30/08/2017
Paper and Cardboard Recycling Processes
According to industry estimates, paper can be recycled an average of 4 to 6 times. Each time recycling occurs, the fibers become shorter and weaker and virgin pulp must be introduced into paper production to maintain the strength and quality of the fiber. Through this process, recovered paper and forest-based product complement each other ecologically and economically.
The recycling of paper follows a series of steps which may vary depending on the type of paper and its degree of deterioration.
Sorting: Paper products must be separated according to their composition and degree of deterioration. Different types of paper can sometimes be mixed. Others, such as paperboard, are recycled using a single-grade process, meaning that no other type of paper can be mixed in during its processing.
Baling: Large quantities of paper are packed using hydraulic machines that apply enormous pressure to compact recovered paper into blocks that are easier and more cost-effective to transport.
Shredding: Recovered fiber is shredded into smaller pieces and mixed with water to make pulp
Washing: The pulp is washed, refined and cleaned, then turned into a slush that undergoes filtering through screens and other separation processes to remove contaminants such as ink, clay, dirt, plastic and metals. Dyes, coatings and other additives can be introduced during this process. Water is continuously drained and cleaned for reuse.
Bleaching: In order to whiten paper, the pulp can be bleached using hydrogen peroxide and chlorine.
Pressing: The resulting paper sheet, known as βwebβ, is pressed between massive rollers to extract as much of the remaining water as possible and to ensure uniform smoothness and thickness. The semi-dry web is then run through heated dryer rollers to remove any remaining water.
Rolling: The finished paper is processed into large rolls ready to be manufactured again into new consumer products.
Happy recycling!!! π