Course Duration: 4-5 Day (8 Hour Days)

Course Objectives:

Upon completion of this module the trainee will be able to understand:

• Describe the injection molding cycle

• Understand the injection unit, clamp, and mold

• Describe the injection control

• Understand plastics flow during injection molding

• Define shrinkage and volume changes

• Understand problem-solving

• Describe molding strategies

Course Outline:

A. Overview of the Injection Molding Cycle

1.          The injection unit

2.          The clamp

3.          The mold

B. Injection Control

1.          The feedback loop

2.          Charting pressure and velocity

3.          Utilizing velocity-controlled filling

4.          Pressure limited velocity

C. Plastics Flow During Injection Molding

1.          The worm analogy

2.          Laminar flow and fountain flow

3.          Effects of temperature, pressure, and molecular weight

D. Shrinkage and Volume Changes

1.          Pressure-volume-temperature relationship

2.          Amorphous and semi-crystalline materials

3.          Cavity pressure and mold shrinkage

4.          Flow and temperature effects

5.          Fiber fillers

E. Problem Solving

1.          Quality planning

2.          Troubleshooting common molding defects

F. Molding Strategies

1.          Traditional molding

2.          Two-stage molding

3.          Three-stage molding

4.          Velocity to pressure transfer methods

5.          Process monitoring

6.          Initial mold tryout procedure

 NCTS courses can be customized by content, length of course and format delivery.

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