EP3885274A2 - Machine d'emballage et procédé d'emballage d'un produit à emballer avec un emballage extérieur produit à partir d'une bande supérieure de papier et d'une bande inférieure de papier - Google Patents

Machine d'emballage et procédé d'emballage d'un produit à emballer avec un emballage extérieur produit à partir d'une bande supérieure de papier et d'une bande inférieure de papier Download PDF

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Publication number
EP3885274A2
EP3885274A2 EP21160299.0A EP21160299A EP3885274A2 EP 3885274 A2 EP3885274 A2 EP 3885274A2 EP 21160299 A EP21160299 A EP 21160299A EP 3885274 A2 EP3885274 A2 EP 3885274A2
Authority
EP
European Patent Office
Prior art keywords
welding
paper web
packaging machine
endless
endless elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21160299.0A
Other languages
German (de)
English (en)
Other versions
EP3885274A3 (fr
Inventor
Ulrich Schumayer
Beate Beck-Deharde
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beck Packautomaten GmbH and Co KG
Original Assignee
Beck Packautomaten GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beck Packautomaten GmbH and Co KG filed Critical Beck Packautomaten GmbH and Co KG
Publication of EP3885274A2 publication Critical patent/EP3885274A2/fr
Publication of EP3885274A3 publication Critical patent/EP3885274A3/fr
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00—Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02—Enclosing successive articles, or quantities of material between opposed webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B41/00—Supplying or feeding container-forming sheets or wrapping material
    • B65B41/12—Feeding webs from rolls
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/16—Applying or generating heat or pressure or combinations thereof by rotary members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/303—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes reciprocating along only one axis

Definitions

  • the present invention relates to a packaging machine for packaging a packaged item with an outer packaging produced from an upper paper web and a lower paper web and a method for controlling a packaging machine.
  • Packaging machines are used in many industrial applications for packaging different packaged goods.
  • the packaged goods can be consumer items such as data carriers, books or common items sold in supermarkets, but also special items such as spare parts or building materials such as clay.
  • Packaging machines are also regularly used for magazines with inserts or in the mail order sector.
  • the present invention is primarily concerned with packaging machines in which a fundamental distinction is made between forming shoulder machines, series packaging machines and banding machines. While forming shoulder machines and serial packaging machines are intended to completely enclose a packaged product, a banding machine is simply used to put a band around a packaged product to be packaged.
  • Packaging machines have in common that the outer packaging must be welded and separated on at least one side. For banderoles this is usually only the case on one side, with forming shoulder machines on two or three sides and with serial packaging machines on all four sides of the packaged goods. Packaging machines therefore always have what is known as a cross-cut welding device, which welds the outer packaging transversely to the transport direction of the packaged goods in the packaging machine and at least partially cuts it through. In addition, packaging machines have longitudinal welding devices or longitudinal severing welding devices that weld the outer packaging parallel to the transport direction of the packaged goods and cut off any excess packaging material that may be present.
  • packing machine is therefore to be understood as meaning all of the aforementioned types of packaging machines, but the present invention is particularly concerned with series packaging machines.
  • series packing machine is shown, for example, in the publication DE 10 2006 001 594 A1 .
  • the known packaging machines have in common that the packaging material forming the outer packaging is plastic film (for example polyethylene, polyolefin or the like). Such plastic packaging can have negative effects on the environment, despite the increasing degree of their recyclability.
  • plastic packaging can have negative effects on the environment, despite the increasing degree of their recyclability.
  • An exemplary outer packaging made of paper is the publication DE 20 2019 105 885 U1 refer to.
  • a packaging machine for packaging a packaged item with an outer packaging is proposed.
  • the outer packaging is produced from an upper paper web and a lower paper web.
  • the packaging machine has a transport device for transporting the packaged goods in one transport direction, a transverse separation welding device for welding the paper webs transversely to the transport direction, a first and a second feed device for feeding the paper webs into the transverse separation welding device, the first and the second feed device each having at least one pair of revolving, in particular running over at least two rollers, endless elements for conveying the paper webs, wherein a first endless element of the pair of endless elements is designed for conveying the upper paper web and a second endless element of the pair of endless elements is designed for conveying the lower paper web, a first and a second longitudinal cut-off welding device for welding the paper webs parallel to the transport direction on two opposite longitudinal sides of the paper webs, the first and second longitudinal cut-off welding devices respectively eeil has at least one first pair of revolving endless elements,
  • paper web is understood to mean a packaging material layer made of paper, although this can also be paper-like material consisting of materials other than wood-based fiber, but the properties with regard to properties suitable for packaging, such as strength , Foldability or the like. In principle, however, hybrid packaging materials (e.g. paper / plastic composites or the like) are also included. It goes without saying that the upper and lower paper webs are each at least partially coated on the mutually facing inner surfaces in order to enable thermal sealing or welding of the paper webs lying on top of one another.
  • the term “endless element” is understood to mean a self-contained, in particular belt-shaped, drive element for conveying paper webs, which can be designed, for example, as a belt, chain and / or the like. Such endless elements are particularly suitable for conveying the paper webs due to the flat load distribution.
  • paper web plane is understood here to mean that plane in which the upper paper web and the lower paper web converge and are transported and processed by the packaging machine.
  • the paper web plane can, for example, be that plane in which the transport device for transporting the packaged goods is arranged, but the paper web plane can also be provided, for example, at approximately half the height of the packaged goods.
  • the terms “longitudinal cut-off welding device” and “transverse cut-off welding device” used in the processing of foils are also used. used.
  • the term “welding” of the paper webs is used accordingly.
  • the paper webs are usually coated, for example with an adhesive and / or a plastic.
  • the paper webs are connected to one another by the introduction of heat into the adhesive and / or the plastic.
  • welding or “welding”
  • the terms “gluing” or “gluing” or “sealing to one another” could also be used.
  • the transport speeds of the paper webs in the feed device and in the longitudinal cut-off welding device adjustable relative to one another.
  • the first and second drive devices can be used to bring about a rotational speed of the pairs of endless elements of the feed devices relative to a rotational speed of the pairs of endless elements of the longitudinal cut-off welding device, which in turn has an advantageous effect on the workability of the paper (in particular by tensioning or compressing the paper webs).
  • a method for controlling or operating a packaging machine having a transport device for transporting a packaged item in a transport direction, a transverse separation welding device for welding an upper and a lower paper web transversely to the transport direction, a first and a a second feed device for feeding the paper webs into the cross-cut welding device, the first and the second feed device each having at least one pair of revolving, in particular each running over at least two rollers, endless elements for conveying the paper webs, wherein a first endless element of the pair of endless elements for conveying the upper paper web is formed and a second endless element of the pair of endless elements is formed for conveying the second paper web, a first and a second longitudinal cutting welding device for welding de r paper webs parallel to the transport direction on two opposite longitudinal sides of the paper webs, each of the first and the second longitudinal separation welding device having at least one first pair of revolving, in particular each running over at least two rollers, endless elements, which the first
  • the packaged goods are packed with an outer packaging.
  • the outer packaging is produced from an upper and a lower paper web.
  • the packaged goods are arranged between the upper and lower paper webs.
  • the upper and the lower paper web are thus arranged on opposite sides of the packaged goods.
  • the pairs of endless elements of the feed devices are also operated at a conveying speed which differs from a conveying speed of the pairs of endless elements of the longitudinal cut-off welding devices.
  • the packaging machine furthermore has a control device which is designed to control the first and the second drive device independently of one another.
  • the first drive device for driving the pairs of endless elements of the feed devices and the second drive device for driving the first pairs of endless elements of the longitudinal cut-off welding devices are controlled independently of one another or separately.
  • a conveying speed of the paper webs in the respective feed device can be brought about independently of a conveying speed of the paper webs in the respective longitudinal cut-off welding device.
  • the second drive device is different from the first drive device, the first drive device having a first motor and the second drive device having a second motor, the second motor being different from the first motor, and wherein the controller controls the first and second motors.
  • the first drive device for driving the pairs of endless elements of the feed devices and the second drive device for driving the first pairs of endless elements of the longitudinal cut-off welding devices are controlled separately by means of two independent motors.
  • the first drive device and the second drive device are controlled separately by means of two independent motors.
  • the motor can be an electric motor.
  • pneumatic, hydraulic, magnetic or other motors are also conceivable.
