DK3016870T3

DK3016870T3 - valve bag

Info

Publication number: DK3016870T3
Application number: DK14736614.0T
Authority: DK
Inventors: Eduard Lisek; Gerhard Schulte
Original assignee: Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh
Priority date: 2013-07-01
Filing date: 2014-06-24
Publication date: 2017-05-22
Also published as: ES2630376T3; SA515370110B1; EP3016870A1; BR112015030567A2; JP2016528113A; WO2015000559A1; PL3016870T3; MX2015016542A; BR112015030567B1; DE202013005898U1; US20160368666A1; CN105452117A; CN105452117B; MX370403B; EP3016870B1; MY182198A; JP6352410B2

Description

The invention relates to a valve bag in accordance with the preamble of claim 1 such as is known from utility model DE 88 05 092.

Such valve bags, typically produced from paper, are generally known and are widely used in commerce for fine-grain bulk material such as cement, gypsum, granúlate, animal feed or similar. The standard sizes in this respect are 5 kg, 10 kg and 25 kg.

The valve bottom comprises a hose-like thermo valve whose inner side is coated with a hot-melting material and which can melt by the action of heat and can cióse the valve hose. The thermo material, however, does not provide any sufficient stiffness and strength to be able to plug the valve hose onto a filler nozzle of a filling plant. A slip of paper is additionally placed around the thermo material for reinforcement for this purpose. A corresponding valve bottom is sketched in Figure 1. The Figure shows the valve bottom 2 of the valve bag 1 which is folded onto the front side of the valve bag 1. The valve bottom 2 is open to ¡Ilústrate the valve structure. The whole valve bag 1 has a fold of a cross-bottom type.

The valve 5 substantially comprises the thermo material 6 which forms the inner side of the valve hose and which is adhered to the carrier material 7. It can be recognized that the thermo material 6 takes up a larger area proportion with respect to the carrier material 7. The thermo material area in particular projects beyond the inner edge of the carrier material 7 in the axial valve direction, i.e. in the direction of the inwardly disposed valve end. The thermo material 6 consequently forms the main component of the valve hose 6 and the comparatively high unit price of the thermo material 6 causes high production costs for the valve hose 5 and for the valve bag 1.

It is the object of the present invention to optimize the cost ratio of the materials used and to lower the cost effort overall for the manufacture of a valve bag having a thermo valve.

This object is achieved by a valve bag in accordance with the features of claim 1. Advantageous embodiments of the valve bag are the subject of the dependent claims.

The reduction of the manufacturing costs should be achieved by the reduction of the required thermo material. In accordance with the invention, the area proportion of the thermo material is therefore selected as smaller with respect to the area proportion of the carrier material.

In accordance with the invention, the thermo material area is shorter in the axial valve direction with respect to the carrier material area. The larger material proportion of the resulting valve hose is thereby mainly determined by the natural carrier material, in particular paper. The chemically treated, and typically high-cost thermo material consequently only takes up a smaller material proportion. The manufacturing costs can thereby be reduced, which is in particular noticeable in products with high volumes. The desired valve properties, in particular its leak-tightness and handling, can be ensured despite the changes of the material proportions of the individual valve components.

Particularly preferably the thermo material is shortened with respect to the embodiment in the prior art, whereas the carrier material is extended accordingly.

The thermo material area is preferably shortened toward the inner end of the valve hose. Since the thermo material area and the carrier material area typically represent rectangular areas whose lengths define the valve hose periphery and whose widths determine the valve length, a shortening of the thermo material takes place by a reduction of the width of the thermo material area, i.e. in the axial valve direction. The area proportion is in particular reduced in the región of the valve hose end disposed inwardly in the valve bag body.

It is particularly advantageous if the resulting valve hose has an almost constant strength or stiffness in the axial direction. A constant strength is desirable and necessary ¡n order not to destroy the valve after the plugging of the valve hose onto the filler nozzle of the filling plant and after the subsequent strain by an inflatable cuff. A constant strength was previously ensured by the use of the thermo material as the main component of the valve hose. In the variant in accordance with the invention, the now overhanging región of the carrier material is designed as reinforced in order nevertheless to be able to ensure a constant strength in the axial valve direction.

In accordance with the invention, the carrier material is folded over in the overhanging región, in particular over the total width, i.e. over the complete valve periphery at the inner valve end. The strength in this región is increased, in particular doubled, by the folding over of the carrier material. A largely constant strength is thereby achieved in a particularly simple manner over the total length of the valve. In addition, an improvement of the backward compatibility with existing filling plants can be achieved in a simple manner.

Further advantages and properties of the invention will be explained in the following with reference to the embodiments shown in the drawings. There are shown:

Figure 1: a sketched representation of a valve bag in accordance with the prior art;

Figure 2: a sketched representation of the valve bag in accordance with the invention;

Figures 3a, b: a first example for the folding over of the carrier material with a valve bag in accordance with the invention; and

Figures 4a, b: a second example for the folding over of the carrier material with a valve bag in accordance with the invention.

