WO2017092994A1

WO2017092994A1 - Device and method for forming at least one web of 3-edge sealed pouches

Info

Publication number: WO2017092994A1
Application number: PCT/EP2016/077197
Authority: WO
Inventors: Ralf Frulio; Maik LAMPRECHT; Michael LOPES
Original assignee: Robert Bosch Gmbh
Priority date: 2015-11-30
Filing date: 2016-11-10
Publication date: 2017-06-08
Also published as: DE102015223721A1; EP3383748A1; JP2018535162A

Abstract

The invention relates to a device (10a-d) for forming at least one web (12a-d) of 3-edge sealed pouches (14a-d), in particular stick packs, along a vertical transport path (16a-d) from at least one material web (16a-d), comprising at least one molding device (20a-d) which is designed to mold the material web (16a-d) into a film tube (22a-d), at least one longitudinal sealing unit (24a-d) which is designed to seal the film tube (22a-d) in a longitudinal direction (26a-d), at least one transverse sealing unit (28a-d) which is designed to separate the film tube (22a-d) into sections (32a-d) by forming transverse sealing seams (30a-d), each section forming one of the 3-edge sealed pouches (14a-d), and at least one drawing device (34a-d) which has a first cyclically moving transport element (38a-d) and at least one additional transport element (40a-d) in order to transport the film tube (22a-d) in a continuous transport movement (36a-d). The additional transport element (40a-d) is designed to transmit the transport movement (36a-d) to the film tube (22a-d) at least during a return movement (42a-d) of the first transport element (38a-d) opposite the transport movement (36a-d).

Description

DEVICE AND METHOD FOR MAKING

AT LEAST ONE TRACK OF 3-ROD SEAL BAGS

description

State of the art

It is already an apparatus for forming at least one web of 3-edge sealed bags, in particular stick packs, of at least one material web, along a vertical transport path, with at least one forming device, which is intended to form the material web into a film tube with at least one longitudinal sealing unit intended to seal the film tube in a longitudinal direction, comprising at least one transverse sealing unit intended to divide the film tube into sections each forming one of the 3-edge sealed bags by forming transverse sealing seams , And with at least one trigger device, which has a cyclically moved first transport member and at least one further transport member for transporting the film tube in a continuous transport movement has been proposed.

Disclosure of the invention

The invention is based on a device for forming at least one web of 3-edge-sealed bags, in particular stick-packs, of at least one material web, along a vertical transport path, with at least one forming device which is provided for turning the material web into a film tube with at least one longitudinal sealing unit intended to seal the film tube in a longitudinal direction, with at least one transverse sealing unit intended to divide the film tube into sections by forming transverse sealing seams, each of which comprises Form edge seal bag, and with at least one trigger device, which has a cyclically moved first transport member and at least one further transport member for transporting the film tube in a continuous transport movement.

It is proposed that the further transport member is intended to transmit the transport movement to the film tube at least during a return movement of the first transport member opposite the transport movement. In this context, a "3-edge sealed bag" is to be understood, in particular, as meaning a bag which is formed by folding over a material web about its longitudinal axis and sealing it with a longitudinal sealing seam, so that a film tube is formed which has two transverse seams The closed bag thus has sealing seams on three of its edges, and there are also 3-edge sealed bags in which the transverse sealing seams have an angle deviating from a right angle with the longitudinal sealing seam The longitudinal seal can be formed by stacking and sealing foil edges with their insides to form a "finseal" that can be applied to the film tube. It is also possible that the longitudinal sealing seam is formed as a "lapseal" in which a simple overlap of the film edges is sealed, so that an inner side of the material web is sealed to an outer side of the material web The person skilled in the art will provide such and similar sealing seams depending on a desired appearance of the 3-edge-sealed bag In this context, a "stick-pack" is to be understood as meaning, in particular, a narrow and / or elongate 3-edge sealed bag. In particular, the stick pack may have a length in its longitudinal direction that corresponds to more than one-and-a-half times, preferably more than three times, more preferably more than five times its width measured in the direction of the transverse sealing seams. INS In particular, the stick-pack may have a width of less than 80mm, preferably less than 60mm, more preferably less than 40mm. Preferably, the length of the stick pack may be less than 300mm, more preferably less than 200mm. Preferably, the device is provided to a plurality of transversely to the transport movement arranged side by side

To make webs of 3-edge sealed bags. In this case, a wide web of material can be separated by parting devices parallel to the web and / or transport direction into sub-webs, and the resulting sub-webs can each form one of the webs of one of the webs to form the 3-edge sealed bags. It is also possible that the webs each independent webs are fed. It is possible that when forming the transverse sealing seams, the formed 3-edge sealed pouches are completely separated. Alternatively, the 3-edge sealed pouches at their transverse seams may remain joined to a subsequent and / or preceding 3-edge sealed pouch. Preferably, a perforation may be attached to the connection. The 3-

Edge-sealed bags can form so-called chain bag, which are separated by the consumer before use by tearing off.

