Device for producing a three-dimensional packaging product, such as a cushioning product, from a single- or multi-layer paper web

Description

[0001] The invention relates to a device for producing a three-dimensional packaging product, such as a cushioning product, from a single- or multi-layer paper web. Such a production device for paper cushioning products according to the invention comprises a preforming station in which the paper web, which is provided as a fanfold stack source, is formed into a three-dimensional packaging product with at least one crumple cavity extending in the web direction. Furthermore, the generic production device, but also according to the invention, has a rotary cutter connected to the preforming station in the conveying direction of the paper web, which cuts a preformed paper web section from the preformed paper web to the desired length of the packaging product. For this purpose, the rotary cutter has a cutting shaft to which a cutting edge is attached, which rotates on a circular orbit.To improve the cutting process, the rotary cutter may optionally comprise a countershaft to which a cutting pad is attached, which continuously rotates, in particular synchronized with the cutting blade or the cutting edge, so that the cutting edge can engage with the cutting pad during the cutting process.

[0002] This generic cushioning production device, which is to be improved by the present invention, is known from DE 10 2012 018 867 A1. This generic production device has the special effect that the paper forming process, which is carried out by means of two opposing embossing gears, does not need to be interrupted in order to cut the desired, preformed cushioning paper web sections to length. Both preforming and cutting processes can be carried out continuously without interruption, thus increasing production efficiency with the known paper cushioning production device. The lack of a stopping and cutting process also significantly reduces maintenance requirements for the production device.

[0003] In detail, the rotary cutter comprises a cutting blade holder attached to a cutting shaft. The cutting receptacle opposite the cutting blade also comprises a counter shaft to which a cutting pad is attached via a support bracket. Five working disks are provided on both the cutting blade shaft and the counter shaft, which are arranged offset in a transverse direction perpendicular to the conveying direction F or to the axial direction of the respective shaft, so that the working disks of the counter shaft are located between the working disks of the cutting blade shaft. The working disks of the cutting blade shaft have a pair of perforation noses adjacent to the cutting edge, which serve to create perforations in front of and behind the cutting edge of the pre-formed paper web section in the conveying direction in order to fix the edge area of ​​the pre-formed paper section against unfolding.The working discs comprise a straight disc edge extending from one perforation nose and a curved disc edge extending from the other perforation nose. The respective disc edges define the passage channel and, depending on the rotational position, form a wide passage channel whose passage cross-section steadily decreases as the curved disc edge is rotated in. Essentially at the circumferential position diametrically opposite the cutting blade or the circumferential position diametrically opposite the cutting pad, the respective working disc comprises a radial extremum or a radial projection or a radial recess, which serves as a driver for further conveying a severed paper web section.The working discs have proven their worth, particularly since they allow the mass to be kept low, which is necessary for guiding the preformed paper web section to and past the rotary cutter. However, it was found that the interlocking working discs caused crushing of the paper web material, particularly at the point of rotation when driven by the radial high points, which reduced the damping capacity of the preformed paper web section.

[0004] WO 2016 / 075001A1 discloses a device for mechanically manufacturing a filling material product.

[0005] It is an object of the invention to overcome the disadvantages of the prior art, in particular to improve a device for manufacturing a paper cushioning product of the generic type in such a way that higher conveying speeds are achieved through the manufacturing device without increasing the risk of paper jams in the area of ​​the preforming station and the rotary cutter, because in particular the maintenance effort can be kept low and the investment costs for providing the rotary cutting technology within the manufacturing device can be kept low.

[0006] This problem is solved by the features of claim 1.

