DE202013003142U1 - Device for producing at least one interrupted longitudinal seam in a material web - Google Patents

Abstract

Device (10, 10.4, 10.5, 10.6, 10.7, 10.8) for producing at least one interrupted longitudinal sealing seam (18) in a material web (12)
- With at least one lower (32, 32.4) and at least one upper sealing roller (30, 30.4, 30.6), between which the material web (12) can be passed,
- With a clamping device (42) by means of which the upper (30, 30.4, 30.6) and the lower sealing roller (32, 32.4) are pressed against each other,
- With a separating device (44, 44.4, 44.5, 44.6, 44.7, 44.8), by means of which the upper (30, 30.6) and / or the lower sealing roller (32.4) are cyclically apart against the pressure applied by the clamping device (42) pressure,
- characterized in that
- The separating device (44, 44.4, 44.5, 44.6, 44.7, 44.8) at least one drivable shaft (54, 54.6), via which the lower (32.4) and / or the upper sealing roller (30, 30.6) is cyclically movable.

Description

TECHNICAL AREA

The invention relates to a device by means of which one or more longitudinal sealing seams can be produced in a material web. Such longitudinal sealing seams are used, for example, in the production of flat bags, in order to close the flat bags on their longitudinal sides in the web running direction.

STATE OF THE ART

In the production of flat bags, a lower film web is usually first filled with the product to be packaged, for example a wound plaster or a therapeutic plaster. Subsequently, an upper film web is applied to the lower film web, so that the product to be packaged is positioned between the lower and the upper film web. The longitudinal sides of the resulting web are sealed with longitudinal sealing rolls by passing the web between an upper and a lower sealing roll. At least one of the two sealing rollers is heated to a certain temperature, which is dependent on the material of the film webs used. The two sealing rollers are pressed against each other via a clamping device, so that a continuous longitudinal sealing seam is formed in the material web.

In certain formats of the flat bag to be produced, it may be necessary to make an interrupted longitudinal seam to produce, for example, a peel tab. By means of such a peel tab, the flat bag produced can be easily opened and the packaged product can be removed from the material web. In order to produce such an interrupted longitudinal sealing seam, for example corresponding formate rolls can be used as sealing rolls. In this case, the sealing roller has a recess in a certain area, so that no longitudinal sealing seam can be produced in this area. Although the use of formate rolls as sealing rolls enables high web speeds, in the case of a format change of the material web, however, the individual sealing rolls must be replaced, which leads to considerable service lives. In addition, expensive format parts must be used as sealing rolls, which must be produced individually for each new format.

Alternatively, a pneumatic lifting of one of the two sealing rollers can take place in order to interrupt the longitudinal sealing seam. However, a pneumatic increase is only possible at low web speeds, since only small numbers of cycles can be realized by such a device.

PRESENTATION OF THE INVENTION

Based on this prior art, the present invention seeks to provide an improved apparatus for producing at least one interrupted longitudinal seam in a web, which does not require format parts and allows high cycle speeds, so that high web speeds can be achieved.

The device according to the invention is given by the features of the main claim 1. Useful developments of the invention are the subject of further claims appending to the main claim.

The device according to the invention for producing at least one interrupted longitudinal seam in a material web has at least one upper and at least one lower sealing roll, between which the material web is passed. The upper and lower sealing rolls are pressed together by a clamping device to produce a longitudinal sealing seam. It may be sufficient to heat only one of the two sealing rollers, wherein both the lower and the upper sealing roller can be heated. However, it would also be possible to heat both seal rolls, for example to produce higher web speeds. In order to interrupt the longitudinal sealing seam at a certain point, a separating device is provided, by means of which the upper and / or the lower sealing roller are cyclically pressed apart against the pressure applied by the clamping device. According to the invention, the separating device has at least one drivable shaft, via which the lower and / or the upper sealing roller can be moved cyclically.

The device according to the invention therefore makes do without format parts, which makes possible a simple and rapid adaptation of the device to different formats of the material web to be processed. Due to the drivable shaft, over which the lower and / or the upper sealing roller are moved in cycles, beyond high cycle rates and thus a high web speed are possible. The sealing rollers can be moved directly or indirectly by the drivable shaft.

In a preferred embodiment, the upper and / or the lower sealing roller can be rotatably mounted on a holding unit. This holding unit can be mounted pivotably about an axis of rotation, so that these indirectly or directly by the drivable shaft of the separator to the axis of rotation can be pivoted. Such an embodiment is structurally simple to implement and thus economical to manufacture.

