RECYCLINGOF PAPER
- 1. SUBMITTED by :- MOHIT RAM B.TECH FINAL YEAR 2K14 BATCH
- 2. CONTENTS • INTRODUCTION • WHAT PAPER IS RECYCLED? • RECYCLED PAPER SOURCES • RECYCLED PAPER PROCESSING • ENVIRONMENTAL IMPACTS • BENEFITS OF RECYCLING PAPER • USES • REFERENCES
- 3. INTRODUCTION • Paper recycling is the process of turning waste paper into new paper products. • There are three categories of paper that can be used as feedstock for making recycled paper: mill broke, pre-consumer waste and postconsumer waste.
- 5. What paper is recycled ??
- 6. Recycled Paper Sources • Households - Newspaper - Mixed waste • Retail and wholesale - corrugated containers • Offices, Institutions, Printers and converters - High grade deinking
- 9. Contaminant Removal • Metals • Chemicals • Thread • Plastic • Paper clips, Staples • Metal binders • Ink • Adhesives • Wax • Clay • solvent
- 10. PULPING A device whose main objective is to convert recovered paper into a slurry of well separated fibres and other waste paper
- 12. CLEANING • Remove impurities from the pulp • Centrifugal cleaners remove - metal - Inks - Sand - Bark - dirt
- 14. Contaminant Removal • Metals • Chemicals • Thread • Plastic • Paper clips, Staples • Metal binders • Ink • Adhesives • Wax • Clay • solvent
- 15. DEINKING In the deinking stage, the goal is to release and remove the hydrophobic contaminants from the recycled paper. The contaminants are mostly printing ink and stickies . Several processes are used, most commonly flotation or washing.
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- 17. Chemicals Used in Deinking • Sodium hydroxide • Soap • Calcium salts • Surfactants • Hydrogen peroxide • Talc • Sulfuric acid • Solvents
- 18. Refining, Bleaching and Color Stripping • During refining, the pulp is beaten to make the recycle fibers swell, making them ideal for papermaking. If the pulp contains any large bundles of fibers, refining separates them into individual fibers. If the recovered paper is colored, color stripping chemicals remove the dyes from the paper.
- 20. Environmental Impact • Effluent Processing • Sludge • Contaminant disposal • Refining, Bleaching and color Stripping
- 21. Benefits of Recycling Paper • Recycling newspaper saves 14% of landfill space • Recycling one ton of paper can save 17 trees • Reduces sulfur dioxide emissions • Most paper can be recycled up to 8 times to • create new products • Leaves more trees for the sustainability of our environment • Saves energy
- 22. REFRENCES • https://www.researchgate.net/publication/44 415608_Technology_of_paper_recycling_edit ed_by_R W_J_McKinney • https://en.wikipedia.org/wiki/Paper_recycling • "Kirk‐Othmer, “Kirk-Othmer encyclopedia of chemical technology”by Schubert, EF, Gessmann, T. and Kim, 5th ed,vol.21, John Wiley & Sons, New York (1979)