WO1996018883A1

WO1996018883A1 - A method and an apparatus for identifying foreign bodies in packaged beverages, as well as use of the apparatus

Info

Publication number: WO1996018883A1
Application number: PCT/DK1995/000504
Authority: WO
Inventors: Claus Kirkegaard Laurberg
Original assignee: Carlsberg AS; Kjaergaard Industri Automatic AS
Current assignee: Carlsberg AS; Kjaergaard Industri Automatic AS
Priority date: 1994-12-13
Filing date: 1995-12-12
Publication date: 1996-06-20
Anticipated expiration: 1997-06-13
Also published as: US5864395A; MX9704405A; AU4253996A; CA2207710A1; CA2207710C; EP0797767A1; BR9509999A

Abstract

A method and an apparatus (10; 31) for identification of foreign bodies (4) in packaged beverages, where the package (1; 12; 30) and the beverage are translucent and the foreign bodies (4) have a density greater than that of the beverage. The method is unique in that the package (1; 12; 30) is oriented in a first position in which the foreign bodies (4) are collected on an internal, upwardly directed face (5) in the package (1; 12; 30), and that the package (1; 12; 30) is then turned to at least one subsequent inclined position having an inclination sufficient for the foreign bodies (4) to perform a downward movement along said face (5). During this movement, at least one of the foreign bodies (4) is identified by comparing at least two successive position-determining detections. This provides a method and an apparatus (10; 31) for certain identification of foreign bodies (4) in dark as well as light beverages and in disposable as well as recyclable packages (1; 12; 30).

Description

A method and an apparatus for Identifying foreign bodies In packaged beverages, as well as use of the apparatus

The present Invention concerns a method of Identifying foreign bodies In packaged beverages, where the package and the beverage are translucent, and the foreign bodies have a density greater than that of the beverage. The in¬ vention moreover concerns devices for performing the method and uses of said devices.

Methods of this type are known. In the performance of these known methods, the foreign bodies are identified manually in that an operator manually turns the package, while observing whether foreign bodies move in the bever- age. These known methods are not useful for identifica¬ tion of small foreign bodies, such as glass splinters, since they are frequently very difficult to observe. Fur¬ ther, it is not possible to identify foreign bodies with certainty in dark beverages owing to poor translucency. Finally, it has been found in practice that a large batch of beverages has to be rejected each time foreign bodies are observed in these. The reason is that the manual identification is performed only once an hour, and that it is desired not to place doubtful beverages with impu- rities on the market. Thus, the method is very expensive in the event that foreign bodies are observed in the bev¬ erages.

FR 2 607 589 discloses a method and a system for auto- matic identification of foreign bodies in glass bottles, in particular champagne bottles. The foreign bodies are detected using a spot scanner, while the bottle is turned about a vertical and a horizontal axis. However, this method does not enable the foreign bodies to be distin- guished from carbonic acid and air bubbles, for which reason the method has been found to be unuseful in prac- tice. Furthermore, the method cannot be applied to dark liquids at all.

Further, US 5 072 108 discloses a method wherein the bot- tie to be inspected is rotated rapidly and is photo¬ graphed durig the rotation. Scratches in the surface of the bottle will hereby be imaged as horizontal lines, while the foreign bodies in the non-rotating liquid can easily be identified. However, this method cannot be used for dark liquids either. It may likewise be a problem to detect foreign bodies at the domed bottom of the bottle.

The object of the invention is to provide a method of the type mentioned in the opening paragraph, wherein reliable identification of foreign bodies, in particular glass splinters, can be performed in both dark and light bever¬ ages. The method must be capable of identifying foreign bodies in both disposable packages and recyclable pack¬ ages in which scratches, flaws, etc. frequently occur. Another object of the invention is to provide an appara¬ tus for performing the method and to define uses of the apparatus.

The method of the invention is characterized in that the package is oriented in a first position in which the for¬ eign bodies are collected on an internal, upwardly di¬ rected face in the package, and the package is then turned to at least one subsequent inclined position which has an inclination sufficient for the foreign bodies to perform a downward movement along said face, during which at least one of these is identified by comparison of at least two successive position-determining detections. As a result, the method provides certain identification of foreign bodies having a density greater than that of the beverage in all types of translucent beverages. To identify foreign bodies, e.g. glass splinters, in packaged beverages, the package is first oriented in a position in which the foreign bodies are collected on an internal, upwardly directed face in the package. The package is then turned to at least one subsequent in¬ clined position, so that the foreign bodies perform a downward movement along the face. Simultaneously with or immediately after the turning, at least two position- determining detections of the packaged beverage are per- formed, during which any present foreign body which moves downwards is identified by comparison of the two detec¬ tions.

