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Solid ink

Solid ink, also known as phase-change ink, is a printing technology that employs solid sticks of pigmented wax, which are melted into a liquid state and precisely jetted onto paper or other media, where they rapidly solidify to form vibrant, durable images without requiring drying time.^[1] Unlike traditional liquid inkjet or toner-based systems, solid ink eliminates the need for cartridges, reducing waste and enabling compatibility with a wide range of media, including plain, recycled, and specialty papers up to 220 gsm.^[1]^[2] Developed initially by Tektronix in the mid-1980s, solid ink technology marked a significant innovation in color printing by addressing limitations of liquid inks, such as spreading and media restrictions.^[3] The first commercial solid ink printer was introduced in 1991, utilizing a process where ink sticks are loaded into the printer, melted in a printhead reservoir, dropped as droplets onto a rotating drum, and then transferred to the medium under pressure from a pressure roller.^[1] In 2000, Xerox acquired Tektronix's color printing and imaging division, which accelerated the integration of solid ink into multifunction printers (MFPs) and expanded its application for high-volume office environments.^[3] Key advantages of solid ink include exceptional color vibrancy and uniformity, achieved through polymer-based inks that produce saturated hues comparable to offset printing, along with PANTONE-approved simulations for consistent branding.^[4] It offers lower operational costs due to minimal consumables—ink sticks yield up to 4,500 pages per color—and demonstrates superior environmental performance, with life-cycle assessments showing approximately 30% less cumulative energy demand and 90% reduced post-consumer waste compared to color laser printers.^[1]^[5] Additionally, the technology supports high-speed output, up to 55 pages per minute, with fewer moving parts for enhanced reliability and ease of maintenance.^[2] Although Xerox discontinued production of solid ink printers and MFPs around mid-2016, transitioning to VersaLink LED-based systems, the technology remains notable for its contributions to sustainable, high-quality color printing and continues to be supported with ink supplies for existing devices.^[2]

Fundamentals

Definition and Composition

Solid ink, also known as phase-change ink, is a waxy, resin-based polymer that remains solid at room temperature and must be heated to become liquid for application in printing processes.^[6] It is formulated primarily from paraffin wax, which constitutes 50-60% of the composition, providing the solid structure and phase-change properties, along with resins (10-20%) that enhance adhesion and durability.^[7] The key components include colorants such as dyes or pigments for achieving vibrant hues, typically in cyan, magenta, yellow, and black (CMYK) formulations to enable full-color printing; for instance, proprietary blue, red, yellow, and black dyes each make up 0-10% depending on the specific color stick.^[7] Additives, such as stabilizers, are incorporated to maintain thermal stability and prevent degradation during repeated melting and solidification cycles.^[6] These elements ensure the ink's semicrystalline vehicle—composed of waxes and resins—supports precise control over viscosity, which drops to a low level (around 15 cP) when heated.^[6] A defining characteristic of solid ink is its phase-change behavior: it transitions from a solid state to a liquid upon heating to approximately 100°C, allowing for accurate deposition without the evaporation issues common in solvent-based inks.^[7] This melting point ensures the material stays intact under normal handling conditions but liquefies reliably during use. Solid ink is non-toxic and safe for handling, with no expected irritant effects on skin, eyes, or through ingestion under normal conditions, as confirmed by standard toxicity assessments.^[7] Its safety was historically demonstrated in the 1990s when Tektronix executives consumed a portion of the ink to prove its harmless nature.^[8]

Applications in Printing

Solid ink is primarily applied in phase-change inkjet printing systems, where it enables the production of high-volume color documents and graphics in office and workgroup environments. These systems, such as those developed by Xerox, support duty cycles up to 120,000 pages per month, making them suitable for demanding color printing needs like marketing materials and presentations.^[4] The technology demonstrates broad media compatibility, including plain paper, transparencies, envelopes, labels, card stock, and glossy media, without requiring special coatings on the substrate. Upon ejection as molten droplets, the ink solidifies rapidly on contact, forming a raised, glossy surface that delivers vibrant, saturated colors by avoiding absorption or wicking into the paper fibers. This surface-level adhesion enhances output quality across diverse substrates, producing durable prints with minimal drying time.^[9]^[4]^[10] In niche applications, solid ink supports proofing systems and short-run commercial printing, where its color accuracy and consistency are advantageous for simulating final output in graphic arts workflows. The non-wicking behavior ensures precise color reproduction, with vivid hues and high gamut coverage that align closely with offset standards, facilitating quick iterations in small-batch production.^[10]^[11]

