Editor’s pickHRS brings packaged solutions for pasteurisation and sterilisation


Pasteurisation and sterilisation are now so well established that it is impossible to contemplate the production of production of many food and drink products without using these important techniques, said HRS Heat Exchangers.

Both pasteurisation and sterilisation involve the use of heat, usually in a way which does not affect the fundamental characteristics of the product. However, while sterilisation seeks to completely eliminate any micro-organisms which may be present in the product, pasteurisation reduces the microbial load by a “significant factor”, which in normal circumstances reduces them to a level at which they do not pose a hazard.

While simple plate heat exchangers may still be suitable for the pasteurisation of simple fluids such as milk and fruit juices, more textured and viscous products, such as cooking sauces, creams and curds, require different solutions to maintain their quality and texture. To meet this diverse range of requirements, HRS Heat Exchangers has created its Thermblock packaged pasteuriser/steriliser for food products for aseptic filling, as well as any other filling or packing method. Depending on specification and the intended use, Thermblock uses HRS tubular heat exchanger to deliver “effective and efficient” thermal treatment.

All HRS Thermblock systems allow for full adjustment of the heating-holding-cooling cycle of the product, so that it can be tailored to operators’ products and processing needs. They can also be used as high temperature, short time (HTST) units, subjecting the product to high temperatures for a short time to minimise potential side-effects, such as organoleptic changes or nutritional losses.

There are three models of HRS Thermblock:

HRS Thermblock DTA Series
This features a double tube pasteuriser and steriliser for food products containing pieces of particulates, such as fruit and vegetable dices. The steriliser comprises double tube corrugated heat exchangers from the HTS DTA Series, and also includes a positive displacement HRS BP Series piston pump which is designed for products containing large pieces.

Options for the Thermblock DTA Series include reception, air-removal and product impulsion sections to help ensure the absence of air during the thermal treatment stage. The HRS Thermblock DTA Series can be employed for applications such as diced tomatoes, onions, and fruits; as well as products with large particles, such as soups and sauces, baby food, jams and marmalades.

HRS Thermblock AS Series
This is a packaged annular-space pasteuriser and steriliser solution for thermal treatment for pasteurising and sterilising food products with high viscosity. The steriliser is composed of concentric tube heat exchangers, or annular space heat exchangers from the HRS AS Series, which are particularly suitable for high viscosity products without particulates. Product flows in the central annular space, while the heating or cooling media passes through both the internal and external jacket.

The steriliser can also include a high-pressure piston volumetric pump with frequency converter capable of working pressures up to 180 bar, ideal for high viscosity products such as tomato paste or some purees. For lower pressure applications, or products with particulates, the HRS BP Series of piston pumps is recommended. The HRS Thermblock AS Series also features an automatic cleaning in place (CIP) system, and is applicable for products including: tomato pulp and paste, ketchup and pizza sauce, fruit puree and concentrate, jams and marmalades, etc.

HRS Thermblock M Series
The M Series is for food with low or medium viscosity. The steriliser is composed of multi-tube corrugated tube heat exchangers from the HRS MI Series and HRS MR Series. A key feature is that is can be designed to include direct or indirect energy recovery, which means that up to 90% of the energy can be reused, thus reducing overall energy consumption and improving the return on investment.

Applications for the HRS Thermblock M Series include juices and beverages, fruit and vegetable purees and concentrates, milk and dairy products, and smooth soups and sauces.

Offering a comprehensive range of pasteurisation and sterilisation options for food and drink producers and with more than 30 years’ experience globally, HRS Heat Exchangers is committed to support operators with pasteurisation and sterilisation solutions for their process.