WO2000066993A1 - Appareil et procede de mesure des proprietes de fluides - Google Patents

Appareil et procede de mesure des proprietes de fluides Download PDF

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Publication number
WO2000066993A1
WO2000066993A1 PCT/US2000/011338 US0011338W WO0066993A1 WO 2000066993 A1 WO2000066993 A1 WO 2000066993A1 US 0011338 W US0011338 W US 0011338W WO 0066993 A1 WO0066993 A1 WO 0066993A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
fluid
channel
tube
drive mechanism
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2000/011338
Other languages
English (en)
Inventor
Paul S. Oliver
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dynisco Polymer Test Inc
Original Assignee
Dynisco Polymer Test Inc
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 Dynisco Polymer Test Inc filed Critical Dynisco Polymer Test Inc
Priority to AU44963/00A priority Critical patent/AU4496300A/en
Publication of WO2000066993A1 publication Critical patent/WO2000066993A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/10—Devices for withdrawing samples in the liquid or fluent state
    • G01N1/20—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials
    • G01N1/2035—Devices for withdrawing samples in the liquid or fluent state for flowing or falling materials by deviating part of a fluid stream, e.g. by drawing-off or tapping
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
    • G01N11/02—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material
    • G01N11/04—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture
    • G01N11/08—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by measuring flow of the material through a restricted passage, e.g. tube, aperture by measuring pressure required to produce a known flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/02—Food
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/44—Resins; Plastics; Rubber; Leather
    • G01N33/442—Resins; Plastics

Definitions

  • the present invention relates to methods and apparati for measuring properties of a fluid flowing through a flow channel and, more particularly, to apparati/methods which measure properties such as viscosity, temperature, flow rate, pressure, density and the like of polymer materials being routed in fluid form through a barrel, tube, manifold, nozzle, cavity or other flow channel under high pressure such as in extruder and injection molding machines.
  • the present invention provides an apparatus and method for removing and returning a stream of the fluid to be measured through a single port in the flow channel of the master processing apparatus and preferably via a single flow path to and from the flow channel.
  • the present invention also provides a fluid flow connector to and from a master flow channel and a fluid property measuring device or sensor, and a method and apparatus for performing a measurement of a fluid property and for using the measured property to control a processing operation or condition.
  • a sensor having a set of gears driven by a common drive shaft (which is in turn driven by a common motor) is connected via a hollow tubular connector to a single port in the master flow channel of a fluid processing apparatus.
  • the fluid flow connector comprises a tube having one end connected/ interconnected to the single port in the master flow channel and another end connected/ interconnected to the sensor apparatus.
  • the connector tube has at least two separate flow channels and typically comprises a first pipe disposed within a second pipe or a single tube subdivided by a barrier which sealably separates the interior of the tube into at least two separate flow channels.
  • the rate of input flow from the master channel through the connector to the sensor is typically slightly less than the rate of output flow from the sensor through the channel back to the master channel and the subsets of flow control gears or other pumping controls are typically configured for achieving such differential flow rates.
  • the measured and/or sensed properties of the fluid e.g. viscosity, pressure, temperature and the like
  • may be input into a computer controlled program or algorithm to generate/calculate selected values e.g.
  • viscosity calculated from pressure, temperature and the like) or, such measured/calculated/sensed values may be input into a PID (proportional, integral derivative) control mechanism for automatically controlling, maintaining, setting and/or selecting selected operating parameters of the polymer processing such as flow rate, temperature and the like according to the measured/sensed property, i.e. using the value of the sensed/measured property as a variable in an algorithm/program which generates signals which control other operations and operational components of the fluid processing machine and process.
  • PID proportional, integral derivative
  • an apparatus for measuring a selected property of a fluid flowing through a master flow channel comprising: a tube sealably connected to a port in the master flow channel and sealably connected to a sensor; the tube having a first upstream tube channel and a second downstream tube channel which are connected to each other such that fluid flows sequentially from the master flow channel through the port, the first tube channel, the second tube channel and back through the port into the master flow channel.
  • the apparatus preferably includes a fluid flow controller which routes a portion of the flow of the fluid from the master channel through the tube.
  • the fluid flow controller routes the fluid from the master flow channel through the first upstream tube channel at a first flow rate and through the second downstream channel back into the master flow channel at a second flow rate, the first flow rate being less than the second flow rate.
  • the tube typically comprises a first hollow pipe disposed within a second hollow pipe and has a first flow channel and a second flow channel.
  • the fluid flow controller typically comprises a first fluid flow drive mechanism and a second fluid flow drive mechanism, each fluid flow drive mechanism being disposed within the flow of fluid through the tube and being driven at a different rate by a common drive mechanism.
  • a method for measuring a selected property of a fluid flowing through a master flow channel comprising: routing a portion of the flow of the fluid from the master flow channel in one direction through a first channel in a tube sealably connected at one end to a port in the master flow channel and sealably connected at another end to a sensor; measuring a selected property of the fluid with the sensor; and, routing the flow of fluid from the first channel in a direction opposite to the first direction through a second tube channel in the tube through the port back into the master flow channel.
  • Fig. 1 is a side schematic view of an apparatus and method according to the invention
  • Fig. 2 is an exploded isometric view of an apparatus according to the invention showing a typical connection to a master fluid flow channel of a polymer processing machine
  • Fig. 3 is a side, close-up partial cross-sectional of certain components of the Fig. 2 apparatus which connect into the master flow channel of the polymer processing machine;
  • Fig. 4 is a side schematic isometric view of an alternative embodiment of a dual channel tube component of an apparatus according to the showing a tube divided into two channels by a barrier or plate.
  • Figs. 1-2 show a fluid flow routing and measuring apparatus 10 attached to the barrel 20 of a material processing machine (not shown) such as an injection molding machine or an extruder through which a fluid flow 15 of a selected material is flowing under elevated pressure and temperature, typically a polymer which is convertible to fluid at elevated temperature and pressure such as a polyolefins, polycarbonates, polyamides, polyesters, thermoplastic elastomers, polystyrenes, chocolate mixes, polymer solutions (i.e. solutions that are liquid at room temperature) and the like.
  • a material processing machine such as an injection molding machine or an extruder
  • a fluid flow 15 of a selected material is flowing under elevated pressure and temperature
  • a material processing machine such as an injection molding machine or an extruder
  • a fluid flow 15 of a selected material is flowing under elevated pressure and temperature
  • a material processing machine such as an injection molding machine or an extruder
  • a fluid flow 15 of a selected material is flowing under elevated pressure and temperature
  • the apparatus 10 is sealably interconnected to the barrel 20 via a master pipe or tube 30 which has a secondary pipe or tube 40 disposed within the master tube 30 for routing or siphoning off a relatively small stream 50 in one direction out of the path of the main stream 15 and eventually back in the opposite direction as a return stream 60 into the main process stream 15.
  • the two tubes 30, 40 are sealably connected to the wall 70 of the barrel 20 through a single aperture or port 75 in the wall of the barrel 20.
