EP0849181A1 - Apparatus and method for packaging a roll of web material - Google Patents

Abstract

The material roll is wrapped using a standard width wrapping material wound round the roll in a spiral pattern. During wrapping the axial position of the roll is monitored. If the roll moves axially then the wrapping feed is adjusted accordingly to maintain a constant pitch and an even wrapping pattern. The axial position sensor is an out of contact type eg. ultrasonic sensor, proximity sensor. The wrapping is wound over the ends of the roll to provide spare wrapping which is folded down over the end faces of the roll. Both the wrapping feed and the end folding controls use the axial position signals to accurately operate on the roll.

Description

The invention relates to a device for packaging a roll of material web with a packaging web, the has a packaging web dispenser which is parallel to Axial direction of the web roll is movable and the packaging web at least in part of the axial Length of the web roll with an acute angle between their transverse direction and the axial direction of the Output web roll, and with a shelf on which is the material web roll.

The invention further relates to a method for packaging a roll of material web with a packaging web, the helical around the web roll is wrapped around.

A device and a method of this type are known GB 1 429 445 known. There is a plastic film guided helically around the roll of material web. At the axial ends, the angle between the packaging web dispenser and the web of material web again aligned to 90 ° and further turns of the Foil placed around the roll of material to end packaging to create. The so with a comprehensive packaging provided web of material is then passed through a heating furnace led to the plastic film on the web roll shrink.

The packaging of a roll of material with a helical packaging track has the Advantage that you can with a single packaging web width a variety of web rolls with different Can pack width. This makes it easier the stocking and also the handling because the packaging line can be narrower than the material web roll. Their weight is accordingly lower.

However, the use of plastic films is underneath Environmental considerations are not without concerns. The usage of wrapping paper as a packaging line but other difficulties. So you have to between the Body packaging, which is helical around the material web roll is led around, and the respective End packaging that is on the axial ends of the web roll due to the packaging web running in the circumferential direction a separation can be carried out. Then the packaging web must go back to the material web roll aligned and attached to this. This Principle is from the post-published DE 195 35 746 A1 known.

It has now been observed that the roll of material at Manufacture of the body packaging, i.e. in the case of a helix Wrapping the web of material with the Packing path, moves axially. This hike can can be one or even several centimeters. It may be due to the fact that Roll of material in the manufacture of the carcass packaging a larger diameter at one end than at the other End. It then moves with every revolution a small amount towards the larger one Diameter. Because a lot of turns to perform there is a correspondingly large migration movement. Under certain circumstances, this can be the case again Positioning the packaging web dispenser cause that the end packaging is no longer at the desired Place attached, but moved accordingly are.

The invention has for its object the quality to improve the packaging.

This task is the beginning of a device mentioned type in that a position sensor is provided, the axial position of the web roll determined on the shelf.

With the help of this position sensor information can now be won for a series of steps are very helpful in making the packaging. On the one hand, the axial position of the material web roll can now be on the shelf even before the start of the Determine wrapping. So it is no longer necessary the roll of material web is axially centered on the shelf to position, as is the case with conventional packaging devices the case is. It is only necessary the roll of material in a work area to position on which all necessary units, such as a packaging web dispenser or possibly Packing presses, folding devices, end cover feeding devices etc., have access. The web roll becomes practical by the feeder always placed in the work area. Because the step the additional positioning can be omitted, the entire Packaging process can also be shortened somewhat. When making the final packaging, the axial position the material web roll can also be determined, so that the final packaging can be positioned more precisely can. Since the packaging web dispenser is axially movable anyway no further measures need to be taken when the information about the axial position the material web roll is available.

The position sensor is preferably a distance sensor formed with an end face of the web roll cooperates. A single sensor can Determine a large number of positions. He determines one Distance to a reference point that is known. To this The position of the Determine the web roll.

It is particularly preferred that the position sensor is designed as an ultrasonic range finder. Such sensors work reliably with sufficient Accuracy. They are small and relatively inexpensive available.

