EP0577950A1 - Method for inspecting the volume of plastic bottles and device for carrying out this method - Google Patents

Method for inspecting the volume of plastic bottles and device for carrying out this method Download PDF

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Publication number
EP0577950A1
EP0577950A1 EP93107540A EP93107540A EP0577950A1 EP 0577950 A1 EP0577950 A1 EP 0577950A1 EP 93107540 A EP93107540 A EP 93107540A EP 93107540 A EP93107540 A EP 93107540A EP 0577950 A1 EP0577950 A1 EP 0577950A1
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EP
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Prior art keywords
bottle
determined
inspection machine
bottles
height
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EP93107540A
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German (de)
French (fr)
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EP0577950B1 (en
Inventor
Kurt Marinics
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Elpatronic AG
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Elpatronic AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/04—Sorting according to size
    • B07C5/12—Sorting according to size characterised by the application to particular articles, not otherwise provided for
    • B07C5/122—Sorting according to size characterised by the application to particular articles, not otherwise provided for for bottles, ampoules, jars and other glassware
    • B07C5/126—Sorting according to size characterised by the application to particular articles, not otherwise provided for for bottles, ampoules, jars and other glassware by means of photo-electric sensors, e.g. according to colour

Abstract

To determine the volume of a reusable PET bottle, its height is determined. Since the height and volume are correlated in a sufficiently accurate way, bottles which have become too small because of the shrinkage of such bottles during their lifetime can be determined in a simple and quick way. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren zur Inspektion einer Kunststoff-Mehrwegflasche, insbesondere einer PET-Flasche, bezüglich deren Volumens. Ferner betrifft die Erfindung eine Flascheninspektionsmaschine zur Durchführung des Verfahrens.The invention relates to a method for inspecting a reusable plastic bottle, in particular a PET bottle, with regard to its volume. The invention further relates to a bottle inspection machine for performing the method.

Es ist bekannt, Kunststoff-Mehrwegflaschen, welche insbesondere als Flaschen aus PET (Polyäthylenterephthalat) bekannt sind, bei jedem Rücklauf zu inspizieren. Die Flaschen werden dabei auf Unversehrtheit und Sauberkeit geprüft.It is known to inspect plastic reusable bottles, which are known in particular as bottles made of PET (polyethylene terephthalate), with each return. The bottles are checked for integrity and cleanliness.

Es wäre nun wünschenswert, die Inspektion um eine einfache volumenprüfung zu erweitern, da insbesondere die Flaschen aus PET nicht volumenstabil sind; es kann also durchaus vorkommen, dass eine PET-Flasche bereits vor Erreichen ihrer Mehrwegumlaufslebensdauer (ca. 25 Befüllungen) das geforderte Sollvolumen gar nicht mehr aufweist, was insbesondere Probleme beim Befüllen ergeben kann. Es stellt sich nun die Aufgabe, den gewünschten Inspektionsschritt auf einfache Weise mit genügender Genauigkeit und rasch durchzuführen. Die angestrebte Inspektionsleistung moderner Flascheninspektionsmaschinen beträgt ca. 600 Flaschen pro Minute und soll natürlich durch die Sollvolumenprüfung nicht herabgesetzt werden.It would now be desirable to extend the inspection by a simple volume check, since the bottles made of PET in particular are not stable in volume; So it is quite possible that a PET bottle will no longer have the required target volume before it has reached its reusable cycle life (approx. 25 fillings), which in particular can cause problems when filling. The task now is to carry out the desired inspection step in a simple manner with sufficient accuracy and quickly. The desired inspection performance of modern bottle inspection machines is approximately 600 bottles per minute and of course should not be reduced by the target volume check.

Die Aufgabe wird erfindungsgemäss dadurch gelöst, dass mindestens eine lineare Abmessung der Flasche ermittelt wird.The object is achieved according to the invention in that at least one linear dimension of the bottle is determined.

Es hat sich überraschenderweise gezeigt, dass bei Kunststoff-Flaschen und insbesondere PET-Flaschen durch die Ermittlung einer linearen Flaschenabmessung das Volumen der Flasche genügend genau bestimmbar ist. Die Ermittlung einer linearen Abmessung ist sehr einfach auch bei mit hoher Geschwindigkeit in einer Inspektionsmaschine geförderten Flaschen möglich.It has surprisingly been found that in the case of plastic bottles and in particular PET bottles, the volume of the bottle can be determined with sufficient accuracy by determining a linear bottle dimension. The determination of a linear dimension is very simple even at high speed in an inspection machine promoted bottles possible.

