WO1991007271A1 - Control device on a plastic injection blow-moulding device - Google Patents

Control device on a plastic injection blow-moulding device Download PDF

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Publication number
WO1991007271A1
WO1991007271A1 PCT/EP1990/001860 EP9001860W WO9107271A1 WO 1991007271 A1 WO1991007271 A1 WO 1991007271A1 EP 9001860 W EP9001860 W EP 9001860W WO 9107271 A1 WO9107271 A1 WO 9107271A1
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WO
WIPO (PCT)
Prior art keywords
pressure
transmitter
blow
receiver
holloware
Prior art date
Application number
PCT/EP1990/001860
Other languages
German (de)
French (fr)
Inventor
Wolfgang FÖRSTER
Original Assignee
Foerster Wolfgang
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 Foerster Wolfgang filed Critical Foerster Wolfgang
Publication of WO1991007271A1 publication Critical patent/WO1991007271A1/en

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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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/80—Testing, e.g. for leaks

Definitions

  • the control device according to the invention is intended to provide a simple means of achieving a better quality of the hollow plastic body produced, without this requiring a large outlay on equipment.
  • a pressure measuring device attached to and connected to the blower core, a transmitter connected and interacting with the pressure measuring device and a receiver spatially arranged separately from the blower core, which transmit the measured pressure from the transmitter receives corresponding signals, evaluates and operates a transport switch for the hollow bodies produced depending on the determined pressure value.
  • the pressure in the manufacture of hollow bodies made of plastic is continuously measured and the measured value is transmitted wirelessly from the rotating part-sender- to a stationary part-receiver.
  • the signal for the early completion of the stretching process is included.
  • the received signals are sent to the evaluation electronics by cable.
  • the pressure signal is shown as a numerical value per blowing station and as a bar chart for several stations.
  • the pressure values sent are assigned to the station number.
  • the target pressure values and station numbers are adjustable.
  • the voltage coming from the pressure transducer is converted into an 8-bit word by the analog-digital converter and then into a serial signal by the parallel-serial converter, this signal is amplified and fed to the infrared transmitter diode.
  • the transmitted signal does not only consist of the pressure value, but also a total of five data words:
  • the transmitter is able to continuously transmit the five data words, but because of energy savings and Data transmission security, data transmission is triggered only by a signal from the evaluation electronics.
  • This start signal is an IR pulse from the receiver electronics to the transmitter. Data transmission is only triggered when this pulse is received by the transmitter.
  • a receiver can be positioned anywhere outside the wheel and the pressure curve, which characterizes the blowing process and influences the quality, can be recorded.
  • the distance between transmitter and receiver is 150-300mm.
  • the sequential number of the blowing station is set on two BCD switches (inside the transmitter).
  • the transmitter electronics and the pressure sensor are housed in a metal housing.
  • the receiver consists of: A plastic housing, a circuit board with an IR transmitter (for transmission start signal) and an IR receiver and a multi-pin socket for the connection cable to the evaluation electronics.
  • the receiver is placed outside the moving part at the same height as the transmitter.
  • the position of the receiver is just before the cut-off point of the blowing air.
  • the evaluation electronics are located outside the blow molding machine and are connected to the receiver via a flexible, multi-pole cable.
  • the device works with a microprocessor, which converts the signals coming from the receiver, compares them with specified target values and displays them on a graphic display.
  • the limit values can be set numerically on the inside of the housing using BCD switches, division 0. 5 bar.
  • Undershoots of limit values can be signaled acoustically or optically by connecting alarm transmitters to potential-free contacts. Prevents z. B. a defect the
  • Recharging the battery this can also be signaled by an external warning signal generator.
  • the values from several stations are displayed individually.
  • the display also serves to align the transmitter and receiver. All pressure values, provided with a station number, can be displayed. These values are kept until the next round.
  • 10 and 11 show the two parts of a two-part blow mold, which is usually located on a carousel or the like.
  • a hollow body which is supplied with pressure medium by means of a blow core 12 via a feed line 13, as can be seen from the arrow indicated above.
  • the pressure introduced into the blow mold is controlled, but not measured, especially not after the hollow body has assumed its final shape and can be removed from the blow mold after a more or less long cooling time. Due to the pressure immediately after the complete expansion of the hollow body, a reliable statement can be made as to whether the hollow body has the appropriate shape and also the desired quality and tightness.
  • a valve part 14 is provided in the pressure medium supply line, which shuts off the pressure medium supplied after the blowing process and opens an opening to a measuring device, which is also located in the part designated by 14.
  • the determined pressure value 14 is forwarded to a transmitter 15.
  • the pressure value transmitted by the transmitter 15 arrives at the receiver 16, which carries out the corresponding evaluation and actuates a switch 17 so that perfect hollow bodies, which arrive from the blow mold 10, 11 in the direction of the arrow 18, are continued on the path of the arrow 19, while defective hollow bodies take another path, that of arrow 20, and are sorted out from the production process.
  • 29 bar was determined as the minimum pressure for a correct volume.
  • a 33 bar supply pressure is available on the machine.
  • the decision point for hollow bodies "good” or “bad” is 29 bar.
  • the machine system “consumes” 2 bar (theoretical value).
  • the static pressure in the hollow body only reaches 25 bar due to leakages in the system.
  • This hollow body is lower because contours are not formed, a shorter cooling time and, as a result, greater shrinkback occur.
  • These hollow bodies lying outside the standard are recognized by the measuring system and automatically ejected before the hollow body enters the further production process.