The drivable shaft of the separating device can act directly on the holding unit. In this case, the holding unit could for example rest on the drivable shaft or be stored in any other way directly on the drivable shaft.

In a preferred embodiment, the holding unit can be moved indirectly by the drivable shaft. In this case, at least one ram displaceable in its longitudinal direction could be respectively mounted with its one end on the drivable shaft of the separating device and with its other end on the holding unit of the sealing roller.

The displaceable plunger can in particular be mounted against rotation on the drivable shaft. For this purpose, the plunger could be connected via a holding unit with an axle having at least two rollers. These rollers could as well as the one end of the plunger on the drivable shaft rollable rest. This can preclude that the plunger is rotated by the movement of the driven shaft about its longitudinal axis, which would lead to inaccuracies in the transmission of the movement of the plunger on the sealing rollers.

In a first embodiment, either the upper or lower sealing roller could be moved to effect an interruption of the longitudinal sealing seam. In this case, a plunger could either engage the upper sealing roller or the lower sealing roller to move them accordingly. If only one of the two sealing rollers is heated, in particular the heated sealing roller should be moved relative to the counter-sealing roller. Otherwise, a longitudinal sealing seam could possibly also be produced by the heat of the sealing roller still in contact with the material web, even without the second sealing roll, even if this section of the longitudinal sealing seam might not be completely impermeable.

In a second embodiment, both the upper and lower sealing rolls could be moved. The two sealing rollers would then move apart in opposite directions in this case. For this purpose, each of the sealing rollers have their own drivable shaft, via which the respective movement of the sealing roller takes place. However, the sealing rollers could also have a common driven shaft, so that by means of a single driven shaft both a movement of the upper and a movement of the lower sealing roller is possible simultaneously. For this purpose, a ram mounted on a drivable shaft could, on the one hand, be mounted on the holding unit of one sealing roller and, on the other hand, on the holding unit of the other sealing roller via an extension unit. The upper sealing roller could thus be pivoted upwards by the plunger, while the lower sealing roller could be pivoted downwards via a corresponding deflection unit by the plunger. In this case, the distance of the sealing rollers from the material web could be slightly lower than when lifting only one of the two sealing rollers, so that shorter Anhebewege the sealing rollers would incur, which would increase the cycle numbers.

As a rule, in the production of longitudinal sealing seams, two adjacent longitudinal sealing seams are produced simultaneously in order to simultaneously seal both longitudinal sides of a flat bag. The device according to the invention can therefore have two upper and two lower sealing rollers, which are arranged side by side with a predeterminable, in particular variable distance. In order to allow a later opening, for example, the produced flat bag, this flat bag should have a peel tab. This peel-tab can be formed continuously. In this case, both the right seal roll and the left seal roll (upper and / or lower) would have to be moved.

However, it would also be possible to move only the right or the left sealing roller. In this case, only one of the two sealing seams would be interrupted. The peel tab would then no longer be continuous, but the flat bag could still be opened easily and quickly via the one-sided peel tab. In this case, alternately a left and a right sealing roller could be moved in order to allow higher cycle numbers, so that both longitudinal sealing seams would be interrupted alternately. The produced flat bags would then alternately have a right peel open tab and a left open peel tab.

If the right sealing roll and the left sealing roll are to be moved, each of the sealing rolls can have its own drivable shaft. In an advantageous embodiment, both upper sealing rolls and / or both lower sealing rolls can be moved via a common drivable shaft. By using a common driven shaft, the cost of manufacturing the device can be reduced because the cost of a second shaft and a second drive can be saved.

The drivable shaft of the separating device may in particular be a camshaft and / or an eccentric shaft. Depending on the cross section of the shaft, an exact adjustment of the Abhebewegs can thus be made so that the smallest possible Abhebewege be enabled. Alternatively, the drivable shaft may also be formed as a curve.

The shaft of the separating device has its own drive, which may in particular be a servomotor. As a result, the rotational speed of the shaft is independent of the web running speed. The rotation speed of the shaft can thus be adjusted via a corresponding programming of the servomotor, so that the lift-off frequency and the lift-off duration can be set individually and precisely in order to adapt the device to different formats of the flat bags to be produced.

Further advantages and features of the invention can be found in the claims further specified features and the following embodiments.

BRIEF DESCRIPTION OF THE DRAWING

The invention will be described and explained in more detail below with reference to the embodiments illustrated in the drawings. Show it:

1 a schematic plan view of a material web to be processed in its passage through a device according to the invention for producing longitudinal sealing seams and by an apparatus for producing transverse sealing seams,

2 1 is a schematic sectional view of a first embodiment of the device according to the invention, in which the upper sealing roller is moved,

3 a schematic cross section through the device according to the invention according to 2 .