[0007] According to this, a device is provided for producing a three-dimensional packaging product, such as a cushioning product, from a single- or multi-layer paper web. The production device comprises a preforming station that transforms the paper web into a three-dimensional packaging product with at least one crumple cavity extending in the web direction. Preferably, the preforming station comprises a funnel-like wrapping or rolling device that laterally wraps or rolls the paper web in the transverse direction as it is transported into the production device, so that the longitudinal edges of the paper web, which are provided, for example, by means of a fanfold stacking source, are folded over one another substantially in the center of the paper web.Adjacent to the wrapping or rolling device in the conveying direction is a deformation station with two carrier rollers that interlock in a deformation zone to deform the wrapped or rolled paper web into the cushioning product. This specific cushioning product comprises a substantially central deformation zone extending in the longitudinal direction, to which two hollow crumple zones adjoin in the transverse direction, the lateral ends of which also form the end of the cushioning product. In this respect, a preferred embodiment of the production device according to the invention requires a paper cushioning product with a substantially dumbbell-shaped cross-section. According to the invention, adjoining the preforming station in the conveying direction of the paper web is a rotary cutter that cuts the preformed paper web section from the preformed paper web to the desired length of the packaging product.The rotary cutter has a cutting shaft or knife shaft to which a cutting edge or a knife of the rotary cutter is attached. The rotary cutter is preferably provided with a countershaft, which is arranged in particular parallel to the cutting blade shaft and at the same height in the conveying direction. A cutting pad is attached to the countershaft, into which the cutting edge engages during the cutting process. The cutting edge preferably follows a circular orbit, which is arranged such that it crosses a path of the preformed paper web section through the rotary cutter in order to realize the cutting process. The cutting pad can also follow a circular orbit and is arranged with respect to the orbit of the cutting blade such that a crossing orbit is possible for the necessary engagement of the cutting blade with the cutting pad.

[0008] According to the invention, an attachment is attached to the cutting shaft and / or the countershaft to increase the planar radial extension of the shaft to form a full-surface profile channel wall section, the full-surface profile of which extends in the axial direction of the shaft over at least half the width of the preformed paper web section. Surprisingly, it has been found that, in contrast to working disks with a small contact area, a significant improvement in the conveying performance of the preformed paper web sections through the rotary cutter is achieved when, instead of the narrow working disks, a full-surface enlargement of the planar radial configuration of the shaft toward the conveying path of the preformed paper web section is provided.The resulting full-surface profile channel section achieves full-surface contact with the preformed paper web section before and after cutting by the rotary cutter, thereby ensuring uniform gripping of the paper web section, guidance of the paper web section, and entrainment and further conveyance of the paper web section. Despite the increased friction surface due to the enlargement of the flat contact area, it was shown that a pecking engagement of the preformed paper web section is prevented, thus avoiding paper jams and requiring less conveying force to ensure the conveying flow of the paper web section through the rotary cutter.

[0009] The measure according to the invention forms a profile channel wall section which rotates with the shaft and is essentially passive at the time of rotation or in the rotational position of the engagement of the cutting blade in the preformed paper web section, but when the cutting blade of the rotary cutter leaves the conveying path of the paper web section it comes into full-surface engagement with the paper web section and, on the one hand, takes it along, in particular when a high profile opposite the cutting pad or the cutting blade comes into engagement, and, on the other hand, after the cutting process, in particular upon further rotation by 90°, an essentially flat channel is provided for the paper web section, which occupies the rotary cutter for the next cutting process.

[0010] In a preferred embodiment of the invention, the attachment or the full-surface attachment body is in particular attached exclusively to the countershaft.

[0011] Preferably, the full-surface attachment body, which essentially integrally receives the shaft, extends across the entire width of the preformed paper web section and in particular beyond it to ensure full-surface contact between the attachment and the preformed paper web section. The full-surface outer profile of the attachment extends both over at least half the width of the preformed paper web section and in the circumferential direction from one side of a holder of the cutting edge and / or the cutting pad of the rotary cutter to the opposite side, such that the attachment surrounds the shaft with an encircling amplitude of over 270°. The size of the unengaged area depends on the circumferential width of the holder of the cutting edge and / or the cutting pad.

[0012] In contrast to the working disks arranged at an axial distance from one another, the attachment or the attachment body has a full surface in the axial direction and in the circumferential direction and, in particular, comprises a continuous, steady, jump-free surface profile in both the axial direction and the circumferential direction.

[0013] The rotary cutter preferably has at least one balancing mass, which can in particular be accommodated in the attachment. In a preferred embodiment of the invention, the cutting shaft and / or the countershaft is equipped with a balancing mass such that the cutting shaft and / or the countershaft, in particular the rotary cutter, rotates without imbalance. The cutting shaft and / or the countershaft, together with the components arranged thereon, including a respective balancing mass, can be designed to be radially symmetrical in terms of mass. A balancing mass can be provided opposite the cutting edge (or the cushion) and / or in the attachment.

