EP0745047B1 - Process and device for packing pressed bales and packing blank - Google Patents

Abstract

PCT No. PCT/EP95/00563 Sec. 371 Date Aug. 7, 1996 Sec. 102(e) Date Aug. 7, 1996 PCT Filed Feb. 16, 1995 PCT Pub. No. WO95/22490 PCT Pub. Date Aug. 24, 1995The invention relates to a process ad device for packing pressed bales of cut or stranded textile fibers in a bale press with one or more elastic packing blanks which are wrapped and secured around the bales. The packing blanks are overlapped and bonded together at the contact point adhesively or by welding. Use is made for this purpose of multi-layer packing blanks with a retaining structure and, at least locally, a weldable and/or adhesive coating, the coatings of the packing blanks being brought into mutual contact. Bonding is achieved by pressure and/or heat.

Description

The invention relates to a method and a device for packaging pressed bales made of fibrous materials and a packaging blank with the features in the preamble of the independent claims.

Such a packaging method together with packaging device in connection with a baler is known from DE-A-19 51 113. The bale is packed in the baler with two sacks, which are overlapped and overlapped and welded together at the point of overlap. The packaging bags are flexible and have a stretch to absorb the expansion pressure of the goods. If the expansion pressure of the bale becomes too great, the bale is additionally provided with a strapping or strapping which absorbs the forces. The single-layer plastic bags are connected to each other by a welding device on the press box with extendable welding jaws. The overlap point is located on the lower press or lacing plate, which serves as the opposite pole and abutment for the welding process. This type of folding, in which the lower sack is turned backwards, means that the wrapping lies loosely on the bale. The bale should stretch a little when relieved and only then fill and tighten the packaging completely. The point of overlap migrates above and is stressed by the expansion forces on shear. The previously known packaging technology is only suitable for relatively low compression and expansion forces as well as low-density bales without additional strapping and lacing.

Similar processes and devices are also shown in DE-A-40 15 642, DE-A-40 15 643, DE-A-29 11 958 and DE-A-29 48 237. In the cases mentioned, high-density pressed bales are made from fibrous materials , in particular cut or strand-like textile fibers, packed in a baler with one or more resilient packaging blanks and then provided with strapping made of metal or plastic straps. The strapping provides support for the packaging and the bale. In the case of a three-film packaging, the packaging blank provided as a waist bandage is pulled off from a film wrap in the required length and welded with the ends to form a closed ring around the press bale. However, there is only a loose connection between the belly bandage and the packaging blanks acting as a lid or bottom, which is fixed by the strapping.

The strapping has the disadvantage that it complicates the further processing of the bale. The strapping is cut off or otherwise cut with a suitable tool. There is a risk that the bale will be damaged. On the other hand, there is a certain risk of accidents for operators when opening the strapping.

DE-A 41 21 573 teaches a covering for solid bodies, which consists of several layers of wrapping film which are connected to one another by an adhesive layer. The wrapping films are paper or stretch films that cannot withstand any major loads and are unsuitable for the packaging of highly compressed and expanding bales. In addition, the wrapping technique cannot be used with a bale if it is held between two rams during the packaging process.

It is therefore an object of the present invention to show a possibility for better packaging of a bale.

The invention solves this problem with the features in the subordinate method and claims.

With the method according to the invention, the baling of the press bale can be dispensed with. Instead, the packaging blanks are wrapped around the bale with mutual overlap and connected to one another by gluing and / or fusing. The packaging is fixed in place by the adhesive and / or melt connection of the various packaging blanks.

The method according to the invention is suitable for different types of packaging. In practice, two or three packaging blanks are used, which are folded in a suitable manner around the bale. However, it is also possible to work with a single packaging blank in the form of a bag or tube and to close the open ends by folding and gluing and / or fusing.

The method according to the invention is particularly suitable for the packaging of press bales in balers, in which the press bale is held under high pressure between two press rams during the packaging process. The press bale preferably consists of fibrous materials, in particular cut or strand-like textile fibers, which are also known as staple fibers or Tow are referred to. Otherwise, the baling can also consist of a different material.

