Manufacturing Process Of Paper

Manufacturing Process of Paper MME 6704 Course Tutor: Dr Hossain Mohammad Mamun Al Rashed Presented By: Md. Mehedi Hassan Student ID:0419112507 Department : Material Science & Engineering Bangladesh University of Engineering and Technology

How is Paper Made? Paper is very important and essential element in our modern life.

Two steps for Paper Production 1.Cellulose fibers are extracted from a variety of sources and converted to pulp. 2.Pulp is combined with water and placed on a paper making machine where it is flattened, dried, and cut into sheets and rolls. Raw material for Paper 1.Cotton & Other Natural Fibers. 2. Recycled Fibers Natural fibire come from trees like Spruce, Pine, Fir, Larch, Hemlock, Eucalyptus, Aspen, Birch. Recycled Fibers come from paper manufacturing and printing processes, recycled papers (like newspaper)

How is Paper Pulp Made? Three main components, which must all be separated from forestry products to make pulp. 1.Bark 2.Fiber 3.Lignin Two kinds of Paper Pulp 1.Mechanical Pulp  In thIs process a giant machine containing a rotating disk are used to ground up a log. Heat and chemicals are used to aid in this process and both whole and partial fibers are created. 2. Chemical Pupl In this process logs are cut into small chunks of wood that are about 1/2" to 1" long, and 1/4" to 1/2" thick. The wood chips are combine with hot water and chemicals through a giant machine. This helps remove air pockets from the log. Finally wood chipps around 360 degrees farenheit which leaves wood fibers, and a liquid called "black liquor."

Paper Making Machine Generally A Paper machines are comprised of 4 primary sections. These are: 1.Wet End Wet 2.Press Section 3.Dryer Section 4.Calender Section Wet End In this section Pulp is mixed with water as well as additional fillers and additives and then pumped onto a belt.This section ensure the paper grain goes in the right direction. Wet Press Section In this section the pulp moves off of the mesh belt onto a felt belt. Also moisture separation is done here by its own drying station.

Paper Making Machine Dryer Section Dryer Section makes the pulp into paper shape and weaves the web of paper through a series of heated rollers. Calender Section This section provide pressure on paper through a rollers and make the paper smooth. More roller present make the paper more smooth. Finally paper comes and some material have been added to make this paper more attractive and qualitative.

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