Bevorzugterweise wird die Höhe der Flasche ermittelt. Es hat sich bei PET-Flaschen herausgestellt, dass diese insbesondere in der Höhe abnehmen, wodurch sich hauptsächlich die Volumenreduktion ergibt. Das Höhenmass ist ferner insbesondere leicht ermittelbar, wie nachstehend noch erläutert wird.The height of the bottle is preferably determined. It has been found in PET bottles that they decrease in height in particular, which mainly results in a reduction in volume. The height dimension is also particularly easy to determine, as will be explained below.

Die erfindungsgemässe Flascheninspektionsmaschine ist mit einer Messanordnung für die lineare Abmessung ausgestattet.The bottle inspection machine according to the invention is equipped with a measuring arrangement for the linear dimension.

Im folgenden wird ein Ausführungsbeispiel anhand der Zeichnungen näher erläutert. Dabei zeigt die einzigeAn exemplary embodiment is explained in more detail below with reference to the drawings. The only one shows

Figur eine schematische Darstellung der Messanordnung für die Höhenmessung einer FlascheFigure is a schematic representation of the measuring arrangement for the height measurement of a bottle

In Figur 1 ist nur der Kopfbereich 2 einer PET-Flasche 1 dargestellt. Ein Sender 4 sendet einen bandförmigen Laserstrahl 5 aus, welcher in einem Empfänger 6 empfangen wird. Entsprechende Sende/Empfangsanordnungen mit zugehörigem Empfängerverstärker werden z.B. unter der Typenbezeichnung LX2 von der Firma Keyence, Osaka, Japan, hergestellt. Der Empfängerverstärker kann dabei z.B. die Ueberschreitung oder Unterschreitung eines bestimmten Grenzwertes der empfangenen Laserlichtmenge angeben, oder er gibt eine Analogspannung ab, die der empfangenen Lichtmenge proportional ist und welche Spannung weiterverarbeitet werden kann.In Figure 1, only the head area 2 of a PET bottle 1 is shown. A transmitter 4 emits a band-shaped laser beam 5, which is received in a receiver 6. Corresponding transmit / receive arrangements with associated receiver amplifiers are e.g. manufactured under the type designation LX2 by Keyence, Osaka, Japan. The receiver amplifier can e.g. indicate the exceeding or falling below a certain limit of the amount of laser light received, or it outputs an analog voltage that is proportional to the amount of light received and which voltage can be processed.

Die empfangene Lichtmenge ist in der gezeigten Anordnung abhängig von der Höhe der Flasche, da deren Oberkante 3 den bandförmigen Laserlichtstrahl von dessen Unterseite her blockiert. Je grösser die Höhe der Flasche ist, um so weiter ragt sie in das Lichtband hinein, bzw. um so geringer ist die empfangene Lichtmenge. Bei geringerer Höhe der Flasche ragt diese weniger weit in das Lichtband hinein und die empfangene Lichtmenge ist grösser. Die Flaschenhöhe lässt sich auf diese Weise mit einer Genauigkeit von ca. 0,1 mm ermitteln. Da Höhe und Volumen bei PET-Flaschen von vorgegebener Gestalt sehr genau korrelieren, also von der Höhe der Flasche mit guter Genauigkeit auf deren Volumen zurückgeschlossen werden kann, ergibt die geschilderte Höhenmessung eine einfache und rasche Möglichkeit der Volumeninspektion. Es ist dabei in der Regel nur notwendig, die Unterschreitung eines vorbestimmten unteren Grenzwertes für die Flaschenhöhe zu ermitteln (entsprechend einem oberen Grenzwert für die empfangene Lichtmenge), da in der Regel nur die Unterschreitung eines Sollvolumens bei der Inspektion von Interesse ist. Anstelle der Höhe der Flasche kann fallweise auch eine andere lineare Abmessung ermittelt werden, die bei dem zu prüfenden Flaschentyp genügend genau mit dem Volumen korreliert. Zum Beispiel kann die Höhe ab Boden des Kragens 3 ermittelt werden, oder es kann der Flaschendurchmesser ermittelt werden, wenn diese bei einem bestimmten Flaschentyp als Mass für die Volumenänderung geeignet ist.The amount of light received in the arrangement shown depends on the height of the bottle, since its upper edge 3 blocks the band-shaped laser light beam from its underside. The greater the height of the bottle, the further it protrudes into the light band, or the smaller the amount of light received. If the bottle is lower, it projects less into the light band and the amount of light received is greater. The bottle height can be determined in this way with an accuracy of approx. 0.1 mm. Because height and Correlating the volume of PET bottles of a given shape very precisely, that is, from the height of the bottle, the volume of which can be inferred with good accuracy, the described height measurement provides a simple and rapid possibility of volume inspection. As a rule, it is only necessary to determine whether the bottle height falls below a predetermined lower limit (corresponding to an upper limit for the amount of light received), since it is usually only of interest that the inspection falls below a target volume. Instead of the height of the bottle, another linear dimension can also be determined on a case-by-case basis, which correlates with the bottle type to be tested with sufficient accuracy. For example, the height from the bottom of the collar 3 can be determined, or the bottle diameter can be determined if this is suitable as a measure of the volume change for a specific bottle type.

