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WTAP > PLASTIC MOLDING PROCESSES > Flashcards

PLASTIC MOLDING PROCESSES Flashcards

1
Q

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.

A

Plastic Molding Processes

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2
Q

Molten plastic is injected into a mold
cavity, cooled, and solidified into the
desired shape.

A

Injection Molding

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3
Q

Products: Bottle caps, containers,
automotive parts, and toys

A

Injection Molding

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4
Q

A variation of injection molding using
multiple materials to create layered
or hybrid structures in a single part.

A

Co-injection Molding

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5
Q

A variation of injection molding using
multiple materials to create layered
or hybrid structures in a single part.

A

Co-injection Molding

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6
Q

Plastic powder is placed in a rotating
mold and heated to create hollow
parts with uniform thickness.

A

Rotational Molding (Rotomolding)

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7
Q

Products: Storage tanks, kayaks,
playground equipment, and large
hollow containers.

A

Rotational Molding (Rotomolding)

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8
Q

Pre-expanded plastic beads (e.g.,
polystyrene) are heated in a mold,
causing them to expand and fuse.

A

Expandable-Bead Molding

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9
Q

Products: Packaging materials,
insulation panels, and lightweight
protective gear.

A

Expandable-Bead Molding

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10
Q

Plastic is melted and pushed through
a die to create continuous shapes
with uniform cross-sections.

A

Extrusion Molding

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11
Q

Products: Pipes, straws, window
frames, and wire insulation.

A

Extrusion Molding

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12
Q

A process for creating hollow plastic
parts by inflating molten plastic inside
a mold.

A

Blow Molding

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13
Q

Products: Bottles, fuel tanks, and
containers.

A

Blow Molding

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14
Q

Heating plastic sheets until pliable,
then forming them into shapes using
molds and pressure.

A

Thermoforming

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15
Q

Products: Packaging trays,
disposable cups, and clamshell
containers.

A

Thermoforming

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16
Q

Combines plastic with reinforcing
materials (e.g., fiberglass or carbon
fibers) for added strength and
durability.

A

Reinforced Plastic Molding

17
Q

Products: (plastics with fiberglass or carbon fiber ) Aircraft panels, automotive parts, and sports equipment.

A

Reinforced Plastic Molding

18
Q

High-strength parts formed by
compressing plastic under high
pressure in a heated mold.

A

Forged Plastic Parts

19
Q

Products: Gears, industrial machine
parts, and structural components.

A

Forged Plastic Parts

20
Q

Common Process of Plastic Forging designed to eddiciently force the head on a bolt or similar fastener

A

Upsetting

21
Q

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.

A

Powder Metallurgy

22
Q

Processes of Powder Metallurgy (6)

A
  1. Powder Production
  2. Powder Characterization and testing
  3. Mixing and Blending
  4. Compacting
  5. Sintering
  6. Finishing Operations
23
Q

Properties of P/M Products (1-4)

A
  • 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.
24
Q

Properties of P/M Products (5-8)

A
  • 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.
25
Q

EXAMPLES:
1. Automotive parts: Gears, bearings,
pistons, and connecting rods.
2. Industrial components: Cutting tools,
gears, and machine parts.
3. Electronics: Magnetic materials and
components for devices like
transformers.
4. Aerospace: Structural and functional
components with specific material
properties.

Products from powdered metal compacted into shape

A

Powder Metallurgy

WTAP (5 decks)

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