This is the second edition of Holdsworth and Simpsons highly practical work on a subject of growing importance in this age of convenience foods. As before, it discusses the physical and engineering aspects of the thermal processing of packaged foods, and examines the methods which have been used to establish the time and temperature of processes to sterilize or pasteurize the food. However, there is lots of new material too. Unlike other texts on thermal processing, which cover very adequately the technology of the subject, the unique emphasis of this text is on processing engineering and its relation to the safety of processed foods products.
A fully revised and updated edition of a hugely practical work. Unlike other texts on thermal processing, which cover the technology of the subject, the unique emphasis of this text is on processing engineering and its relation to the safety of processed foods products.
1. 1. Thermal Processing Principles 1. 1. 1. ThermalProcessing A generation ago the title of this book would have contained such terms as canning, bottling, sterilization and heat preservation; however, with the passage of time it has become necessary to use a more general title. The term thermal processing is used here in a general sense and relates to the determination of heating conditions required to produce microbiologically safe products of acce- able eating quality. It conveys the essential point that this book is concerned with the heating and cooling of packaged food products. The only attempt to produce a generic title has been due to Bitting (1937), who used the term appertizing, after the process developed and commercialized by Nicholas Appert (1810) to describe the canning and bottling process. Despite the need for a generic term, rather surprisingly, this has never been used to any great extent in the technical press. The phrase packaged foods is also used in a general sense, and we shall be concerned with a valL