EP0849179B1 - Device for packaging a roll of web material by means of packaging web - Google Patents

Description

The invention relates to a device for packaging a material web roll with a packaging web a packaging web donor who the packaging web at an adjustable angle to the radial direction of the Output web roll that is parallel to the axial direction the web roll is movable and on the a supply roll of the packaging web is arranged, and with a drive for the web roll to be packaged.

Such a device is known from GB 1 429 445. There the web of material, for example a paper roll, preferably wrapped with a plastic film. The plastic film has a much smaller width than the web roll to be packed. When packaging the plastic film is first circumferentially aligned to the web roll and attached to it. The roll of material web is then rotated, so that there is an edge or final packaging. To the packaging web dispenser becomes a predetermined number of turns then twisted a bit, i.e. the width direction the packaging line leaves its orientation parallel to the axis of the roll of material to be packed and then closes a great one with it Angle on. When the web roll continues to rotate the packaging web dispenser becomes parallel at the same time move to the axis of the material web direction, see above that there is a helical packaging.

A similar principle is from the post-published DE 195 35 746 A1 known. Here is packing paper for packaging used, the specific gravity in general is slightly higher than that of plastic film.

EP 0 431 922 A1 describes a device for packaging a roll of material web, in which a packaging web dispenser, the parallel to the web of material to be packed is arranged, its own drive of the packaging web roll. The packaging line has a width along the axis of the packaging web roll that is sufficient to deal with a single rotation of the web roll, this completely wrap.

The advantage of screw packaging is that one with a single packaging web width can pack wide web rolls. You don't have to Packing lanes with different widths ready hold. The screw packaging makes it easier Stocking up with packaging material and therefore can increase the economy of a roll packaging.

The disadvantage, however, is that it is no longer sufficient the web of material to be packed accordingly the number of desired packaging web layers to rotate, for example two or three times. Required is rather a multitude of turns, until the material web roll along its longitudinal extent is enveloped. This requires a longer packaging time. The possibilities, the packaging speed to increase are limited. Especially when using it of wrapping paper there is a risk that the packaging web tears when the winding speed is within should be increased sharply in a short time. This but is a prerequisite for ever higher packaging speeds to achieve.

The invention has for its object the packaging times to keep short.

This task is the beginning of a device mentioned type in that the packaging web is formed from wrapping paper, and that the supply roll one Controllable rotary drive which has the supply roll at the start of a winding process accelerates and brakes at the end, and a control device the circumferential speed is provided the supply roll on the peripheral speed the material web roll and the stock roll adds a share by the axial displacement of the packaging web dispenser.

This is a relatively simple measure it is now possible to change the packaging speeds entirely to increase significantly, i.e. the speed at the packaging web around the material web roll to be packed is placed. Experiments have shown that one easily achieve web speeds of 300 m / min can. These speeds can be due to the drive of the supply roll after a very short acceleration time can be achieved, so that one the high packaging speed over a large Maintain part of the axial length of the web roll can. The controllable rotary drive drives the Supply roll at the beginning of the winding process and brakes they end up. This eliminates the need at the beginning the supply roll for the packaging line alone accelerate due to the train in the packaging line. Rather, the packaging web is taken from the supply roll so to speak delivered to the extent that as needed to pack the web roll becomes. The large moment of inertia of the supply roll for the packaging line is then driven by the rotary drive compensated. Conversely, the rotary drive brakes at the end of the winding process, the supply roll, so that no significant Excess packaging web arises. Accordingly can also keep the braking times short become.

In the simplest case there is a diameter sensor which determines the diameter of the packaging web roll. The peripheral speed of the web roll is usually known because of the web roll lies on support rollers, at least one of which is driven. The thicker the diameter of the packaging web roll decreases, the higher their speed, the pull-off speed resulting from the peripheral speed of the supply roll results on the peripheral speed agree to the web roll can. The vote does not have to mean that the peripheral speed the material web roll with the peripheral speed the supply roll exactly matches.

In a particularly advantageous embodiment, that the packaging web dispenser is a preferred device with at least one driven feed roller having. So now the speed the packaging web even better at the peripheral speed adjust the web roll to be packed.

