APPARATUS FOR FILLING CONTAINERS IN A STERILE ENVIRONMENT

Abstract: This invention relates to an apparatus for filling automa­ tically and in a sterile environment, bottles or other contain­ ers with pharmaceutical products or the like. The apparatus of the invention comprises an in-line (rectilinear) filling machine the operating elements of which are covered by a hood wherein a purified, de-humidified and laminar flow of air is circulated transversely and horizontally so as to traverse the path of travel of the bottles and lap the latter perpendicularly, in order to submit the bottles to a thorough and continuous scavenging action and prevent undesired particles from entering the bottles. The circuit for circulating the scavenging air flow through the protective hood is of closed type and includes high depuration filters and, bran­ ched across the blower, means for de-humidifying the air.

Description: Apparatus for filling containers in a sterile environment. This invention relates to an apparatus for filling automatically and in a sterile environment, bottles or other containers with pharmaceutical products or the like. The characteristics of this apparatus and the advantages resulting therefrom will be apparent from the following description of a preferred embodiment thereof, illustrated merely as a non-limitating example in the Figures of the three accompanying sheets of drawings, in which: Figures 1 and 2 are a side elevational view and a top plan view, respectively, of an improved filling machine according to the invention; Figure 3 is a diagrammatic cross-sectional view on the line III-III showing further details of the machine of Figure 2; Figure 4 is a diagrammatic view of the installation for conditioning the air in the hood enclosing the operating elements of the filling apparatus of the preceding Figures. At present, in order to fill the bottles automati= cally and in a sterile environment, automatic machines of any type, and also of rotary type, are used and are located in a sterile room and are usually provided with a hood of transparent material to protect the operating elements thereof; a suitable equipment will condition the air and circulate the same through the hood to maintain therein a suitably de-humidified and purified atmosphere. Exhaustive researches carried out by the applicant have shown that in order to package a pharmaceutical product in sterile conditions, a type of packaging or filling machine must be used that, for the reasons mentioned above, cannot be of rotary type, and must be preferably of in-line type and such as to present a minimum part of its operating elements above the path of travel of the bottles, thereby minimizing the polluting particles liable to detach from said operating elements and get into the bottles. An in-line filling machine of a type suitable to achieve the object specified above will be now briefly described with reference to Figures 1 and 2. This machine comprises a cabinet-shaped base portion A accommodating all the moving members. A horizontal rectilinear conveyor B carries a single row of bottles which will be cyclically stopped by intercepting means C-C', first at a station D where the doses of pharmaceutical product are admitted thereinto, and then at a station E where the bottles are sealed. The station D comprises a plurality of similar rotary units G and G' having a combined dosing and dispensing function and being characterized in that they are mounted on a single driving shaft H which, in turn, is arranged parallel to the longitudinal axis of the conveyor B. It is apparent that in such a machine the plan-view area of the units G-G' above the conveyor B is minimized, thus reducing the amount of polluting particles liable to fall from said units onto the bottles. According to the invention, the in-line filling machine, preferably of the type mentioned above, is provided with a preferably transparent and parallelepipedal hood 1 which encloses all the operative elements of the machine and is provided with openings 2-2' in the front and rear walls, respectively, as inlet and outlet for the bottles carried on the conveyor B. The side walls of the hood 1 are preferably parallel to the imaginary plane containing the longitudinal axis of the conveyor B. A portion of these side walls of the hood, having an extension defined by the rectangle 3 shown with dot-and -dash lines in Figure 1, and having the same length as the side walls but a smaller height than said walls and being at the same level as the conveyor B and lower portions of the units G-G' is defined by perforated diffusion regions 4-4' forming a part of the manifolds 5-5' which are connected, respectively, to the outlet of a source of filtered and de-humidified air having suitable pressure and flowrate characteristics, and to a suction source of suitable characteristics (see below). The holes or perforations in the regions 4 and 4' are preferably of the same size, are located on parallel and equally spaced rows and are in line with one another, the arrangement being such that, also by virtue of a suitable balance between the inlet into and outlet from the manifolds 5-5', the portion of space in the hood which is defined by the perforated regions 4-4' will be traversed by a horizontal air