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 North America's #1 Resource for Paper Grade and Company InformationThursday, May 2, 2024  
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C1S
Coated one side.
C2S
Coated two sides.
cabinet
Announcement cards, correspondence cards, cut size cards, envelopes and stationery are packed in cartons referred to as cabinets.
calcium carbonate
(CaCo3) - A chemical compound used as a filler and as a coating pigment.
calcium sulphate
A chemical compound (general formula CASO4H2O) used as a filler.
calcium sulphite
CaSo3 - Chemical used as a filler.
calender
An assembly of rolls which impart a final finish to paper. Paper is passed through the vertical stack of calender rolls and is progressively smoothed and compacted as it passes through the stack. Process imparts gloss to the paper surface. (See nip).
calender board
Patent coated or clay coated board on which calenders and displays are mounted. Stiffness and warp-resistance are principal qualities.
calender crushed
Paper that has been crushed in the calendering process.
calender cuts
Marks left in paper by calendering.
calender dyed
Same as calender colored. Paper or paperboard that has been colored or stained at the calender stack. Color, transferred from the calender rolls to the paper, may be on one or both sides of the sheet.
calender finish
Type of finish applied by calendering.
calender rolls
A set or stack of horizontal cast iron rolls at the end of the paper machine. The web of paper is passed between the rolls to increase the smoothness and gloss of the surface.
calender sizing
Sizing applied to sheet during calendering.
calender stack
Sheet or cast iron rolls on a paper machine to level the paper and give it a smooth finish.
calender vellum finish
Extra smooth vellum on the surface of the paper which is provided by the calender rolls.
calendering
Process of passing the web of paper between polished metal rolls to increase gloss and smoothness.
caliper
The thickness of a sheet measured under specified conditions. It is usually expressed in thousandths of an inch (points or mils). For the explanation of the test to determine the caliper thickness of paper or board, see Chapter 6.
capacity
The potential output of a production unit under full operation. In the primary paper industry, the capacity of a machine or mill is usually stated in terms of tons per day or tons per year. The capacity of other type facilities may be expressed in such units as pounds, square feet, copies and pieces.
car signboard
A board used for outdoor advertising.
carbon paper
Paper coated with carbon inks which are released under pressure or impact in making duplicate copies with pencil, pen, typewriter and business machines. It is lightweight, from four to 28 lbs. with basic size of 24" x 30"/500 sheets and may be coated one or both sides
carbon pattern
Layout of carbon coating in a sheet of carbon paper which is not all-over coated.
carbon release
Image transfers from ply-to-ply by means of carbon interleaves of carbon coating sometimes called carbonization.
carbon stop
Narrow or short sheet of carbon in a form.
carbonizing paper
Lightweight base stock manufactured specifically to be converted into carbon paper.
carbonless paper
Paper that is treated or coated so that it will generate a copy under pressure.
card forms
Three sizes are considered standard: 3" x 5", 4" x 6", and 5" x 8" since they cut without waste from standard sizes of index bristol. A minimum of 2/10" margin is allowed for adequate gripper and binding space.
cardboard
A general term which usually refers to a sheet more than .006" in thickness. Used where stiffness is the most important requirement. Usually made from waste paper.
carload lot
A quantity of paper in rolls or skids to make up a full freight carload, usually 36,000 to 100,000 pounds. Also refers to a price category.
carton liner paper
Papers--greaseproof, glassine or waxed-- to line cartons containing cereals, crackers or other food products to protect contents from contamination.
cartons
A general term used to indicate a corrugated shipping container, a folding box or a rigid set-up box.
casein
Protein derived from skim milk and used in the sizing of paper and as an adhesive in the manufacture of coated papers.
cast-coated paper
Paper or board that is coated by allowing the coating to harden while in contact with a chromium polished surface. This results in a patent leather-like gloss. Cast coated papers are the glossiest of all coated papers.
cast-coating
In the process of cast-coating papers, the coated paper is pressed against a solid, highly polished chrome surface while the coating is in a plastic condition. The gloss of the drum is thereby cast into the coated surface. After drying, the coated finish is similar to the surface it has been in contact with during drying. Cast coated papers possess high bulk and high ink absorbing qualities since the mirror like finish is obtained without calendering.
CB
Coated back (carbonless paper).
