Glossary
UV Printing Glossary
A reference guide to the terminology used in industrial UV LED flatbed and roll-to-roll printing. Each term is explained in the context of SIGNRACER printing systems and production workflows.
- UV curing
- UV curing is the photochemical process in which UV light polymerizes a compatible ink or coating after deposition. The cured layer can normally be handled without evaporation-based drying; established local printing terminology may call this UV drying, but the mechanism is UV-triggered polymerization rather than air or heat drying.
- LED UV
- LED UV uses light-emitting diodes as the ultraviolet source for curing UV inks. It provides instant on/off control, lower heat output, and longer operational life compared to mercury vapor lamps.
- inkjet
- Inkjet is a digital printing method that ejects microscopic ink droplets from printhead nozzles onto a substrate. It requires no plates, supporting short runs, customization, and rapid job changes.
- flatbed
- Flatbed describes a UV printer with a stationary surface where rigid or flexible substrates are placed for direct printing. The printheads move over the fixed media, applying UV ink across the surface.
- roll-to-roll
- Roll-to-roll is a UV printing method for continuous production on flexible media, where material feeds from a supply roll, is printed, and rewound onto a take-up roll. It supports substrates such as vinyl, banners, textiles, and films.
- hybrid UV printer
- A hybrid UV printer handles both rigid sheets and roll media through a shared transport path, typically using a conveyor vacuum belt plus roll-feed and take-up hardware. The supported media dimensions, weight, thickness, and roll configuration depend on the model.
- grayscale printing
- Grayscale printing in UV inkjet uses variable droplet sizes to produce smooth gradients and detailed images. By deploying multiple droplet sizes instead of a single fixed size, it can achieve higher image quality.
- digital masking
- Digital masking prints a temporary UV-curable resist directly from digital artwork onto selected areas of a metal part. After curing, the part can be brushed, ground, sandblasted, or otherwise finished, then the mask is removed with the validated wash process to reveal the protected pattern.
- Direct-to-object printing
- Direct-to-object printing refers to printing images, text, or graphics directly onto three-dimensional or irregularly shaped substrates. This method can eliminate the need for labels or transfers.
- DPI (dots per inch)
- DPI (dots per inch) measures the resolution of a printed image by quantifying how many individual ink dots the printer places within a linear inch. Higher DPI settings can produce sharper details and smoother gradients.
- Delayed curing
- Delayed curing is a UV printing technique where the UV LED lamps activate after a short interval, allowing ink droplets to spread and blend before fixation. Curing timing can be adjusted to influence gloss, adhesion, and color vibrancy.
- Triple-row curing
- Triple-row curing is SIGNRACER terminology for the widest selectable LED UV curing configuration on relevant platforms. Where specified, it provides a 210 mm curing width at 16 W/cm²; it is distinct from a triple-row printhead arrangement, and availability depends on the printer model.
- Variable drop size
- Variable drop size refers to the printer's ability to eject ink droplets of different volumes from the printhead nozzles. This feature can produce smoother gradients, finer details, and optimized ink coverage.
- Multi-drop technology
- Multi-drop technology enables the printhead to release multiple ink droplets in rapid succession at each pixel location, layering ink for richer color and smoother tones. This approach can achieve high-density prints and subtle color transitions.
- printhead
- The printhead is the core component in a UV LED flatbed printer that ejects microscopic droplets of UV ink onto the substrate. It contains multiple nozzles that control droplet size and placement, directly affecting image resolution and print quality.
- nozzle
- A nozzle is a tiny opening within the printhead through which individual droplets of UV ink are ejected. The size, cleanliness, and condition of nozzles affect droplet size and print quality.
- carriage
- The carriage is the moving platform in a UV LED flatbed printer that transports the printhead assembly across the substrate. Carriage stability and speed affect print quality, throughput, and alignment.
- linear motor
- A linear motor is a drive system that moves the print carriage along a straight path without belts or gears. Its direct, frictionless motion enables precise positioning for high-resolution printing.
- encoder
- An encoder is a sensor that monitors carriage or media position by converting mechanical motion into electronic signals. This real-time feedback enables accurate printhead placement.
