Method and device for treating and monitoring the quality of objects comprising metal materials

Abstract

A method and a device for treating and monitoring objects incorporating a metal material. The objects are treated with a treatment fluid in one or more treatment zone(s) and the treatment fluid is then removed from and/or dried on the objects. To provide constant quality monitoring, at least one portion of at least one object respectively is optically detected and calorimetrically evaluated. In this manner, discoloration of metal materials caused by the treatment can be promptly detected.

Claims

1. A method for treating and monitoring objects comprising containers formed of a metal material, the method comprising the following steps: filling the objects with foodstuff and closing the objects; treating the filled objects with a treatment fluid in a treatment zone or in several treatment zones, wherein a respective external face of each of the objects is treated with a tempered treatment fluid in at least one of the treatment zones and wherein the foodstuff is pasteurized in the at least one treatment zone during the step of treating; thereafter removing or drying the treatment fluid from the objects treated, optically detecting by means of a color-detecting detection device at least one portion comprising metal material of at least one of said treated objects to provide constant monitoring after treating the objects, wherein the step of optically detecting is performed after the step of treating, and colorimetrically evaluating the optically detected data of the at least one portion with an evaluation device by determining a color value of a color space or several color values of a color space.

2. The method according to claim 1, wherein the objects are conveyed by means of a conveyor in a transport direction through one or more consecutive treatment zones, and after being conveyed through a last one of the consecutive treatment zones in the transport direction, the at least one portion of the at least one object is optically detected.

3. The method according to claim 1, wherein the at least one object is conveyed through a control zone comprising the color-detecting detection device.

4. The method according to claim 1, wherein the objects comprise an aluminum material and are treated with aqueous treatment fluid, and wherein at least one portion comprising aluminum material of the at least one object is optically detected.

5. The method according to claim 1, wherein the objects are treated with a treatment fluid having a temperature of between 45 C. and 130 C. in at least one treatment zone.

6. The method according to claim 1, wherein the treatment fluid is removed from the at least one object prior to optical detection of the at least one portion.

7. The method according to claim 1, wherein a detection area of the color-detecting detection device is screened off with a screening element, and the at least one portion of the at least one object to be optically detected is illuminated with white light by an illuminating device.

8. The method according to claim 7, wherein a light intensity of the illuminating device for the at least one portion to be optically detected is adapted to a conveying speed of the object to be optically detected through the control zone.

9. The method according to claim 1, wherein a threshold value is set for the colorimetrically determined color value(s) and the color value(s) is/are compared with the associated threshold value.

10. The method according to claim 9, wherein when a set threshold value is exceeded by a color value associated with this threshold value, an action is implemented or several actions are implemented.

11. The method according to claim 10, wherein the action comprises triggering an alarm.

12. The method according to claim 10 wherein the action comprise a change to the chemical composition of the treatment fluid.

13. The method according to claim 12, wherein the action comprises adjusting the pH value of the treatment fluid or adding inhibitors to the treatment fluid or adding water hardness regulators to the treatment fluid.

14. The method according to claim 10, wherein the action comprises varying a conveying speed of the objects through treatment zone(s) or halting conveying.

15. The method according to claim 10, wherein the action comprises varying an intake temperature of a treatment fluid fed into a treatment zone.

16. The method according to claim 1, wherein the at least one optically detected portion of the at least one object is colorimetrically evaluated in the L*a*b* color space, and the L* color value and/or a* color value and/or b* color value is colorimetrically determined.

17. The method according to claim 1, wherein the at least one portion of the at least one object is optically detected by an imaging detection device.

18. The method according to claim 17, wherein the optically detected image of the at least one portion is broken down into part-images comprising regions or image positions, and each part-image is colorimetrically evaluated separately.

19. The method according to claim 1, wherein a test object is treated with treatment fluid together with the objects to be treated, and a portion of the test object comprises a metal material and is optically detected by the color-detecting detection device after the treatment.

20. The method according to claim 19, wherein the test object is conveyed through treatment zone(s) together with the objects to be treated.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) To provide a clearer understanding, the invention will be described in more detail below with reference to the appended drawings.

