EP2040903A2 - System und verfahren zum unterscheiden eines fehlerhaften betriebszustands in einer heisskanalvorrichtung für einrichtungen zum spritzgiessen von kunststoffmaterial - Google Patents

System und verfahren zum unterscheiden eines fehlerhaften betriebszustands in einer heisskanalvorrichtung für einrichtungen zum spritzgiessen von kunststoffmaterial

Info

Publication number
EP2040903A2
EP2040903A2 EP07766549A EP07766549A EP2040903A2 EP 2040903 A2 EP2040903 A2 EP 2040903A2 EP 07766549 A EP07766549 A EP 07766549A EP 07766549 A EP07766549 A EP 07766549A EP 2040903 A2 EP2040903 A2 EP 2040903A2
Authority
EP
European Patent Office
Prior art keywords
temperature
hot
temperature variation
runner device
δti
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.)
Withdrawn
Application number
EP07766549A
Other languages
English (en)
French (fr)
Inventor
Peter Dal Bo
Dario Girelli
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.)
Inglass SpA
Original Assignee
Inglass SpA
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 Inglass SpA filed Critical Inglass SpA
Publication of EP2040903A2 publication Critical patent/EP2040903A2/de
Withdrawn legal-status Critical Current

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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/768—Detecting defective moulding conditions
    • 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
    • B29C45/2737—Heating or cooling means therefor
    • B29C45/2738—Heating or cooling means therefor specially adapted for manifolds
    • 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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/78—Measuring, controlling or regulating of temperature
    • 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
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/274—Thermocouples or heat sensors
    • B29C2045/2741—Plurality of independent thermocouples or heat sensors
    • 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
    • B29C45/2737—Heating or cooling means therefor
    • B29C2045/2754—Plurality of independent heating or cooling means, e.g. independently controlling the heating of several zones of the 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/7604—Temperature
    • B29C2945/76043—Temperature derivative, change 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76003—Measured parameter
    • B29C2945/76163—Errors, malfunctioning
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/76254—Mould
    • B29C2945/76274—Mould runners, nozzles
    • B29C2945/76277—Mould runners, nozzles nozzles
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76177—Location of measurement
    • B29C2945/76254—Mould
    • B29C2945/76274—Mould runners, nozzles
    • B29C2945/7628—Mould runners, nozzles manifolds
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76451—Measurement means
    • B29C2945/76454—Electrical, e.g. thermocouples
    • 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
    • B29C2945/00—Indexing scheme relating to injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould
    • B29C2945/76—Measuring, controlling or regulating
    • B29C2945/76929—Controlling method
    • B29C2945/76939—Using stored or historical data sets
    • B29C2945/76943—Using stored or historical data sets compare with thresholds

