EP1574432A1 - Dual contact system for folding in a concertina-fashion - Google Patents

Abstract

The device has stretching devices and a stretch tightening clamp for stretch tightening a hood like stretch foil (15) that is stretched in a cross-wise direction over individual good to be packed. Each stretching device has two stretching units, which simultaneously act in two contact areas (Z1, Z2) such that the foil sections located between the areas are arranged on the clamp without one overlapping the other. Each stretching device includes rollers that are driven by a single motor. An independent claim is also included for a process for wrapping palletized individual goods.

Description

The invention relates to a device for wrapping preferably palletized General cargo with a tubular or hood-shaped stretch film according to the preamble of Claim 1, and a corresponding method.

Devices of the generic type are, as regards their basic components, usually comparable to those of European Patent Application 0 344 815 A1 described device. They consist of a machine frame, on a regular basis a lifting frame (in approximately vertical direction) is moved up and down. The lifting frame usually carries the reef brackets, which in turn are opposite the lifting frame in Transverse direction (ie in approximately horizontal direction) are movable to the stretch film after stretching the stretch film, stretch across the reef bows transversely, d. H. to be able to stretch elastically, ie to be able to produce the so-called horizontal stretch. A horizontal or transverse stretch of 10% to well over 50%, based on the unstretched dimensions of the stretch film in the transverse direction. The reef bars can be very be configured differently. The possibilities here range from a very simple, finger-like design up to the reefing for a stronger stretch, which often have a T-like shape by being made up of a substantially vertical one Shaft for holding the reefed stretch films and one worn in the substantially horizontally extending, executed with a certain radius of curvature Section that held the relevant corner of the clamps held on the reef bars Foil forms around. To refill a tubular or hood-shaped stretch film, The reef bars are regularly in the inner, lower end of the tubular or dome-shaped Stretch film introduced. By means of Refforganen then the section of the stretch film, which will later cover the side surfaces of the cargo to be packaged, on the reef stirrups reefed.

As a Refforgan in the local context that part of the device is understood, which is brought to the arrival of the stretch film in contact with this and by means of his Actuator appropriately applies forces to the stretch film, so that overcoming them the frictional forces on the reef bars in accordion-like Wrinkles on the reefing brackets are being grabbed. Usually, each reef bar is a Refforgan assigned in the form of a motor-driven Refrefolle. The Refforgan can usually be approached to the respective reef bracket that its refresh under Using the reef bar as an abutment presses on the stretch film and so taking advantage The friction forces the stretch film pulls on the reef bar, so hit can. The stretched stretch film then settles in said accordion-like folds on the reef bars off.

The finished stretched stretch film section is then processed by appropriate method the reef bar transversely, ie i.d.R. stretched in a largely horizontal direction. In doing so, any wrinkles, and in particular the said accordion-like folds, will become strongly pressed together. As a result, two or more layers come at various points of stretch film strongly pressed against each other - seen in the horizontal direction - each other to lie, so it form wrinkles, which can be described as "Überlappfalten".

The coefficient of friction "film against film" is generally smaller than the coefficient of friction "Foil against reef bow". The first when pulling the stretch film from the Reef bars (during the stretch film coating process) in motion and on Ideally, the lapping pylons sliding along the reef bows tend to have themselves in the course of sliding along the reef hanger to pull apart so far that the overlap is lifted before the overlap patches the upper edge of the respective reef bar reached. Nevertheless, it happens again and again that individual Überlappfalten itself do not pull apart fast enough but jump off the reef bar unsmoothed. In In this case, there is a whipping expansion of the overlap, the individual film layers are no longer frictionally pressed against each other as soon as the Crease was removed from the reef bar. This often leads to thin drawing of the stretch film and thus to tearing.

Furthermore, with modern reefing bars, tearing of the film can already occur come when an overlapping ply even the area of the top side of the discharge side reached Reffbügels and pulled apart there only. Because modern Reffbügel are designed so that the highest stress of the stretch film hood in the area the trigger-side upper edge of the reefing occurs.