The preferred roller expediently acts with a counter roller together. In the nip thus formed the speed of the packaging line is defined. This can meet the requirements for the accuracy of the Rotary drive can be reduced. It doesn't come anymore essential to ensure that the packaging line with exactly added to the speed of the supply roll with which it is delivered to the material web roll becomes. Rather, minor deviations can vary from the preferred device can be compensated. This can also ensure that a certain tension in the Packaging web between the material web roll and the Preferred device is applied so that one very tight packaging of the material web roll achieved.

A separation device is advantageously provided between the material web roll and the preferred device is arranged. So you can at the conclusion of a Separate the material web. The web of material but remains in the preferred facility, so that it can still be driven. So she can without additional measures being required pushed back to the roll of material to be packed if this is for another winding step is required or it can be advanced when packing a new web roll is. The separating device can be used, for example, as a knock-off knife be trained. You can also make that the preference device at the moment of disconnection generates a slightly higher web tension, i.e. that the Packaging web before immersing the cutting knife is more taut than when winding.

An adhesive mediator is advantageous between the roll of material web and the separating device arranged. The adhesive placement device can, for example, an adhesive application device exhibit. If a packaging line with already applied Adhesive is used, for example with a water-soluble cold glue, then the adhesive device also simply in a humidifier or water application device exist. If a heat-activated adhesive on the packaging web a heater can also be applied act as an adhesive agent. As a result of that this adhesive device between the web of material and the separating device is arranged, it is ensured that the packaging line is always up to can be made sticky in the end. Furthermore ensures that the separator is clean remains, i.e. does not come into contact with adhesive. Both the preferred device and the adhesive device are at the packaging web dispenser arranged, i.e. on a sled with him, the parallel to the axial direction of the roll of material to be packed can be moved. This will Paths and response times kept very short.

The rotary drive advantageously acts on the axis the supply roll. This allows very sensitive control options can be achieved. The packaging line is spared what, for example, when using of carrier rollers for the packaging web not in this Scope would be the case. The rotary drive can immediately act on the packaging web roll without one Slip or friction should be noted.

The packaging web dispenser advantageously has a guide surface on which the packaging line up to a support roller slides on which the material web roll is stored. The packaging web dispenser is convenient arranged laterally next to the web roll. This makes it easier to load the packaging web dispenser with the supply roll. This does not have to be the case be lifted up excessively. However it is then not so easy anymore, the packaging line up to Bring material web roll or even attach to it. If you now provide a guide surface, then this problem is solved with relatively simple measures solved. The packaging web has a certain inherent rigidity on. If you now, for example through the Preferred device, advanced on the guide surface , it reaches the carrier roller on which the Material web roll is stored. With another feed it then gets between the web of material and the idler roller and then the joint action the material web roll and the support roller promoted. Because the packaging web has been made sticky is, it sticks to the roll of material web, so that when the roll of material web continues to rotate, the packaging can be manufactured. Further "threading aids" are not required.

It is particularly preferred that the guide surface is formed in several parts, at least one of the Support roller adjacent part of the guide surface retractable is. The closer the guide surface is to the carrier roller reaches, the easier it is leading the packaging line. At the same time the guideway then the subsequent winding process hinder, especially at higher speeds, where vibrations cannot be excluded. If you can now retract the "front" part of the guide surface the distance between the Guide surface and the support roller and thus the web roll again. But you can also do this easily do because during the actual packaging process Guiding the packaging line on the guiding surface is no longer required.

The end adjacent to the support roller preferably has the guide surface has an arcuate course. There the packaging web dispenser with different angular positions to the material web roll and thus also to the support rollers must be aligned, results in the formation of the front of the guide surface with an arcuate course the possibility of the gap between the guide surface and the support rollers in practical all angular positions that are permissible are constant to keep. It is therefore always ensured that the packaging line with the necessary reliability threaded between the web roll and the support roller becomes.

Fig. 1

eine schematische Draufsicht auf eine Verpackungsvorrichtung,

Fig. 2

eine schematische Seitenansicht,

Fig. 3

einen vergrößerten Ausschnitt aus Fig. 2 und

Fig. 4

eine Draufsicht auf eine Führungsfläche.

