Lecture 09 - Sheet and Films, Foams, Fiber and Filaments

Flashcards from Lecture 9 on Sheets and Films, Foams, and Fibers/Filaments.

Film

Material with thickness below 0.7 mm, used for packaging, grocery bags, and wrapping.

Sheet

Material with thickness from 0.5 mm to 12.5 mm, used for flat window glazing, thermoforming.

Calendering

Process involving passing feedstock through rolls to reduce thickness; noted for good surface finish and high gage accuracy.

Slit-Die Extrusion

Production of sheet/film by conventional extrusion using a narrow slit as the die opening.

Blown-Film Extrusion

Process combines extrusion and blowing to produce a tube of thin film.

Polymer Foam

A polymer-and-gas mixture with a porous or cellular structure.

Fiber

A long, thin strand whose length is at least 100 times its cross section.

Filament

A fiber of continuous length.

Spinneret

Die with multiple small holes, used for spinning synthetic fibers.

Melt Spinning

Spinning process where polymer is heated to molten state and pumped through spinneret.

Dry Spinning

Spinning process where polymer is in solution and solvent is separated by evaporation.

Wet Spinning

Spinning process where polymer is in solution and extrudate is passed through a liquid chemical to coagulate the polymer.