The representation of Figure 2 shows the valve bag in accordance with the invention with the shortening in accordance with the invention of the thermo material used. Beside the modified valve hose, the design of the valve bag substantially corresponds to the solution known from the prior art.

The Figure representation shows the valve bag 10 in accordance with the invention with a standing bottom 20 folded to the front at the lower end and a valve bottom 30 at the upper end. Both bottoms 20, 30 are connected to one another via the front side 40 and a rear side, not shown, and are folded in the manner of a cross bottom. The valve bottom 20 is not shown folded closed, but rather open, to ¡Ilústrate the valve structure.

In a similar manner to the prior art, the valve hose 50 projects beyond the upper córner and lower córner of the valve bottom 20 on the left valve bottom side. The valve hose 50 is also composed of a thermo material 60 here, a weldable plástic material, and of a carrier material 70, for example paper, wherein the thermo material 60 envelopes the inner surface of the valve hose 50 and the carrier material 70 envelopes the thermo material 60. With this valve hose 50, the valve bag 10 can be plugged onto a filler nozzle of a filling machine for filling. After the filling process, the thermo valve 50 is welded by the effect e.g. of ultrasound energy, whereby the valve hose 50 is reliably closed.

The proportions of the used valve materials 60, 70 are modified with respect to the known embodiment of Figure 1 to lower the unit prices per manufactured valve bag 10. In accordance with the invention, the main component of the valve hose is now formed by the natural carrier material 70. The otherwise larger material proportion of the chemically treated thermo material 60, weldable plástic material, has been reduced.

Both the carrier material 70 and the thermo material 60 have a rectangular shape whose long sides extend transversely to the axial direction of the valve hose 50. Figure 2 shows the valve bottom 20 in the open State. The valve hose 50 is shaped by the rectangular materials 60, 70 folded in over the length by folding the valve bottom 20. Το save product costs, the width of the thermo material 60 is shortened and the carrier material 70 is in turn widened. The total valve length Y is not changed due to the equal shortening/widening of the valve materials 60, 70. Nevertheless, a substantial portion of the thermo material 60 can be saved, which not only brings about advantages in an economic respect, but rather also appears sensible in an ecological respect since e.g. the required energy effort in the manufacture of the thermo material and its disposal is reduced.

To be able to ensure a strength of the valve hose 50 which is as constant as possible over the total valve length Y, the overhanging región X of the carrier material 70 is reinforced by folding over in accordance with the invention since the thermo material 60 otherwise contributing to the reinforcement is missing in this región. In the specific embodiment of Figure 2, the overhanging margin X of the carrier material 70 is folded over for this purpose to achieve a sufficient strength in this región. A double-layer carrier material 70 that has approximately the same strength valúes as the multilayer región of thermo material 60 and carrier material 70 is gained by the folding over in the región not coated with thermo material. The carrier layer 70 can naturally also be folded over a múltiple of times.

Figures 3a, b and 4a, b show by way of example possibilities for the implementation of the above-described folding over of the carrier material 70. Figure 3b shows a section through the carrier material 70 and the thermo material 60 along the line A-A in Figure 3a. As shown in Figure 3b, the carrier material 70 is folded over downwardly in the región of the carrier material overhang X, that is onto the side remóte from the thermo material 60. The carrier material is two-ply and thereby reinforced in the overhanging región X by the folding over.

Figures 4a, b show a different embodiment of the folding over, with Figure 4b again showing a section along the line A-A in Figure 4a. As can be seen in Figure 4b, the carrier material 70 is folded over upwardly in the región of the overhang X, that is onto the side facing the thermo material 60. At the same time, the folding over of the carrier material and the thermo material 60 is effected in an abuttinq manner.

Claims

1. A valve bag (10) for bulk material, such as cement, gypsum, granulate, animal feed and the like, with a standing bottom (30), preferably a cross or block bottom, and with a valve bottom (20) facing it standing bottom (30) and into which is fitted a valve hose (50) for filling the valve bag (10), wherein the valve hose (50) is formed of a thermo material (60) in the form of a weldable plastic material and a carrier material (70). enclosing the thermo material (60), wherein the surface area of the thermo material (60) is smaller than the surface area of the support material (70), characterized in that the area of the support material (70) extending beyond the thermo material (60) is reinforced where the support material ( 70) is turned around for reinforcement.

Valve bag (10) according to claim 1, characterized in that the thermal material surface is shorter in axial valve direction than the carrier material surface.

Valve bag (10) according to claim 2, characterized in that the thermo-material surface in the area at the end of the valve hose facing the interior of the bag is shortened in relation to the carrier material (70).

Valve bag (10) according to one of the preceding claims, characterized in that the carrier material (70) consists of paper.

Valve bag (10) according to one of the preceding claims, characterized in that the carrier material (70) is wrapped around the end of the valve facing the interior of the bag along the entire circumference of the valve.