A process and installation for processing grape juice

Abstract

The invention relates to a method for treating grape juice in a collector (4) located downstream of a press (2) equipped with a pressing chamber (3), and having an inlet (51) in direct fluidic communication with the pressing chamber (3) of said press (2). The method comprises a step of determining a parameter representative of the quantity of juice in the collector (2), a step of feeding said collector (4) with fining agents according to the determined quantity of juice in the collector (4), and a step of agitating the contents of said collector (4). Figure for the abstract: Fig. 1

Description

Title of the invention: Method and installation for treating grape juice

[0001] The present invention relates to a method and an installation for treating grape juice.

[0002] It relates in particular to a method for treating grape juice in a collector arranged downstream of a press equipped with a pressing chamber, said collector having an inlet in fluid communication, that is to say in direct connection, with the pressing chamber of said press.

[0003] It is known that the quality of grape juices produced during pressing varies. The first juices extracted at low pressure come from the pulp zone of the grape berry while the juices extracted later at higher pressure come from the skin zone of the grape berry. Here, pulp is understood to mean the soft part of the grape berry excluding the seeds. This change in the composition of the juices during pressing involves the separation of the juices at the end of pressing. Thus, after passing through a juice collector, the juices from the pulp zone are collected in a first tank while the juices from the skin zone are collected in a second tank. The lower quality juices from the skin zone can, after separation from the juices from the pulp zone, be treated with fining agents. Fining agents are well known to those skilled in the art, as illustrated for example by patent EP-3,222.707. Indeed, grape juices contain soluble compounds which, over time, can become unstable and generate cloudiness, such as tannins and proteins. The addition of fining agents, capable of reacting with these unstable and / or reactive compounds and of flocculating and sedimenting by carrying away suspended particles and / or unstable soluble compounds, makes it possible to increase the clarity of the juices, their filterability and their stability and to improve their organoleptic qualities. Once the juices from the skin zone of the grapes have been treated, they can be mixed with the juices from the pulp zone. The process described above is long, tedious and requires two juice recovery tanks downstream of the collector and a juice separator. This process also requires handling, after treatment and settling, the juices from the skin zone to mix them with the juices from the pulp zone.Furthermore, processing with bonding agents is often imprecise.

[0004] An aim of the present invention is to propose a method for treating grape juice which is faster to implement and less tedious.

[0005] Another object of the present invention is to provide a treatment installation juices whose design allows for a more compact, simplified installation.

[0006] To this end, the invention relates to a method for treating grape juice in a collector arranged downstream of a press equipped with a pressing chamber, said collector having an inlet in direct fluid communication with the pressing chamber of said press, characterized in that said method comprises a step of determining a parameter representative of the quantity of juice in the collector, a step of supplying said collector with fining agents as a function of the determination of the quantity of juice in the collector, and a step of stirring the contents of said collector. The inlet of the collector is in fluid communication or in direct connection with the pressing chamber, that is to say that no tank is interposed between the collector and the pressing chamber. The contents extracted from the pressing chamber reach the collector directly.The addition of fining agents directly into the collector in direct fluid communication with the pressing chamber eliminates the need for the separate collection step of the juices in two separate tanks downstream of the collector. This results in tank savings. The treatment is carried out in line so that ultimately a single juice is obtained. The agitation of the juices at the collector level allows a homogeneous juice / fining agent mixture to be obtained, ensuring greater effectiveness of the fining agents in a short time. The treatment of the juices with fining agents takes place as soon as they are extracted, so that the quality of the juices is improved. In addition, the quantity of fining agents can vary depending on the nature of the juices collected without complicating the treatment.

[0007] According to one embodiment of the method, said method comprises, before the step of supplying said collector with fining agents, a step of determining the nature of the collected juices to distinguish the juices from the pulp area of ​​the grape berries from the juices from the skin area of ​​the grape berries. Thus, the operator can decide whether or not to treat all of the extracted juices with the fining agents.