- vacuum table
- A vacuum table uses controlled suction to hold substrates flat during printing. This prevents movement or warping, supporting accurate image placement and sharp registration.
- registration pins
- Registration pins are mechanical alignment guides on the printbed that position substrates consistently. They support repeatable placement for multi-layer, double-sided, or multi-pass printing.
- printbed
- The printbed is the flat surface where substrates are placed for printing. It may include features such as a vacuum table or registration pins to secure media.
- curing system
- The curing system uses ultraviolet light to trigger photopolymerization of UV-curable inks and coatings. This process allows prints to be handled or finished immediately after printing.
- LED UV module
- An LED UV module emits ultraviolet light using energy-efficient LEDs to cure UV inks during printing. Compared to mercury vapor lamps, it produces lower heat, which may reduce substrate distortion.
- Anti-static module
- An anti-static module neutralizes static electricity on the substrate surface before printing. This can prevent dust attraction and ink misting that may cause print defects.
- Belt-driven system
- A belt-driven system uses a belt to transmit motor movement to a carriage or media transport. Accuracy, acceleration, maintenance, and service life depend on the belt, drive, tensioning, control, and operating load.
- Direct-drive system
- A direct-drive system couples the motor to the moving mechanism without an intermediate belt or gearbox. Its motion performance depends on the motor, encoder, control system, load, and mechanical installation.
- E-chain cable carrier
- A flexible, articulated track that guides and protects cables and hoses as the print carriage moves. E-chain systems prevent cable tangling, abrasion, or electrical interference during operation.
- Honeycomb vacuum table
- A lightweight, rigid structure with a grid of hexagonal cells and integrated suction zones. This design holds rigid substrates flat during printing, supporting precise ink placement and minimizing warping.
- Industrial-grade chassis
- An industrial-grade chassis is the structural printer frame that supports the carriage, printbed or media path, and related systems. Frame stiffness, mass, assembly, and leveling influence vibration and mechanical alignment during operation.
- Linear encoder
- A sensor system that provides positional feedback along a straight axis to synchronize carriage or media movement with image data. Registration and sharpness depend on the validated encoder, drive, and control combination.
- Printhead alignment
- The process of positioning and calibrating each printhead to correct for head placement, angle, and nozzle offsets. Alignment routines adjust ink deposition across the print width.
- RLS encoder
- A linear or rotary position sensor manufactured by Renishaw, used for motion control. Resolution and repeatability depend on the validated encoder, drive, and control combination.
- Vacuum Zones
- Vacuum zones are independently controlled sections of a vacuum table or conveyor that hold media during printing. Operators select the zones needed for the material size and position to maintain stable media support.
- Vibration Reduction
- Mechanical and electronic measures that minimize unwanted movement during printing. Vibration reduction supports consistent droplet placement at high carriage speeds.
- Carriage Speed
- The rate at which the printhead carriage moves across the substrate, typically measured in meters per second. Speed is adjustable to balance productivity and print quality.
- Encoder Resolution
- Encoder resolution is the smallest position increment represented by the encoder output. It is one input to motion control and should not be treated as the same value as print resolution or guaranteed placement accuracy.
- Ricoh Printheads
- Ricoh printheads are industrial piezoelectric inkjet components used in supported SIGNRACER printer configurations. The relevant generation, nozzle count, drop range, ink compatibility, and operating settings are defined by the model configuration.
- Gen.5s Printhead
- Ricoh Gen.5s is an industrial piezoelectric inkjet printhead family used in supported SIGNRACER configurations. Nozzle count, drop range, firing settings, ink compatibility, and achievable output depend on the exact head, waveform, ink, and printer configuration.
- Gen.6 Printhead
- Ricoh Gen.6 is an industrial piezoelectric inkjet printhead family used in supported SIGNRACER configurations. Nozzle count, drop range, firing settings, ink compatibility, and achievable output depend on the exact head, waveform, ink, and printer configuration.
- Waveform
- A waveform is the electronic signal pattern that controls ink droplet ejection from the printhead. Waveforms are optimized for each ink and printhead combination.
