Static-dissipative foam extrusion calibration with minimized expansion loss

摘要

The disclosure relates to a calibrator including a first plate opposing a second plate, the first plate having a first foam-expansion surface adjacent to a first anti-static surface, the second plate having a second foam-expansion surface adjacent to a second anti-static surface, wherein the first foam-expansion surface and the second foam-expansion surface are aligned to form a foam-expansion region, and wherein the first anti-static surface and the second anti-static surface are aligned to form an anti-static region. The disclosure also relates to a method of producing a polyetherimide foam, the method including passing a liquid polymer mixture comprising a polyetherimide through the calibrator.

主权项

1. A calibrator comprising a first plate opposed to a second plate, the first plate comprising:
a first foam-expansion surface adjacent to a first anti-static surface, wherein the first foam-expansion surface comprises an unfilled fluoropolymer, wherein the first anti-static surface comprises a carbon-filled fluoropolymer, wherein the calibrator further comprises a first end proximal to a foam extrusion die and a second end distal to the foam extrusion die, wherein the first foam expansion surface is positioned at the first end and the first anti-static surface is positioned at the second end.