EP3541717A1

EP3541717A1 - Multilayer valve bag

Info

Publication number: EP3541717A1
Application number: EP18710808.9A
Authority: EP
Inventors: Walter Plattner; Jens Stamm; Michael Merschmann; Alexander Diener; Andreas Braun
Original assignee: Dy Pack Verpackungen Gustav Dyckerhoff GmbH
Current assignee: Dy Pack Verpackungen Gustav Dyckerhoff GmbH
Priority date: 2017-03-13
Filing date: 2018-03-05
Publication date: 2019-09-25
Anticipated expiration: 2038-03-05
Also published as: EP3541717B1; WO2018166833A1; DE202017001357U1

Abstract

The invention relates to a valve bag for bulk material, comprising a stand base and a valve base opposite the stand base. A valve for filling the valve bag is incorporated into the valve base, and the bag is made of a two- or multilayer blank made of a flat material, in particular paper. The blank has a transverse adhesive bonding along at least one of the base-side edges of the blank, said transverse adhesive bonding connecting adjacent material layers together. The invention is characterized in that at least one of the bases with a transverse adhesive bonding is designed as a ventilation base that has a base fold in which lateral flaps are folded around lateral folding lines running in a base longitudinal direction in order to form the base. The width of the lateral flaps is designed such that a gap remains between the lateral flaps when the ventilation base is folded closed, and the transverse adhesive bonding has recesses in the region of the two lateral flaps of the ventilation base, said recesses forming an outlet for air leaking out of the intermediate space between the material layers.

Description

Multi-layer valve bag

The invention relates to a valve bag for bulk material such as cement, gypsum, granules, animal feed or the like, from a two- or multi-layer sheet material, preferably paper and / or plastic, and with a floor stand and a floor standing opposite the valve bottom. Preferably, standing and / or valve bottom are formed in a cross or block bottom folding manner. In the valve bottom, a valve for filling the valve bag is incorporated. Preferably, such bags have one or more paper layers, which may also consist of a paper composite and / or coated paper, and may optionally be provided as a liner, a plastic film.

Such bags are well known and are used in particular for the packaging and transport of fine-grained bulk material. Usual sizes are 5kg, 10kg or 25kg. A multilayer bag is z. As described in DE 20 2014 000 194, and a bag with intermediate plastic film in EP 1 858 769 B1.

For producing such sacks are usually webs of the sheet material, for. B. paper webs, piled up in a tube machine and closed to form an endless tube, which is then cut into pieces of suitable length, from which finally formed the bag is, for. B. by way of a cross or block bottom folding. Accordingly, such bags are formed from a two- or multi-layer, typically rectangular blank of sheet material. At the ends of the hose pieces or at the corresponding edges of the blank, the bag bottoms are usually prepared by a suitable folding, wherein at the end of the sack manufacturing process, the bottom fold is fixed, for. B. by a suitable bond.

Along the cut edges of the hose pieces a strip-shaped transverse bonding is usually mounted between the webs, u. a. to avoid that the material layers of the blank shift against each other during the further sack manufacturing process. It is already known to carry out the transverse bonding as a continuous adhesive line, or as a line of equidistant closely adjacent adhesive dots. Typically, the transverse bonding is applied at both ends of the hose pieces, but it is also conceivable to attach the transverse bonding only at one end of a piece of hose.

To fill such valve bags is in the valve bottom a valve, z. B. in the form of a valve tube, incorporated. For filling, the bag with the valve is plugged onto the filler neck of a bottling plant, and the contents are introduced into the bag with a stream of air. This requires venting of the bag during and after filling. In suitably trained paper bags, the venting usually takes place through the paper walls of the bag.

In order to fill bags as quickly and economically as possible, a high filling speed is desired. This requires the highest possible ventilation performance of the bag, although the strength and stability of the bag must not be affected. Especially towards the end of the filling, a high internal pressure arises in the bag, so that frequently a slower filling speed has to be passed in this phase. Usually, the bag with the valve hangs on the filler neck of the bottling plant, and the introduced filling material initially falls onto the bottom of the stand, the filling level in the course of the further filling. ment increases towards the bottom of the valve. In order to avoid a transition to a lower filling speed in the final phase of the filling process, an increase in the venting performance in the region of the valve bottom is therefore desirable in particular.

