EP0737644B1 - Dispositif d'embouteillage pour liquides - Google Patents

Dispositif d'embouteillage pour liquides Download PDF

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Publication number
EP0737644B1
EP0737644B1 EP96250083A EP96250083A EP0737644B1 EP 0737644 B1 EP0737644 B1 EP 0737644B1 EP 96250083 A EP96250083 A EP 96250083A EP 96250083 A EP96250083 A EP 96250083A EP 0737644 B1 EP0737644 B1 EP 0737644B1
Authority
EP
European Patent Office
Prior art keywords
filling
container
suction
containers
arrangement according
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
EP96250083A
Other languages
German (de)
English (en)
Other versions
EP0737644A1 (fr
Inventor
Jacek Ziolek
Janusz Kmiecik
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.)
PWA Geraete und Apparatebau GmbH
Original Assignee
PWA Geraete und Apparatebau GmbH
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 PWA Geraete und Apparatebau GmbH filed Critical PWA Geraete und Apparatebau GmbH
Publication of EP0737644A1 publication Critical patent/EP0737644A1/fr
Application granted granted Critical
Publication of EP0737644B1 publication Critical patent/EP0737644B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/22—Details
    • B67C3/26—Filling-heads; Means for engaging filling-heads with bottle necks
    • B67C3/2634—Filling-heads; Means for engaging filling-heads with bottle necks specially adapted for vacuum or suction filling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/16—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus using suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B67—OPENING, CLOSING OR CLEANING BOTTLES, JARS OR SIMILAR CONTAINERS; LIQUID HANDLING
    • B67C—CLEANING, FILLING WITH LIQUIDS OR SEMILIQUIDS, OR EMPTYING, OF BOTTLES, JARS, CANS, CASKS, BARRELS, OR SIMILAR CONTAINERS, NOT OTHERWISE PROVIDED FOR; FUNNELS
    • B67C3/00—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus; Filling casks or barrels with liquids or semiliquids
    • B67C3/02—Bottling liquids or semiliquids; Filling jars or cans with liquids or semiliquids using bottling or like apparatus
    • B67C3/22—Details
    • B67C3/26—Filling-heads; Means for engaging filling-heads with bottle necks
    • B67C2003/2671—Means for preventing foaming of the liquid
    • B67C2003/2674—Means for preventing foaming of the liquid by creating a conical shaped flow directed to the container wall at the container neck height
    • B67C2003/2677—Means for preventing foaming of the liquid by creating a conical shaped flow directed to the container wall at the container neck height by means of a deflector

