Packaging materials and methods for dairy applications
18 August 2016 • Author(s): Professor Kata Galić, Faculty of Food Technology and Biotechnology, University of Zagreb
Milk is the best example of a food product that, due to processing technology, packaging material and method, is able to extend its shelf life from hours into weeks and months.
The first packaging of milk came with the introduction of sterilised milk processing, in which the glass bottle formed an integral part. The glass bottle as the retail package for milk was used until the 1930s, at which time waxed paper was introduced. The development and introduction of plastic materials, both alone and in combination with paper, resulted in a wide range of containers suitable for dairy products packaging.
The shelf-life of bottled fluid milk is reported to average between 10 and 21 days when stored at 4-8°C1. The shelf life varies depending on raw milk quality, processing conditions, microbial growth, packaging materials2, exposure to light2, 3 and temperature abuse4.
The dairy industry is able to achieve a 45-day shelf life through the use of ultrapasteurisation (UP) processes, while ultra-high temperature (UHT) processed products achieve a shelf life of three months to one year with no refrigeration5. The shelf life study, by Petrus et al.4 evaluated the influence of storage temperature on the microbiological stability of homogenised whole pasteurised milk packaged in different polyethylene (PE) monolayer materials, pigmented with titanium dioxide (TiO2). Based on the results of the study, high-density polyethylene (PE-HD) bottles were better for storing pasteurised milk compared with that of a low-density polyethylene (PE-LD) pouch (Table 1, see below).
ABF Ingredients ANDEROL EUROPE BV Avantes Berndorf Band GmbH BIOTECON Diagnostics GmbH Cargo Oil AB Elea GmbH Engilico FUCHS LUBRITECH GmbH GLOBALG.A.P. Foodplus GmbH InS Services (UK) Ltd IONICON Analytik GmbH JAX INC. JBT Corporation LUBRIPLATE Lubricants Company NETZSCH Pumpen & Systeme GmbH NSF International Ocean Optics PCE Instruments UK Ltd R-Biopharm Rhone Ltd Stancold SteriBeam The Tintometer® Group Thermo Fisher Scientific TOMRA Sorting Food Uhde High Pressure Technologies GmbH Verner Wheelock Vikan UK Ltd