- Air-Cooled Curing System
- An air-cooled curing system uses airflow and heat sinks to remove heat from UV LED modules without a water-cooling loop. Thermal performance depends on the module, airflow, ambient conditions, maintenance, and operating power.
- UV ink
- UV ink is a liquid colorant formulated to cure through UV-triggered photopolymerization. It is jetted onto substrates and solidifies on exposure to UV light.
- ink configuration
- Ink configuration refers to the arrangement of ink channels and types loaded into a UV printer, such as CMYK, white, varnish, and spot colors. This setup determines available inks and how they are combined during printing.
- varnish
- Varnish is a clear, UV-curable coating applied over printed graphics to enhance surface protection and create gloss or matte effects. It can be applied selectively or over the full area as a finishing layer.
- primer
- Primer is a preparatory coating applied to substrates before UV printing to promote ink adhesion and surface uniformity. It may be needed for materials such as glass, metals, or plastics where direct ink application may not bond reliably.
- white ink
- White ink is an opaque UV-curable ink used as an underbase, overprint, or standalone layer on transparent, colored, or dark substrates. Required opacity, color appearance, adhesion, and curing depend on layer construction and the validated material process.
- spot color
- Spot color is a pre-mixed ink formulated to match a specific color standard, such as a brand or Pantone color, in UV printing. It is applied through dedicated ink channels for precise, repeatable results in corporate branding and applications requiring color accuracy.
- extended gamut
- Extended gamut printing uses additional ink colors beyond CMYK, such as orange, green, and violet, to expand the range of reproducible colors. This technique can achieve more vibrant and accurate color results for challenging hues and may reduce reliance on spot colors.
- CMYK
- CMYK stands for Cyan, Magenta, Yellow, and Key (black), the four primary ink colors used in UV printing for subtractive color mixing. This model is the standard for full-color printing, enabling reproduction of photographic images, graphics, and text on various substrates.
- color gamut
- Color gamut is the range of colors a UV printer can reproduce with its specific ink set and technology. A wider gamut can support more vibrant and precise color output for premium graphics and branding. Factors such as ink chemistry and substrate affect the achievable gamut.
- color management
- Color management is the process of maintaining consistent color reproduction across the UV printing workflow, from file preparation to final output. It involves calibration, profiling, and software to control color interpretation and minimize color shifts between proofs and printed results.
- ICC profile
- An ICC profile is a standardized file that describes the colour characteristics of a device, such as a UV printer or monitor, within a colour-management system. When paired with calibrated devices, controlled media, and suitable measurement, it supports more predictable colour translation and repeatability.
- RIP software
- RIP (Raster Image Processor) software converts digital design files into rasterized data for UV printers. It manages color separation, resolution, ink limits, and print layout, and may support color management, variable data, and special effects such as white ink and varnish.
- Chemical Resistance
- Chemical resistance describes how a cured ink layer responds to specified solvents, cleaners, oils, or other chemicals under defined exposure conditions. Results depend on the ink, substrate, preparation, curing, chemical, concentration, contact time, and test method.
- Digital Primer
- Digital primer is a preparatory fluid jetted selectively before the image layer to improve adhesion on a particular substrate. The primer, surface preparation, ink, curing settings, and end-use requirements must be validated together.
- Flexible Ink
- Flexible ink is a UV-curable formulation designed to tolerate bending or stretching after curing. The acceptable movement and resistance to cracking or delamination must be validated on the actual substrate and against the intended handling test.
- Ink Adhesion
- Ink adhesion describes how well the cured ink layer remains attached to a substrate. It depends on the material, surface condition, preparation or primer, ink, curing settings, and exposure conditions, so it must be tested for the intended application.
- Glass Adhesion
- Glass adhesion describes how well a cured ink layer remains attached to glass. Results depend on the glass, cleaning, surface treatment, primer, ink, curing settings, and end-use conditions, so the complete process must be tested on the production material.
- Non-Allergenic Ink
- “Non-allergenic ink” is a broad marketing claim that should be used only when supported by formulation data and evidence relevant to the intended exposure. Low chemical emissions or the absence of one substance, such as nickel, does not by itself prove that an ink cannot cause an allergic response.