Abstract

The invention relates to a control device on an injection blow-moulding device for producing plastic holloware, especially bottles, whereby a pressure agent, a blowing core and a blow-mould are used to make holloware from pre-mouldings which are then taken to a further stage on a production line. In addition there are a pressure measuring device (14) fitted to the blowing core (12) and connected thereto, a transmitter (15) connected to and working with the pressure measuring device (14) and a receiver (16) arranged separately from the blowing core which receives the signals from the transmitter (15) corresponding to the measured pressure, assesses them and actuates a conveyor switch (17) for the holloware produced depending on the pressure found.

Description

Steuervorrichtung an einer Kunststoffspritzblaseinrichtung Control device on a plastic injection blow device
Im Betrieb derartiger Spritzblaseinrichtungen kann niemals sichergestellt werden, daß nicht doch ein Hohlkörper gebildet wird, der Fehler auf eist. Es könnte sich hierbei um Dimensionsfehler handeln, es könnte sich aber auch im krassesten Fall darum handeln, daß der Hohlkörper nicht dicht ist und ein mehr oder weniger großes Loch hat, was beispielsweise durch das eindringende Druckmittel beim Blasvorgang erzeugt worden sein könnte. Es kommt noch hinzu, daß derartige Blaseinrichtungen mit beweglichen Blasformen arbeiten, so daß die Überprüfung der Druckverhältnisse beim Blasvorgang erhebliche Schwierigkeiten mit sich bringt.In the operation of such injection blow molding devices, it can never be ensured that a hollow body is not formed which is prone to defects. It could be a matter of dimensional errors, but it could also be, in the most extreme case, that the hollow body is not tight and has a more or less large hole, which could have been generated, for example, by the penetrating pressure medium during the blowing process. There is also the fact that such blowing devices work with movable blow molds, so that checking the pressure conditions during the blowing process presents considerable difficulties.
Durch die Steuervorrichtung gemäß der Erfindung soll ein einfaches Mittel geschaffen werden, um eine bessere Qualität der hergestellten Kunststoffhohlkörper zu erreichen, ohne daß hierdurch ein großer apparativer Aufwand erforderlich wird.The control device according to the invention is intended to provide a simple means of achieving a better quality of the hollow plastic body produced, without this requiring a large outlay on equipment.
Erreicht wird dies durch die im Schutzanspruch angegebenen Merkmale, nämlich dadurch, daß ein am Blaskern angebrachtes und mit diesem verbundenes Druckmeßgerät, einen mit dem Druckmeßgerät verbundenen und zusammenwirkenden Sender und einem räumlich vom Blaskern getrennt angeordneten Empfänger, der die vom Sender ausgesendeten, dem gemessenen Druck entsprechenden Signale empfängt, auswertet und eine Transportweiche für die hergestellten Hohlkörper je nach ermitteltem Druckwert betätigt. Nach der Erfindung wird der Druck bei der Herstellung von Hohlkörpern aus Kunststoff ständig gemessen und der Meßwert von dem rotierendem Teil -Sender-, zu einem stationärem Teil - Empfänger, drahtlos übertragen werden.This is achieved by the features specified in the protection claim, namely in that a pressure measuring device attached to and connected to the blower core, a transmitter connected and interacting with the pressure measuring device and a receiver spatially arranged separately from the blower core, which transmit the measured pressure from the transmitter receives corresponding signals, evaluates and operates a transport switch for the hollow bodies produced depending on the determined pressure value. According to the invention, the pressure in the manufacture of hollow bodies made of plastic is continuously measured and the measured value is transmitted wirelessly from the rotating part-sender- to a stationary part-receiver.