(2) These are highly simplified, schematic diagrams illustrating the following:

(3) FIG. 1 an example of an embodiment of a device for treating and monitoring objects incorporating a metal material, in a side view;

(4) FIG. 2 parts of an example of an embodiment of a device for treating and monitoring objects incorporating a metal material, in a plan view;

(5) FIG. 3 parts of another example of an embodiment of a device for treating and monitoring objects incorporating a metal material, in a plan view;

(6) FIG. 4 parts of another example of an embodiment of a device for treating and monitoring objects incorporating a metal material, in a plan view;

(7) FIG. 5 parts of another example of an embodiment of a device for treating and monitoring objects incorporating a metal material, in a plan view;

(8) FIG. 6 a plan view of an optically detected portion of a treated object.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(9) Firstly, it should be pointed out that the same parts described in the different embodiments are denoted by the same reference numbers and the same component names and the disclosures made throughout the description can be transposed in terms of meaning to same parts bearing the same reference numbers or same component names. Furthermore, the positions chosen for the purposes of the description, such as top, bottom, side, etc., relate to the drawing specifically being described and can be transposed in terms of meaning to a new position when another position is being described.

(10) FIG. 1 is a schematic side view illustrating an example of an embodiment of a device 1 for treating and controlling and/or monitoring the quality of objects 2 incorporating a metal material, in particular an uncoated metal material. The device 1 illustrated as an example of an embodiment is a pasteurizing apparatus 3 or so-called tunnel pasteurizer in which objects 2, in particular in the form of containers 4, can be treated with a treatment fluid 5.

(11) The device 1 and the method will be explained in more detail below on the basis of the examples of embodiments of a pasteurizing apparatus 3 illustrated in the drawings. At this stage, it should be noted that this is only an example of a device 1 and an example of a method and both the device 1 and method might also be different from the specific examples of embodiment of methods and devices for treating metal materials with a treatment fluid. The device 1 and method for treating with treatment fluid and monitoring may also be part of a higher-level method and/or part of a higher-level device. The objects 2 comprising a metal material may be metal containers or closing caps for glass containers or plastic containers, for example screw-caps made of metal material, or the like.

(12) In the case of the pasteurizing apparatus 3 illustrated in FIG. 1 as an example of a device 1, the objects 2 in the form of containers 4 may be filled with contents, in particular a foodstuff, and closed prior to the treatment with treatment fluid, for example. The objects 2 or containers 4 may comprise an aluminum material as the metal material, for example. In particular, the objects 2 or containers 4 treated with treatment fluid 5 in the device 1 or pasteurizing apparatus 3 may be aluminum drink cans, for example, filled with a liquid foodstuff. In such cases, the containers 4 may be closed so as to be liquid-tight or at least as liquid-tight as possible.

(13) For treating the objects 2 or containers 4, the device 1 may comprise a treatment zone 6 or several treatment zones 6. In the example of an embodiment of a pasteurizing apparatus 3 illustrated in FIG. 1, the device 1 comprises three treatment zones 6 for treating the objects 2 with a treatment fluid 5. The three treatment zones 6 each have at least one intake means 7, and in the example of an embodiment illustrated have several intake means 7 for feeding and supplying the treatment fluid 5 into the treatment zones 6. The intake means 7 may be provided in the form of pipelines 8, for example. Furthermore, the intake means 7 may have distributor means 9, such as sprinkler devices or spray nozzles etc., by means of which the treatment fluid 5 can be distributed in the treatment zone(s) 6.

(14) In this manner, during operation of the device 1 or pasteurizing apparatus 3 illustrated as an example in FIG. 1, the method for treating and controlling and/or monitoring, the quality of objects 2 comprising a metal material can be implemented.

(15) The objects 2 or illustrated aluminum containers 4 are treated with a treatment fluid 5 in the treatment zone(s) 6. In the example of an embodiment of the device 1 illustrated in FIG. 1, the latter are so-called tunnel pasteurizers, and the treatment fluid 5 is applied to and acts on a respective external face 10 of the objects 2 or containers 4 in the treatment zones 6.

(16) The treatment fluid 5 for treating the objects 2 can be reused, in other words can be used repeatedly for treating the objects 2 in the treatment zone(s) 6. To this end, the treatment fluid 5 is circulated in a circuit (not illustrated) for example, and is repeatedly delivered to the treatment zone(s) 6.

(17) In particular, the objects 2 or containers 4 comprising a metal material are treated with an aqueous treatment fluid 5. Generally speaking, treatments with an aqueous treatment fluid 5 may have advantages from several points of view. For example, cleaning or surface or tempering treatments of objects 2 incorporating a metal material can be effectively operated using an aqueous treatment fluid 5. This is especially the case because the properties of aqueous fluids can be readily and very effectively adjusted by adding chemicals. By using an aqueous treatment fluid 5 with an appropriate chemical composition, a respective metal material of the objects 2 can be treated in a specific way. Furthermore, aqueous treatment fluids 5 can be tempered in a relatively broad temperature range and aqueous treatment fluids are generally readily available.