[0008] According to one embodiment of the method, the step of supplying the collector with fining agents is carried out in the collector on the juices from the skin area of ​​the grape berries. Thus, as a priority, the juices from the skin area of ​​the grape berries can be treated with the fining agents.

[0009] According to one embodiment of the method, the gluing agents are chosen from the group formed by mineral gluing agents, such as bentonite, silica gel, granular gluing agents, such as polyvinylpolypyrrolidone (PVPP), protein gluing agents, in particular of plant or animal origin, such as egg albumin, casein, gelatin, pea proteins, potato proteins, such as patatin. The choice of gluing agents with a flo speed culation, i.e. a high variation in the number of aggregated particles over time, allows processing in a short time. Online batch processing as described above can thus be implemented under excellent conditions.

[0010] The invention also relates to a grape juice processing installation, said installation comprising a press comprising a pressing chamber and a collector arranged downstream of the press, said collector comprising an inlet in direct fluid communication with the pressing chamber of the press, characterized in that the installation comprises a device for determining a parameter representative of the quantity of juice in said collector, a system for stirring the contents of the collector, a system for supplying fining agents to said collector and a control unit configured to control the system for supplying fining agents to the collector as a function of data provided by the device for determining a parameter representative of the quantity of juice in said collector. This installation, in particular for implementing the method described above, is characterized by its simplicity and compactness.Thus, the juices extracted from the pressing chamber and collected in the collector are defined at least quantitatively in the collector to best adapt the treatment into fining agents. The presence of an agitation system in the collector allows for homogeneous and rapid treatment of the collected juices. Carrying out the treatment directly at the collector level allows for in-line batch processing. Each batch of treated juice can then be sent to a single common juice receiving tank.

[0011] According to one embodiment of the invention, the installation comprises a system for determining the nature of the juices collected in the collector to distinguish the juices from the pulp area of ​​the grape berries from the juices from the skin area of ​​the grape berries. The presence of a system for determining the nature of the juices collected at the collector makes it possible to adapt the treatment according to the quality of the juices. It can thus be decided to exempt the juices from the pulp area from any treatment.

[0012] According to one embodiment of the invention, the system for determining the nature of the collected juices comprises at least one pH measuring device equipping the collector and / or a pressure measuring device equipping the press and / or a device for measuring the volume of juice extracted from the press and / or a pressing time counter.

[0013] According to one embodiment of the invention, the device for determining a parameter representative of the quantity of juice in said collector comprises at least one level sensor and / or a pressure sensor arranged at the collector. The concentration of fining agents can thus be adapted to each batch in the collector.

[0014] According to one embodiment of the invention, the stirring system is a rotary mechanical system, preferably with blades or propellers and / or an air blowing system.

[0015] According to one embodiment of the invention, the system for supplying fining agents to said collector comprises at least one tank for storing fining agents and at least one device for transferring the contents of the storage tank to the collector. The control unit is thus configured to control the transfer device, such as a metering pump, as a function of data provided by the device for determining a parameter representative of the quantity of juice in the collector. Brief description of the drawings

[0016] The invention will be better understood on reading the following description of exemplary embodiments, with reference to the appended drawing in which:

[0017] [Fig-1] represents a schematic view of a treatment installation in accordance with the invention.

[0018] As mentioned above, the invention relates to a method for treating grape juice in a collector 4 arranged downstream of a press 2 equipped with a pressing chamber 3 as well as an installation 1 in particular for implementing the method. An example of such an installation 1 is provided in [Fig.l]. This installation 1 comprises a press 2 comprising a pressing chamber shown at 3 in the figures. By pressing chamber is meant a chamber of variable volume inside which the whole or destemmed and crushed grape harvest is poured. The variation in volume of the chamber can be obtained by different means depending on the nature of the press which can be a screw, plate or pneumatic press, as in the example shown where the press is a membrane press, the membrane being shown at 11 in the figures.

