DE102019103027B4 - Corrugated cardboard with tear device - Google Patents

Abstract

Corrugated cardboard (30) comprising:
a backsheet (32);
an inner layer (34);
at least one corrugated ply (36) disposed between the outer ply (32) and the inner ply (34); and
a ripping device (10) comprising a first score (12) and a second score (14),
wherein the first scoring (12) is formed along a predeterminable course in the outer layer (32) of the corrugated board (30), and
wherein the second score (14) is formed in the inner layer (34) of the corrugated board (30) substantially parallel to the first score (12) and comprises a plurality of score sections (142) along its course, with two successive score sections ( 142 _n , 142 _n+1 ) of the plurality of scoring sections have ends facing one another, which are arranged transversely to the course of the second scoring (14) with a first offset relative to one another.

Description

field of technology

The invention relates generally to the field of corrugated paperboard packaging. In particular, the invention relates to a corrugated cardboard with an integrated tearing device, and a technique for forming the tearing device in the corrugated cardboard.

State of the art

Corrugated board is a flat material used mainly in the packaging industry, which consists of a combination of corrugated and flat paper webs glued together. This characteristic structure gives the corrugated board a high level of stability in relation to its weight. The number of layers used may vary depending on the implementation. A classic form of corrugated board is three-layer corrugated board. The three-layer corrugated board comprises two flat cover layers and a corrugated layer arranged between the cover layers. The corrugated layer is glued to one of the cover layers on both sides along its wave crests or wave troughs.

Corrugated cardboard is used, for example, to make packaging. In order to be able to open the packaging quickly and easily after transport, these sometimes include linear tearing devices. A package can easily be opened by hand along a tear-off device. The technical implementation and design of the ripping device plays an important role here. On the one hand, the stability of the closed packaging must not be impaired by the tearing device and, on the other hand, the packaging must be easy to open. There are also aesthetic requirements. For example, it is desirable that the tear edges remaining on the packaging after the carton has been opened have as few or no traces of tears as possible.

Tears typically have perforations (e.g., line, herringbone, sharkline, or other perforations) punched/scored into the package along a predetermined path. The breakpoints of the perforations ensure that the cardboard is held together and the scores create targeted weak points in the packaging material in order to specify a specific tear path. When the corrugated cardboard packaging is torn open along the perforations, the sides of the tear form, which line the resulting opening in the packaging. In particular, the breakpoints of the perforation produce unsightly tear marks on the flanks of the tear. This should be avoided if possible.

A solution to this problem is suggested by the EP 2 390 196 B1 provided. It describes a corrugated cardboard with an integrated tearing device. For the tearing device, a continuous score is provided in an outer layer of the corrugated cardboard and a perforation is provided in the inner layer of the corrugated cardboard. The scoring in the outer layer and the perforation in the inner layer run essentially parallel to one another and are offset from one another transversely to the course of the tearing device. Due to the offset, the traces of tears from the perforations in the inner layer can be hidden.

The perforation is in the EP 2 390 196 B1 described as linear scoring interrupted by holding bars (cf 2 the patent specification), the holding webs and recesses of the perforation being oriented longitudinally to the direction of the perforation (ie longitudinally in relation to the course of the scoring). As a result, the stability and the tearing properties of the tearing device vary depending on the position of the perforation in relation to the corrugated profile of the corrugated cardboard.

From the DE 20 2008 011 556 U1 an opening aid with a variable angle of attack is known. The opening aid has an at least partially curved perforation line with material bridges and material gaps, the material bridges or material gaps having an orientation that deviates from the tangential to the perforation line with a variable angle of attack over the course of the perforation line.

The object of the present invention is to provide a corrugated board with a tearing device which has improved reproducibility with regard to its stability and tearing properties.

Brief summary of the invention

A corrugated board is provided to solve the problem on which the invention is based. The corrugated cardboard comprises an outer ply, an inner ply and at least one corrugated ply disposed between the outer ply and the inner ply. Furthermore, the corrugated cardboard comprises a tearing device. The ripping device includes a first score and a second score. The first scoring is formed along a predefinable course in the outer layer of the corrugated board. The second score is formed in the inner layer of the corrugated board substantially parallel to the first score and comprises (sequentially) a plurality of score sections along its length. Respectively two consecutive scribe sections of the plurality of scribe sections have mutually facing ends which are arranged transversely to the course of the second scribe with a first offset from one another.

