EP2138406B1 - Sack and device for emptying a sack - Google Patents

Abstract

The method involves covering cross bottom with a bottom cover sheet (18). The bottom cover sheet is drawn off from a narrow sidewall and from part of adjoining bottom flaps (12). One of the bottom flaps is torn on a far side of the corner tuck in order to separate a part (12') of the bottom flaps with respect to free edges. The separated parts are bent together with a corner tuck by being folded up about the folding lines (13) via which emptying of the bag contents takes place into a pour-out channel. An independent claim is also included for a bag including a material ply formed into a closed tube.

Description

The invention relates to a method for emptying a bag, which has at least one covered with a bottom cover sheet cross bottom, which has a substantially rectangular shape and is glued from narrow side walls on folding lines corner folds and wide side walls folded over fold lines bottom flaps, wherein the bottom flaps overlap each other in an overlap area and are interconnected in the overlap area.

The invention further relates to a bag, which is formed by at least one material layer, which is formed into a closed, malleable to a substantially rectangular cross section with narrow side walls and wide side walls hose having at a first end a closable filling opening and at least one its ends are glued to a cross-bottom with corner flaps angled from the narrow side walls and bottom flaps angled from the broad side walls, the flaps overlapping each other in an overlapping area and interconnected in the overlap area as upper and lower flaps, and wherein the cross-bottom covered by a ground cover sheet.

A bag according to the respective preamble of claim 1 and claim 5, is made DE 2323 726 known.

The formation of a bag of a tubular material by folding at least one cross-bottom is a common method. In this case, a cross bottom can be provided on both ends of the bag tube, wherein in particular one of the cross bottoms, a valve is used, so that a fillable by a bag filling machine valve bag is formed. However, it is also possible, for example, to form a sack bottom only on one side of the hose and to fill the bag which is open at the top and to close it after the filling, for example, by sewing, gluing, sealing by adhesive or Velcro strips, etc.

A filled bag should be sealed as tightly as possible to avoid dusting of material even when dusty. When the filled bag has been transported to its destination where the bottled product is to be used, the bag is torn open to dump or otherwise remove the bottled material. Since the bag bottom consists of numerous layers that have been glued together, the bag bottom is not suitable for the tearing process. The tearing of the bag below the bottom takes place in the tubular material of the jacket wall of the bag. In a free tearing it is more common that the crack produced does not extend in the desired manner transverse to the longitudinal axis of the bag, but is formed obliquely with a component in the axial direction. It may happen that the crack continues into the height of the bagged product in the bag, so that even when tearing an undesirable leakage of product from the bag occurs and the area in which the bag is torn, contaminated. A remedy may be that the bag is opened with a sharp cutting instrument in the form of a pair of scissors or a knife. A disadvantage of this is the resulting time required for the opening of the bag and the fact that for the opening of the bag always an extra provided and functional held aids is required.

With the US 5,823,685 It has been proposed to form a sack with a cross bottom in which, although the bottom flaps overlap each other, but are not interconnected. The closure of the bag is carried out with a bottom cover sheet, which extends over the entire length of the rectangle formed in the filled state of the bag bottom is connected to the parts of the crossbeam with such an adhesive that the bottom cover sheet is removable from a protruding end of the ground. As a result, the bag can be easily opened by the bottom cover sheet is partially removed from the ground and with the not connected Eckeinschlägen and bottom flaps a Ausschütttülle is formed. In this construction, the bottom cover attached to the peelable adhesive must take over the sole and complete closure of the bag. There is a risk that the bottom sheet is accidentally raised from its protruding end, which can easily empty the bulk material in the bag.

EP 1 033 311 A2 discloses a cross bottom in which the bottom flaps are glued together. The so closed bottom is covered with a ground cover sheet which is glued to the parts of the floor with a conventional glue. In this bag, a tear strip is incorporated so that the bag can be torn open at the corner impact. This construction provides for the incorporation of the pull tab, which makes the construction more expensive. In addition, accidental tearing is also possible due to the unfortunately jammed pull tab.