Further, all other foreign bodies having a density lower than that of the beverage, such as carbonic acid bubbles and other ingredients in the beverage, will move upwards with certainty, i.e. in a direction opposite to that of the foreign bodies which are to be detected, and even in liquid layers above these foreign bodies so that the movement of these other foreign bodies do not interfere with either the movement or the detection of the foreign bodies whose presence in the liquid is to be revealed.

Moreover, the foreign bodies to be revealed are collected and move within a well-defined region, viz. on the inner side of the upwardly directed face, so that they are gathered and easy to detect.

Expedient embodiments of the invention are defined in claims 2-12.

According to claim 2, the size of the foreign bodies is detected, thereby providing a more reliable detection and identification of any present foreign body. Further, it is possible to put a limit to the size of foreign bodies that are accepted in the comparison with predetermined values.

According to claim 3, the detections are performed in the same direction toward the package face. This obviates the necessity of taking the orientation of the package into consideration in the subsequent comparison of the detec¬ tions.

In another expedient embodiment, the detections are per¬ formed in a direction substantially at right angles to the package face. This ensures good imaging of the for¬ eign bodies which move along the inner side of the pack¬ age.

The invention moreover comprises an apparatus for identi¬ fying foreign bodies in packaged beverages and having the characteristic constructive features defined in claim 5. As a result, the apparatus can automatically perform identification of foreign bodies.

In a particularly expedient embodiment of the apparatus, the apparatus comprises a package holder which is fixed with respect to the detecting means with a view to sta- tionary identification, e.g. with respect to a passing transport column of packages from which a package is pe¬ riodically taken out for control. This ensures that impu¬ rities, flaws, scratches, etc. in the package are not identified as foreign bodies, since flaws, etc. will not be registered as moving bodies in the subsequent compari¬ son of the detection. This is a great advantage in the identification of foreign bodies in recycled bottles which almost always contain scratches, etc.

In another expedient embodiment of the apparatus, the ap¬ paratus comprises support means which are adapted to sup- port the packages during their transport, e.g. in a bot¬ tle column, with a view to continuous identification. It will hereby be possible to perform identification of for¬ eign bodies without removing the package from the bottle column. It will hereby be possible to check many bottles automatically within a short period of time.

The detecting means may advantageously be formed by one or more CCD cameras, since this enables automatic com- parison of the detections via a computer. Furthermore, the CCD camera has a broad wavelength range, which makes it possible to register e.g. red and infrared light.

According to claim 12, a light source is provided behind the package in alignment with the packaged beverage and each sensor. This ensures good imaging of any foreign bodies.

In a particularly expedient embodiment of the invention, the light source emits light having a wavelength of be¬ tween 600 and 900 nm. It is hereby possible to identify foreign bodies in even dark beverages.

The invention also comprises a use of said apparatus for identification of foreign bodies in beverages which are packaged in glass bottles. It is hereby possible to iden¬ tify foreign bodies in e.g. beer, soft drink, wine and medicine glass bottles.

The invention also comprises a use of said apparatus for identification of foreign bodies in beverages which are packaged in plastics bottles. It is hereby possible to identify foreign bodies in e.g. beer, soft drink, wine and medicine plastics bottles. The invention will be explained more fully below with reference to the drawing, in which

fig. 1 schematically shows a bottle arranged in a first position,

fig. 2 shows the same arranged in a second position, in which the glass splinters move downward and air bubbles move upwards,

fig. 3 shows an embodiment of an apparatus for performing the method in connection with spot tests,

fig. 4 is a schematic end view of another embodiment of an apparatus for performing the method, and

fig. 5 shows a bottle in four different positions accord¬ ing to an embodiment of the method.

Fig. 1 shows a section in a beer bottle 1 which is ar¬ ranged in a first substantially horizontal position, in which air and carbonic acid bubbles 2 as well as other foreign bodies having a density smaller than that of the beverage are collected in the liquid at the internal, downwardly directed face 3 of the bottle, and in which foreign bodies 4 in the form of glass splinters are col¬ lected along the internal, upwardly directed face 5 of the bottle.

