WO2018001562A1

WO2018001562A1 - Valve bag

Info

Publication number: WO2018001562A1
Application number: PCT/EP2017/000769
Authority: WO
Inventors: Gerhard Schulte; Eduard Lisek; Thomas Hilling
Original assignee: Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh
Priority date: 2016-06-29
Filing date: 2017-06-28
Publication date: 2018-01-04
Also published as: MX2018016083A; BR112018077292A2; DE202016004073U1; US20200172296A1; EP3478596B1; EP3478596A1; ZA201900238B; CN109476405A

Abstract

The invention relates to a valve bag for bulk goods such as cement, gypsum, granular material, animal feed, or the like, comprising a standing bottom, preferably a cross bottom or block bottom, and comprising a valve bottom lying opposite the standing bottom, into which valve bottom a valve tube is incorporated, which forms a valve for filling the valve bag in the region of a first corner tuck of the bottom fold, characterized in that the valve tube is formed of a thermal material and a material deviating therefrom, wherein the two materials can be welded or sealed to each other in order to close the valve.

Description

valve bag

The invention relates to a valve bag for bulk material such as cement, gypsum, granules, animal feed or the like, with a floor and a floor standing opposite the valve floor. Preferably, standing and / or valve bottom are formed in a cross or block bottom folding manner. In the valve bottom, a valve tube is incorporated, which forms a valve for filling the valve sack in the region of a first Eckeinschlages the bottom fold.

Such valve bags, mostly made of paper, are well known and are used in particular for the packaging and distribution of fine-grained bulk material such as cement, gypsum, granules, animal feed or the like. The usual sizes are 5 kilos, 10 kilos and 25 kilos.

The valve bottom comprises a valve for attaching the valve bag to the filler neck of a bottling plant. After filling, the valve can be closed, such. Example, in a tubular thermo valve whose inside is coated with a hot-melt material to the valve by acting to be welded by heat. Alternatively, sealable materials can be used for lining the inside and closing the valve tube.

To improve the stability of the valve tube, in particular in order to be able to attach it to a filling support of a filling plant, a paper slip is laid as a carrier material around the thermal material on a regular basis. Both materials are designed so wide that both overlap when assigning the side flaps of the valve bottom and thus form two valve hoses lying one inside the other.

By way of example, a previously known valve construction is shown in FIGS. 1 a and b. In this case, a carrier material 2 is glued as a note in the open valve bottom 3 and subsequently applied a thermal material 6 in the open bottom 3 on the substrate 2. Both materials are designed so wide that they overlap each other after the assignment of the side flaps 4, 4 'according to the arrows a and b and form the valve tube 7 with two nested tube layers.

If the valve tube 7 is welded to the filling plant after the filling process, the lower part X of the thermal material 6 merges with the upper part Y of the thermal material 6. The carrier material 2 has an exclusively supporting function. A disadvantage of this design is the high cost of materials necessary for valve formation. This not only causes high production costs, but is also unfavorable from an ecological point of view.

The object of the present invention is to propose a valve bag with an improved valve, which can be produced in particular with less material and / or cost and / or environmentally friendly. This object is achieved by a valve bag with the features of claim 1. Advantageous embodiments of the valve bag are the subject of the dependent claims.

Starting from the generic type valve bag is inventively designed to form the valve tube of a thermal material and a deviating material, wherein for closing the valve, the thermal material with the deviating material is welded or sealed. Unlike in the prior art, therefore, two layers of the thermal material are no longer welded together or sealed in order to bring about a valve closure, but the thermal material is welded or sealed to a different material. By doing so, the required amount of thermal material can be reduced. This not only reduces production costs but also makes the valve bag more environmentally friendly.

Any material which can be welded or sealed with a suitably chosen deviating material can function as the thermal material. Preferably, the thermal material may be a plastic material, e.g. As polyethylene (PE) act, or even a plastic coating.