stream T, in the form of a laminar flow, which will lap the bottles V perpendicularly (see Figure 3), and will submit them to a thorough and and continuous scavenging action preventing any polluting particle from falling thereinto. The particular arrangement of the dosing and filling units G-G', as described with reference to Figures 1 and 2, is such that these units will be lapped trans= versely by the stream T and will present their rounded portion to said stream, thus avoiding the formation of vortexes at the mouths of the bottles, where continuous and linear characteristics are to be ensured to the stream T. As shown in Figure 2, the -conveyor B is located close to the wall 4 of the manifold 5, so that the bottles will be hit almost immediately by the scavenging air issuing from said manifold, thus ensuring a very efficient scavenging action. By limiting the action of the scavenging flow T to a fraction of the height dimension of the space enclosed by the hood 1, the following advantages are obtained: - first of all, simple and economical construction of the apparatus; - the spaces above and below the scavenging stream T are occupied by components of the machine some of which have considerable dimensions. Should these components be also lapped by the air stream, vortexes could be created that would certainly affect the evenness of the flow T; - a slightly reduced pressure (vacuum) can be created, at least in the upper portion of the scavenging flow T, for example by providing, at the ends -of the side wall to which the suction manifold 5' is connected, conduits 6-6' communicating at the bottom-rwith said manifold and at the top with the upper interior of the hood This provision causes a slow ascending -stream preventing any fall of polluting particles and permitting the conditioned air to reach also the uppermost regions in the hood, for example where the magazine of the product to be packaged is located. As shown in Figure 3, the filling apparatus of the invention is provided with suction intakes L at the units G-G' to collect and expel the powder of the product being dispersed during the passage of a dosed amount from said units into said bottles. Since the units G-G'' include components operating first by suction to form the doses of product and then by using compressed air either to expel said doses of product to be admitted into the bottles and to clean the dosing chambers, it is obvious that in order to ensure said condition of laminar flow for the scavenging stream T, the various pneumatic sources operating within the hood must be suitably balanced between each other. With reference to Figure 4, there will be now described the components of the installation used to circulate and condition the scavenging flow T traversing the hood. The pneumatic circuits operating either by pressurization and de-pressurization on the units G-G' form part of an independent circuit of the machine. The suction intakes L of the units G-G', however, are connected to the inlet of cyclones 7-7' for recovering the product being discharged from said intakes, the outlet of said recovery cyclones being connected to the inlet of a high depuration filter (so-called "absolute" filter) 8 to which the manifold 5' is also connected. The outlet of the filter 8 is connected to the suction mouth of a suitable electrically-operated blower 9 the outlet of which is connected to the manifold 5 through an absolute filter 10. The components 7, 7', 8 and 10 are preferably arranged within the sterile room K wherein the filling machine is located, and wherein a throttle 11 opens that is branched at the inlet of the filter 8 and permits to create in the hood 1 such an overpressure as to cause a continuous outflow of air from the openings 2-2' through which the bottles pass and to prevent any particles in the outer environment from entering the hood even in the case that a lid thereof is opened. Branched across the blower 9, through diaphrams 12,13 of suitable characteristics, is the composite air de-humidifying unit 14. Such an arrangement of the unit 14 permits the latter to operate with the maximum efficiency at all times and avoids any perturbation or limitation in the main pneumatic circuit connected to the hood 1. It is to be understood that the constructional details of the manifolds 5-5' have been omitted in this description, the latter being provided with internal baffles and other provisions to maintain the pressure of the air flowing out and into the holes, respectively, of the diffusion regions 4-4' as constant as possible. The description has also been omitted of the details concerning the pressure and flowrate values of the air qutflowing from the diffusers 4-4', because they are easily obtainable by those skilled in the art through experimental tests, and because these values may vary as a function of the size and volume of the space enclosed by the hood 1. It is also to be understood that the description concerns a preferred embodiment of the invention, and that various changes and modifications, especially of con= structional nature, may be made thereto without departing from the basic principle of the invention as set forth above, as shown in the Figures of the accompanying three sheets of drawings and as claimed hereinafter.

