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Automated large outer diameter preform tipping process and resulting glass preform

A glass preform and preform technology, applied in glass manufacturing equipment, manufacturing tools, glass production, etc., can solve problems such as troubled metal wires

Active Publication Date: 2022-07-08
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 outer diameter preform tipping process and resulting glass preform
  • Automated large outer diameter preform tipping process and resulting glass preform
  • Automated large outer diameter preform tipping process and resulting glass preform

Examples

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

[0061] FEM (Finite Element Modeling) is used to form a process recipe via simulation that combines the movement of the cylinder with the heating rate of the oven to avoid thermal shock to the cylinder and to collapse the cylinder 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 is identified as standard procedure to preheat the top of the cladding 32 and initiate collapse of the interface between the cladding 32 and the mandrel 30 (ie, closing the gap 31 of the glass body 20). These four plots are snapshots of four typical moments in the simulation, which only attempt to show the warm-up phase (A-B), the dwell time in the center of the heater, and the progressive upward c...

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Abstract

An automated tipping process for large outer diameter preforms. The regions of the preform are heated and softened in a furnace. Shape the preform tip and control the process by moving the glass above and below the heating zone and by sensing the weight of the lower part of the preform, which is actually the viscosity of the softened material metric. After reaching the correct viscosity, the bottom holder is moved away from the top holder according to a nonlinear acceleration rate profile (derived from FEM simulation of glass flow) that is precisely programmed and controlled such that the preform tip Optimally shaped (usually with short and sharp tips) with minimal waste and waveguide distortion when drawn into fibers. The same concept of the non-linear acceleration rate 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 fabricate these with excellent tip geometry and shape, reduced glass waste, and minimal cladding-core waveguide distortion class component. Background technique [0002] As in US Patent Application Publication No. 2018 / 0145752, titled "Upward Collapse Process and Apparatus for Making GlassPreforms" and by the assignees of the present application, Heraeus Tenevo LLC and Heraeus Quarzglas GmbH and Co. KG, filed on November 15, 2017 Disclosed, the field of applied science and engineering related to the design and application 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 two ends of a fiber and are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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