Injection vs. Thermoforming

The fundamental difference between these two containers lies in their birth. Injection molding forces molten plastic resin into a closed steel mold under high pressure. This process yields a strong, rigid part with sharp details, ideal for complex shapes like divided trays or hinged lids.

In contrast, thermoforming (vacuum forming) starts with a pre-extruded plastic sheet. This sheet is heated until soft, then sucked down over a single-sided mold. This method creates lighter, thinner-walled containers. While less structural, thermoforming allows for rapid production and easy stacking. For takeaway or fresh produce, thermoforming is cost-effective; for durable, microwavable containers requiring a premium feel, injection molding is superior.