WO1992003273A1 - Machine destinee a former des articles en materiaux thermoplastiques - Google Patents

Machine destinee a former des articles en materiaux thermoplastiques Download PDF

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Publication number
WO1992003273A1
WO1992003273A1 PCT/AU1991/000391 AU9100391W WO9203273A1 WO 1992003273 A1 WO1992003273 A1 WO 1992003273A1 AU 9100391 W AU9100391 W AU 9100391W WO 9203273 A1 WO9203273 A1 WO 9203273A1
Authority
WO
WIPO (PCT)
Prior art keywords
barrel
mould
machine
cavity
hopper
Prior art date
Application number
PCT/AU1991/000391
Other languages
English (en)
Inventor
Edwin Henry Whatson
Original Assignee
Rema Industries & Services Pty. Ltd.
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 Rema Industries & Services Pty. Ltd. filed Critical Rema Industries & Services Pty. Ltd.
Publication of WO1992003273A1 publication Critical patent/WO1992003273A1/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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/388—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length into moving moulds
    • 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
    • B29C44/34—Auxiliary operations
    • B29C44/3442—Mixing, kneading or conveying the foamable material
    • 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
    • B29C45/03—Injection moulding apparatus
    • B29C45/04—Injection moulding apparatus using movable moulds or mould halves
    • B29C45/0441—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement
    • B29C45/045—Injection moulding apparatus using movable moulds or mould halves involving a rotational movement mounted on the circumference of a rotating support having a rotating axis perpendicular to the mould opening, closing or clamping direction

