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• Back Gum
• This is the adhesive strip along the back of the envelope. For back gum adhesives, it can only be sealed once as the gum cannot be remoistened for sealing.

• Bang Tail
• This is used for Business Reply Envelopes. It has an extra flap where the receiver will tear off the flap and fill in the required information to insert into the envelope. The remainder flap will be folded over to seal the envelope shut for sending.

• Banker Envelope
• This envelope's distinguishing feature is a triangular flap to close on the long edge.

• Banker's Flap
• A larger than normal seal flap.

• Baronial Envelope
• This envelope type has a large triangular flap. Examples of baronial envelopes are greeting card or invitation card envelopes.

• Booklet Mailer
• This envelope type opens on the long edge; making it easier to insert and take out documents. It often comes in A4 size and has a window.

• Business Reply Envelope / Return Envelope
• The special feature about the Business Reply Envelope is that the postage has already been paid by the sender. It is used for correspondence that requires the receiver to reply e.g. subscriptions, bill payment, etc.
  
  With the Return Envelope, the address of the sender has been printed onto the envelope but the receiver will still have to attach a stamp in order to mail it.

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• Catalogue Envelope
• This envelope's open flap is at the long end of the envelope to make inserting documents easier.

• Catalogue Envelope (Open End)
• For the Open End Catalogue Envelope, the flap is located on the envelope's short side.

• Centre Seam
• Located in the centre of the envelope, the permanent seam runs from end to throat.

• Clasp Envelope
• This is a Catalogue Envelope with a metal clasp to close the envelope temporarily.

• Coin Envelope
• Small Catalogue Envelope.

• Commercial Envelopes
• Commercial Envelopes are used for business because documents can be inserted easily into them. They come in Open Side type with either diagonal or side seam.

• Corner Card
• This means the return address or printing located on the upper left corner of the envelope.

• Cut-out
• A cut-out means a panel(s) that is cut into the front, back or both of an envelope to create a window.

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• Diagonal Seam
• This is a diagonal seam on the envelope.

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• Flaps Extended
• This describes the vertical position of the seal flaps which is left upright after printing.

• Filler
• See Loading.

• Fluffing
• See Linting.

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• Gummed or Seal Gum
• This is the typical moistened sealing method using gum.

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• Indicia
• This is the printing located on the envelope's upper right corner. Typically where the postage-paid notice or placement box for the stamp is located.

• Inside Tint
• The inside tint is a dark tint on the inside of the envelope to obscure the envelope's contents from view. It helps to maintain the confidentiality of the envelope.

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• Lightweight printing paper
• Printing paper having exceptionally high opacity for its weight and designed for printing applications requiring lightweight paper with basis weight in the range of 17-40 lb/25 x 38-in.ream (25-59 g/m2).

• Linen finish
• A finish imparted to paper originally by plating with linen cloth, and now by embossing that has the pattern of a linen cloth.

• Lint
• Loosely bonded surface fibres that become attached to a plate or blanket and interfere with print quality.

• Linting
• The removal of fibrous material from paper during printing. Alternative term: fluffing.

• Loading
• Inorganic materials like clay, titanium dioxide, calcium carbonate, and other white pigments added to the paper finish to improve opacity, brightness, and the printing surface of paper. Alternative term: filler.

• Long-Grain Sheet
• A sheet whose longer dimension parallels the grain direction.

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• Machine Direction
• The direction in which the fibres flow to the paper machine; the direction of web travel through the paper machine.

• Machine Finish
• A smooth finish obtained with calendaring, produced on the paper machine.

• Machine Glazed
• Having a highly polished finish applied to one side of the paper when it dries against the polished surface of the large-diameter cylinder of a Yankee-type paper machine.

• Manifold Paper
• A lightweight bond paper used for making carbon or manifold copies or for airmail correspondence.

• Manila Hemp
• A fibre used for the manufacture of strong, tough papers, obtained in the Philippines and Central and South America.