- nickel-free yellow
- Nickel-free yellow is a yellow ink formulation specified without nickel in the relevant pigment or formulation. This removes one potential source of nickel exposure, but it does not by itself establish hypoallergenic status, skin-contact approval, or blanket regulatory compliance.
- OEM ink
- OEM ink is supplied or approved by the equipment manufacturer for specified printer and printhead configurations. Compatibility does not by itself establish adhesion, durability, or suitability for every substrate or end use.
- SR-100 T
- SR-100 T is a SIGNRACER UV ink series intended for roll-to-roll production. Media compatibility, adhesion, curing settings, and durability must be qualified on the actual flexible material and for the intended use.
- substrate
- A substrate is the base material onto which UV ink is printed, such as acrylic, glass, metal, wood, PVC, or vinyl. Each substrate has unique surface properties that affect UV curing and ink adhesion.
- rigid substrate
- A rigid substrate is a solid, non-flexible material such as wood, glass, metal, acrylic, or composite panels. These materials maintain their shape during printing and are used with flatbed UV LED printers for applications requiring structural integrity.
- flexible media
- Flexible media includes roll-fed or sheet materials that can bend or roll, such as vinyl, fabric, mesh, and films. These materials are used in roll-to-roll or hybrid UV printers for banners, wraps, and textiles.
- roll media
- Roll media refers to flexible printing materials supplied in rolls, such as vinyl, banner fabric, mesh, or adhesive films. This format supports continuous production in roll-to-roll or hybrid UV printers and requires specialized handling and feeding equipment.
- composite panel
- A composite panel is a rigid substrate made by bonding layers of different materials, typically featuring aluminum surfaces with a plastic core. These panels offer strength and a flat surface for UV printing in signage and displays.
- acrylic
- Acrylic is a transparent thermoplastic used as a rigid substrate for UV printing, valued for its optical clarity and smooth surface. It is commonly used for signage and displays where a glass-like appearance is desired.
- MDF
- MDF is an engineered wood product made by compressing wood fibers with resin into dense, smooth panels. It is a rigid substrate for UV printing used for interior signage and displays, and may require priming due to its porous nature.
- PVC
- PVC is a synthetic plastic polymer used as a substrate in UV printing, available in rigid and flexible forms. Its durability and smooth surface make it suitable for indoor and outdoor signage and displays.
- Aludibond
- Aludibond is a composite material of two thin aluminum sheets bonded to a solid polyethylene core, used as a rigid substrate for UV LED flatbed printing. It provides a smooth, stable surface for high-resolution prints in signage and displays.
- non-porous substrate
- A non-porous substrate has a surface that absorbs little or none of the deposited ink, such as glass, metal, acrylic, or some plastics. Adhesion depends on the exact surface, cleaning, pretreatment or primer, ink, curing, and end-use conditions.
- genuine leather
- Genuine leather is a natural, animal-derived material used in premium goods and upholstery. Printing on genuine leather with UV LED printers may require specialized inks to support adhesion and flexibility.
- adhesion
- Adhesion is the ability of a cured ink or coating layer to remain attached to a substrate. It must be evaluated with a defined method after the complete surface preparation, printing, curing, conditioning, and exposure process.
- scratch resistance
- Scratch resistance measures a printed surface's ability to withstand abrasion without damaging the ink layer. This property is relevant for products that may be handled or exposed to wear.
- registration
- Registration is the precise alignment of multiple ink layers or colors on the substrate. Proper registration is critical for sharp, accurate images in multi-pass or multi-color jobs.
- dot placement
- Dot placement is the accuracy with which a UV printer positions individual ink droplets on the substrate. Inaccurate placement can cause blurring, banding, or color shifts.
- drop size
- Drop size is the volume of each ink droplet ejected from a printhead, measured in picoliters (pL). Smaller drop sizes can enable finer details; larger drop sizes may increase coverage.
- picoliters
- Picoliters (pL) are a unit of volume equal to one trillionth of a liter, used to measure ink droplet size in UV inkjet printing. Controlling droplet volume at this scale supports precision in image reproduction.
