EP3983739B1 - Procédé de séchage de matériaux en vrac - Google Patents

Procédé de séchage de matériaux en vrac Download PDF

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Publication number
EP3983739B1
EP3983739B1 EP20737332.5A EP20737332A EP3983739B1 EP 3983739 B1 EP3983739 B1 EP 3983739B1 EP 20737332 A EP20737332 A EP 20737332A EP 3983739 B1 EP3983739 B1 EP 3983739B1
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EP
European Patent Office
Prior art keywords
container
drying
containers
residence time
loading
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EP20737332.5A
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German (de)
English (en)
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EP3983739A1 (fr
EP3983739C0 (fr
Inventor
Erhard Fux
Dieter Kremer
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Wittmann Technology GmbH
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Wittmann Technology GmbH
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Publication of EP3983739B1 publication Critical patent/EP3983739B1/fr
Publication of EP3983739C0 publication Critical patent/EP3983739C0/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/14—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials moving through a counter-current of gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00—Drying solid materials or objects by processes involving the application of heat
    • F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
    • F26B2200/08—Granular materials

Definitions

  • the invention relates to a method for drying bulk material, in particular solids, such as granules, powders, grains, films, snippets, or the like, in particular for the plastics processing industry, as described in the preamble of claim 1.
  • plastic granules must be dried before processing in a machine, for example in an injection molding machine.
  • Each drying hopper has a fill level sensor which is assigned to a material separator of each drying hopper.
  • Each loading batch receives a time stamp when loading and physically moves through the drying hopper according to the first-in, first-out principle.
  • data is moved forward in a list [20(x)].
  • the size M of the storage for the bulk material results from the relationship between the volume of the drying container and the volume of the material separator. This is directly related to the number of conveying processes required to completely fill the drying hopper.
  • the so-called “dwell time” results from the oldest entry in the list 20(x). So the residence time of the oldest batch is the current time minus the timestamp in this oldest batch.
  • the disadvantage here is that in this calculation, the execution of a loading batch is not directly linked to the removal of material.
  • Drying systems for generating a dried or heated gaseous medium stream, in particular air, for plastics processing machines are already known, with one or more drying containers being connected to the drying system and a dried, gaseous medium flowing through the drying container or containers, in particular, for drying the plastic material Air is provided.
  • One or more process heaters or air heaters are connected upstream of the drying container(s).
  • the return air emerging from the respective drying container is fed back to the drying system via an individual return air line or a collecting line for several drying containers.
  • a method for drying bulk material preferably plastic granules, is known, in which the bulk material is dried in a drying container using an air stream.
  • the exhaust air stream or the return air emerging from the drying container is dried in a drying cell containing a drying agent or adsorbent, if necessary the adsorbent is regenerated and fed to the bulk material as a dry air stream.
  • the exhaust air emerging from the drying container is dried in a dryer containing an adsorbent and fed back to the bulk material as dry air.
  • This device essentially consists of at least one drying cartridge or drying cell, a downstream air heater, a downstream drying container and a downstream cooling device.
  • a drying system can also exist without a drying cartridge, but with other components, i.e. an air heater and a downstream drying container.
  • drying cartridge Other geometries of the drying cartridge are also possible, for example from EP 2 542 846 B1 and EP 2 542 847 B1 visible to the applicant. It describes a segmented wheel dryer with a rotatable drum in which the moist air is removed from the container for the bulk material, dried and fed back into the container.
  • the disadvantage of all known methods is that the required drying performance for the respective drying container can only be determined indirectly and with the help of additional sensors, preferably temperature sensors. Necessary changes in drying performance can only be detected with a delay because temperature sensors naturally have a slow response. Recognizing a trend of a temperature value also requires a longer observation period, which causes an additional delay in the control behavior. Preferably, the behavior of the temperature differential between supply air to and return air from the material container is used to determine the drying performance.
  • Fluctuating drying performance results from different production requirements, such as when additional processing machines are connected to the same drying tank for material supply or when a processing machine experiences a production stoppage.
