ES2545384T3 - Installation and procedure for the manufacture of corrugated cardboard sheets - Google Patents

Abstract

Installation of corrugated cardboard for the manufacture of corrugated cardboard sheets, with a. at least one production device (7, 27) for producing an endless corrugated cardboard strip (2, 28) from at least one corrugated strip (9) and at least one covering band (12, 29 ), b. at least one longitudinal / grooving cutting device (32) for the longitudinal cutting and grooving of the endless corrugated cardboard strip (2, 28) along the working direction (13), c. at least one cutting device (40) for cutting corrugated cardboard sheets (39) from the endless corrugated cardboard strip (2, 28) and d. at least one control device (54) for controlling the installation of corrugated cardboard (1), characterized in that e. at least one drilling device (31; 31a; 31b, 31c) is provided with at least one drilling unit (55, 56) for drilling the at least one covering band (12, 29) at along the work direction (13), f. the at least one cutting device (40) of the at least one drilling device (31; 31a, 31b; 31c) is then arranged in the working direction (13), g. the at least one drilling unit (55, 56) can be rotated around a rotation axis (57, 58) that extends in the transverse direction with respect to the working direction (13) to bring it into contact with the at least one covering band (12, 29), h. The at least one drilling device (31; 31a; 31b; 31c) has at least a first drilling unit (55) for drilling a first covering band (12) and at least a second drilling unit (55), opposite to the at least one first perforation unit (55) with respect to the corrugated cardboard strip (2, 28), for the perforation of a second covering band (29).

Description

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DESCRIPTION

Installation and procedure for the manufacture of corrugated cardboard sheets

The invention relates to an installation of corrugated cardboard for the manufacture of corrugated cardboard sheets, as well as a corresponding process.

Corrugated cardboard installations for the manufacture of corrugated sheets are known for a long time, for example from DE 103 56 037 A1. The sheets of corrugated cardboard manufactured undergo in many cases a subsequent processing to obtain packaging, the packaging must be, on the one hand, very stable for the protection of the product housed therein and, on the other hand, easy to open for Product withdrawal. For the manufacture of packaging that meets these requirements, corrugated cardboard sheets must be prepared and manufactured accordingly.

From EP 1 375 361 B1 it is known to provide cuts for the corrugated cardboard sheet covering bands by means of two blades. The cuts in the coating bands are opposite each other and cut the coating bands at least 50% of their thickness. When opening packages made from these sheets of corrugated cardboard, the cut cover strips act as shear edges, which completely cut the cover strips and the corrugated strip. The drawback is that the cuts in the coating bands act as hinges and form unwanted flex points on the corrugated cardboard sheets. Packaging made from corrugated cardboard sheets therefore has an inherent stability that is not satisfactory. In addition, it is expensive to provide the sheets of corrugated cardboard individually from the cuts.

The invention has the objective of creating a corrugated cardboard installation and a process that allows a simple manufacture of corrugated cardboard sheets with improved stability and tear-open properties.

This objective is achieved by the characteristics of claim 1 as well as the other independent claim 7 relating to the process. The essence of the invention is to provide at least one perforation device in a corrugated cardboard installation. At least one perforation device is fed an endless corrugated cardboard strip of at least one corrugated strip and at least one coating band. By means of the at least one drilling device, the at least one covering band is perforated, the at least one covering band being cut along a work direction alternately completely in some sections and not being cut in others sections. The at least one wavy band is not cut and remains substantially intact. By means of at least one cutting device arranged next to the at least one drilling device seen in the working direction, corrugated cardboard sheets of the desired format are cut from the corrugated endless web. Thanks to the perforation of the at least one cover strip, the corrugated cardboard sheets have good stability and tear-open properties at the same time. In particular, thanks to the perforation of the at least one cover strip, unwanted bending points in the corrugated cardboard sheets are avoided. Because the at least one perforation device is arranged in front of the at least one cutting device, the perforation of the at least one coating strip takes place before the endless corrugated cardboard strip is cut to obtain sheets of corrugated cardboard. The at least one drilling device is therefore integrated in the installation of corrugated cardboard and in the manufacture of corrugated cardboard sheets, which simplifies manufacturing. Thanks to this it is possible to save time and costs. The at least one drilling device has at least a first drilling unit for drilling a first covering strip and at least a second drilling unit, opposite to the at least one first drilling unit with respect to the corrugated cardboard strip, for the perforation of a second coating band.

