DRY PROCESSING OF CELLULOSE-CONTAINING COMBINED MATERIALS

Research has been carried out on dry processing of combined packaging materials – laminated foil production waste. This is a multilayer material, the main components of which are aluminium foil and backing paper made of very expensive high quality bleached kraft pulp. Its recovery and return to production is relevant. The work on separation in dry state of laminated foil into the main constituent fractions - fibrous and aluminium (coarse) – by means of aerodynamic disperser - a new unique multifunctional apparatus has been carried out. The apparatus fulfils two important functions at the same time - the dissolution of laminated foil production waste, which was considered non-recyclable, and the sorting of the recycled products. At the same time, the separation of the aluminium fraction (coarse) is so efficient that it has been accepted for use in powder metallurgy (JSC Rusal). In order to recycle the fibrous fraction (for reuse in paper production), studies were conducted, first of all, on removal of aluminium foil residues from it. Similar studies on the return of fibre obtained by processing of laminated foil into the technology of paper production have not been conducted in the Russian Federation. For this purpose, various methods of fibre fraction processing have been investigated. At this stage the results were obtained – the residues of aluminium foil in the fibre were brought to the content of about 1% (of the initial material it is 40%). Obtaining paper from the fibre fraction gives positive results: in terms of the main indicators of mechanical strength, a sample of the obtained paper is similar to the original base paper and paper for office equipment.