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[Diaperman] Ep.14 The Pulp Inside Diapers Comes from Eucalyptus Trees?! The Science of Eucafluff

🎬 Full video: https://youtube.com/shorts/5WJgdXKybOY?feature=share

Diaperman Ep.14 — the pulp inside diapers comes from eucalyptus trees?!

One-Line Summary

The white fluff inside a diaper's absorbent core — Brazil's Suzano created Eucafluff® in 2015, the world's first fluff pulp made from eucalyptus short fiber. Shorter fibers build a denser capillary network, cutting rewet and boosting liquid retention.

The pulp inside diapers comes from eucalyptus?! The world's first eucalyptus fluff pulp — Eucafluff

The Skeleton of the Absorbent Core: Fluff Pulp

Tear open a diaper and alongside the white powder (SAP, from Ep.3) you'll find something else: white, cotton-like fluff pulp. It's the skeleton of the absorbent core we saw in Ep.4. This pulp wraps around the SAP and acts as a capillary network that spreads urine across the entire core.

But this pulp was originally made from long-fiber (softwood) timber like pine. Long, tough fibers (2–4 mm) held the structure together. Then one company flipped the idea on its head.

World's First: Eucalyptus Fluff Pulp

Short fiber vs long fiber — eucalyptus 0.5–1.5 mm vs pine 2–4 mm; shorter means a denser mesh

Suzano of Brazil — the world's largest market pulp producer. After 15 years of research, in 2015 it launched the world's first bleached kraft fluff pulp made from 100% plantation eucalyptus. Its name: Eucafluff®.

Eucalyptus is a hardwood — that is, short fiber. Its fibers run 0.5–1.5 mm, less than half the length of pine's. And that "shortness" turned out to be its weapon.

Shorter Means a Denser Mesh — Less Rewet

What is rewet? Absorbed urine coming back up to the surface — a denser capillary mesh curbs rewet and boosts absorption

Short, fine fibers build a denser capillary network. Research (MDPI, 2022) shows hardwood fibers absorb faster than softwood and suffer less rewet (absorbed liquid pushed back to the surface under pressure). Suzano's market testing found the same: improved rewet performance, liquid retention, and softness — letting diapers get thinner and more discreet.

The Market Responded — From 100,000 to 440,000 Tons

The bottom line: thinner, softer diapers!

Suzano invested about $100 million in its Limeira plant in Brazil, expanding fluff pulp capacity from 100,000 to 440,000 tons per year — more than a fourfold jump — with startup in December 2025. It also recently earned OEKO-TEX Standard 100 certification (hazardous-substance safety testing).

The reason diapers got thinner? Hidden behind it was the fiber length of a single tree. The science you're too embarrassed to ask about — this was Diaperman!

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Are you team thin diapers or team thick-and-reassuring? Vote in the comments!

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🎬 Full video: https://youtube.com/shorts/5WJgdXKybOY?feature=share

*The videos and illustrations in this post were AI-generated.*

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