Vertical tubular bag machine for packing items
In order to allow stacks (137) of groups of items (123) placed one on top of the other, in particular comprising coffee pods, to be packed in tubular bags (16) by means of a vertical tubular bag machine (1), it is proposed either to adapt a filling pipe (6) to the horizontal dimensions of the groups of items (23) or to provide it with an insert (125) in order to stabilize the stack during its falling movement in the filling pipe (6). The insert (125) is similarly adapted to the geometry of the items in order to stabilize them during their fall in the filling pipe (6).
The invention relates to the packaging sector and, in that sector, to a vertical tubular bag machine with a web of film unwound from a supply roll. A machine of this type has a shaping shoulder for shaping the web of film into a film tube and a vertically aligned filling pipe, which receives the film tube and through which it is possible to fill the film tube. A filling station for items to be packed, above the filling pipe, serves for this filling operation. A film takeoff, acting against the film tube, and consequently against the filling pipe, is provided for further transportation of the web of film and the film tube. A longitudinal sealing device serves for welding the film tube by means of a longitudinal seam, aligned in the transporting direction, and a transverse sealing device with two welding jaws, which can be moved toward each other and weld the film tube transversely, serves for producing top seams and bottom seams of tubular bags. The completed tubular bags are severed from the film tube by means of a cutting device.
Vertical tubular bag machines of this type are sufficiently known. They generally serve for packing flowable or pourable products, such as granules for example. In principle, products in piece form can also be packed.
The known vertical tubular bag machines have the disadvantage that they are not very suitable for packing items which form a group of items, in the form of vertical stacks to be introduced into tubular bags, since the items turn during their free fall in the filling pipe, and consequently land in an uncontrollable manner in the welded end of the film tube. For reasons of simplification, a group of items is intended for the purposes of this application to mean either a single, horizontally aligned item, such as for example a coffee pod, or a group of two or more items arranged directly next to one another in a horizontal direction (such as coffee pods for example).
Because of this problem with falling, horizontal groups of items (single, double, triple group, . . . ) cannot be packed by means of vertical tubular bag machines. Instead, these groups are stacked into previously produced empty bags that are able to stand, which is comparatively laborious, and consequently expensive, since a vertical tubular bag machine has to be used in any case for producing the empty bags.
The invention is based on the object of designing a vertical tubular bag machine in such a way that it can be used for packing groups of items that are intended to form a stack in the tubular bag.
The object is achieved as specified in the defining part of claim 1. According to this, the filling station is intended for delivering in each case a vertically stacked group of items formed by horizontally aligned flat, preferably disk-shaped, items, and at the filling pipe an adaptation is provided with respect to the horizontal dimensions of the group of items.
The proposed tubular bag machine has the advantage that it is suitable for packing a vertical stack of items or groups of items in tubular bags. If only one item forms a group of items, all the items are stacked one on top of the other. If two or more items form a horizontally aligned group of items, two or more of such stacks are filled next to one another into a tubular bag. In this case, it is immaterial whether the groups of items are introduced into the filling station individually and one after the other or as a stack. A stack reliably falls through the filling pipe, since it is stabilized there, until it lands in the lower end of the film tube. The adaptation at the filling pipe is provided for single item stacks or a number of stacks which fall next to one another through the filling pipe, or for a single item discharge or a single discharge of groups of items.
Further, advantageous refinements of the proposed tubular bag machine are described in claims 2 to 18.
If, according to claim 2, the filling pipe is adapted with respect to its cross section to the horizontal dimensions of the group of items, and if guides which precisely delimit the groups of items falling in the filling pipe are provided in the filling pipe as fall stabilizers, the groups of items are in this way brought through the filling pipe in a reliable way, without tilting to such an extent as to produce an unstable stack.
If, according to claim 10, an insert which is adapted to the geometry of the items is provided in the filling pipe in order to stabilize said items while they are falling in the filling pipe, this advantage is likewise achieved. Moreover, conventional filling pipes of a rectangular cross section (with or without rounded corners), a round form or partly round and straight form in their cross section may be used in order to allow stacks to be formed by means of this insert.
