US3663147A - Rotary press-molding apparatus - Google Patents

Rotary press-molding apparatus Download PDF

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Publication number
US3663147A
US3663147A US42687A US3663147DA US3663147A US 3663147 A US3663147 A US 3663147A US 42687 A US42687 A US 42687A US 3663147D A US3663147D A US 3663147DA US 3663147 A US3663147 A US 3663147A
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US
United States
Prior art keywords
punch members
punch
punches
rollers
compression
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US42687A
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English (en)
Inventor
Hideyuki Maekawa
Teruo Sakamoto
Yoshihisa Sagawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shionogi and Co Ltd
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Shionogi and Co Ltd
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Filing date
Publication date
Application filed by Shionogi and Co Ltd filed Critical Shionogi and Co Ltd
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Publication of US3663147A publication Critical patent/US3663147A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B11/00—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses
    • B30B11/02—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space
    • B30B11/08—Presses specially adapted for forming shaped articles from material in particulate or plastic state, e.g. briquetting presses, tabletting presses using a ram exerting pressure on the material in a moulding space co-operating with moulds carried by a turntable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/02—Dies; Inserts therefor; Mounting thereof; Moulds
    • B30B15/026—Mounting of dies, platens or press rams

Definitions

  • the present invention generally relates to production of molded articles such as medicinal tablets and has for its object the provision of an improved apparatus for the production of such articles.
  • the invention concerns a novel apparatus capable of effecting improved tableting performance on such materials as have hitherto proved difficult to mold and uses fewer compressing operations with a higher speed of formation of the tablets.
  • tablette to include any compressed moldings of foods, pharmaceuticals, agricultural chemicals, powdered metals, ceramics, plastics and the like, including those which are mechanically compressed to form sufficiently firm bonding: prior to sintering thereof or coating thereover, and the term tableting" to include any process for producing the aforedefined moldings.
  • FIGS. 1 through 5 are graphic diagrams elucidating the experimental results on which the present invention is based.
  • FIG. 6 is a vertical rectilinear fragmentary sectional view of the structure composed of essential components of the invention, including a rotational structure, which is extended and projected as an embodiment of the present invention, and
  • FIG. 7 is a partially sectional elevation of the embodiment shown in FIG. 6.
  • the hardness can be expressed as breaking strength represented by the load in kilograms exerted to break the tablet, it being regarded that the larger the value thereof the stronger the durability of the tablet against breaking, while the recovery from distortion" can be expressed as the magnitude of the expansion of the tablet after it has once been compressed to 4 mm thickness, it being regarded that the smaller the value thereof the less the occurence of capping or lamination.
  • the patterns of the compression shown in FIG. 3 are schematic graphs wherein the ordinates (non-linear graduation) represent the magnitude of pressure exerted during the compressing operation and the abscissa represent time.
  • Each acute peak appearing in the figures corresponds to a major compression by means of the main compression rollers (Ca. 2,000 Kg per one tablet having a diameter of 5-15 mm) and each of the plateaux appearing in graphs B, D, E and F corresponds to the auxiliary compression (Ca. 300 Kg).
  • the auxiliary compression exhibits advantageous results on the compressing operation and the characteristics of the finished products.
  • FIGS. 4 and 5 illustrate the influence of the auxiliary compression (P,) on the hardness and the recovery from distortion, respectively, in terms of the varying pressure, assuming that the compression pattern is like that of B of FIG. 3.
  • the auxiliary compression is effective over a very wide pressure range from 300 to 1,200 Kg, per tablet and the possibility of exhibiting a great effect is expected even with a very low pressure compared to that of the major compression by the compressing rollers.
  • the present invention is based on the results of the previously described investigation while utilizing the construction of the known conventional rotary tableting machine of the punch-and-die type.
  • a punch-and-die type rotary press-molding apparatus generally including in combination: a stationary frame, a laminated rotational structure composed of upper and lower punch blocks and an interposed die block each having a multiplicity of upper punches, lower punches and die cavities, respectively, around the circumference thereof, rotatably mounted around a vertical axis on said stationary frame, at least one pair of spaced opposed upper and lower compressing rollers, one above and one below the rotational structure, mounted rotatably around axes which intersect said vertical axis on said stationary frame holding said rotational structure and capable of exerting pressures on said punches.
  • the apparatus includes an improvement which comprises; an auxiliary roller on each of the punches or the sheathes thereof and tracking rails on the stationary frame of the apparatus which rails are capable of exerting a pressure on said punches through said auxiliary rollers upon rotation of the rotational structure i.e., upon the sequential transferring of the punches around the axis of the rotational structure.
  • FIG. 6 is a vertical rectilinear fragmentary sectional view of the structure composed of essential members of the machine including the rotational structure (punch and die blocks) extended and projected onto a plane which is tangential to the cylindrical surface containing the circular track along which said punches and die cavities are transferred, compressing rollers, guide rails and overriders, delineated with the assumption that the right extreme of the drawing is connected to the left extreme thereof and that the punches, die cavities, and the members carrying these components are continuously transferred from the left to the right by rotation of the rotational structure.
  • the rotational structure punch and die blocks
  • successive conditions in the tableting cycle of a pair of punches, relative to the die cavity in which they are operative, are shown by the successive representations from left to right on the diagram, designated by successive position numerals (the last two figures of three figures numbers e.g., 02 of 202,302 or 402).
  • an assembly of rotational structures (including turntable or punch blocks and die blocks) 5153 is pivoted around the vertical axis of the stationary frame 1 of the apparatus, which assembly holds multiplicities of the upper and lower punches or the sheathes therefor.
  • the punches are shown as being integrally formed with the sheathes but these are generally separable.
  • the punches and sheathes are hereinafter called punch numbers.
  • the upper punch members are represented by numerals 201 through 217 and the lower punch members by numerals 301 through 317, and the die cavities by 401 through 417.
