WO1999059795A1 - Moule a injection - Google Patents

Moule a injection Download PDF

Info

Publication number
WO1999059795A1
WO1999059795A1 PCT/CH1999/000206 CH9900206W WO9959795A1 WO 1999059795 A1 WO1999059795 A1 WO 1999059795A1 CH 9900206 W CH9900206 W CH 9900206W WO 9959795 A1 WO9959795 A1 WO 9959795A1
Authority
WO
WIPO (PCT)
Prior art keywords
nozzle
injection molding
pressure
molding tool
pressure sensor
Prior art date
Application number
PCT/CH1999/000206
Other languages
German (de)
English (en)
Inventor
Otto Hofstetter
Luis Fernandez
Original Assignee
Otto Hofstetter Ag Werkzeug- Und Formenbau
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 Otto Hofstetter Ag Werkzeug- Und Formenbau filed Critical Otto Hofstetter Ag Werkzeug- Und Formenbau
Priority to JP2000549444A priority Critical patent/JP2002515362A/ja
Priority to CA002331576A priority patent/CA2331576A1/fr
Priority to EP99919017A priority patent/EP1077799A1/fr
Publication of WO1999059795A1 publication Critical patent/WO1999059795A1/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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • 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
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2701—Details not specific to hot or cold runner channels
    • B29C2045/2722—Nozzles or runner channels provided with a pressure sensor

Definitions

  • the present invention relates to an injection molding tool for the injection molding of plastic moldings according to the preamble of claim 1.
  • Tools for the injection molding of multilayer moldings made of plastic materials and in particular PET-like materials have been known for a long time and are mainly used in the production of preforms, such as those required by the beverage industry for their so-called PET bottles in large quantities.
  • Exceptionally high demands are placed on these tools, as special attention must be paid to the processing of PET, PEN and their copolymers, as well as nylon, whose material-specific characteristics.
  • the processing temperature of these plastics proves to be particularly critical. They are also extremely sensitive to pressure fluctuations and shear forces. In particular, such and other parameters influence the uniformity, homogeneity of the layer thickness and the density distribution within the preforms produced.
  • Particularly high demands are placed on tools with which multilayer preforms can be injected.
  • Methods for producing multilayer preforms are known, for example, from US 4,609,516.
  • the preforms described in this document have five layers, of which at least one layer consists of a barrier layer material, while the other layers consist of thermoplastic materials known in injection molding technology.
  • Barrier layers are used in preforms to reduce the gas permeability of the containers formed from these preforms.
  • barrier layer materials Compared to the known thermoplastic materials, barrier layer materials have a gas impermeability two to three times higher; however, they are also eight times as expensive. The comparatively high price of barrier layer materials makes it necessary to use them sparingly without adversely affecting their desired functions.
  • No. 4,609,516 therefore proposes to limit the materials introduced into an injection mold quantitatively by means of volume specifications. This is to ensure that only the required minimum amount of barrier layer material is introduced between the other layers.
  • Pressure sensors are known in the field of injection molding technology, with which the pressure in the cavities can be measured in order to be able to determine the filling quantity.
  • the aim here is to fully monitor each individual cavity for overspraying, ie overfilling, or for insufficient filling.
  • an impression of the measuring window of the pressure sensors is of minor importance in the manufacture of simple plastic containers - but are not tolerable in the manufacture of preforms as used in the beverage industry. Such imprints form a defect that can lead to tearing when these preforms are stretched.
  • the invention is therefore based on the object of providing an injection molding tool which enables the filling of the individual cavities to be monitored in a simple manner and while avoiding the disadvantages indicated.
  • Blown bars here mean any type of mold in which preforms are inflated via a blow mandrel or through an attached nozzle for the production of containers, in particular for the packaging industry.
  • Such methods of blow stretching are known and are used in particular in injection molding blow molding or stretch blow molding.
  • Stretch blow molding is characterized in particular by the fact that the strengthened shape of the container is increased by two-axis stretching.