(18) The objects 2 or containers 4 to be treated are preferably conveyed to the device 1 by a conveyor means 11 which is used to convey the objects 2 through the treatment zone 6 or through several consecutive treatment zones 6. Such a conveyor means 11 might be a conveyor belt, for example, on which the objects 2 can be placed or positioned. In the case of the pasteurizing apparatus 3 illustrated in FIG. 1 as an example of a device 1, two such conveyor means 11 are provided so that the objects 2 or containers 4 filled with foodstuff can be conveyed through the consecutive treatment zones 6 in two conveyor planes one above the other in a transport direction 12 during operation of the device 1.

(19) In order to treat the objects 2 or containers 4 in the treatment zone(s) 6, a respective external face 10 can be treated with a tempered treatment fluid 5 in the treatment zones 6. To this end, the device 1 may comprise a heating mechanism 13 for heating the treatment fluid 5 and a cooling mechanism 14 for cooling the treatment fluid 5. By these devices 13, 14 for tempering the treatment fluid 5 and/or also by mixing treatment fluids at different temperatures, a respective treatment zone 6 can be supplied with treatment fluid 5 at a specifically set temperature.

(20) Heating mechanism 13 and cooling mechanism 14 are only schematically indicated in each case in FIG. 1. Naturally, depending on the system or apparatus, one or more heating mechanism 13 and cooling mechanism 14 may be provided. For example, heat exchangers may be provided, through which heating or cooling medium is circulated, by means of which the treatment fluid 5 can be heated or cooled to a specific degree. Such heat exchangers may in turn be supplied by heating and/or cooling devices. For example, steam heaters or cooling towers or heat pumps may be used for this purpose.

(21) In the case of the example of an embodiment of a pasteurizing apparatus 3 or tunnel pasteurizer illustrated in FIG. 1, at least a first treatment zone 6 may be used as a way of heating the objects 2 or containers 4, for example the left-hand treatment zone 6 illustrated in in FIG. 1. This treatment zone may be supplied with a heated treatment fluid 5 for heating or pre-heating the objects 2 or containers 4. Furthermore, relative to the transport direction 12 of the objects 2, at least a second treatment zone 6 for additionally heating the objects 2 or containers filled with foodstuff 4 may be disposed after the first treatment zone 6. Furthermore, relative to the transport direction 12 of the objects 2, at least a third treatment zone 6 for cooling the objects 2 or containers 4 may be disposed after the second treatment zone 6. It would naturally also be possible to provide more than one treatment zone 6 respectively for heating, further heating and cooling.

(22) The treatment, zones 6 illustrated in FIG. 1 may be supplied with an appropriately tempered treatment fluid 5 for the purpose of heating, further heating and finally cooling the objects 2 respectively. For example, the objects 2 can be treated in at least one treatment zone 6 with a treatment fluid 5 having a temperature of between 45 C. and 130 C., In particular in the case of the pasteurizing apparatus 3 illustrated as an example in FIG. 1, the objects 2 or filled and closed containers 4, can be treated in at least one treatment zone 6, in particular in treatment zone 6 illustrated in the middle in FIG. 1, with a treatment fluid 5 having a temperature of between 50 C. and 100 C., preferably having a temperature of between 60 C. and 90 C., Based on this operating mode, the foodstuff in the closed containers 4 can be pasteurized in the at least one treatment zone 6.

(23) As also illustrated in FIG. 1, the device 1 may be provided with another treatment zone 15 for removing or drying the treatment fluid 5 on the objects 2. This other treatment zone 15 for removing the treatment fluid 5 from the objects 2 or containers 4 may be disposed after the treatment zone(s) 6 for treating with treatment fluid 5 in the transport direction 12 of the objects 2. The objects 2 having been treated with treatment fluid 5, the treatment fluid 5 is removed from the treated objects 2 or dried in this other treatment zone 15.

(24) This being the case, the treatment fluid 5 may be drained and/or evaporated off the objects 2 or containers 4 in the other treatment zone 15, for example. This may be done passively and without additional aids. The drained and draining treatment fluid 4 may be collected in a collection container 16 for example, and fed away from the device 1 or reused. As an alternative to the example of an embodiment, illustrated in FIG. 1, removal or drying may be done actively, i.e. assisted by appropriate means. Such drying methods and the configuration of such other treatment zones 6 for removing and/or drying the treatment fluid 5 on objects 2 will be explained in more detail below with reference to other examples of embodiments.

(25) The essential thing for the device 1 is that a control zone 17 is provided, as also illustrated in FIG. 1. Disposed in this control zone 17 for constantly monitoring the objects 2 treated with treatment fluid 5 is a color-detecting or color-measuring detection device 18 for optically detecting at least one portion 19 of at least one object 2 incorporating an uncoated metal material treated with treatment fluid 5. As may also be seen from FIG. 1, the color-detecting detection device 18 is connected to an evaluation device 20 by signal transmission to enable the optically detected data relating to the at least one portion 19 to be processed. This being the case, the evaluation device 20 is configured to colorimetrically evaluate the supplied data by determining a color value or several color values.

