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Glossary

Paper Glossary

 

This page contains list of various types of pulp and paper based on their end use, process of manufacturing, raw material used etc. There are thousands varieties of paper. Some of the major grades classifications are given below;

1. Based on basis weight
Tissue: Low weight, <40 g/m2
Paper: Medium weight, 40 - 120 g/m2
Paperboard: Medium High weight, 120-200 g/m2
Board: High weight, >200 g/m2

2. Based on Color
Brown: Unbleached
White: Bleached
Colored: Bleached and dyed or pigmented

 

3. Based on Usage
Industrial: Packaging, wrapping, filtering, electrical etc.
Cultural: Writing, printing, Newspaper, currency etc.
Food: Food wrapping, candy wrapping Coffee filter, tea bag etc.

4. Based on Raw Material
Wood: Contain fibers from wood
Agricultural residue: Fibers from straw, grass or other annual plants
Recycled: Recycle or secondary Fiber

 

5. Based on Surface Treatment
Coated: Coated with clay or other mineral.
Uncoated: No coating
Laminated: aluminum, poly etc

6. Finish
Fine/Course
calendered/ supercalendered
Machine Finished (MF)/Machine Glazed (MG)
Glazed/Glossed

A
Abrasive Papers
Covered on one or both sides with abrasive powder, e.g. emery, sandpaper etc.

Absorbent Paper
Characteristics of Absorbing liquids such as water and ink. These papers are soft, loosely felted, unsized and bulky e.g. blotting paper.

Acid Free Paper
It does not contain any acidic substance that may affect acid sensitive material. It is used for metal wrapping.

Acid Proof Paper
A paper that is not affected by acid physically or chemically. This paper is used with substance containing acid.

Adhesive Paper
Base paper for coating with an adhesive.

Air Filter Paper
It is used in filtration of air to remove suspended particles. (car air filter, vacuum bag etc.)

Album Paper
Paper used in photographic albums. It has a soft surface which will not wrinkle or cockle when photographs are pasted or glued on it, and when wet with such adhesive, it will not `bleed`.

Alkaline Paper
having pH values greater than 7 and made by using an alkaline sizing process.

Alkali Proof Paper
A paper, either white or colored, which does not discolor when in contact with alkaline materials, such as soap. Careful selection of fibers and coloring matters is necessary, but no particular strength requirements need be met. 

Aluminum Foil Lamination
The combination of thin Aluminum foil with a paper backing used as a positive moisture barrier. 

Ammunition Paper
The type of papers used in the manufacture of ammunition such as cartridge paper, which forms the tube section of shotgun shell and base wad paper, which is used in the base of the shell.

Anti Rust Paper
Paper containing added substances which gives it the property of protecting the surfaces of ferrous metals against rusting.

Anti-Tarnish Paper
A term originally applied to tissues used for wrapping silverware, but now used for all papers so prepared that they will not rust or discolor razor blades, needles, silverware, etc. Various fibers are used and weights of paper made; the chief requirements are freedom from acidity and reducible sulfur compounds. Copper salts or other inhibitors are sometimes used for silver tissues.

Antique Paper
Printing paper having good bulk and opacity with rough or matt surface.

Archival Paper
A paper that is made to last for long time and used for long lasting records.

Art Paper
High quality and rather heavy two-side coated printing paper with smooth surface.

Artificial Parchment
Wood free paper that is produced by fine and extended grinding of certain chemical pulps and/or the admixture of special additives. It is used for wrapping meat and sausages or as corrugating medium for biscuit packaging.

Asbestos Paper
A fire retardant and heat insulating paper made mainly from asbestos fiber on a cylinder machine.

Asphalt Laminated Paper
Two sheets of natural Kraft paper laminated in a single ply by means of asphalt. This is used as a moisture barrier; also to resist action of weak acids and alkalis .

Azurelaid Paper
A laid paper usually bluish green in colour having a good writing surface.

B
Back Liner
The back side layer in a multi-ply paperboard. Normally back liner is made out of inferior grade pulp compared to top liner.

