WO2000007794A1 - Obturateur de buse pour moulage par injection de gaz - Google Patents

Obturateur de buse pour moulage par injection de gaz Download PDF

Info

Publication number
WO2000007794A1
WO2000007794A1 PCT/GB1999/002290 GB9902290W WO0007794A1 WO 2000007794 A1 WO2000007794 A1 WO 2000007794A1 GB 9902290 W GB9902290 W GB 9902290W WO 0007794 A1 WO0007794 A1 WO 0007794A1
Authority
WO
WIPO (PCT)
Prior art keywords
gas
valve
nozzle
plastic
passage
Prior art date
Application number
PCT/GB1999/002290
Other languages
English (en)
Inventor
Christopher Paul Reade
Original Assignee
Crewe Precision Engineering 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 Crewe Precision Engineering Limited filed Critical Crewe Precision Engineering Limited
Publication of WO2000007794A1 publication Critical patent/WO2000007794A1/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
    • B29C45/20—Injection nozzles
    • B29C45/23—Feed stopping equipment
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1734—Nozzles therefor
    • B29C45/1735—Nozzles for introducing the fluid through the mould gate, e.g. incorporated in the injection nozzle
    • 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
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C2045/1718—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles sealing or closing the fluid injection opening

Definitions

  • the present invention relates to a nozzle valve.
  • the nozzle valve is
  • mould is normally through a nozzle attached to the machine cylinder.
  • shut-off valve which is normally located in the machine
  • gas is injected either at
  • moulding at the point of gas injection which may be at in-mould gas
  • a nozzle valve having a body defining a passage for plastic, means for closing
  • a method of gas assisted injection moulding including the steps of supplying
  • plastic material to a mould, applying gas pressure to assist in shutting off
  • activating the means for closing off the passage preferably comprises a
  • valve seat to add a force to that exerted by resilient means where such
  • a gas port is preferably provided through which gas under
  • the valve may be opened
  • the passage is preferably defined by a tubular
  • the valve is preferably
  • injection port exits the passage.
  • the means for isolating the gas injection isolating the gas injection
  • means for isolating is preferably provided and may comprise a second gas
  • Means may also
  • means may involve opening the means for opening the plastic passage again
  • gas may be used for the means for activating and for pressurising plastic in
  • the invention also comprises moulding apparatus comprising a nozzle as defined above.
  • a nozzle valve having a body defining a passage for plastic, means for
  • injection port from the passage and means for activating the means for
  • FIG. 1 diagrammatically illustrates apparatus for gas assisted injection
  • Figure 2 shows a perspective view of a known gas injection nozzle for
  • Figure 3 shows an exploded view of a gas injection nozzle according to
  • Figure 4 is a view in section of the valve of figure 3 in a first
  • Figure 5 is a view in section of the valve of figure 3 in a second
  • Figure 6 is a view in section of the valve of figure 3 in a third
  • Figure 7 is a view in section of the valve of figure 3 in a position in
  • Figure 8 is a view in section of the valve of figure 3 in an alternative
  • Figure 9 is a view in section of the valve of figure 3 in another
  • Figure 10 diagrammatically shows the sequence of steps in a first
  • FIG 11 diagrammatically shows the sequence of steps in a first
  • Figure 12 is a view in section of another embodiment of a gas injection nozzle according to the invention.
  • This invention provides a method and apparatus for combining the
  • the assembly for fitting between the cylinder head and the nozzle tip may be operated without any external moving parts, and it uses the already
  • the method of manufacture of the assembly is to be comparatively
  • this comprises means for feeding plastic to a mould 1 in
  • a shut off nozzle 5 connects the cylinder 3
  • rod 21 having an aperture 22 crosses passage 20 transversely.
  • the rod is rotatable by means of a worm gear arrangement 23 between a position in
  • aperture 22 is aligned with passage 20 to permit plastic to flow
  • Figure 3 shows an exploded view of a gas injection nozzle according
  • the nozzle comprises a nozzle body 30 which defines a
  • piston chamber 31 in which a piston 32 loaded by a spring 33 is disposed.
  • the nozzle body 30 also defines gas bores 34 and 35 and a gas channel 36.
  • a tubular member 37 defines a channel 38 for plastic and provides a conical
  • valve seat for a spherical or part spherical valve member 39.
  • the gas for both bores may be supplied from the same or
  • a nozzle tip 46 which is externally screwthreaded is screwed
  • the opening and closing of the plastic channel 38 is achieved by the
  • aperture 50 is opened for the plastic flow from the screw and cylinder
  • Control of the ball movement is affected by a combination of the
  • the spring 33 is selected so that the bail is normally in a closed
  • the piston 32 is hollow with one end open. The walls of the piston
  • the piston 32 are about 0.5mm thick.
  • the piston 32 is disposed so that gas supplied
  • gas port 35 flows into its open end. When gas is so supplied, it causes
  • the gas for the control of the nozzle flows through the bore 34 and
  • valve member 40 thereby permitting entry to the channel 44 so that the
  • process control gas will then flow through the channel 44 and internal gas
  • Gas in the mould may then be exhausted to atmosphere by the
  • a small slug of plastic may be injected by the limited forward movement of the screw.
  • the plastic nozzle consists of
  • Figure 10 shows a sequence in which the process control gas circuit
  • time (T) is
  • moulding cycle comprises a first stage from time A to B in which the plastic
  • valve is open (that is valve member 39 displaced from its valve seat) and
  • P1 is supplied through port 34 to shut off the plastic valve which remains
  • the moulding cycle comprises a first
  • valve member 39 displaced from its valve seat and plastic injected through
  • FIG. 12 Another form of nozzle is shown in figure 12. Referring to this figure,
  • the nozzle is similar to those shown in figures 3 to 9.
  • the nozzle is similar to those shown in figures 3 to 9.
  • nozzle comprises a nozzle body 90 which defines a piston chamber 91 in
  • a tubular member 97 defines a channel 98 for plastic and provides a conical valve seat for a
  • bore 95 leads into a gas channel 100 which in turn leads to an externally
  • gas nozzle 101 defines a conical valve seat 102 for a spherical or part
  • the spring 104 is retained in the nozzle 101 by means of a grub screw 105.
  • the grub screw 105 allows for adjustment of the
  • valve seat 102 valve member 103 and spring 104 define a
  • valve member 103 When no gas pressure is applied the valve member 103 will remain in contact with the valve seat 102 under the influence of
  • valve member 103 tend to urge the valve member 103 towards the valve seat 102.
  • the nozzle resists plastic pressure in opposing flow
  • a separate source of high pressure gas can be used