  • Fig. 1 cross section through an injection nozzle for the
  • FIG. 2 shows a cross section through an injection molding nozzle for the production of multilayer preforms
  • FIG. 1 shows a section of an injection mold 2 with spray nozzles 1 for the production of simply filled preforms.
  • this nozzle 1 is constructed in several parts and has a nozzle head 3 which is fastened in a nozzle body 4.
  • a nozzle closure pin 7 is guided in a nozzle insert 5.
  • a plastic melt A is conveyed from a feed line 9 into a nozzle channel 6 of the nozzle 1.
  • This nozzle channel 6 is according to the invention equipped with means for measuring the pressure, and in particular with a pressure sensor.
  • This pressure sensor can be arranged in the nozzle body 4, directly behind a measuring window 18, or, because of the high mold temperature, can be fastened outside the nozzle body 4 with the aid of a means for transmitting the pressure that occurs in the nozzle channel 6 during injection molding.
  • This means can be a mechanical or hydraulic device.
  • the geometric arrangement of one or more supply lines 16 to the pressure sensor is adapted to the geometric structure of the nozzle.
  • these feed lines 16 connect the pressure sensor arranged directly behind the measuring window 18 to an electronic circuit (not shown) for monitoring and / or controlling the filling process.
  • these feed lines 16 serve to transmit the pressure that occurs in the injection channel in the nozzle channel 6.
  • feed lines 16 lie in a bore 10 which, depending on the geometric structure of the nozzle 1, is essentially parallel or transverse to the conveying direction of the Nozzle 1 or to the nozzle axis.
  • the person skilled in the art will attempt to arrange the measuring window 18 as close as possible to the tip of the nozzle and to guide the feed lines 16 past one or more heating elements 17.
  • FIG. 2 shows an injection molding nozzle 1 of a tool 2 suitable for the production of multilayer preforms.
  • This nozzle 1 is constructed in several parts and essentially comprises one Nozzle head 3 which is fastened in a nozzle body 4.
  • a nozzle insert 5 is arranged in the interior of the nozzle 1, in the interior of which a first nozzle channel 6 and a nozzle closure pin 7 are located.
  • the nozzle insert 5 is dimensioned such that a second, ring-shaped nozzle channel 8 is formed between it and the nozzle head 3.
  • This nozzle 1 is arranged in the tool 2 such that its first nozzle channel 6 communicates with a first supply line 9 and its second nozzle channel 8 communicates with a second supply line 11.
  • a first plastic material A in particular PET
  • a second plastic material B preferably a barrier material made of nylon or the like
  • the blocking material B can thus be introduced into the interior of the three-layer preform that is formed in the mold cavity 12.
  • the nozzle 1 has a pressure sensor 13 arranged in the nozzle body 4.
  • This pressure sensor 13 comprises a sensor head 14, which is fastened in a pressure-resistant housing part 15 in the nozzle body 4 and is connected via a feed line 16 to an evaluation device (not shown), in particular an electronic circuit for monitoring and / or controlling the filling process.
  • an evaluation device not shown
  • a pressure in the range from 0 to 2000 bar, in particular in the range from 300 to 400 bar can be measured with this sensor and the pressure sensor 13 is suitable for withstanding temperatures, at least briefly, of up to 400 ° C. without damage.
  • Such pressure sensors are well known to the person skilled in the field of sensor technology. With the arrangement shown in FIG. 2, the pressure of the material B in the flowable state (melt) and in the immediate vicinity of the
  • Measure mold cavity 12 Depending on the space available within the nozzle 1 and the size of the pressure sensors used the person skilled in the art should arrange the bores 10 essentially parallel or transversely to the conveying direction of the nozzle.
  • the nozzle shown can also be operated such that the first plastic material is conveyed through the first nozzle channel 6 and the second plastic material through the second nozzle channel 8. With this mode of operation, the pressure of the first plastic material in the first nozzle channel 6 can be measured.
  • the person skilled in the art knows that such a nozzle can also be used for the production of five- or multi-layer preforms. It is also in the area of professional skill to design injection molding nozzles for several, different plastic materials with several nozzle channels and to equip them with suitable pressure sensors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