JP 61-153731 A and US 7,285,082 B1 disclose cubic carton packages in which a corner in the region of a narrow side wall are provided with tear lines through which part of the wall can be torn off from the packaging. Through the opening thus formed can then be removed in the bottom area packed items or bulk material from the packaging are distributed overhead. For a generic bag, such a removal of wall elements is not suitable.

The present invention is therefore based on the object to enable the emptying of a bag without tools and without the risk of hardly avoidable contamination.

This object is achieved by a method of the type mentioned above in that the bottom cover sheet is deducted from a narrow side wall, starting from the respective Eckeinschlag and of a part of the adjacent bottom flaps, that in the overlap region upper bottom flap is torn transversely to its free edge to the adjacent wide side wall for separating a part of the bottom flap, then that the lower bottom flap is torn transversely to its free edge to the adjacent wide side wall for separating a part of this bottom flap and that the separated parts of the bottom flap Bottom flaps are bent together with the corner wrapping by folding around the fold lines to a discharge chute, via which the emptying of the bag contents takes place.

According to the invention it is thus provided that the tearing of the bag for the purpose of its emptying in the bottom area is carried out by the bottom cover sheet is at least partially deducted from the overlapping bottom flaps. This peeling off can be assisted by a suitable gluing of the bottom cover sheet and / or by providing the bottom cover sheet with a peel-off aid, for example in the form of a tear-off strip. When the bottom flaps are exposed in their mutually overlapping region, the tearing of the bottom flaps is perpendicular to the longitudinal and tearing direction of the bottom cover sheet, to the adjacent wide side wall. As a result, a part of the two bottom flaps is exposed and can be folded up to the wide side wall out existing fold line. Possibly. In this case, an existing bond between the bottom flap and the associated corner impact is released. This opening process can thus be supported by the fact that this bonding is performed only on a small area. By folding up the bottom flaps, the corner flap not glued to the bottom flaps on the inside can also be folded up. It thus creates a by three sides (two bottom flaps and Eckeinschlag) limited coherent discharge opening. Since the corner impact has a central fold line, resulting from the laying flat of the bag tube for transport before filling, it is readily possible to use the still existing fold line to fold the corner V-shaped and to realize a triangular discharge chute.

The inventive method thus allows the formation of a discharge opening in the region of the bottom, wherein the tearing process occurs during detachment of the bottom cover sheet and tearing of the bottom flaps in the bottom region and therefore is uncritical for the bottled in the bag product. Any oblique tears remain in the bottom area and do not cause unintentionally bottled product leaking from the bag. The inventively designed discharge chute allows a safe dumping of the product from the bag, the limitation of the discharge chute is not made by torn bag walls, but taking advantage of the cut edges produced in the production of the bag.

To facilitate the tearing of the bottom flaps these can be provided with Aufreißhilfen, Particularly suitable are short incisions that do not go beyond the overlap region of the two bottom flaps and ensure a defined beginning of extending to the adjacent wide side wall tear line in the bottom flap and the directional scattering for significantly limit the tear line.

To solve the above-mentioned problem, a bag of the type mentioned above is further characterized in that the bottom cover sheet is peelable from a narrow side wall at least over a portion of the cross bottom on the respective Eckeinschlag addition that at least the upper of the bottom flaps in a no longer lying on the corner hitting area at least one tear-open to separate a portion of the bottom flaps, so that the separated parts of the bottom flaps together with the outwardly drawn corner hump form a discharge chute.

The peelability of the ground cover sheet can be assisted by suitable bonding of the ground cover sheet to the ground. In particular, a bond between the ground cover sheet and the corner impact may be provided, which does not continue in the region of the bottom flaps.

The peelability of the bottom cover sheet may be further assisted by a tear strip in the bottom cover sheet.

In a preferred embodiment, the recess of the bottom flap, which is provided as a tear-open, is limited to less than half the length of the bottom flaps. In particular, it is expedient that the incision extends only over the area in which the two bottom flaps overlap one another, so that the incision does not impair the tightness of the cross base for transporting the product from the filling station to the place of use.