Definitions

  • the invention relates to a filling device for in from storage containers Portion containers liquids to be dosed according to the generic term of claim 1.
  • Bottle filling machines are considered industrial machines for high Number of pieces known in various ways, e.g. Filling machines for commercial beverages, where on a carousel or in Matrix arrangement of a large number of bottles simultaneously or shortly after each other with a corresponding filler plug automatic opening of the inflow line and termination of the filling process known when the predetermined liquid level is reached.
  • Such machines are not suitable for small portioning companies, e.g. Winegrowers or distributors for various types of liquids, e.g. Chemical laboratories. Filling systems are preferred there, where the Portion containers to be filled in small batch sizes with fast if necessary changing liquids.
  • Two versions of such a filling device are known from the Polish utility model 45 791 and 45 793.
  • One or more bottles are pushed under a filler plug against the pressure of a coil spring and then sealed by the filler plug and filled standing on a support bar.
  • a tube is pushed into the bottle neck by the spring, which tube is connected on the other hand to a storage container.
  • a second pipe leads from the fill plug to a suction tank.
  • the suction container is arranged above the storage container with the liquid to be filled, the storage container in turn resting on a frame.
  • the bottle filling arrangement itself is arranged on a stand of this frame, specifically above the storage container at approximately the level of the suction container.
  • the suction tank has a drain line or a drain valve to the storage tank.
  • the suction container forms an empty chamber, which is connected to the filler plugs by means of the second pipes, which serve as an overflow line, and is connected to a vacuum pump by means of a suction line.
  • the overflow lines are led into the suction tank from above, while the drain line is arranged on the underside, which is closed by a flap-like valve at negative pressure in the suction tank and opens at normal pressure due to the liquid or gravity flowing into the suction tank and the liquid into the Allows the reservoir to run back.
  • the suction pump is constantly in operation and when the desired filling level is reached, the further amount of liquid delivered flows over an overflow line to the suction tank. An operator must therefore be constantly careful and replace the filled bottle with a new one, otherwise the bottle will only be rinsed and the suction container filled.
  • Polish utility model 49073 becomes when the liquid level in the suction tank rises Float valve switched, which connects the suction line to the vacuum pump closes. At this moment there is no longer any negative pressure in the Suction container, so that the amount of liquid accumulated there Storage tank flows back.
  • the arrangement of the Check valves for the suction line and the flap check valve creates a cleaning problem and gives cause for concern possible malfunction when closing the suction line or the dimensioning restoring force of the flap for the drain line.
  • a generic filling device is known, with which liquids can be dosed from storage containers into portion containers.
  • the portion container is connected to a suction line from a storage container via a filler plug, and the compressed gas flow or the overflow line is discharged centrally from the portion container through the filler plug and connected to a suction container.
  • This suction container can drain entrained liquid via a valve protruding into the storage container.
  • the vacuum is generated by a vacuum pump, which switches on the return gas flow or the overflow line via a control valve and, on the other hand, acts on a servo motor that actuates the filler plug.
  • the system becomes relatively complex due to the valve control of the suction container as well as the control valve in the vacuum line and the servo motor, and a larger amount of the liquid obviously has to be returned to the storage container via the suction container.
  • the large number of components and the complex control valve can make the device expensive and maintenance-intensive.
  • the filling process is started by switching the valve and when the filling process is finished, the control valve is actuated again. The operator must also operate the control valve in addition to changing the bottle.
  • the filler plug for the opening of the container to be filled has a housing with a circular feed to the container for a filling line coupled to it and a central overflow line, the end of which is shaped like a plug. Above this plug is an inlet opening in the overflow line. If the filling flow is interrupted, the stopper closes the delivery line by lifting the servomotor.
  • a servo motor serves six filling plugs so that the filling of the majority of the bottles begins and ends at the same time.
  • the invention is based on the problem, the devices according to the state of the art for manually operated Filling devices for small batch sizes or quickly changing ones Improve types of fluids and the handling and function of the To optimize the machine.
  • the novel filling device for liquids to be dosed from storage containers into portioning containers, comprises filling and overflow lines similar to the prior art, which are provided on the one hand with appropriate filling plugs on the portion container for tightly closing its filling opening and on the other hand are immersed in the liquid of the storage container.
  • a suction tank is integrated into the overflow line, to which a pressure-lowering device, e.g. a gas pump or vacuum pump or other suction device known per se with a corresponding suction line, is permanently connected in the upper area, and on the other hand, preferably in the bottom area, there is an inlet line for overflow quantities resulting from the bottle filling and has a drain line to the reservoir.
