Method for producing a container from a container blank, in particular with a reduction in the height of the container blank
The invention relates to a method comprising, as method steps, a) providing a container blank comprising a blank wall at least partly surrounding a blank interior, comprising i) a multitude of particles, and ii) a liquid in a first proportion of liquid; and b) shaping the container blank thereby obtaining a container comprising a container wall which at least partly surrounds a container interior and comprises a container layer comprising i) the particles of the multitude of particles, and ii) the liquid in a further proportion of liquid; wherein the further proportion of liquid is less than the first proportion of liquid. The invention further relates to a container obtainable by the above method; to a container having a container layer; to a method of filling and closing one of the aforementioned containers; to a closed container obtainable by said method; to an apparatus; and to uses of a filling machine, of one of the aforementioned containers, of the apparatus and of a multitude of fibers.
1. A method comprising, as method steps,
a) providing a container blank which has a height and comprises a blank wall at least partly surrounding a blank interior, comprising
i) a multitude of particles, and
ii) a liquid in a first proportion of liquid; and
b) shaping the container blank thereby obtaining a container comprising a container wall which at least partly surrounds a container interior and comprises a container layer comprising
i) the particles of the multitude of particles, and
ii) the liquid in a further proportion of liquid;
wherein the further proportion of liquid is less than the first proportion of liquid,
wherein the shaping in method step b) comprises reducing the height of the container blank.
2. The method as claimed in claim 1 , wherein the container blank prior to method step b) is introduced into a negative mold of at least part of the container.
3. The method as claimed in claim 2 , wherein the negative mold comprises a mold wall that at least partly surrounds a mold interior,
wherein the mold wall at least in parts
I. is permeable to the liquid, and
II. is less permeable to the particles of the multitude of particles compared to the liquid.
4. The method as claimed in claim 1 , wherein the blank wall comprises a mouth region that forms a blank opening of the container blank,
wherein the shaping in method step b) comprises shaping the mouth region of the container blank thereby obtaining a mouth region of the container that forms a container opening of the container,
wherein the shaping of the mouth region of the container blank in method step b) comprises contacting the blank wall in the mouth region with a shaping tool,
wherein the contacting with the shaping tool comprises accommodating of the blank wall in the mouth region between an outer ring of the shaping tool and an inner ring of the shaping tool.
5. The method as claimed in claim 4 , wherein the inner ring in the shaping tool is arranged and designed so as to be elastically deformable with respect to the outer ring.
6. The method as claimed in claim 4 , wherein the blank wall in its mouth region comprises an edge surrounding the blank opening,
wherein the shaping tool in method step b) additionally surrounds the edge,
wherein the edge in method step b) is contacted with the inner ring.
7. The method as claimed in claim 4 , wherein the inner ring is arranged and designed so as to be elastically deformable with respect to the outer ring in the shaping tool.
8. The method as claimed in claim 1 , wherein the particles of the multitude of particles are fibers.
9. The method as claimed in claim 8 , wherein the fibers comprise a chemical pulp or a mechanical pulp or both.
10. The method as claimed in claim 1 , wherein the container wall has a container opening,
wherein the container interior
I) has a maximum diameter in a plane perpendicular to a height of the container interior, and
II) has a diameter less than the maximum diameter of the container interior at least in sections in the direction from the plane to the container opening.
11. The method as claimed in claim 1 , wherein the method further comprises at least partly superimposing the container layer with an inner polymer layer on a side of the container layer facing the container interior.
12. The method as claimed in claim 1 , wherein the method further comprises at least partly superimposing the container layer with an outer polymer layer on a side of the container layer remote from the container interior.
13. The method as claimed in claim 1 , wherein the height of the container blank is reduced in method step b) to a value within a range from 50% to 99.9% of the height of the container blank in method step a).
14. The method as claimed in claim 1 , wherein the reducing of the height of the container blank in method step b) comprises pressing the container blank in lengthwise direction with a pressure within a range from 200 to 10 000 kN/m 2 , based on a maximum cross-sectional area of the container blank in a plane perpendicular to the height of the container blank.