DE102014105789A1 - Packaging process with quality control and packaging machine - Google Patents

Abstract

Packaging method with quality control, in which the position of an adhesive trace (2) arranged on a substrate sheet (1) relative to the substrate sheet (1) is determined, wherein an image of the substrate sheet (1) loaded with the adhesive trace (2) is detected by a camera (3 ) and a single image acquisition of a multiple, in particular two times threshold value analysis is subjected, wherein the actual position of the adhesive trace (2) relative to a significant feature (4) of the substrate sheet (1) is compared with a desired position.

Description

The invention relates to a packaging method with quality control. Such packaging methods are already known.

A disadvantage of known packaging methods with quality control is that the quality control does not work reliably and error-free under all circumstances.

The invention has set itself the task of creating a packaging method with a quality control and a packaging machine in which usual production fluctuations do not lead to a mistake. Wrong faulty detections should be largely avoided. Quality control should be applicable to many different packaging processes, even at high speeds.

This object is solved by the packaging method recited in claim 1, 5 or 6 and the packaging machine recited in claim 10.

In the packaging method according to the invention with quality monitoring, the position of a fluid medium applied to a substrate sheet, in particular an adhesive trace, is determined relative to the substrate sheet. For this purpose, an image of the substrate sheet loaded with the medium is taken by a camera. Preferably, at least one image is taken per substrate sheet, most preferably exactly one image. The substrate sheet is preferably a piece of substrate obtained, for example, by cutting or punching.

The applied fluid medium is referred to in the context of this publication as a medium order, this is preferably an adhesive trace.

A single image acquisition is subjected to a multiple, in particular double threshold value analysis. The actual position of the medium application relative to a significant feature of the substrate sheet is compared with a desired position.

It is conceivable that the comparison, for example random sampling, at least made by an operator. Preferably, the comparison is fully automatic.

In the event of a deviation (or a deviation exceeding a preselected tolerance) of the actual position of the medium application relative to a significant feature of the substrate sheet from the desired position, an action is preferably performed. In principle, it is conceivable that this action is initiated or made by an operator, preferably it is fully automatic.

In this way it can be ensured, for example, that a prescribed minimum distance of the medium application to a substrate sheet edge, for example a glue flap contour, or / and an internal groove, is not undershot.

The medium application, such as the adhesive trace, may be approximately planar, linear or punctiform. In the context of this document, the term "adhesive trace" also denotes an adhesive application which comprises several points or lines next to one another.

The substrate sheet may comprise, for example, paper, kraft paper, corrugated cardboard or solid board, or may be formed from one or more of these materials.

In the context of this document, the term "blank" refers in particular to a flat substrate sheet. "Blanks" are referred to in this document as "benefits".

At least, therefore, there is also a position determination of the medium application and not merely a determination of the correct length of a medium application. Preferably, by the method according to the invention, in addition to the possible determination of the presence and completeness of the medium application, its position relative to a significant feature of the substrate sheet, such as a product edge, should be determined.

If the position of the medium application is not correct, this can lead to an increased rejection or machine contamination, which is associated with a high cleaning effort. If, for example, the adhesive track is applied outside the substrate sheet, then the adhesive can splash into the machine and lead to an increased cleaning effort. In addition, the adhesive can then be absorbed by subsequent products in this case, which can lead to sticking in a shingled transport or in a stacking device. Also, such traces of adhesive, especially on the outside of folding boxes, often also visually disturbing.

If, for example, adhesive is applied to an internal groove or beyond, so-called internal bonding occurs. For example, folding boxes are often transported flat and stored after folding and assembling. If there are traces of adhesive on the inside, they can stick together. About the Faltkiste can no longer be erected in this case and is therefore useless (ie committee). Since nowadays almost exclusively packing machines are used, these stop and the error must be eliminated. In the case of frequent problems with automatic packaging machines, entire productions are often returned by the packer to the packaging manufacturer for re-sorting. This means great economic damage for the packaging manufacturer. At best, only parts of the bonded cover paper are torn out on the inside, which is also not acceptable for optical reasons.

The camera is preferably a digital camera. The camera can be a line scan camera. The camera can be a matrix camera.

In the context of this publication, the term "packaging process" refers in particular to a process for producing a packaging but also to the process of packaging a product itself, that is to say filling and closing the packaging.