Definitions

  • the proposed invention relates to plastics, extrusion and moulding machines and processes, and more particularly but not exclusively to such apparatus and processes when adapted to mould products from thermoplastic materials.
  • Extrusion machines consist of a gravity-feed hopper which delivers raw material to a barrel. Located within the barrel is a screw conveyor which forwards the material along the barrel. The barrel is heated so that as material travels along the barrel, it picks up heat by conduction to supplement the heat generated by the shearing action of the screw flights as they force the material forward. In some instances, the shearing action generates sufficient heat and may actually require cooling of the barrel rather than heating. However, the barrel needs to be heated when the process is initiated.
  • the molten plastic is forced through a die and cooled into either a flat or tubular sheet form. This material is subsequently delivered to a forming machine which produces the finished article.
  • This process has the disadvantage that there is considerable scrap and there is a two-stage process which is time consuming, costly and requires two separate machines, (Extrusion and thermoforming).
  • two extruder machines are normally required. The first to mix and heat the plastic and to introduce the gas, the second to cool the molten material before it is forced through a die.
  • the sheet produced normally needs to be stored prior to thermofor ing. Whether foamed or unfoamed a large capital investment is required.
  • Injection moulding is characterised by its step-by-step method of operation, so that when the plattens are open the moulds are no longer able to receive further material, significantly slowing the process. Additionally, extremely high pressures are required to clamp and keep the mould parts together during injection.
  • an extrusion/moulding machine to form product from thermoplastic materials, said machine comprising: a feed hopper into which the thermoplastic material is delivered; a barrel communicating at one end with said hopper to receive material therefrom; a mould assembly communicating with the other end of said barrel to receive said material from said barrel; a screw conveyor within said barrel to transport said material from said hopper to said mould assembly; means to heat said barrel; means to deliver a blowing agent to said barrel adjacent to said other end; and wherein said mould assembly includes a mould cavity, a branch duct extending from said cavity to said barrel to deliver blown or unblown material from said barrel to the cavity.
  • an extrusion/moulding process comprising: providing a supply of thermoplastic material; screw conveying the material to a mould cavity; heating the material while being conveyed to said cavity; and introducing into said material a blowing agent at a downstream position during conveying of said material.
  • the mould or moulds could be closed and mounted for rotational or reciprocating movement.
  • Figure 1 is a schematic side elevation of an extrusion/moulding machine
  • Figure 2 is a schematic side elevation of the machine of Figure 1.
  • the extrusion/moulding machine 10 is adapted to receive a supply of thermoplastic granular material such as polystyrene granules.
  • the granules are not pre-expanded.
  • the raw material could also contain starch or other naturally renewable resources or materials to make the articles produced, degenerate with time.
  • the raw material is fed to a feed hopper 11 which delivers the material under the influence of gravity to a barrel 12.
  • a screw conveyor 13 Located within the barrel is a screw conveyor 13 which is rotatably driven to convey the raw material in the direction of the arrow 14.
  • the barrel 12 is heated so that the granular material becomes molten by the time it reaches the downstream end 15 of the barrel 12. It may be necessary once the process has reached a steady state condition, to cool the barrel 12 as shearing of the raw material due to the action of the screw conveyor 13 will generate sufficient heat to cause the material to reach a molten state.
  • the above portion of the machine 10 comprises the extrusion apparatus 23.
  • the molten material is delivered to a mould assembly 16, which in this embodiment includes a rotatably driven hub 17 from which there extends branch ducts 18 to mould cavities 19.
  • the mould cavities 19 are defined between male die members 20 and female die members 21.
  • the machine 10 is provided with a further duct 22 through which a blowing or foaming agent may be introduced into the molten material.
  • the molten material is conveyed to the mould cavities 19 by the pressure generated by the screw conveyor 13.
  • the branch ducts 18 could be provided with smaller screw conveyors to aid in conveying the material. It may also be advantageous to heat the branch ducts 18.
  • a plunger arrangement may be used to meter and convey a correct amount of material .
  • the mould assembly 16 includes a rotatably driven hub 17 as described above.
  • the hub 17 rotates so as to sequentially provide communication between the branch ducts 18 and the barrel 12.
  • a first pre-determined angle as selected one of the branch ducts 18 communicates with barrel 12 and receives material therefrom to be delivered to the mould cavity 19.
  • the branch duct 18 As it passes through a second pre- determined angle, the branch duct 18, is isolated from the barrel 12.
  • the mould cavity 19 is cooled together with the product located therein.
  • the product is subsequently ejected after passing through a further angle.
  • the cavity 19 then rotates to its initial start position where it communicates with the barrel 12 so as to receive a fresh charge of molten material.
  • polystyrene granule material is used rather than pre-gassed bead material.
  • the foamed material is delivered directly into the mould cavity rather than firstly to an extruder from where it is rolled and possibly stored.
  • by forming the product in a "rotary manner" the efficiency of the process is considerably increased as it is not a "step-by-step” operation.
  • the proposed process will operate at relatively low moulding pressures compared to conventional injection moulding.
  • the process also offers the opportunity to print the moulded product in-line, rather than off-line as is normally the case.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Machine d'extrusion et de moulage (10) destinée à former des produits à partir de matériaux thermoplastiques. Ladite machine (10) comporte une trémie d'alimentation (11) qui reçoit des granules de polystyrène. Un cylindre (12) entourant une hélice transporteuse (13) est situé dans le prolongement de la trémie (11). Les granules venant de la trémie (11) sont déversés dans le cylindre (12) et sont transportés par l'hélice transporteuse (13) vers un ensemble de moulage (16). Un gonflant est introduit dans le cylindre (12) à une position située en aval de la trémie (11). L'ensemble de moulage (16) comprend une pluralité de cavités de moulage (19) qui sont disposées de manière à effectuer un mouvement rotatif ou réciproque afin que chaque cavité (19) communique séquentiellement avec le cylindre (12) en vue de recevoir de ce dernier le matériau thermoplastique.
PCT/AU1991/000391 1990-08-23 1991-08-23 Machine destinee a former des articles en materiaux thermoplastiques WO1992003273A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AUPK1909 1990-08-23
AUPK190990 1990-08-23
AUPK429691 1991-01-22
AUPK4296 1991-01-22

Publications (1)

Publication Number Publication Date
WO1992003273A1 true WO1992003273A1 (fr) 1992-03-05

