Published: 2026-07-20 | Category: Manufacturing Guide
Molded pulp packaging (also called molded fiber packaging) is an eco-friendly packaging material made from recycled paper, cardboard, and natural plant fibers including bagasse, bamboo, and wheat straw. It is 100% biodegradable, compostable within 90 days, and fully recyclable in the paper waste stream.
Raw materials (recycled newsprint, kraft paper, bagasse) are mixed with water in a hydropulper to create a fiber slurry at 3-5% consistency. Water-resistant agents, dyes (Pantone-matched), and strength enhancers are introduced at this stage for custom requirements.
The fiber slurry is pumped into forming molds where vacuum suction draws fibers onto the mold surface. Three primary methods are used depending on the application:
Freshly formed products contain 65-75% moisture. Drying methods include conveyor drying at 120-180?C (20-40 minutes), in-mold hot press drying at 150-200?C, and microwave-assisted drying which reduces cycle time by up to 40%.
For premium packaging, hot press molds apply 15-40 tons of pressure at 150-200?C. This achieves 0.2mm dimensional tolerance and up to 8mm relief depth for embossed logos, brand textures, and decorative patterns ??all formed directly into the fiber without inks or adhesives.
Edge trimming removes excess material. QC inspection checks weight consistency (?3%), dimensional accuracy, drop test performance (ISTA standards), and moisture content. Final products are packed and prepared for shipment.
| Industry | Application | Key Requirement |
|---|---|---|
| Cosmetics | Perfume trays, gift boxes | Surface finish, embossing |
| Electronics | Cushion inserts, device trays | ESD protection, precision |
| Food & Beverage | Egg trays, cup carriers | Food-grade certification |
| Automotive | Parts trays, protective packaging | Heavy-duty, oil resistance |
| Medical | Device trays, vial holders | Cleanroom, sterile |
| Industrial | Equipment packaging | High strength, custom sizing |