The packaging method may include, for example, forming or closing crates or cartons. The invention is thus equally applicable, for example, to cartons and folding boxes.

In the embodiment in which the packaging process involves forming or closing cartons, they may be punched out of a flat substrate by means of a die and then adhesively bonded at defined locations in a folder gluer, formed into a box, and joined. Grooving tools can be introduced in the punching die, which form a score line in the substrate sheet. Around this score line, the substrate sheet can be folded in further processing. Creasing lines serve to facilitate the folding process and prevent the blank from kinking at places not provided.

The packaging process can be carried out by means of a folder gluer, for the production of folding boxes from blanks. The folder gluer may include a folder and gluing station for folding and gluing the blanks. The blanks can be printed and also be provided with handles, sight holes or the like, which may have been previously introduced by means of punching units in the blanks.

The blanks are preferably centered on a conveyor. Any further positioning of the adhesive flap or the adhesive flaps or of other outer regions of the blank, which are exposed to fluid medium, preferably does not take place. The adhesive flaps or other outer regions therefore shift from blank to blank as a function of manufacturing tolerances, in particular laterally to the transport direction.

The packaging process may include manufacturing or closing a package (especially carton or folding box) from substrate sheets comprising one or more layers of corrugated board. However, the invention can also readily be applied to the production of packaging or the closing of a packaging based on cartonboard or solid board. The method according to the invention is therefore not limited to the production of folding boxes made of corrugated cardboard, but can at any time, for example, be transferred to other areas of packaging production, for example in folding box gluing machines.

Advantageously, the application of a fluid medium, preferably traces of adhesive, to a moving relative to the fluid outlet Good, in particular a tab of a substrate sheet, such as a corrugated board cut, which is referred to in the context of this document as "Laschenbeleimung". Thus, adhesive used to seal the package may be applied through an exit opening on the substrate sheet blank. The Laschenbeleimung can be done as a process step in the production of corrugated boxes, which are referred to in this document as folding boxes. The tab gluing can be done in systems that can also be called "inliner" or "flexo folder gluer". The step of medium application can be automated, so that it is at least largely without intervention of operating personnel. It is possible to realize the invention in connection with a variety of application methods or applicators for applying a fluid medium. It can be provided glue application nozzles, each having at least one glue outlet opening, which may be predominantly in contact with the substrate sheet, such as the corrugated cardboard blank. Depending on the direction of folding of the installation and the type of packaging, for example corrugated box, the glue application can take place from above or below, on the operating side or the drive side of the installation, depending on whether adhesive is applied to an inner flap or an outer flap, for example. In another embodiment of the method, the media application takes place without contact, d. H. the applicator, such as the nozzle opening, is spaced from the substrate sheet surface. In the context of this document, the term "adhesive application device" refers in particular to devices which are in contact with the substrate sheet during the application of the adhesive or which operate in a contactless manner.

The term "adhesive gluing" in the context of this document in a wide use of this term also refers to an application of adhesive to the region of the substrate sheet, which is then connected to the adhesive flap.

Preferably, an image of the medium application is detected with a line or matrix camera, which is then evaluated. The medium application preferably has a different brightness than the substrate sheet. The fluid medium may, for example, be darker in color than the substrate sheet or be designed to be fluorescent. The better the contrast of the medium application to the substrate sheet background, the more secure the medium application is detected. This contrasting is often difficult, as unmodified adhesive often shows milky white. When applied to a white board, detection is often difficult due to low or no contrast.

In one embodiment, dye, such as blue or red, is added to the medium, such as the adhesive, thereby increasing the contrast to the substrate sheet background. In another embodiment, substrate sheets (such as papers) are used which have a high waste paper component. These can appear greyish and have dark Einsprenkelungen.

By subjecting a single image acquisition to a multiple, in particular double threshold value analysis, it is achieved that the advantage of the threshold value method, namely a very robust recognition of the medium application, is achieved and, unlike a merely simple threshold value analysis, the substrate sheet background is not hidden, but rather a determination of the position of the substrate sheet and thus ultimately a determination of the position of the medium application is possible relative to the substrate sheet.

The at least one first threshold value analysis can be carried out before or after the at least one second threshold value analysis.

