EP0294820B1 - Packaging method and apparatus for compressed bales - Google Patents

Packaging method and apparatus for compressed bales Download PDF

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Publication number
EP0294820B1
EP0294820B1 EP88109245A EP88109245A EP0294820B1 EP 0294820 B1 EP0294820 B1 EP 0294820B1 EP 88109245 A EP88109245 A EP 88109245A EP 88109245 A EP88109245 A EP 88109245A EP 0294820 B1 EP0294820 B1 EP 0294820B1
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EP
European Patent Office
Prior art keywords
bale
welding
web
packing
separating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88109245A
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German (de)
French (fr)
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EP0294820A1 (en
Inventor
Jürgen Lang
Herwig Hirschek
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Autefa Maschinenfabrik GmbH
Original Assignee
Autefa Maschinenfabrik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE3719274 priority Critical
Priority to DE3719274 priority
Application filed by Autefa Maschinenfabrik GmbH filed Critical Autefa Maschinenfabrik GmbH
Publication of EP0294820A1 publication Critical patent/EP0294820A1/en
Application granted granted Critical
Publication of EP0294820B1 publication Critical patent/EP0294820B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B9/00Presses specially adapted for particular purposes
    • B30B9/30Presses specially adapted for particular purposes for baling; Compression boxes therefor
    • B30B9/3003Details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B30PRESSES
    • B30BPRESSES IN GENERAL
    • B30B9/00Presses specially adapted for particular purposes
    • B30B9/30Presses specially adapted for particular purposes for baling; Compression boxes therefor
    • B30B9/3003Details
    • B30B9/301Feed means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B27/00Bundling particular articles presenting special problems using string, wire, or narrow tape or band; Baling fibrous material, e.g. peat, not otherwise provided for
    • B65B27/12Baling or bundling compressible fibrous material, e.g. peat
    • B65B27/125Baling or bundling compressible fibrous material, e.g. peat and wrapping or bagging
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65BMACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B9/00Enclosing successive articles, or quantities of material, e.g. liquids or semiliquids, in flat, folded, or tubular webs of flexible sheet material; Subdividing filled flexible tubes to form packages
    • B65B9/02Enclosing successive articles, or quantities of material between opposed webs
    • B65B9/026Enclosing successive articles, or quantities of material between opposed webs the webs forming a curtain
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S53/00Package making
    • Y10S53/02High frequency electric sealing

Description

  • The invention relates to a method and a device for packaging pressed bales, in particular fiber bales, with the features in the preamble of the main method and device claim.
  • Such a device is known from DE-OS 29 11 958. Here the finished pressed bale is wrapped with a jacket sheet in the form of a foil bandage. This is done by means of a complicated swivel lever which grips the bale on the side and which carries a coil with the jacket film. The free end of the film is held on the opposite side by a swiveling clamping finger. The arrangement is movably supported on a carriage and is moved toward the bale to encase the bale, the pivot arm simultaneously executing a closing movement.
    The known arrangement has the disadvantage that it cannot work fully automatically, since after the wrapping has been set, the device must be moved back from the bale with the swivel arm open and only then can the free web end of the coil be reconnected to the tensioning finger. The publication does not give an indication of how this should be done automatically. A further disadvantage is the fact that the casing sheet cannot be placed around the bale without wrinkles and also has different tension states over the circumference of the bale. This presupposes the use of elastic, stretchable films, which, however, are not the optimal material for bale packaging. There is also a strapping of the wrapped bale only possible when the packaging device has returned to its original position. The strapping must therefore be carried out in an additional operation. In view of the resulting space requirement, the practical feasibility of this packaging device in a pre-pressing station and its constricting support structure seems more than questionable. Overall, the previously known construction is very complex with inadequate operational reliability and unfavorable cycle times.
  • From DE-OS 29 48 237 a baling system is known, in which the packaging and strapping must take place in separate stations outside of the finishing press station. For the wrapping of the bale, a movable film carrier with two coils is provided, which places the jacket film in a U-shaped path around the bale. For this purpose, however, an additional and very complicated press ram system is necessary, with which the pressed bale is held on a carousel table and rotated from station to station with the latter. For finished presses with high pressures, this arrangement cannot be realized without considerable loss of density in the bale. In addition, the arrangement is also very complex due to the different stations and requires a high cycle time.
