Industry experts agree that Mass Flow is the preferred discharge pattern when dealing with powder processing.
Mass Flow ensures that a mixed product remains consistent throughout the production process, right through to the final product.
Consistency of recipe formula isn’t only vital when dealing with nutritional or medicinal preparations, where ingesting too much of one ingredient could be harmful. But inconsistencies in other foods , such as beverage mixtures, could result in a poor consumer experience and damage to your brand.
What is Mass Flow?
As covered on our page about Powder Mix Segregation, Mass Flow is defined as:
“All the powder being in motion across the whole of the container whenever any is withdrawn. Mass Flow produces a first in-first out flow sequence, eliminating any stagnant areas, and providing a steady discharge with consistent bulk density, and a flow that is uniform and well-controlled.”
Mass flow is generated in Cone Valve IBCs or hoppers with a geometry specifically designed to create that flow.
How to design for Mass Flow
Mass flow can be achieved by implementing effective design solutions in the following areas:
- Hopper, bin or silo’s internal surface friction
- The hopper’s angle
- The type of valve being used
Problems with traditional solutions
The opposite of Mass Flow is what is referred to as “Core Flow” or “Funnel Flow”. Core Flow refers to when powder particles flow mainly from the centre of the container, above the outlet, during discharge, leaving material on the sides of the container and causing particle rolling and separation of the mix This material can get caught up and not easily come out of the IBC. Core/funnel flow occurs in slide valve or Butterfly valve IBCs.
The traditional solution for butterfly valve IBCs — much to the frustration of systems operators everywhere — has been to stop the line entirely and then walk around with a mallet and hammer the containers (hoppers, silos, etc.) until the material in the bin starts to flow. Not very high-tech or equipment friendly.
Several problems present themselves with this “solution”:
- Damage to expensive containers in the long-term
- Halted production, thereby wasting resources and increasing operating costs
- Doesn’t solve inconsistencies in the recipe inside the containers (in fact, it can add to them)
Another problem with Bins which use butterfly or slide valves is a problem called “arching” or “bridging”.
Differences in size, shape and density of powders in a mixture can result in materials interlocking or bonding together to build an “arch” above a container’s outlet.
If any of the powder above that outlet has bonded together, forming a bridge, no powder can escape. The flow of powder stops.
Again, the solution is to “Stop the line and bring out the mallets!”
Mass Flow works on a “First In, First Out” principle meaning that product is discharged in the same order that it went into the bin. Mass flow in a Cone Valve IBC encourages all material to flow out of the bin, meaning there is little residue left in.
On the other hand the Butterfly/slide valve IBCs that experience Funnel/Core Flow which works on a “First In, Last Out” pattern – will have ageing powders inside containers, which can lead to caking, oxidation and general spoilage.
But the problem is exacerbated when powders have bonded at the sides of a container, leaving them there far longer than they should be.
Until now, it has been a matter of deciding what is more costly:
- Ruined product due to spoilage?
- Or no product at all as a result of stopped lines while operators hammer away?
The Matcon Cone Valve
The patented Matcon Cone Valve is a revolutionary design which accounts for bridging, arching and core flow as a result of:
- An innovative cone-shaped design
- Raising and lowering the valve at the discharge outlet
- Internal vibration of the cone as it lifts
The cone shape of the valve, the raising and lowering of the valve at discharge, as well as the internal vibration, all assist in facilitating mass flow.
The Matcon Cone Valve is an integral part of our IBCs which have also been custom-designed to ensure mass flow of product.
Confidence that a line will remain in production, as a result of consistent product flow, means that the discharge process can be automated.
No more stopping the line and halting production while operators dig in their bottom drawers and pull out their trusty mallets.
Stimulating cohesive materials to flow
The Matcon Cone Valve integrates vibration right into the cone at the top of the lifting cycle.
This action stimulates even the most stubborn powders (whey protein and flour are notorious) to flow downwards. Bridging potentiality is thereby reduced.
On the contrary, if the powder flows freely (e.g. sugar), the cone’s lift can be reduced so as to control the quantity of flow at discharge.
the confident certainty that a line will continue running would not be possible were it not for our innovative Cone Valves which are integrated into each IBC.