L'invention concerne un moule à injection destiné au moulage à injection de pièces moulées en plastique. Ce moule présente plusieurs buses (1) équipées de moyens de mesure de la pression régnant dans le canal (6, 8) de la buse (1) lors du moulage par injection. Ces moyens, notamment des détecteurs électroniques de pression (13), permettent de contrôler la pression de remplissage et de commander l'opération de remplissage.
PCT/CH1999/000206 1998-05-15 1999-05-14 Moule a injection WO1999059795A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2000549444A JP2002515362A (ja) 1998-05-15 1999-05-14 射出成形用工具
CA002331576A CA2331576A1 (fr) 1998-05-15 1999-05-14 Moule a injection
EP99919017A EP1077799A1 (fr) 1998-05-15 1999-05-14 Moule a injection

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH108298 1998-05-15
CH1082/98 1998-05-15

Publications (1)

Publication Number Publication Date
WO1999059795A1 true WO1999059795A1 (fr) 1999-11-25

Family

ID=4202045

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CH1999/000206 WO1999059795A1 (fr) 1998-05-15 1999-05-14 Moule a injection

Country Status (4)

Country Link
EP (1) EP1077799A1 (fr)
JP (1) JP2002515362A (fr)
CA (1) CA2331576A1 (fr)
WO (1) WO1999059795A1 (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6254377B1 (en) 1998-04-21 2001-07-03 Synventive Molding Solutions, Inc. Manifold system having flow control using extended valve pin
US6287107B1 (en) 1997-09-02 2001-09-11 Synventive Molding Solutions, Inc. Apparatus for proportionally controlling fluid delivery to a mold
US6309208B1 (en) 1997-06-13 2001-10-30 Synventive Molding Solutions, Inc. Apparatus for proportionally controlling fluid delivery to a mold
US6514440B1 (en) 1998-04-21 2003-02-04 Synventive Molding Solutions, Inc. Apparatus and method for purging injection molding system
US6585505B2 (en) 1998-04-21 2003-07-01 Synventive Molding Solutions, Inc. Machine for proportionally controlling fluid delivery to a mold
US6589039B1 (en) 1998-04-21 2003-07-08 Synventive Molding Solutions, Inc. Controlled injection using manifold having multiple feed channels
US6632079B1 (en) 1998-04-21 2003-10-14 Synventive Molding Solutions, Inc. Dynamic feed control system
US6638049B1 (en) 1997-06-13 2003-10-28 Synventive Molding Solutions, Inc. Apparatus and method for proportionally controlling fluid delivery to readily replaceable mold inserts
US6683283B2 (en) 2002-05-10 2004-01-27 Dynisco Hot Runners Inc. Canada Apparatus and method for heating injection molding fluid
US6769896B2 (en) 1998-04-21 2004-08-03 Synventive-Molding Solutions, Inc. Manifold system having flow control
US6824379B2 (en) 1998-04-21 2004-11-30 Synventive Molding Solutions, Inc. Apparatus for utilizing an actuator for flow control valve gates
US7029268B2 (en) 2001-12-26 2006-04-18 Synventive Molding Solutions, Inc. Non-coaxial injection molding valve flow control
US7182893B2 (en) 2002-10-11 2007-02-27 Mold-Masters Limited Valve gated nozzle having a valve pin with a sensor
US7234929B2 (en) 1999-09-21 2007-06-26 Synventive Molding Solutions, Inc. Injection molding flow control apparatus and method
WO2007140447A1 (fr) * 2006-05-31 2007-12-06 Graham Packaging Company, Lp Commande de la distribution de matériau polymère dans un processus de moulage par injection séquentielle
US7527490B2 (en) 2006-10-13 2009-05-05 Mold-Masters (2007) Limited Coinjection molding apparatus and related hot-runner nozzle

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100439076C (zh) 2001-10-12 2008-12-03 标准模具（2007）有限公司 带有热电偶的阀销
CA2530031C (fr) * 2003-01-31 2009-01-13 Otto Hofstetter Ag Buse de co-injection
CN101758603B (zh) * 2009-08-27 2012-10-17 东莞市热恒注塑科技有限公司 一种用于大型注塑模具的热流道系统之转角型热嘴
KR101252574B1 (ko) * 2011-02-18 2013-04-09 지이엠(주) 사출성형 금형의 핫 런너 시스템용 이중밸브핀 노즐장치
KR101252576B1 (ko) * 2011-02-18 2013-04-09 지이엠(주) 사출성형 금형의 핫 런너 시스템용 복수 개의 수지통로들을 지닌 복수 유로 조립형 노즐

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124244A1 (fr) * 1983-03-31 1984-11-07 Fujitsu Limited Procédé et dispositif de moulage par transfert
JPS60212321A (ja) * 1984-04-06 1985-10-24 Yazaki Kako Kk 射出圧縮成形における樹脂量制御方法
DE8904028U1 (fr) * 1989-04-01 1989-06-29 Frey, Ingeborg, 8520 Erlangen, De
JPH01320126A (ja) * 1988-06-21 1989-12-26 Nok Corp 射出成形機の射出圧力制御方法
JPH04138234A (ja) * 1990-09-29 1992-05-12 Sekisui Chem Co Ltd 射出成形機の制御装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0124244A1 (fr) * 1983-03-31 1984-11-07 Fujitsu Limited Procédé et dispositif de moulage par transfert
JPS60212321A (ja) * 1984-04-06 1985-10-24 Yazaki Kako Kk 射出圧縮成形における樹脂量制御方法
JPH01320126A (ja) * 1988-06-21 1989-12-26 Nok Corp 射出成形機の射出圧力制御方法
DE8904028U1 (fr) * 1989-04-01 1989-06-29 Frey, Ingeborg, 8520 Erlangen, De
JPH04138234A (ja) * 1990-09-29 1992-05-12 Sekisui Chem Co Ltd 射出成形機の制御装置

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 66 (M - 461) 15 March 1986 (1986-03-15) *
PATENT ABSTRACTS OF JAPAN vol. 14, no. 127 (M - 947) 9 March 1990 (1990-03-09) *
PATENT ABSTRACTS OF JAPAN vol. 16, no. 410 (M - 1302) 28 August 1992 (1992-08-28) *