In this context, a "vertical transport path" is to be understood as meaning, in particular, that the transport movement is oriented at least substantially in the direction of a weight force Preferably, the transport path with the direction of the weight force closes an angle of less than 30 °, particularly preferably less than Preferably, the 3-edge sealed bags are each filled by a filling device after the section of the film tube forming the respective 3-edge sealed bag has been longitudinally sealed and a first transverse sealing seam is fastened to an end of the section of the transport piece Subsequently, the 3-edge sealed bag is closed by forming the second transverse sealing seam. In this context, a "cyclically moving transport element" is to be understood as meaning in particular a transport element which has a sequence of movements which is repeated cyclically becomes. In particular, the transport member can be moved in a transporting movement and in a return movement following the transporting movement. The return stroke is preferably intended to move the transport member to a starting point at which a next transport can join movement. In this context, a "continuous" transport movement is to be understood as meaning, in particular, a transport movement which has a steady, standstill-free speed course while the apparatus forms a sequence of 3-edge sealed bags 3-edge sealed pouches, in particular to accelerations of less than 2.5 * 9.81 m / s ² , more preferably less than 1 * 9,81 m / s ² , accelerations occurring during the formation of the 3-edge sealed pouches The device can have a particularly high performance, in particular the device can be provided for the purpose of forming narrow and / or oblong transporting devices. Edge sealed bags, such as stick-packs, for continuous transport transfer to the film tube. The continuous transport movement may further include a start-up and a deceleration phase, while the film tube is accelerated from a standstill during a start-up and / or a machine stop or braked to a standstill. If the device is provided for forming a plurality of webs of 3-edge sealed bags, each of the webs can have its own removal device with a cyclically moved first transport member and at least one further transport member for transporting the respective film tube. It may also be possible that the extraction device and / or the first transport members and / or the further transport members of the webs are integrally formed or are part of a common assembly and / or driven together. It can be ensured that the drawers of the webs are moved synchronously. Components and / or drives can be saved.

As a result of the configuration of the device according to the invention, it can be advantageously achieved that the continuous transport movement is transferred further to the film tube during the return stroke movement of the first transport element. It can be avoided that the transport movement comes to a standstill during the return stroke movement of the first transport member and / or acceleration jumps occur. Preferably, the further transport member is in a direction perpendicular to the web direction and perpendicular to a travel henrichtung arranged in front of or behind the film tube. The device can build very narrow in the row direction.

It is proposed that the first transport member is formed by transverse sealing jaws of the transverse sealing unit. Under "cross sealing jaws" are in this

Associated in particular sealing jaws are understood to be moved to produce a transverse seal seam from opposite sides against a film tube and generate a transverse seal seam under the action of pressure and / or heat on the film tube. It is also possible that the transverse sealing seam is produced with a different active principle and / or the generation is assisted by another active principle, in particular by ultrasonic sealing, inductive sealing, laser sealing. The film tube may have special sealing layers that at least assist in creating a sealed seam, such as cold-sealing layers, which bond under pressure to form a sealed seam. The person skilled in the art will select a suitable technology here due to the packaging task. The transverse sealing jaws may further comprise separating and / or crushing knives, which at least partially separate the 3-edge sealing bag forming portions of the film tube. The separation is preferably transverse to the longitudinal direction and / or web direction, in the longitudinal direction and / or web direction in the middle of the transverse seam. The transverse sealing unit and / or the transverse sealing jaws of the transverse sealing unit are preferably drivable in the longitudinal direction with at least one movement component. The transverse sealing jaws can be mounted to rotate about an axis perpendicular to the longitudinal direction, so that the longitudinal direction forms a tangent to the circular path along which sealing surfaces of the transverse sealing jaws move.

Preferably, the transverse sealing jaws are mounted linearly displaceable in the direction of the longitudinal direction. It is also possible that the transverse sealing jaws perform a combination of rotations and / or linear movements. Preferably, the transverse sealing jaws are moved with the film tube in the longitudinal and / or web direction. While the transverse sealing unit generates the transverse sealing seam, the transverse sealing unit and / or the transverse sealing jaws of the transverse sealing unit can be moved in the web direction with the transporting movement and transmit the transporting movement to the film tube by means of the sealing pressure. A separate from the transverse sealing unit formed first transport organ can be omitted. It can be saved components. The device can be very compact. A positive and / or frictional connection between the transverse sealing jaws and the film tube can be particularly high due to a sealing pressure exerted by the transverse sealing jaws on the film tube. The transverse sealing unit can transmit the transport movement to the film tube particularly securely. An acceleration of the transport movement can be transmitted particularly securely to the film tube. In particular, in the event of high accelerations and / or during the startup and / or deceleration phase, slippage and / or slippage between the film tube and the transport member can be avoided. Deviating bag lengths and / or indexing errors of the film web resulting from a deviation of a

