VALVE BAG

Abstract

A valve sack for bulk material such as cement, gypsum, pellets, animal feed, or similar having a stand-up base, preferably a cross-base or a block base, and having a valve base that is disposed opposite the stand-up base and into which a valve hose is worked that forms a valve for filling the valve sack in the region of a first corner fold of the base fold, characterized in that the valve hose is formed from a thermal material and from a material different therefrom, with both materials being weldable or sealable with one another to close the valve.

Claims

1. A valve sack (10) for bulk material such as cement, gypsum, pellets, animal feed, or similar having a stand-up base (20), preferably a cross-base or a block base, and having a valve base (30) that is disposed opposite the stand-up base (20) and into which a valve hose (50) is worked that forms a valve (50) for filling the valve sack (10) in the region of a first corner fold (32) of the base fold, wherein the valve hose (50) is formed from a thermal material (54, 55, 56) and a material (52, 40, 41) different therefrom, with both materials (40, 41, 52, 54, 55, 56) being weldable or sealable with one another to close the valve (20).

2. A valve sack (10) in accordance with claim 1, wherein the different material is a carrier material (52) on which a thermal material (54, 55, 56) is applied, with one or more cut-outs of the thermal material (54, 55, 56) being provided over the hose periphery of the formed valve (50).

3. A valve sack (10) in accordance with claim 2, wherein the thermal material (54, 56) is applied to the carrier material (52) centrally to the center axis (37) of the valve base (30), with the applied thermal material (54, 56) neither overlapping nor closing to form a hose with a folded closed valve base (30).

4. A valve sack (10) in accordance with claim 2, wherein the thermal material (54, 55) is applied to the carrier material (52) in two or more separate regions over the valve periphery, with the thermal material regions (54, 55) preferably terminating flush with at least one side edge of the carrier material (52).

5. A valve sack (10) in accordance with claim 2, wherein the thermal material (54, 55) is adhesively bonded to the carrier material (52) or is formed by a coating (56) of the carrier material (52).

6. A valve sack (10) in accordance with claim 1, wherein the thermal material (54, 55, 56) is polyethylene and the different material (52, 40, 41) is paper.

7. A valve sack in accordance with claim 1, wherein the different material is a top sheet (40, 41) that is applied to the side flaps (38, 39) after their folding closed.

8. A valve sack in accordance with claim 7, wherein the top sheet (40, 41) extends up to the outer valve inlet edge or up to the ends (27, 27) of the side flaps 38, 39.

9. A valve sack (10) in accordance with claim 4, wherein the thermal material (54, 55) is adhesively bonded to the carrier material (52) or is formed by a coating (56) of the carrier material (52).

10. A valve sack (10) in accordance with claim 3, wherein the thermal material (54, 55) is adhesively bonded to the carrier material (52) or is formed by a coating (56) of the carrier material (52).

11. A valve sack (10) in accordance with claim 10, wherein the thermal material (54, 55, 56) is polyethylene and the different material (52, 40, 41) is paper.

12. A valve sack (10) in accordance with claim 9, wherein the thermal material (54, 55, 56) is polyethylene and the different material (52, 40, 41) is paper.

13. A valve sack (10) in accordance with claim 5, wherein the thermal material (54, 55, 56) is polyethylene and the different material (52, 40, 41) is paper.

14. A valve sack (10) in accordance with claim 4, wherein the thermal material (54, 55, 56) is polyethylene and the different material (52, 40, 41) is paper.

15. A valve sack (10) in accordance with claim 3, wherein the thermal material (54, 55, 56) is polyethylene and the different material (52, 40, 41) is paper.

16. A valve sack (10) in accordance with claim 2, wherein the thermal material (54, 55, 56) is polyethylene and the different material (52, 40, 41) is paper.

17. A valve sack in accordance with claim 11, wherein the different material is a top sheet (40, 41) that is applied to the side flaps (38, 39) after their folding closed.

18. A valve sack in accordance with claim 10, wherein the different material is a top sheet (40, 41) that is applied to the side flaps (38, 39) after their folding closed.

19. A valve sack in accordance with claim 9, wherein the different material is a top sheet (40, 41) that is applied to the side flaps (38, 39) after their folding closed.

20. A valve sack in accordance with claim 13, wherein the different material is a top sheet (40, 41) that is applied to the side flaps (38, 39) after their folding closed.

Description

[0017] Further advantages and properties of the invention will be explained in more detail in the following with reference to embodiments shown in the Figures. There are shown:

[0018] FIGS. 1a, 1b: a valve sack in accordance with the prior art;

[0019] FIGS. 2a, 2b: schematic views of a valve sack in accordance with the invention;

[0020] FIGS. 3a, 3b: representations of the valve sack in accordance with the invention with open and closed valve bases in accordance with a first embodiment;

[0021] FIGS. 4a, 4b: representations of an embodiment modified with respect to FIGS. 3a, 3b;

[0022] FIGS. 5a, 5b representations of the valve sack in accordance with the invention with open and closed valve bases in accordance with a second embodiment;

[0023] FIGS. 6a, 6b: representations of the valve sack in accordance with the invention with open and closed valve bases in accordance with a third embodiment; and

[0024] FIG. 7: a further embodiment of the valve sack in accordance with the invention with a valve base folded closed.

