NL2011989C2 - Device and method for gravimetric dosing of different materials, preferably thermoplastic materials. - Google Patents

Device and method for gravimetric dosing of different materials, preferably thermoplastic materials. Download PDF

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Publication number
NL2011989C2
NL2011989C2 NL2011989A NL2011989A NL2011989C2 NL 2011989 C2 NL2011989 C2 NL 2011989C2 NL 2011989 A NL2011989 A NL 2011989A NL 2011989 A NL2011989 A NL 2011989A NL 2011989 C2 NL2011989 C2 NL 2011989C2
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NL
Netherlands
Prior art keywords
weighing
materials
batch
chamber
mixing chamber
Prior art date
Application number
NL2011989A
Other languages
Dutch (nl)
Inventor
Wouter Maathuis
Herman Dirk Jan Wennemars
Original Assignee
W M Plastics B V
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by W M Plastics B V filed Critical W M Plastics B V
Priority to NL2011989A priority Critical patent/NL2011989C2/en
Application granted granted Critical
Publication of NL2011989C2 publication Critical patent/NL2011989C2/en

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
    • G01G19/22—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them
    • G01G19/24—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus
    • G01G19/30—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for apportioning materials by weighing prior to mixing them using a single weighing apparatus having electrical weight-sensitive devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01G—WEIGHING
    • G01G13/00—Weighing apparatus with automatic feed or discharge for weighing-out batches of material
    • G01G13/24—Weighing mechanism control arrangements for automatic feed or discharge
    • G01G13/248—Continuous control of flow of material