Landscapes

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

Abstract

L'invention concerne un obturateur de buse s'utilisant avec un appareil de moulage au gaz. L'obturateur de buse comporte un corps (30) définissant un passage (38) pour le plastique, et comprend un dispositif d'obturation du passage, ce dispositif pouvant être un clapet (39) à bille. Le corps (30) d'obturateur définit également un orifice (34) d'injection de gaz servant à injecter du gaz sous pression dans le plastique chargé dans le passage (38), et comprend un moyen servant à isoler (40) l'orifice (34) d'injection de gaz du passage (38) et un moyen servant à activer le moyen d'isolement (40) par la commande d'une pression de gaz. Le moyen servant à isoler l'orifice d'injection de gaz peut être un robinet (40) à pointeau sollicité par ressort, conçu pour s'ouvrir sous l'action d'une pression de gaz. Un moyen d'assistance du moyen d'obturation de passage (38) peut également être prévu sous la forme d'un piston (32) conçu pour fermer le clapet (39) à bille sous l'action d'une pression de gaz fournie via un orifice (35) de gaz supplémentaire.
PCT/GB1999/002290 1998-08-01 1999-07-30 Obturateur de buse pour moulage par injection de gaz WO2000007794A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9816719.0 1998-08-01
GBGB9816719.0A GB9816719D0 (en) 1998-08-01 1998-08-01 A nozzle valve

Publications (1)

Publication Number Publication Date
WO2000007794A1 true WO2000007794A1 (fr) 2000-02-17

Family

ID=10836504

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1999/002290 WO2000007794A1 (fr) 1998-08-01 1999-07-30 Obturateur de buse pour moulage par injection de gaz

Country Status (2)

Country Link
GB (1) GB9816719D0 (fr)
WO (1) WO2000007794A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107042621A (zh) * 2017-04-06 2017-08-15 华东交通大学 一种简易可靠的水辅助注塑工艺水气注排控制阀
CN108081551A (zh) * 2016-11-21 2018-05-29 柳道万和(苏州)热流道系统有限公司 热流道系统

