Future Printing Materials Might Be Tested on Food First

A client brings in a pitch for an edible tray liner. Once the package is opened, the divider itself serves as a snack, and they want a brand logo printed right on it. The first question running through your mind probably is not how to lay out the artwork. It is: can we actually print on this thing? Will the ink blur, or will the substrate collapse after sitting for three days?

Questions like this have become far more common in recent years, and not just in the food sector. Compostable substrates, bio-based barrier coatings, and thick functional inks all pose the same core question: when materials are no longer standard paper, plastic film, or familiar four-color process inks, how do we define printability?

Right now, the research best equipped to answer this appears in food engineering journals rather than graphic arts publications. If you want to understand how to evaluate printability on emerging specialty substrates, look at how researchers in 3D food printing dial in their formulations

Because 3D food printing pushes the concept of printability down to raw physics

A study published in the Journal of Food Engineering used Tremella fuciformis polysaccharide to adjust the rheology, structural stability, and printability of pea protein and κ-carrageenan composite hydrogels [1]. The challenge in that study was finding the balance where the material is soft enough to extrude, yet firm enough to prevent structural collapse when stacked

Printers deal with this exact balance every single day. Screen printing ink that is too thick will not clear the mesh, but if it is too thin, it bleeds. High-build spot coatings need substantial thickness, but poor leveling results in an orange peel texture. Textured UV printing aims for a distinct tactile finish in one pass, but printing too thick leads to under-curing, while printing too thin leaves the customer unimpressed

The fundamental difference with 3D food printing is the complete absence of a supportive substrate. Paper absorbs ink and provides capillary action, allowing an imperfect formulation to produce acceptable output. In food printing, the material must support itself entirely. If the formulation is off by a fraction, the whole structure turns into a puddle. This extreme condition strips away the substrate safety net, fully exposing the material's intrinsic rheological window. For anyone working with novel materials, it serves as a remarkably clean reference model

3D food printing acts as an extreme stress test for material printability. Any formulation logic that proves successful there will only find production conditions on a commercial printing line more forgiving, never harsher

Printability is never a single metric. It is the intersection where three competing conditions meet

Looking at the logic from the study, printability breaks down into three distinct hurdles [1]:

・Flow under shear: The material must flow when subjected to shear. In printing, this maps directly to viscosity and shear-thinning behavior, describing how ink performs under a squeegee, through mesh openings, or across an inkjet nozzle

・Stop on demand: Once past the nozzle, the material must recover structure rapidly without spreading flat. In printing, this maps to leveling and structural recovery, determining how far a printed dot expands after transfer

・Hold its shape: After stacking or resting over time, the shape must hold. This matches build stability in thick-film printing, and dictates whether an edible or biodegradable substrate survives three months in a warehouse

The third hurdle is where things get interesting. Traditional printing relies heavily on curing to hold shape, using UV radiation, heat, or oxidative polymerization to lock materials in place with external energy. 3D food printing rarely has that option, because high heat or photoinitiators destroy edibility. Researchers must solve stability through the formulation itself, relying on self-supporting networks of polysaccharides, proteins, and hydrocolloids [1]

That constraint offers a valuable lesson. As sustainability standards tighten and traditional curing methods face stricter limits (low migration, photoinitiator-free systems, compostability), the print industry will eventually need to master shape retention through formulation rather than forced curing. The food sector was simply forced to walk that path first

They matter immensely. In fact, they provide the one thing novel materials lack most: a quantitative quality vocabulary

Food 3D printing research often stops at relative descriptions like shape fidelity or extrusion continuity. The commercial printing industry is far ahead on this front. Flexographic print research has long established clear relationships between press parameters and measurable metrics, including dot gain, impression pressure, and ink transfer [4]. Standardized evaluation methods continue to build up across publications like the Journal of Graphic Engineering and Design [3]

On the material side, established packaging and paper standards (such as ASTM paper and packaging standards) provide a shared framework to determine whether a batch passes inspection, replacing guesswork with hard metrics [2]

The two fields complement each other directly:

・Food science brings formulation methodology, showing how a single additive can systematically adjust the rheological window

・The print industry brings quality measurement and standardization, turning subjective quality into repeatable, verifiable numbers

Evaluating the printability of next-generation materials will mean merging these two worlds: pairing food science material design with commercial print inspection standards. The real bottleneck today is the lack of dedicated testing standards for non-traditional substrates. Existing paper and film tests simply cannot capture how edible films or bio-based coatings behave under real-world distribution conditions

