Liquid dosing system associated with mass control of the dosed quantity and related dosing process.

Abstract

LIQUID DOSING SYSTEM ASSOCIATED WITH MASS CONTROL OF DOSED QUANTITY AND RELATED DOSING PROCESS. This is a dosing system (10) that performs mass control of a dosed quantity of liquid product introduced into a chamber of an internal mixer.The dosing system includes at least one reservoir (12) that stores a liquid product; at least one product conduit (16) that transports a dosed quantity of liquid product from the reservoir (12) to the internal mixer; dosing means that directly measure the mass and density of a liquid product dosed from the reservoir (12) and transported to the internal mixer, including at least one pump (18) disposed downstream of the tank and a mass flow meter (20) disposed downstream of the pump (18); a mixing injector (32) disposed downstream of the dosing means; and a pressure sensor (24) disposed downstream of the dosing means to detect the pressure of a dosing circuit that includes the product conduit, the reservoir, the dosing means and the mixing injector.

Description

1 / 14 “LIQUID DOSING SYSTEM ASSOCIATED WITH MASS CONTROL OF THE DOSED QUANTITY AND RELATED DOSING PROCESS” FIELD OF THE ART

[0001] The invention relates to a dosing system that allows mass control of a quantity of dosed liquid products introduced into a rubber mixture. BACKGROUND

[0002] In the field of rubber compounding manufacturing, Banbury-type batch internal mixers (and their equivalents) are well known for making rubber compounds. During a mixing cycle performed by the internal mixer, various raw materials can be used to feed the mixer. The raw materials include the materials needed to make a product obtained from a mixing cycle, including, without limitation, an elastomeric material (e.g., natural rubber, synthetic elastomer, and combinations and equivalents thereof) and one or more ingredients, such as one or more processing agents, protective agents, reinforcing fillers, and / or crosslinking or vulcanizing agents. All ingredients are introduced in varying quantities depending on the desired performance of the products obtained from the mixing cycles (e.g., tires).

[0003] Depending on the rubber mixture formulas, liquid products are required to obtain the desired mixture. Raw materials may therefore also include one or more liquid products which include, but are not limited to, silane, antioxidants (e.g., 6PPD), wax, and stearic acid. A specific quantity of these liquid products is injected into the mixture during processing. In order to perform these dosings, syringe-type systems exist within the context of an automated product dosing system (or liquid dosing system or LDS). Examples of such systems are offered, for example, by Zeppelin Systems (https: / / www.zeppelin-systems.com / videos.html), B&K Wage & Anlagentechnik (http: / / www.bkanlagentechnik.de / www / EN / Produktbereiche / Fluessigkeitssysteme / zylinderPetição 870220054063, dated 21 / 06 / 2022, pág. 15 / 33 2 / 14 dosiersysteme.html) and APEC (https: / / www.apecusa.com / products / liquid-dosingsystem). Other examples are disclosed, for example, of the type described in the Applicant's application FR1911828. Other known dosing solutions consist of a pump associated with a measuring means, such as a Coriolis mass flow meter (see, for example, the system disclosed by publication CN202974399).

[0004] In order to ensure that the constituents of a chosen mixing recipe are introduced into the mixer in precise and regular quantities, it is desirable that the majority of them be reliably introduced into the mixer. For this reason, gravitational incorporation is avoided, especially in cases where a fraction of the constituents may not reach the interior of the mixer. In order to ensure, by controlling the mixing process, that all intended constituents are, in fact, part of the manufactured composition, it is desirable that, immediately after dosing, the constituents remain confined in an enclosure (e.g., a pipe) until they reach the mixer. Volumetric pumping is particularly suitable for the forced introduction of the constituents. Therefore, the disclosed invention doses a precise quantity of liquid products to be injected into a rubber mixture during its manufacture. SUMMARY OF THE INVENTION

