Solvent-based recycling with a roll-to-roll processing step
Subject-matter of the present invention is a method for removing at least one polymer component from plastic waste film material, wherein the plastic waste film material comprises at least a first polymer to be solved and a second polymer component, wherein the method comprises the steps of moving said plastic film material across at least one solvent bath which is filled with a solvent, wherein said solvent is a solvent for the first polymer component to be solved, and wherein at least the second polymer component is non-soluble in said solvent.
1 . Method for removing at least one polymer component from plastic waste film material, wherein the plastic waste film material comprises at least a first polymer component to be solved and a second polymer component, wherein the method comprises the steps of
(i) moving the plastic film material across at least one solvent bath, which is filled with a solvent, wherein the solvent is a solvent for at least the first polymer component to be solved, and wherein at least the second polymer component is non-soluble in the solvent,
wherein said plastic film material is rolled material,
and wherein said plastic film material is being passed by at least a rolling drum across at least one bath which is filled with the solvent.
2 . Method according to claim 1 , wherein the plastic film material is subject to mechanical pretreatment including a washing step.
3 . Method according to claim 1 , comprising a step of decolorization of the solved first polymer component.
4 . Method according to claim 1 , wherein the bath and the space above said bath are arranged in a gas-tight system.
5 . Method according to claim 1 , wherein the solvent bath has an average temperature of at least 30° C., preferably of at least 40° C., more preferably of at least 60° C., even more preferably of at least 80° C. even more preferably of at least 100° C., even more preferably of at least 120° C., even more preferably of at least 140° C.
6 . Method according to claim 1 , wherein the solvent is selected from the group comprising ketones such as acetone, butanone, esters such as ethyl acetate, benzyl acetate, organic acids such as formic acid or acetic acid, alkanes such as n-heptane or n-octane, cyclic alkanes such as cyclohexane and methylcyclohexane, water and/or mixtures thereof.
7 . Method according to claim 1 , wherein the solvent of the least one bath is an aqueous solution, wherein said aqueous solution is selected from the group comprising acids and bases, preferably NaOH, NH3, HCl, HNO3, acetic acid and/or mixtures thereof.
8 . Method according to claim 1 , wherein said first polymer component to be solved is selected from the group comprising polymeric components, additives, impurities, metal components, printing inks, adhesives and/or mixtures thereof.
9 . Method according to claim 8 , wherein the first polymer is selected from the group comprising low-density polyethylene (LDPE), polypropylene (PP), high density polyethylene (HDPE), polyamide (PA) and/or combinations thereof.
10 . Method according to claim 1 , wherein said second polymer component is selected from the group comprising secondary components, auxiliary components, polymeric components, additives, impurities, metal components, printing inks, adhesives and/or combinations thereof.
11 . Method according to claim 1 , a wherein the solvent is separated from the solved first polymer component by thermal solvent separation, mechanical solid-liquid separation, cross-flow filtration and/or Flash evaporation.
12 . Method according to claim 11 , wherein said plastic film material is delivered from the rolling drum(s) to an extruder.
13 . Method according to claim 1 , wherein said plastic film material is selected from the group comprising plastic waste, post-industrial use polymers and combinations thereof, complex plastics comprising numerous polymeric and non-polymeric components, plastic films, polymeric film, multilayer films, polymer multilayer films, foils, plastic foils, multilayer foils, trays, plastic trays, multilayer trays, plastic composites, metal-plastic composites, paper-metal plastic composites, paper-plastic composites.
14 . Method according to claim 13 , wherein said plastic film material is selected from the group comprising PE/Al/PET, PE/PET, PE/PA, PE/PP, and/or a combination of polymer/polymer, polymer/metal, polymer/metal/polymer etc.
15 . Method according to claim 14 , wherein said film comprises at least two layers, polymer/polymer or polymer/metal.
16 . Method according to claim 14 , wherein said layers of the multilayer film are selected from the group comprising a layer of polymeric components, metal layers, paper layers and/or combinations thereof.