A resin coating device for coating a surface of a glass fiber, includes: a point having a point hole; a die disposed directly below the point and including a first alignment portion, a second alignment portion, and a first die hole; and a first resin supply path. The second alignment portion is disposed below the first alignment portion. The first alignment portion includes a first diameter-reduced portion, and a first land portion disposed, connected to the first diameter-reduced portion, and having a constant diameter in the traveling direction. The second alignment portion includes a second diameter-reduced portion, and a second land portion, connected to the second diameter-reduced portion, and having a constant diameter in the traveling direction. The first diameter-reduced portion, the first land portion, the second diameter-reduced portion, and the second land portion are each a part of the first die hole.

A resin coating device for coating a surface of a glass fiber, includes: a point having a point hole; a die disposed directly below the point and including a first alignment portion, a second alignment portion, and a first die hole; and a first resin supply path. The second alignment portion is disposed below the first alignment portion. The first alignment portion includes a first diameter-reduced portion, and a first land portion disposed, connected to the first diameter-reduced portion, and having a constant diameter in the traveling direction. The second alignment portion includes a second diameter-reduced portion, and a second land portion, connected to the second diameter-reduced portion, and having a constant diameter in the traveling direction. The first diameter-reduced portion, the first land portion, the second diameter-reduced portion, and the second land portion are each a part of the first die hole.

An optical fiber coating die assembly is provided. The optical fiber coating die assembly includes a housing defining a guide chamber having an inlet for receiving optical fiber and an outlet, a guide die located at the outlet of the guide chamber, and a sizing die. The optical fiber coating die assembly also includes a coating applicator disposed between the guide die and the sizing die, and a tube operatively coupled to the inlet of the guide chamber and axially aligned with the chamber to receive the optical fiber fed into the guide chamber and provide a barrier to air flow.

An optical fiber coating die assembly is provided. The optical fiber coating die assembly includes a housing defining a guide chamber having an inlet for receiving optical fiber and an outlet, a guide die located at the outlet of the guide chamber, and a sizing die. The optical fiber coating die assembly also includes a coating applicator disposed between the guide die and the sizing die, and a tube operatively coupled to the inlet of the guide chamber and axially aligned with the chamber to receive the optical fiber fed into the guide chamber and provide a barrier to air flow.

Coated optical fibers and uses of such fibers as sensors in high temperature and/or high pressure environments. The coated optical fiber has improved sensing properties at elevated pressure and/or temperature, such as enhanced acoustic sensitivity and/or a reduced loss in acoustic sensitivity. The use of the coated optical fibers in various sensing applications that require operation under elevated pressure and/or temperature, such as, acoustic sensors for various geological, security, military, aerospace, marine, and oil and gas applications are also provided.

Herein is described a process for drying wet glass fibre forming packages, the process comprising: providing a wet glass fibre forming package comprising a strand of glass fibres with an aqueous sizing applied to the glass fibres; and subjecting the wet glass fibre forming package to microwave radiation having a frequency in the range of about 750 to about 1050 MHz.

A method of preparing a flame retardant grafted polyolefin resin is provided. The method includes a step of reacting in an extrusion barrel a reactive polyolefin and a monomeric flame retardant agent to form the flame retardant grafted polyolefin resin. The reactive polyolefin has a functional group including a moiety selected from the group consisting of anhydrides, epoxies, carboxylic acids, ketones, and isocyanates. The monomeric flame retardant agent has an amine functional group. The method also includes a step of extruding the flame retardant grafted polyolefin resin. Also provided is a flame retardant grafted polyolefin resin that can be made according to the method. Further provided is a flame retardant cable that incorporates can incorporate the flame retardant grafted polyolefin resin.

Coated optical fibers and uses of such fibers as sensors in high temperature and/or high pressure environments. The coated optical fiber has improved sensing properties at elevated pressure and/or temperature, such as enhanced acoustic sensitivity and/or a reduced loss in acoustic sensitivity. The use of the coated optical fibers in various sensing applications that require operation under elevated pressure and/or temperature, such as, acoustic sensors for various geological, security, military, aerospace, marine, and oil and gas applications are also provided.

Coated optical fibers and uses of such fibers as sensors in high temperature and/or high pressure environments. The coated optical fiber has improved sensing properties at elevated pressure and/or temperature, such as enhanced acoustic sensitivity and/or a reduced loss in acoustic sensitivity. The use of the coated optical fibers in various sensing applications that require operation under elevated pressure and/or temperature, such as, acoustic sensors for various geological, security, military, aerospace, marine, and oil and gas applications are also provided.

Provided herein is a method of and system for processing an optical fiber. The method includes the steps of drawing an optical fiber in a drawing direction along a process pathway through a coating chamber comprising an inlet and an outlet, and a coating liquid volume to coat the optical fiber; supplying the coating liquid through the inlet, the coating liquid exiting the coating chamber through the outlet; and recirculating to coating liquid exiting the coating chamber to the inlet.