DE102014105794B4 - packing method - Google Patents

Abstract

A packaging method for producing a packaging product (1), in which adhesive is applied to a substrate sheet (3) by means of an adhesive application device (2), wherein the substrate sheet (3) is transported in the product flow direction (R), the position being in the product flow direction (R). lateral substrate sheet edge (4) by means of an edge detecting device (5) is detected and the adhesive applicator (2) in the transverse direction (Q) is displaceably mounted and the position of the adhesive applicator (2) in the transverse direction (Q) by means of a position determining device (7) is determined and the Is-distance (AI) of the lateral substrate sheet edge (4) to the adhesive application device (2) in the transverse direction (Q) is determined and when a predetermined deviation of this actual distance (AI) from a desired distance (AS), the adhesive application device (2 ) is shifted to reduce the difference between actual distance (AI) and target distance (AS).

Description

The invention relates to a packaging method for producing a packaging product. Such packaging methods are already known.

From the US 4795510 A It is known to arrange edge sensors on an application device and to shift the application device transversely to the direction of web travel as a function of the sensor results which detect the position of an uninterrupted material web.

The US 3688735 A discloses to arrange at an adhesive applicator sensors that detect the side edges in the continuous region of a web and to establish a relationship between the detection of these side edges and the adhesive application.

From the US 4447465 A It is known to detect the approaching edge of a package and to carry out an adhesive application in dependence thereon.

The invention has set itself the task of creating a packaging method in which the correct position of a trace of adhesive on a substrate sheet is ensured in a fault-tolerant, robust manner.

This object is achieved by the reproduced in claim 1 packaging method.

In the packaging method according to the invention for producing a packaging product, adhesive is applied to a substrate sheet by means of an adhesive application device. The substrate sheet is transported in the product flow direction. The position of a side edge of the substrate in the product flow direction is detected by means of an edge detection device. The adhesive application device is mounted so as to be displaceable in the transverse direction, preferably by means of an actuator, and the position of the adhesive application device is determined in the transverse direction by means of a position-determining device. The actual distance of the lateral substrate sheet edge to the adhesive application device in the transverse direction is determined and when a predetermined deviation of this actual distance from a desired distance is exceeded, the adhesive application device for reducing the difference between the actual distance and target distance - preferably by means of the actuator - relocated, preferably proceed.

In the context of this document, "transverse direction" refers in particular to an oblique direction to the product flow direction, in particular a direction extending laterally at 90 ° to the product flow direction.

The substrate sheet preferably comprises a piece of substrate obtained by cutting or punching.

The displacement is preferred, for example, with the aid of a controller, made fully automatic.

Advantageously, the determination of the actual distance of the lateral substrate edge of the sheet to the adhesive application device takes place before the start of the adhesive application. The transfer of the adhesive application device preferably also takes place before the start of the adhesive application, so that the adhesive application preferably begins only after proper positioning of the adhesive application device.

Advantageously, the substrate sheet on the transport device, which carries out the transport in the product flow direction, centered centered and the areas on which to apply adhesive are also preferably not positioned. It is conceivable that a so-called trim cut is performed to ensure the position of the lateral substrate sheet edge with high accuracy. Preferably, such a trimming cut is dispensed with in order to save costs. It has been found that such a trimming cut can be dispensed with in the packaging method according to the invention since the position of the lateral substrate sheet edge which changes from substrate sheet to substrate sheet can be tolerated by the displacement of the adhesive application apparatus. Incorrect gluing is avoided and thus the quality costs are reduced.

If the distance to the adhesive applicator is mentioned, then in the context of this document is meant in particular the distance to the adhesive exit point of the adhesive application device, such as the distance to a nozzle of the adhesive applicator.

The adhesive application device is thus displaced, preferably moved, so that the adhesive application always takes place relative to the substrate sheet edge in the correct position, even if the position of the substrate sheet edge varies from product to product.

The packaging method according to the invention avoids the emergence of incorrect positioning of traces of adhesive. Preferably, the adhesive application device is movable only by a few millimeters. It has been shown that such a low mobility is sufficient. Advantage is the Adhesive applicator very quickly moved, the actuator is therefore preferably highly dynamic.

The edge detection device may comprise a matrix or line camera or / and a special edge sensor. A line sensor is also conceivable.

The predetermined deviation can be zero, so that with every deviation, however small, a shift takes place. Preferably, the predetermined deviation comprises a specific tolerance measure, so that a shift takes place only from the point in time when the deviation of the actual distance from the nominal distance exceeds a certain tolerance level. The actuator thus preferably only corrects when a certain tolerance is exceeded.

The adhesive track may be, for example, sheet-like, linear or punctiform and comprise a plurality of juxtaposed adhesive lines.

In one embodiment, no position determination of the adhesive tracks. However, it is conceivable that a quality monitoring takes place, which includes the determination of the position of the adhesive trace. For example, a determination of the correct length, that is about the completeness of the adhesive trace can be done.