(26) During operation of the device 1 or the illustrated pasteurizing apparatus 3, at least one portion 19 comprising a metal material respectively of at least one object 2 treated with treatment fluid 5 is optically detected by means of the color-detecting or color-measuring detection device 18, thereby providing constant monitoring, after treating the objects 2 in this manner. The optically detected data of the at least one portion 19 is calorimetrically evaluated by means of an evaluation device 19 by determining a color value or several color values. This colorimetric evaluation may be implemented on the basis of a color model for example, whereby numerical characteristic values are defined in order to characterize or define a color.

(27) Defects caused by the treatment can therefore be picked up by detecting and colorimetrically evaluating discoloration of metal materials constantly during the operation of treating the objects 2 with treatment fluid 5. This in turn enables the efficiency of the treatment with treatment fluid 5 to be improved because if discoloration is detected based on the colorimetric evaluation, counter-actions can be initiated in order to prevent defective treatment.

(28) The color-detecting detection device 18 may in principle be any type of detection device by means of which light and/or colors can be reliably detected, for example by color measuring devices operating on the basis of spectral resolution and/or spectral photometry. In principle, the detection device 18 may comprise a plurality of detection means, for example color sensors or color measuring devices for detecting several portions 19 or even all of the portions respectively of the at least one object 2 or container 4 treated with treatment fluid 5. In most cases, however, optical detection can be limited to one portion 19 of an object 2. In particular, this may be a portion 19 where a change due to treatment with a treatment fluid 5 is particularly likely. In the case of the pasteurizing apparatus 3 illustrated as an example of an embodiment of a device 1 in FIG. 1, an upper or upwardly directed portion 19 of the objects 2 or containers 4, for example, is monitored by optical detection and colorimetric evaluation, as illustrated.

(29) In the example of a device 1 for treating objects 2 incorporating a metal material, illustrated in the form of a pasteurizing apparatus 3, aluminum containers 4 or aluminum cans filled with a foodstuff, in particular a drink, may be the objects 2 incorporating an aluminum material that are treated with aqueous treatment fluid 5 and then monitored, for example. In this instance, it may be of advantage for at least one portion 19 incorporating aluminum material respectively of the at least one object 2 to be optically detected. In this manner, discoloration such as often occurs during a treatment of objects incorporating aluminum material 2 with aqueous treatment fluid 5, namely so-called wet storage stain or water staining, can be optically detected and colorimetrically evaluated. Such aluminum containers 4 usually have a closure or opening tab in the form of a so-called stay-on tab in an upper portion 19 or on the top face. Experience has shown that this portion 19 is particularly susceptible to discoloration and can undergo color changes particularly rapidly during a treatment with aqueous treatment fluid 5. In particular, discoloration or water staining can occur first and foremost in this portion 19 during the course of treating such aluminum containers 4 with treatment fluid, which is why it is particularly meaningful to optically detect and colorimetrically evaluate this portion 19 to enable discoloration of the corresponding objects 2 to be detected rapidly and reliably.

(30) As may also be seen from FIG. 1, the at least one portion 19 respectively of the at least one object 2 or the at least one container 4 treated with treatment fluid 5 can be optically detected after being conveyed through the last consecutive treatment zone 6 in the transport direction 12. To this end, the control zone 17 for the objects 2 or containers 4 may be disposed after the last treatment zone 6, 15 relative to the transport direction 12. The at least one object 2 to be optically detected may be conveyed respectively through the control zone 17 comprising the color-detecting detection device 18. To this end, the conveyor 11 can be configured to convey the at least one object 2 respectively through the control zone 17, for example.

(31) Generally speaking, there are several possible ways of implementing quality control and/or monitoring of the objects 2 incorporating a metal material after their treatment with treatment fluid 5. One possible option is illustrated in FIG. 2 and FIG. 2 illustrates parts of an example of an embodiment of a device 1 for treating and controlling and/or monitoring the quality of objects 2 incorporating a metal material. To provide better clarity, the device 1 is shown in a plan view. The same reference numbers and component names are used in FIG. 2 to denote parts that are the same as those described above in connection with FIG. 1. To avoid unnecessary repetition, reference may be made to the more detailed description of FIG. 1 given above. In FIG. 2 and also in all the subsequent drawings, only a few of the objects 2 or containers 4 are illustrated in order to retain better clarity. In reality, of course, the objects 2 are packed into the device 1 as densely as possible and treated with treatment fluid 5.

