Choosing the right way to process polymers is one of the most important decisions you’ll make when developing a plastic product. While injection molding is the method most people think of, it’s far from the only option, and in many cases, it isn’t the best choice or even possible.
In this episode of China Manufacturing Decoded, Adrian and Sofeast’s Head of New Product Development, Paul Adams, explore six major polymer processing methods: injection molding, extrusion, blow molding, thermoforming, rotational molding, and even 3D printing. They explain what each process involves, the kinds of parts it’s best suited for, and how geometry, material choice, cost, and production volume all affect your decision.
If you’re planning to bring a plastic product to market, this discussion will give you the insight you need to match the right process to your design and avoid costly missteps.
Listen here
Listen to the episode or watch on YouTube
Show sections
00:00 – Introduction: Adrian & Paul set up the discussion
01:05 – Why process choice matters: geometry, cost, and performance
04:55 – Injection molding: strengths, limitations, and common products
10:29 – Extrusion: pipes, profiles, and aligned mechanical properties
14:23 – Blow molding: bottles, containers, and even stadium seats
21:23 – Thermoforming: clamshell packaging, tubs, and refrigerator liners
25:30 – Rotational molding: playground equipment, cones, and kayaks
30:34 – Additive manufacturing (3D printing): filaments and prototypes
34:52 – Wrapping up: how to decide and next steps with your manufacturer
Further reading and listening
- Plastic Injection Molding Questions: 17 FAQs Businesses Need Answers To
- This is the third podcast in a trilogy. Listen to the other two here: When To Sign Off On Injection Mold Tooling? Inside the Journey from DFM to T0→T2 and Plastic Playbook: Choosing The Right Polymer
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