PLASTIC MOLDING PROCESSES Flashcards
involve shaping plastic materials into desired forms using molds or dies
under controlled heat, pressure, or chemical reactions. These processes are used in various industries to produce diverse plastic products.
Plastic Molding Processes
Molten plastic is injected into a mold
cavity, cooled, and solidified into the
desired shape.
Injection Molding
Products: Bottle caps, containers,
automotive parts, and toys
Injection Molding
A variation of injection molding using
multiple materials to create layered
or hybrid structures in a single part.
Co-injection Molding
A variation of injection molding using
multiple materials to create layered
or hybrid structures in a single part.
Co-injection Molding
Plastic powder is placed in a rotating
mold and heated to create hollow
parts with uniform thickness.
Rotational Molding (Rotomolding)
Products: Storage tanks, kayaks,
playground equipment, and large
hollow containers.
Rotational Molding (Rotomolding)
Pre-expanded plastic beads (e.g.,
polystyrene) are heated in a mold,
causing them to expand and fuse.
Expandable-Bead Molding
Products: Packaging materials,
insulation panels, and lightweight
protective gear.
Expandable-Bead Molding
Plastic is melted and pushed through
a die to create continuous shapes
with uniform cross-sections.
Extrusion Molding
Products: Pipes, straws, window
frames, and wire insulation.
Extrusion Molding
A process for creating hollow plastic
parts by inflating molten plastic inside
a mold.
Blow Molding
Products: Bottles, fuel tanks, and
containers.
Blow Molding
Heating plastic sheets until pliable,
then forming them into shapes using
molds and pressure.
Thermoforming
Products: Packaging trays,
disposable cups, and clamshell
containers.
Thermoforming
Combines plastic with reinforcing
materials (e.g., fiberglass or carbon
fibers) for added strength and
durability.
Reinforced Plastic Molding
Products: (plastics with fiberglass or carbon fiber ) Aircraft panels, automotive parts, and sports equipment.
Reinforced Plastic Molding
High-strength parts formed by
compressing plastic under high
pressure in a heated mold.
Forged Plastic Parts
Products: Gears, industrial machine
parts, and structural components.
Forged Plastic Parts
Common Process of Plastic Forging designed to eddiciently force the head on a bolt or similar fastener
Upsetting
Involves producing metal parts
from powdered metals. The metal powders are compacted into a desired shape and then heated (sintered) to bond the particles together, forming a solid part without the need for melting.
Powder Metallurgy
Processes of Powder Metallurgy (6)
- Powder Production
- Powder Characterization and testing
- Mixing and Blending
- Compacting
- Sintering
- Finishing Operations
Properties of P/M Products (1-4)
- Porosity: Controlled porosity for specific
functions. - Dimensional Accuracy: High precision
with minimal machining needed. - Material Utilization: Little waste, with
recyclable powders. - Controlled Microstructure: Tailored
properties like grain size.
Properties of P/M Products (5-8)
- Strength: High strength, especially with
proper compaction and sintering. - Complex Shapes: Capable of making
intricate parts. - Good Surface Finish: Typically requires
minimal post-processing. - Tailored Properties: Customizable
properties like hardness and wear
resistance.
