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In binding, staples (formed from a continuous wire) driven through the back fold of a booklet, clinched in the middle, and enabling the booklet to open out flat. The same type of binding can be accomplished with a stapler, using pre-formed staples.
Used mainly as bank checks and other legal documents. Safety paper is specially treated to prevent erasure, alteration or duplication of any writing or printing on its surface. A treated paper which when writing or printing on the paper is altered, the alteration attempt will leave a noticeable smudge, discoloration, or other evidence of change, this type of paper might be used for making checks or other documents to discourage such alterations.
Set of forms bound into a book, usually for ease of writing.
A smooth, delicately embossed finished paper with sheen. Also called silk. A finish lacking gloss, generally intermediate to a matte finish and a dull finish. See gloss.
A device on the paper machine which screens paper fibers from water, to save pulp which might otherwise be lost to the sewer.
Foreign materials from the paper making or converting operations deposited on the web after it is formed, and can be starch or coating materials broken loose from the sheet, and redeposited. Scale in the printing operation can adhere to the blanket and transfer to the plate causing defects in the printed piece. The terms calendar scale and coating scale are often used in relation to this defect, implying where in the paper making process the scale was deposited on the sheet.
In printing plate preparation, an electronic method, based on point by point scanning of color separations and tonal gradations under computer control.
To impress paper with a rule for the purpose of making folding easier. The process and the resulting line mechanically impressed into a heavy sheet of paper or board, to pre-stress the fold line and facilitate folding or improve the appearance of the fold. Most effectively done with the grain of the paper, and is absolutely necessary with heavier basis weight paper.
SCRAP IN ROLL
Trim or scrap paper wound into the roll of paper. The scrap may or may not be protruding from the ends of the roll.
In color reproduction, the halftone screens are rotated with relation to one another, to avoid undesirable moir' patterns. The angles usually used are black 45 degrees, magenta 75 degrees, yellow 90 degrees, and cyan 105 degrees.
A form of porous printing. The process by which the image area is created by forcing ink through a "screen" or mesh, created by blocking off all areas in the "screen" where no image is to be formed; an example would be silk screen printing of T-shirts. Mimeograph printing is also another form of porous (screen) printing.
The number of lines or dots per inch on a halftone screen. See screens.
Rejected materials, such as knots, shives and large bark particles, from the screening operations of pulp suspensions in a pulp mill.
Halftone illustrations. The ruling (usually expressed as lines per inch, i.e., 120 lpi, 133 lpi, 150 lpi) used to determine the dots per unit area in developing tonal values in the printed piece. Up to the point of "dot gain," the higher the screen, the finer the lines per inch, the greater the fineness of detail in the printed piece. See stochastic screening.
The disrupted appearance of an ink film as a result of abrasion to either the wet or dry ink film.
A term describing the condition resulting when any non-image area of the plate tends to take ink (any cause); when this starts to occur in offset lithography, it is said that the plate is "catching up"; can also be called toning.
Is a defect in the web, normally running at approximate right angles to the machine direction and is seen as a light streak when viewed by transmitted light. Point of origin is usually an article of machine clothing, a wire or a felt, that is seamed. The distance from one defect to the other is a clue as to the origin of the mark.
Any type of paper and paperboard fiber obtained from wastepaper and other used reclaimable fiber sources. A term used for wastepaper. Recycled into the paper making process.
Lower-quality pulp made from waste paper and not directly from wood.
Booklet cover that matches the inside pages. Carbonless paper, where the colorless dyes and color developers are contained in the sheet or in the coating on one side of the sheet, and color is developed in sitsu (not a transfer of chemicals as in a mated system), by the action of an impact or writing instrument to release the colorless dyes.
A pulp produced by a mild chemical treatment followed by a mechanical defiberizing operation. A pulping process, not widely used in Fine Papers, that uses chemicals to assist a mechanical pulping process, and gives a pulp similar to chemical pulp.
The act of separating (dividing) the colors of an original into its component colors (yellow, magenta, cyan, black, and any spot colors); each record or negative is used for the production of a single color printing plate.
See color sequence.
Inks are said to be "set" when the ink film on a printed piece is immobile, though not fully dry, and can be handled without smudging/smearing.
The actual sewing through all the pages of a book which is to be case bound.
1) Also couch marks; defects which appear as a regular pattern, always when viewed by transmitted light and sometimes when viewed by direct light. Cause is usually some non-uniform water removal from the sheet of paper in the wet end of the paper machine, and takes the pattern of the equipment removing the water (such as a drilled hole suction couch roll). 2) Can also be intentional watermark patterning, using the dandy roll. See dandy roll.
