RADIANT DE INCALZIRE BICONIC PENTRU PRODUCEREA FIRELOR

摘要

A heater for use in the manufacture of spun plastics filaments which comprises two portions each having a truncated right polygonal pyramidal or truncated right conical internal surface that is open ended, the internal surface of one of the portions is heated while the internal surface of the other portion is thermally reflective and at the smaller end of the heated portion a screen is arranged to reduce the effective area of the said smaller opening. With the use of the heater spun filaments can be produced having a low degree of preorientation and a satisfactory uniformity.