  • It is therefore an object of the present invention to provide a possibility for packaging and strapping a bale in the finishing press station, which allows the wrapping sheet to be placed around the bale in a wrinkle-free and tight manner and to carry out the packaging in the shortest possible time.
  • The invention solves this problem with the features in the characterizing part of the main claim. With the method according to the invention and the associated device, the jacket sheet can be pulled smoothly, symmetrically and quickly wrap, cut and seal around the bale. It then sits wrinkle-free and has no irregular internal tension. Due to the arrangement in the finishing press station, the wrapping can take place very quickly. The device according to the invention can also be retrofitted to existing finished press stations because of its small space requirement. This is even possible with carousel presses, which additionally restrict the available space due to their support structures. The previously known designs can either not be realized at all with carousel presses or can only be realized outside the finishing press station.
  • When strapping the bale, the strapping is preferably placed at the same time. This saves a considerable amount of cycle time and also secures the seat of the jacket sheet. In this way, non-stretchable packaging materials, for example so-called ribbon fabrics, can also be used without further ado.
  • In the preferred packaging device, the separating and welding device can be designed differently, for example as a simple hot wire arrangement with a cutting knife, as a beading belt arrangement or the like. These devices are primarily intended for stretchable and shrinkable films, which, however, are less suitable for packaging bales.
  • For stretch-resistant materials, such as ribbon fabrics, thermal welding devices are less suitable for various reasons. This is due, on the one hand, to the width of the devices, which necessitates a certain distance between the weld seam and the bale. This distance, which is expressed in lots, can only be compensated for by stretchable and shrinkable foils, but not by stretchable materials. The other is Strength of a weld seam created with thermal welding devices in tissues is not sufficiently high. However, for reasons of strength, the fabrics are the preferred packaging material, which so far has only been used in the form of sewn and stacked sacks or can be folded around the bale as a cloth.
  • The preferred packaging device not only enables the bale to be wrapped with this tissue, but also to ensure that it is welded securely and quickly, the weld seam also being able to be placed in the immediate vicinity of the bale. However, the ultrasonic welding process and the associated device can also be used successfully in conjunction with other packaging devices. They also allow spot or line welding of the jacket sheet to the cover and bottom film in the overlap area. The arrangement of the lid and base parts is otherwise not absolutely necessary. The cover sheet can also be wrapped around a bare bale.
  • Depending on the design of the welding head, the ultrasonic welding device can only weld the two fabric or film webs, an additional device, for example a cutting knife or the like, being used for the separation. However, if the welding head has a cutting edge and beveled lateral flanks, the overlapped fabric or film webs can be severed in one go and the open web ends can be welded on both sides at the same time. A flank angle between 140 and 150 ° has been found to be favorable for the special application area of ribbon fabrics. In addition, any other packaging materials, in particular stretch films, can also be processed with the ultrasonic welding device. This may require a change and optimization of the flank angle.
  • The ultrasonic welding machine does not develop as high temperatures at the welding point as other thermal welding machines. It is thus possible to close the jacket sheet tightly around the end of the bale with a tensioning device and to arrange the welding point very close to the bale. In this way, on the one hand, a stretch-proof fabric can be wrapped around the bale without loosely, which is also possible with bales made of easily combustible or otherwise heat-sensitive material. In connection with the simultaneous wrapping and strapping of the bale, there is the additional advantage that the casing web is relieved at the end of the bale, so that there is only low tensile stress at the welding point.
  • The packaging method according to the invention and the associated device also allow a faster removal of the finished bale from the press and thus a further reduction in the cycle time. For this purpose, a removal device connected to the packaging device is provided. Due to the double coil arrangement, the wrapped bale is freely accessible and can be removed after the tissue or film webs have been separated and welded. A previous retraction of the packaging and / or strapping device as in the prior art is therefore unnecessary. The bale that has been removed can be immediately unloaded onto a corresponding stationary conveying device. However, it is also possible to use the packaging device to move the removed bale back out of the now free press and to transport it further to a more distant unloading point.
  • For a quick and easy removal, the use of a loading fork that is pivoted and movable is recommended. After the fork tines have been retracted into the channels provided for this purpose in the lower ram the bale is removed and loaded by a simple tilting movement. If the removal device is equipped with a chain conveyor or other conveying element with a greater overall height than the fork tines, the bale can be placed on it at the end of the swiveling movement and transported immediately.
