3D Product Materials and Finishing 2 — Questions and Answers
Question 1: What is 'powder coating' and what advantages does it offer over liquid spray painting for metal products?
- Electrostatically applied dry powder cured by heat, offering superior durability, uniform thickness, and no solvent emissions (Correct answer)
- A coating applied with a powder brush for decorative effects
- A zinc-based rust prevention treatment
- A ceramic coating for high-temperature parts
Correct answer: Electrostatically applied dry powder cured by heat, offering superior durability, uniform thickness, and no solvent emissions
Powder coating applies charged dry powder particles to grounded metal parts, then oven-cures them into a uniform, tough finish with better chip resistance than wet paint.
Question 2: What is 'die casting' and which metals are most commonly used in this product manufacturing process?
- Forcing molten metal into a steel die under high pressure; most commonly using zinc, aluminum, and magnesium alloys (Correct answer)
- Cutting parts from solid metal billets in a CNC machine
- Casting molten metal into sand molds
- Stamping flat metal sheets in a press die
Correct answer: Forcing molten metal into a steel die under high pressure; most commonly using zinc, aluminum, and magnesium alloys
Die casting injects molten metal under high pressure into hardened steel molds, producing high-volume, dimensionally consistent metal parts with thin walls.
Question 3: What does 'UL 94' rating indicate on a plastic product material datasheet?
- The flammability classification of the plastic material — how it behaves when exposed to a flame (Correct answer)
- The UV resistance level of the material
- The tensile strength in megapascals
- The recycled content percentage
Correct answer: The flammability classification of the plastic material — how it behaves when exposed to a flame
UL 94 ratings (V-0, V-1, V-2, HB) classify how quickly a plastic material self-extinguishes after exposure to a direct flame — critical for electronics enclosures and electrical products.
Question 4: What is 'texture' in the context of injection molded plastic product surfaces, and how is it specified?
- A surface pattern applied to the mold steel via etching or EDM, specified by SPI or Mold-Tech standards (Correct answer)
- A bump map applied digitally in a rendering engine
- A sandpaper grit applied after molding
- A paint technique for decorative effects
Correct answer: A surface pattern applied to the mold steel via etching or EDM, specified by SPI or Mold-Tech standards
Mold texture is physically etched into the mold steel and replicates onto every molded part — standardized grades (like Mold-Tech MT-11020) ensure consistent results across manufacturers.
Question 5: What is 'ABS+PC blend' commonly used for in consumer electronics product housings?
- Combining ABS's processability and color range with PC's impact resistance and heat stability (Correct answer)
- Creating a biodegradable housing material
- Producing optically clear transparent parts
- Making ultra-flexible, rubberized enclosures
Correct answer: Combining ABS's processability and color range with PC's impact resistance and heat stability
ABS/PC blends balance ABS's easy molding and wide color selection with polycarbonate's superior impact strength and thermal performance, making them ideal for laptop and phone housings.
Question 6: What is 'electroplating' in product design finishing?
- Depositing a thin metal layer (chrome, nickel, gold) onto a substrate using electrolysis for appearance or function (Correct answer)
- Painting products with metallic flake paints
- A vacuum deposition coating process for mirrors
- Applying carbon fiber weave to plastic parts
Correct answer: Depositing a thin metal layer (chrome, nickel, gold) onto a substrate using electrolysis for appearance or function
Electroplating uses electrical current to deposit a thin, adherent metal layer onto a conductive substrate, adding corrosion resistance, conductivity, or decorative metallic appearance.
3D Product Materials and Finishing 2
What is 'powder coating' and what advantages does it offer over liquid spray painting for metal products?