  • loading a drying container with cold or moisture-saturated plastic material suggests a higher drying performance, although the material throughput through the drying container may be unchanged.
  • Sensitive plastic materials can suffer thermal damage if they are over-dried. Again, if the drying is too slow The moisture contained in the plasticized material stream causes quality problems, e.g. streaks in the plastic part produced.
  • manufacturers of plastic material typically define the residence time and process temperature of the respective material in the dried and/or heated gaseous medium stream to the appropriate temperature.
  • the residual moisture values of the material can be found from the manufacturer's data sheets at a defined initial moisture content that cannot be exceeded. These specifications are of course taken into account when designing a drying system. This determines the size of the respective material containers and the required air output of the drying devices.
  • the material's residence time will be adhered to, since it is not possible to easily determine the actual residence time. If more consumers are connected to a material container than originally planned and designed accordingly, the residence time of the material will subsequently be shortened. Improper operation of a drying system only becomes apparent when parts are produced incorrectly. It would therefore be advantageous to know the actual residence time of the material in the drying container.
  • the object of the invention is to provide a method for drying bulk material, in particular solids, such as granules, powders, grains, films, snippets, or the like, preferably plastic granules, of the type mentioned at the beginning, with which, on the one hand, the previously described disadvantages are avoided and on the other hand, to keep or increase the material quality of the bulk material to be made available.
  • solids such as granules, powders, grains, films, snippets, or the like, preferably plastic granules, of the type mentioned at the beginning
  • the method according to the invention is characterized in that, depending on the material or bulk material used, the drying time specified by the manufacturer or set by the user, in particular residence time (45), is transmitted either from a higher-level control or from the consumer or in the Control of the container or drying device is set by the operator or is present in the control of the container or drying device in the form of a local database, whereby the consumer can determine the material consumption or the shot weight per production cycle or the individual or cumulative shot weights for several production cycles or other values , which indicate material consumption, is transmitted to the drying device(s) and/or material containers directly or indirectly via the higher-level control, whereby each material container is composed of several loading batches with time stamps on the control side and is for the lowest loading batch, in particular material batch, in the material container the drying or dwell time results from the difference between the current time of the respective material removal by the consumer and the time stamp associated with the oldest loading batch, the control or controls of the drying device or devices or the material container or containers containing the respective entries for the loading batches, at least the Keeps a
  • the next entry in the ring buffer is then used for the calculation, whereby a new loading batch for a specific material container results from a conveying cycle of the bulk material conveying device associated with the loading of this material container.
  • the residence time or drying time required for the respective bulk material and specified by the material manufacturer's data sheets can be precisely calculated and thus monitored for each batch of material required by the consumer, preferably one or more plastics processing machines. If the residence time is too long, which results from a standstill of the consumer or consumers or due to the lower material consumption of one or more consumers due to the process, different, already known strategies can be initiated to adapt the drying process.
  • the set process temperatures in or in the containers or the loading of the container or containers with material or bulk goods or the air volume in the drying device or devices can be determined based on the transmission of at least the material consumption be automatically adapted by the consumer to the drying device(s) or material containers. What is new is that a residence time that is too short and therefore possible under-drying of the material can also be detected. This case occurs when consumers retrieve too much material from the drying container(s) and the residence or drying time of the material specified by the material manufacturer can no longer be maintained. If, due to the device and size, it is not possible to increase the amount of dry air or increase the loading of the material containers, a possible error condition exists, which must be indicated to the consumer or user.
  • the current material consumption transmitted by the consumer is deducted from the oldest loading batch in the ring buffer until this loading batch is completely used up, with the next oldest loading batch, i.e. the next entry in the ring buffer, then being used for the calculation.
  • the used loading batch can be assigned to the plastic parts produced for quality records and, on the other hand, the amount of material in a loading batch, in particular the oldest, is known at any time, so that the control can determine whether the next manufacturing cycle will still be carried out with the oldest loading batch or whether additional material will be used from the next loading batch.
  • the control can issue a corresponding message so that either the manufacturing cycle is stopped or the manufactured part is noted or marked in order to subsequently subject it to a quality check.
