WO1987001198A1 - Procede et appareil de determination de la viscosite - Google Patents

Procede et appareil de determination de la viscosite Download PDF

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Publication number
WO1987001198A1
WO1987001198A1 PCT/AU1986/000238 AU8600238W WO8701198A1 WO 1987001198 A1 WO1987001198 A1 WO 1987001198A1 AU 8600238 W AU8600238 W AU 8600238W WO 8701198 A1 WO8701198 A1 WO 8701198A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
heat transfer
transfer means
stirring
liquid
Prior art date
Application number
PCT/AU1986/000238
Other languages
English (en)
Inventor
Rodney Ian Booth
David William Edwards
Colin Walter Wrigley
Robert Alexander Orth
Original Assignee
Commonwealth Scientific And Industrial Research Or
The Bread Research Institute Of Australia Limited
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 Commonwealth Scientific And Industrial Research Or, The Bread Research Institute Of Australia Limited filed Critical Commonwealth Scientific And Industrial Research Or
Priority to DE8686905149T priority Critical patent/DE3678560D1/de
Priority claimed from AU61569/86A external-priority patent/AU587273B2/en
Publication of WO1987001198A1 publication Critical patent/WO1987001198A1/fr

Links

Classifications

    • 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
    • G01N11/10—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material
    • G01N11/14—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
    • 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
    • G01N33/10—Starch-containing substances, e.g. dough
    • 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
    • G01N2011/0046—In situ measurement during mixing process
    • G01N2011/0053—In situ measurement during mixing process using ergometry; measuring power consumption