The packaging blanks are tensile and stretch-resistant and have a support insert, preferably in the form of a fabric, and a meltable and / or adhesive coating. The use of multilayer packaging blanks that consist of at least two layers is particularly advantageous. The coating can serve various purposes. On the one hand, it can only be present in some areas at the connection points and then serves above all to produce the adhesive or welded connection. The coating can be an adhesive that can be activated by pressure and / or temperature and / or a chemical reaction, or it can be a mass that is easily meltable. The coating can also perform sealing and protective tasks for the press bale and is then preferably applied over the entire surface of the support insert.

It is particularly advantageous to create strip-like or point-like connections which are very shear-resistant, but on the other hand can easily be peeled off by hand or by machine. On the one hand the packaging withstands the expansion forces exerted by the bale very well, but on the other hand it can be removed again without great effort and in particular without risk of damage to the bale. In addition, the packaging blanks can be removed completely and without residues from the bale.

It is advisable to make the packaging blanks from plastic, in particular from polyethylene. For recycling reasons, it is advantageous here if the support insert and the coating consist essentially of the same type of plastic. Further advantages arise if the materials of the support insert and the Coating have different high melting temperatures, which supports the adhesive and / or melt connection positively. Polyethylene is particularly suitable for this, in which different strengths and melting temperatures can be set in a targeted manner using different manufacturing processes and internal structures.

The packaging device can be of a known type with regard to the device components for feeding, applying and folding the packaging blanks. To produce the adhesive and / or welded connection (s), it has an deliverable sealing device. This can be designed differently and has a heating device and / or a pressing device. For the formation of the punctiform or strip-shaped connections, it is advisable to provide several appropriately shaped punctiform or strip-shaped individual punches on the sealing device, with which the packaging blanks are pressed against one another in punctiform or strip-like fashion and possibly heated at this limited contact area.

Further advantageous refinements of the invention are specified in the subclaims.

Figur 1:

eine Ballenpresse mit einem Preßballen und einer Verpackungsvorrichtung in perspektivischer Ansicht,

Figur 2:

einen eingespannten und verpackten Preßballen mit einer Siegelvorrichtung in Seitenansicht gemäß Pfeil II von Figur 1,

Figur 3:

ein Teil der Siegelvorrichtung in Draufsicht entsprechend Pfeil III von Figur 2,

Figur 4:

einen verpackten Preßballen in Seitenansicht und

Figur 5:

eine abgebrochene Querschnittsdarstellung von Preßballen und Packmittelzuschnitt.

The invention is shown in the drawings, for example and schematically. In detail show:

Figure 1:

a baler with a press bale and a packaging device in perspective view,

Figure 2:

a clamped and packaged press bale with a sealing device in side view according to arrow II of Figure 1,

Figure 3:

a part of the sealing device in plan view according to arrow III of Figure 2,

Figure 4:

a packed baling in side view and

Figure 5:

a broken cross-sectional view of baled and packaging blank.

Figure 1 shows a baler (2) for the production and packaging of baled bales (1). The press bales consist of fibrous materials, in particular short-cut or strand-like textile fibers, so-called staple fibers or tow. The baler (2) is a carousel press, but it can also be of any other type, e.g. a central press system with several pre-presses or the like.

The fibers are filled in a press box (17) and compressed into a bale (1) with press rams (3, 4) under high pressure. The press rams (3, 4) develop high compressive forces of several 100 t, for example 500 t. The bales (1) have a weight of approx. 300-700 kg. The pressed bale (1) is wrapped and packed into several packaging blanks (5, 6, 7) by means of a packaging device (12).

In the embodiment shown, three packaging blanks (5, 6, 7) are used, the packaging blanks forming the lid (5) and the bottom (6) before the pressing box (17) is filled onto the respectively associated pressing punches (3, 4). be placed and delivered by these against the bale (1). The lid (5) and the bottom (6) are then folded by a folding device (18) on the side surfaces of the bale (1). Then the third packaging blank (7) is wrapped around the pressed bale (1) in the form of a belly bandage. For this purpose, it is drawn off from a film roll (19).