[0019] Pressing, that is to say pressing the harvest in order to extract the juices, is carried out by varying the volume of the pressing chamber 3 in the direction of a reduction in the volume, in a manner known per se.

[0020] In the example shown in [Fig.l], the pressing chamber is a chamber partially delimited by the deformable membrane 11. In fact, the press comprises a tank housing the membrane 11 which separates the tank into the pressing chamber 3 and a control chamber 12.

[0021] This control chamber 12 is separated from the pressing chamber 3 by the membrane 11. This control chamber 12 can be pressurized by connection to a compressed air source. This pressurization of the control chamber 12 causes a deformation of the membrane 11 in the direction of a reduction in the volume of the pressing chamber 3. This control chamber 11 can also be put under depression to return the membrane to its undeformed state in which it is pressed against a wall of the tank, as illustrated in [Fig.l].

[0022] The pressing chamber 3 is equipped with a juice outlet 31.

[0023] Generally, the pressing chamber 3 is equipped with drainage means for example in the form of longitudinal drains extending, in the example shown, parallel to the longitudinal axis of the tank which is a cylindrical tank with a horizontal longitudinal axis. The contents of these drains are evacuated through the juice outlet 31 of the pressing chamber 3.

[0024] The treatment installation 1 also comprises a collector 4 in this case in the form of a tank arranged downstream of the press and in particular of the pressing chamber 3 of the press 2. The pressing chamber 3 is equipped with a juice outlet 31. This collector 4 is here arranged under the juice outlet 31 of the pressing chamber 3 for gravity collection of the juices from the pressing chamber 3. Alternatively, the collector 4 may be connected at the inlet by a conduit to the juice outlet 31 of the pressing chamber 3. The fluid communication between the collector 4 and the press, in particular the pressing chamber 3, may therefore take place with or without a connection device.Regardless of the design of the collector 4, the inlet 51 of the collector 4 is always in direct fluid communication with the juice outlet 31 of the pressing chamber 3 to directly collect the juices from the pressing chamber 3 without passing through an intermediate tank.

[0025] The collector 4 is also here equipped with an outlet shown at 52 in the figures. This outlet is provided in the bottom of the collector. This outlet is a closable outlet provided with a closing member 14, such as a valve, controllable by the control unit 9 which will be described below.

[0026] Alternatively or additionally, the collector 4 may, for its emptying, be equipped with a pump. The contents of this collector 4 are intended to be evacuated to a juice storage tank shown at 13 in [Fig.l]. The juice outlet 31 of the pressing chamber 3 and / or the inlet 51 of the collector 4 may be equipped with a shut-off member, such as a valve, controllable by the control unit to isolate the pressing chamber 3 from the collector 4.

[0027] The installation 1 also comprises a device 6 for determining a parameter representative of the quantity of juice in the collector 4. This device 6 for determining a parameter representative of the quantity of juice in the collector 4 generally comprises at least one level sensor 61 and / or a pressure sensor 62 arranged at the collector 4.

[0028] In the example of [Fig.l], a pressure sensor 62 is provided positioned at the bottom of the collector 4 to measure the height of juice in the collector 4. It a high level sensor and a low level sensor are also provided, said sensors both being shown at 61 in the figures. The presence of such a device 6 for determining a parameter representative of the quantity of juice in the collector 4 makes it possible to precisely determine the volume of juice in the collector 4. This data is important to then allow adaptation of the treatment according to the volume of juice in the collector 4. The data obtained using the device 6 for determining a parameter representative of the quantity of juice in the collector are transmitted to the control unit 9.

[0029] The control unit 9 is in the form of an electronic and computer system which comprises, for example, a microprocessor and a working memory. According to a particular aspect, the control unit may be in the form of a programmable automaton.