Very good guidance of the stack through the filling pipe is achieved if, according to claim 3, the items are round and in a corner of the filling pipe there is respectively provided a guide in the form of a bevel closing off the corner. In this case, the exact configuration of the bevel can be adapted to the dimensions of the item. The guide is suitable for single, double and triple stacks (group of items with one item or two or three items).
Correct falling of a stack while retaining a compact stack height is achieved in particular if, according to claim 4, in each case two overlapping items are provided next to one another in a horizontal direction in the stack, and inwardly tapering guiding points extending between the two items on opposite sides of the filling pipe are provided as a guide. A stack of this type is suitable in particular for coffee pods. It is a stack of two with edges of the items of the two single stacks forming this stack of two in each case engaging alternately in one another (single items simply stacked one on top of the other).
A tubular bag may be provided with a shielding gas if one guide delimits a gas feed and another guide delimits a vent for the lower end of the film tube (claim 5). In this way it is possible for a tubular bag that is to be produced to be flowed through by means of a shielding gasp so that the stack to be packed is provided with a special, for example oxygen-free, gas atmosphere.
If, according to claim 6, the width and the depth of the filling pipe are made to match the width and the depth of a group of items, and if the group of items is placed above the filling pipe in such a way that a first equal spacing in the direction of the width and similarly a second equal spacing in the direction of the depth of the filling pipe is provided on opposite sides of the group of items, in each case between the outer edge of the group of items and the inner surface of the filling pipe, and if these spacings do not all have the value zero, the filling pipe having a cross section that is symmetrical to axes of symmetry of the group of items, and two pipe segments of the filling pipe that are opposite and parallel to each other, extend in the transporting direction and on which the film takeoffs act are provided, then the horizontally aligned flat items remain relatively reliably in this alignment even during the free fall. In this way there is initially an equal spacing between the group of items and the filling pipe on each opposite side (in a horizontal direction), which has the effect that no tilting moments act on a group of items at the beginning of the free fall.
A favorable horizontal alignment of the groups of items is maintained during their free fall in the filling pipe if, by analogy with claim 7, the spacings have a value between 0 and 10 mm. Then the air respectively forced past the groups of items on opposite sides is present in equal amounts in a stabilizing way, or scarcely present in the same way. It also satisfies the homogeneity of the air flow in the filling pipe if, in the case of round items, in particular round coffee pods, according to claim 8, the walls of the filling pipe that lie opposite one another and are not intended for the film takeoffs to act on have an outwardly facing arc, an outwardly directed bend or at least two outwardly directed bends. In this case, the pipe segments may extend entirely over opposite walls (claim 9), in order to offer the film takeoffs a large area of engagement, which is of advantage for correct film running.
If the filling pipe has only side walls, which are straight or curved, and which are optionally connected to one another by means of rounded portions (claim 11), conventional filling pipes, which achieve good film running, can be used in a low-cost way. Irrespective of the form of the filling pipe, the device may be provided with an exchange mechanism in order to use the filling pipe optionally for bulk material or for stack packing (claim 18). Or one insert may be exchanged for an insert of another geometry, in order to pack items of other geometries or larger or smaller groups of items.
A filling pipe may have a special form that is adapted to the geometry of the items and nevertheless have side walls that are straight or curved in a simple way, for example on the basis of a predetermined, single radius, if on such a filling pipe, having longitudinal bends for example, there is provided at least one attachment which, together with a straight portion of the filling pipe, forms a straight side wall (claim 12). Or a bent attachment forms with a bent side wall of the filling pipe an altogether uniformly bent outer wall, i.e. outermost wall, for the filling pipe. In this way, specially configured filling pipes can be brought into an outer form that is favorable for film running.
A group of items falls through the filling pipe along a falling line. If, according to claim 13, the insert thereby delimits a channel which is adjacent a falling line of the items and open toward the items, so it serves for receiving air that is displaced by the falling items. The falling characteristics become more reliable, so that the packing rate can be increased. At the same time, this channel can also be used for holding the items during their fall. This takes place in that, according to claim 14, the items have a peripheral edge, and the insert is dimensioned in such a way that the items fit into the insert only with the edge bent round, part of the edge protruding into the channel. A peripheral edge has the advantage here that, irrespective of their alignment or their rotational position, part of the edge of the items always reaches into the channel and in this way the items are guided in the latter.