In practice, various approaches have already become known in order to do justice to become.

So it has already become known, the reef bow, seen in the vertical direction, sufficient to carry out long and the Refforgane accomplishing the impact on the reef hanger with their driven Reffrollen each approximately in the middle of the reef bar, or far enough away from the trigger-side upper edge of the reef bar, allowing it to attack, leaving below the Reffrollen the stretch film accordion-shaped is stored aufgerefft and above the Reffrollen, due to their tensile forces, the stretch film hood over a not too small stretch smoothly on the extended area of the reefing rests. Such, larger sizing of the reef bar is undesirable. It leads to additional Construction costs, in particular to a larger overall height of the facilities and increased before especially the way, in the vertical direction of the reefing brackets or holding them lifting frame must be covered during each packaging process. This is the working speed affects the device, which is of particular importance.

Furthermore, devices have become known in practice, the desired result in the end achieve that the accomplishing the impact on the reef hanger Refresh rolls towards the end of the reefing process translationally to the top edge on the withdrawal side the reef bow are moved. As a result, such a movement causes the Stretch film on the respective reef bow partially smooth pulled or smoothed becomes, so that in the subsequent Querstretchen only some distance from the trigger side At the end of the reef bar form overlap creases. Such, additional movement Refreshing towards the end of the encounter process adds an extra step in the preparation of the stretch film for coating, especially in high-performance systems leads to an intolerable loss of time. It also causes an additional, translational Movement of Reffrollen a corresponding expenditure on equipment, ie costs, and is also an additional source of possible interference. Otherwise, it is not ensured in all circumstances that such a smoothness succeeds.

The invention is therefore based on the object, an apparatus and a method to provide the generic type, the fast and with simple means in the Location is, a stretch wrapping the side surfaces so on the reef bar rinse open, so that the danger that overlap after stretching when removing the film overlap reach into critical areas of the reef bar, is substantially reduced and the film is not pulled or damaged in these areas.

The related to the device part of the object is achieved according to the invention, that every Refforgan has reff facilities with which it is at least temporarily simultaneous act on the stretch film in two zones spaced apart in the direction of refraction can, that between the two zones located stretch film section overlap is arranged on the respective reef bracket. Eventually in the area between Wrinkles reaching the zones become both on impact and peeling off pulled smoothly in this area.

In this way it is ensured that the stretch film at the beginning of Hauptüberziehvorgangs in a certain, not too short range (the "smoothing range" below) be mentioned) before the deduction-side upper edge of the reefing smooth, so without Überlappfalten on the reef ironing lies. All overlap phrases that may be over the course of Coating the stretch film over the charge to be packaged from the accordion-shaped withdrawn kept film stock and then first the relevant Sliding along reef bows are thus at a defined, greater distance from the critical area near the trigger side upper edge of the respective reef bracket, wherein Overlapping should not regularly penetrate into the critical area. So it is ensures that any overlapping crease that does not start immediately when pulling off dissolves the accordion-stretch film stock, first a certain Route must slide along the relevant reef bar before it reaches the critical area reach the relevant reef bracket. In the course of this sliding over a longer The majority of all overlapping crevasses dissolve before the critical area is reached. The risk of interference from thin drawing or tearing of the stretch film, which is particularly precarious when previously formed from the stretch film stretch film hoods are significantly reduced.

Preferably, the two said zones are so far apart that reliably dissolve the overlapping creases. Ie. that overlap only in a few cases between the zones and can reach the critical area. This effect is advantageously both when the film meets the reefing bow also achieved when removing the film of the same.

Preferably, the Refforgane are equipped so that each Refforgan two drivable, has refraction devices arranged behind one another in relation to the direction of impact, preferably rolls, namely a first refresh roll and a second, behind it arranged train roller are formed whose distance from each other advantageously is adjustable.

