| There are several differences depending on | | | | same concept as the virgin paper was made. |
| the certain classification of paper that is | | | | |
| being recycled (newspaper, magazines, | | | | Dissolved air flotation: To reuse the |
| fiberboard). Recycling these products | | | | processed water is cleaned once more. |
| involves many processes as listed below. | | | | |
| | | | Waste disposal: The left over pupls and |
| Pulping: Adding water then engaging | | | | material that are no longer needed (sludge), |
| mechanical action to divide fibers from each | | | | is usally placed inside a landfill. Then to |
| other. | | | | create energy, the materials are then burned |
| | | | to use at the mill or local farmers often use |
| Screening: Using a screen-like material, with | | | | the materials as fertilizer for crops. |
| small holes so that the larger contaminants | | | | |
| may be removed. | | | | Standards |
| | | | |
| Centrifugal cleaning: Removing the more dense | | | | Paper is one of the most common recycling |
| materials by spinning the pulp slurry with a | | | | materials on earth. The average amount of |
| cleaner. | | | | recycling for each paper is 4-6 times due to |
| | | | the weakening of the fibers. To provide more |
| Flotation: Letting air bubbles that are | | | | strength the virgin pulp is mixed together |
| passing by to enter the pulp slurry causes | | | | with the paper being recycled. |
| the ink particles to cluster with the surface | | | | |
| foam. With the contaminated foam removed, the | | | | There is not a standard of the maximum |
| pulp is adapted into a brighter material. | | | | percentage that a virgin pulp can be in |
| Sometimes deinking is the term used for this | | | | recycled paper. Most recycled paper has |
| process. | | | | anywhere from 10%-100% used paper in it. Many |
| | | | companies that receive government money, |
| Dispersion or Kneading: A mechanical action | | | | state governments that collect funding; |
| is enforced to breakdown the particles that | | | | therefore, a 50% post-consumer recycled paper |
| may be contaminant. | | | | is the standard for use. The EPA doesn't |
| | | | control recycled paper being used outside of |
| Washing: The water is ran through the pulp to | | | | our government. The only duty they have it |
| removed the smaller particles still within | | | | setting a minimum guideline to go by. There |
| the water. | | | | are three divions of paper the may be |
| | | | purchased for feedstocks, including: pre |
| Bleaching: This is dependent upon the color | | | | post-consumer waste. The trimmings left over |
| of paper needed. For the most common (white), | | | | at a virgin paper mill are described as the |
| hydrosulfites or peroxides are used to | | | | mill broke. The material that was sent for |
| removed the color. | | | | customers to purchase but was not ready are |
| | | | pre-consumer waste, and the material thrown |
| Papermaking: The newly bleached fibers are | | | | away after being used is defined as |
| made into the new paper product using the | | | | post-consumer waste. |