In one embodiment of the method according to the invention fluid medium is applied to colored or printed substrate sheet areas, such as adhesive tabs. In this embodiment, a challenge is that the evaluation algorithm may mistakenly misinterpret image components or coloring as a medium application. Preferably, in this embodiment, the fluid medium, such as adhesive, UV-fluorescent substances are added and the medium order is further preferably illuminated in the image recording with UV radiation. The fluorescence may be yellow, red or blue under UV illumination. Depending on the substrate sheets of the reason preferred thereby different shades used to enhance contrast.

In one embodiment, UV LEDs are used for illumination lines.

In one embodiment of the method according to the invention, the blanks are centered approximately in a folder gluer or inliners. It is therefore extremely important to keep the blank format within narrow limits, since the medium application is usually applied to one of the lateral outer edges of the blank. However, the location of the side-mounted areas of the blank would change with the size of the blank. In particular, in a conceivable embodiment, in which the medium application device is firmly integrated in the machine, there may be a change in the position of the medium application relative to the substrate sheet contours.

In one embodiment, a blank is made on the corrugator machine, which is subject to certain manufacturing tolerances, relatively large tolerances. In this embodiment, another trimming cut is preferably carried out, which determines the exact format of the format cut. Depending on the format size, this trim cut preferably removes about 1 to 2% of the material, which represents a high cost factor for a production cost share of the packaging material of up to 75% on the end product price.

In another embodiment, the method according to the invention has no trimming cut. It has been shown that it is possible to dispense with this trimming cut. As a result, besides the costs for separated packaging material, setup costs are saved and costs that result from the regular maintenance of the trimming blades and their replacement.

Position deviations of medium application relative to a significant feature of the blank are preferably determined. In this way - in particular due to the lack of trimming cut - incorrectly glued products are recognized and thus the so-called quality costs are avoided, which arise from the fact that faulty packaging are delivered, associated with a corresponding annoyance and packaging problems on the customer side by defective products already in production can be identified.

Advantageously, the image acquisition comprises at least the region of the medium application and a significant feature of the substrate sheet. The significant feature of the substrate sheet is preferably optically identifiable.

The significant feature of the substrate sheet is also referred to below as a significant feature and preferably comprises a substrate sheet edge, such as an adhesive flap contour. Instead of or additionally, it may also comprise a punching of the substrate sheet, a printed image edge of the substrate sheet, printed marks printed on the substrate sheet, a crease line of the substrate sheet, such as an internal groove or the like.

The terms "threshold image" and "result image" are used interchangeably within the context of this document.

In the case of at least one first threshold value analysis, the threshold value is preferably selected such that (in particular in the result image of this threshold value analysis) the significant feature is visible and the medium application is not visible or only to a small extent.

In the case of at least one second threshold value analysis, the threshold value is preferably selected so that the medium application (in particular in the result image of this threshold value analysis) forms a strong contrast to the substrate of the substrate sheet and the significant feature completely or largely disappears.

Advantageously, a threshold image is created as the result of each threshold analysis. It is conceivable that a single, several or all threshold value images exist only as a data set and are not displayed in human-perceivable image form. "Visibility" then means "detectability". However, exactly one, several or all result images are preferably perceptible to humans.

The position of the significant feature is preferably detected from the at least one first threshold image.

From the at least one second threshold image, the position of the medium application is preferably detected.

The relative position of the medium application to the significant feature is then preferably determined from the at least one first and the at least one second threshold image.

It is conceivable that more than two threshold value analyzes are carried out per output image. Preferably, exactly one first threshold value analysis and exactly one second threshold value analysis are performed per image and therefore exactly one first threshold image and exactly one second threshold image are formed.

All threshold images of a substrate sheet preferably spatially capture the same detection area.

In other words, each output image, that is to say the image taken by the camera of the substrate sheet applied with the medium, for example the adhesive trace, is preferably segmented at least twice by the threshold value method and at least two result images are calculated for at least two different threshold values. Preferably, the result images are binary images. Thus, exactly two segments are preferably formed per threshold value analysis, preferably the respectively sought object (that is to say, for example, the glue trace or the significant feature) and the respective background.

In the result images, each pixel whose characteristic, by means of which the threshold value analysis takes place, that is to say by comparing it with a threshold, the membership of a pixel to a segment is smaller than the threshold value, can be colored black and each pixel whose characteristic is above the Threshold, white.

Advantageously, the threshold is formed fully automatically. It is also conceivable that the thresholding takes place manually, ie a manual selection of the threshold values by the operator is undertaken. However, machines of packaging manufacturing generally work for operators who have not received any special image processing training. With a manual selection of the threshold values there is therefore always the risk of a misinterpretation or incorrect input.

