All about Plastic Injection Molding and Thermoplastics [Videos]

Do some of your products include plastic parts? If you purchase hard goods, that’s probably the case.

When writing a guide about plastics manufacturing last month, and I made a list of products that are made in China and incorporate thermoplastics. Here are a few:

• The casing of many electrical appliances and electronic products
• Many vehicle parts (e.g. instrument panels in PVC, a dashboard in ABS, bumpers in PP, cams in PA, buttons in PS…)
• Many construction parts (e.g. countertops, panels, pipes, railings, insulation…)
• Many medical devices (syringes, blood bags, tubes, inhalers…)
• Toys (LEGO, many Mattel figurines, etc.), baby products
• Furniture

Plastic is nearly everywhere! And China makes a large proportion of it. Mold fabrication is particularly inexpensive there, and there is a lot of overcapacity when it comes to injection molding.

Plastic injection molding videos

We made some videos on the plastic injection molding process to help importers understand it better, and I thought I’d share them here.

1. Explanation of the process itself

You will learn about:

• The injection press
• The mold and its components
• Important concepts: daft angle and parting line
• How clamping works – toggle vs. hydraulic clamping
• How the polymer is pushed into the mold (details about the screw mechanism, with a cool animation)
• For more in-depth explanations on the way gates work, you can watch another video

2. The most common thermoplastics used

We cover the most common thermoplastics and their properties:

• ABS
• POM
• Nylon
• PC
• PP
• PBT
• PMMA
• How to select the right polymer for your application?

3. The most common injection molding defects, and how to prevent them

We cover the following typical defects:

• Sink marks
• Weld lines
• Short shots
• Burn marks
• Flash
• Flow lines
• Warping
• Parts sticking inside the mold

4. How to check whether the process is performed correctly

When a client needs extra assurance that all will turn out well, we do some of these:

• Checking the tool design
• Checking the setup of the press
• What equipment is needed for these inspections?
• First off inspection
• Process audit: what to look at when qualifying a potential supplier or when ensuring a current supplier has the right process setup and controls in place

I hope this is useful. We’ll do similar ‘deep dives’ into other processes and/or materials in other articles, over the next few months.

Please add any questions you may have about plastic injection molding or other manufacturing processes as comments here and I’ll be glad to answer them.

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