  • control device is also designed to control the first and second drive devices in such a way that the pairs of endless elements of the feed devices are driven at a first conveying speed and the first pairs of endless elements of the longitudinal cut-off welding devices are driven at a second conveying speed, the first conveying speed being different from the second conveying speed.
  • the term "conveying speed” can be understood to mean the speed of rotation or circumferential speed of the corresponding endless element. Assuming a slip-free conveying process, this rotational speed is transferred equally to the respective paper web, so that different conveying speeds between the pairs of endless elements in the transport direction cause different speeds of the paper webs. In other words, the paper webs can be compressed or tightened in the transport direction.
  • the packaging machine according to the first aspect of the invention, it can be provided that when the cross-cut welding device is closed, the first conveying speed of the pairs of endless elements of the feed devices is greater than zero and the second conveying speed of the first pairs of endless elements of the longitudinal cut-off welding devices is equal to zero.
  • cross-cut welding devices have an upper punch and a lower punch, which move towards one another so that they meet in the film web plane (in this case the paper web plane) and the films (here in the present case Separate and weld paper webs).
  • a cross-cut welding device is for example in the publication DE 10 2017 131 026 A1 shown.
  • closed cross-cut welding device is not restricted to a state in which the upper and lower punches are in contact with one another in the plane of the paper web and the paper webs are clamped between them, but also includes those states in which the upper and lower punches are indeed moving towards one another, but are not yet arranged in the plane of the paper web.
  • the second conveying speed of the first pairs of endless elements of the longitudinal cutting welding devices is greater than the first conveying speed of the pairs of endless elements of the feeding devices, the first conveying speed of the pairs of Endless elements of the feeders is greater than zero.
  • open cross-cut welding device can be understood in the present case to mean a state in which an upper and lower punch of the cross-cut welding device are spaced apart from one another in such a way that they are not adjacent to one another in the plane of the paper web issue. In other words, in this open state, the paper webs do not rest against the upper and lower punches, which corresponds to continuous operation.
  • the feed devices when the cross-cut welding device is open, the feed devices set a first conveying speed of the pairs of endless elements that is greater than zero, while the first pairs of endless elements of the longitudinal cut-off welding devices are driven at a second speed, which in turn is greater than the first conveying speed.
  • first endless element and the second endless element of the pair of endless elements of the respective feed device are inclined to one another in the transport direction.
  • the goods to be packaged it is common for the goods to be packaged to be arranged between the upper and lower sheet or paper web.
  • the upper and the lower paper web are thus arranged on opposite sides of the packaged goods.
  • the upper and the lower paper web also run towards one another due to the relative inclination of the first and the second endless element in the transport direction downstream.
  • the angle of inclination between the first and the second endless element of the pairs of endless elements of the respective feed device is preferably constant. “Inclined to one another” is to be understood as meaning that the vertical spacing of the endless elements from one another decreases in the direction of transport.
  • the pairs of endless elements of the feed devices are jointly adjustable in height.
  • the packaging machine can also take into account and process goods to be packaged of different heights.
  • the height adjustment of the feeding devices can basically be realized manually, e.g. by means of an actuatable crank element, or automatically or motor-driven.
  • the height of the goods to be packaged can optionally also be recorded by suitable sensors in order to further increase the precision of the height adjustment.
  • the cross-cut welding device can of course also be designed to be height-adjustable.
  • the transverse separation welding device can also be designed to adjust only the separation welding plane in which the upper and lower punches meet.
  • the longitudinal cutting welding devices can also be designed to be height-adjustable for this purpose.
  • control device is designed to control the first drive device in such a way that the first conveying speed or a conveying period of the pairs of endless elements of the feed devices is linked to a height adjustment or height adjustment of the feed devices is adapted when the second conveyor speed is zero. This can prevent the upper or lower paper web from colliding with the transport device.
  • the lower punch of the cross-cut welding device must be guided upwards through the transport device from below (i.e. from below a support level of the packaged goods on the transport device).
  • a gap is left free between two successive transport devices through which the lower punch can be moved upwards.
  • the lower paper web also extends through this gap upstream of the transverse cut-off welding device, in order to finally converge with the upper paper web in the plane of the paper web.
  • the pairs of endless elements of the feed devices are jointly adjustable in height in order to be able to cope with different heights of the packaged goods. Since the angle of inclination between the first and the second endless element is preferably constant, there is a risk of a collision between the lower paper web and an edge due to the height adjustment of the feed devices, e.g. from a first packaged item to a higher second packaged item, and the associated height shift of the paper web plane the first of the two successive transport devices. In order to avoid such a collision, according to the invention the first conveying speed or the conveying period of the pairs of endless elements of the feed devices is adapted, that is to say increased in the present example.
  • the lower paper web can be relaxed in the transport direction and is accelerated relative to the previous state. In this way the lower paper web can be guided around the edge. Furthermore, the "pushing" by means of the feed device provides the lower as well as the upper paper web with enough play that the paper webs can wrap around the packaged goods and closing the transverse separation welding device does not tear any of the paper webs.
  • the pair of endless elements of the first and the second feed device each revolve in a plane of circulation, the planes of revolution of the pairs of endless elements each running perpendicular to the plane of the paper web and between them, in particular, orthogonal to the transport direction, define a distance.
  • the plane of rotation of the pair of endless elements of the first feed device and the plane of rotation of the pair of endless elements of the second feed device are aligned parallel to one another and parallel to the transport direction, the respective plane being at right angles to the plane of the paper web includes. Accordingly, a width or a distance is defined between the levels.
  • a distance perpendicular to the transport direction between the pairs of endless elements of the feed devices can be adjusted.
  • the packaging machine according to the invention is adjustable in width, so that a width of the outer packaging can be adapted to packaged goods of different shapes and widths.
  • the width between the two planes can be adjustable, for example, by means of a spindle which extends between the first and the second feed device.
  • a spindle can also be coupled very easily to the first drive device by means of an endless element.
  • the at least one pair of revolving endless elements for conveying the paper webs runs over at least two rollers each, wherein the first and the second feed device furthermore each have a first conveyor element and a having a second conveyor element, the first conveyor elements and the first endless elements of the pairs of endless elements of the feed devices pulling the upper paper web in between them on two longitudinal sides of the upper paper web opposite in relation to the transport direction, in particular and guiding them in an upper paper web plane, and wherein the second conveyor elements and the second endless elements of the pairs of endless elements of the feed devices pull in the lower paper web between them on two longitudinal sides of the lower paper web which are opposite with respect to the transport direction, in particular and in a lower paper web lead level.
  • the proposed arrangement provides that the driven pairs of endless elements of the feed devices do not clamp and guide the upper paper web and the lower paper web between them, but that a complementary conveyor element is provided for each endless element of the feed devices.
  • the conveying elements are preferably not driven.
  • the first conveyor element is designed as a first roller arrangement with at least two rollers for guiding the upper paper web
  • the second conveyor element is designed as a second roller arrangement with at least two rollers for guiding the lower paper web is formed.
  • roller arrangements instead of additional counter-endless elements enables a simpler and more compact design of the feed devices.
  • a rolling direction of the rollers of the first roller arrangement of the respective feed device and a rolling direction of the rollers of the second roller arrangement of the respective feed device run outwards at a roller angle relative to the transport direction.
  • the inclined position of the rollers of the first roller arrangement according to the invention results in a transverse tightening of the upper paper web and the inclined position of the rollers of the second roller arrangement results in a transverse tightening of the lower paper web.
  • the rollers of the respective roller arrangement can be coated, so that a non-slip gripping and holding of the paper webs is ensured.
  • the endless element has a rubberized surface, it can be advantageous to design the surface of the complementary rollers knurled in order to ensure that the paper webs do not slip between the conveyor elements and the endless elements as a result of the transverse force applied.
  • the first and the second feed device on the opposite longitudinal sides of the paper webs each have at least one pair of rollers arranged in the transport direction between the pairs of endless elements and the cross-cut welding device, a first Roller and a second roller of the respective roller pair are arranged on two opposite sides of the paper webs lying on top of one another with respect to the plane of the paper web.
  • a pair of rollers arranged in this way improves the feeding of the upper paper web and the lower paper web into the transverse separation welding device and thus enables a qualitatively better transverse separation welding of the paper webs.
  • this ensures that the cross-cut welding device, or its upper punch and lower punch, welds the upper paper web and the lower paper web while it runs essentially horizontally and in the plane of the paper web.
