All the technical information you need to know about specifying envelopes including envelope size chart, styles and closures.
2. (Top) Flap
1. Depth 7. Right Hand Side Seam
2. Length 8. Throat
3. (Top) Flap 9. Top Flap Crease
4. (Depth) of Flap 10. Gum Line
5. Back Flap 11. Gum Area
6. Left Hand Side Seam 12. Shoulder
Opening along the long edge.
Opening along the short edge.
Traditionally used for greeting card envelopes.
Opens along the long edge, the most common form of envelope in use today.
General construction as Standard Wallet, but with the side seams folded outside the backflap. Ideal for filling machine use
Used wherever the contents need some form of protection. Printed 'Please do not bend' in red.
Envelopes with expanding side and bottom seams and extra length flap, to take bulky items, such as catalogues.
The flap has a strip of gum which must be moistened and secured down to seal.
The bottom part of the flap is folded down, as is the top part. Both parts have a strip of latex. To seal, the top and bottom parts of the flap are lifted and the top part then folded over the bottom part and pressed together to form a seal.
Superseal (Peel and Seal)
An area of gum is applied to the flap and a silicone strip is attached. This strip is removed and the exposed gummed flap is turned down over the back of the envelope and pressed down to securely seal.