  • the three types of containers namely storage containers, portion containers and suction containers, are found in this sequence at staggered height levels and are connected to each other by communicating tubes.
  • the suction container has a separating bell, which on the one hand separates the mouth of the suction line against incoming and outgoing liquids in the suction chamber of the suction container, which is under suction, and on the other hand, because the separation device is gas-permeable, both the suction chamber and the collecting chamber and the pipes connected to it remain connected to the pressure reduction device, as a result of which there is negative pressure or at least suction in the entire system.
  • the pressure reduction device in combination with the communicating tubes is designed so that there is a negative pressure in the system that is able to lift the liquid to be filled in the overflow line from the portion container or in its return connection from the suction container to the storage container so that the Column below the collecting chamber of the suction container, which sits at the highest point of the filling device, comes to a standstill during the filling process of the portion containers, for example bottles or cans. Only when the containers to be filled have the desired liquid level and are removed from the filling device, can the liquid in the overflow line on the inlet path to the collecting chamber be sucked into the collecting chamber by the negative pressure in the suction container and from there runs back via the return line into the storage container .
  • the suction container is connected to the filling line via an overflow line happens in the bottom area with an inlet to the collecting chamber and a drain in the direction as close as possible Storage container. This may result in an overflow pipe into the Liquid entering the drainage chamber drain off directly without the There is a risk that excess liquid in the suction line to the pressure sink device.
  • the collecting chamber of the suction chamber separating bell designed so that liquid entering the concave Side of the bell hits and flows back towards the drain line.
  • the filling plug or the supplied filling line has a valve, preferably an automatic check valve, which prevents the contents currently in the filling line from flowing back into the portion container.
  • a valve preferably an automatic check valve
  • the device according to the invention can also be used to convey gas-evolving liquids, for example containing carbon dioxide, which, for example, are also to be partially degassed. Dispersions which can separate by circulation according to the methods according to the prior art can also be easily filled or portioned with this device.
  • the device can not only be used to fill small containers, but also wherever a vacuum can be generated in the system to be filled, for example at petrol stations for oil changes or in chemical processes where a container has to be refilled. Overfilling must be prevented by the position of the mouth of the overflow line, so that toxic or aggressive liquids can also be filled.
  • the filler plug has a centrally arranged one Overflow line and a preferably side feed for one Fill line, which ends in the fill plug in a check valve, behind which the liquid in one, the overflow line at least partially enclosing channel can reach.
  • This channel opens below one seal the container to be filled as airtight as possible a ring opening or in side outlets, for example in front of one Baffle-like lock. This will direct the liquid to the Wall of the container neck rinsed, from which you then without vortex formation can drain off. The liquid is soothed immediately and cannot foam.
  • the suction container and the portion container can be on the same Stands can be arranged above the storage container for Cleaning purposes can be easily dismantled.
  • the stand can be tubular Suction line between the pressure lowering device and the suction tank be formed or at least as a protective jacket for one Serve vacuum hose.
  • the suction container can advantageously be connected to several portion containers at the same time via overflow lines, but has only one central outlet from the collecting chamber.
  • the portioning containers can be arranged in rows on corresponding supports on the stand or frame. If a large number of portion containers, for example 6, 8 or 10, are to be filled at the same time, it makes sense that the portion containers are arranged on a circular support bar which is arranged as a ring around the stand, ie around the suction container.
  • This support bar for the portion container can also be designed as a turntable, so that the operator can always bring a new bottle or a new portion container into the filling device at the same location and also remove the portion container at the same location.
  • the stand or the suction line can be equipped with a largely gas-tight sleeve in which the suction container with complementary socket is inserted. This allows the Slightly remove and clean the suction container.
  • the filling plugs are pivotally attached to one end of a leaf spring designed as a holder, which is fixed to the stand at the other end.
  • the free end of the leaf spring for example a flat stainless steel strip or plastic strip, hangs a little in the rest position when there is no portion container due to its own weight or slight load due to the filler plug.
  • the moment of resistance of the leaf spring is designed so that it is just sufficient to press the filler plug onto the portion container, on the other hand the spring force is not so great that the operator has to exert large forces. Since the leaf spring can be pivoted about its fixing point on the stand, no further guidance of this spring is required, as is customary in the prior art. A leaf spring is also easy to clean. Another advantage of the leaf spring is that containers can also be filled that are not clamped in the vertical direction, because the filling opening is arranged laterally or obliquely from above in the portion container. For this purpose, the leaf spring is only rotated by the required degree of angle in order to be able to ensure a tight closure of the container with the filler plugs even in such a position. By turning the leaf spring, its section modulus remains the same regardless of the position.