Bei der vorstehend geschilderten Höhenmessung ist davon ausgegangen worden, dass die Flasche auf einem Boden steht bzw. mit diesem gefördert wird, dessen Abstand zur Messanordnung 4,5,6 bekannt und fix ist. Dies ist bei einer Fördereinrichtung in einer Inspektionsmaschine, z.B. einer Karusselfördereinrichtung oder einem Förderband in der Regel angenommen. Falls die Messung erfolgt während die Lage der Flasche nicht derart genau definiert ist, so können z.B. zwei Messanordnungen vorgesehen werden, wobei die eine Messanordnung die Oberkante der Flasche erfasst, wie in Figur 1 gezeigt, und die andere Messanordnung die Unterkante der Flasche erfasst. Aus den beiden Lichtmengen bzw. Ausgangssignalen der Messanordnungen ist dann die Höhe der Flasche bzw. die Einhaltung von deren Sollvolumen ermittelbar.In the case of the height measurement described above, it was assumed that the bottle stands on a floor or is conveyed with it, the distance to the measuring arrangement 4, 5, 6 of which is known and fixed. This is with a conveyor in an inspection machine, e.g. a carousel conveyor or a conveyor belt usually accepted. If the measurement is made while the position of the bottle is not so precisely defined, e.g. two measuring arrangements are provided, one measuring arrangement measuring the upper edge of the bottle, as shown in FIG. 1, and the other measuring arrangement measuring the lower edge of the bottle. The height of the bottle or compliance with its target volume can then be determined from the two light quantities or output signals of the measuring arrangements.

Vorzugsweise erfolgt die geschilderte Ermittlung der linearen Flaschenabmessung in einer Inspektionsmaschine. Die Messanordnung lässt sich dabei auf vielfältige Weise entlang des Förderweges anordnen. Es können auch mehrere Messanordnungen vorgesehen sein, zur unabhängigen Prüfung mehrerer Flaschen. Sofern bei einer Inspektionsmaschine bereits eine Höhenmessung der Flasche aus anderem Grund als der Volumenermittlung mit genügender Genauigkeit vorgesehen sein sollte, so kann erfindungsgemäss deren Messresultat zur Volumeninspektion verwendet werden.The described determination of the linear bottle dimension is preferably carried out in an inspection machine. The measuring arrangement can be arranged along the conveyor path in a variety of ways. It can Several measuring arrangements can also be provided for the independent testing of several bottles. If, in an inspection machine, a height measurement of the bottle should already be provided with sufficient accuracy for a reason other than the volume determination, the measurement result according to the invention can be used for volume inspection.

Die Ermittlung der linearen Abmessung kann aber auch separat von einer Inspektionsmaschine entlang des Flaschenförderweges, z.B. in einer Befüllstation, erfolgen.However, the linear dimension can also be determined separately from an inspection machine along the bottle conveyor path, e.g. in a filling station.

