DEVICE WITH GUILLOTINE CUTTING DEVICE FOR MANUFACTURING A PACKAGING MATERIAL PRODUCT FROM A FIBER STARTING MATERIAL AND METHOD FOR MANUFACTURING A PACKAGING MATERIAL PRODUCT

Description

[0001] The invention relates to a device for manufacturing a packaging material product from a fibrous starting material, such as a single- or multi-layer paper web or a corrugated board web, in particular made of recycled paper. The invention also relates to methods for manufacturing a packaging material product. Devices of this type are, for example, set up in logistics centers as portable, mobile units to provide pre-cut packaging material products when packaging an item. The term "packaging material strand" can refer in particular to a paper cushion strand, which is obtained from a space-saving single- or multi-layer paper web, especially made of recycled paper, in the form of a roll of material or a zigzag-folded stack of packaging material, also known as a leporello stack.To produce the paper cushioning strand, the paper web is unwound from a roll or a fanfold stack and formed in such a way that air pockets are created, providing cushioning between the item being packaged and the outer packaging. The term "packaging material product" can refer, in particular, to a paper cushioning product, especially of a specific length, that has been cut from a paper cushioning strand. However, the term "packaging material strand" can also refer, in particular, to a corrugated board web. In the case of a corrugated board web, the packaging material product can be a section of the corrugated board web that has been cut from the corrugated board web. For sustainability reasons, corrugated board web sections are preferably also made from recycled paper.

[0002] A device for manufacturing a packaging material product is known, for example, from DE 697 35 564 T2. In this device, a paper web is formed into a three-dimensional packaging material strand via a forming station, and the packaging material strand is given a certain degree of dimensional stability by means of a pair of deformation wheels. Subsequently, packaging material products are cut from the deformation wheel pair by means of a shear cutting arrangement and are then discharged from the device via a safety discharge chute. Conveyor wheels can be provided in the safety chute for conveying the packaging material products.

[0003] A disadvantage of such devices is that the shear cutting arrangement is prone to wear and tear and also leads to the formation of cutting chips. Furthermore, it has been observed that the packaging material strand and the packaged product can become trapped between the cooperating blades of the shear cutting arrangement, potentially causing the device to become clogged. Another disadvantage is that the wear of the shear cutting arrangement necessitates high blade replacement rates to ensure reliable cutting of the packaging material.

[0004] To address these problems of known devices, DE 10 2014 016 874 A1 proposes a generic device for manufacturing a packaging material product. This device comprises a rotary cutter and a pair of conveyor wheels located upstream and downstream of the rotary cutter. To increase the precision of cutting the cushioning material and to reduce wear on the rotary cutter, it is proposed to coordinate the two pairs of conveyor wheels such that the cushioning material is under tension before cutting. This is achieved, in particular, by different conveying speeds of the two pairs of conveyor wheels or by temporarily increasing the distance between them.Furthermore, the risk of blockages occurring in the device was reduced, in particular by a higher conveying speed of the conveyor wheel pair downstream of the rotary cutter in the conveying direction and by a rotary cutter with a scraper device.

[0005] A disadvantage of this type of device is its complexity. Firstly, the use of a rotary cutter with a stripper entails high manufacturing and maintenance costs. Secondly, the established concept requires increased development effort when creating new devices for specific paper materials and specific shapes of packaging products. For example, the kinematics and the forces occurring between the cutter and the stripper during cutting must be considered during the device design phase. Furthermore, the rotating parts of the stripper and the rotary cutter act as dust traps and are susceptible to blockages due to dust accumulation. The elastic stripper also risks becoming porous or losing elasticity if excessive dust accumulates, which can negatively impact the risk of jamming.Another disadvantage is that, if a paper jam occurs despite the proposed measures, it can only be cleared by manual intervention by an operator, which can increase the time required for dust removal and also entails increased safety requirements for the device.

[0006] US Patent 2007 / 117703 A1 discloses a device for producing packaging material in which a cutting device is arranged between two pairs of conveyor wheels, the cutting device having a translationally moving cutting edge. Another device with a cutting device arranged between two pairs of conveyor wheels is known from US Patent 6,168,560 B1.

[0007] The object of the invention is to overcome the disadvantages of the prior art, in particular to provide a device for manufacturing a packaging material product from a fiber starting material and a method for manufacturing a packaging material product, wherein the development, manufacturing and / or maintenance costs for the device are reduced and the risk of blockage and / or dust deposition in the device is not increased, in particular reduced, and / or dust removal is facilitated, in particular made safer.

[0008] This problem is solved by the subject matter of independent claim 1. According to the present invention, the device for manufacturing a packaging material product from a fiber starting material, such as a single- or multi-layer paper web or a corrugated board web, in particular from recycled paper, comprises a cutting device for separating the packaging material product from a packaging material strand, such as a corrugated board web or a three-dimensional paper cushion strand formed in the device from the fiber starting material. Furthermore, according to the invention, a feed wheel pair arranged upstream of the cutting device in the conveying direction for conveying the packaging material strand and a discharge wheel pair arranged downstream of the cutting device in the conveying direction for conveying the packaging material strand are provided.

[0009] The packaging material is made primarily from recycled paper. Recycled paper is defined as paper materials with a low proportion (less than 50%) of virgin fiber paper. Paper materials containing 70% to 100% recycled paper are particularly preferred. The recycled paper used in this invention should be paper material that has a tensile strength index along the machine direction of no more than 90 Nm / g, preferably a tensile strength of 15 Nm / g to 60 Nm / g, and a tensile strength index transverse to the machine direction of no more than 60 Nm / g, preferably a tensile strength of 5 Nm / g to 40 Nm / g. The tensile strength and the tensile strength index can be determined according to DIN EN ISO 1924-2 or DIN EN ISO 1924-3. Alternatively, or in addition, the properties of recycled paper can be characterized by its burst resistance.For the purposes of this definition, a material is recycled paper with a burst index of at most 3.0 kPa*m^2 / g, preferably with a burst index of 0.8 kPa*m^2 / g to 2.5 kPa*m^2 / g. The burst index is determined according to the standard DIN EN ISO 2758. Furthermore, the packaging material has a basis weight of, in particular, 40 g / m^2 to a maximum of 140 g / m^2. The fiber starting material can be, in particular, a single- or multi-ply paper web or a corrugated board web. The fiber starting material can also be in the form of a roll of material or a zigzag-folded stack of packaging material, also known as a leporello stack.

[0010] In particular, the device described in connection with the present invention relates to a cushioning material production device. A cushioning material production device is understood to be, in particular, a device in which a three-dimensional cushioning strand, especially a three-dimensional paper cushioning strand, is produced from a single- or multi-layer web of starting material, in particular from a single- or multi-layer paper web.

[0011] Preferably, the device is a device for manufacturing a packaging material product in the form of a three-dimensional paper cushioning product. A single- or multi-layer paper web is preferably formed into a paper cushioning strand, and the paper cushioning product is then cut from the paper cushioning strand using a cutting device. A forming device is preferably provided for the forming into the paper cushioning strand, which is preferably arranged upstream of the feed wheel pair in the conveying direction. The forming device can, for example, be a funnel-shaped wall section of the device that tapers towards the feed wheel pair in the conveying direction. Alternatively or additionally, a separate forming device, such as a forming funnel, can be attached to the device and / or to the funnel-shaped wall section of the device upstream of the feed wheel pair in the conveying direction.Alternatively or additionally, a forming device can be provided downstream of the cutting device in the conveying direction. Such a forming device arranged downstream of the cutting device can, for example, be designed by a funnel-shaped wall section of the device that tapers in the conveying direction. Preferably, a forming device arranged downstream of the cutting device is positioned between the cutting device and the conveying impeller pair, and in particular connects to the conveying impeller pair in the conveying direction.

[0012] Furthermore, the cutting device preferably comprises a guide that directs the cutting edge in such a way that it cuts through the material cushion strand translationally during the cutting engagement. The cutting engagement refers in particular to the point in time when the cutting edge enters the material strand. Particularly preferably, the cutting edge enters the material strand to its entire depth during the cutting engagement. This means, in particular, that the cutting edge runs straight through the depth, and especially that the tip of the cutting edge extends at a cutting direction height. By having the cutting edge enter to its entire depth during the cutting engagement, it can be ensured, in particular, that the packaging material strand is cut as uniformly as possible, and especially simultaneously, over its entire depth.This reduces, and preferably prevents, the tearing of the paper cushion strand during separation.

[0013] Depth direction refers in particular to the direction that runs transversely, especially orthogonally, to the cutting direction and the conveying direction.

[0014] Tearing occurs particularly when the material strand is subjected to tension before being cut. For example, cutting can be achieved simply by applying high tension, causing the material strand to tear. However, tearing produces more dust than cutting with a blade, which should be avoided, especially for safety and maintenance reasons. But even when cutting with a blade, the packaging material strand can tear to some extent. For example, tearing occurs when the packaging material strand is put under tension before being cut and the blade, as in scissor cutting, plunges into the material strand from one side and cuts through the material in the depth direction.As the cutting process progresses, particularly in the depth direction, tension in the packaging material strand can cause the uncut section to tear. Therefore, by ensuring the cutting edge engages the material strand as deeply as possible, along its entire depth, dust formation can be significantly reduced. The translational cutting action of the packaging material strand, perpendicular to the conveying direction, applies a cutting force to the strand. This cutting force can preferably, especially before the actual cutting action, cause tension in the packaging material strand between the conveyor wheel pairs.Particularly in designs where the cutting edge is shaped and / or guided in such a way that it penetrates the entire depth of the paper cushioning strand uniformly, and especially simultaneously, the cutting force applied to the paper cushioning strand before the actual cutting action can be increased, thus increasing the tension of the packaging material strand. Compared to rotary cutters or scissor-like cooperating cutting edges, a translationally guided cutting edge transverse to the conveying direction has the advantage that the applied force also acts transversely to the conveying direction, preferably orthogonally to the conveying direction, on the packaging material strand and tensions it between the conveyor wheel pairs.

[0015] It has proven particularly advantageous for the cutting edge to move purely translationally from a cutting start position to a cutting end position during the process.