  • the first roll of the pair of rolls can be arranged above the plane of the paper web and the second roll of the pair of rolls can be arranged below the plane of the paper web, or vice versa.
  • the first roller and the second roller of the respective roller pair pull the upper paper web and the lower paper web between them and guide them in the paper web plane.
  • a rolling direction of the roller pair of the respective feed device is aligned parallel to the transport direction.
  • the axes of rotation of the rollers of the respective roller pair are aligned parallel to the plane of the paper web and orthogonally to the transport direction.
  • the unwinding direction of at least one roller of the roller pair of the respective feed device runs outwards at a pre-tensioning roller angle relative to the transport direction.
  • Such a pretensioning system can tighten the Paper webs can be achieved before entering the transverse or longitudinal cutting welding device.
  • a rolling direction of the first roller of the respective roller pair is aligned parallel to the transport direction, whereas a rolling direction of the second roller extends outwards relative to the transport direction at a pretensioning roller angle.
  • both rollers of the respective roller pair can also run outwards at a pre-tensioning roller angle relative to the transport direction.
  • one roller of the respective roller pair can, for example, have a rubberized surface, whereas the other roller of the same roller pair can, for example, have a knurled surface, which is preferably made of a metal .
  • the first and the second longitudinal cutting welding device each have at least one welding device, the welding device each having a heatable welding wheel for welding the paper webs and a pressure assembly for supporting the paper webs against the welding wheel wherein the pressure assembly has at least one pressure wheel, in particular two pressure wheels, the welding wheel being adjustable between a working position in which the pressure assembly rests against the welding wheel and a rest position in which the welding wheel is spaced apart from the pressure assembly, and wherein the welding device in each case has at least one prestressing element which prestresses the welding wheel into the rest position.
  • excessive heat input from the heated welding wheel onto the paper webs which can result, for example, when the paper web sections in the longitudinal severing welding devices come to a standstill, can be avoided by using the pretensioning element.
  • a standstill of the paper web sections can, for example, be intentional, for example in packaging machines operating in a clocked manner.
  • a paper web standstill can also occur due to a general machine standstill, be it intentional or unintentional due to a power failure or the like.
  • the paper webs lying on top of one another rest in the working position in a contact area on the welding wheel.
  • contact area is to be understood in the present case as the area in which the paper webs lying on top of one another touch the respective welding wheel or bear against it. It is thus to a certain extent a common contact section between the corresponding welding wheel and the paper webs lying on top of one another.
  • the contact area can, for example, be linear or flat.
  • a planar contact area is to be preferred to the linear contact area, since the heat transfer path of the paper web sections to be welded increases in the planar contact area. The shorter the heat transfer route, the hotter the welding wheel has to be to seal the paper webs.
  • the paper webs lying on top of one another are spaced apart from both the welding knife and the pressure assembly in the rest position.
  • the respective welding wheel is preferably arranged outside of the immediate vicinity (i.e. the area in which the paper webs are still welded despite the distance to the welding wheel, for example as a result of thermal radiation) of the paper webs or paper web sections in order to prevent further heat input from the Avoid welding wheel on the paper.
  • the welding wheel and the at least one pressure wheel of the pressure assembly are driven together or are arranged to run freely.
  • the welding wheel is designed as a rotating, heatable welding wheel.
  • the at least one pressure wheel is also designed to rotate.
  • One advantage of this embodiment is that the paper webs are transported through the respective welding device without slippage. In this way, the paper webs are not pulled by the welding devices compared to stationary welding and pressure wheels, so that comparatively less wear occurs when the paper webs run through the welding devices.
  • the welding wheel can be adjusted between the working position and the rest position orthogonally to the plane of the paper web.
  • the welding wheel is adjustable in height.
  • the height adjustment can take place, for example, along a vertical axis, i.e. parallel to a normal vector of the plane of the paper web. In this way, the hot welding wheel can be separated from the paper webs as quickly as possible when the pairs of endless elements of the longitudinal cutting welding devices are at a standstill.
  • an axis of rotation of the welding wheel is parallel to an axis of rotation of the at least one pressure wheel of the pressure assembly, the axis of rotation of the at least one pressure wheel within a width of the projection of the welding wheel onto the paper web plane lies.
  • the rolling direction of the welding wheel and the rolling direction of the at least one pressure wheel of the pressure assembly are each aligned parallel to the transport direction.
  • the width of the projection of the welding wheel onto the paper web plane thus also extends in the direction of transport.
  • the axis of rotation of the at least one pressure wheel is arranged within this projection width. In this way, compared to an arrangement outside the projection width, the heat transfer can be improved by enlarging the contact area.
  • a compact construction of the welding device can also be realized in this way. In view of the compact design, it can also be provided in particular that a diameter of the at least one pressure wheel is smaller than half the width of the projection of the welding wheel onto the paper webs.
  • the two pressure wheels are spaced from one another in the transport direction and are arranged with respect to the paper web plane on a first side of the paper webs lying on top of one another, which is opposite a second side of the paper webs lying on top of one another which the welding wheel is arranged.
  • the two pressure wheels of the respective welding device are spaced from one another and rest on the same side of the paper web, namely both on the side opposite the welding wheel.
  • the contact area lies, in particular centrally, between the two pressure wheels, and that the contact area is designed such that the paper webs lying on top of one another wrap around the welding wheel at least partially along an outer circumference.
  • One advantage of this embodiment is that a symmetrical contact area and thus a symmetrical force distribution is established with respect to a center plane of the respective welding wheel, which is aligned orthogonally to the plane of the paper web and contains the axis of rotation of the welding wheel.
  • the contact area is shifted closer to one of the two pressure wheels (e.g. to the pressure wheel upstream of the central plane or to the pressure wheel downstream of the central plane).
  • the two pressure wheels have the same diameter.
  • the welding wheel is arranged above the plane of the paper web, and that an outer circumference of the welding wheel extends below a plane which rests on the highest points of the two pressure wheels of the pressure assembly.
  • the term “highest point” can be understood to mean that point on the outer circumference of each pressure wheel which, in the rest position, has the minimum distance from the lower paper web.
  • the welding wheel is arranged below the plane of the paper web, and that an outer circumference of the welding wheel extends over a plane which rests on the lowest points of the pressure wheels of the pressure assembly.
  • the term "lowest point” can be understood to mean that point on the outer circumference of each pressure wheel which is at the minimum distance from the upper paper web in the rest position the outer circumference of the lower welding wheel does not extend beyond the level assigned to the lowest points of the two pressure wheels, an extended contact area and thus an improved heat transfer to the paper webs is set.
  • the diameter of the respective drive wheel is smaller than half the width of the projection of the welding wheel onto the paper webs.
  • the respective welding device is arranged in the transport direction in front of the first pairs of endless elements of the longitudinal cut-off welding devices.
  • each longitudinal cutting welding device furthermore has a longitudinal cutting device for cutting through the paper webs lying on top of one another, parallel to the transport direction, on two opposite longitudinal sides, the longitudinal cutting device having a rotating circular knife and one opposite to the plane of the paper web arranged support wheel for supporting the paper webs against the circular knife, wherein the circular knife and the support wheel extend in a circular knife plane which is arranged parallel to the transport direction, and that the first pair of endless elements of the respective longitudinal cut-off welding device revolves in a first plane of rotation, the first Circumferential plane and the circular knife plane each run perpendicular to the plane of the paper web, the first plane of rotation and the plane of the circular knife being arranged parallel to one another.
  • a rolling direction of the respective circular knife is arranged parallel to the first pairs of endless elements of the longitudinal cut-off welding devices, and in particular parallel to the transport direction.
  • the paper webs lying on top of one another are arranged between the rotating circular knife and the corresponding support wheel.
  • the rotating circular knife is preferably an unheated, mechanical separating element. In this way, there is no need to decouple the circular knife from the paper webs as a result of a power failure of the machine or a standstill of the paper webs.
  • the circular knives and the support wheels are driven, for example, by means of the second drive device.
  • a drive device different from the second drive device is also conceivable.
  • the first and the second longitudinal cutting welding device furthermore each have at least one second pair of circumferential endless elements which pull in the paper webs lying on top of one another on the two opposite longitudinal sides of the paper webs between them and guide in the paper web plane, the circular knives being arranged in the paper web plane orthogonally to the transport direction between the first pair of endless elements of the respective longitudinal cut-off welding device and the second pair of endless elements of the same longitudinal cut-off welding device.
