Kae Hwa Knowledge Center

Breathable Film Technology & Industry FAQ Guide

Knowledge Center/4. Applications & Selection

How does PackDry™ prevent liquid and fine carbon dust from leaking in dehumidifiers and deodorizing bags?

In functional packaging such as desiccant boxes and active carbon deodorizers, the membrane must execute a paradoxical task: allow continuous airflow while completely blocking liquid water and microscopic powders. Kae Hwa Industrial engineered the PackDry™ laminate series to solve this using a dual-defense micro-structure combined with superior seal weldability.

The Dual-Defense Micro-Structure

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Liquid Condensation Barrier

Dehumidifiers rely on Calcium Chloride, which turns into a liquid brine as it absorbs moisture. PackDry’s microporous film features pores that are approximately 20,000 times smaller than a water droplet. This physical absolute ensures that while moisture vapor can enter the bag, the collected liquid brine can never seep back out, even if the bag is squeezed or overturned.

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Fine Particulate & Dust Filter

Active carbon and silica gel produce ultra-fine, abrasive dust during transport. PackDry utilizes a protective nonwoven layer laminated to the functional film. The nonwoven acts as a pre-filter, while the sub-micron pores of the PE film permanently trap carbon powder inside, preventing black stains on user’s clothing or closets while allowing odor molecules to pass through freely.

The Critical Factor: Sealing Integrity

Over 80% of packaging leaks do not occur through the fabric itself, but at the edges where the bag is sealed. Traditional chemical adhesives can fail under the chemical stress of desiccants.

  • Ultrasonic & Thermal Compatibility: PackDry laminates are manufactured using solvent-free in-line lamination. The pure polymer composition allows for flawless thermal or ultrasonic welding on high-speed packaging lines.
  • Burst Resistance: By seamlessly melting the nonwoven and film layers together at the seams, PackDry ensures high tear and puncture resistance, eliminating edge-burst failures during shipping and handling.