Transferring or smearing of ink from freshly-printed sheets of paper to another surface (also called off-set). The transfer of ink from a printed sheet to another sheet in contact with it at the delivery end of a printing press and/ or during subsequent bindery operations.
Flat piece of any type of pulp, paper and paperboard that has a variety of characteristics, sizes and finishes.
Presses that print sheets instead of rolls. A printing process, where the paper is processed as sheets, as opposed to processing from a web (roll/ribbon). Ink-drying mechanisms can differ between the sheet-fed and web-fed offset lithography printing processes.
The smoothness of paper as measured by the Sheffield paper smoothness gauge, expressed as the rate of airflow between the measuring surface and the paper surface under specified conditions.
Uncooked wood particles which show up in the finished sheet; in groundwood pulps. bundles of fibers resulting from less than mechanical separation.
A press run which will produce a small quantity of books.
Visibility of printing on the reverse side of the paper. Also called strikethrough; the undesirable condition where the printing on the reverse side can be seen through the sheet under normal lighting. See opacity.
See tight edges.
A guide on sheet fed equipment to position the sheet sideways for the operation. On web fed equipment, this is called an edge guide.
A section of a book, folded ready for binding with other sections. "Sigs" usually range from 16-32 pages but could be as low as 4 and as high as 64. A folded sheet of printed paper usually a section of a book or magazine (or newspaper), ordinarily obtained by the folding of a single sheet into 4, 8, 16, or more pages. The term signature can also be applied to a printed flat sheet that is to be later folded into a multi-page document.
SILK SCREEN PRINTING
A form of porous printing. Originally, the porous material for making the screen was a silk fabric, thus the name. See screen printing.
Chemical byproducts of the wood-pulping process and other chemicals derived from wood.
1) structural curl is the bending of a sheet of paper around the grain direction. and is generally caused by differential moisture changes (cellulose fiber diameter changes) from one side of the sheet versus the other. 2) Wrap curl is the result of the sheet becoming "set" when wrapped around a core. It is always curl or bending perpendicular to the grain.
Non-fibrous materials used in papermaking to control the absorbency of paper. Rosin, starch, alum and gelatins are most commonly used. A water resisting material which is added to paper. See sizing.
Section of paper machine where surface treatments are applied to the sheet of paper to give it special qualities. Normally a pair of rolls toward the end of the dryer train between which the dry or partially dry web is passed, and into the nip of which a liquid, usually starch, is applied to impart strength to the sheet. The part of the paper machine that applies a surface size or treatment to the web of paper. See surface sizing.
The process by which gelatin rosin, starch or other synthetic substance is added to paper to provide resistance to the absorption of moisture or eliminating ink feathering and bleed through. Sizing added to the beater or vat of pulp is known as internal sizing. After a sheet is formed, it may be either surface sized (painted or brushed on the surface), or tub sized (immersed in a bath).
A treatment to improve the resistance to a liquid (particularly water) or vapor; surface or internal sizing. Sizing or waterproofness is generally measured as the time required for a water-based fluid or ink to penetrate from one surface of paper to the other, through the sheet. See size press, acid sizing or alkaline sizing.
A platform (usually 8 inches or more in height) which is supported by runners extending lengthwise of the skid. It is generally higher than a pallet and since it has no bottom platform, is not generally stacked. A skid is moved by means of a platform truck.
The formation of a dried layer on the surface of a fluid such as an ink or coating (like a paint), after a period of standing.
Refers to paper which has very little or no sizing, to resist moisture penetration; opposite of hard sized.
The opening in the headbox of the paper machine, where the furnish is uniformly forced out onto the wire for the web of paper to be formed.
Bacterial micro-organisms growing in the wet end of the paper machine system, that if left uncontrolled, can break loose and become a part of the paper web-usually a "slime" hole results. Normally controlled by slimicides or biocides, added to the wet end of the paper machine.
High concentration slurry (even semi- solid) of paper making or coating pigment in water.
An unevenly wound roll which is usually the result of loose winding; see telescoped roll.
A sharp knife (generally a sharp disc) which cuts paper into predetermined widths; if not properly set or maintained can give a poor, non-uniform, or dusty cut.
The accumulation of dust, primarily filler, fibers, or coating thrown off during the slitting operation, and remaining on or in the roll.
Cutting printed sheets or webs into two or more sections by means of cutting wheels on a press or folder.
The smearing of type or illustrations commonly at the trailing edge of a sheet fed paper.
A liquid mixture consisting of suspended fibers, fillers, coating pigments and other solid material in water or adhesive, used in papermaking process.
