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The Cyclos-HTP Institute, commissioned by BASF to conduct a series of tests, reported results showing that multi-layer films based on co-extruded PE and PA6 are recyclable for PE streams
.
The institute tested PA6 concentrations up to 30% in the original packaging film
.
The results are intended for the review of the PA6 classification in the Stiftung Zentrale Stelle Verpackungsregister (Central Agency Packaging Register) "Determination of minimum standards for the recyclability of packaging subject to participation in the system according to Article 21 (3) VerpackG (Verpackungsgesetz - German Packaging Act)" provide a basis
.
In Annex 3 of the standard, PA6 is listed as an "incompatible" ingredient, such as in the waste stream of the "Film and LDPE" packaging group
.
"We are delighted that cyclos-HTP can provide a scientific basis for the re-evaluation," said Dr.
Rolf-Egbert Grützner, Senior Manager Technical Support for Ultramid Extruded Polyamides at BASF.
"It is time to correct the classification of PA6 and related PA6/6.
6 copolyamides as ' incompatible' contaminants and put it on a solid basis for renewal
.
"
In addition to confirming the recycling compatibility of PA6 in PE flexible packaging waste streams, cyclos-HTP also listed PE/PA6 multilayer films as fully recyclable materials under certain conditions
.
In the original packaging film, in addition to the PA6 content up to 30%, the same is true for the use of so-called compatibilizers in the film structure containing PA6
.
This ensures uniform mixing of polymers that are incompatible at these concentrations, although this is not strictly necessary due to the dilution of PA6 in the actual waste stream
.
Certified PE/PA6 system compatibility in flexible packaging waste streams for new injection and blown film applications
.
Dr Roland Bothor, responsible for the eco-design and development project at the institute cyclos-HTP, confirmed: "It was surprising to us how positively the PA6 content in the analysed concentration contributed to the property level of the industrial PE recyclate as a reference.
.
"
