APPARATUS AND METHODS OF MAKING A GLASS TUBE BY DRAWING MOLTEN GLASS

摘要

Method and apparatus for making a glass tube 205 comprising the step of flowing molten glass 121 into a trough 201 such that the molten glass includes a free surface 614 within the trough, wherein a portion of the molten glass with a corresponding portion of the free surface overflows an endless weir 613 to form a molten glass tube 205 flowing down a cylindrical surface 603. The glass tube making apparatus comprises an endless weir 613 configured such that a free surface 614 of molten glass 121 within a trough 201 may overflow the endless weir 613 to form a molten glass tube 205 flowing down a cylindrical surface 603.