CC1S
Cast-coated one side.
cellulose
The predominant material used in the manufacture of all grades of paper and paperboard. It is a carbohydrate, white in color, consisting of 44.4% carbon, 6.2% hydrogen and 49.4% oxygen. Cellulose is the preponderant component of all vegetable tissues and fibers and is the most important abundant organic material on earth.
CF
Coated front (carbonless papers).
CFB
Coated front and back (carbonless papers).
chain marks
Also called chain lines. Watermarks in paper that resemble impressions of a chain, running parallel to the grain, approximately one inch apart. These watermark lines are found in laid papers. (See laid).
chalking
Improper drying of ink. Ink vehicle has been absorbed too rapidly into the paper.
chart paper
Smooth surfaced paper made for chart and map printing, usually printed by offset litho.
chemical pulp
Pulp that has been obtained from wood that has been cooked with various chemicals.
china clay
A term applied to beneficiated kaolin (clay). (See clay).
Chinese character pattern
Style of blockout pattern.
chipboard
Low density board made from waste paper, in thicknesses of .006 and heavier.
chopper fold
Also called cross fold or right angle fold. This fold can be made following the first parallel fold and at right angles to it. It produces signatures that are 16-page multiples of the number of webs in the press.
chucks
Blocks inserted at the ends of cores to support rolls of paper on the roll stand.
clamp marks
Marks in sheets of paper caused by the clamps which hold lifts of paper in position on a guillotine cutting machine.
clay
General term for a natural fine-grained material, kaolin, which is used as filler and as coating pigments in paper manufacture.
clearedge carbon
Carbon paper with a narrow strip along one or both edges to provide a clean margin for handling or gluing.
close formation
Uniform density in a sheet of paper.
cloth finish
Surface finish produced by pressing the weave of cloth such as linen or burlap against the paper during manufacture.
cloth-lined paper
Paper combined with cloth, one or two sides.
cloud finish
An effect obtained by dropping white pulp on a web of colored paper.
cloudy formation
Opposite of close formation. Indicates unevenness and lack of uniformity of fiber structure. (See wild).
coated
Refers to paper or paperboard that has been coated to improve printability or appearance. Clay (kaolin) is predominantly used and may be applied during the manufacturing process or on an off-machine coater. Paper may be coated one side (C1S) or two sides (C2S).
coated free sheet
Coated paper containing 10% or less of mechanical pulp.
coated groundwood
Coated paper containing more than 10% mechanical pulp.
coated offset
A C2S paper with high resistance to picking and suitable for offset printing. Available in glossy and dull, embossed and matte finishes, coated offset papers generally do not develop as high a finish as their letterpress or gravure counterparts since the latter possesses a lower percentage of binder in the coating.
coated seconds
Paper or paperboard inferior to desired quality, but still usable. Usually sold at lower prices (See seconds).
coated tough check
Coated 2-sides tagboard. Basic size: 22" x 28". Standard thicknesses: 3 ply (.012), 4 ply (.018) and 6 ply (.024).
coating
Describes the layer of mixed substances such as clays and adhesives that are applied to the surface of paper or paperboard. The word also is used to describe the act of applying the formula to the surface of the paper or paperboard.
cockle
A puckered condition of a sheet resulting from non-uniform drying and shrinking. In most cases the cockle is not desired but some high quality papers are made specifically to have a cockle.
cold spot carbonizing ink
Material coated on backs of forms selectively. Usually an ink which can be applied cold to normal printing equipment.
collotype paper
A good quality printing paper, sufficiently durable to withstand excess moisture from the collotype printing process.
color control bar
The GATF Color Control Bar. A composite series of offset color control bars that may be used by platemakers and printers to standardize proofing of colors.
color correction
Technically, any method of correcting color photographs, color prints or color plates.
color fastness
Capacity of dyed paper to retain its original color or to resist fading and change through influences such as heat, light and use.
color key
(3M Co. trademark)-Unlaminated overlay proof with each color on an individual piece of acetate.
color perception
The eye can distinguish only three kinds of color difference or variation according to Grassman's First Law: 1) Hue--the attribute of visual sensation that distinguishes one color from another; 2) Brightness--by which color is perceived in a position on a dark-to-light scale, meaning dark to light tones. This attribute is also called luminosity or tone value; and 3) Saturation--by which the eye perceives, in addition to hue, the presence or absence of gray. Saturation is also referred to as purity or intensity.