4 a schematic sectional view of a second embodiment of the device according to the invention, in which the lower sealing roller is moved,

5 a schematic sectional view of a third embodiment of the device according to the invention, in which the upper and the lower seal roller are moved,

6 3 is a schematic sectional view of a fourth embodiment of the device according to the invention, in which the upper sealing roller is moved,

7 a schematic sectional view of a fifth embodiment of the device according to the invention, in which the upper sealing roller is moved, and

8th a schematic sectional view of a sixth embodiment of the device according to the invention, in which the lower sealing roller is moved.

WAYS FOR CARRYING OUT THE INVENTION

In 1 is one of a device according to the invention 10 to be processed web 12 before and after processing by the device 10 shown schematically. The material web 12 usually consists of an upper and a lower film web, between which flat products 14 should be packed. For the products 14 it may be, for example, wound plasters, therapeutic plasters or the like.

By means of a device 10 be on the edge of the web 12 in web direction 16 Longitudinal sealing seams 18 performed. The longitudinal sealing seams 18 are not made as a continuous sealing seams, but rather the longitudinal sealing seam 18 interrupted at certain intervals, so that in web direction 16 spaced-apart areas 20 on the longitudinal side of the material web 12 not with a longitudinal sealing seam 18 are provided.

Subsequently, by means of a device 22 Transverse sealing seams 24 performed. The transverse sealing seams 24 are placed so that by two transverse sealing seams 24 and two longitudinal sealing seams 18 a product 14 is enclosed on all sides, so that it can be airtight and sterile packaged. The transverse sealing seams 24 and the longitudinal sealing seams 18 each overlap in one area 25 , The overlapping can be done only partially as in the illustrated embodiment, but it would also be possible in the respective crossing region of the transverse seal 24 and a longitudinal sealing seam 18 to make a complete overlap.

In the last step, the material web 12 in individual flat bags 26 divided by the material web 12 each in front of an area 20 is cut through. The area 20 without longitudinal seam 18 thus serves as a peel tab 28 , by means of the flat bag 26 opened quickly and easily and the packaged product 14 can be removed.

In contrast to the embodiment shown in the drawing could also first the transverse sealing seams 24 and only then the longitudinal sealing seams 18 on the material web 12 be attached.

A dense flat bag 26 to receive in which the product 14 is packed sterile, must be longitudinal sealing seams 18 and transverse sealing seams 24 in the area 25 each at least partially overlap. Otherwise leaks would arise that would lead to the produced flat bag 26 would be sorted out as a committee during subsequent quality controls. The interruption of the longitudinal sealing seams 18 in the fields of 20 must therefore be able to take place at exactly predetermined positions, each of which would have to be well reproducible. Moreover, in order to achieve high web speeds, high cycle numbers must be used for interrupting the longitudinal sealing seams 18 to be possible. Ideally, that should be for a break 20 time required are well below half a second.

A first embodiment of the device according to the invention 10 is in 2 and 3 shown schematically. The device 10 owns in web running direction 16 each upper sealing rolls 30 and lower sealing rolls 32 , each about a rotation axis 34 . 36 rotatably mounted. Between the upper sealing rollers 30 and the lower sealing rollers 32 becomes the material web 12 passed. In the present example, the two upper seal roller 30 heated to an elevated temperature, while the two lower sealing rollers 32 not be heated. In contrast, the bottom two sealing rolls could 32 also be heated to a support temperature.

The upper seal roll 30 for producing a longitudinal sealing seam 18 is about her axis of rotation 34 on a holding unit 38 stored. The holding unit 38 is about a rotation axis 40 pivoted. For producing the longitudinal sealing seam 18 becomes the upper seal roll 30 by means of a clamping device 42 with a defined pressure against the lower sealing roller 32 pressed.

By means of a separator 44 can the upper seal roll 30 against the of the clamping device 42 applied pressure is cyclically raised to make the longitudinal sealing seam 18 to interrupt. At the holding unit 38 the upper seal roll 30 grab a pestle 46 with its upper end 48 at. The pestle 46 can be moved in its longitudinal orientation, with a displacement of the plunger 46 in the direction of the arrow 50 the holding unit 38 a little way clockwise 52 pivoted, causing a lifting of the sealing roller 30 entails.

Moving the plunger 44 in its longitudinal alignment via a drivable shaft 54 which is formed in the embodiment shown in the drawing as an eccentric shaft. At the wave 54 is the pestle 46 with its lower end 56 stored. By the rotation of the driven shaft 54 becomes the pestle 46 intermittently in its longitudinal direction (arrow direction 50 ) and lowered again, resulting in a corresponding raising and lowering of the upper sealing roller 30 entails.

