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So far, you all know that pulp is prepared in a pulper. A typical pulper consists of a vat ( large container), a rotor that is fitted inside the vat, one or more pumps with an extraction plate, a junk trap that is attached to the rotor, and a ragger

The raw material mostly consists of wood, used/old papers collected from books, magazines, newspapers, etc., fabrics obtained from clothes, textiles obtained from gunny bags or cloth bags, etc. are fed into the vat with the help of the conveyor belt.

pulp making process machinery

An appropriate amount of water is added to the vat through the pump. The raw material is soaked in the water for a normal amount of time, depending on the quantity. The rotor which is generally present at the bottom center of the vat rotates at high speed. The mixture is stirred well and causes a breakdown of the fibers present in the material with the help of rotor blades. The fibers are also separated from each other at the primary level.

Now, the ragger rope and the junk trap are used to collect the large-sized contaminants from the mixture. Once the contaminants are sent to the junk trap, the remaining pulp is passed through the screening plates (or extraction plates) that removes any unwanted particles or pieces like steel pins, chips, clips, glue, wax, gums, etc. The pulp is exited through the screener and sent for further operations.

The next step in the pulp paper process is washing and cleaning of the obtained pulp. Washing removes impurities, contaminants, and unnecessary particles like raw wood chips, etc. The impurities are also removed by using the screening process for defiberizing. Screening is necessary to remove oversized rejects to form good quality papermaking fibers.

The pulp undergoes the thickening process for the removal of water from the mixture and causes the fibers to bond together. Thickeners remove fillers and fines from the fiber pulp. The unwanted particles are washed out as effluent sludge.

Now, the pulp that is obtained is free from impurities or contaminants. However, this pulp needs to be decolorized as it is made from used papers. The stains and inks need to be removed from the pulp. This is done by the deinking system. It provides brightness to the pulp so that it can be transformed into a new paper.

The bleached is then beaten and refined to improve the formation and bonding of the fibers as they are passed to the papermaking machine.

Finally, the pulp is developed into sheets of required thickness. The pulp can be turned into thin papers, or paper boards, or cardboards, as per manufacturing requirement. The paper undergoes pressing and sheet is rolled onto big rollers. The rollers are cut down into smaller sizes and the paper sheet is trimmed into small-sized papers.

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