EP1136369B1 - Carton blank and a device for generating a fold line on the blank - Google Patents

Abstract

The packaging comprises a grooved line (2) for preparation of a bending line, at a regular distance from the length, and has a changing width. The grooved line is formed in the shape of a rhombus line and has sinus waves (2,3). A stamp works at a regular distance fro the edge and is in the form of a channel.

Description

The invention relates to a packaging blank made of corrugated cardboard with at least one creasing line to prepare a bending line in the cut, and a device for attaching a creasing line to the packaging blank.

Packaging blanks are made in one or more punching processes manufactured. The material is cut along cutting lines using a Punching knife punched out and thus cut. Are on the punch generally built up multiple uses of the same or different parts. Different lines in the punching tool can make different Results of the punching process can be achieved. So in addition to cutting lines scoring lines, scoring lines or perforations can also be applied.

The at the same time or in a separate step with the cutting lines in The material of the crease lines is used to prepare a bending point in the blank. To produce a creasing line, the material is made by one Stamp a punching tool (also called die) into one on one Punching plate applied counterpressure pressed so that the material on this point is condensed. The creasing lines facilitate the later bending of the Material. The depth and width of the grooves vary according to the respective Material and processing parameters.

In the case of wave types with a larger wave height, when bending the Packaging blank on the inside displaces a large amount of material while the material is stretched on the outside. Therefore as wide as possible crease lines are used, the bending with the largest possible Allow bending radii.

Both the scoring across the wave crests and the corresponding one The aim of the process along the wave crests is to prepare for folding Bending resistance at the folded edges so clear compared to the environment reduce that the bending line is adhered to exactly. To prevent, that the corrugated cardboard tears due to the groove stress crease lines as wide as possible. When processing on automatic glue machines or by hand, however, there are often folding and adhesive tolerances. With the as "Fishtail" errors are two pages to be moved in the Automatic glue machine moved in one direction so that two colliding Cutting edges are impermissibly close together on one side while on a gap is created on the opposite side. In the case of the "misalignment" are the cut edges to be glued together in height to each other added. Both of these errors result from bending the blanks along of bending lines that are not exactly parallel to those to be glued together Are cut edges.

In the case of the error known as a gap or GAP, they are mutually exclusive adhesive cutting edges either too far apart or they are too close together so that they overlap. This error occurs especially when the crease lines in the blank are particularly large are trained, which is often desired for the reasons just described becomes. In practice, therefore, there is a compromise between too broad and too narrow crease lines searched.

From DE 196 19 496 A1 it is known to cut into corrugated cardboard by means of a female embossing element and a folding knife bring in, in which perpendicular to the longitudinal direction of the folds in Cross channels extend at regular intervals. This is intended to fold the Corrugated cardboard will be easier if the fold is parallel to the waves of the Cuts. Because the width of the fold is essentially over its entire length Length is short, tensions occur when the blank is folded over, through which the cutting can be damaged.

EP 0 563 781 A1 describes a method for introducing an area incised line described in a flat plastic material. For this becomes a line in the material through punching and cutting tools trained, the width of which changes at regular intervals. The edge this line is rectangular.

The object of the present invention is now to produce a packaging blank type mentioned and a device for attaching a creasing line to create the packaging blank where the crease line is both a largely pressure-free as well as defined folding of the blank allows.

This technical problem is solved according to the invention in that the Creasing line or the stamp and the counter direction on the punching plate in at regular intervals a width that changes along its length exhibit. The stamp of the punching device and the corresponding counter-direction formed rhomboid, whereby the Creasing line shape is a diamond line. Which are periodically in the Alternatively, the width-changing creasing line can also be sinusoidal change or have another shape that only changes in length along its length Regarding their width must change periodically, being sufficient Number of areas with a smaller width and areas with a larger width along the crease line must be present in order to achieve a defined positive bend to enable.

So that we can create a creasing line with a special shape using a punching device attached to a packaging blank, the width of which is so in some areas The big thing is that enough material is displaced for easy bending can, but which becomes so narrow at regular intervals that at its Connection line is a defined forced bend. With that Angular inaccuracies when bending are largely excluded.

According to the invention, the device for forming a creasing line on the Packaging blank, which is usually a punching device acts, designed so that both the stamp of the punching device and the counterpart adapted to its shape is along its length have a changing width at regular intervals. In that the width of the creasing line is changed periodically along its length ensures that creasing line areas with large Width are available for a good material displacement when twisting and that at corresponding intervals crease line areas with a small Width to ensure high dimensional accuracy when bending available. The exact alignment of the bending line is determined by the defined narrow areas of the crease line, with the bend line in the wide Areas of the creasing line between the narrow lines serving as support points Areas runs in a straight line. This way, without increasing the Manufacturing effort and without influencing the cycle times a significant improvement in dimensional accuracy when applying bending lines become.

The invention is described below using exemplary embodiments and below Reference to the drawing explained in more detail.