By two parallel longitudinal sealing seams 18 to produce, the devices typically have two spaced apart upper sealing rolls and two spaced lower sealing rolls. Corresponding 3 have both upper seal rollers 30 each a separate holding unit 38 , each with its own pestle 46 attacks. With her lower end 56 are the two pestles 46 on a common wave 54 stored. The separator 44 thus comes with a single wave 54 out, each two transverse to the web direction 16 adjacent sealing rolls 30 move together.

In an alternative embodiment of the device according to the invention 10.4 according to 4 can instead of the upper seal roll 30.4 the lower sealing roller 32.4 by the drivable shaft 54 to be moved. In that case, then instead of the upper seal roll could be appropriate 30.4 the lower sealing roller 32.4 be brought to a relatively elevated temperature. On the drivable shaft 54 the separator 44.4 is the bottom end 56 a displaceable pestle 46 stored. The upper end 48 of the plunger 46 is at a deflection unit 60 stored. The deflection unit 60 can order one in 4 to the right offset axis of rotation 62 be pivoted, so when lifting the plunger 46 in the direction of the arrow 50 the left part in the drawing 64 the deflection unit 60 is also raised during the right part of the drawing 66 the deflection unit 60 is lowered. This right part 60 the deflection unit 60 is in one place 67 articulated with the holding unit 68 connected. The holding unit 68 becomes a little bit counterclockwise 70 around its axis of rotation 72 pivoted. At the holding unit 68 is the bottom seal roll 32.3 about its axis of rotation 36 stored. When pivoting the holding unit 68 in a counterclockwise direction 70 becomes the seal roll 32.3 thus a bit far from the material web 12 lowered.

In contrast to the embodiment shown in the drawing, other deflection units could be used to lift a plunger 46 a lowering of a lower sealing roller 32.4 to effect.

In 5 is a third embodiment of the device according to the invention 10.5 shown. In the device 10.5 is the upper seal roll 30 according to the in 2 illustrated embodiment and formed on a holding unit 38 stored. The execution of the lower sealing roller 32.4 corresponds to the in 4 illustrated embodiment of the sealing roller 32.4 with storage on a holding unit 68 , On the drivable shaft 54 the separator 44.5 is a pestle 46.5 with its lower end 56 stored. With his upper end 80 is the pestle 46.5 at the deflection unit 60 the lower sealing roller 32.4 stored. At the pestle 46.5 is an extension unit 82 firmly present, leaving the pestle 46.5 with its other upper end 84 on the holding unit 38 the upper seal roll 30 can attack. This can be achieved by a movement of the plunger 46.4 in the direction of the arrow 50 the extension unit 82 and thus the upper seal roll 30 be lifted up while simultaneously the lower seal roller 32.3 can be lowered down.

A fourth embodiment of the device according to the invention 10.6 is in 6 shown. The upper seal roll 30.6 is in this case on a holding unit 38.6 stored, the storage of the sealing roller 30 unlike that in 2 illustrated embodiment is not carried out at the end of the holding unit but in the central region. The holding unit 38.6 protrudes a little way over the sealing roller 30.5 in 6 left direction. At this left in the drawing 86 the holding unit 38.6 can the drivable shaft 54.6 the separator 44.6 attack. The wave 54.6 is in this case directly on the holding unit 38.6 the upper seal roll 30.6 stored. Will the holding unit 38.6 at the rotation of the shaft 54.6 through the same a little way clockwise 52 pivots, becomes the sealing roll 30.6 a little way up from the web 12 raised.

A fifth embodiment of the device according to the invention 10.7 is in 7 shown. In contrast to that in the 2 and 3 illustrated embodiment is the lower end 56 of the plunger 46 not directly on the drivable shaft 54 the separator 44.7 stored. Rather, it is the bottom end 56 of the plunger 46 at one end of a deflection unit 60.7 stored. The other end of the diverter 60.7 owns a role 88 , above the drivable shaft 54 is arranged. By the rotation of the driven shaft 54 becomes the diverter 60.7 a little way clockwise 52 pivoted, leaving the pestle 46 in the direction of the arrow 50 is moved upwards. This will also the holding unit 38 a little way clockwise 52 pivoted, causing a lifting of the upper sealing roller 30 entails.