[0005] The invention relates to a dosing system that performs mass control of a dosed quantity of liquid product introduced into a chamber of an internal mixer that performs rubber mixing processes, characterized by the dosing system including: - at least one reservoir that stores a liquid product between a minimum and maximum level; - at least one product line of a predetermined diameter that carries a metered quantity of liquid product from the reservoir to the internal mixer; - dosing methods that directly measure the mass and density of a liquid product dosed from the reservoir and transported to the internal mixer, being Petition 870220054063, dated 06 / 21 / 2022, page 16 / 33 3 / 14 of the dosage methods include: - at least one pump located downstream of the tank, with the pump having a variable speed according to the intended liquid dosing product; and - a mass flow meter located downstream of the pump; - a mixing injector arranged downstream of the dosing means to introduce liquid products from a mixed rubber mixture into an internal mixer chamber in which the mixing injector is mounted, with a first switching valve that directs a liquid product measured by the dosing means to the mixing injector; and - a pressure sensor installed downstream of the dosing media to detect the pressure of a dosing circuit that includes the product conduit, reservoir, dosing media, and mixing injector.

[0006] In some embodiments, the dosing system also includes: - at least one product pipeline that transports a liquid product from a liquid product source corresponding to the reservoir, with the product pipeline terminating in an outlet that descends below the minimum level of liquid product stored in the reservoir; and - a non-return valve installed upstream of the dosing media in order to maintain the dosing system under pressure at the end of a dosing cycle performed by the dosing system.

[0007] In certain embodiments, the dosing system also includes: - a sampling injector that is part of the dosing circuit and is arranged downstream of the dosing media in order to collect mass samples of the liquid product being measured; and - a second switching valve that directs the measured liquid product to the sampling injector. In some embodiments, at least one between the mixing injector and the sampling injector includes a multi-channel injector.

[0008] In some embodiments, the mass flow meter includes a Coriolis-type flow meter. Petition 870220054063, dated 06 / 21 / 2022, page 17 / 33 4 / 14

[0009] The invention also relates to a dosing cycle performed by the disclosed dosing system, which includes the following steps: - a step in transporting a liquid product from the reservoir, during which an expected mass of liquid product is transported from the reservoir to the pump; - a step of transporting the liquid product from the pump to the dosing means to directly measure the mass and density of the liquid product dosed into the reservoir; - a step to detect the pressure in the dosing circuit using the pressure sensor; and - a step to transport the measured liquid product from the dosing media to the mixing injector in order to introduce the measured liquid products into the internal mixer.

[0010] In some embodiments of the dosing cycle, the dosing cycle also includes a step of comparing data obtained from the dosing media with target values ​​of mass and density of the measured liquid product.

[0011] In certain embodiments of the dosing cycle, the dosing cycle also includes a step to collect a sample of the liquid product being measured.

[0012] In some dosing cycle modalities, the dosing cycle steps are performed iteratively.

[0013] The invention also relates to a rubber mixing process that includes the dosing cycle disclosed. Other aspects of the invention will become clear after reading the detailed description below. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The nature and various advantages of the invention will become clear after reading the detailed description below, together with the attached drawings, identical parts of which have been given the same reference numerals throughout this document and in which: Figure 1 represents a schematic view of a liquid product dosing system of the invention. DETAILED DESCRIPTION

[0015] With regard now to the figures, in which equal numbers identify Petition 870220054063, dated 06 / 21 / 2022, page 18 / 33 5 / 14 identical elements, Figure 1 represents an embodiment of a dosing system for liquid products (or dosing system or system) 10 of the invention. The dosing system 10 takes the form of a dosing circuit that performs mass control of a dosed quantity of each liquid product introduced into a chamber of an internal mixer that performs rubber mixing processes. The dosing system 10 is adapted to dos liquid products in combination with multi-channel injectors (not shown) capable of being mounted on internal mixers. By “multi-channel injector” is meant an injector that incorporates at least two channels, each dedicated to a corresponding liquid product. It is understood that “multi-channel injector” refers to an injector that is capable of dosing at least two different liquid products into an internal mixer during a mixing cycle.It is understood that “internal mixer (or mixer or MI)” means Banbury-type mixers and their equivalents. It is understood that dispensing all different liquid products at the same time is not mandatory. Any of the available liquid products can be dosed according to the selected rubber mixing recipe. It is also understood that the dosing of liquid products can be carried out in a preferred order or simultaneously depending on the selected rubber mixing recipe.