(32) As may be seen from FIG. 2, the color-detecting detection device 18 can be disposed and/or oriented in the control zone 17 in such a way that at least a part quantity can be constantly or continuously monitored, or at least one of the treated objects 2 or containers 4 can be constantly monitored by optically detecting the at least one portion 19. In the embodiment illustrated as an example, at least one portion 19 of at least one object 2 or container 4 disposed in a side row on the conveyor 11 in the transport direction 12 is optically detected, for example. Naturally, the color-detecting detection device 18 could also be configured to optically detect at least one object 2 in a centrally disposed row of objects 2 treated with treatment fluid 5 on the conveyor 11 by reference to the transport direction 12. As an alternative to the example of an embodiment illustrated in FIG. 2, it would also be possible to separate out a part quantity of treated objects 2 in order to optically detect the at least one portion 19. This may be done, for example, by diverting a part quantity of treated objects 2 by means of a deflection device, which might be a baffle element, for example a baffle plate, and then feeding them through a control zone 17.

(33) In principle, it is also possible to optically detect at least one treated object 2 respectively of several rows of objects 2 disposed in the transport direction 12. It would naturally also be conceivable for all of the objects 2 treated with treatment fluid 5 to be optically detected by means of the color-detecting detection device 18.

(34) To this end, the color-detecting detection device 18 may comprise a detector with a detection range of large dimensions for example, or alternatively several detectors, as indicated in FIG. 3. In FIG. 3 again, the same reference numbers and component names are used to denote parts that are the same as those described in connection with FIG. 1 and FIG. 2 above. To avoid unnecessary repetition, reference may be made to the more detailed description of FIG. 1 and FIG. 2 given above.

(35) Generally speaking, the detection device 18 can be positioned at various points in the control zone 17 to enable different portions 19 incorporating a metal material to be detected respectively.

(36) In principle, both in the case of the example of an embodiment illustrated in FIG. 2 and that in FIG. 3, as well as quite generally, the color-detecting detection device 18 can be configured to optically detect at least one of the objects 2 or containers 4 treated with treatment fluid 5 respectively at set time intervals. Optical detection may also be run after treating a specific, set number of objects 2 with treatment fluid 5, for example.

(37) Alternatively, it would naturally also be possible for at least a part quantity of the treated objects 2 to be optically detected on a continuous basis. In particular, in the case of the embodiment illustrated as an example in FIG. 2 or FIG. 3, a detection frequency of the respective color-detecting detection device 18 can be coupled with timing of the conveying frequency of the objects 2 or containers 4 through the control zone 17. In this connection, it would also be possible for the frequency of the colorimetric evaluation to be coupled with the detection frequency.

(38) Furthermore, an illuminating brightness of the illuminating device 27 for the at least one portion 19 to be optically detected can be adapted to a speed at which the object 2 to be optically detected is conveyed through the control zone 17. This primarily enables a sufficient illuminating brightness to be obtained respectively for different illumination times for the at least one portion 19 to be optically detected respectively, depending on the conveying speed. In this respect, a conveying speed may also depend on the frequency at which the object 2 to be optically detected is conveyed through the control zone 17.

(39) In the case of the embodiment illustrated as an example in FIG. 3, another treatment zone 15 is provided for removing and/or drying the treatment fluid 5 from the objects 2 treated with treatment fluid 5. As an alternative to the embodiment of another treatment zone 15 illustrated as an example in FIG. 1, residues of treatment fluid can also be actively removed from the treated objects 2 or containers 4, as illustrated in FIG. 3. To this end, the other treatment zone 15 illustrated in FIG. 3 can be provided with hot air fans 21, for example, by means of which an active or assisted removal of the treatment fluid 5 from the treated objects 2 can be implemented.

(40) With a view to preventing the optical detection of the at least one portion 19 and the colorimetric evaluation of the detected portion 19 from being affected by treatment fluid 5 or treatment fluid residues, an additional zone 22 may also be provided for actively removing treatment fluid 5 from the objects 2 to be optically detected as rapidly and completely as possible, as illustrated in FIG. 2 for example. In the embodiment illustrated as an example in FIG. 2, an additional zone 22 for removing treatment fluid 5 from the at least one object 2 presented for optical detection is disposed after the last treatment zone 6 for treating the objects 2 with treatment fluid 5 relative to the transport direction 12 of the objects 2 This additional zone 22 may in turn be provided with a hot air fan 21, for example, or some other drying means. In the embodiment illustrated as an example in FIG. 2, such an additional zone 22 is disposed in this instance parallel with the other treatment zone 15 for passively removing treatment fluid 5 from objects 2 or containers 4 that will not be presented for optical detection. In the additional zone 22 for active removal, the treatment fluid 5 on the at least one object 2 respectively that will be presented for optical detection can be removed and treatment fluid 5 can be removed as completely and rapidly as possible. Relatively speaking, this is faster than the passive drying of objects 2 treated with treatment fluid 5 that takes place in the other treatment zone 15.