2 and 4 illustrate this form of packaging. Alternatively, the abdominal bandage (7) can first be wrapped around the bale (1) and then the lid (5) and base (6) can be folded over and folded.

The folding device (18) and the devices for feeding the packaging blanks (5, 6, 7) can be of any design. The embodiment shown and described above corresponds to the folding technique known from DE-A-40 15 642 and DE-A-40 15 643. Instead of the three-film packaging described here, it is also possible to work with a two-film packaging, as is known, for example, in addition to the associated device from US Pat. No. 3,816,970.

It is also possible to work with a single packaging blank (not shown), which is designed as a sack that is open on one side or as a tube that is open on both sides. After filling, the sack or tube is closed at the open ends using a suitable folding technique and then fixed.

In the invention, the or Packaging blank (s) (5,6,7) connected by welding and / or gluing. This creates a wrapping or packaging for the baling bale (1) which is closed on all sides and which resists the forces of the swelling bale even after the baling pressure (1) is relieved of the press pressure. The invention makes it possible to dispense with additional reinforcement of the packaging by means of straps or strapping or the like. In a worsened embodiment, however, such reinforcements can still be present.

When the press bale (1) is packaged, the individual packaging blanks (5, 6, 7) are placed around the press bale (1) with at least pairs of mutual overlap (10). The overlaps (10) form the connection points. The packaging blanks (5, 6, 7) are glued and / or welded to one another by means of a sealing device (13), whereby the so-called connections (11) are created.

The sealing device (13) is preferably part of the packaging device (12) and is moved with it relative to the clamped press bale (1). For this purpose, the components of the packaging or sealing device (12, 13) are arranged, for example, on two trolleys which can be moved on both sides of the bale (1). Such trolleys are e.g. known from DE-A-40 15 643. Another transport system may also be present, for example according to DE-A-29 11 958.

The sealing device (13) has a heating device (14) and / or a pressure device (15). The individual training and arrangement depends on the connection technology chosen and described below.

As illustrated in FIG. 5, the packaging blanks (5, 6, 7) are constructed in several layers, preferably in two layers. she consist of a solid support insert (8), preferably in the form of a fabric, which absorbs the forces exerted by the expanding press bale (1) and stabilizes the packaging. The support insert (8) can also have embedded stiffening bands or be formed in some other suitable way.

At least at the connection points (10), it is provided with a coating (9) which enables the adhesive and / or fused connection to be produced. The coating (9) is present on at least one side of the support insert (8). In the preferred embodiment, the entire surface of the fabric is laminated with a coating (9). The coating (9) thereby envelops the press bale (1) and protects it against external environmental influences, such as dirt, water, etc. The fixed support insert (8) additionally protects the press bale (1) against mechanical damage.

In the preferred embodiment, the packaging blanks (5, 6, 7) are made of plastic. They are preferably largely tensile, but can be folded and bent. In this respect, they are sufficiently elastic to allow the bale (1) to be struck in the desired manner, but have sufficient internal tensile and tensile strength to the bale (1) after being released from the press rams (3, 4) to keep the shape. The required strengths depend on the type of bale material and can be varied.

It is advisable to make the support insert (8) and the coating (9) of the packaging blanks (5,6,7) from the same type of plastic. This makes them easier to recycle. In turn, polyethylene has particularly favorable properties.

Have the support insert (8) and the coating (9) also preferably different melting temperatures, the melting temperature of the support insert (8) being higher than that of the coating (9). This is again advantageous in connection with polyethylene. Due to the lower melting temperature, the coating (9) can be melted by the sealing device (13) without the support insert (8) being damaged.

In the preferred embodiment, the packaging blanks (5, 6, 7) consist of polyethylene. In this case, the sealing device (13) has a heating device (14) in addition to the pressing device (15). The sealing device (13) is adapted to the arrangement of the overlaps (10) or connection points. The pressure device (15) consists of a plurality of pressure bars extending along the overlaps (10), which can be delivered individually or together on the press bales (1) by means of suitable drives. Heating devices (14) are integrated in the pressure bars. It can be electrical resistance heaters, pipe systems operated with fluidic heating means or the like.