Das Signal für den vorzeitigen Abschluß des Reckvorganges wird mit einbezogen. Die empfangenen Signale werden per Kabel zur Auswertelektronik geleitet. Das Drucksignal wird als Zahlenwert pro Blasstation sowie als Balkendiagramm für mehrere Stationen dargestellt.The signal for the early completion of the stretching process is included. The received signals are sent to the evaluation electronics by cable. The pressure signal is shown as a numerical value per blowing station and as a bar chart for several stations.
Da sich mehrere Blasstationen auf einem rotierenden Teil befinden, erfolgt eine Zuordnung der gesendeten Druck-Werte zur Stations-Nummer. Die Solldruckwerte und Stationsnummern sind einstellbar.Since there are several blowing stations on a rotating part, the pressure values sent are assigned to the station number. The target pressure values and station numbers are adjustable.
Die vom Druck-Aufnehmer kommende Spannung wird durch den Analog- Digital Wandler in ein 8-Bit-Wort, und dann durch den Parallel- Seriell-Wandler in ein serielles Signal umgewandelt, dieses Signal wird verstärkt und der Infrarot-Sendediode zugeführt . Das übertragene Signal besteht jedoch nicht nur aus dem Druckwert, sondern aus insgesamt fünf Daten-Worten:The voltage coming from the pressure transducer is converted into an 8-bit word by the analog-digital converter and then into a serial signal by the parallel-serial converter, this signal is amplified and fed to the infrared transmitter diode. However, the transmitted signal does not only consist of the pressure value, but also a total of five data words:
Wort 1 Synchron-Signal > Start -der Übertragung Wort 2 Nummer der Blas-Station > Zur Zuordnung Wort 3 Druck-Wert > Zum Sollwertvergleich Wort 4 Reckgrad > Endlage (in Vorberei¬ tung)Word 1 synchronous signal> start of transmission Word 2 number of blowing station> for assignment Word 3 pressure value> for comparison of setpoint word 4 stretching degree> end position (in preparation)
Wort 5: Istspannung des Akkus > Ladezustands-Über¬ wachungWord 5: Actual voltage of the battery> state of charge monitoring
Der Sender ist in der Lage, ständig die fünf Daten-Worte zu übertragen, jedoch wegen Stromersparnis und Datenübertragungssicherheit , wird nur auf ein Signal hin, von der Auswertelektronik, eine Datenübertragung ausgelöst .The transmitter is able to continuously transmit the five data words, but because of energy savings and Data transmission security, data transmission is triggered only by a signal from the evaluation electronics.
Diese s Start s ignal ist ein IR- Impuls von der Empfänger- Elektronik zum Sender . Erst der Empfang dieses Impulses , vom Sender, löst die Datenübertragung aus .This start signal is an IR pulse from the receiver electronics to the transmitter. Data transmission is only triggered when this pulse is received by the transmitter.
Da der Druck ständig gemessen wird, kann an jeder beliebigen Stelle außerhalb des Rades ein Empfänger positioniert werden und somit die Druckkurve , die den Blasprozess kennzeichnet und die Qualität beeinflußt, erfaßt werden .Since the pressure is constantly measured, a receiver can be positioned anywhere outside the wheel and the pressure curve, which characterizes the blowing process and influences the quality, can be recorded.
Es muß sichergestellt werden, daß sich Sender und Empfänger für diese Zeit spanne wirklich auch "sehen" . Der Abstand zwischen Sender und Empfänger beträgt 150 - 300mm- .It must be ensured that the sender and receiver really "see" each other for this period of time. The distance between transmitter and receiver is 150-300mm.
Die laufende Nummer der Blasstation wird an zwei BCD-Schaltern ( im Innern des Senders ) eingestellt . Die Sende-Elektronik ist mit dem Druckaufnehmer in einem Metall-Gehäuse untergebracht .The sequential number of the blowing station is set on two BCD switches (inside the transmitter). The transmitter electronics and the pressure sensor are housed in a metal housing.
Der Empfänger besteht aus : Einem Kunststoff-Gehäuse , einer Platine mit IR-Sender ( für Übertragungsstartsignal) und IR- Empfänger und einer mehrpoligen Buchse für das Verbindungskabel zur Auswerte-Elektronik .The receiver consists of: A plastic housing, a circuit board with an IR transmitter (for transmission start signal) and an IR receiver and a multi-pin socket for the connection cable to the evaluation electronics.