Even if the device is designed so that the two roles of each Refforgans (during operation of the device) on its periphery coming into contact with the stretch film Turning at approximately the same peripheral speed results in a relatively good result with very little effort. Preferably, however, the device becomes designed so that the Refrefolle, ie the role to which the slide at the beginning of An encounter first meets with its perimeter coming in contact with the stretch film slower peripheral speed turns than the second, so subsequent train role, so that between the rollers located stretch film section during the arrival pulled or smoothed or wrinkle-free pulled. Such pulling (without appreciable Stretching the film) causes any eventual impact with the hood between the two roles advised wrinkles are reliably pulled apart.

Preferably, the device is designed so that the stretch film during operation of the device at least one place on an imaginary, direct line between the said zones neither with the reef bars nor with the Refforganen in contact comes. In this way, it succeeds particularly effective when arriving and subtracting to smooth wrinkles in the area between the two rolls. Maybe Folds made in this area can easily be pulled apart in such a design be, because the friction of the individual foil layers in the area of the folds is canceled as soon as the relevant fold on the direct line connecting the said zones neither with the reef bars nor with the Refforganen in contact comes. Any force that acts perpendicular to the fold and the fold frictionally is held together is lifted.

Here, a design of the device of the type is particularly preferable in which one of Both roles in the operation of the device, the stretch film against a resilient Area of the relevant reef hanger presses. This way becomes a special one effective interaction of both roles in their effect ensured and on everyone Case, an overload of the film in the area between the two rollers avoided. Because in the area of the roller pressing against the elastically resilient area can (if necessary) Slip between the film and the role occur. Preferably, the spring force of elastically resilient range adjustable so that can be tuned exactly when Slippage occurs.

It is favorable to profile at least one of the two rollers, preferably the tension roller, in such a way that that when rolling on the stretch film is not consistent with the stretch film in contact. This favors the pulling apart of the impact in the area between the roles of advised wrinkles. The same applies to an elastic cross profile.

Make the device so that the two rollers of each Refforgans in operation the device are driven by a single motor, then arises a particularly low construction cost. It is also advantageous, one of the two roles, in particular the tension roller, with a freewheel, which a free rotation in the withdrawal direction allows to ensure the unimpeded withdrawal of the film from the reefing bars to ensure. But it is also conceivable that separate drive motors for the roles are provided which accelerated or delayed by individual control Allow rotation of the rollers to z. B. to achieve a braking effect.

Even more, the device can be simplified if you only meet the Pull roll positive, d. H. motor, drives and the Refrefolle during operation of the device drives negative, d. H. slows. Even then, a tension arises between these two rollers, the wrinkles that have occurred in the area between the two rollers reliably pulls apart.

Furthermore, it is conceivable for the roles each have their own, independently of each other operable motor drive and / or independently operable Zustellorgane provided. The preference is nevertheless the following in the figures for the concrete embodiment shown, structurally very simple and extremely reliable To give a solution, which under certain conditions even for retrofitting of existing equipment, since on the piston rod of the delivery device instead of the previous single refresh roll with their engine only the roll tandem are placed thanks to the chain or belt drive, only one unit has to Reffmotor is driven and therefore no fundamental changes in the control the machine requires.

Of particular importance is the invention for packaging machines of the generic type Kind, not only with a strong horizontal stretch, but in addition with a additional, not inconsiderable vertical stretch of about 10% to 50%, in particular also more than 50%, based on the unstretched state in the vertical direction, work. Because when processing stretch films, such a high degree biaxial stress state, it is particularly true of a crack induction to prevent by sliding overlapping creases.

The procedural part of the object is achieved by applying to the stretch film during the impact by the Refforgane each by means of two spaced apart Reef facilities at least temporarily simultaneously in two from each other in Aufreffrichtung spaced zones so acted on the stretch film that after completion the Stretchfolienabschnitt located between the two zones overlap overlap is arranged on the respective reef bracket. When pulling off may be wrinkles also reaching the area between the zones, so that they can not get into the critical area of the upper edge of the reef bar.