Other advantageous configurations of the invention result from the dependent claims.

Additional features, advantages and details of the invention result from the description set forth below of several embodiments with the help of the drawing. They show:

Figure 1 a schematic representation of a first part of a corrugated cardboard installation according to a first embodiment.

Figure 2 a schematic representation of a second part of a corrugated cardboard installation according to a first embodiment.

Figure 3 a schematic representation of a perforation device and a longitudinal / grooving cutting device of the corrugated cardboard installation according to the first embodiment.

Figure 4 a detail in an enlarged view of the drilling device according to Figure 3.

Figure 5 a sectional view of the drilling device along the line V-V in Figure 4.

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Figure 6 a side representation of a drilling disc of the drilling device according to Figure

3.

Figure 7 shows a detail in an enlarged view of the drilling disc according to Figure 6.

Figure 8 shows a side representation of a perforation disk of a corrugated cardboard installation according to a second embodiment.

Figure 9 a detail in an enlarged view of the drilling disc according to Figure 8.

Figure 10 a side representation of a perforation disk of a corrugated cardboard installation according to a third embodiment.

Figure 11 shows a detail in an enlarged view of the drilling disc according to Figure 10.

Figure 12 shows a side representation of a perforation disk of a corrugated cardboard installation according to a fourth embodiment.

Figure 13 shows a detail in an enlarged view of the drilling disc according to Figure 12.

Next, a first embodiment of the invention will be described with reference to Figures 1 to 7. A corrugated cardboard installation 1 presents for the manufacture of a corrugated cardboard strip 2 unilaterally contracolated a first development device 3 to develop a first band of material 4, a second development device 5 to develop a second band of material 6 and a first production device 7. The first production device 7 comprises for the generation of a ripple in the second band of material 6 two cylinders striated 8 arranged adjacent to each other and housed rotatably. After generation of the corrugation between adjacent striated cylinders 8, the second band of material 6 is presented as a corrugated strip 9. Furthermore, for gluing the ridges of the corrugated strip 9, the first production device 7 comprises a unit of gluing 10, which is arranged adjacent to the striated cylinders 8. To join the wavy band 9 glued to the first band of material 4, in the first production device 7 there is provided a pressure cylinder 11 arranged adjacent to a splined cylinder 8 and rotatably housed. After joining the corrugated strip 9, the first band of material 4 is called the first covering band 12. The production device 7 for the manufacture of a corrugated cardboard strip 2 unilaterally contracolated is generally known, for example from EP 0 687 552 A (corresponds to US patent US 5,632,850), document DE 195 36 007 A (corresponds to document GB 2,305,675A) or document DE 43 06 158 A1, referring to these regarding the details.

Seen in the working direction 13, following the first production device 7 there is arranged a bypass cylinder 14 rotatably housed and a preheating device 15. For heating the corrugated cardboard strip 2 unilaterally countersunk and a third band of material 16, the preheating device 15 has two heating cylinders 17 arranged one above the other and housed in a rotating manner. A third development device 18 is provided for the development of the third band of material 16.

Seen in the working direction 13, after the preheating device 15 there is a gluing mechanism 19. The gluing mechanism 19 has a glue cylinder 20 rotatably housed, which is partly arranged in a glue container 21 full of tail The corrugated strip 9 of the corrugated cardboard strip 2 unilaterally collated is in contact with the gluing cylinder 20.

