Cold-Needle Perforation

In this process, conical needles pierce the web (e.g., paper, thin metal foils, PE films). The grooves of the counter roller match exactly with the needle pattern. The needles create funnel-shaped holes. This causes, for example, in paper increased water permeability and in PE films air permeability.

Characteristics

Characteristic Explanation
Funnel Shaped Holes The needles create funnel-shaped holes. This causes for example, in paper increased water permeability and in PE films air permeability.
No Material is removed In this method, no material is removed. Therefore, the holes may partially close again when pressure is applied to the web.
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