Description

DEVICE AND METHOD FOR GRAVIMETRIC DOSING OF DIFFERENT MATERIALS, PREFERABLY THERMOPLASTIC
MATERIALS
The invention relates to a device for gravimetric dosing of different materials, preferably thermoplastic materials, having a housing, comprising a) one or more storage means for separately storing the materials; b) first supply means for supplying materials from the storage means further to; c) a weighing chamber with weighing means for weighing materials received from the storage means; d) second supply means for supplying a batch of materials from the weighing chamber further to; e) a mixing chamber with mixing means for receiving and mixing the materials; f) third supply means for dosing the mixed materials from the mixing chamber to an outside of the device; and g) control means for - controlling the first supply means for preparing batches with predetermined ratio of the different materials in the weighing chamber based on information from the weighing means; - controlling the second supply means for supplying each prepared batch from the weighing chamber to the mixing chamber and for controlling the mixing means. A device according to the preamble is known in the art and is produced by the applicant. The known device is developed for efficiently and accurately dosing dry and free flowing thermoplastic materials to a variety of devices, such as extruders, in order to ensure a constant, high quality of the end product. The known device also comprises a further storage container or hopper for storing mixed batches received from the mixing chamber and a weighing container or hopper for receiving material from the storage hopper. The weighing hopper determines throughput of material by additional weighing means for determining loss of weight information that is used by the control means for dosing the material continuously form the weight hopper.
The invention has for its purpose to further improve the known device.
Thereto the device according to the invention is characterized in that the mixing chamber is arranged to receive more than one batch and the device comprises output rate measuring means wherein the output rate measuring means are arranged to determine the output rate of the device by determining the loss of weight of material when the second and third supply means are both open, wherein the control means are arranged to use the information from the output rate measuring means for dosing the mixed materials with a continuous output via the outlet.
In the device according to the invention the storage hopper and weight hopper can be dispensed with saving production and maintenance costs. The device has a compact design and occupies less space
In a first preferred embodiment the control means are arranged to fill the mixing chamber with materials from the weighing chamber beyond its maximum volume, such that the level of material reaches inside the weighing chamber; and the output rate measuring means are arranged to determine the loss of weight of material in the weighing chamber. Advantageously the weighing means of the weighing chamber can be used for this purpose. Furthermore the sensor, present in the mixing chamber of the known device for detecting the absence of material before supplying the next batch, can be dispensed with.
According to a practical embodiment the second supply means are arranged to remain open until the complete batch from the weighing chamber is received in the mixing chamber.
According to high speed embodiment the device comprises detection means for detecting if a batch is fully received in the mixing chamber and wherein the control means are arranged to prepare a new batch as soon as the detection means have detected that the previous batch is fully received in the mixing chamber.
According to an elegant embodiment the detection means comprise the weighing means.
According to favourable embodiment the device is arranged for dosing the mixed materials into motorized extruding means and the control means are arranged to use the information from the output rate measuring means to control the motorized extruding means.
The invention further relates to a method for gravimetric dosing of different materials, preferably thermoplastic materials, using a device according to the invention, comprising the following steps: a) filling the storage means with different materials; b) preparing a batch of materials with a predetermined ratio of the different materials by controlling the first supply means using information from the weighing means; c) controlling the second supply means to supply the prepared batch in step b) from the weighing chamber to the mixing chamber after preparation of the batch in the weighing chamber is completed, d) determining the output rate of the device by determining the loss of weight of material when the second and third supply means are both open; and e) using the information from the output rate measuring means for dosing the mixed materials with a continuous output via the outlet.
The present invention will now further be elucidated with reference to the figures, wherein:
Figure 1 shows a schematic, partially cut-away view of a device known in the art coupled to an extruder;
Figure 2 shows a schematic, partially cut-away view of a preferred embodiment of a device according to the invention coupled to an extruder; and
Figure 3 illustrates various steps A,B,C, ..., H of the method according to the invention using the device of figure 2.
Figure 1 shows a schematic overview of a possible known device 1 according to the preamble of the main claim and further devices 2, 3 to accomplish the technical effect of the main claim. The setup is connected to an extruder 4. The device 1 is known in the art as a batch blender. The batch blender 1 comprises a) one or more storage means 1-2 for separately storing the (thermoplastic) materials; b) (situated below the storage means) first supply means 1-3 for supplying materials from the storage means 1-2 further to; c) (situated below the first supply means 1-3) a weighing chamber 1-4 with weighing means 1-5 for weighing materials received from the storage means 1-2; d) (situated below the weighing chamber 1-4) second supply means 1-6 for supplying the batch from the weighing chamber 1-4 further to; e) (situated below the second supply means 1-6) a mixing chamber 1-7 with mixing means 1-8 for receiving and mixing the batch; f) (situated below the mixing chamber 1-7) third supply means 1-9 for dosing the mixed batch from the mixing chamber 1-7 to an outside of the device 1; and g) control means 1-10 for - controlling the first supply means 1-3 for preparing a batch with predetermined ratio of the different materials in the weighing chamber 1-4 based on information from the weighing means 1-5; - controlling the second supply means 1-6 for supplying the prepared batch from the weighing chamber 1-4 to the mixing chamber 1-7, - for controlling the mixing means 1-8; and -controlling the third supply means 1-9 for dosing the mixed materials from the mixing chamber 1-7 to the outside of the device via an outlet 1-1.
The batch blender 1 begins its process by weighing the various materials from the storage means 1-2 in the weigh bin 1-4 first, one after the other. After the weighing is done, the batch blender 1 checks the level in the mixing chamber 1-7 using a level sensor 1-11. As soon as there is enough room in the mixing chamber 1-7, the batch in the weigh chamber 1-4 is released into the mixing chamber 1-7. The mixing means 1-8 will then start to mix the batch. The batch is released by the second supply means 1-9 via the outlet 1-1. The process will then repeat itself.
In order to have the best control for an extrusion process, a so-called extrusion control is necessary. An important parameter in this process is the actual extruder speed (weight/time), so that the extruder motor 4-1 rotation speed can be altered to match the desired extruder speed. In order to supply mixed material from the batch blender 1 to the extruder 4 in a continuous way, the outlet 1-1 of the batch blender is connected to a storage hopper 2, which outlet 2-1 is connected to a loss in weight hopper 3. The storage hopper 2 can contain several batches and can provide a continuous stream of mixed material to the weight hopper 2. The loss in weight hopper 3 can weigh continuously using a load cell 3-1 and is therefore able to notice any changes in throughput. This information is then used to control the extruder motor speed 4-1 and to control valve 5 in order to control the flow rate of material provided by the storage hopper.
Figure 2 shows an overview of a device 10 according to the invention and an extruder 4. The device 10 comprises, a) one or more storage means 10-2 for separately storing the (thermoplastic) materials; b) (situated below the storage means) first supply means 10-3 for supplying materials from the storage means 10-2 further to; c) (situated below the first supply means 10-3) a weighing chamber 10-4 with weighing means 10-5 for weighing materials received from the storage means 10-2; d) (situated below the weighing chamber 10-4) second supply means 10-6 for supplying the batch from the weighing chamber 10-4 further to; e) (situated below the second supply means 10-6) a mixing chamber 10-7 with mixing means 10-8 for receiving and mixing the batch; f) (situated below the mixing chamber 10-7) third supply means 10-9 for dosing the mixed batch from the mixing chamber 10-7 to an outside of the device 10; and g) control means 10-10 for - controlling the first supply means 10-3 for preparing a batch with predetermined ratio of the different materials in the weighing chamber 10-4 based on information from the weighing means 10-5; - controlling the second supply means 10-6 for supplying the prepared batch from the weighing chamber 10-4 to the mixing chamber 10-7, - for controlling the mixing means 10-8;
The third supply means 10-9 form an opening for an outlet 10-10 of the device 10 and are therefore always open. The device 10 is arranged for dosing the mixed materials with a continuous output via the outlet 10-10. The control means 10-10 are arranged to supply a batch from the weighing chamber 10-4 to the mixing chamber 10-7 as soon as the preparation of the batch in the weighing chamber 10-4 is completed. The mixing chamber 10-7 will then be filled beyond its maximum volume, such that the level of material reaches inside the weighing chamber 10-4. The device 10 also comprises output rate measuring means wherein the output rate measuring means are arranged to determine the output rate of the device 10 at the outlet 10-1 by determining the loss of weight of material in the weighing chamber 10-4 when the second 10-6 and third supply means 10-9 are both open after the mixing chamber 10-7 has been filled beyond its maximum volume. The second supply means 10-6 are arranged to remain open until the complete batch from the weighing chamber 10-4 is received in the mixing chamber 10-7. The device 10 also comprises detection means for detecting if a batch is fully received in the mixing chamber 10-7 using the information from the weighing means 10-5. If the weight of the contents in the weighing chamber 10-4 is (nearby) zero, then the detection means detects that the batch if fully received in the mixing chamber 10-7. The controller 10-10 is thereby arranged to prepare a new batch as soon as the detection means have detected that the previous batch is fully received in the mixing chamber 10-7. The outlet 10-1 of the device 10 is connected to the inlet 4-2 of the extruder 4. The control means 10-10 are also arranged to use the information from the output rate measuring means to control the rotational speed of the extruder motor speed 4-1 and further connected devices.
Figure 3 shows the various steps A,B,C, , H of the process of the device 10 according to the invention. The device 10 is the device 10 in Figure 3.The device 10 is normally connected to an extruder, but for clarity reasons the extruder is not shown. Also the storage means 10-2 are not shown.
In step A a batch b-1 of materials is prepared in the weighing chamber 10-4 from materials in the storage means 10-2. After the batch b-1 has been prepared, the batch b-1 is released into the mixing chamber 10-7. The mixing means 10-8 will start to mix the batch b-1. The batch b-1 will now be available for the extruder. As soon as the batch b-1 has been released into the mixing chamber 10-7 (step B), the detection means detect that there is no material in the weighing chamber 10-4, since the weighing means indicate (near) zero gram of material. The device 10 will immediately start the preparation of a new batch b-2 (step C). As soon as batch b-2 is ready, the batch b-2 will be released into the mixing chamber 10-7 (step D). The mixing means 10-8 are thereby stopped. The second supply means 10-6 will remain open as the mixed material from batch b-1 is carried off by the extruder (step E). The volume of material (batch b-1 and a percentage of batch b-2) in the mixing chamber 10-7 will thereby continue to drop until the complete batch b-2 is displaced from the weighing chamber 10-4 to the mixing chamber 10-7. During the displacement of batch-2 from the weighing chamber 10-4 to the mixing chamber 10-7, the output rate measuring means determine the output rate of the device 10 by determining the loss of weight of material in the weighing chamber 10-4. After the complete batch b-2 has been displaced to the mixing chamber 10-7, which is detected by the detection means, the second supply means 10-6 will close and a new batch b-3 is prepared (step F). Meanwhile the mixing means 10-8 will start to mix batch b-1 and b-2. The process will then continue to repeat itself as from step D.
The invention is based on the insight that the function of the storage hopper and the weigh hopper can be performed by the batch blender itself using a smarter control.
The invention is consequently not limited to the described and shown preferred embodiment, but extends to any embodiment falling within the scope of protection as defined in the claims and as seen in the light of the foregoing description and accompanying drawings.

