E.i. Dupont De Nemours and Company

Duncan Douglas McCabe

Joseph Anthony Perrotto

Melvin H Johnson

Calixto Estrada

James David Hamerslag

Robert W Hooley

Robert Carl Boger

Leland Luper Krauss

John W Hunt

Robert Carter Johnstone

A method and apparatus for spinning filaments of a polymeric material includes a first temperature control arrangement for heating a spin pack to a first predetermined reference temperature greater than the predetermined polymer inlet temperature such that the temperature across a polymer filter holder and the spinneret plate in the spin pack is substantially uniform, whereby the temperature of the filaments emanating from the spinneret plate is substantially uniform. A plate assembly having at least one polymer flow passage therein is disposed between the outlet of the pump and the inlet of the spin pack. A second temperature control arrangement for independently controlling the temperature of the plate assembly to a second predetermined reference temperature is provided. The second predetermined reference temperature is selectable to a temperature above, equal to, or below the predetermined polymer inlet temperature, whereby the temperature of polymer conveyed through the polymer flow passage in the plate assembly is selectably controllable to a predetermined polymer temperature lying within a predetermined range of the second predetermined reference temperature.

Method and spinning apparatus having a multiple-temperature control

A fiber optic device is provided with a feedthrough assembly adapted to decouple deflections imposed on the feedthrough from lensed end of a fiber disposed within the feedthrough assembly.

Decoupled fiber optic feedthrough assembly

Growing community of inventors

Wilmington, DE, United States of America

Duncan Douglas McCabe