The term "packaging product" in the context of this document, inter alia, an empty packaging, but also for example a filled and sealed packaging called.

The actuator may be, for example, an electric linear drive, an electric motor with a corresponding translation or a pneumatic drive. The adhesive application device may for example also be connected to a chain or toothed belt drive, which allows a lateral displacement of the adhesive application device.

The position determining device may include an encoder or a position sensor, such as a distance sensor.

Preferably, the start signal for the gluing is also generated by means of an edge detection device.

Most preferably, the leading edge in the product flow direction is detected and further preferably generated with this detection, the start signal for the gluing. The detection of the leading edge in the product flow direction can be done by the same edge detection device as the detection of the lateral substrate sheet edge or by another edge detection device.

In one embodiment of the method according to the invention, the leading edge runs obliquely and not perpendicular to the product flow direction. In the embodiment in which the start signal for the gluing is generated with the detection of the leading edge in the product flow direction, the generation of the gluing start signal is preferably corrected with an algorithm in such an oblique, not perpendicular to the product flow direction leading edge. For if the start signal is generated by the detection device, then the time must be corrected by an algorithm in a lateral process of the adhesive device. This is not necessary with straight leading edges. Often, adhesive tabs have chamfered edges in the direction of transport so that when the position changes, the start time also shifts. If this is taken into account by the correction with an algorithm, then the absolute position of the adhesive tracks in the product flow direction and in the transverse direction can be kept in close tolerances.

Advantageously, a moving unit is provided, which comprises the adhesive application device and a position-determining device. The adhesive application device and the position-determining device are thus part of a positioning unit in this exemplary embodiment. Advantageously, the trajectory is calibrated in the idle state of the gluing, in which the actuator moves to a starting position, which can also be called "home position", driven by a stop and / or a sensor and / or a mechanical switch and / or a proximity switch is defined. Since pauses occur repeatedly during positioning, this calibration prevents the position of the head, ie the applicator, from being lost. The mechanical switch may be a microswitch.

The invention also relates to a packaging machine. The packaging machine is preferably a so-called inliner machine. This may include the individual units printing unit and / or creasing and slitting machine and / or folding station and / or glue station. Any combinations of individual units are conceivable. The machine can also be just a folding / gluing machine, to which a cut and hatched Faltkistenzuschnitt is fed. The machine can then fold the blank and glue it. The machine may include a creasing station in which grooves are engraved with rotating creases which determine the aspect ratio of the creasing box. The creases of the machine can be used as carrier or creasing form have simple V-profiles. 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.

• 1 eine Draufsicht auf einen Teil einer erfindungsgemäßen Verpackungsmaschine;
• 2 eine Seitenansicht des in 1 gezeigten Teils der Verpackungsmaschine;
• 3 eine Draufsicht auf einen flachliegenden Faltkistenzuschnitt;
• 4 eine perspektivische Darstellung einer aus dem aus in 3 gezeigten Faltkistenzuschnitt gefalteten Faltkiste.

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

• 1 a plan view of a part of a packaging machine according to the invention;
• 2 a side view of the in 1 shown part of the packaging machine;
• 3 a plan view of a flat-lying Faltkistenzuschnitt;
• 4 a perspective view of a from the in 3 folded crate cut folded folding box.

1 shows a part of a substrate sheet 3 which is indicated by the arrow R symbolized product flow direction is transported. It is an adhesive applicator 2 provided an adhesive applicator valve with a nozzle 2a includes. Between the in 1 shown substrate sheet 3 and the adhesive applicator 2 is an edge detection device 5 arranged, which is the position of the side of the substrate sheet edge with respect to the product flow direction 4 detected. In the embodiment shown, this edge detection device detects 5 In addition, the position of the leading edge in the product flow direction 8th , It is conceivable that instead of this another edge detection device is provided for this purpose (not shown in the figures). The adhesive application device 2 is not stationary, but stored in a displaceable manner and can be driven by an actuator 6 be shifted, to be more precise. The direction of travel is indicated by the arrow V in 1 symbolizes. The actuator 6 includes in the embodiment shown an electric motor 6a with a threaded spindle 6b , The threaded spindle 6b engages in the embodiment shown in a complementary threaded opening of the housing of the adhesive application device 2 , It can instead other actuators 6 for shifting the adhesive application device 2 be provided.