Design and Operation

Ink Melting and Application Process

Solid ink sticks are fed into a heated reservoir within the printer, where they are melted into a liquid state to prepare for printing. The melting process occurs in a controlled enclosure, typically heated to temperatures between 100°C and 140°C, allowing the waxy, polymer-based ink to liquefy without reaching its boiling point or degrading.^[7]^[10] This phase change is facilitated by the ink's composition, which includes resins and waxes designed for low viscosity in the molten state.^[6] Once liquefied, the ink is ejected using a drop-on-demand mechanism, primarily employing piezoelectric printheads that generate precise pressure pulses to form and propel droplets. These droplets, typically ranging from 10 to 20 picoliters in volume, are jetted at high temperatures around 140°C toward an intermediate rotating drum.^[12] The ejection process operates at frequencies up to 33 kHz, ensuring rapid deposition while maintaining droplet integrity during flight over short distances of 0.5 to 2 mm.^[12] The liquid ink droplets adhere to the surface of the rotating drum, which is maintained at 60°C to 80°C and coated with a thin layer of silicone release oil to prevent sticking and ensure uniform spreading. From the drum, the ink image is transferred to the printing media under applied pressure from a transfix roller, which fixes the ink in place through mechanical adhesion.^[10] This offset transfer mechanism allows for high-resolution imaging by smoothing the ink layer before final application.^[12] Upon contact with the room-temperature paper, the molten ink cools rapidly and solidifies almost instantly, transitioning from a liquid to a solid state between its liquidus temperature (around 115°C) and solidus temperature (around 60°C). This quick phase change forms a durable, non-penetrating layer on the media surface, with the ink's hemispherical droplets coalescing into a flat, vibrant print.^[6]^[12] The solidification process is influenced by the substrate's thermal properties, resulting in minimal dot gain and enhanced color density.

Printer Components and Mechanism

Solid ink printers employ an ink delivery system that uses solid ink sticks instead of liquid cartridges, which are loaded into color-specific reservoirs. These sticks, typically composed of wax-based polymers, are shape- and color-coded (for cyan, magenta, yellow, and black) to ensure error-free insertion and prevent cross-contamination. A dedicated melting unit within the reservoir heats the sticks to approximately 100–140°C, converting them to a liquid state for ejection, and allows replenishment during operation to minimize downtime.^[13]^[3] The printhead assembly features a fixed, page-width linear array of piezoelectric nozzles, typically numbering around 1,236 per color channel in commercial models, enabling the ejection of over 30 million ink drops per second onto the transfer surface. Fabricated from durable stainless steel in controlled clean-room environments, this stationary design eliminates the moving carriage found in conventional inkjet printheads, reducing mechanical complexity and supporting high-speed, continuous printing up to 50 pages per minute.^[13] Central to the mechanism is the intermediate transfer drum, an aluminum cylinder that rotates to receive liquefied ink from the printhead, forming the image layer. A drum maintenance unit applies a thin silicone oil release agent via a metering roller to the drum's surface, ensuring clean ink transfer and preventing residual buildup or adhesion during high-volume runs. The image is then pressed onto the print media by a compliant pressure roller, which solidifies the ink upon contact with the cooler substrate; a warm-up phase heats the drum to operational temperature to inhibit nozzle clogs. The release agent applicator roller is engineered for longevity, lasting up to 30,000 pages before replacement.^[13]^[14] Power and control systems in these printers accommodate the thermal demands of ink melting and drum operation, with average printing power consumption ranging from 252 W to peaks of 580 W, while sleep mode draws about 45 W to maintain readiness without excessive energy use. Integrated sensors monitor and regulate temperatures across the melting unit, printhead, and drum for consistent performance. A robust controller, often equipped with a 600 MHz processor and 64-bit architecture, orchestrates component synchronization, including predictive warm-up based on usage patterns to balance efficiency and output quality.^[15]^[13]

