Study on Recycling of Mechanical and Electrical Product Packaging Waste (Part 2)

3.2.1 Significance of Recycling Waste Paper Packaging

The paper raw material resources on the earth are limited. The production of paper not only consumes limited resources and consumes large amounts of energy, but also generates large amounts of waste water and waste. Recycled paper saves energy and reduces environmental pollution. Waste paper recycling has great economic and social significance. Each recovered 1 ton of waste paper, can produce 0.8 tons of recycled paper, can save ca 0.3-0.4 tons of caustic soda, coal-saving 0.4 tons, saving 40 () degrees, equipment investment to reduce 1/3, reduce costs about 50%.

3.2.2 Recycling of paper packaging waste

3.2.2.1 Paper Recycling Waste Recycling

The recycling of waste paper is mainly pulp and paper. The pulping process is: smashing, purifying, screening and concentrating; the papermaking is to convey the waste pulp to the paper machine, pass through the net, press, dry and calender, to make the tube paper or flat paper.

3.2.2.2 Comprehensive Utilization of Paper Packaging Wastes

Paper packaging waste In addition to recycling recycled paper, it is also possible to develop new products. The main products are: Production of Paper-Molded Products Pulp-molded products are produced by vacuum-molding, hydraulic molding, and air-compression modeling of waste paper pulp without debris, and they are rapidly and uniformly deposited on a mesh model, and then compressed and dried. Made. The product is characterized by light weight, low cost, shock resistance, good air permeability, and no pollution to the environment. The production of composite board waste paper can produce high-strength glued cardboard. The method is: Combine waste paper with phenolic resin or aldehydes. Waste paper can also be used to make asphalt corrugated boards. The method is to mold raw materials such as waste paper, cotton yarn, coconut fiber and asphalt. The product has good thermal insulation properties, is impervious to water, lightweight, fireproof and corrosion-resistant, and can be used as housing construction materials.

3.3 Recycling and Comprehensive Utilization of Wood Packaging Waste

3.3.1 Significance of Wood Packaging Waste Recycling

Wood packaging waste refers to wooden containers, wooden barrels and other wooden containers that are discarded immediately after use, as well as wooden pallets, wooden bedding, and fixing materials. Because wood packaging has good loadability, compressive strength, bending strength and impact strength, and strong practicality, some large and medium-sized packaging, especially some sophisticated mechanical and electrical product packaging still widely use wood packaging. In areas where the production of mechanical and electrical products is relatively concentrated, wood packaging accounts for more than 80% of the total packaging volume. With the accelerating pace of China’s economic construction, foreign investment, the introduction of advanced technology and equipment, engineering technology reform, laboratory construction and other projects will surely purchase and introduce a large number of instruments and equipment, and most of the wood packaging that comes with it will be thrown away. The destruction of a large amount of wood packaging waste that can be recycled can waste a limited amount of forest resources and pollute the air, which has an adverse impact on the entire ecological balance and even the sustainable development of the national economy.

3.3.2 Recycling and Comprehensive Utilization of Wood Packaging Wastes

With the development of the national economy, the country’s demand for wood is increasing. In export commodities, as the proportion of mechanical and electrical products increases year by year, the required wood packaging also increases year by year. The current consumption of wood packaging in China accounts for about 9% of the total amount of packaging materials. This figure is much higher than the level of 2% in the United States and Germany and also higher than the level of 5% in Japan. Therefore, the use of wood packaging waste can not be ignored. Using wooden packaging waste, using different production and processing techniques, the chips are mixed with adhesives, and then hot pressed at 120° C. or more. The boards thus manufactured do not have large pests and problems, and can relieve people of wood pests and diseases. Worries. Wood packaging made of artificial boards has a flat, smooth appearance and is easy to print. Some artificial plates have mechanical properties that are no less than the same specifications of the original wood plate, and there is no limitation on the direction of force.

3.4 Recycling of plastic packaging waste

3.4.1 Pollution Status and Hazards of Plastic Packaging Wastes

About 30% of the world's annual plastic output is used for packaging. Most of these packages became solid waste after they were used once. Plastic waste is light, bulky, large in quantity, hard to degrade, and it has become a shocking "white pollution" over time. White pollution is a serious hazard. Most plastic products contain harmful substances such as PVC and acrylonitrile. When they burn, HC1 is produced, which is one of the important causes of acid rain. The acid rain area in China currently accounts for 30% of the country's land area. The use of chlorofluorocarbons (CFCs) and freons in the production of foamed plastics can destroy the ozone layer in the atmosphere and cause excessive ultraviolet radiation, which intensifies the greenhouse effect and destroys the atmospheric balance. Plastic waste not only causes long-term visual pollution, but also emits a variety of toxic chemical gases, such as Diane Ying. The increasing number of non-degradable white garbage, if it does not take measures, will become the largest gas store on the planet.

3.4.2 Recycling of plastic packaging waste

Plastic packaging waste has great harm to the environment and society, and recycling it can be used as a benefit. In general, the following methods can be adopted for recycling: manufacturing of building materials; manufacturing of general merchandise; production of chemical products; manufacture of cracked gas, oil, and monomer; incineration with other garbage, heat recovery (steam, hot gas, and power generation).

Source: China Recycling Resources Network