  • the circular knife is arranged in the respective longitudinal cut-off welding device between the first pair of endless elements and the second pair of endless elements that the paper webs on the side of the circular knife facing the packaged goods and on the opposite side of the circular knife facing away from the packaged goods in the transport direction are guided by the first and the second pair of endless elements.
  • the second pair of endless elements of the longitudinal cut-off welding devices each revolve in a second circumferential plane, the second circumferential plane running parallel to the circular knife plane.
  • a parallel guidance of the paper webs using mutually spaced pairs of endless elements in the respective longitudinal severing welding device is preferable to a transversely outwardly inclined guidance of the paper webs.
  • the parallel guidance makes it possible to avoid possible crack propagation upstream of the respective longitudinal severing device, which could otherwise result from the transverse tightening.
  • the second plane of rotation is inclined with respect to the plane of the circular knife in order to cut off a lateral protrusion of paper.
  • the first and the second longitudinal cut-off welding device each have a pair of rollers arranged downstream of the second pairs of endless elements in the transport direction, the respective roller pair of the longitudinal cut-off welding devices being designed to draw in the two paper webs between them and guide them in the paper web plane, with the rollers of the respective roller pair running outwards at a pre-tensioning roller angle relative to the transport direction, in particular such that a paper overhang laterally separated by the longitudinal cutting device is transported away from the roller pair of the respective longitudinal cutting welding device.
  • the second drive device is designed to jointly drive the first pair of endless elements and the second pair of endless elements.
  • control of the longitudinal cut-off welding devices can be simplified in comparison with a separate drive.
  • a conveying speed of the second pairs of endless elements corresponds to the conveying speed of the first pairs of endless elements.
  • the longitudinal cutting device is arranged downstream of the respective welding device in the transport direction.
  • the paper webs lying on top of one another are first longitudinally welded in the transport direction and then fed to the longitudinal cutting device for cutting through the paper web regions lying on top of one another, parallel to the transport direction on two opposite longitudinal sides of the outer packaging.
  • the longitudinal cutting devices are also possible to arrange the longitudinal cutting devices next to or upstream of the welding devices in the transport direction.
  • the cross-cut welding device has a first punch and a second punch, the first punch having two heating devices spaced from one another by a first gap, the surfaces of which facing the second punch each have one Forms transverse welding surface, the transverse welding surfaces lying in a common welding surface plane parallel to the paper web plane, the second punch having two pressure receiving devices spaced from one another by a second gap, the pressure receiving devices forming a support surface facing the first punch, the second punch being in the second gap arranged separating knife, wherein the first gap of the first punch is arranged opposite to the second gap of the second punch, wherein the first and the second punch is orthogonal to the paper ba hnplane are movable relative to each other.
  • the first punch can be the upper punch or the lower punch and the second punch can be the other of the upper punch and the lower punch.
  • the first punch is the upper punch and the second punch is the lower punch.
  • Each of the pressure receiving devices in the second punch can be movably mounted, in particular resiliently, parallel to the plane of the separating gap.
  • the cutting knife is then firmly mounted in the second punch.
  • the cutting knife cannot be moved in the second punch.
  • the pressure receiving devices thus move relative to the cutting knife when a force is applied against the spring force of their resilient mounting in the separating welding plane.
  • each of the pressure receiving devices is fixedly mounted in the second punch parallel to the plane of the separating gap.
  • the cutting knife is then movably mounted in the second punch.
  • the cutting knife can be moved in the second punch, for example by means of an actuation device. This can be a pneumatic actuation device.
  • the movement of the cutting knife can be actively controlled, for example via the control device of the packaging machine.
  • the cutting knife thus emerges from the second gap either due to the resilient mounting or the movement by means of the actuating device and into the opposite first gap of the first punch.
  • the cutting of the paper webs does not take place over the entire width of the paper webs lying on top of one another.
  • the severing is preferably carried out in such a way that a continuous strip remains on both sides of the paper webs, which is used for conveying through the longitudinal severing welding devices and is preferably only severed in the longitudinal severing device.
  • the first punch and the second punch can be moved relative to one another orthogonally to the plane of the paper web in such a way that the transverse welding surface arranged upstream in the transport direction and the pressure receiving device arranged upstream in the transport direction abut one another, and that the transverse welding surface arranged downstream in the transport direction and the pressure receiving device arranged downstream in the transport direction bear against one another.
  • the pressure receiving devices are therefore each acted upon with a force by the two heating devices.
  • this counteracts the spring force of its resilient mounting. In this way it can be ensured that the film webs are mechanically severed by means of the severing knife and, in particular at the same time, are thermally sealed or welded to one another.
  • the pressure receiving devices are resiliently mounted in the second punch in such a way that the cutting knife is arranged retracted into the support surface when the support surface and the transverse welding surfaces are spaced apart, and that the cutting knife protrudes from the support surface and protrudes into the first gap when a sealing force is applied to the support surface in each case.
  • the packaging machine furthermore has at least one upper unwinding roller carrying the upper paper web and at least one lower unwinding roller carrying the lower paper web, in particular wherein the upper and lower unwinding reels can each be braked is.
  • the packaging machine furthermore has an adjustable oscillating roller assembly for guiding each of the upper and lower paper webs.
  • the pendulum assembly preferably has a number of upper deflecting rollers arranged perpendicular to the transport direction and a number of lower deflecting rollers arranged perpendicular to the transport direction.
  • the upper and the lower paper web are each alternately guided between the pendulum assembly and a complementary counter roller assembly, which is also arranged perpendicular to the transport direction.
  • the pendulum assembly is adjustable relative to the counter roller assembly. In this way, the respective paper web can be tightened and smoothed, for example when the machine is at a standstill.
  • the spherical roller assembly can be manually or motorized.
  • the packaging machine also has at least one upper pair of draw-in rollers and / or at least one upper draw-in roller for Unwinding the upper paper web from the upper unwinding roller and having at least one lower pair of intake rollers and / or at least one lower intake roller for unwinding the lower paper web from the lower unwinding roller, the upper and lower intake roller pairs being arranged in the transport direction between the self-aligning roller assembly and the feed devices.
  • a rolling direction of the intake roller pairs is arranged parallel to the transport direction.
  • the intake rollers of the upper pair of intake rollers are designed to draw in and guide the upper paper web between them.
  • the feed rollers of the lower pair of rollers are designed to draw in and guide the lower paper web between them.
  • the feed rollers preferably extend over the entire width of the respective paper web.
  • the packaging machine furthermore has a third drive device for driving the upper and lower intake roller pair and / or the at least one upper and lower intake roller.
  • control device is further designed to control the third drive device independently of the first and the second drive device.
  • control device is designed to control the third drive device in such a way that the intake roller pairs are driven at a third conveying speed.
  • a feed speed or conveying speed of the respective paper webs in continuous operation especially when the transverse separating welding device is open
  • the first and third drive devices can be driven without the second drive device being driven. In this way, as explained above, paper can be fed upstream of the cross-cut welding device.
  • the third drive device has a third motor.
  • the third motor is preferably different from the first and second motors.
  • the control device can in particular be designed to control the third motor, the first motor and the second motor. It can in particular be provided that the third drive device has a third motor, the third motor being different from the first and the second motor.
  • the first conveying speed of the pairs of endless elements of the feeding devices is greater than zero and the second conveying speed of the first pairs of endless elements of the longitudinal cutting-off welding devices is equal to zero.
  • the longitudinal cut-off welding device does not convey the paper webs any further.
  • the pairs of endless elements of the feed devices still push the paper webs in, while the punches of the cross-cut welding device move together. In this way, tearing of the paper webs during the cross-cut welding is avoided.
  • the second conveying speed of the first pairs of endless elements of the longitudinal cut-off welding devices is greater than the first conveying speed of the pairs of endless elements of the feeding devices, the first conveying speed of the pairs of endless elements of the feeding devices being greater than zero.
  • the conveying speed of the paper webs increases in the transport direction. Tight guidance of the paper webs can be achieved during continuous operation with the cross-cut welding device open.
  • the pairs of endless elements of the feed devices are jointly adjusted in height.
  • This setting can be made in particular if a maximum height of the packaged goods is to be changed. In principle, however, it is also conceivable to adjust the height when the height of the goods to be packaged changes between successive packaged goods.
  • the first conveying speed of the pairs of endless elements of the feed devices is increased when the height of the goods to be packaged increases between the two successive packaged goods or when a greater maximum height of the packaged goods is set.
