Types of Papers that can be recycled:
- Raw materials
- Old newspapers
- Office cuttings
- Mixed-white cutting
- Old Notebooks
- Phone books
- White computer paper
- Colored office paper
Types of Paper that cannot be recycled:
- Paper towels
- Paper with food waste
- Juice and cereal boxes
- Paper cups
- Coated and treated paper
- Laminated with plastic (paper or magazine)
The first step in the manufacturing process of recycled paper is taking the paper for pulping.
Various types of raw materials are mixed in different proportions to get different qualities of paper.
There are four significant steps in the paper manufacturing process by Sadiq Industries. Sadiq industries is one of the top paper manufacturing companies in Pakistan that distributes printing papers in whole Pakistan.
Raw materials are first slushed inside the pulping machine. After that, it is then adequately churned. Almost 13% of raw materials consists of polythene, ropes, glass, metals etc. which is a significant portion of waste. Small metal pieces like stapler pins or small stones are then removed.
The pulp is mixed with paper, and the massive particles/wastes are allowed to settle.
It again enables massive particles to decide, and freshwater is added.
It drains the liquid pulp to clean the soluble impurities, hence making pulp brighter.
The thickened pulp is then ground and again mixed with water. The pulp is then mixed with water to make it thinner of colouring.
Mixing Colouring Elements:
Manual process (as per requirement)-causing product conformity Issues. The coloured pulp is then transferred through drains.
The liquid paste is then mixed with specific chemicals to maintain the physical and optical property.
The pulp is then collected in the machine chest and then further dilution is done.
2. Paper Machine Section:
Through the headbox, the liquid pulp is poured uniformly in a wired conveyor running at a speed of 300m/min. The water is suctioned through a vacuum, and also, the paste is heated during the process. The pulp then leaves the wired conveyor belt and goes for drying to form paper.
The paper at this stage contains 80% water, and it needs to go through several driers. This size press is set manually to maintain the thickness of the paper.
The paper then goes through 19 drier cylinders.
All these cylinders are kept at a temperature around 65-90C to dry the paper slowly. The paper then passes through “Calendar” which “irons” to remove wrinkles and restore shine. The new paper is then rolled on cylindrical steel rods and sent to the rewinding part.
3. Rewinding Section:
The fresh paper roll is then transferred to the rewinding section. In the rewind section, the paper is cut into various newsprint sizes and rewind in commercial units.
4. Packaging and Dispatch section:
First Cut of paper sheets as per the commercial size and then stacks of Paper Sheets.
Then paper sheets are packaged in commercial units.
Final newsprint rolls ready to be transported. Newsprint rolls being docked on trucks to be sent to newspaper companies. A loaded truck containing newsprint rolls leaves the factory and is distributed to the market.