Against this background, the invention has for its object to propose improved ventilation for multi-layer valve bags, especially in the field of soils, especially in the area of the valve bottom, the stability and strength of the bag should be as little as possible affected at the lowest cost and ease of manufacture.

The object is achieved by a valve bag having the features of claim 1. Advantageous embodiments are the subject of the dependent claims.

According to the invention, it is provided that at least one of the trays with transverse bonding is designed as a vent bottom. The vent bottom has a bottom fold in which side flaps are folded to extend the bottom longitudinal direction Seitenfalzlinien to put the bottom. In this case, the side flaps have a width which is smaller together than the width of the applied vent base, so that when the vent bottom is a gap between the side flaps remains. Furthermore, according to the invention, it is provided that the transverse gluing in the area of both side flaps of a ventilation floor has recesses through which air can escape from the intermediate space between the layers of material connected to the transverse gluing.

In this way, in particular air, which is located in the wall area between the connected layers of material, easily escape via both side flaps in the area of the vent floor. In the case of the widely used rectangular sack formats, this allows good air to be vented both in the region of the front wall and in the region of the rear wall via the recesses in the transverse gluing of the side flaps. The recesses are cut in width and number selected so that they allow a good air outlet. It is advantageous if the individual recesses are about one to a few centimeters wide, or at least 1 cm, preferably at least 2cm and more preferably at least 3cm wide. It is also advantageous if the total width of all recesses in a side flap is several centimeters, preferably at least 2 cm, more preferably at least 4 cm and even more preferably at least 6 cm or at least 8 cm. In another advantageous embodiment, the total width of the recesses occupies at least 30% of the length of the edge of a side flap facing the gap, preferably at least 50% and more preferably at least 70% of said length. Advantageously, the recesses of a side flap can be formed by two recesses with a few centimeters wide, which are arranged symmetrically to the longitudinal center of the side flap. Alternatively, it is also conceivable to arrange a very wide recess in the longitudinal center of the side flap, z. B. of at least 5cm, preferably at least 7cm and more preferably at least 9cm width.

According to another advantageous embodiment, the recesses are symmetrical to each other on both sides of the gap. Thus, a very uniform ventilation of the front and the rear wall can be achieved.

In the case of a dotted transverse crease line, the recesses may be formed in such a way that some adhesive dots are omitted from a line with equidistant adhesive dots. Likewise, the recesses can be realized by the fact that in an adhesive line with equidistant adhesive dots, the free distance between adhesive dots is chosen sufficiently large, so that a good venting is possible.

It has been found that a significant increase in the ventilation performance over the prior art can be achieved by the inventive design. Among other things, this is based on the fact that air from the intermediate area between individual layers of material can escape well into the outside space via both side flaps. The advantages of the invention are particularly important for when outer material layers of the sack have a lower air permeability than inner material layers. This is becoming increasingly important in practice, because due to increasing demands on the protection of the filling material, outer material layers must increasingly be formed with an air and / or water impermeable coating or as a plastic film.

Furthermore, the invention allows cost savings through material savings, because due to the narrower side flaps of the vent panels according to the invention, the bag can be made with shorter pieces of tubing.

Advantageously, the valve bottom is designed as a vent bottom. This makes possible, especially in the final phase of the filling process, an improved ventilation, so that the filling speed does not have to be reduced or only to a lesser extent towards the end of the filling. According to another advantageous embodiment of the floor standing is designed as a vent floor. This allows, in particular after removal of the bag from the filler neck of the filling system, an improved residual ventilation of the bag. It is particularly advantageous if the valve and floor are designed as a vent floor.

In another preferred embodiment, the innermost material layer of the bag material is formed from an air-permeable material. This may preferably be paper, which may additionally be perforated, in particular if it is provided with a coating which reduces the air permeability. Similarly, a perforated plastic film is conceivable as an air-permeable material. With an innermost, air-permeable material layer, air can escape from the interior of the bag well into the space between the innermost material layer and the next outer material layer and be discharged there between further layers of material in the direction of the ventilation floor, where it passes through the recesses in the Venting transverse bonding can be done. Advantageously, at least one outer material layer of the sack mate neck is formed from an air- and / or water-impermeable material, advantageously from a plastic film or coated paper. By such a material layer can, as already mentioned, z. B. the entry of moisture or gaseous substances from the outside are avoided in the bag or the contents are protected from external influences. At the same time, the venting according to the invention makes it possible for the air to be guided along this layer of material to the ventilation floor and escape there through the recesses in the transverse gluing.