The present invention is particularly suitable for sacks made of easily rupturable materials, such as kraft paper sacks. In this case, the sacks can also be designed in multiple layers. However, the present invention can also be implemented on suitable plastic bags, in particular if the tear-open aid possibly extends over the entire length of the tear lines. In addition to the tear strips mentioned, perforation lines, in particular slot perforations, come into consideration as tear-open aids.

Figur 1

einen flach liegenden Sackschlauch mit Eckeinschlägen und vor- gerillten Bodenfaltlinien sowie einem Bodendeckblatt;

Figur 2

eine perspektivische Darstellung eines geschlossenen Bodens mit einem teilweise abgezogenen Bodendeckblatt;

Figur 3

die perspektivische Darstellung gemäß Figur 2 mit einer ersten eingerissenen Bodenklappe;

Figur 4

die Darstellung gemäß Figur 3 mit einer durch Einreißen freige- legten zweiten Bodenklappe;

Figur 5

eine perspektivische Darstellung gemäß Figur 4, bei der auch der Eckeinschlag zur Ausbildung einer Ausschüttrinne hochgebogen ist.

The invention will be explained in more detail below with reference to an embodiment shown in the drawing. Show it:

FIG. 1

a flat-lying bag tube with corner folds and pre-grooved bottom fold lines as well as a bottom cover sheet;

FIG. 2

a perspective view of a closed bottom with a partially peeled ground cover sheet;

FIG. 3

the perspective view according to FIG. 2 with a first cracked bottom flap;

FIG. 4

the representation according to FIG. 3 with a second bottom flap released by tearing;

FIG. 5

a perspective view according to FIG. 4 , in which the corner impact is bent up to form a discharge chute.

FIG. 1 shows a tubular jacket wall 1 of a bag, which is folded on two Seitenfaltlinien 2, 3 for flattening the layers of the jacket wall 1 to each other. The tubular jacket wall 1 is formed from a flat material by folding on the Seitenfaltlinien 2, 3 and connected, for example by a Längsverklebung to the closed tube in an overlapping region. The Längsverklebung is not shown in the drawing.

FIG. 1 illustrates that the cut off from an endless material hose at both ends with a cross-bottom 4, 5 is provided. The in FIG. 1 illustrated bottom cross-base 5 consists of two opposing Eckeinschlägen 6 and two opposing bottom flaps 7, which thus form the cross-shaped material of the cross-bottom 5. The bottom flaps 7 are shown hatched on their insides Bonding zones 8, 9 are provided, of which the adhesive zones 8, the connection with the corner weft 6 and the adhesive zone 9, the connection of the folding over each other after folding bottom flaps 7 together. Over one of the corner fences 6 is in FIG. 1 symbolically illustrated a valve 10, which may be formed in one of the numerous known embodiments. The valve 10, which may for example consist of a tubular folded insert sheet is inserted into the ground before folding the bottom flaps 7 and thus firmly connected to the ground. About the valve 10, the filling of the bag by means of a (not shown) filler of a (not dargstellten) filling machine.

Trained at the other end of the jacket wall 1 cross bottom 4 is inventively designed so that it can be done emptying the bag. The cross bottom 4 is also formed by corner lugs 11 and bottom flaps 12. The bottom flaps 12 of angled with the layers of the cylindrical jacket wall 1 by means of fold lines 13, 14. Corresponding fold lines 13, 14 continue in the area of the corner laps 11. Since the corner bumps 11 has been formed after the folding of the cylindrical jacket wall 1 to a flat hose along the Seitenfaltlinien 2, 3, set the Seitenfaltlinien 2, 3 in the Eckeinschläge 11 as central fold lines 2 ', 3' away. The triangular corner folds 11 extend in one-piece connection into the region of the bottom flaps 12, so that the bottom flaps 12 are double-walled by the sections of the corner folds 11 beyond the fold lines 13, 14.

It can be seen that the bottom flaps 12 are provided on their inside with adhesive surfaces 15, 16, by the folding of the bottom flaps 12 about the fold lines 13, 14, an adhesive bonding of the bottom flaps 12 with the central portions of the Eckeinschläge 11 on the one hand and between the overlapping Regions of the bottom flaps 12 on the other hand is produced.

