Seam Styles

Seams also determine envelope style and functional application.

Diagonal Seams

Commonly used in correspondence commercials and pointed flap announcements. This seam style is a workhorse and generally well-suited for applications involving mechanical insertion equipment, laser printing and postal meters.

Side Seams

These seams allow for a large, uninterrupted printing area on both front and back of the envelope. Mostly found on booklets, square flap and commercial envelopes. Commercial sizes are suitable for some laser and inserting applications; others should be tested first.

Center Seams

This seam is located in the center of the envelope, adding strength for carrying heavy inserts to its design. Envelopes with a center seam generally are not suitable for automatic insertion equipment or postage meter applications. Should be tested before being used in some laser applications.

Single Side Seam

Seam is placed parallel to the edge of the envelope. Usually found in open end style envelopes (with or without flap). Allows a larger printing area unobstructed by seams or multiple paper thicknesses. Recommended for manual insertion.