Particularly advantageously, the bag according to the invention is formed in three layers, with an innermost and an outermost layer of material made of paper and interposed a plastic film. The intermediate plastic film protects the contents from moisture and the inner paper layer, together with the inventive design of the vent floor ensures the vent, while the outer paper layer provides strength.

In another preferred embodiment, the gap between the side flaps is at least 1 cm wide, more preferably at least 2 cm wide, and even more preferably at least 3 cm wide. With these gap widths on the one hand a good venting is possible, and on the other hand in typical bag formats a stable and solid ground. In this case, the more material can be saved, the wider the gap.

According to another preferred embodiment, the vent bottom is sealed with an inserted into the open bottom of the inner bar, so that in the area of the vent floor no filling material can escape from the bag. Advantageously, the sealing is carried out by a peripheral to the edge of the inner bolt bonding with the open vent bottom. The necessity of sealing against Füllgutaustritt results from the fact that in the vent bottom according to the invention between the side flaps remains a gap could escape through the contents, if it would not be closed to the bag interior. This closing can be done by a conventional manner in the venting the inserted inner hanger. Advantageously, the inner bar is formed of PE-coated paper or plastic film. This can prevent moisture from entering the bag in the area of the inner bar. According to another preferred embodiment, the inner bar is made of an air-permeable material, preferably paper. Then it can also be vented through the inner latch, especially in the region of the gap between the side flaps, and so the ventilation performance can be further increased.

According to another preferred embodiment, the vent base is glued over with a cover sheet in such a way that, moreover, an escape of the air emerging from the recesses in the transverse gluing into the exterior space is possible. This can be achieved in that the contour of the adhesive application for the cover sheet has suitable recesses, which allow the emerging from the recesses of the transverse bonding air escape to the outside, and / or in that the cover sheet is made of highly porous paper. It is achieved by pasting over the cover sheet, that the gap between the side flaps of the vent base is closed. Therefore, with an appropriate cover sheet overcoat, it may be possible to dispense with an internal bolt. With a cover sheet of PE-coated paper, the bag against the ingress of z. B. moisture can be protected.

Further advantageous features of the invention will become apparent from the following explained with reference to figures embodiment.

Show it:

Fig. 1: a schematic plan view of a bag according to the invention with in

Kreuzbodenfaltweise formed valve and floor

Fig. 2: a plan view of an open bottom of an inventive

Sackes in Kreuzbodenfaltweise 3 shows a schematic view of an endless paper web for producing a bag according to the invention

4 shows a schematic view of a two-ply paper blank for producing a bag according to the invention with recesses in the transverse bonding

4a shows a schematic view of a variant of the two-ply paper blank for producing a bag according to the invention with recesses in the transverse bonding

Fig. 5: a plan view of the open vent bottom of a bag according to the invention

5a: a plan view of the open vent bottom of a variant of the bag according to the invention

Fig. 6: a plan view of the applied vent bottom of a bag according to the invention

6a: a plan view of the applied vent bottom of a variant of the bag according to the invention

Fig. 7: a plan view of the open, sealed with an inner bar

Vent bottom of a bag according to the invention

8: a schematic representation of the closing of the side flaps of the

Vent bottom of a bag according to the invention

Fig. 9: a plan view of the applied vent bottom of a bag according to the invention with inner latch Fig. 9a: a plan view of the added vent bottom of a variant of the bag according to the invention with inner latch

10 shows a schematic representation of the over-bonding of a ventilation floor according to the invention with a cover sheet

Fig. 1 1: a schematic representation of the vent in a bag according to the invention

FIG. 1 shows a bag 10 according to the invention with a base 20 and a valve bottom 30, into which a valve tube 12 is inserted for filling the bag. The bottoms 20, 30 are folded on the front or front wall 14 of the bag. The back or rear wall of the bag is below the front wall and Figure 1 is not visible. Stand and valve bottom 20, 30 are formed in Kreuzbodenfaltweise and each provided with a cover sheet 21, 31. Under the cover sheet 31 of the valve bottom, the contours of the side flaps 38, 39 of the valve bottom 30 are shown in dashed lines. The bag is made of two-ply paper, wherein the inner paper ply is not visible in the outside view according to FIG.