Seen in the working direction 13, following the gluing mechanism 19, a heating and pressure device 22 is provided, which has a horizontal heating table 23, which extends in the working direction 13, with heating plates. Next to the heating table 23 there is arranged an endless pressure belt 25, driven, deflected by three guide cylinders 24 rotatably housed. Between the pressure belt and the heating table 23 a pressure groove 26 is made, by which the corrugated cardboard strip 2 can be guided unilaterally and glued and the third material band 16. The most detailed structure of the heating device and pressure 22 is known from DE 199 54 754 A1. The gluing mechanism 19 and the heating and pressure device 22 represent a second production device 27 for the manufacture of a corrugated cardboard band 28 bilaterally countersunk. After joining the corrugated cardboard strip 2 unilaterally collated, the third band of material 16 is called the second covering band 29. The bands of material 4, 6, 16 are in particular endless paper bands.

Seen in the working direction 13, a second multifunctional unit 30 is arranged next to the second production device 27. The multifunctional unit 30 comprises a drilling device 31 for drilling the first and second covering strips 12, 29 along of the working direction 13 and a longitudinal / grooving cutting device 32 for the longitudinal cutting and grooving of the corrugated cardboard strip 28 bilaterally collated along the working direction 13. The longitudinal / grooving cutting device

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32 comprises a first slotting station 33, a second slotting station 34 arranged next to it and two longitudinal cutting devices 35, arranged next to the slotting devices 33, 34. The structure of the multifunctional unit 30 will be described as continuation in more detail.

Seen in the working direction 13, a change needle is arranged next to the multifunction unit 30

36. By means of the change needle 36, the strips 37, 38 cut in the longitudinal direction of the corrugated cardboard strip 28 can be separated bilaterally in the longitudinal / grooving device 32.

For cutting the corrugated cardboard sheets 39 from the band sections 37, 38 of the corrugated cardboard band 28, seen in the working direction 13 following the change needle 36, a cutting device 40 is provided Therefore, the cutting device 40 is also arranged next to the drilling device 31 seen in the working direction 13. For the cross section of the first section of band 37, the cutting device 40 has a first pair of cylinders of cross section 41 and for the cross section of the second section of band 38 a second pair of cross section cylinders 42. The cylinders of the pairs of cross section cylinders 41, 42 respectively have a knife holder bar 43, which extends radially towards outside and in the perpendicular direction with respect to the working direction 13. The knife holder bars 43 of a pair of cross-cutting cylinders 41, 42 cooperates n for the cross section of the band sections 37, 38.

Next to the first pair of cross-cutting cylinders 41, a first conveyor belt 44 is arranged, which is guided around drive cylinders that can be rotatably operated. For the stacking of the corrugated cardboard sheets 39 transported by the first transport belt 44, a first stacking tray 46 is arranged next to the first transport tape 44, with a first stop wall 47 extending in the direction vertical. The first stacking tray 46 can be adjusted in height, as indicated in Figure 2 by a first direction arrow 48. The first stacking tray 46 can be lowered for subsequent transport of the corrugated cardboard sheets 39 stacked to a bottom of the installation 49, which carries the installation of corrugated cardboard 1. Next to the second pair of cross-cutting cylinders 42, a second conveyor belt 50 is arranged, which is also guided around drive cylinders 45 that can be operated so swivel For stacking the corrugated cardboard sheets 39 transported by the second transport belt 50, a second stacking tray 51 with a second stop wall 52 extending in the vertical direction is arranged next to the second transport belt 50 . As indicated in Figure 2 by a second direction arrow 53, the height of the second transport belt 50 can be adapted to the height of the corrugated cardboard sheets 39 stacked in the second stacking tray 51.

For the control of the installation of corrugated cardboard 1 an electronic control device 54 is provided, which for the exchange of data has a signal connection with the development devices 3, 5, 18, the production devices 7, 27, the preheating device 15, the drilling device 31, the longitudinal / grooving cutting device 32, the changing needle 36 and the cutting device 40.

