Page 121 - Module DMV20173
P. 121
6.0 POLYMER PROCESSING
4. Molten plastic is then forced through the die opening and around the mandrel to
produce a hollow workpiece.
Figure 6.6 Thermoplastic materials are heated in a barrel of an extruder.
.3.2 WORK PIECE GEOMETRY
1. Granular compounds and pellets are used in extrusion molding.
2. Scrap parts may be chopped and mixed with virgin materials.
3. Generally, only thermoplastic materials are extruded.
4. Typical profile extrusions are pipe, film or sheet, rain gutter components, and windows
components (Figure 6.7).
Figure 6.7. Typical profile extrusion.
BPLK 153 DME 1083