The invention is described below with reference to a preferred embodiment in conjunction with the drawing. In it show:

Fig. 1

1 shows a schematic top view of a packaging device,

Fig. 2

a schematic side view,

Fig. 3

an enlarged section of Fig. 2 and

Fig. 4

a plan view of a guide surface.

1 and 2 show a packaging device 1 for packaging a roll of material 2, for example a larger roll of paper from 0.8 to 2.5 m in diameter and 0.8 to 3.8 m in length. The material web roll is packed 2 with a packaging web 3 made of wrapping paper with a width of at least 350 mm, preferably about 500 mm, unwound from a supply roll 4 becomes. The supply roll 4 is on a packaging web dispenser 5 (Fig. 3) arranged. As from Fig. 1 can be seen, the packaging web dispenser 5 a position shown on the left, in the transverse direction the packaging web 3 parallel to the axial direction of the Material web roll 2 lies, twisted or pivoted are in a position shown further to the right, in the the transverse direction of the packaging web 3 a sharp Includes angle with the axis of the web roll 2. The transverse direction of the packaging web 3 is the direction that is at an angle of 90 ° to the longitudinal extent the packaging web 3 runs. She is right in the present embodiment corresponds to the direction the axis 6 of the supply roll 4.

The material web roll 2 is now packaged as follows: First, the packaging web dispenser 5 in at an acute angle to the axis of the material web roll 2 rotated, i.e. he takes the one shown on the right in FIG. 1 Position on. The one on top with Adhesive packaging web 3 is in the gap between the support roller 7 and the web roll 2 threaded. One of the two support rollers 7, 8 is driven. If the web of material rolls now, the packaging line is in the form of a helix wrapped around the web roll. Here the Packaging web dispenser 5 parallel to the axial direction of the Material roll 2 shifted. If the packaging line 3 reaches the other end of the material web roll 2 it is separated again.

The packaging web dispenser 5 is then aligned in such a way that that the packaging web 3 at right angles to Material web roll 2 is. Here it forms one axial protrusion. The one on top with glue provided packaging web 3 is advanced, until they are between one of the support rollers 7, 8, on which the web roll 2 is stored, and the web roll 2 arrives. If the packaging line 3 accordingly If it gets into this "gap", it will be taken along. After a predetermined number of turns the material web with the aid of a separating device 9, which has a tee knife 10, separated.

Then the packaging web dispenser 5 to the other End of web roll 2 and the other End also with axially protruding packaging Mistake. This supernatant can then be removed using a Folding wheels 11 that for each end of the web roll 2 is provided (not shown in Fig. 1) the front of the web roll 2 are folded. Packing presses 12 can then be operated in order to so-called outer end covers on the folded Apply and fasten the supernatant.

From this process it is clear that the packaging line 3 when packing the web roll in several Sections is used. Each section can be viewed as own winding process can be viewed, in which the Packaging web 3 together with the material web roll 2 accelerated and braked again. In particular in the helical winding of the packaging web 3, i.e. when making a so-called Body packaging, it is important as soon as possible to achieve a high winding speed to the To keep packaging time short.

3 now shows an enlarged illustration of the packaging web dispenser 5, with which this goal is realized can be.

The packaging web dispenser 5 is on a carriage 13 arranged on rails 14 parallel to the axial direction the web roll 2 can be moved. On the carriage 13 is a large diameter bolt 15 provided the fulcrum for the packaging web dispenser 5 forms relative to the carriage 13. A drive 16 is provided for twisting, which only is shown schematically.

The supply roll 4 of the packaging web 3 is with her Axis 17 on a stand 18 on the packaging web dispenser 5 hung. The axis 17 is rotatably driven here, i.e. a rotary drive 19 is operatively connected with the axis of rotation 17. The rotary drive 19 can Both accelerate and brake supply roll 4.

The packaging web 3 runs from the supply roll 4 via deflection rollers 20, 21 to a preferred device 22, the nip 23 with a driven Has roller 24. The packaging line 3 is with the help a pressure roller 25 against the driven roller 24th pressed. For this purpose, a piston-cylinder engine 26 is provided.