  • the sealed interconnection is effected in a conventional manner depending on the materials of which the wall 70 of the barrel and the tube 30 are comprised, typically in the case of metal materials, typically in the case of metal materials, a face sealed screwed in connection 57, Fig.
  • the siphoned off stream 50 flows through the hollow channel of the inner tube 40 the end of which communicates with the main flow stream 15, and the return stream 60 flows separately through the unoccupied portion or annular section 32 of the tube 30, both the siphoned off 50 and return 60 streams thus flowing/travelling through a single port 75 in the barrel 20 of the processing machine.
  • the shape/geometry of the tubes 30, 40 may be of any desired configuration, e.g. in cross section - circular, rectangular, square, triangular, as selected by the user, and may be rigid or flexible as selected by the user.
  • the tubes/pipes 30, 40 comprise high grade, high strength rigid metal materials which are resistant to deformation and corrosion when subjected to elevated temperatures and pressures as required in typical materials processing operation such as injection molding and extrusion.
  • the apparatus 10 comprises an enclosed, fluid sealed passage 105 configured within a spatially compact housing which is readily mountable on the outside surface of a barrel or other channel 20 via the single port or aperture 75.
  • the outer surface of tube 40 has spacer ribs 200, Fig. 3, projecting from the outer surface which serve to mount tube 40 securely within the inner cavity of tube 30 and to establish/maintain the integrity of the outflow channel 32 between the outer surface of tube 40 and the inner surface of tube 30.
  • the dual inflow and outflow channels in tube 30 are formed via a plate or barrier 37 which divides the interior of tube 30 into two separate channels, the inflow 50 and outflow 60 channels.
  • two pair of precision gears 80, 90 are disposed in the path of flow 105 of the fluid flowing through the apparatus 10.
  • the two sets of gears 80, 90 are both commonly driven by a single servo-motor 100 although each set of gears may be driven by separate motors as an alternative.
  • the intake set of gears 80 are disposed in a fluid sealed housing 82 which is positioned upstream in the flow path of the siphoned off stream relative to another fluid sealed housing 92 in which the second set of driven gears 90 are disposed.
  • the driven sets of gears 80, 90 thus act as a pump to force the siphoned off/redirected fluid stream from the master channel of the barrel to flow 106 through the fluid path(s) 105 of the apparatus 10 and back into the main stream 15 of master tube or barrel 20.
  • each set of gears 80, 90 are configured such that the teeth receive fluid and drive the fluid in a forward direction 106 through the fluid flow path 105 of the routing/measuring apparatus 10 as the gears are drivably rotated by motor 100.
  • the teeth of gears 80 and gears 90 each have a different selected volume or capacity for receiving fluid.
  • the teeth of the downstream set of gears 90 have a greater fluid receiving volume than the upstream set of gears 80 such that flow rate generated by gears 90 is greater than the flow rated generated by gears 80 and the apparatus is thus assured of not having a fluid pressure build up within the flow path 105 of the apparatus 10.
  • any conventional high performance fluid pump mechanism(s) may be employed as an alternative to gear pumps 80, 90 such pumps having a structural integrity sufficient to withstand the high pressure and temperature of the fluid being rerouted from the main stream 15 of the main channel 20, such fluid pressures typically ranging between about 0 and about 500 psi and fluid temperatures ranging between about 25° Centigrade and about 400° Centigrade in extrusion and injection molding processes.
  • Metering pumps are most preferably used as the pump mechanism, e.g. pump 80 and/or 90, in an apparatus according to the invention, typical examples of metering pumps being gear pumps and screw pumps.
  • the gear pumps 80, 90 may alternatively have the same fluid receiving volume/capacity or, also alternatively, gears 80 may have a greater fluid receiving volume/capacity than gears 90.
  • the downstream gears 90 or other selected pump is driven at a faster selected rate than the upstream gears 80 or pump such that the flow rate generated by the downstream pump is assured of being greater than the flow rate generated by the upstream pump so that a pressure buildup within the flow path 105 of the apparatus 10 is assured of being avoided.
  • the path of the fluid exiting pump 80 leads to/through a channel 110 of predetermined length and volume having a pair of pressure transducers 120, 130 positioned at opposite ends of the channel 110.
  • a temperature sensor 125 is positioned at a selected position within the flow path of the fluid, preferably within or near the channel 110 so as to sense a fluid temperature that is as close to the temperature of the fluid flowing between the transducers 120, 130 as possible.
  • the pressure transducers 120, 130 record/sense the pressure of the fluid at each end of the channel 1 10 and the sensed pressure data and/or sensed temperature data is input into an algorithm of a processor (not shown) which calculates the melt index or viscosity of the fluid and displays a value therefor to the user of the machine.
  • the determined/calculated viscosity value, and/or the sensed pressure, temperature, or other selected sensed property, may also separately be utilized as a variable input to another algorithm of a data processor or computer 140 which is interconnected to and controls the drive or other control mechanisms used to drive, operate or control other operating components of the processing machine, e.g. drive motors 210 for components such as for an injection screw of an extruder or injection molding machine (e.g.
  • a sensor for detecting a selected property of the fluid may be positioned at any position along or within the flow path 105 of the fluid such that the fluid flows past the sensor or the operative component of the sensor otherwise interacts with, views or touches the fluid 106 flow past or through the sensor, e.g. the tip end of a temperature or pressure sensor contacts the fluid, or the emitted beam of a photoemitting sensor interacts with the fluid flow such that the beam is altered by the fluid flow.
  • Control of the operation of the servomotor 100 may also be effected via an algorithm or computer program which causes the motor 100 to adjust the flow rate according to any predetermined program.
  • the apparatus 10 may also be operated with a single pump as opposed to dual pumps 80, 90, whereby a pressure buildup within channel 105 is avoided.
  • the polymer material is typically a solid at room temperature which is liquified by the processing machine, e.g. by shear forces created by the main barrel screw and/or by heaters arranged throughout various components of the processing machine.
  • the polymer material may also be a liquid or in liquid solution form at room temperature.