The outer layer and inner layer are the facing top layers of the corrugated board. The outer layer is to be understood as the top layer of the corrugated board that is visible when the corrugated board is in a processed state (e.g. as a cuboid packaging). Correspondingly, the term "inner layer" describes the cover layer of the corrugated board opposite the outer layer, i.e. the cover layer of the corrugated board that faces away from the viewer (i.e. is not visible) when the corrugated board is in use.

The at least one corrugated layer of the corrugated cardboard is arranged between the inner layer and the outer layer. Along the periodic (i.e. wavy) deflections in its profile (wave crests and troughs), the corrugated layer is glued to the outer layer on one side and to the inner layer of the corrugated board on the other side. The claimed corrugated board can therefore be at least three-ply corrugated board. However, it is understood that the corrugated layer can be one of several intermediate layers of the corrugated cardboard. For example, in addition to the outer layer and the inner layer, the corrugated cardboard can have two corrugated layers and an additional flat intermediate layer arranged between the corrugated layers. It is understood that many other arrangements of corrugated layers and optional planar intermediate layers between the inner and outer layers are possible.

The term "ripper" should be understood to describe the function of the first and second scores formed in the corrugated board. The tearing device has a predeterminable course in the corrugated board. For example, the course of the ripping device can be predetermined by the course of the first scoring of the ripping device.

The first scoring can be designed in such a way that it creates a continuous severance along the course of the first scoring in the outer layer of the corrugated cardboard, that is to say has no breakpoints over its entire length.

The second scoring can be arranged transversely to the course of the second scoring (or transversely to the course of the first scoring) with a second offset to the first scoring. More specifically, each of the score portions of the second score may be positioned transversely to the path of the first score at a second offset from the first score. The second offset of the second scoring to the first scoring can be between 1 mm and 10 mm. The second offset of the second scoring relative to the first scoring can preferably be 1.5 mm. For the second offset of the second scoring relative to the first scoring, the scoring sections of the second scoring closest to the first scoring section are decisive. The second offset of the second scoring relative to the first scoring can preferably be pronounced in such a way that the second scoring is hidden from an observer by the outer layer of the corrugated cardboard when the corrugated cardboard has been torn open along the tearing device. Traces of tears that occur on the inner layer and the fluted layer of the corrugated cardboard when the tearing device is actuated can be concealed by the correct distance between the first and second scoring. Only the continuous (first) scoring in the outer layer is visible to the observer.

The scoring sections of the second scoring can be arranged relative to one another in such a way that two consecutive scoring sections adjoin each other directly along the course of the second scoring. Alternatively, the scoring sections of the second scoring can be arranged in relation to one another in such a way that two successive scoring sections have an overlap with one another along the course of the second scoring.

Due to the arrangement of the score sections of the second score in relation to one another, the second score can preferably have a holding web between the mutually facing ends of two successive score sections. The term "holding web" is to be understood as an area of the corrugated board between two consecutive score sections that is not scored and thereby holds the corrugated board together. The holding web can be formed transversely or inclined with respect to the course of the second scoring. To put it more precisely, if the score sections directly adjoin one another along the course of the second score, the holding web can be formed transversely to the course of the second score. If the scoring sections have an overlap with one another along the course of the second scoring, the holding web can be designed inclined with respect to the course. The degree of inclination of the holding web depends on the degree of overlap of the score sections.

According to one variant, the scoring sections of the second scoring can be arranged in such a way that two successive scoring sections transverse to the course of the second scoring each have a different second offset to the first scoring. In this case, every second of the successive scoring sections can have the same second offset to the first scoring. In other words, the scoring sections of the second scoring can alternately be thought of as two be arranged parallel to each other course lines of the second scoring. Two consecutive scoring sections can therefore have a third offset relative to one another transversely to the course of the second scoring. The third offset can correspond to the first offset of the ends of two consecutive scoring elements relative to one another. The third offset of two consecutive scoring sections can be in the range between 0.5 mm and 3 mm. The third offset of two consecutive scoring sections can preferably be 1 mm.