According to a preferred embodiment, the deviating material is a carrier material, in particular paper. On this substrate, the thermal material is applied in a suitable manner. However, the application of the thermal material is chosen so that this neither overlaps when putting the side flaps of the bottom nor forms a closed valve tube made of thermal material. As a result, the valve tube includes one or more recesses of the thermal material over its circumference. The resulting tube is thus formed from the thermal material and the carrier material, the latter closing the recesses of the thermal material to complete the tube. When closing the valve, the thermal material can be welded or sealed with the deviating material or carrier material. When welding or sealing the valve, the valve hose is presses, so that opposite inner sides of the valve tube come into contact with each other and are welded or sealed. The thermal material and the recesses are advantageously distributed over the inner circumference of the valve tube such that at least one strip extending over the entire width of the valve results in the contact region, along the entire length of which thermal material is located. This allows a tight seal or seal.

The application of the thermal material to the carrier material may, for example, be such that it is applied approximately symmetrically or centrally with respect to the fold lines of the side flaps of the valve bottom and / or approximately symmetrically or centrally to the longitudinal axis of the valve bottom on the carrier material with the valve bottom still open is, and / or centrally on the inside of the bag facing surface of the carrier material. The width of the thermal material, z. B. the extent of the thermal material transverse to the valve axis is chosen so that the end sides of the thermal material when put neither overlap nor close to a tube. The valve circumference area, which remains free of the thermal material, is closed by the carrier material. When compressing and closing the valve thus the thermal material is welded or sealed with the lying in the opposite recess carrier material.

Alternatively, the thermal material in the open valve bottom can also be applied on the edge of the substrate in two or more parts, in particular in the part of the carrier material located in the region of the side flaps of the valve bottom, which overlaps when the side flaps are closed and forms the tube and its from the bag body opposite half-circumference forms. The sack body facing carrier material surface remains in this case free of thermal material, so it comes here to a valve closure by welding or sealing the thermal material with the substrate, which along a strip over the entire center of the compressed Ven- tils thermo material is located. Preferably, in this case, the thermal material is flush with the side edges of the carrier material.

Instead of sticking the thermal material onto the carrier material, the carrier material can also be provided with a corresponding weldable / sealable coating. The backing material may be paper or other suitable material that can be welded / sealed to the thermal material.

Alternatively, the use of a separate carrier material for the valve construction is not mandatory. For example, the thermal material can be applied directly to the side flaps and / or corner impacts of the valve bottom, either by gluing a thermo material or suitable coating of the corresponding floor surface. The formation of the valve tube is achieved after the laying of the side flaps advantageously by applying a cover sheet to complete the valve tube. When closing the valve, the thermal material is welded or sealed with the cover sheet in this embodiment.

Also in the previously described embodiments with a separate carrier material, a cover sheet can be applied to the added valve bottom, in particular adhesively bonded. In the case in which the cover sheet is not needed to complete the valve, this can also be designed shortened and preferably protrude only to the outer edge of the provided with the valve Eckeinschlages. Otherwise, the cover sheet preferably protrudes to the outer valve inlet edge.

Further advantages and features of the invention are explained in more detail below with reference to embodiments illustrated in the figures. Show it:

Figure 1a, 1 b: a valve bag according to the prior art;

2a, 2b: schematic views of a valve bag according to the invention, 3a, 3b: representations of the valve bag according to the invention with open and closed valve bottom according to a first embodiment;

FIGS. 4a, 4b: representations of the embodiment modified with respect to FIGS. 3a, 3b;

5a, 5b representations of the valve bag according to the invention with open and closed valve bottom according to a second embodiment;

Figures 6a, 6b: representations of the valve bag according to the invention with open and closed valve bottom according to a third embodiment;

Figure 7: a further embodiment of the valve bag according to the invention with the valve bottom added.