In the preferred embodiment, in which the threshold value formation takes place fully automatically, a product charged with fluid medium is preferably moved into the detection range of the camera and the image acquisition is carried out with different threshold values. In an automatic algorithm, it is then preferable to determine the thresholds that best filter out the significant feature and the medium application. For example, the threshold at which a product edge appears for the first time and the threshold at which the product edge disappears are determined. The threshold value for the image analysis is then automatically preferably placed in the middle in order to counteract influences of the production management, eg. B. fluttering of the blank or lighting changes to be protected. Preferably, analogously also proceeded to determine the threshold for the detection of medium order.

The step of thresholding the medium order detection threshold may be before, or after, the step of thresholding the product edge detection threshold.

In the preferred embodiment, in which the threshold is formed fully automatically, this is done so preferably by the determination of the threshold value for the detection of media order is done by software in a first step, preferably by measuring from when and until when the media order is recognizable and the threshold is then formed, for example, by averaging.

In a second method step, the determination of the threshold value for identifying the significant feature is preferably carried out, preferably by measuring from when and until when the significant feature is recognizable and the threshold value formation then takes place, for example, again by averaging, wherein the first method step before or after second process step can be performed.

Advantageously, a high contrast is produced between the medium application and the substrate sheet.

Preferably, further filtering is performed, such as outlier filters, with the help of elements such. B. spots or adhesive splashes that do not exceed a certain size or size dimension, are ignored. The evaluation algorithm can therefore be supplemented by further filtering. Such outlier filters make the entire evaluation algorithm even more robust.

Independent inventive meaning comes to a packaging method for quality control, in particular according to one of claims 1 to 4, in which a liquid applied to a substrate sheet fluid medium is illuminated with an RGB light source and the amount of emanating from this light source red, green and blue light is optimized that results in a great contrast between media application and substrate sheet. The colored lighting plays a major role in producing a large contrast between the medium application and the substrate sheet. It may be, for example, that with a blue illumination, only a low contrast between the medium application and the substrate sheet can be determined, while with a red illumination the contrast is very high and thus permits a good differentiation. The packaging method according to the invention is preferably carried out with the aid of a controller. This influence can be taken into account by taking several pictures in quick succession with different illumination settings of the RGB illumination, wherein the colors of the illumination are preferably switched through sequentially, in particular in a chronological order, preferably by the controller. The illumination preferably comprises RGB LEDs and, in this embodiment, the RGB LEDs are preferably switched through sequentially by the controller. The switching can also be done only if necessary. For example, the operator may choose a "best choice" lighting setting and perform other lighting variations only when needed. The switching of the RGB lighting can also be done automatically.

The following packaging method with quality control also has independent inventive significance: in this packaging method with quality control, in particular according to one of claims 1 to 5, a fluid medium applied to a substrate sheet, for example an adhesive trace both with a UV light source and with a light source , which emits visible light for humans, illuminates. In the case of UV illumination (in connection with UV-fluorescent media, such as adhesives), it should be noted that in the case of pure UV illumination, a suitable threshold value, depending on the nature of the substrate sheet, can often not or only insufficiently be achieved. Preferably, the UV illumination using multiple LEDs, such as in lighting rows. Advantageously, individual LEDs in the or the LED lighting rows, z. B. every fourth, replaced or formed by an LED that emits a visible light this can, for. B. be white or colored LEDs.

Advantageously, an operating screen is provided, which shows the image taken by the camera of the acted upon with the fluid medium substrate sheet. The screen therefore preferably shows the output image. If the operator on this control screen in this image marks the areas of the medium application and the significant feature (s), preferably each by dragging exactly one frame around those areas, then the recognition algorithm can be speeded up. The operation screen preferably includes a touch screen. The marking can also be done in other ways instead of dragging frames. The threshold value formation in this case preferably does not take into account the entire image, but preferably only in the marked areas. In this way, the evaluation algorithms can run faster.

In the feature by means of which the threshold value analysis takes place, that is to say the comparison of which with a threshold value determines the affiliation of a pixel to a segment, this can be the gray value of a pixel, ie its pure brightness value, in which further color information is not taken into account becomes. Also in the embodiment with RGB light source illumination, can be turned off on this feature. In particular, in the embodiment with an RGB illumination, it is conceivable that color information is taken into account instead of or in addition to the gray value of the pixel. In this embodiment, it is conceivable that the consideration of the color information is changed manually or automatically in synchronism with the change in the color composition of the illumination.

