Alkali Resistant Pharmaceutical Neutral Glass Tube 99.95% Purity

Acid And Alkali Resistance Neutral Glass Tube

The size and distribution of the permanent stress caused by the thermal process in each part of the product will not be uniform, therefore, it will affect the strength of the glass product, and even break by itself due to stress concentration. Annealing can eliminate harmful tension inside the glass and prevent new stress from being generated. During annealing, heat the glass product or keep it to the annealing temperature after thermoforming, so that the original stress is relaxed and eliminated, and then slowly cooled to below the strain temperature. After the glass has completely entered the state of rigid body, the temperature difference between the inner and outer layers only produces temporary stress .

1. Rotation speed: In the process of centrifugal pipe expansion, the rotation speed and pipe diameter determine the centrifugal force. When the pipe diameter must be, the higher the rotation, the greater the centrifugal force. Under the action of centrifugal force, the larger the pipe diameter, the slower the rotation speed. Therefore, the speed used in the pipe expansion process should be based on the diameter of the glass tube
2. The wall thickness and the corresponding temperature are determined. In the process of electrothermal softening and air-pressure pipe expansion, the control of pipe diameter mainly relies on a set of sizing devices that rotate synchronously with the glass tube, which has a wider range of speed requirements.