[0016] The cutting edge preferably cuts and / or passes through the packaging material strand and / or the conveyor channel transversely, preferably orthogonally, to the packaging material strand extending between the conveyor wheel pairs. Furthermore, it has proven advantageous to design the cutting device without a counter blade. This can reduce development and maintenance costs for the device, as the interaction of the cutting edge and counter blade generally requires adherence to tight tolerances. This also increases the requirements for guiding the cutting edge and / or counter blade relative to each other, so that cutting without a counter blade further reduces manufacturing and maintenance costs. Moreover, the use of a counter blade can increase wear on the cutting edges.Furthermore, the close interaction between the cutting and counter-cutting edges can lead to an increased occurrence of packaging material blockages. By cutting the packaging material strand transversely to the conveying direction, the counter-cutting edge can be compensated for by clamping the strand. Since clamping the packaging material strand facilitates the cutting process, the requirements for cutting edge quality are reduced. This allows for the use of less expensive cutting edges, for example, those with lower hardness, without reducing cutting edge service life, thus lowering manufacturing and maintenance costs for the device.

[0017] As the cutting edge inevitably wears down over time, the ratio between cutting and tearing during the separation of the packaging material can shift towards tearing, which can particularly promote dust formation. A key advantage of using cutting teeth is that their tapered shape ensures penetration into the packaging material strand even with a dull cutting edge. This prevents the need to excessively increase tension in the packaging material strand to maintain separation, thus avoiding excessive dust formation.The use of cutting serrations allows, in particular, for penetration into the packaging material strand along the entire depth of the cutting action, thus enabling virtually dust-free cutting, especially with new, sharp cutting edges. Furthermore, compared to a smooth cutting edge, the serrations allow penetration into the paper cushioning strand even with stepped cutting edges, resulting in a virtually dust-free cutting process.

[0018] According to the invention, the device comprises a conveying channel extending at least to the conveying height of the cutting device in the conveying direction, which is bounded by a boundary wall. Furthermore, according to the present invention, the device comprises a gap formed in the boundary wall, which is configured such that a cutting edge of the cutting device can move into and out of the gap without contact. Contactless entry and exit into the gap means, in particular, that the cutting edge remains free of contact with the counter edges that bound the gap in the conveying direction.

[0019] Preferably, the gap is formed at the conveying direction height of the cutting device.

[0020] Particularly preferably, the gap is designed such that the cutting edge can cut the packaging material strand translationally during the cutting action, in particular a purely translational process from a cutting start position to a cutting end position, and can move in and out of the gap without contact, in particular the cutting tip of the cutting edge can leave the conveying channel without contact.

[0021] The gap is, in particular, an elongated opening. This means, in particular, that the extent of the gap in one longitudinal direction is significantly greater than in the other directions. The longitudinal direction of the gap corresponds, in particular, to the depth direction. Specifically, the gap extends in the depth direction by at least 200%, 300%, 400%, or 500% of the gap extent in the cutting direction and in the conveying direction. In particular, the gap extends in the depth direction over at least 60%, 80%, 90%, or 95%, and in particular at least 100%, of the extent of the conveying channel, the cutting edge, the upstream wall section, and / or the downstream wall section in the depth direction. In the conveying direction, the gap extends, in particular, between the upstream and downstream counter edges.In the cutting direction, the gap extends, in particular, between the boundary surface of the boundary wall facing the conveying channel, specifically the boundary surface of the upstream wall section that bounds the conveying channel in the cutting direction, and the surface of the boundary wall facing away from the conveying channel, specifically the outer surface, specifically the surface of the downstream wall section that bounds the conveying channel in the cutting direction. In particular, the gap extends in the cutting direction and / or conveying direction by a maximum of 50%, 30%, 20%, or 10% of the gap's depth. The term "entering the cutting edge into the gap" refers specifically to the process of the cutting edge extending in the cutting direction beyond the boundary surface of the boundary wall facing the conveying channel, specifically the upstream wall section that bounds the conveying channel in the cutting direction.The term "exiting the cutting edge from the gap" refers in particular to the movement of the cutting edge in the cutting direction beyond the outer surface of the boundary wall facing away from the conveying channel, especially the downstream wall section that defines the conveying channel in the cutting direction. The gap extent in the cutting direction can be increased, in particular, by offsetting the downstream counter edge relative to the upstream counter edge in the cutting direction. The cutting edge is considered to be moving out of the conveying channel, in particular, when the cutting edge, especially the cutting tip, extends beyond the boundary wall that defines the conveying channel in the cutting direction, especially the boundary surface of the upstream and / or downstream boundary wall facing the conveying channel in the cutting direction.

[0022] The conveying height of the cutting device refers in particular to the height in the conveying direction at which the cutting edge, especially the cutting tip, of the cutting device is engaged in cutting the packaging material strand. Preferably, the cutting edge moves purely translationally in the cutting direction at the conveying height of the cutting device, the cutting direction preferably being transverse, and in particular orthogonal, to the conveying direction. The conveying channel at the conveying height of the cutting device extends in the conveying direction, in particular downstream and upstream of the cutting edge, and most preferably at least to the pairs of conveying wheels. The conveying channel is in particular bounded by the boundary wall. Preferably, the boundary wall completely surrounds the conveying channel upstream and / or downstream of the cutting device.This means, in particular, that the conveying channel is open in the conveying direction and bounded, or in particular enclosed, by the boundary wall in the cutting direction and in the depth of the device. For example, the boundary wall can have opposing wall sections in the cutting direction and / or in the depth direction that define the conveying channel. However, the conveying channel does not necessarily have to be enclosed by the boundary wall. It can, for example, also be formed by two opposing walls, in particular parallel to each other, in the cutting direction or in the depth direction, while the conveying channel is open in the other direction. It is particularly preferred that the conveying channel is bounded by opposing upper and lower wall sections, preferably extending parallel to each other, which define the conveying channel in the depth direction.Preferably, the upper and lower wall sections extend in the conveying direction between the conveying wheel pairs, in particular at least from the infeed wheel pair to the outfeed wheel pair. Preferably, the cutting edge is guided in the conveying direction over the upper and lower wall sections, particularly at the level of the cutting device, and especially when transitioning from a cutting start position to a cutting end position.

[0023] In particular, the boundary wall comprises an upstream wall section. Specifically, the conveying channel is bounded upstream of the gap in the conveying direction by the upstream wall section, which has an upstream counter-edge that limits the gap in the conveying direction. Specifically, the upstream wall section bounds the conveying channel in the cutting direction. Specifically, the upstream wall section extends from the gap in the opposite direction to the conveying direction and in the depth direction. Specifically, the upstream wall section extends from the gap in the opposite direction to the conveying direction by at least 40%, 60%, 80%, or 100% of the distance between the gap and one, and in particular both, axes of rotation of the feed impeller pair in the conveying direction.In particular, the upstream wall section extends in the depth direction by at least 100%, 120%, 140%, 160%, 180%, or 200% of the depth-directed extension of the feed impeller pair. In particular, the upstream wall section extends in the depth direction by at least 60%, 80%, 100%, 120%, or 140% of the depth-directed extension of the packaging material strand. In particular, the upstream wall section extends in the depth direction and in the direction opposite to the conveying direction such that exit of the packaging material strand from the conveying channel in the cutting direction between the gap and the feed impeller pair is prevented. In particular, the upstream wall section limits the conveying channel in the cutting direction such that entanglement of the packaging material strand with the axes of rotation of the feed impeller pair is prevented.In particular, the axes of rotation of the feed impeller pair are arranged outside the conveying channel. Specifically, the upstream wall section, which delimits the conveying channel in the cutting direction, extends across the entire surface in the depth direction and in the direction opposite to the cutting direction. For example, the upstream wall section can extend as a continuous wall across at least 40%, 60%, 80%, or 100% of the width of the conveying channel in the depth direction and, extending from the gap in the direction opposite to the conveying direction, across at least 40%, 60%, 80%, or 100% of the distance between the gap and the axes of rotation of the feed impeller pair.

[0024] In particular, the boundary wall comprises two upstream wall sections opposite each other in the cutting direction. Specifically, a first of the two upstream wall sections is configured according to one or more of the features described above. Specifically, the second of the two upstream wall sections bounds the conveying channel in the direction opposite to the cutting direction. Specifically, the second upstream wall section is configured according to one or more of the features of the upstream wall section described above. Specifically, the two upstream wall sections are spaced apart in the cutting direction by at least 100%, 120%, or 150% and / or by at most 400%, 300%, 250%, or 200% of the length of the packaging material strand in the cutting direction. Specifically, the two upstream wall sections extend in the cutting direction between the axes of rotation of the feed impeller pair.

[0025] In particular, the conveying channel is bounded in the conveying direction between the axes of rotation of the feed impeller pair and the gap by the two upstream wall sections. Specifically, two upstream wall sections extend in the conveying direction and in the depth direction over such a large area that they prevent the packaging material strand from exiting the conveying channel. The conveying channel is formed, in particular, by the space through which the packaging material strand passes between the feed impeller pair and the discharge impeller pair during the production of the packaging product. The conveying channel extends, in particular, over at least 100%, 120%, 140%, or 160% of the length of the packaging material strand in the cutting direction and in the depth direction.In particular, the conveying channel extends in the cutting direction at most over the extent of the feed wheel pairs, preferably over less than 100%, 90% or 80% of the extent of both feed wheels of the feed wheel pair in the cutting direction.

[0026] In a preferred embodiment, the conveying channel is additionally bounded by two upstream upper and lower wall sections opposing each other in the depth direction. The upper and lower wall sections can, in particular, provide guide surfaces for the cutting edge. Furthermore, the upper and lower wall sections can be used as mounting walls for attaching the feed impeller pair. Specifically, the upper and lower upstream wall sections bound the conveying channel in the depth direction. The upstream upper and lower wall sections can, in particular, connect in the depth direction to the upstream wall section, or especially to both upstream wall sections, that bound the conveying channel in the cutting direction.In particular, the conveying channel can be bounded by three upstream wall sections that form a U-shaped boundary wall upstream of the gap, specifically by one wall section bounding the conveying channel in the cutting direction and two wall sections bounding the conveying channel in the depth direction. Most preferably, the conveying channel is bounded by four upstream wall sections that form a substantially closed profile cross-section upstream of the gap. In particular, the four upstream wall sections form an angular, especially rectangular, upstream boundary wall that substantially encloses the conveying channel upstream of the gap in both the cutting and depth directions.In this context, "essentially" means, in particular, that the boundary wall encloses at least 70%, 80%, 90%, or 95% of the conveying channel between the feed impeller pair and the gap in both the depth and cutting directions. It is particularly preferred that the conveying channel between the feed impeller pair and the gap be 100% enclosed by the upstream boundary wall in both the depth and cutting directions. Preferably, the gap, especially in directions orthogonal to the cutting direction, is designed such that the packaging material strand and / or the packaging product do not become jammed in the gap. The following described configurations of the gap have proven advantageous in preventing this.