Definitions

  • the present invention relates to a method for measuring the viscosity of fluids and suspensions at varying temperatures and to equipment for carrying out the method.
  • the present invention is particularly suitable for determining the level of sprouting or germination in cereal grains and derived cereal products.
  • Other applications envisaged include quality control in the food and polymer industries.
  • the term "Fluid” as used throughout this specification is intended to include homogeneously mixed suspensions.
  • the suitability of cereal grain for making bread and other foodstuffs is affected by the degree of sprouting or germination of the grain before harvest.
  • Natural biological processes connected with the sprouting of cereal crops result in the production of various substances, of which the enzyme amylase has the most notable influence on cereal quality.
  • Amylase reacts with cereal starches causing them to be broken down at a rate which is dependent on amylase level and on temperature.
  • it is possible to make a reasonably accurate estimate of sprouting activity in a cereal by monitoring the viscosity of an aqueous paste of a sample while it is heated under controlled conditions.
  • a well-known test which is based on the viscosity change in an aqueous cereal paste during heating is the Falling Number Test, and this involves measuring the time taken for a plunger to fall under gravity through a heated sample.
  • the present invention offers a test which is relatively quick, cheap and moreover, readily adapted for substantially automatic operation thereby avoiding a need for skilled personnel or back up laboratory factilities.
  • a method for measuring the viscosity of a liquid (as hereinbefore defined) at known temperatures which comprises:
  • the present invention When used to determine the level of sprouting or germination in cereal grains and derived cereal products the present invention, as with the Falling Number Test, is based largely on the reaction of amylase with starches, but in this case viscosity is indicated by resistance to the rotation of a stirring means in a heated aqueous paste. As the temperature of the mixture increases the starch content of the cereal gelatinizes thus making the mixture more viscous. The activity rate of the amylase rises, attacking the starch, and thus operates to reduce the viscosity of the mixture. These two competing effects create, after a measured time, a paste of a certain viscosity.
  • the said temperature adjustment and said stirring are commenced substantially simultaneously.
  • viscosity of the liquid is related to the temperature of the liquid and the power consumed in rotating the stirring means at a particular speed
  • viscosity measurements can be commenced almost immediately.
  • the liquid be retained in a vessel which is brought into contact with a heat transfer means. Most preferably the vessel is clamped within the heat transfer means. Such clamping should be of sufficient strength to slightly deform the walls of the vessel so that they substantially conform to the face of the heat transfer means. In this way it is possible to remove any air gap which may be present between the vessel and the heat transfer means due to the manufacturing tolerances of these components. Such steps enhance the speed at which this method may be carried out.
  • the heat transfer means may be of any of a number of forms but preferably it is a metallic block.
  • the metallic block is axially split into two sections which are adapted to be brought into contact with the vessel. If the liquid being tested is a cereal/water mixture initially it may be necessary to rotate the stirring means relatively rapidly to promote homogenity. The rotation speed of the stirring means may then be reduced, maintained constant by, say, electronic means, and at a known time after the time of temperature adjustment the power being consumed by the motor can be measured.
  • the degree of sprouting in a particular cereal may be ascertained by preparing a cereal/water paste of about 25% w/v composition by adding a sample of the cereal (preferably in the form of fine particles) to water at a predetermined temperature in a vessel in clamped contact with a heat transfer means.
  • the degree of sprouting may be derived by relating the power-consumption reading for any particular stirrer rotation speed to tables of readings obtained from- testing of control samples, or the equipment may, for example, incorporate circuitry to give a direct read-out of sprouting or some other convenient indicator of sample quality.
  • Heat was provided by a 600 watt element wound around the heating chamber.
  • an apparatus for measuring the viscosity of a liquid which comprises:
  • the motor used to drive the stirrer is an electric motor.
  • the vessel may be made of any suitable material, preferably a heat conductive material and is preferably of a disposal type in order that the vessel does not require cleaning after each test. Most preferably a thin walled (approximately 0.3 mm) aluminium canister is used.
  • the heat transfer means is preferably a metallic block.
  • Such heating chamber is adapted to accommodate the reaction vessel and preferably is clamped around the reaction vessel in order to achieve a constant heating rate.
  • the heat transfer means may be made out of any heat conductive material and preferably comprises a solid copper or aluminium block.
  • the heating chamber is further split along an axis (preferably the central axis) and mounted so that one section is fixed and the other portion is free to move.
  • Pressure applying means may further be provided in order to provide a sufficient force to cause the two sections of the heating chamber to be pressed together.
  • Such pressure applying means may be a mechanical actuator attached between the moveable portion of the heating chamber and some other rigidly fixed body such as a retaining framework.
  • the pressure applying means is an electrically or mechanically . driven mechanism which is automatically activated upon the commencement of the rotation of said stirring means.
  • a lever system may also be provided for either manual or automatic use to separate the two portions of the heating chamber so as to allow the insertion of the reaction vessel into place.
  • the motor is preferably connected to the stirrer by a coupling so that it may be detached from the stirrer.
  • the stirrer is provided with pins located at either side of the top of the stirrer which are adapted to couple with helical slots located to a fixture at the end of the motor shaft.
  • the equipment provide means for driving the stirrer at a known speed.
  • Accurate speed control of the motor can be achieved through the use of electronics.
  • the motor speed should be controlled to better than +1%.
  • the temperature of the heating chamber should be accurately determinable and controllable for tests of different grains or liquids.
  • Another feature which is provided in a preferred embodiment of this invention is the facility to accurately time the initiation of the heating effect.
  • the heat transfer means transmits negligible heat to the vessel prior to the clamping action it is the clamping action which is preferably used to trigger the test cycle.
  • a microswitch can be used to this effect attached to the lever system and monitored by a microprocessor - the operation of the microsw.itch initiating a test cycle.
  • the equipment of this invention may therefore also be provided with instrument electronics comprising some or all of the following sub units:
  • Temperature controller such controller controls the temperature of said chamber.
  • this is variable from between 25°C and 100 C for testing of starch properties and for testing wheat for sprouting damage is most preferably set at approximately 92°C.
  • a weighed, ground wheatmeal or starch sample - is placed in the vessel with a measured quantity of water.
  • the motor is positioned over the vessel and is connected to the stirrer.
  • the heat transfer means is brought into contact with the vessel simultaneously with the initiation of the rotation of the stirring means and heat is conducted into the sample through the walls of the reaction vessel. This causes the starch to gelatinize.
  • the motor is first set to operate at a fast, or mix, speed to suspend the particles of the mixture and is then slowed to a measuring speed at which time the power being consumed by the motor is measured.
  • Figure 1 is side elevation of the mechanical assembly of an apparatus made in accordance with the invention, partially sectioned.
  • FIG. 2 is a perspective view of an apparatus made in accordance with the invention.
  • Figure 3 is a perspective view of a stirring paddle used in the apparatus of the invention.
  • a heating chamber 1 is formed from a solid metal block fitted with suitable electrical heating elements (not shown) and is dimensioned approximately 70x65x65 mm.
  • This heating chamber is axially split into two portions.
  • the first half 1A is fixed.
  • the second half is moveable.
  • the fixed portion 1A and moveable portion IB are shaped such that when they are pressed together there is provided a cylindrical recess 11.
  • Attached to the moveable portion 1(B) is a mechanical actuater 6.
  • Mounting of the blocks is achieved by insulating supports 22.
  • the actuator 6 coacts against the end wall of the framework 9 at its remote end via a rubber spring 15. Force applied by the mechanical actuator 6 is controlled by compression of the rubber spring 15 interrupting (via a icroswitch 16) the current to the actuator 6.
  • mechanical actuator 6 applies a force of approximately 1500 Newtons on the heating chamber 1.
  • the cylindrical recess 11 is of a diamter which when the two halves of the heating chamber are brought together the reaction vessel 2 is forced to conform to the walls of the recess 11, and contact is obtained substantially over the whole area of the sides of the reaction vessel 2.
  • the reaction vessel 2 is a thin walled (0.3 mm) aluminium canister annealled to improve conformability.
  • a rotatable stirrer 3 is provided which comprises a stem 3A and paddle 3B.
  • the stirrer 3 is adapted to be received into the reaction vessel 2.
  • a plate 12 and coupling pins 13 At the top of the stirrer 3 there is provided a plate 12 and coupling pins 13.
  • An electric motor 5 is positioned above the reaction vessel 2 and is connected a helical coupling (not shown).
  • a lever 7 is positioned to pivot on bearings 17 which also carries motor 5. When lever 7 is brought forward and down motor 5 is accurately positioned over the central axis of the reaction vessel 2.
  • the ejection assembly is comprised of body 20 and spring loaded plunger 21.
  • the heating chamber 1 and mechanical actuator 6 are mounted * within framework 9. Electric motor 5 is electrically connected to case 10 which contains electronic components which cannot be seen in the figures.
  • the electronic components contained in case 10 include a microprocessor which controls the following sub units:
  • a digital display 8 is provided at the front of case 10 and is of the light emitting diode type.
  • lever 7 In operation lever 7 is lifted up and back to expose recess 11 in the block 1.
  • Switch 23 signals the electronics to relax the actuator 6 thus parting the halves of the block 1A and IB.
  • Reaction vessel 2 containing a sample for analysis and stirrer 3 is placed into recess 11 until the base of reaction vessel 2 is in contact with the ejecter plunger 21 (being in its raised position) .
  • Handle 7 is then pivoted forward bringing buffer ring 18 in contact with the rim of the reaction vessel 2.
  • Hand pressure on lever 7 forces the vessel 2 down against the plunger 21 which retracts into the plunger body 20, until the buffer ring 18 contacts the upper surface of the blocks 1A and IB.
  • Switch 23 signals the electronics to close the actuator, moving block IB against block 1A and hence slightly deforming the reaction vessel 2 in the recess 11.
  • lever 7 is moved back to open heating chamber 1.
  • Reaction vessel 2 containing a sample such as a weighed ground wheatmeal or starch sample is partially filled with a measured quantity of water and is then placed into the recess between the fixed portion 1(A) of heating chamber 1 and the moveable portion 1(B) of heating chamber 1.
  • the lever system 7 is released and the mechanical actuator 6 exert a pressure on moveable portion 1(B) of heating chamber 1 causing the separated portions 1(A) and 1(B) to clamp the reaction vessel 2 firmly.
  • the clamping force is sufficient to deform the walls of the reaction vessel 2 to the shape of cylindrical recess 11. This removes any slight air gap which may be present between reaction vessel 2 and the walls of cylindrical recess 11 and promotes more efficient and rapid heating of reaction vessel 2 and hence its contents.
  • switch 23 signals the electronics to cause the motor 5 to rotate.
  • the helical slots in the coupling at the end of motor 5 engage with pins 13 and the stirrer 3 is lifted clear of the base of the vessel 2 to remove friction between the two.
  • a frusto conical canister is used as sample container, being forced from above into close contact with a heating block of matching shape.
  • Heating of the heating chamber 1 is provided by a resistance within the block and a temperature sensor may also be mounted within the heating chamber 1, the whole being thermally insulated. Heat is conducted into, the sample through the walls of the reaction vessel and if the sample contains a cereal gelatinises the starch.
  • the motor is first run at a speed of approximately 800 r.p.m. to mix the solution and suspend the particles of the mixture and then run at a slower speed of approximately 200 r.p.m. for measurement of the viscosity.
  • the viscosity of the sample is converted by the microprocessor (as previously described) and presented to the user as a digital result or analog signal for further display either on the digital display 8 or a chart record (not shown) .
  • the actuator ' 6 is opened releasing reaction vessel 2. Then at any convenient time for the operator the lever 7 is lifted and the reaction vessel 2 is ejected by plunger 21 to a point where the vessel can be removed completely by the operator and discarded.
  • the equipment described has application in any situation where viscosity of fluids must be determined. In particular , where viscosity at higher or lower temperatures is required, the precision obtained by the heating chamber described is especially useful. It is obviously possible and within the ambit of the present invention to fit an electronic cooler to the heating chamber to provide low temperature or heat/cooled cycle viscosities.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Food Science & Technology (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Medicinal Chemistry (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

Un procédé permettant de mesurer la viscosité de liquides, y compris des suspensions mélangées de manière homogène, à des températures connues consiste à régler rapidement la température dudit liquide, à agiter ce dernier par rotation d'un moyen agitateur (3) à l'intérieur dudit liquide à une vitesse mesurée, et à mesurer l'énergie consommée par la rotation dudit moyen agitateur à ladite vitesse. L'invention comprend également un appareil permettant la mise en oeuvre du procédé et comportant un récipient (2), un moyen de transfert de chaleur (1) conçu pour recevor ledit récipient et pouvant rapidement régler la température de son contenu, un moyen agitateur (3) destiné à être positionné dans ledit récipient, un moteur (5) d'entraînement dudit moyen agitateur, un régulateur de la vitesse de l'agitateur, et un organe de mesure de la consommation d'énergie du moteur à un quelconque moment donné.
PCT/AU1986/000238 1985-08-19 1986-08-18 Procede et appareil de determination de la viscosite WO1987001198A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8686905149T DE3678560D1 (de) 1985-08-19 1986-08-18 Verfahren und vorrichtung zur bestimmung der viskositaet.

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AUPH201385 1985-08-19
AUPH2013 1985-08-19
AUPH4578 1986-02-13
AUPH457886 1986-02-13
AU61569/86A AU587273B2 (en) 1985-08-19 1986-08-18 Method and apparatus for determination of viscosity

Publications (1)

Publication Number Publication Date
WO1987001198A1 true WO1987001198A1 (fr) 1987-02-26

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Application Number Title Priority Date Filing Date
PCT/AU1986/000238 WO1987001198A1 (fr) 1985-08-19 1986-08-18 Procede et appareil de determination de la viscosite

Country Status (1)