[0014] Preferred embodiments are specified in the subclaims.

[0015] In a further development of the invention, the attachment body has a longitudinal slot which extends in particular completely from one transverse side in the transverse direction to the opposite transverse side in the axial direction, wherein the longitudinal slot is unchanging in cross-section over the course of the axial direction. The shaft is inserted onto the attachment in the radial direction via the longitudinal slot, depending on whether the attachment is placed on the cutting shaft and / or on the countershaft. The longitudinal slot comprises a contact base extending in the axial direction, against which the shaft rests when inserted. The contact base of the longitudinal slot is preferably and in sections essentially shaped to complement the cylindrical shaft, so that the contact base with the complementary shape can bear positively against the shaft.The shaft does not necessarily have to be cylindrical; sections can also have springs that can engage in grooves in the contact base or vice versa. The contact base determines the position of the shaft, at least in the axial direction. The contact base of the longitudinal slot preferably comprises one or more recesses to simplify the internal connection of the shaft to the attachment body. Preferably, the attachment is glued to the shaft and preferably to a holder for the cutting edge and / or the cutting pad attached to the shaft. The aforementioned plurality of recesses can serve to accommodate a composite material, such as an adhesive.

[0016] To form the longitudinal slot, the attachment body comprises two gripping arms that circumferentially define the longitudinal slot and extend radially away from the shaft when the shaft is inserted. The gripping arms essentially maintain the same access cross-section through the longitudinal slot. Starting at the base of the shaft, the gripping arms firmly grip the shaft and, extending from the base of the shaft, the holder for the cutting and / or cutting pads, forming a positive fit. Particularly good results are achieved when a plastic material and adhesive are used for the attachment.

[0017] In order not to impair the cutting functionality of the rotary cutter, the radial extension of the grippers is less than the radial extension of the cutting pad and / or the cutting edge of the rotary cutter.

[0018] It is clear that the attachment according to the invention can be used on the respective shaft both on the cutting shaft and on the counter shaft.

[0019] In a further development of the invention, the attachment has a full-surface upholstery product outer profile, which is continuously curved, particularly in the axial and circumferential directions, and which is three-dimensionally curved and, in particular, has no profile jumps along its axial and circumferential directions. The upholstery product outer profile is arranged upwards, particularly in the circumferential rotational direction of the shaft, relative to the holder for the cutting edge and / or for the cutting pad of the rotary cutter, which is attached to the shaft.Additionally or alternatively, the cushioning product outer profile comprises at least one profile indentation, preferably two profile indentations, in the case of a dumbbell-shaped cushioning product with two external crumple cavities forming a cushioning curvature and a central deformation strip, at the axial position of the at least one crumple cavity of the packaging product, such that the profile indentation is shaped to match a cushioning curvature formed by the crumple cavity. It should be understood that the adaptation of the profile indentation to the cushioning curvature should not be understood in the sense of shape identity, since the cushioning curvature of the cushioning product is not uniform but depends on the deformation of the paper area.However, the adjustment of the profile indentation should be understood to mean that the cushion curvature formed by the crumple cavity is not significantly changed when accommodated in the profile indentation, and in particular that the cushion is not irreversibly deformed there.

[0020] Preferably, the at least one profile indentation is bounded in the axial direction by radial elevations. It should be understood that a central radial elevation bounds the adjacent profile indentation on one side. Preferably, when two profile indentations are formed, two outer radial elevations are provided, which laterally / axially bound the adjacent profile indentation. The radial elevations are to be designed such that the cushion curvature along the circumference of the cushion product's outer profile is held against axial deflection.