Currency Paper
Used for printing currency. Very high folding endurance, permanency, tensile strength, suitable for 4-colour printing, with watermark and other falsification safeguards such as embedded metal strip. The material used is cotton fibers.

Barograph Paper
Red thin paper coated on one side with a white wax, so that the needle of the barograph leaves a red line on a white ground, sold in rolls and coils and to suit the type of barograph.

Baryta Paper
Coated with barium sulfate to give a smooth, low-gloss surface; used mainly as a base for photographic emulsions.

Base Paper
Refers to paper that will be subsequently be treated, coated or laminated in other ways.

Blade Wrapping Paper
Translucent paper used for individual wrapping of razor blades.

Blueprint Paper
Base paper for blue printing. 

Board
Thick and stiff paper, often consisting of several plies, widely used for packaging or box making purposes. Its grammage normally is higher than 150 g/m2 or thickness is more than 9 point (thousandth of an inch).

Bond Paper
A high quality writing & printing paper used for letterheads and many printing purposes. Important characteristics are finish, strength, freedom from fuzz, and rigidity.

Book Paper
A general term used to define a class or group of papers having in common A paperboard used in the manufacture of light non-corrugated container.

Boxboard
A class of board frequently lined on one or both sides, with good folding properties and used for making box and cartons.

Bread Wrapping Paper
Used for wrapping sliced bread. It is thin, waxed paper normally made opaque for printing by loading with titanium dioxide.

Bristol Board
A fine quality cardboard made by pasting several sheets together, the middle sheets usually of inferior grade.

C
Cable paper
A strong paper suitable for cutting into narrow strips and winding on wire as insulation. High tensile strength is essential.

Carbon paper
A low basis weight paper (8 to 15 g/m2) with very low air permeability, free of pin holes and with a waxy coating, that is used to produce carbon copies of original documents during printing..

Carbonless Paper
A paper that uses a chemical reaction between two different contacting coatings to transfer image when pressure is applied.

Cardboard
A thin, stiff paperboard made of pressed paper.

Carton board
A rigid wood fiber based packaging material. Carton-board is normally of at least 180-g/m2 substance and 250 microns thickness.

Cast Coated Paper
A coated paper with high gloss and absorbtivity in which the coating has been allowed to harden or set while in contact with a mirror like polished chrome surface.

Chart Paper
A paper with the characteristics of bond or ledger papers. It must have good printing and erasing properties and low expansion and contraction with changing humidities. Used for making charts and graphs.

Check or Cheque Paper (MICR)
A strong, durable paper made for the printing of bank checks or cheques. By careful formulations the paper is designed to react against a wide range of ink eradicators. It gives a characteristic coloured stain of "flare up" on contact with acid, alkali, bleach and organic solvents like acetone, benzene, ethanol.

Chipboard
A paperboard, thicker than cardboard, used for backing sheets on padded writing paper, partitions within boxes, shoeboxes, etc.

Chromo Paper / Board
It used for subsequent brush coating. The coating may be applied to one or both sides, depending on end use.

Cigarette Paper
This light weight, unsized paper (grammage 18 to 24g/m2), converted to improve glowing. It normally has approx. 30% calcium carbonate as filler to control the burning rate and match it with tobacco burning rate. Very long fiber such as jute, cotton etc is used to achieve high strength and porosity.

Clay Coated Boxboard
A grade of paperboard that has been clay coated on one or both sides to obtain whiteness and smoothness. It is characterized by brightness, resistance to fading, and excellence of printing surface. Colored coatings may also be used and the body stock for coating may be any variety of paperboard.

Coated Paper
 The paper having Material such as clay, casein, bentonite, talc, applied by means of roller or brush applicators; or plastics applied by means of roll or extrusion coaters.

Coated White Top Liner
White liner that is coated to produce superior printability.

Coffee Filter Paper
Used for coffee filtering. Paper should have no impurities or fillers. It is a wet strength paper and able to withstand boiling water. Synthetic resins are used for to provide wet strength.

Commodity Paper
A classification for low-quality bond and offset papers.