[0016] The dosing system 10 includes at least one storage tank (or reservoir) 12 that stores a liquid product (such as, without limitation, silane, antioxidants (e.g., 6PPD), wax, and stearic acid). Filling is achieved using a transport conduit (or transport conduits) 14 arranged in fluid communication with a source (or sources) of liquid product (not shown) and a corresponding reservoir (or corresponding reservoirs) 12. As an example, Figure 1 shows an embodiment incorporating a transport conduit 14 that transports a liquid product from a corresponding liquid product source to a designated reservoir 12. Each transport conduit 14 terminates in an outlet 14a that drops below a minimum level Nmin of liquid product stored in the reservoir 12. This limits the generation of air bubbles during Petition 870220054063, dated 06 / 21 / 2022, page 19 / 33 6 / 14 a filling cycle, compared to a system where filling is above the liquid level in the reservoir. The level of liquid product arriving in reservoir 12 is controlled (e.g., by one or more commercially available sensors) to ensure that it is filled between a minimum level Nmin and a maximum level Nmax.

[0017] The dosing system may incorporate optional temperature control means (not shown) that manage the viscosity of the liquid product during its flow and storage in the reservoir 12 and also during its flow through the dosing circuit to the internal mixer. Such temperature control means may be selected from collector pipes, water circulation tracking devices and / or equivalents known to a person skilled in the art.

[0018] Depending on the mixture selected to be mixed in the internal mixer, each liquid product is dosed after exiting its reservoir. The dosed liquid product is transported through at least one product conduit 16 with a predetermined diameter. The product conduit 16 carries a precise quantity of liquid product, along with dosing means that directly measure the mass and density of the liquid product dosed from the reservoir 12 and transported to the internal mixer in idle mode (not shown).

[0019] The dosing means include one or more pumps 18 arranged downstream of the reservoir 12, each pump having a variable speed according to a liquid dosing product supplied for the selected rubber mixing recipe. The speed of the pump 18 is controlled, which allows the injection of the liquid product to be optimized and avoids excessive pressure. At the dosing end of the mixing cycle, it is also possible to reduce the flow rate of the dosed liquid product, making it possible to be more precise with respect to the target value of the dosed liquid product. It is understood that the pump 18 may be selected, without limitation, from one or more positive displacement pumps (e.g., peristaltic pumps, eccentric rotor pumps, diaphragm pumps, piston pumps, gear pumps and their equivalents). Petition 870220054063, dated 06 / 21 / 2022, page 20 / 33 7 / 14

[0020] The dosing means further include a mass flow meter (or flow meter) 20 functionally arranged downstream of the pump 18 to directly measure the mass and density of the dosed liquid product from the reservoir 12 and conveyed to the mixer (in this description, the “measurement” or measurement of the dosed liquid product refers to a measurement of its mass and / or density and the measured liquid product refers to a dosed liquid product whose mass and / or density is measured by the dosing means). The product conduit 16 provides a continuous application of the dosed liquid product from the pump 18 to the flow meter 20. The flow meter 20 is selected from known control means to monitor the flow of liquid product through the product conduit 16. In embodiments of the dosing system 10, the mass flow meter 20 includes a Coriolis-type flow meter positioned downstream of the pump 18.