Vorzugsweise ist weiter eine Auswerfeinrichtung der Höhen- bzw. Volumenermittlung nachgeschaltet, die auf das Ermittlungsergebnis anspricht und als zu klein geworden ermittelte Flaschen aus dem Förderweg und damit aus dem Mehrwegumlauf auswirft.An ejection device is preferably connected downstream of the height or volume determination, which responds to the result of the determination and ejects bottles that have been found to be too small from the conveying path and thus from the reusable circulation.

Claims (10)

Verfahren zur Inspektion einer Kunststoff-Mehrwegflasche, insbesondere einer PET-Flasche, bezüglich deren Volumens, dadurch gekennzeichnet, dass mindestens eine lineare Abmessung der Flasche ermittelt wird.Method for inspecting a reusable plastic bottle, in particular a PET bottle, with regard to its volume, characterized in that at least one linear dimension of the bottle is determined. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Höhe der Flasche ermittelt wird.A method according to claim 1, characterized in that the height of the bottle is determined. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dss die ermittelte lineare Abmessung mit einem Sollwert verglichen wird, und dass die Flasche bei Unterschreiten dieses Sollwertes aus dem Mehrwegumlauf ausgeschieden wird.A method according to claim 1 or 2, characterized in that the linear dimension determined is compared with a target value, and that the bottle is eliminated from the reusable circulation when this target value is undershot. Verfahren nach einem der Ansprüche 1-3, dadurch gekennzeichnet, dass die lineare Abmessung mittels eines optischen Messverfahrens ermittelt wird.Method according to one of claims 1-3, characterized in that the linear dimension is determined by means of an optical measuring method. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass die Flasche teilweise durch einen aufgeweiteten Laserstrahl geführt wird, dessen Abschwächung durch den hindurchtretenden Flaschenteil ermittelt und als Mass für die lineare Abmessung genommen wird.A method according to claim 4, characterized in that the bottle is partially guided by an expanded laser beam, the attenuation of which is determined by the bottle part passing through and taken as a measure of the linear dimension. Verfahren nach Ansprüche 2 und 5, dadurch gekennzeichnet, dass die Flaschenoberkante von unten in ein vertikal aufgeweitetes Laserlichtband geführt wird, um die Höhe der Flasche zu ermitteln.Method according to claims 2 and 5, characterized in that the upper edge of the bottle is guided from below into a vertically widened laser light band in order to determine the height of the bottle. Flascheninspektionsmaschine zur Durchführung des Verfahrens nach einem der Ansprüche 1-6, mit einer Fördereinrichtung, welche Flaschen durch die Inspektionsmaschine fördert, dadurch gekennzeichnet, dass an mindestens einer Stelle entlang des Förderweges mindestens eine Messanordnung vorgesehen ist, durch welche die lineare Abmessung der jeweils an ihr vorbeigeförderten Flasche ermittelbar ist.Bottle inspection machine for carrying out the method according to one of claims 1-6, with a conveyor device which conveys bottles through the inspection machine, characterized in that at least one measuring arrangement is provided at at least one point along the conveyor path, by means of which the linear dimension of the respective one on it conveyed bottle can be determined. Flascheninspektionsmaschine nach Anspruch 7, dadurch gekennzeichnet, dass die Messanordnung einen Laserlichtsender, der einen bandförmig aufgeweiteten Laserstrahl erzeugt, einen davon beabstandeten Laserlichtempfänger und eine Auswertschaltung umfasst, um die Abschwächung des Laserstrahls durch die zwischen Sender und Empfänger durch den Laserstrahl geführt Flasche zu ermitteln.Bottle inspection machine according to claim 7, characterized in that the measuring arrangement comprises a laser light transmitter, which is a band-widened Laser beam generated, a laser light receiver spaced therefrom and an evaluation circuit to determine the attenuation of the laser beam by the bottle guided between the transmitter and receiver through the laser beam. Flascheninspektionsmaschine nach Anspruch 8, dadurch gekennzeichnet, dass die Inspektionsmaschine eine mit der Auswertschaltung zusammenwirkende Auswerteinrichtung umfasst, um Flaschen, welche die lineare Soll-Abmessung nicht erreichen, auszuscheiden.Bottle inspection machine according to claim 8, characterized in that the inspection machine comprises an evaluation device which interacts with the evaluation circuit in order to separate bottles which do not reach the linear target dimension. Verwendung des Höhenmessresultats der Höhenmessung von Kunststoff-Mehrwegflaschen, insbesondere PET-Flaschen, in einer Inspektionsmaschine zur Ermittlung des Volumens der Flasche.Use of the height measurement result of the height measurement of reusable plastic bottles, in particular PET bottles, in an inspection machine to determine the volume of the bottle.
EP93107540A 1992-07-07 1993-05-10 Method for inspecting the volume of plastic bottles and device for carrying out this method Expired - Lifetime EP0577950B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH214192 1992-07-07
CH2141/92 1992-07-07