  • Further advantageous refinements of the invention are specified in the subclaims.
  • The invention is shown schematically and by way of example in the drawings. Show in detail
  • 1 to 7
    a perspective view of a baler with an associated packaging device in its various movement sections,
    Fig. 8
    2 shows a plan view of a packaging device according to FIGS. 1 to 7,
    9 to 11
    a carousel baler with a packaging device in different views,
    Fig. 12
    a separating and welding device in an enlarged view.
    Fig. 13 to 17
    a cutting and welding device with an ultrasonic welding device in different, partially enlarged views and
    Fig. 18 to 21
    a removal device for the bale in various variations and representations, and a schematic functional sequence.
  • The drawings show a baler (1) or a multi-part baling system for pre-pressing and finishing pressing bales (14) made of fiber material, which are provided with a wrapping and strapping by a packaging device (8). The embodiment of FIGS. 1 to 7 shows a baling system (1) with a press carriage (4) which can be moved on rails and which carries a press box (5) for receiving the bales (14). The embodiment of FIGS. 9 to 11, on the other hand, shows a baler (1) in the form of a carousel press, in which the press boxes (5) are transported from the pre-press station (2) to the finished press station (3) via a swiveling carousel (4). The details of the carousel press are designed in accordance with DE-GM 79 07 579.
  • In both cases, fiber or other bale material is filled in a pre-pressing station (5) in a pre-pressing station (2) and pre-compressed with a relatively low pressing force of approx. 25 t. The press box (5) has retractable hold-down devices that prevent the material to be pressed from swelling after pressure relief. The press box (5) is then brought from the press carriage or carousel (4) into the finishing press station (3), in which the bale (14) is compacted in the press box (5) and, after the press box (5) has been removed, is pressed at high pressure. In this position, as shown in Fig. 4 and 10, the packaging of the bale (14) takes place, which is clamped between the press rams (6,7) under high pressure.
  • For this purpose, the packaging device (8) has a film or fabric carrier (9), a strapping device (12) and a separating and welding device (13), which are in a common housing or trolley (47, 48), (see FIG. 18 to 21) and are guided on rails (26) or the like in a hanging or floor-mounted manner relative to the finishing press station (3). To be packed before Finished pressing between the press rams (6, 7) and the bale (14), a bottom (18) and a lid (16) are introduced, which are pressed onto the bale (14) at the top and bottom during the finishing press. In this position, they are wrapped laterally with the bale by a jacket sheet (15) and surrounded and fixed with tires. Bottom (18) and lid (16) can consist of different solid or flexible materials, for example foils or fabrics. The following is generalization of foils. In a variation, it is also possible to lay a jacket sheet (15) without bottom and cover parts (18, 16).
  • The course of the packaging process and the details of the packaging device are explained in more detail with reference to FIGS. 1 to 7:
    In Fig. 1, a bale is being prepared in the pre-pressing station (2), while the finishing press station (3) is empty. The press box (5) is open at the front and closed for pre-pressing on the underside by a sliding floor in the press carriage (4).
  • In the path of movement of the press carriage (4) a winding device (17) is arranged in front of the finishing press station (3) approximately at the level of the raised, upper press ram (6), a piece of cover film (16) of which is inserted into the path of movement of the press box (5) that later forms the upper end of the bale wrapper. A similar base film (18) is placed on the lower press ram (7) and is held in this position by a clamping device (31). The area of both foils is larger than that of the press rams (6,7) and later lies against them with edges that protrude from all sides. The packaging device (8) can be moved in alignment in the longitudinal direction with the press wagon train. In Fig. 1, the packaging device (8) is in the rest position outside the finishing press station (3).
  • After the pre-pressing, the pressing carriage (4) with the pressing box (5) and the bale (14) is moved into the finishing press station (3) according to FIG. 2. The press box (5) takes the cover film (16) with it and strips it under the upper press ram (6). After the hold-down device and the sliding floor are extended, the press box (5) is accessible from the front and the press ram (6) is lowered. The press punches (6, 7) clamp the bales (14) between them under high pressure with the interposition of the overlapping foils (16, 18). The cover film (16) has previously been separated from the winding (17).
  • 3 and 4 show the finished press position in which the bale (14) in the press box (5) is compressed to such an extent that the press box (5) can be opened again and pulled off with the press carriage (4). 9 to 11, the press box (5) is pulled off the bale (14) overhead.