  • a new loading batch and thus an entry in the ring buffer for a specific material container results from a conveying cycle of the bulk material conveying device associated with the loading of this material container.
  • the advantage here is that the residence time of the bulk material in the drying container is determined from the consumption data reported by the plastics processing machine, for example shot weight per cycle or material consumption per unit and the loading batches of the material container(s) managed on the control side in or in the material containers or in or in the drying devices can be calculated.
  • the calculation of the residence time is based on the first-in-first-out flow principle of bulk material in the drying container, as well as the determined or set, or at least known, size of the container and the bulk material conveyor for loading the container.
  • bulk material conveyors have a much smaller volume than drying containers, for example in a ratio of 1:20 up to 1:60 or even more.
  • a drying container is made up of several loading batches, which are provided with a time stamp and kept in a ring buffer.
  • the size of the ring buffer i.e. the number of line entries, corresponds approximately to the ratio of the size of the drying container to the size of the bulk material conveyor.
  • the “oldest” loading batch in the ring buffer is used to calculate the residence time of the material.
  • discontinuous operation such as that of an injection molding machine, the consumer reports the corresponding material consumption for each injection cycle using different physical variables.
  • the residence time of the lowest batch of material in the material container, which is used for the injection molding cycle results from the difference between the current time at the time the consumer needs it and the time stamp of the oldest batch in the ring buffer.
  • the process temperature is changed to an adjustable or automatically determined value, preferably reduced. This ensures that if the material requirement is too low and the residence time in the container is too long, the temperature for the bulk material or the plastic is reduced, so that the plastic in the container is prevented from drying out. This can often occur if one or more consumers experience an error during the process cycle, are switched off or a production stop occurs. Many over-dried plastics experience thermal degradation, resulting in a defective plastic part, such as loss of strength, embrittlement, discoloration, or cracking. In addition, additives bound in the plastic can be released through overdrying, which can return to the drying device via the return air line and have a negative impact on the drying process by sticking and blocking filters and desiccant.
  • Another strategy is to regulate the amount of air through the silo using a flap, which functions similarly to a proportional valve and is typically placed in the preliminary air flow. Although this does not reduce the residence time of the material in the drying container, it does adjust the amount of air that flows past the material in question and thus limits the material's ability to absorb moisture. The excess air is returned to the drying device via a bypass valve. Since this air is not laden with moisture, there is no energy required for dehumidification in the drying device.
  • the air volume can be directly influenced, thus reduced or increased, and thus have a similar effect to the flap.
  • Another method directly influences the amount of bulk material in the container's storage.
  • the volume in the storage is increased, whereas if the required bulk material is reduced, the volume in the storage is reduced in order to prevent the bulk material from remaining in the storage for too long, i.e. that the loading volume of the Container is constantly adjusted to the required quantity, whereas in the prior art care is taken to ensure that there is always sufficient bulk material and that the loading volume is kept constant.
  • a significant advantage also arises from the fact that a residence time of the material that is too short can be detected and a corresponding error message is displayed to the operator after an adjustable or fixed time has elapsed.
  • both the consumer, preferably one or more injection molding machines, as well as the drying device or devices and material containers function independently of one another and are connected to one another via communication interfaces are advantageous. This makes it possible for the drying devices and material containers to be brought to the respective processing machine, ensuring an optimal supply of bulk material for all work cells in the industrial plant.
  • drying device or devices and material containers calculate the residence time of the material or bulk material present in the container or containers from the transmitted material throughputs or shot weights per production cycle or cycles. This ensures that the devices that process bulk materials, in particular the injection molding machines, have one optimal bulk material quality is provided for further processing.
  • the measures are advantageous in which both the consumer, preferably one or more injection molding machines, as well as the drying device or devices and material containers function independently of one another and are connected to one another via communication interfaces. This means that a calculation of the residence time or other states can be determined or calculated at any time, regardless of the consumer's production cycle.