[0021] In addition, the dosing system 10 includes a check valve 22 which is installed upstream of the flow meter 20 in order to maintain the pressure of the dosing system 10 at the end of a dosing cycle. Thus, the dosed liquid product does not flow back to the reservoir 12 and no product-free zone is created in the dosing circuit. During the next dosing cycle, there is no loss of time and accuracy due to possible dead zones. The non-return valve 22 serves to control the pressure in the dosing circuit and particularly to prevent damage due to excessive pressure. Furthermore, in the case of highly viscous products, this non-return valve 22 is also used to perform a recirculation cycle in the dosing circuit, allowing the ideal temperature of the dosing circuit to be reset after a long period of non-use of the dosing system 10.

[0022] In addition, maintaining the pressure in the dosing circuit also has a second function: checking the dosing circuit for leaks, particularly downstream of the flow meter. Any downstream leakage of the liquid product will result in incorrect dosing of the liquid product, since the leaked product is not injected into the internal mixer. In this case, the flow meter 20 gives a flow rate that does not correspond to the amount of liquid product that Petition 870220054063, dated 06 / 21 / 2022, page 21 / 33 8 / 14 entered the mixer. In any case, the pressure is detected by a pressure sensor 24 installed downstream of the flow meter 20. By monitoring the evolution of the pressure in the dosing circuit between consecutive mixing cycles, it is possible to verify if this pressure decreases, which means that a leak is present.

[0023] The dosing system 10 also includes a safety valve 28. The safety valve 28 is activated automatically when the pressure in the dosing circuit increases to a predetermined pressure, in order to open the safety valve 28 and discharge the liquid product (or associated vapor or gas). When the pressure drops to the pre-set value, the safety valve is closed again.

[0024] The measured liquid product is directed to the internal mixer or to a container which will then allow a liquid product to be checked. In the first case where the measured liquid product is directed to the internal mixer, a first switching valve 30 directs the measured liquid product to a mixing injector 32 in order to introduce liquid products other than mixed rubber mixture into a chamber of an internal mixer to which the mixing injector is attached. The mixing injector 32 may be selected from commercially available devices, including multi-channel injectors (for example, of the type offered by Zeppelin Systems or of the type described in the Applicant's application FR1911828).

[0025] In the second case where the measured liquid product is directed to a container that will then allow the liquid product to be checked, a second switching valve 34 directs the measured liquid product to an injector of a sampling device (e.g., a sampling injector 36) in order to collect mass samples of the measured liquid product. The sampling injector 36 applies mass samples automatically, allowing the quality of the measured liquid product to be checked regularly by weighing it on a calibrated balance and checking for any deviation in its measurement (as performed, for example, by a known sampling unit 38).

[0026] It is understood that one or more control solutions may be installed in the dosing system 10 in order to compensate for any system failure. In order Petition 870220054063, dated 06 / 21 / 2022, page 22 / 33 9 / 14 To ensure optimized performance of the dosing system 10, a pump motor encoder 18 can also be used to ensure that the pump operated properly and achieved a number of revolutions close to the expected number. The dosing system 10 (or a system incorporating the dosing system 10) can be trained to recognize representative values ​​of the liquid product entering the mixer (e.g., mass, density, and viscosity values) and to perform a comparison with target values. The dosing system 10 (or an installation incorporating the dosing system 10) can also be trained to recognize representative values ​​of the mixture exiting the mixer (e.g., temperature and viscosity values) and to perform a comparison with target values. This machine training includes the recognition of a non-equivalence between the compared values. Each training step can include a classification generated by means of self-learning.This classification may include, without limitation, the raw material parameters of the selected mixing recipe, the measured liquid product parameters (including the data assigned to flow meter 20), the duration of the mixing cycles, and the expected values ​​at the end of a current mixing cycle. Also, by analyzing the amount of liquid product currently injected in relation to the target value, the dosing system 10 will perform a self-learning cycle and correct the volumes of liquid products dosed. This correction may be performed systematically (e.g., every two, three, or more mixing cycles), but is not necessarily performed every cycle.

[0027] The dosing system 10 may also include a detection system that includes at least one dosing sensor. The detection system is used to perform the detection and generate one or more signals that indicate the current dosage of the dosed liquid product. The detection system includes the sensors to detect a current dosage from the reservoir 12.