  • At the end, the finished wrapping should tightly enclose the bale (14) on all sides. For this purpose, the overlapping edges of the foils (16, 18) are folded and held under air pressure or by pins arranged between the channels (30) of the press rams (6, 7) in contact with the bales (14). The pins are actuated and extended, for example, by hydraulic or pneumatic actuating cylinders.
  • The packaging device (8) is then moved from its ready position onto the bale (14). Fig. 8 illustrates this process better. The film or fabric carrier (9) has two vertical coils (10, 11), which are spaced apart from each other by a little more than the bale width and span the jacket web (15) between them in the form of a closed film or fabric surface. The fabric or film webs are in opposite directions wound on the coils (10,11) and are tightened by a tensioning device. The winding direction is such that the film or fabric surface is in the feed direction of the packaging device (8) behind the coils (10, 11).
  • For packaging, the device (8) is moved in the direction of the arrow from the position shown in dashed lines opposite the bale (14). The jacket sheet (15) lies against the back of the bale, so that in the further movement the jacket sheet (15) is placed in a U-shape around the bale (14). Behind the front end of the bale, the jacket (15) wrapped around the bale (14) is separated from the coil webs at the center of the bale in the separating and welding device (13), both ends of which are welded together again, thereby closing the bale wrapper. At the same time, the cut-off coil web ends are welded together again, so that the film or fabric surface between the coils (10, 11) is closed again.
  • Fig. 12 illustrates the details of the separating and welding device, which consists of two jaws (23) movable transversely to the direction of movement. During the wrapping of the bale (14), the two jaws are spaced far apart and are moved towards each other again after reaching the end of the bale. One jaw (23) carries a separating element (24) approximately in the middle in the form of a protruding heating wire or a knife with which the two sheets of film or fabric are severed. On both sides of the separating element (24) heating wires (25) are arranged on one jaw, which weld the cut web ends to each other and for this purpose cooperate with Teflon surfaces on the other jaw.
  • The separating and welding device (13) can also be designed as a heated beading band with a similar construction as in FIG. 12. The beading band has a heating band with the said central bead (24), which extends over the entire width of the jaw (23). The beading tape is covered on both sides of the bead (24) by a Teflon tape over the entire surface opposite the jacket sheet (15). A silicone rubber layer is arranged on the opposite jaw (23) and is also fully protected by a Teflon tape. To separate the fabric or film webs, the bead (24) on the opposite side can be slightly pressed into the silicone rubber layer. As a result, the heating foils on both sides also come into full contact with the jacket sheet (15) and ensure a sufficiently firm weld.
  • For wrapping the bale (14), the packaging device (8) is moved forward in cycles, with a step size that corresponds to the distance between the channels (30) in the press rams (6, 7). The strapping device (12) is thus moved step by step from channel to channel and in each cycle puts a tire through the channels around the bale and the casing web (15) which has already been drawn up. The strapping device (12) has one or two strapping heads (21) with corresponding deflection tracks (22) on the other side of the bale. The packaging device (8) is moved via a low-play actuator which is driven by a stepper motor with programmable control. This drive is described with its details in DE-OS 34 32 832.
  • As illustrated in FIG. 8, the film or fabric carrier (9), the separating and welding device (13) and the strapping device (12) are arranged one behind the other in the packaging device (8). The distance between the strapping device (12) and the separating and welding device (13) is based on the distance between the channels (30) matched from the edge of the bale or press stamp. As a result, the last strapping can be placed in one operation and the jacket web (15) can be closed.
  • 5 shows the packaging device (8) in this last working position corresponding to FIG. 8. According to FIG. 6, the packaging device (8) moves a little further and releases the finishing press station (3). After lifting the upper press ram (6), the fully wrapped and strapped bale (14) can be removed and transported away. This can be done by an external removal device or by a removal device (49) carried along according to the embodiment of FIGS. 18 to 21. In both cases, the packaging device (8) travels through the empty finished press station (3) back to its starting position on the other side for the next packaging process (cf. FIG. 7).
