Process for producing a glass bulb provided with a pump tube or pump tube fitting

摘要

In a process for producing a glass bulb (8, 9) provided with a pump tube or pump tube fitting, for cylindrical lamps, in which a glass tube (1) with a length intended for two bulbs is heated in the centre and drawn out to form a constriction (7), a gas jet (12) with a diameter corresponding to the desired internal diameter of the constriction being blown in during the drawing out process, according to the invention the gas jet (12) blown in at one side of the constriction (7) is sucked out at the other side thereof. <IMAGE>