WO2004065099A1 - Procede et dispositif de moulage par injection - Google Patents

Procede et dispositif de moulage par injection Download PDF

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Publication number
WO2004065099A1
WO2004065099A1 PCT/EP2003/000552 EP0300552W WO2004065099A1 WO 2004065099 A1 WO2004065099 A1 WO 2004065099A1 EP 0300552 W EP0300552 W EP 0300552W WO 2004065099 A1 WO2004065099 A1 WO 2004065099A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection
plasticized
injection device
valve
accumulator
Prior art date
Application number
PCT/EP2003/000552
Other languages
English (en)
Inventor
Pietro Martini
Giuseppe Pastore
Original Assignee
Tetra Laval Holdings & Finance S.A.
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 Tetra Laval Holdings & Finance S.A. filed Critical Tetra Laval Holdings & Finance S.A.
Priority to AU2003303756A priority Critical patent/AU2003303756A1/en
Priority to PCT/EP2003/000552 priority patent/WO2004065099A1/fr
Publication of WO2004065099A1 publication Critical patent/WO2004065099A1/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
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/53—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston
    • B29C45/54—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw
    • B29C45/542—Means for plasticising or homogenising the moulding material or forcing it into the mould using injection ram or piston and plasticising screw using an accumulator between plasticising and injection unit, e.g. for a continuously operating plasticising screw

Definitions

  • the invention relates to a method for injection moulding and to an apparatus for an injection moulding machine according to the first parts of claims 1 and 2.
  • EP 0 868 276 Bl It is known from EP 0 868 276 Bl to prepare plasticized plastic material by a plasticizing device, in particular by screw plasticizing and to supply the plasticized material to an injection device from which the plasticized material can be injection moulded during an operating stroke of an injection piston within said injection device.
  • a plasticizing device in particular by screw plasticizing and to supply the plasticized material to an injection device from which the plasticized material can be injection moulded during an operating stroke of an injection piston within said injection device.
  • GB 2 101 034 A In order to be able to continuously drive the plasticizing screw it is also known from GB 2 101 034 A to temporarily store plasticized material within an accumulator, comprising a pressurized space.
  • a multi-directional valve is installed between the accumulator and the injection device. It is also known from EP 0 868 276 Bl to use a non-return valve.
  • the invention according to method claim 1 is characterized by a valve which is at least partially rotated from a closing position into an opened position, wherein the rotation of said rotatable valve is controlled by external signals.
  • a valve which is at least partially rotated from a closing position into an opened position, wherein the rotation of said rotatable valve is controlled by external signals.
  • In the closing position no plasticized material is being transferred from the injection device back into the space while, in the opened position, plasticized plastic material is allowed to be transferred from the space of the accumulator into the injection device, namely into the injection chamber.
  • the injection moulding and the filling of the injection chamber on the one hand and of the pressure in the space of the accumulator is better controllable by external signals.
  • the valve is at least partially rotatable wherein a controlling device controls the degree of rotation as well as the start and stop of the rotation of the valve dependent on external signals. It is preferred to use external signals.
  • Fig. 1 a schematically sketch of the invention
  • Fig. 2 a sectional view of parts of the invention
  • Fig. 3 a sectional view according to Section C-C of Fig. 1;
  • Fig. 4 a sectional view according to Section E-E of Fig. 2 and
  • Fig. 5 a sectional view according to Section D-D of Fig. 2.
  • Plastic material a and raw material for injection moulding, respectively, is introduced into a plasticizing cylinder 1 through a hopper lm. From the cylinder 1 plasticized material is supplied through the transfer line b into an accumulator 3 which at least partially and temporarily stores plasticized material. From the accumulator 3 plasticized material can be transferred via the transfer line c to an interposed rotatable valve 4 being controlled by a controlling device 6, and from the rotatable valve 4 via the transfer line d into the injection cylinder 2.
  • the controlling device 6 can be formed by a rotable pneumatic cylinder or by an electrical stepper motor as an actuator.
  • Plasticized injection material e is pressed out from an injection nozzle 5 around a needle part 14c within the exit part 2c of the injection cylinder 2. The needle 14 is inserted into said injection cylinder 2 and can be axially moved within said cylinder 2.
  • the plasticizing cylinder 1 comprises a plasticizing screw la which can be continuously rotated so that plasticized material can be transferred through the valve 7 into a space 3a of the accumulator 3 and, depending on the opening position, through the valve 4 into the injection chamber 2b of the injection device 2.
  • the rotatable valve 4 closes in order to avoid that plasticized material 2b contained in the injection chamber 2b returns into the space 3a which space 3a, now, starts to become pressurized due to the continuous supply of plasticized material delivered from the plasticising cylinder la.
  • all of the plasticized plastic material within the injection chamber 2b can be injected through the injection nozzle 5 into the tool or mould 8 for injection moulding.
  • the valve can be useful when the apparatus is to be stopped. If the space 3a is still pressurized there is some plastic leakage through the screw back to the feeding unit which leakage can be controlled by said valve 7.
  • the plasticized material can be pressed through the injection nozzle 5 into an annular channel 8a within the mould 8 and through an opening 8b into the mould cavity.
  • the lower needle part 14c can close, in its lowered closing position, said opening 8b.
  • Figure 3 shows - in a sectional view - an embodiment of the rotatable valve 4 and its through-passage 4a which is in the closed or blocking condition in figure 3 so that there is no connection between the injection chamber 2b and the pressurized space 3a of the accumulator 3.
  • Figure 5 shows a view according to D-D of Fig. 2.
  • the controlling signals for controlling the controlling device 6 and the rotatable valve 4, respectively, can be external signals.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

