DEVICE FOR FORMING TABLETS BY CONSTANT VOLUME COMPACTION

摘要

The invention relates to a press device for manufacturing tablets from a mixture of at least one component, comprising:
first means (7) for controlling a first punch, the first control means (7) comprising a compaction cam (9) for displacing the first punch (3) into a compaction position, said compaction cam (9) comprising a cam path on which said first punch (3) is capable of being displaced, the cam path comprising a planar portion (90) substantially perpendicular to the axis of the first punch (3), the planar portion (90) extending over an angular section comprised between 5° and 170° for maintaining the first punch (3) in a compaction die (2) at a fixed axial compaction position during a determined compaction maintaining time,second means (7) for controlling a second punch, the second control means (8) also comprising means for maintaining the second punch in said die at a fixed axial compaction position at least during said compaction maintaining time,so as to maintain, during said compaction-maintaining time, the confinement volume (V) at a constant volume corresponding to the compaction volume for forming the tablet.

主权项

1. A press device for manufacturing tablets from a powdery composition of at least one powder having elastic properties or thermofusible properties or tending to change state during compaction from a solid state to a pasty or liquid state, comprising:
a turntable (1) in which is arranged at least one die (2) for receiving the powdery composition, at least one compaction assembly comprising a first punch (3) and a second punch (4), said first and second punches being laid out on either side of the turntable (1) facing the die (2), and being mounted so as to be translationally mobile coaxially with the die (2), first control means (7) and second control means (8) for controlling axial displacement of the first punch (3) and of the second punch (4) respectively, said first (7) and second (8) control means comprising means co-operating for maintaining the first (3) and second (4) punches in a fixed axial position in which the first (3) and second (4) punches define a confinement volume (V) with the die (2),wherein the first control means (7) comprise a compaction cam (9) for displacing the first punch (3) into a compaction position,
said compaction cam (9) comprising a cam path on which said first punch (3) is capable of being displaced, the cam path comprising a planar portion (90) substantially perpendicular to the axis of the first punch (3), the planar portion (90) extending over an angular section comprised between 5° and 170° for maintaining the first punch (3) in the die (2) at a fixed compaction axial position during a determined compaction-maintaining time, the second control means (8) also comprising means for maintaining the second punch in said die at a fixed compaction axial position at least during said compaction-maintaining time, so as to maintain, during said compaction-maintaining time, the confinement volume (V) at a constant volume corresponding to the compaction volume for forming the tablet.