Colored Kraft
Natural or bleached kraft paper to which a dye or pigment has been added.

Condenser Tissue
A very thin paper of uniform thickness, good formation, and especially free from conducting particles. Used as a dielectric between the foils of condensers.

Construction Paper
Sheathing paper, roofing, floor covering, automotive, sound proofing, industrial, pipe covering, refrigerator, and similar felts.

Containerboard
The paperboard components (linerboard, corrugating material and chipboard) used to manufacture corrugated and solid fiberboard. The raw materials used to make containerboard may be virgin cellulose fiber, recycled fiber or a combination of both.

Copier Paper or Laser Paper
Lightweight grades of good quality and dimensionally stable papers used for copying correspondence and documents.

Correspondence Papers
Writing papers in attractive finishes, weights or colors.

Corrugated Board
Usually a nine-point board after if has passed through a corrugating machine. When this corrugated board is pasted to another flat sheet of board, it becomes single-faced corrugated board; if pasted on both sides, it becomes double-faced corrugated board or corrugated (shipping) containerboard.

Corrugated Medium or Fluting Media or Media
The wavy center of the wall of a corrugated container, which cushions the product from shock during shipment (see flute). Media can contain up to 100% post-consumer recycled fiber content without reducing its ability to protect the product.

Cotton Paper or Rag Paper
Paper made with a minimum of 25% cotton fiber. Cotton paper is also called rag paper.

Cover Paper
Any wide variety of fairly heavy plain or embellished papers, which are converted into, covers for books, catalogs, brochures, pamphlets, etc. Good folding qualities, printability, and durability characterize it.

Creamwove Paper
Medium brightness paper now mainly used for computer stationery purposes.

Crepe Paper
A light weight paper, normally colored, with crinkly finish used for party decoration.
D

Decalcomania Paper
A type of transfer paper that allows the transfer a printed image to another object such as glass. Also called a decal.

Directory Paper
A light weight grade of catalog or printing paper with good strength, high opacity and good printability. It is made from a mixture of bleached chemical, semi-chemical, CMP and recycled fiber and used for printing telephone directory. 

Drawing Paper
Dull finished paper that is of good quality and stable enough to withstand erasing.

Duplex Board /Paper
Paperboard made with two plies or layers. Normally two layers are formed and joined together at wire part.

E
Electrical Grade Paper
Strong, pin-hole free paper, sometimes impregnated with synthetic resins and made from unbleached Kraft pulp. Electrical insulating paper must neither contain fillers nor conductive contaminants (metals, coal, etc.) nor salts or acids. Electrical grade papers include cable papers, electrolytic papers and capacitor paper.

Envelop Paper
The paper made specifically for die cutting and folding of envelopes on high-speed envelop machine.

Extensible Kraft
Very strong virgin Kraft papers which stretches (approximately 6%) more in MD and tears less easily than regular Kraft paper.

Extrusion Coated Board
Board that has been covered with a continuous layer of a thermoplastic material, typically polyethylene or polypropylene, by the extrusion coating process i.e. where a thermoplastic material is melted and forced through a narrow slot onto a moving web of board.

F
Fax Base Paper
It is first coated with photo conductive zinc oxide on which images are exposed. Hence electrical conductivity / resistivity is to be controlled to ensure that the image is not conducted through the paper to the other side

Fiberboard
Board made from defibrated wood chips, used as a building board.

Filter Paper
Unsized paper made from chemical pulp, in some cases also with an admixture of rags, sometimes with a wet strength finish. Filtration rate and selectivity, which are both dependent on the number and the size of the pores, can be controlled by specific grinding of the pulps and creping.

Fine Papers
Uncoated writing and printing grade paper including offset, bond, duplicating and photocopying.

Flame Resistant
Treatment applied to kraft paper to make it resistant to catching on fire (not fire proof—will char but not burst into flame).

Fluorescent Paper
Paper coated or surface treated with fluorescent dye to make it glow in dark. Used for labels, posters and decorative application.

Folding Boxboard
Single or multi-layer paperboard made from primary and/or secondary fibers, sometimes with a coated front, used to make consumer packaging (cartons).