Pour mieux contrôler le moulage par injection au moyen d'un piston d'injection (2a) à l'intérieur d'un dispositif d'injection (2), au lieu d'une vis plastifiante à rotation continue (1a) d'un dispositif plastifiant (1), une vanne tournante (4) est mobile d'une position de fermeture, dans laquelle aucune matière plastifiée n'est retransférée du dispositif d'injection (2) dans l'espace (3a) d'un accumulateur (3) pour matière plastifiée, à une position ouverte, dans laquelle la matière plastique plastifiée peut être transférée dudit espace (3a) dans le dispositif d'injection (2), le mouvement de rotation de ladite vanne additionnelle (4) étant commandé par des signaux extérieurs.
PCT/EP2003/000552 2003-01-21 2003-01-21 Procede et dispositif de moulage par injection WO2004065099A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003303756A AU2003303756A1 (en) 2003-01-21 2003-01-21 Method and device of injection moulding
PCT/EP2003/000552 WO2004065099A1 (fr) 2003-01-21 2003-01-21 Procede et dispositif de moulage par injection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2003/000552 WO2004065099A1 (fr) 2003-01-21 2003-01-21 Procede et dispositif de moulage par injection

Publications (1)

Publication Number Publication Date
WO2004065099A1 true WO2004065099A1 (fr) 2004-08-05

Family

ID=32748743

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/000552 WO2004065099A1 (fr) 2003-01-21 2003-01-21 Procede et dispositif de moulage par injection

Country Status (2)

Country Link
AU (1) AU2003303756A1 (fr)
WO (1) WO2004065099A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05131509A (ja) * 1991-11-11 1993-05-28 Toshiba Mach Co Ltd 連続可塑化式射出成形方法
DE19849797A1 (de) * 1997-11-05 1999-05-06 Ulysses Injection S R I Injektor und Injektionsverfahren, insbesondere für thermoplastisches Material
WO2002060671A1 (fr) * 2001-01-31 2002-08-08 Decoma International Inc. Buse d'injection

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05131509A (ja) * 1991-11-11 1993-05-28 Toshiba Mach Co Ltd 連続可塑化式射出成形方法
DE19849797A1 (de) * 1997-11-05 1999-05-06 Ulysses Injection S R I Injektor und Injektionsverfahren, insbesondere für thermoplastisches Material
WO2002060671A1 (fr) * 2001-01-31 2002-08-08 Decoma International Inc. Buse d'injection

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 017, no. 507 (M - 1479) 13 September 1993 (1993-09-13) *
WOBBE H ET AL: "SPRITZGIESSEN UND COMPOUNDIEREN KOMBINIERT DIE EINSPARUNG LIEGT AUF DER HAND", PLASTVERARBEITER, ZECHNER UND HUETHIG VERLAG GMBH. SPEYER/RHEIN, DE, vol. 52, no. 2, 1 February 2001 (2001-02-01), pages 52 - 54, XP001003190, ISSN: 0032-1338 *

Also Published As

Publication number Publication date
AU2003303756A1 (en) 2004-08-13

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