color proofs
See progressive proofs.
color reproduction guide
The GATF Color Reproduction Guide. When reproducing on plates the color reproduction guide simplifies the procedures for making and screening full color subjects for the individual plant's ink, paper and printing variables. The Guide is made of four rows of 10 color blocks plus white. Each row has 1/4 the tint value of the next higher row. The screen ruling is 150-line. The complete guide is on 81/2" x 1" film sheet, either positive or negative
color standard
Colored paper and ink commonly used. Standard color sequence in sets: white, canary, pink, goldenrod, green, and buff. Additional parts may be salmon and white.
color transparency
Full color positive image, rendered in natural colors on a transparent support.
colorimetry
Using an instrument called a colorimeter, a given solid color may be quantified by analyzing physical color data and by treating the results so they apply to color as we see it and use it in practice. Most colorimeters measure an area of at least one-half inch.
combination plate
Halftone and line copy combined on one plate and etched for both line and halftone depth.
combination run
Two or more print jobs handled together to effect savings.
commercial match
Manufacturing a paper to meet specifications of and match a sample of paper provided to the manufacturer.
commodity papers
Term used to classify average qualities of bond, offset and related papers produced in high volume on big paper machines.
communication papers
General reference to those papers which are used in communications such as bond, writing and xerographic.
comprehensive
In printing, final proof pasted-up in the format that the printed piece will take.
compressibility
Commonly referred to as "cushion,'' this describes a paper's capacity to be squeezed (upon flat surfaces) and returned to its prior state. Important where stacks of paper are placed under compression.
computer output paper
Converted grade of writing paper exhibiting strength and good printing surface. Usually called "form bond."
conditioning
Allowing paper to sit long enough for it to adjust to the surrounding atmosphere until its moisture content is equal to atmospheric moisture content. This process provides for optimum performance on press.
coniferous
Trees which bear cones as their fruit, are usually evergreen and classified as softwoods, such as pines and firs. They are the source of fiber for sulphite and sulphate pulps.
construction paper
Type of heavy paper, manufactured in a wide range of colors. This grade is used most often in elementary schools for cutouts and other artwork. Basic size: 24" x 36". Basis weight: 40 to 80 lbs.
containerboard
Linerboard and corrugated medium used in the manufacture of shipping containers.
continuous
Designates paper in rolls usually manufactured for end-use production operations from the web.
continuous envelopes
Envelopes in continuous form, suitable for addressing, in piggy-back or patch pocket construction.
continuous form
Form manufactured from a continuous web, not slit into separate parts perpendicular to the web prior to its use.
continuous tone
Tonal gradation without use of halftone dots.
contrast
Degree of difference between highlights and dark portions of a photograph or of prepared art that embodies a range of tones. Example, black to light gray.
conversion
Term designates the transformation of paper or paperboard after it comes off the manufacturing machine, to a variety of forms such as envelopes, bags, boxes and containers. Also, an offset plate that has been converted from a relief image plate.
conversion coating
Describes the act of coating paper after it is off the papermaking machine. Conversion coating is now generally referred to as off-machine coating.
converter
Company that converts paper from its original form to usable products including envelopes, boxed writing papers, bags, adding machine rolls, coated papers and gummed tapes.
converting paper
Paper changed from its original state into a new product. Examples include envelopes and gummed tape.
cook
In papermaking, the act of treating raw material with chemicals under pressure and extreme heat to produce pulp from which paper can be made.
copper number
Test to identify the presence of oxidized cellulose, meaning the break-down of cellulose leaving impurities like lignin which start early deterioration of paper. The higher the copper number--up to 100C the more degradation is necessary.
copy dot
Reproduction of halftone original on line copy without rescreening.
copy paper
Paper used in photocopying machines.
cord
Unit of measurement of pulpwood defined as a pile containing 128 cubic feet of wood, stacked eight feet long, four feet wide and four feet high.
core
Shaft in center of a roll around which the web of paper is unwound. Cores are either metal or cardboard; either returnable or disposable.
core cards
Record of specifications included by the manufacturer in each shipment of paper.
core waste
Refers to paper left on a roll after most of the paper has been used.
corner cut
Diagonal cut on one corner of a business form, at one end of the cross perforation in a continuous carbon where a tongue is formed when the form is burst. Also, when the diagonal cut is placed at one corner of register form.