[0027] According to an advantageous embodiment of the present invention, the conveying channel is bounded upstream of the gap in the conveying direction by an upstream wall section which has an upstream counter edge limiting the gap upstream in the conveying direction.

[0028] The upstream counter edge differs from a counter blade in particular in that it maintains a minimum distance of at least 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 1.0 mm, 2 mm, 3 mm, or 5 mm when the cutting edge moves into and out of the gap. Depending on the tension under which the packaging material strand is subjected during cutting, and / or the sharpness of the cutting edge, and / or the design of the conveying channel, the counter edge preferably differs from a counter blade in that the packaging material strand is in no contact with the upstream counter edge when the packaging material product is separated. Particularly with blunt cutting edges, the upstream counter edge can preferably also form a support edge that assists in the separation process.Alternatively or additionally, the distance in the conveying direction and in the opposite direction between the cutting edge and the upstream and / or downstream counter edge is selected such that cutting residue adhering to the cutting edge is scraped off at the upstream and / or downstream counter edge when the cutting edge is retracted into the gap, particularly into the conveying channel. This, in particular, further reduces the accumulation of cutting residue in the conveying channel.

[0029] An edge is understood to be, in particular, a line formed by two abutting planes. Specifically, an edge extends substantially in one edge direction, namely in the direction of the theoretical two-dimensional line formed by the two abutting planes. In particular, an edge can be a rounded transition surface between the two abutting planes. A counter edge is understood to be, in particular, an edge or a section of an edge that remains non-contacting with the cutting edge when the cutting edge enters and exits the gap. The direction (edge ​​direction) in which the upstream counter edge extends is, in particular, the depth direction. Specifically, the upstream counter edge extends in the depth direction by at least 40%, 60%, 80%, 90%, or 95%, and in particular by at least 100%, of the conveying channel.In particular, the upstream counter-edge extends over the entire length of the upstream wall section in the depth direction, which bounds the conveying channel in the cutting direction. Specifically, the upstream counter-edge is formed by a boundary surface of the upstream wall section facing the conveying channel, which bounds the conveying channel in the cutting direction, and by the end face of the upstream wall section facing the gap, which bounds the conveying channel in the cutting direction. In particular, the end face of the upstream wall section facing the gap and the boundary surface of the upstream wall section facing the conveying channel extend in the depth direction by at least 40%, 60%, 80%, 90% or 95%, in particular by at least 100%, of the conveying channel and / or by at least 40%, 60%, 80%, 90% or 95%, in particular by at least 100%, of the extension of the cutting edge in the depth direction.

[0030] According to an advantageous embodiment of the present invention, the cutting edge is spaced from the upstream counter edge when entering and exiting the gap in the conveying direction. Preferably, the distance is 0.1 mm to 50 mm, 0.5 mm to 30 mm, or 1.0 mm to 15 mm. Particularly preferred is the distance between the cutting edge and the upstream counter edge in the conveying direction when entering and exiting the gap, especially over the entire travel path from a cutting start position to a cutting end position.

[0031] Furthermore, it is preferred that the cutting edge, when entering and exiting the gap, extends beyond the upstream counter edge, particularly in the cutting direction. The cutting edge preferably extends 0.1 to 200 mm, 0.5 to 100 mm, or 5.0 to 50 mm beyond the upstream counter edge.

[0032] In a further advantageous embodiment of the present invention, the conveying channel is bounded downstream of the gap in the conveying direction by a downstream wall section. The downstream wall section preferably has a downstream counter-edge that limits the gap in the conveying direction.

[0033] In particular, the boundary wall comprises a downstream wall section. Specifically, the conveying channel is bounded downstream of the gap in the conveying direction by the downstream wall section, which has a downstream counter-edge that limits the gap in the conveying direction. Specifically, the downstream wall section bounds the conveying channel in the cutting direction. Specifically, the downstream wall section extends from the gap in the conveying direction and in the depth direction. Specifically, the downstream wall section extends from the gap in the conveying direction by at least 40%, 60%, 80%, or 100% of the distance between the gap and one, in particular both, axes of rotation of the conveying impeller pair in the conveying direction. Specifically, the downstream wall section extends in the depth direction by at least 100%, 120%, 140%, 160%, 180%, or 200% of the depth direction of the conveying impeller pair.In particular, the downstream wall section extends in the depth direction by at least 60%, 80%, 100%, 120%, or 140% of the length of the packaging material strand in the depth direction. In particular, the downstream wall section extends in the depth direction and in the conveying direction such that exiting the conveying channel in the cutting direction between the gap and the conveying impeller pair is prevented. In particular, the downstream wall section limits the conveying channel in the cutting direction such that entanglement of the packaging material strand with the axes of rotation of the conveying impeller pair is prevented. In particular, the axes of rotation of the conveying impeller pair are arranged outside the conveying channel. In particular, the downstream wall section that limits the conveying channel in the cutting direction extends across the entire surface in the depth direction and in the direction opposite to the cutting direction.For example, the downstream wall section can extend as a continuous wall over at least 40%, 60%, 80% or 100% of the width of the conveying channel in the depth direction and, starting from the gap in the conveying direction, over at least 40%, 60%, 80% or 100% of the distance between the gap and the axes of rotation of the feed wheel pair.

[0034] In particular, the boundary wall comprises two downstream wall sections opposite each other in the cutting direction. Specifically, a first of the two downstream wall sections is configured according to one or more of the features described above. Specifically, the second of the two downstream wall sections bounds the conveying channel in the direction opposite to the cutting direction. Specifically, the second downstream wall section is configured according to one or more of the features of the downstream wall section described above. Specifically, the two downstream wall sections are spaced apart in the cutting direction by at least 100%, 120%, or 150% and / or by at most 400%, 300%, 250%, or 200% of the length of the packaging material strand in the cutting direction. Specifically, the two downstream wall sections extend in the cutting direction between the axes of rotation of the conveying wheel pair.

[0035] In particular, the conveying channel is bounded in the conveying direction between the axes of rotation of the conveying wheel pair and the gap by the two downstream wall sections. Specifically, two downstream wall sections extend in the conveying direction and in the depth direction over such a large area that they prevent the packaging material strand from exiting the conveying channel. Specifically, the conveying channel extends in the cutting direction at most over the extent of the conveying wheel pair, preferably over less than 100%, 90%, or 80% of the extent of both conveying wheels of the conveying wheel pair in the cutting direction.

[0036] In a preferred embodiment, the conveying channel is additionally bounded by two upper and lower wall sections opposing each other in the downstream direction. The upper and lower wall sections can, in particular, provide guide surfaces for the cutting edge. Furthermore, the upper and lower wall sections can be used as mounting walls for attaching the conveying wheel pair. Specifically, the upper and lower downstream wall sections bound the conveying channel in the downstream direction. The downstream upper and lower wall sections can, in particular, connect in the downstream direction to the downstream wall section, or especially to both downstream wall sections, that bound the conveying channel in the cutting direction.

[0037] In particular, the downstream upper and lower wall sections can merge seamlessly. Specifically, the downstream upper and lower wall sections can merge seamlessly into the upstream upper and lower wall sections at the conveying height of the cutting device. Specifically, upper and lower wall sections can each extend as a continuous wall from the feed impeller pairs to the discharge impeller pair, thereby forming the upstream and downstream upper and lower wall sections. Specifically, the upstream and downstream wall sections can merge seamlessly in the depth direction. Specifically, the upstream and downstream upper and / or lower wall sections can each be formed in one piece.

[0038] In particular, the conveying channel can be bounded by three downstream wall sections that form a U-shaped boundary wall downstream of the gap, specifically by one wall section that bounds the conveying channel in the cutting direction and two wall sections that bound the conveying channel in the depth direction. Most preferably, the conveying channel is bounded by four downstream wall sections that form a substantially closed profile cross-section downstream of the gap. In particular, the four downstream wall sections form an angular, especially rectangular, downstream boundary wall that substantially encloses the conveying channel downstream of the gap in both the cutting and depth directions.In this context, "essentially" means that the boundary wall encloses the conveying channel between the conveying impeller pair and the gap to at least 70%, 80%, 90%, or 95% in both the depth and cutting directions. It is particularly preferred that the conveying channel between the conveying impeller pair and the gap is 100% enclosed by the downstream boundary wall in both the depth and cutting directions.

[0039] Furthermore, it is advantageous that the cutting edge is spaced from the downstream counter edge when entering and exiting the gap in the conveying direction. The distance is particularly preferably 0.1 mm to 200 mm, 0.5 mm to 100 mm, or 5.0 mm to 50 mm. Particularly preferably, the distance between the cutting edge and the upstream counter edge is constant in the conveying direction when entering and exiting the gap, especially over the entire travel path from a cutting start position to a cutting end position.

[0040] In an advantageous embodiment, the cutting edge extends beyond the downstream counter edge in the cutting direction when entering and exiting the gap. Preferably, the cutting edge extends beyond the downstream counter edge by 0.1 to 150 mm, 0.5 to 70 mm, or 5.0 to 30 mm.

[0041] The direction (edge ​​direction) in which the downstream counter edge extends is, in particular, the depth direction. Specifically, the downstream counter edge extends in the depth direction by at least 40%, 60%, 80%, 90%, or 95%, and in particular by at least 100%, of the conveying channel. Specifically, the downstream counter edge extends over the entire depth-directed extent of the downstream wall section that bounds the conveying channel in the cutting direction. Specifically, the downstream counter edge is formed by a boundary surface of the downstream wall section facing the conveying channel and by the end face of the downstream wall section facing the gap.In particular, the end face of the downstream wall section facing the gap and the boundary surface of the downstream wall section facing the conveying channel extend in the depth direction by at least 40%, 60%, 80%, 90% or 95%, in particular by at least 100%, of the conveying channel and / or by at least 40%, 60%, 80%, 90% or 95%, in particular by at least 100%, of the extension of the cutting edge in the depth direction.

