High-pressure pasteurization (HPP process) dramatically reduces the thermal load of food and leaves valuable ingredients such as vitamins and natural colours and aromas unchanged. In contrast to traditional high-pressure processes in which pressure is transferred via a transfer liquid (frequently water) and a plastic vessel onto the food, Hammelmann technology enables the direct compression of liquid food products. This enables high production volumes to be pasteurised at a low cost. Furthermore, the texture of the food product can be specifically influenced which enables the creation of new products with changed product features.
Direct high-pressure pasteurization has one crucial benefit: High-pressures and high shear forces can efficiently eliminate germs and bacteria. Added to this, direct high-pressure pasteurization is very economical as no energy for heating is required. Because the liquids flow directly through the food products pump, no wastewater is created.
The high-pressure pump has a liquid part developed specifically for use in the food industry and which essentially builds on the well-known Hammelmann high-pressure technology. All fluid-touching components are FDA-certified and authorised for food processing. high-pressure seal is created through the patented Hammelmann sealing system with metallic sealing bushing and tungsten carbide pistons which minimises the risk of food contamination through seal abrasion.
The high-pressure valve reduces the pressure and exposes the liquid to high shear forces which results in micro-organisms being destroyed and the shelf-life of the product being considerably extended. The food product is homogenised and pasteurized in one single cycle depending on operating pressure the temperature at the valve outlet is significantly higher than the inlet temperature so that upstream or downstream cooling of the conveyed medium may be required.
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Read our brochure on process technology and pumps "Start your Process" online or download it conveniently as a PDF.