# US 5,517,871 A · Procedure for simulating tablet compression > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,517,871 A - Document ID: US5517871A - Status: Granted - Kind: A - Application number: 08/187,409 - Filed: 1994-01-27 - Granted: 1996-05-21 - Earliest claimed: 1993-01-28 - Assignees: Tensor Corporation - Inventors: Tapio Pento - Web page: https://patentgrep.com/patent/US5517871A ## CPC - B30B 11/005: {Control arrangements} - G05B 19/42: Recording and playback systems, i.e. in which the program is recorded from a cycle of operations, e.g. the cycle of operations being manually controlled, after which this record is played back on the same machine - G05B 2219/50073: Signature analysis, store forces during test, compare with real ones during assemby - B30B: PRESSES IN GENERAL (producing ultra-high pressure or ultra-high pressure and high temperature to effect modifications of a substance, e.g. for making artificial diamonds B01J3/00 ){(compressing means for refuse receptacles B65F1/1405)} - G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G) ## Abstract The invention concerns a procedure for simulating a desired tablet pressing situation, the tablet compound being placed in a pressing matrix in the device and the compound being compressed with the aid of punch members provided in the device on opposite sides of the matrix, in accordance with a preselected motion path, in the procedure being measured forces acting on at least one punch member of the tablet press during pressing and/or the motion path of the punch member; the results of measurment thus obtained being transferred to a computer controlling the operation of the trial tablet press, and a file being formed thereof; during such simulation the motion path of the punch members in the trial tablet press being controlled in accordance with the file formed of the results of measurement. ## Claims ### Claim 1 A procedure of a tablet compound being pressed into a tablet in a desired tablet press by using a trial tablet press which simulates the tablet compound being pressed into the tablet in the desired tablet press, so that the desired tablet press is controlled to conform to measured movements obtained from the trial tablet press, wherein in the desired tablet press, the tablet compound is placed in a pressing matrix of a desired tablet pressing device, the tablet compound is compressed by punch members, provided by a trial tablet pressing device, on opposite sides of the pressing matrix of the desired tablet pressing device, and wherein a motion path of each of the punch members is in accordance with a predetermined motion path, the procedure comprising the steps of: providing a displacement transducer for each of the punch members of the trial tablet pressing device, each displacement transducer being in conjunction with each of the punch members; installing the punch members on opposite sides of a pressing matrix of the trial tablet pressing device; placing the tablet compound in the pressing matrix of the trial tablet pressing device; pressing the tablet compound by the punch members; measuring a motion path of at least one of the punch members during pressing of the trial tablet press by at least one of the displacement transducers; transferring results of measurements obtained from at least one of the displacement transducers to a computer which controls an operation of the trial tablet press; forming a file in the computer; controlling the motion path of at least one of the punch members in the trial tablet press by the computer in accordance with the file formed; installing the punch members in the desired tablet pressing device on opposite sides of the pressing matrix of the desired tablet pressing device; placing the tablet compound in the pressing matrix of the desired tablet pressing device; pressing the tablet compound in the desired tablet press; measuring the motion path of at least one of said punch members during pressing of the desired tablet press by at least one of said displacement transducers; transferring results of measurements obtained from at least one of the displacement transducers to the computer which controls an operation of the desired tablet press; and controlling the motion path of at least one of the punch members in the desired tablet press by the computer by using the results of measurements obtained from the displacement transducers in the desired tablet press together with the results of measurements obtained from the trial tablet press. ### Claim 2 (depends on 1) Procedure according to claim 1, further comprising steps of: providing a force transducer for each of said punch members, each force transducer being disposed on each of said punch members; and measuring forces which act on at least one of said punch members in the trial tablet press; and transferring results of measurements of forces to the computer. ### Claim 3 (depends on 1) Procedure according to claim 1, wherein a speed of each of the punch members is less than 600 mm/s, a maximum acceleration of each of the punch members is at least 20 m/s.sup.2, and a maximum compression force of each of the punch members is 20-100 kN. ### Claim 4 (depends on 2) Procedure according to claim 2, wherein a speed of each of the punch members is less than 600 mm/s, a maximum acceleration of each of the punch members is at least 20 m/s.sup.2, and a maximum compression force of each of the punch members is 20-100 kN.