The method and procedure of measuring the internal stress of medical glass bottle by polarizing stress meter

Taking yly-05 digital polarizing stress instrument developed by Jinan Saicheng as an example, this paper has carried out a special test on the internal stress of infusion glass bottle provided by a pharmaceutical enterprise Through the detailed record of the test process, test results and other data, it provides a reference direction and method for the majority of enterprises in need Key words: internal stress of glass bottle, internal stress of medical glass bottle test, quantitative polarizing stress meter, internal stress test of infusion bottle, annealing degree tester of glass bottle, internal stress test of colored glass bottle 1 The size of internal stress value for testing purpose plays a decisive role in the quality of medical glass bottle, which is mainly determined by the annealing process during the bottle burning process 。 Once the internal stress of medical glass bottles such as infusion bottles is not up to the standard, the mechanical strength and thermal stability of glass bottles are reduced, which greatly increases the damage probability of bottles in the process of transportation, high-temperature sterilization, drug filling and storage Therefore, the inspection of internal stress can not only effectively control the quality of bottles, but also be used to supervise and control the annealing process 2 Executive standard GB / t12415 test method for internal stress of medical glass containers 3 Test sample medical infusion bottle (Note: the sample is provided by the customer of Jinan Saicheng) 4 Test equipment "yly-05 digital polarizing stress meter" independently developed by Jinan Saicheng has met and met a number of national and international standards: GB / t4545 Test method for internal stress of glass bottles and cans, GB / t12415 test method for internal stress of medical glass containers, ybb00162003-2015 internal stress measurement method 5.1 test on the bottom of the medical glass bottle (1) remove the sensitive color plate, put one quarter wave plate into the field of view, adjust the zero point of the polarizing stress meter to make it appear dark field of view (2) Put the sample into 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 Zui high stress point, rotate the deflection mirror until the blue gray is replaced by the brown (5) record the rotation angle of the deflection mirror at this time, and measure the thickness of the point 5.2 the test procedure for the wall of medical glass bottle (1) is the same as the above 5.1 (2) Put the sample into the field of view, make the axis of the sample and the plane of polarization 45 o, then there are different areas of light and dark on the side wall (3) Rotate the polarizer until the dark area on the sidewall meets and just completely replaces the bright area (4) Rotate the test object around the axis to determine the large stress area of Zui (5) Record the setting angle of deflection mirror in the large stress area of Zui, and measure the original thickness of both sides of the wall with wbt-g bottle wall thickness tester (record the sum of wall thickness of both sides). 6 Conclusion the "yly-05 digital display polarizing stress meter" developed by Jinan Saicheng adopts a high-precision angle encoder for measurement, the accuracy is better than 2 nm, which is much higher than that of similar products in the market In the process, two test modes, qualitative and quantitative, can be carried out, with real-time display of optical path difference and angle value What's more, the dark field of polarization field can always be at the zero angle point without human proofreading, avoiding the error caused by human factors, so it is an ideal testing instrument for major manufacturers In addition, it should be noted that the test of the wall stress of medical glass bottles needs to be carried out in cooperation with the "wbt-g bottle wall thickness tester" developed by Jinan Saicheng Only when the two are combined can the wall stress value be obtained For more questions about the instruments, please call Jinan Saicheng technology directly Strength makes specialty, specialty makes brand, quality and future The support and trust of thousands of customers are behind the persistence We welcome your call and look forward to sincere cooperation with you!