Waste paper recycling and promising

Paper is a necessity for human life. With economic and social development, people's production and life can not be separated from paper. Even when it comes to the computer age, paper is still the basic material for communication and recording.

Papermaking was invented by Cai Lun of the Eastern Han Dynasty in China. Until the 19th century, papermaking methods basically remained unchanged. The paper is made from bast fibers such as mulberry and fishnets, rags, and waste hemp. After its introduction into Europe, in the 19th century, it was developed to use wood as raw material for pulping. In 1840, he first produced groundwood pulp. In 1852, he produced caustic soda pulp for the first time, and in 1884 he invented kraft wood pulp. Invented in 1800 with rosin and alum sizing. Chlorine was found in 1774 and subsequently used to bleach the pulp. In 807, the Fourdrinier paper machine was built, and after two years there was a rotary screen machine. In 1875 the paper was coated with a machine. Today, although the paper industry has changed from an ancient handicraft industry to a highly technical one, the basic processes are still: 1) beating in water to thoroughly separate fibers and soak moisture into a suspension of cellulosic fibers. 2) Use a fine mesh filter to remove moisture from the pulp to form a wet sheet on the web. 3) Squeeze and drain most of the moisture from the wet paper sheet. 4) Evaporate the remaining water. 5) According to different uses, the dry paper is further compressed, coated or impregnated.

Wood is the most important raw material for the paper industry. Wood currently used for making pulp accounts for 40% of the annual harvest. Cotton, hemp, and rags, because their fibers are superior to most wood pulps, are still used to make papers with special requirements for strength and durability, such as banknote paper, tracing paper, cigarette paper, and the like. Alkaline liquids (lime and soda or caustic soda) can reduce the demand for fiber raw materials. As a raw material for paper, woodgrass is earlier than wood and is still widely used in the world today, but its production scale is small. Countries that lack forest resources develop papermaking industry, relying mainly on annual plants and crop fiber. Non-wood plants have low pulping yields, and the paper is compact, brittle, and has low tearing and opacity. Non-wood plant pulping is preferably done using alkali. Bagasse can be made into paper. Bamboo can produce satisfactory pulp. Under proper production conditions, the yield of fiber per unit area of ​​bamboo forest may exceed that of any other plant. Linen, hemp, and jute waste have always been good papermaking raw materials. Synthetic fiber papermaking has the advantages of longer fibers, improved paper strength and softness, heat and chemical resistance of the paper, and good dimensional stability. However, the cost is relatively high, which is about several to one to twenty times that of wood pulp.

Waste paper recycling

Papermaking is concentrated in countries with developed industries and rich timber resources. Due to the decreasing number of forest resources in the world, all countries in the world now attach great importance to the recycling of waste paper. The output of Japanese paper and board increased year by year. In 2001, it was 30.717 million tons, which was 1.1 times that of 1990. In the 11 years between 1990 and 2001, the Japanese pulp consumption remained basically unchanged, and the waste paper was Japanese paper industry. The main raw material. In 2001, waste paper accounted for 58% of Japan's raw materials for paper and board production. After several decades of efforts, China’s waste paper recycling has achieved great development, but there is still a big gap compared with Japan. The reason for this is that there are both institutional and cognitive issues. At present, it is imperative to formulate a set of laws and regulations for recycling of waste paper that conforms to China's national conditions and is in line with international standards. This will enable China's paper industry to develop at a high speed and effectively protect resources and the ecological environment.

There are four main types of waste paper: high-quality waste paper, waste corrugated cardboard, waste newsprint, and mixed waste paper. Waste paper recycling system is divided into two categories: deinking recovery and non-deinking recovery. It is necessary to formulate uniform waste paper classification standards through legislation to ensure the smooth implementation of waste paper sorting and recycling. All enterprises, institutions and households should set up a common waste paper sorting and recycling device to classify and collect different types of waste paper so that it can be reused by paper-making enterprises.

Create a website

Established a waste paper recycling website and used computer networks to manage the search for the purchase, sale, and transfer of waste paper, so that the information was accurate and timely, so as to promote the smooth implementation of waste paper recycling.

Computer-aided production can be used in the recycling of waste paper, which can improve the quality of paper products, reduce costs, shorten the production cycle and improve the working conditions of production personnel.

Attract investment

The key to recycling a large amount of waste paper is funding. It needs to attract domestic and foreign investment, especially foreign investment in the development of recycled paper projects.

Encourage innovation

The relevant government departments should encourage innovation and develop new technologies and equipment for the production and production of recycled paper. Enterprises must carry out technological innovations, do a good job of saving raw materials, energy, and alternative use and comprehensive utilization.

For example, a paper mill developed and successfully used the new equipment for the production of recycled paper from waste paper - a fully automatic multi-functional waste pulp processing equipment. It integrates three functions: deflocculating, refining and screening, compact structure, novel and reasonable, good performance, convenient use and maintenance, and obvious energy-saving effect. This waste pulp processing equipment adopts the principle of new pulping technology with slow speed, low specific pressure, long-grinding area, light beating, and centrifugal screening, and integrates multi-functionality into one, which is not only conducive to the improvement of pulp quality but also facilitates the simplification of waste paper. The processing process, saving investment and reducing costs are the ideal equipment for recycling waste paper. With the advancement of science and technology, the entire production of recycled paper technology will inevitably lead to a new leap forward.