corner stub
Used primarily on continuous forms to assist in manual carbon extraction when the form has been burst.
correspondence papers
Writing papers with attractive finishes. Good finish and good writing characteristics are principal qualities.
cotton fibers
For papermaking, selected new cotton cuttings acquired from the textile industries. They are free of synthetic fibers and are the principal source of cotton fibers used in the manufacture of cotton content papers. Basic cotton linters are also used in the manufacture of pulp.
cotton linters
Short cotton fibers remaining on cotton seed after the ginning process. Used in the manufacture of cotton fiber content papers and as a raw material from which cellulose is derived.
cover papers
Strong, heavy paper suitable for covers of publications such as brochures. Available in various colors.
crackle
The noise produced from a sheet of paper when it is shaken or handled roughly. Desirable quality in some bonds, but undesirable in many papers.
crash finish
Paper embossed at the mill to resemble coarse linen.
crash perforation
Perforation cut through all plies of a collated set of business forms, normally performed on the collator.
crash printing
Impressing an image relief pressure. The image, on parts of the business forms set other than the original is carried through by carbon or carbonless paper.
crayon paper
Paper used for crayons or watercolor. It is a heavy board, either white or tinted, with a glazed surface on one side and rough finish on the other.
crimp
Temporary form fastening consisting of a finger of paper cut through the plies being fastened.
crimping
Creasing the bindery edges of ledger sheets to help them open more freely.
crocking
Rubbing off dye from the surface of paper.
cromalin proofs
These proofs are not printed on a press. They are created chemically. It is a facsimile of a full color halftone made using the dyes on a very glossy paper. Cromalin is a trade name of E.I. du Pont deNemours.
cropping
Trimming original photographs to smaller size.
cross direction
Dimension of a sheet of paper at right angles to the direction of the grain.
cross perforations
In continuous forms, perforations cutting at right angles to the web direction.
curl
Waviness, roll or curvature sometimes at the edge of the sheet which can occur in the paper mill, in the printer's storeroom, on the printer's press, or in the bindery. Curl is usually associated with improper balance of moisture within the sheet, uneven drying coming off press. Curl can also be the result of fiber orientation within the sheet, internal stresses, improper refining of pulp, or mechanical stresses during manufacture or printing. Three types of curl can plague offset printers: 1) moisture curl, traceable to a change in humidity occurring always with the grain; 2) initial moisture curl, occurring the moment one side of the sheet of paper is moistened; and 3) delayed curl, occurring after moisture applied to one side of a sheet has evaporated or diffused through the body of paper.
curved plate
Letterpress plate that is backed-up and curved to fit a rotary press.
cut
In letterpress, photo-engraving of any kind.
cut forms
Forms delivered as individual sheets.
cut off
Print length in web printing corresponding to the circumference of the plate cylinder.
cut score
In die cutting, a sharp-edged knife usually several thousandths of an inch lower than the cutting rules in a die, made to cut part way into board for folding purposes.
cut size
Refers to business and writing papers that have been rotary trimmed or guillotine cut to dimensions of less than 17" x 22" in size. The most common cut-size is 8 1/2" x 11". Other common sizes are 8 1/2" x 14" and 11" x 17".
cut to register
Term used for watermark papers to indicate that the paper has been cut in a manner that allows the watermark to appear in a predetermined position on the finished sheet. (See watermark).
cutter
Machine that cuts rolls of paper into sheets preparatory to further trimming to finished basic size. Also called a cross cutter or square cutter.
cutter broke
Waste and trimmed edges from the cutting operation. This broke is reused as pulp for the manufacture of paper. (See broke).
cutter dust
Refers to small particles of fiber and paper dust that result from the cutting operation. This dust adheres to edges of paper and could work itself into the pile of paper and onto the paper surface to cause later troubles during printing.
cylinder board
Paperboard made on a cylinder machine.
cylinder dried
Same as machine dried. Describes any paper which is dried during manufacture by passing it against and over heated iron rolls.
cylinder gap
In printing, space between the ends of a plate wrapped around the press cylinders.
cylinder machine
Same as vat machine. It is a type of paper machine that makes paper by partially immersing rotating cylinders in vats of pulp stock. Paper is formed as the cylinder turns and water drains from it.
cylindrical casting
Stereotyped cast into a curved mat to produce a casting suitable for use on a rotary press.
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