  • In the exemplary embodiment of FIGS. 1 to 7, a wrapping device (19) is pivotably mounted on the packaging device for introducing the bottom film (18), which takes up a vertical position during the packaging process. As soon as this is finished, swings according to Fig. 5, the winding device (19) in a horizontal position and unwraps a piece of the bottom film (18) (see. Fig. 6). When returning to the starting position, the hanging bottom film (18) is held by the clamping device (31), unwound and placed over the lower press ram (7). Fig. 7 illustrates this position, in which the cover film (16) is unwound for the next packaging process. After separating the bottom film (18), the winding device (19) is rotated back into its vertical position, so that the packaging device (8) for the next packaging process. Fig. 1 is ready.
  • The embodiment of Figures 9 to 11 shows a baler (1) in the form of a carousel press, in which the press boxes with the bale (14) are rotated via a rotatable carousel (4) from the pre-pressing station (2) into the finishing press station (3). The packaging device (8) is mounted with its guide rails (26) within the press frame. By arranging its parts in rows, it can be moved back over the side post (28) of the press frame, in front of which only the stretched fabric or film web then extends. The press area is therefore fully accessible from the side. On the other hand, the packaging device (8) can travel as far as over the center column (27) of the carousel press, the stretched film or fabric sheet resiliently wrapping around the center column (27) after separation and welding and being tightened again when reversing. In this end position, too, the press area is fully accessible from the side, so that the fully packed bale can be removed. With this design and storage, the packaging device (8) can be retrofitted to any existing carousel press without having to convert press parts, conveying devices or the like at great expense.
  • The lid and bottom film (16, 18) can also be inserted in the carousel press in a manner similar to that in the exemplary embodiment in FIGS. 1 to 7. For this purpose, the winding device (17) is only arranged in front of the upper press ram (6) in the swivel area of the carousel (4).
  • 10 and 11 show a further possibility for introducing the lid and bottom, which in turn can also be used in a sliding press according to FIGS. 1 to 7. In addition to the finishing press (3), a gripping device (20) is movably arranged, which has pivotable laying arms (29) with separating devices, which the cover and Bottom film (16, 18) from coils (17, 19) is fed. After the last bale (14) has been ejected and the transport device (8) has withdrawn, the gripping device (20) moves into the press area from the side and, with its pivoted-out laying arms (29), holds the films (16, 18) that have already been separated off or under the press ram (6,7). The laying arms (29) are fork-shaped and stretch the foils (16, 18) between them.
  • First, the bottom film (18) is placed on the empty lower press ram (7) and held in place by clamping means or the like. Then the removed press box (5) lowers again and the carousel (4) swivels through 180 °. The empty press box (5) with the inserted base sheet (18) is then filled and pre-compacted in the pre-pressing station (2), while a pre-pressed bale (14) with already inserted base sheet (18) arrives in the pre-pressing station (3). The gripping device (20) may have been moved back briefly during the carousel swivel. It is then returned and holds the cover film (16) under the upper press ram (6) with its upper laying arms (29). When it is lowered, it takes the cover film (16) with it and presses it onto the bale (14). The gripping device (20) then moves back into its rest position from the press area. After the final pressing, the press box (5) is pulled off the bale (14) overhead and the packaging process takes place in the manner described above.
  • 13-17 show a variant of the cutting and welding device (13), which is equipped here with an ultrasonic welding device (33) and a clamping device (32).
    The top view of FIG. 13 shows the position of the individual parts of the device before the cutting and welding process begins. The packaging device (8) and the strapping device (12) are on here two trolleys (47, 48), which can be moved synchronously on floor rails on both sides of the bale. In contrast to Fig. 8, which shows a film or fabric carrier (9) that is being unwound on the right-hand side of the coil, in Fig. 13 the jacket web (15) is unwound from the left-hand side of the coils (10, 11) in each case and tensioned ( 43) deflected into a position parallel to the long sides of the bale (14). Fig. 13 illustrates the end position of the packaging device (8), in which the last two straps are placed and in which the U-shaped cover sheet (15) extends a little beyond the end of the bale in the longitudinal direction.
  • The cutting and welding device (13) is in turn arranged between the coils (10, 11) and the strapping device (12). The tensioning device (32) consists of two swivel arms (37, 38) which are rotatably mounted on the trolleys (47, 48) about vertical axes (39, 40). Both swivel arms (37, 38) are angled and swivel together towards the center of the bale, taking along the jacket web (15) running in front of them.