[0021] Preferably, a radial distance of the profile progression of the upholstery product outer profile along the axial direction from the at least one profile indentation and / or the radial elevations, in particular from the entire upholstery product outer profile, decreases continuously in the circumferential direction, in particular in the direction of rotation of the shaft, according to a first circumferential section, starting from a holder fastened to the shaft for the cutting edge and / or the cutting pad of the rotary cutter. According to a second circumferential section of the upholstery product outer profile, adjoining the first circumferential section in the direction of rotation, the radial distance of the profile progression of the upholstery product outer profile increases. The radial distance of the profile progression of the upholstery product outer profile ends, in particular at the end of the second circumferential section, in a radial high point, the profile of which is in turn adapted in the axial direction to the axial profile with the indentations / radial elevations.The radial extension of the radial high point relative to the entire body of the attachment is the greatest. Alternatively or additionally, the radial high point is located at a circumferential distance of 180° to 225° from the cutting edge and / or the cutting pad. The radial high point is not to be understood as a physical point, but rather as an extremum that forms an extremum line along the axial direction.

[0022] The at least one profile indentation extends in the circumferential direction from the holder toward the radial high point, with the radial distance varying. The curvature in the axial direction can preferably remain substantially constant along the circumferential direction of the respective indentation.

[0023] In a further development of the invention, a radial distance of the gripping arms is smaller in the region of the radial elevations compared to the radial distance of the radial high point which is substantially diametrically opposite the gripping arms and in particular is arranged at a circumferential distance of approximately 125° to 225° to the gripping arms and / or is larger in the region of the at least one profile indentation at the lowest point.

[0024] In a further development of the invention, the at least one profile indentation is designed, in particular largely along an axial cross-section, in the shape of a circular segment, in particular with a radius of more than 20 mm, preferably between 40 mm and 50 mm. Preferably, at least one radial elevation, preferably a central radial elevation, is formed circumferentially with a concave depression, the curvature of which is in particular smaller than that of the at least one profile indentation or is circular, in particular with a radius of less than 20 mm or greater than 5 mm, preferably between 10 mm and 20 mm. The aforementioned curvatures refer to the course of the profile indentation in the axial direction.

[0025] In a further development of the invention, the attachment has, in addition to the upholstery product outer profile, another flat, level profile, namely a full-surface channel outer wall that is essentially flat, particularly in cross-section in the axial direction and in the circumferential direction. It should be understood that the flat channel outer wall can certainly have small changes in inclination, which are in particular less than 5° or 10°. The channel outer wall is preferably arranged downwards in the circumferential rotational direction of the shaft relative to the holder for the cutting edge and / or for the cutting pad of the rotary cutter, which holder is fastened to the shaft. The flat channel outer wall can, in particular, extend essentially flatly from a holder for the cutting edge and / or the cutting pad, which holder is fastened to the shaft, to a radial high point, which has already been mentioned above.The radial extent of the radial high point depends in particular on the view of the location in the axial direction and is greatest in relation to the attachment and / or arranged at a circumferential distance of 125° to 190° from the cutting edge and / or from the cutting pad.

[0026] Furthermore, the flat channel outer wall can continuously merge into the cushioning product outer profile, in particular at the circumferential position of the radial high point / radial high point line of the cushioning product outer profile.

[0027] In a further development of the invention, the full-surface body of the attachment has an axial extension of between 50 mm and 1000 mm, in particular between 100 mm and 200 mm, preferably between 120 mm and 180 mm. Of course, the full-surface body can also be adapted to other production devices that have either larger or smaller axial extensions. However, it should be understood that the attachment body should have a full-surface outer profile in order to cover at least 50% of the maximum extension of the preformed paper web section.

[0028] In a further development of the invention, the attachment body is made from a full-surface body piece, in particular from a piece of plastic, for example, polylactide (PLA), in particular injection-molded or manufactured using additive manufacturing, in particular a 3D printing technique. Preferably, the full-surface attachment body is rotationally asymmetrical to the longitudinal axis of the respective shaft and axially symmetrical to an axis parallel to the conveying direction. The aforementioned symmetry and asymmetry relate in particular to the cushioning product's outer profile of the attachment.

[0029] Furthermore, the attachment can be a hollow body with a full surface area at least in the axial direction, the outer surface of which can be profiled in sections, as described above, and is flat. Preferably, the full-surface hollow body comprises an inner honeycomb structure, preferably with square honeycombs, in particular of identical shape.

