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    Home > Active Ingredient News > Drugs Articles > HAAKE Hack Viscotester iQ rheometer tests the yield stress of toothpaste.

    HAAKE Hack Viscotester iQ rheometer tests the yield stress of toothpaste.

    • Last Update: 2020-07-18
    • Source: Internet
    • Author: User
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    keywords
    rheological, yield stress, toothpaste, user expectations
    introduction
    toothpaste, is a sticky and elastic daily productsToothpaste has a complex structure in which various components affect its rheomorphia properties, such as abrasives that support the cleaning function of the toothbrush, a moisture factor that prevents the dryside of the toothpaste and the connecting agent from separating the water composition and solid phase of the toothpasteRheotransformation plays an important role in the development and production of toothpaste products, including the filling of toothpaste, packaging and user satisfactionThe main focus of this paper is the yield stress of different toothpastesThe yield stress of toothpaste is directly related to how much force is required to destroy its original structure and make it flowSqueeze is the main way to get toothpaste outTherefore, sufficient extrusion force must be applied and more than the yield stress of the toothpaste must be applied to complete this processTwo types of toothpaste were selected for testing, adult and children's toothpaste, and were tested and evaluated according to the description of the literaturetest instrument
    this article is tested using the Thermo-Flying Hack Viscotester iQ intelligent rheometerUsing an EC motor, this instrument can be tested in a variety of methods, including control rates and stress controls, with a wide range of measurementsThe temperature control unit is a self-contained Pal patch system that can be implemented from -5 to 160 degrees CThe interval is fast and stable for temperature control The experiment was carried out with a 35 mm diameter parallel plate clamp, which was used to prevent slipping Measuring the lower plate has the same diameter and surface as the upper plate, which ensures ideal test conditions and you-based sample filling In addition, such fixtures require very little sample size, short sample time and temperature balance time, and easy to clean In addition, the anti-volatile cover was used in the experiment to reduce the evaporation and temperature gradient of water inside the sample sample preparation
    first, squeeze a small amount of toothpaste into the measuring plate (Figure 1) and then lower the measuring plate to the set measurement gap This process, including extrusion and sample filling, gives the sample a pre-shearing effect, so a relaxation time is required to remove stress and other effects on the experiment Figure 1: Thermo Semer Fly HAAKE Hack Viscotester iQ Portable RheoWin software Hack RheoWin software and other operationmethods
    Hack Viscotester iQ portable rheumator can be operated in a variety of ways, including the use of Hack RheoWin software to achieve more da operational flexibility The experiment was as follows: When the sample sits at 20 degrees C for 5 minutes, the instrument applies a shear stress from 20-400Pa in a dating manner to 180 seconds and collects 180 data points, adding an interrupt condition to the program when the deformation exceeds 20 (2000%) The results of the deformation change of the experiment on shear stress are graphed in two logons, and the yield stress of the sample is fitted according to the tangent intersection method , the Thermo-Flying Hack Viscotester iQ portable rheometer can also be used to use the built-in measurement method simply without working alone through the software (Figure 2), especially recommended for experimenting in this way during standard testing and evaluation, which is quick and easy Fig 2: Thermo SemerFei HAAKE Hack Viscotester iQ Portable Rifier used the experimental results with the discussion the test curve sized with the of adult and children toothpaste shown in Figure 3 Two experiments were conducted on each sample, showing high repeatability The yield stress of the sample is summarized in Table 1 As expected, the yield stress of children's toothpaste is approximately 55Pa, which is much lower than the 215Pa of adult toothpaste Hack RheoWin software offers two yield stress analysis modes, automatic and manual (Figure 4) When the instrument is not connected to the software, only automatic analysis mode can be used Manual mode analysis makes it more flexible to accurately evaluate the data The range of data commonly used to assess yield stress can be obtained directly by observation, as shown in Table 1 But yield stress often depends on sample preparation, testing processes, and evaluation methods Figure 5 shows the difference between the results obtained for children's toothpaste before going to automatic mode and manual mode The change of the shape of the two toothpastes over time at 3:20 degrees C
    Table 1: Toothpaste yield stress statistics Figure 4 HackRheoWin software analysis yield stress pattern, automatic and manual figure 5 on the children's toothpaste automatic mode and manual mode of the result difference
    summary toothpaste yield stress is to meet the expectations of different user groups of an important variable parameter Yield stress depends to a large extent on the preparation history of the sample, the test conditions and the evaluation method The Thermo-Flying Hack Viscotester iQ portable rheumator is a composite instrument for modern quality control with a modular design with a wide range of accessories and tests to meet all test needs The instrument features fast connection and identification of fixtures and intelligent lifting, as well as a variety of flexible operating methods Reference
    1 H.-M Petri, E.-M Kutschmann, "Rheio Slance of The I.C Of The I.R.) Thermo Scientific Science Science Note V142
    2.DIN Technical Report N 143 of the NPF/NAB-AK 21.1 "Rheology" (Pigments and Extenders) 3.C K?chenmeister, J Nijman, "
    The
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