Page 84 - Engineering Plastics Handbook

58 Introduction

Overmolding
Structural foam molding
In-mold assembly (IMA) injection molding
Reaction injection molding (RIM), structural reaction injection molding
(SRIM)
■ Compression molding
■ Resin transfer molding (RTM)
■ Blow molding
Extrusion blow molding
Injection blow molding
Stretch blow molding
■ Extrusion—pipe, profiles, tubes, rods
Extrusion—sheet and film
Coextrusion
Extrusion—blown film
Extrusion—foam
■ Thermoforming; vacuum forming, pressure forming
■ Other processes
Pultrusion
Filament winding
Hand layup
Spinning
Casting
Calendering
■ Assembly, decorating, finishing
■ Coating
Powder coating
Spray coating, electrospray coating
Dip coating
Fluidized-bed coating
Emulsion, dispersion, suspension coating

Rheology [1]
Rheology is the science of flow and deformation of a fluid. It is a function
of load (force) and time. Understanding rheology during melt processing
engineering thermoplastics is fundamental for maximum product quality
and process economics. Viscoelastic rheology is primarily observed by melt
behavior changes as a function of time, temperature, pressure, and vis-
cosity. A resin or compound rheology is influenced by processing parame-
ters, machinery, and equipment design. Melt rheology is probably the