WO1997014551A1 - Machine servant a fabriquer des comprimes - Google Patents

Machine servant a fabriquer des comprimes Download PDF

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Publication number
WO1997014551A1
WO1997014551A1 PCT/IB1996/001057 IB9601057W WO9714551A1 WO 1997014551 A1 WO1997014551 A1 WO 1997014551A1 IB 9601057 W IB9601057 W IB 9601057W WO 9714551 A1 WO9714551 A1 WO 9714551A1
Authority
WO
WIPO (PCT)
Prior art keywords
punches
ring
turret
chamber
die hole
Prior art date
Application number
PCT/IB1996/001057
Other languages
English (en)
Inventor
Roveno Bonora
Original Assignee
I.M.A. Industria Macchine Automatiche S.P.A.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by I.M.A. Industria Macchine Automatiche S.P.A. filed Critical I.M.A. Industria Macchine Automatiche S.P.A.
Publication of WO1997014551A1 publication Critical patent/WO1997014551A1/fr

Links

Classifications

    • 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

Definitions

  • the present invention relates to production of aggregates by compression of powder or granular material.
  • the present invention relates to a rotary tabletting machine, which is equipped with pairs of counterfacing punches .
  • tablets are produced from powder material by rotary compression machine, which usually includes a rotating turret, means for batching and positioning the material to be compressed, compression means, and means for ejection of the produced tablets .
  • rotary compression machine which usually includes a rotating turret, means for batching and positioning the material to be compressed, compression means, and means for ejection of the produced tablets .
  • Examples of such compression machines are described in the US-A-2, 989,781, US-A-3, 677, 673, US- A-3, 999,922 and US-A-4, 108, 338.
  • This lastly mentioned machine includes a turret, that rotates in a predetermined direction, and fitted with a ring-like plate set around it in an vertical intermediate position.
  • This plate is has a plurality of regularly spaced apart die holes, defined by internal parts of through holes which have their axes parallel to the rotation axis of the turret.
  • the through holes are situated in the region of an outlet of feeding radial channels which originate from the bottom of a supply chamber.
  • the supply chamber is made inside the turret and contains the granular or powder material to be compressed.
  • each die hole of the ring-like plate there is provided a pair of counterfacing punches, which are slidably guided so that they can slide along a direction parallel to the turret axis.
  • Each punch features a working head.
  • the means for driving and guiding the punches of the machine of this publication include fixed groove cams, with a pair of rollers sliding therein and connected to the upper part of the punches.
  • the groove cams are shaped in such a way as to impart the punches vertical movements in mutual time relation with one another.
  • Each die hole of the ring-like plate is fed with the material to be compressed which is delivered from the supply chamber, via the respective radial channel, due to centrifugal force, that acts on the material as a result of the turret rotation.
  • the upper punch is driven upwards, while the lower punch remains motionless in order to further facilitate introduction of the material inside each die hole.
  • This upward movement creates a depression condition inside the die hole, thus facilitating filling thereof .
  • the compression procedure includes a sequence of working steps performed by suitable reciprocal movements of each pair of punches, so that very- compact and stable tablets are produced as rapidly as possible.
  • This publication is concerned with a method for the production of tablets, which method includes an initial step which the material is gradually compacted, a releasing step in which compressing thrust is removed, and afterwards, a precompression step, a precompression thrust maintenance step, a releasing step, a main compression step and an ejection step in which the tablet obtained is ejected.
  • All the above mentioned steps are performed by repeated reciprocal approaching and separation movements of the counterfacing working heads of the pairs of punches, inside the related die hole of the ring-like plate.
  • the object of the present invention is to improve the above mentioned tabletting machine so as to maintain the effect of tightness between the working heads and related die holes of the ring-like plate without substantial reduction of the clearance left between the punches and the walls of the holes.
  • Another object of the present invention is to propose an improvement that does not complicate construction, installation and maintenance of the subject machine.
  • a machine for compression of powder or granular material including: a rotary turret having vertical rotation axis; at least one ring-like plate, rigidly fastened to the said turret and provided with a plurality of die holes, formed by through holes having their axes parallel to the rotation axis of said turret; a pair of punches, lower and upper respectively, provided for each die hole of the ring ⁇ like plate, said punches being slidably guided to enter said die holes in a direction parallel to the turret rotation axis and in reciprocal time relation, in order to perform a working sequence for production of tablets, beginning from a predetermined amount of material to be compressed; working heads, lower and upper respectively, connected to each pair of said punches so that said working heads faces each other and define a compression chamber inside the die hole, with a clearance left between the working heads and the related die hole; at least one radial channel, provided for each die hole, for feeding continuously
  • the machine features sealing means, aimed at preventing inflow of air to said chamber from outside, thus creating a depression inside said chamber as a result of related movements of said punches.
  • FIG. 1 shows a schematic lateral section of a part of the tabletting machine improved in accordance with the present invention.
  • number 1 indicates a rotary turret that belongs to a rotating tabletting machine, for example of the type described in the above mentioned publications US-A-4.943.227, WO-A-9515846 and WO-A-9515847.
  • a ring-like plate 5 is fastened around the turret and has a plurality of die holes 2, regularly spaced apart and defined by through holes which have their axes parallel to the rotation axis of the turret 1.
  • the section of the die holes 2 corresponds to the section of the tablets to be produced.
  • sections can be round and perfectly circular, to obtain circular tablets, or they may be not circular, e.g. to obtain oblong tablets.
  • section of the die holes can be any, with a curved profile.
  • each die hole 2 there is provided a pair of punches 20,30, lower and upper respectively, arranged all around the turret 1 and guided slidably along an axis parallel to the rotation axis of the same turret 1.
  • the punches feature working heads 21 and 31, lower and upper respectively, that, in operation, fit into the die holes 2 from above and below.
  • the free ends 21a, 31a of the working heads 21,31 of each punch pair delimit, inside the die hole 2, a compression chamber 7, whose volume depends on the distance between the heads and whose position changes due to the related movements of the punches 20,30.
  • This compression chamber 7 is cyclically fed with a proper batch of material to be compressed.
  • Each chamber 7 is fed via a radial channel 4 which is made in the turret 1.
  • the channels depart from a supplay chamber, not shown in the figure, containing the material to be compressed and lead to the respective die holes 2.
  • Each compression chamber 7 can also change its position inside the die hole 2, during the tablet production step.
  • Sections of the die hole 2 and working head 21 are not perfectly identical, but they are made in such a way that there is left a clearance, as limited as possible, in relation to constructive tolerances.
  • the lower working head 21 has also a ring-like gasket 10, generally made of rubber or another similar material, located around the end 21b, where the working head is connected to the punch 20.
  • the gasket 10 striks against the lower surface 5a of the ring-like plate 5, to prevent air from flowing into the chamber 7 through the above mentioned clearance between the lower working head 21 and the hole 2.
  • the gasket guarantees the tightness at the bottom of the related chamber.
  • Production of tablets using the present compression machine can be carried out, for example, according to the previously mentioned method described in the publication WO-A-9515846, or according to the operation of the machine described in the above mentioned publication US-A-4.943.227.
  • tablets are produced by a predetermined sequence of reciprocal approaching and separation movements of the counterfacing working heads 21,31 of the pairs of punches 20,30, inside the die holes 2.
  • the working heads 21,31 are displaced so as to locate the chamber 7 in the region of the outlet of the radial channel 4 of the die hole 2.
  • the ring-like gasket 10 abuts on the lower surface 5a of the ring-like plate 5, all around the lower working head 21.
  • the lower punch 20 is maintained steady, while the upper punch 30, and therefore the related upper head 31, is moved slightly in the direction indicated by the arrow V in Fig. 1, so as to increase temporarily the dimension of the chamber 7.
  • the punches 20,30 perform the necessary steps for compression of the material and production of tablets, according to the compression method that has been adopted.
  • the ring-like gasket 10, connected with the lower working head 21 of the punch 20 allows to combine profitably the action of the centrifugal force with the force produced by the depression inside the chamber 7.
  • a further advantage of the present invention lies in the fact that bigger tolerance while working the heads and the ring-like plate are allowed without jeopardising the production quality and efficiency of the compression machine.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Medical Preparation Storing Or Oral Administration Devices (AREA)