According to a further variant, at least some of the score sections of the second score can be designed in such a way that they are formed at an angle at least at one of their ends with respect to the course of the first (or the second) score. The angling of a scored section can preferably be formed in each case in the direction of the end of the nearest scored section. In other words, the end of a scribe section can be inclined towards the nearest end of the subsequent scribe section. Due to the inclination of the end areas of the scoring sections, on the one hand the first offset between the ends of two consecutive scoring sections can be shortened, which makes it easier to actuate (tear open) the tearing device. On the other hand, the third offset of the successive scoring sections relative to one another can be increased, as a result of which the stability of the corrugated cardboard can be increased independently of the position of the corrugated layer relative to the course of the first or second scoring.

The corrugated board may have a compressed thickness _Dw . The compressed thickness D _W is composed essentially of a thickness _DA of the outer layer, a thickness D _I of the inner layer and a compressed thickness D _Z of the at least one corrugated layer (ie intermediate layer) of the corrugated board. It goes without saying that the compressed thickness D _Z of the intermediate layer depends to a large extent on the number of corrugated layers and possibly flat layers which together form the intermediate layer. The compressed thickness of the corrugated board can be determined based on the grammage of the individual layers. The grammage is the standardized basis weight or the area-related mass of each layer. The following relationship applies to the compressed thickness D _W of the corrugated board: $${\text{D}}_{\text{w}}={\text{D}}_{\text{A}}+{\text{D}}_{\text{I}}+{\text{D}}_{\text{Z}}$$

According to a variant, the first scoring of the ripper can have a depth T ₁ . The depth T ₁ can extend from the outer layer in the direction of the inside of the corrugated board (ie in the direction of the inner layer). The depth T ₁ of the first scoring can preferably correspond exactly to the thickness D _A of the outer layer of the corrugated board. In other words, the first scoring can be designed in such a way that it completely severs the outer layer along the course of the first scoring. According to an alternative variant, the depth T ₁ can also be greater than the thickness D _A of the outer layer of the corrugated cardboard. However, the depth T ₁ of the first scoring must not extend into the inner layer of the corrugated board.

Somit kann gewährleistet werden, dass die erste Ritzung einerseits die Außenlage der Wellpappe vollständig durchtrennt und andererseits die Innenlage der Wellpappe nicht schwächt bzw. deren Stabilität beeinträchtigt.The following relationship applies to the depth T ₁ of the first scratch: $${\text{D}}_{\text{A}}\le {\text{<figure-callout id="1" label="T" filenames="DE102019103027B4\_0004.png" state="{{state}}">T</figure-callout>}}_1\le \left({\text{D}}_{\text{w}}-{\text{D}}_{\text{I}}\right)$$

It can thus be ensured that the first scoring on the one hand completely severs the outer layer of the corrugated cardboard and on the other hand does not weaken the inner layer of the corrugated cardboard or impair its stability.

The second scribe may have a depth T ₂ . The depth T ₂ extends from the inner layer in the direction of the inside of the corrugated board (that is, in the direction of the outer layer). Preferably, the depth T ₂ of the second scribe may correspond to the thickness D _I of the inner layer and the compressed thickness D _Z of the intermediate layer. However, the depth T ₂ of the second scoring can at least correspond to the thickness D ₁ of the inner layer. Preferably, each of the scribe sections of the second scribe has the same depth T ₂ . In other words, each scoring section of the second scoring can be designed in such a way that it completely severs at least the inner layer of the corrugated cardboard.

