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Why do some paper cups leak at the seam?

August 31, 2026

Why do some paper cups leak at the seam?
The answer is skiving.
Die‑cut cup blanks have exposed paper edges that let liquid seep out.
Skiving shaves partial paper layers, keeps PE coating, folds and glues the edge.
The seam gets fully wrapped by PE film.
It cuts leakage rejects for hot drinks, dairy and oily food.
A key process for premium paper cups
 
 
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