Abstract

Machine servant à fabriquer des comprimés à partir d'un matériau en granulés ou en poudre et comprenant une tête revolver (1), une plaque annulaire (5) pourvue de trous de matrice (2), ainsi que des paires de poinçons (20, 30) pénétrant dans les trous de matrice afin de constituer des comprimés, quand les têtes inférieure et supérieure (21, 31) de ces poinçons (20, 30) s'approchent l'une de l'autre selon des séquences prédéterminées. Chaque poinçon inférieur (20) possède un joint annulaire (10) situé dans la région de la tête (21) et quand ce poinçon (20) monte, le joint vient en butée contre la plaque annulaire (5), de manière à rendre étanche la région de contact entre le poinçon inférieur (20) et le trou de matrice correspondant (2). Ce joint annulaire (10) permet de créer une dépression à l'intérieur d'une chambre de compression (7) formée dans le trou de matrice correspondant (2), de manière à faciliter l'introduction d'une partie du matériau devant y être comprimé.
PCT/IB1996/001057 1995-10-19 1996-10-08 Machine servant a fabriquer des comprimes WO1997014551A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITBO95A000499 1995-10-19
IT95BO000499A IT1279665B1 (it) 1995-10-19 1995-10-19 Perfezionamenti ad una macchina comprimitrice

Publications (1)

Publication Number Publication Date
WO1997014551A1 true WO1997014551A1 (fr) 1997-04-24

Family

ID=11340868

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1996/001057 WO1997014551A1 (fr) 1995-10-19 1996-10-08 Machine servant a fabriquer des comprimes

Country Status (2)

Country Link
IT (1) IT1279665B1 (fr)
WO (1) WO1997014551A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3430532A (en) * 1967-07-13 1969-03-04 Usm Corp Means for making pellets,particularly explosive pellets
US3599578A (en) * 1968-11-18 1971-08-17 Fumio Sato Apparatus for producing press-molded articles
US4362493A (en) * 1980-07-09 1982-12-07 Doepel Wallace A Apparatus for compressing tablets
US4943227A (en) * 1987-12-30 1990-07-24 I.M.A. Industria Macchine Automatiche S.P.A. Compressing machine for making tablets
WO1995015846A1 (fr) * 1993-12-10 1995-06-15 I.M.A. Industria Macchine Automatiche S.P.A. Machine rotative de fabrication de comprimes

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3430532A (en) * 1967-07-13 1969-03-04 Usm Corp Means for making pellets,particularly explosive pellets
US3599578A (en) * 1968-11-18 1971-08-17 Fumio Sato Apparatus for producing press-molded articles
US4362493A (en) * 1980-07-09 1982-12-07 Doepel Wallace A Apparatus for compressing tablets
US4943227A (en) * 1987-12-30 1990-07-24 I.M.A. Industria Macchine Automatiche S.P.A. Compressing machine for making tablets
WO1995015846A1 (fr) * 1993-12-10 1995-06-15 I.M.A. Industria Macchine Automatiche S.P.A. Machine rotative de fabrication de comprimes

Also Published As

Publication number Publication date
IT1279665B1 (it) 1997-12-16
ITBO950499A1 (it) 1997-04-19
ITBO950499A0 (it) 1995-10-19

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