Laminated materials have many technical advantages, but they present a significant problem when it comes to recycling due to the differences in melting points between the polymeric materials that make them up, thus restraining them from being reprocessed by extrusion. The traditional methods used for delamination are based on selective dissolution, in which each layer is solved using organic solvents. These solvents present environmental and safety problems since they are toxic and flammable. On the other hand, because of the price of the chemicals, these methods are not feasible for most laminated materials.
The technology owner has developed a patent pending procedure for the delamination of multilayer film or laminated plastics. The procedure uses micro-needles in a micro-perforation device, comprising at least a pair of double rollers rotating in opposite directions, to make micro-perforations in crushed laminated plastic material and then introduced into a reactor so that water-based agents can access the interlaminar zone of the laminated plastic material and remove the ink and adhesive.
The method was tested with different types of laminates at laboratory scale: PE/PET, PP/ink/PP, PP/aluminium/PE. The technology owner is keen to collaborate with a company through technology licensing agreement. The company should be responsible for the development of the industrial prototype (500 kg/h with an estimated cost of EUR1.2 mil), the validation of the technology, its installation and its introduction into the market. The technology owner will provide technical assistance in each step. The technology owner would also be interested in establishing technical cooperation agreements to further develop the laboratory-scale prototype, to find new applications or to adapt it to the company’s needs.
The proposed technology has the following features:
The procedure consists of the following steps:
This procedure could be useful in the plastic recycling sector since it can be applied to different types of laminates from plastic waste of both industrial or domestic origin.
This technology has the following advantages: