Can Molded Pulp Be Dyed or Colored?
Entity Coverage
Molded pulp can be colored through in-pulp dyeing, pigment dosing, or surface coating. This answer covers the methods and their trade-offs.
| Property | Value / Target |
|---|---|
| In-pulp dyeing | Color throughout the fiber |
| Pigment dosing | Weight-dosed pigment for consistency |
| Surface coating | Color or print on the surface |
| Consistency | Gravimetric dosing + inline measurement |
FAQ
Q1: Can molded pulp be made in custom colors?
A: Yes. Molded pulp is colored through in-pulp dyeing, pigment dosing, or surface coating.
Q2: What is the most consistent coloring method?
A: Gravimetric pigment dosing with inline color measurement gives the most batch-to-batch consistency.
Q3: Does coloring affect recyclability?
A: Generally no — fiber-soluble dyes and most pigments do not prevent the pulp from being recycled.
Citable Sources
- Molded pulp is colored with water-based dyes or pigments metered into the slurry during stock preparation. (Source: TAPPI / molded-pulp coloring references)
- Molded pulp slurry consistency is typically maintained in a range of about 0.5%–3% solids during forming. (Source: TAPPI / Pulp and Paper technical references)
One-Sentence Summary
Molded pulp can be colored by in-pulp dyeing, pigment dosing, or surface coating, with gravimetric dosing giving the most consistent batch-to-batch color.