  • the interior of each die cavity is able to conform to the heads of said upper and lower punch members.
  • Rotational movement caused by an unshown driving mechanism causes a circular movement of each pair of said punch members and dies around the circumference in a horizontal plane.
  • the rotational structure is shown in FIG. 6, as having a laminated construction composed essentially of three stories, namely the upper story or upper punch block 51, holding the upper punch members 201 through 217 while permitting their vertical movement, the middle story or die block 52 fixedly holding the die cavities 401 through 417 and the lower story or lower punch block 53 holding the lower punch members 301 through 317 equally permitting their vertical sliding movement, the structure is practically an integral member, or at least functions as one member, because its purpose is to enable the transferring of each combination of punch members and die in parallel while keeping them in a single vertical line.
  • the illustrated apparatus has two major sequentially operable compressing stages.
  • the punch members 201 through 217 and 301 through 317 are required to have the capability of vertical movement to perform operations preparatory or complementary to the major compression, in other words, movements for charging materials to be molded into the die cavities and for ejecting the finished tablets as well as the other attendant movements.
  • tracking rail 7 and overriders 81 and 82 cooperating with said punch members, are installed on the stationary frame 1 of the apparatus in accordance with their required function.
  • a feeder 9 for charging material 8 to be molded into the die cavity and a deflecting baffle 11 capable of deflecting the tablet molded and thrust up over the surface of the die block 52, are provided and pertinent positional relationships are maintained between them.
  • extentions 82' and B2" of the overrider 82 which can be installed in conventional machines in order to prevent the lower punch members from falling, will be made dispensable by the adoption of the present invention.
  • the die cavity supplied with the material 8 to be molded by the feeder 9 at the position 401 at the left extreme of P10. 7 combines with the upper and lower punch members to compress the material at the positions 203 through 205, 303 through 305 and 403 through 405 while being transferred to the right in the drawing to the positions 207, 307 and 407 where the material is subjected to a compression by the rollers 61 and 62.
  • the combination of the punch members and die further travels to the right while holding the material once compressed therein and is subjected again to a compression by the rollers 63 and 64 at their positions 211, 311 and 411 and further continues to travel while the lower punch members is thrust up together with the molded tablet 10 and the upper punch members by the overriders 81 and 82 which contact the root portions of the lower punch members at the positions 312 through 315.
  • the upper punch member also begins to be thrust up by the tracking rail 7 at the positions from 214 et. seq. and finally comes to a position where it leaves an adequate clearance above the molded article 10 which is pushed up over the surface of the middle story or die block 52 of the rotational structure at the positions 215 et.seq.
  • the molded article 10 is swept away from the track by the deflecting baftle 11 and is transferred to an unshown receptacle or subsequent processes.
  • upper and lower punch members each provided with a roller whose diameter is neariy equal to that of the punch member therefor as is indicated by numerals 2010 through 2174 and 3010 through 3170, are employed in addition to the above described conventional members and construction.
  • a plurality of semi-annular tracking rails 121, 122, 123 and 124, cooperative with said auxiliary rollers, are installed on the stationary frame 1 of the apparatus.
  • the tracking rail 121 contacts the upper punch members in the positions 204 through 210 at their rollers 2040 through 2100 while the tracking rail 123 contacts the lower punch members in the positions 304 through 31 1 at their rollers 3040 through 311a.
  • the tracking rail 122 contacts the upper punch members in the positions 212 through 214 at their rollers 212a through 214a while the tracking rail 124 contacts the lower punch members in the positions 312 through 314 at their rollers 312a through 3140.
  • each of the junctions between the auxiliary rollers and punch members is made so that it can withstand a pressure load of at least 300 Kg.
  • each of the tracking rails is installed on abutments 121a through 1240 projecting from the stationary frame of the apparatus through suitable resilient means such as springs 121s through 124s so that they can always keep good contact with the rollers.
  • the apparatus of the illustrated embodiment operates as follows; the combination of the die cavity and upper and lower punch members receives, while holding the material to be molded therein, auxiliary compressions due to the contact between the tracking rails and the auxiliary rollers at the positions before the first major compression, between both the major compression and after the second major compression, and these operation can be regarded as preparatory fastening, and complementaly or confirmatory compactings.
  • material to be molded receives a compression which corresponds to the compression pattern F of FIG. 3 during the travel.
  • the present invention is also applicable to ones having a single compression stage or ones having three or more compression stages, or machines having two or more tableting lines, operative in sequence in a single rotational structure which is conventionally called a double type machine."
  • shape or construction of the major compression rollers is not limited to the simple cylindrical column as shown in the drawings, but rollers of any other shape such as a frusto-conical shape capable of prolonging the dwelling period of the punches at their compacting extreme, can also be employed without major modification.
  • a punch-and-die type rotary compression molding apparatus which comprises; a stationary frame, a structure rotatably mounted around a vertical axis on said stationary frame and composed of upper and lower punch blocks and an interposed die block, each having a multiplicity of upper punch members, lower punch members and die cavities, respectively, around the circumference thereof, at least one pair of upper and lower compressing rollers, disposed one above and one below the rotatable structure, and mounted rotatably around axes which intersect said vertical axis, and capable of exerting pressures on said punch members, an auxiliary roller on each of the punch members, a plurality of divided semi-annular tracking rails installed, a plurality of abutments projecting outwardly from the stationary frame, and resilient means on said abutments and on which said tracking rails are mounted, said auxiliary rollers engaging said tracking rails for exerting a pressure on said punch members through said auxiliary rollers upon sequential movement of the punch members around the axis of the rotatable structure.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medicinal Preparation (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)
  • Powder Metallurgy (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
US42687A 1969-06-12 1970-06-02 Rotary press-molding apparatus Expired - Lifetime US3663147A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44046583A JPS503027B1 (enrdf_load_stackoverflow) 1969-06-12 1969-06-12