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EP0577950A1 true EP0577950A1 (en) 1994-01-12
EP0577950B1 EP0577950B1 (en) 1997-04-16

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EP93107540A Expired - Lifetime EP0577950B1 (en) 1992-07-07 1993-05-10 Method for inspecting the volume of plastic bottles and device for carrying out this method

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EP (1) EP0577950B1 (en)
JP (1) JPH06194205A (en)
AR (1) AR247629A1 (en)
AT (1) ATE151671T1 (en)
BR (1) BR9302771A (en)
CA (1) CA2099959A1 (en)
DE (1) DE59306157D1 (en)
DK (1) DK0577950T3 (en)
MX (1) MX9304046A (en)
NO (1) NO932459L (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800011042A1 (en) * 2018-12-12 2020-06-12 Arol Spa PROCEDURE AND EQUIPMENT FOR DETECTION OF THE POSITION OF OBJECTS ON A CONVEYOR BELT

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FR2234615A1 (en) * 1973-06-21 1975-01-17 Platmanufaktur Ab
DE3314577A1 (en) * 1983-04-22 1984-10-25 Pierburg Gmbh & Co Kg, 4040 Neuss Method for measuring a deviation in length from the prescribed desired value
EP0123602A1 (en) * 1983-04-20 1984-10-31 Societe Nationale D'etude Et De Construction De Moteurs D'aviation, "S.N.E.C.M.A." Precision measuring method and device for the heights of rotor blades
US4906098A (en) * 1988-05-09 1990-03-06 Glass Technology Development Corporation Optical profile measuring apparatus

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JPS521676B2 (en) * 1971-09-14 1977-01-17
FR2346681A1 (en) * 1976-04-02 1977-10-28 Tourres Francois DEVICE FOR OPTICAL CONTROL OF THE PROFILE OF AN OBJECT, USING A PLAIN LASER BEAM
JPS5366386A (en) * 1976-11-26 1978-06-13 Hitachi Ltd Mechanical to electrical converter consisting of semiconductor

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Publication number Priority date Publication date Assignee Title
FR2234615A1 (en) * 1973-06-21 1975-01-17 Platmanufaktur Ab
EP0123602A1 (en) * 1983-04-20 1984-10-31 Societe Nationale D'etude Et De Construction De Moteurs D'aviation, "S.N.E.C.M.A." Precision measuring method and device for the heights of rotor blades
DE3314577A1 (en) * 1983-04-22 1984-10-25 Pierburg Gmbh & Co Kg, 4040 Neuss Method for measuring a deviation in length from the prescribed desired value
US4906098A (en) * 1988-05-09 1990-03-06 Glass Technology Development Corporation Optical profile measuring apparatus

Non-Patent Citations (1)

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Title
DATABASE WPIL Week 9048, Derwent Publications Ltd., London, GB; AN 90-360311 & SU-A-1 558 880 (GUSEV GLASS RES. INS.) 23. April 1990 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800011042A1 (en) * 2018-12-12 2020-06-12 Arol Spa PROCEDURE AND EQUIPMENT FOR DETECTION OF THE POSITION OF OBJECTS ON A CONVEYOR BELT
WO2020121235A1 (en) * 2018-12-12 2020-06-18 Ft System Srl Method and apparatus for determining the position of objects on a conveyor

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JPH06194205A (en) 1994-07-15
DK0577950T3 (en) 1997-10-27
EP0577950B1 (en) 1997-04-16
ATE151671T1 (en) 1997-05-15
DE59306157D1 (en) 1997-05-22
AR247629A1 (en) 1995-01-31
BR9302771A (en) 1994-02-08
NO932459D0 (en) 1993-07-06
CA2099959A1 (en) 1994-01-08
NO932459L (en) 1994-01-10
MX9304046A (en) 1994-02-28

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