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Sunday, 22 September 2019
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Raw materials & technologies, Raw materials, Coatings additives

Studying new multilayer structures for flexible packaging applications

Wednesday, 23 July 2014

Waterborne polyurethane adhesives for the flexible packaging industry have been selected to study new multilayer structures for flexible packaging applications.

Waterborne polyurethane adhesives for flexible packaging have been studied

Source: Miroslaw/Pixelio

Waterborne polyurethane adhesives for flexible packaging have been studied

Source: Miroslaw/Pixelio

A research project conducted by the Department of Food, Environmental and Nutritional Sciences of the University of Milan has investigated the possibility of laminating polyester CNC (Cellulose Nano-Crystals) coated films to a polyolefinic layer by using Sapici waterborne specific polyurethane adhesives.

Use of nanocellulose is most promising

The best values in terms of oxygen-barrier and mechanical properties have been obtained with the combination of PET coated (CNCs) / PE. The results of the project, aimed at evaluating the feasibility for demanding food packaging of novel multilayer structures, make it possible a complete low impact process: CNCs, the efficiencies of nanotechnologies from renewable resource, no emission waterborne adhesives, one plastic barrier film less. The final packaging (PET /CNC /waterborne PUD adhesive / PE) shows gas and vapour barrier, and it is now opening new sustainability routes for the food packaging industry. "The use of nanocellulose as a barrier coating on common flexible materials, protected by polyolefin layer by means of adequate adhesives, seems the most promising application in the field,” articulated professor Luciano Piergiovanni of the University of Milan.

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