Ventilatable valve bag

Abstract

The invention relates to a ventilatable valve bag with a wall material (4) comprising at least one gas-permeable inner layer (6) that is impermeable to a filler material and at least one gas-impermeable outer layer (8) as well as two closing sides (10), a first closing side (10) being formed by closing the valve bag (2) and a second closing side (10) being arranged opposite the first closing side (10). An intermediate space (14) is formed between a part of the inner layer (6) defining an inner space (12) of the bag and the outer layer (8), and at least one ventilation channel (18) leading out of a wall material edge section (16) is arranged on at least one closing side (10) of the valve bag (2), between the inner layer (6) and the outer layer (8) of a wall material region, such that the intermediate space (14) can be ventilated to the surroundings.

Claims

1. A ventilatable valve bag comprising: a wall material fixed by a longitudinal seam connecting two sides of the wall material to form a circumferentially closed hose, the wall material consisting of an inner plastic film layer, permeable to gas and impermeable to a fill material, and of an outermost plastic film layer impermeable to gas and exposed to an environment of the ventilatable bag, wherein a part of the inner plastic film layer delimits circumferentially all around a bag interior of the ventilatable valve bag; a first closure side and a second closure side, wherein the first closure side is formed by closing the ventilatable valve bag and the second closure side is arranged facing away from the first closure side; an intermediate space formed between the part of the inner plastic film layer delimiting circumferentially all around the bag interior of the ventilatable valve bag and the outermost plastic film layer, wherein the intermediate space extends circumferentially from one side of the longitudinal seam to the other side of the longitudinal seam around the bag interior, and wherein the part of the inner plastic film layer delimiting circumferentially all around the bag interior comprises venting openings permitting gas to pass from the bag interior into the intermediate space; at least one venting channel arranged on the first closure side and/or the second closure side between the inner plastic film layer and the outermost plastic film layer of a wall material region of the wall material, wherein the at least one venting channel opens at a wall material rim section of the wall material and is configured to ventilate the intermediate space toward the environment of the ventilatable valve bag; wherein the at least one venting channel is embodied in an outer lateral flap forming a part of the first closure side or of the second closure side.

2. The ventilatable valve bag according to claim 1, wherein the first closure side and/or the second closure side is embodied by folding the wall material.

3. The ventilatable valve bag according to claim 2, wherein the first closure side and/or the second closure side is a cross bottom.

4. The ventilatable valve bag according to claim 1, wherein the outer lateral flap is a part of a cross bottom that forms the first closure side or the second closure side.

5. The ventilatable valve bag according to claim 4, wherein the outer lateral flap comprises the wall material rim section and the wall material rim section adjoins the environment.

6. The ventilatable valve bag according to claim 1, wherein a central longitudinal axis of the at least one venting channel extends substantially parallel to a narrow edge of the first closure side or the second closure side.

7. The ventilatable valve bag according to claim 1, wherein the inner plastic film layer and the outermost plastic film layer are formed of the same material.

8. The ventilatable valve bag according to claim 7, wherein the inner plastic film layer and the outermost plastic film layer are formed primarily of a polyolefin.

9. The ventilatable valve bag according to claim 8, wherein the polyolefin is polyethylene.

10. The ventilatable valve bag according to claim 1, further comprising spacer elements that define the intermediate space by spacing apart the outermost plastic film layer and the part of the inner plastic film layer delimiting the bag interior of the ventilatable valve bag.

11. The ventilatable valve bag according to claim 10, wherein the spacer elements are formed by rims of the venting openings.

12. The ventilatable valve bag according to claim 1, further comprising spacer elements that define the intermediate space by spacing apart the outermost plastic film layer and the part of the inner plastic film layer delimiting the bag interior of the ventilatable valve bag.

13. The ventilatable valve bag according to claim 1, further comprising a cover sheet arranged on the first closure side or the second closure side, wherein the cover sheet covers the wall material rim section and forms partially the at least one venting channel.

14. The ventilatable valve bag according to claim 13, further comprising a cover element arranged between the first closure side or the second closure side and the cover sheet, wherein the cover element extends from the wall material rim section to a rim of the cover sheet.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Further details and advantages of the invention can be taken from the embodiments described in following and schematically illustrated; it is shown in:

(2) FIG. 1 a perspective illustration of a part of an embodiment of a valve bag according to the invention;

(3) FIG. 2 a perspective illustration of a closure side of a further embodiment of a valve bag according to the invention;

(4) FIG. 3 a perspective illustration of a wall material blank for producing the embodiment of the valve bag of FIG. 1 in accordance with the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS

(5) The features of the embodiments according to the invention explained in the following can also be subject matter of the invention individually or in other combinations than illustrated or described, however always at least in combination with the features of the independent claim. Functionally same acting parts are provided with identical reference characters, if expedient.