[0042] It has proven advantageous for the downstream counter edge to be offset relative to the upstream counter edge in the cutting direction. Preferably, the offset is 0.1 mm to 200 mm, 0.1 mm to 100 mm, 0.1 mm to 50 mm, 0.5 mm to 30 mm, or 5 mm to 10 mm. Alternatively or additionally, the downstream counter edge and the upstream counter edge are offset from each other such that the packaging material strand and / or the packaging material product remain free of contact with the downstream wall section, in particular the downstream counter edge, when the packaging material product is cut off.

[0043] It has proven particularly advantageous if the cutting edge extends out of the conveying channel when entering and exiting the gap. Preferably, the cutting edge extends out of the conveying channel in such a way that any dust and / or chips generated during cutting are ejected from the conveying channel. Alternatively or additionally, the cutting edge can protrude from the conveying channel by 0.1 to 150 mm, 0.5 to 70 mm, or 5.0 to 30 mm in a cutting end position. This means, in particular, that the end of the cutting edge, especially the cutting tip, protrudes from the conveying channel by 0.1 to 150 mm, 0.5 to 70 mm, or 5.0 to 30 mm. This distance is measured, in particular, between the end of the cutting edge, especially the cutting tip, and the boundary surface of the downstream boundary wall facing the conveying channel, especially the downstream counter edge.Alternatively or additionally, in a cutting end position, the cutting edge can protrude 0.1 mm to 200 mm, 0.5 mm to 100 mm or 5.0 mm to 50 mm beyond the upstream counter edge in the cutting direction.

[0044] The previously described design of the gap makes it possible in particular to ensure that dust and chips generated during cutting are largely conveyed out of the conveying channel and, at the same time, cutting residues and chips adhering to the cutting edge are scraped off at the boundary wall, in particular at at least one counter edge, when re-entering the gap, especially the conveying channel.

[0045] According to the invention, the gap is formed in the boundary wall such that the cutting edge engages with the packaging material strand before entering the gap. Preferably, the packaging material product is separated from the packaging material strand before the cutting edge enters the gap. This reduces the risk of the packaging material product or the packaging material strand becoming trapped in the gap. This can be achieved, in particular, by designing the conveying channel in the cutting direction such that the packaging material strand is held at a distance from the boundary wall, especially from the gap, between the conveying wheel pairs.Alternatively or additionally, the packaging material strand can be tensioned before cutting, so that the packaging material strand is pressed in the cutting direction at most to just before the gap under the influence of the force exerted on the packaging material strand by the cutting edge.

[0046] In a preferred embodiment of the present invention, the device comprises a retraction gap formed in the boundary wall, which is configured such that the cutting edge can move in and out of the conveying channel, particularly without contact. Preferably, the retraction gap is formed on a section of the boundary wall opposite the gap in the cutting direction. Particularly preferably, the retraction gap and / or the opposite section of the boundary wall is configured like the gap and / or like the wall sections surrounding the gap. Preferably, the cutting edge is guided such that the cutting edge, in particular the cutting tip, is arranged outside the conveying channel in a cutting start position, which the cutting edge assumes particularly before the paper cushioning product is separated.

[0047] Preferably, the cutting tip extends in the opposite direction to the cutting direction above a counter edge of the upstream section of the boundary wall that limits the retraction gap. This ensures, in particular, that the paper cushion strand does not get caught on the cutting edge during conveying and discharge. The design of the retraction gap and the sections of the boundary wall that limit the retraction gap, as described above, means that the previously described distances between the cutting edge and the upstream and downstream counter edges of the gap are preferably maintained during entry into and exit from the gap and / or the conveying channel, also with regard to the retraction gap.

[0048] Particularly preferred is the retraction gap and the gap in the boundary wall designed such that, during the process from a cutting start position to a cutting end position, the cutting edge can retract into the conveying channel via the retraction gap and, in particular, can exit the conveying channel via the gap on a side opposite the cutting direction. Alternatively or additionally, the retraction gap and the gap in the boundary wall are designed such that, during the process from a cutting start position to a cutting end position, the cutting edge first retracts into the conveying channel via the retraction gap, engages in cutting with the packaging material strand in the conveying channel, and exits the conveying channel via the gap.Furthermore, the retraction gap and the gap are alternatively or additionally designed in the boundary wall in such a way that the cutting edge can extend from a cutting end position to a cutting start position via the retraction gap out of the conveying channel.

[0049] For this purpose, the retraction gap and the gap are preferably positioned opposite each other, and in particular aligned with each other in the cutting direction. Particularly preferably, the gap and the retraction gap extend parallel to each other and / or form a through-gap extending transversely to the conveying direction, in particular orthogonally to the conveying direction, interrupting the boundary wall, especially in the cutting direction and in the direction opposite to the cutting direction. Preferably, during the process, the cutting edge moves in and out of the through-gap without contact, from a cutting start position to a cutting end position.

[0050] When forming the gap and / or the retraction gap, it is particularly advantageous if it is bounded both upstream and downstream of the cutting edge by a counter edge. A particular advantage of counter edges formed on both sides of the gap and / or the retraction gap is that cutting residue and / or cutting chips adhering to the cutting edge can be scraped off when re-entering the gap and / or the retraction gap.

[0051] Preferably, the cutting edge can be fully extended from the conveying channel section adjoining the cutting edge in the conveying direction via the retraction gap.

[0052] In a preferred embodiment, the retraction gap extends transversely, preferably orthogonally, to the conveying direction and / or the cutting direction.

[0053] In a preferred embodiment, the gap extends transversely, preferably orthogonally, to the conveying direction and / or the cutting direction.

[0054] In an advantageous embodiment of the present invention, the feed wheel pair, the discharge wheel pair, and the cutting device are coordinated such that the packaging material strand is under tension, particularly during the cutting of the packaging material product. This can be achieved, for example, by ensuring that the packaging material strand remains under tension throughout its conveying journey between the feed wheel pairs. This can also be achieved, for example, by the discharge wheel pair imparting a higher conveying speed to the paper cushion strand than the feed wheel pair. However, this embodiment can lead to increased slippage and thus to increased dust formation, which is why it is not preferred.

[0055] Preferably, the feed wheel pair and the discharge wheel pair are each equipped with their own drive for independently driving and / or braking at least one of the respective feed wheel pairs. Preferably, the drives are driven and / or braked independently of each other, particularly via a higher-level control unit, such that the feed wheel pair and the discharge wheel pair tension the packaging material strand before the packaging product is cut off. This can be achieved, for example, by the discharge wheel pair driving the packaging material strand more strongly than the feed wheel pair before cutting. This stronger driving force can, for example, consist of a higher conveying speed communicated to the packaging material strand by the discharge wheel pair.Alternatively or additionally, the increased drive can consist of a greater conveying force communicated to the packaging material strand and / or a greater rotational movement of at least one driven discharge wheel of the discharge wheel pair relative to the rotational movement of at least one driven feed wheel of the feed wheel pair. Particularly preferably, the conveyor wheel pairs are braked, especially stopped, before the packaging material strand is tensioned. This can prevent excessive slippage and the associated dust formation.

[0056] The use of conveyor wheel pairs is particularly advantageous for the present invention because it reduces friction between the packaging material strand and the conveying device, in particular reduces slippage, and thereby in particular reduces dust formation during the manufacture of packaging material products.

[0057] In an advantageous embodiment of the present invention, the feed wheel pair and / or the discharge wheel pair engages the strand of packaging material between two conveyor wheels and conveys the strand of packaging material along or against the conveying direction. Alternatively or additionally, the feed wheel pair and / or the discharge wheel pair conveys the strand of packaging material along or against a conveying direction defined by a common tangent at a respective outer circumference of the conveyor wheels.

[0058] In a further advantageous embodiment of the present invention, the conveyor wheels of the feeder pair and / or the discharge pair are preloaded against each other. Preferably, the conveyor wheels of the feeder pair and / or the discharge pair are preloaded against each other with a force of at least 1 Newton, 50 Newtons, 100 Newtons, or 150 Newtons, at least 250 Newtons, 350 Newtons, or 450 Newtons, or at least 550 Newtons, 700 Newtons, or 900 Newtons. Alternatively or additionally, the center-to-center distance of the conveyor wheels of each pair is undersized such that the wheels are elastically preloaded against each other.

[0059] In a preferred embodiment, the wheel axes of at least one, preferably both, pairs of conveyor wheels run parallel to each other. Alternatively or additionally, the wheel axes of at least one, preferably both, pairs of conveyor wheels run transversely, preferably orthogonally, to the conveying direction or a conveying direction defined by a common tangent at a respective outer circumference of the conveyor wheels, and / or along a plane that extends transversely, preferably orthogonally, to the conveying direction or a conveying direction defined by a common tangent at a respective outer circumference of the conveyor wheels.

[0060] In In a preferred embodiment, the conveyor wheel pairs are aligned in a plane aligned with each other, which has a wheel axis of one conveyor wheel pair, preferably both wheel axes of both conveyor wheel pairs, as a normal vector.

[0061] InIn a particularly preferred embodiment of the present invention, at least one wheel of at least one pair of front wheels comprises an elastically deformable picking area, wherein the wheel is preferably formed by an elastomer body, such as a PU foam body, or has a corresponding outer coating.

[0062] When the present invention refers to fiber starting material, this particularly refers to a preferred embodiment or a preferred application of the present invention. Preferably, the device according to the invention can be used to manufacture a packaging material product from starting material in general, i.e., from fiber starting material, from fiber-free starting material such as plastic, and / or from composite material, such as combinations of fiber starting material and fiber-free starting material.

