When a gelatin supplier change moves Bloom strength by 10%, for example from 250 Bloom to 225 Bloom or from 250 to 275, KorNutra treats it as a meaningful change, not a simple substitution. Bloom strength measures gel rigidity and rises with average molecular weight: it is the force, in grams, needed to press a 12.7 mm plunger 4 mm into a 6.67% gelatin gel that has set for about 17 hours at 10 °C. A 10% shift changes how the gel mass flows, sets, dries, and behaves downstream.
Second-order effects on depositor speed
The depositor is the first place the changed gelatin shows up. A 10% Bloom shift can shift the entire speed-pressure-temperature window.
- Lower Bloom gel mass: At the same temperature and pump speed, it flows more easily. This can look like an opportunity to increase depositor speed, but the more common result is tailing, stringing, splashing, and fill-weight drift unless the fill volume is recalibrated. Operators may have to reduce speed to keep cavity fill and piece weight consistent and avoid air entrapment.
- Higher Bloom gel mass: The mass becomes more viscous and builds higher back pressure at the nozzle. Depositor speed may need to be slowed, or the melt temperature raised. If speed is pushed without adjustment, you can see weeping at pump seals, nozzle clogging, short fills, and more rejects.
So the second-order effect on depositor speed is a combined shift in fill weight, piece geometry, and nozzle behavior, and it requires re-validation rather than a simple speed change.
Second-order effects on cure time
Cure time is strongly affected because Bloom strength is tied to how quickly and firmly the gelatin network sets.
- Lower Bloom gelatin: The piece is softer at the same moisture level, so the product often needs more moisture removal to reach the same target hardness. That can extend cure and drying time. However, drying too aggressively can cause the surface to harden while the interior remains wet, which creates later packaging problems.
- Higher Bloom gelatin: The piece may firm up sooner, but it can also form a tighter surface film that slows moisture migration from the center. This can change the shape of the drying curve even if total time stays close to the original.
In practice, a 10% Bloom shift usually means re-establishing the drying curve, tray load, airflow, and humidity targets rather than simply adding or subtracting a few hours.
Second-order effects on packaging seal integrity
Packaging seal integrity is sensitive to the residual moisture, hardness, and dimensional stability of the finished pieces.
- If cure time is not fully adjusted for lower Bloom: pieces may enter packaging with too much residual moisture. They can be soft, tacky, or dimensionally unstable, leading to clumping in the hopper, deformation under heat-sealing jaws, or seal breaches after the package cools.
- If higher Bloom pieces are over-dried: the pieces can become brittle, crack at the seal area, or generate dust and fines that interfere with heat-seal or induction-seal contact.
Seal integrity is a physical packaging attribute. The risk is about package containment and durability during normal handling and distribution, not about changing the supplement action itself.
Where the supplier change should have been caught
Bloom is a specification you buy to: a 250 Bloom lot and a 225 Bloom lot are different products with different certificates of analysis. A 10% shift should surface at incoming inspection, before the gelatin reaches the melt tank. Reviewing the certificate of analysis against the approved spec, and checking gel strength or viscosity on receipt, is cheaper than discovering the change as fill-weight drift at the depositor.
If the new lot is lower Bloom, a lower purchase price can be consumed by the requalification work this post describes: re-validating depositor settings, re-establishing the drying curve, and re-running packaging trials. The practical questions are whether the supplier notified you, whether the certificate of analysis matched the approved spec, and whether anyone checked before release to production.
Practical takeaway
At KorNutra, a 10% Bloom change from a gelatin supplier would trigger a re-qualification of gel mass viscosity, depositor settings, drying curve, and packaging line setup. The first-order question is simply “did the Bloom number change?” The second-order question is whether the entire wet mass to dried piece pathway is still in control.