Advantages

Print Quality and Versatility

Solid ink printing achieves vibrant and precise colors through its wide color gamut, which supports accurate matching across a broad spectrum of hues, including lively tones like oranges and yellows. This is enabled by the stable phase-change ink droplets that solidify rapidly upon contact with the media, preventing feathering and ensuring consistent, glossy output without bleeding.^[16]^[17]^[10] The technology delivers high-resolution prints up to 600 dpi natively, with enhanced modes reaching 1200 dpi, producing sharp edges ideal for graphics, photographs, and detailed images even on uncoated or rough paper. This resolution level maintains clarity and detail, making it suitable for professional visual content.^[18]^[17] Solid ink printers exhibit strong versatility, accommodating a wide range of media sizes from A4 to legal and various types including copier paper, premium stocks, envelopes, labels, and overhead transparencies, without the drying or clogging issues common in liquid ink systems. The ink's quick-solidifying nature allows reliable performance across these substrates, from thin bonds (60 gsm) to heavy covers (216 gsm).^[17]^[4] Prints produced with solid ink demonstrate enhanced durability, with excellent resistance to smudging and abrasion comparable to color laser outputs, as well as complete water-fastness due to the ink fusing directly to the media without absorption. In comparative tests by Buyers Laboratory International, solid ink samples showed no density loss or visible damage after multiple rub cycles, outperforming some liquid ink technologies in smudge resistance while maintaining image integrity.^[10]^[19]

Environmental and Cost Efficiency

Solid ink printing significantly reduces waste compared to traditional toner-based systems by eliminating the need for disposable cartridges and minimizing packaging materials. Unlike laser printers that generate substantial cartridge waste—up to 450 pounds over four years of typical use—a solid ink printer produces only about 23 pounds of waste in the same period, representing a 90% reduction overall.^[20] The compact ink sticks require far less packaging, with some models achieving up to 90% less packaging and plastic than comparable color laser printers, further decreasing landfill contributions and plastic use.^[21] This cartridge-free design not only simplifies disposal but also lowers the environmental footprint associated with manufacturing and shipping consumables. In terms of eco-friendliness, solid ink formulations contribute to lower environmental impact through reduced emissions and recyclable elements. The process emits fewer volatile organic compounds (VOCs) than solvent-based liquid inks, as the wax-like sticks melt without evaporating harmful solvents during operation.^[1] Additionally, the ink sticks and their minimal packaging, often in crushable plastic trays and recycled boxes, are designed for easy recycling, and the non-toxic composition avoids heavy metals or persistent chemicals found in some toners.^[22] Printouts from solid ink can be de-inked using standard recycling processes, supporting sustainable paper reuse.^[23]^[24] Cost efficiency is a key advantage, particularly for ongoing operations, where solid ink achieves low per-page expenses due to high-yield sticks and precise application. Color pages typically cost 1-2 cents, significantly less than the 10-15 cents for many color laser printers, thanks to efficient ink utilization that minimizes overuse.^[25] While initial printer costs may be higher—often $500-1,000 more than entry-level lasers—these are offset by longevity and savings over high-volume use, such as workgroups printing over 2,000 color pages monthly.^[25] Energy efficiency improves in steady-state operation, where solid ink printers consume less power after the initial warm-up phase compared to some color laser models that maintain high-heat fusers continuously. Lifecycle assessments show 30% lower overall energy demand, including manufacturing and use, due to the on-demand melting process and compact ink production requiring 25-35% less energy per pound than toner.^[1] This results in reduced operational electricity costs, especially for frequent printing, while the technology's design supports up to 50% energy savings versus standard lasers in active modes.^[20]