As shown in FIGS. 2 to 4, the pressure bars have a plurality of strip-shaped individual punches (16) which are spaced apart from one another and which protrude a little and produce melt and / or adhesive strips (11) at the connection points (10) when pressed on. They preferably extend vertically or transversely to the longitudinal direction of the overlaps (10). The individual stamps (16) or the melting strips or connections (11) can also be punctiform. In any case, a connection that is periodically interrupted along the overlaps (10) is created.

The punctiform or strip-shaped connections (11) offer sufficient resistance to normal bale forces Strength. They are highly resilient to shear. On the other hand, they can be peeled off relatively easily by hand or with a suitable machine if the outer packaging blank is pulled off transversely to the bale (1).

In the preferred embodiment, the packaging blanks (5, 6, 7) made of polyethylene are connected by supplying heat when the sealing device (13) is pressed on. It is advisable to align the individual packaging blanks (5, 6, 7) and place them around the press bale (1) in such a way that the coatings (9) come to rest on each other at the connection points (10). In the embodiment of Figure 2, the coating on the lid (5) and on the bottom (6) is on the outside, while in the abdominal bandage (7) it is found on the inside facing the press bale (1). The tissue (8) then lies on the outside of the lower third (7). The adjacent coatings (9) melt and adhere to one another while applying pressure and heat.

Alternatively, it is also possible to cut (5,6) a tissue side (8) into contact with a coating side (9) in the packaging and to stick it together by melting the coating (9). In this way, one can, for example, overlap and staple the ends of the abdominal bandage (7).

In a further alternative, the coating (9) can also consist of a suitable adhesive. There are different ways of doing this. For example, coated beads can be embedded in the coating (9), which burst under the pressure of the pressed-on pressure device (15), release the adhesive and thereby ensure a connection. In this embodiment, in which the coating (9) alone by Pressure is activated in its connection effect, heat supply and a heating device (14) can be dispensed with. In this embodiment, it is also advisable to provide the coating (9) only at the overlaps or connection points (10). In these and other cases, the packaging blanks (5, 6, 7) can also have more than two layers, for example by impregnating or laminating the support insert (8) with an additional sealing coating.

In a further alternative, the coating (9) can also consist of a thermal adhesive which is activated by the application of pressure and heat. Furthermore, contact adhesives made of two separate, different components can be used, which react chemically and combine when they meet. In this case e.g. to find the components in two coatings (9) to be brought into contact with one another analogously to FIG. 2. Depending on the choice of material and treatment, the various connection options can result in pure adhesive connections, pure fusion connections or combined adhesive-fusion connections.

Modifications of the described embodiment are possible in different ways. In addition to the aforementioned variations in the technical design of the baling press (2), the choice of material for the baling press (1) and the packaging and folding technology, the sealing device (13) can also be modified. The pressure bars can also act over the entire area of the overlaps or connection points (10) and have no strip or point-shaped individual stamps (16). In a further modification, the individual punches (16) can be present in smaller numbers and with independent drives, whereby they are moved along the clamped baling bale (1) and in the process alternately fed to create a connection (11) and then again be transported. The sealing device (13) can also be combined with the folding device (18), in that the first melting strips or connections (11) are already attached while the folding device (18) still wraps the abdominal bandage (7) around the baling ball (1).

Alternatives are also possible in the choice of material for the packaging blanks (5,6,7). In addition to polyethylene, other plastics or other form-elastic and tensile or stretch-resistant materials are also suitable. Mixtures of materials are also possible, it also being possible to use different plastics.