Fig. 1

den wesentlichen Ausschnitt der erfindungsgemäßen Vorrichtung, nämlich einen Reffbügel und das ihm zugeordnete Refforgan,

Fig. 2

eine Seitenansicht des wesentlichen Ausschnitts der erfindungsgemäßen Vorrichtung während des Aufreffens der Folie auf die Reffbügel vor deren Querstretchen und

Fig. 3

eine Seitenansicht des wesentlichen Ausschnitts der erfindungsgemäßen Vorrichtung vor dem Abziehen der quergestretchten Folie von den Reffbügeln.

In the following an embodiment of the invention will be explained in more detail with reference to drawings. Show it:

Fig. 1

the essential section of the device according to the invention, namely a reef bar and its associated Refforgan,

Fig. 2

a side view of the essential section of the device according to the invention during the arrival of the film on the reefing before their Querstretchen and

Fig. 3

a side view of the essential section of the device according to the invention before removing the cross-stretched film from the reefbügeln.

The device according to the invention, which is not shown here as a whole, consists in essential from the beginning in connection with the discussion of the state of the Technique mentioned, known basic components that are designed in many ways or can be modified. Numerous other well-known components that go to the complete Carrying out a packaging process of the type in question here required are, come - depending on the individual case - added.

Fig. 1 shows one of usually four - but occasionally more, about six or eight - reef bars 1, as well as this associated with Refforgan 2. The reef bracket 1 is for mounting on a drive, which move him along an arrow S in the horizontal direction back and forth can. The Refforgan 2 consists of a feed device 4, here in the preferred Form of an advantageous manner pneumatically operated feed cylinder, a Reffeinrichtung consisting of a refill 5a and a tension roller 5b, one of the two Rolling driving Reffmotors 3 and an arranging for the required translation chain or belt transmission 6. The feed device 4 can be controlled accordingly and ensures that the refroll 5a and the pull roller 5b moved to their working position and in due course be withdrawn from their working position, respectively by a movement to the left or right along an arrow V. The feed device 4 is usually mounted with its base 7 on the same drive unit, the also the reef bracket 1 along the arrow S back and forth. In this way will ensured by simple means that the Refforgan 2 in a moving apart of the Reffbügel for the purpose of Querstretchens the stretch film together with the reefing 1 is being reduced.

As can be seen with reference to FIG. 2, the reef bow 1 has its discharge side Upper edge of a critical area K. In this critical area K should be during stripping the stretch film of a stretched held stretch film supply 8 only a few, preferably get almost no Überlappfalten. This is because in the critical area K the bow cross section changes greatly. As shown in Fig. 1, for example, tapers the reef bar in the area of constriction 9 locally, while he following in the area of the upper bracket portion 10 then even more strongly expands the film. Slides the film this Area K along, so their load changes in rapid succession. Because of that If possible, overlapping creases should not reach this area otherwise under the influence of this rapid load change the risk of film thinning or Increase cracks. The critical range K is the common one used in practice Facilities in the area of the upper edge of the reef bar. Alternatively, however, is the use from top to bottom almost smooth reefing without significant cross-sectional changes conceivable, with such reefbügeln then it only to prevent that Überlappfalten "jump off" of the reef bars.

At the beginning of each encounter, the Refforgane have returned along the arrow V, so that a noticeable gap between the respective reef bow 1 and the rollers 5a and 5b. The reef bar 1 and the other reef bars (not shown) become one short distance into the usually opened by additional aids stretch film tube introduced, preferably approximately so far, that the lower edge of the Stretchfolienschlauchs a held on reefing 1, free-running roller 11 just covered. On reason the relatively short required ways are the reef hanger so pretty fast in the stretch film tube to position.

Then the Refforgane are delivered, leaving the stretch film between the free-running Roller 11 and the refroll 5a is frictionally held. Then the reef motor 3 started, whereupon the stretch film by the frictional contact with the refroll 5a on the reefing 1, pulled down. A short time later, the lower end of the Stretch film tube also frictionally detected by the downstream tension roller 5b. On the stretch film thus acts on a first contact zone (zone Z1), the refresher 5a and via a second contact zone (zone Z2) the pull roller 5b. Because the two roles together connecting chain or belt transmission 6 designed in this embodiment is that the downstream traction roller 5b rotates faster than the refining roller 5a, the Foil, which is located between the two rollers 5a and 5b, in the area between the Contact zones (Z1 and Z2) pulled tight and depending on the difference in the rotational speeds the two rollers 5a and 5b even temporarily by a certain amount stretched.

