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Sack For Liquid And Pulverulent Substances Comprising A Soluble Surface Portion, Method and Use Therewith, And Use Of A Soluble Surface Portion

20200095040 ยท 2020-03-26

    Inventors

    Cpc classification

    International classification

    Abstract

    The present invention relates to a sack for liquid or pulverulent materials having an areal section (F) composed of a water-soluble polymer, wherein dissolution of the water-soluble polymer gives rise to an opening through which the sack can be emptied, to a sack according to the invention that contains a liquid or pulverulent material, to a method for the emptying thereof and the production thereof, and also to the use of the sack for the packing of liquid or pulverulent materials and to the use of an areal section (F) composed of a water-soluble polymer as part of a sack for liquid or pulverulent materials for the reduction of the release of unpleasant odors and/or harmful substances into the air, especially for the reduction of the release of alveoli-reaching dusts.

    Claims

    1. A sack for liquid or pulverulent materials having a portion composed of water-insoluble paper and/or water-insoluble polymer and an areal section (F) composed of a water-soluble polymer, the areal section (F) being in direct contact with the filling material of the sack, wherein dissolution of the water-soluble polymer gives rise to an opening through which the sack can be emptied.

    2. The sack according to claim 1, wherein the areal section (F) is situated entirely in the upper half or the lower half of the sack, based on the height of the sack when the sack is upright and is viewed horizontally.

    3. The sack according to claim 1, wherein the areal section (F) is situated entirely in the upper quarter or the lower quarter of the sack, based on the height of the sack when the sack is upright and is viewed horizontally.

    4. The sack according to claim 1, wherein the areal section (F) is situated on the upper side or the bottom area of the sack.

    5. The sack according to any of the preceding claims claim 1, wherein the bottom area of the sack consists of a water-insoluble paper and/or water-insoluble polymer and the areal section (F), the areal section (F) accounting for more than 11.5% and not more than 75% of the bottom area of the sack.

    6. The sack according to claim 1, wherein the areal section (F) accounts for not more than 35% of the surface area of the sack.

    7. The sack according to claim 1, wherein the water-soluble polymer is selected from polyvinyl alcohol homopolymers or copolymers and partially hydrolyzed polyvinyl alcohol homopolymers or copolymers.

    8. The sack according to claim 1, wherein the water-insoluble paper is selected from recycled paper or kraft paper and the water-insoluble polymer is selected from polypropylene, polyacrylate, polyethylene terephthalate or polyethylene.

    9. The sack according to claim 1, wherein the areal section (F) consists of a film having a film thickness of more than 40 m to 200 m.

    10. The sack according to claim 1, wherein the areal section (F) is completely covered by a removable cover sheet.

    11. The sack according to claim 10, wherein the sack, except for the areal section (F) and the removable cover sheet, comprise or consist of the same material.

    12. The sack according to claim 1, wherein the sack contains a liquid or pulverulent material.

    13. A method for withdrawing a liquid or pulverulent material from a sack according to claim 12, comprising the following steps in the order indicated a) optionally at least partly uncovering the areal section (F), if a cover sheet is present, b) introducing the sack into a water-containing vessel such that the areal section (F) is situated at least partly below the water line, c) waiting until the areal section (F) has at least partially dissolved, d) pulling the sack out of the vessel, with the opening resulting from the at least partial dissolution of the areal section (F) being situated at least partly below the water line during the pull-out.

    14. A method for producing a sack according to claim 1, wherein an area of a water-insoluble paper or a water-insoluble polymer is attached to an area of a water-soluble polymer.

    15. A method comprising packing of liquid or pulverulent materials in the sack according to claim 1.

    16. (canceled)

    17. The method according to claim 15, for the reduction of the release of unpleasant odors and/or harmful substances into the air

    18. The method according to claim 15, for the reduction of the release of alveoli-reaching dusts.

    Description

    [0071] FIG. 1 shows an example of a modified valve bottom sheet (1) as part of a sack according to the present invention, in which the areal section (F) (2) in the bottom of the sack is situated and consists of a polyvinyl alcohol film. The modified valve bottom sheet (1) as part of the sack itself can, for example, consist of paper, especially kraft paper, or polyethylene, especially LDPE. The sack itself can, for example, consist of paper or LDPE.