[0028] The dosing system 10 may also include a monitoring system that is configured to receive the detected signals (e.g., signals corresponding to the flow rate of the dosed liquid product) and send one or more proportional control signals. Monitoring may be continuous or intermittent. Petition 870220054063, dated 06 / 21 / 2022, page 23 / 33 10 / 14 so that the control signals make a real-time adjustment of the liquid product dosage.

[0029] The monitoring system may include at least one programmable logic controller (or “PLC”) 40 that communicates with the dosing system 10. The PLC 40 may have programmed data for a plurality of rubber mixtures, each with a unique mixing and dosing cycle configuration. The data may have respective liquid product dosages established, so that the current dosage of a detected liquid product can be compared to the same. Additional data may include, but not be limited to, a predetermined liquid product dosage to be applied to the mixture during a mixing and dosing cycle, a target temperature, and a target viscosity of the rubber mixture after a given time. Using this data, the monitoring system may be configured to receive the detected signals and make a corresponding adjustment. All or part of the monitoring system may be housed in a central control center.All or part of the monitoring system can be controlled remotely via a network.

[0030] Referring again to Figure 1, a detailed description is given of an exemplary dosing cycle of the invention. The dosing cycle is part of a rubber mixing process that includes a step of injecting the liquid products, measured during the dosing cycle, into the internal mixer via the mixing injector 32. During this step, the liquid products are dosed according to the selected rubber mixing recipe. During the dosing cycle, the safety valve 28 remains closed, except to allow a discharge in case of excessive pressure.

[0031] The dosing cycle of the invention includes a step for feeding a liquid product from reservoir 12. During this step, the selected liquid product is stored in reservoir 12 at least at the minimum level Nmin, and a switching valve 26 remains closed. During this step, a precise mass of liquid product is transported in the dosing circuit from reservoir 12 to pump 18 (by “circuit” is meant the product conduit 16, the pump 18, the flow meter). Petition 870220054063, dated 06 / 21 / 2022, page 24 / 33 11 / 14 20, the mixing injector 32 and the sampling injector 36). In all modes of the dosing cycle, the speed of pump 18 can be variable during the dosing cycle depending on the intended liquid product dosage for the current dosing cycle.

[0032] The dosing cycle also includes a step of feeding the liquid product from pump 18 to flow meter 20 in order to directly measure the mass and density of the liquid product dosed from reservoir 12. In embodiments of the dosing system 10, this step includes a step of comparing the data obtained from flow meter 20 with the target values ​​of mass and density of the measured liquid product. If the comparison indicates a discrepancy between the current data and the target values, the speed of pump 18 is adjusted in order to correct the dose of the liquid product from reservoir 12.

[0033] The dosing cycle also includes a step to detect the pressure in the dosing circuit by pressure sensor 24. If the pressure detection indicates a leak (i.e., the pressure reduces during the current dosing cycle), this step includes closing the check valve 22. The check valve 22 remains closed until the pressure detection indicates no leak. If the pressure detection indicates no leak, the cycle continues to the next step.

[0034] The dosing cycle also includes a step to route the measured liquid product from the flow meter 20 to the mixing injector 32 in order to introduce the measured liquid product into the internal idle mixer. During this step, the first switching valve 30 is opened and the second switching valve 34 is closed. The mixing injector 32 applies the measured liquid product until the measured liquid product mass is obtained.

[0035] In dosing cycle embodiments that include liquid product control, this step includes a step to apply the measured liquid product from the flow meter 20 to the sampling injector 36 in order to collect at least one mass sample of the measured liquid product. During this step, the first switching valve 30 is closed and the second switching valve 34 is opened. The sampling injector 36 performs the transfer of a mass of liquid product to the unit of Petition 870220054063, dated 06 / 21 / 2022, page 25 / 33 12 / 14 sampling 38 is sufficient to validate that the mass and / or density of the dosed liquid product corresponds to the requested mass and / or density.

