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Automated large outside diameter preform tipping process and obtained glass preform

A technology of glass prefabrication and prefabrication, which is applied in the direction of glass manufacturing equipment, manufacturing tools, glass production, etc., and can solve problems such as troubled metal wires

Active Publication Date: 2020-07-21
HERAEUS QUARTZ NORTH AMERICA LLC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Plus, the fiber is also less susceptible to electromagnetic interference, a problem that plagues wire

Method used

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  • Automated large outside diameter preform tipping process and obtained glass preform
  • Automated large outside diameter preform tipping process and obtained glass preform
  • Automated large outside diameter preform tipping process and obtained glass preform

Examples

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[0060] The following examples are included to more clearly demonstrate the overall nature of the invention. These examples are illustrative of the present invention and do not limit the present invention.

[0061] FEM (Finite Element Modeling) is used to form a process recipe via simulation that combines the motion of the cylinder with the heating rate of the oven to avoid thermal shock to the cylinder and to allow the cylinder to collapse at the right time The temperature required for shrinkage ends. With these simulations, such as Figure 3A , Figure 3B , Figure 3C and Figure 3D As shown, the recipe was identified as a standard procedure to preheat the top of the cladding 32 and initiate the collapse of the interface between the cladding 32 and mandrel 30 (ie, closing the gap 31 of the glass body 20). These four graphs are snapshots of four typical moments in the simulation, only attempting to show the warm-up phase (A-B), dwell time at the heater center, and the upw...

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Abstract

An automated large outside diameter preform tipping process. A zone of the preform is heated inside a furnace and softened. The preform tip is shaped and the process is controlled by the movement of the glass above and below the heating zone and by sensing the weight of the lower part of the preform, which in effect is a measure of the viscosity of the softened material. Once the correct viscosityis reached, the bottom holder is moved away from the top holder with a non-linear, accelerated velocity profile (derived from the FEM simulation of glass flow) which is precisely programmed and controlled so that the preform tip is optimally shaped (usually short and sharp tipped) with minimum waste and waveguide distortion when drawn into a fiber. The same concept of the non-linear, acceleratedvelocity profile can also be applied to other tipping processes such as horizontal preform tipping processes.

Description

technical field [0001] The present application relates generally to the production of elongated glass components, and more particularly to the use of a process to manufacture such components with excellent tip geometry and shape, reduced glass waste, and minimal cladding-core waveguide distortion. class widget. Background technique [0002] As in U.S. Patent Application Publication No. 2018 / 0145752 entitled "Upward Collapse Process and Apparatus for Making Glass Preforms" and filed on November 15, 2017 by Heraeus Tenevo LLC and Heraeus Quarzglas GmbH and Co. KG, the assignees of this application The field of applied science and engineering that discloses the design and use of optical fibers is known as fiber optics. Optical fibers are flexible, transparent fibers made by drawing glass (silicon dioxide) down to a diameter slightly thicker than the diameter of a human hair. Optical fibers are most commonly used to transmit light between the two ends of a fiber and are widely...

Claims

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Application Information

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IPC IPC(8): C03B37/014
CPCC03B37/01446C03B37/01466C03B37/01251C03B37/0126C03B37/01245C03B23/0473C03B37/01225C03B37/07C03B2205/14C03B37/01257
Inventor 马秋林章凯慧
Owner HERAEUS QUARTZ NORTH AMERICA LLC
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