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6638049B1 (en) 1997-06-13 2003-10-28 Synventive Molding Solutions, Inc. Apparatus and method for proportionally controlling fluid delivery to readily replaceable mold inserts
US6309208B1 (en) 1997-06-13 2001-10-30 Synventive Molding Solutions, Inc. Apparatus for proportionally controlling fluid delivery to a mold
US6287107B1 (en) 1997-09-02 2001-09-11 Synventive Molding Solutions, Inc. Apparatus for proportionally controlling fluid delivery to a mold
US7569169B2 (en) 1998-04-21 2009-08-04 Synventive Molding Solutions, Inc. Injection molding flow control apparatus and method
US6514440B1 (en) 1998-04-21 2003-02-04 Synventive Molding Solutions, Inc. Apparatus and method for purging injection molding system
US8016581B2 (en) 1998-04-21 2011-09-13 Synventive Molding Solutions, Inc. Injection molding flow control apparatus
US6436320B1 (en) 1998-04-21 2002-08-20 Synventive Molding Solutions, Inc. Method using manifold system having flow control
US7901601B2 (en) 1998-04-21 2011-03-08 Synventive Molding Solutions, Inc. Injection molding flow control apparatus and method
US6585505B2 (en) 1998-04-21 2003-07-01 Synventive Molding Solutions, Inc. Machine for proportionally controlling fluid delivery to a mold
US6589039B1 (en) 1998-04-21 2003-07-08 Synventive Molding Solutions, Inc. Controlled injection using manifold having multiple feed channels
US6632079B1 (en) 1998-04-21 2003-10-14 Synventive Molding Solutions, Inc. Dynamic feed control system
US6343921B1 (en) 1998-04-21 2002-02-05 Synventive Molding Solutions Manifold system having flow control using separate cavities
US6254377B1 (en) 1998-04-21 2001-07-03 Synventive Molding Solutions, Inc. Manifold system having flow control using extended valve pin
US6767486B2 (en) 1998-04-21 2004-07-27 Synventive Molding Solutions, Inc. Controlled injection using manifold having multiple feed channels
US6769896B2 (en) 1998-04-21 2004-08-03 Synventive-Molding Solutions, Inc. Manifold system having flow control
US6824379B2 (en) 1998-04-21 2004-11-30 Synventive Molding Solutions, Inc. Apparatus for utilizing an actuator for flow control valve gates
US6343922B1 (en) 1998-04-21 2002-02-05 Synventive Molding Solutions Manifold system having flow control using pressure transducers
US6361300B1 (en) 1998-04-21 2002-03-26 Synventive Molding Solutions, Inc. Manifold system having flow control
US7234929B2 (en) 1999-09-21 2007-06-26 Synventive Molding Solutions, Inc. Injection molding flow control apparatus and method
US7419625B2 (en) 1999-09-21 2008-09-02 Synventive Molding Solutions, Inc. Injection molding flow control method
US7410354B2 (en) 2001-10-12 2008-08-12 Mold-Masters (2007) Limited Valve gated nozzle having a valve pin with a sensor
US7597828B2 (en) 2001-12-26 2009-10-06 Synventive Molding Solutions, Inc. Injection molding valve flow control
US7029268B2 (en) 2001-12-26 2006-04-18 Synventive Molding Solutions, Inc. Non-coaxial injection molding valve flow control
US7270537B2 (en) 2001-12-26 2007-09-18 Synventive Molding Solutions, Inc. Non-coaxial injection molding valve flow control
US6683283B2 (en) 2002-05-10 2004-01-27 Dynisco Hot Runners Inc. Canada Apparatus and method for heating injection molding fluid
US7182893B2 (en) 2002-10-11 2007-02-27 Mold-Masters Limited Valve gated nozzle having a valve pin with a sensor
WO2007140447A1 (fr) * 2006-05-31 2007-12-06 Graham Packaging Company, Lp Commande de la distribution de matériau polymère dans un processus de moulage par injection séquentielle
US7651644B2 (en) 2006-05-31 2010-01-26 Graham Packaging Company, Lp Controlling delivery of polymer material in a sequential injection molding process
US7892462B2 (en) 2006-05-31 2011-02-22 Graham Packaging Company, Llp Controlling delivery of polymer material in a sequential injection molding process
US8118581B2 (en) 2006-05-31 2012-02-21 Graham Packaging Company, Lp Injection molding apparatus for delivering multiple shots of materials to a plurality of mold cavities
US7527490B2 (en) 2006-10-13 2009-05-05 Mold-Masters (2007) Limited Coinjection molding apparatus and related hot-runner nozzle
US7713046B2 (en) 2006-10-13 2010-05-11 Mold-Masters (2007) Limited Injection molding apparatus having movable yoke plate

Also Published As

Publication number Publication date
EP1077799A1 (fr) 2001-02-28
CA2331576A1 (fr) 1999-11-25
JP2002515362A (ja) 2002-05-28

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