As shown by Figs. 1 and 2, the lower pull roller 5b is supported in its operating position advantageously not directly to a substantially rigid portion of the reef bar 10 but rather interacts with a bracket 12, which in the horizontal direction seen secured by a screw 14 and held by a screw 13 Compression spring in the horizontal direction insofar spring-loaded, that a pressure of the Ironing 12 is realized to the tension roller. Instead of such, preferably floating Storage, the bracket 12 may also be mounted resiliently pivotable. It limits the Bracket 12, the force that can apply the pull roller 5b on the film. So too limits the frictional forces that can apply the pull roller 5b on the film. Before it too an overload of the film on arrival between the slower-running refroll 5a and the faster-running pull roller 5b comes, so is slip between the film and the tension roller 5b occur. Advantageously, the spring force with which the bracket 12 is held is, adjustable, which is not shown here.

In particular, when encountering stretch film hoods formed from stretch film hoses it is unavoidable that occasionally film folds the refill 5a during Pass the incident and get into the area between the two rollers 5a and 5b. There they will, due to the fact that there by the faster running downstream Pull roller 5b a train is applied to the film and these folds in the area between the free-running roller 11 and the bracket 12, the contact with the reef bracket lose, effectively pulled apart.

A helpful contribution to the elimination of wrinkles or to improve the smoothing also provides the profile of the pull roller 5b. This profile consists of individual, in the circumferential direction elastic studs 17, between which there are each far distances (profile gaps). In this way, a rapidly increasing and decreasing tensile load applied to the film located between the two rollers 5a and 5b, the the result is optimized.

Due to this embodiment of the Refforgans with at least two, along the vertical axis of Reffbügels 1, so in Aufreffrichtung successively arranged rollers 5a and 5b is ensured at the completion of the refeeding process, that between the critical area K and a region shown in Fig. 2 ZH, in which the film supply 8 accordion-like is located, is not only a marginally far extending area G, in which The stretch film is kept practically smooth. The boundaries of the area G in Aufreff- and Draw direction mark the zones Z1 and Z2, d. H. the zones where the refining roller 5a the film against the free-running roller 11, and the pull roller 5 b, the film against the bracket 12th Press and come into frictional contact with the film.

The vertical extent of the region G that is actually required in the individual case can be determined by the person skilled in the art each easily determine. It hangs beside those of the device and those of the used foils given parameters (coefficient of friction between Reffbügel and film, between film and film, coating speed of the stretch film over the Cargo, concrete geometry of the reef bar, degree of horizontal and possibly vertical Stretchs, etc.) of the desired reliability, d. H. from the degree of security, with which the skilled person wants to prevent overlapping creases in the critical area K reach. As a rule, there is an optimal compromise between the required Compactness of the reef bow on the one hand and a sufficiently reliable avoidance of Overlap creases in the critical region K on the other hand. Preferably, the area is located G between the critical area K and the area ZH in which the film supply 8 accordion-like is aufgerefft. To set the range G or the range ZH, can the bracket 12 in its altitude, d. H. in vertical direction, adjustable on the reef bar 1, while additionally / or alternatively, the distance of the rollers 5a, 5b adjustable can be.

The result described above can also be achieved in certain circumstances be that the pull roller 5b, for example, is pivotally mounted and only shortly before Completion of Reffvorganges is separately delivered so that it interacts with the refroll 5a. However, the preferred solution is as preferred Embodiment illustrative figures shown. Because with such an execution The construction effort is kept low and also reduces the risk of error, which is approximately by the fact that it by the subsequent delivery of the tension roller 5 b under unfavorable Circumstances can lead to an unwanted foil rope or the like.