Der Empfänger wird außerhalb des beweglichen Teiles in gleicher Höhe wie die Sender angeordnet .The receiver is placed outside the moving part at the same height as the transmitter.
Die Position des Empfängers ist kurz vor dem Abschaltpunkt der Blas luft . Hier kann über den im Hohlkörper anstehenden Systemdruck die Aussage gemacht werden , ob der produz ierte Hohlkörper den Spezifikationen entspricht oder ob er einer weiteren Verarbeitung entzogen werden muß . Die Auswerte-Elektronik befindet sich außerhalb der Blasform- Mas chine und ist mit dem Empfänger über ein flexibles mehrpoliges Kabel verbunden .The position of the receiver is just before the cut-off point of the blowing air. Here you can use the system pressure in the hollow body to make a statement as to whether the hollow body produced complies with the specifications or whether it has to be removed from further processing. The evaluation electronics are located outside the blow molding machine and are connected to the receiver via a flexible, multi-pole cable.
Das Gerät arbeitet mit einem Mikroprozessor, der die vom Empfänger kommenden S ignale umrechnet , mit vorgegebenen Sollwerten vergleicht und sie auf einem Grafik-Display zur Anzeige bringt . Die Grenzwerte lassen sich im Innern des Gehäuses an BCD-Schaltern numerisch einstellen, Teilung 0 . 5 bar .The device works with a microprocessor, which converts the signals coming from the receiver, compares them with specified target values and displays them on a graphic display. The limit values can be set numerically on the inside of the housing using BCD switches, division 0. 5 bar.
ünterschreitungen von Grenzwerten können durch Anschluß von Alarmgebern an potentialfreie Kontakte akustisch oder optisch signali s iert werden . Verhindert z . B . ein Defekt dieUndershoots of limit values can be signaled acoustically or optically by connecting alarm transmitters to potential-free contacts. Prevents z. B. a defect the
Wiederaufladung des Akkus , kann dies ebenfalls durch einen externen Warnsignalgeber signalisiert werden .Recharging the battery, this can also be signaled by an external warning signal generator.
Darstellung auf dem Display :Representation on the display:
a) Sollwert als Zahlenwert b) Istwert als Länge eines Balkens, quasi-analόge Anzeige (Speicherausgabe, bis neuer Wert eingegangen ist.)a) Setpoint as a numerical value b) Actual value as the length of a bar, quasi-analog display (memory output until new value is received.)
Unter b) werden die Werte von mehreren Stationen einzeln zur Anzeige gebracht . Das Display dient ebenfalls zur Ausrichtung von Sender und Empfänger. Es können alle Druckwerte, versehen mit Stationsnummer, dargestellt werden. Diese Werte werden bis zum nächsten Umlauf festgehalten.Under b) the values from several stations are displayed individually. The display also serves to align the transmitter and receiver. All pressure values, provided with a station number, can be displayed. These values are kept until the next round.
Die Erfindung wird nachstehend anhand der Zeichnung beispielsweise erläutert. Diese zeigt eine schaubildliche Ansicht einer Vorrichtung gemäß der Erfindung.The invention is explained below with reference to the drawing, for example. This shows a perspective view of a device according to the invention.
In der Figur sind mit 10 und 11 die beiden Teile einer zweiteiligen Blasform gezeigt, die sich für gewöhnlich auf einem Karussel oder dergleichen befindet. Im Innern der Blasform befindet sich ein Hohlkörper, der mit Hilfe eines Blaskerns 12 über eine Zuleitung 13 mit Druckmittel versorgt wird, wie dies durch den oben angegebenen Pfeil zu erkennen ist. Normalerweise wird der in die Blasform eingeleitete Druck zwar gesteuert, jedoch nicht gemessen, insbesondere nicht nachdem der Hohlkörper seine endgültige Gestalt eingenommen hat und nach mehr oder weniger langer Abkühlzeit der Blasform entnommen werden kann. Aufgrund des