Somit kann gewährleistet werden, dass die Ritzabschnitte der zweiten Ritzung einerseits die Außenlage der Wellpappe nicht beschädigen, und andererseits wenigstens die Innenlage der Wellpappe von den Ritzabschnitten jeweils vollständig durchtrennt wird.The following relationship applies to the depth T ₂ of the second scoring: $${\text{D}}_{\text{I}}\le {\text{T}}_2\le \left({\text{D}}_{\text{W}}-{\text{D}}_{\text{A}}\right)$$

It can thus be ensured that the scoring sections of the second scoring on the one hand do not damage the outer layer of the corrugated cardboard and on the other hand at least the inner layer of the corrugated cardboard is completely severed by the scoring sections.

A corrugated paperboard with a tear device according to the present invention is advantageous over the prior art. The offset arrangement of the scoring sections of the second scoring in relation to one another can on the one hand increase the stability of the corrugated cardboard independently of the orientation of the corrugated profile of the corrugated cardboard. On the other hand, the tearing properties of the tearing device can be increased or reduced as required by orienting the holding webs transversely or inclined with respect to the course of the first or second scoring. By individually varying the first and third offsets and the overlapping of the scored sections with respect to one another, a favorable offset that is adapted to the respective application can be achieved ratio of stability and tear properties can be achieved.

To achieve the object on which the invention is based, a tool for forming a tearing device in a corrugated cardboard according to one of the variants described above is also provided. The tool comprises a first punching plate and a second punching plate which are arranged opposite one another and are movable relative to one another. The tool also includes a first scoring device which is arranged on the first punching plate and which includes a first scoring element which has a predeterminable course and is designed to produce the first scoring. Furthermore, the tool comprises a second scoring device which runs essentially parallel to the first scoring element, which is arranged on the second punching plate and which (successively) comprises a multiplicity of second scoring elements along its course. The second scoring elements are designed to produce the second scoring, with two consecutive second scoring elements of the plurality of second scoring elements each having ends facing one another, which are arranged transversely to the course of the second scoring device (240) with a first offset from one another.

According to a variant, the first punching plate can be arranged below the second punching plate. The first punching plate can have an essentially flat surface on which a corrugated board to be scored can be placed. In particular, when the first punching plate serves as a base for corrugated board to be scored, the first punching plate can be mounted rigidly. In this case, the second punching plate can be designed to carry out the punching movement with respect to the first punching plate. However, it goes without saying that, according to alternative variants, the first punching plate can also carry out the punching movement in relation to the second punching plate, or that both punching plates can move towards and away from one another.

The second scribe elements can be arranged such that each of the second scribe elements is arranged transversely to the course of the second scribe device (or transversely to the course of the first scribe element) with a second offset to the first scribe element. This means that the first scratching element and the second scratching elements are offset from one another in the tool.

Furthermore, the second scoring elements can be arranged in such a way that two successive scoring elements transverse to the course of the second scoring device each have a different second offset to the first scoring element.

The first scoring element can be in the form of a sharp-edged elevation in the first scoring device. Each of the second scoring elements can be in the form of a flat body on one edge of which a cutting edge is formed. The cutting edge of each second scribe element may preferably face the first scribe device. The cutting edge may be formed centrally or laterally along the respective edge of each alternate scribe (i.e. parallel to the side flanks of the respective scribe). Alternatively, the cutting edge can each have an angled profile at one end.

Each of the second scribing elements can have a thickness D ₂ . According to one variant, the first offset of the second scoring elements relative to one another can be predetermined by the thickness D ₂ . Thus, the first offset of two consecutive second scribing elements of thickness D ₂ can correspond to each of the second scribing elements.

The second scoring elements can be arranged relative to one another in such a way that in each case two consecutive second scoring elements directly adjoin one another along the course of the second scoring device. There are thus no gaps between the second scoring elements along the course of the second scoring device. According to an alternative variant, the second scoring elements can also be arranged relative to one another in such a way that in each case two consecutive second scoring elements have an overlap with one another along the course of the second scoring device.

The first scoring device may further include a backing plate. During a scoring process, the backing plate of the first scoring device may be opposite the second scoring elements (or the cutting edges of the second scoring elements).

The second scribe device may further include a backup block disposed opposite the first scribe member. During a scoring process, the counter-pressure block presses the corrugated board against the first scoring element, as a result of which this penetrates the outer layer of the corrugated board and creates a score or cut.

