At KorNutra, we treat the trade-off between rapid depositing and splashing as a core control problem in syrup manufacturing. A low-viscosity syrup flows fast through the nozzles, which keeps fill speeds high, but the thin stream carries little internal resistance and fragments into droplets when it hits the mold. A high-viscosity syrup resists splashing by depositing as a slow, cohesive stream. But it slows the fill. The balance sits in the rheology of the syrup at the moment it leaves the nozzle.
The exact rheology at depositing temperature, typically around 60-80°C for many syrups, governs this balance through two properties: viscosity and yield stress. A syrup with enough yield stress holds together as a stable pool on impact instead of flying apart, but its viscosity still has to stay low enough to move through the nozzles quickly. Heat lowers viscosity and keeps the line fast. Splashing, though, is decided at the instant of impact, before any meaningful cooling. The impact velocity, viscosity, and surface tension together set the splash threshold (the Weber and Ohnesorge numbers), and cooling thickens the landed pool only afterward, helping it hold shape and set.
The deeper problem is that a plain sugar or glucose syrup is Newtonian: at a fixed solids content its viscosity depends on temperature but not on shear rate, which leaves a narrow window between fast flow and a controlled landing. Gummy syrups that already carry pectin, gelatin, or starch sit outside that picture, since those hydrocolloids are shear-thinning in solution, but the speed-versus-splash balance still has to be tuned case by case.
How Non-Newtonian Additives Could Break the Trade-Off
Non-Newtonian additives change this equation by decoupling flow behavior from temperature. A shear-thinning (pseudoplastic) additive drops in viscosity under the high shear of the depositing nozzles, so it flows fast, then thickens again at the low shear of a landed pool, resisting splash. A thixotropic additive goes further: it thins while it is being pumped and recovers its viscosity over a short pause once motion stops.
Key mechanisms include:
- Shear-thinning agents (xanthan gum, modified starches): low viscosity under shear for fast filling, higher viscosity at rest for splash resistance.
- Yield stress additives (microcrystalline cellulose): set a stress threshold the syrup must exceed to flow; pump pressure clears it, and the landed mass stays as a cohesive blob rather than splashing.
- Viscoelastic additives (pectin): store elastic energy and spring back on impact instead of fragmenting into droplets.
These additives have to be selected carefully, because the same properties that resist splashing also cause trouble downstream. Elastic recovery that stops a splash can also resist a clean break-off at the nozzle, leaving a tail or string, and higher molecular weight hydrocolloids slow water migration, which can delay set and demold. At KorNutra, we specialize in formulating custom rheologies for this balance, adjusting the viscosity curve to your depositing temperature and equipment. By tuning the non-Newtonian profile, you can fill fast and land clean, breaking the traditional trade-off.
What the Added Hydrocolloid Does to Your Label and Set Time
Every additive that changes the viscosity curve also lands on the ingredient deck, and that matters as much as the splash. Pectin and clean-label starches read as natural on a supplement label, which is why confectionery producers use pectin to position gummies as plant-based and gelatin-free. Modified starches are more processed and sit less comfortably in a clean-label deck, and each added hydrocolloid is another line item, another supplier, and another variable in the gel network. The same additives change what happens after depositing: pectin comes in slow-set and fast-set grades, and swapping or adding hydrocolloids shifts set time, demold time, and texture. For most gummy formulas the real lever is the gelling system already in the syrup, so tuning the pectin or gelatin load usually beats adding a separate rheology additive. We run these trials on the bench before they reach a line.
Characterizing Your Nozzle and Impact Shear Rates
To implement this, characterize the shear rates and impact dynamics of your depositing process. Measure the syrup's viscosity at the shear rate your nozzle produces during discharge, and again at the near-zero shear of a landed pool. Match those two points with the right additive and you can cut splashing measurably without giving up fill speed. We recommend lab-scale trials to set the concentration and temperature response, and to confirm stability through storage and processing. Reach out to our team for a consultation on your specific formulation.