๐“๐จ๐๐š๐ฒ'๐ฌ ๐Š๐๐Ž๐–๐‹๐„๐ƒ๐†๐„ ๐’๐ก๐š๐ซ๐ž : ๐’๐ฎ๐ซ๐Ÿ๐š๐œ๐ž ๐ฌ๐ข๐ณ๐ข๐ง๐  ๐ข๐ฌ ๐ฆ๐จ๐ฅ๐ž๐œ๐ฎ๐ฅ๐š๐ซ ๐ž๐ง๐ ๐ข๐ง๐ž๐ž๐ซ๐ข๐ง๐ 

๐“๐จ๐๐š๐ฒ'๐ฌ ๐Š๐๐Ž๐–๐‹๐„๐ƒ๐†๐„ ๐’๐ก๐š๐ซ๐ž

๐’๐ฎ๐ซ๐Ÿ๐š๐œ๐ž ๐ฌ๐ข๐ณ๐ข๐ง๐  ๐ข๐ฌ ๐ฆ๐จ๐ฅ๐ž๐œ๐ฎ๐ฅ๐š๐ซ ๐ž๐ง๐ ๐ข๐ง๐ž๐ž๐ซ๐ข๐ง๐  — ๐ง๐จ๐ญ ๐ฃ๐ฎ๐ฌ๐ญ ๐ฌ๐ฎ๐ซ๐Ÿ๐š๐œ๐ž ๐ญ๐ซ๐ž๐š๐ญ๐ฆ๐ž๐ง๐ญ.


At the fiber–size interface, three interactions dominate:


1. Hydrogen bonding

Modified starch hydroxyl groups anchor onto cellulose via hydrogen bonds. This improves surface strength and linting resistance.


2. Polymer dispersion

Latex or styrene–acrylate particles distribute within the starch matrix, forming a co-continuous film during drying.


3. Hydrophobic orientation

As water evaporates, hydrophobic side chains migrate toward the air interface. This lowers surface energy and enhances water resistance.


So sizing is not only “adding starch.”

It is controlling interfacial chemistry, film formation, and molecular orientation during drying.


Performance starts at the nano-scale.


source : Packaging Simplified


#FiberMorphology #SurfaceChemistry

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