  • the period of time over which the first conveying speed of the pairs of endless elements of the feed devices is greater than zero and the second conveying speed of the first pairs of endless elements of the longitudinal cut-off welding devices is equal to zero can also be increased.
  • a greater distance of the paper webs is then also pushed in when the longitudinal cut-off welding device no longer conveys the paper webs.
  • the first conveying speed of the pairs of endless elements of the feed devices is reduced when the height of the goods to be packaged decreases between the two successive packaged goods or when a lower maximum height of the packaged goods is set.
  • the period of time over which the first conveying speed of the pairs of endless elements of the feed devices is greater than zero and the second conveying speed of the first pairs of endless elements of the longitudinal cut-off welding devices is equal to zero can also be reduced. As a result, a shorter distance of the paper webs is then also pushed in when the longitudinal severing welding device no longer conveys the paper webs.
  • the first and the second longitudinal cutting welding device each have at least one welding device with a heatable welding wheel for welding the paper webs and a pressure assembly for supporting the paper webs against the welding wheel, the welding wheel between a working position in which the pressure assembly rests against the welding wheel, and a rest position in which the welding wheel is spaced apart from the pressure assembly, the welding wheel is moved from the working position into the rest position as soon as the paper webs are conveyed in the longitudinal severing welding devices was stopped, and the welding wheel is moved again into the working position before the paper webs are conveyed again through the longitudinal cut-off welding devices.
  • the packaging machine furthermore at least an upper pair of intake rollers for unwinding the upper paper web from an upper unwinding roller and at least one lower intake roller pair for unwinding the lower paper web from a lower unwinding roller, the upper paper web and the lower paper web being conveyed into the feed devices by means of the intake roller pairs, the intake roller pairs with a Third speed are driven, which is less than the first conveying speed of the pairs of endless elements of the feed devices.
  • the packaging machine can provide at least three speed levels which increase in the transport direction, so that the paper webs are conveyed through the entire packaging machine in a taut manner.
  • first and the second longitudinal separation welding device furthermore each have at least one second pair of endless elements running over at least two rollers for guiding the paper webs in the paper web plane, the second Pairs of endless elements of the feed devices are driven at the second conveying speed of the first pairs of endless elements of the longitudinal cut-off welding devices.
  • the paper webs can be drawn at the highest speed in the longitudinal cut-off welding device.
  • the endless elements also enable the paper webs to be driven without damaging the paper webs.
  • Fig. 1 shows a packaging machine 10 in a schematic view.
  • the packaging machine 10 is used to provide packaged goods 12 with outer packaging.
  • the packaged goods 12 are transported through the packaging machine 10 in a transport direction T.
  • the packaged goods are wrapped by the packaging machine 10 with an upper paper web 14, which is unwound from an upper supply or unwinding roller 15, and a lower paper web 16, which is unwound from a lower supply or unwinding roller 17.
  • This type of wrapping corresponds to the principle of the series packing machine.
  • the upper paper web 14 and the lower paper web 16 are fed by means of a first feed device 18 and a second feed device 18 '.
  • the upper paper web 14 and the lower paper web 16 converge in a paper web plane 19 in which they are conveyed through the packaging machine 10 and processed.
  • the paper webs 14, 16 are preferably inclined to one another.
  • the paper web plane 19 can be that plane in which, for example, a transport device for transporting the packaged goods is arranged.
  • the paper web plane can, however, also be provided, for example, at approximately half the height of the packaged goods 12, as is shown with a paper web plane 19 '.
  • the paper web plane 19 can be adjustable in height. The packaged goods 12 thus move into the upper paper web 14 and lower paper web 16 converging on one another.
  • the wrapped packaged goods 12 reach a transverse severing welding device 20.
  • the transverse severing welding device 20 closes the paper webs 14, 16 transversely to the transport direction and at least partially cuts through the paper webs 14, 16, so that the packaged goods 12 no longer come into contact with the packaged goods 12 preceding them along the weld seam Has.
  • the packaged goods 12 then pass through a first longitudinal cut-off welding device 22 and a second longitudinal cut-off welding device 22 ', which are provided to weld the paper webs 14, 16 together on opposite sides of the paper webs parallel to the transport direction T on the sides of the packaged goods 12 and to create a lateral paper overhang of the paper webs 14, 16 to be separated.
  • the first longitudinal cut-off welding device 22 and a second longitudinal cut-off welding device 22 ′ form a longitudinal cut-off welding system 21.
  • the side of the packaged goods facing opposite to the transport direction T is also welded and trimmed by the transverse separation welding device 20.
  • the packaged item 12 is now welded and trimmed on all four sides, so that the packaged item 12 is completely surrounded by a paper envelope.
  • the packaging machine 10 has a first drive device 24 for driving the first feed device 18 and the second feed device 18 ′.
  • the packaging machine 10 has a second drive device 26 for driving the first longitudinal cut-off welding device 22 and the second longitudinal cut-off welding device 22 ′.
  • the packaging machine 10 can have a control device 27.
  • the control device 27 is preferably designed to control the first drive device 24 and / or the second drive device 26.
  • the sequence of the transverse cut-off welding device 20 and the longitudinal cut-off welding devices 22, 22 ' is shown only by way of example in a preferred configuration.
  • the sequence of these devices can also be different, for example it can be provided that the transverse cut-off welding device 20 be arranged after the longitudinal cut-off welding devices 22, 22 '.
  • At least one further module 28 is connected, which processes the paper webs 14, 16 that are welded to one another.
  • a labeler can be provided (not shown) which applies a label to at least one of the paper webs 14, 16.
  • a separating station can be provided which separates and re-welds any excess paper that is still present after it has passed through the longitudinal separating welding devices 22, 22 ', lying close to the packaged goods. This can be provided in particular for packaged goods with changing widths.
  • a paper return 30 can also be provided, which serves to take up the excess paper cut off in the longitudinal severing welding devices 22, 22 'so that it can be recycled.
  • the packaging machine 10 has adjustment devices 32 which are used to adjust the packaging machine 10 to a height and a width of the packaged goods 12. Possible configurations of the feed devices 18, 18 ', the transverse cut-off welding device 20 and the longitudinal cut-off welding devices 22, 22' are explained in more detail with a view to the figures.
  • Fig. 2 shows a side view of an embodiment of a feed device 18. The side of the feed device 18 facing the packaged goods 12 is shown.
  • the first feed device 18 and the second feed device 18 ′ are arranged opposite one another with respect to the transport direction T.
  • the configuration of the feed devices 18, 18 'explained below is only based on the feed device 18, but essentially also applies to the other of the two feed devices 18, 18'.
  • a pair of endless elements 34 is provided in the feed device 18, 18 'for transporting and fixing the paper webs 14, 16.
  • the pair of endless elements 34 in the present case has an upper endless element 34 'and a lower endless element 34 ".
  • the upper endless element 34' revolves around two rollers 36, 38.
  • the lower endless element 34" revolves around two rollers 40, 42.
  • the feed device 18, 18 ′ has a first conveying element 44 and a second conveying element 46.
  • the upper endless element 34 'and the first conveyor element 44 are arranged on two opposite sides of the upper paper web 14 with respect to the upper paper web 14 and pull the upper paper web 14 between them and feed it to the paper web plane 19, 19'.
  • the lower endless element 34 ′′ and the second conveyor element 46 are arranged on two opposite sides of the lower paper web 16 with respect to the lower paper web 16 and draw the lower paper web 16 between them and feed it to the paper web plane 19, 19 '.
  • the first conveyor element 44 is in the present case designed as a roller arrangement with three rollers 44-1, 44-2 and 44-3
  • the second conveying element 46 in the present case as a roller arrangement with three rollers 46-1, 46-2 and 46-3 Fig. 2
  • the pair of endless elements 34 may be inclined to one another.
  • the Fig. 2 a motor 48 for driving the pair of endless elements 34.
  • the motor 48 is mounted, for example, on a holder 50 of the feed device 18 and drives a first drive element 54 via a first wheel mechanism 52.
  • a second drive element 56 is also provided.
  • the second drive element 56 can be moved via a second wheel mechanism 58.
  • the first wheel mechanism 52 and the second wheel mechanism 58 share a common deflection wheel 60.
  • the first drive element 54 and the second drive element 56 are operatively connected to one another via the common deflection wheel 60.
  • the second drive element 56 meshes with the roller 38 of the upper endless element 34 'and the roller 42 of the lower endless element 34 ".