[0063] Further advantages, effects, and embodiments of the present invention will become apparent from the figures shown below. These figures show: Fig. 1 shows a bottom view of a device according to the invention, wherein the lower and upper boundary walls have been removed to illustrate the individual components and the cutting edge is in a cutting start position; Fig. 2 shows the device made of Fig. 1 , wherein the cutting edge is in a cutting center position; Fig. 3A the device made of Fig. 1 , with the cutting edge in a cutting end position; Fig. 3 enlarged section of area A from the legs Fig. 3A ; and Fig. 4 a perspective view of the device from Fig. 1Fig. 5 a schematic representation of a device for manufacturing packaging material; Fig. 6 a schematic representation of conveying a strand of packaging material between two pairs of conveyor wheels; Fig. 7 a schematic representation of clamping a strand of packaging material between two pairs of conveyor wheels; Fig. 8 a schematic representation of separating a packaging material product from a strand of packaging material by moving a cutting edge between two pairs of conveyor wheels; Fig. 9 a schematic representation of the packaging material product and the strand of packaging material immediately after the packaging material product has been separated;

[0064] Fig. 1Figure 6 shows a bottom view of a preferred embodiment of a device 601 for manufacturing packaging material products, in which a lower and upper boundary wall, in particular of the conveying channel 619, is hidden to show the individual components of the device 601. Fig. 1 The device 601 with the cutting edge 605 of a cutting device 603 is shown in a preferred cutting start position. Fig. 2 The device shows Fig. 1 with the cutting edge 605 in a middle position between a preferred cutting start position and a preferred cutting end position. Fig. 3A The device 601 shows Fig. 1 with the cutting edge 605 in a preferred cutting end position. Fig. 3B shows an enlarged view of area A Fig. 3A . Fig. 4 shows a perspective view of Fig. 3A

[0065] The device 601 comprises a cutting device 603 for cutting off the packaging material product (in the Figures 1 to 4 (not shown) of a three-dimensional packaging material strand 611, such as a paper cushion strand formed in the device 601 from a single- or multi-layer paper web. In the conveying direction upstream F of the cutting device 603, a feed wheel pair 613 is provided for conveying the packaging material strand (into the Figures 1 to 4(not shown) arranged. In the conveying direction F downstream of the cutting device 603, a discharge wheel pair 615 is arranged for conveying the packaging material strand. The feed wheel pair 613 is driven by a drive 635, in particular in the form of an electric motor. The output of the drive 635 of the feed wheel pair 613 is coupled via a gearbox 637, in particular a worm gearbox, to the feed wheel pair 613, in particular to a drive shaft 639 of a feed wheel, in particular the driven feed wheel 641.

[0066] By conveying direction F, preferably the direction in which the packaging material strand 611 is conveyed from the feed wheel pair 613 to the discharge wheel pair 615 is conveyed is meant. In the preferred embodiment shown here, the packaging material strand 611 is conveyed directly, i.e., without being deflected, from the feed wheel pair 613 to the discharge wheel pair 615. However, it should be clear that in a less preferred embodiment, the packaging material strand 611 can also be deflected between the feed wheel pairs 613 and 615. In a broader sense, conveying direction F is therefore to be understood as the direction in which the packaging material strand 611 is conveyed upstream and downstream of the conveying device, in particular the cutting edge 605.For example, with several deflection devices between the conveyor wheel pairs 613, 615, the conveying direction F would be defined by the direction in which the packaging material strand 611 is conveyed from the deflection device located upstream of the cutting device 605 and from the deflection device located downstream of the cutting device 605. In the preceding and subsequent descriptions of the arrangement in the conveying direction F upstream and downstream of the cutting device or the cutting device 605, the cutting state in which the cutting device 605 engages the packaging material strand 611 is preferably always taken into account. In the preferred embodiment, in which the cutting device 605 moves translationally, a straight line extending along the cutting direction S can thus be considered as a reference for the upstream and downstream arrangement of components.In embodiments where the cutting edge moves only translationally during the cutting action, or, contrary to the first aspect of the present invention, moves purely rotationally, a line extending in the cutting direction S at the time of the cutting action must be considered for assessing the upstream and downstream positioning of components relative to the cutting edge 605. The cutting direction S is the direction in which the cutting edge 605 penetrates the packaging material strand 611 during the cutting action. Therefore, in the case of a cutting edge 605 that is guided purely rotationally, contrary to the first aspect of the present invention, the tangent during the cutting action would have to be considered as the cutting direction S.

[0067] The conveyor wheel pair is driven by its own drive 643, in particular an electric motor. The output of the drive 643 is coupled via a gearbox 645 to the output wheel pair 615, in particular to a drive shaft 647 of a driven conveyor wheel 649.

[0068] The cutting device 603 is driven by a drive 651, in particular in the form of an electric motor. In the Figs. 1 to 3The electric motor 651 of the cutting device 603 extends into the plane of the drawing and in the cutting direction S. The output of the drive 651 of the cutting device 603 is coupled to the cutting device 603 via a gearbox 653, in particular a gearbox integrated with the cutting device. In the embodiment shown here, the gearbox 653 of the cutting device 603 comprises a reduction gearbox 655 for increasing or decreasing the output motion of the drive 651. Furthermore, the gearbox 653 integrated with the cutting device comprises a conversion gearbox 657 for converting a rotary motion into a translational motion, in particular in the cutting direction S.

[0069] Preferably, the cutting edge 605 has several cutting teeth 663. Preferably, the cutting edge 605 has seven cutting teeth 663. The cutting teeth meet each other, in particular, in a direction transverse to the conveying direction F, especially orthogonally to it, and transverse to the cutting direction S, especially orthogonally to it. The teeth can extend over the entire depth T of the cutting edge 605. In the drawings, the depth T of the paper cushioning machine is the direction pointing out of the plane of the drawing. The depth T preferably runs transversely, especially orthogonally, to the cutting direction S and to the conveying direction F.

[0070] Preferably, the teeth 663 extend substantially over the entire depth T of the conveying channel 619. The entire depth T does not mean that the cutting edge 605 grinds along the upper and lower boundary walls (not shown). Rather, a corresponding gap is preferably provided in the transition area between the upper and lower boundary walls and the cutting edge, so that the cutting edge 605 moves without contact with the upper and lower boundary walls. The cutting teeth 663 are preferably designed as triangles tapering to a point in the cutting direction S, which preferably taper pyramidally in the conveying direction F over the thickness of the cutting edge. The cutting teeth adjoining the upper and lower boundary walls at depth T transition, particularly in the direction opposite to the cutting direction S, into a mounting section 665 of the cutting edge 605.The cutting edge 605 is connected, in particular via the mounting section 665, to a slide 667 of the cutting device 603, preferably by screws. For fastening the cutting edge 605 to the slide 667, bores 669 are preferably provided in the mounting section 665 of the cutting edge 605. The cutting edge is preferably connected to the slide 667 of the cutting edge via the bores 669 with screws or rivets. The slide moves, in particular, in the cutting direction S.

[0071] The conversion mechanism 657 of the cutting device 603 preferably comprises two articulated sections 671, 673 rotatably connected to each other, in particular about a rotational axis D1 extending in the conveying direction F. The articulated sections 671, 673 are each preferably connected to each other at one end. One articulated section 673 faces the carriage 667 in the conveying direction. The other drive 651 faces, in particular, the transmission gear 655 of the drive 651. The articulated section 673 facing the carriage 667 is movably connected to the carriage 667 at its end opposite the rotational axis D1 via a rotational axis D2 extending, in particular, in the conveying direction F. The joint section 671 facing the drive 651, in particular the transmission gear 655, is articulated to the transmission gear 655 via a rotary axis D3 extending in particular in the conveying direction F.Furthermore, the cutting device 603 preferably has a guide 675 in the cutting direction S. The guide preferably comprises a cylinder 677 extending, in particular, in the cutting direction S, and a slide shoe 679 movable along the cylinder 677 in the cutting direction S. The slide shoe 679 is preferably fixedly connected to the slide 667. Particularly preferably, the guide for the cutting edge 605 is located downstream of the cutting edge 605 in the conveying direction F, and the gearbox 653, in particular the conversion gearbox 657, is arranged upstream of the cutting edge 605 in the conveying direction F. In the illustrated embodiment, a transmission gearbox 655 is provided between the axis of rotation D3 and the drive 651 for translating the drive's rotary motion. Preferably, the transmission gearbox 655 is a worm gear. Furthermore, the gearbox 655 can additionally be designed to offset the axis of rotation of the drive 651, in particular by 90° to the axis of rotation D3.

[0072] Preferably, one of the feed wheels of the feed wheel pair is not directly driven by the drive 635. The feed wheel 301 that is not directly driven is preferably driven indirectly via the driven feed wheel 641. This is particularly preferably achieved by biasing the undriven feed wheel 301 against the driven feed wheel 641. As shown in particular in the Figures 1 to 3aAs can be seen, the preload is achieved in particular by undersizing the distance between the wheel axles 303, 305. By undersizing the feed wheel axle distance ZA, the feed wheels are elastically preloaded against each other. To adjust the feed wheel axle distance ZA, preferably at least one of the feed wheels 641, 301 can be moved relative to the other feed wheel or clamped to it. Preferably, a clamping device 307 is provided for this purpose, with which one of the feed wheels 641, 301 is clamped to the other feed wheel 301, 641 via wall sections of the device 601.The clamping device preferably comprises a wheel receptacle 309 connecting the feed wheel 301 to the lower and upper boundary walls (not shown) and at least one, preferably two, fastening means 313, such as a screw 313 (shown only in the case of the discharge wheel pair 615), connecting the wheel shaft 311 of the feed wheel 301 to the wheel receptacle 309. As shown in . Figure 1As shown, the clamping device 307 is preferably attached to the non-driven feed wheel 301. This allows the feed wheel center distance ZA to be adjusted, for example by actuating the fastening element 313, while the driven feed wheel 641 remains in a constant position relative to the drive 635. This allows the tension between the feed wheels to be adjusted, particularly depending on the fiber feed material being processed or the desired geometry of the packaging material product, especially without significantly increasing the development effort of the device 601.

[0073] Alternatively or additionally, the conveyor wheels 649, 315 are preloaded against each other. The preload between the conveyor wheels 315, 649 is particularly preferably adjusted by means of an undersized conveyor wheel center distance AA between the wheel axis 317 of the driven conveyor wheel 649 and the wheel axis 319 of the undriven conveyor wheel 315. The conveyor wheel center distance AA can be adjusted as described for the feed wheel pair 613 by means of a clamping device 321. The clamping device 321 of the conveyor wheel pair 615 preferably also has a wheel receptacle 323 with which the output shaft 325 of an output wheel 315, 649 is attached to the device 601, and a connecting element 313 for connecting the wheel shaft 325 to the wheel receptacle 323 of the clamping device 321.

