Dusting of cheese shreds dusting with an anticaking agent
Cheese shreds are either a consumer product or a semi-finished product used in the prepared-meal industries. To prevent the agglomeration of the shreds after grating and until the use, they are coated with an anticaking agent. There are several ways to do it.
Shreds are made by grating either traditional cheeses (Emmenthal, Cheddar) or specially processed cheese for this purpose. It usually has a relatively high moisture content and fat content, between 30 – 40% each. These amounts cause the agglomeration of the cheese after grating; thus showing a defective aspect or preventing the further processing in automatic dosing machines.
The powder coating is based either on :
Cellulose, microcristalline cellulose
Potato, modified wheat starch
In some case, powder flavours can be added into the mix to convey a distinctive aroma profile.
How does it work?
The coating process depends on the context. It consits merely in dosing and mixing. They may occur in different ways The process is simple
Dosing at a critical point of the system
The operation occurs usually in a rotary tumbler or rotating screw whose length and diameter are calculated to accommodate the product flow.
The coating relies on dispersion of the powder ingredients optionally, then on the mechanical dispersion caused by mixing.
Dispersion can be enhanced by distributing the powder prior to its fall onto the product:
by blowing air. Electrostatic is recommended to prevent pollution,
by using a vibratory scarf tray.
The product throughput needs to be recorded precisely (weigh band feeder, for example) in order to adjust according to the recipe the powder doser. The later can be volumetric or gravimetric, then offering a better precision and traceability of failure.
It is commonly continuous operation. Rotation speed is adjusted to achieve the required friction and residence time. The residence time is relatively short as powders tend to disperse easily.
Coating machine, courtesy of Transitube
How do you measure your success?
Key quality features
Although obvious, evaluation can be detailed.
The cheese shreds must not pack when pressed. No lumps should remain.
The cheese shreds must remain intact
No powder excess should appear in thepackaging
Key quality parameters
Although a simple process, its application can be resolved in multiple ways but with similar constraints
In some cases, dosage is made during shredding or conversely at the packaging machine. A specific system is recommended.
System design and operation
Multiple systems are suitable. The main design parameter is how the mixing is applied to the product and controled, how much the volume is contained in the system.
The dosage of the powder must follow consistently the flow of product wich is often varying.