Use of Recycled Plastics in
Food Contact Materials in Europe
The use of recycled plastics, especially within Food Contact Materials (FCMs), is challenging but necessary due to a global convergence on concerns around the environmental impact of plastic. Sustainability objectives and the drive to a circular economy is an increasing demand for all recycled materials, and in particular plastics in packaging. Both, consumer demands and legislative changes have mandated a shift towards manufacturers reducing single-use plastics and the wider implementation of a circular economy.
The use of recycled plastics for FCMs is governed in the “COMMISSION REGULATION (EC) No 282/2008 on recycled plastic materials and articles intended to come into contact with foods” and the corresponding amendment “COMMISSION REGULATION (EU) 2015/1906”. They set out specific measures for recycled plastic materials and articles in Europe, supplementing the “Framework Regulation” (EC) No 1935/2004 and apply only for plastic waste, which has been treated mechanically and for the resulting plastic which comes afterwards into contact with foodstuffs. This means, that chemical recycling (via depolymerization) as well as recycled plastic, which is used behind a functional barrier, are not in the scope.
Authorized recycling process necessary
The recycled plastic covered by this Regulation must come from an authorized recycling process, managed according to rules set out in the Annex of the “GMP Regulation” (EC) No 2023/2006. Furthermore, the Regulation specifies that the plastic input either comes from a closed, monitored product cycle (e.g. PET bottles) or it has been demonstrated, e.g. in a “challenge test”, that the process is able to reduce contamination of the starting material to concentrations, that do not pose a risk to human health. It has to be pointed out, that there is currently a draft amended version of the Regulation (EC) No 282/2008 under discussion, which in a first step deals with the details of recycled PET. This draft is expected for 2021, whereas further amendments with all recycled plastics in the scope, as well as chemical recycling and an updated 2-step application process, are expected later.
Regulation (EC) No 282/2008 requires, that the recycling process used to manufacture the food contact plastic must have a valid application for an EFSA (European Food Safety Authority) opinion or already have an EFSA opinion covering its intended food use. It is planned, that the processes which have gained a favorable opinion from the EFSA will be included by the European Commission in a register of approved processes and only these processes will be permitted for food use materials.
EFSA guidance document
For the details, EFSA prepared a guidance document in 2008, which specifies the administrative and technical data that applicants should submit in a dossier for the safety assessment of a plastic recycling process (EFSA Journal (2008) 717, 1-12). The dossier shall be composed of three sections: a summary document, an administrative part to identify the legal entities and the business involved and a technical dossier. Here the application should be described clearly, with a description of the type of plastic and, in general terms, of the main key steps of the process, especially those contributing to removal of potential contaminants. Moreover, information on the intended use of the recycled plastic such as percentage in the final article, single-use or repeated-use applications, food types and contact conditions should also be provided.
Afterwards, the EFSA will, where appropriate, issue opinions, recommendations, specifications or restrictions on the input, on the recycling process or on the use of the recycled plastic. It should be noted that these guidelines do not cover environmental aspects such as persistence in the environment, ecological impact of food contact materials constituents and their fate after the food contact material has been submitted to waste disposal treatment.
An interactive step-by-step guide is published by EFSA on their webpage.
EFSA scientific opinion on mechanical recycled PET
One of the first available EFSA publications regarding recycled plastics is the “Scientific Opinion on the criteria to be used for safety evaluation of a mechanical recycling process to produce recycled PET intended to be used for manufacture of materials and articles in contact with food” from July 2011. Most knowledge on recycling exists for PET as it is by far the worldwide most frequently recycled polymer for food contact uses. Furthermore, it is characterized by a limited range of additives used and a low diffusion of potential migrants in the polymer matrix. The risks associated to the use of recycled plastic materials in contact with food arise from the possible migration into the packaged food of contaminants present in the recycled plastics. In the case of recycled PET, the following contaminants are amongst others considered by EFSA:
- Contaminants from possible misuse: PET containers used for food may be misused by consumers after food consumption to store chemicals
- Chemicals from non-food consumer products: PET containers can be used in contact with non-food products (cosmetics, personal hygiene products, household cleaner) and sorb nonfood substances
- Chemicals used in the recycling process: Chemicals such as detergents and alkali used for the washing represent another possible source of contamination
- Degradation products of the plastic: During the various steps of the recycling process, e.g. high temperature treatments, the polymeric chain may break down to smaller molecules and any additives or sorbed compounds may react and be converted into new compounds
The “Challenge Test”
Taking into account the above mentioned potential sources of contamination of the input, it has to be demonstrated, that the process is able to reduce contamination to levels not posing a risk to human health for the intended use of the final product. This is generally achieved by a so-called “Challenge Test”1. For this purpose, plastic is highly contaminated with model chemicals as surrogate contaminants. The choice of these substances should cover the physico-chemical characteristics and properties of potential contaminants. A possible mixture could be: Toluene / Chlorobenzene / Phenyl cyclohexene / Benzophenone / Methyl stearate. This mixture of surrogates cover not only a wide spectrum of volatility and polarity properties but also the full range of migration-relevant molecular weights. The contaminated plastic is then introduced into the recycling process and the residual concentration of the surrogate contaminants is determined after the process, hence yielding the decontamination/cleaning efficiency of the recycling process. As a conclusion, the EFSA Panel considered appropriate that the proportion of PET from non-food consumer applications should be no more than 5% in the input to be recycled.
EFSA opinion on mechanical recycled polyolefines
To date around 70 scientific opinions or safety assessments resp. have been published by the EFSA and most of them (> 50) are related to PET processes. More difficult is the situation in regard to the mechanical recycling process of polyolefins for the subsequent use as FCM. Due to the higher migrant affinity of PP or especially PE, caused by the lower polarity, the process must be seen more critically.
Therefore, until now only 4 scientific opinions dealing with the use of recycled polyolefines are published by EFSA with the conclusion, that the requested recycling processes are of no safety concern for PP and/or HDPE crates or trays intended to be used in contact with whole fruits and vegetables at room temperature or below. In one case the panel noted the limited decontamination efficiency under the condition of the challenge test and concluded, that the process for the manufacture of recycled HDPE bottles for milk and fruit juices does not meet the selected safety criteria.
1 Surrogates in a challenge test: R. Franz, F. Bayer, F. Welle: Guidance and Criteria for Safe Recycling of Post Consumer Polyethylene Terephthalate (PET) into New Food Packaging Applications; EU-Project FAIR-CT98-4318 "Recyclability" February 2003
The poor quality of recyclates (i.e., material intended to be recycled) is a major roadblock to increase the amount of plastic food containers that are recycled. In October 2017, the European Plastics Converters Association (EuPC) published the results of a survey on the use of recycled plastic materials in Europe’s plastics-converting industry. The survey, which included 485 participants from 28 countries, found that the quality of plastic materials available for recycling is the biggest barrier to a greater use of recyclates as raw materials. Almost 60 percent of the European plastics-converting companies find it hard to get a supply of recycled plastics materials that meet their quality standards.
Difference between PIR and PCR
In this case the difference between Post-Industrial-Recyclates (PIR) and Post-Consumer-Recyclates (PCR) is important. Whereas PIR has often a high quality, as these recyclates were generated during the industrial production of products and hence were not yet in circulation as packaging, the necessary quality of PCRs must be seen at the moment very critically, especially for the use in FCMs. These recyclates origin from household or commercial plastic waste and consist of much more different materials, which have to be sorted and cleaned first. Nevertheless, both recyclates have to be analyzed for the identification and the concentration of any substances which are able to migrate afterwards into the foodstuff.
Deinking of printed packaging
An important topic for the quality of the recyclates in regard to printing inks is the deinking of the printed packaging. In this case the ink will be removed from the surface of the plastic packaging material prior to the reprocessing of the film. Typically a recycled film without removing of the ink results in a recyclate where the color depends on the pigments of the ink. It often ends up as a grayish colored recyclate. Therefore, a successful deinking is essential to receive a recyclate which is as transparent as feasible. For a further improvement of this process, Siegwerk works on inks, lacquers and primers which are easy to remove and on an optimization of the deinking process.
Moving away from a take-make-use-dispose (linear) model to a circular model is paramount for packaging. Siegwerk is clustering its activities into two fields of action: Design for Less, meaning less plastic by substituting with renewable materials such as paper & board and Design for Recycling, which means providing solutions that increase the recyclability of materials. More information about Circular Economy and the involvement of Siegwerk are available on our corresponding webpage.
Plastics and plastic recycling
4.1 Siegwerk’s proprietary deinking and delamination primer technology helps to yield clean recyclates
4.2 Dr. Stefan Häp, Head of Technology and Innovation BOC at Siegwerk, explains the deinking process
4.3 Deinking explained easily
5. Review Articles
5.1 A recycler’s perspective on the implications of REACH and food contact material (FCM) regulations for the mechanical recycling of FCM plastics
5.2 Mechanical Recycling of Packaging Plastics: A Review