Digital Printing
How digital inkjet and electrophotographic printing work, the main print systems (water-based, Eco-solvent, UV, Latex, Indigo, toner) and why the print medium must match the print engine.
What is digital printing?
Digital printing reproduces an image directly from a digital file onto a substrate, without plates or screens. Unlike offset printing, every copy can be different — which makes it the standard for personalised, short-run and on-demand jobs such as window advertising, event graphics and retail promotions. The ink or toner is applied in tiny dots by the print head, and the substrate (the 'media') must be coated or structured to accept and fix those dots.
- Plate-less: digital file goes straight to print
- Ideal for short runs, personalisation and on-demand jobs
- Media must be coated/structured to accept ink or toner
Print systems at a glance
Each print technology lays ink down differently and needs a matching medium. Water-based dye and pigment inks are economical desktop solutions. Eco-solvent (弱溶) inks are the workhorse of sign shops — durable, low-odour and compatible with most self-adhesive films. UV-curable inks dry instantly under UV lamps and print on the widest range of surfaces. Latex inks are water-based with heat-cured polymer resin, odour-free and indoor-safe. HP Indigo uses liquid electro-ink, and toner-based machines use electrophotography; both are common for premium short-run print.
- Water-based: economical desktop printing
- Eco-solvent: durable, low-odour, sign-shop standard
- UV: instant cure, widest surface compatibility
- Latex: odour-free, heat-cured, indoor-safe
- Indigo / toner: premium short-run electrophotographic print
Why the medium must match the print engine
The coating on a print medium is formulated for a specific ink chemistry. Eco-solvent ink swells the coating so pigment can anchor; UV ink sits on the coating and cures; water-based ink needs an absorbent coating layer. Printing solvent ink on a water-only medium can cause bleeding, mottling or slow drying; printing water ink on a solvent medium can cause pooling. That is why every ZST model lists its exact print compatibility — always check the model datasheet before printing.
- Coating chemistry is matched to ink chemistry
- Wrong match causes bleeding, mottling, pooling or slow drying
- Always check the model datasheet's print compatibility
Indoor vs outdoor durability: ink + media together
Outdoor life is a property of the printed result, not the film alone. UV-stable inks combined with a UV-resistant coating and a stable film substrate decide how long a graphic survives sun, rain and abrasion. ZST's WALLIZARD® PET models are rated indoor and outdoor, while the removable film technology itself stays residue-free — a long-term removable graphic needs both an outdoor-rated medium and outdoor-rated inks.
- Outdoor life = ink + coating + substrate
- PET WALLIZARD® models are rated indoor & outdoor
- Removable + outdoor both required for long-term exterior graphics