[0030] In a preferred embodiment of the invention, the attachment is mounted on and secured, in particular glued, to the countershaft to which the cutting pad is attached. The cutting pad simultaneously moves into the conveyor of the preformed paper web in a direction opposite to the direction of rotation of the rotary cutter's cutting blade, with the cutter interacting with the rotating cutting pad during operation. The attachment is attached to the countershaft in such a way that: In a 12 o'clock position (see enclosed figures with top views of the rotary cutter according to the invention; in the 12 o'clock position of the cutting blade, the cutting pad is in a 6 o'clock position; in the 12 o'clock position of the cutting blade, the paper web section is cut off), in particular the above-described flat wall profile, namely the channel outer wall, of the full-surface attachment is perpendicular to the conveying direction of the pre-formed paper web section through the rotary cutter, wherein the flat channel outer wall is upstream with respect to the opposite cushioning product outer profile of the attachment; in a 9 o'clock position (cutting blade rotated by 90° after the cutting process; the cutting pad is also in the 9 o'clock position), the flat channel outer wall forms an inner channel wall which closes off the free space in which the countershaft is arranged and which extends parallel to the conveying direction;with the cutting knife at a 6 o'clock position (a position rotated by 180° with respect to the cutting position; the cutting pad is in a 12 o'clock position), the flat channel outer wall is perpendicular to the conveying direction and downstream of the cushioning product outer profile of the attachment, which is opposite the flat channel outer wall; and / or with the cutting knife at a 3 o'clock position (rotated by 270° with respect to the cutting position, the cutting pad is also in a 3 o'clock position), the cushioning product outer profile of the attachment faces the conveying path of the preformed paper web, while the flat channel outer wall is (passively) facing outwards away from the conveyor belt.

[0031] Further features, characteristics and advantages of the invention will become clear from the following description of a preferred embodiment of the invention with reference to the accompanying drawings, in which: Fig. 1 is a perspective view from the outside of an apparatus according to the invention for producing a three-dimensional packaging product from a single- or multi-layer paper web, namely a cushioning product, wherein the apparatus is provided with the reference number 1 and the cushioning product with the reference number 3. Fig. 2a is a lateral cross-sectional view of the production apparatus for clearly illustrating the deformation station 21 and the rotary cutter 27, wherein different operating situations of the rotary cutter 27 are shown and the course of the rotary movement of the rotary cutter from the actual cut ( Fig. 2a ) until the moment shortly before the cut ( Fig. 2h ) (approx. 25° before the cut); Fig. 3a-a perspective view of the manufacturing device without the Fig. 1shown housing protection parts as well as bearings for the respective shafts of the rotary cutter, whereby different corner positions based on the cutting process ( Fig. 3a ) until the moment shortly before the cut ( Fig. 3h (25° before the cut)); Fig. 4 is a perspective view of the attachment according to the invention for attachment to one of the shafts, namely the cutting blade shaft or the countershaft; Fig. 5 is a cross-sectional view of the attachment, wherein the cross-sectional line through the center is surrounded by the radial elevation; Fig. 6 is an end view of the attachment.

[0032] The cushioning product is shown schematically in the figures. In reality, it does not have an idealized shape, but rather varies in shape depending on the formability of the respective paper. Only the basic design of the cushioning product, with a dumbbell-shaped cross-section, is shown in the drawing. The cushioning product 3 according to the invention has a central deformation strip 5 flanked by two lateral crumple cavities 7 and 11, with the cushioning properties being formed primarily by the crumple cavities 7 and 11. Due to the crumple cavities, the cushioning product assumes a dumbbell shape with the two outer cushioning bulges 13, 15, which later determines the special profiling of the full-surface attachment according to the invention. Depending on the design of the cushioning product 3, one profile side of the attachment can be shaped accordingly.

