Is there any pollution in the XPS extruded board production process?1. Overview Extruded polystyrene foam (XPS) is a rigid foam with closed-cell structure made of polystyrene resin or its copolymer as the main component, adding a small amount of additives, and extruding by heating. It has excellent and long-lasting heat insulation function, unique resistance to steam penetration, extremely high compressive strength, easy to process and install, so it has been widely used in the world. For example, Dow Chemical’s blue XPS, Owens Corning’s pink XPS, and BASF’s green XPS. In addition to having a large market in their home country, they have achieved success in foreign markets. In the decades after XPS products came out, XPS has been applied in various building structures and has accumulated mature experience. It is widely used as a thermal insulation material in residential buildings, especially roof insulation materials, and there are also many successful examples in business and industry. For example: Osaka Airport in Japan, McDonald's headquarters building in the United States, etc. In my country's new buildings, such as the Bank of China Building in Beijing, Oriental Plaza, the Coca-Cola Factory in Shanghai, and the Nestle Ice Cream Factory in Guangzhou, XPS is used as the insulation material. Second, XPS performance index XPS production process is to melt the polystyrene resin and additives, foaming agent in a specific extruder at a uniform speed, extended by the pressure roller and in the vacuum forming area (some processes do not Need vacuum forming) to cool. It is different from EPS, because it is continuous extrusion molding, so the structure of the product after molding is integrated, rather than expanded by polystyrene particles and pressure molding, XPS has a very complete closed-cell type。
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