Next, the multifunction unit 30 will be described in more detail. The drilling device 31 and the longitudinal / grooving cutting device 32 are integrated in the multifunction unit 30. In particular, the drilling device 31 is made at the same time. as the first slotting station

33. The perforation device 31 has several first perforation units 55 for perforation of the first covering band 12 arranged side by side in the transverse direction with respect to the working direction 13. For the perforation of the second band of coating 29, the drilling device 31 also has several drilling units 45 arranged side by side in the transverse direction with respect to the working direction 13, which are opposite the first drilling units 55 with respect to the corrugated cardboard band 28. To bring them into contact with the first cover strip 12, the first perforation units 55 are rotatable independently of one another around a pivot axis 57 which extends in the transverse direction relative to the direction of work 13. Correspondingly, to bring them into contact with the second covering band 29, the second units of drilling 56 can be rotated independently of each other around a second axis of rotation 58, which extends in the transverse direction with respect to the working direction 13. The rotation of the different drilling units 55, 56 can be controlled by the device of control 54. In addition, the drilling units 55, 56 can be moved along their corresponding rotation axes 57, 58 independently of each other with the aid of the control device

54. In addition, a first drilling unit 55 and a corresponding second drilling unit 56 can be coupled respectively for uniform displacement along their rotation axes 57, 58 mechanically or by means of the control device 54. Of this so it is possible to pierce the covering bands 12, 29 exactly on top of each other. Alternatively or additionally, the drilling units 55, 56 may be movable to bring them into contact with the covering bands 12, 29 in the transverse direction with respect to these and with respect to the corresponding rotation axes 57, 58.

The drilling units 55, 56 respectively have a tool holder 59, in which a drilling disk 60 is housed, which can be rotatably operated. Drilling discs 60 feature

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respectively a disc base body 61 and drill teeth 62 molded into a piece therein. The piercing teeth 62 are arranged in the circumference of the disk base body 61 and are uniformly spaced from each other. The piercing teeth 62 may be tempered. The disk base body 61 has in its circumference a conically convergent end section 63, which becomes without stepping in the drilling teeth 62 having a cross section in V. The drilling discs 60 can be fixed respectively by means of fixing holes 64 evenly distributed in the circumference in the corresponding tool holder 59, and can be rotatably operated.

Drilling teeth 62 are made substantially as a rectangular wedge. They respectively have two opposite rectangular tooth side walls 65, two triangular tooth front walls 65 which extend substantially in the perpendicular direction with respect to the tooth side walls 65 and a perforation edge 67. Between two drill teeth 62 arranged in a manner an adjacent hole 68 is respectively made. The holes 68 have a width BL respectively. The tooth front walls 66 of a drill tooth 62 extend substantially parallel to each other, imaginary extensions V converging from the tooth front walls 66 approximately at the center M of the drill disk 60. The drill teeth 62 have a radial height HZ and a width BZ, corresponding the width BZ approximately to the width BL of the holes 68.

The drilling units 55, 56 define with their corresponding drilling edges 67 a minimum distance AP from each other in the transverse direction with respect to the working direction 13. Correspondingly, the covering bands 12, 29 define with their inner walls oriented towards the corrugated strip 9 a minimum distance AD between the covering bands 12, 29 in the transverse direction with respect to the working direction 13. The drilling device 31 is made such that the minimum distance AP between the drilling units 55, 56 corresponds to at least 80%, in particular at least 90% and in particular at least 95% of the minimum distance AD between the covering bands 12, 29. The minimum distance AP between the drilling units 55, 56 can be adjusted by rotating them around the corresponding rotation axes 57, 58, the control device 54 being made such that the Minimum distance AP can be automatically adjusted based on the minimum distance AD between the covering bands 12, 29.

In the tool holders 59 of the drilling units 55, 56, grooving tools 59 are also arranged. Seen in the working direction 13, the grooving tools 69 are arranged next to the drilling discs 60, the tools being able to contact of grooving 69 additionally or alternatively to the perforation discs 60 with the corrugated cardboard band 28. The perforation device 31 is therefore made at the same time as the first grooving station 33.