Start with the questions you ask your suppliers, not with your machines

When assessing an unfamiliar specialty substrate, lay out the risks using three questions in strict order:

First, what is the material's rheological window? You must determine the shear rate and temperature ranges where behavior stays stable. The food study systematically tuned polysaccharide content for this exact reason: to widen and stabilize that operating window [1]. Materials with narrow windows are not unusable, but you have to accept lower yields and tighter environmental controls

Second, what mechanism holds its shape? Does it rely on curing, solvent evaporation, or an internal structural network? The mechanism dictates the process variables you need to control. Materials relying on internal networks are sensitive to time and temperature. A proof that looks flawless right off the press might sag two weeks later

Third, what are the measurement and acceptance standards? This is where projects most often fall apart. If you quote a job without agreed metrics and tolerances, disputes are guaranteed when the client claims a batch collapsed and you insist it held. The print industry's established quantitative methods are invaluable assets here [3][4]

In practice, split sampling for non-traditional materials into two separate sign-offs: printability and shelf stability, separated by two to four weeks of real-world ambient storage. With these materials, eighty percent of failures happen not during printing, but during slow degradation afterward

Let's be clear: edible packaging and bio-based substrates will not become main revenue drivers for commercial printers in the near term. Still, three steps are worth taking today:

First, add rheological profiles to your supplier evaluations instead of looking only at color gamut and price. Second, establish internal acceptance protocols for non-traditional substrates, even if it is just a basic shelf test with side-by-side image tracking. Third, keep tracking food engineering and material science research. The formulation advances happening there today will reach your pressroom in five to ten years

To be clear, if your process permits it, conventional UV or heat-set curing remains the most dependable option. There is no need to force experimental formulations onto standard jobs. Also, food-contact materials face strict regulatory and hygiene barriers that extend far beyond mechanical printability

・Printability is not a single number, but the intersection of three conditions: flowing under shear, stopping on demand, and holding its shape over time

・With no supporting substrate to rely on, 3D food printing forces materials to be self-supporting, creating the cleanest stress test for specialty substrate printability

・Research on Tremella fuciformis polysaccharide in pea protein gels demonstrates that printability can be systematically tuned through additives, rather than relying solely on press adjustments [1]

・Commercial print quality traditions, from flexographic process-to-quality mapping to packaging paper standards, provide the exact quantitative metrics new materials need for acceptance testing [2][4]

・Proofing non-traditional materials should be split into two stages: printability and shelf stability, separated by two to four weeks of ambient aging

For print manufacturers, the real opportunity is not buying new equipment, but building a proprietary material rheology database. Logging viscosity curves, recovery times, and aging degradation for every novel substrate creates a defensible basis for accurate quoting and yield forecasting that money cannot buy off the shelf. For designers, it means learning to discuss material behavior rather than pure visual styling, because the true bottleneck of novel materials is rarely whether they can be printed, but whether they survive the journey into consumer hands. AI has a clear opening here: the relationship between rheological parameters and production yield is non-linear and multi-variable. Once sufficient sample data exists, predictive models can pinpoint the printable window for a specific batch on a specific press faster than veteran press operators running physical trials. But that requires structured data logging, an area where most print shops are starting from zero. On the SaaS side, the most practical tool today is not an automated formulation engine, but a sampling genealogy system: a searchable record connecting material batch numbers, shop climate, lab measurements, and post-press shelf life, ensuring the exact recipe for that edible liner is not locked inside one operator's head. The remaining challenge is standardization. Until industry-wide acceptance criteria for non-traditional substrates emerge, collected data will struggle to translate across different pressrooms

[1] Rasheed, Wu, Rehman (2027). Tailoring the rheology, structural stability and printability of pea protein, κ-carrageenan hydrogels with Tremella fuciformis polysaccharide for 3D food printing. Journal of Food Engineering. DOI: 10.1016/j.jfoodeng.2026.113299

[2] ASTM International: ASTM Paper and Packaging Standards. ASTM International

[3] Journal of Graphic Engineering and Design: Flexographic Print Quality Research. Journal of Graphic Engineering and Design

[4] DiVA Portal / Karlstad University: PhD Dissertation on Flexographic Print Quality and Press Parameters (PDF). DiVA Portal / Karlstad University