PROCESSING FROZEN COMPOSITIONS

摘要

An industrial method for tempering or softening frozen organic materials, such as foodstuffs, in such a way that the temperature difference in the product due to handling, size or/and skin effect and microwave absorption is neutralised by initial application of a non polar non ionic cooling followed continuous microwave radiation. In order to keep the product penetration high for thick products, the surface of the organic material is frozen/cooled with non polar non ionic cooling media before the application of the microwave radiation. No cooling is applied during the microwave heating. The temperature at the surface goes down to up to -40°C and more to prevent not only local thawing, also to allow self correcting control of the heating rate. Microwave heating reduces the process time, energy needs and leads to quality improvements.