The second grooving station 34 has several first grooving units 70 and several second grooving units 71, which are opposite each other with respect to the corrugated cardboard band 28. The first grooving units 70 are rotatable independently of each other. around a third axis of rotation 73 to bring them into contact with the corrugated cardboard band 28. Correspondingly, the second grooving units 71 are rotatable independently of each other around a fourth axis of rotation 73. The grooving units 70, 71 have a structure corresponding to the drilling units 55, 56, although with the difference that instead of drilling discs 60 slotting discs 74 are arranged in the tool holders 59. The slotting discs 74 have no function. However, they can be replaced by additional drilling discs 60, so that the grooving units 70, 71 can be retrofitted to form drilling units. The grooving tools 59 are housed in the tool holders 59 of the drilling units 55, 56 and the grooving units 70, 71, which can be rotatably operated and are movable independently of each other along the rotation axes 57 , 58, 72, 73 corresponding, in addition to being able to contact the corrugated cardboard band 28 one separately from the others.

The longitudinal cutting stations 35 are arranged next to the second slotting station 34. The longitudinal cutting stations 35 respectively have several upper blades 75 and lower blades 76 that can be rotatably operated, which are movable independently of each other. the transverse direction with respect to the working direction 13 and which can be contacted with the corrugated cardboard band 28 for the longitudinal cutting thereof. The exact structure of the longitudinal / grooving device 32 is known from DE 197 54 799 A (corresponds to US 6 071 222), as well as from DE 101 31 833 A, which are referred to here for Consult the detailed structure.

Next, the operation of the corrugated cardboard installation 1 will be described more exactly. The first and second strip of material 4, 6 are developed from the first and second development device 3, 5 and fed to the first production device 7 The second band of material 6 is passed through the striated cylinders 8, whereby the corrugated band 9 is generated. By means of the gluing unit 10, the ridges of the corrugated strip 9 are provided with glue. The corrugated strip 9 provided with glue and the first band of material 4 are passed between one of the striatum cylinders 8 and the pressure cylinder 11 and are joined together, generating the corrugated cardboard strip 2 unilaterally collated. The unilaterally endless corrugated cardboard strip 2 is exited from the first production device 7 and deflected by the deflection cylinder 14 and fed to the preheating device 15. In addition, the third material band 16 of the third device is developed from

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development 18 and is also fed to the preheating device 15. The corrugated cardboard band 2 and the third material band 15 are passed in the preheating device 15 through heating cylinders 17 and are heated. The heated corrugated cardboard strip 2 and the third band of heated material 16 are output from the preheating device 15 and fed to the second production device 27.

In the second production device 27, the corrugated cardboard strip 2 unilaterally collated is fed to the gluing mechanism 19. The ridges disposed of the corrugated strip 9 of the unilaterally corrugated cardboard band 2 are provided in the gluing mechanism 19 glue by the gluing cylinder 20. The glued cardboard strip 2 is fed together with the third band of material 16 to the heating and pressure device 22. In the heating and pressure device 22, the corrugated cardboard band 2 glued and the third band of material 16 are passed through the pressure groove 26, the corrugated cardboard band 2 joining unilaterally bonded to the third band of material 16 to form the bilaterally corrugated cardboard band 28. By means of the pressure belt 25 and the heating table 23, the corrugated cardboard strip 2 and the third band of material 16 are compressed, heating and drying the heating table 23 at the same time.

The bilaterally corrugated cardboard strip 28 is then fed to the multifunctional unit

30. In the perforation device 31, the covering bands 12, 29 of the corrugated cardboard band 28 are perforated. To this end, the perforation discs 60 are brought into contact with the corrugated cardboard band 28 by rotating the units drilling 55, 56 around the corresponding turning shafts 58, 58. The contacting of the perforation discs 60 is controlled by the control device 54. The control device 54 has exact data about the operating status of the corrugated cardboard installation 1 and the material bands 4, 6, 16. In particular, the control device 54 has exact data regarding the thickness of the material bands 4, 6, 16 and the striated cylinders 8 that generate the corrugation. From this data, the control device 54 calculates the minimum distance AD between the covering bands 12, 29. The rotation of the drilling units 55, 56 is performed based on the minimum distance AD calculated between the covering bands 12, 29 in such a way that the drilling discs 60 only pierce the covering bands 12, 29 the corrugated strip 9 disposed between them being substantially intact. For this, the control device 54 adjusts the minimum distance AP between the drilling units 55, 56 such that it corresponds to at least 80%, in particular at least 90% and in particular at least 95% of the minimum distance AD between the covering bands 12, 29. A variation of the minimum distance AD between the covering bands 12, 29 is detected by the control device 54 and the minimum distance AP between the drilling units 55, 56 adapts correspondingly automatically.

