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US 8,734,692 B2Granted
Method for compacting a powdery composition at constant volume
AssigneeEurotab
InventorsPaul Branlard, Jacques Brosse, Laurent Kirchhoff, Gilles Rubinstenn
Life of this patent
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Abstract
A method for compacting powdery compositions wherein the composition is compacted down to a reduced volume and the composition is then maintained at constant volume until the solid compact product is obtained.
Claims10
A method for preparing a solid compact product with a determined volume from a powdery composition, comprising the following steps:
- a) placing an initial volume of the powdery composition in a confined space,
- b) applying a volume constraint for compacting said powdery composition with a variable holding force, wherein
- b1) the volume constraint is first controlled such that the volume of the confined space is reduced down to a compaction volume, said compaction volume being a volume less than or equal to the determined volume, and
- b2) the volume constraint is then controlled such that the volume of the confined space is maintained at said compaction volume until the variable holding force resulting from the volume constraint decreases by at least 10%,
- c) releasing the volume constraint,
- d) obtaining the solid compact product with the determined volume.
3 more elements
A method for preparing a solid compact product with a determined volume from a powdery composition, comprising the following steps:
- i) measuring a holding force required for maintaining a powdery composition at a constant compaction volume, said compaction volume being a volume less than or equal to the determined volume, and determining a compression curve of said powdery composition representing the variations of the holding force during the maintaining of the constant compaction volume,
- a) placing an initial volume of the powdery composition in a confined space,
- b) applying a volume constraint for compacting said powdery composition with a variable holding force, wherein
- b1) the volume constraint is first controlled such that the volume of the confined space is reduced down to the compaction volume, and
- b2) the volume constraint is then controlled using the compression curve such that the volume of the confined space is maintained at said compaction volume until the variable holding force decreases by at least 10%,
- c) releasing the volume constraint,
- d) obtaining the solid compact product with the determined volume.
4 more elements
Dependencies are inferred from the claim text.