Target transport movement resulting from an actual feed of the film web can be avoided. It is also possible that the first transport member is formed by a clamping unit formed separately from the transverse sealing unit with separating knives. The clamping unit is preferably arranged in the direction of the transport movement a bag length after the transverse sealing unit. The arranged after the transverse sealing unit clamping unit can advantageously ensure by a force exerted on the film tube tensile force in the direction of transport movement, that the film tube in the region of the transverse sealing unit is wrinkle-free. A quality of the formed transverse sealing seams can be particularly high.

It is further proposed that the further transport member is formed by a cyclically moving organ. The organ can grip the film tube in particular by a frictional connection. The further transport member can exert further functions, for example the further transport member can be designed as an air ejector which reduces an air volume in the 3-edge sealed bag to be formed before the formation of the second transverse seam of the 3-edge sealed bag. This can be done by the further transport member of preferably two sides exerts a pressure on the 3-edge sealed bag. A separate from the other transport organ trained Luftauspresser can be omitted. The further transport member may be part of the longitudinal sealing unit, in particular a Längsheizzange. In this context, a "longitudinal heating tongs" is to be understood as meaning, in particular, a cyclically moved element which is intended to seal a film tube in the longitudinal direction The longitudinal heating tongs have two longitudinally oriented, elongate members Sealing jaws, which are pressed from two opposite sides against each other with their innersides edges of the film tube, so that the film tube is sealed under the action of pressure and / or heat in the longitudinal direction. The Längsheizzange is moved during the sealing process as the transverse sealing jaws with the transport movement and transmits the

Transport movement on the film tube. The further transport member and the Längsheizzange can be formed by the same components. The device can be particularly simple. In a further embodiment of the invention, it is proposed that the further

Transport organ is formed by a on a contact surface with the film tube in the direction of the transport movement circulating organ. Preferably, the orbiting member per web is formed by a single circumferential belt. The further transport element can have a particularly small installation space measured transversely to the web direction. The device can in one

Row direction transverse to the web direction have a particularly large number of webs at a small width transverse to the web direction. The device can form particularly narrow 3-edge sealed bags. The circulating member may in particular be formed by one or more circulating belts or rollers. A "contact surface" with the film tube is to be understood in each case as the surface of the further transport element which is in contact with the film tube at the respective moment and / or transmits the transport movement to the film tube. or can be transmitted continuously, Preferably, the rotating organ of sealing rolls of the

Longitudinal sealing unit are formed. Preferably, at least one drive unit is provided to drive the sealing rollers at a circumferential speed corresponding to the continuous transport movement. Sealing rolls are used, in particular, in continuous longitudinal sealing units which seal the film tube in the longitudinal direction by pressing at least one sealing roll against edges of the film tube resting on one another with their inner sides, so that the film tube is sealed in the longitudinal direction under the action of pressure and / or heat. On an opposite side of the sealing roller of the edges may preferably be mounted an intermediate plate which exerts a counter-pressure. It may also be possible that the Sealing roller presses the edges of the film web directly against a filling tube to which the film tube is formed. The intermediate plate and / or the filling tube preferably has a lower coefficient of friction with the film tube than the sealing roller, so that a frictional force resulting from sliding friction between the intermediate plate and the film tube in the direction of the transport movement is less than a maximum by static friction between the sealing roller and the film web transferable force in the direction of the transport movement. The sealing roller may be heated to produce the longitudinal sealing seam. Likewise, a heating unit, in particular a heat tunnel, can be arranged in the direction of the transport movement in front of the sealing roller. The heating unit can be the edges of the

Heat the film tube until it forms the longitudinal sealing seam by the sealing pressure exerted by the sealing roller. The longitudinal sealing seam can likewise be designed as a lapseal, in which the sealing roll exerts a sealing pressure against an overlap of the edges of the material web and thus produces the longitudinal sealing seam by sealing the outside with the inside of the material web. The further transport member and the longitudinal sealing unit can be formed by the same components. The device can be particularly simple. The device can be particularly compact. It is further proposed that the further transport member is provided to be acted upon for transmitting the transport movement with a vacuum. Preferably, a contact surface of the organ, which comes to grip with the film tube in contact, be subjected to a vacuum. A "vacuum" is to be understood as meaning a gas, in particular air, with a lower pressure than an ambient pressure.The organ may have openings on its active surface, which are subjected to the vacuum.An adhesion between the film tube and the organ may be improved The vacuum can preferably be switched on and / or off With a cyclically moved transport element, the vacuum at the end of a transport cycle of the further transport element is preferably switched off An influence of the film tube by a return stroke of the further transport element can be avoided A vacuum is applied only in the area of the contact surface, and the further transport element can transmit the transport movement to the film tube with particular safety. It is further proposed that an effective range of the further transport member in the direction of the transport movement is always arranged in front of the first transport member. In this context, an "effective range" should be understood as meaning, in particular, a region in which the further transport member makes contact with the film tube and transmits the transport movement to the film tube Partially or completely, the collision of the further transport member with the first transport organ can be avoided. <br/><br/> The device can be made narrow transversely to the web direction.

