METHOD AND DEVICE FOR THE HEAT SEALING OF GLASS TUBES

摘要

In a method for the heat sealing of glass tubes (2) the glass tube (2) is softened at a separating point adjacent to an end section (3) of said glass tube and the glass tube is rotated around the longitudinal axis thereof and heated in this manner until a heat softened state is reached in which the end section (3) is separated. According to the invention , the heat -softened end section of the glass tube is pulled away from the separating point by means of a pull off device (11) , which is preferably non -rotatably mounted , in such a way that the glass tube (2) is simultaneously heat sealed at the separating point during the separating process. Because of the rotation of the tube (2) on the conveyor belt simple linear softening burners (9) can be used beneath the tubes (2) in place of ring burners. Superimposing the rotation of the tube (2) with the preferably stationary fixed end section (3) of the glass tube results in a more uniform necking of the end section (3) and thus a more homogeneous seal. In particular , the process parameters for the necking and heat sealing of the glass tube ends can be flexibly specified in a simple manner according to the invention.