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Envelope flap / envelope

Envelope flap
Envelope flap

Many people in the demoli on le􀂂er seal easy to tear or damage to the le􀂂er sucks, by tearing angle and the do􀂂ed line you can simply open the seal,it will not tear the le􀂂er.


Chung Hua University

Chung Hua University
Taipei, Taiwan

Hou, Chien-Ying,
Chung Hua University

Ye, Jhih-Wei,
Chung Hua University