Fig. 1

eine stark vergrößerte Ansicht von oben auf eine kaschierte Wellpappe mit einer Ausführungsform einer erfindungsgemäßen Rilllinie,

Fig. 2

in einer Prinzipdarstellung eine Seitenansicht einer Stanzeinrichtung zur Verwendung mit der vorliegenden Erfindung und

Fig. 3

eine perspektivische Ansicht einer erfindungsgemäßen Vorrichtung zur Anbringung einer Rilllinie an einem Verpackungszuschnitt.

Show it:

Fig. 1

2 shows a greatly enlarged top view of a laminated corrugated cardboard with an embodiment of a creasing line according to the invention,

Fig. 2

in a schematic representation a side view of a punching device for use with the present invention and

Fig. 3

a perspective view of a device according to the invention for attaching a creasing line to a packaging blank.

To minimize the folding and gluing tolerances when processing a Corrugated cardboard 1 shown in FIG. 1 for packaging has the crease line 2 in FIG regular sections have a width that changes along their length. The edges of the crease line 2 shown in FIG. 1 are in the form of two opposing directions Sine waves 3 and 4 are formed. The scoring line shows 2 areas larger Width 5 and for a defined forced bend in regular sections narrow areas 6. The crease line 2 runs either across or parallel to shaft 7 of corrugated cardboard 1.

In Fig. 2 a punching device 8 is shown in the form of a flat board punch, the a punch 9 (also called die) and a punch plate 10 (also Called stamped sheet). The punch 9 consists of a multilayer stable wooden plate 11, in which several benefits are provided. For the attachment of cutting lines in the corrugated cardboard 1 in slots 12 in the punch 9 punch 13 arranged. The slots 12 for the Lines in the material are sawn with a scroll saw or through Laser cutting creates. Sponge rubber strips are made along the cutting lines 14 glued to push the material out of the mold after the punching process.

The creasing is carried out by means of a tool in the punch 9 Stamp 15 against an applied to the punch plate 10, in particular glued-on counter device 16. This consists of a phenoplastic laminate with paper as a resin base. In the opposite direction 16 is a channel 17 designed to receive the stamp 15. The counter 16 serves to improve the quality and accuracy of the creasing. Now becomes one Corrugated cardboard 1 between the stamp 15 and the counter device 16, a creasing line 2 is formed along the channel 17 in the corrugated cardboard 1, when the punch 15 is pressed in the counter direction 16.

The device shown in FIG. 3 for attaching a creasing line 2 a packaging blank consists of the stamp 15 and the Counter-direction 16. The stamp 15 points to the counter-direction 16 facing side several areas of greater width 5 and in between narrow areas 6. Accordingly, it also widens and narrows the channel 17 of the counter 16. The stamp 15 and the counter 16 are arranged relative to each other so that the areas of great width 5 of the stamp 15 the areas of wide width 18 of the channel 17 in the opposite direction 16 face each other. The same applies to the narrow areas 6 of the stamp 15 and the narrow areas 19 of the counter device 16.

Due to the design of the stamp 15 and the channel 17 in the Counter direction 16 also has the creasing line 2 along its length in width changing at regular intervals. As in FIG. 2 shown, be rhomboidal or any other, for example. Sinusoidal (Fig. 1) or angular shape.

Since, as explained in connection with FIG. 2, the punching device 8 additionally to punch 15 and counter 16 also include punch 13 can, with which the corrugated cardboard can be cut, the Packaging blank 1 both cut in one step as well as be provided with creasing lines.

A packaging blank provided with the crease lines described above can be used with high dimensional accuracy both on automatic glue machines and on Fold your hand, since the narrow areas 6 and 19 of the crease line 2 define one Allow bending of the bending lines of the packaging in a narrow area. At the same time, the flipping of sections of the Packaging cut along the crease line 2 through the wide areas 5 and 18 relieved, since this is a good material displacement when bending enable.

Claims (4)

1. Carton blank of corrugated cardboard or card having at least one score line for preparing a fold line in the blank, the score line having a width that changes at regular intervals along its length, characterised in that the score line (2) is in the form of a line of rhombuses.
2. Carton blank of corrugated cardboard or card having at least one score line for preparing a fold line in the blank, the score line having a width that changes at regular intervals along its length, characterised in that the edges of the score line (2) are in the form of two opposing sine waves (2, 3).
3. Device for generating a score line in a carton blank according to either claim 1 or claim 2, having a substantially linear die and a die-plate serving as a counter-member, the die having a width that changes at regular intervals along its length and the form of a channel in the counter-member being matched to the form of a groove line in the die, characterised in that the channel (17) in the counter-member (16) that is matched to the shape of the groove line in the die (15) of the stamping tool (9) is in the form of a line of rhombuses in order to generate a score line (2) in the corrugated cardboard blank (1).
4. Device according to claim 3, especially a stamping device, characterised in that the transitional regions between the individual rhombuses of the line of rhombuses form the narrow regions (6, 19) that define the forced folding of the fold line.

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