Analysis of the test method for the internal stress of glass ampoules

Why to test the internal stress of glass ampoules? Some internal stresses are inevitable in the production of glass ampoules When the internal stresses are concentrated to a certain extent, the glass ampoules will be easily broken by the external influence Therefore, it is necessary to use professional testing instruments to test the internal stress of glass ampoules This paper mainly introduces the test method of measuring the internal stress of glass ampoules with the polarizing stress instrument of Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd Testing equipment: the polarizing stress meter yly-03 produced by Jinan Sanquan Zhongshi Experimental Instrument Co., Ltd can be used to test the internal stress of glass ampoules, together with the glass bottle wall thickness meter chy-b, and the optical path difference of the style ampoules can be directly obtained The internal stress tester and polarizing stress tester of glass ampoule bottle shall meet the following technical requirements: 1 When observing with polarizing elements and protective parts, the brightness of light field edge shall not be less than 120 CD / m2 2 The polarization element used shall ensure that the degree of polarization at any point in the bright field is not less than 99% 3 The polarization field shall not be less than 85mm 4 A 565nm full wave plate (sensitive color plate) and a quarter wave plate can be respectively placed between the polarizing mirror and the polarizing mirror The slow axis of the wave plate is 90 ° to the polarization plane of the polarizing mirror 5 The polarizing mirror shall be installed with a measuring device that can rotate relative to the polarizing mirror and the full wave plate or one quarter wave plate, and has a rotation angle (the dial value is 1 °) Analysis of internal stress test method of glass ampoule 1 Observe with full wave plate, the bottle body appears blue stripe, that is, the point with larger stress (hereinafter referred to as the test point), remember this position; convert it into 1 / 4 wave plate for observation 2 After changing to 1 / 4 wave plate, adjust the deflection mirror to rotate slightly anticlockwise, observe the dark stripes on both sides of the bottle body test point, and stop rotating 3 Then rotate the deflector clockwise At this time, the two dark stripes will move towards the middle until the test point is covered The test point will become Zui dark At this time, the value on the instrument is the optical path difference of the sample! The above is the analysis of the internal stress test method of Sanquan Zhongshi for glass ampoule bottle If you test the internal stress of glass ampoule bottle with this method, once you find that the internal stress value of the bottle is too large, you should adjust the production process in time and take effective methods to eliminate or reduce the stress.