Method of recycling adhesive-coated plastic sheet material
AssigneeWNC-Nitrochemie GmbH
InventorsGerhard Huber, Karl Pichl
Life of this patent
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Abstract
A method is indicated of recycling plastic sheet material coated with adhesive and available in chopped form. The method provides for separating the plastic from the adhesive. In a first method step the chopped sheet material (4) is introduced into a solvent bath (1) where the chopped sheet material (4) is moved for a predetermined dispersing time under mechanical action. The mechanical action preferably is exercized by rolling or kneading. In a second method step, the adhesive dispersed in the solvent is separated from the chopped sheet material (4) by mechanical action of forces--preferably by introducing squeezing forces in a conveyor screw.
Claims11
A method, of recycling plastic sheet material coated with adhesive and available in chopped form by separating the plastic from the adhesive, comprising the following steps:
- a) moving the chopped sheet material for a predetermined period of time in a solvent for the adhesive through a multi-stage kneader, so that the adhesive will become dispersed in the solvent;
- b) subsequently separating the adhesive dispersed in the solvent from the chopped sheet material by mechanical force.
A method, of recycling plastic sheet material coated with adhesive and available in chopped form by separating the plastic from the adhesive, comprising the following steps:
- a) moving the chopped sheet material for a predetermined period of time in a solvent for the adhesive under the impact of a mechanical force in a first processing stage, so that the adhesive will become dispersed in the solvent;
- b) separating the adhesive dispersed in the solvent from the chopped sheet material by mechanical force in such first processing stage;
- c) feeding the separated chopped sheet material from the first processing stage to a second processing stage;
- d) feeding fresh solvent to the separated chopped sheet material in the second processing stage;
- e) moving the chopped sheet material for a predetermined period of time in the solvent for the adhesive under the impact of mechanical force in the second processing stage, so that the remaining adhesive will become dispersed in the solvent;
- f) separating the solvent-adhesive dispersion from the chopped sheet material by mechanical force in the second processing stage;
- and
- g) feeding the separated solvent-adhesive dispersion from the second processing stage to the first processing stage.
Dependencies are inferred from the claim text.