G
Gasket Board
A highly absorbent pulp board, which is chemically treated for use in making gaskets.

Glassine Paper
A translucent paper made from highly beaten chemical pulp and subsequently supercalendered.

Glazed Paper
Paper with high gloss or polish, applied to the surface either during the process of manufacture or after the paper is produced, by various methods such as friction glazing, calendering, plating or drying on a Yankee drier.

Granite Paper
A paper containing a small percentage of deeply dyed fibers to give a characteristic mottled effect.

Gravure Paper
Paper for gravure printing that has very low print roughness and good wettability of gravure inks.

Gray Board
A homogeneous board made usually of mixed waste papers with or without screenings and mechanical pulp on a continuous board machine, in thickness less then 1 mm.

Greaseproof Paper
A protective wrapping paper made from chemical wood pulps, which are highly hydrated in order that the resulting paper may be resistant to oil and grease.

Green Paper
Immature paper which has not been conditioned or had the opportunity to mature naturally.

Gummed Paper /Board
The main ingredient in gypsum board is gypsum (calcium sulfate - Ca2SO4), a mineral.. Board is lined with sheet of paper on both sides. This is used for making panel boards for interior partitions, false ceiling etc.

H
Handmade Paper
A sheet of paper, made individually by hand, using a mould and deckle.

Hanging Paper
The raw stock used in making wall paper. The converter usually coats it with a ground coat of clay, and then prints it with any decorative design desired.

Hard Sized Paper
Paper treated with high degree of internal sizing.

Heat Seal Paper
Paper that has an adhesive coating applied to it that requires heat to activate the adhesion properties.

Heat Transfer Paper
The paper used in Thermal transfer printing (Sublimation printing).

I
Index Paper
A stiff, inexpensive paper with a smooth finish. The high bulk but low weight of this paper makes it a popular choice for business reply cards.

Industrial Papers
A very general term, which is used to indicate papers manufactured for industrial uses as opposed to cultural purposes. Thus, building papers, insulating papers, wrapping papers, packaging papers, etc. would be considered industrial papers.

Insulating Board
A type of board composed of some fibrous material, such as wood or other vegetable fiber, sized throughout, and felted or pressed together in such a way as to contain a large quantity of entrapped or "dead" air. It is made either by cementing together several thin layers or forming a non-laminated layer of the required thickness. It is used in plain or decorative finishes for interior walls and ceilings in thicknesses of 0.5 and 1 inch (in some cases up to 3 inches) and also as a water-repellent finish for house sheathing. Desirable properties are low thermal conductivity, moisture resistance, fire resistance, permanency, vermin and insect resistance, and structural strength.

Ivory Board
High-quality board made in white or colors with a bright, clear appearance, particularly used for visiting cards and similar high-class printed work. Original Ivory Board was and still is made in
Holland, although the grade is made in many countries.

K
Kraft Bag Paper
A paper made of sulfate pulp and used in the manufacture of paper bags. It normally has a greater bulk and a rougher surface than the usual kraft wrapping paper.

Kraft Paper
A paper of high strength made from sulfate pulp. Kraft papers vary from unbleached Kraft used for wrapping purposes to fully bleached Kraft used for strong Bond and Ledger papers.

Kraft Waterproof Paper
A highly moisture resistant paper made of sulfate pulp and treated with moisture repellent material such as paraffin wax or asphalt and used for wrapping purposes.

Kraft Wrapping Paper
A group of paper grades made from sulfate pulp using various material and used for general wrapping purposes.

Kraftliner
Paperboard of grammages of 120g and more, generally made from bleached or unbleached sulfate pulp and used as an outer ply in corrugated board.

L
Label Paper
Mostly one-side coated papers which must be printable in 4-colour offset and gravure printing. These papers are usually suitable for varnishing, bronzing and punching and sometimes also feature wet strength and alkali resistance (See "Wet strength and alkali resistant paper") in order to en-sure the removal of the labels e.g. in the bottle rinsing machines of breweries

Laid Paper
Paper that has a laid finish. Commonly used for letterheads and personalized stationary.