Definitions

  • the present invention relates to a system and to a method for discriminating a faulty operational condition in a hot-runner device for plastic materials injection-moulding equipments.
  • the present invention relates to a system and to a method that enable detection of a faulty operational condition of a thermocouple installed in a heating unit of a hot-runner device for plastic material injection-moulding equipments, wherein the heating unit is provided with a pair of heating resistors, operatively connected to two respective thermocouples; to which the following treatment will make explicit reference, without implying any loss of generality.
  • a hot-runner device which is set in a seat made in an injection mould and comprises a series of tubular branches that selectively convey a plastic material in a fluid state to injectors that inject it into an impression made within the mould; and a series of heating units, which are installed in the tubular branches, typically in a position corresponding to the injectors, for heating upon command the plastic material to be injected.
  • some latest-generation heating units are each provided with a pair of heating resistors separated and independent from one another, and with a pair of thermocouples, each of which is set in the tubular branch in a position corresponding to a respective resistor for measuring the temperature thereof.
  • the Italian patent application No. TO2001A000399 filed on April 27, 2001 in the name of A. S. Attrezzature Speciali S.r.l. describes an injector of a hot-runner device provided with a heating unit having a structure of the type described above, in which the two thermocouples of the two resistors are connected to a control unit for controlling the hot-runner device, which selectively activates one or the other of the two resistors of the heating unit according to their effective functionality.
  • thermocouples In systems for controlling hot-runner devices of the type described above, exists the problem of being able to distinguish in real time a faulty condition of measurement of the temperature deriving from a state of malfunction of one of the thermocouples, such as, for example a circuit interruption or a plastic deformation due to squeezing thereof, from a faulty condition of measurement deriving from an external event, i.e. from a cause that does not derive from a failure of the thermocouple.
  • the latter condition arises when a defectiveness of the hot-runner device determines a spillage of plastic material at high temperature, accidental deposit of which on the thermocouple/thermocouples causes a sudden increase in the temperature measured, which is not interpretable by the control unit.
  • the aim of the present invention is consequently to provide a control system that will be able to discriminate immediately a faulty condition deriving from a failure of the thermocouple, from a faulty condition deriving from an "external event", i.e., from a cause that cannot be put down to a failure of the thermocouple itself, but deriving, for example, from a leakage of material from the hot-runner device or from a coolant leakage or from some other cause.
  • a system and a method are provided for discriminating a faulty operational condition of a hot-runner device, as described in the appended claims.
  • Figure 1 is a schematic illustration of a system for discriminating a faulty operational condition in a hot-runner device for plastic material injection-moulding equipments, according to the present invention.
  • FIGS. 2a and 2b show a flowchart of the operations implemented by the system of Figure 1.
  • number 1 generally designates a system designed to discriminate a faulty condition deriving from malfunctioning of a temperature sensor installed in a hot-runner device from a faulty operational condition of the hot-runner device deriving from other causes and generic external events, such as, for example leakages of hot plastic material between the hot-runner device and the corresponding mould and/or a leakage of coolant of the mould itself.
  • the system 1 comprises an injection-moulding equipment 20 for plastic material injection-moulding, comprising, in turn, a hot-runner device 2 that is able to selectively convey and inject the plastic material in the liquid state into a series of injection points inside an injection mould 4 (represented schematically with a dashed line) for making a product of pre-set form; and a control unit 3 for controlling operation of the hot-runner device 2 that comprises at least one memory 3a, and a processing unit 3b connected, through known circuit modules (not illustrated) , to the different electrical components comprised in the hot- runner device 2 and described in detail in what follows.
  • an injection-moulding equipment 20 for plastic material injection-moulding comprising, in turn, a hot-runner device 2 that is able to selectively convey and inject the plastic material in the liquid state into a series of injection points inside an injection mould 4 (represented schematically with a dashed line) for making a product of pre-set form; and a control unit 3 for controlling operation of the hot-runner
  • the hot-runner device 2 is designed to be housed in a purposely provided seat 4a made in the body of the injection mould 4 and comprises, in turn, one or more injectors 6, each arranged in a corresponding point of injection provided in the injection mould 4, and one or more tubular branches 7 (two of which are illustrated schematically in Figure 1) , which convey the liquid plastic material from an input (not illustrated) to the injectors 6.
  • the hot-runner device 2 moreover comprises one or more heating units 8, each of which is set in a tubular branch 7 or in a position corresponding to an injector 6, and comprises one first and one second resistor designated in what follows, respectively, by 9 and 10, which are activated selectively by the control unit 3 for transmitting an amount of heat to the plastic material to be injected so as to maintain it in the liquid state at a pre-set injection temperature.
  • the first and second resistors are housed within a purposely provided seat (not illustrated) , made in the tubular branch and/or in the injector.
  • control unit 3 receives at input, at pre-set regular intervals ti, the temperatures Ti and T 2 , measured by the first thermocouple 11 and, respectively, by the second thermocouple 12 (blocks 100 and 110) .
  • the control unit 3 calculates the temperature variations ⁇ Ti and ⁇ T2 measured by the thermocouples 11 and 12, the first of which ⁇ Ti corresponds to the difference between the temperature Ti detected at the current instant of measurement ti and the temperature Ti detected at the immediately preceding instant of measurement ti-i (block 120) ; whereas the second temperature variation ⁇ T 2 corresponds to the difference between the temperature T 2 measured at the current instant ti and the temperature T 2 measured at the preceding instant ti-i (block 120) ; whereas the second temperature variation ⁇ T 2 corresponds to the difference between the temperature T 2 measured at the current instant ti and the temperature T 2 measured at the preceding instant ti-i (block 120) ; whereas the second temperature variation ⁇ T 2 corresponds to the difference between the temperature T 2 measured at the current instant ti and the temperature T 2 measured at the preceding instant ti-i (block 120) ; whereas the second temperature variation ⁇ T 2 corresponds to the difference between the temperature T 2 measured at the current instant
  • a pre-set maximum threshold S M for example of approximately 450 0 C (block 140) .
  • the control unit 3 identifies a generic condition of failure of the first thermocouple 11 and signals it (block 150); if not, i.e., if the temperature T 1 is smaller or equal to the maximum threshold S M (output NO from block 140) the control unit 3 verifies whether the following first relation is satisfied:
  • thermocouple 3 detects and signals a failure deriving from a circuit interruption of the first thermocouple
  • control unit 3 verifies whether the following second relation is satisfied or not:
  • S5 is a third comparison threshold, fixed for example at approximately 0,5 0 C (block 200) .
  • control unit 3 detects a failure deriving from a plastic deformation of the first thermocouple 11 (block
  • control unit 3 verifies whether a relation is satisfied or not, correlated to a faulty condition caused by a leakage of material from the hot-runner device 2
  • control unit 3 implements similar controls and comparisons by processing the temperature variation ⁇ T 2 .
  • control unit 3 verifies whether the temperature T 2 is higher than the maximum threshold SM (block
  • thermocouple 12 (block 240) and, if so, signals a generic failure of the second thermocouple 12 (block 240) ; if not (output NO from block 230) the control unit 3 verifies whether the following fourth relation is satisfied:
  • control unit 3 identifies and signals a faulty condition of operation deriving from an event not associated to malfunctioning of the thermocouples when, in the course of the moulding operations, the temperature measured is substantially constant, but there occur oscillations or perturbations of the electric power absorbed by the hot-runner device 2, this latter condition being correlated to the presence of leakages of hot plastic material and to the exit of liquid for cooling the mould.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP07766549A 2006-06-16 2007-06-15 System und verfahren zum unterscheiden eines fehlerhaften betriebszustands in einer heisskanalvorrichtung für einrichtungen zum spritzgiessen von kunststoffmaterial Withdrawn EP2040903A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTV20060108 ITTV20060108A1 (it) 2006-06-16 2006-06-16 Sistema e metodo per discriminare una condizione anomala di funzionamento in un dispositivo a canale caldo per apparecchiature di stampaggio ad iniezione di materiale plastico
PCT/IB2007/001599 WO2007144755A2 (en) 2006-06-16 2007-06-15 System and method for discriminating a faulty operational condition in a hot-runner device for plastic material injection-moulding equipments

