EP0577950B1 - 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 PDFInfo
- Publication number
- EP0577950B1 EP0577950B1 EP93107540A EP93107540A EP0577950B1 EP 0577950 B1 EP0577950 B1 EP 0577950B1 EP 93107540 A EP93107540 A EP 93107540A EP 93107540 A EP93107540 A EP 93107540A EP 0577950 B1 EP0577950 B1 EP 0577950B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bottle
- volume
- height
- detected
- linear dimension
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
Definitions
- 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 carrying out the method and the use of the result of the height measurement of such bottles in an inspection machine for determining the volume of the 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.
- 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.
- the bottle inspection machine according to the invention is equipped with a measuring arrangement for the linear dimension.
- Figure is a schematic representation of the measuring arrangement for the height measurement of a bottle
- FIG. 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 emits an analog voltage which is proportional to the amount of light received and which voltage can be processed.
- 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.
- 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.
- a predetermined lower limit corresponding to an upper limit for the amount of light received
- 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.
- the bottle stands on a floor or is conveyed with it, the distance to the measuring arrangement 4, 5, 6 being known and fixed.
- 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.
- 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.
- the linear dimension can also be determined separately from an inspection machine along the bottle conveyor path, e.g. in a filling station.
- 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.
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
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 und die Verwendung des Resultats der Höhenmessung von solchen Flaschen in einer Inspektionsmaschine zur Ermittlung des Volumens der Flaschen.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 carrying out the method and the use of the result of the height measurement of such bottles in an inspection machine for determining the volume of the bottles.
Es ist bekannt, z.B. aus US-A-4 852 415, 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 e.g. from US-A-4 852 415, reusable plastic bottles, which are known in particular as bottles made of PET (polyethylene terephthalate), to be inspected 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 Inspektionsleitung 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 management of modern bottle inspection machines is approx. 600 bottles per minute and should of course not be reduced by the target volume check.
Die Aufgabe wird erfindungsgemäss durch die kennzeichnenden Merkmale der Ansprüche 1 bzw. 7 bzw. 10 gelöst.The object is achieved according to the invention by the characterizing features of claims 1 or 7 or 10.
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
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
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
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)
- Method for inspecting a returnable plastics bottle, in particular a PET bottle, in respect of its volume, characterized in that the correlation between at least one selected linear dimension of the bottle and its volume is first of all determined for the specific type of returnable plastics bottle, in that this linear dimension is detected on each bottle in the course of the inspection, and in that the volume of the bottle is subsequently inferred from this dimension.
- Method according to Claim 1, characterized in that the height of the bottle is detected.
- Method according to Claim 1 or Claim 2, characterized in that the detected linear dimension is compared with a nominal value, and if it falls below this nominal value the bottle is taken out of circulation.
- Method according to any one of Claims 1 to 3, characterized in that the linear dimension is detected by an optical measuring technique.
- Method according to Claim 4, characterized in that the bottle is guided partly through a flattened laser beam whose attenuation due to the transit of the bottle is detected and adopted as a measure of the linear dimension.
- Method according to Claims 2 and 5, characterized in that the top of the bottle is made to pass into a vertically flattened strip of laser light, from below, in order that the height of the bottle can be detected.
- Bottle inspection machine for inspecting a returnable plastics bottle, in particular a PET bottle, in which the correlation between at least one selected linear dimension of the bottle and its volume is first of all determined for the specific type of returnable plastics bottle, with a conveyor device which conveys bottles through the inspection machine, characterized in that at least one measuring arrangement whereby the linear dimension of each bottle conveyed past it can be detected is provided at at least one point along the conveyor path, and in that means are provided for inferring the volume of the individual bottle from this dimension.
- Bottle inspection machine according to Claim 7, characterized in that the measuring arrangement comprises a laser light transmitter producing a laser beam in the form of a flattened strip, a laser light receiver distanced from the transmitter and an evaluation circuit, to detect the attenuation of the laser beam due to the transit of the bottle through the laser beam between transmitter and receiver.
- Bottle inspection machine according to Claim 8, characterized in that the inspection machine has a [rejector] device cooperating with the evaluation circuit to remove bottles which do not attain the nominal linear dimension.
- Use of the height readings obtained by measuring the height of returnable plastics bottles, in particular PET bottles, in an inspection machine for determining the volume of the bottle, characterized in that the correlation between the height of the bottle and its volume is first of all determined for the specific type of returnable plastics bottle, and in that the volume is subsequently inferred from the individual height reading obtained.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH214192 | 1992-07-07 | ||
| CH2141/92 | 1992-07-07 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0577950A1 EP0577950A1 (en) | 1994-01-12 |
| EP0577950B1 true EP0577950B1 (en) | 1997-04-16 |
Family
ID=4226834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| 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 |
Country Status (10)
| Country | Link |
|---|---|
| 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) |
Families Citing this family (1)
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS521676B2 (en) * | 1971-09-14 | 1977-01-17 | ||
| SE7308776L (en) * | 1973-06-21 | 1974-12-23 | Platmanufaktur Ab | |
| 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 |
| FR2544855B1 (en) * | 1983-04-20 | 1986-02-21 | Snecma | METHOD AND DEVICE FOR MEASURING THE PRECISION OF THE HEIGHT OF BLADES OF A ROTOR |
| 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 |
-
1993
- 1993-05-10 AT AT93107540T patent/ATE151671T1/en not_active IP Right Cessation
- 1993-05-10 DK DK93107540.2T patent/DK0577950T3/en active
- 1993-05-10 EP EP93107540A patent/EP0577950B1/en not_active Expired - Lifetime
- 1993-05-10 DE DE59306157T patent/DE59306157D1/en not_active Expired - Fee Related
- 1993-05-20 AR AR93324982A patent/AR247629A1/en active
- 1993-07-06 BR BR9302771A patent/BR9302771A/en not_active Application Discontinuation
- 1993-07-06 JP JP5166753A patent/JPH06194205A/en active Pending
- 1993-07-06 MX MX9304046A patent/MX9304046A/en not_active Application Discontinuation
- 1993-07-06 NO NO932459A patent/NO932459L/en unknown
- 1993-07-06 CA CA002099959A patent/CA2099959A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| NO932459D0 (en) | 1993-07-06 |
| ATE151671T1 (en) | 1997-05-15 |
| DE59306157D1 (en) | 1997-05-22 |
| AR247629A1 (en) | 1995-01-31 |
| JPH06194205A (en) | 1994-07-15 |
| BR9302771A (en) | 1994-02-08 |
| NO932459L (en) | 1994-01-10 |
| MX9304046A (en) | 1994-02-28 |
| DK0577950T3 (en) | 1997-10-27 |
| CA2099959A1 (en) | 1994-01-08 |
| EP0577950A1 (en) | 1994-01-12 |
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