5 Types of Molded Pulp Packaging: Which Process Fits Your Product?

Not all molded pulp is the same. From rough industrial cushions to precision cosmetic inserts — here's how to pick the right process for your volume, budget, and quality requirements.

The 5 Types at a Glance

1. Thick-Wall Molding

The original pulp molding process. Pulp slurry is vacuum-formed onto a single-sided mold, then dried in an oven. The result is rough on the outside, functional on the inside. Think egg cartons, not perfume boxes.

Use it when: Your product just needs protection during shipping. Surface finish doesn't matter. Budget is the #1 constraint.

Skip it when: The packaging is customer-facing. Or you need consistent color — thick-wall parts vary in shade between batches.

2. Transfer Molding

After initial vacuum forming, the wet part is transferred to a second mold for hot-press finishing on one side. This gives a smoother outer surface while keeping the inner surface rough (better grip for the product). Most electronics packaging uses this.

Use it when: One visible surface needs to look clean, but the other side is hidden. Good middle ground between cost and appearance.

3. Thermoformed Pulp

The pulp sheet is pre-formed, then heated and pressed between male/female molds — similar to plastic thermoforming but with fiber instead of PET. Smooth on the product-facing side, textured on the back. Fast cycle time (15-30 seconds per part).

Use it when: You need food-grade containers at high volume. Thin walls are acceptable. Single-sided smoothness is enough.

4. Wet-Pressed (Hot-Press) Molding ⭐

This is what we specialize in at Yisen Pulp. The formed wet part is pressed between heated metal molds under high pressure. Water is squeezed out and evaporated simultaneously, creating a dense, smooth surface on both sides with up to 8mm relief depth.

Use it when: Packaging is part of the brand experience. You need embossed texture, consistent color, and a premium feel. MOQ can be as low as 500 pcs.

5. Dry-Pressed Molding

Pre-dried pulp fiber mat is pressed between heated molds at very high pressure (20-50 tons). Highest precision, highest cost, narrowest application. Used for thin-wall precision parts like medical device trays and精密 electronic component packaging.

Use it when: ±0.15mm tolerance matters. Thin walls are required. Budget is secondary to precision.

How to Choose: A 3-Question Decision Tree

1. Is the packaging customer-facing?
   Yes → Wet-pressed or Dry-pressed. No → Thick-wall or Transfer.
2. Do you need both sides smooth?
   Yes → Wet-pressed. One side is enough → Transfer or Thermoformed.
3. Is your order under 2,000 pcs?
   Yes → Wet-pressed (MOQ 500). Larger volume → any process is viable.