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Do you feel trouble for that you always cant tear the
correct type which you want when open package?
Here is a excellent solution.It's simple and cheap to
add two tiny seam gap at the open notch.
By this two seam gap, you could determine the open
direction you really want to avoid unnecessary mistakes.
National Taipei University of Technology
Taipei, Taiwan
National Taipei University of Technology
Taipei, Taiwan
Chao-Hsiang Li, Wan-Yun Chou