[0030] In other words, the functions and steps described can be implemented in the form of a computer program or via hardware components (e.g. programmable gate arrays). In particular, the functions and steps operated by the control unit or its modules can be performed by instruction sets or computer modules implemented in a processor or controller or be performed by dedicated electronic components or components of the programmable logic circuit type (or FPGA which is the acronym for field-programmable gate array, which literally corresponds to in-situ programmable gate array) or of the application-specific integrated circuit type (or ASIC which is the acronym for application-specific integrated circuit, which literally corresponds to application-specific integrated circuit). It is also possible to combine computer parts and electronic parts.

[0031] When it is specified that the unit or means or modules of said unit are configured to carry out a given operation, this means that the unit comprises computer instructions and the corresponding execution means which make it possible to carry out said operation and / or that the unit comprises corresponding electronic components.

[0032] The installation 1 also comprises a system 7 for stirring the contents of the collector 4.

[0033] In the example shown, the stirring system 7 is a rotating mechanical system with a propeller. The propeller could have been replaced by blades. The propeller or blades are carried by a shaft driven in rotation by a motor. The movement of the blades or the propeller ensures mixing of the contents of the collector 4.

[0034] Alternatively or additionally, a system for blowing or insufflating air into the collector 4 may be provided as a stirring system 7.

[0035] The installation 1 also comprises a system 8 for supplying the collector 4 with bonding agent. It should be noted that the bonding agents can be chosen from the group formed by mineral fining agents, such as bentonite, silica gel, granular fining agents, such as polyvinylpolypyrrolidone (PVPP), protein fining agents, particularly of plant or animal origin, such as egg albumin, casein, gelatin, pea proteins, potato proteins, such as patatin.

[0036] In the example shown, the sizing agent is a mixture of pea protein, polyvinylpolypyrrolidone (PVPP) and sodium and calcium bentonite.

[0037] It is used at a variable concentration depending on the nature of the juices collected. Generally, this concentration is between 0.4 and 1 g per kilo of juice collected.

[0038] In the example of [Fig.l], the system 8 for supplying sizing agents to the collector 4 comprises a reservoir 81 for storing sizing agents and a device 82 for transferring the contents of the storage reservoir 81 to the collector 4.

[0039] The transfer device 82 is in the form of a metering pump whose operation is controlled by the unit 9 for controlling the installation as a function at least of the data provided by the device 6 for determining a parameter representative of the quantity of juice in the collector 4.

[0040] Finally, to perfect the installation 1, the latter can comprise a system 10 for determining the nature of the juices collected to distinguish the juices coming from the area of ​​the pulp of the grape berries, from the juices coming from the area of ​​the skin of the grape berries.

[0041] The system 10 for determining the nature of the collected juices comprises at least one pH measuring device 101 equipping the collector 4 and / or a pressure measuring device 103 equipping the press 2 and / or a device 102 for measuring the volume of juice extracted from the press and / or a pressing time counter 104. Determining the nature of the juices as a function of the pH is known as illustrated in patent EP-2,433,508.

[0042] In the example shown in [Fig.l], the system 10 for determining the nature of the juices collected from the installation 1 comprises a pH measuring device 101, such as a pH measuring probe, equipping the collector 4 and a conductivity measuring sensor 105 also equipping the collector 4.

[0043] The control unit 9 is configured to acquire data, in particular from the sensors described above, to determine a set pH value, store this set pH value and measure the pH in real time and continuously at the collector 4 until the stored set pH value is obtained. This set pH value is considered to correspond to a change in the nature of the juices at the level of the collected juices. By change in the nature of the juices, we mean the passage from juices from the pulp zone to juices from the skin zone.

[0044] To enable the determination of a set pH value, the control unit 9 is configured to record a pair of pH / conductivity values, i.e. a pair of values ​​comprising a pH value and a conductivity value, and to determine the set pH value to be stored, based on the pair of pH / conductivity values ​​measured.

[0045] The recording of the pH / conductivity value pair takes place at a time depending on the progress of the pressing. This time can be determined by the operator who can visually determine that the draining phase is finished and that the pressing can begin. The operator can then manually decide to start the pressing operation and decide the time, during this pressing, at which the installation 1 must record the pH / conductivity value pair. In this case, the operator manually controls the recording of a pH / conductivity value pair.