The location of the adhesive applicator 2 in the transverse direction Q is using a positioning device 7 determined. From the location of the adhesive applicator 2 and the position of the lateral substrate sheet edge 4 becomes the actual distance AI the lateral substrate sheet edge 4 to the nozzle 2a the adhesive applicator 2 in the transverse direction Q determined. In the in 1 shown embodiment, this actual distance AI currently smaller than desired, ie smaller than the target distance AS between the substrate sheet edge 4 and the desired adhesive application area 18 , When a predetermined deviation of this actual distance is exceeded AI from the target distance AS becomes the adhesive applicator 2 to reduce the difference between the actual distance and the desired distance using the actuator 6 relocated in the in 1 shown embodiment to the right. For this purpose, the actuator 6 controlled by a controller so that it has a suitable rotation of the threaded spindle 6b and thus the appropriate displacement of the adhesive application device 2 causes.

It can be a guide 9 the adhesive applicator 2 be provided, which is formed in the embodiment shown by a narrow angle. Instead, a differently shaped guide may be provided.

In the embodiment shown is by the edge detection device 5 also in the product flow direction R leading edge 8th detected, and with the detection of the start signal for the gluing, ie for the adhesive delivery from the adhesive applicator 2 generated.

The dashed line 19 in 1 shows an embodiment in which the leachable edge 8th in the field of adhesive application device 2 oblique, not perpendicular to the product flow direction R runs. The leading edge 8th So here is later by the edge detection device 5 detected, as with a non-oblique leading edge 8th the case would be. In order to obtain an exact adhesive application also in this case, the generation of the start signal for the gluing is corrected with an algorithm. In the illustrated embodiment, the algorithm shortens the amount of time between detection of the leading edge 8th and start signal of the gluing.

1 also shows that a stop 11 is provided to the track unit 10 containing the adhesive applicator 2 and the position determining device 7 includes to calibrate the gluing at rest. For this purpose, the actuator 6 moved to a starting position in which the adhesive application device 2 at the stop 11 is present in 1 So left.

The 1 and 2 show the state just before the leading edge 8th of the substrate sheet 3 from the edge detection device 5 recorded and the start signal for the gluing with the appropriate delay, which corresponds to the time that the substrate sheet 3 needed to get off the edge detection device 5 to the adhesive applicator 2 being transported is generated.

3 shows a flat folding crate cut 12 , 4 shows one side of the adhesive flap 15 . 15 ' glued together folding box. In the creasing station grooves were made with rotating creases 13 impressed, which determine the aspect ratio of the folding box 17 (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 machine according to the invention comprises in the embodiment shown a slit unit. In this narrow recesses, so slits 14 cut out or punched out in the extension of the crease lines 13 lie. In this way, the bottom and top flaps of the later folding box 17 cut free. 3 also shows that the glue trace in the embodiment shown comprises three juxtaposed lines of adhesive applied to glue flaps 15 . 15 ' are arranged. In the 3 adhesive flap shown on the right 15 ' This is not a tab in a narrower sense, but an area of the substrate sheet 3 , which is then connected to another portion of the substrate sheet (such as a tab in the strict sense).

LIST OF REFERENCE NUMBERS

1

packaging product

2

Adhesive applicator

2a

Exit point (eg nozzle)

3

substrate sheet

4

lateral substrate edge of the sheet

5

Edge detection device

6

actuator

6a

engine

6b

screw

7

Positioning device

8th

leading edge

9

guide

10

traversing

11

attack

12

flat folded crate cut

13

groove

14

slot

15, 15 '

adhesive flap

16

-

17

folding box

18

desired adhesive application area

19

dashed line

R

Product flow direction

Q

transversely

AI

Actual distance

AS

Target distance

V

arrow

Claims (4)

A packaging method for producing a packaging product (1), in which adhesive is applied to a substrate sheet (3) by means of an adhesive application device (2), wherein the substrate sheet (3) is transported in the product flow direction (R), the position being in the product flow direction (R). lateral substrate sheet edge (4) by means of an edge detecting device (5) is detected and the adhesive applicator (2) in the transverse direction (Q) is displaceably mounted and the position of the adhesive applicator (2) in the transverse direction (Q) by means of a position determining device (7) is determined and the Is-distance (AI) of the lateral substrate sheet edge (4) to the adhesive application device (2) in the transverse direction (Q) is determined and when a predetermined deviation of this actual distance (AI) from a desired distance (AS), the adhesive application device (2 ) is shifted to reduce the difference between actual distance (AI) and target distance (AS). Method according to Claim 1 , characterized in that the position of the leading edge in the product flow direction (R) edge (8) is detected and with the detection of the start signal for the gluing is generated. Method according to Claim 2 , characterized in that the leading edge (8) obliquely, not perpendicular, to the product flow direction (R) and the generation of the start signal for the gluing is corrected by an algorithm. Method according to one of Claims 1 to 3 , characterized in that an actuator (6) for relocating the adhesive application device (2) is provided and a traversing unit (10) is provided, which comprises the adhesive application device (2) and a position determining device (7) and the moving part (10) in the resting state of Calibration is calibrated by the actuator (6) moves to a home position by a stop (11) and / or a sensor and / or a mechanical switch and / or a proximity switch is defined.

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