The bottle 1 is then turned to at least one subsequent inclined position, one of which being shown in fig. 2. The shown inclined position has an inclination sufficient for the foreign bodies 4 to perform a downward movement along the internal, upwardly directed face 5 of the bot- tie, as shown by the arrow A. Air and carbonic acid bub¬ bles 2 move upwards in the liquid and then along the in- ternal, downwardly directed face 3 of the bottle in the opposite upward direction, as shown by the arrow B.

Then a plurality of position- and size-determining detec- tions are performed at the internal, upwardly directed face 5 of the bottle. The detections may advantageously be performed in an area around the constriction 6 of the bottle, but might also be performed at e.g. the mouth 7 or bottom 8 of the bottle, as shown in fig. 5. This fig- ure moveover shows that the bottle may be turned 180° in the turning movement. This may be particularly advanta¬ geous, if the bottle contains a liquid which tends to form very dense foam. Such a case involves the risk that any foreign bodies 4, if any, may be caught in the foam and therefore are not present on the upwardly directed face 5 in the bottle in the starting position. When the bottle 1 is turned 180°,foreign bodies, if any, will drop down into the liquid and settle on the upwardly directed face 5, in this case at the opening 7 of the bottle. The turning movement may then be continued until the detect¬ ing position is reached.

Then at least two successive position- and size- determining detections are compared, and at least one of the foreign bodies 4 is identified.

Detections are performed in a particularly advantageous embodiment of the invention in a direction substantially at right angles to the package face, so that the compari- son of the detections only reveals differences that are caused by foreign bodies 4 and thus not impurities, flaws, etc. in the package itself.

The invention also concerns an apparatus for performing the method. The apparatus comprises orienting means for orienting the package in a first position in which the foreign bodies are collected on an internal, upwardly di¬ rected face in the package, and then orienting the pack¬ age in at least one subsequent inclined position which has an inclination sufficient for the foreign bodies 4 to perform a downward movement along said face. The appara¬ tus moreover comprises detecting means which are adapted to perform position-determining detections of the foreign bodies 4 as well as means for identifying the foreign bodies 4 by comparison of at least two successive posi- tion-determining detections.

Fig. 3 shows an apparatus for identifying foreign bodies 4 in connection with spot tests of beer and soft drink bottles in a bottle column.

A robot arm 11 is arranged at the side of the apparatus 10, said robot arm 11 being adapted to take out bottles 12 from a bottle column 13 and to place them in the appa¬ ratus 10, and vice versa. This handling of bottles might also take place manually.

The apparatus 10 comprises orienting means 14 which are suspended from a structure 15 which stands on the floor in the immediate vicinity of the bottle column 13. The orienting means 14 comprise a motor (not shown) from which a frame 16 having a substantially centrally located bottle holder 17 is suspended.

In succession, the frame 16 moreover accommodates a light source 18, a diffuser 19, a lens having an optical filter 20 and a detecting means 21. All these elements will thus rotate and be mutually fixed, as shown by the arrows C and D, when the motor is activated.

The light source 18, which is arranged at one end of the frame, emits light having a wavelength of about 600-900 nm, thereby making it possible to identify foreign bodies 4 in dark beverages.

A diffuser 19 is arranged in front of the light source 18 and diffuses light from the light source 18, thereby pro¬ viding even illumination from the light source 18.

In the shown embodiment, the detecting means is formed by a CCD camera 21 in front of which the lens having the op- tical filter 20 is positioned. The CCD camera 21 focuses on an area around the constriction 6 of the bottle having an extent of about 3 x 3 cm and a depth of about 0-5 mm from the internal, upwardly directed face 5 of the bot¬ tle. The detections might also be performed at another location along the face of the bottle, provided that the foreign bodies 4 can perform a downward movement upon turning. The CCD camera 21 and the lens having the opti¬ cal filter 20 might advantageously also be built to¬ gether.

The CCD camera 21 is connected to a computer (not shown) which performs a comparison of the detections and then identifies any present foreign bodies 4. When identifying foreign bodies 4, the computer provides a signal to this effect so that the necessary actions can be performed. The computer may advantageously be coupled to a monitor, and in another embodiment the comparison might take place manually via the monitor.