  • a pair of rollers 62 can be provided in the transport direction T downstream with respect to the pair of endless elements 34.
  • the pair of rollers 62 has a first roller 62-1 and a second roller 62-2.
  • the first roller 62-1 and the second roller 62-2 are designed to pull the fed paper webs 14, 16 between them on a longitudinal side and to convey them in the paper web plane 19, 19 '. It can be provided that the rolling direction of the roller pair 62 is parallel to the transport direction T is aligned. In Fig. 2 it can be seen that the first roller 62 - 1 and the second roller 62 - 2 of the roller pair 62 also mesh with the second drive element 56.
  • Fig. 3 shows a plan view of an embodiment of the feed devices 18, 18 '.
  • the same elements are provided with the same reference symbols and are not explained in more detail.
  • the paper webs 14, 16 Before the paper webs 14, 16 are fed to the transverse welding device 20 in the transport direction T, the paper webs 14, 16 can in particular be subjected to transverse tightening in the feed devices 18, 18 '.
  • a rolling direction of the rollers 44-1, 44-2 and 44-3 of the first conveyor element 44 and a rolling direction 68 of the rollers 46-1, 46-2 and 46-3 of the second conveyor element 46 relative to the transport direction T runs outwards at a roller angle 70.
  • a rolling direction of the pair of endless elements 34 is aligned parallel to the transport direction T.
  • first feed device 18 and the second feed device 18 ′ are driven via a common motor 48.
  • a shaft 64 extending between the first feed device 18 and the second feed device 18 ′ can be provided.
  • the shaft 64 is preferably aligned orthogonally to the transport direction T.
  • the shaft 64 is non-rotatably fixed at its two opposite ends with a wheel 66, cf. Fig. 2 , of the first wheel mechanism 52 connected. In this way, a circulating movement of the first drive element 52 of the first feed device 18 can be transferred equally to a circulating movement of the first drive element 52 of the second feed device 18 '.
  • a rolling direction of the pair of rollers 36, 38 of the upper endless element 34 'or of the pair of rollers 40, 42 of the lower endless element 34 is formed parallel to the transport direction T. In this way, the endless elements 34' and 34" move, ie parallel to the direction of transport.
  • the rolling direction of the non-driven rollers 44 - 1, 44 - 2 and 44 - 3, as stated above, is inclined by the roller angle 70 with respect to the transport direction T. In this way, good guidance and transverse tightening of the paper webs can be produced without stressing them too much and possibly tearing them. Wandering of the paper webs 14, 16 is avoided since the unwinding directions 68 of the opposing rollers 44-1, 44-2 and 44-3 of the two feed devices 18, 18 'point away from one another and each point outwards.
  • the unwinding direction 68 of the first roller 62-1 and the second roller 62-3 is also parallel to the transport direction.
  • the first roller 62-1 and the second roller 62-2 are disposed downstream between the respective upper and lower endless members 34 ', 34 "and the cross-cut welding device.
  • the first roller 62-1 and the second roller 62-3 pull the first and second rollers This takes place on both sides of the packaged goods 12.
  • the paper webs 14, 16 are then guided together in the paper web plane 19 and are drawn into the respective longitudinal cut-off welding device 22 or 22 'after the cross-cut welding device 20.
  • two rails 72 and 72 ' are provided, one of which is assigned to a feed device.
  • the respective rail 72, 72 ' is arranged on the inside, i.e. in the direction of the packaged goods, of the upper endless element 34' of the respective feed device 18, 18 '.
  • the upper paper web 14 can slide on these rails 72, 72 'and is kept slightly open on the inside, ie where the packaged goods 12 are arranged, in order to simplify the entry of the packaged goods 12 between the upper paper web 14 and the lower paper web 16 .
  • the configuration of the rollers 62-1 and 62-3 can be designed to ensure that the paper webs 14, 16 are drawn in and guided properly.
  • one of the rollers for example the roller 62-2, can be designed with a corrugated surface, the roller 62-1 or the respective other roller can be rubberized.
  • Fig. 5 a schematic view for explaining the feeding of the upper paper web 14 and the lower paper web 16 is shown.
  • the packaged goods 12 arrive in the transport direction T on a conveyor belt 80.
  • a downstream end of the conveyor belt 80 is denoted by the reference numeral 82.
  • the conveyor belt 80 and a subsequent conveyor belt 84 form a punch gap between them, in which the cross-cut welding device 20 is arranged.
  • An upper punch 86 and a lower punch 88 of the cross-cut welding device separate and weld the upper paper web 14 and the lower paper web 16 at the punch gap.
  • the punch gap is denoted generally by the reference symbol 85.
  • the upper punch 86 and the lower punch 88 weld or seal the upper paper web 14 and the lower paper web 16 with one another and separate the two paper webs at least partially transversely to the transport direction T.
  • the upper paper web 14 and the lower paper web 16 only remain on their left and theirs on the right-hand side are still connected to one another and are thus drawn into the longitudinal cut-off welding device, as will be explained in more detail below.
  • the packaged goods 12 have a height H. Half the height of the packaged goods 12 is designated by H / 2.
  • the paper web plane 19 is shown by means of a dashed line.
  • a height H max This is the maximum height of a packaged item 12 that can be processed. This height is the height of the upper endless element 34 'above the conveyor belt 80. The lower endless element 34 ′′ is below the conveyor belt 80. Half the height between the upper and the lower endless element, where the paper web plane 19 is located, is thus below half Packaged goods height H / 2.
  • the first feed device 18 and the second feed device 18 ' are entirely adjustable in height.
  • the upper endless element 34 'and the lower endless element 34 are also adjustable in height together with the rail 72.
  • the packaging machine can be set to a desired maximum height H max .
  • H max adjustable between 0 and 100 mm.
  • the cross-cut welding device 20 is shown in a closed position. Since paper is a material which is not stretchable and which tears when stretched at high levels, the upper paper web 14 and the lower paper web 16 must be "pushed in” when the cross-cut welding device closes. Overall, the operation of the packaging machine 10 is clocked. This means that when the transverse cut-off welding device 20 is closed, the longitudinal cut-off welding device is at a standstill, the speed of the second drive device 26 is then 0. However, the first drive device 24 of the feed devices 18 and 18 'is not stopped immediately. The reason for this is as follows.
  • the points S and S ' are schematically shown in FIG Fig. 5 drawn. These are the upper and lower points of an upstream side of the in Fig. 5 packaged goods designated by the reference numeral 12 '.
  • the upper paper web 14 and the lower paper web 16 are welded to one another and separated in the paper web plane 19.
  • the upper paper web 14 must therefore extend down to the packaged goods 12 ′ as far as the paper web plane 19.
  • the upper and the lower paper web run upstream between the upper punch 86 and the lower punch 88 and then to the respective upper endless element 34 'and lower endless element 34 ".
  • the upper paper web 14 and the lower paper web 16 do not run in a straight line between the upper endless element 34 'and the point S or from the lower endless element 34 "at the point S' 16, the paper webs are guided by rollers 62-1 and 62-2 in the paper web plane 19.
  • a sufficient amount of paper or paper path of the upper paper web and the lower paper web 16 must be available so that the paper webs 14, 16 can be merged from points S and S 'into the paper web plane 19 and can be welded to one another there without the paper webs 14 and 16 tear.
  • the paper webs 14 and 16 must be conveyed further by the feed devices 18, 18' for a certain period of time.
  • the period of time over which the feed devices 18 and 18 'have to run or "push" depends on their conveying speed. It is crucial that the upper paper web 14 and the lower paper web 16 are pushed in a sufficient length. This depends on the height setting H max. On the one hand, the height setting H max changes the vertical distance between points S and S '. Naturally, a higher packaged item 12 'requires a larger amount of material so that the upper paper web 14 and the lower paper web 16 can be brought together on its upstream side.
  • the height H max is set higher, the height of the lower endless element 34 ′′ is brought closer to the conveyor belt 80.
  • the The upper punch 86 and the lower punch 88 meet in the paper web plane 19, so that the lower paper web 16 runs around the end 82 due to its low tension Fig. 5 refer to.
  • the first drive device 24 and the second drive device 26 are provided, which can provide two separate conveying speeds independently of one another.
  • the two drive devices 24 and 26 allow the upper paper web 14 and the lower paper web 16 to close in the transport direction through the packaging machine 10 with increasing conveying speed convey, the conveying speed of the first drive device 24 or the feed devices 18, 18 'corresponds to approximately 80% of the conveying speed of the longitudinal cut-off welding devices 22, 22'.
