Layer Cakes – Pasteurized Cream
Preparation of Cream – Fully automatic Process
Dosing of Ingredients
Water: dosed automatically through an electromagnetic flow meter
Oil: dosed automatically through either a mass or a volumetric flow meter
Powder ingredients: dosed manually directly through the manhole or connected to an automatic powder dosing system
Mixing of ingredients
In our PCSD tank, the bottom impeller (1450 rpm), the electroemulsifier (1450 rpm) and the anchor agitator (23 rpm) are activated to make sure all the ingredients are homogeneously spread into the mix. In this phase the product reaches a temperature of about 60°C.
Once the mixing process is over and the mix is ready, the product is pumped to a buffer tank, after which the process will swith from batch to continuous. The buffer tank holds the product at the given temperature while keeping it under a gentle agitation.
Thermal process 1 – Continuous Pasteurization
The product is continuously pumped from the buffer tank to a series of 4 (or more if necessary) Scraped Surface Heat Exchangers (SSHE). The first SSHE, through the passage of steam in its double jacket, takes the product to pasteurization temperature (usually around 85°C). The product then goes through a holding pipe that guarantees the completion of the pasteurization process with the correct holding time.
Thermal process 2 – Continuous Cooling (crystallization and aeration)
The remaining SSHEs are in charge of the cooling of the product. The cooling medias are usually tower water and glycol. This section of the process is of key importance to the crystallization of the product. Crystallization is the process through which the product goes from liquid to semi-solid (cream) and its succesful achievement is what gives the desired texture to each single cream. About half way through the cooling process, Nitrogen (or air) is injected into the product and then spread into all its volume by the mechanical force given by the scraping blades allowing the cream to achieve the set density value.
The product is now ready to be pumped to the extrusion system and layed down onto the sponge cake layer. Soren’s extruders are specifically designed to be connected to the C.I.P. return line during the washing cycles, thus allowing the operators to avoid the long and complicated dismounting process.
Why choose water-based creams
A standard cake consists of two elements: sponge cake and cream.
These two elements will interact with each other during the whole shelf life of the product by constantly transferring chemicals to one another.
This phenomenon, called migration, takes place due to the natural tendency of a system to achieve overall balance including, of course, chemical.
The reason why this phenomenon is relevant to cakes is water activity (Aw), that represents the amount of water contained in a product that is “free to move” within the product and to interact with other elements.
Here are typical values of sponge cakes and both water-based and fat-based creams:
– Aw SPONGE : 0,74
– Aw FAT-BASED CREAMS : 0.65
– Aw WATER-BASED CREAMS : 0.74
These values indicate that, in cakes filled with fat-based creams, water will naturally and gradually migrate from the sponge cake to the cream until Aw values are equal. As a result, after as little as two months of shelf life, the sponge cake will become dry and the product will no longer have its original sensorial qualities.
With Soren’s water-based cream technology it is now possible to avoid water migration by matching perfectly the water activities of sponge cake and cream, thus allowing the product to keep its original qualities all through its shelf life.
Water-based creams contain a much higher quantity of water which, combined to the fact that they are oil in water emulsions (not water in oil, like fat-based creams) makes them much fresher and much lighter to the customer’s palate.
Being fat the most expensive ingredient in the recipe, a cream with a much lower amount of fat will reduce the cost of the single unit
Water based creams significantly reduce the calories and the amount of fat of the product