Rod Draw System

The Rod Draw System is used to elongate or stretch glass preforms resulting in a decrease in diameter and an increase in length. It’s primary purpose will be to elongate core preforms which can be cut into multiple core rods for the deposition of additional cladding using ASI/Silica Machinery LLC’s OVD overcladding system.

It may also be used to elongate and smooth fully cladded preforms, if desired. In this case, the resulting elongated preform is then drawn into single-mode optical fiber (or cut into multiple preforms before drawing).

The systems are comprised of four main parts, a main structure, a furnace, an elongation pulling system, and a process control subsystem.


The structure is similar in design and materials as the ASI/Silica Machinery LLC CAV90 Sintering System, with additional height.


Furnaces are used in the elongation machine systems. The furnace diameter is 200mm with an adjustable aperture to handle different input preform diameters.


The pulling system is designed to enable each core rod to be cut from the mother core preform during the processing reducing the overall height requirement of the system.

Elongation recipes are created and managed with the process control subsystem. Virtually all process parameters can be ramped including gas flows, furnace temperature, and rod drawing rate. The software is graphical in nature and easy to use. Process run data is also collected and is available for later analysis.

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