First, the folding around the fold line 14 bottom flap 12 (in FIG. 1 folded upwards), whereby the bonding with the central portions of the Eckeinschläge 11 via the adhesive surfaces 15 takes place. It is recognizable that in FIG. 1 for the right of the two Eckeinschläge 11 a bond only over a narrow strip 15 'between the bottom flaps 12 and corner insert 11 is provided.

After the bottom flap 12 has been folded around the fold line 14 and adhered to the weft 11, the bottom flap 12 is folded around the fold line 13. With the adhesive surfaces 15, 15 'is an adhesion of not yet covered by the other bottom flap 12 portion of the impact 11 and the overlapping region of the two bottom flaps 12 together. To complete the bonding of the two bottom flaps 12 with each other, the strip-shaped adhesive surface 16 which extends parallel to the fold lines 13, 14 serves.

The two bottom flaps 12 have outside of the right Eckeinschlags 11 perpendicular to their free edges extending short cuts 17, which thus extend parallel to the free edge of the adjacent Eckeinschlags 11. The cuts 17 extend only in the overlapping region of the two folded bottom flaps 12.

One of the two bottom flaps 12 is covered with a rectangular bottom cover sheet 18. The bottom cover sheet 18 in this embodiment covers the complete bottom of the bag after it has been formed after filling into a substantially rectangular cross-section as shown in FIGS FIGS. 2 to 5 is shown.

The bottom cover sheet 18 has on one of the short side a V-shaped adhesive surface 19, by which a bonding of the bottom cover sheet 18 takes place with a central region of the associated corner impact 11. However, this bond 19 keeps a clear distance to the adjacent bottom flap 12th

Incidentally, the bottom cover sheet 18 is provided on its inside with adhesive surfaces 20 which extend as longitudinally extending strips to the adhesive surface 19 and as a transverse front-side connecting strip on the bottom cover sheet 18.

Further, the bottom cover sheet 18 is provided with an elongated tear strip 21 which is disposed approximately centrally in the bottom cover sheet and can extend over its full length.

FIG. 2 shows that from the blank according to FIG. 1 formed sack, which has the cross bottom 4 on its upper side.

The bottom cover sheet 18 has been removed by means of its tear strip 21 from the material of the corner impact 11 and the bottom flaps 12, so that the recess 17 of the upper bottom flap 12 is exposed. The tear strip 21 ensures that in the area occupied by him no (unwanted) bonding between ground cover sheet 18 and sack bottom takes place.

FIG. 2 indicates that the ground cover sheet 18 is provided in the illustrated embodiment with a free stamped support strip 22.

The next step of opening the bag for emptying is in FIG. 3 shown. By tearing the upper bottom flap 12 at the recess 17 to the fold line 13, where the bottom flap 12 is connected to large side walls of the cylindrical shell wall 1, a portion 12 'of the bottom flap 12 can bend around the fold line 13 upwards. As a result, the incision 17 of the lower bottom flap 12 is exposed.

In the next step, the in FIG. 4 is shown, the bottom bottom flap is also torn open by means of the incision 17 to the fold line 14, whereby a portion 12 'of the bottom flap 12 can also be bent.

The upwardly bent portions 12 'of the bottom flaps 12 are predominantly formed two layers, as they have a convolution with parts of the corner impact 11 are connected.

The central region of the corner impact 11 can now be bent upwards around a folding line 23, as shown in FIG FIG. 5 is shown. By unfolding the material of the corner insert 11 from the material of the part 12 'of the bottom flap 12, a dispensing channel 24 is formed which is bounded by three sections of material 25, 25', 25 "The sections of material 25, 25 'and 25" are at the top limited in the manufacture of the bag cut smooth edges, so that a defined discharge chute 24 is. Since the material portion 25 is provided with a portion of the fold line 3, the discharge chute 24 can be easily formed by a V-shaped fold on the fold line 3 a triangular discharge chute 24 in the form of a V. As a result, targeted pouring of the product filled into the bag can be ensured even with small amounts of dumping.

According to the invention thus a defined discharge chute 24 made of the material of the crossbeam 4 can be produced, which allows a defined pouring the product out of the bag without the risk of contamination. In particular, the handling of highly polluting or even toxic materials is greatly facilitated.