• Matte Surface
• A surface having a very low gloss, reflecting most of the incident light in all directions on the measuring surface and the paper surface under specified conditions.

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• Open End Envelope
• This type of envelope opens on the short side.

• Open Side Envelope
• This type of envelope opens on the long side.

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• Peel-n-Seal Envelope
• With a peel-n-seal envelope, a protective strip is placed over the gum/adhesive strip on the flap. When the protective strip is peeled away, you can seal the envelope without using any glue by pressing the flap close.

• Plain Faced
• An envelope that has no window.

• Pocket Envelope
• An envelope that opens on the short edge.

• Press Seal
• This is an envelope which has two flaps used for closing. On each flap there is an adhesive which when pressed together will seal the envelope.

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• Regular Envelope
• Simply an envelope that does not have any cut-outs, namely windows or panels, in it.

• Remittance Envelope
• See Booklet Mailer.
  This envelope type has an extra large flap. It is supposed to be mailed in a cover envelope and then returned to sender.

• Return Envelope
• See Business Reply Envelope.

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• Seal Flap
• This is the diagonal or horizontal flap(s) of the envelopes which is sealed during the manufacturing process.

• Seal Gum
• This is the adhesive which seals the flaps of the envelopes. There are three kinds of adhesives used:
  • Latex - this glue requires two surfaces of gum and no moisture to seal the envelope.
  • Remoistening - this adhesive strip requires water/saliva to seal the envelope.
  • Flip & Stick - this has a protective silicon paper strip which when removed allows you to seal the envelope with adhesive strip underneath.

• Shive
• An under-fibered fibre bundle removed from wood during grinding, or one of a group of undigested fibre bundles remaining after the cooking of chemical pulp.

• Short-Grain Sheet
• A sheet whose shorter dimension parallels the grain direction.

• Show-Through
• Visibility of the printing on the reverse side of the paper.

• Side Roll
• A roll run side by side with other rolls to give a paper machine fill.

• Side Seam
• An envelope seam that runs almost parallel to the side fold.

• Size Press
• That part of the paper machine at which surface sizing is applied to the web by passing it through the nip of two rollers.

• Sizing
• The treatment of paper with materials or chemicals to impart resistance to water, oils and other fluids, to seal down its surface fibres and to improve its surface strength.

• Skips
• Missing dots in gravure printing due to lack of ink transfer from the individual cells of the gravure cylinder to the paper during printing impression. Alternative terms: snow; speckle.

• Slack-Sized Paper
• A paper having a low degree of internal sizing.

• Slice
• The adjustable rectangular orifice at the front of the paper machine head box whose purpose is to deliver a continuous stream of water-suspended fibres having a uniform thickness, consistency and velocity across the paper machine close to the wire speed.

• Slime Spot
• A fragile spot or hole in the paper resulting from a bacterial growth or slime that originated in the paper marking system and was formed into the paper.

• Sling Paychrometer
• A device having wet and dry-bulb thermometers that are whirled vertically in the atmosphere to provide readings from which, in conjunction with paychometric tables, the percent relative humidity is determined.

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• Throat
• This is the envelope's opening which can be sealed.

• Thumb Cut
• An envelope without a flap. It has a u-shaped cut at the open end to allow easier inspection and access of contents.

• Two Way
• This envelope is similar to the Bang-Tail. However, it has a single perforated flap to insert into the envelope.

• Tyvek®
• This is a water resistant and highly durable material used in envelope making. It is created by DuPont.

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• Wallet Envelope
• An envelope that has a long rectangular closure flap across the long edge of the envelope.

• Wallet Flap
• A large style seal flap.

• Window Faced
• This is an envelope that has a window for displaying addresses.

• Window Envelopes
• Window envelopes are envelopes with a cut-out (called a window) to display the document's information. The window is covered with a transparent material like plastic to easily see essential information such as contact name and address.