# Does the breathable film maintain performance during converting and lamination?

> Source: https://breathablefilm.com/news/knowledge-center/breathable-film-converting-lamination-performance/
> Author: kh_sales02
> Published: 2026-04-28
> Updated: 2026-08-28

## Key takeaways

- Kae Hwa films are engineered with thermal resistance to withstand the heat of thermal lamination without collapsing the micropores, preserving the finished composite's designed WVTR.
- Precision casting gives the film uniform molecular orientation for dimensional stability, preventing "necking" or narrowing under the tension of high-speed winding.
- Film surfaces are optimized for high peel strength, whether bonding with ultrasonic welding or hot-melt adhesives, so performance holds up through secondary processing.

## Frequently asked questions

### Does the breathable film maintain performance during converting and lamination?

Yes. Kae Hwa films are engineered for high-tension converting environments in three ways: thermal resistance lets them withstand the heat of thermal lamination without collapsing the micropores, so the finished composite keeps its designed WVTR; precision casting gives the film uniform molecular orientation for dimensional stability, preventing necking or narrowing under the tension of high-speed winding; and the surfaces are optimized for high peel strength, whether bonding with ultrasonic welding or hot-melt adhesives, so performance holds up through secondary processing.

### What is "necking," and why does it matter during high-speed converting?

"Necking" is when a film narrows or thins unevenly under the tension of high-speed winding, which can cause defects or inconsistent width in the finished roll. Kae Hwa's precision casting gives the film uniform molecular orientation for dimensional stability, preventing necking during converting.