In the exemplary embodiment in which the gray value of a pixel is selected as a feature with whose aid the threshold value analysis is performed, measures are preferably taken that the gray areas of the pixels of the output image areas medium application, substrate sheet and background do not overlap or barely overlap. For example, a background may be selected that is consistently darker than the substrate sheet and a fluid medium whose tracks are consistently lighter than the substrate sheet. In embodiments in which other features, such as color, are selected, it is preferred to take measures such that the colors of the pixels of these areas do not overlap or barely overlap.

In addition to determining the position of a medium application arranged on a substrate sheet, it is advantageous to perform a check for completeness of the medium application relative to the substrate sheet.

The action may include ejecting a product identified as defective or marking it. Advantageously, therefore, the package is discharged when a tolerance is exceeded or marked with a marking device. The marking device may be a spray valve. Advantageously, a removal takes place so shortly after image acquisition that only a few milliseconds are available for image acquisition and image evaluation, ie image analysis. Because there must also be the time for the carryover, so the tracking of the product through the machine to the place of removal and for controlling the Ausschleuseeinrichtung (such as ejector) are available.

It is also conceivable that when the tolerance is exceeded, a signal, for example by means of a signal lamp, takes place.

In addition to the check for completeness of the medium application, the robust position evaluation then preferably takes place during production to a significant feature of the substrate sheet. If the position deviates from the desired specification over a predetermined tolerance measure, then a bad signal is generated or, in the case of a fail-safe principle (ie a principle in which all incoming products to be tested are declared defective, until the product is recognized as good the product was not rated as good. Due to the error signal, the product can then be discharged with an ejector or marked with a marking device.

The lighting can be used to increase the contrast and shorten the exposure times. Preferably, the receiving area, ie the detection area of the camera is illuminated with a lighting device. Preferably, a lighting is used for this purpose (for example lines with RGB LEDs), in which individual colors can be activated separately and several colors can be combined. By such a skillful choice of lighting, the contrast of the medium order can be increased to the substrate sheet background. By such a clever choice of lighting can also be achieved that the colors of the pixels of the output image areas medium order, substrate sheet and background do not or hardly overlap.

The invention relates in its device aspect a packaging machine for carrying out a packaging method according to one of claims 1 to 9. Advantageously, the packaging machine comprises an inliner machine. This preferably comprises a juxtaposition or integration of the individual units printing unit and / or creasing and / or slitting machine and / or folding station and / or glue station. The packaging machine according to the invention can thus comprise any desired combinations of individual units and, for example, also be only a folding / gluing machine, to which a cut and cut folding box cut is fed. Advantageously, the machine then folds this blank and glued to it.

The packaging machine may comprise a folding box gluer for producing folding cartons from blanks and may comprise the following processing stations: a depositor who pulls the blanks from a stack one after the other at high speed and feeds them individually to the subsequent processing stations, a folding station in which the one Adhesive strips provided blank parts for the production of an adhesive bond folded over by 180 °, so be folded, a Überleitstation, the folded, provided with not yet set adhesive seams blanks in all parts exactly aligned with the subsequent collecting and pressing device supplies and a collecting and pressing device in which initially a shingled stream of folded blanks is formed, which can then be held between press belts for some time under pressure, so that the adhesive seams set. Depending on the type of box to be produced, the folder gluer may contain additional processing stations. For example, one or more criminals, in which folding flaps are folded back and forth, so that the corresponding longitudinal grooves are made soft and smooth by bending by 180 ° and more folding stations to perform additional folding. At the beginning of a folding station, a commissioned work for adhesive can be arranged, which can apply one or more traces of adhesive to the folding flaps to be bonded, which are also referred to as adhesive flaps in the context of this document.