Unlike the in 4 illustrated embodiment, the lowering of the lower sealing roller 32.4 also according to the in 8th illustrated embodiment of the device according to the invention 10.8 respectively. The deflection unit 60.8 the separator 44.8 is not over the top in it 48 of the plunger 46 on the holding unit 68 stored, but rather at the lower end 56 of the plunger 46 available. The other end of the diverter 60.8 owns a role 88 , below the drivable shaft 54 is arranged. By the rotation of the driven shaft 54 becomes the diverter 60.8 a little way counterclockwise 70 give away, leaving the pestle 46 in the direction of the arrow 50.8 is moved down. This will also the holding unit 68 a little way counterclockwise 70 pivoted, causing a lowering of the lower seal roller 32.4 entails.

To ensure a sufficiently dense and stable longitudinal seam 18 In the shortest possible time to produce, so that high web run times are achieved, are usually two or more devices according to the invention in the web running direction 16 arranged one behind the other. In each of the devices, the interruption of the longitudinal sealing seam must 18 at exactly the same point of the material web 12 respectively. Each of these successively existing device requires its own drivable shaft 54 . 54.6 ,

Unlike the in 3 another embodiment of the in the 4 to 8th illustrated cases are used to simultaneously two parallel longitudinal sealing seams 18 to create.

Claims (11)

Contraption ( 10 . 10.4 . 10.5 . 10.6 . 10.7 . 10.8 ) for producing at least one interrupted longitudinal seam ( 18 ) in a material web ( 12 ) - with at least one lower ( 32 . 32.4 ) and at least one upper seal roll ( 30 . 30.4 . 30.6 ) between which the material web ( 12 ), - with a clamping device ( 42 ), by means of which the upper ( 30 . 30.4 . 30.6 ) and the lower seal roller ( 32 . 32.4 ) are pressed together, - with a separating device ( 44 . 44.4 . 44.5 . 44.6 . 44.7 . 44.8 ), by means of which the upper ( 30 . 30.6 ) and / or the lower seal roll ( 32.4 ) against that of the clamping device ( 42 ) applied pressure are cyclically auseinanderdrückbar, - characterized in that - the separating device ( 44 . 44.4 . 44.5 . 44.6 . 44.7 . 44.8 ) at least one drivable shaft ( 54 . 54.6 ), over which the lower ( 32.4 ) and / or the upper seal roll ( 30 . 30.6 ) is movable in cycles. Device according to claim 1, - characterized in that - the upper ( 30 . 30.6 ) and / or the lower seal roll ( 32.4 ) on a holding unit ( 38 . 38.6 . 68 ) is rotatably mounted, - the holding unit ( 38 . 38.6 . 68 ) by the drivable shaft ( 54 . 54.6 ) directly or indirectly about a rotation axis ( 40 . 72 ) is pivotally mounted. Apparatus according to claim 2, characterized in that - at least one displaceable in its longitudinal direction ram ( 46 . 46.5 ) with its one end ( 56 ) indirectly or directly on the drivable shaft ( 54 ) of the separating device ( 44 . 44.4 . 44.5 . 44.7 . 44.8 ) and with its other end ( 48 . 80 . 84 ) directly or indirectly on the holding unit ( 38 . 68 ) of the seal roll ( 30 . 32.4 ) is stored in each case. Device according to claim 3, - characterized in that - The displaceable plunger is mounted against rotation on the drivable shaft. Device according to claim 2 or 3, - characterized in that - the displaceable plunger ( 46.5 ) on the one hand on the holding unit ( 68 ) of a seal roll ( 32.4 ) and on the other hand via an extension unit ( 82 ) on the holding unit ( 38 ) of the other sealing roll ( 30 ), - by means of the displaceable plunger ( 46.5 ) the lower seal roller ( 32.4 ) and the upper seal roller ( 30 ) are movable together, in opposite directions, respectively. Device according to one of the preceding claims, - characterized in that - two upper sealing rollers ( 30 ) and two lower sealing rolls ( 32 ), - the two upper sealing rollers ( 30 ) and the two lower sealing rollers ( 32 ) are present side by side with a predetermined, in particular variable distance. Apparatus according to claim 6, characterized in that - both upper sealing rollers ( 30 ) and / or both lower sealing rolls by means of a common drivable shaft ( 54 ) are movable in cycles. Device according to one of the preceding claims, - characterized in that - The drivable shaft is designed as a camshaft. Device according to one of the preceding claims, - characterized in that - the drivable shaft as an eccentric shaft ( 54 ) is trained. Device according to one of the preceding claims, - characterized in that - The drivable shaft is formed as a curve. Device according to one of the preceding claims, - characterized in that - A servo motor is provided as a drive for the at least one drivable shaft of the tennis device.

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