[0046] Alternatively, the triggering of this recording of a pair of pH / conductivity values ​​can be carried out automatically. For this purpose, the installation 1 can comprise a system for determining the progress of pressing and the control unit 9 is configured to measure the pH and the conductivity of the juices collected downstream of the pressing chamber 3 in the collector 4 and to record a pair of pH / conductivity values ​​as a function of the progress of said pressing.

[0047] The control of this recording can for example be carried out on the basis of a measurement of the flow rate of the collected juices. For this purpose, the installation 1 can comprise a device for measuring the volume of juice extracted from the press in the form of a flow meter shown at 102 in [Fig.l]. This flow meter is here arranged at the outlet of the collector 4 but could have been arranged in an equivalent manner at the inlet of the collector 4 or at the outlet of the pressing chamber 3.

[0048] Generally, the pressing comprises a succession of pressure stages with each stage corresponding to the application of pressure for a period of time. The stages are stored. The installation 1 may therefore comprise a memory in which these pressure stages are stored, i.e. the pressure and time values. The pressure generally corresponds to the pressure in the control chamber 12.

[0049] The system for determining the pressing progress may comprise, for its part, at least one member for direct or indirect measurement of the state of the deformation of the pressing chamber 3.

[0050] In the case of a press as described above, this member for direct or indirect measurement of the state of the deformation of the pressing chamber of the system for determining the progress of the pressing, is a pressure measuring member preferably arranged inside the control chamber 12.

[0051] The measurement of the state of the deformation of the pressing chamber 3 is therefore, in this case, an indirect measurement.

[0052] The installation 1 can in fact thus comprise a pressure measuring device 103 in the form of a simple pressure sensor positionable inside the control chamber 12 of the press. The control unit 9 is configured to compare the measured pressure with a stored pressing pressure and when the stored pressing pressure is reached, the pH and conductivity values ​​measured at that instant are stored to form the pH / conductivity value pair.

[0053] It should be remembered that during pressing, after the application of one or more pressure levels, the control chamber is placed under vacuum, then possibly re-dug, i.e. the press tank is rotated before applying one or more pressure levels again.

[0054] The instant of recording of the pH / conductivity value pair corresponds, in the case of a crushed destemmed harvest, to the first pressurization of the control chamber, that is to say to the first pressure level. In the case of a whole harvest, this instant corresponds to the end of the first pressing cycle, a cycle being a succession of pressure levels before a re-digging. We can have a following cycle 5 min at 5,000 Pa 5 min at 10,000 Pa 5 min at 15,000 Pa then vacuum drawing and digging again.

[0055] The or one of the memories of the installation 1 is a memory for storing reference pH and conductivity data, for example in the form of an abacus. Thus, this memory comprises, for a value or a range of conductivity values ​​expressed for example in MilliSiemens per centimeter (mS / cm), and a pH value or a range of pH values, a value of A of increase in pH.

[0056] Thus, for example, the memory may comprise the following data:

[0057] [Tables 1] Conductivity (mS / cm) PH A pH increase <3.00 <3.5 + 0.1 >3.01 >3.51 + 0.05

[0058] The control unit 9 is configured to compare the reference pH and conductivity data with the measured pH / conductivity value pair and to determine an increase in pH as a function of the comparison.

[0059] The set pH value to be stored is equal to the pH value of the measured pH / conductivity value pair, plus the pH increase value resulting from the comparison of the reference pH and conductivity data with the measured pH / conductivity value pair.