The packaging machine may include a machine for forming or closing folding boxes, preferably an in-line machine. The folding boxes can be produced in so-called inliners in corrugated board or heavy cardboard production. This resulted from the juxtaposition of the individual aggregates printing unit, creasing and slitting machine, folding station and glue station. Not every one of these individual units must be part of the inliner machine. Any combinations of the method steps of the individual units are conceivable, the packaging machine can also be just a folding / gluing machine, which is supplied to a tailored and ausschitzter Faltkisternuschnitt. The machine can then fold the blank and glue it. The machine can perform the step of scoring. In a scoring station, grooves can be imprinted with rotating scrapers, which determine the aspect ratio of the folding box (length and width). The creases of the machine can have simple V-profiles as a support or creasing shape. You can work against a counter body made of steel, rubber or plastic. In a slit aggregate, narrow recesses (slots) can be cut out or punched out, which lie in the extension of the score lines. In this way, the bottom and top flaps of the later folding box can be cut free.

The invention will now be explained in more detail with reference to the drawings. Show it:

1 an initial image taken by the camera of a substrate sheet applied with an adhesive trace;

2 a schematic representation of the choice of thresholds;

3 a schematic side view of a substrate sheet with arranged above camera;

4 a first threshold image;

5 a second threshold image;

6 a plan view of a flat-lying Faltkistenzuschnitt;

7 a perspective view of a from the in 6 folded crate cut folded folding box.

In the exemplary embodiment shown, the medium application comprises an adhesive trace 2 ,

1 shows one from a camera 3 taken picture one with a trace of adhesive 2 acted substrate sheet 1 , The substrate sheet 1 is shown as a simple rectangle for the sake of simplicity. But it can also be a shape like in 6 shown, have.

In the embodiment shown, the on the substrate sheet 1 applied adhesive trace 2 illuminated with a light source emitting white, visible light. For the glue, the glue trace 2 it is white, milky glue and the substrate sheet 1 In the exemplary embodiment shown, this is corrugated board with a high waste paper constituent that appears greyish and therefore somewhat darker than the adhesive trace 2 , The background 5 is still slightly darker in the embodiment shown, as the substrate sheet 1 ,

In 2 are the areas of brightness that are the pixels of the camera image in the area of the background 5 , the substrate sheet 1 and the glue trace 2 have shown schematically. It can be seen that the gray areas of the pixels of the output image areas adhesive trace, substrate arc and background do not overlap. Because it became a background 5 chosen, which is consistently darker than the substrate sheet 1 and an adhesive whose tracks are consistently lighter than the substrate sheet.

3 schematically shows the arrangement of the camera 3 above the transport in the direction of arrow P substrate sheet 1 , To determine the position of the on the substrate sheet 1 arranged adhesive track 2 relative to the substrate sheet 1 becomes a single camera shot from the substrate sheet 1 performed. This in 1 shown image of the camera is subjected to a double threshold analysis.

For this purpose, at least a first threshold value S1 is selected such that the significant feature 4 , which in the embodiment shown by the substrate sheet edge 4a formed is visible and the trace of adhesive 2 not or only to a small extent, see 4 , Subsequently, in a second threshold value analysis, the threshold value S2 is selected such that the adhesive trace 2 a strong contrast to the substrate sheet 1 (and the background 5 ) and the significant feature 4 completely disappears, see 5 , The checkered hatching in the 4 and 5 symbolizes black here. This in 4 The output image shown was achieved by having all pixels of the in 1 shown gray values smaller than the threshold S1 were colored black and all pixels of the output image with gray values greater than or equal to the threshold S1 were colored white. Because the pixels of the source image, the substrate sheet and the pixels of the source image, indicate the glue trace 2 show a gray value greater than the threshold value S1, both the substrate sheet appears 1 as well as the adhesive trace 2 at the in 4 white. A smaller gray value in this context means that the pixel is darker than a pixel with a larger gray value.

Subsequently, the same output image ( 1 ) subjected to a new threshold value analysis, wherein in this second threshold value analysis, a threshold value S2 has been selected, such that the adhesive trace 2 a strong contrast to the substrate sheet 1 (and the background 5 ). Since both the pixels of the output image ( 1 ) that the background 5 show, as well as the pixels of the output image, the substrate sheet 1 show a gray value which is smaller than the threshold value S2, appear in the resulting result image ( 5 ) both the background 5 , as well as the substrate sheet 1 black and only the glue trace 2 White. In this way, both a result image is created, in which the location of the significant feature 4 is recognizable in a robust manner, as well as a result image, in which the position of the adhesive trace 2 is determined in a robust and error-prone manner. From these two result images, the relative position of the adhesive trace 2 to the significant feature 4 determined.