(6) FIG. 1 shows a closure side 10, a lateral side 30 as well as a main side 28 of a ventilatable valve bag 2 in a perspective illustration, wherein a longitudinal seam L connects two sides of a wall material 4 to a hose shape. The illustration of the valve bag 2 is sectioned in the lower region. A wall material 4 of which the valve bag 2 is substantially embodied comprises an outer layer 8 visible from the exterior and an inner layer 6 at the inner side that is contacting and/or adjoining the outer layer 8 and in FIG. 1 is made visible by a partially sectioned view of the main side 28.

(7) FIG. 3 is a perspective illustration of a valve bag blank that is not yet closed. It is comprised of a hose-shaped wall material 4 with longitudinal seam L connecting two sides of the wall material 4. By closing the valve bag blank or the valve bag 2 formed thereof, a bag interior 12 is defined which is indicated in FIG. 3 as a result of the open state of the valve bag blank. Between a part of the inner layer 6 which delimits the bag interior 12 and the outer layer 8, there is an intermediate space 14. In the illustrated embodiment according to FIG. 1, the latter is at the main surface between the inner layer 6 and the outer layer 8. The inner layer 6 is in this context permeable to gas and impermeable to the fill material which is to be filled into the bag interior 12. This is achieved by a plurality of venting openings 36 (compare FIG. 1) which are identified by dots which are provided in the inner layer 6 and which are partially shown enlarged. The outer layer 8 which delimits the intermediate space 14 at the side facing the environment is in this context impermeable to gas as well as to the fill material. The intermediate space 14 can extend completely or partially across two main sides 28 and two lateral sides 30.

(8) At the closure side 10 illustrated in FIG. 1, the ventilatable valve bag 2 has an outflow opening 34 into which a venting channel 18 opens. This venting channel 18 connects the intermediate space 14 and the environment so that air from the intermediate space 14 can flow through the venting channel 18 to the environment. The outflow opening 34 is positioned in this context in a wall material rim section 16 in which the inner layer 6 and the outer layer 8 of a wall material region are spaced apart from each other.

(9) The closure side 10 of the ventilatable valve bag 2 is embodied by folding the wall material 4 to a cross bottom. This cross bottom has a lateral flap that is inwardly positioned and therefore only visible to a smaller extent at a real valve bag and an outer lateral flap 20. The wall material rim section 16 in which the outflow opening is positioned is part of this outer lateral flap 20. Moreover, the wall material rim section, regardless of the cover sheet or the like which is possibly applied to the closure side 10, adjoins immediately the environment.

(10) The venting channel 18 extends from the wall material rim section 16 substantially in the direction of its central longitudinal axis 22 to a wide edge 26 of the closure side 10 where the wall material 4 is folded and where the outer lateral flap 20 adjoins a main side 28. The central longitudinal axis 22 of the venting channel 18, which at any location along the closure side 10 has a substantially identical spacing to the two transversely and parallel extending venting channel transverse boundaries, extends in this context parallel to the two narrow edges 24 of the closure side 10 (compare FIG. 1).

(11) FIG. 3 shows that the inner layer 6 and the outer layer 8 are connected to each other at the closure side along a wall material rim strip 32 which adjoins the wall material rim and has a constant width along the circumference of the valve bag blank. This connection of the inner layer 6 and of the outer layer 8 at the closure side is interrupted in the section of the wall material rim strip 32 which adjoins the wall material rim section 16 in order to form the outflow opening 34 where the inner layer 6 and the outer layer 8 are spaced apart from each other.

(12) FIG. 2 shows a closure side 10 of a different embodiment of the valve bag according to the invention. A transparent cover sheet 38 whose lateral rim is substantially corresponding to the narrow edges 24 and the wide edges 26 of the closure side 10 is applied onto the illustrated closure side 10. The cover sheet 38 is glued to the closure side 10.

(13) The outer lateral flap 20 does not extend from a wide edge 26 to the oppositely positioned one so that the outflow opening 34 is located between both wide edges 26 at the closure side 10. Because the applied cover sheet 38 is glued to the closure side 10, the venting channel 18 is embodied from the outflow opening 34 to the closer wide edge 26 by the cover sheet. In this region, the venting channel 18 extends between the cover sheet 38 and the inner lateral flap outside of the wall material 4. It is formed by a cover element 40 in the region marked correspondingly by dashed lines.

LIST OF REFERENCE CHARACTERS

(14) 2 valve bag 4 wall material 6 inner layer 8 outer layer 10 closure side 12 bag interior 14 intermediate space 16 wall material rim section 18 venting channel 20 outer lateral flap 22 central longitudinal axis 24 narrow edge 26 wide edge 28 main side 30 lateral side 32 wall material rim strip 34 outflow opening 36 venting opening 38 cover sheet 40 cover element