58 results about "Flame polishing" patented technology

A method for manufacturing an optical fiber preform includes a process A of applying flame polishing to a center glass rod, a process B of determining a ratio ra / rb, which is a ratio of a radius ra of the center glass rod expressed in millimeters with respect to a radius rb of a target optical fiber preform expressed in millimeters, based on a refractive index profile of a target optical fiber preform, and a process C of determining an amount of fine glass particles to be deposited on the center glass rod so that a ratio ra / rb / c falls within a range from 0.002 to 0.01, where 'c' is a maximum value of hydroxyl group concentration expressed in ppm in the vicinity of a boundary between the center glass rod and an outer layer, which is formed by depositing fine glass particles on the center rod and by being vitrified.

A method for producing a single-mode fiber for submarine cables including washing and flame polishing of a preform, fiber drawing, coating with a first coating layer and curing therein using an UV-curing device, coating with a second coating layer and curing therein using the UV-curing device, fiber selection with a 2% screening strain, and testing the properties of the fiber. The fiber has a high strength and long coiling length exceeding 100 km and the method is easy to practice with low production cost and parameters involved therein are highly controllable.

The invention relates to the technical field of glass processing, and especially relates to a glass container fire polishing machine, which solves technical problems in prior arts such as unreasonable design. The fire polishing machine comprises a frame, and a glass container conveyer belt arranged above the frame. The fire polishing machine is characterized in that: plural sets of fire polishing mechanism are arranged on the frame, wherein the fire polishing mechanisms are orderly arranged along the conveyer belt; each fire polishing mechanism is connected to the frame through an adjustable movable mechanism; the fire polishing mechanisms can move along the conveyer belt with the driving of the adjustable movable mechanism; while moving along the conveyer belt, the fire polishing mechanisms can be elevated in a vertical direction with the adjustable movable mechanism. Compared to prior arts, the glass container fire polishing machine has advantages of reasonable design, simple structure, high heat treatment temperature, and high speed. Meanwhile, flaws appeared during glass bottle production processes can also be solved by the machine. The processed glass containers have good surface fineness, no dust, and basically no pollution.

An optical fiber base material machining method for forming spindle-shaped portions at ends of the optical fiber base material by severing the optical fiber base material after reducing an outer diameter of the optical fiber base material to a predetermined target outer diameter at a predetermined machining position, comprising: reducing the outer diameter to a predetermined intermediate outer diameter between the outer diameter before the machining and the target outer diameter at the machining position; flame polishing a surface of the optical fiber base material in a region including the machining position; and further reducing the outer diameter of the optical fiber base material.

The invention relates to a preparation method of silica optical fiber, in particular to a preparation method of high-strength silica optical fiber, which is used to solve the disadvantage that the strength of the existing silica optical fiber cannot meet the requirements of special application occasions. The preparation method of the high-strength silica optical fiber comprises the following steps: firstly, mechanically polishing a quartz preform with a diameter of 20-35 mm, the roughness after polishing is 6-8 μm, and then performing flame polishing, and the roughness after polishing is 4-6 μm , and then gradually reduce the heating temperature by gradually reducing the flow rate of hydrogen in the oxyhydrogen flame. After stopping the heating, let the quartz preform stand at room temperature, pickle the quartz preform and then draw it. The drawing speed is 3-10m / min , while annealing the bare optical fiber output from the exit of the drawing furnace, the length of the annealing section is 600mm, the annealing temperature is 300-500°C, and finally the bare optical fiber is coated.