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Click the relevant letter below to search for specific glossary terms.

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CALENDER FINISH
A term applied to a paper with a glazed surface finish created by means of calenders (cast iron rollers with chilled, hardened surfaces.) Other terms include machine finish, English finish, super-calendered and calender friction glazed. Semigloss litho and high gloss paper are examples of calendered paper.

CALIPER
The thickness of a sheet measured under specified conditions. Usually expressed in 1/1000th inch (points or mils).

CAMERA-READY
Any file of copy or graphics that is ready for photography in the mechanical, velox or stat platemaking process.

CATALOG ENVELOPES
Envelopes 4 x 6-3/8" and larger with a flap opening on the short side.

CENTER SEAM
The permanent seam located approximately in the center of the envelope running from the bottom fold and seam, up through the envelope to its throat. Center seams are most commonly used on coin and catalog envelopes.

CLASP
Metal fasteners sometimes used with re-moistenable gum on booklet and catalog envelopes. Clasps allow an envelope to be opened and closed repeatedly.

CLOSURES
Any product or substance used to seal the flap of an envelope. In addition to various adhesives (gums), metal clasps can be applied (most often to coin and catalog envelopes) for added durability. String-and-button fasteners are also used on envelopes that are opened and closed several times.

COATED PAPER
Paper that has been coated with clay and other materials to improve printability. More often used for four-color printing on envelopes, for direct mail and other applications.

COCKLE FINISH
An uneven, puckered surface created by air drying paper with a controlled amount of tension.

COMMERCIAL
General term for the most common style of business envelopes. Used for most correspondence and billing, the most popular being the #10 regular. Commercials are open side envelopes, with or without windows. See our Business Envelopes pages for a complete selection of commercial envelopes in all sizes.

CONVERTING
The process of producing a custom-sized or specially designed envelope, or any type of envelope not available in an envelope manufacturer's standard line.

CORNER CARD
Return address and other identification of the sender in the upper left corner.

COUPON
The tear-off tab portion of a Bang-Tail envelope.

COUNTED DOWN
When flaps are folded down against the back of an envelope. Most envelopes are boxed in this fashion, as opposed to flaps extended.

COURTESY REPLY
An envelope with a preprinted address on the face that is supplied without pre-paid postage.

CREASE
The scored line along which the seam of an envelope is folded.

CUT-OUT
A window envelope without the window patch material.

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