  • the inventive Filling device in particular also for filling several Portion container at the same time, a single portion container in each case removed immediately after filling or even during filling and be replaced by an empty container during the filling process for the remaining containers.
  • the overflow and reflux quantities are essential to the filling device less than in the system according to the prior art, because none or only small amounts via overflow or drain lines, storage containers and fill lines circulate, but once sucked in and filled will.
  • the filling time can also be changed by dimensioning the cross sections of the lines, which are generally in the form of hoses, or by adjusting the suction power or the vacuum by other measures.
  • Other parameters that influence the filling time or cycle time as well as overflow quantities are the height arrangement of the containers and the diameter ratio of the different suction and filling lines. By varying the parameters, consideration can also be given to the viscosity and / or surface tension of the substances to be transferred.
  • the storage container this is only of secondary importance for the invention, with Level indicators and / or limiters may be provided.
  • Figure 1 shows a filling device in section, for a filling of Fruit juice in bottles 17 is suitable.
  • a rack 1 below whose one suction pump 31 is arranged is a stand 33 for one Support bar 18 on which the bottles 17 to be filled are placed can be arranged.
  • a stand 2 on the frame 1 arranged which carries a reservoir 6 on a first platform a second height position fixed a leaf spring 4 at its free end a fill plug 3 is attached.
  • the lower part of the suction container forms one Collection chamber 14 and is from the suction chamber 13 through a Separating bell 12 divided, the one to the outer jacket of the container 5 gas-permeable annular gap 15 forms, so that also in the Collection chamber can form a negative pressure generated by the pump.
  • An outlet 21 leads from the collecting chamber via a return hose 7 in the reservoir 6, the liquid level is indicated.
  • Out a fill line 8 leads to the filling plug 3 and from the storage container this to the inlet 20 of the suction tank an overflow line 19, wherein the overflow line a pipe 16 for level limitation within the Bottle 17 added.
  • the filling device described is characterized by a very simple Construction and a stable reliable function and enables thereby a constant filling of bottles without any Switching functions are required.
  • the lines have no valves and the individual parts, such as suction tank, stand or suction pipe 11, and the flexible hose lines 7, 8 and 19 can be removed and are cleaned with common cleaning agents and methods.
  • FIG. 2 shows the entire system with a battery of six fill plugs, only one bottle 17 is shown on the support bar 18. It is easy to see that a single suction tank 5 with a corresponding Suction line to the pump, not shown here, is sufficient to Many overflow lines 19 to operate, but only the individual one shown bottle can be filled alone.
  • FIG. 3 shows a section AA according to FIG. 4 through a device with two bottles 27 to be filled, which rest on a support bar 28, which in turn is fastened to the stand 33 with the adjustment variations V.
  • the stand rests on a table 22 shown and at the same time has the function of holding the bottle in the selected position.
  • a leaf spring 24 is fastened to the stand 2 by means of a bush 26 and a locking means 25.
  • This stainless steel leaf spring is shown in different positions a, b and c. At the free end of the leaf spring, which is seated here in the filling position B, the filling plug 23 is held, in which the filling line 30 and an overflow line 29 end.
  • the leaf spring has the dashed position A and is bent into position C by pushing the bottle under the filling plug 23.
  • the steel spring 24 returns to position B and in doing so presses the filler plug 23 onto the bottle 27 and this at the same time onto the support bar 28, so that the filling process can now begin and a vacuum in the bottle is built up.
  • Figure 4 shows an arrangement according to Figure 3 in plan view, however two leaf springs 24 which are locked on the common cross member 32 and held by stand 22.
  • the reservoir and the The suction container and the vacuum pump are not in this case either shown, but can be arranged similarly as in Figures 1 and 2.
  • FIG. 5 shows in an enlarged representation and in section a filling situation analogous to FIG. 1, but with a different filling plug 35.
  • This is pressed onto the bottle 17 by means of a leaf spring 4, to which it is connected by a screw connection 40, so that the seal 34 closes the portion container opening airtight.
  • the central overflow pipe 39 which is arranged in the housing 38, is part of the overflow line (not shown further) and ends in each case in connection pieces 41 for hoses.
  • the level hose 36 with its length H, determines the maximum level of the liquid W in the bottle 17, since the air suction S is then interrupted as soon as the liquid level reaches the mouth of the hose 36.
  • the liquid W is sucked in via the filling line 8, passes the check valve 37, and flows through the annular channel 42 concentrically surrounding the overflow pipe 39 through the annular gap 43, here set to the filling gap width F, into the bottle 17.
  • the flow is set so that the Liquid W runs off the bottle wall in a vortex-free manner.
  • the vacuum breaks down in the interior of the bottle and in the ring channel and thus closes the valve 37 in the filling line 8.

