Large-scale closed recycling plant has its undisputed advanced, but the cost of recycling is very high, and only suitable for a large number of waste polystyrene, especially a large number of waste polystyrene foam places. In terms of general waste polystyrene foam, it is difficult to concentrate in large quantities, so the investment in the construction of large-scale recycling plant or workshop method in China currently has some difficulties, but some small and simple recycling equipment is more suitable for the situation in China.

　　Comparison of various equipment at home and abroad to recover polystyrene resin, inevitably, its performance is lower than the new resin. Because after a fixed recovery temperature, the molecular chain will always be some chain breakage, degradation, some additives will also be affected by the higher temperature and degradation or volatilization, so that the performance of recycled resin degradation. The recycled material always inevitably contains impurities that cannot be removed, so the recycled material can only be infiltrated into the new material in a small amount, and if the recycled material is used completely, only low-grade products can be produced. In addition, from a hygienic point of view, it can only be used for the production of non-food contact type products. In response to the shortcomings of recycled materials, especially the problem of brittleness, some manufacturers usually add some additives to improve the performance of this area. For plastics processing plants, this method is relatively easy to do, without adding any equipment, and the cost is not too high, but this method for improving the performance of recycled materials is limited. If you want to improve the use of polystyrene recycling material, it can be modified with other tough polymer materials blended, but this method is technically difficult, not a plastic products companies can do. If the special plant and equipment for this work, will undoubtedly lead to higher costs, the current situation in the country, does not yet have the conditions.

　　For the general plastics processing enterprises, usually the plant generated by the waste plastic decontamination, crushing, melting, extrusion granulation, and then a small amount of new material mixed with the use of this is the simplest recycling method. It has the advantage of low cost, basically do not need to buy additional equipment. If the recovery of polystyrene foam blocks from the community, you can also use this method, but first to remove or clean the dirty part. For polystyrene foam containers used as eating utensils, they can be cleaned and recycled in the above way. But in fact, to completely clean is very difficult, more or less will contain a certain amount of oil, food and juice, affecting the performance of the recycled resin, this case is best to thermally decompose the recovery of styrene or oil. Waste polystyrene foam pyrolysis recovery of styrene, there is a common problem of styrene yield is not high, in recent years, through research found that the appropriate addition of certain metal catalysts can improve the styrene yield. The product of pyrolysis can be obtained by distillation and other processes to obtain a very high purity of styrene, and the last remaining residue can be used as a waterproof material for buildings. It can be almost completely used. Recovery of styrene also requires special recovery equipment, mainly cracking reaction equipment. If the equipment is set up specifically for recycling, the amount of recyclable waste polystyrene foam must be large, otherwise it is very costly and uneconomical. If you can use the old equipment in chemical plants to transform, it can greatly reduce the investment in equipment domestic development of catalytic cracking recovery of styrene technology units, some have achieved better results, not only high yield, and styrene content of more than 99%, the investment in equipment is also more cost-effective.

　　The use of waste polystyrene foam with solvent melting made of a variety of protective paint and adhesive method, a relatively simple process, the cost is relatively low, it is more suitable for China's polystyrene foam use scattered, scattered waste situation, can be tailored to local recycling treatment.

　　With the development of China's raw material industry, the product industry will also have greater development, and at the same time, the waste of plastic will also increase, which will cause more harm to the environment, so the recycling work must be followed by faster progress. With the economic development of polystyrene foam use and demand will be more and more, the waste of polystyrene foam will also grow, such as not doing a good job in the recycling of waste polystyrene foam, not only is the pollution of the environment, waste of resources, will also cause social opinion and affect the development of the plastics industry.

　　Many countries and regions in the world today have banned the use of plastic products in some areas to reduce the harm caused by plastic waste to the environment, Italy was the first to make provisions in this regard, the country in 1991 announced a complete ban on the use of plastic bags. Germany and Switzerland, although not completely banned, but also in the gradual reduction of the amount of plastic in the packaging, the original plastic packaging in the United States has been 1/2 to a new paper packaging, Japan in order to avoid the growth of the amount of plastic, has been in many aspects of the ban or reduce the use of plastic packaging, and the existing polystyrene beverage cups and boxes of products are only allowed to reduce production and not allowed to expand and increase production capacity. Countries currently take the ban on plastic packaging, are due to poor recycling of waste plastics and environmental pollution caused by the use of measures. In the early years, the development and application of plastics have won the praise of countries and parties, and human beings have enjoyed the many conveniences brought by the development of plastics, but in recent years, when plastic waste recycling has not yet kept up, it has been criticized by all sides of public opinion, and seems to have become the culprit of the destruction of the human environment.

　　In the past few years, the production of plastic waste in industrially developed countries is very alarming, in 1900, the amount of plastic waste in North America reached 118NM, accounting for 49% of the plastic production in that year, while the amount of plastic waste in Europe reached 13.6Mt, accounting for 46% of the plastic production in that year. This shows that the amount of plastic waste is very large. In order to reduce plastic waste and promote the recycling of waste plastics, developed countries such as Europe and the United States have formulated regulations and policies for the recycling and application of recycled plastics, and these regulations and policies specify the recycling rate of waste materials and the processing methods used to complete these regulations.

　　After the reform and opening up, China's plastic industry economy has developed rapidly, 195 years of national plastic production has reached 6.2Mt, but about 30% of the plastic used for packaging, about 1.8Mt. Among them, the use cycle of very short film, bags, rope, bottles, boxes, cups, etc. accounted for more than 50% of plastic packaging. These products will soon be discarded, and the waste plastic has caused considerable harm to the environment over time. The good thing is that there are many knowledgeable people and units around the country have conducted research on the recycling of waste plastics, and some have achieved successful experience, for example, waste polystyrene foam can now be fully recycled and reused. At present, there are still difficulties is the recovery of polystyrene extrusion foam fast food lunch boxes, mainly because of the used fast food boxes with food and juice adhering to them, it is difficult to remove: if directly recycled, these dirt will obviously enter the recycled material, so that the recycled material can not be used. We may wish to draw on the cleaning methods of other substances, first broken or cut into small pieces of 20mm square (piece), and then cleaned with detergent and water well dry, by cleaning the waste to remove the dirt, and then other recycling processes to recover is entirely feasible. Washing of waste plastics is not difficult at present, borrowing conventional washing machinery or simple washing machine can be; washing available ordinary detergent, but also available special detergent.

　　From the above methods, the recovery of polystyrene foam is not difficult, it should be said that the existing methods and equipment are fully available for recycling, but there are still many waste polystyrene foam can not be fully recycled. For example, large pieces of polystyrene foam are easy to recycle, but scattered ones are not easy to recycle; polystyrene foam discarded inside the factory is easy to recycle, but fast food boxes scattered along the railroad are not easy to recycle. In order to protect the environment and adequately recycle waste polystyrene foam, the country can develop some regulations to limit the use of polystyrene foam in certain areas to reduce the amount of waste gas, and can also develop recycling regulations. In addition to the recycling of waste polystyrene plastic, the state should be encouraged and supported, and give enterprises some preferential policies to mobilize the enthusiasm of enterprises.