(41) FIG. 4 illustrates another and optionally independent embodiment of the device for treating objects incorporating a metal material with treatment fluid, the same reference numbers and component names being used to denote parts that are the same as those described above in connection with FIG. 1 to FIG. 3. To avoid unnecessary repetition, reference may be made to the more detailed description, of FIG. 1 to FIG. 3 given above.

(42) In principle, as illustrated in FIG. 4, detection may also be operated on a random basis. For example, at specific points in time, an object 2 or container 4 treated with treatment fluid 5 may be taken from the conveyor means 11 for optically detecting the at least one portion 19 incorporating a metal material and conveyed to a separately disposed control zone 17, as illustrated in FIG. 4. A random sample can be manually picked, i.e. by an operator by hand for example, in which case an object 2 to be optically detected can be picked up from the conveyor means 11, dried by wiping it and then taken to a control zone. As illustrated in FIG. 4, this removal process may naturally also be mechanically operated, in particular on an automated basis, for example by means of a removal mechanism 23. Such a removal mechanism 23 might be a mechanical gripper, a suction cup type of gripping element operated at vacuum pressure or any other gripping device for gripping or removing the at least one object 2 or container 4 respectively to be presented for optical detection. Alternatively, individual treated objects 2 to be presented for optically detecting the at least one portion 19 may also be removed by means of a pivotable deflector device, for example by means of a deflector element or baffle plate, after which the separated or deflected objects 2 are conveyed through the control zone 17.

(43) In the case of the embodiment illustrated as an example in FIG. 4, another conveyor device 24 is provided for conveying the at least one object 2 to be presented for optical detection through the separately disposed control zone 17. Furthermore, in the case of the device 1 or pasteurizing apparatus 3 exemplarily and partially illustrated here, the other conveyor device 24 also conveys an object 2 to be presented for optical detection respectively through an additional zone 22 for removing the treatment fluid 5 and/or removing treatment fluid residues from the at least one object 2 to be presented for optical detection respectively before it is conveyed through the control zone 17.

(44) FIG. 5 illustrates another and optionally independent embodiment of the device for treating objects incorporating a metal material with treatment fluid, the same reference numbers and component names being used to describe parts that are the same as those described in connection with FIG. 1 to FIG. 4 above. To avoid unnecessary repetition, reference may be made to the more detailed description of FIG. 1 to FIG. 4 given above.

(45) FIG. 5 illustrates an example of an embodiment of a device 1 in which a test object 25 is disposed on the conveyor 11 and the color-detecting detection device 18 is disposed in the control zone 17 for optically detecting at least one portion 19 of this test object 25 incorporating a metal material. To save on space, such a test object 25 may be disposed in a peripheral region of the conveyor 11, for example. Furthermore, such a test object 25 may be of small dimensions compared with the other treated objects 2. This in turn offers advantages in terms of the dimensions necessary for the control zone 17, which can likewise be designed with relatively small dimensions in this case.

(46) Based on the example of an embodiment illustrated in FIG. 5, the test object 25 is treated with treatment fluid together with the objects 2 to be treated. To this end, the test object 25 can be conveyed through the treatment zone(s) 6 together with the objects 2 to be treated. After being treated with treatment fluid 5, a portion 19 of the test object 25 incorporating metal material can be optically detected by means of the color-detecting detection device 18.

(47) Such a test object 25 might be used, to imitate or model a portion of the objects 2 to be treated that is particularly susceptible to discoloration, for example. For example, if can-type aluminum containers 4 are to be treated in the pasteurizing apparatus 3 illustrated as an example of a treatment device 1, the test object 25 may be provided in the form of a closure or so-called stay-on tab of the aluminum containers 4. These closure and/or opening tabs of aluminum containers 4 have proved to be particularly susceptible to discoloration or water staining during the course of a treatment for pasteurization purposes.

(48) As also illustrated in FIGS. 1 to 5, it may be preferable to provide a respective control zone 17 with means 26 for partitioning off and/or screening off ambient light and an illuminating device 27, in particular an LED-illuminating device, for illuminating the at least one portion 19 of the at least one object 2 respectively with white light, in this manner, a detection area of the color-detecting detection device 18 in a control zone 17 can be at least largely closed or screened off from the prevailing ambient light and the at least one portion 19 of the at least one object 2 to be optically detected by means of the illuminating device 27 respectively, in particular LED-illuminating device, can be illuminated with white light.