Disadvantages

Performance Limitations

Solid ink printers require a significant warm-up period of 3 to 5 minutes to melt the solid ink sticks into a printable liquid form before any output can begin.^[26] This delay stems from the thermal heating process in the printer's ink loading and melting components, making them unsuitable for immediate printing tasks upon power-on.^[27] Once warmed, the first-page output time is as fast as 5 seconds, typically under 10 seconds for most models.^[9]^[28] Print speeds for solid ink printers generally range from 20 to 55 pages per minute (ppm) in color mode, suitable for moderate to high workloads, though some high-volume laser printers can exceed this in specific configurations.^[26]^[2] This limitation becomes pronounced in demanding environments requiring rapid, large-scale production, where the phase-change ink application process introduces slight pauses for ink redistribution.^[16] After operation, solid ink printers remain hot and necessitate a cooldown period of up to 30 minutes before safe relocation, as residual heat in the printhead and drum can cause internal damage if moved prematurely.^[29] Additionally, these printers exhibit poor performance on glossy photo paper due to uneven ink adhesion on coated surfaces, resulting in suboptimal color vibrancy and durability; they perform best on plain paper stocks.^[16]^[30]

Maintenance and Durability Issues

One major maintenance challenge with solid ink printers is the risk of ink solidification in the nozzles during periods of inactivity. The phase-change nature of the ink means that if the printer is idle for extended periods, the melted ink can cool and harden within the printhead nozzles, leading to print defects such as missing colors or streaks. To address this, printers automatically initiate cleaning or priming cycles upon startup to address potential solidification, which can consume ink and extend warm-up time. In severe cases, persistent clogging may require professional printhead replacement, with costs typically ranging from $200 to $500 depending on the model and service provider.^[31] The printheads in solid ink systems are fixed and non-user-replaceable, contributing to higher long-term maintenance burdens. These components are engineered to endure the printer's expected operational life, generally rated for 100,000 to 300,000 pages based on typical office usage and maximum duty cycles of up to 85,000 pages per month. However, once the warranty expires, any printhead failure necessitates costly service interventions by authorized technicians, often exceeding $500 including labor, which can render repairs uneconomical compared to replacing the entire unit. Following discontinuation in 2020, obtaining replacement parts like printheads has become more challenging as of 2025, potentially increasing maintenance costs for legacy devices.^[1]^[32]^[2] Solid ink printers also present durability issues related to their physical design, including a bulkier footprint necessitated by large ink reservoirs and the rotating transfer drum used in the printing process. This results in dimensions often exceeding 20 inches in depth but around 15 inches in height for mid-range models, making them less suitable for compact office spaces compared to slimmer laser alternatives. Historically, these design factors contributed to higher initial acquisition costs, with base models priced around $900 and fully configured units reaching $10,000 or more upon release in the mid-2000s.^[33]^[34]^[35] Additionally, the repeated thermal cycling required to melt solid ink sticks at temperatures around 100-140°C and then cool the jetted droplets accelerates wear on key components over time. This process degrades heating elements, seals, and the printhead assembly through thermal fatigue and material expansion/contraction, potentially shortening overall system longevity in high-volume environments despite the technology's robust design intent. The warm-up phase, which can take several minutes to stabilize temperatures, further exacerbates these maintenance needs by increasing operational cycles.^[1]

History and Development

Early Innovations

The early development of solid ink technology emerged in the context of advancing inkjet printing to address limitations of traditional liquid inks, such as evaporation and clogging. In 1962, Teletype Corporation introduced foundational work through Project 176, pioneering solid ink systems for telegraphy and basic character printing using electrostatic ink-jet devices. This innovation, patented by C. R. Winston as a method for transferring ink via continuous inkjet streams, marked the initial shift toward more stable ink formulations that remained solid at room temperature to prevent drying issues in non-printing nozzles.^[36] During the 1960s and 1970s, research intensified on continuous inkjet (CIJ) systems, with companies like IBM conducting extensive experiments to adapt the technology for computer printers. IBM licensed early CIJ methods in the 1970s and developed the IBM 6640, one of the first letter-quality inkjet printers, emphasizing raster-scan techniques for precise droplet control. Concurrently, Exxon pioneered phase-change inks—also known as hot-melt or solid inks—that were heated to liquid form for ejection and solidified upon cooling on the substrate, effectively eliminating drying and solvent evaporation problems inherent in aqueous liquid inks. These efforts focused on wax-based compositions for enhanced stability and reliability in CIJ applications.^[36]^[37] Advancements accelerated in the early 1980s with the transition to drop-on-demand (DOD) mechanisms, exemplified by Howtek Inc.'s work starting in 1982 under R.H. Research. Howtek developed the Pixelmaster printer, an early color DOD system using solid ink pellets that were melted and ejected as needed, overcoming the continuous stream inefficiencies of prior CIJ designs. This culminated in a key 1985 patent for ink-jet color printing methods, enabling higher precision and versatility in solid ink application for graphic arts. The core innovation lay in leveraging solid inks' phase-change properties for improved nozzle stability and reduced waste, setting the foundation for subsequent commercial prototypes achieving resolutions around 300 dpi.