Pulp stock-water suspension thin enough to flow or pump through a pipeline, usually running about 1% to 6% consistency. Pulp Cellulose fibers mixed with water so it can be pumped.
An area of a blanket that is no longer firm and resilient, and that gives a light impression in the center of a well-printed area. Usually caused by physical damage of the blanket at impression.
The spreading of ink, usually due to abrasion or rubbing of freshly (not yet set) printed ink to adjacent areas of the paper surface.
The evenness or levelness of a paper surface which is measurable with special testing equipment. The texture of the surface of paper; also called finish. Generally determined with an instrument which measures the flow of air along the surface of a paper sample under standardized loading and air pressure conditions, i.e., the greater or faster the flow/ escape of air, the less smooth the surface.
1) The transfer of ink, usually due to abrasion or rubbing of a printed ink film, to an adjacent sheet or area (see smear) of the paper; occasionally is referred to as carbonizing. 2) In carbonless paper, the premature development of color (intended for producing the image), usually due to abrasion or pressure, and the breakage of microcapsules.
The binding of books by sewing the signatures together. The strongest of all binding processes.
Abbreviation for "Specifications for Non-heatset Advertising Printing"; a color proofing system to assure press to press, and run to run color constancy.
A process and the product resulting from the pulping of wood, using a sodium hydroxide (lye) solution, under conditions of high temperature and pressure; see kraft for the more widely used alkaline pulping process.
A book cover made of a heavy weight paper and glued or "perfect bound" to the body of the book.
Wood obtained from evergreen, cone-bearing species of trees, such as pines, spruces and hemlocks. This imparts the strength properties to the paper. Source of "longer" cellulose fibers for paper making, as extracted from coniferous or cone bearing trees.
Single-ply paperboard made from the same stock throughout the entire sheet structure.
An agricultural product and renewable resource that is receiving increased usage in the manufacture of printing inks, as a replacement for a portion on the petrochemical based solvents and oils. Soy oils have many of the characteristics of petroleum based oils, but are not as easily evaporated as the lower molecular weight solvents, and are more compatible with water (with implications for fountain solution interactions).
SPECIALTY PAPERS and BOARDS
This is a term applied to such grades as off-machine coated, laminated, impregnated, etc., as distinguished from printings and writings and other grades that do not require further processing. Specialty papers and boards are often the raw materials used by other industries.
An optical instrument to measure color or color differences from standard.
The complete range of rainbow-like colors (continuous), generally in the visible range of wavelengths, from short/blue to long/red.
Light reflected from a surface at exactly the same angle as the incident angle of the light; as a mirror reflects an image.
Used cooking liquor on a chemical pulp mill that is separated from the pulp after the cooking process. It contains lignin, resins and other substances extracted from the material being cooked.
The back or bound edge of a book. See backbone.
A joint made in a continuous sheet of paper with glue or adhesive tape when a break occurs in the web during winding or rewinding into a roll. Also called paster; the connection of a continuous web, such that later converting and printing operations can be performed satisfactorily. A splice is usually placed in the web during the winding process, when defective paper is removed or when material is added to complete a roll diameter or length. A web break, mis-register on the printing press, and damaged blankets due to excessive thickness are just three examples of a possible result of a "poor" splice. See butt splice.
Continuous roll of paper or cardboard rolled around a mandrel.
The printing with a hot melt composition (wax and pigment-origin ally carbon black) of only certain portions of the reverse side of the plies in a business form. Requires a special coated or uncoated paper, free of pin holes, that would allow unsatisfactory, unsightly points of carbonizing material to come through to the face (top side) of the sheet. The product resulting from carbonizing or spot carbonizing is also called a mechanical carbonless paper.
Premixed, semi or fully opaque printing inks used for exact color match, as in a corporate logo (Examples: Coca Cola red or John Deere green). Used in place of trying to match exact colors by the combination of 3 or 4 process colors. Can also add visual impact and reduce the process ink costs.
The high-pressure water jet used on the wet end of a paper machine to cut the wet web to the correct width. Also, one jet is adjusted to cut a leader sheet or tail on the wet web as it is fed from the wire to the wet presses, and expands the web width once it is fed through the machine.
Subject to Accumulation. Amount insufficient to meet minimum run requirements on paper machine.
See offset winding.
This is assumed to be 29.92 in. of mercury and 70 degrees Fahrenheit.
STAND ON END
Term referring to loading rolls for shipment in a poker chip fashion.
The perceived color of paper and the color of the printed piece are greatly influenced by the illuminating light. For all visual color matching, there is a suggested/ standard illuminating light.