Claims (9)

1. Inrichting voor het gravimetrisch doseren van verschillende materialen, bij voorkeur thermoplastische materialen, met een behuizing, omvattende a) een of meer opslagmiddelen voor het afzonderlijk opslaan van de materialen; b) eerste toevoermiddelen voor het toevoeren van materialen uit de opslagmiddelen verder naar; c) een weegkamer met weegmiddelen voor het wegen van de uit de opslagmiddelen ontvangen materialen; d ) tweede toevoermiddelen voor het toevoeren van een batch van materialen uit de weegkamer verder naar; e) een mengkamer met mengmiddelen voor het ontvangen en mengen van de materialen; f) derde toevoermiddelen voor het doseren van de gemengde materialen uit de mengkamer naar een buitenzijde van de inrichting via een uitlaat, en g) regelmiddelen voor - het regelen van de eerste toevoermiddelen voor het bereiden van batches met een vooraf bepaalde verhouding van de verschillende materialen in de weegkamer gebaseerd op informatie van de weegmiddelen; - het regelen van de tweede toevoermiddelen voor het toevoeren van elke bereide batch van de weegkamer naar de mengkamer en het besturen van de mengmiddelen, met het kenmerk, dat de mengkamer is ingericht om meer dan één batch te ontvangen en de inrichting uitvoersnelheidmeetmiddelen omvat, waarin de uitvoersnelheidmeetmiddelen zijn ingericht om de uitvoersnelheid van de inrichting te bepalen door het bepalen van het gewichtsverlies van het materiaal wanneer de tweede en derde toevoermiddelen beide open zijn, waarin de regelmiddelen zijn ingericht om de informatie van de uitvoersnelheidmeetmiddelen te gebruiken voor het doseren van de gemengde materialen met een continue uitvoer via de uitlaat.An apparatus for gravimetric dosing of different materials, preferably thermoplastic materials, with a housing, comprising a) one or more storage means for separately storing the materials; b) first feed means for feeding materials from the storage means further to; c) a weighing chamber with weighing means for weighing the materials received from the storage means; d) second feed means for feeding a batch of materials from the weighing chamber further to; e) a mixing chamber with mixing means for receiving and mixing the materials; f) third feed means for dosing the mixed materials from the mixing chamber to an outside of the device via an outlet, and g) control means for controlling the first feed means for preparing batches with a predetermined ratio of the different materials in the weighing room based on information from the weighing means; - controlling the second feed means for feeding each prepared batch from the weighing chamber to the mixing chamber and controlling the mixing means, characterized in that the mixing chamber is adapted to receive more than one batch and the device comprises output speed measuring means, wherein the output speed measuring means are adapted to determine the output speed of the device by determining the weight loss of the material when the second and third feed means are both open, wherein the control means are adapted to use the information from the output speed measuring means for dosing the mixed materials with a continuous output through the outlet. 2. Inrichting volgens conclusie 1, met het kenmerk, dat de regelmiddelen zijn ingericht om de mengkamer voorbij zijn maximale volume te vullen met materialen van de weegkamer, zodanig dat het niveau van het materiaal tot in de weegkamer reikt; en de uitvoersnelheidmeetmiddelen zijn ingericht voor het bepalen van het gewichtsverlies van het materiaal in de weegkamer met behulp van de weegmiddelen.Device as claimed in claim 1, characterized in that the control means are adapted to fill the mixing chamber beyond its maximum volume with materials of the weighing chamber, such that the level of the material reaches into the weighing chamber; and the output speed measuring means are adapted to determine the weight loss of the material in the weighing chamber with the aid of the weighing means. 3. Inrichting volgens conclusie 1 of 2, met het kenmerk, dat de tweede toevoermiddelen zijn ingericht om open blijven totdat de gehele batch van de weegkamer is ontvangen in de mengkamer.Device as claimed in claim 1 or 2, characterized in that the second supply means are adapted to remain open until the entire batch has been received from the weighing chamber in the mixing chamber. 4. Inrichting volgens conclusie 3, met het kenmerk, dat de inrichting detectiemiddelen omvat voor het detecteren wanneer een batch volledig is ontvangen in de mengkamer en waarin de regelmiddelen zijn ingericht om een nieuwe batch te bereiden, zodra de detectiemiddelen gedetecteerd hebben dat de vorige batch volledig is opgenomen in de mengkamer.Device as claimed in claim 3, characterized in that the device comprises detection means for detecting when a batch has been fully received in the mixing chamber and wherein the control means are adapted to prepare a new batch as soon as the detection means have detected that the previous batch is completely included in the mixing chamber. 5. Inrichting volgens conclusie 4, met het kenmerk, dat de detectiemiddelen de weegmiddelen omvatten.Device as claimed in claim 4, characterized in that the detection means comprise the weighing means. 6. Inrichting volgens een der voorgaande conclusies, waarin de inrichting is ingericht voor het doseren van de gemengde materialen in gemotoriseerde extrudeermiddelen en de regelmiddelen zijn ingericht om de informatie van de uitvoersnelheidmeetmiddelen te gebruiken om de gemotoriseerde extrudeermiddelen te regelen.Device as claimed in any of the foregoing claims, wherein the device is adapted for dosing the mixed materials in motorized extruder means and the control means are adapted to use the information of the output speed measuring means to control the motorized extruder means. 7. Werkwijze voor het gravimetrisch doseren van verschillende materialen, bij voorkeur thermoplastische materialen, gebruik makend van een inrichting volgens de aanhef van conclusie 1, omvattende de volgende stappen: a) het vullen van de opslagmiddelen met verschillende materialen; b) het bereiden van een batch materialen met een vooraf bepaalde verhouding van de verschillende materialen door regeling van de eerste toevoermiddelen met informatie uit de weegmiddelen; c) het regelen van de tweede toevoermiddelen om de bereide batch in stap b) toe te voeren van de weegkamer naar de mengkamer nadat de bereiding van de batch in de weegkamer is voltooid, d) het bepalen van de uitvoersnelheid van de inrichting door het bepalen van het gewichtsverlies van het materiaal wanneer de tweede en derde toevoermiddelen beide open zijn, en e) het gebruik maken van de informatie van de uitvoersnelheidmeetmiddelen voor het doseren van de gemengde materialen met een continue uitvoer via de uitlaat.A method for gravimetric dosing of different materials, preferably thermoplastic materials, using a device according to the preamble of claim 1, comprising the following steps: a) filling the storage means with different materials; b) preparing a batch of materials with a predetermined ratio of the different materials by controlling the first feed means with information from the weighing means; c) controlling the second feed means to feed the prepared batch in step b) from the weighing chamber to the mixing chamber after the batch preparation in the weighing chamber has been completed; d) determining the output speed of the device by determining of the weight loss of the material when the second and third feed means are both open, and e) using the information from the output speed measuring means to dose the mixed materials with a continuous output through the outlet. 8. Werkwijze volgens conclusie 7, waarbij stap c) verder de stap omvat van het vullen van de mengkamer voorbij zijn maximale volume, zodanig dat het niveau van het materiaal binnen de weegkamer reikt en waarbij stap d) verder de stap omvat van het bepalen van het gewichtsverlies van materiaal in de weegkamer.The method of claim 7, wherein step c) further comprises the step of filling the mixing chamber beyond its maximum volume, such that the level of the material extends within the weighing chamber and wherein step d) further comprises the step of determining the weight loss of material in the weigh room. 9. Werkwijze volgens conclusie 7 of 8, waarbij stap a) wordt voorafgegaan door de volgende stap a-0): stap a-0): het verbinden van de uitvoer aan gemotoriseerde extrudeermiddelen en waarbij stap e) de stappen omvat van het regelen van de gemotoriseerde extrudeermiddelen aan de hand van het gemeten uitvoersnelheid.A method according to claim 7 or 8, wherein step a) is preceded by the following step a-0): step a-0): connecting the output to motorized extruders and wherein step e) comprises the steps of controlling the motorized extruder on the basis of the measured output speed.
NL2011989A 2013-12-19 2013-12-19 Device and method for gravimetric dosing of different materials, preferably thermoplastic materials. NL2011989C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2011989A NL2011989C2 (en) 2013-12-19 2013-12-19 Device and method for gravimetric dosing of different materials, preferably thermoplastic materials.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2011989 2013-12-19
NL2011989A NL2011989C2 (en) 2013-12-19 2013-12-19 Device and method for gravimetric dosing of different materials, preferably thermoplastic materials.

