摘要:
In a tabletting press comprising a turret (2) rotatable with respect to a housing (1) and carrying rotatably with it a plurality of dies and a plurality of opposed pairs of punches (3; 3', 3") and a pair of rotatable pressure rolls (7; 7', 7") between which the opposed punches are passed to form tablets in successive dies, and respective curves (5 ; 5', 5") mounted, in use, non-rotatably with respect to the housing to control movement of the opposed pair of punches in less heavily loaded sectors of the tabletting cycle outside the influence of the compression rolls, an improved compression profile is achieved by interposing between at least one of the compression rolls and heads of associated punches under its influence a rotatable disc (11 ; 11', 11) one surface (15) of which is acted on by the associated compression roll and the other surface (17) of which contacts the heads of the punches to control the compression profile of the punches outside of the influence of the fixed curves. Conveniently the disc has an axis of rotation inclined with respect to the axis of the punches.
摘要:
In a tabletting press comprising a turret (2) rotatable with respect to a housing (1) and carrying rotatably with it a plurality of dies and a plurality of opposed pairs of punches (3; 3', 3") and a pair of rotatable pressure rolls (7; 7', 7") between which the opposed punches are passed to form tablets in successive dies, and respective curves (5 ; 5', 5") mounted, in use, non-rotatably with respect to the housing to control movement of the opposed pair of punches in less heavily loaded sectors of the tabletting cycle outside the influence of the compression rolls, an improved compression profile is achieved by interposing between at least one of the compression rolls and heads of associated punches under its influence a rotatable disc (11 ; 11', 11) one surface (15) of which is acted on by the associated compression roll and the other surface (17) of which contacts the heads of the punches to control the compression profile of the punches outside of the influence of the fixed curves. Conveniently the disc has an axis of rotation inclined with respect to the axis of the punches.
摘要:
A tabletting machine having a ring-shaped die table (25, 33, 27) rotatable about a generally upwardly extending axis (11) and having dies (40) arranged in bores in a die surface (38). Radially outer punches (16 - Fig. 7), supported in the die table (25) and reciprocably driven by a cam track (52 - Fig. 7) with respect to the dies (40), co-operate with radially inner punches (83) semi-rigidly mounted on a rotatable hub (23) to form and eject tablets from the dies. The hub (23) is rotated about an axis (10), parallel to the die table axis (11), and moves the radially inner punches (83) in a circular path to enter and exit the dies (40) in a predetermined sequence. A feed plate (102, 144, 146, 147), onto which tabletting material is supplied, directs the material onto distribution vanes (108) and thence into the dies (40). Individual pump means (50, 46 - Fig. 7) associated with the radially outer punches (16) and means (154, 155) for catching and extracting loose tabletting material failing from the dies serve to reduce contamination of the moving parts of the machine by the tabletting material.
摘要:
A tabletting machine having a ring-shaped die table (25, 33, 27) rotatable about a generally upwardly extending axis (11) and having dies (40) arranged in bores in a die surface (38). Radially outer punches (16 - Fig. 7), supported in the die table (25) and reciprocably driven by a cam track (52 - Fig. 7) with respect to the dies (40), co-operate with radially inner punches (83) semi-rigidly mounted on a rotatable hub (23) to form and eject tablets from the dies. The hub (23) is rotated about an axis (10), parallel to the die table axis (11), and moves the radially inner punches (83) in a circular path to enter and exit the dies (40) in a predetermined sequence. A feed plate (102, 144, 146, 147), onto which tabletting material is supplied, directs the material onto distribution vanes (108) and thence into the dies (40). Individual pump means (50, 46 - Fig. 7) associated with the radially outer punches (16) and means (154, 155) for catching and extracting loose tabletting material failing from the dies serve to reduce contamination of the moving parts of the machine by the tabletting material.
摘要:
A rotatable drum (10) has means (S) for spraying a coating material onto a localized area (Z) of the cascading tablet surface (C) of a tumbling bed (B) of tablets being rotated in the drum. Means (not shown) is also provided for supplyindrying air into the drum to dry the coated tablets. Open-ended tubular members (12) mounted inside the drum, pass through the tumbling bed of tablets and completely beneath the localized area (Z) as the drum is rotated. The members (12) thus extract tablets from the stagnant core (D) of the tablet bed and distribute the extracted tablets onto the cascading tablet surface (C) so as to hasten the coating process.
摘要:
A tabletting machine having a ring-shaped die table (25, 33, 27) rotatable about a generally upwardly extending axis (11) and having dies (40) arranged in bores in a die surface (38). Radially outer punches (16 - Fig. 7), supported in the die table (25) and reciprocably driven by a cam track (52 - Fig. 7) with respect to the dies (40), co-operate with radially inner punches (83) semirigidly mounted on a rotatable hub (23) to form and eject tablets from the dies. The hub (23) is rotated about an axis (10), parallel to the die table axis (11), and moves the radially inner punches (83) in a circular path to enter and exit the dies (40) in a predetermined sequence. A feed plate (102, 144, 146, 147), onto which tabletting material is supplied, directs the material onto distribution vanes (108) and thence into the dies (40). Individual pump means (50, 46 - Fig. 7) associated with the radially outer punches (16) and means (154, 155) for catching and extracting loose tabletting material falling from the dies serve to reduce contamination of the moving parts of the machine by the tabletting material.