More precise, reproducible falling times are also achieved if at least one venting channel is provided in the filling pipe for air that is displaced by the falling items to flow upward.
It is possible to use an insert for different geometries or dimensions of items if the insert has an adjusting device for delimiting the items (claim 16).
An additional filling channel in the filling pipe (claim 17) can be used in order to add, for example to a stack of coffee pods sliding through the insert, a supplement, for example a bag with descaling agent for a coffee machine that uses coffee pods for making coffee.
The invention is described in more detail below on the basis of figures representing exemplary embodiments, in which:
In the case of a vertical tubular bag machine 1 with a web of film 3 unwound from a supply roll 2, a shaping shoulder 4 serves for shaping the web of film 3 into a film tube 5 (
The filling pipe 6 is adapted with respect to its cross section to the horizontal dimensions of the group of items 23. Guides 37 which precisely delimit the groups of items 23 falling in the filling pipe 6 are provided in the filling pipe 6 as fall stabilizers (
The filling pipe b (
The walls 32 of the filling pipe 6 that lie opposite one another and are not intended for the film takeoffs 8 to act on have an outwardly directed bend 34 (
In each case two overlapping items 23 (
In the case of the exemplary embodiment of
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In each case two overlapping items 23 (
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- 1 tubular bag machine
- 2 supply roll
- 3 web of film
- 4 shaping shoulder
- 5 film tube
- 6 filling pipe
- 7 filling station
- 8 film takeoff
- 9 longitudinal sealing device
- 10 transporting direction
- 11 longitudinal seam
- 12 transverse sealing device
- 13 welding jaw
- 14 top seam
- 15 bottom seam
- 16 tubular bag
- 17 cutting device
- 18 item
- 19 width of the filling pipe 6
- 20 depth of the filling pipe 6
- 21 width of a group of items 23
- 22 depth of a group of items 23
- 23 group of items
- 24 outer edge
- 25 inner surface
- 26 spacing in direction of the width 19
- 27 spacing in direction of the depth 20
- 28,29 axis of symmetry
- 30,31 pipe segments
- 32 wall
- 34,35 bend
- 36 wall
- 37 guide
- 38 corner
- 39 bevel
- 40 guiding point
- 41 gas feed
- 42 vent
- 43,44 axis
- 125 insert
- 126 attachment
- 137 stack
- 139 venting channel
- 140 filling channel
- 141 supplement
- 142 adjusting device
- 143 fastening
- 144 channel adjacent falling line
- 145 straight side wall
- 146 curved side wall
- 147 rounded portion
- 148 straight portion
Claims
1. A vertical tubular bag machine (1) with a web of film (3) unwound from a supply roll (2), a shaping shoulder (4) for shaping the web of film (3) into a film tube (5), a vertically aligned filling pipe (6), which receives the film tube (5) and through which it is possible to fill the film tube (5), a filling station (7), above the filling pipe (6), a film takeoff (8), acting against the film tube (5), and consequently against the filling pipe (6), for further transportation of the web of film (3) and the film tube (5), a longitudinal sealing device (9) for welding the film tube (5) by means of a longitudinal seam (11), aligned in the transporting direction (10), a transverse sealing device (12) with two welding jaws (13), which can be moved toward each other and weld the film tube (5) transversely, for producing top seams (14) and bottom seams (15) of tubular bags (16) and also a cutting device (17) for severing the tubular bags (16) from the film tube (5), wherein the filling station (7) is intended for delivering in each case a vertically stacked group of items (23) formed by horizontally aligned flat, preferably disk-shaped, items (18), and wherein at the filling pipe (6) an adaptation is provided with respect to the horizontal dimensions of the group of items (23).
