Thermoformed Molded Fiber Packaging

The thermoformed (wet-press) molded fiber process

Thermoformed molded fiber - also called wet-press or press-dried fiber - is the process that turned molded fiber from an egg-carton material into a specification-grade packaging substrate. The difference from traditional transfer molding is in the drying: instead of drying the formed part on a screen and then pressing it, the part is pressed hot between matched dies while still wet, which sets a much denser, smoother, more dimensionally stable wall.

What the process gives a buyer:

• Smooth surfaces on both faces - no screen mesh pattern, so the part can be printed, embossed or left clean.
• Thin, rigid walls - approximately 1 mm walls with stiffness approaching a thermoformed plastic tray, while remaining paper.
• Repeatable dimensions - the pressed die defines the part, so cavity-to-product fits stay consistent run to run.
• Direct food contact - in food-grade virgin fiber, pressed trays and clamshells take hot, oily and moist food without a coating.

Where it is the right choice: box inserts and inner trays that substitute for foam, food-service containers and lids, premium cosmetic and gift cradles where surface quality is visible, and any part that must fit a tightly toleranced carton. Where transfer molding is still the better answer: deep-draw protective shapes and thick walled industrial trays where cushioning beats surface finish.

We run thermoforming on both production bases - Dongguan, China and Ho Chi Minh City, Vietnam - with MOQ 10,000 pieces per design, tooling in 7–15 days and production 15–25 days after sample approval. Not sure which process your part needs? Send us the part drawing and we will recommend one with an explanation.