It is further proposed that the first transport member and the further transport member are provided to transmit the transport movement at least temporarily simultaneously. In particular, the further transport member can already transmit the transport movement in a time window before the first transport member begins with the return stroke. The first transport member can transmit the transport movement already in a time window before a cyclically moving further transport member begins with the return stroke. Preferably, the movements of the first transport member and the further transport member, at least while they simultaneously transmit the transport movement, synchronously. In particular, a control unit may be provided to synchronize the movements of the first transport member and the further transport member. Preferably, the time window, during which the first and the further transport member transmit the transport movement simultaneously, amount to at least 10 ms, preferably at least 20 ms. Preferably, the time window can be at least 5%, preferably at least 10%, of the period of a transport cycle comprising the transport movement and the return stroke movement of the transport member. A transition of the transmission of the transport movement by the first transport member and the further transport member can be made very uniform. The transmission of the transport movement on the film tube can be done without interruption.

It is proposed that the first transport element is provided for transport movement at least during an acceleration of the film hose to transfer. In particular, the first transport member may be provided to transmit the transport movement during a start-up phase. In particular, a first transport element designed as a transverse sealing unit can transmit particularly high forces in the direction of the transport movement to the film tube due to the high sealing pressure which the transverse sealing unit exerts on the film tube. In particular, the first transport member can transmit greater forces in the direction of the transport movement to the film tube as circulating transport members, in particular rotating transport members with frictional engagement, such as belts or rollers. The first transport organ can also transmit higher forces than a further cyclic transport element, in particular if the first transport organ is formed by a transverse sealing unit with high sealing pressure. The transmission of the transport movement during the acceleration of the film tube can be particularly reliable. A use of several further transport organs, in particular on the film tube of opposing further transport organs, can be avoided. The device may be particularly compact and / or have a particularly narrow installation space transversely to the web direction. The device can have a particularly large number of webs in a row direction transverse to the web direction at a small width transversely to the web direction.

It is further proposed that the molding device has a recess which is provided to at least partially accommodate the further transport member. In particular, the recess can be provided to partially accommodate a cyclically moved further transport member depending on its position along the transport path. The device can build very short in the transport direction. Collisions of the further transport member with the molding apparatus can be avoided.

Furthermore, a packaging machine with a device having the features described is proposed. The packaging machine can be designed in particular as a vertical 3-edge sealed bag machine. The packaging machine can have the stated advantages.

Further, a method for the production of 3-edge-sealed bags, in particular stick-packs, proposed in which at least one web with too at least one forming device is formed into a film tube, the film tube is sealed with at least one longitudinal sealing unit in the longitudinal direction, the film tube is divided with at least one transverse sealing unit by forming transverse sealing seams into sections, each forming one of the 3-edge sealed bag, and wherein the film tube is transported in a continuous transport movement by means of a take-off device with a cyclically moving first transport member and at least one further transport member, wherein the transport movement is transmitted at least during a return stroke of the first transport member by the further transport member on the film tube.

The device according to the invention should not be limited to the application and embodiment described above. In particular, in order to fulfill a mode of operation described herein, the device according to the invention can have a number deviating from a number of individual organs, components and units mentioned herein.

drawing

Further advantages emerge from the following description of the drawing. In the drawing, four embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Show it:

1 is a symbolic representation of a packaging machine with a device according to the invention in a first embodiment,

2 shows a symbolic representation of a material flow in the packaging machine,

3 is a schematic diagram of the device of the first embodiment, 4 is a schematic diagram of a device according to the invention in a second embodiment,

Fig. 5 is a schematic diagram of a device according to the invention in a third embodiment and

6 is a schematic diagram of a device according to the invention in a fourth embodiment,

Description of the embodiments

Figure 1 shows a packaging machine 56a, which is designed as a vertical, 15-lane stick-pack machine, with a device 10a according to the invention in a first embodiment. The apparatus 10a is for forming fifteen webs 12a of 3-edge sealed bags 14a, in this case stick-packs, of fifteen material webs 16a along a vertical transport path 18a (Figure 2).