Publications (1)

Publication Number Publication Date
EP2040903A2 true EP2040903A2 (de) 2009-04-01

Family

ID=38668690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07766549A Withdrawn EP2040903A2 (de) 2006-06-16 2007-06-15 System und verfahren zum unterscheiden eines fehlerhaften betriebszustands in einer heisskanalvorrichtung für einrichtungen zum spritzgiessen von kunststoffmaterial

Country Status (3)

Country Link
EP (1) EP2040903A2 (de)
IT (1) ITTV20060108A1 (de)
WO (1) WO2007144755A2 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2835030B2 (ja) * 1995-08-10 1998-12-14 株式会社名機製作所 射出成形機のノズル温度制御装置
US6529796B1 (en) * 1999-07-21 2003-03-04 Caco Pacific Corporation Closed loop interactive controller
ITTO20010399A1 (it) * 2001-04-27 2002-10-27 Attrezzature Speciali Srl As Ugello per stampi di iniezione di materie plastiche.
US7510895B2 (en) * 2004-10-29 2009-03-31 Nordson Corporation Inferential temperature control system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007144755A3 *

Also Published As

Publication number Publication date
WO2007144755A2 (en) 2007-12-21
ITTV20060108A1 (it) 2007-12-17
WO2007144755A3 (en) 2008-03-13

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