During drilling, the covering bands 12, 29 are cut along one working direction 13 alternately completely in some sections and not cut in other sections, preferably more than 50% of the length of the direction 13 being maintained. the covering bands 12, 29 uncut during drilling. The completely cut sections have a length corresponding to the width BZ of the drilling teeth 62. Correspondingly, the uncut sections have a length corresponding to the width BL of the holes 68. By means of the widths BZ, BL of the teeth of perforation 62 and the recesses 68 disposed therebetween, the tear-open properties of the perforated corrugated cardboard web 28 can be adjusted. The greater the width BZ of the piercing teeth 62 in relation to the width BL of the recesses 68 the easier it is to tear open the corrugated cardboard band 28 and vice versa. Since the perforation device 31 is arranged next to the production devices 7, 27, the corrugated cardboard web 28 generated is still wet during perforation, so that the covering bands 12, 28 can be easily cut by the edges of perforation 67. The corrugated strip 9 is not cut during the perforation of the covering bands 12, 29 and remains substantially intact. Therefore, the stability of the corrugated strip 9 is maintained. Thanks to the uncut sections, the perforated cover bands 12, 29 do not form unwanted bending points, so that the cover bands 12, 29 present together with the wavy band 9 substantially intact very good stability properties in combination with very good tear opening properties. Thanks to the fact that the drilling device 31 and the longitudinal cutting / grooving device 32 are assembled in the multifunctional unit 30, the drilling can be seamlessly integrated into an automatic format change. Drilling can be done very precisely with respect to longitudinal cutting and grooving.

The perforated corrugated cardboard band 28 is then grooved in the first and / or second grooving station 33, 34 and then cut longitudinally in the longitudinal cutting stations 35 to obtain two or more sections of band 37, 38.

The longitudinally cut corrugated cardboard band 28 is exited from the multifunctional unit 30 and is passed through the changing needle 36, the first and second section of band 37, 38 being divided. The first section of band 37 is passed between the first pair of cross-cutting cylinders 41 of the cutting device 40, generating through the knife holder bars 43 sheets of corrugated cardboard 39 of the desired format. Correspondingly, the second section of band 38 is passed between the second pair of cross-cutting cylinders 42 of the cutting device 40, also generating by means of the knife holder bars 43 sheets of corrugated cardboard 39 of the desired format. Thanks to the fact that the cutting device 40 is arranged after the

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punching device 31, the manufacture of perforated corrugated cardboard sheets 39 is possible in a simple manner. The previously perforated corrugated cardboard strip 28 is cut by the cutting device 40 to obtain corrugated cardboard sheets 39 of the desired format. Thanks to the integration of the perforation device 31 in the corrugated cardboard installation 1, the perforation is integrated in the manufacturing process of the corrugated cardboard sheets 39, which saves time and costs. Thanks to the integration of the perforation device 31 in the corrugated cardboard installation, the fact that the corrugated cardboard sheet 9 is still wet and smooth can be taken advantage of by deviating from the perforation tools and remaining intact.

The perforated corrugated cardboard sheets 39 are transported through the conveyor belts 44, 50 to the corresponding stacking trays 46, 51 and stacked there.

Next, a second embodiment of the invention will be described with reference to Figures 8 and 9. The identical parts from the construction point of view are designated with the same reference signs as in the first embodiment, to whose description It refers in this regard. The different parts from the constructive point of view although similar from the functional point of view are designated with the same reference signs adding the letter a. The essential difference compared to the first embodiment is in the configuration of the drilling discs 60a. The tooth side walls 65a of the drilling teeth 62a are substantially made as a parallelogram. The front tooth walls 66a enclose an angle of less than 90 ° with the drilling edge 67a. An imaginary extension V of the front tooth walls 66a does not pass through the center M of the drilling disc 60a. The drilling teeth 62a can be more easily contacted with the covering bands 12, 29. With respect to the remaining operation of the drilling device 31a provided with the drilling discs 60a, reference is made to the first embodiment.