Material made primarily from corn and potatoes that is used as a surface or internal additive to provide strength.
STARRED END (ROLL)
Observed by the "star" pattern radiating from the core to the outer wraps of a roll, cause can be a soft end on the roll, tightly wound paper above paper that is loosely wound, or just from a severe impact.
In the collation of signatures for a book, magazine or other publication, individual signatures may vary in moisture content, and after trimming, upon coming to equilibrium, give an uneven appearance to the edge- of the printed matter. This is always after time. This nonuniform edge, with some signature or group of pages protruding more than an adjacent signature is called a start.
A quality of paper alluding to its rigidity and resistance to bending and inflexibility. Property of paper to resist bending.
Conventional-screening technique gives fixed spacing (screen ruling) and variable sized dots for tonal value printing. Stochastic screening can give tonal values with both variable dot size/area and/or variably spaced dots. This is achieved by electronic media (computers) using digital imaging and laser exposure to achieve renderings approaching continuous tonal value photography, and no dot pattern. With no dot pattern, this eliminates undesirable rosette and moir' effects.
This refers to the wet pulp before it is fed onto a papermaking machine, or during the papermaking processes before it becomes a sheet of paper; contains around 99% water and 1% fiber. In graphic arts, stock means paper.
The treatment and modification of fibers to make them suitable for papermaking including beating and refining and the blending of fibrous and nonfibrous materials in the desired proportions for the papermaking furnish.
Standard sizes of paper or board. Examples are 8 x 11, 8 x 14, 11 x 17 in cut sizes and 17 x 22, 23 x 35 and 25 x 38 etc. for parent sizes.
See offset lithography.
See crash sequence.
A type of sheet feeding unit that allows several sheets of paper to lap each other to minimize the sudden acceleration or deceleration (start and stop) at the feed or delivery end of sheet fed equipment such as printing presses and sheeters.
The strength of a sheet of paper is dependent primarily upon the nature and amount M) of fiber used to make the paper; the test to measure strength is dependent upon the characteristic to be measured, and can include such properties or measurements as surface strength. burst, tear, tensile, or other.
The give of a sheet of paper as it undergoes tensile pressure. Describes the "give" to a sheet of paper when it is subjected to tensile pull.
1) In preparing lithographic plate making films, the placing of the negatives/ positives in the proper place on the page. 2) As a defect in lithographic printing, describes the condition when the ink rollers take water preferentially to the ink (the ink roller surface changes from oleophilic to hydrophilic). Usually occurs on metal ink rollers, but can occur in synthetic composition covered rollers.
See simple curl.
Occurs when water, adhesive, coating or some other tacky material gets in between layers or wraps of a roll, causing them to adhere to each other.
Synonymous with basis weight. Generally used with business papers measured on a 17" x 22" basic size.
SUBTRACTIVE PRIMARY COLORS
See primary colors.
An alkaline process of cooking wood. See kraft.
An alkaline pulp manufacturing process made by using wood chips cooked under pressure in a solution of sodium hydroxide and sodium sulfide. Also known as kraft process.
Paper pulp made from wood chips cooked under pressure in a solution of sodium hydroxide and sodium sulfide. Known as kraft.
Sulfite pulp is produced from wood chips that are cooked in an acidic liquor containing a high percentage of free sulfur dioxide. A process and the product resulting from the pulping of wood using acid (as oppose to the pulping processes. See kraft and soda.
Paper pulp made from wood chips cooked in an acid liquor solution of calcium, sodium, magnesium, or ammonia sulfite.
Auxiliary piece of equipment that gives paper a very smooth surface by passing it through a series of alternate metal and composition rolls, revolving with high speed and pressure. The calendering method using alternate steel/metal and resilient (filled) rolls, generally to obtain various levels of gloss. See calendaring.
SUPER FINE WRITING
Writing paper with smooth finish and close formation, made of sulfite and cotton fiber pulps.
Paper having undergone a coating process to one or both sides to improve the characteristics of its surface.
The surface application of material (generally in papermaking, a starch solution) to change its resistance to fluids; a cotton shirt or blouse may be surface sized from the laundry, i.e., it may have a starch application to give it "crispness" and resistance to moisture.
See chill rolls.
An abbreviation for Specifications for Web Offset Publicationsa color proofing system to assure press to press and run to run color constancy.
Sword shaped hygrometer that may be inserted into a pile of paper to determine its equilibrium moisture content, and for comparison with the surrounding air.
Any petroleum-based waterproof papers with a high tensile strength.