[0074] An undersized wheel axle spacing means, in particular, that the distance between the wheel axles 303, 305, 317, 319 of a wheel pair is smaller than the sum of the radii of both wheels, especially in the disassembled state. This can be ensured, in particular, by a certain degree of elasticity in the conveyor wheels. Therefore, it is preferred to manufacture the conveyor wheels from an elastomer body, such as a PU foam body, or to provide them with an elastically deformable rolling area on their outer circumference. The elasticity of the conveyor wheels can be further increased by incorporating several, in particular between six and fourteen, recesses 327, especially recesses 327 distributed evenly in the circumferential direction. To ensure that the elasticity of the conveyor wheels is largely independent of the rotational position, the recesses 327 are preferably incorporated into the conveyor wheels evenly in the circumferential direction.

[0075] The Figures 1 to 4The illustrated device 601 shows the state in which no packaging material strand 611 is engaged with the conveyor wheel pairs 613, 615. In this state, the wheels of the conveyor wheel pairs preferably contact each other by mutual clamping in a contact surface, which is particularly circular or elliptical. If, however, the conveyor wheel pairs 613, 615 are engaged with the packaging material strand, the respective conveyor wheels are preferably separated from each other by the packaging material strand. In a less preferred embodiment, the conveyor wheels are merely tangent to each other or are spaced apart from each other, so that a force transmission between the conveyor wheels of a conveyor wheel pair 613, 615 only occurs when the packaging material strand 611 is engaged with the respective conveyor wheel pair.Preferably, the wheel axes 317, 319 of the discharge wheel pair and / or the wheel axes 303, 305 of the feed wheel pair are aligned with each other such that the tangent TAZ of the feed wheel pair and / or the tangent of the discharge wheel pair TAA runs parallel to the conveying direction F. In this context, "tangent" is not to be understood exclusively as meaning that the conveying wheels merely touch each other; rather, even in the preferred embodiment where a contact surface is formed between the conveying wheels, a line extending in the conveying direction between the first contact point and the last contact point is to be considered the tangent.

[0076] In less preferred embodiments, the wheel axles 303, 305, 317, 319 of each wheel pair 615, 613 can be offset from one another such that the tangent TAZ of the feed wheel pair and / or the tangent TAA of the discharge wheel pair are inclined relative to the conveying direction F. Particularly preferred are the wheel axles of each feed wheel pair arranged relative to one another such that the tangents TAZ and TAA run parallel to each other and are particularly preferably identical. This can be achieved, in particular, by arranging the wheel axles 303, 305, 317, 319 of each wheel pair 613, 615 one above the other, especially in the cutting direction S.

[0077] In the conveying direction F, at the level of the cutting device 603, a conveying channel 619 extends, which is bounded by a boundary wall 617. Preferably, the conveying channel 619 extends upstream and downstream of the cutting device in the conveying direction to the feed wheel pair 613 and the discharge wheel pair 615, and preferably beyond the feed wheel pairs. A gap 629 is formed in the boundary wall 617 such that the cutting edge 605 can move in and out of the gap 629 without contact.

[0078] Before the packaging material product 609 is separated from the packaging material strand 611, the packaging material strand 611 extends between the conveyor wheel pairs 613, 615. As in the comparison of the Figures 1 to 3As can be seen, the cutting edge 605 traverses the conveying channel 619 preferably in a purely translational manner. In particular, the cutting edge 605 travels transversely, preferably orthogonally to the conveying direction. Preferably, the device is oriented such that the cutting edge 605 traverses the conveying channel 619 horizontally. Traversing, in this context, means in particular that, during the movement from the cutting start position to the cutting end position, the cutting edge enters the conveying channel 619 from one side in the cutting direction S and exits the conveying channel 619 from the opposite side in the cutting direction S. Entry into the conveying channel 619 is effected in particular via a retraction gap 633, which is provided in the boundary wall 617. Exit from the conveying channel 619 is effected in particular via a gap 629, which is provided in the boundary wall 617.The details of column 629 and the retraction column 633 are described in the schematic diagram in . Fig. 5 described.

[0079] Preferably, the gap 629 and the retraction gap 633 are aligned with each other in the cutting direction S, so that the cutting edge 605 can move in and out of the conveying channel 619 translationally, and in particular purely translationally. The counter edges 623, 623', 627, 627' are preferably adapted to the guide of the cutting edge 605 such that the cutting edge 605 can move in and out of the conveying channel 619 without contact. As shown in particular in the Fig. 3a and 3bAs can be seen, the distance a between the counter edge 623, which limits the gap 629 upstream in the conveying direction F, and the cutting edge 605 in the conveying direction F can be smaller than the distance a' between the counter edge 623', which limits the retraction gap 633 upstream in the conveying direction, and the cutting edge 605 in the conveying direction. By minimizing the distance a between the upstream counter edge 623 and the cutting edge 605 in the conveying direction F when entering the gap 629, the function of the counter edge 623 as a separating contact edge can be enhanced. However, an excessively small distance a can also increase the risk of the packaging material strand 611 becoming trapped in the gap 629, resulting in a packaging material blockage. The aforementioned preferred dimensions of the distance a therefore represent a preferred compromise between these two effects.In contrast, the counter edge 623', which limits the upstream portion of the retraction gap 633, does not have the same effect on supporting the separation process, so the distance a' in the conveying direction can be made larger. The counter edge 623' particularly causes the removal of any scraps adhering to the cutting edge 605 or of the packaging material strand 611.

[0080] As previously described, the conveying channel 619 is bounded upstream of the gap 605 in the conveying direction F by an upstream wall section 621 and downstream of the gap 629 by a downstream wall section 625. Whenever the conveying channel 619 is referred to before or after in the cutting direction S, this means, in particular, that the cutting edge passes through the section of the conveying channel 619 bounded by the upstream wall section 621. Specifically, the cutting edge should be located outside the conveying channel 619 in the cutting direction S when in the cutting start position to prevent the packaging material strand 611 from becoming stuck on the cutting edge 605, especially at the cutting tip 631, between the conveyor wheel pairs 613 and 615.

[0081] As particularly in Fig. 3BTo be clearly recognizable, the cutting tip 631 of the cutting edge 605 should project significantly beyond the cutting edge, particularly in the cutting end position, by a distance d between the cutting tip 631 and the counter edge 623 that limits the gap 629 upstream. Preferably, the distance d is greater than a distance c between the counter edges 623 and 627 that limit the gap 629, so that the tip 631 of the cutting edge 605 also extends beyond the counter edge 627 in the cutting end position, in particular by a distance e. By extending the cutting tip 631 out of the conveying channel 619, it is ensured in particular that dust and cutting chips generated when the packaging material product 609 is separated from the packaging material strand 611 are conveyed out of the conveying channel 619, in particular ejected and / or scraped off at the counter edges 623, 627 when re-entering the conveying channel, so that they do not re-enter the conveying channel 619.The previously described preferred dimensions of the distances d, e, a and b therefore represent an advantageous compromise between the benefits of dust and chip removal and the support of cutting by the counter edge 623 and the risk of blockages and wear of the cutting edge 605.

[0082] The distance c between the upstream counter edge 623 and the downstream counter edge 627 serves, in particular, to ensure that the packaging material strand 611, when the packaging material product 619 is separated, may come into contact with the wall section 621 upstream in the conveying direction F, but remains free of contact with the wall section 625 located downstream of the gap 629 in the conveying direction. This reduces, in particular, the risk of the packaging material strand 611 or the packaging material product 619 being drawn into the gap 629 and causing a blockage. The same applies to the distance c' between the counter edges 623' and 627' that define the retraction gap 633.Overall, it is advantageous if the section of the conveying channel 619 formed downstream of the cutting edge 605 in the conveying direction F is widened in the cutting direction compared to the section of the conveying channel 619 formed upstream of the cutting edge 605.

[0083] Preferably, the boundary wall 617, upstream of the feed impeller pair 613 and / or the discharge impeller pair 615 in the conveying direction F, has a funnel-shaped section 659, 661 that tapers in the conveying direction F. Preferably, the taper of the funnel-shaped section 659, 661 occurs in the cutting direction S. Alternatively or additionally, the taper can be formed in a direction orthogonal to both the conveying and cutting directions. The funnel-shaped section 659, 661 can be round or angular. In the embodiment shown here, the funnel-shaped section is angular and tapers only in the cutting direction S. The narrowing of the conveying channel 619 is preferably formed in the area of ​​the conveying channel 619 in which the packaging material strand 611 engages with the feed wheel pair 613 and / or the discharge wheel pair 615.By narrowing the conveying channel 619, the degree of deformation of the essentially two-dimensional paper web into the three-dimensional packaging material strand can be increased, and the engagement with the conveying wheel pairs 613, 615 can be facilitated.

[0084] Fig. 5 shows a schematic representation of a device 601 for manufacturing a packaging material product 609 (in Fig. 5 (not shown) from a fiber starting material, in particular from a paper cushion strand formed in the device from a single or multi-layer paper web (in Fig. 5(not shown). The device has a cutting edge 605 of a cutting device for separating the packaging material product 609 from a packaging material strand 611. Upstream of the cutting edge 605 in the conveying direction F, a feed wheel pair 613 is arranged for conveying the packaging material strand 611. Furthermore, downstream of the cutting edge 605 in the conveying direction F, a discharge wheel pair 615 is arranged for conveying the packaging material strand 611 away.

[0085] The Fig. 5The position of the cutting edge 605 shown is a schematic representation of the preferred final cutting position. Preferably, the cutting edge 605 moves purely translationally from a cutting start position in the cutting direction S to the final cutting position. The cutting direction S is particularly preferred to be transverse or orthogonal to the conveying direction F. The cutting edge can also be guided such that it passes translationally, particularly in the cutting direction S, at least through the packaging material strand 611 when separating the packaging material product 609. The cutting edge 605 can also be guided at least such that it translationally cuts the packaging material strand 611 transversely to the conveying direction during the cutting engagement. The cutting edge does not necessarily have to move translationally through the entire packaging material strand 611, but can, in particular, also move translationally only during the cutting engagement with the packaging material strand 611.It is preferred that the cutting direction S runs transversely, particularly preferably orthogonally, to the conveying direction F and / or horizontally.

[0086] The device 601 has a conveying channel 619 which is bounded by a boundary wall 617. Particularly preferably, the conveying channel 619 extends in the conveying direction F at least between the two pairs of conveying wheels 613, 615. In a less preferred embodiment, the conveying channel extends at least to the conveying direction height of the cutting device or the cutting edge 605. It is particularly important to limit the conveying channel 619 directly upstream and downstream of the cutting edge 605. The conveying channel 619 is bounded by a boundary wall 617. A gap 629 is formed in the boundary wall 617 such that the cutting edge 605 can move in and out of the gap 627 without contact. In the conveying direction F upstream of the gap 629, the conveying channel is bounded by a wall section 621 which has an upstream counter edge 623 that limits the gap in the conveying direction F upstream.In the conveying direction downstream of the gap 629, the conveying channel 619 is bounded by a downstream wall section 625, which has a downstream counter edge 627 that limits the gap 629 in the conveying direction F downstream.