  • the measures are advantageous in which the control or controls of the drying device or devices or the material container or containers hold the respective entries for the loading batches, at least the time stamps, in the form of a ring buffer. This ensures that the control can carry out a comparison with the dwell times specified by the manufacturer at any time and react in order to maintain the specified dwell times for the best possible quality of the plastic part to be produced.
  • the measures are advantageous in which the volume of the bulk material conveyor assigned to a material container results in the physical size of a loading batch, from which the material consumption reported by the consumer is deducted.
  • the measures are also advantageous in which the drying device or devices can select different strategies for drying the material in the container or containers by predetermined selection or automatically if the specified or determined residence time of the material or bulk material is exceeded or exceeded. This ensures that the specified residence time of the granulate used is not exceeded, thus ensuring the best possible quality of the injection molded part produced.
  • the measures in which the process temperature is changed, preferably reduced, to an adjustable or automatically determined value while the residence time specified or determined for the respective plastic or bulk material in the container or containers is exceeded are advantageous. This prevents the bulk material in the material container from becoming too dry.
  • the drying device or devices which are equipped with a frequency converter to change the air volume or quantity of air, control the air volume through the air volume during the period when the residence time specified or determined for the respective material is exceeded or exceeded or change the containers automatically.
  • the measures are advantageous in which a material container equipped with a throttle valve to change the amount of air flowing through this container (47) controls the volume of air while the residence time specified or determined for the respective material is exceeded or exceeded the container changes automatically. This results in a simple and effective structure.
  • the measures in which the material template or the amount of bulk material in the material container or containers can be automatically adjusted to the specified residence time are advantageous in order to achieve an optimal and constant residence time in the material container for the respective material.
  • measures are also advantageous in which an error output can occur after an adjustable or fixed period of time if the dwell time specified or determined for the respective material is not reached. This prevents products made with this material from being subsequently checked for quality or from the corresponding material or plastic parts being disposed of.
  • the measures are advantageous in which the size of the container or containers can be adjusted or determined and thus the total amount of material in the container or containers can be determined. This means that different maximum volumes of material to be filled can be defined with the same design of the container, i.e. that a standardized storage in the container is used for a wide variety of designs, but a different size of the container can be defined via the settings.
  • FIG. 1 to 5 an industrial plant 1 for plastic applications is shown, in which the individual production means 2 are connected together to produce one or more products/semi-products or injection molded parts 3.
  • plastic granules or powder it is possible for plastic granules or powder to be fed to the processing machine 4 via a granule conveyor 9 and possibly via a dosing device 11 or from a granule dryer 10 for the production of an injection molded part 3.
  • the injection mold 7 can be kept at operating temperature by supplying a temperature control medium or can be heated or cooled accordingly, so that optimal processing of the plastic granules or powder, which must be plasticized for injection into the injection mold 7, is possible becomes.
  • the system can have a monitoring device 15, in particular a camera system, in order to ensure automatic quality control of the generated data To be able to carry out product 3.
  • a monitoring device 15 in particular a camera system
  • the creation of the process and control logic for the robot 5 or automatic handling machine 5 and any connected automation components 16 or systems is typically carried out using the teach-in process, for which a corresponding teach box 18 or robot control can be used.
  • the individual devices can be set or programmed, they preferably have control electronics or controller 19, as shown schematically, with the setting or programming being entered and displayed via displays arranged on the devices or the teach box 18.
  • the programming or setting can also be carried out via an external component that is connected to the production means 2 via an interface.
  • Such production means 2 are also preferably combined into one or more work cells 20, whereby the communication of the production means 2 within the work cells 20 can take place directly with the machine 4 or via a work cell control 21.
  • the industrial plant can have one or more control rooms 23, in which in particular one or more control units 24 or computers are arranged, which can also be used via cell phones 25 and/or tablet 26. So that the plastic-processing production means 2 are supplied with bulk material 12, the corresponding production means 2 can be supplied via a central conveyor system 27, such as this one, for example Fig. 2 is shown, are supplied via corresponding supply lines 28.