The device 10a has forming devices 20a, which are intended to form the material webs 16a of each of the webs 12a into a film tube 22a in each case. The forming devices 20a are each formed by a forming shoulder about which the material web 16a is formed into the film tube 22a. The shaping device 20a has a central bore in a longitudinal direction 26a through which a filling tube 58a of a filling device 60a is guided (FIG. 3). The longitudinal direction 26a is oriented in the direction of a weight force, so that contents can fall due to its weight by the filling tube 58a. Furthermore, the device 10a has longitudinal sealing units 24a, which are intended to seal the film tubes 22a in the longitudinal direction 26a in each case.

The device 10a further comprises a transverse sealing unit 28a, which is provided to divide the film tubes 22a into sections 32a, each forming a 3-edge sealed bag 14a, by forming transverse sealing seams 30a. In the example shown, the transverse sealing unit 28a extends across all the webs 12a and simultaneously forms the transverse sealing seams 30a on the film tubes 22a of all the webs 12a. It is also possible that the webs 12a each independently executed, preferably synchronously driven transverse seal or that a plurality of transverse sealing units are arranged side by side in a row direction 70a and each form the transverse sealing seams 30a on a part of the tracks 12a. Especially with devices 10a that are wide in the row direction 70a, a plurality of transverse sealing units may be advantageous. The transverse sealing unit 28a respectively forms the transverse sealing seams 30a of a 3-edge

Sealed bag 14a at one oriented in the direction of a transport movement 36a end and the transverse sealing seams 30a at an opposite to the direction of the transport movement 36a oriented end of this 3-edge sealed bag 14a in the direction of the transport movement 36a adjacent 3-edge sealed bag 14a. To form the transverse sealing seams 30a, oppositely disposed transverse sealing jaws 44a are pressed against the film tube 22a, so that it is sealed under the action of heat and pressure. Furthermore, the transverse sealing jaws 44a have separating knives that separate the film tube 22a during the forming of the transverse sealing seams 30a in a region between the transverse sealing seam 30a of the first in the direction of the transporting movement 36a and the transverse sealing seam 30a of the 3-edge sealing bag 14a adjacent in the direction of the transporting movement 36a and so divided into the 3-edge sealed bag 14a forming portions 32a. It is also possible for the 3-edge sealed bags 14a to remain connected as so-called "chain bags." In this case, the transverse sealing unit 28a preferably applies a perforation and / or weakening line between the transverse sealing seams 30a of successive 3-edge sealed bags 14a. The filling device 60a fills the 3-edge sealed bags 14a respectively by the still open end oriented opposite to the direction of the transporting movement 36a, once the transverse sealing unit 28a has the transverse sealing seam 30a at the front end in the direction of the transporting movement 36a, and the longitudinal sealing unit 24a has closed the 3-edge sealed bag 14a by forming a longitudinal seam 68a in the longitudinal direction 26a

Transport the film tubes 22a in the continuous transport movement 36a, a first moving transport member 38a and at least one further transport member 40a. The further transport member 40a is provided to the transport movement 36a at least during one of the transport movement 36a opposite return stroke 42a of the first transport member 38a to transfer to the film tube 22a.

The fifteen material webs 16a are formed from a material web 62a which is unrolled from a material roll 64a and separated in the longitudinal direction 26a by fourteen separating elements 66a (FIG. 2) into the fifteen material webs 16a and transported in the direction of the forming devices 20a of the fifteen webs 12a. The respective first transport member 38a of the draw-off devices 34a is formed by the transverse sealing jaws 44a of the transverse sealing unit 28a. The two transverse sealing jaws 44a extend in the row direction 70a transversely to the longitudinal direction 26a along all tracks 12a. Thus, the first transport members 38a of the draw-off devices 34a are in this case formed integrally with the two transverse sealing seams 30a of all webs 12a forming transverse sealing jaws 44a of the transverse sealing unit 28a. The further transporting members 40a are each formed by a cyclically moving member 46a, which is acted upon by a vacuum on a contact surface 48a and designed as a gripper 72a, by means of which the respective film tube 22a in an action region 52a on one side of the film tube 22a facing away from the longitudinal seam 68a the vacuum for transmitting the transport movement 36a engages. The vacuum is formed by not shown here

Openings of the gripper 72a are acted upon with respect to an ambient pressure reduced air pressure. A measure of the pressure reduction can be advantageously adjustable, in particular as a function of a speed of the transport movement 36a to be transmitted. In the direction of the transport movement 36a, the effective region 52a of the further transporting members 40a is always arranged in front of the first transporting members 38a, that is to say the transverse sealing jaws 44a, in order to avoid collisions. The further transport members 40a are on a in the row direction 70a along all tracks 12a extending, by a drive unit 86a in the transport movement 36a and in a return stroke 76a against the transport movement 36a driven carrier