The position sensor is advantageous in the axial direction movable, a position detector is provided, the the axial position of the position sensor is determined. The axial lengths of the web rolls in question are in the range of 0.5 to 3.8 m or even above out. The larger the range of a rangefinder is, the more complex it becomes or the more the fault tolerance is greater. If you look at the position sensor can move in the axial direction, then can one looks, for example, at a certain measuring range establish. The position sensor is then moved as long as until the distance to the front of the web roll is in the desired measuring range. The investigation the distance is then with relatively great accuracy possible. Because the position detector determine the reference point can, in contrast, the distance to the front the material web roll, the position results the roll of material web by adding the distance the face of the reference point and the distance the reference point from a base point, for example provided in a frame of the device can be and on which all other aggregates of the Can also refer to the device.

A folding device for folding one is advantageous axial projection of the packaging web on the End face of the web roll provided a movable carrier is arranged, the position sensor is connected to the carrier. At this Design you can use the position sensor together the folding device in front of the end of the roll of material web move. Such a movement of the folding device is necessary anyway if you have the axial Overlap of the packaging web on the front of the Wants to fold the web roll. The folding device but must also for different diameters packaging material web rolls be suitable for example, move in the range of 0.5 to 2.5 m can. By coupling the position sensor to the Carrier of the folding device also saves one work cycle. The folding device must be in the course of the packaging be pivoted towards the front anyway. This retraction can also be preferred, so that too this means that the packaging process is shorter overall can be held. It is also an advantage that the position sensor then also the position of the final packaging can determine so that the folding device be positioned in the correct position on the material web roll can to the excess of the final packaging with the to be able to fold the desired dimensions on the front.

The folding device advantageously has a rotatable one Folding bike on and the position sensor is on an auxiliary carrier arranged, which protrudes radially over the folding bike. The position sensor can therefore by the folding bike not be covered. He is standing with one swung in or retracted folding device preferably radially inwards to the middle of the face the roll of material in front, so that it faces the front recorded in every case, regardless of the diameter of the Roll of material web. Such a subcarrier is in provided for in many cases anyway as a probe arm, that when the protrusion is folded in on the front side holds an inner front cover.

The position sensor detects with particular advantage the axial position of the roll of material web at least during a rotational movement of the material web roll continuously. As mentioned at the beginning, the helical wrapping of the web roll with a packaging web made of wrapping paper not one more negligible migration. If so the position of the web roll is continuously monitored then you can go faster if errors occur intervention. Major damage can then be avoided.

This is especially true when the position sensor is connected to a control device which controls the axial position of the packaging web dispenser. The packaging web dispenser is moving at a speed move parallel to the axis of the material web roll, resulting from the slope of the helix and the peripheral speed or the speed of the roll of material web results. If you add the axial movement of the material web roll is taken into account, which is quite an error of one or more percent based on the length of the web roll can be taken into account, then you still achieve one better quality, i.e. the packaging line can then even more uniform and denser across its entire width be placed on the web of material. A tear the packaging line due to the migration movement can be avoided because the migration movement during The advance of the packaging web dispenser is taken into account becomes. Even when manufacturing the final packaging minor irregularities are compensated for itself through the axial movement of the web of material can result.

A packing press is advantageously for each end face and a folding device is provided, each are movable in the axial direction, the two Packing presses and / or the two folding devices independently are positionable from each other. Usually the packing presses move together to the axial center the packaging device and put the outer end covers at the end of the web of material or on the folded supernatant. This has the advantage that external axial forces on the Compensate the web roll with each other. Because the web roll but when making a helical one Body packaging from the axial center or moved from an axial position at all, such an approach would result in a pack press rather hits the web of material than the other. It then pushes the web roll with their speed towards the other packing press.

The material web roll and packing press then meet there double speed on each other, which is quite can cause the packaging to burst. About that in addition, such an approach causes one considerable wear on the pack press drive because of Packing press drive the entire weight of the material web roll must move. Basically, the same applies also for the folding equipment. Here too results there may be considerable wear. If you now control the drives independently, then you can both the packing presses and if necessary the folding devices independently to the respective end faces of the material web roll process and one for the drives and the material web roll achieve gentle packaging. This too improves the quality of the packaging.

