This is the most widely used method of waste paper. Making egg trays, industrial trays, firecrackers, etc. can be used not only to make recycled wrapping paper, but also to make recycled newsprint. A French paper company has successfully developed a new newsprint recycling process. This new process includes deinking, paper fiber purification, absorbing ink and impurities, and then making paper. The specific process is as follows: according to the type of ink, choose deinking technology; Sending paper fiber and soap deinking agent into a deinking chamber consisting of two chambers, so that ink and impurities float to the surface with foam and are sucked away by a suction device; Concentrate the purified fiber pulp to 15%, heat it to make the paper fiber expand, and bleach it to make the recycled paper glossy; Finally, the high-concentration pulp is sent to paper-making equipment, which can be made into recycled paper with the same whiteness as new paper.
2 production of phenolic resin
Japan's Prince Paper Company has successfully developed a new technology of dissolving waste paper in phenol to produce phenolic resin. Because phenol is combined with cellulose and hemicellulose with low molecular weight, the strength of phenolic resin is higher than that of products made of phenol and acetaldehyde, and the thermal deformation temperature is 65438 00℃ higher than that of previous phenolic resin.
In production, both old newspapers and office waste paper can be used as raw materials, but the cost of using office waste paper as raw materials is lower, only half of that of using old newspapers.
3 manufacturing household appliances
In Singapore and other places, people use old newspapers, old books and periodicals and other waste paper raw materials, roll them into round slender sticks, wrap them with plastic paper, and manually weave carpets, cushions, bags, cat nests, door curtains, and even household appliances such as coffee tables and beds. When making, you can weave different patterns according to the different shapes of various household appliances, and then decorate them with colors. The household appliances made in this way are both practical and beautiful.
4 press bonded paperboard
At the temperature of 80℃, the former Czechoslovakian scientists made a glued paperboard with five layers of waste paper and synthetic resin, and its compressive strength was more than twice that of ordinary paperboard. The packing box made of this glued cardboard can use nails and screws, and can also be equipped with load-bearing rollers. Its firmness is almost the same as that of plywood packaging boxes.
5 Molded asphalt corrugated board
The scientists and technicians of the Central Institute of Architecture in India used waste paper, cotton yarn ends, coconut fibers and asphalt as raw materials to mold a new building material, namely asphalt corrugated board. Building with this kind of asphalt corrugated board has the characteristics of good heat insulation, good water tightness, easy carrying, low cost, non-flammable and corrosion resistance.
6 methane recovery
Experts from Lundao University in Sweden beat waste paper into pulp, and then added anaerobic microbial aqueous solution which can decompose organic matter into the pulp; Then moved into a reaction furnace, where cellulose, methanol and carbohydrates in the waste paper pulp are converted into methane; Then the wood extract is removed by enzyme, and the fuel methane can be obtained.
7. Improve soil quality
Some pastures in Alabama, USA, in some places, the soil is hardened and nothing grows. James edwards, a soil expert in this state, based on the fact that waste paper will not rot and deteriorate quickly in the soil, mixed waste paper and chicken manure with the original soil to improve the soil quality of the pasture. Its proportion is: paper scraps 40%, chicken manure 10%, and original soil 50%. In this way, waste paper can quickly rot and deteriorate under the action of basic fertilizer bacteria in chicken manure, making the soil soft and abnormal within 3 months, which is not only suitable for producing pasture and making pasture grow vigorously, but also can plant many crops such as soybeans, cotton, vegetables and so on, and the yield is quite high; At the same time, it will not have any side effects on the pasture. If new pieces of paper and chicken manure are added to these lands after two years, the soil will become more fertile and loose.
8 cultivate Pleurotus ostreatus
British scientific and technological personnel cultivated Pleurotus ostreatus with waste paper, and achieved high economic benefits. The specific method is as follows: the waste paper is processed into pieces, soaked in water for 72 hours to remove printed matter and dust, and then the small pieces of paper are scattered; Then, the waste paper and the cut Mayingdan are mixed according to the ratio of 1: 2, and put into a sterilized shallow wooden basin, the basin is generally 50×50× 15cm, and water and excess cellulose are supplied to the basin; After inoculation, cover the wooden basin with plastic film, put it in a culture room at 25℃, and after the mycelium develops for 34 days, remove the covering film and move it to a harvesting room at 20℃. After 20 days of growth, mushrooms can be picked. Generally, it can be harvested continuously for 4 months, and mushrooms can be harvested once per pot 1.5 kg.
Used as padding for livestock fences.
For a long time, people mostly used hay and saws as padding for livestock fences. But in recent years, the United States and western European countries have replaced it with waste paper. Cattle farms, pig farms and chicken farms in Britain have achieved good results after paving the fence with waste paper scraps. In the broiler house, waste paper scraps are spread all the time from brooding to slaughter, and the weight of each chicken can increase by 7.9% on average. For every 1000 broilers, only 192kg waste paper scraps need to be laid. Compared with the traditional bedding, hay and sawdust, waste paper scraps are sanitary, contain no poison such as tannin in sawdust, and have no residue of common chemical pesticides such as rice straw and rice husk, and have no disease source. At the same time, the water vapor content is low, and the heat insulation performance is superior to other materials, which is especially suitable for the growth and development of chicks and newborn babies.
10 processed into cattle and sheep feed.
Countries such as the United States, Britain and Australia have developed good methods to process waste paper into cattle and sheep feed. Larry Berg, an animal nutritionist at Erie University in the United States, chopped old newspapers, added water and 2% hydrochloric acid, and then boiled for 2 hours, so that cellulose was decomposed and broken under the action of high temperature and acid, and then added to the feed of cattle and sheep, with the addition ratio of 20% ~ 40%. Cattle farms and sheep farms in Britain, after a little treatment, cut waste paper into slender strips or knead it into small paper balls, and add a small amount of nutrients to feed cattle and sheep. Cattle and sheep can gain more weight by eating it 1/3 than by eating ordinary feed. Australian scientists crushed waste paper and mixed it with appropriate amount of linseed oil and honey to make granular feed for cattle and sheep, which can make them grow fat.