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NL2011989C2 true NL2011989C2 (en) 2015-06-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110220581A (en) * 2019-05-17 2019-09-10 高邮市宇航化工机械厂 A kind of bio-pharmaceuticals high-precision raw material weighing-appliance and method

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19820709A1 (en) * 1997-05-11 1998-11-19 Bolder Automation Gmbh Measurement of mass throughput to e.g. extruder or injection moulding machine
US6111206A (en) * 1997-02-15 2000-08-29 Maguire; Stephen B. Apparatus and method for gravimetric blending with horizontal material feed
WO2003045542A1 (en) * 2001-11-24 2003-06-05 Colormatrix Europe Limited Method and apparatus for dosing and mixing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6111206A (en) * 1997-02-15 2000-08-29 Maguire; Stephen B. Apparatus and method for gravimetric blending with horizontal material feed
DE19820709A1 (en) * 1997-05-11 1998-11-19 Bolder Automation Gmbh Measurement of mass throughput to e.g. extruder or injection moulding machine
WO2003045542A1 (en) * 2001-11-24 2003-06-05 Colormatrix Europe Limited Method and apparatus for dosing and mixing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110220581A (en) * 2019-05-17 2019-09-10 高邮市宇航化工机械厂 A kind of bio-pharmaceuticals high-precision raw material weighing-appliance and method

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