  • As can be seen more clearly in detail from the perspective view of FIG. 14 and the top view of FIGS. 15 and 16, the swivel arm (37) carries at its end the ultrasonic welding device (33) which has a drive (not shown) and a corresponding guide is movably mounted in height. On the swivel arm (37) there is also an angled baffle plate (42) and a pressure roller (41) which is adjustably mounted at the arm end via a spring (46) (see Fig. 15). The swivel arm (38) carries at its free end a knife (44) which has an oblique pressure surface (45), preferably made of hardened steel, as a counter-work surface for the ultrasonic welding device (33). The parts (41, 42 and 44) are longer than the bale height according to FIG. 2 and protrude above its bottom and top surface.
  • 14 - 17 illustrate the separation and welding position. During the retracting movement, the guide plate (42) and the pressure roller (41) arranged on the other side of the ultrasonic welding device (33) take along the jacket sheet (15) on the one side and the knife (44) on the other side and tightly cover them the corners and the rear front of the bale (14). The two webs of fabric or film are brought together by the pointed edges of the knife (44) and the guide plate (42) in the middle of the bale and directly on the surface of the bale, and then overlapped a little along the printing surface (45) at an angle from the bale (14) . Via the spring-loaded pressure roller (41), the two fabric or film webs are pressed against the pressure surface (45) and are brought apart again after they have left.
  • As shown in FIG. 16 in an enlarged view, the ultrasonic welding device (33) with its welding head (34) is preferably oriented at right angles to the pressure surface (45) in the working position. The welding head is also arranged in the immediate vicinity of the edges of the guide plate (42) and the knife (44) near the bale and thus also very close to the surface of the bale. The two fabric or film webs (15) thus only protrude a short distance from the edge of the bale to the point of separation and welding. After the web ends have been severed and welded, the jacket web (15) thus bears against the bale (14) practically without any slack.
  • The welding head (34) consists of a cylindrical shaft, which at the end has a central and vertically oriented cutting edge (35) with lateral oblique flanks (36) (cf. FIG. 17). The two flanks (36) form an obtuse angle with one another, which should be between 140 and 150 ° for ribbon tissue or similar materials. With this flank geometry, the overlapped film or fabric webs (15) are severed in one go, the open web ends being welded on both sides at the same time. The flanks (36) merge into the shaft of the welding head (34) after a bevelled cut. As the side view in the right half of FIG. 17 shows, the cutting edge (35) is convex in the longitudinal direction. At the flanks (36) there is an operating temperature of 90 ° C, while the cutting edge (35) is approximately 140 ° C.
  • In a similar way to the pressure roller (41), the welding head (34) is spring-loaded and is pressed on with constant force. As a result, he can follow humps in the jacket web (15) during his travel movement and also ensure proper separation and welding at these points. This is particularly useful for the slightly irregular ribbon fabric in the surface structure. The resilient mounting of the pressure roller (41), on the other hand, compensates for different bale thicknesses or other irregularities in the end position of the tensioning device (32) and ensures the overlapping position of the fabric or film webs on the printing surface (45).
  • Alternatively, the welding head (34) can also have a flattened end face instead of the cutting edge (35). It then only serves to weld the fabric or film webs. The jacket web (15) is cut off by another device, for example a cutting knife. In addition, the ultrasonic welding device (33) can also have an elongated welding head (34) and be arranged in a stationary manner.
  • In addition, an ultrasonic welding device (33) for tack welding the casing sheet (15) and the cover and base parts (16, 18) can also be provided with a corresponding travel drive.
  • FIGS. 18-20 show the additional arrangement of a removal device (49) on the packaging device (8). 18 and 20 show two different embodiments in plan view, while FIG. 19 shows a section along the line VII-VII of FIG. 18. Fig. 21 illustrates the schematic work flow of the removal device (49).
  • In both exemplary embodiments, the removal device (49) consists of a loading fork (50) with L-shaped prongs (53, 54) which are spaced apart from one another in accordance with the distance between the channels (30) in the lower press ram (7). To pick up the bale (14), the horizontal tines (53) can thus move into said channels (30). The loading fork (50) is rotatably mounted about a horizontal longitudinal pivot axis (51) at the transition between the tines (53, 54). For this purpose, it is mounted on a carriage (52) which can be moved transversely to the direction of travel of the trolley (48). The loading fork (50) with its horizontal tines (53) can move into the channels of the press ram (7) via the slide movement.
  • A chain conveyor (55) is arranged on both sides of the loading fork (50) and has a somewhat greater overall height than the tines (53, 54). The chain conveyor (55) also works transversely to the direction of travel of the trolley (48).
