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Paper & Pulp Dictionary Glossary "T"

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 Definitions for commonly used terms, words and phrases used in the pulp and paper trade

 

 

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T4S
Abbreviation indicating that the paper has been guillotine trimmed on all four sides. Literal translation: trimmed four sides.
Table Roll
The small diameter rolls used to support the wire.

Tack or Stickiness
Tack is a critical property of the ink used in lithography. Because the ink sits on a flat surface, it needs internal cohesion; in other words, it needs to stick to itself so that it doesn't run all over the plate. However, too much tack can cause it to pull the paper apart.

When printing two or more ink colors in line, the ink tack and sequence must be adjusted in order for the inks to adhere to each other as well as to the paper.

Tag Paper
A heavy utility grade of paper used to print tags, such as the store tags on clothing. Tag paper must be strong and durable, yet have good affinity for printing inks.
Talc
Mineral used in papermaking as a filler and coating pigment.
Tear Index
Tear index = tearing resistance/basis weight.
Tear Resistance
The mean force required to continue the tearing of paper from an initial cut under standardized conditions.
Tear Strength
A measure of how likely a paper will continue to tear once started. Tear strength will differ with and against the grain.
Tensile Energy Absorption (TEA)
It is the work done when a paper specimen is stressed to rupture in tension under prescribed conditions as measured by the integral of tensile strength over the range of tensile strain from 0 to maximum.
Tensile Index
Tensile index = tensile strength (N/m) /basis weight (g/m2).
Tensile Strength
A measure of how likely a paper is to break when pulled at opposite ends. This is very important when running through high-speed web presses.
Testliner
Mainly produced from waste paper used as even facing for corrugated board or as liner of solid board. They are often produced as duplex (two-layer) paper. The grammage is higher than 125 gsm.
Text Paper
Text papers are defined as fine, high quality uncoated papers. Typically, they are made in various colors, with numerous textures and a variety of surface finishes. Text papers are made from high-grade bleached wood pulp, cotton fibers, or tree-free pulp such as bamboo. Recycled sheets include high quality recycled waste paper and post-consumer waste pulp, in addition to bleached wood pulp, tree-free pulp or cotton fibers.
Thermal Paper
Any paper with a heat-sensitive coating on which an image can be produced by the application of heat.
Thermal Transfer Printing
Printing whereby a design image is first printed on heat transfer paper using inks with sublimable dispersed dyes.
Thermo Mechanical Pulping (TMP)
Mechanical pulp made by steaming wood chips under pressure prior to and during refining, producing a higher yield and stronger pulp than regular stone groundwood or regular refiner wood pulp.
Thin Paper
Includes carbonizing, cigarette, bible, air mail and similar papers.
Thinning
A practice in which certain trees are removed from a dense stand to allow the remaining trees adequate sunlight, nutrients and moisture to grow at an even rate.
Tint
To vary a color by adding white. Also, a very light or delicate variation of a color.
Tissue
A low weights and thin sheet. Normally a paper sheet weighing less than 40 gram per meter square is called tissue.

At-Home products: Also known as Consumer Products, these are the tissue products you purchase in the grocery store and convenience store for use in your home and include toilet paper and facial tissue, napkins and paper towels, and other special sanitary papers.

Away-from-Home products: Also known as Commercial & Industrial Tissue, these are the products that serve markets such as hospitals, restaurants, businesses, institutions, and janitorial supply firms.

Specialty: These types of tissue papers are often high-end, decorative papers that are glazed, unglazed, or creped, and include wrapping tissue for gifts and dry cleaning, as well as crepe paper for decorating.

Facial tissue: The class of soft, absorbent papers in the sanitary tissue group. Originally used for removal of creams, oil, and so on, from the skin, it is now used in large volume for packaged facial tissue, toilet paper, paper napkins, professional towels, industrial wipes, and for hospital items. Most facial tissue is made of bleached sulfite or sulfate pulp, sometimes mixed with bleached and mechanical pulp, on a single-cylinder or Fourdrinier machine. Desirable characteristics are softness, strength, and freedom from lint.

Titanium Dioxide
An opaque and expensive compound used as a white pigment and opacifier in papermaking. Elemental titanium is a lustrous, lightweight, white metal with exceptional strength.
Tolerance
Permissible degree of variation from a pre-set standard.
Ton on Tonne
Metric ton or Metric Tonne is equal to 1000 Kgs. or 2240 lbs. English tons are as defined. Long Ton = 2240 lbs is similar to metric ton. Standard English ton is 2200 lbs. Short ton is 2000 lbs.
Top Side
Side of the paper opposite to the wire side.
Total Alkali
NaOH + Na2S + Na2CO3 + 0.5*Na2SO3 all expressed as Na2O in alkaline pulping liquor.
Totally Chlorine Free (TCF)
Totally chlorine free applies to virgin fiber papers that are unbleached or processed with a sequence that includes no chlorine or chlorine derivatives. (Also see ECF)
Translucent Drawing Paper
A paper suitable for drawing office use; sufficiently translucent for an image on it to be reproduced by processes using transmitted light and for a design to be traced on it from an original placed beneath it. Such processes include blueprint and diazo.
Transparent Paper
Extended and particularly careful grinding of high quality fibers (hard chemical pulps, rags) yields a raw material permitting the production of transparent paper.
Treated Paper
Papers which have functional characteristics added through special treatment. Among the most common are insect resistant, mold resistant, clay coated, and flame retardant.
Trim
To cut true to exact size, by cutting away the edges of paper in the web or sheet.
Tub Sizing
The operation of surface sizing paper by passing it through a bath of a suitable solution such as gelatin.
Tube Digester

Single or multi-tube continuous digester; used mainly in nonwood pulping and sawdust pulping purposes; horizontal tubes..

Twin-wire Machine
A papermaking machine with two continuous forming wires, rather than just one. Twin-wires were designed to create a less two-sided paper than paper manufactured on a Fourdrinier paper machine.

Other techniques for reducing two-sidedness have since been developed, enabling paper manufacturers to create paper on single-wire machines with little side-to-side variation.

Two Parallel Fold
An excellent fold for legal size (or larger) pieces that are to be mailed. A legal sheet (8.5" x 14") is folded to 3.5" x 8.5". A 9" x 16" sheet produces a 4" x 9", four panel brochure. Note: A perforation added at one of the folds can create a three panel brochure with detachable reply card. For picture of this type and other fold please visit http://www.bradenprint.com/pdf/Folds-IS.pdf
Two-Sidedness
The property denoting a difference in appearance and printability between its top (felt) and wire sides.
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