[0033] The device according to the invention has a preforming station, which is formed by a wrapping and / or rolling device (at 17) not shown in detail, as well as by a deformation device 21, which is arranged in the Figures 2 , 3 can be seen. The deformation device is assigned the reference number 21. The deformation device 21 has two opposing embossing wheels 23, 25, which define a conveying path F towards the rotary cutter 27 at their output. The rotary cutter 27 is arranged next in the conveying direction F and has a cutting blade 31 which defines the conveying path F in a cutting position (12 o'clock position (see Fig. 2)) cuts. The structure of the cutting blade 31, in particular the attachment to the cutting blade shaft 33 and its synchronization with the cutting pad 35, which is attached to a countershaft 37 opposite the cutting blade shaft. The countershaft 37 and the cutting blade shaft 33 are at the same height with respect to the conveying direction F. In the cutting position, the cutting pad 35 is in a 6 o'clock position, as shown in Fig. 2aFurther details regarding the rotary cutter 27 are provided in German patent application DE 10 2012 018 867 A1, which, with regard to the disclosure of the rotary cutter 27 and the associated embossing station, is incorporated into this patent application as a reference. The same applies to the perforation tool used in the preferred embodiment of the invention, which is to be formed by perforation noses 43 and perforation receptacles 41. This perforation tool is described in detail in DE 10 2013 015 875 A1 and is incorporated herein by reference.

[0034] As in the Fig. 2 As can be seen, the respective shafts 33, 37 are driven by a pair of gears 45, 47 to ensure the synchronization of the cutting pad 35 and the cutting blade 31.

[0035] Following the rotary cutter 27, the separated preformed paper web section passes via the initially slightly rectangular conveyor channel 51 to the exit of the production device, which can be closed by a plate 53 to prevent intervention at the exit.

[0036] As in the Figures 2 and 3 As can be seen, an attachment 61 is attached to the countershaft 37. The attachment 61 is glued to the countershaft 37 and to a holder 63 which holds the cutting pad 35.

[0037] The attachment has a honeycomb body manufactured using a 3D printer mold and comprises a base 65, from which two gripping arms, a narrow gripping arm 67 and a stronger gripping arm 71, extend past the countershaft 37 and the holder 63. The gripping arms 67, 71 form a longitudinal slot 73, through which the countershaft 37, including the holder 63, is inserted into the attachment 61. The clear width of the gripping arms 67, 71 of the longitudinal slot is adapted to the holder 63 and the countershaft 37 in such a way that a positive fit is formed there. The longitudinal slot formed by the gripping arms 67, 71 has a contact base 75, which is partially shaped like a cylindrical segment corresponding to the cylindrical shape of the countershaft 37, in order to ensure a secure fit of the attachment 61 on the countershaft 37.

[0038] As especially in the Figures 3As can be seen, the attachment comprises an outer profile 77 for the upholstery product, which is formed particularly in the area of ​​the stronger gripping arm 71. Furthermore, the attachment has a flat channel outer wall 81 opposite the outer profile 77 for the upholstery product, which is assigned to the narrower gripping arm 67. The design of the attachment is described in detail in the Figures 4, 5 and 6 shown.

[0039] The flat channel outer wall 81 is essentially flat and has only a slight change in inclination approximately at the level of the contact base 75 of the longitudinal slot 73.

[0040] The cushioning product outer profile 77 is adapted to the cushioning product 3, which has a dumbbell-shaped cross-section, and has two profile indentations 85, 87, which are delimited in the axial direction X by three radial elevations 91, 93, 95 running in the circumferential direction.

[0041] With reference to the longitudinal axis X, the radial distance r of the upholstery product outer profile decreases in the circumferential course both for the radial elevations 91-95 and for the profile indentations 85, 87 in a first section, whereby after about 90-120° after the first section the radial distance r increases again, which profile is particularly in Figure 2 is evident.

[0042] Even with the flat outer channel wall 81, the radial distance rk first decreases and then increases again.

[0043] The cushion product outer profile 77 starts adjacent to the holder 63 of the cutting cushion 35 and ends in a radial high point or high point line 101, which has the maximum radial distance r max, wherein the radial distance r max is highest at the radial elevations 91-93, which is particularly noticeable in the Figures 4, 5 and 6The area of ​​the radial high point line 101 serves as a conveyor driver with respect to the cut paper web section when the cutting pad 35 is in a 12 o'clock position, compare Figure 2e , is brought. In the manner of a scoop, the attachment with the area of ​​the radial high point line 101 and the flat channel outer wall 81 conveys the cut paper web section towards the exit of the production device 1.

[0044] The radial high point line 101 is not located on the axis of the cutting blade or the center of the cutting pad, but offset in the direction of rotation by about 10-30° compared to a 180° position.