  • the amount of this "pushing" can be set and stored as a function of the height setting of the feed devices 18, 18 ', so that a height setting of the pocket formed by the upper paper web 14 and the lower paper web 16 and the maximum packable item 12 can be set .
  • the term "drive device” is to be understood independently of the number of motors and the mechanical coupling.
  • a motor can be provided for the first drive device or the second drive device, which is then mechanically coupled to the feed devices 18, 18 'or the longitudinal cut-off welding devices 22, 22' on both sides.
  • a plurality of motors can also be provided within each of the drive devices, in which case at least one motor is provided for each of the feed devices 18, 18 'or longitudinal cut-off welding devices 22, 22'. These must then be regulated in parallel.
  • the feeding of the upper paper web 14 and the lower paper web 16 is then ended by stopping the first drive device 24. It can further be provided that upstream, in particular on the upper unwinding roller 15 and the lower unwinding roller 17, a brake is provided, which is actuated simultaneously around the to stop the upper paper web 14 and the lower paper web 16 immediately. In this way, after-running due to the inertia of the paper webs 14, 16 is avoided and the paper webs 14, 16 stop immediately when the first drive device 24 stops, whereby they do not lose any tension in the transport direction T.
  • Fig. 6 shows a lateral cross-sectional view through the transverse cut-off welding device 20. Identical elements are identified with the same reference symbols and will not be explained again.
  • the upper punch 86 and the lower punch 88 are each designed as it were in two parts.
  • the welding elements of the upper punch 86 form a welding surface plane 90 facing the lower punch 88.
  • the corresponding elements of the lower punch 88 form a welding surface plane 91 facing the upper punch 86.
  • Hold-down devices 110 and 112 are usually provided which, on the one hand, have a safety function and prevent reaching into the heated elements of the upper punch or reaching into the closed cross-cut welding devices. Furthermore, they can hold down the paper webs 14, 16 lying on top of one another during the welding process.
  • the hold-down devices 110, 112 can be arranged in a fixed manner in the upper punch 86 and move laterally past the lower punch 88. Correct mobility of the hold-down devices 110, 112 in the upper punch 86 can also be provided so that they come to rest on the lower punch 88, but the upper punch 86 can then move further down and until the welding surface planes 90 and 91 coincide in the paper web plane 19 .
  • the upper punch 86 has a first punch part 92 and a second punch part 94.
  • a first heating cartridge 96 or another suitable heating device is arranged in the first stamp part 92.
  • a second heating cartridge 98 or another suitable heating device is arranged in the second stamp part 94.
  • the Heating devices 96 and 98 can also be connected to one another or designed as a heating device.
  • the first stamp part 92 and the second stamp part 94 are spaced apart from one another by a gap 95 in the transport direction. Their surfaces 93 and 93 ′ facing the lower punch 88 form the welding surface plane 90.
  • the first and the second die parts 92, 94 are heated to a temperature which enables the upper and lower paper webs 14, 16 to be welded together.
  • the upper and lower paper webs 14, 16 are provided with a suitable coating on their mutually facing surfaces which, when heated sufficiently, weld or stick to one another.
  • first counter-pressure element 106 is part of a first pressure absorbing device 100 and the second counterpressure element 108 is part of a second pressure absorbing device 102.
  • the pressure absorbing devices 100, 102 each have a spring element 105, 105 '. In this way it is possible for the first counter-pressure element 106 and the second counter-pressure element 108 to be able to deflect by a spring travel F.
  • a separating knife 104 located in a gap 103, which lies opposite the gap 95 above the paper web plane 19, emerges.
  • the first pressure receiving device 100 and the second pressure receiving device 102 are spaced apart by a gap 103.
  • the cutting knife 104 is stationary in the gap. If the first counter-pressure element 106 and the second counter-pressure element 108 spring in, the separating knife 104 passes through the welding surface plane 91 or the paper web plane 19 and into the gap 95.
  • the cutting knife can also be moved by means of an actuation device which, for example, is pneumatically designed.
  • the pressure receiving devices 100, 102 can then be designed to be stationary. In this way, the upper paper web 14 and the lower paper web 16 can be cut through or separated.
  • a weld of the upper paper web 14 and the lower paper web 16 is produced on both sides of the cut by the welding surface 93 the first counter-pressure element 106 and the welding surface 93 'comes to rest on the second counter-pressure element 108, the paper webs 14, 16 being clamped.
  • the paper webs 14 and 16 are not moved further in the transport direction T when the cross-cut welding device 20 is closed. This is followed by an input of heat which welds or glues the paper webs 14, 16 to one another.
  • the cutting knife 104 cuts them through at the same time.
  • the upper punch 86 and the lower punch 88 are then moved away from one another and the paper webs 14, 16 can move on in the transport direction T. In this way, a clocked cross-cut weld is implemented.
  • the Fig. 7 shows a side view of an embodiment of the longitudinal cut-off welding device 22.
  • the longitudinal cut-off welding device 22 has a structure which corresponds to that of the longitudinal cut-off welding device 22 '.
  • the longitudinal cut-off welding devices 22 and 22 ′ then together form a longitudinal cut-off welding system 21.
  • the longitudinal cut-off welding devices 22 and 22 ' are arranged opposite one another. You then weld two paper webs 14, 16 lying on top of one another on opposite sides of the paper webs 14, 16 or of the packaging machine 10.
  • the longitudinal cut-off welding device 22 has a first pressure wheel 122 and a second pressure wheel 124. In principle, a different number of pressure wheels can also be provided.
  • the first pressure wheel 122 and the second pressure wheel 124 form a pressure assembly 125.
  • the pressure assembly 125 cooperates with a welding wheel 120.
  • the welding wheel 120 is heated.
  • the arrangement of the longitudinal cut-off welding device 22 is such that the paper web plane 19 intersects the welding wheel 120. In other words, the welding wheel 120 protrudes into the paper web plane 19.
  • the paper webs 14, 16 are thus passed in an approximately S-shape between the welding wheel and the first pressure wheel 122 and the second pressure wheel 124.
  • the first pressure wheel 122 and the second pressure wheel 124 are in the illustrated embodiment only mounted on ball bearings and not driven itself.
  • the heated welding wheel 120 is also not driven. In principle, however, it can also be driven.
  • the welding wheel In the representation of the Fig. 7 the welding wheel is shown in a working position. In the working position, it protrudes through the plane 19 of the paper web. In the working position, the welding wheel 120 rests against the first pressure wheel 122 and the second pressure wheel 124 or the paper webs 14, 16 pass between the welding wheel 120, the first pressure wheel 122 and the second pressure wheel 124. A preloading element 126 is provided that preloads welding wheel 120 into a rest position. In the rest position, as will be explained below, the welding wheel 120 is spaced apart from the first pressure wheel 122 and the second pressure wheel 124. The paper web plane 19 then runs freely between the welding wheel 120, the first pressure wheel 122 and the second pressure wheel 124. The welding wheel 120 is then spaced so far from the paper web plane 19 that no more heat is introduced into the paper webs 14, 16 due to radiant heat, which could damage them, even if the paper webs 14, 16 are stationary for a long time.
  • an adjusting device 128 is provided which moves the welding wheel 120 against the force of the pretensioning element 126 into the position shown in FIG Fig. 7 shown working position presses.
  • the configuration of the adjusting device 128 and of the pretensioning element 126 can be suitably selected.
  • a mechanical implementation can be selected in which the pretensioning element is a spring element and the adjusting device is an actuator, for example pneumatically operated.
  • An electromagnetic solution can also be selected in which the prestressing element 126 is provided by permanent magnets and the adjusting device 128 by an electromagnet or a coil that can be charged with current.
  • a combination of these elements can also be selected.
  • the welding wheel 120 is prestressed into the rest position by means of the prestressing element 126. This has the effect that, for example, in the event of a power failure, the welding wheel 120 automatically jumps into the rest position.
  • a first endless element 134 and a second endless element 136 are provided to drive the upper paper web 14 and the lower paper web 16. In the embodiment shown, these are designed as belts.
  • the first endless element 134 revolves over rollers 138-1, 138-2 and 138-3.
  • the endless element 134 is driven via the roller 138-2.
  • a corresponding structure results for the endless element 136. This circulates over rollers 140-1, 140-2 and 140-3. The endless element 136 is driven via the roller 140-2.