unmittelbar nach dem vollständigen Aufweiten des Hohlkörpers herrschenden Druckes kann aber eine sichere Aussage getroffen werden, ob der Hohlkörper die geeignete Gestalt und darüber hinaus auch die gewünschte Qualität und Dichtigkeit hat.In the figure, 10 and 11 show the two parts of a two-part blow mold, which is usually located on a carousel or the like. Inside the blow mold there is a hollow body which is supplied with pressure medium by means of a blow core 12 via a feed line 13, as can be seen from the arrow indicated above. Normally, the pressure introduced into the blow mold is controlled, but not measured, especially not after the hollow body has assumed its final shape and can be removed from the blow mold after a more or less long cooling time. Due to the pressure immediately after the complete expansion of the hollow body, a reliable statement can be made as to whether the hollow body has the appropriate shape and also the desired quality and tightness.
Gemäß der Erfindung ist in der Druckmittelzuleitung ein Ventilteil 14 vorgesehen, das das zugeführte Druckmittel nach dem Blasvorgang absperrt und eine Öffnung zu einem Meßgerät freigibt, das sich ebenfalls in dem mit 14 bezeichneten Teil befindet. Der ermittelte Druckwert 14 wird an einen Sender 15 weitergeleitet.According to the invention, a valve part 14 is provided in the pressure medium supply line, which shuts off the pressure medium supplied after the blowing process and opens an opening to a measuring device, which is also located in the part designated by 14. The determined pressure value 14 is forwarded to a transmitter 15.
Der vom Sender 15 übertragene Druckwert gelangt zu dem Empfänger 16, der die entsprechende Auswertung vornimmt und eine Weiche 17 betätigt, damit einwandfreie Hohlkörper, die von der Blasform 10, 11 in Richtung des Pfeiles 18 ankommen, auf dem Weg des Pfeiles 19 weitergeführt werden, während fehlerhafte Hohlkörper einen anderen Weg, den des Pfeiles 20 nehmen und aus dem Fertigungsvorgang aussortiert werden.The pressure value transmitted by the transmitter 15 arrives at the receiver 16, which carries out the corresponding evaluation and actuates a switch 17 so that perfect hollow bodies, which arrive from the blow mold 10, 11 in the direction of the arrow 18, are continued on the path of the arrow 19, while defective hollow bodies take another path, that of arrow 20, and are sorted out from the production process.
Für einen selbststehenden Hohlkörper wurden im Versuch 29 bar als Mindestdruck für ein korrektes Volumen ermittelt.For a self-standing hollow body, 29 bar was determined as the minimum pressure for a correct volume.
An der Maschine stehen 33 bar Versorgungsdruck zur Verfügung. Der Entscheidungspunkt für Hohlkörper "gut" oder "schlecht" liegt bei 29 bar. Das Maschinensystem "verbraucht" 2 bar (Theoretischer Wert) . Der absolute Mindestdruck für einen noch brauchbaren Hohlkörper darf 28 bar nicht unterschreiten. = Einzustellender Sollwert am Auswertegerät. Der statische Druck im Hohlkörper erreicht aufgrund von Leckagen im System nur 25 bar.A 33 bar supply pressure is available on the machine. The decision point for hollow bodies "good" or "bad" is 29 bar. The machine system "consumes" 2 bar (theoretical value). The absolute minimum pressure for a still usable hollow body must not fall below 28 bar. = Setpoint to be set on the evaluation device. The static pressure in the hollow body only reaches 25 bar due to leakages in the system.
Das Volumen dieses Hohlkörpers ist geringer, weil Konturen nicht ausgeformt sind, eine geringere Kühlzeit und dadurch bedingter größerer Rückschrumpf entstehen. Diese außerhalb der Norm liegenden Hohlkörper werden vom Meßsystem erkannt und automatisch ausgeworfen, bevor der Hohlkörper in den weiteren Produktionsprozeß gelangt. The volume of this hollow body is lower because contours are not formed, a shorter cooling time and, as a result, greater shrinkback occur. These hollow bodies lying outside the standard are recognized by the measuring system and automatically ejected before the hollow body enters the further production process.