[0025] FIGS. 2a and 2b show the fundamental design of a valve sack 10 in accordance with the invention that has a stand-up base 20 and a valve base 30, with the valve 50 for filling the valve sack being accommodated in the valve base 30. Apart from the valve 50 in accordance with the invention, the sack shown in FIGS. 2a/b substantially corresponds to the solution known in the prior art. Both the stand-up base 20 and the valve base 30 are folded onto the front side 12 of the sack 10 in FIG. 2. The rear side of the sack which lies beneath the front side 12 cannot be recognized. A hose valve 50 in accordance with the invention is inserted into the valve base 30, and indeed in the region of the first corner fold 32 of the base fold. The hose valve 50 of the sack 10 can be placed onto the filling spout of a filling system and after the filling the hose valve can be welded in a dust-tight manner by the action of heat.

[0026] FIG. 2b shows the open valve base 30 of a sack 10 in accordance with the invention in a cross-base fold, with neither a valve hose nor a valve slip of paper nor a thermal material being inserted. The cross-base fold forms the two corner folds 32 and 33 as well as the side flaps 38 and 39 that are folded closed about the side fold lines 35 and 36 to close the base.

[0027] FIGS. 3a, 3b show a first specific embodiment of the valve 50 in accordance with the invention. To illustrate the valve design, the valve base 30 is not folded closed in FIG. 3a, but is rather shown openas in FIG. 2b. A carrier material 52, a slip of paper in the embodiment, is adhesively bonded in the open base 30, on the left corner fold 32. The sealable or weldable thermal material 54, in this case a PE slip 54, is subsequently likewise adhesively bonded in the open base 30 to the carrier material 52 centrally or symmetrically to the center axis 37 of the base 30. The PE slip 54 is of a much narrower design in relation to the prior art, i.e. is shorter in the transverse direction toward the valve axis, and only a small portion (preferably 0.5 to 1 cm) projects over the two side fold lines 35, 36 into the side flaps 38, 39.

[0028] In the example shown, the PE slip 54 has to be at least as wide as the valve base 30 between the two side fold lines 35, 36. If, however, the valve 50 is narrower than the spacing between the side fold lines 35, 36 of the valve base 30, the PE slip 54 can be narrower than the valve base 30, but must be at least as wide as the valve 50 to achieve a complete weld along the contact line of the valve pressed closed.

[0029] The valve base 30 and also the valve, i.e. the valve hose 50, are formed by folding closed the side flaps 38, 39 in accordance with the arrows a and b. The top sheet 40 that extends from the valve inlet edge up to the rear corner fold 33 is adhesively bonded to the folded closed side flaps 38, 39. The valve hose 50 is completed by the carrier material 52. The PE slip 54 can no longer overlap due to the narrower design and can thus also not form any second hose. If the valve or the valve hose 50 is welded after the filling of the valve sack 10 at the filling system, the welding does not take place, as known from the prior art, on the basis of a single material (thermal material 2 in FIGS. 1a, b), but rather on the basis of two different materials. It can be recognized in FIG. 3b that on the welding of the valve 50, the thermal material 54 at the bottom, here marked as region X, is welded to the region of the carrier material 52 disposed thereabove, marked by the reference symbol Y. The welding of two different materials brings about a high savings potential since less PE or thermal material 54 is required for the formation of a sufficiently tightly closing valve 50. This has a high cost advantage and simultaneously makes the valve sack more environmentally friendly.

[0030] A slightly modified version of the embodiment in accordance with FIGS. 3a, 3b is shown in FIGS. 4a, 4b. No PE slip 54 is here adhesively bonded to the carrier material 52, but the carrier material 52 is rather provided with a coating 56 instead. The positioning of the coating 56 is, however, identical to the positioning of the slip 54 in FIGS. 3a, 3b so that the effect achieved is identical to the embodiment of FIGS. 3a, 3b. The coating 56 is welded or sealed with the carrier material 52 to close the valve 50.

[0031] A further embodiment of the valve sack in accordance with the invention is shown in FIGS. 5a, 5b. The PE slip 54 is here not adhesively bonded to the carrier material 52 in one piece in the center of the valve base 30, but rather instead split into two separate regions 54, 55 that each terminate flush with a side edge of the carrier material 52. In this variant, the PE material 54, 55 is not at the bottom on the folding closed of the valve sack as shown in FIG. 3b, but rather at the top in the valve hose 50 instead. In this embodiment, however, the upwardly disposed PE material 54, 55 is also adhesively bonded to the carrier material 52 at the bottom in the valve hose. Instead of the adhesively bonded PE material, a coating could also be used here analog to FIGS. 4a, 4b. The top sheet 40 that extends from the valve inlet edge up to the rear corner fold 33 is also adhesively bonded to the folded closed side flaps 38, 39 here.

[0032] A further embodiment of the invention is shown in FIGS. 6a, 6b. In this embodiment, unlike in the above variants, the carrier material 54 is fully dispensed with and the PE slip 54 is instead directly adhesively bonded approximately centrally in the open base 30, in particular to the corner fold 33. In this case, the top sheet 40 that is adhesively bonded to the already folded closed side flaps 38, 39 serves as a replacement for the carrier material 54. The valve hose 50 is thus completely closed by the top sheet 40, with the thermal material 54 at the bottom being welded or sealed with the top sheet 40 on the closing of the valve 50. The top sheet 40 also extends from the valve inlet edge up to the rear corner fold 33 here.

[0033] The top sheet 40 is always designed up to the valve inlet edge in all the above embodiments. However, in the embodiment of FIGS. 6a, 6b, this only serves to weld the valve 50 or the thermal material 54. In the embodiment variants of FIGS. 3a to 5b, this can also be designed as shorter for a further material saving, as shown in FIG. 7. The top sheet 41 here only extends up to the ends 31, 31 of the side flaps 38, 39.

[0034] The described embodiments use a PE material as the thermal material; however, other weldable or sealable materials are equally conceivable. The carrier material or the top sheet also does not necessarily have to be of paper, but can alternatively be produced from a different material.