Family

ID=25643929

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/AU1991/000391 WO1992003273A1 (fr) 1990-08-23 1991-08-23 Machine destinee a former des articles en materiaux thermoplastiques

Country Status (1)

Country Link
WO (1) WO1992003273A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013155550A1 (fr) * 2012-04-18 2013-10-24 Blh Safety Corporation Pty Ltd Panneau de barrière et/ou de protection en treillis

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1380058A (fr) * 1964-01-10 1964-11-27 Ankerwerk Gebr Goller Fa Machine de moulage par injection pour la réalisation de pièces en matières réticulables
FR2072042A1 (fr) * 1969-12-24 1971-09-24 Huels Chemische Werke Ag
US3707342A (en) * 1970-12-21 1972-12-26 Mannesman Meer Ag Injection molding apparatus for foamed plastics
FR2343590A1 (fr) * 1976-03-13 1977-10-07 Asahi Dow Ltd Procede et dispositif pour le moulage par injection d'objets a paroi epaisse, notamment en matieres expansees
US4067673A (en) * 1975-09-02 1978-01-10 Ex-Cell-O Corporation Apparatus for injection foam molding
JPS55291A (en) * 1979-05-02 1980-01-05 Asahi Chem Ind Co Ltd Production of form product
US4187352A (en) * 1977-04-19 1980-02-05 Lankhorst Touwfabrieken B.V. Method and apparatus for producing synthetic plastics products, and product produced thereby
US4390332A (en) * 1981-07-06 1983-06-28 Kmmco Structural Foam, Inc. Apparatus for injection molding of parts from foam plastics material and/or from solid plastics material
GB2139548A (en) * 1983-05-11 1984-11-14 James Watson Hendry Injection moulding
FR2612831A1 (fr) * 1987-03-24 1988-09-30 Clenet Jacques Machine d'extrusion-moulage a plusieurs moules montes en barillets pour pieces en matiere plastique et matiere similaire
US4828778A (en) * 1985-05-29 1989-05-09 Monsanto Company Method for continuous injection molding

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1380058A (fr) * 1964-01-10 1964-11-27 Ankerwerk Gebr Goller Fa Machine de moulage par injection pour la réalisation de pièces en matières réticulables
FR2072042A1 (fr) * 1969-12-24 1971-09-24 Huels Chemische Werke Ag
US3707342A (en) * 1970-12-21 1972-12-26 Mannesman Meer Ag Injection molding apparatus for foamed plastics
US4067673A (en) * 1975-09-02 1978-01-10 Ex-Cell-O Corporation Apparatus for injection foam molding
US4155969A (en) * 1975-09-02 1979-05-22 Ex-Cell-O Corporation Method for injection foam molding
FR2343590A1 (fr) * 1976-03-13 1977-10-07 Asahi Dow Ltd Procede et dispositif pour le moulage par injection d'objets a paroi epaisse, notamment en matieres expansees
US4187352A (en) * 1977-04-19 1980-02-05 Lankhorst Touwfabrieken B.V. Method and apparatus for producing synthetic plastics products, and product produced thereby
JPS55291A (en) * 1979-05-02 1980-01-05 Asahi Chem Ind Co Ltd Production of form product
US4390332A (en) * 1981-07-06 1983-06-28 Kmmco Structural Foam, Inc. Apparatus for injection molding of parts from foam plastics material and/or from solid plastics material
GB2139548A (en) * 1983-05-11 1984-11-14 James Watson Hendry Injection moulding
US4828778A (en) * 1985-05-29 1989-05-09 Monsanto Company Method for continuous injection molding
FR2612831A1 (fr) * 1987-03-24 1988-09-30 Clenet Jacques Machine d'extrusion-moulage a plusieurs moules montes en barillets pour pieces en matiere plastique et matiere similaire

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, M-1, page 20; & JP,A,55 000 291 (ASAHI DOW K.K.), 5 January 1980 (05.01.80). *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013155550A1 (fr) * 2012-04-18 2013-10-24 Blh Safety Corporation Pty Ltd Panneau de barrière et/ou de protection en treillis

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