Laminated Paper
A paper built up to a desired thickness or a given desired surface by joining together two or more webs or sheets. The papers thus joined may be alike or different; a totally different material, such as foil, may be laminated with paper.

Laminated Linerboard
Two or more plies of linerboard adhered to one another for increased structural stability.

Ledger Paper
A strong paper usually made for accounting and records. It is similar to Bond paper in its erasure and pen writing characteristics.

Light Weight Coated (LWC)
Coating applied at 7-10 g/m2 on one or both sides of the paper

Light Weight Paper
Papers having a grammage (basis weight) normally less than 40 g/m2.

Linen Paper
Paper with a finish that resembles linen cloth.

Linear Paper
A watermarked sheet with lines to guide the user.

Liner
A creased fiberboard sheet inserted as a sleeve in a container and covering all side walls. Used to provide extra stacking strength or cushioning. Also used as a short hand for "linerboard" or facing."

Linerboard
The inner and outer layers of paper that form the wall of a corrugated board.

Litmus Paper
An absorbent paper saturated with, litmus, a water-soluble dye extracted from certain lichens. The resulting piece of paper becomes a pH indicator, used to test materials for acidity. Blue litmus paper turns red under acidic conditions and red litmus paper turns blue under basic conditions, the color change occurring over the pH range 4.5-8.3 (at 25°C).

M
Manifold Paper
A light weight bond paper used for making carbon or manifold copies or for airmail correspondence.

Manila
A semi-bleached chemical sulfate paper. Not as strong as Kraft, but have better printing qualities.

Mechanical Paper
This paper contains mechanical pulp, thermomechanical pulp (TMP) or chemithermo-mechanical pulp (CTMP) and also chemical pulp. The shares of chemical and mechanical pulp vary depending on the application. Highly mechanical papers such as newsprint tend to yellow more rapidly if exposed to light and oxygen than woodfree papers so that they are mainly used for short-lived products. In printing papers the mechanical pulp improves opacity.

Metalization Base Paper
Paper used for very high vacuum deposition. Metals are vaporized at low temperature but very high vacuum and deposited on paper. Base paper is light weight, no conductive particles and no pin holes.

MF
Machine finished. Smooth paper calendered on the paper machine.

MG
Machine glazed. Paper with a glossy finish on one side produced on the paper machine by a Yankee cylinder.

Millboard
A thick, dense, homogeneous board, for book production, made generally from wastepaper, on a special board making machine one sheet at a time. Used in binding case bound books, ledgers etc. as binders’ boards.

N
Newsprint
A paper manufactured mostly from mechanical pulps specifically for the printing of newspaper. Pulp and Paper Product Council provides the following definition for newsprint. A general term used to describe paper between 40 g/m2 and 57 g/m2 generally used in the publication of newspapers. The furnish is largely mechanical wood pulp with some chemical wood pulp.

O
Offset Paper
Also known as book paper. General description of any paper primarily suited for offset printing. Can be coated or uncoated. Characterized by strength, dimensional stability, lack of curl and freedom from foreign surface material. Finish can be vellum or smooth.

P
Packaging Paper
A paper or paperboard used for wrapping or packing good.

Paperboard
A heavy weight, thick, rigid and single or multi-layer sheet. What differentiates paperboard from paper is the weight of the sheet. If paperboard is very heavy it is called Board. Paper heavier than 150 gram per meter square are normally called Paperboard and paperboard heavier than 500 gram per meter square are called board.

Photographic Paper
The base paper used for the production of photographic papers is a dimensionally stable, chemically neutral chemical pulp paper with wet strength properties, that must be free from contaminants. Today papers are coated on both sides with a thin polyethylene film. The cooking prevents chemicals and water entering the paper during development. This also permits shorter rinsing and drying cycles.

Poly Extrusion Paper
Paper used for plastic extrusion. Hot melted plastic is applied at the paper surface, so the base paper should be able to withstand heat.

Postcard Board
Postcard board is either slightly mechanical or woodfree and calendered.