Next, a third embodiment of the invention will be described, with reference to Figures 10 and 11. The identical parts from the constructive point of view are designated with the same reference signs as in the first embodiment, to which Description is sent in this regard. The different parts from the constructive point of view although similar from the functional point of view are designated with the same reference signs adding the letter b. The essential difference compared to the first embodiment is in the configuration of the drilling discs 60b. The tooth side walls 65b of the drilling teeth 62b are made substantially in the form of a trapezoid. The width BZ of the drilling teeth 62b is reduced in the radial direction, with the drilling teeth 62b having a minimum width BZ at their drilling edges 67b. An imaginary extension V of the front tooth walls 66b does not pass through the center M of the drilling discs 60b. The tooth side walls 66b of a drill tooth 62b enclose an angle between 15 ° and 75 °, and in particular between 30 ° and 60 °. The holes 68b have a maximum width BL, unlike the drill teeth 62b in the area of the drill edges 67b. Since the width BZ of the drilling teeth 62b is reduced in the radial direction, a cutting effect is produced during drilling of the covering bands 12, 29, which facilitates drilling. Regarding the remaining operation of the drilling device 31b provided with the drilling discs 60b, reference is made to the embodiments described above.

Next, a third embodiment of the invention will be described, referring to Figures 12 and 13. The identical parts from the construction point of view are designated with the same reference signs as in the first embodiment, to whose Description is sent in this regard. The different parts from the constructive point of view although similar from the functional point of view are designated with the same reference signs adding the letter c. The essential difference compared to the first embodiment is in the configuration of the drilling teeth 62c. The tooth side walls 65c of the drilling teeth 62c are made triangularly. The front tooth walls 66c of a drilling tooth 62c enclose an angle between them that is between 30 ° and 60 °. An imaginary extension V of the front tooth walls 66c does not pass through the center M of the drilling discs 60c. The width BZ of the drill teeth 62b is reduced in the radial direction, while the width BL of the holes 68c disposed therebetween increases. The drilling edges 67c are made only in the form of points. Thanks to the realization of the drilling edges 67c in the form of points, it is easy to put the drilling teeth 62c in contact with the covering bands 12, 29. Regarding the remaining operation of the drilling device 31c provided with the drilling discs 60c Refer to the embodiments described above.

Regarding the different geometries of the drilling discs 60, 60a, 60b and 60c, a distinction must be made between the immersion force necessary for the drilling and the immersion depth. The flatter the edge arranged outside in the radial direction of a drilling tooth 62, the greater the immersion force necessary for the perforation, so that in principle there is also the danger of a deviation from the cardboard strip corrugated 28. The immersion force is especially large in the drilling discs 60 and 60a. In the drilling disc 60c, the drilling teeth 62c are made so that they end in a pointed outward direction, so that the necessary immersion force is reduced, the immersion depth being for the generation of a perforation of a predetermined length notwithstanding the larger one, so that the degree of injury of the wavy band 9 is also larger. A compromise represents the drilling disc 60b, in the case that, although the drilling teeth 62b converge conically towards the

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outside, the tips are made, however, flattened.

According to another configuration it is possible to make the drilling discs 60 opposite each other, or the drilling discs according to Figures 8, 10 or 12, axially displaced, relative to each other, so that the 5 drilling edges 67 do not they are arranged directly above the other with respect to the corrugated cardboard strip 28, but in a displaced manner relative to each other. In this arrangement it is possible to approximate the two perforation discs 60 more with each other, so that even the perforation edges 67 overlap. In the case of Figure 5, this would mean that the perforation edge 67 of the lower disc 60 is arranged higher than the perforation edge 67 of the upper edge 60. This can compensate for a possible deviation from the

10 corrugated cardboard band 28 in case of too high immersion force. In addition, the axial displacement of the cooperating perforation discs 60 increases the stability of the perforated corrugated cardboard web 28.