Figure 2 shows the open valve bottom 30 of a bag 10 according to the invention in Kreuzbodenfaltung, wherein no valve tube is used. The cross bottom fold forms the two corner stops 32 and 33, as well as the side flaps 38 and 39, which are closed to close the bottom to the bottom longitudinal direction extending Seitenfalzlinien 35 and 36. The distance between the two side fold lines 35 and 36 corresponds to the width of the finished, applied valve bottom 30.

FIG. 3 shows an endless paper web for producing a bag according to the invention. In dashed lines, the contour of the bottom fold is shown, with the Seitenfalzlinien 25, 35 and 26, 36, the Eckeinschlägen 22, 32 and 23, 33 and the side flaps 28, 38 and 29, 39th Figures 4 and 4a show a two-ply paper blank for the production of a bag according to the invention, in which both floors are designed according to the invention as a vent floor. At the bottom edges of the blank is a transverse bonding 40 or 40a between the two paper layers 16 and 18 of the bag, which connects the two paper layers together. In the embodiment according to FIG. 4, the transverse bond 40 is formed as a line of equidistant adhesive dots. In the variant according to FIG. 4a, the transverse bond 40a is formed by continuous glue lines. In the area of both side flaps 28, 29 and 38, 39 of the standing and the valve floor are according to the invention recesses 42 and 42a of the transverse bonding. The recesses 42 in the transverse bonding 40 are formed in Fig. 4 such that in the row of equidistant adhesive dots each account for two adhesive dots, so that in the middle of the side flaps 28, 29, 38, 39 each have an adhesive point, to the symmetrical two Connect recesses that extend approximately to the fold line of the corner fences 22, 23, 32, 33. As a result, a particularly good ventilation is achieved via the side flaps, in particular a symmetrical air outlet is possible symmetrically to the longitudinal center of the side flaps. In the embodiment according to FIG. 4a, the recesses 42a are formed such that the continuous glue line 40a has interruptions 42a in the region of the side flaps which are preferably arranged symmetrically to the longitudinal center of the side flaps.

Figures 5 and 5a show the open valve bottom 30 of a bag, which is inventively designed as a vent bottom 30, by folding from the blank shown in Figure 4 or 4a. As also shown in FIG. 4, in the embodiment according to FIG. 5 the transverse bonding 40 is designed as a line of equidistant adhesive dots. In the area of both side flaps 38 and 39, the recesses 42 are in the transverse bonding, wherein a remaining adhesive point in the longitudinal center of both side flaps comes to rest, followed by symmetrical recesses 42 on both sides, which extend approximately to the inner edge of the Eckeinschläge 32, 33 , This arrangement of the recesses a very good and symmetrical ventilation is achieved, while still good connection of the two Material layers 16 and 18 by the transverse bonding. In the embodiment according to FIG. 5a, the transverse bonding 40a is designed in the form of continuous adhesive lines. In the region of both side flaps 38 and 39 are the recesses 42 a, which extend symmetrically from the longitudinal center of the side flaps approximately up to the level of the inner edges of the Eckeinschläge 32, 33. Also in this embodiment, a very good and symmetrical ventilation is achieved.

Figures 6 and 6a show the vent plates 30 of Figure 5 and 5a in the closed state. Between the folded side flaps 38 and 39 of the designated by the arrow 37 gap remains. Because the side flaps 38 and 39 do not overlap, air can escape well from the recesses 42 in both side flaps so that air flowing in from both the front wall and the rear wall can vent well. In the design according to FIG. 6, the recesses 42 together occupy approximately 40% of the length of the edges of the side flaps facing the gap 37, and approximately 50% of the recesses 42a in FIG. 6a. The gap 37 between the side flaps also saves material compared to previously known embodiments in which the side flaps 38 and 39 overlap.

Figure 7 shows the open vent bottom of a bag according to the invention, in which an inner bar 50 is glued. Figure 8 shows a schematic representation of the laying of such a venting floor. By the inner bar 50 is achieved that the bag is closed and sealed, although after the laying of the side flaps 38 and 39, a gap between them remains.

