Neutralization by Filler

Process for adjusting the pH value and/or for neutralizing acidic and/or basic compounds, in particular degradation or decomposition products, as part of the reprocessing and recycling, in particular of thermoplastic materials, where in a first step the polymer material to be recycled is presented on a cutter compactor equipped with a mixing and comminuting arrangement, and where subsequently the polymer particles are permanently agitated and heated, characterized in that to neutralize the resulting degradation and decomposition products, in particular organic dyes from printed surfaces, at least one filler in powder form is added to the softened but not yet melted polymer, namely at a quantity that corresponds at least to the anticipated acidic and basic load, whereby for a certain dwell time, the mixture is permanently mixed, agitated, comminuted if appropriate, held in chunky and free-flowing form.