  • FIG. 3 a detail of the structure of a drying system 29 to illustrate the process for drying bulk material 12, in particular solids, such as granules, powders, grains, films, snippets, or the like, preferably plastic granules in a single or several drying devices 30 connected together to form a network Containers 10, 31, in particular material containers 10, 31, are shown.
  • solids such as granules, powders, grains, films, snippets, or the like
  • plastic granules in a single or several drying devices 30 connected together to form a network Containers 10, 31, in particular material containers 10, 31, are shown.
  • the production means 2, in particular the drying device 30 and the container 10, 31, are connected via a line 22 for communication via their controls 19, with the control 19 controlling or regulating the individual components and sensors.
  • all drying devices 30 and containers 10, 31 located in the drying system 29 are connected to one another via an air supply line 32 and air return line 33.
  • the drying devices 30 dehumidify the moist air 34 and then feed dry air 34 into the air supply line 32, so that it is removed from the containers 10, 31 for drying the bulk material 12 and heated accordingly via a process heater 35 and then through the Granules 12 filled storage 36 is conveyed through, so that the air 34 can absorb the moisture of the bulk material 12, whereupon the moist air 34 is fed into the air return line 33.
  • drying devices 30 to remove the moist air 34 from the air return line 33 and convey it via a pump/compressor 37 to a dehumidification unit 38, which removes the moisture in the air 34.
  • the individual devices are equipped with flaps or valves 39, which are controlled accordingly via the control 19.
  • a process temperature 40 set for the respective material 12 or bulk material 12 in or in the containers 10, 31 or the loading 41 of the container or containers 10, 31 with material 12 or bulk material 12 or the amount of air 42 of the or the drying devices 30 are adapted based on the transmission of at least the material consumption 43 from the consumer 2, preferably one or more plastics processing machines, to the drying device(s) 30 or containers 10, 31, that is to say that all consumers or production means that require bulk material 12 or process it Report material consumption 43 so that the drying process of the drying device(s) 30 or containers 10, 31 can be adapted accordingly to the circumstances.
  • the consumers 2 transmit their material consumption or the shot weight per production cycle or the individual or cumulative shot weights for several production cycles to the drying device or devices 30 and material containers 10, 31, which are provided by whose control 19 is further processed, i.e. that the required material consumption 43 is determined or calculated from all transmitted data, so that a corresponding control or regulation is carried out to increase or reduce the required dry bulk material 12.
  • the container 10, 31 and/or the drying device 30 can determine or calculate a residence time 45 of the bulk material 12 present in the storage 36 of the container 10, 31 in order to avoid a storage time 46 that is too short or unnecessarily long for optimal plasticizing and material properties To prevent debris 12.
  • the controls 19 also take into account further parameters, such as the type of material or type of plastic, material size, etc.
  • the optimal residence time is either transmitted from a higher-level control or database or is set by the operator in the control 19 of the container 10, 31 or the drying device 30 or in the control 19 of the container 10, 31 or the drying device 30 is available in the form of a local database.
  • control and regulation methods can be used, where the primary goal is always to provide consistent bulk material quality to the plastics processing equipment.
  • the consumer or consumers 2 transmit the material throughput 43 or the shot weight per production cycle or the individual or cumulative shot weights for several production cycles or other values that directly or indirectly indicate the material throughput the drying device(s) 30 and/or material containers 10, 31 are transmitted. This allows the drying device(s) 30 and/or material containers 10, 31 to calculate the residence time 45 of the material or bulk material 12 present in the container(s) 10, 31 from the transmitted material throughputs or shot weights per production cycle or cycles.
  • FIG. 4 The connection between ring buffer 49 and loading batch 48,48a,48b,48c is shown schematically.
  • the ring buffer 49 is used to store and manage the time stamps 50, in particular the time stamps 50a to c of the various loading batches 48a to c, and possibly further information, for example the size of the loading batch 48a to c, the effective drying time 51a, 51b, 51c of a loading batch 48a to c or additional information 53a, 53b, 53c, of the loading batches 48a to c.