It goes without saying that, according to one variant, the first scratching element and the second scratching elements can be arranged in reversed relation to the above statements. Correspondingly, the first scoring element can be encompassed by the second scoring device in the form of a scoring line, while the second scoring elements are designed in the form of sharp-edged elevations in the first scoring device.

The terms "first offset", "second offset" and "third offset" are to be understood collectively as follows. The first offset describes the offset between two ends facing one another of two consecutive scoring sections or second scoring elements. The second offset refers to the offset between the second scribe (or each of the scribe sections) and the first scribe, or between the second scribe device (or each of the second scribe elements) and the first scribe element. The third offset is the offset between two consecutive scoring sections or second scoring elements. It should be noted that the first offset and the third offset can be identical (cf. e.g. the embodiment according to 1 ). According to alternative variants, however, the first offset and the third offset can also differ from one another. This is the case, for example, when the ends of two consecutive scoring sections or scoring elements are angled.

In order to achieve the object on which the invention is based, a method for forming a tearing device in a corrugated cardboard according to one of the variants described above is also provided. The method comprises the following steps: providing a tool according to one of the variants described above; providing a corrugated board between the first die and the second die of the tool; operating the tool so that the first die and the second die move toward each other; and scoring the corrugated paperboard, wherein the first scoring element penetrates the outer ply of the corrugated paperboard and the plurality of second scoring elements penetrate the inner ply of the corrugated paperboard.

The step of scoring the corrugated cardboard can include severing, by means of the first scoring element, the outer layer of the corrugated cardboard. In addition, the step of scoring the corrugated cardboard can include a partial or complete severing, by means of the first scoring element, of the at least one corrugated layer of the corrugated cardboard.

The step of scoring can include a section-wise severing of the inner layer of the corrugated board by means of the plurality of second scoring elements. In addition, the step of scoring can include a partial or complete severing in sections, by means of the plurality of second scoring elements, of the at least one corrugated layer of the corrugated cardboard.

character list

• 1 eine schematische Darstellung einer Variante der erfindungsgemäßen Aufreißvorrichtung;
• 2 eine schematische Darstellung eines Werkzeuges zur Ausbildung einer Aufrei-ßvorrichtung in einer Wellpappe gemäß der vorliegenden Erfindung;
• 3 eine weitere Darstellung des in 2 dargestellten Werkzeuges;
• 4 eine Darstellung des in den 2 und 3 dargestellten Werkzeuges mit einer Wellpappe; und
• 5 eine Darstellung eines Verfahrens zum Ausbilden einer Aufreißvorrichtung in einer Wellpappe gemäß der vorliegenden Erfindung.

Details, aspects and advantages of the invention described here result from the following drawings. Show it:

• 1 a schematic representation of a variant of the ripping device according to the invention;
• 2 a schematic representation of a tool for forming a tear-open device in a corrugated board according to the present invention;
• 3 another representation of the in 2 tool shown;
• 4 a representation of the in the 2 and 3 illustrated tool with a corrugated board; and
• 5 Figure 12 illustrates a method of forming a tear device in a corrugated board according to the present invention.

Detailed character description

Based on 1 an exemplary variant of the ripping device according to the invention is described in more detail below.

In 1 a section of a tearing device 10 of a corrugated board is shown schematically. The tearing device 10 comprises a first score 12 and a second score 14. The first score 12 is in the outer layer of the corrugated cardboard (in 1 not shown) and the second scoring 14 is formed in the inner layer of the corrugated cardboard (in 1 also not shown) formed. The first scoring 12 has no interruptions along its entire course. In other words, the first scoring 12 is continuous. The second scoring 14 has a multiplicity of scoring sections 142 in each case.

According to the illustration in 1 the second scoring 14 has an offset (second offset) to the first scoring 12 transversely to its course. For the second offset 13 of the second scoring 14 in relation to the first scoring 12, the scoring sections 142 of the second scoring 14 closest to the first scoring section 12 are decisive.

