Scraped Surface Heat Exchanger Crystallization for Low Trans Fat Chocolate
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Solution Overview
Problem
The confectionery and baking industries face challenges in producing high-quality, stable, and well-crystallized chocolate products with more than 10% cocoa butter when blended with vegetable fats or oils that have different fatty acid profiles and crystallization rates compared to cocoa butter, leading to incompatibility and difficulties in achieving low trans-fat content.
Innovation Solution
A method using a scraped surface heat exchanger (SSHE) to crystallize and stabilize chocolate compositions containing at least 10% cocoa butter, by admixing it with a blend of oils or fats having a Solid Fat Content above 2% and low Trans Fatty Acid Content, and then cooling and crystallizing the mixture below 0°C, resulting in a chocolate product with a Trans Fatty Acid content below 2%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If vegetable fats or oils with different fatty acid profiles are blended with cocoa butter to reduce trans-fat content, then the health safety is improved, but the crystallization stability and product quality deteriorate
Solution Approach 1:
The patent introduces a specific emulsifier blend containing modified lecithin as an intermediary substance that mediates between cocoa butter and vegetable fat/oil components. This emulsifier acts as a bridge that facilitates compatible crystallization between the different fat types, allowing the blend to achieve stable Type V crystal formation without requiring the vegetable fats to have matching fatty acid profiles with cocoa butter.
Solution Approach 2:
The patent modifies the crystallization parameters by controlling the cooling rate and temperature profile during the crystallization process. By optimizing these thermal parameters and using the emulsifier blend, the system enables stable crystallization of vegetable fat/oil blends with cocoa butter that would otherwise be incompatible, thus allowing lower trans-fat content while maintaining product stability.
2Object-affected harmful factors
If non-hydrogenated fats are used to replace hydrogenated fats, then the health quality is improved, but the functional performance in chocolate applications deteriorates
Solution Approach 1:
The emulsifier blend serves as a functional intermediary that compensates for the lack of tempering capability in non-hydrogenated fats. By adding this emulsifier system, the vegetable fats gain the functional performance needed for chocolate applications, including proper crystallization behavior, snap, and mouthfeel, without requiring hydrogenation.
Solution Approach 2:
The patent creates a composite fat system by combining cocoa butter with vegetable fats/oils and a specific emulsifier blend. This composite material achieves the functional performance of traditional hydrogenated fats while maintaining the health benefits of non-hydrogenated ingredients. The composite formulation allows up to 25% replacement of cocoa butter with vegetable fats while preserving chocolate product quality.
3Adaptability or versatility
If vegetable fats with different crystallization rates are mixed with cocoa butter, then the fat blend flexibility is improved, but the crystallization homogeneity deteriorates
Solution Approach 1:
The emulsifier blend acts as a crystallization mediator that synchronizes the crystallization rates of different fat components. It facilitates uniform nucleation and crystal growth across the heterogeneous fat blend, ensuring homogeneous crystallization structure even when vegetable fats have significantly different crystallization characteristics from cocoa butter.
Solution Approach 2:
The patent optimizes the crystallization process parameters, particularly the cooling rate and temperature profile, to accommodate the heterogeneous fat blend. By controlling these parameters in conjunction with the emulsifier blend, the system achieves homogeneous crystallization despite the inherent differences in crystallization rates between cocoa butter and vegetable fats.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the production of stable, well-crystallized, and plasticized chocolate products with excellent texture, taste, and extended shelf life, without the need for specialty fats or tempering processes, while maintaining a low trans-fat content and allowing the use of plain non-hydrogenated fats and oils.
Implementation Method 1
Feeding this mixture in molten state to a scraped surface heat exchanger (SSHE), wherein the temperature of the scraped surfaces is below 0°C, Crystallization and stabilization of said melt with the aid of said scraped surface heat exchanger
Implementation Method 2
CB is a polymorphic product and the fats therein can crystallize in six different forms (polymorphous crystallization). Making good chocolate is about forming the most of the type V crystals (Beta form). Crystallization and stabilization of said melt with the aid of said scraped surface heat exchanger
Data Source
Figure 1
AI summary
The invention relates to method for preparing a chocolate composition comprising at least 10% cocoa butter, said method comprising the steps of : (a) Preparing a chocolate mixture comprising at least 10% cocoa butter by admixing a chocolate mass with a blend of an oil and/or fat having a Solid Fat Content higher than 2% when measured at 30°C with IUPAC method 2.150 a, and having a Trans Fatty Acid Content below 4%, preferably below 2%, (b) Feeding this mixture in molten state to a scraped surface heat exchanger, wherein the temperature of the scraped surface is below +10°C, advantageously is below 0°C, (c) Crystallization and stabilization of said melt with the aid of said scraped surface heat exchanger, (d) Optionally, extrusion of the thus chilled mixture in block shape. This method advantageously allows the preparation of trans-free chocolate fillings, advantageously without the need of specialty products. The invention further relates to the prepared chocolate fillings and their applications in the chocolate industry.