REFERENCE SIGN LIST

1

Baled

2nd

Baler

3rd

Press stamp, below

4th

Press stamp, top

5

Packaging cut, lid

6

Packaging cut, bottom

7

Packaging blank, lower third

8th

Support insert, fabric

9

Coating

10th

Overlap, joint

11

Connection, melting strips

12th

Packaging device

13

Sealing device

14

Heater

15

Pressure device

16

Single stamp

17th

Press box

18th

Folding device

19th

Wrap

Claims (19)

1. Process for packing pressed bales (1) of fibrous materials, in particular cut or strand-shaped textile fibres, in a baling press (2) using one or more packing blanks (5,6,7) exhibiting elasticity of shape which are wrapped with an overlap (10) around the pressed bale (1), the pressed bale (1) being under high pressing pressure and the packing blanks (5,6,7) being joined together by adhesive bonding and/or fusing, characterised in that the pressed bales (1) are packed using a tension- and elongation-resistant packing blank (5,6,7) comprising at least two parts, a force-absorbing supporting lining (8) and a fusible and/or adhesive coating (9) present at least in certain regions, the overlaps (10) of the packing blanks (5,6,7) being laid onto the side faces of the pressed bale (1) and, lying on the pressed bale (1), shear-resistantly adhesively bonded and/or fused.
2. Process according to Claim 1, characterised in that the packing blanks (5,6,7) are laid at the overlap (10) inside over outside.
3. Process according to Claim 1 or 2, characterised in that the packing blanks (5,6,7) are brought into mutual contact by their coatings (9).
4. Process according to Claim 1 or one of the subsequent claims, characterised in that the packing blanks (5,6,7) are held together during the joining operation by pressure and/or heat.
5. Process according to Claim 1 or one of the subsequent claims, characterised in that strip- or point-shaped joints (11) are created.
6. Process according to Claim 1 or one of the subsequent claims, characterised in that the packing blanks (5,6,7) are produced from plastic, preferably polyethylene.
7. Process according to Claim 6, characterised in that the supporting lining (8) and the coating (9) consist essentially of the same kind of plastic.
8. Process according to Claim 1 or one of the subsequent claims, characterised in that the materials of the supporting lining (8) and of the coating (9) have different fusing temperatures.
9. Process according to Claim 8, characterised in that the fusing temperature of the supporting lining (8) is higher than the fusing temperature of the coating (9).
10. Device for packing pressed bales (1) of fibrous materials, in particular cut or strand-shaped textile fibres, in a baling press (2) using one or more packing blanks (5,6,7) exhibiting elasticity of shape which are wrapped with an overlap (10) around the pressed bale (1), the pressed bale being under high pressing pressure and the packing blanks (5,6,7) being joined together by adhesive bonding and/or fusing by means of a movable sealing device, characterised in that the packing device (12) has a folding device (18) which lays the tension- and elongation-resistant packing blanks (5,6,7) with the overlaps (10) onto the side faces of the pressed bale (1), and in that the sealing device (13) can be advanced onto the pressed bale (1) for the shear-resistant welding and/or adhesive bonding of the packing blanks (5,6,7).
11. Device according to Claim 10, characterised in that the sealing device (13) has a heating device (14) and/or a pressing-on device (15).
12. Device according to Claim 10 or 11, characterised in that the sealing device (13) has a plurality of point- or strip-shaped individual rams (16).
13. Packing blank exhibiting elasticity of shape for packing pressed bales of fibrous materials, in particular cut or strand-shaped textile fibres, in a baling press, which packing blank comprises a plurality of components and has a fusible and/or adhesive coating (9) arranged at least in certain regions, characterised in that the packing blank (5,6,7) has a supporting lining (8).
14. Packing blank according to Claim 13, characterised in that the supporting lining (8) is in the form of a woven fabric.
15. Packing blank according to Claim 13 or 14, characterised in that the coating (9) is arranged on at least one side of the supporting lining (8) and covers the latter over its entire area.
16. Packing blank according to Claim 13 or one of the subsequent claims, characterised in that the packing blank (5,6,7) consists of plastic, preferably polyethylene.
17. Packing blank according to Claim 16, characterised in that the supporting lining (8) and the coating (9) consist essentially of the same kind of plastic.
18. Packing blank according to Claim 13 or one of the subsequent claims, characterised in that the materials of the supporting lining (8) and of the coating (9) have different fusing temperatures.
19. Packing blank according to Claim 18, characterised in that the fusing temperature of the supporting lining (8) is higher than the fusing temperature of the coating (9).

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