The rollers 5a and 5b must also be seen in Aufreffrichtung not absolutely accurate with each other lie. A certain, not significantly disturbing lateral offset between the two rollers 5a and 5b is allowed.

As further shown with reference to Fig. 3, after being impacted with the reefing bars loosely laid film first as a result of a to the required width in Dependence of the goods to be packed carried apart of the reefing bracket as well Refforgane stretched in a substantially horizontal direction. The by the divergence resulting tensile force of now in a substantially horizontal direction The stretched film causes it to be in the range ZH of the during the Aufreffvorganges loosely laid stretch film supply 8 superimposed overlap creases 18 under a considerable tension in the ZH area, put it close to the reef stirrups.

During the vertical movement of the entire device during the coating process the stretch film over the charge to be packaged peeling process of the reef bar is due to the described and shown in Fig. 1 advantageous Design of the device ensures that the stretch film at the beginning of the coating process smooth in the smoothing area in front of the discharge-side upper edge of the reefing bow 1, that is without Überlappfalten on the reef ironing lies. All overlapping columns that may be in the Passing the stretch film over the cargo to be packaged from the accordion-shaped kept reefed, under considerable tension foil supply 8 are deducted and then first glide along the respective reef bracket 1, lie in the defined, greater distance from the critical region K near the abzugsseitigen upper edge of the respective reefer bracket 1, wherein Überlappfalten advantageously usually not penetrate into the critical area. So it is guaranteed that each one Overlapping, which is not anyway immediately when pulling off the accordion-shaped aufauffften stretch film stock 8 dissolves, only a certain distance on the relevant The reef bar must slide along before it reaches the critical area K of the relevant reef bar 1 can reach. In the course of this sliding over this distance between the zones Z1 and Z2 dissolves most of all overlapping crevices in area G before the critical range K is reached. The risk of interference from thin drawing or tearing the stretch film, which is particularly precarious when stretch film previously stretch film hoods are formed, thereby significantly reduced.

During the peeling process, the tension roller 5b continues to support in its operating position on the viewed in the horizontal direction floating bracket 12 from so the smoothing effect in the area G between zones Z1 and Z2 also during the stripping process continue to maintain. In this case, the lower tension roller 5b is supported in its Operating position advantageously on a bracket 12 from, in the horizontal direction seen secured by the screw 14 and held by a screw 13 Compression spring in the horizontal direction insofar spring-loaded, that a pressure of the bracket 12 is realized to the tension roller. As already stated, the bracket can instead of such, preferably floating bearing be mounted spring-hinged.

In particular, a film jam in the area G between the zones Z 1 and Z 2 during the peeling of the film due to the divergent peripheral speeds of the two To avoid rollers 5a and 5b, it is advantageous to the storage or the drive of the Traction roller 5b to be designed so that they over during the Aufreffvorgangs accordingly the Reffmotor 3 can be driven in Aufreffrichtung to the difference in the peripheral speeds to ensure the two rollers 5a and 5b and thus the desired smoothing in Area G to reach, the storage or the drive of the tension roller 5b, however, in addition is equipped with a freewheel, which the running of the pull roller 5b with the film in Pulling direction during the removal process allows. During the removal process Accordingly, the refining roller 5a and the tension roller 5b have almost the same peripheral speed on. A particularly low-friction, elaborately designed freewheel is not here necessary, since the frictional forces of the pull roller 5b or the freewheel rather desired are, because of this a certain, albeit slight braking effect on the film is exercised, which in turn the desired smoothing effect now during the removal process entails. Alternatively, it would also be conceivable, the free-running pull roller accordingly slow down in a device equipped with two drives those to drive the tension roller at a lower speed, so that also the desired Effect occurs.