[0087] Preferably, the cutting edge 605 is spaced apart from the downstream counter edge 627 and from the upstream counter edge 623 when entering and exiting the gap 629 in the conveying direction F. Fig. 5The particularly preferred embodiment is shown, in which the cutting edge 605 moves purely translationally and orthogonally to the conveying direction F when moving from the cutting start position to the cutting end position, such that the distances of the counter edges 623, 627 to the cutting edge 605 are constant in the conveying direction F. In less advantageous embodiments, however, the cutting edge can also move at an obtuse or acute angle transverse to the conveying direction F or move partially rotationally. In such embodiments, the position of the cutting edge 605 when entering and exiting the gap is relevant for determining the distance between the cutting edge and the counter edge. If the counter edges 623 and 627 are at the same height in the cutting direction S, the position of the cutting edge is identical when entering and exiting the gap. However, if the counter edges 623, 627 are as shown in the figure, the position of the cutting edge is identical when entering and exiting the gap. Fig. 5Shown offset from each other in the cutting direction, the entry into the gap 629 is defined by the position of the cutting edge 605 at which, when moving from a cutting start position to a cutting end position with the cutting tip 631, the cutting edge reaches the height of the first counter edge, here the upstream counter edge 623. The exit from the gap 629 is in turn determined by the position of the cutting edge 605 at which, when moving from the cutting start position to the cutting end position with the cutting tip 631, reaches the height of the second counter edge, here the downstream counter edge 627.

[0088] According to the second aspect of the present invention, the cutting edge moves into the gap 629 without contact and also moves out of the gap 629 without contact. The distance between the upstream counter edge 623 and the cutting edge 605 during entry into and exit from the gap is in Fig. 5with the reference numeral a. The distance of the downstream counter edges 627 to the cutting edge when entering and exiting the gap 629 is shown in Fig. 5 with reference numeral b. The preferred distance between the upstream counter edge 623 and the downstream counter edge 627 in the cutting direction is shown in Fig. 5 The distance by which the cutting edge 605 extends beyond the upstream counter edge 623 when entering the gap in the cutting direction S is shown in Fig. 5 with the reference numeral d. The distance by which the cutting edge 605 extends beyond the downstream counter edge 627 during entry and exit, particularly in the cutting end position, is shown in Fig. 5 with the reference number e.

[0089] The device 601 can additionally have a retraction gap 633 formed in the boundary wall 617, which is configured such that the cutting edge can move in and out of the conveying channel 619, particularly without contact. The retraction gap 633 is preferably formed on a section of the boundary wall 617 opposite the gap in the cutting direction S. Particularly preferably, the retraction gap 633 and / or the section of the boundary wall 617 opposite the gap 629 is configured like the gap 629 and / or like the wall sections surrounding the gap. This means, in particular, that the conveying channel 619 is bounded upstream of the retraction gap 633 in the conveying direction F by an upstream wall section 621' which has an upstream counter edge 623' that limits the retraction gap 633 upstream in the conveying direction.

[0090] Alternatively or additionally, it is understood that the conveying channel 619 in the conveying direction F downstream of the retraction gap 633 is bounded by a downstream wall section 625' which has a downstream counter edge 627' that limits the retraction gap 633 in the conveying direction F downstream.

[0091] Preferably, the cutting edge 605 is spaced from the upstream counter edge 623' when entering and exiting the gap in the conveying direction F and / or from the downstream counter edge 627' in the conveying direction F.

[0092] Furthermore, alternatively or additionally, it is understood that the downstream counter edge 627' and the upstream counter edge 623' are spaced apart from each other in the cutting direction, in particular that the downstream counter edge 627' is spaced further away from the cutting tip 631 in a cutting end position in the cutting direction S than the upstream counter edge 623'. The distance between the upstream counter edge 623' and the downstream counter edge 627' in the cutting direction is in Fig. 5 The distance between the cutting edge 605 during entry and exit into the retreat gap 633 and the upstream counter edge 623 is shown in Fig. 5 with the reference numeral a' shown. The distance between the downstream counter edge 627' and the cutting edge 605 during entry and exit into the retreat gap 633 is shown in Fig. 5 with the reference number b' shown.

[0093] The above and following descriptions of the wall cuts, counter edges, and distances between the wall sections, in particular the counter edges and the cutting edge in the area of ​​the gap 629, represent configurations of the corresponding components in the area of ​​the retraction gap 633 and vice versa. For distances specified in the cutting direction S, as shown in the figure, Fig. 5 It is evident, however, that care must be taken to ensure that the position of the upstream and downstream counter edges 623', 627' is executed in the opposite direction to the distances of the counter edges 623, 627 in the cutting direction S.

[0094] The Figures 6 to 9 Figure 609 schematically illustrates the process of a preferred method for manufacturing a packaging material product. Figure 6The conveying of the packaging material strand between two conveying devices in the form of conveying wheel pairs 613, 615 is shown. In this, the packaging material strand 611 is fed to a cutting device 603 via a feeder wheel pair 613. Figures 6 to 9 Only one cutting edge 605 of the cutting device 603 is indicated in the form of an arrow. As in Figure 6As can be seen, the packaging material strand 611 is conveyed in the conveying direction F beyond the cutting edge 605 of the cutting device until it reaches a discharge device. The discharge device is shown here in the previously described preferred embodiment of a discharge wheel pair 615. Preferably, the packaging material strand 611 is conveyed in the conveying direction until it engages with the discharge wheel pair 615. During conveying of the packaging material strand 611, the feed wheel pair and the discharge wheel pair are each driven with a feed speed nin and a discharge speed nout, respectively. By independently driving the feed wheel pair 613 and the discharge wheel pair 615, the speeds nin and nout can be adjusted as desired, both in their magnitude and relative to each other.Depending on the material of the packaging material strand, it may be advantageous to coordinate the rotational speeds nin and nout in such a way that the packaging material strand 611 is already under tension during conveying.

[0095] The Figures 6 to 9 Figure 6 shows a preferred embodiment of a method for manufacturing packaging material products. This method relates to the manufacture of a packaging material product 609, in which a strand of packaging material 611 is fed to a cutting device via a feed device 613, the packaging material product 609 is cut from the strand of packaging material 611 by the cutting device 603, and the packaging material product 609 is conveyed away via the discharge device 615. The feed device 613 and the discharge device 615 are pre-charged before the packaging material product 609 is cut, as is particularly relevant in connection with… Fig. 7described, driven and / or braked independently of each other in such a way that the packaging material strand 611 is tensioned between the conveying devices 613, 615.

[0096] Fig. 7Figure 1 shows a preferred embodiment of tensioning the packaging material strand 611, in which the feed wheel pair 613 is braked, in particular stopped, and the discharge wheel pair 615 is driven over a predetermined angle ϕis,ab. Preferably, the predetermined angle ϕis,ab, around which the driven discharge wheel 649 is rotated, is smaller than a target angle ϕshould,ab, with which the discharge wheel pair 615, in particular the driven discharge wheel 649, is driven. The difference between the predetermined angle ϕis,ab and the target angle ϕshould,ab arises in particular because the feed wheel pair 613 is braked, in particular stopped, such that the wheels 641, 301 of the feed wheel pair do not at least completely follow the rotational movement of the wheels 649, 315 of the discharge wheel pair. As shown in Figure 1, the following applies: Fig. 7As can be seen, the wheels of the feed wheel pair 613 can also be rotated, in particular by an angle ϕ, by the tension transmitted to the feed wheel pair 613 via the packaging material strand 611. However, the drive wheels 641, 301 are braked or stopped such that the predetermined angle ϕ at which the feed wheels are rotated is smaller than the predetermined angle ϕ at which the discharge wheels are rotated, thus creating tension in the packaging material strand 611. This braking can be achieved, for example, by a drive that imparts a braking torque to the feed wheel pair 613 in the opposite direction to the conveying direction F. Alternatively or additionally, the feed wheel pair 613 can also be braked by stopping it.For example, the feed wheels 301, 641 of the feed wheel pair can be preloaded against each other in such a way that even if the feed wheel pair is not driven at the time of preloading, there is resistance to a rotational movement of the feed wheels, so that the feed wheels 641, 301 do not move over the entire distance specified by the discharge wheel pair 615.

[0097] Alternatively to the Fig. 7In the illustrated embodiment, the tension of the packaging material strand 611 can also be achieved by braking, in particular stopping, the discharge wheel pair 615 and by driving the feed wheel pair 613 in the opposite direction to the conveying direction F in an analogous manner. Furthermore, the tensioning can also be achieved by driving both feed wheel pairs at different speeds, or by driving the conveying wheel pairs in different directions, in particular the feed wheel pair in the opposite direction to the conveying direction F and the discharge wheel pair 615 in the conveying direction F.

[0098] Figure 8Figure 6 shows the separation of the packaging material product 609 from the packaging material strand 611. The figure shows the position in which the cutting edge 605 has already penetrated the packaging material strand 611, but has not yet completely severed it. Upon penetration of the cutting edge into the packaging material strand, the cutting edge 605 transmits a force in the cutting direction S to the packaging material strand 611, which transmits a torque to the conveyor wheels of the feed wheel pair 613 and the discharge wheel pair 615. Depending on the sharpness of the cutting edge 605, the braking torque of the stopped or braked conveyor wheel pair, and / or the force with which the conveyor wheel pairs are possibly clamped against each other, the insertion of the cutting edge 605 into the packaging material strand 611 can also cause a rotational movement of the infeed conveyor wheel pair by a differential angle Δϕ S,in and / or of the outfeed conveyor wheel pair 615 by a differential angle Δϕ S,off. As can be seen by comparing by Fig. 7 and Fig. 8As becomes clear, the separation can thereby cause an increase in the difference between the target angles Δϕ S,zu , Δϕ S,ab and the predetermined actual angles ϕ ist,zu and ϕ ist,ab.