Publications (1)

Publication Number Publication Date
US3663147A true US3663147A (en) 1972-05-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US42687A Expired - Lifetime US3663147A (en) 1969-06-12 1970-06-02 Rotary press-molding apparatus

Country Status (7)

Country Link
US (1) US3663147A (enrdf_load_stackoverflow)
JP (1) JPS503027B1 (enrdf_load_stackoverflow)
CA (1) CA929799A (enrdf_load_stackoverflow)
CH (1) CH509149A (enrdf_load_stackoverflow)
DE (1) DE2029094C3 (enrdf_load_stackoverflow)
FR (1) FR2051098A5 (enrdf_load_stackoverflow)
GB (1) GB1251179A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057381A (en) * 1976-02-04 1977-11-08 Emil Korsch, Spezialfabrik Fur Komprimiermaschinen Rotary press
US5460827A (en) * 1991-04-12 1995-10-24 Elizabeth-Hata International, Inc. Elongated cylindrical medicinal tablet having two layers
US5698238A (en) * 1993-12-10 1997-12-16 I.M.A. Industria Macchine Automatiche S.P.A. Rotary tabletting machine
US20020068107A1 (en) * 2000-12-04 2002-06-06 Makoto Kitamura Powder press forming apparatus and method of powder press forming
US20020090412A1 (en) * 2000-12-04 2002-07-11 Makoto Kitamura Powder supplying apparatus and powder molding apparatus
US20040180079A1 (en) * 2003-03-12 2004-09-16 Colgate-Palmolive Company Method and composition
US20050208164A1 (en) * 2002-04-24 2005-09-22 Mitsubishi Denki Kabushiki Kaisha Permanent magnet forming device