Claims (17)

Device for wrapping preferably palletized piece goods with a tubular or dome - shaped stretch film (15), with reef bars (1) and reflectors (2), by means of which the film section forming the side surface wrapping is picked up on the reef bows (1), the reef bows (1) in horizontal direction (S) are moved to stretch the stretch film (15) after the cross-stretchen stretch, and the reefing brackets (1) in the vertical direction (W) can be moved to pull the stretch film (15) over the piece goods to be packaged , preferably so that the stretch film (15) is stretched longitudinally, characterized in that each Refforgan (2) Reffeinrichtungen (5a, 5b), with which it at least temporarily simultaneously in two spaced apart in the refraction zones (Z1, Z2) on the stretch film (15) can act so that the stretch film section (16) located between the two zones (Z1, Z2) without overlapping on the relevant Ref fbügel (1) is arranged. Apparatus according to claim 1, characterized in that the zones (Z1, Z2) in the refraction so far (G) are spaced from each other that when covering the stretch film (15) the respective reef bracket (1) along sliding film overlaps are reliably pulled apart before the reach critical area (K) of the relevant reef bar. Device according to at least one of the preceding claims, characterized in that each Refforgan (2) comprises at least a first Refrefolle (5a) and a reference to the Aufreffrichtung subsequently arranged second pull roller (5b). Apparatus according to claim 3, characterized in that the distance between the refroll (5a) and the tension roller (5b) is adjustable. Device according to at least one of the preceding claims, characterized in that the refining roller (5a) has a lower circumferential speed than the tension roller (5b) on its circumference which comes into contact with the stretch film during the impact operation of the device, so that the between the refining roller (5a) and the pull roll (5b) located stretch film section (16) is pulled, preferably stretched. Device according to one of the preceding claims, characterized in that during Aufreffbetrieb the device, a stretch film section (16) is provided in which the stretch film (15) spans the portion of the reef bracket (1) between the zones (Z1, Z2) without contact. Device according to one of the preceding claims, characterized in that for at least one of the two rollers (5a, 5b) as a counter-pressure device, an elastically resilient region (12) of the respective reefer bracket (1) is provided. Apparatus according to claim 7, characterized in that the spring force of the elastically resilient region (12) is adjustable. Device according to one of claims 7 to 8, characterized in that the elastic region (12) is adjustable with respect to the Aufreffrichtung. Device according to one of the preceding claims, characterized in that at least the tension roller (5b) is profiled, so that it is not continuously in contact with the stretch film during its rolling on the stretch film. Device according to one of the preceding claims, characterized in that the profiled tension roller (5b) has a cross-roller profile, whose individual lugs (17) are resiliently formed in the circumferential direction. Device according to one of the preceding claims, characterized in that a uniform reef motor (3) is provided for driving the refresher roller (5a) and the tension roller (5b). Apparatus according to claim 12, characterized in that the tension roller (5b) has a freewheel counter to the Aufreffrichtung. Device according to one of the preceding claims, characterized in that both the refroll (5a) and the tension roller (5b) are each equipped with their own drive device. Apparatus according to claim 14, characterized in that the device is designed so that the refresher roller (5a) during Aufreffbetrieb the device relative to the tension roller (5b) is driven in a delayed manner. Method for wrapping preferably palletized piece goods with a tubular or hood-shaped stretch film (15) with the following method steps: the stretch film is at least partially auffuerfft on reefing bracket (1) that they there forms a concertina-like fold stock (8), the stretched stretch film (15) is transversely stretched, the stretched and transversely stretched stretch film (15) is pulled over the piece goods to be packaged in such a way that it envelops at least the side surfaces of the piece goods to be packaged, this tension being caused by the previous transverse stretch and preferably by an additional vertical stretch, characterized in that on the stretch film (15) during the impact by the Refforgane (2) each by means of two spaced-apart Reffeinrichtungen (5a, 5b) at least temporarily simultaneously in two spaced apart Aufreffrichtung zones (Z1, Z2) on the stretch film ( 15) is acted upon, so that the stretch film section (16) located after completion of the impact between the two zones (Z1, Z2) is arranged without overlapping on the relevant reefing bar (1). A method according to claim 16, characterized in that the Refforgane Refforgane used in the method according to any one of claims 1 to 15.

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