Paper milling creates products that are seen every day
While people rarely think about paper mill industries; they produce some things we see every day. Such as books, boxes, receipts, tissues and printer paper; which are all produced at the mill from the raw plant fibers.
Many modern mills have switched to using mainly wood fibers (logs). Logs are removed of bark and then chipped. The chips are then processed into pulp. Pulps are produced by two methods. Mechanical pulping involves grinding logs into fibers and retains most of the product allowing its usage for newspapers, magazines etc. Chemical pulping utilizes Chemical processing, heat and removes lignin. Lignin is the naturally occurring substance that binds the individual log fibers together. Stronger and cleaner pulps are created from this process and are utilized for creating writing paper and packaging.
Following pulping, the pulp will go through washing and screening processes to clean dirt and other debris. Depending upon what type of product the mill is producing additives such as dyes, fillers or coating may be added. Also recycled paper is frequently incorporated into the process. Waste reduction, resource conservation, and recycling of post-consumer paper products occur when used paper is deconstructed in water, has the ink removed and is converted back into usable products.
Next, the pulp is diluted with water and then spread onto a continuously traveling wire mesh screen. When excess water leaves the pulp begins to bond forming a thin layer. As excess water continues to leave the pulp it will pass through a series of rollers that further remove excess water and then pass through hot dryers that complete removing all remaining water.
Finally, the paper is smoothed and then rolled or cut into the desired shape. Coating to enhance brilliance or printing capabilities occurs for some types of paper while others are converted into cartons, paper towels or notebook pages.
Modern paper mills continue to focus on increasing their environmental efficiency. Examples include utilizing recycled fiber, cleaner energy sources and sustainable forestry practices to minimize negative impacts.