Claims (7)

5 fifteen 25 35 Four. Five 55 65 1. Installation of corrugated cardboard for the manufacture of corrugated cardboard sheets, with

to.

at least one production device (7, 27) for producing an endless corrugated cardboard strip (2, 28) from at least one corrugated strip (9) and at least one covering band (12, 29 ),

b.

at least one longitudinal / grooving cutting device (32) for the longitudinal cutting and grooving of the endless corrugated cardboard strip (2, 28) along the working direction (13),

C.

at least one cutting device (40) for cutting corrugated cardboard sheets (39) from the endless corrugated cardboard strip (2, 28) and

d.

at least one control device (54) for controlling the installation of corrugated cardboard (1),

characterized by

and.

at least one drilling device (31; 31a; 31b, 31c) is provided with at least one drilling unit (55, 56) for drilling the at least one covering band (12, 29) at length of work management (13),

F.

the at least one cutting device (40) of the at least one drilling device (31; 31a, 31b; 31c) is then arranged in the working direction (13),

g.

the at least one drilling unit (55, 56) can be rotated around a rotation axis (57, 58) that extends in the transverse direction with respect to the working direction (13) to bring it into contact with the at least one covering band (12, 29),

h.

The at least one drilling device (31; 31a; 31b; 31c) has at least a first drilling unit (55) for drilling a first covering band (12) and at least a second drilling unit (55), opposite to the at least one first perforation unit (55) with respect to the corrugated cardboard strip (2, 28), for the perforation of a second covering band (29).

2.

Corrugated cardboard installation according to claim 1, characterized in that the perforation units (55, 56) have a minimum distance (AP) in each other in the transverse direction with respect to the working direction (13) corresponding at least at 80%, in particular at least 90% and in particular at least 95% of a minimum distance (AD) between the covering bands (12, 29) in the transverse direction with respect to the working direction (13 ).

3.

Corrugated cardboard installation according to claim 2, characterized in that the at least one control device (54) is made such that the minimum distance (AP) between the drilling units (55, 56) can be automatically adjusted depending on the minimum distance (AD) between the covering bands (12, 29).

Four.

Corrugated cardboard installation according to one of claims 1 to 3, characterized in that the at least one perforation unit (55, 56) has at least one perforation disc (60; 60a; 60b; 60c).

5.

Corrugated cardboard installation according to claim 4, characterized in that the at least one perforation disc (60; 60a, 60b, 60c) has several perforation teeth (62; 62a; 62b; 62c) arranged in the circumference and distanced from each other.

6.

Corrugated cardboard installation according to one of claims 1 to 5, characterized in that the at least one perforation device (31; 31a; 31b; 31c) and the at least one longitudinal / grooving cutting device (32 ) are made in an integrated way.

7.

Procedure for the manufacture of corrugated cardboard sheets, with the stages:

to. production of an endless corrugated cardboard strip (2, 28) from at least one corrugated strip

(9)

and at least one covering band (12, 29) by at least one production device (7, 27),

b.

drilling of the at least one covering band (12, 29) by means of at least one drilling device (31; 31a; 31b; 31c), which has at least one drilling unit (55, 56), being cut completely the at least one covering band (12, 29) along a work direction (13) alternately in some sections and not being completely cut in other sections, and

C.

cutting corrugated cardboard sheets (39) from the endless corrugated cardboard strip (2, 28) perforated by at least one cutting device (40),

d.

the at least one cutting device (40) being arranged of the at least one drilling device (31; 31a; 31b; 31c) then in the working direction (13),

and.

the at least one drilling unit (55, 56) being rotatable about an axis of rotation (57, 58) extending in the transverse direction with respect to the working direction (13) to bring it into contact with the minus a covering band (12, 29),

9 F. the at least one drilling device (31; 31a; 31b; 31c) having at least one first drilling unit (55) for drilling a first covering band (12) and at least a second drilling unit (56), opposite the at least one first perforation unit (55) with respect to the corrugated cardboard strip (2, 28), for the perforation of a second covering band 5 (29). 10