(49) As a result of these features or actions, the optical detection conditions for the at least one portion 19 incorporating a metal material of the at least one object 2 to be presented for optical detection can be made as uniform and reproducible as possible. The means 26 for partitioning or screening off the respective ambient light may be provided in the form of light-impermeable wall-type surrounding or screening elements 28 for the control zone 17, for example, thereby providing a control zone 17 surrounded by a tunnel-type or roof-type screening element, as illustrated in FIG. 1 to FIG. 4.

(50) The white light-illuminating device 27 may comprise one or more light sources 29, preferably LED-light sources. The number and disposition of LED-light sources 29 in the control zone 17 may be freely selected in such a way that the at least one portion 19 of the at least one object 2 or container 4 respectively presented for detection is lit or illuminated sufficiently and as uniformly as possible with white light.

(51) As may also be seen from FIG. 1 to FIG. 5, the color-detecting detection device 18 may comprise an imaging and/or color imaging detector 30, in particular a color camera. Accordingly, the at least one portion 19 of the at least one object to be detected 2 respectively to be optically detected can be detected and/or imaged by means of an imaging detector 30, in particular a color camera during operation of the device 1.

(52) Detecting a color image in particular enables the options for the calorimetric evaluation by the evaluation device 20 to be increased. In this connection, it may be for example that the optically detected image of the at least one portion 19 is broken down into part-images 31 and every part-image 31 is colorimetrically evaluated separately, as schematically illustrated in FIG. 6. In this manner, discoloration in the at least one detected portion 19 can be analyzed on the basis of areas or part-images using resolution. This enables points or areas exhibiting maximum discoloration to be identified, for example.

(53) In principle, the evaluation device 20 may be disposed structurally separately from the detection device 18, as also schematically illustrated in FIGS. 1 to 5 respectively. Any type of data transmission means may be used to transmit the optically detected data to the evaluation device 20 in principle. A hard-wired or wireless signal connection 32 may be provided between the color-detecting detection device 18 and the evaluation device 20, as illustrated in FIG. 1 to FIG. 5. The evaluation device 20 itself may be provided in the form of a software controllable computer unit for example, such as a PC or a tablet. In principle, however, the evaluation device 20 may be an integral component of the detection device 18, for example color sensors with an integrated evaluation device 20 based on a color model.

(54) The colorimetric evaluation by means of the evaluation device 20 may preferably be implemented in such a way that the at least one optically detected portion 19 of the at least one object 2 is respectively evaluated in the L*a*b* color space and the L* color value and/or a* color value and/or b* color value is calorimetrically determined on the basis of an evaluation.

(55) The L*a*b* color space constitutes a color model for calorimetric evaluation which is independent of any device and which is defined as close as possible to human perception. Accordingly, any discoloration of metal materials can also be evaluated as effectively as possible in terms of human perception of discoloration.

(56) Based on the pasteurizing apparatus 3 illustrated as an example of a device 1 in FIG. 1 to FIG. 5 designed for containers 4 incorporating an aluminum material and objects 2 filled with foodstuff, the objects can be treated with tempered aqueous treatment fluid 5 for pasteurization purposes. With such treatments and/or processes involving objects 2 incorporating aluminum using aqueous treatment fluid 5, so-called water staining of the aluminum material often occurs for example. However, this discoloration of aluminum materials known as wet storage stain is often difficult to detect and/or evaluate. In such cases, the b* color value can be numerically generated or determined on the basis of colorimetry. The b* color value is particularly well suited to colorimetric evaluation of wet storage stain. In particular, it has been found that brownish to black discoloration due to water staining can be evaluated particularly well using colorimetry to determine the b* color value. In particular in the event of wet storage stain, a significant increase in the b* color value towards higher, positive values can be ascertained or observed compared with an untreated aluminum material or a clean aluminum surface. Alternatively and/or in addition, if optically detected wet storage staining occurs in the at least one optically detected portion 19, a colorimetric evaluation may also be implemented by determining the L* color value, which defines the brightness or luminance of a respective color.

(57) Independently of an exactly implemented colorimetric evaluation, a threshold value may be set respectively for the colorimetrically determined color value(s) and the color value(s) can be compared with the correlated threshold value. In principle, a correlated threshold value can be set respectively for every color value determined by colorimetry and/or evaluation. By comparing a color value with the respectively associated threshold value, the extent of discoloration can then be efficiently determined and assessed and/or numerically analyzed by computer.

(58) In principle, during the course of the colorimetric evaluation, color values can be examined and evaluated by a person, for example by an operator of the device 1, and/or compared with a respective threshold value for example. With a view to obtaining efficient automation of treatment processes, however, it may also be of advantage if these processes are automated using control technology, in other words a comparison of a colorimetrically determined color value with a set and/or stored threshold value for the corresponding color value.