  • In the exemplary embodiments, the removal device (49) is arranged on the one trolley (48) in the immediate vicinity and behind the strapping device (12), in particular the deflection tracks (22). After completion of the bale packaging, ie the wrapping and strapping and the separation and welding of the casing web (15), the packaging device (8) moves a little further until the removal device (49) in front of the upper one Press stamp (6) released bales (14).
  • In the exemplary embodiment in FIG. 20, this travel movement is unnecessary, since here the removal device (49) is arranged to overlap the strapping device (12). The strapping device (12), for reasons of space these should also be the two deflection tracks (22), can be pivoted on the trolley (48) via a vertical axis (39) and, if necessary, is also adjustable in height and can be used to remove the bale (14) can be pivoted into the position shown in dashed lines. For this purpose, the two deflection tracks (22) are connected to one or more brackets (58). The same axis (39) is expediently used for the swivel arm (37) of the tensioning device (32) and the strapping device (12). The fork tines (53) and the deflection tracks (22) are arranged offset to one another. It is also advisable to choose a larger distance for the deflection tracks (22) or strapping heads (2l) than in the other exemplary embodiments. When the last strapping is placed, the fork tines (53) also align with the assigned channels and can therefore retract at the same time as the strapping.
  • 21 illustrates the bale removal in schematic end views from top to bottom.
    For removal, the loading fork (50) first moves under the bales (14) by means of the slide (52). According to the second picture, the loading fork (50) is then rotated about its pivot axis (51), the bale being supported on all tines (53, 54). In this partially tilted position, the fork (50) has already disengaged from the lower ram (7) and the trolleys (47, 48) can move back again.
  • At the end of the pivoting movement according to the third picture, the bale (14) sits on the chain conveyor (55). In the exemplary embodiment in FIG. 20, the chain conveyor (55) can immediately unload the bale (14) onto a stationary conveyor (57), for example a roller conveyor. In this case, the unloading point (56) is within the finishing press station (3). However, the removal device can also travel analogously to the exemplary embodiment in FIG. 18 with the bale loaded from the press. The unloading point (56) is then in the starting position of the trolley (48) outside the finishing press station (3).
  • After delivery of the bale (14), the loading fork (50) swings back into its starting position, the carriage (52) simultaneously moving from its position close to the press back into the starting position shown in the fourth image of FIG. 21. The removal device (49) is now ready again and can be moved forward again with the packaging device (8) when the next packaging process is initiated.

Claims (22)

  1. Process for packing pressed bales, in particular fibre bales, in the finishing press (3) of a bale pressing plant (1), the bales (14) held under pressure between pressure rams (6, 7) and where appropriate provided with base and cover (18, 16), being wrapped and hooped in a casing web (15), the casing web (15) being separated from the coil web and the free web ends being welded again, characterized in that the casing web (15) is tensioned between two coils (10, 11) over the bale width and, in a rectilinear transporting movement, is laid in a U-shape around the bale (14), the two coils (10, 11) being moved on both sides along the tensioned bale (14) and the bale (14) being hooped by a hooping apparatus (12) which directly follows the coils (10, 11) in the finishing press (3) with a transporting movement in the same direction.
  2. Process according to Claim 1, characterized in that separation of the casing web (15) and welding of the free web ends occurs in the middle at the bale end.
  3. Process according to Claim 1, characterized in that the casing web (15) is transported and is laid around the bale (14) in phases, a hooping being laid on after each conveying phase.
  4. Process according to Claim 1 in particular, characterized in that the web ends are welded by ultrasound.
  5. Process according to Claim 4, characterized in that, simultaneously with welding, the casing web (15) is separated by ultrasound.
  6. Process according to Claim 1, 4 or 5, characterized in that the casing web (15) is placed closely against the bale (14) during separating and welding.
  7. Process according to Claim 1 or one of the subsequent claims, characterized in that the bale (14), directly after packing, is removed from the pressure rams (6, 7), loaded onto the packing apparatus (8) and immediately unloaded again onto a conveying apparatus or, together with the packing apparatus (8), moved out of the pressing region and moved to an unloading point.
