| 摘要 |
PURPOSE: To make it possible to inexpensively produce a splice by applying fluid of a pressure higher than an ambient pressure on a hollow cylindrical member which is formed of glass and has a hole along the axial line of a longitudinal direction, heating a part of the member to the softening point of the glass to form a bubble in the member and cutting the member in the position of the bubble. CONSTITUTION: The hollow glass cylindrical member 10 is provided with the pore or hole 12 in the longitudinal direction along the axial line in its longitudinal direction and the fluid is applied thereon, by which the member is pressurized. The cylindrical member 10 is so rotated as shown by an arrow 18 around the axial line in its longitudinal direction and a part thereof IS locally heated by a burner 20 and flame 22 up to the softening point of the glass of the cylindrical member 10. Consequently, the inside wall of the pore or the hole 12 is expanded within the region softened by the fluid pressure in the pore or the hole and the bubble 26 is formed in the hollow cylindrical member 10. The member 10 is, thereafter, cut at the point of the bubble 26 and the splice 34 is formed. As a result, the splice is inexpensively produced. |
