Pancyprian TS Graphic Arts III Π.Κ. key terms

The arrangement of individual pages on a large press sheet so that, once printed, folded and trimmed, the pages fall in the correct reading sequence in the finished signature.

A folded press sheet forming a section of a book or brochure; several gathered signatures make up the complete publication and determine binding and folding workflow.

The progressive outward shift of inner pages in a folded signature caused by paper thickness, compensated by shingling pages during imposition so trimmed margins stay equal.

Artwork extended beyond the final trim line so that slight cutting variation leaves no unprinted white edge on the finished product, typically 3 mm.

Short printed lines placed outside the finished page area that show the guillotine or die operator exactly where to cut the sheet after printing and folding.

A systematic automated check of a digital file before output, verifying fonts, images, colour space, resolution, bleed and page size to prevent production errors.

An ISO standard subset of PDF that restricts features unsuitable for print exchange, ensuring fonts are embedded, colour is defined and output intent is declared.

A PDF/X entry declaring the intended printing condition, such as a characterised reference print process, so the receiver can judge colour reproducibly.

A setting where a printed element does not knock out the background beneath it but prints on top, used for black text and to hide registration shifts.

A deliberate slight overlap or spread of adjacent colour areas so that small misregistration during printing does not reveal unprinted paper at their boundary.

The exact alignment of successive colour separations or printed sides on the sheet; poor registration produces visible colour fringes and blurred images.

Any deviation of one printed colour from its correct position relative to the others, caused by paper stretch, plate movement or feeder misalignment.

The preparatory work on a press before good copies are produced: mounting plates, setting ink and water balance, adjusting pressure and registering the sheet.

The critical offset relationship between ink and fountain solution on the plate; too much water emulsifies ink, too little causes scumming and plate contamination.

A dilute mixture of water, buffer, desensitising gum and wetting agents applied to the offset plate to keep non-image areas ink-repellent.

The imaged carrier in offset lithography; its ink-receptive image areas and water-receptive non-image areas transfer ink to the blanket, not directly to paper.

A rubber-covered cylinder in offset printing that receives ink from the plate and transfers it to the substrate, also absorbing some paper and pressure variation.

A lithographic process in which ink passes from plate to blanket to substrate, relying on the mutual repulsion of ink and water rather than physical relief.

The increase in apparent halftone dot size between file and printed sheet, caused by ink spread and paper absorption; measured with a densitometer for process control.

A reproduction technique that converts continuous-tone images into dots of varying size at fixed screen frequency, creating the illusion of tonal gradation.

The number of halftone dot lines per unit length, usually lines per centimetre or inch; finer rulings reproduce more detail but demand better paper and control.

A standard file describing how a device or printing condition renders colour, used by colour management software to convert colours between devices predictably.

The system of device profiles and rendering intents that translates colours between capture, display and print devices so that appearance stays consistent.

A rule chosen during colour conversion, such as perceptual or relative colorimetric, deciding how out-of-gamut colours and white points are mapped.

An instrument measuring the optical density of ink films or printed patches, used to control ink film thickness and monitor dot gain on press.

An instrument measuring reflected light across many wavelengths, giving spectral data from which colorimetric values and ink film thickness can be derived.

A numerical expression, commonly Delta E, of the perceptual distance between a measured colour and a reference, used to judge acceptability of printed work.

A representative sample of the expected printed result, produced digitally or by contract proofing, approved by the customer before production begins.

A fine pigmented powder used in electrophotographic digital printing that is attracted to a charged image and fused onto the substrate by heat and pressure.

The digital printing stage where heat and pressure melt toner particles into the paper surface, fixing the image and determining its gloss and rub resistance.

Non-impact printing directly from a digital file without a fixed image carrier, economical for short runs, variable data and fast turnaround.

A relief printing process using a flexible photopolymer plate and fluid ink, widely used for labels, flexible packaging and corrugated board.

A engraved ceramic roller in flexography whose cells meter a precise volume of ink onto the relief plate, controlling ink film thickness.

Cutting a shape from sheet material using a steel-rule forme mounted in a press, used for cartons, labels and complex outlines.

Pressing a linear indentation into board so it folds cleanly without cracking the coating or splitting the fibres along the fold line.

The cutting or creasing forme, typically a wooden base carrying steel rules, shaped to the required outline and mounted in a cutting press.

A binding method in which gathered signatures or leaves are trimmed at the spine and glued into a flexible cover, giving a flat square spine.

Any binding that joins leaves or signatures with glue rather than thread or wire, including perfect binding and side-glued padding.

Applying a thin plastic film to a printed sheet with heat or adhesive to protect the surface, add gloss or matt finish, and improve rigidity.

The mass of paper per unit area, expressed in grams per square metre, which determines stiffness, opacity and suitability for a given process.

The predominant direction of paper fibres from the paper machine, affecting folding, dimensional stability and how sheets behave in a press.

The unwanted build-up of paper dust, coating or ink on a blanket or plate during printing, which causes voids and hickeys in the image.

The transfer of wet ink from a printed sheet to the back of the next sheet in the delivery pile, prevented by anti-set-off spray or drying time.

Volatile organic compounds evaporating from inks, solvents and cleaning agents; a health and environmental concern requiring substitution, extraction and proper disposal.

A supplier document, in a standard sixteen-section format, giving hazard, handling, storage and emergency information for a chemical product used in the workshop.

A documented risk assessment of work with hazardous substances, identifying exposure routes, controls and monitoring needed to protect workers' health.

The priority order for waste management: prevent, reuse, recycle, recover energy, then dispose; it guides decisions about paper, ink and plate waste.

Physical or interlocked protection around moving machine parts such as rollers and cutting blades, preventing access to danger zones during operation.

Printed sheets wasted during make-ready and running, counted in production planning to calculate the true quantity of substrate and time a job requires.

Calculating a job price from substrate, ink, plates, machine time, labour, finishing and overheads, plus an allowance for spoilage and profit.

The planned system of procedures, checks and records that ensures printed work consistently meets the agreed specification before it reaches the customer.

The production document carrying the full specification of a job: substrate, colours, quantities, finishing, deadlines and special instructions for each department.