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520203A1 (de) * 1985-06-05 1986-12-11 Wilhelm Fette Gmbh, 2053 Schwarzenbek Rundlaeufer-tablettiermaschine und verfahren zur steuerung ihrer druckrollen
DE3723651A1 (de) * 1987-07-17 1987-12-23 Blauer Miklos Zoltan Dipl Masc Universeller tablettenautomat fuer die tablettierung von pressepulver
FR2629712A1 (fr) * 1988-04-08 1989-10-13 Bordeaux Ii Inst Pharmacie Ind Dispositif permettant d'ameliorer les caracteristiques mecaniques des comprimes obtenus sur des machines a cadence elevee
IT1264287B1 (it) * 1993-12-10 1996-09-23 Ima Spa Metodo per la compressione di materiale polverizzato o granulare.
DE102005021923C5 (de) 2005-05-12 2014-03-13 Fette Compacting Gmbh Verfahren zum Betrieb einer Rundläuferpresse und Rundläuferpresse
IT201900019649A1 (it) * 2019-10-23 2021-04-23 Ima Spa Macchina comprimitrice e metodo di compressione.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944493A (en) * 1956-11-23 1960-07-12 Stokes F J Corp Multi-layer tablet manufacture
US2973555A (en) * 1955-09-09 1961-03-07 Agustin Mesa Rotary press for fabrication of buttons and plastic articles

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE305018C (enrdf_load_stackoverflow) *
US1155798A (en) * 1913-07-23 1915-10-05 Gorton Pew Fisheries Company Compressor.
DE807538C (de) * 1948-10-02 1951-07-02 Schaudt Maschb G M B H Druckrollenlagerung bei Rundlauf-Tablettierpressen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2973555A (en) * 1955-09-09 1961-03-07 Agustin Mesa Rotary press for fabrication of buttons and plastic articles
US2944493A (en) * 1956-11-23 1960-07-12 Stokes F J Corp Multi-layer tablet manufacture

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057381A (en) * 1976-02-04 1977-11-08 Emil Korsch, Spezialfabrik Fur Komprimiermaschinen Rotary press
US5460827A (en) * 1991-04-12 1995-10-24 Elizabeth-Hata International, Inc. Elongated cylindrical medicinal tablet having two layers
US5698238A (en) * 1993-12-10 1997-12-16 I.M.A. Industria Macchine Automatiche S.P.A. Rotary tabletting machine
US20020068107A1 (en) * 2000-12-04 2002-06-06 Makoto Kitamura Powder press forming apparatus and method of powder press forming
US20020090412A1 (en) * 2000-12-04 2002-07-11 Makoto Kitamura Powder supplying apparatus and powder molding apparatus
US7018194B2 (en) * 2000-12-04 2006-03-28 Murata Manufacturing Co., Ltd. Powder supplying apparatus and powder molding apparatus
US7056111B2 (en) * 2000-12-04 2006-06-06 Murata Manufacturing Co., Ltd. Powder press forming apparatus and method of powder press forming
US20050208164A1 (en) * 2002-04-24 2005-09-22 Mitsubishi Denki Kabushiki Kaisha Permanent magnet forming device
US7347681B2 (en) * 2002-04-24 2008-03-25 Mitsubishi Denki Kabushiki Kaisha Permanent magnet molding apparatus
US20040180079A1 (en) * 2003-03-12 2004-09-16 Colgate-Palmolive Company Method and composition

Also Published As

Publication number Publication date
DE2029094B2 (de) 1979-08-09
DE2029094C3 (de) 1984-07-19
DE2029094A1 (de) 1970-12-23
GB1251179A (enrdf_load_stackoverflow) 1971-10-27
FR2051098A5 (enrdf_load_stackoverflow) 1971-04-02
JPS503027B1 (enrdf_load_stackoverflow) 1975-01-30
CA929799A (en) 1973-07-10
CH509149A (de) 1971-06-30

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