74a, which thus moves all transport members 40a together in the transporting movement 36a and in the return stroke movement 76a against the transporting movement 36a. The further transporting members 40a are subjected to the vacuum during the movement in the direction of the transporting movement 36a. During the return stroke movement 76a, counter to the transport movement 36a, the vacuum is applied so that the transport members 40a can slide along the film tubes 22a without transferring the return stroke 76a to the film tubes 22a. The first transporting member 38a and the further conveying member 40a temporarily transmit the transporting movement 36a simultaneously in a time window after the first transporting members 38a have started to transfer the transporting movement 36a until the return stroke movement 76a of the further transporting members 40a begins. The transporting members 38a also begin the return stroke movement 42a only shortly after the further transporting members 40a have again begun to transfer the transporting movement 36a. The movements of the first transport members 38a and the further transport members 40a are synchronous. A control unit 90a is provided to synchronize the movements of the first transport members 38a and the further transport members 40a. An interruption of the transmission of the transport movement 36a is avoided. Further, the molding devices 20a each have a recess 54a to partially receive the respective further transport member 40a when it moves in the return stroke 76a in the direction of an upper end position of the transport member 40a. An overall length of the device 10a in the longitudinal direction 26a can thus be reduced and / or a stroke of the transport members 40a in and against the transport movement 36a can be extended.

The device serves to carry out a method for producing 3-edge sealing bags 14a, in this case stick-packs, wherein the film tubes 22a are formed from the material webs 16a with the forming devices 20a, the film tubes 22a with longitudinal sealing units 24a in the longitudinal direction 26a sealing the film tubes 22a with a transverse sealing unit 28a by forming transverse sealing seams 30a into sections 32a, each forming one of the 3-edge sealed bags 14a, and the film tubes 22a in a continuous transporting movement 36a, respectively by means of withdrawal devices 34a with a cyclic moved first transport member 38a and at least one further transport member 40a, wherein the transport movement 36a is transferred at least during the return stroke 42a of the first transport member 38a through the further transport member 40a on the film tubes 22a. FIGS. 4 to 6 show three further exemplary embodiments of the invention. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, with reference in principle also to the drawings and / or the description of the other exemplary embodiments, in particular those relating to identically named components, in particular with regard to components having the same reference symbols Figures 1 to 3, can be referenced. To distinguish the embodiments of the letter a is the reference numerals of the embodiment in the figures 1 to 3 adjusted. In the exemplary embodiments of FIGS. 4 to 6, the letter a is replaced by the letters b, c or d.

FIG. 4 shows a schematic illustration of a web 12b of a device 10b for forming 3-edge sealed bags 14b along a vertical transport path 18b with a take-off device 34b in a second exemplary embodiment. The device 10b of the second embodiment is different from the first embodiment

Device 10a of the first embodiment in particular in that a further transport member 40b is formed in each case by a cyclically moving member 46b designed as a heating tongs 82b of a longitudinal sealing unit 24b. The heating tongs 82b, which are mounted by a drive unit 86b on a carrier 74b which can be driven in and against a transport movement 36b, each have two oppositely disposed heating jaws, not shown here. For each web 12b, a web of material 16b is turned into a film tube 22b about a forming device 20b extending in the longitudinal direction 26b and sealed to the film edges lying on its inner sides by the heating tongs 82b with a longitudinal seam 68b. For this purpose, the heating tongs 82b, with their heating jaws, grasp a section of the film edges of the film tube 22b in an active region 52b, press them against one another and thus seal them under the action of pressure and heat. During the wringing process, the heating tongs 82b are moved with the transporting movement 36b and transmit the transporting movement 36b to the film tube 22b. Subsequently, the

Heating tongs 82b open and moved in a return movement 76b opposite the transport movement 36b back to an initial position, where it is closed again and sealed a next portion of the longitudinal seam 68b, while it is moved with the transport movement 36b. A first transport member 38b of the discharge device 34b is as in the first Embodiment of transverse sealing jaws 44b of a transverse sealing unit 28b for forming transverse sealing seams 30b formed. A control unit 90b is provided to synchronize the movements of the first transport member 38b respectively formed by the transverse sealing jaws 44b and the further conveying member 40b respectively formed by the heating tools 82b. The transverse sealing unit 28b also divides the film tube 22b into sections 32b by forming transverse sealing seams 30b. The first transport member 38b and the further transport member 40b transmit the transporting movement 36b alternately. As in the first embodiment, the two transport members 38b, 40b transmit simultaneously in a time window, before they carry out their respective return stroke movement 42b, 76b, in order to avoid an interruption in the transmission of the transporting movement 36b. The heating tongs 82b can transmit the transporting movement 36b in a particularly reliable manner since, owing to a sealing pressure required for forming the longitudinal seam 68b, there is a high degree of frictional connection with the film tube 22b. Advantageously, the heating tongs 82b, while performing the return stroke movement 76b against the transporting movement 36b, can be moved away from the film tube 12b in a direction transverse to the transporting movement 36b. It can be avoided that the heating tongs 82b touch the film tube 12b during the return stroke movement 76b. If the heating tongs 82b return to their starting position at the end of the return stroke movement 76b, in this case the heating tongs 82b are again moved in the direction of the film tube 12b so that the heating tongs 82b can again grip a section of the foil edges with their heating jaws. FIG. 5 shows a schematic representation of a web 12c of a device 10c for the purpose of FIG