The scoring sections 142 of the second scoring 14 are arranged in relation to one another in such a way that two consecutive scoring sections (example 142 _n and 142 _n+1 ) along (ie along) the course of the second scoring 14 directly adjoin one another. Alternatively, the scoring sections 142 of the second scoring 14 can also be arranged in relation to one another in such a way that two successive scoring sections 142 _n and 142 _n+1 have an overlap with one another along the course of the second scoring 14 (in 1 not shown).

Since the second scoring sections 142 adjoin flush along the course of the second scoring 14 ßen or overlap, no holding webs between successive Ritz sections 142 _n and 142 _{n + 1} can arise in the longitudinal direction. According to the present invention, holding webs are realized by a first offset between successive scoring sections 142 transverse to the course of the second scoring. Specifically, successive scoring sections 142 _n and 142 " of the second scoring 142 are designed and arranged relative to one another in such a way that there is a first offset between the facing ends of two successive scoring sections 142 _n and 142 _n+1 , which acts as a holding web. The first offset or holding web runs in a straight line from the end of a scoring section 142 _n to the nearest end of the subsequent scoring section 142 _n+1 .

As an alternative to using 1 described ripping device, at least some of the scoring sections of the second scoring can be angled at their ends, it being possible for the angling to be inclined in the direction of the closest scoring section.

2 shows a schematic view of a tool 20 according to the invention. The tool 20 comprises a first punching plate 22 and a second punching plate 24 opposite the first punching plate 22.

A first scoring device 220 is arranged on the first punching plate 22 . The first scoring device 220 comprises a first scoring element 222. The course of the scoring element 222 specifies the course of the scoring in the outer layer of a corrugated cardboard to be scored. According to the illustration in 2 the scratching element 222 has a rectilinear course. It goes without saying that the course of the first scratching element 222 does not have to be straight. Rather, the first scratching element 222 can have any desired course. The first scoring device 220 also includes a counter-punching plate 224, on the surface of which the first scoring element 222 protrudes as a sharp-edged elevation.

A second scoring device 240 is arranged on the second punching plate 24 . The second scoring device 240 runs essentially parallel to the first scoring element 222 of the first scoring device 220. Furthermore, the second scoring device 240 comprises a plurality of second scoring elements 242 in succession along its course, with two successive second scoring elements (in the figures for example _242n and 242 _n+1 ) are arranged transversely to the course of the second scoring device (240) by a first or third offset relative to one another. The second scoring elements 242 are each arranged parallel to the first scoring element 222 , each of the second scoring elements 242 having a second offset relative to the first scoring element 222 transversely to the course of the second scoring device 240 . A counter-pressure block 244 is also arranged on the second punching plate 24 . More specifically, the backup block 244 is positioned opposite the first scribe element 222 of the first scribe device.

In 3 is the tool 20 according to 2 shown in a view perpendicular to the course of the scratching elements 222, 242 (242 _n and 242 _n+1 ). The first or third offset between two adjacent second scoring elements 242 _n and 242 _n+1 corresponds to the illustration in 3 a thickness D ₂ of the second scoring elements 242. Alternatively, the first or third offset can also be smaller or larger than the thickness D ₂ of the second scoring elements 242. Each of the second scoring elements 242 has a cutting edge 243 on its side facing the first punching plate 22 .

Both of the in 3 The second scoring elements 242 illustrated have a second offset to the first scoring element 222 of the first scoring device 220 transversely to the course of the second scoring device 240 . The counter-pressure block 244 is arranged laterally next to the second scoring elements 242 . This serves to press the outer layer of corrugated board to be scored against the first scoring element 222 .

4 shows the tool according to the 2 and 3 in a view perpendicular to the course of the score lines 222, 242 (242 _n and 242 _n+1 ), wherein a corrugated cardboard 30 to be punched is arranged between the first punching plate 22 and the second punching plate 24 . The corrugated cardboard 30 comprises an outer layer 32, an inner layer 34 and a corrugated layer 36 arranged between the outer layer 32 and the inner layer 34. The corrugated cardboard 30 lies on the flat surface of the first die plate 22, with the outer layer 32 of the corrugated cardboard 30 facing the first die plate 22 and the inner layer 34 faces the second punching plate 24 .