Commercialization and Decline

The commercialization of solid ink printing began with Tektronix's introduction of the PhaserJet PXi in June 1991, marking the first commercial color solid ink printer priced at approximately $10,000 and targeted at office environments for its ability to produce high-quality color output on plain paper.^[38] This model leveraged phase-change ink technology to address limitations in traditional inkjet and thermal wax printers, enabling multitasking and 300 DPI resolution for professional applications.^[39] Building on early innovations in ink formulation and jetting mechanisms from the 1980s, the PhaserJet PXi represented a shift toward accessible color printing for businesses, though its high cost initially limited it to specialized office use. In 2000, Xerox acquired Tektronix's Color Printing and Imaging Division for $950 million, integrating solid ink technology into its portfolio.^[40] This acquisition expanded Xerox's color printing capabilities, leading to further development of the technology, including the Phaser 8400 series introduced in 2004 for graphic arts and office use, and rebranding the line under the ColorQube series to emphasize cartridge-free solid ink sticks. Models like the ColorQube 8570 launched in 2010 offered 40 ppm speeds and targeted small to medium-sized businesses (SMBs) with lower operating costs compared to traditional laser printers.^[41] During the 2010s, solid ink printers saw peak adoption among SMBs for their cost savings on color printing, contributing to a 27% growth in mid-range color device installations in 2010 alone, as businesses sought efficient alternatives to inkjet and toner-based systems.^[42] The decline of solid ink technology accelerated after the mid-2010s, with Xerox announcing the phase-out of A3 models in 2015 for implementation in 2016 amid intense competition from advanced inkjet and laser printers that offered improved speed, reliability, and lower upfront costs.^[43] Although A4 models continued initially, high development and maintenance expenses, coupled with a market shift toward cloud-based and digital printing solutions that reduced demand for physical hardware, led to the full discontinuation of production and sales around 2020, ending its commercial prominence despite earlier gains in office efficiency.

Current Status

Discontinuation and Market Impact

In 2016, Xerox discontinued the production and sale of new solid ink printer models, marking the end of active development in this technology for mainstream office and production printing.^[43] This decision followed years of competition from more cost-effective inkjet and laser alternatives, which offered improved margins and broader adoption in the evolving printing market. Support for existing solid ink devices, such as the ColorQube 9200 series, officially ended around December 2021, leaving owners without manufacturer-backed repairs or parts.^[44] The discontinuation significantly impacted the market, forcing users—primarily in small to medium businesses—to transition to inkjet or toner-based systems, accelerating the shift away from phase-change ink technologies in two-dimensional printing applications. This move reduced overall innovation in solid ink for consumer and office segments, as resources pivoted to higher-volume inkjet platforms. Legacy effects included inspiring competitors to prioritize eco-friendly ink formulations, with solid ink's low-waste model influencing designs that emphasize reduced packaging and energy use in modern printers. Niche service markets for repairs and third-party ink supplies have persisted, sustaining a small ecosystem for maintaining older units. As of 2025, no major manufacturers produce new solid ink printers, with Xerox focusing instead on inkjet and laser lines. The resale market for used models, such as the Phaser 8500/8550 or ColorQube 8700 series, remains active on platforms like eBay, where functional units typically sell for 10-20% of their original retail prices, depending on condition and model.^[45]^[46]