The task is in a method of the aforementioned Art solved in that the axial position of the Roll of material continuously determined during winding and the axial feed of the packaging web dispenser also taking into account the current axial position of the web roll is controlled.

The packaging line can then look much better create the scope of the web roll. The axial Movement that occurs in helical packaging the material web roll occurs is compensated. Of the Packaging web dispenser is correspondingly faster or slower parallel to the axial direction of the web roll proceed so that its current position always is so that the packaging web over the entire surface Scope of the material web roll comes to the plant. Would the packaging web dispenser advance, i.e. the migration movement disregard the web roll, then the front edge of the packaging web is not with the same tension as the rear edge.

The leading edge may not solve easier. Conversely, there is a lag of the packaging web dispenser compared to the actual one Target position when winding the corresponding problem for the rear edge of the packaging web. If one now continuously the position of the material web roll determined, then you can the packaging web dispenser control that axial migration of the web roll be compensated. The ongoing investigation the position can either be continuous or at short intervals. The distance between each However, measurements may only be so large that the information obtained therefrom to correct the axial feed of the packaging web dispenser used can be.

Preferably, before the start of winding, the axial Length of the web roll determined. With that stands the axial position of both end faces of the web roll fixed, even though you only have a single position sensor needed. This not only saves you additional sensor, but also in operation Evaluation of a second signal necessary equipment.

Fig. 1-3

verschiedene Schritte beim Herstellen einer Umfangsverpackung einer Materialbahnrolle,

Fig. 4

eine Vorrichtung zum Verpacken und

Fig. 5

eine schematische Schnittansicht V-V nach Fig. 4.

The invention is described below with reference to a preferred embodiment in conjunction with the drawing. Show here:

Fig. 1-3

different steps in the manufacture of a peripheral packaging of a roll of material web,

Fig. 4

a device for packaging and

Fig. 5

4 shows a schematic sectional view VV according to FIG. 4.

The packaging of a roll of material web 2 is schematic shown in Figs. 1 to 3. With the material web roll are relatively large structures with a axial length of up to 3.8 m or greater. The lower limit is in the range of 0.5 m. The diameter is in the range of 0.5 to 2.5 m. Is packed the web roll 2 with a much narrower Packaging web 3 with a width in the range of 0.35 to 0.8 m, preferably about 0.5 m, for this purpose from a Packaging web dispenser 4 is delivered. The packaging web dispenser is on the one hand on rails 5, 6 Can be moved parallel to the axial direction of the material web roll. On the other hand, it is rectangular from one direction to the rails 5, 6 rotatable in one direction, in which he pointed with the rails 5, 6 Includes angles, as shown in Fig. 1. Accordingly, he issues the packaging web 3 that Wrapping paper is made at an appropriate angle out. If now the packaging web 3 around the material web roll 2 is wound, for which the material web roll 2 on support rollers 7, 8, one of which is driven, is rotated, then there is a helical Body packaging 11, which is essentially about the entire axial length of the web roll 2 extends. Here, the packaging web 3 can also over the end faces 9, 10 of the material web roll 2 survive.

If the packaging web dispenser 4 the body packaging 11 has completed, i.e. the packaging line 3 helically from one end of the web roll to the other, it is on the left End of web roll 2. He will then how this is shown in Fig. 2, again at right angles the rails 5, 6 aligned. The packaging line 3 is then with the formation of an axial projection 12th wrapped around the web roll 2. It follows this results in a final packaging 13. Between the winding process, which is shown in Fig. 1, and the winding process, which is shown in Fig. 2, the packaging web 3 separated. After making the final packaging 13, the packaging line 3 is also severed. The packaging web dispenser 4 then moves to the other axial end of the web roll 2 and produces a similar end package 14 there also has an axial projection.

It can now be observed that the material web roll when manufacturing the body packaging 11 (Fig. 1) axially migrates towards the larger diameter there, i.e. 1 to the right. This wandering movement one can measure the length of about 1 to 2 cm per meter Estimate the web roll.

