Process for recycling waste paper, product obtained therefrom and its uses
AssigneeUniversitat Politecnica De Catalunya
InventorMargarita Calafell Monfort
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Abstract
The present invention relates to a bioprocess for recycling waste paper originated from high quality paper comprising the following steps: a) preparation of pulp; b) dilution with water of the pulped material obtained in a) c) enzymatic treatment of pulp; d) addition of inorganic salts and glues; e) dilution with water of the material obtained in d) f) filtration by vacuum; optional press; and g) drying In particular, said high quality paper is printed paper. The present invention also relates to the obtainable product by the above mentioned process. The present invention further relates to the different uses of the product such as building and construction material, eco-packaging material and eco-decorative material.
Claims10
A process comprising the steps of:
- a) feeding waste paper into a pulper with water to yield a pulp, the waste paper having a consistency between 15 and 20%, wherein the waste paper comprises ashes between 15% and 40% and cellulosic fibers between 60% and 85%;
- b) diluting with recycled water the pulp obtained from step a) until a consistency between 5 and 10% is achieved;
- c) enzymatically treating the diluted pulp obtained from step b);
- d) adding one or more inorganic salts and one or more glues to the enzymatically treated diluted pulp obtained from step c) to determine variability in mechanical properties of a final material of the process, wherein the one or more glues comprise at least one of resin acids, salts thereof, and esters thereof;
- e) diluting with water material obtained from step d) until a consistency between 1 and 3% is achieved;
- f) filtering material obtained from step e) by vacuum and optional press;
- g) drying material obtained from step f);
- wherein there is a feedback of residual water suspension after step f) into containers where steps b) and e) take place;
- and
- wherein any residues resulting from the process are reused in the process itself.
Dependencies are inferred from the claim text.