[0045] The central radial elevation 93 comprises a cable recess 103, which can have a radius of 14 mm ± 3 mm, for example. The cross-sectional area (see Figure 6) The circular-segment-shaped profile recess 85, 87 is also circular-segment-shaped and has a radius of 40-50 mm. The preferred width in the axial direction X for the attachment 61 is between 50 and 1000 mm, in particular between about 100-200 mm, preferably between 140 and 160 mm.

[0046] As particularly in Figure 2f , 3f , 2g , 3g , 2h , 3h As can be seen, the attachment 61 according to the invention, which is in full-surface contact with the preformed upholstery product 3 on the side of the upholstery product outer profile, is adapted thereto. Due to the wide upholstery product outer profile 77, the cut upholstery product 3 is easily guided out of the area of ​​the rotary cutter without squeezing the sensitive crumple cavities 7, 11 of the upholstery product 3.

[0047] In contrast to the working disks 111, which are attached to the cutting blade shaft 33, the full-surface attachment 61 cannot form a dust barrier for the preformed paper web section because the latter can slide along the continuous curvature of the attachment's profile. Therefore, it may be preferable to also arrange an attachment 61 in the area of ​​the cutting blade to prevent the paper web section from becoming caught or torn by the working disks 111. However, it has been shown that a significant improvement in paper jam prevention is already achieved through the use of at least one attachment 61.

[0048] The full-surface attachment, for example, is achieved by manufacturing it from a single piece of plastic, with BAL being preferred. Precise manufacturing using a 3D printer has been shown to be advantageous. List of reference symbols

[0049] 1Production device 3Upholstery product 5Deformation strips 7, 11Crumple cavity 13, 15Upholstery curvature 21Deformation station / deformation device 23, 25Embossing wheel 27Rotary cutter 31Cutting knife 33Cutting knife shaft 35Cutting pad 37Counter shaft 41Perforation receptacles 43Perforation noses 45, 47Gear wheel 51Conveyor channel 53Plate 61Attachment 63Holder 65Base 67, 71Gripper arm 73Longitudinal slot 75System floor 77Upholstery product outer profile 81Channel outer wall 85, 87Profile indentations 91, 93, 95Radial elevations 101Radial high point line 103Cable recess 111Working disks RRadial distance FConveyor path / conveying direction XAxial direction

Claims

1. A device (1) for manufacturing a three-dimensional packaging product, such as a cushioning product, from a single or multi-layer paper web, comprising: a preforming station that transforms the paper web into a three-dimensional packaging product with at least one crumple cavity extending in the web direction, and a rotary cutter (27) following the preforming station in the conveying direction (F) of the paper web, which cuts a preformed paper web section to the desired length of the packaging product from the preformed paper web and has a cutting shaft to which a blade of the rotary cutter (27) is attached, and optionally a countershaft (37) to which a cutting pad (35) is attached, into which the blade engages during the cutting process, characterized in that an attachment (61) is fixed to the cutting shaft and / or the countershaft (37) to increase the radial surface extension of the shaft and form a full-surface profile channel wall section, whose full-surface profile extends in the axial direction (X) of the shaft over at least half the width of the preformed paper web section and is designed to form contact with the preformed paper web section before and after cutting by the rotary cutter.

2. The device (1) according to claim 1, characterized in that the attachment (61) has a longitudinal slot through which the shaft is inserted radially into the attachment (61), wherein in particular the longitudinal slot opens into a contact base that is sectionally substantially form-complementary to the cylindrical shaft and / or on which preferably several recesses for receiving a composite material, such as an adhesive, are formed, and / or the attachment (61) particularly comprises two gripping arms extending in the axial direction (X) to form the longitudinal slot, which firmly grip both the shaft and a holder (63) for the blade and / or for the cutting pad (35) forming a form fit, wherein in particular the respective holder (63) protrudes radially beyond the radial extension of the gripping arms.

