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    Home > Active Ingredient News > Drugs Articles > Measuring method of internal stress tester for glass bottle

    Measuring method of internal stress tester for glass bottle

    • Last Update: 2018-07-03
    • Source: Internet
    • Author: User
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    Jinan Sanquan Zhongshi test the internal stress of vials and ampoules according to the requirements of national drug packaging material standard (2015 Edition), ybb00332003-2015 sodium calcium glass controlled injection bottle, ybb000332005-2005 sodium calcium glass infusion bottle, ybb00332002-2015 low borosilicate glass ampoule Yly-03 is suitable for pharmaceutical enterprises, Glassworks and laboratories to measure the stress value of optical glass, glass products and other optical materials

    Yly-03 has two kinds of testing modes, qualitative and quantitative

    It has a wide range of application

    Now, the small edition focuses on the internal stress testing methods of glass bottles

    (I) qualitative measurement method (1) before measurement, check whether the zero position of the instrument is correct according to the following methods, put 1 / 4 wave plate into the optical path with the wave plate conversion paddle, turn the polarizer button to make the field of view Zui dark, press the reset key to display the window value as "0"

    (the light path of the instrument has been adjusted before leaving the factory) (2) use the wave light conversion button to change 1 / 4 wave plate into full wave plate, and the field color is purple red

        (3) Place the test piece in the interference field of view, observe the whole surface of the test piece through the polarizing mirror, and qualitatively judge the stress of the glass test piece (annealing quality of the glass test piece) according to the interference color

    If the color of the test piece is basically unchanged or only slightly changed (from purplish red to purple), it indicates that the annealing quality is good; if the interference color changes greatly on some parts of the test piece (for example, green or yellow), it indicates that The annealing quality is poor

    (4) if semi quantitative test is needed, rotate the test piece around the optical axis of the instrument, observe the change of interference color at the same time, find out the parts with large change of Zui, and determine the high color sequence and low color sequence of Zui

    Generally, the test piece needs to rotate 90 ° from one position to another

    Example: the birefringence path difference of the tested part can be calculated

    For example, the high color sequence of Zui in a certain part of the specimen is sky blue, and the optical path difference is ′ = 664 nm according to table 1

    It is the result of superposition of the optical path difference between the test piece and the full wave plate (the fast axis of the test piece is parallel to the fast axis of the full wave plate), substituting ′ into the formula ①: & = 664-565 = 99 nm, the same part is in Zui low color sequence position after 90 ° rotation of the test piece, the interference color is brown yellow, and the optical path difference is ′ = 430nm according to table 1

    It is the result of the subtraction of the optical path difference between the test piece and the full wave plate (the fast axis of the test piece is parallel to the slow axis of the full wave plate)

    The ′ is substituted into the formula ②: & 565-430 = 135nm

    The difference of the two measured results & values is caused by the human eye's discrimination color accuracy and the instrument's accuracy

    & ′ = (99 + 135) / 2 = 117 nm (2) before quantitative measurement (1) the zero should be adjusted first

    Put 1 / 4 wave light into the optical path, turn the polarizer to make the field of view Zui dark, and press the clear key to make the display "0"

    (2) there is no obvious interference color in the field of view of the stress tester when the birefringence optical path difference of the tested piece is no more than the first level fringe

    When the deflection mirror is in the "0" position, there are two dark stripes separating the bright areas in the middle of the test piece and near the upper and lower surfaces

    Rotate the polarizing mirror so that the two stripes move towards the middle of the specimen and coincide

    At this time, the value in the display window is the birefringence path difference of the specimen

    (3) inspection of glass bottles and cans in glass products: in accordance with the national standard test method for internal stress of glass bottles and cans

    Experimental steps: the test of the internal stress in the sample of the colorless glass bottle (1) the test of the bottom of the colorless test sample: 1

    Take down the sensitive color plate, put one of the four wave plates into the field of view, and adjust the zero point of the polarizing stress meter to make it appear the dark field of view

    2

    Place the sample in the field of view, and observe the bottom from the mouth

    At this time, there will be a dark cross in the field of view

    If the stress of the sample is small, the dark cross will be blurred

    3

    Rotate the deflector to separate the dark cross into two arcs moving in the opposite direction

    As the dark area moves outward, blue gray appears on the concave side of the arc and brown appears on the convex side

    If the stress value of a selected point is measured, rotate the polarizing mirror until the blue gray of the point is just replaced by brown

    4

    Rotate the test object around the axis, find out the big stress point of Zui, and rotate the deflector until the blue gray is replaced by brown

    5

    Record the rotation angle of the polarizer at this time, and measure the thickness of this point

    (II) inspection of the side wall of colorless sample: 1

    Remove the sensitive color plate, put one quarter wave plate into the field of view, adjust the zero point of the polarizing stress instrument to make it appear dark field of view

    2

    Put the sample into the field of view, so that the axis of the sample is 45 ° with the plane of polarization, and then there are different areas of light and dark on the side wall

    3

    Rotate the deflector until the dark area on the side wall meets, just replacing the bright area completely

    4

    Rotate the test object around the axis to determine the large stress area of Zui

    5

    Record the setting angle of the inspection mirror in the large stress area of Zui, and measure the original thickness of both sides of the wall with the chy-b glass bottle thickness gauge (record the sum of the wall thickness of both sides)

    Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd

    has advanced testing technology, packaging testing equipment and professional laboratory

    It is committed to providing comprehensive and quality control solutions for customers in the industry!
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