This migratory movement brings with it some problems yourself. The feed rate of the packaging web dispenser 4, parallel to the axis of the web roll 2 is moved, axially depends on its position remaining web roll only from the pitch angle the packaging web 3, the scope of the roll of material web 2 and the speed of rotation of the web roll 2 on the support rollers 7, 8 (via which the Drive). If now the web roll 2 moves axially, for example in Fig. 1 after right, then the assignment between the packaging web dispenser is correct and the web roll 2 not more so that the packaging web 3 is no longer smooth the scope of the web roll is created.

At the end of the body packaging 11, the packaging line should a certain, well-defined supernatant have the end face 10 of the material web roll 2. If the material web roll 2 has moved, then this supernatant can be changed, which is undesirable.

The end packaging 13, 14 should also be so Material web roll 2 are wound that a predetermined axial protrusion arises. Wouldn't you take additional measures but assume that the material web roll 2 remains in place, then the axial protrusion 12 of the final packaging would be 13 too large and that of the end packaging 14 too small.

To work around this problem is a position sensor 27 provided as an ultrasonic range finder is trained. The location and operation of the position sensor 27 should now be used in connection with FIGS. 4 and 5, the packaging device Show 1 in more detail.

In addition to the packaging web dispenser 4 are for each end the material web roll 2 has a packing press 15, 16 shown. Each packing press has a drive 17, 18 on, with the help of them on a rail 19, 20 in Is movable in the axial direction. The drive can too are formed by a piston-cylinder arrangement, between the respective packing press 15, 16 and one Not shown frame of the device 1 arranged is. The drives 17, 18 are independent of one another.

There is also a folding device 21 for each end face, 22 provided. Each folding device 21, 22 is in the axial direction movable. It instructs in a known manner Impeller 23 and an axle extension 24. The axis process 24 is on the scope of the web roll hung up. The impeller 23 rotates along the rotating web of material and folds the axial Overhang 12 of the final packaging 13 on the front side 10 of the material web roll 2. The same thing happens at the other end 9.

As a special feature it should be mentioned here that each Folding device 21, 22 with a position indicator 25, 26 is provided, with the help of the axial position of the Folding device 21, 22 can be determined.

The position sensor 27 is now on the folding device 21 arranged. The folding device 21 has a carrier 28, with which it is shown in FIG Location can be pivoted down so that it can be used its axis extension 24 on the circumference of the web roll 2 can be placed. This position is out Not shown for reasons of clarity.

An auxiliary support 29 is attached to the support 28, on which the position sensor 27 is arranged so that it is radial protrudes beyond the impeller 23. If the carrier 28 is pivoted about the folding device 21 in the folding position bring what in the present embodiment an angle in the range of 45 ° to 90 ° is required then the position sensor 27 is located the end face 10 of the material web roll 2. He can now the distance between its position and the face Determine 10 of web roll 2. His position is known via the position detector 25, so that can be easily determined on which axial Position in relation to the device 1, the roll of material web 2 is located.

An auxiliary carrier 29 can also be, for example, one Use the probe arm when folding in the axial projection 12 of the final packaging 13 on the end face 10 the material web roll 2 serves an inner end cover to hold on.

With the help of the position sensor 27, the Design the packaging process as follows:

The web roll 2, its axial length and its Diameter has previously been determined, that is known is inserted into the packaging device 1, i.e. deposited on the support rollers 7, 8. Here it is now no longer required that the web of material 2 between the two packing presses 15, 16 or on one other center position is centered. It is enough, if so inserted into the packaging device 1 is that each end face 9, 10 both from the associated Packing press 16, 15 and the folding device 22, 21 can be reached. But this is practical always through the normal transport of the material web roll 2 in the packaging device 1.

As soon as the material web roll 2 on the support rollers 7, 8 lies, the folding device 21 is at an axial distance pivoted to the front side 10 of the material web roll 2. The axial distance can be, for example by realizing that the folding device 21 in its outermost position (left in Fig. 4) is moved. Of the Position sensor 27 can now the distance between the Determine face 10 and its position. If this Distance is not in its measuring range, then the folding device 21 can move axially for so long until the distance is within the measuring range.

The axial position is then determined by adding the distance between the position sensor 27 and the position of the position sensor 27, which by the position detector 25 is determined. The position detector 25 can be an evaluation device, for example which counts pulses from a stepper motor 30, with the help of which the folding device 21 can move axially becomes.