3. The device (1) according to one of the preceding claims, characterized in that the attachment (61) has a full-surface, particularly in cross-section in the axial direction (X) and in the circumferential direction continuously curved cushioning product outer profile, which is particularly arranged upwardly in the rotational circumferential direction of the shaft relative to a holder (63) for the blade and / or for the cutting pad (35) of the rotary cutter (27) and / or has at least one profile indentation, preferably two profile indentations (85, 87), at the axial position of the at least one crumple cavity of the packaging product, so that the profile indentation (85, 87) is shape-matched to a cushioning bulge formed by the crumple cavity, wherein in particular the at least one profile indentation (85, 87) is axially (X) bounded by radial elevations, particularly so that the radial elevations hold the cushioning bulge along the circumference of the cushioning product outer profile against axial deflection, wherein in particular a radial distance of the profile course of the cushioning product outer profile along the axial direction (X) from the at least one profile indentation (85, 87) and / or the radial elevations, particularly from the entire cushioning product outer profile, starting from a holder (63) attached to the shaft for the blade and / or the cutting pad of the rotary cutter (27) in the circumferential direction, particularly in the rotational direction of the shaft, continuously decreases according to a first circumferential section and continuously increases according to a second circumferential section following the first circumferential section in the rotational direction and / or ends in a radial high point, whose radial extension is greatest in relation to the attachment (61) and / or is arranged at a circumferential distance of 160° to 225° from the blade and / or the cutting pad (35).

4. The device (1) according to claim 3, characterized in that a radial distance of the gripping arms is smaller compared to the radial distance of the radial high point substantially diametrically opposite the gripping arms, particularly arranged at a circumferential distance of about 125° to 225° from the gripping arms, in the area of the radial elevations and / or is larger in the area of the at least one profile indentation (85, 87) at its lowest point.

5. The device (1) according to claim 3 or 4, characterized in that the at least one profile indentation (85, 87) is particularly mostly designed along an axial cross-section in a circular segment shape, particularly with a radius of over 20 mm, preferably between 40 and 50 mm, wherein in particular at least one radial elevation (91, 93, 95), preferably a central radial elevation (91, 93, 95), is formed circumferentially with a concave depression, whose curvature is particularly smaller than that of the at least one profile indentation (85, 87) and / or is circular, particularly with a radius of less than 20 mm and greater than 5 mm, preferably between ten and 20 mm.

6. The device (1) according to one of the preceding claims, characterized in that the attachment (61) has a full-surface, particularly in cross-section in the axial direction (X) and in the circumferential direction substantially flat channel outer wall, which is particularly arranged downwardly in the rotational circumferential direction of the shaft relative to a holder (63) for the blade and / or for the cutting pad (35), wherein in particular the flat channel outer wall extends substantially flat from a holder (63) attached to the shaft for the blade and / or the cutting pad (35) towards a radial high point, whose radial extension is greatest in relation to the attachment (61) and / or is arranged at a circumferential distance of 125° to 190° from the blade and / or the cutting pad (35).

7. The device (1) according to claim 6, characterized in that the flat channel outer wall continuously transitions into the cushioning product outer profile, particularly at the circumferential position of the radial high point of the cushioning product outer profile.

8. The device (1) according to one of the preceding claims, characterized in that the full-surface body of the attachment has an axial extension of between 50 mm and 1000 mm, particularly between 100 mm and 200 mm, preferably between 120 mm and 180 mm.

9. The device (1) according to one of the preceding claims, characterized in that the attachment (61) is made from a full-surface body piece, particularly from a plastic piece, for example, from polylactide (PLA), manufactured, particularly molded or by means of additive manufacturing, particularly a 3-D printing technique, and / or the full-surface attachment body is rotationally asymmetric to the longitudinal axis of the respective shaft and axially symmetric to an axis parallel to the conveying direction (F).

10. The device (1) according to one of the preceding claims, characterized in that the attachment (61) is at least in the axial direction (X) and circumferential direction a full-surface hollow body, whose outer side is sectionally profiled and flat and / or that the inner side preferably has a honeycomb structure, preferably with square honeycombs of identical shape.

11. The device (1) according to one of the preceding claims, characterized in that the profile channel wall section is substantially passive at the rotation time or in the rotational position of the engagement of the blade in the preformed paper web section and, upon leaving the blade of the rotary cutter from the conveying path of the paper web section, comes into full-surface engagement with the paper web section, particularly carrying it along.