Polystyrene foam is a cushioning material that used frequently, and the polystyrene resin is the main structure, adding foaming agent and other additives to make. The foam board can also made from raw material for XPS. China's polystyrene foam factories mainly concentrated in the northeast, Jiangsu, Zhejiang and Beijing, Tianjin, Hebei.
At present, China's EPS production enterprises is about 2000, polystyrene foam production has a good momentum, and the quality continues to increase. But the number of large enterprises is less. It is reported that the apparent density refers to the per unit volume of foam in the specified temperature and relative humidity conditions. The apparent density affects the physical performance in a certain extent and directly reflects the cost of the product.
China's thermal insulation materials market has started late, especially organic materials, and the thermal insulation materials market development is lagging behind. Over the past decade, the state actively promote the development of energy-saving buildings, reduce energy consumption, making the expansion of polystyrene board thin plaster external wall insulation technology which has been widely used，also led to the rapid development of EPS production enterprises.
When the density of polystyrene foam sheet is insufficient, if it is used for exterior insulation, it will lead to its low tensile strength, and can not meet the insulation system and the surface load of its shear strength of the bearing capacity requirements, which may easy to make the middle of the EPS board was broken; at the same time EPS board density will also lead to lower insulation performance, increased hygiene, affecting the building insulation effect, polystyrene foam board will not achieve the role of building energy conservation insulation.
However, the polystyrene are disposable, which can easily become the white pollution, so recycling through foam recycling machine is very necessary to protect our environment. And then we can reuse it to do some other products.