Post-Consumer Waste Paper
Waste paper materials recovered after being used by consumers.

Poster Paper
Poster paper is a highly mechanical, highly filled, mostly coloured paper that has been made weather resistant by sizing.

Pre-Consumer Waste Paper
Paper recovered after the papermaking process, but before used by a consumer.

Pressure Sensitive Coated Paper
Paper coated with a self-adhesive material which in dry form (solvent free) is permanently tacky at room temperature. A bond with the receiving surface may be formed by the application of pressure (e.g. by the finger or hand). A permanent adhesive is characterized by relatively high ultimate adhesion and a removable adhesive by low ultimate adhesion. Until the time of application, the adhesive surface should be covered by a suitable release coated paper.

Publishing Paper
On-machine coated printing paper. Suitable for color printing or toning with low grid number or single color printing. Our products in this category includes: Wood-free printing and writing paper, Ivory wood-free printing and writing paper.

Pulp Board
Also known as Printers’ Board, this grade is made from a single web of pulp on a paper making machine, and is produced in various substances. Used for index cards and other general products, these boards may be white or colored.

R
Rag Paper
Today rag paper is mostly made from vegetable fibres consisting of cellulose, such as cotton, linen, hemp and ramie. Rags are the most precious raw material for the papermaker. Rag papers and rag-containing papers with admixtures of chemical pulp are used for banknotes, deeds, documents, books of account, maps and copperplate engravings and as elegant writing papers. They are also used for special technical applications.

Recovered Paper
Paper recovered for recycling into new paper products. Recovered paper can be collected from industrial sources (scraps, transport packaging, unsold newspapers...) or from household collections (old newspapers and magazines, household packaging).

Recovered Paper Grades
Recovered paper sorted by types in order to be recycled by paper mills. Specific grades are used by paper mills, in order to produce different types of paper and boards.

Release Paper
Release paper is used to prevent the sticking of glue, paste or other adhesive substances. Coating paper with silicone yields papers with a surface that prevents adhesion of most substances. Application: cover material for self-adhesive papers or films, e.g. in label production.

Roofing Paper
Board that is impregnated with tar, bitumen and/or natural asphalt.

S
Safety Paper
Papers with a special protection against abusive imitation. The safeguards used during the production of the paper - some of them chemicals are secret.

Sanitary Tissue Paper
Tissue is a sanitary paper made from chemical or waste paper pulp, sometimes with the admixture of mechanical pulp. It has a closed structure and is only slightly creped. It is so thin that it is hardly used in a single layer. Depending on the requirements the number of layers is multiplied. Creping is made at a dryness content of more than 90 %. The dry creping (unlike with sanitary crepe papers) and the low grammage of a single tissue layer result in a high softness of the tissue products. For consumer products it is normally combined in two or more layers. The flexible and highly absorbent product [is mainly produced from chemical pulp and/or DIP - sometimes also with admixture of groundwood pulp] can also be provided with wet strength. Applications: facial tissues, paper handkerchiefs, napkins, kitchen rolls, paper towels, toilet paper.

Security paper
Paper which includes identification features such as metallic strips and watermarks to assist in detecting fraud and to prevent counterfeiting.

Self Adhesive paper
Used essentially for labeling purposes, this grade has a self-adhesive coating on one side and a surface suitable for printing on the other. The adhesive is protected by a laminate which enables the sheet to be fed through printers or printing machines, the laminate subsequently being stripped when the label is applied

Silicon Treated Paper
A strong paper with a glazed finish that is treated with silicones on one side. This produces a release quality that is necessary for the liners used for pressure sensitive paper.

Single Faced Corrugated Board
Corrugated fiberboard consisting of two layers, one of fluted paper and one of facing.

Sized Paper
Sizing reduces the water absorbency of the paper and thus creates the condition for the writability with ink. Sized paper is also used for many other purposes (printing, coating, gluing, etc.), and the sizing agents must fulfil a wide range of tasks. For instance, they control the water absorbency and increase the ability to retain water and ink (pick resistance).