Claims: CLAIMS 1. An apparatus for filling automatically and in a sterile environment, bottles or other containers with a pharmaceutical product or the like, comprising an in-line machine wherein the bottles (V) are moved in a single row on a rectilinear path of travel (B) along which they are stopped cyclically by suitable means (C-C'), firstly at one or more stations (D) for admitting doses of product thereinto and subsequently at least at a sealing station (E), said stations for forming and dispensing the doses of product being preferably of rotary type and having an axis (H) which is parallel to the longitudinal axis of the path of travel of the bottles; said apparatus being characte= rized by the fact of comprising a preferably parallelepipedal transparent hood (1) with side walls which are parallel to the imaginary plane containing the longitudinal axis of the conveyor for the bottles, said hood being formed with inlet and outlet openings (2,2') for the bottles in the front and rear walls thereof, respectively, and being provided on the side walls thereof with manifolds (5,5') including perforated diffusion surfaces (4,4') co-extensive with the entire length of said walls; one of said manifolds (5) being connected to a source for admitting suitably purified and de-humidified air into the hood, and the other (5') being connected to a suction source of such characteristics whereby the in-terior of the hood shall be traversed by an air stream (T) having a laminar flow that hits the bottles (V) perpendicularly and submits them to a thorough and continuous scavenging action to prevent any undesired particle from falling thereinto. 2. An apparatus according to claim 1, characte= rized in that the suction and delivery manifolds (5,5') are connected to a closed circuit including an electrically -operated blower (9) of suitable characteristics including absolute filters (8,10) upstream and downstream of said blower; the suction stretch of said circuit, immediately downstream of the manifold (5') connected to said hood, having branched thereon an adjustable throttle (11) which opens into the sterile room wherein said filling machine and absolute filters are located, the arrangement being such that by operating the latter device on overpressure can be formed in the hood of such characteristics whereby no particle from the outer environment is allowed to enter said hood. 3. An apparatus according to claim 2, characte= rized in that connected across the blower (9), in the main pneumatic circuit for the hood, through calibrated or calibratable nozzles, there is a circuit (12,13,14) with means for de-humidifying the air to be admitted into the hood. 4. An apparatus according to claim 2, characte= rized in that connected at the inlet of the filter (8), on the suction side of the blower (9) there are cyclones (7,7'), having operatively connected thereto the intakes operating in proximity of the units for metering and dispensing the doses of product on the filling machine. 5. An apparatus according to claim 1, characte= rized in that the delivery and suction manifolds (5,5') connected to the hood are of a smaller height than the side walls of the hood and are positioned at such a level whereby the scavenging air stream (T) will sweep mainly and at least the bottles (V), or the upper portion of the bottles of any size utilized in the filling machine. 6. An apparatus according to claim 1, characte= rized in that at the ends of the side wall of said hood, to which the suction manifold (5') is connected, conduits (6,6') are provided communicating at the bottom thereof with said manifold and at the top thereof with the upper portion of the space enclosed by the hood, the arrangement being such as to cause, above the scavenging stream (T) for the bottles, a gentle ascending stream preventing any fall of undesired particles and permitting the conditioned air to reach also the uppermost regions in the hood, for example where the magazine of the product to be packaged is located. 7. An apparatus according to claim 1, wherein the conveyor for the bottles is arranged as near as possible to the diffusion wall (4) of the manifold (5) delivering the scavenging air, whereby the scavenging action on the bottles will have the maximum efficiency.

Inventors: FARNETI, ARRIGO
Applicants: ZANASI S.P.A.
Application year: 1983
Main classification: B65B31
IPC codes: B65B55, B65G69, B67C3, B65B1