2. The tubular bag machine as claimed in claim 1, wherein the filling pipe (6) is adapted with respect to its cross section to the horizontal dimensions of the group of items (23), and wherein guides (37) which precisely delimit the groups of items (23) falling in the filling pipe (6) are provided in the filling pipe (6) as fall stabilizers.
3. The tubular bag machine as claimed in claim 2, wherein the items (23) are round and in a corner (38) of the filling pipe (6) there is respectively provided a guide (37) in the form of a bevel (39) closing off the corner (38).
4. The tubular bag machine as claimed in claim 2, wherein in each case two overlapping items (23) are provided next to one another in a horizontal direction in the stack, and wherein inwardly tapering guiding points (40) extending between the two items (23) on opposite sides of the filling pipe (6) are provided as a guide (37).
5. The tubular bag machine as claimed in claim 3, wherein one guide (37) delimits a gas feed (41) and another guide (37) delimits a vent (42) for the lower end of the film tube (6).
6. The tubular bag machine as claimed in claim 1, wherein the the width (19) and the depth (20) of the filling pipe (6) are made to match the width (21) and the depth (22) of a group of items (23) and the group of items (23) is placed above the filling pipe (6) in such a way that a first equal spacing (26) in the direction of the width (19) and similarly a second equal spacing (27) in the direction of the depth (20) of the filling pipe (6) is provided on opposite sides of the group of items (23), in each case between the outer edge (24) of the group of items (23) and the inner surface (25) of the filling pipe (6), wherein these spacings (26, 27) do not all have the value zero, wherein the filling pipe (6) has a cross section that is symmetrical to axes of symmetry (28, 29) of the group of items (23), and wherein two pipe segments (30, 31) of the filling pipe (6) that are opposite and parallel to each other, extend in the transporting direction (10) and on which the film takeoffs (8) act are provided.
7. The tubular bag machine as claimed in claim 6, wherein the spacings (26, 27) have a value between zero and 10 mm.
8. The tubular bag machine as claimed in claim 6, wherein walls (32) of the filling pipe (6) that lie opposite one another and are not intended for the film takeoffs (8) to act on have an outwardly facing arc, an outwardly directed bend (34) or at least two outwardly directed bends (34, 35).
9. The tubular bag machine as claimed in claim 8, wherein the pipe segments (30, 31) extend entirely over opposite walls (36).
10. The tubular bag machine as claimed in claim 1, wherein an insert (125) which is adapted to the geometry of the items (18) is provided in the filling pipe (6) in order to stabilize said items while they are falling in the filling pipe (6).
11. The tubular bag machine as claimed in claim 10, wherein the filling pipe (6) has only side walls, which are straight (145) or curved (146), and which are optionally connected to one another by means of rounded portions (147).
12. The tubular bag machine as claimed in claim 10, wherein on the filling pipe (6) there is provided at least one attachment (126) which, together with a straight portion (148) of the filling pipe (6), forms a straight side wall (145).
13. The tubular bag machine as claimed in claim 10, wherein the insert (125) delimits a channel (144) which is adjacent a falling line of the items (18) and open toward the items (18).
14. The tubular bag machine as claimed in claim 13, wherein the items (18) have a peripheral edge (24), wherein the insert (125) is dimensioned in such a way that the items (18) fit into the insert (125) only with the edge (24) bent round, and wherein part of the edge (24) protrudes into the channel (144).
15. The tubular bag machine as claimed in claim 10, wherein at least one venting channel (139) is provided in the filling pipe (6) for air that is displaced by the falling items (18) to flow upward.
16. The tubular bag machine as claimed in claim 10, wherein the insert (125) has an adjusting device (42) for delimiting the items (18).
17. The tubular bag machine as claimed in claim 10, wherein an additional filling channel is provided in the filling pipe (6).
18. The tubular bag machine as claimed in claim 10, wherein the insert (125) can optionally be inserted or exchanged.
Type: Application
Filed: Mar 29, 2005
Publication Date: Dec 8, 2005
Inventors: Gerhard Kuss (Wetzlar), Torsten Nicolai (Buseck), Walter Baur (Gruendau)
Application Number: 11/092,996