[0060] Thus, for example, it is assumed that the pH / conductivity value pair measured at the time when these values ​​must be stored is equal to 3.2 for the pH and 2.90 for the conductivity. Since the measured conductivity is < 3, and the pH is < 3, then the delta value (A) of increase in the pH is equal to 0.1, so that the setpoint pH value is equal to the measured pH value plus the delta of increase in pH, i.e. 3.2+0.1=3.3. This setpoint pH value equal to 2.1 is therefore stored, and the control unit 9 acquires, from this storage, in real time and continuously, the pH value measured by the pH measuring device 101, at least until the setpoint pH value is obtained.

[0061] When the set pH value is reached, several complementary or cumulative scenarios can be envisaged. Thus, the installation 1 can comprise a device for emitting an audible and / or luminous alert signal, such as an alarm or a visual indicator term, arranged near or at the collector 4.

[0062] The control unit 9 is configured to control the emission of an audible and / or luminous alert signal by the device for emitting an audible and / or luminous alert signal, when the set pH value is reached.

[0063] The operator can thus, when this signal is emitted, decide to stop the collection of juices or to modify the collection conditions. These operations can also be carried out automatically. Thus, the control unit 9 can be configured to isolate the collector 4 by controlling the closing of the shutter member 15 of the inlet 51 of the collector 4 and / or the closing of the shutter member of the juice outlet of the pressing chamber and / or the rotation of the press tank and / or a reduction in the pressure of the pressing chamber 3 of the press when the set pH value is reached. The closing of the shutter member can be carried out with or without the emission of an audible and / or luminous alert signal.

[0064] Once this set pH value is reached, it may also be decided to interrupt the collection, to empty the collector 4 before collecting new juices now corresponding to the juices from the skin area of ​​the grape berries. Once the collector is filled with such juices, it may be decided to add fining agents to the collector 4 in a quantity depending on the quantity of juice in the collector 4.

[0065] The control unit 9 can thus be configured to control the transfer device 82 for automatic supply of the collector 4 from the storage tank 81 of bonding agents.

[0066] Thanks to the characteristics of the installation 1, as described above, it results in a possibility of determining reliably and quickly the nature of the collected juices. to precisely determine the moment during harvesting when the juices should no longer be considered as juices from the pulp area, but as juices from the skin area of ​​the grape berries.

[0067] This operation of treating the juices at the collector 4 can be repeated after a new emptying of the collector 4 if necessary depending on the quantity of juice extracted from the pressing chamber 3. It should be noted that the emptying of the collector 4 can be forced at each digging.

[0068] Alternatively, the change in the nature of the juices can be determined as a function of the volume of juice collected, this volume being measured at the collector 4 via the device for measuring the volume of juice extracted from the press, shown at 102 in [Fig.l]. Thus, when the volume is greater than a predetermined value, it is considered that the extracted juices are now juices from the skin area.

[0069] As a further variant, the change in the nature of the juices can be determined solely as a function of the pressing pressure when, for example, the pressure in the control chamber is greater than a predetermined value.

[0070] As a further variant, the change in the nature of the juices can be determined solely as a function of the time elapsed since the start of pressing, this time being measured using a pressing time counter 104. It is thus considered that, when the pressing time is greater than a predetermined value, the juices extracted are juices from the skin area.

[0071] In practice, the treatment method is as follows. It is assumed that the juices, arriving in the collector 4 and coming directly from the pressing chamber 3 of the press 2, must be treated due, for example, to their nature which could have been determined according to one of the means described above. The outlet of the collector 4 is closed. The juices coming from the pressing chamber 3 accumulate in the collector 4. When a predetermined quantity of juice is reached in the collector 4, the supply of juice to the collector 4 from the pressure chamber 3 is interrupted by closing the juice outlet of the pressing chamber 3, and / or by closing the inlet of the collector 4, and / or rotating the press tank after evacuating the control chamber of the press and / or reducing the pressure inside the pressing chamber.Fining agents are then introduced into the collector 4 via the transfer device 82 in an amount depending on the volume of juice in the collector 4.

