INTRODUCTION FOR PLASTIC INJECTION MOULDING ESSENTIALS:

Plastic parts are found in countless big and small products today, from computers, household white goods, control and instrumentation equipments, road vehicles, sporting goods to biomedical instruments, just to name a few. The quality and finishing of the plastic products depend on the choice of plastic material, product design, mould design and moulding process.

This is a course of continuing education specifically designed for people who are new to the plastic industry and wishing to gain some fundamental understanding of the plastic injection moulding technology. This course will review the different types of plastic materials before introducing the principles for designing plastic products and moulds.  The course will then continue to discuss the injection moulding process, machinery and moulding parameters.  Common injection moulding defects and problems will also be studied. This course provides an essential understanding of plastic injection moulding technology and how the choice of material, moulding parameters, machine elements, mould design and tooling, and product design affect the finished, moulded parts. The course instructor will draw on his extensive experiences in plastic injection moulding to illustrate the subject  matter with practical examples. Attendees can also bring along samples of moulding defects for diagnosis and discussion.

COURSE OBJECTIVES:

• fundamental understanding of plastic materials
• the terminology needed to effectively communicate in the industry
• essential understanding of product design
• essential understanding of mould design
• overview of injection moulding machines
• injection moulding process and moulding parameters
• injection moulding defects

INTENDED AUDIENCE:

This course is recommended for those who wish to improve their problem solving skills in plastic injection moulding process. It is also highly beneficial to companies aiming to improve productivity and optimise their injection moulding process. A variety of people will benefit from this course. They include:

• product designers
• mould designers
• mould makers
• moulding engineers
• process engineers
• project engineers
• manufacturing engineers
• production engineers
• any technical personnel involved with plastic injection moulded parts

PREREQUISITE :

None

METHODOLOGY:

• This course is conducted in a seminar room
• Interactive and action based with personal examples.
• Combination of short lectures, visual presentations, workshops, demonstrations, simulations and games. More emphasis is placed on workshops to allow the participants to learn the material presented in a fun and easy manner.

DURATION:

2 days

OUTLINE OF WORKSHOP:

Day 1

• Introduction of plastic injection moulding
• Overview of plastic materials
  • Molecular structure
  • Group of plastics
  • Volume versus temperature behavior
  • Semi-crystalline materials
  • Amorphous materials
  • Viscosity
  • PVT diagram
  • Fountain and skin effect
  • Molecular orientation and relaxation
  • Additives
  • Shrinkage

• Product design
  • Wall thickness
  • Corner design
  • Rib design
  • Boss design
  • Gusset
  • Draft angle
  • Undercut

• Moulding process
  • Process cycle
  • Moulding parameters
  • Multi-steps injection
  • Moulding defects and troubleshooting
  • Video Presentation

Day 2

• Injection mould
  • Types of mould
  • Two & three plate mould
  • Sprue and runner
  • Types of gates
  • Gating and moulding defects
  • Venting
  • Cam actions
  • Ejection

• Injection moulding machine
  • Hydraulic system
  • Injection system
  • Clamping system

• Case studies and group discussion

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