Figures 2a and 2b show the basic structure of a valve bag 10 according to the invention, which has a floor 20 and a bottom plate 30, wherein in the valve bottom 30, the valve 50 is accommodated for filling the valve bag. Apart from the valve 50 according to the invention, the sack shown in FIG. 2 a / b corresponds substantially to the solution known in the prior art. In FIG. 2, both the floor 20 and the valve bottom 30 are folded onto the front side 12 of the bag 10. Not recognizable is the back of the bag, which lies under the front 12. In the valve bottom 30, an inventive tube valve 50 is used, in the region of the first Eckeinschlages 32 of the bottom fold. With the hose valve 50, the bag 10 can be attached to the filler neck of a bottling plant, and after filling the tube valve can be welded dust-tight by the action of heat. FIG. 2b shows the open valve bottom 30 of a sack 10 according to the invention in cross-bottom fold, wherein neither a valve hose or sheet nor a thermo material are used. The cross bottom fold forms the two corner wefts 32 and 33, as well as the side flaps 38 and 39, which are closed to close the bottom to the Seitenfalzlinien 35 and 36.

FIGS. 3a, 3b show a first concrete embodiment of the valve 50 according to the invention. To illustrate the valve structure, the valve bottom 30 is not folded in FIG. 3a, but - as shown in FIG. 2b - shown open. A carrier material 52, in the exemplary embodiment a paper slip, is glued into the open bottom 30, on the left Eckeinschlag 32. Subsequently, the sealable or heat-sealable heat-resistant material 54, in this case a PE label 54, is also adhesively bonded in the open bottom 30 in the middle or symmetrical to the central axis 37 of the bottom 30 onto the carrier material 52. The PE slip 54 is significantly narrower in relation to the prior art, i. made shorter in the transverse direction to the valve axis and protrudes into the side flaps 38, 39 only to a small extent (preferably 0.5 to 1 cm) over the two Seitenfalzlinien 35, 36.

In the illustrated embodiment, the PE sheet 54 must be at least as wide as the valve bottom 30 between the two Seitenfalzlinien 35, 36. However, if the valve 50 is narrower than the distance between the Seitenfalzlinien 35, 36 of the valve bottom 30, the PE slip 54 be made narrower than the valve bottom 30, but must be at least as wide as the valve 50 to achieve a complete weld along the line of contact of the pressed valve.

By assigning the side flaps 38, 39 according to the arrows a and b, the valve bottom 30 and thereby the valve, ie the valve tube 50 is formed. On the added side flaps 38, 39, the cover sheet 40 is glued, which extends from the valve inlet edge to the rear Eckeinschlag 33. The valve tube 50 is completed by the substrate 52. The PE label 54 can not overlap due to the narrower design and thus also form no second tube. If the valve or the valve tube 50 after filling the Valve bag 10 is welded to the filling, the welding is not, as known from the prior art, based on a single material (thermal material 2 in Fig. 1a, b), but instead of two different materials. It can be seen in FIG. 3b that, when the valve 50 is welded, the underlying thermal material 54, designated here as region X ', is welded to the overlying region of the carrier material 52, identified by the reference symbol Y'. The welding of two different materials has a high potential for savings, since less PE or thermal material 54 is required for the formation of a valve 50 which seals sufficiently tightly. This has a high cost advantage and makes the valve bag at the same time environmentally friendly.

A slightly modified version of the embodiment according to FIGS. 3a, 3b is shown in FIGS. 4a, 4b. In this case, no PE slip 54 is adhered to the carrier material 52, but instead the carrier material 52 is provided with a coating 56. However, the positioning of the coating 56 is identical to the positioning of the sheet 54 in Figures 3a, 3b, and therefore the effect achieved is identical to the embodiment of Figure 3a, 3b. To close the valve 50, the coating 56 is welded or sealed to the carrier material 52.