- print resolution
- Print resolution is the number of ink dots placed per inch (DPI) on the substrate. Higher resolutions can produce finer detail but may reduce print speed and increase ink usage.
- UV-cured
- UV-cured describes an ink or coating whose reactive layer has been polymerized by ultraviolet light. The resulting layer can normally be handled immediately, but adhesion, hardness, flexibility, and resistance depend on the formulation, substrate, curing dose, and process settings.
- GREENGUARD Gold
- GREENGUARD Gold is a third-party certification for chemical emissions from the product named on a certificate under defined test and exposure conditions. Certification applies only to the identified product, scope, restrictions, and validity period; it does not automatically certify every printed item, substrate, printer setup, or end use.
- VOC emissions
- VOC emissions are volatile organic compounds released from a material into air under defined conditions. Emissions claims should be tied to a named product, test method, exposure scenario, result, and valid certificate or report where applicable.
- Bally Test
- The Bally flexometer test repeatedly flexes leather or similar coated material to evaluate resistance to cracking or other visible change. The reported method, specimen, conditioning, cycle count, and pass criteria are needed before results from different tests or products can be compared.
- CE marking
- CE marking is the manufacturer’s declaration that a product meets the EU legal requirements applicable to that product when it is placed on the European Economic Area market. It is not a general quality award, and third-party certification is required only where the applicable legislation calls for a notified body.
- durability
- Durability refers to a print’s ability to withstand physical, chemical, and environmental stress without significant degradation. Adhesion and resistance depend on the validated ink, substrate, preparation, and curing combination.
- EAA (European Accessibility Act)
- The European Accessibility Act (Directive (EU) 2019/882) sets accessibility requirements for specified products and services. A UV printer can support production of tactile or braille elements, but that capability alone does not establish that a sign, product, or service complies with the Act or other accessibility rules.
- REACH compliance
- REACH is the European Union regulation governing the registration, evaluation, authorisation, and restriction of chemicals. Any REACH statement should identify the product, substance scope, evidence, and date being relied on; it is not a general claim that an ink is safe for every use.
- wear resistance
- Wear resistance describes a print’s ability to maintain its appearance and function despite repeated friction, abrasion, or handling. Performance depends on the validated ink, substrate, and curing combination.
- throughput
- Throughput in UV LED flatbed printing measures the printable area covered per unit time, typically in square meters per hour (m²/h). This metric is key for estimating job completion times and planning production schedules.
- draft mode
- Draft mode is a UV printer setting that maximizes print speed by lowering resolution and reducing ink coverage. It is suitable for prototypes or test prints where high visual quality is not required.
- production mode
- Production mode balances print speed and image quality for standard commercial printing tasks. This setting is typically used for routine jobs where both turnaround time and visual standards matter.
- quality mode
- A print setting that prioritizes highest resolution, color fidelity, and fine detail, typically at slower speeds. Used for applications where image quality is the primary requirement.
- print speed
- The rate at which a UV printer applies ink to a substrate, usually measured in square meters per hour (m²/h). Higher speeds increase output but may affect image quality depending on the selected print mode.
- print width
- The maximum horizontal span a UV printer can cover in a single pass, defining the largest material width printable without repositioning. Differs from print length, which refers to the other media dimension.
- print area
- The total maximum surface a UV printer can cover in a single job, determined by both print width and print length. A larger print area reduces the need for manual repositioning or panel assembly.
- media thickness
- The maximum substrate thickness a UV printer can accommodate, measured in millimeters or inches. Affects printer setup, including printhead height and vacuum table adjustments.
- curing width
- Curing width is the width of the active UV exposure zone provided by a curing configuration. SIGNRACER model specifications identify supported single, double, or triple settings where available; it is not the printer’s overall print width.
- curing power
- Curing power describes the UV output setting or power density used to polymerize a compatible ink layer. The appropriate exposure depends on the ink, layer thickness, substrate, print speed, lamp geometry, and required final properties.
- uptime
- The percentage of time a UV printer is operational and ready for production, excluding maintenance or downtime. High uptime supports productivity.