Solid Fiberboard
Collective term for all solid board grades.

Specialty Paper
The group of specialty papers comprises numerous paper grades, each characterized by particular properties. These properties often require special raw materials.

Stamp Paper
Paper used for printing postal stamp. Paper should have good printability, high strength, good glueability, permanence and high dimensional stability.

Strawboard
Board made from partially cooked straw, bagasse or grass or a mixture of these.

Surface-Sized
Paper that has been treated with starch or other sizing material at the size press of the paper machine. This term is used interchangeably with the term "tub-sized", although tub-size more properly refers to surface sizing applied as a separate operation where the paper is immersed in a tub of sizing (starch or glue), after which it passes between squeeze rolls and is air dried.

Super Art Paper
Highest grade of art paper with double or triple coating. Coat weight of 25g/m2 per side, with gloss level over 80%, surface feels smooth and shiny, superb printing quality, suitable for high-quality picture books, product catalogues, and refined printing products..

Synthetic Fiber Paper
Papers made from synthetic fibers such as polyamide and polyester, from viscose staple fiber or sometimes also with fillers. The fibers are mainly held together by binders. The durable synthetic fiber papers are used for maps and highly important documents such as driving licenses or vehicle registration books.

T
Tea Bag Paper
Used to pack tea leaves. Paper should not have any impurities. It should have high liquid permeability and should withstand boiling water.

Technical Paper
Variety of medium-grammage papers used in different industrial purposes.

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.

Thermal Paper
Any paper with a heat-sensitive coating on which an image can be produced by the application of heat.

Thin Paper
Includes carbonizing, cigarette, bible, air mail and similar papers.

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.

Transparent Paper
Extended and particularly careful grinding of high quality fibres (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.

Twisting Paper
A paper of high tensile strength in the machine direction which is cut into narrow widths and spun or twisted into yarn or twine.

U
Union Kraft
A packaging material comprising two layers of Kraft paper bonded together by means of a laminate that is resistant to the transmission of water in liquid or vapor form. E.g. bitumen or plastic.

Unglazed Paper
Un-calendered paper.

Un-sized Paper
A paper which has not been sized.

V
Vegetable Parchment
Paper that has acquired, by the action of sulfuric acid, a continuous texture. It offers high resistance to disintegration by water and grease.

W
Wadding
A single or multi-layer loosely matted fiber pad made from chemical pulp and used in packaging, thermal insulation and /or acoustical applications. It is also used in diaper and as absorbent material in other sanitary products.

Wall Paper
A paper used for wall covering. Also known as hanging paper.

Water-Color Paper
A medium weight, hard sized, coarse surface paper, suitable for painting with water based colors.

Water Resistant Paper
Paper which has been impregnated, coated or laminated to resist the penetration of water.

Waterleaf
A paper with little or no sizing, like blotter, making it very absorbent. If dampening is desired, this paper can be sprayed with an atomizer.

Waxed Paper
Almost woodfree paper that are impregnated with paraffin, wax or wax/paraffin/plastic mixtures. With the appropriate saturation agent and process the product may be tailored for specific applications, e.g. packaging of bread or sweets or wrapping razor blades.

Wet Strength Paper
A chemically treated paper strong enough to withstand tear, rupture or falling apart when saturated with water.

White Top Liner
A two-ply sheet comprised of one bleached and one unbleached layer.

Wrapper
The materials, consisting usually of paper or paperboard, sometimes with treatment for moisture barrier properties, which are used to protect the roll or pile form damage.

Writing Paper
Uncoated paper that is suitable for writing with ink on both sides. The writing must neither bleed nor strike through and suitable for printing. It can be wood free or mechanical, depending on the intended purpose.  

Yellow Pages
Used for telephone directory advertising. Paper used for this needs to have high bulk (1.1 to 1.2), high tensile strength of about 2 kg/15 mm in MD and good opacity (90%) so that the fine print made on thin paper like 40 gsm would be readable on both side. Excellent reel build up is required for smooth feeding during printing. This requires every uniform profile of bulk, gsm, caliper, moisture etc.