In the illustrated embodiment, the formation of the discharge chute 24 provided cross bottom 4 is located on the opposite end of the cylindrical casing wall 1, where the provided with a valve 10 cross-bottom 5 is formed. Of course, the inventive formation of the discharge chute 24 can just as well be done in the cross-bottom 5, which is provided with a valve 10 for filling the product in the bag. The arrangement of a bottom cover sheet 18 with a carrying handle 22 on the opposite end of the valve 10 of the bag, however, has the advantage that when carrying the bag, the product weight is on the valve 10 and this, if necessary, closes. Nevertheless, a corresponding emptying opening for forming a discharge chute 24 can also be provided in a cross-bottom 5 provided with a valve 10.

Claims (10)

1. Method for emptying a bag which has at least one cross bottom (4) which is covered with a bottom cover sheet (18) and has an essentially rectangular shape and which is glued together out of corner tucks (11) angled from narrow sidewalls via folding lines and out of bottom flaps (12) angled from wide sidewalls via folding lines (13, 14), wherein the bottom flaps (12) overlap one another in a region of overlap and are connected to one another in the region of overlap, characterized in that the bottom cover sheet (18) is drawn off, starting from a narrow sidewall, from the respective corner tuck (11) and from part of the adjoining bottom flaps (12), in that the upper bottom flap (12) in the overlap region is torn transversely with respect to its free edge, as far as the adjoining wide sidewall, in order to separate a part (12') of the bottom flap, in that the lower bottom flap is then torn transversely with respect to its free edge, as far as the adjoining wide sidewall, in order to separate a part (12') of this bottom flap, and in that the separated parts (12') of the bottom flaps (12), together with the corner tuck (11), are bent, by being folded up about the folding lines (13, 14, 23), into a pour-out channel (24), via which the emptying of the bag contents takes place.
2. Method according to Claim 1, characterized in that the bottom cover sheet (18) is provided with a tear-open strip (21) by means of which the bottom cover sheet (18) is drawn off.
3. Method according to Claim 1 or 2, characterized in that the bottom flaps (12) are provided with tear-open aids (17), by means of which the tearing of the bottom flaps (12) is carried out.
4. Method according to one of Claims 1 to 3, characterized in that the pour-out channel (24) is shaped in the form of a V by means of a middle fold (3') of the narrow sidewall.
5. Bag for carrying out the method according to one of Claims 1 to 4, formed by at least one material ply which is formed into a closed tube (1) which can be shaped into an essentially rectangular cross section with narrow sidewalls and wide sidewalls and which at a first end has a closable filling orifice and at least one of its ends is glued together into a cross bottom (4) with corner tucks (11) angled from the narrow sidewalls and with bottom flaps (12) angled from the wide sidewalls, wherein the bottom flaps (12) overlap one another in a region of overlap and are connected to one another as an upper and a lower bottom flap (12) in the region of overlap, and wherein the cross bottom (4) is covered with a bottom cover sheet (18), characterized in that the bottom cover sheet (18) is designed to be capable of being drawn off, starting from a narrow sidewall, at least over a partial region, from the cross bottom (4) via the respective corner tuck (11), and in that at least the upper of the bottom flaps (12) has, in a region not lying on the corner tuck (11), at least one tear-open aid (17) for separating a part (12') of the bottom flaps (12), so that the separated parts (12') of the bottom flaps (12), together with the outwardly drawn corner tuck (11), form a pour-out channel (24).
6. Bag according to Claim 5, characterized in that the draw-off capability of the bottom cover sheet (18) is ensured by means of a suitable adhesive bond (19, 20).
7. Bag according to Claim 5 or 6, characterized in that the draw-off capability of the bottom cover sheet (18) is assisted by a tear-open strip (21).
8. Bag according to one of Claims 5 to 7, characterized in that the tear-open aid (17) is formed by an incision directed transversely with respect to the free edge of the bottom flap (12).
9. Bag according to Claim 8, characterized in that the incision extends over less than half the length of the bottom flaps (12).
10. Bag according to Claim 9, characterized in that the incision extends only over the region in which the two bottom flaps (12) mutually overlap.

Images