  8. Apparatus for packing pressed bales, in particular fibre bales, in the finishing press station (3) of a bale pressing plant (1), comprising: an apparatus for wrapping the bale (14), held under pressure between the pressure rams (6, 7), in a casing web (15); a separating and welding apparatus (13); and a hooping apparatus (12), characterized in that the packing apparatus (8) at the finishing press station (3) is mounted to be able to traverse lengthwise of the bale (14) and has a foil or fabric carrier (9) with two coils (10, 11) spaced from one another by the width of the bale and behind which the separating and welding apparatus (13) as well as the hooping apparatus (12) is arranged, the packing apparatus (8) being arranged on two trolleys (47, 48) movable on both sides of and lengthwise of the pressure rams (6, 7).
  9. Apparatus according to Claim 8, characterized in that the spacing between the hooping apparatus (12) and the separating and welding apparatus (13) is matched to the spacing of the channels (30) from the edge of the bale or pressure ram.
  10. Apparatus according to Claim 8, characterized in that there is traversably arranged transversely to the packing apparatus (8) a gripping apparatus (20) for inserting the bases (18) and covers (16).
  11. Apparatus according to Claim 8, characterized in that, in the movement path of the bales (14), a winding apparatus (17) with the cover foil (16) is arranged in stationary manner in the region of the upper pressure ram (6), and in that a winding apparatus (19) with the base foil (18) is pivotally mounted on the packing apparatus (8).
  12. Apparatus according to Claim 8, characterized in that the separating and welding apparatus (13) has two movable jaws (23) which have, on both sides of a separating element (24), hot-wires (25) for welding the foil ends.
  13. Apparatus according to Claim 8, characterized in that the separating and welding apparatus (13) has an ultrasonic welding device (33).
  14. Apparatus according to Claim 13, characterized in that the ultrasonic welding device (33) has a welding head (34) with a vertical cutting edge (35) and lateral sloped flanks (36).
  15. Apparatus according to Claim 14, characterized in that the flanks (36) between them enclose an angle of 140° to 150°.
  16. Apparatus according to Claim 13, 14 or 15, characterized in that the ultrasonic welding device (33) is constructed to be height-adjustable and has a spherically rounded-off cutting edge (35).
  17. Apparatus according to one of Claims 13 to 16, characterized in that the separating and welding apparatus (13) has a clamping apparatus (32) which may be pivoted in and which places the casing web (15) at the weld point closely against the bale (14), clamps it together, overlapping somewhat, guides it obliquely away from the bale, and at the same time supports it.
  18. Apparatus according to Claim 17, characterized in that the clamping apparatus (32) has two pivot arms (37, 38) which are mounted on both sides of the bale (14) so as to be rotatable about vertical axes (39, 40), and whereof one (37) carries the ultrasonic welding device (33), a contact pressure roller (41) as well as a guide plate (42), and the other carries a blade (44) with a slanted pressure surface (45).
  19. Apparatus according to Claim 8, characterized in that at the packing apparatus (8) there is arranged a removal apparatus (49) for the packed and hooped bale (14).
  20. Apparatus according to Claim 19, characterized in that the removal apparatus (49) has a pivotal loading fork (50) with L-shaped prongs (53, 54), which is traversably arranged on a carriage (52).
  21. Apparatus according to Claim 20, characterized in that there is arranged in the region of the fork prongs (53, 54) a chain conveyor (55) which has a greater height than the fork prongs (53, 54).
  22. Apparatus according to Claim 19, 20 or 21, characterized in that the removal apparatus (49) is arranged in the region of the hooping apparatus (12), the hooping apparatus (12) being removably mounted in this region.
EP88109245A 1987-06-10 1988-06-10 Packaging method and apparatus for compressed bales Expired - Lifetime EP0294820B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3719274 1987-06-10
DE3719274 1987-06-10

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EP0294820B1 true EP0294820B1 (en) 1992-04-15

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EP88109245A Expired - Lifetime EP0294820B1 (en) 1987-06-10 1988-06-10 Packaging method and apparatus for compressed bales

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US (1) US5125210A (en)
EP (1) EP0294820B1 (en)
JP (1) JP2857400B2 (en)
ES (1) ES2030790T3 (en)
WO (1) WO1988009748A1 (en)

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Also Published As

Publication number Publication date
JP2857400B2 (en) 1999-02-17
WO1988009748A1 (en) 1988-12-15
US5125210A (en) 1992-06-30
ES2030790T3 (en) 1992-11-16
EP0294820A1 (en) 1988-12-14
JPH01503620A (en) 1989-12-07

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