  • a new loading batch 48, on the control side in the ring buffer 49 and physically in the material container 10, 31, results from a material conveying cycle Conveyor device 9, which is mounted on the material container 10, 31.
  • the current time and optionally further information are stored in an entry in the ring buffer 49.
  • the physical loading batches 48a to c are in Figure 4 indicated schematically by different orientations of the bulk material grains and are different layers, as shown schematically separated by dashed lines, in the material container 10, 31. Due to the design, the material moves through a material container 10, 31 according to the FIFO (First-In, First-Out) principle.
  • the “oldest” loading batch 48a in the ring buffer 49 is used to calculate the residence time 45 of the material. In discontinuous operation, such as that of an injection molding machine, the consumer reports the corresponding material consumption using different physical variables for each injection cycle.
  • the residence time 45a of the lowest batch of material 48a in the material container 10, 31, which is used for the injection molding cycle results from the difference between the current time at the time of need by the consumer 2 and the time stamp 50a of the oldest loading batch in the ring buffer 49.
  • the material consumption is preferably transmitted continuously and at presettable time intervals in order to determine the residence time 45.
  • the air supply for the most different loading batches 48, 48a to 48c can be controlled or regulated, that is, that several inflow points 54 for the supply of dried air 34 are arranged on the container 10, 31, in particular on the memory 36, so that The required air 34 is fed in for each calculated residence time 45.45a to c of the various loading batches 48.48a to c.
  • This makes it possible, for example, for the air supply for the oldest, i.e. lowest, loading batch 48a to be reduced and for the next or next loading batches 48b, 48c to be increased.
  • the drying device or devices 30 can use different strategies for drying the material 12 in the container or containers if the specified or determined residence time 45, 45a, 45b, 45c of the material or bulk material 12 is exceeded or exceeded 10, 31 by given Selection or automatic selection.
  • the process temperature 40 can be changed, preferably reduced, to an adjustable or automatically determined value while the residence time 45, 45a, 45b, 45c specified or determined for the respective plastic or bulk material 12 in the container or containers 10, 31 is exceeded becomes.
  • a material container 10, 31 equipped with a throttle valve 46 to change the amount of air 47 flowing through this container 10, 31 to remain active for the duration of a fall below or exceed the residence time specified or determined for the respective material 12 45,45a,45b,45c, the air volume changes automatically through the container.
  • the drying device or devices 30, which are equipped with a frequency converter to change the air volume or air quantity 42, to change the air volume while the air volume falls below or exceeds the residence time 45 specified or determined for the respective material 42 change automatically through the container or containers 10, 31.
  • other drying strategies known from the prior art are possible. It is also possible that if the dwell time 45 specified or determined for the respective material 12 is not reached, an error output can occur after an adjustable or fixed period of time.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Drying Of Solid Materials (AREA)

Claims (11)

  1. Procédé pour le séchage de produits en vrac (12), en particulier de matières solides, telles que des granulés, des poudres, des grains, des feuilles, des rognures ou similaires, de préférence pour des machines de transformation de matières plastiques, dans un seul ou plusieurs appareils de séchage (30) et récipients (10, 31) raccordés de manière à former un ensemble, en particulier des récipients de matière (10, 31), le temps de séchage (45) spécifié par le fabricant ou réglé par le consommateur selon la matière ou les produits en vrac employés (12), en particulier le temps de séjour (45), étant soit transmis par une commande supérieure ou par le consommateur (2), soit réglé par l'opérateur sur la commande (19) du récipient (10, 31) ou de l'appareil de séchage (30), soit présent sur la commande (19) du récipient (10, 31) ou de l'appareil de séchage (30) sous forme d'une base de données locale, le consommateur (2) transmettant la consommation de matière (43) ou le poids injecté par cycle de production ou les poids injectés individuels ou cumulés pour plusieurs cycles de production ou d'autres valeurs, qui permettent de déduire la consommation de matière (43), à l'appareil ou aux appareils de séchage (30) et/ou au récipient de matière (10, 31) directement ou indirectement par le biais de la commande supérieure, chaque récipient de matière (10, 31) se composant, côté commande, de plusieurs lots de chargement (48, 48a, 48b, 48c) avec horodatages (50a, 50b, 50c) et le temps de séchage ou temps de séjour (45) résultant de la différence entre le temps actuel du prélèvement de matière respectif par le consommateur (2) et l'horodatage (50a) associé au lot de chargement le plus ancien (48) pour le lot de chargement (48, 48a, 48b, 48c) respectivement le plus bas, en particulier le lot de matière, dans le récipient de matière (10, 31), la commande ou les commandes du ou des appareils de séchage (30) ou du ou des récipients de matière (19, 31) conservant les entrées respectives relatives aux lots de chargement (48, 48a, 48b, 48c), au moins les horodatages (50a, 50b, 50c) sous la forme d'une mémoire tampon circulaire (49), la consommation actuelle de matière (43) transmise par le consommateur (2) étant déduite du lot de chargement le plus ancien (48a) dans la mémoire tampon circulaire (49) jusqu'à ce que ce lot de chargement (48a) soit complètement consommé, le lot de chargement suivant le plus ancien (48b), c.-à-d. l'entrée suivante dans la mémoire tampon circulaire (49), étant ensuite employé pour le calcul, un nouveau lot de chargement (48, 48a, 48b, 48c) pour un récipient de matière déterminé (10, 31) étant obtenu par un cycle de transport de l'appareil de transport de produits en vrac (9) associé pour le chargement de ce récipient de matière (10,31).
  2. Procédé selon la revendication 1, caractérisé en ce qu'aussi bien le consommateur (2), de préférence une ou plusieurs machines de moulage par injection (4), que le ou les appareils de séchage (30) et les récipients de matière (10, 31) fonctionnent de manière autonome les uns par rapport aux autres et sont reliés entre eux par des interfaces de communication.
  3. Procédé selon les revendications précédentes, caractérisé en ce que le nombre minimal de lots de chargement (48, 48a, 48b, 48c) d'une mémoire tampon circulaire (49) résulte du rapport entre le volume du récipient de matière (10, 31) et le volume de l'appareil de transport de produits en vrac (9) associé.
  4. Procédé selon les revendications précédentes, caractérisé en ce que la taille physique d'un lot de chargement (48, 48a, 48b, 48c) est obtenue à partir du volume de l'appareil de transport de produits en vrac (9) associé à un récipient de matière (10, 31), dont la consommation de matière (43) transmise par le consommateur (2) est respectivement déduite.
  5. Procédé selon les revendications précédentes, caractérisé en ce que le ou les appareils de séchage (30) peuvent, en cas de dépassement vers le bas ou vers le haut du temps de séjour (45, 45a, 45b, 45c) prédéfini ou déterminé de la matière ou du produit en vrac (12), sélectionner différentes stratégies pour le séchage de la matière (12) dans le ou les récipients (10, 31) par sélection prédéfinie ou de manière automatique.
  6. Procédé selon les revendications précédentes, caractérisé en ce que la température de processus (40) est modifiée, de préférence diminuée, pendant la durée d'un dépassement du temps de séjour (45, 45a, 45b, 45c) prédéfini ou déterminé pour la matière plastique ou le produit en vrac (12) respectifs dans le ou les récipients (10, 31) à une valeur réglable ou définie automatiquement.
  7. Procédé selon les revendications précédentes, caractérisé en ce que le ou les appareils de séchage (30), qui est ou sont équipés d'un convertisseur de fréquence en vue de la modification du volume d'air ou du débit d'air (42), modifient automatiquement le volume d'air (42) circulant à travers le ou les récipients (10, 31) pendant la durée d'un dépassement vers le bas ou vers le haut du temps de séjour (45, 45a, 45b, 45c) prédéfini ou déterminé pour la matière respective.