Since the axial length of the web roll 2 is known after measuring the position of the Front 10 also the position of the front 9 Packaging web dispenser 4 can be axially in its starting position move and swiveled to the correct angle will. It then produces the Body packaging 11, wherein the position sensor 27 continuously or quasi continuously the axial position the end face 10 monitors. The feed rate of the packaging web dispenser parallel to the axial direction The web of material roll 2 is also taken into account the moving movement of the material web roll 2 controlled by a control device 31, the one with the position sensor 27 and the position detector 25 is connected.

Since after the completion of the body packaging 11 the positions the end faces 9, 10 still or again are known, the end packaging 13, 14 in the correct position be applied.

Then the folding devices 21, 22 can be exactly in the positions are driven to form a optimal folding of the overhang on the end faces necessary is. This is also only possible if the axial position of the end faces 9, 10 is known is. Since the material web roll 2 is no longer in the center lies, however, it is necessary that the folding devices 21, 22 each independently controllable are. So it is possible that the two folding devices 21, 22 different routes, before they come to rest on the material web roll 2.

The same applies to the packing presses 15, 16. After the The position sensor 27 can fold in the excess under certain circumstances no longer the axial position of the Determine end faces 9, 10 But then he determines the axial position of the folded supernatant, so that it is possible to get the packing presses 15, 16 there method. Around the outer end covers that are with the packing presses should be applied, then with the necessary The packing presses can then attach pressure continue to be pressure-controlled. It is also possible, a pressure or tactile sensor on each pack press to provide a signal when the pack press, more precisely their press plate, with the necessary Pressure on the front of the web roll is present.

With such a device 1 it is possible to be relative to achieve high packaging speeds, for example of about 300 m / min for the packaging line 3. The migration movement of the material web roll increases 2 with increasing speed. This is but not critical due to the measures taken.

Claims (11)

Device for packaging a roll of material web with a packaging web that is a packaging web dispenser has, which is parallel to the axial direction the web roll is movable and the Packaging web at least in part of the axial Length of the web roll with an acute angle between their transverse direction and the axial direction the web of material outputs, and with a Tray on which the material web roll lies, thereby characterized in that a position sensor (27) is provided, the axial position of the web roll (2) determined on the shelf (7, 8). Device according to claim 1, characterized in that the position sensor (27) as a distance sensor is formed, which has an end face (10) the material web roll (2) interacts. Device according to claim 2, characterized in that the position sensor (27) as an ultrasonic range finder is trained. Device according to one of claims 1 to 3, characterized characterized in that the position sensor (27) is movable in the axial direction, with a position detector (25) is provided which is the axial position of the position sensor (27) determined. Device according to one of claims 1 to 4, characterized characterized in that a folding device (21) for folding in an axial projection (12) Packing web on the front side (10) of the material web roll (2) is provided on a movable Carrier (28) is arranged, the position sensor (27) is connected to the carrier (28). Device according to claim 5, characterized in that the folding device (21) is rotatable Folding bike (23) and the position sensor (27) is arranged on an auxiliary carrier (29) which is radial protrudes over the folding bike (23). Device according to one of claims 1 to 6, characterized characterized in that the position sensor (27) the axial position of the material web roll (2) at least during a rotational movement of the material web roll (2) continuously determined. Device according to claim 7, characterized in that the position sensor (27) with a control device (31) is connected to the axial position of the packaging web dispenser (4) controls. Device according to one of claims 1 to 8, characterized characterized in that for each end face (9, 10) a packing press (15, 16) and a folding device (21, 22) is provided, each in the axial direction are movable, the two packing presses (15, 16) and / or the two folding devices (21, 22) can be positioned independently of each other are. Process for packaging a roll of material with a packaging line that is helical around the web roll is wrapped around, thereby characterized in that the axial position of the web roll continuously determined during winding and the axial feed of the packaging web dispenser also taking into account the current controlled axial position of the web roll becomes. A method according to claim 10, characterized in that before the start of winding the axial length the material web roll is determined.

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