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321160A2 (fr) * 1987-12-16 1989-06-21 Melea Limited Procédé de moulage par injection et buse utilisée à cet effet
DE3936290A1 (de) * 1989-08-22 1991-02-28 Battenfeld Gmbh Vorrichtung zum spritzgiessen von kunststoffmaterial nach dem injektionsverfahren
JPH04345816A (ja) * 1991-05-23 1992-12-01 Japan Steel Works Ltd:The 熱可塑性樹脂成形方法
JPH0577282A (ja) * 1991-04-25 1993-03-30 Meiki Co Ltd ガスインジエクシヨン成形用アタツチメント
JPH0732419A (ja) * 1993-07-21 1995-02-03 Akio Yasuike 射出成形用ダイ
DE4404672A1 (de) * 1994-02-15 1995-08-17 Schiffer Fa M & C Verfahren und Vorrichtung zur Herstellung von Bürsten
JPH08187750A (ja) * 1995-01-13 1996-07-23 Sekisui Chem Co Ltd 射出成形用ノズル

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0321160A2 (fr) * 1987-12-16 1989-06-21 Melea Limited Procédé de moulage par injection et buse utilisée à cet effet
DE3936290A1 (de) * 1989-08-22 1991-02-28 Battenfeld Gmbh Vorrichtung zum spritzgiessen von kunststoffmaterial nach dem injektionsverfahren
JPH0577282A (ja) * 1991-04-25 1993-03-30 Meiki Co Ltd ガスインジエクシヨン成形用アタツチメント
JPH04345816A (ja) * 1991-05-23 1992-12-01 Japan Steel Works Ltd:The 熱可塑性樹脂成形方法
JPH0732419A (ja) * 1993-07-21 1995-02-03 Akio Yasuike 射出成形用ダイ
DE4404672A1 (de) * 1994-02-15 1995-08-17 Schiffer Fa M & C Verfahren und Vorrichtung zur Herstellung von Bürsten
JPH08187750A (ja) * 1995-01-13 1996-07-23 Sekisui Chem Co Ltd 射出成形用ノズル

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 17, no. 201 (M - 1399) 20 April 1993 (1993-04-20) *
PATENT ABSTRACTS OF JAPAN vol. 17, no. 397 (M - 1452) 26 July 1993 (1993-07-26) *
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 05 30 June 1995 (1995-06-30) *
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 11 29 November 1996 (1996-11-29) *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108081551A (zh) * 2016-11-21 2018-05-29 柳道万和(苏州)热流道系统有限公司 热流道系统
CN108081551B (zh) * 2016-11-21 2024-01-30 柳道万和(苏州)热流道系统有限公司 热流道系统
CN107042621A (zh) * 2017-04-06 2017-08-15 华东交通大学 一种简易可靠的水辅助注塑工艺水气注排控制阀
CN107042621B (zh) * 2017-04-06 2023-04-07 华东交通大学 一种简易可靠的水辅助注塑工艺水气注排控制阀

Also Published As

Publication number Publication date
GB9816719D0 (en) 1998-09-30

Similar Documents

Publication Publication Date Title
US5204050A (en) Gas assisted injection molding
US4389358A (en) Method and apparatus for making an integral structural cellular and non-cellular plastic or resinous article with a smooth outer surface
JP2654959B2 (ja) 射出成形装置
US5200207A (en) Hot runner system for coinjection
JPS5829634A (ja) フオ−ムプラスチツク材料および／またはソリツドプラスチツク材料から部品を射出成形する装置
US6348171B1 (en) Drool control apparatus and method
US7168943B2 (en) Guided valve pin for an injection molding apparatus
US5200127A (en) Method and apparatus for gas assisted injection molding
US6793480B2 (en) Shutoff valve assembly
US6287494B1 (en) Gas introduction
US6716387B2 (en) Process for pressure assisted molding of hollow articles
US6630085B1 (en) Method for the multicomponent injection molding of plastic parts
WO2000007794A1 (fr) Obturateur de buse pour moulage par injection de gaz
WO1992002350A1 (fr) Dispositif a buse pour moulage et par injection
JP2794268B2 (ja) 合成樹脂中空体，発泡体等の成形用射出装置
JP4745288B2 (ja) 射出成形機用の射出ノズル
JPH08500301A (ja) 射出成形方法及び装置
US7314368B2 (en) Dual-cylinder injection molding apparatus
JPH09277307A (ja) ホットランナー装置とこれを組み込んだ射出成形用金型装置及びその使用方法
JP2004512196A (ja) ガス弁のピン機構
CA2536905A1 (fr) Pointeau de soupape multi-position pour appareil de moulage par injection
JPH07214618A (ja) 射出成形機におけるチェックリングの開閉装置
WO2002036323A9 (fr) Buse a obturateur pour moulage par co-injection avec chemins d'ecoulement de matiere separes
JPH0880549A (ja) プリプラ式射出成形機
US20040207131A1 (en) Apparatus and process for pressure assisted molding of hollow articles

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA CN GB US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE

121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase