WO1999025545A1 - Method of cleaning a surface of a cam of a tablet press - Google Patents

Method of cleaning a surface of a cam of a tablet press Download PDF

Info

Publication number
WO1999025545A1
WO1999025545A1 PCT/GB1998/003466 GB9803466W WO9925545A1 WO 1999025545 A1 WO1999025545 A1 WO 1999025545A1 GB 9803466 W GB9803466 W GB 9803466W WO 9925545 A1 WO9925545 A1 WO 9925545A1
Authority
WO
WIPO (PCT)
Prior art keywords
tool
punch
cleaning
cam
head
Prior art date
Application number
PCT/GB1998/003466
Other languages
French (fr)
Inventor
Howard Albert King
Original Assignee
Pharmacare Limited
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 Pharmacare Limited filed Critical Pharmacare Limited
Priority to AU11676/99A priority Critical patent/AU1167699A/en
Publication of WO1999025545A1 publication Critical patent/WO1999025545A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
    • B30B15/0082—Dust eliminating means; Mould or press ram cleaning means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/12—Brushes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/14—Wipes; Absorbent members, e.g. swabs or sponges
    • B08B1/145—Swabs
    • 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

  • This invention relates to a method of cleaning a surface of a cam of a tablet press, and to a cleaning tool for use in the method.
  • tablets such as for example pharmaceutical tablets and food products such as sweets
  • a loose material such as a powder
  • a plurality of upper and lower punches are carried by upper and lower punch guide hole plates, in a circular arrangement, and are operated upon by cams which, in turn, lift and lower the punches.
  • cams which, in turn, lift and lower the punches.
  • a method of cleaning a surface of a cam of a tablet press in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto, which method includes the steps of:
  • step (iii) the tablet press is preferably rotated through one full revolution. Thereafter, the cleaning tool may be removed and cleaned and steps (ii) and (iii) then repeated one or more times, if necessary.
  • a cleamng tool for cleaning a surface of a cam of a tablet press in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto, which cleaning tool comprises a tool shaft similar to the punch shaft of the punch and a tool head attached to the tool shaft, the tool head being adapted to clean a surface of the cam.
  • the tool head may comprise a holder and a cleaning element located in the holder.
  • the holder may comprise a head section having a slot therein and the cleaning element may comprise a felt insert or a brush insert adapted to be received and held in the slot.
  • the head section is preferably smaller than the equivalent punch head and the cleaning element is preferably of approximately the same size as or larger than the equivalent punch head, to ensure good cleaning of the surface of the cam.
  • the tool head may, in its entirety, be designed as a cleaning element.
  • the tool head may be made of a cleamng material such as felt or of a plastics material and carrying a plurality of bristles.
  • the tool head is preferably of approximately the same size as or larger than the equivalent punch head to ensure good cleaning.
  • the tool shaft may also be made of felt or of a plastics material respectively.
  • the cleamng tool of the invention may be used to clean any type of cam, whether an upper cam or a lower cam, and including a lifting cam, a carry over cam, a lowering cam, an ejection cam, a fill cam, and a weight adjustment cam.
  • Figure 1 is a front view of a section of a tablet press
  • Figure 2 is an exploded view of an upper cam of the tablet press of
  • Figure 1; Figure 3 is an exploded view of a lower cam of the tablet press of
  • Figures 4 to 6 are a side view, front view and top view of a cleaning tool for cleaning the cams of Figures 2 and 3.
  • the crux of the invention is a method of cleaning a surface of a cam of a tablet press, in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto.
  • the punch head is held by and/or operated on by the cam.
  • the punches are removed from the tablet press.
  • the punches will be carried by a tablet press turret including a plate having upper punch guide holes and a plate having lower punch guide holes and located therebetween, a plate including a plurality of cavities or dies.
  • At least one of the punches is replaced with a cleaning tool having a tool shaft and a tool head attached to the tool shaft.
  • the tool shaft is similar to the punch shaft of the punch so that the cleaning tool can be carried by the tablet press turret in the same manner as a punch.
  • the end of the punch shaft remote from the punch head is generally shaped for compression of the material to be tab letted in a die. This is not necessary for the tool shaft as the cleaning tool is not designed to clean or even enter the die.
  • the tool head is adapted to clean a surface of the cam over which it passes.
  • the turret press is rotated, preferably through at least one full revolution to allow the cleaning tool to clean the surface of the cam.
  • the cleaning tool may be removed and cleaned and the cleaning steps repeated, if necessary.
  • a tablet press 10 including an upper cam 12, a lower cam 14, an upper punch 16, a lower punch 18 and between them a die 20.
  • Each of the upper punch 16 and lower punch 18 include a punch shaft 22 and a punch head 24.
  • the lower punch 18 is lifted until an end 26 of the lower punch is located in the die 20, whereafter the die 20 is filled with a powder or granular material.
  • the upper punch 16 is lowered to compact the powdered granular material in the die 20 between the end 26 of the lower punch 18 and an end 28 of the upper punch 16, to form a tablet.
  • the formed tablet is ejected from the die 20.
  • the upper cam 12 is shown in more detail.
  • the upper cam 12 includes a lifting cam 30 designed to lift the upper punches 16 out of the dies 20, a carry over cam 32, and a lowering cam 34 designed to lower the upper punches 16 into the dies 20.
  • the lower cam 14 is shown in more detail.
  • the lower cam 14 includes an ejection cam 36 at which stage the formed tablets are ejected from the dies 20, a fill cam 38 at which stage the dies 20 are filled with the powder or granular material, and a weight adjustment cam 40 at which stage it is ensured that there is the right quantity of powder or granular material in the dies 20.
  • a cleaning tool 42 for the cams 12, 14, which consists of a tool shaft 44 similar in size and shape to the punch shaft 22 of the upper punch 16 or the lower punch 18, (except for the ends 26, 28), and a tool head 46.
  • the tool head 46 includes a head section 48 having a slot 50 therein, and a solid felt insert 52 located and held in the slot 50.
  • the cleaning tool 42 replaces either one of the upper punches 16 or one of the lower punches 18. Thereafter the tablet press 10 is rotated to allow the cleaning tool 42 to pass through the various sections of the upper cam 12 or the lower cam 14 and thus to clean the surfaces, particularly the inaccessible surfaces of the various sections of either the upper cam 12 or the lower cam 14.
  • the cleaning tool 42 is useful for cleaning the area 54 of the cam 30.
  • the head section 48 is approximately 2mm smaller than the punch head 24 of either the upper punch 16 or the lower punch 18, which ensures good clearance as the cleaning tool 42 passes through the cams 12, 14 in the tablet press 10.
  • the head section 48 includes a 5mm wide slot 50, which accommodates a felt insert 52 which is 2mm larger than the size of the punch head 24 of either the upper punch 16 or the lower punch 18.
  • the felt insert 52 wipes all the cam surfaces, removing old grease and remaining product.
  • the cleaning tool of the invention offers the opportunity to clean inaccessible areas of the cams 12, 14 while still in situ, reducing clean down times while maintaining a high standard of GMP (Good Manufacturing Practices).
  • GMP Good Manufacturing Practices
  • the cleaning tool of the invention may be used in place of various types of punches including keyed top punches, top punches and bottom punches which are not keyed, and B configuration and D configuration punches.
  • the cleamng tool 42 is illustrated with a felt insert 52, it is also possible to manufacture the cleaning tool 42 with a solid felt head, and shaft or from a plastics material with the head incorporating a plurality of bristles.

Landscapes

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

Abstract

A method of cleaning a surface of a cam (12, 14) of a tablet press (10), in which tablet press (10) the cam (12, 14) is adapted to operate on a plurality of punches (16, 18) which press the tablets, is disclosed. Each punch (16, 18) has a punch shaft (22) and a punch head (24) attached thereto. The method includes the steps of removing the punches (16, 18) from the tablet press (10); replacing at least one of the punches (16, 18) with a cleaning tool which has a tool shaft similar to the punch shaft (22) of the punch (16, 18) and a tool head attached to the tool shaft, the tool head being adapted to clean the surface of the cam (12, 14); and rotating the tablet press (10) to allow the cleaning tool to clean the surface of the cam (12, 14). In this way, inaccessible areas of the cams (12, 14) may be cleaned while still in situ.

Description

METHOD OF CLEANING A SURFACE OF A CAM OF A TABLET PRESS
BACKGROUND OF THE INVENTION
This invention relates to a method of cleaning a surface of a cam of a tablet press, and to a cleaning tool for use in the method.
It is well known to manufacture tablets, such as for example pharmaceutical tablets and food products such as sweets, from a loose material such as a powder, by compression or compaction of the powder between two opposing punches or plungers in a die or cavity. In a common form of tablet press, a plurality of upper and lower punches are carried by upper and lower punch guide hole plates, in a circular arrangement, and are operated upon by cams which, in turn, lift and lower the punches. One problem with this type of tablet press is that it is often difficult to clean the cams.
SUMMARY OF THE INVENTION
According to a first aspect of the invention there is provided a method of cleaning a surface of a cam of a tablet press, in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto, which method includes the steps of:
(i) removing the punches from the tablet press;
(ii) replacing at least one of the punches with a cleaning tool having a tool shaft similar to the punch shaft of the punch and a tool head attached to the tool shaft, the tool head being adapted to clean the surface of the cam; and (iii) rotating the tablet press to allow the cleaning tool to clean the surface of the cam.
In step (iii), the tablet press is preferably rotated through one full revolution. Thereafter, the cleaning tool may be removed and cleaned and steps (ii) and (iii) then repeated one or more times, if necessary.
According to a second aspect of the invention there is provided a cleamng tool for cleaning a surface of a cam of a tablet press in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto, which cleaning tool comprises a tool shaft similar to the punch shaft of the punch and a tool head attached to the tool shaft, the tool head being adapted to clean a surface of the cam.
The tool head may comprise a holder and a cleaning element located in the holder. For example, the holder may comprise a head section having a slot therein and the cleaning element may comprise a felt insert or a brush insert adapted to be received and held in the slot. In this case, the head section is preferably smaller than the equivalent punch head and the cleaning element is preferably of approximately the same size as or larger than the equivalent punch head, to ensure good cleaning of the surface of the cam.
Alternatively, the tool head may, in its entirety, be designed as a cleaning element. For example, the tool head may be made of a cleamng material such as felt or of a plastics material and carrying a plurality of bristles. In this case, the tool head is preferably of approximately the same size as or larger than the equivalent punch head to ensure good cleaning. The tool shaft may also be made of felt or of a plastics material respectively.
The cleamng tool of the invention may be used to clean any type of cam, whether an upper cam or a lower cam, and including a lifting cam, a carry over cam, a lowering cam, an ejection cam, a fill cam, and a weight adjustment cam.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a front view of a section of a tablet press;
Figure 2 is an exploded view of an upper cam of the tablet press of
Figure 1; Figure 3 is an exploded view of a lower cam of the tablet press of
Figure 1 ; and
Figures 4 to 6 are a side view, front view and top view of a cleaning tool for cleaning the cams of Figures 2 and 3.
DESCRIPTION OF EMBODIMENTS
The crux of the invention is a method of cleaning a surface of a cam of a tablet press, in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto. The punch head is held by and/or operated on by the cam.
In terms of the method, firstly the punches are removed from the tablet press. Generally, the punches will be carried by a tablet press turret including a plate having upper punch guide holes and a plate having lower punch guide holes and located therebetween, a plate including a plurality of cavities or dies.
Thereafter, at least one of the punches is replaced with a cleaning tool having a tool shaft and a tool head attached to the tool shaft.
The tool shaft is similar to the punch shaft of the punch so that the cleaning tool can be carried by the tablet press turret in the same manner as a punch. However the end of the punch shaft remote from the punch head is generally shaped for compression of the material to be tab letted in a die. This is not necessary for the tool shaft as the cleaning tool is not designed to clean or even enter the die.
The tool head is adapted to clean a surface of the cam over which it passes.
Thereafter the turret press is rotated, preferably through at least one full revolution to allow the cleaning tool to clean the surface of the cam.
Thereafter, the cleaning tool may be removed and cleaned and the cleaning steps repeated, if necessary.
Referring to Figure 1 , there is shown a tablet press 10 including an upper cam 12, a lower cam 14, an upper punch 16, a lower punch 18 and between them a die 20. Each of the upper punch 16 and lower punch 18 include a punch shaft 22 and a punch head 24. In use, the lower punch 18 is lifted until an end 26 of the lower punch is located in the die 20, whereafter the die 20 is filled with a powder or granular material. Thereafter, the upper punch 16 is lowered to compact the powdered granular material in the die 20 between the end 26 of the lower punch 18 and an end 28 of the upper punch 16, to form a tablet.
In a further stage, the formed tablet is ejected from the die 20.
Referring to Figure 2, the upper cam 12 is shown in more detail. The upper cam 12 includes a lifting cam 30 designed to lift the upper punches 16 out of the dies 20, a carry over cam 32, and a lowering cam 34 designed to lower the upper punches 16 into the dies 20. Referring to Figure 3 the lower cam 14 is shown in more detail. The lower cam 14 includes an ejection cam 36 at which stage the formed tablets are ejected from the dies 20, a fill cam 38 at which stage the dies 20 are filled with the powder or granular material, and a weight adjustment cam 40 at which stage it is ensured that there is the right quantity of powder or granular material in the dies 20.
Referring to Figures 4 to 6 there is shown a cleaning tool 42 for the cams 12, 14, which consists of a tool shaft 44 similar in size and shape to the punch shaft 22 of the upper punch 16 or the lower punch 18, (except for the ends 26, 28), and a tool head 46. In the cleaning tool 42 as illustrated, the tool head 46 includes a head section 48 having a slot 50 therein, and a solid felt insert 52 located and held in the slot 50.
In use, as described above, the cleaning tool 42 replaces either one of the upper punches 16 or one of the lower punches 18. Thereafter the tablet press 10 is rotated to allow the cleaning tool 42 to pass through the various sections of the upper cam 12 or the lower cam 14 and thus to clean the surfaces, particularly the inaccessible surfaces of the various sections of either the upper cam 12 or the lower cam 14. For example, referring to the lifting cam 30 in Figure 2, it can be seen that the cleaning tool 42 is useful for cleaning the area 54 of the cam 30.
In the cleaning tool 42 as illustrated, the head section 48 is approximately 2mm smaller than the punch head 24 of either the upper punch 16 or the lower punch 18, which ensures good clearance as the cleaning tool 42 passes through the cams 12, 14 in the tablet press 10. The head section 48 includes a 5mm wide slot 50, which accommodates a felt insert 52 which is 2mm larger than the size of the punch head 24 of either the upper punch 16 or the lower punch 18. As stated above, as the cleamng tool 42 passes through the cams 12, 14, the felt insert 52 wipes all the cam surfaces, removing old grease and remaining product.
As the cams 12, 14 are not often removed from the tablet press 10, the cleaning tool of the invention offers the opportunity to clean inaccessible areas of the cams 12, 14 while still in situ, reducing clean down times while maintaining a high standard of GMP (Good Manufacturing Practices). As grease and remnants of product granule act as a mild grounding paste, removing this from the cams 12, 14 with the cleaning tool 42, results in the life of the punch heads 16, 18 and the cams 12, 14 themselves being extended.
The cleaning tool of the invention may be used in place of various types of punches including keyed top punches, top punches and bottom punches which are not keyed, and B configuration and D configuration punches.
Although the cleamng tool 42 is illustrated with a felt insert 52, it is also possible to manufacture the cleaning tool 42 with a solid felt head, and shaft or from a plastics material with the head incorporating a plurality of bristles.

Claims

1. A method of cleaning a surface of a cam of a tablet press in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto, the method including the steps of:
(i) removing the punches from the tablet press; (ii) replacing at least one of the punches with a cleaning tool having a tool shaft similar to the punch shaft of the punch and a tool head attached to the tool shaft, the tool head being adapted to clean the surface of the cam; and (iii) rotating the tablet press to allow the cleaning tool to clean the surface of the cam.
2. A method according to claim 1 wherein in step (iii) the tablet press is rotated through at least one full revolution.
3. A method according to claim 2 wherein after step (iii) the cleaning tool is removed and cleaned and steps (ii) and (iii) are repeated one or more times.
4. A method according to any one of claims 1 to 3 wherein the cleaning tool has a tool head comprising a holder and a cleaning element located in the holder.
5. A method according to claim 4 wherein the cleaning element comprises a felt insert or a brush insert.
6. A method according to any one of claims 1 to 3 wherein the cleaning tool has a tool head designed as a cleaning element.
7. A method according to claim 6 wherein the cleaning element comprises felt or a plastics material carrying a plurality of bristles.
8. A cleaning tool for cleaning a surface of a cam of a tablet press in which tablet press the cam is adapted to operate on a plurality of punches which press the tablets, each punch having a punch shaft and a punch head attached thereto, the cleaning tool comprising a tool shaft similar to the punch shaft of the punch and a tool head attached to the tool shaft, the tool head being adapted to clean a surface of the cam.
9. A cleaning tool according to claim 8 wherein the tool head comprises a holder and a cleaning element located in the holder.
10. A cleaning tool according to claim 9 wherein the holder comprises a head section having a slot therein and the cleaning element comprises a felt insert or a brush insert adapted to be received and held in the slot.
11. A cleaning tool according to claim 10 wherein the head section is smaller than the equivalent punch head and the cleaning element is of approximately the same size as or is larger than the equivalent punch head.
12. A cleaning tool according to claim 8 wherein the tool head is designed as a cleaning element.
13. A cleaning tool according to claim 12 wherein the tool head is made of felt.
14. A cleaning tool according to claim 12 wherein the tool head is made of a plastics material carrying a plurality of bristles.
15. A cleaning tool according to claims 12 to 14 wherein the tool head is of approximately the same size as or larger than the equivalent punch head.
PCT/GB1998/003466 1997-11-18 1998-11-18 Method of cleaning a surface of a cam of a tablet press WO1999025545A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU11676/99A AU1167699A (en) 1997-11-18 1998-11-18 Method of cleaning a surface of a cam of a tablet press