In the use of the apparatus 10, the robot arm 11 takes out a bottle 12 from a bottle column 13 and places the bottle 12 in the bottle holder 17 which holds the bottle 12.

Then the motor performs a first rotation of the frame 16 and the parts attached to it (light source 18, diffuser 19, bottle holder 17, bottle 12, lens with optical filter 20 and CCD camera 21), so that the bottle 12 is placed in a substantially horizontal position. If the bottle holder 17 is horizontal in the starting position, it is not nec- essary to rotate the frame 16, of course. The frame 16 is maintained in this position for about 1-10 sec, so that any present foreign bodies 4 are collected along the in¬ ternal, upwardly directed face 5 of the bottle, as essen¬ tially shown in schematic form in fig. 1.

Then the second rotation is initiated, during which the motor rotates the frame 16 and the parts 18, 19, 17, 12,

20, 21 attached to it, with the simultaneous performance of a plurality of position- and size-determining detec- tions, e.g. at the constriction 6 of the bottle, as es¬ sentially shown in schematic form in fig. 2. The detec¬ tions are compared in the computer which applies a signal when identifying foreign bodies 4. It is noted that the rotation may be stepwise, if desired, and that the angle of the rotation depends on the bottle type, the size of the foreign bodies, etc.

When the identification has been completed, the robot arm 11 takes out the bottle 12 from the bottle holder 17, and a new identification sequence may be initiated.

Fig. 4 is a schematic end view of a plastics bottle 30 which performs a turning movement in another embodiment of an apparatus 31 for identification of foreign bodies 4 in beverages. The apparatus 31 is adapted to be used in connection with continuous identification of foreign bod¬ ies in a bottle column during the transport of the bottle

30 in the bottle column. It is noted that the apparatus

31 may also be used for other types of packages than plastics bottles. The distinctions from the above appara¬ tus 10 are described below. The orienting means of the apparatus 31 comprise support means 32 which are arranged along the sides of the bottle 30, and which are adapted to support the bottle 30 in several positions along a bottle column. It is shown in fig. 4 from the end how the bottle 30 in a bottle column will turn, as the support means 32 move the bottle 30 to this position in the column, while the bottle 30 is being fed by feeding means (not shown).

In an advantageous embodiment of the apparatus, the de¬ tecting means comprise a CCD camera 33 which follows the bottle 30 in the bottle column, as shown in fig. 4. It is thus ensured that the detections are performed in the same direction toward the bottle face, and in a particu- larly advantageous embodiment they are performed at right angles to the bottle face.

In another advantageous embodiment of the invention (not shown), the detecting means comprise several CCD cameras which are arranged stationarily along the bottle column. The CCD cameras are thus fixed, but the detections are performed in the same direction toward the bottle face.

In the use of the apparatus shown in fig. 4, the bottles are turned automatically, as the support means 32, which are arranged all the way along the bottle column, move the bottle 30 up to the necessary positions. Simultane¬ ously, a plurality of detections are performed with one or more cameras, and these are compared and any foreign bodies are identified in the same manner as described above.

As shown in figs. 3 and 4, the apparatus may be used in particular for identification of glass and plastics splinters in glass and plastics bottles (including PET bottles) in connection with the bottling of beer and soft drinks. The apparatus may also be employed for identifi¬ cation of other foreign bodies in e.g. medicine bottles, vials, jars, glass, wine bottles, etc., provided the package and the beverage are translucent and the foreign bodies have a density greater than that of the beverage.

In an embodiment of the apparatus of the invention (not shown), the detecting means are secured to the robot arm, and the robot arm is adapted to perform orientation of the package. The orienting means are thus formed by the robot arm, and it will not be necessary to place the package in an independent apparatus.

Many modifications can be made within the scope of the invention without departing from the idea of the inven¬ tion.

Infrared light having a wavelength of about 600-900 nm is used in the embodiment shown, but this is not any re- striction since other wavelengths may be used, provided they are within the detecting range of the detecting means. For CCD cameras, the sensitive wavelength range is thus about 300-1000 nm, so that all types of light having this wavelength can be used.