  8. Procédé selon les revendications précédentes, caractérisé en ce qu'un récipient de matière (10, 31) équipé d'un clapet d'étranglement (46) conçu en vue de la modification du débit d'air (47) circulant à travers ce récipient (10, 31), modifie automatiquement le volume d'air traversant le récipient pendant la durée d'un dépassement vers le bas ou vers le haut du temps de séjour (45, 45a, 45b, 45c) prédéfini ou déterminé pour la matière (12) respective.
  9. Procédé selon les revendications précédentes, caractérisé en ce que la réserve de matière ou la quantité de produit en vrac (12) dans le ou les récipients de matière (10, 31) peut être adaptée automatiquement au temps de séjour (45, 45a, 45b, 45c) prédéfini afin d'atteindre ainsi un temps de séjour (45, 45a, 45b, 45c) optimal et constant pour la matière (12) respective dans le récipient de matière (31).
  10. Procédé selon les revendications précédentes, caractérisé en ce que, en cas de dépassement vers le bas du temps de séjour (45, 45a, 45b, 45c) prédéfini ou déterminé pour la matière respective (12), une erreur peut être affichée après une durée réglable ou prédéfinie de manière fixe.
  11. Procédé selon les revendications précédentes, caractérisé en ce que la taille du ou des récipients (10, 31) est réglable ou peut être déterminée, ce qui permet de déterminer la réserve totale de matière (12) disponible dans le ou les récipients (10, 31).
EP20737332.5A 2019-06-12 2020-06-08 Procédé de séchage de matériaux en vrac Active EP3983739B1 (fr)

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AT505242019 2019-06-12
PCT/AT2020/060233 WO2020247992A1 (fr) 2019-06-12 2020-06-08 Procédé de séchage des produits en vrac, en particulier des solides, tels que des granulés, des poudres, des céréales, des feuilles, des morceaux ou analogues, de préférence des granulés en matière plastique

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Publication number Priority date Publication date Assignee Title
DE3625013C2 (de) 1986-07-24 1995-05-24 Somos Gmbh Verfahren und Vorrichtung zum Trocknen von Schüttgut vorzugsweise aus Kunststoffgranulat
DE4437494A1 (de) 1994-10-20 1996-04-25 Graeff Roderich Wilhelm Verfahren und Vorrichtung zum Trocknen feuchten Gases
DE19757537A1 (de) 1997-12-23 1999-07-08 Wittmann Kunststoffgeraete Gmb Verfahren und Vorrichtung zum Trocknen und Erhitzen von Luft zum Trocknen von Feststoffen
US7343700B2 (en) * 2005-01-28 2008-03-18 Mann & Hummel Protec Gmbh Automatic control of the drying of particulate material
AT505391B1 (de) 2007-10-02 2009-01-15 Wittmann Kunststoffgeraete Gmb Verfahren und einrichtung zum trocknen von schüttgut
AT508754B1 (de) 2010-03-03 2011-04-15 Wittmann Kunststoffgeraete Einrichtung zum trocknen von schüttgut
AT509475B1 (de) 2010-03-03 2012-01-15 Wittmann Kunststoffgeraete Verfahren zum trocknen von schüttgut
JP2012063072A (ja) * 2010-09-16 2012-03-29 Matsui Mfg Co 粉粒体材料の乾燥装置、及び粉粒体材料の乾燥方法
US8959794B2 (en) * 2011-10-18 2015-02-24 Roderich W. Graeff Process and apparatus to control the airflow in dehumidifying dryers
DE102014118742A1 (de) * 2014-12-16 2016-06-16 Phoenix Contact Gmbh & Co. Kg Verfahren und Trocknungsanlage zum Trocknen von Kunststoffgranulat
EP3258197B1 (fr) * 2016-06-15 2020-04-15 Gerresheimer Regensburg GmbH Système de deshumidification de marchandises en vrac sous forme de granules et procédé associé
EP3258198A1 (fr) * 2016-06-15 2017-12-20 Gerresheimer Regensburg GmbH Commande et produit programme d'ordinateur pour une installation de deshumidification de marchandises en vrac

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WO2020247992A1 (fr) 2020-12-17
US20220341662A1 (en) 2022-10-27
EP3983739C0 (fr) 2023-12-27

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