Forming 3-edge sealed bags 14c along a vertical transport path 18c with a take-off device 34c in a third embodiment. The device 10c of the third embodiment differs from the device 10a of the first embodiment, in particular in that a further transport member 40c from one to a contact surface 48c with a

Foil tube 22c in the direction of a transport movement 36c circulating member 50c is formed. For each web 12c, a web of material 16c is turned into a film tube 22c about a forming device 20c extending in the longitudinal direction 26c and sealed by a longitudinal sealing unit 24c in the longitudinal direction 26c. The circulating member 50c is in each case separated from one by a drive unit 86c driven circumferential belt 78c formed. Like the transport elements 40a of the first exemplary embodiment, the belts 78c are each arranged on a side of the film tubes 22c facing away from a longitudinal seam 68c and contact the film tubes 22c in respective active regions 52c. Transmission of the transporting motion 36c is performed continuously due to stiction between the belts 78c and the film tubes 22c. Furthermore, in a departure from the first exemplary embodiment, a clamping unit 84c with separating knives for separating the 3-edge sealed bags 14c is formed separately from a transverse sealing unit 28c having a transverse sealing jaw 44c. A first transporting device 38c is provided by the separating knife having clamping unit

84c, which is arranged in the direction of the transporting movement 36c in a bag length corresponding distance after the transverse sealing unit 28c. The transverse sealing unit 28c divides the film tube 22c into sections 32c, as in the first embodiment, by forming transverse sealing seams 30c, which are subsequently separated by the clamping unit 84c. The first transport organ

38c, as in the first embodiment, is cyclically moved in the direction of the transporting movement 36c and in an opposite return stroke movement 42c, and transmits the transporting movement 36c respectively while performing the movement in the direction of the transporting movement 36c. The first transport member 38c is provided to transfer the transporting movement 36c at least during acceleration of the film tube 22c. By means of a pressure exerted on the film tube 22c during a separation process of the clamping unit 84c, there is a frictional connection between the clamping unit 84c and the film tube 22c, which can transmit substantially higher forces in the direction of the transport movement 36c to the film tubes 22c than the further transport element 40c. Therefore, especially at a start-up of the device 10c, in which the film tube 22c is accelerated from standstill, the transport movement 36c is transmitted through the first transport member 38c. The further transport member 40c also transmits the transporting movement 36c supportive in this case. A control unit 90c of the device 10c is designed so that accelerations of the film tubes 22c, which exceed the possibilities of a force transmission in the direction of the transport movement 36c of the further transport members 40c, are executed only when the transport movement 36c is transmitted by the first transport member 38c. By the first in the direction of the transport movement 36 c after a transverse sealing unit 28 c arranged Transport member 38c, the film tube 22c during the transverse sealing in the region of the transverse sealing unit 28c on a tensile stress, whereby the transverse sealing seams 30c can be formed particularly wrinkle-free. FIG. 6 shows a schematic illustration of a web 12d of a device 10d for the purpose of FIG