Claims

PatentanspruchClaim
Steuervorrichtung an einer Spritz- Blaseinrichtung zur Herstellung von Kunststoffhohlkörpern, insbesondere Flaschen, wobei aus Vorformlingen mittels eines Druckmittels, eines Blaskerns und einer Blasform Hohlkörper hergestellt und einer weiteren Stufe einer Fertigungslinie zugeführt werden, gekennzeichnet durch ein am Blaskern (12) angebrachtes und mit diesem verbundenes Druckmeßgerät (14), einen mit dem Druckmeßgerät (14) verbundenen und zusammenwirkenden Sender (15) und einem räumlich vom Blaskern getrennt angeordneten Empfänger (16), der die vom Sender (15) ausgesendeten, dem gemessenen Druck entsprechenden Signale empfängt, auswertet und eine Transportweiche (17) für die hergestellten Hohlkörper je nach ermitteltem Druckwert betätigt. S expensive device to a spray Blaseinric h tung to H first ll un g of hollow plastic bodies, insbeson d e r e Flas c e n, where ei b from V orformlingen means of a printing center l s, a Bl as k Erns and a blow mold hollow body herges t e l t an d a r w ei te r s St UFE a production line supplied f ü h rt who en d, ge k ennzeichnet by the blow core (12) b rac h tes un d mi t di ESEM v erbundenes pressure gauge (14), a mi td e m Dr uc k me ßge advises (14) k s related and zusammenwir d e n s s he d (15) an d e i nem r äumlich from the blow core spaced-arrange t s e m pf ä ng he receives (16) the emitted by the transmitter (15), d em g em e ss e ne Dr uc k ents p computing signals auswer tet u n de in e Trans p ortweiche (17) for the manufactured Ho hl körpe rj e nac h determined pressure value actuated.
PCT/EP1990/001860 1989-11-11 1990-11-07 Control device on a plastic injection blow-moulding device WO1991007271A1 (en)

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DE8913346U DE8913346U1 (en) 1989-11-11 1989-11-11
DEG8913346.3U 1989-11-11

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EP0562202A2 (en) * 1991-12-27 1993-09-29 Kao Corporation Blow molding machine
DE102011016688A1 (en) * 2011-04-11 2012-10-11 Rehau Ag + Co. Method for detecting defects in blow molded parts
CN101623925B (en) * 2008-07-08 2014-03-12 克朗斯股份公司 Device to expand performs into plastic containers with temperature recording
CN112197167A (en) * 2020-10-09 2021-01-08 广东省特种设备检测研究院 Vehicle-mounted hydrogen storage bottle air tightness early warning monitoring system

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DE19933847A1 (en) * 1999-07-20 2001-01-25 Krupp Corpoplast Maschb Gmbh Blow molding of e.g. polyethyleneterephthalate bottles, employs bypass system transferring preforms directly from feed unit to molding extractor should malfunction prevent insertion into blowing mold
DE102004061230B4 (en) * 2004-12-16 2011-09-29 Krones Ag Blowing machine and blowing process
IT201700006070A1 (en) * 2017-01-20 2018-07-20 Verve Spa Improved machine for molding stretch-blow molding containers and verification method

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EP0562202A2 (en) * 1991-12-27 1993-09-29 Kao Corporation Blow molding machine
EP0562202A3 (en) * 1991-12-27 1994-02-09 Kao Corp
US5399302A (en) * 1991-12-27 1995-03-21 Kao Corpoation Parison length control method for blow molding machine
CN101623925B (en) * 2008-07-08 2014-03-12 克朗斯股份公司 Device to expand performs into plastic containers with temperature recording
DE102011016688A1 (en) * 2011-04-11 2012-10-11 Rehau Ag + Co. Method for detecting defects in blow molded parts
DE102011016688B4 (en) * 2011-04-11 2015-03-19 Rehau Ag + Co. Method for detecting defects in blow molded parts
CN112197167A (en) * 2020-10-09 2021-01-08 广东省特种设备检测研究院 Vehicle-mounted hydrogen storage bottle air tightness early warning monitoring system

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EP0453534A1 (en) 1991-10-30
DE8913346U1 (en) 1990-03-29
JPH04503638A (en) 1992-07-02

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