A state is shown in which the first punching plate 22 and the second punching plate 24 have already been moved towards one another. The counter-pressure block 244 presses the corrugated cardboard 30 with its outer layer 32 onto the first scoring element 222 . The pressure causes the first scoring element 222 to sever at least the outer ply 32 of the corrugated board 30 . Depending on the depth of penetration of the first scoring element 222 into the corrugated cardboard 30, the intermediate layer 36 of the corrugated cardboard 30 can also be at least partially severed.

The second scoring elements 242 are arranged with respect to the counter-pressure block 244 such that their respective cutting edge 243 in the direction of the first punching plate 22 protrude beyond the counter-pressure block 244. Since the outer layer 32 of the corrugated cardboard 30 rests against the counter-punching plate 224 of the first scoring device 220, the cutting edges 243 of the second scoring elements 242 press into the inner layer 34 of the corrugated cardboard 30 and cut through it, between two consecutive second scoring elements _242n and 242", In each case, one web remains running transversely to the course of the second scoring device 240, on which the inner layer 34 of the corrugated cardboard 30 is not severed will.

In connection with 5 a method of forming a tearing device in a corrugated board according to the present invention will now be described in more detail.

In a first step S52, the method includes providing a tool for forming a tearing device in a corrugated board. The provided tool can, for example, a tool 20 according to 2 until 4 be.

In a second step S54, the method includes providing a corrugated cardboard between the first punching plate 22 and the second punching plate 24 of the tool 20. The corrugated cardboard can be as in 4 corrugated cardboard 30 shown. The corrugated board 30 can thus comprise an outer layer 32 , an inner layer 34 and a corrugated layer 36 arranged between the outer layer 32 and the inner layer 34 .

In a third step S56, the method includes actuating the tool 20 so that the first punching plate 22 and the second punching plate 24 move towards one another.

In a fourth step S58, the method includes scoring the corrugated cardboard 30, with the first scoring element 222 penetrating the outer layer 32 of the corrugated cardboard 30 and the plurality of second scoring elements 242 penetrating the inner layer 34 of the corrugated cardboard 30.

Step S58 of scoring the corrugated cardboard 30 can include a severing, by means of the first scoring element 222, of the outer layer 32 of the corrugated cardboard 30 and, depending on the penetration depth of the first scoring element 222 into the corrugated cardboard 30, also a partial or complete severing of the corrugated layer 36.

Furthermore, step S58 of scoring can include a sectional severing of the inner layer 34 of the corrugated cardboard 30 by means of the plurality of second scoring elements 242 and, depending on the penetration depth of the second scoring elements 242 into the corrugated cardboard 30, also a partial or complete sectional severing of the corrugated layer 36 .

With the technique provided by the present invention, a uniformly high stability of the corrugated board can be ensured before the actuation of the ripping device (i.e. before the corrugated board is ripped open). Furthermore, the tearing properties of the tearing device can be increased since the holding webs between the score sections of the second score are arranged transversely to the course of the score.

Reference List

10

ripping device

12

First scratch

13

Lateral distance between the first score 12 and the second score 14

14

Second scratch

142

Score portion of the second score of the ripper 10a

142n and 142n+1

Two consecutive scoring sections of the second scoring 142

20

Tool for forming a ripping device

22

First punching plate

220

First scoring device

222

First scoring element

224

counter punch plate

24

Second punching plate

240

Second scoring device

242

Second scratching element

242n and 242",

Two consecutive second scoring elements 242

243

Cutting edges of the second scoring elements 242

244

back pressure block

30

corrugated cardboard

32

Outer layer of corrugated board 30

34

Inner layer of corrugated board 30

46

corrugated cardboard 30

D2

Thickness of the second scoring element 242

Claims (13)