FIGS. 9 and 9a show a closed vent bottom 30 according to the invention. Between the side flaps 38 and 39 is the gap 37 through which the underlying inner latch 50 can be seen. The inner bar 50 closes the bag interior in the area of the vent floor 30 and the inventive design of the bag allows air escaping from the bag to bypass the inner bar via the side flaps and exit through the recesses 42 or 42a in the transverse gluing 40 or 40a into the outer space , As with the arrows indicated, can escape through these recesses 42 and 42a air 60 from the space between the two layers of paper, from both side flaps. As a result, good ventilation can take place both from the region of the front wall and from the region of the rear wall of the bag, in each case symmetrically with respect to the bag center.

FIG. 10 shows the application of a cover sheet 31 to a ventilation floor 30 according to the invention. The contour of the adhesive application 54 for the bonding of the cover sheet 31 is designed such that the air outlet or the ventilation is not impaired. Preferably, the adhesive application 54 is for fixing the cover sheet on the bottom 30 to be added in the area in which are also the adhesive areas of the transverse bonding. Accordingly, there is no adhesive application for fastening the cover sheet in the region of the recesses of the transverse bonding. Thus, the exit of air 60 is affected by the attachment of the cover sheet 31 as little as possible.

Figure 1 1 shows schematically the vent in a bag 10 according to the invention on the vent bottom 30. Between the outer and inner paper layer 16, 18, the air 60 can reach the vent bottom 30 and there through the side flaps 38, 39 and the recesses in the transverse bonding in the Exit outside.

With the bag according to the invention a number of advantages are achieved. Thus, this bag allows a saving of material at the same time improved ventilation without affecting the stability and strength of the venting floor. Likewise, the invention allows outer layers of material of a multi-ply bag air and / or waterproof to design, at the same time good ventilation.

Claims

Multi-layer valve bag claims

Valve bag (10) for bulk material such as cement, gypsum, granules, animal feed o. Ä., With a floor (20) and the floor (20) opposite the valve bottom (30), wherein standing and / or valve bottom preferably as a cross or Block bottom are formed, and wherein in the valve bottom, a valve (50) for filling the valve bag (10) is incorporated, and wherein the bag is made of a two- or multi-layer blank of a sheet material, in particular paper and / or plastic, and wherein the blank along at least one of its bottom edges has a transverse bond (40, 40a) interconnecting adjacent layers of material (16, 18), characterized in that at least one of the cross-surfaced floors (20, 30) (40, 40) 40a) is designed as a vent floor, which has a bottom fold, in which flaps (28, 29, 38, 39) for bottoming around running in the bottom longitudinal direction Seitenfalzlinien (25, 26, 35, 36) are folded, wherein the side flaps are formed in width such that when the vent bottom increased a gap (37) between the Side flaps remains, and wherein the transverse bonding in the region of both side flaps of the vent floor recesses (42, 42 a) which form an outlet for out of the space between the material (16, 18) escape escaping air.

Sack (10) according to claim 1, characterized in that the recesses in the transverse bonding at least 1 cm, preferably at least 2 cm, and more preferably at least 3 cm wide.

Sack (10) according to one of the preceding claims, characterized in that the valve bottom (30) is designed as a vent bottom.

Sack according to one of the preceding claims, characterized in that the floor (20) is designed as a vent floor.

Sack (10) according to any one of the preceding claims, characterized in that the innermost material layer of an air-permeable material, preferably made of paper, is formed.

Sack (10) according to one of the preceding claims, characterized in that at least one outer layer of material consists of an air- and / or water-impermeable material, preferably of a plastic film or coated paper.

Sack (10) according to one of the two preceding claims, characterized in that the bag is formed in three layers, wherein the innermost and the outermost layer of material consist of paper, and the intermediate material layer is formed as a plastic film.

8. bag (10) according to any one of the preceding claims, characterized in that the gap between the applied side flaps of the vent base at least 1 cm, preferably at least 2 cm, and more preferably at least 3 cm wide.

9. sack (10) according to any one of the preceding claims, characterized in that the vent bottom is sealed with an inserted into the open bottom inner bar.

10. bag (10) with inner bar according to the preceding claim, characterized in that the inner bar is formed of PE-coated paper or a plastic film.

1 1. Sack (10) according to any one of the preceding claims, characterized in that the supplied vent bottom is pasted over with a cover sheet, wherein the contour of the bond has recesses and / or the cover sheet of highly porous paper, to escape the emerging through the recesses of the transverse bonding To allow air in the outside space.

12. bag (10) according to the preceding claim, characterized in that the cover sheet consists of PE-coated paper.