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  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Hydrology & Water Resources (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

L'invention concerne un appareil (10) permettant de mesurer une propriété choisie d'un fluide (15) s'écoulant dans un canal d'écoulement maître (20). Ledit appareil est constitué d'un tube (30) hermétiquement raccordé à un orifice dans le canal d'écoulement maître et à un capteur (100). Le tube a un premier conduit en amont (42) raccordé à un second conduit en aval (42), le fluide s'écoulant alors séquentiellement du canal d'écoulement maître à travers l'orifice, le premier conduit, le second conduit et retournant dans le canal d'écoulement maître par l'orifice.
PCT/US2000/011338 1999-04-29 2000-04-27 Appareil et procede de mesure des proprietes de fluides Ceased WO2000066993A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU44963/00A AU4496300A (en) 1999-04-29 2000-04-27 Apparatus and method for measuring fluid properties

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13157299P 1999-04-29 1999-04-29
US60/131,572 1999-04-29

Publications (1)

Publication Number Publication Date
WO2000066993A1 true WO2000066993A1 (fr) 2000-11-09

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/011338 Ceased WO2000066993A1 (fr) 1999-04-29 2000-04-27 Appareil et procede de mesure des proprietes de fluides

Country Status (2)

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AU (1) AU4496300A (fr)
WO (1) WO2000066993A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005116105A1 (fr) * 2004-05-07 2005-12-08 Zimmer Aktiengesellschaft Procede de commande de processus dans la fabrication de polyesters ou de copolyesters
WO2011082758A1 (fr) * 2010-01-08 2011-07-14 Grundfos Management A/S Cellule de contrôle et système de contrôle de fluide

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018089A (en) * 1976-05-05 1977-04-19 Beckman Instruments, Inc. Fluid sampling apparatus
US4817416A (en) * 1988-06-13 1989-04-04 Rheometrics, Inc. On-line rheological measurements

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4018089A (en) * 1976-05-05 1977-04-19 Beckman Instruments, Inc. Fluid sampling apparatus
US4817416A (en) * 1988-06-13 1989-04-04 Rheometrics, Inc. On-line rheological measurements

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005116105A1 (fr) * 2004-05-07 2005-12-08 Zimmer Aktiengesellschaft Procede de commande de processus dans la fabrication de polyesters ou de copolyesters
WO2011082758A1 (fr) * 2010-01-08 2011-07-14 Grundfos Management A/S Cellule de contrôle et système de contrôle de fluide
EP2345886A1 (fr) * 2010-01-08 2011-07-20 Grundfos Management A/S Cellule d'essai et système de contrôle de liquide

Also Published As

Publication number Publication date
AU4496300A (en) 2000-11-17

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