- workflow
- The complete sequence of steps in producing a printed product, from design file preparation and color management through printing, UV curing, finishing, and quality control. A streamlined workflow supports efficient, repeatable output with minimal errors or downtime.
- rollout
- The structured process of introducing new printing equipment, workflows, or products into a production environment. It includes phases such as operator training, system testing, and gradual scaling to full production capacity.
- onboarding
- The process of integrating new operators, users, or clients into the production environment through training on equipment, software, and workflows. This helps personnel become competent before live production begins.
- go-live
- The point when UV printers and related systems begin full-scale production after setup, testing, and training are complete. This transition signals the start of customer jobs rather than internal tests or pilot runs.
- fit check
- A quality control step where printed samples are physically tested on the actual substrate or product to confirm correct dimensions, alignment, and adhesion. This verifies the print fits and functions as intended in its final application.
- sample validation
- The review and approval of printed samples to ensure they meet technical, aesthetic, and functional requirements before full production. This includes evaluating color accuracy, adhesion, curing quality, and substrate compatibility.
- pilot production
- A limited, controlled manufacturing run designed to test and optimize printing parameters, workflows, and materials before scaling up to full production. This phase helps identify potential issues and validate processes.
- approval-ready samples
- Finished print outputs that have passed internal quality checks and are prepared for client or stakeholder review before mass production. These samples represent final product quality and serve as the benchmark for the production run.
- SOP
- A documented set of step-by-step instructions for operating printers, handling materials, and performing quality checks. SOPs help ensure all team members follow consistent, approved methods, resulting in repeatable results.
- quality checkpoints
- Quality checkpoints are planned stages in a UV printing process where criteria such as print consistency, adhesion, curing, and color accuracy are systematically evaluated. These checkpoints enable early detection of defects and are documented as part of a quality assurance system.
- mock-up
- A mock-up is a prototype or sample print created to evaluate the final product before full-scale production. Mock-ups are printed on actual substrates to assess color, texture, and design accuracy.
- Prototype Printing
- Prototype printing is the rapid production of sample prints or mock-ups before full-scale manufacturing. It allows users to test colors, textures, and design accuracy on final materials without lengthy setup.
- signage
- Signage includes informational, directional, identification, safety, and promotional graphics produced on rigid or flexible media. Material, ink, finishing, mounting, and durability requirements vary by location and intended service conditions.
- tactile signage
- Tactile signage communicates through raised characters, braille, symbols, or textured elements that can be read by touch. Geometry, contrast, language, material, mounting, and durability requirements depend on the applicable standard and project approval criteria.
- braille printing
- Braille printing builds raised dot patterns that can be read by touch. Dot geometry, spacing, language, durability, substrate, and installation must be checked against the project’s applicable accessibility standard and approval process.
- watch dial printing
- Watch dial printing applies fine graphics, text, color, and optional effects to dial components. Registration, drop placement, layer control, ink compatibility, curing, adhesion, and resistance must be validated on the actual dial material and coating.
- industrial parts decoration
- Industrial parts decoration applies graphics, identifiers, instructions, or decorative layers directly to manufactured components. The ink, surface preparation, fixture, curing process, and resistance tests must be qualified for the component material and service conditions.
- Automotive Interior Customization
- Automotive interior customization applies graphics, textures, or branding to trim and other interior components. Production approval requires validation of the material, ink system, appearance, adhesion, flexibility where relevant, and the environmental and wear tests specified for the part.
- Braille Dot
- A braille dot is a raised, tactile element used in braille signage to convey information to visually impaired users. UV ink can be layered to build braille dots, with dot height and spacing validated against the relevant project standards.
- Accessibility-Oriented Signage
- Accessibility-oriented signage may combine braille, raised characters, tactile symbols, visual contrast, and other features required by the project. The applicable standard, language, dimensions, installation, and approval criteria must be confirmed for each location; printer capability alone does not establish compliance.
- Water-Based Printer
- A water-based printer uses ink in which water is the primary liquid carrier. Drying commonly relies on absorption, evaporation, air movement, or heat, and media compatibility depends on the ink technology, coating, and printer design.