[0072] In parallel, the contents of the collector 4 are stirred using the stirring system 7. After a predetermined period of time, the collector 4 is emptied into the juice storage tank 13. A new batch of juice from the skin area can be introduced from the pressing chamber into the collector 4 before being treated as mentioned above. The operation can be repeated as many times as necessary. necessary.

[0073] At the end of the pressing, all the juices are in the juice storage tank 13 and the juices to be treated have been treated at the collector 4. It is now sufficient to allow the contents of the juice storage tank 13 to settle to allow clarification of the grape juices by removing the lees. All these operations, as described above, can be carried out in line without having to transfer the juices as was the case in the prior art, while still having juice whose treatment is optimized.

Claims

Claims

1. Method for treating grape juice in a collector (4) arranged downstream of a press (2) equipped with a pressing chamber (3), said collector (4) having an inlet (51) in direct fluid communication with the pressing chamber (3) of said press (2), characterized in that said method comprises a step of determining a parameter representative of the quantity of juice in the collector (2), a step of supplying said collector (4) with fining agents as a function of the determination of the quantity of juice in the collector (4), and a step of stirring the contents of said collector (4).

2. Method for treating grape juice according to claim 1, characterized in that it comprises, before the step of supplying said collector (4) with fining agents, a step of determining the nature of the juices collected to distinguish the juices from the pulp area of ​​the grape berries from the juices from the skin area of ​​the grape berries.

3. A method of treating grape juice according to claim 2, characterized in that the step of supplying the collector (4) with fining agents is carried out in the collector (4) on the juices from the skin area of ​​the grape berries.

4. A method of treating grape juice according to one of claims 1 to 3, characterized in that the contents of the collector (4) being intended to be evacuated to a juice storage tank (13), the collector (4) is, after a predetermined period of time, emptied into said juice storage tank (13) so that at the end of pressing, all the juices are in the juice storage tank (13) and the juices to be treated have been treated at the collector (4).

5. Installation (1) for processing grape juice, said installation (1) comprising a press (2) comprising a pressing chamber (3) and a collector (4) arranged downstream of the press (2), said collector (4) comprising an inlet (51) in direct fluid communication with the pressing chamber (3) of the press (2), characterized in that the installation (1) comprises a device (6) for determining a parameter representative of the quantity of juice in said collector (4), a system (7) for stirring the contents of the collector (4), a system (8) for supplying fining agents to said collector (4) and a control unit (9) configured to control the supply system (8) in sizing agents of the collector (4) according to data provided by the device (6) for determining a parameter representative of the quantity of juice in said collector (4).

6. Installation (1) for processing grape juice according to claim 5, characterized in that said installation (1) comprises a system (10) for determining the nature of the juices collected in the collector (4) to distinguish the juices from the pulp area of ​​the grape berries from the juices from the skin area of ​​the grape berries.

7. Installation (1) for processing grape juice according to claim 6, characterized in that the system (10) for determining the nature of the collected juices comprises at least one pH measuring device (101) equipping the collector (4) and / or a pressure measuring device (103) equipping the press (2) and / or a device for measuring the volume (102) of juice extracted from the press and / or a pressing time counter (104).

8. Installation (1) for processing grape juice according to one of claims 5 to 7, characterized in that the device (6) for determining a parameter representative of the quantity of juice in said collector (4) comprises at least one level sensor (61) and / or a pressure sensor (62) arranged at the collector (4).

9. Installation (1) for processing grape juice according to one of claims 5 to 8, characterized in that the stirring system (7) is a rotary mechanical system, preferably with blades or propellers, and / or an air blowing system.

10. Installation (1) for processing grape juice according to one of claims 5 to 9, characterized in that the system (8) for supplying fining agents to said collector (4) comprises at least one tank (81) for storing fining agents and at least one device (82) for transferring the contents of the storage tank (81) to the collector (4) and in that the installation (1) comprises a juice storage tank (13) to which the contents of the collector (4) are intended to be discharged so that at the end of pressing, all the juices are in the juice storage tank (13) and the juices to be treated have been treated at the collector (4).

Images