJ9564 1990-04-10

Publications (1)

Publication Number Publication Date
WO1991015352A1 true WO1991015352A1 (fr) 1991-10-17

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ID=3774597

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1991/000134 Ceased WO1991015352A1 (fr) 1990-04-10 1991-04-10 Moulage de mousse dans une pellicule elastomere

Country Status (1)

Country Link
WO (1) WO1991015352A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730662A1 (fr) * 1995-02-17 1996-08-23 Robin Christian Procede et dispositif pour la fabrication de pieces moulees en matiere synthetique
EP1108454A4 (fr) * 1998-08-25 2005-11-02 Takara Co Ltd Poupee elastique et son procede de production

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305196A (en) * 1964-11-04 1967-02-21 Dow Chemical Co Vehicular structures made from foamed plastic materials
US4661391A (en) * 1984-03-02 1987-04-28 Noel, Marquet & Cie. S.A. Method of making a moulded body of foam plastics material
US4900489A (en) * 1985-01-11 1990-02-13 Toyota Jidosha Kabushiki Kaisha Method for forming a skin foam article
US4959184A (en) * 1987-10-31 1990-09-25 Ikeda Bussan Co., Ltd. Method of producing skin-covered foamed plastic article

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3305196A (en) * 1964-11-04 1967-02-21 Dow Chemical Co Vehicular structures made from foamed plastic materials
US4661391A (en) * 1984-03-02 1987-04-28 Noel, Marquet & Cie. S.A. Method of making a moulded body of foam plastics material
US4900489A (en) * 1985-01-11 1990-02-13 Toyota Jidosha Kabushiki Kaisha Method for forming a skin foam article
US4959184A (en) * 1987-10-31 1990-09-25 Ikeda Bussan Co., Ltd. Method of producing skin-covered foamed plastic article

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2730662A1 (fr) * 1995-02-17 1996-08-23 Robin Christian Procede et dispositif pour la fabrication de pieces moulees en matiere synthetique
EP1108454A4 (fr) * 1998-08-25 2005-11-02 Takara Co Ltd Poupee elastique et son procede de production

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