(59) A threshold value and/or threshold values for color values can be and/or are stored in the evaluation device 20 itself, for example using a data processing system. However, the evaluation device 20 may also be connected to a control device 33 by signal transmission, as schematically illustrated in FIG. 1. Threshold value(s) can then also be stored in the control device 33 using a data processing system.

(60) In this connection, however, it may also be that if a set threshold value is exceeded by a color value correlated with this threshold value, an action is implemented or several actions are implemented. For example, it may be expedient if the action is to trigger an alarm. In principle and depending on a respective treatment process, implementation of the method may also be halted for example, by halting the conveyor 11 and/or stopping the intake of treatment fluid to the treatment zone(s), for example. An action can also be initiated manually by an operator of the device.

(61) However, it may also be preferable to initiate an action, for example an alarm or stopping the treatment, on an automated basis and/or using control technology, for example by means of a control device 33, as illustrated in FIG. 1.

(62) In the example of an embodiment of a device 1 illustrated in FIG. 1 on the basis of a pasteurizing apparatus 3, the action might be to make a change to the chemical composition of the treatment fluid 5, for example. In particular, also with a view to preventing water staining of an object 2 or container 4 incorporating aluminum material, the pH value of the aqueous treatment fluid 5 may be adjusted and/or inhibitors added to the treatment fluid 5, in particular phosphonates, and/or water hardness regulators may be added to the treatment fluid 5.

(63) As illustrated in FIG. 1, in order to implement such actions on an automated basis using control technology, the control device 33 may be connected to appropriate co-operating means, such as for example the valves 34 and/or pumps 35 schematically illustrated in FIG. 1 which can be activated by the control system by signal transmission. In this manner, the valves 34 can be opened by the control system and/or the pumps 35 activated by the control system in order to meter and deliver appropriate chemicals to the treatment fluid, for example from chemical tanks 36. Accordingly, the chemical tanks 36 illustrated in FIG. 1 may contain acids and/or bases and/or inhibitors and/or hardness regulators and/or other chemicals, for example.

(64) If the treatment fluid 5 is used repeatedly for treating the objects 2, one action might be to partially or totally replace the treatment fluid 5, in other words at least partially replace it with fresh treatment fluid 5. This action is of particular advantage in the case of methods whereby the treatment fluid 5 of the treatment zone(s) 6 is repeatedly circulated through a circuit.

(65) Alternatively or in addition, however, the action might be to change a conveying speed of the objects 2 through the treatment zone(s) or to halt conveying. Finally, in order to prevent discoloration caused by the treatment of objects incorporating a metal material with a treatment fluid, it may also be expedient if the action is to change an intake temperature of a treatment fluid 5 fed into a treatment zone 6.

(66) The embodiments illustrated as examples represent possible variants and it should be pointed out at this stage that the invention is not specifically limited to the variants specifically illustrated, and instead the individual variants may be used in different combinations with one another and these possible variations lie within the reach of the person skilled in this technical field given the disclosed technical teaching.

(67) The protective scope is defined by the claims. However, reference may be made to the description and drawings with a view to interpreting the claims. Individual features or combinations of features from the different examples of embodiments described and illustrated may also be construed as independent embodiments of the solutions proposed by the invention. The objective underlying the individual solutions proposed by the invention may be found in the description.

(68) All the figures relating to ranges of values in the description should be construed as meaning that they include any and all part-ranges, in which case, for example, the range of 1 to 10 should be understood as including all part-ranges starting from the lower limit of 1 to the upper limit of 10, i.e. all part-ranges starting with a lower limit of 1 or more and ending with an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1 or 5.5 to 10.

(69) For the sake of good order, finally, it should be pointed out that, in order to provide a clearer understanding of the structure, elements are illustrated to a certain extent out of scale and/or on an enlarged scale and/or on a reduced scale.

(70) TABLE-US-00001 List of reference numbers 1 Device 2 Object 3 Pasteurizing apparatus 4 Container 5 Treatment fluid 6 Treatment zone 7 Intake means 8 Pipeline 9 Distributor means 10 External face 11 Conveyor means 12 Transport direction 13 Heating means 14 Cooling means 15 Treatment zone 16 Collection container 17 Control zone 18 Detection device 19 Portion 20 Evaluation device 21 Hot air fan 22 Zone 23 Removal mechanism 24 Conveyor device 25 Test object 26 Means 27 Illuminating device 28 Screening element 29 Light source 30 Detection means 31 Part-image 32 Signal connection 33 Control device 34 Valve 35 Pump 36 Chemical tank