Paper was first made by Chinese in the 2nd century. It was made by fishnets and tree bark mainly. The earliest paper manufacturing process for making it in bulks, using machinery, can be traced back to 9th century medieval Islamic world.
Paper Manufacturing Process Now.
Paper is made up of fiber. Almost half of the fiber comes from the wood. Other materials are also used in paper manufacturing process like cotton. Linen, hemp fibers, recycled papers, bamboo and fiber from sawmills. Other materials used are chemicals and fillers.
Recycled paper is the most ecofriendly way of making a paper. It not only save trees from being cut down but it is also less energy and water intensive. It also saves paper to be in the dumping ground and producing methane. How amazing is this?
Sadiq paper products pvt limited mainly use this process of paper manufacturing to make their best quality paper. Which is used for writing as well as printing. In this method, used paper goes through many steps to be recycled into a good quality product. Below are the steps used in recycling papers.
- Repulping: old paper mixed with water and chemical in large vats. It is chopped into small pieces and then further broken down by chemicals into cellulose or fiber.
- Screening and cleaning: the fiber goes through screening, to eliminate all foreign objects and contamination
- De-inking: as the name suggests, it removes printed ink and also strips off all adhesives.
- Beating/Refining: After the paper is free of all the adulteration, it is beaten till the fiber swells up.
- Bleaching: coloured paper required bleaching to strip off the dyes and make the paper white and bright. Hydrogen peroxide or oxygen is used for this purpose
- Water mixing: The pulp is mixed with 95.5 percent water. The water is then drained, causing the paper to bond and make paper.
- Drying: This paper is then passed through hot rollers to eliminate all water.
- Rolling/cutting: The dried paper is rolled and then cut into smaller rolls to be transported.
Almost 90% of paper today is made up of wood pulp. Softwood/coniferous trees such as pines and spruces are usually used for this purpose. Although paper can also be made from hardwood trees. There are two ways of paper manufacturing using wood,
- Mechanical pulping: This is a cheaper way and subsequently makes thin quality papers. Fiber is separated from the rest of the raw material using machines. The wood chip is turned into pulp. This pulp still contains most of its lignin resulting in weak paper. This type of paper is mostly used in news prints and phone books.
- Chemical pulping. Wood is first debarked then it goes into the chipper. Those chips are then cooked with chemicals to remove lignin. This reduce the food to fiber. It is then washed, screened and bleached. A variety of chemicals can be used to make the paper coloured or coated to give it strength, texture and to make resistant to water. Then the paper is cut into smaller rolls to be transported to other facilities to make it into specialized papers according to the need. This process makes good Quality papers like the most used A4 and A3 papers.
It is the largest A size paper standardized by ISO 216. This international standard is based upon German DIN 476 standard from the year 1922. A3 size paper measures 29.7 x 42.0 cm or 11.69 x 16.53 inches. In PostScript the dimensions are rounded off to 842 x 1190 points. It weighs 10 grams. If A3 paper is folded in width direction A4 paper is obtained. Two A3 papers in a spread next to each other equals an A2 paper size.
A3 is most common used paper size by industrial professionals. It is commonly used in photo printing, brochures, drawings, diagrams, text printing, posters and large tables.
Sadiq paper is one of the leading paper mills in Pakistan. We are one of the leading paper manufacturers in the Pakistan involved in both traditional and developing markets