Plastic Injection Molding

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Plastic Injection Molding Interview Questions and Answers

Updated 30 May 2022

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Q1. What was the minimum draft required for plastic part

Ans.

The minimum draft required for a plastic part depends on the material, geometry, and surface finish.

  • Draft is the angle or taper added to the vertical walls of a plastic part to facilitate its ejection from the mold.

  • The minimum draft angle is typically 1-2 degrees for thermoplastics and 2-5 degrees for thermosets.

  • The draft angle should be increased for larger parts, deeper cavities, and higher surface finishes.

  • The draft angle may also vary depending on the location of the part...read more

Q2. What is praoblem occur during proceesing

Ans.

Common problems during plastic injection molding process

  • Incomplete filling of the mold

  • Warping or distortion of the molded part

  • Flash or excess material around the parting line

  • Sink marks or depressions on the surface

  • Short shots or incomplete parts

  • Bubbles or voids in the molded part

Q3. What are the problem coming during trails

Ans.

Problems during plastic injection molding trials

  • Material flow issues

  • Warpage or shrinkage

  • Surface defects

  • Injection pressure or temperature problems

  • Mold design or tooling issues

  • Machine malfunction or operator error

Q4. Types of plastic material

Ans.

There are various types of plastic materials used in injection molding, including thermoplastics, thermosets, and elastomers.

  • Thermoplastics can be melted and re-melted, making them easy to mold and recycle. Examples include polyethylene, polypropylene, and polystyrene.

  • Thermosets cannot be melted and re-molded, making them more durable and heat-resistant. Examples include epoxy and phenolic resins.

  • Elastomers are rubber-like materials that can stretch and return to their origin...read more

Plastic Injection Molding Jobs

UGNX , Plastic Injection Molding || Bangalore 3-8 years
Onward Technologies
3.1
₹ 3 L/yr - ₹ 7 L/yr
Bangalore / Bengaluru
Line Inspector / Final Inspector (Plastic Injection Molding) 2-4 years
G Plast
3.7
Coimbatore
Plant Head - Plastic Injection Molding 20-27 years
SV Management Consultants
0.0
Indore
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