Country Link
WO (1) WO1987001198A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831633A1 (de) * 1988-09-17 1990-03-22 Heidolph Elektro Gmbh & Co Kg Anordnung zum messen von drehmomenten, insbesondere an buerstenlosen gleichstrommotoren
EP0492967A2 (fr) * 1990-12-20 1992-07-01 Purina Mills Inc. Dispositif pour déterminer la durabilité d'agglomérés
WO1999002965A1 (fr) * 1997-07-08 1999-01-21 Jan Perten Procede et dispositif servant a analyser un echantillon de produit possedant une teneur en amidon
DE19752221A1 (de) * 1997-11-25 1999-06-02 Steinecker Maschf Anton Verfahren und Vorrichtung zur Viskositätsmessung von Fluiden
DE19930684A1 (de) * 1999-07-02 2001-01-18 Windmoeller & Hoelscher Verfahren und Vorrichtung zur Verarbeitung eines viskosen Mediums
WO2003103399A1 (fr) * 2002-06-10 2003-12-18 Cerealia R & D Ab Procede et dispositif de preparation de pate
DE102018122257A1 (de) * 2018-09-12 2020-03-12 Brabender Gmbh & Co.Kg Verfahren und System zur Tarierung und/oder Kalibrierung eines Rotations-Rheometers

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924969A (en) * 1931-01-20 1933-08-29 Marion B Wheeler Device for testing the viscosity of liquids
US2660885A (en) * 1951-07-24 1953-12-01 Texas Co Recording viscosimeter
US4173142A (en) * 1977-07-22 1979-11-06 Werner Heinz Rotary viscometer
US4445365A (en) * 1982-05-17 1984-05-01 Selby Theodore W Tapered bearing simulator-viscometer

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1924969A (en) * 1931-01-20 1933-08-29 Marion B Wheeler Device for testing the viscosity of liquids
US2660885A (en) * 1951-07-24 1953-12-01 Texas Co Recording viscosimeter
US4173142A (en) * 1977-07-22 1979-11-06 Werner Heinz Rotary viscometer
US4445365A (en) * 1982-05-17 1984-05-01 Selby Theodore W Tapered bearing simulator-viscometer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0233923A4 *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3831633A1 (de) * 1988-09-17 1990-03-22 Heidolph Elektro Gmbh & Co Kg Anordnung zum messen von drehmomenten, insbesondere an buerstenlosen gleichstrommotoren
EP0492967A2 (fr) * 1990-12-20 1992-07-01 Purina Mills Inc. Dispositif pour déterminer la durabilité d'agglomérés
EP0492967A3 (en) * 1990-12-20 1992-11-19 Purina Mills Inc. On-line pellet durability tester
WO1999002965A1 (fr) * 1997-07-08 1999-01-21 Jan Perten Procede et dispositif servant a analyser un echantillon de produit possedant une teneur en amidon
US6250147B1 (en) 1997-07-08 2001-06-26 Larena Ag Device and method for analyzing starch-containing product
AU753001B2 (en) * 1997-07-08 2002-10-03 Larena Ag A method of analyzing a sample of a product having a starch content, and an apparatus for such analyze
DE19752221A1 (de) * 1997-11-25 1999-06-02 Steinecker Maschf Anton Verfahren und Vorrichtung zur Viskositätsmessung von Fluiden
DE19752221C2 (de) * 1997-11-25 1999-12-09 Steinecker Maschf Anton Verfahren zur Viskositätsmessung von Maischen
DE19930684A1 (de) * 1999-07-02 2001-01-18 Windmoeller & Hoelscher Verfahren und Vorrichtung zur Verarbeitung eines viskosen Mediums
DE19930684C2 (de) * 1999-07-02 2001-10-11 Windmoeller & Hoelscher Verfahren und Vorrichtung zur Verarbeitung eines viskosen Mediums
WO2003103399A1 (fr) * 2002-06-10 2003-12-18 Cerealia R & D Ab Procede et dispositif de preparation de pate
DE102018122257A1 (de) * 2018-09-12 2020-03-12 Brabender Gmbh & Co.Kg Verfahren und System zur Tarierung und/oder Kalibrierung eines Rotations-Rheometers

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