[0099] Figure 9Figure 1 shows a preferred state after the separation process, in which the packaging material strand 611 and the packaging material product 609 are preferably located centrally in the conveying channel, particularly outside the gap 629. This state can be achieved in particular by the fact that the target angles ϕtarget,to and ϕtarget,off are set as a result of the separation of the packaging material product, thereby conveying the packaging material product 609 in the conveying direction F and / or the packaging material strand 611 in the opposite direction to the conveying direction F, in particular by pulling it out of the gap 629.Thus, by coordinating the predetermined angles ϕis,to and ϕis,off of the feed wheel pair 613 and the discharge wheel pair 615, and the target angles ϕtarget,to and ϕtarget,off of the feed wheel pairs 613 and 615, a mechanism, particularly an automatic one, to prevent packaging material blockages can be integrated into a process and / or a device for the production of packaging material. In particular, by independently driving the feed wheel pairs, this mechanism can be individually adjusted depending on the fiber feed material to be processed and the desired packaging material product to be produced by adjusting the target angles and, if necessary, the braking torques.

[0100] The features disclosed in the foregoing description, figures and claims can be important for the realization of the invention in its various embodiments, both individually and in any combination. Reference symbol list

[0101] 301 Undriven feed wheel 303 Wheel axle of the undriven feed wheel 305 Wheel axle of the driven feed wheel 307 Clamping device of the feed wheel pair 309 Wheel mount of the clamping device 307 311 Wheel shaft of the undriven feed wheel 301 313 Connecting means of the clamping device 315 Undriven discharge wheel 317 Wheel axle of the driven discharge wheel 319 Wheel axle of the undriven discharge wheel 321 Clamping device of the discharge wheel pair 323 Wheel mount of the clamping device 321 325 Wheel shaft of the undriven discharge wheel 327 Recess in conveyor wheel 601 Device 603 Cutting device 605 Cutting edge 609 Packaging material product 611 Packaging material strand 613 Feed wheel pair 615 Discharge wheel pair 617 Boundary wall 619 Conveyor channel 621, 621'Upstream wall section 623, 623'Upstream counter edge 625, 625'Downstream wall section 627, 627'Downstream counter edge 629 Gap 631 Cutting tip 633 Retraction gap 635 Drive,Electric motor of the feed wheel pair 637 Gearbox of the feed wheel pair 639 Drive shaft of the driven feed wheel pair 641 Driven feed wheel 643 Drive, electric motor of the discharge wheel pair 645 Gearbox of the discharge wheel pair 647 Drive shaft of the driven discharge wheel pair 649 Driven discharge wheel 651 Drive,Electric motor of the cutting device 653 Gearbox of the cutting device 655 Transmission gearbox 657 Conversion gearbox 659 Funnel-shaped section of the feed wheel pair 661 Funnel-shaped section of the discharge wheel pair 663 Cutting teeth 665 Mounting section of the cutting edge 667 Slide of the cutting edge 669 Bores in cutting edge 671 Articulated section (facing the transmission gearbox 655) 673 Articulated section (facing the slide 667) 675 Guide of the cutting edge in the cutting direction 677 Guide cylinder 679 Slide shoe T Depth of the paper cushioning machine F Conveying direction S Cutting direction AAA Discharge wheel axle spacing ZA Feed wheel axle spacing TAZ Tangent of the feed wheel pair TAA Tangent of the discharge wheel pair D1 Axis of rotation between the two articulated sections 671 and 673 D2 Axis of rotation between the Joint section 673 and the slide 667 D3 axis of rotation between the joint section 671 and the transmission gear 655 a, a'distance between upstream counter edge and cutting edge in cutting direction b,b'Distance between downstream counter edge and cutting edge in cutting direction c, c'Distance between downstream counter edge and upstream counter edge in cutting direction dDistance between cutting tip and upstream counter edge in the cutting end position of the cutting edge eDistance between cutting tip and downstream counter edge in the cutting end position of the cutting edge. n to feed speed n from discharge speed ϕ is,to predetermined angle of the feed gear pair ϕ is,ab predetermined angle of the discharge gear pair ϕ should,to should angle of the feed gear pair ϕ should,ab should angle of the discharge gear pair Δϕ S,to Difference angle due to the cutting process at the feed gear pair Δϕ S,ab Difference angle due to the cutting process at the discharge gear pair t 1 Start of the manufacturing process t 2 Start of clamping t 3 Start of cutting t 4 Cutting engagement,

Claims

1. Apparatus (601) for producing a packaging material product (609) from a fiber starting material, such as a single-ply or multi-ply paper web or a corrugated board web, in particular of recycled paper, comprising: a separating device (603) for separating the packaging material product (609) from a packaging material strand, such as a corrugated board web or a three-dimensional paper cushioning strand (611) formed from the fiber starting material in the apparatus (601); a pair of feed wheels (613) arranged in the conveying direction (F) upstream of the separating device (603) for conveying the packaging material strand (611); and a pair of discharge wheels (615) arranged in the conveying direction (F) downstream of the separating device (603) for discharging the packaging material strand (611); a conveyor channel extending at least at the conveying direction level of the separating device (603) in the conveying direction (F), which channel is bordered by a boundary wall (617); and a slit (629) formed in the boundary wall (617), which slit is designed in such a way that a blade of the separating device (603) can move in and out of the slit (629) without contact, characterized in that the slit (629) is formed into the boundary wall (617) in such a way that the blade comes into cutting engagement with the packaging material strand (611) before entering the slit (629).

2. Apparatus (601) according to claim 1, wherein in the conveying direction (F) upstream of the slit (629) the conveyor channel (619) is bordered by an upstream wall section (621) having an upstream counter edge (623) which borders the slit (629) upstream in the conveying direction (F).

3. Apparatus (601) according to claim 2, wherein, when moving into and out of the slit (629), the blade is in the conveying direction (F) spaced from the upstream counter edge (623), preferably by 0.1 mm to 50 mm, 0.5 mm to 30 mm or 1.0 mm to 15 mm, wherein preferably the distance (a) between the blade and the upstream counter edge (623) is constant in the conveying direction (F) when moving into and out of the slit (629), particularly preferably over the entire travel distance from a cutting start position into a cutting end position.

4. Apparatus (601) according to claim 2 or 3, wherein the blade (605), when moving into and out of the slit (629), moves beyond the upstream counter edge (623), in particular in the cutting direction (S), preferably by 0.1 mm to 200 mm, 0.5 mm to 100 mm or 5.0 mm to 50 mm beyond the upstream counter edge (623).

5. Apparatus (601) according to any one of claims 2 to 4, wherein in the conveying direction (F) downstream of the slit (629) the conveyor channel (619) is bordered by a downstream wall section (625) having a downstream counter edge (627) which borders the slit (629) downstream in the conveying direction (F).

6. Apparatus (601) according to claim 5, wherein, when moving into and out of the slit (629), the blade is in the conveying direction (F) spaced from the downstream counter edge (627) preferably by 0.1 mm to 200 mm, 0.5 mm to 100 mm or 5.0 mm to 50 mm, wherein preferably the distance (b) in the conveying direction (F) between the blade and the downstream counter edge (627) is constant when moving into and out of the slit (629), particularly preferably over the entire travel distance from a cutting start position into a cutting end position.

7. Apparatus (601) according to claim 5 or 6, wherein the blade (605), when moving into and out of the slit (629), moves beyond the downstream counter edge (627), in particular in the cutting direction (S), preferably by 0.1 mm to 150 mm, 0.5 mm to 70 mm or 5.0 mm to 30 mm beyond the downstream counter edge (627).

8. Apparatus (601) according to any one of claims 5 to 7, wherein the downstream counter edge (627) is offset relative to the upstream counter edge (623) in the cutting direction (S), preferably is offset by 0.1 mm to 200 mm, 0.1 mm to 100 mm, 0.1 mm to 50 mm, 0.5 mm to 30 mm or 5 mm to 10 mm and / or is offset in such a way, that the packaging material strand and / or the packaging material product remain contact-free with respect to the downstream wall section (625), in particular the downstream counter edge (627), when the packaging material product is separated.

9. Apparatus (601) according to any one of claims 1 to 8, wherein the blade moves out of the conveyor channel (619) when moving into and out of the slit (629) and / or, in a cutting end position, the blade protrudes from the conveyor channel (619) by 0.1 to 150 mm, 0.5 to 70 mm, or 5.0 to 30 mm.

10. Apparatus (601) according to any one of claims 1 to 9, wherein the slit (629) is formed into the boundary wall (617) in such a way, in particular the boundary wall is configured (617) in such a way, that the packaging material product is separated before the blade (605) enters the slit (629).

11. Apparatus (601) according to any one of claims 1 to 10, comprising a retraction slit (633) formed in the boundary wall (617), which retraction slit is configured in such a way that the blade can move in and out of the conveyor channel (619), in particular without contact, wherein the retraction slit (633) is preferably formed in a section of the boundary wall (617) which opposes the slit (629) in the cutting direction (S), wherein the retraction slit (633) and / or the opposite section of the boundary wall (617) is preferably formed like the slit (629) and / or the wall sections (621, 625) environing the slit (629).

12. Apparatus (601) according to claim 11, wherein the retraction slit (633) and the slit (629) are formed in the boundary wall (617) in such a way that the blade, when moving from a cutting start position into a cutting end position, can enter the conveyor channel (619) via the retraction slit (633) and, in particular on a side of the conveyor channel (619) opposite in the cutting direction (S), can move out of the conveyor channel (619) via the slit (629) and / or that, when moving from a cutting start position into a cutting end position, the blade first moves into the conveyor channel (619) via the retraction slit (633), comes into cutting engagement with the packaging material strand in the conveyor channel (619) and moves out of the conveyor channel (619) via the slit (629) and / or that the blade can move out of the conveyor channel (619) via the retraction slit (633) when moving from a cutting end position into a cutting start position.

13. Apparatus (601) according to claim 11 or 12, wherein the blade can be moved via the retraction slit (633) completely out of the conveyor channel section which follows the blade in the conveying direction (F).

14. Apparatus (601) according to any one of claims 11 to 13, wherein the retraction slit (633) extends transversely, preferably orthogonally, to the conveying direction (F) and / or to the cutting direction (S).

15. Apparatus (601) according to any one of claims 1 to 14, wherein the slit (629) extends transversely, preferably orthogonally, to the conveying direction (F) and / or to the cutting direction (S).