Forming 3-edge sealed bags 14d along a vertical transport path 18d with a take-off device 34d in a fourth embodiment. The device 10d of the fourth embodiment differs from the device 10a of the first embodiment in particular in that a further transport member 40d is formed by an organ 50d formed by a respective sealing roller 80d of a longitudinal sealing unit 24d driven by a drive unit 86d. The longitudinal sealing unit 24d also has a heating tunnel 88d arranged in the direction of a transporting movement 36d in front of the sealing roller 80d, which is intended to preheat the film edges of a film tube 22d formed from a material web 16d with a forming device 20d to a sealing temperature. The sealing rollers 80d subsequently generate a longitudinal seam 68d oriented in a longitudinal direction 26d by exerting pressure and heat on the film edges. An intermediate plate 92d, which is arranged between the film tube 22d and the folded longitudinal seam 68d, supports the longitudinal seam 68d against the pressure exerted on the longitudinal seam 68d by the sealing rolls 80d. An effective region 52d of the sealing roll 80d is arranged in the direction of the transporting movement 36d in front of a first transporting element 38d. Due to a sealing pressure necessary for sealing, the sealing rollers 80d have a frictional connection with the longitudinal seam 68d of the film tube 22d at a contact surface 48d, so that the sealing rollers 80d can transmit the continuous transport movement 36d to the film tube 22d. The first transport member 38d is formed as in the first embodiment of transverse sealing jaws 44d of a transverse sealing unit 28d. The transverse sealing unit 28d also divides the film tube 22d into sections 32d by forming transverse sealing seams 30d. The first transporting member 38d is cyclically moved in the direction of the transporting movement 36d and in an opposite returning movement 42d, as in the first embodiment, and transmits the transporting movement 36d respectively while it exerts the movement in the direction of the transporting movement 36d. While the first transport element 38d and the further transport element 40d have the transport movement 36d in common transferred sam, particularly high accelerations in the direction of the transport movement can be transferred to the film tubes 22d 22d. The device 10d can be made more compact than the device 10a and / or 10b, since a further transport element embodied as a separate assembly can be dispensed with. The embodiment according to the device 10d is possible if the longitudinal sealing unit 24d has sealing rollers 80d or peripheral elements which can perform the task of the further transport members, such as a longitudinal sealing unit, which has circumferential sealing bands.

Claims

claims

Device for forming at least one web (12a-d) of 3-edge sealed bags (14a-d), in particular stick-packs, of at least one material web (16a-d) along a vertical transport path (18a-d) .

- With at least one forming device (20a-d), which is provided to the material web (16a-d) to form a film tube (22a-d),

- having at least one longitudinal sealing unit (24a-d), which is intended to seal the film tube (22a-d) in a longitudinal direction (26a-d),

with at least one transverse sealing unit (28a-d), which is intended to divide the film tube (22a-d) into sections (32a-d) by forming transverse sealing seams (30a-d), each of which has one of the 3 edge zones. Seal bags (14a-d) form, and with at least one take-off device (34a-d) for transporting the film tube (22a-d) in a continuous transport movement (36a-d) a cyclically moving first transport member (38a-d) and at least one further transport member (40a-d), characterized in that

the further transport member (40a-d) is provided for transporting the transport movement (36a-d) onto the film tube (22a-d) at least during a return movement (42a-d) of the first transport member (38a-d) opposite the transport movement (36a-d). d) to transfer.

2. Device according to claim 1, characterized in that the first transport member (38a-b, d) of transverse sealing jaws (44a-b, d) of the transverse sealing unit (28a-b, d) is formed.

3. Apparatus according to claim 1 or 2, characterized in that the further transport member (40a-b) by a cyclically moving member (46a b) is formed. Device at least according to claim 1 or 2, characterized in that the further transport member (40c-d) of a on a contact surface (48c-d) with the film tube (22c-d) in the direction of the transport movement (36c-d) circulating member ( 50c-d) is formed.

Device according to one of the preceding claims, characterized in that the further transport member (40a) is provided to be applied to transmit the transport movement (36a) with a vacuum.

Device according to one of the preceding claims, characterized in that an active region (52a-d) of the further transport member (40a-d) in the direction of the transport movement (36a-d) always in front of the first transport member (38a-d) is arranged.

Device according to one of the preceding claims, characterized in that the first transport member (38a-d) and the further transport member (40a-d) are provided to transmit the transport movement (36a-d) at least temporarily simultaneously.

Device according to one of the preceding claims, characterized in that the first transport member (38a-d) is provided to transmit the transport movement (36a-d) at least during acceleration of the film tube (22a-d).

Device according to one of the preceding claims, characterized in that the molding device (20a) has a recess (54a) which is provided to at least partially receive the further transport member (40a).

Packaging machine (56a-d) with a device (10a-d) according to one of the preceding claims. Method for producing 3-edge sealed bags (14a-d), in particular stick-packs, wherein at least one material web (16a-d) having at least one forming device (20a-d) is formed into a film tube (22a-d) which Film tube (22a-d) with at least one longitudinal sealing unit (24a-d) in the longitudinal direction (26a-d) is sealed, the film tube (22a-d) with at least one transverse sealing unit (28a-d) by forming transverse sealing seams (30a-d) is subdivided into sections (32a-d) which each form one of the 3-edge sealed bags (14a-d), and wherein the film tube (22a-d) is conveyed in a continuous transporting movement (36a-d) by means of a take-off device (34a-d). d) is transported with a cyclically moving first transport member (38a-d) and at least one further transport member (40a-d), wherein the transport movement (36a-d) at least during a return stroke (42a-d) of the first transport member (38a-d ) by the further transport member (40a-d) on the film tube (22a -d) is transmitted.