[0036] It is understood that one or more stages of the dosing cycle of the invention can be performed iteratively. It is also understood that one or more reservoirs can be associated in a dosing circuit. It is further understood that one or more dosing systems 10 can be installed in a rubber production facility where rubber mixtures are produced.

[0037] The dosing cycle performed by the dosing system 10, as shown in the following example (which is shown only as an example), can be adjusted according to the unique properties of the rubber mixture recipe incorporating the dosed liquid products. EXAMPLE:

[0038] The setpoint of a dosage of a liquid product selected for a rubber mixing recipe is considered. Several dosing cycles are performed following the setpoint value to get closer to the target value (V to V). V a V = 100 kg Establishment point = 100 kg

[0039] The last three (3) values ​​of the net product are weighted and the settlement point value is modified to address the V to V value in the next dosing cycle. TABLE 1 Dose 1 97 Dose 2 99 Dose 3 97 Average dose 97.6 New establishment point 102.4 All units are in kg.

[0040] One or more mixing processes may be considered as part of Petition 870220054063, dated 06 / 21 / 2022, page 26 / 33 13 / 14 a complete mixing process incorporating the dosing cycle of the invention. The mixer receives the measured liquid product and implements a mixing process of the same. The mixing process can be a continuous process, that is, a process or any part of a process whose steps can be carried out without interruption. Continuous processes eliminate the need for intermediate steps and thus allow a variety of industrial applications (e.g., the production of various rubber mixtures for tire production).

[0041] All or part of the mixing and dosing process can be performed by PLC control and may include pre-programming of management information. For example, a dosing process setting can be associated with the mixture supplied to the internal mixer, including the properties of the liquid products and the properties of the mixture exiting the mixer. This setting can be used to prevent liquid products from being dispensed during one or more dosing cycles.

[0042] For all implementations of the dosing system 10, at least part of an integrated monitoring system may be provided on a portable device, such as a mobile network device (e.g., mobile phone, laptop computer, fixed network portable device (or fixed network portable devices), augmented reality and / or virtual reality devices, fixed network portable garment and / or any combination and / or equivalent).

[0043] In embodiments of the invention, the dosing system 10 and / or a part thereof may receive voice commands or other audio data representing, for example, deviations between predicted doses of liquid products and actual detected doses. A command includes a request for the current state of a mixing cycle (including the current state of the mixing and dosing processes performed during the current cycle). A generated response may be represented audibly, visually, tactilely (e.g., using a haptic interface), virtually, augmented, and / or in combinations and equivalents.

[0044] In certain embodiments of the invention, the dosing system 10 (and / or an installation incorporating the dosing system 10) may incorporate a sensor or Petition 870220054063, dated 06 / 21 / 2022, page 27 / 33 14 / 14 sensors that obtain state data. The state data obtained can be entered into a blockchain associated with the dosing system 10 (and / or an installation incorporating the dosing system 10). A blockchain is understood to be a database containing the history of all exchanges between its users since its creation. This database is secured and distributed among its various users, without intermediaries, allowing each to verify the validity of the chain. A blockchain can be public or private.

[0045] The invention preserves all the advantages of a pump associated with a measuring device. At the same time, the invention adapts to industrial constraints that require dosing systems to be effective in terms of precise flow rate for all types of mixtures. The disclosed invention can also ensure the production of mixtures of increasingly different natures.

[0046] The terms “at least one” or “one or more” are used interchangeably. The ranges that are presented as between a and b include the values ​​a and b.