Alternatives and Legacy Applications

Following the discontinuation of solid ink printers in 2016, color laser printers have emerged as a primary alternative, offering superior print speeds for office and professional environments. For instance, the Xerox VersaLink series provides robust color output at rates up to 35 pages per minute, making it suitable for high-volume tasks previously handled by solid ink models.^[46] These devices utilize toner powder, which is fused via heat, delivering consistent results on various media without the phase-change process of solid ink.^[25] Ink tank inkjet systems, such as the Epson EcoTank lineup, represent another key substitute, emphasizing low-waste operation akin to solid ink's cartridge-free design. Models like the EcoTank ET-8550 use refillable ink reservoirs that yield thousands of pages per bottle set, reducing plastic waste and long-term costs for users focused on sustainability.^[47] In comparison, color laser printers like the VersaLink achieve faster throughput—often doubling inkjet speeds—but consume more energy during fusing, with typical models drawing 600-800 watts versus 20-50 watts for ink tanks.^[48] Conversely, ink tank inkjets offer lower initial purchase prices, starting around $300, though traditional cartridge-based variants generate more packaging waste than solid ink or tank systems.^[49] Legacy applications of solid ink technology persist in niche areas, particularly where phase-change wax properties enhance precision and durability. In 3D printing, wax-based systems derived from solid ink principles, such as those in Stratasys' Solidscape printers, produce prototypes for investment casting in jewelry and aerospace, enabling high-resolution models with smooth surfaces up to 25-micron layer thickness.^[50] These utilize inkjet deposition of molten wax that solidifies layer by layer, mirroring solid ink's thermal transfer for creating detailed, burn-out patterns without supports.^[51] Additionally, solid ink's vibrant color reproduction and fade-resistant output have found continued use in archival proofing within graphics arts, where it supports contract proofing for offset printing with accurate Pantone matching.^[52] This application leverages the technology's wax encapsulation, which protects pigments from environmental degradation, ideal for pre-press validation in design studios.^[52] Looking ahead, the expiration of key solid ink-related patents, including derivatives from Xerox's early formulations filed in the 1990s, could spur revival through sustainable printing research and open-source adaptations.^[53] With core phase-change patents like US5123961A in the public domain since 2009, innovators may repurpose the technology for eco-friendly inks in additive manufacturing. This forward momentum aligns with R&D in low-emission printing, fostering hybrid systems for green prototyping.^[54]

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https://www.printerbase.co.uk/news/solid-ink-printer/
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The 6 Best Printers For Small Business of 2025 - RTINGS.com
Mar 13, 2025 · HP OfficeJet Pro 9135e: The HP OfficeJet Pro 9135e is a great inkjet alternative to the Canon Color imageCLASS MF656Cdw.
[48]
Epson EcoTank vs. Laser Printers: Which One Should You Choose?
Rating 4.9 (16) Aug 22, 2025 · Color laser printers are solid for charts and visuals, but not quite as vibrant or detailed as ink-based systems. On the flip side, EcoTank ...
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Solidscape – Wax 3D printers for jewelry
100% Wax 3D printing. 3D print true wax masters for exceptional investment casting results. Serving the jewelry industry since 1994.3D Printers · Contact Us · About · NewsMissing: ink | Show results with:ink
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Solidscape Announces the S500 High Precision Wax 3D Printer
Jul 31, 2017 · The S500's 3D printing process is unique – and proprietary. Two stages take place in the printing process. The first stage is to deposit drops of liquid wax in ...Missing: solid ink
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Solid Ink Printing Laser Printers, Color Printers and Supplies at ...
The solid ink printing process: The printer has a warm-up procedure. At this time the ink-melter and printhead are heated so the solid ink melts to a liquid ...Missing: ejection solidification<|control11|><|separator|>
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Solid ink - US5123961A - Google Patents
For the hot-melt ink jet printing performance, the melted fluid ink preferably has the pigment or dye with its density being in a range of 5 to 40 [weight%] and ...
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Solid ink stick for a color printer - USD440248S1 - Google Patents
Anticipated expiration. Status. Expired - Lifetime. Show all events. Info: Patent citations (40) ... Xerox Corporation Solid ink stick for solid ink printers.
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Advanced 3D-printed phase change materials - ScienceDirect.com
Nov 3, 2021 · 3D-printed composite phase change materials (PCMs) can overcome shape limitations and optimize structures to construct complex object designs ...