VALVE BAG
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.
The invention relates to a valve sack for bulk material such as cement, gypsum, pellets, animal feed, or similar having a stand-up base and a valve base disposed opposite the stand-up base. The stand-up base and/or the valve base is/are preferably formed in the manner of a cross-base or block-base fold. A valve tube is worked into the valve base and forms a valve for filling the valve sack in the region of a first corner fold of the base fold.
Such valve sacks, mostly produced from paper, are generally known and are in particular used for the packaging and distribution of fine-grain bulk material such as cement, gypsum, pellets, animal feed, or similar. The standard sizes in this respect are 5 kilos, 10 kilos and 25 kilos.
The valve base comprises a valve for placing the valve sack onto the filling spout of a filling system. The valve can be closed after the filling procedure such as with a hose-like thermal valve whose inner side is coated with a hot-melting material to weld the valve by the action of heat. Alternatively, sealable materials can be used for an inner side lining and closing of the valve hose.
A slip of paper is as a rule placed around the thermal material as a carrier material to improve the stability of the valve hose, in particular to be able to place it onto a filling spout of a filling system. Both materials here are formed so wide they both respectively overlap and consequently form two valve hoses disposed in one another on the folding closed of the side flaps.
An already known valve design is shown by way of example in
If the valve hose 7 is welded after the filling procedure at the filling system, the lower part X of the thermal material 6 areally melts with the upper part Y of the thermal material 6. The carrier material 2 only has the function of a support. A disadvantage of this design is the high material effort that is required for the valve formation. This not only causes high production costs, but is also disadvantageous in an ecological aspect.
The object of the present invention is to provide a valve sack having an improved valve that can in particular be manufactured with a smaller material effort and/or less expensively and/or more environmentally friendly.
This object is achieved by a valve sack having the features of claim 1. Advantageous embodiments of the valve sack are the subject of the dependent claims.
Starting from the valve sack forming the category, provision is made in accordance with the invention to form the valve hose from a thermal material and from a material differing therefrom, with the thermal material being able to be welded or sealed with the material differing therefrom for sealing the valve. Unlike in the prior art, two layers of the thermal material are no longer welded or sealed together to bring about a valve closure, but the thermal material is rather welded or sealed with a different material. The required amount of thermal material can be reduced by this procedure. Not only production costs can thus be saved, but the valve sack is also more environmentally friendly.
Any material that can be welded or sealed with a suitably selected different material can act as the thermal material. The thermal material can preferably be a plastic material, e.g. polyethylene (PE) or also a plastic coating.
In accordance with a preferred embodiment variant, the different material is a carrier material, in particular paper. The thermal material is applied to this carrier material in a suitable manner. The application of the thermal material is selected here, however, such that it neither overlaps nor forms a closed valve hose from thermal material on the folding closed of the side flaps of the base. The valve hose consequently comprises one or more cut-outs of the thermal material along its hose periphery. The resulting hose is thus formed from the thermal material and the carrier material, with the latter closing the cut-outs of the thermal material to complete the hose. On the closing of the valve, the thermal material is weldable or sealable with the different material or carrier material. On the welding or sealing of the valve, the valve hose is compressed so that oppositely disposed inner sides of the valve hose come into contact with one another and are welded or sealed. The thermal material and the cut-outs are advantageously distributed over the inner periphery of the valve hose such that at least one strip that runs over the entire width of the valve and along whose total length thermal material is located is produced in the contact region. A tight weld or seal is thereby made possible.
The application of the thermal material to the carrier material can take place, for example, such that it is applied to the carrier material with a still open valve base approximately symmetrically or centrally with respect to the fold lines of the side flaps of the valve base and/or approximately symmetrically or centrally with respect to the longitudinal axis of the valve base and/or centrally to the surface of the carrier material facing the sack interior. The width of the thermal material, e.g. the extent of the thermal material transversely to the valve axis, is selected here such that the end sides of the thermal material neither overlap nor close to form a hose on the folding closed. The peripheral valve region that thereby remains free of thermal material is closed by the carrier material. On the compressing and closing of the valve, the thermal material is thus welded or sealed with the carrier material disposed in the oppositely disposed cut-out.
Alternatively to this, the thermal material can also be applied to the carrier material in the open valve base at the marginal side in two or more parts, in particular in the part of the carrier material that is in the region of the side flaps of the valve base, that overlaps on the folding over of the side flaps and forms the hose, and forms its semi-periphery remote from the sack body. The carrier material area facing the sack body in this case remains free of thermal material so that there is here also a valve closure by welding or sealing the thermal material with the carrier material, with thermal material being located along a strip over the entire center of the compressed valve. The thermal material is in this case preferably terminated flush with the side edges of the carrier material.
Instead of adhesively bonding the thermal material to the carrier material, the carrier material can also be provided with a corresponding weldable/sealable coating. The carrier material can be paper or any other suitable material that can be welded/sealed with the thermal material.
Alternatively to this, the use of a separate carrier material for the valve design is not absolutely necessary. The thermal material can, for example, be applied directly to the side flaps and/or corner folds of the valve base, either by adhesive bonding of a thermal material or by a suitable coating of the corresponding base surface. The forming of the valve hose is achieved in an advantageous manner after the folding closed of the side flaps by applying a top sheet to complete the valve hose. On the closing of the valve, the thermal material is welded or sealed with the top sheet in this embodiment.
A top sheet can also be applied, in particularly adhesively bonded, to the folded-closed valve base in the previously described embodiments having a separate carrier material. In the case in which the top sheet is not required to complete the valve, it can also be designed as shortened and can preferably only project up to the outer edge of the corner fold provided with the valve. The top sheet otherwise preferably projects up to the outer valve inlet edge.
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:
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.
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
A slightly modified version of the embodiment in accordance with
A further embodiment of the valve sack in accordance with the invention is shown in
A further embodiment of the invention is shown in
The top sheet 40 is always designed up to the valve inlet edge in all the above embodiments. However, in the embodiment of
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.
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.
Type: Application
Filed: Jun 28, 2017
Publication Date: Jun 4, 2020
Inventors: Gerhard SCHULTE (Lindlar-Frielingsdorf), Eduard LISEK (Drolshagen), Thomas HILLING (Neubeckum)
Application Number: 16/314,066