In Chinese mainland, people are no strangers to recycled paper. It is a kind of paper that is reproduced from recycled waste paper after proper treatment. As early as more than 1000 years ago, there was a so-called "resurrection paper" in China Song Dynasty. In today's words, rejuvenation paper is recycled paper. Song Yingxing, a scientist in the Ming Dynasty, wrote in his book Heavenly Creations: "Waste paper can be made into paper without too much consumption ... it is called rejuvenation paper. 」
Using waste paper to make paper has many advantages. It is estimated that every ton of waste paper is used to make paper, which can save about 500 kilograms of fiber raw materials; Caustic soda 150kg, saving electricity by 360 degrees; Save 350 kilograms of coal; Reduce water consumption 120 tons or more. In addition, it is particularly important to make full use of resources, protect the ecological environment and bring benefits to paper enterprises. Therefore, waste paper has become one of the sources of raw materials in the paper industry, and has been paid more and more attention.
The fibers of waste paper are not wasted. The fibers of paper itself, printing or writing paper, are just some carbon black (or other pigments) particles and adhesive particles attached to the surface of paper fibers. If you try to wash off these particles, it's like washing dirty clothes. Then, the obtained clean fiber can still be used to make paper again, thus achieving the purpose of renovation. Because there are many kinds of plant fibers used for papermaking, such as conifer (cork) fiber, hardwood fiber, bamboo fiber, wheat straw fiber, bagasse fiber, reed fiber, cotton fiber, bark fiber, hemp fiber and so on. In addition, in the process of papermaking, they are subjected to certain chemical (cooking, bleaching) and mechanical (beating) effects, so we can't mistakenly think that waste paper fibers can be recycled indefinitely.
According to the analysis and research of papermaking experts, generally speaking, coniferous fibers can be reused more than five times (the strength decreases greatly after eight times). Broadleaf fiber (short fiber) is cubic; Grass fiber can only be reused twice. Cotton fiber and bast fiber can be reused for more than 10 times, but they are not used much in papermaking. On the one hand, the fiber in waste paper can't be regarded as waste, but should be a treasure. On the other hand, how to make better use of it needs further study. After several years of publicity and practice, everyone's understanding of waste paper environmental protection paper (recycled paper) has been greatly improved. However, the recovery rate and utilization rate of waste paper vary greatly among countries and regions. The so-called waste paper recovery rate refers to the percentage of waste paper recovered and wasted paper in a certain region and period. Therefore, the recovery rate of waste paper depends on consumption and is only indirectly related to production. The utilization rate of waste paper refers to the proportion of waste paper that has been purchased and reused for production.
In Tokyo, Japan, the benefits of recycling waste paper are vigorously promoted. Through television, radio, newspapers and other media, residents are invited to watch movies for free (all around the application of paper and the recycling of waste paper), and employees and primary and secondary school students of papermaking, printing, packaging and publishing companies are mobilized to buy waste paper and repackage garbage. Send three-wheeled motorcycles to transport waste paper and implement collective recycling. Osaka, Japan has also come up with a clever way, that is, when recycling waste paper, in addition to paying cash, every time you recycle 10 kg, you will get a lottery ticket, and if you win the lottery ticket, you will get a generous reward. This method has also received good results.