GB/T 22427.7 "Determination of Starch Viscosity" standard is a national standard for the determination of starch viscosity. It stipulates the method of testing the viscosity of starch and modified starch with Rotational Viscometer and Brabande viscometer, which is mainly suitable for dry powdered starch and modified starch.
Two viscosity test methods are proposed in the standard. The first is the Rotational Viscometer method. The Rotational Viscometer and constant temperature Water Bath are used to combine the viscosity value of the starch emulsion, and the viscosity value at different temperatures is read by controlling different temperature points. The first method is a relatively simple method, and it is also a relatively common supporting method. NBCHAO Technology recommends a simple combination of some viscometers + constant temperature grooves.
| NDJ-4S+LC-1008Thermostatic tank, digital display rotary viscometer |
| Specifications: measurement range 20~ 200000mPa · s, rotor specifications L1 #, L2 #, L3 #, L4 #, reproducibility ± 1% F. S, measurement accuracy ± 5% FS, power supply voltage special power adapter (input 100~ 240V 50~ 60Hz), rotor speed 0.3/0.6/1.5/3/6/12/30/60rpm, display information viscosity, speed, percentile torque, rotor number and the selected rotor at the current speed The maximum viscosity value that can be measured, etc., the temperature control range of the thermostatic groove is -10~ 100 ℃, the thermostatic groove Temperature control mode intelligent PID, temperature fluctuation ± 0.05~ 0.1 ℃, temperature resolution 0.1 ℃, working tank volume 8L, thermostatic tank opening size 175 * 145 * 150mm, number of holes 1, circulation mode internal and external circulation, pump flow 12L/min, pump maximum pressure 0.2bar, pump maximum suction 0.1bar, power supply voltage 200~ 230, VAC, thermostatic tank external size 415 * 410 * 426mm, temperature display LED, heating power 2000W, cooling capacity (10 ℃) 300W, pump type pressure/suction pump, pump connection interface M16x1, instrument fixed Mode Desktop, allowing continuous operation of 100, allowing ambient temperature of 5~ 32 ℃, allowing relative humidity of 80%, frequency of 50Hz, in line with standard JJF 1030-2010, speed control mode eight speed | |
| NDJ-5T+DC0506N Rotational Viscometer Kit |
| Specifications: display mode touch type, measurement range 1~ 100000mPa · s, rotor specifications 1 #, 2 #, 3 #, 4 #, rotor speed 6/12/30/60rpm, reproducibility ± 0.5% F. S, measurement accuracy ± 1% F. S, power supply voltage Wide voltage operation (110V/60Hz or 220V/50Hz), external size 300 * 300 * 450mm, weight 4kg, capacity 300~ 400ml, display shear response/shear rate Standard, timing function Standard, viscosity curve Real-time display of viscosity curve , the kinematic viscosity needs to be displayed after entering the density of the sample, the temperature probe is equipped with a temperature probe interface as standard (a temperature probe needs to be selected), the automatic scanning function automatically scans and recommends the appropriate combination of rotor and rotational speed, and saves the measurement results up to 30 groups (including rotor, rotational speed, temperature, time, etc.), save the measurement results, save up to 30 sets of data (including viscosity, temperature, rotor, rotational speed, shear rate, shear stress, time, density, kinematic viscosity, etc.), data interface data, Curve can be printed (standard with a print interface, you need to buy a printer) , temperature range -5 ℃~ 100 ℃, temperature accuracy 0.1 ℃, opening size 75mm round hole, suitable for beaker 400ml high-temperature cup |
The second method is the Brabant viscometer method, which is a relatively intelligent viscometer equipment with its own temperature control and heating function. Recommended in the standard are Viscograph-E and Viscograph-PT100 viscometers. Based on years of experience, NBCHAO has selected viscometer equipment solutions that are more cost-effective and can also meet the requirements of this starch viscosity test from many domestic brands.
FDV-T starch viscometer, its functions include: automatic lifting, stepless adjustable rotor speed of the viscosity measuring instrument (0.1-300 rpm), built-in automatic optimization temperature program control (adjustable lifting/cooling rate, lifting/cooling speed up to 8 degrees/min), a dedicated starch F1 rotor, a sample volume of 30ml, the temperature is directly measured in the sample material, the automatic measurement and sample data evaluation are all fully automated by the FDV starch gelatinization viscosity characteristic curve analysis software. Real-time display: measurement time progress, current measured temperature, set temperature, measured viscosity value. In line with the national standard GB/T22427.7-2008, GB/T2485.3-2010.
Below is the graph of the test, which basically meets the standard requirements.