A further embodiment of the valve bag according to the invention is shown in FIGS. 5a, 5b. Here, the PE label 54 is not glued in one piece in the middle of the valve bottom 30 to the substrate 52, but instead divided into two separate areas 54, 55, each flush with a side edge of the substrate 52. In this variant, the PE material 54, 55 is not at the bottom as shown in the figure 3b, but instead at the top in the valve tube 50. However, in this embodiment, the overhead PE material 54, 55 with the bottom of the valve tube bonded carrier material 52. Instead of the glued PE material could also be used here with a coating analogous to Figures 4a, 4b. Also Here, the cover sheet 40 is glued to the added side flaps 38, 39, which extends from the valve inlet edge to the rear corner 33.

Another embodiment of the invention is shown in Figures 6a, 6b. In this embodiment, unlike in the above variants, the carrier material 54 is completely dispensed with and the PE label 54 instead is glued directly approximately in the middle in the open bottom 30, in particular on the corner wedge 33. In this case, the cover sheet 40, which is glued onto the already attached side flaps 38, 39, serves as a replacement for the carrier material 54. The valve tube 50 is thus completely closed by the cover sheet 40, wherein when closing the valve 50, the underlying thermal material 54 is welded to the cover sheet 40 and sealed. Again, the cover sheet 40 extends from the valve inlet edge to the rear corner 33rd

In all the above embodiments, the cover sheet 40 is always executed up to the valve inlet edge. However, this serves only in the embodiment of Figure 6a, 6b to weld the valve 50 and the thermal material 54. In the case of the embodiment variants of FIGS. 3 a to 5 b, this can also be made shorter for further material savings, as shown in FIG. Here, the cover sheet 41 extends only to the ends 31, 31 'of the side flaps 38, 39th

The described embodiments use a PE material as the thermal material, but other weldable or sealable materials are equally conceivable. Also, the carrier material or the cover sheet does not necessarily have to be made of paper, but may alternatively be made of a different material.

Claims

claims

1. Valve bag (10) for bulk material such as cement, gypsum, granules, animal feed o. Ä., With a floor (20), preferably a cross or block bottom, and with the floor (20) opposite the valve base (30), in a valve tube (50) is incorporated, which forms a valve (50) for filling the valve bag (10) in the region of a first corner entry (32) of the bottom fold,

characterized,

in that the valve tube (50) is formed from a thermal material (54, 55, 56) and a different material (52, 40, 41), wherein both materials (40, 41, 52, 54, 55, 56) for closing the Valve (20) are welded or sealed together.

2. Valve bag (10) according to claim 1, characterized in that the deviating material is a carrier material (52) on which a thermal material (54, 54 55, 56) is applied, wherein one or more recesses of the thermal material (54, 55, 56) over the circumference of the formed valve (50) are provided.

3. Valve bag (10) according to claim 2, characterized in that the Thermomatenal (54, 56) centrally to the central axis (37) of the valve bottom (30) on the carrier material (52) is applied, wherein the applied Thermoma- material (54 , 56) neither overlaps nor closes to a hose when the valve bottom (30) is in the elevated position.

4. Valve bag (10) according to claim 2, characterized in that the thermo- maternal material (54, 55) over the valve circumference in two or more separate areas on the carrier material (52) is applied, wherein the thermo-material areas (54, 55 ) preferably flush with at least one side edges of the carrier material (52).

5. Valve bag (10) according to any one of the preceding claims 2 to 4, characterized in that the thermal material (54, 55) is glued to the carrier material (52) or by a coating (56) of the carrier material (52) is formed.

6. Valve bag (10) according to any one of the preceding claims, characterized in that the thermal material (54, 55, 56) polyethylene and the deviating material (52, 40, 41) is paper.

7. Valve bag according to one of the preceding claims, characterized in that the deviating material is a cover sheet (40, 41) which is applied after the laying of the side flaps (38, 39) on this.

8. Valve bag according to claim 7, characterized in that the cover sheet (40, 41) to the outer valve inlet edge or to the ends (27, 27 ') of the side flaps 38, 39 extends.