  • a rotating cutting knife 130 is arranged downstream of the welding wheel 120. This rests on a support wheel 132.
  • the paper webs 14, 16 run through the cutting knife 130 resting on the support wheel 132 and are cut by the cutting knife 130 parallel to the transport direction T.
  • both the cutting knife 130 and the support wheel 132 are driven.
  • the Fig. 8 shows the longitudinal cut-off welding device 22 of FIG Fig. 7 with an isometric view and one of the Fig. 7 opposite direction of view.
  • a common drive is provided for the endless elements 134, 136, the second drive device 26.
  • the second drive device 26 drives a further endless element 148, which rotates over several rollers 150-1 to 150-7.
  • the roller or wheel 150-7 drives the roller 138-2.
  • the roller or wheel 150-6 drives the roller 140-2.
  • a schematically illustrated wheel or roller 150-4 is then provided, which is coupled to the drive device 26.
  • a single motor can also be provided, which drives the mutually opposite longitudinal cut-off welding devices 22 and 22 '.
  • a heating device is shown schematically and denoted by 152. This heats the welding wheel 120. Corresponding heat-conducting elements are not shown and transport the heat from the heating device 152 to the welding wheel 120 through the longitudinal cut-off welding device 22.
  • the Fig. 9 shows schematically in plan view the mode of operation of the longitudinal severing welding device 22. Only one side of the packaged goods 12 and the upper paper web 14 is shown. A long side of the paper web 14 is designated by 180. The paper web 14 has already been welded transversely to the lower paper web 16 lying therebelow. The transverse separation is shown schematically at 160. Turning to the Fig. 8 the endless elements 134 and the wider endless element 144 can be seen. The endless member 144 is as in FIG Fig. 9 recognizable, arranged on the side facing away from the packaged goods and primarily promotes the paper webs that are not transversely welded and separated there at their outer edge.
  • the endless element 134 conveys the webs further inward on the side facing the packaged goods 12 of both the welding wheel 120 and the cutting knife 130. It can also be seen that the welding wheel 120 is arranged upstream of the cutting knife. Thus, the paper webs 14, 16 are first welded by means of the welding wheel and then separated from one another by means of the separating knife.
  • the cutting knife can be arranged relative to the welding wheel, so that the cutting takes place within the width of the weld. However, it can also be provided that the weld is not severed, but rather that the separation takes place just laterally outside the weld.
  • waste strips of the upper and lower paper webs 14, 16, which are denoted by reference numeral 158 are then carried away.
  • a pair of rollers 156 can be provided which is inclined outwardly relative to the transport direction, that is to say that a rolling direction encloses an angle with the transport direction T, in such a way that the waste strip 158 is conveyed away laterally outward. In principle, however, the waste strip 158 can also be poorly guided away downwards into a collecting container.
  • the welding wheel 120 with the first pressure wheel 122 and the second pressure wheel 124 is shown cut away.
  • the welding wheel 120 is moved to the rest position.
  • the paper web plane 19 then runs freely between the welding wheel 120 and the first pressure wheel 122 and the second pressure wheel 124.
  • FIG 10B an enlarged side view is shown.
  • a stroke 154 is shown schematically, by which the welding wheel 120 is moved at least between the working position and the rest position, so that the paper web plane 19 can pass freely between the welding wheel 120, the first pressure wheel 122 and the second pressure wheel 124.
  • the Figure 10B So shows the working position and the Figure 10A the rest position.
  • a pressure area of the welding wheel 120 is designated by 162. It is the angular range between the contact points between the welding wheel 120 and the first pressure wheel 122 on the one hand and the second pressure wheel 124 on the other side. Due to the pressure area, a sufficiently large angular range is provided in which the paper webs run along the welding wheel 120, so that a sufficiently large heat input takes into account the conveying speed and the paper webs are welded to one another.
  • the welding wheel 120 protrudes through the plane 164 with part of its circumference.
  • the paper webs 14, 16 must traverse a substantially “S” -shaped stretch along the pressure region 162.
  • FIG. 10 shows an isometric view of an embodiment of the packaging machine 10.
  • FIG. 11 should once again in addition to the merely schematic view in Fig. 1 the overall structure will be explained. The same elements are identified by the same reference symbols.
  • the transport direction T, the packaged goods 12 and a conveyor belt 80 on which the packaged goods 12 enter the packaging machine 10 are shown again.
  • the isometric View of Fig. 11 is in side view in the Fig. 12 and in plan view in the Fig. 13 shown. All three figures are described below across all figures.
  • An upper unwind roll 170 is provided from which the upper paper web 14 is unwound.
  • Another supply roll 172 is shown, which can already be scaffolded. In this way, when the roll 170 is unwound, it is possible to change over to the next roll.
  • the same possibility is available for the lower paper web 16 and is shown schematically in FIG Fig. 12 shown.
  • the upper paper web 14 runs over an upper draw-in roller 174, which can also be designed as a pair of draw-in rollers.
  • the feed roller 174 can already be driven and have a drive device in order to promote the unwinding from the unwinding roller 170 in this way.
  • the unwinding roll 170 itself is rotatably mounted.
  • a brake device 171 is provided for the supply roll 170. In this way, the supply reel 170 can be stopped. In this way, in the clocked operation of the packaging machine 10, it is possible, in particular, to immediately brake a paper web running on when the first drive device 24 and the second drive device 26 are at a standstill. In this way the tension of the paper web can be maintained.
  • a pendulum roller assembly 176 is then provided, which is also used to tighten and safely guide the paper web.
  • Such self-aligning roller assemblies are used in a manner known per se for a variety of objections.
  • Another draw-in roller or a further pair of draw-in rollers is denoted by the reference numeral 178.
  • This pair of intake rollers can in principle also be driven by means of its own drive device.
  • the paper web then runs into the feed device 18 '. In this way, the upper paper web 14 runs over three driven rollers 174, 178 and the feed device 18.
  • the conveying speed increases successively in the transport direction T, so that the tightening of the paper web is ensured over the entire conveying length.
  • the longitudinal cut-off welding device 22 then provides the highest conveying speed.
  • the feed devices 18 and 18 ′ are arranged on both sides of the conveyor belt 80 next to the conveyor belt 80.
  • the packaged goods 12 thus run between the feed devices 18 and 18 '.
  • the feed devices 18 and 18 ' are, however, arranged in the transport direction T essentially in alignment with the longitudinal cut-off welding devices 22 and 22'.
  • FIG. 3 shows a schematic flow diagram of a method for operating a packaging machine 200.
  • a packaging machine is provided.
  • the packaging machine has a transport device 80, 84 for transporting packaged goods in a transport direction T.
  • a transverse cut-off welding device, the first and the second feed devices 18 and 18 'and the first and the second longitudinal cut-off welding device 22 and 22' are provided.
  • the longitudinal cut-off welding devices 22 and 22 ' are driven at a second conveying speed.
  • conveying takes place at the same time in the feed devices 18 and 18 'at a first conveying speed. The first and second conveying speeds differ.
  • the first conveying speed of the pairs of the endless elements of the feed devices 18 and 18 ' is greater than 0 and the second conveying speed of the first pairs of endless elements of the longitudinal cut-off welding devices 22, 22' is equal to 0.
  • the second conveying speed of the first pairs of endless elements of the longitudinal cut-off welding devices 22, 22 ' is greater than the first conveying speed of the pairs of endless elements of the feeding device, the first conveying speed of the pairs of endless elements with feeding devices being greater than is 0. This can be the case during the entire period of time when the cross-cut welding device is open.
  • the method 200 ends.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
EP21160299.0A 2020-03-05 2021-03-02 Machine d'emballage et procédé d'emballage d'un produit à emballer avec un emballage extérieur produit à partir d'une bande supérieure de papier et d'une bande inférieure de papier Pending EP3885274A3 (fr)

Applications Claiming Priority (1)

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DE102020106025.4A DE102020106025B4 (de) 2020-03-05 2020-03-05 Verpackungsmaschine und Verfahren zum Verpacken eines Packguts mit einer aus einer oberen Papierbahn und einer unteren Papierbahn erzeugten Umverpackung

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EP3885274A2 true EP3885274A2 (fr) 2021-09-29
EP3885274A3 EP3885274A3 (fr) 2022-01-05

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DE102020106025B4 (de) 2024-01-18
EP3885274A3 (fr) 2022-01-05

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