Then follows in the direction of travel of the packaging web 3 Separating device 9 with the knives 10 and after an adhesive device 27, with the Help the packaging web 3 sticky on its top 28 can be made. In the present embodiment it is a glue application device.

There is also a preference device 21 Guide surface 29, the top view of which is shown in FIG. 4 is. The guide surface 29 is in two parts here educated. Your rear part 30 is the preferred device 22 adjacent. Your front part 31 is displaceable educated. It can retract under the rear part 30 become. However, as shown in FIG. 4, be extended. In the extended state it is the support roller 7 closely adjacent, as it can be seen for example in Fig. 2.

The front part 31 has a rounded front end 32 on. The rounding can also be done by a sequence of short straight sections. By this configuration it is possible that the front End 32 regardless of the angular position of the packaging web dispenser 5 at a very short distance from Carrier roller 7 can be held. This ensures that the packaging line that over the guide surface 29 is advanced, always in the gap between Material web roll 2 and support roller 7 arrives.

Now when the packaging process begins, i.e. the material web roll 2 accelerated on the support rollers 7, 8 is, with the help of the rotary drive 19 also the supply roll 4 accelerates the packaging line 3. Fine-tuning the speed of the packaging line 3 in relation to the peripheral speed of the Material web roll 2, with a certain tension in packaging 3 when winding onto the web of material 3 is then maintained by the preferred device 22. Because the moment of inertia the supply roll 4 practically completely from that Rotary drive 19 of the supply roll 4 is overcome the loading of the packaging web 3 by tensile stresses kept extremely low. Still can high winding speeds and above all high acceleration values achieve.

At the end of the packaging process, the supply roll 4 with the help of the rotary drive 19 in exactly the same Decelerated in the same way as the material web roll 2 there is practically no excess of packaging web 3, that should be included.

The packaging web dispenser 5 also has one Sensor 33 on that continuously the diameter of the Supply roll 4 determined, for example without contact with the help of light beam reflection. The smaller the The diameter of the supply roll 4 is, the higher the Speed so that the same packaging web speed can be achieved. In not shown A control device is provided which both the drive of the support rollers 7, 8 and Rotary drive 19 and the preference device 22 controls and coordinated so that the packaging web 3rd with the necessary tension around the web roll 2 is placed without the voltage being so high is that the packaging web 3 is overused.

Since both the driven supply roll 4 and the Vorzguseinrichtung 22, the separator 9 and the Adhesion mediation device 27 on the slide 13 are arranged, can be a very compact unit realize with the high winding speeds and thus short packaging times can be realized.

Claims (8)

1. Device for packaging a roll of web material (2) with a packaging web (3), comprising a packaging web dispenser (5) which delivers the packaging web at an adjustable angle relative to the radial direction of the roll of web material, which is movable parallel to the axial direction of the roll of web material and on which a supply roll (4) of the packaging web is arranged, and comprising a drive for the roll of web material to be packaged, characterised in that the packaging web (3) is formed of wrapping paper and that the supply roll (4) has a controllable rotary drive (19) which accelerates the supply roll (4) at the beginning of a winding process and slows it down at the end, and a control device which coordinates the circumferential speed of the supply roll (4) with the circumferential speed of the roll of web material (2) is provided.
2. Device according to claim 1, characterised in that the packaging web dispenser (5) has a feed device (22) with at least one driven feed roll (24).
3. Device according to claim 2, characterised by a separating device (9) arranged between the roll of web material (2) and the feed device (22).
4. Device according to claim 3, characterised in that an adhesion-promoting device (27) is arranged between the roll of web material (2) and the separating device (9).
5. Device according to one of claims 1 to 4, characterised in that the rotary drive (19) acts on the axis (17) of the supply roll (4).
6. Device according to one of claims 1 to 5, characterised in that the packaging web dispenser (5) has a guide surface (29) on which the packaging web (3) slides up to a supporting roll (7) on which the roll of web material (2) is supported.
7. Device according to claim 6, characterised in that the guide surface (29) is made up of several parts, at least one part (31) of the guide surface (29) adjacent to the supporting roll (7) being retractable.
8. Device according to claim 6 or claim 7, characterised in that the end (32) of the guide surface (29) adjacent to the supporting roll (7) has an arcuate shape.

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