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ZA97/10376 1997-11-18
ZA9710376 1997-11-18

Publications (1)

Publication Number Publication Date
WO1999025545A1 true WO1999025545A1 (en) 1999-05-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/003466 WO1999025545A1 (en) 1997-11-18 1998-11-18 Method of cleaning a surface of a cam of a tablet press

Country Status (2)

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AU (1) AU1167699A (en)
WO (1) WO1999025545A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8025498B2 (en) 2008-04-18 2011-09-27 Korsch Ag Rotary tableting press
CN110884196A (en) * 2019-10-28 2020-03-17 广东新乐食品有限公司 Automatic tabletting and forming device and method for double-layer tabletted sugar
EP3623145A1 (en) * 2018-09-13 2020-03-18 Fette Compacting GmbH Rotor for a rotary press

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948242A1 (en) * 1979-11-30 1981-06-04 Sandoz AG, 8500 Nürnberg Link guided press ram - has releasable ring with pin locking allowing several angular positions of ring
JPS58397A (en) * 1981-06-23 1983-01-05 Yamanouchi Pharmaceut Co Ltd Automatic cleaning and drying method for punch of tablet machine
JPS59218300A (en) * 1983-05-26 1984-12-08 Hata Tekkosho:Kk Washing method of rotary plate for rotary powder molding machine
JPH0394999A (en) * 1989-09-05 1991-04-19 Tsumura & Co Apparatus for manufacturing tablet
US5137440A (en) * 1991-01-28 1992-08-11 The Andrew Jergens Co. Brush cleaning mechanism for soap molding machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2948242A1 (en) * 1979-11-30 1981-06-04 Sandoz AG, 8500 Nürnberg Link guided press ram - has releasable ring with pin locking allowing several angular positions of ring
JPS58397A (en) * 1981-06-23 1983-01-05 Yamanouchi Pharmaceut Co Ltd Automatic cleaning and drying method for punch of tablet machine
JPS59218300A (en) * 1983-05-26 1984-12-08 Hata Tekkosho:Kk Washing method of rotary plate for rotary powder molding machine
JPH0394999A (en) * 1989-09-05 1991-04-19 Tsumura & Co Apparatus for manufacturing tablet
US5137440A (en) * 1991-01-28 1992-08-11 The Andrew Jergens Co. Brush cleaning mechanism for soap molding machines

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 007, no. 071 (M - 202) 24 March 1983 (1983-03-24) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 092 (M - 373) 20 April 1985 (1985-04-20) *
PATENT ABSTRACTS OF JAPAN vol. 015, no. 276 (M - 1135) 12 July 1991 (1991-07-12) *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8025498B2 (en) 2008-04-18 2011-09-27 Korsch Ag Rotary tableting press
EP3623145A1 (en) * 2018-09-13 2020-03-18 Fette Compacting GmbH Rotor for a rotary press
CN110893695A (en) * 2018-09-13 2020-03-20 菲特压片机械有限公司 Rotor for a rotary press
US11472145B2 (en) 2018-09-13 2022-10-18 Fette Compacting Gmbh Rotor for a rotary press
CN110884196A (en) * 2019-10-28 2020-03-17 广东新乐食品有限公司 Automatic tabletting and forming device and method for double-layer tabletted sugar

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