Envelopes with double-side seams
An envelope with double-side-seam construction has vertical seams at both ends of the envelope
rather than diagonal seams. This style might be more likely to wrinkle. Make sure that the seam
extends all the way to the corner of the envelope as shown in the following illustration:
1
2
1
Acceptable envelope construction
2
Unacceptable envelope construction
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Chapter 3 Media specifications
ENWW