[0047] Although specific embodiments of the disclosed device have been illustrated and described, it is understood that various alterations, additions, and modifications may be made without departing from the spirit and scope of this disclosure. Therefore, no limitation shall be imposed on the scope of the invention described, except as set forth in the appended claims. Petition 870220054063, dated 06 / 21 / 2022, pp. 28 / 33

Claims

1 / 3 CLAIMS 1. Dosing system (10) that performs mass control of a dosed quantity of liquid product introduced into a chamber of an internal mixer that performs rubber mixing processes, the dosing system comprises: - at least one reservoir (12) that stores a liquid product between a minimum level (Nmin) and a maximum level (Nmax) in which a sensor controls the level of liquid product arriving at the reservoir (12) between the minimum level (Nmin) and the maximum level (Nmax); - at least one product conduit (16) of a predetermined diameter that transports a dosed quantity of liquid product from the reservoir (12) to the internal mixer;- a dosing means that directly measures the mass and density of a liquid product dosed from the reservoir (12) and conveyed to the internal mixer, the dosing means comprising: - at least one pump (18) disposed downstream of the reservoir (12), the pump (18) having a variable speed according to a desired liquid product dosage; and - a mass flow meter (20) disposed downstream of the pump (18); - a mixing injector (32) disposed downstream of the dosing means for introducing liquid products other than a mixed rubber mixture into an internal mixer chamber in which the mixing injector (32) is mounted, with a first switching valve (30) that directs a liquid product measured by the dosing means to the mixing injector (32);- a pressure sensor (24) installed downstream of the dosing medium to detect the pressure of a dosing circuit comprising the product conduit (16), the reservoir (12), the dosing medium and the mixing injector (32), and - a non-return valve (22) installed upstream of the dosing medium in order to maintain the dosing system under pressure at the end of a dosing cycle performed by the dosing system, Petition 870240073585, dated 08 / 28 / 2024, page 14 / 17 2 / 3 the dosing system (10) characterized by: - ​​at least one transport conduit (14) that transports the liquid product from a liquid product source corresponding to the reservoir (12), the transport conduit (14) terminating in an outlet (14a) that descends to below the minimum level (Nmin) of liquid product stored in the reservoir (12).; 2. Dosing system (10), according to claim 1, characterized by further comprising: - a sampling injector (36) which is part of the dosing circuit and which is disposed downstream of the dosing medium to collect mass samples of the measured liquid product; and - a second switching valve (34) which directs the measured liquid product to the sampling injector (36).

3. Dosing system (10), according to claim 2, characterized in that at least one of the mixing injector (32) and the sampling injector (36) comprises a multi-channel injector.

4. Dosing system (10), according to any one of claims 1 to 3, characterized in that the mass flow meter (20) comprises a Coriolis type flow meter.

5. Dosing cycle performed by the dosing system (10), of the type defined in any of claims 1 to 4, characterized by comprising the following steps: - a step of detecting a level of the liquid product arriving at the reservoir (12) to ensure that it is filled between a minimum level (Nmin) and a maximum level (Nmax); - a step of delivering the liquid product from the reservoir (12), during which a desired mass of liquid product is delivered from the reservoir (12) to the pump (18); - a step of transporting the liquid product from the pump (18) to the dosing medium to directly measure the mass and density of the liquid product dosed from the reservoir (12); Petition 870240073585, dated 08 / 28 / 2024, p.15 / 17 3 / 3 - a step to detect the pressure in the dosing circuit by means of the pressure sensor (24), this step includes the step of closing the non-return valve (22) until the pressure sensor indicates no leakage; and - a step to transport the measured liquid product from the dosing medium to the mixing injector (32) in order to introduce the measured liquid products into the internal mixer.

6. Dosing cycle, according to claim 5, characterized by further comprising a step of comparing data obtained from the dosing medium with target values ​​of mass and density of the measured liquid product.

7. Dosing cycle, according to claim 5 or 6, characterized by further comprising a step of sampling the measured liquid product.

8. Dosing cycle, according to any one of claims 5 to 7, characterized in that the steps of the dosing cycle are performed iteratively.

9. Rubber mixing process characterized by comprising the dosing cycle, of the type defined in any one of claims 5 to 8. Petition 870240073585, dated 08 / 28 / 2024, pp. 16 / 17

Images