Claims

P a t e n t C l a i m s :

1. A method of identifying foreign bodies (4) in pack¬ aged beverages, where the package (1) and the beverage are translucent and the foreign bodies (4) have a density greater than that of the beverage, c h a r a c t e r ¬ i z e d in that the package (1) is oriented in a first position in which the foreign bodies (4) are collected on an internal, upwardly directed face (5) in the package (1), and the package (1) is then turned to at least one subsequent inclined position having an inclination suffi¬ cient for the foreign bodies (4) to perform a downward movement along said face (5), during which at least one of these (4) is identified by comparison of at least two successive position-determining detections.

2. A method according to claim 1, c h a r a c t e r ¬ i z e d in that the size of said identified foreign body (4) is detected and compared with predetermined values.

3. A method according to one or more of the preceding claims, c h a r a c t e r i z e d in that the detections are performed in the same direction toward the package face (1).

4. A method according to claim 3, c h a r a c t e r ¬ i z e d in that the detections are performed in a direc¬ tion substantially at right angles to the package face (1).

5. An apparatus (10; 31) for performing the method ac¬ cording to one or more of claims 1-4 for identification of foreign bodies (4) in packaged beverages, where the package (12) and the beverage are translucent and the foreign bodies (4) have a density greater than that of the beverage, c h a r a c t e r i z e d in that the ap- paratus (10; 31) comprises orienting means for orienting the package (12; 30) in a first position in which the foreign bodies (4) are collected on an internal, upwardly directed face (5) in the package (12; 30), and for then orienting the package (12; 30) in at least one subsequent inclined position having an inclination sufficient for the foreign bodies (4) to perform a downward movement along said face (5), and moreover comprises detecting means which are adapted to perform position-determining detections of the foreign bodies (4), and comprises means for identifying foreign bodies (4) by comparison of at least two successive position-determining detections.

6. An apparatus (10) according to claim 5, c h a r a c - t e r i z e d in that the orienting means comprise a separate package holder (17) which is fixedly connected with the detecting means with a view to stationary iden¬ tification.

7. An apparatus (10) according to claim 6, c h a r a c ¬ t e r i z e d in that the package holder and the detect¬ ing means fixedly connected with it are turnably sus¬ pended as a unitary assembly.

8. An apparatus (31) according to claim 5, c h a r a c ¬ t e r i z e d in that the orienting means comprise sup¬ port means (32) which are adapted to support the packages (30) during their transport in a package column with a view to continuous identification.

9. An apparatus (31) according to claim 8, c h a r a c ¬ t e r i z e d in that the detecting means are formed by at least two units arranged at two different, stationary positions along the package column.

10. An apparatus (31) according to claim 8, c h a r a c ¬ t e r i z e d in that the detecting means, during detec¬ tion, are adapted to follow the package (30) concerned during its transport in the package column.

11. An apparatus according to one or more of claims 5-10, c h a r a c t e r i z e d in that the detecting means comprise a CCD camera (21; 33).

12. An apparatus according to one or more of claims 5-11, c h a r a c t e r i z e d in that a light source (18) is provided behind the package (12; 30) in alignment with the packaged beverage and each detecting means.

13. An apparatus according to claim 12, c h a r a c ¬ t e r i z e d in that the light source (18) emits light having a wavelength of between 600 and 900 nm.

14. Use of an apparatus (10; 31) according to one or more of claims 5-13 for identification of foreign bodies (4) in beverages which are packaged in glass bottles (12).

15. Use of an apparatus (10; 31) according to one or more of claims 5-13 for identification of foreign bodies (4) in beverages which are packaged in plastics bottles (30).

A method and an apparatus for identification of foreign bodies in packaged beverages as well as use of the appa¬ ratus

ABSTRACT

A method and an apparatus (10; 31) for identification of foreign bodies (4) in packaged beverages, where the pack¬ age (1; 12; 30) and the beverage are translucent and the foreign bodies (4) have a density greater than that of the beverage. The method is unique in that the package (1; 12; 30) is oriented in a first position in which the foreign bodies (4) are collected on an internal, upwardly directed face (5) in the package (1; 12; 30), and that the package (1; 12; 30) is then turned to at least one subsequent inclined position having an inclination suffi¬ cient for the foreign bodies (4) to perform a downward movement along said face (5). During this movement, at least one of the foreign bodies (4) is identified by com- paring at least two successive position-determining de¬ tections. This provides a method and an apparatus (10; 31) for certain identification of foreign bodies (4) in dark as well as light beverages and in disposable as well as recyclable packages (1; 12; 30).