Waste Paper Utilization and New Fields

The recycling of waste paper not only has good economic benefits, but also has a direct bearing on major issues such as environmental governance and conservation of resources and national economy and people's livelihood. The recovery and utilization of waste paper by some advanced countries in the world has reached a considerable level both in terms of scale and production technology. However, the current recycling of waste paper is still mainly limited to the production of recycled pulp as a raw material for pulp. In order to make more efficient use of waste paper, change waste into treasure, and protect the environment, countries at the same time are exploring new ways to use waste paper, and have made great progress.

First, the manufacture of composite materials

U.S. experts have developed a new process for making composite materials from waste paper by grinding old newspapers with a turbine grinder into powder, then using waste paper, polypropylene, high-density polyethylene resin, ethylene propylene rubber, and 2.6- - Mixing with dibutyl-4-methylphenol, etc., is carried out with stirring and preheated to 75-85°C, and stirred for about 25 minutes at 100 rpm. Friction caused the temperature to rise. When it reached 162°C, the thermoplastic material in the mixture was completely melted. At the same time, the waste paper was further broken up and then softened. Then the agitation speed was reduced and the small particles in the mixture began to coalesce at a temperature of 180°C. At -190°C, the final temperature reached 225°C. The mixture was transferred to a mixer and slowly stirred to granulate the mixture and injected into an open-cell injection molding machine. The composite material produced from waste paper has better thermal stability and fire resistance than ordinary resins. Its mechanical properties are superior to synthetic resin materials mixed with wood flour. It has good molding ability, low shrinkage, and no moisture absorption in the air. Good appearance stability. This composite material is suitable for manufacturing automotive parts.
Japan's Prince Paper Corporation also studied the success of dissolving old newspapers and office waste paper in phenol, a new technology for producing phenolic resins. Because phenol combines with low molecular weight cellulose and hemicellulose, it has higher strength than ordinary resins.

Second, production packaging and building materials

The scientific and technical personnel of the Central Institute of Architecture in India used waste paper, cotton yarn, coconut fiber and asphalt as raw materials to mold a new type of construction material, asphalt corrugated board. The use of this asphalt corrugated board to cover houses provides good insulation, impervious to water, light weight and low cost, and is also characterized by non-flammability and corrosion resistance. A professor in Minnesota, USA, invented a machine that could use waste paper to make bricks.
The former Czechoslovak scientific and technical personnel used five layers of waste paper and synthetic resin under the condition of a temperature of 80°C to press together to form a glued cardboard, and its compressive strength was more than twice as high as that of ordinary plates. Boxes made of this glued cardboard can use nails and screws. And can be installed bearing roller, and its solidity is almost the same as the packaging box made of plywood.
In Singapore and other places, people use old newspapers, old books and other waste paper, roll into round slender sticks, and wrap plastic paper to make home appliances. During production, according to the different shapes of various furniture, different designs can be made in different volumes and colors, so that the manufactured furniture is both practical and beautiful.
The Xinfa Science and Technology Development Center in Luohe City, Henan Province, successfully developed waste pencils instead of wood pencils, which is an innovation in the history of pencil development. It not only saved a lot of wood, but also changed waste into treasure. Paper pencils, beauty pens, and crayons have the characteristics of continuous core, non-living core, non-biased core, ease of writing, fluent writing, and beautiful appearance.

Third, to improve the production of agriculture and animal husbandry

Agriculture and animal husbandry production is mainly to improve the soil quality and processing cattle and sheep feed. Some parts of the pastures in Alabama, USA, have soils that are hard to grow and grass. The State soil expert James Edwards used shredded waste paper and chicken manure in combination with the original soil to modify the soil of pasture based on the characteristics that waste paper will not rot and deteriorate quickly in the soil. Because of the use of basal bacterial bacteria in chicken manure, waste paper can quickly rot and deteriorate, leaving the soil within 3 months of becoming soft and anomalous. Not only suitable for the growth of pasture, but also suitable for the cultivation of a variety of crops such as soybeans, cotton and vegetables, and the production is quite high, at the same time, does not have any side effects on the land. British scientists and technicians used litter paper mixed with arnica cultured mushroom to obtain higher economic benefits.
In recent years, the United States, Britain, and Australia have all developed a process for processing waste paper into feed for cattle and sheep. Larry Berger, an animal nutritionist at Erie University in the United States, chopped the old newspaper, added water and 2% hydrochloric acid, and boiled it for 2 hours. Under the action of high temperature and acid, cellulose broke down and was added into feed to feed cattle. Sheep, add 20-40%. In British cattle farms and sheep farms, waste paper is treated slightly, cut into thin strips or kneaded into small paper masses, and then a small amount of nutrients is added to feed cattle and sheep, and is heavier than ordinary feed-fed cattle and sheep. 1/3. Australian scientists crush the waste paper and incorporate appropriate amounts of linseed oil and bee seals to make pelleted feeds for cattle and sheep, which will enable the cattle and sheep to grow up.

Fourth, the production of methane

Experts from Sweden’s Leonardo University pulped waste paper, added anaerobic microorganisms and aluminum aqueous solutions that decompose organic matter to the slurry, and then moved to the reactor to make cellulose, methanol, and carbohydrates in the waste paper slurry. And so on into methane. The wood extract can then be removed with enzymes to obtain fuel methane. With this method, pulp waste can also be converted to methane recovery.

Fifth, pulp molding

The crushing of old newspapers, pulping with water, and molding have been widely used in the packaging of articles with various types of shock-absorbing requirements, such as the packaging of computer-driven disks and fine equipment. Japanese Canon Inc. and Honshu Paper Co., Ltd. jointly launched a high-strength packaging material that can replace foamed styrene--pulp molded products, which are made into a commodity shape after the pulp is cured, and all the raw materials used are waste paper. A factory in Hunan uses waste pulp for processing into egg trays for the transportation and packaging of eggs. At present, the pulp molding has been more and more widely used in various types of packaging.