Landscapes

  • Filling Of Jars Or Cans And Processes For Cleaning And Sealing Jars (AREA)
  • Basic Packing Technique (AREA)

Claims (9)

  1. Dispositif de remplissage pour les liquides devant être dosés à partir de récipients de stockage (6) dans des récipients par portion (17, 27) comprenant :
    des conduites de remplissage et de trop-plein (8, 30; 7, 16, 19, 29, 36, 39) reliant les récipients et qui d'une part sont immergées dans le liquide dans le récipient de stockage (6) et d'autre part se terminent sur le récipient par portion (17, 27) dans un bouchon de remplissage (3, 23, 35) approprié pour la fermeture étanche de son orifice de remplissage,
    un dispositif d'abaissement de pression pour la génération d'une dépression par rapport à la pression ambiante dans
    un récipient d'aspiration, disposé sur un niveau au-dessus du récipient par portion,
       caractérisé en ce que le récipient d'aspiration (5) est divisé en une chambre d'aspiration (13) avec communication permanente (2, 11) ouverte et directe avec le dispositif d'abaissement de pression (31) et une chambre de réception (14), qui constitue une partie de la conduite de trop-plein (19, 29, 7), au moyen d'une cloche de séparation (12) perméable au gaz et protégeant la communication permanente du liquide.
  2. Dispositif de remplissage selon la revendication 1, caractérisé en ce que la conduite de trop-plein (19, 29 et 7) présente dans la zone du fond du récipient d'aspiration une arrivée (20) venant du bouchon de remplissage (3, 23, 35) et une sortie (21) disposée à côté et allant vers le récipient de stockage (6).
  3. Dispositif de remplissage selon l'une quelconque des revendications précédentes, caractérisé en ce que le récipient d'aspiration (5) et les récipients par portion (17, 27) sont disposés sur un montant (2) commun au-dessus du récipient de stockage (6).
  4. Dispositif de remplissage selon l'une quelconque des revendications précédentes, caractérisé en ce que le montant (2) est réalisé au moins partiellement sous la forme d'une conduite d'aspiration (11) tubulaire entre le dispositif d'abaissement de pression (31) et le récipient d'aspiration (5).
  5. Dispositif de remplissage selon l'une quelconque des revendications précédentes, caractérisé en ce qu'à chaque récipient d'aspiration (5) sont affectés plusieurs récipients par portion (17, 27) avec des arrivées (20) appropriées, mais avec seulement une sortie (21) des conduites de trop-plein, les récipients par portion (17, 27) pouvant être positionnés sur une baguette d'appui (18, 28) réalisée sous la forme d'une table tournante.
  6. Dispositif de remplissage selon l'une quelconque des revendications précédentes, caractérisé en ce que le montant (2) ou la conduite d'aspiration (11) est pourvu d'un manchon (10) largement étanche au gaz, dans lequel on petit mettre le récipient d'aspiration (5) avec la tubulure (9) conçue de façon complémentaire.
  7. Dispositif de remplissage selon l'une quelconque des revendications précédentes, caractérisé en ce que les récipients par portion (17, 27) sont bloqués pendant le remplissage entre une baguette d'appui (18, 28) fixe et un bouchon de remplissage (3, 23) maintenu de façon pivotante sur l'extrémité libre d'un ressort à lames (4, 24), le ressort à lames étant fixé avec son extrémité libre sur le montant (2, 22).
  8. Dispositif de remplissage selon l'une quelconque des revendications précédentes, caractérisé en ce que le ressort à lames (4, 24) est conçu de façon qu'il ait son couple de résistance le plus faible vis-à-vis de la flexion dans la direction d'axe avec l'orifice de remplissage du récipient par portion (17, 27).
  9. Dispositif de remplissage selon l'une quelconque des revendications précédentes, le bouchon de remplissage présentant un boítier avec une arrivée de forme circulaire au récipient pour une conduite de remplissage, laquelle entoure une conduite de trop-plein centrale avec un limiteur du niveau de remplissage, et un joint pour l'orifice du récipient, caractérisé en ce que l'arrivée (42) peut être fermé avec un clapet antiretour (37) pouvant être commandé par dépression et l'arrivée se termine dans une fente (43) latérale ouverte au-dessous du joint (34), mais au-dessus du limiteur du niveau de remplissage (36), de telle manière que le liquide (w) soit lavé directement sur la paroi du récipient (17).
EP96250083A 1995-04-13 1996-04-15 Dispositif d'embouteillage pour liquides Expired - Lifetime EP0737644B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
PL10248895 1995-04-13
PL10248995 1995-04-13
PL10248995 1995-04-13
PL10248895 1995-04-13

Publications (2)

Publication Number Publication Date
EP0737644A1 EP0737644A1 (fr) 1996-10-16
EP0737644B1 true EP0737644B1 (fr) 1998-12-09

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP96250083A Expired - Lifetime EP0737644B1 (fr) 1995-04-13 1996-04-15 Dispositif d'embouteillage pour liquides

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EP (1) EP0737644B1 (fr)
AT (1) ATE174308T1 (fr)
DE (1) DE59600931D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMO20050309A1 (it) * 2005-11-22 2007-05-23 Dipran S R L Dispositivo e relativo procedimento di riempimento a basso livello di vuoto di contenitori rigidi con liquidi piatti non frizzanti
CN109399532A (zh) * 2018-10-30 2019-03-01 满金坝(深圳)科技有限公司 自动抽液机
CN110406705A (zh) * 2019-09-06 2019-11-05 郑玉波 灌装装置和安全灌装***

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2809677A (en) * 1955-07-18 1957-10-15 Vacuum Motor Corp Bottle filling apparatus
DE1093246B (de) * 1957-03-16 1960-11-17 Hans Steinert Vorrichtung zum Fuellen von Flaschen und anderen Gefaessen mit Fluessigkeit mittels eines unter Unterdruck stehenden Abspritzbehaelters
US3056436A (en) * 1959-06-24 1962-10-02 Cherry Burrell Corp Filling head for filling machines
US3580299A (en) * 1968-11-21 1971-05-25 Jorge Alkalay Container filling device

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Publication number Publication date
EP0737644A1 (fr) 1996-10-16
ATE174308T1 (de) 1998-12-15
DE59600931D1 (de) 1999-01-21

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