A corrugated paperboard (30) comprising: an outer ply (32); an inner layer (34); at least one corrugated ply (36) disposed between the outer ply (32) and the inner ply (34); and a tearing device (10) comprising a first score (12) and a second score (14), the first score (12) being formed along a predeterminable course in the outer layer (32) of the corrugated cardboard (30), and the second Scoring (14) running essentially parallel to the first scoring (12) is formed in the inner layer (34) of the corrugated board (30) and comprises a multiplicity of scoring sections (142) along its course, with two successive scoring sections (142 _n , 142 _n+1 ) of the plurality of scoring sections have ends facing one another, which are arranged transversely to the course of the second scoring (14) with a first offset relative to one another. Corrugated cardboard (30) after claim 1 , wherein each of the score sections (142) of the second score (14) is arranged transversely to the course of the first score (14) with a second offset (13) to the first score (12). Corrugated cardboard (30) after claim 1 or 2 , wherein two successive scoring sections (142 _n , 142 _n+1 ) transverse to the course of the first scoring (14) each have a different second offset (13) to the first scoring (12). Corrugated board (30) according to one of the preceding claims, wherein the score sections (142) of the second score (14) are arranged relative to one another in such a way that two consecutive score sections (142 _n , 142 _n+1 ) along the course of the second score (14) connect directly to each other. Corrugated cardboard (30) according to one of Claims 1 until 3 , wherein the scoring sections (142) of the second scoring (14) are arranged relative to one another in such a way that two successive scoring sections (142 _n , 142 _n+1 ) in each case have an overlap with one another along the course of the second scoring (14). Tool (20) for forming a tearing device (10) in a corrugated cardboard (30) according to one of Claims 1 until 5 wherein the tool (20) comprises: a first die (22); a second punching plate (24), the first punching plate (22) and the second punching plate (24) being arranged opposite to one another and being movable relative to one another; a first scoring device (220) which is arranged on the first punching plate (22) and which comprises a first scoring element (222) which has a predetermined course and is designed to produce the first scoring (12); and a second scoring device (240) running substantially parallel to the first scoring element (222), which is arranged on the second punching plate (24) and which comprises a plurality of second scoring elements (242) along its length, which are used to produce the second scoring (14), wherein in each case two consecutive second scoring elements (242 _n , 242 _n+1 ) of the plurality of second scoring elements (242) have ends facing one another, which are arranged transversely to the course of the second scoring device (240) with a first offset relative to one another are. tool (20) after claim 6 , wherein the second scribe elements (242) are arranged such that each of the second scribe elements (242) is arranged transversely to the course of the first scribe element (222) with a second offset to the first scribe element (222). tool (20) after claim 6 or 7 , wherein the second scoring elements (242) are arranged such that two successive scoring elements (242 _n , 242 _n+1 ) transverse to the course of the second scoring device (240) each have a different second offset to the first scoring element (222). Tool (20) according to one of Claims 6 until 8th , wherein each of the second scribing elements (242) has a thickness (D ₂ ). tool (20) after claim 9 , wherein the first offset of the mutually facing ends of two consecutive second scribing elements (242 _n , 242 _n+1 ) corresponds to the thickness (D ₂ ) of the second scribing elements (242). Tool (20) according to one of Claims 6 until 10 , wherein the second scoring elements (242) are arranged relative to one another in such a way that two consecutive second scoring elements (242 _n , 242 _n+1 ) follow one another directly along the course of the second scoring device (240). Tool (20) according to one of Claims 6 until 10 , wherein the second scoring elements (242) are arranged relative to one another in such a way that two consecutive second scoring elements (242 _n , 242 _n+1 ) have an overlap with one another along the course of the second scoring device (240). A method of forming a tearing device (10) in a corrugated board (30) according to any one of Claims 1 until 5 , wherein the method comprises: providing (S52) a tool (20) according to one of Claims 6 until 12 ; Providing (S54) a corrugated cardboard (30) between the first punching plate (22) and the second punching plate (24) of the tool (20); actuating (S56) the tool (20) so that the first punching plate (22) and the second punching plate (24) move toward one another; and scoring (S58) the corrugated cardboard (30), wherein the first scoring element (222) penetrates into the outer layer (32) of the corrugated cardboard (30) and the plurality of second scoring elements (242) penetrates into the inner layer (34) of the corrugated cardboard (30) penetrates.

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