6 shows here a flat lying Faltkistenzuschnitt. 7 shows one side of the adhesive flap 11 glued together folding box. In the groove station were grooves with rotating groove bodies 9 imprinted the the aspect ratio of the folding box 12 determine (length and width). The groove bodies usually have as embossing or groove shape simple V-profiles. They work preferably against a counter body made of steel, rubber or plastic.

The packaging method according to the invention comprises in the embodiment shown a slit unit. In this narrow recesses, so slits 10 cut out or punched out in the extension of the groove lines 9 lie. In this way, the bottom and top flaps of the later folding box 12 cut free. 6 also shows that the adhesive trace 2 in the embodiment shown comprises three juxtaposed adhesive lines on adhesive tabs 11 . 11' are arranged. In the 6 adhesive flap shown on the right 11' This is not a tab in a narrower sense, but an area of the substrate sheet 1 , which is then connected to another portion of the substrate sheet (such as a tab in the strict sense).

LIST OF REFERENCE NUMBERS

1

 substrate sheet

2

 adhesive track

3

 camera

4

 significant feature

4a

 Substrate sheet edge

5

 background

6

 first threshold image

7

 second threshold image

8th

 flat folded crate cut

9

 grooves

10

 slots

11, 11'

 adhesive flap

12

 folding box

F

 medium application

S1, S2

 thresholds

P

 arrow

Claims (10)

Packaging method with quality control, in which the position of a substrate sheet ( 1 ) applied fluid medium, in particular an adhesive trace ( 2 ), relative to the substrate sheet ( 1 ), wherein an image of the substrate sheet loaded with the fluid medium ( 1 ) from a camera ( 3 ) and a single image acquisition is subjected to a multiple, in particular double, threshold value analysis, the actual position of the medium application (F) being relative to a significant feature ( 4 ) of the substrate sheet ( 1 ) is compared with a desired position. Method according to Claim 1, characterized in that, in the case of at least one first threshold value analysis, the threshold value (S1) is selected such that the significant characteristic ( 4 ) of the substrate sheet ( 1 ) is visible and the medium application (F) is not or only slightly visible, wherein at least a second threshold value analysis of the threshold (S2) is selected so that the medium application (F) is a strong contrast to the Substrate of the substrate sheet ( 1 ) and the significant feature ( 4 ) completely or largely disappears, wherein from the at least one first threshold image ( 6 ) the location of the significant feature ( 4 ) and from the at least one second threshold image ( 7 ) the position of the medium application (F) is detected and from the at least one first and the at least one second threshold image ( 6 . 7 ) then the relative position of the medium application (F) to the significant feature ( 4 ) is determined. Method according to claim 1 or 2, characterized in that the threshold value formation takes place fully automatically, by determining the threshold value for the recognition of the medium order (F) by software in a method step by measuring from when and until when the medium order (F) is recognizable and the threshold value is then formed, for example, by averaging, and in another method step, the determination of the threshold value for the detection of the significant feature ( 4 ) is measured by measuring from when and until when the significant characteristic ( 4 ) is recognizable and the threshold is then formed, for example, by averaging. Method according to one of claims 1 to 3, characterized in that further filtering is provided, such as outlier filter, by the elements, for. B. spots or adhesive splashes that do not exceed a certain size dimension, are ignored. Packaging method with quality monitoring in particular according to one of claims 1 to 4, characterized in that a substrate sheet ( 1 ) is illuminated with an RGB light source and the amount of red, green and blue light is optimized such that a large contrast between medium application (F) and substrate of the substrate sheet ( 1 ). Packaging method with quality monitoring in particular according to one of claims 1 to 5, characterized in that a substrate sheet ( 1 ) is illuminated both with a UV light source and with a light source that emits visible light to the human. A method according to any one of claims 1 to 6, characterized in that an operator at a control screen of an image receiving the material to be examined range, the regions of the contract medium (F) and of the or of the significant features ( 4 ), by dragging a frame around these areas. Method according to one of claims 1 to 7, characterized in that in addition to the position determination of a substrate sheet ( 1 ) arranged medium application (F) relative to the substrate sheet ( 1 ) also a check for completeness of the medium order (F). Method according to one of claims 1 to 8, characterized in that in the case of a deviation of the actual position of the medium application (F) relative to the significant feature ( 4 ) of the desired position, which exceeds a preselected tolerance of the substrate sheet ( 1 ) is ejected or marked. Packaging machine for carrying out a packaging method according to one of claims 1 to 9.

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