Rigid Polyvinyl Chloride Corrugated Sheet Making Plant

Abstract

With the advancement of plastics, the desire for ligh t-weigh t and safety of plastic lighting material evolved. Glass fiber reinforced polyester c6rrugated sheet (FRP corrugated sheet) was developed first; then, rigid polyvinyl chloride corrugated sheet was developed as a product in 1956. In the beginning, it was processed by pressing calendered sheet to form corrugation. This was the so called pressed corrugated sheet. Productivity was low and the price was high for that process, so popularization was difficult. The extrusion moulding method of producing R. PVC corrugated sheet, however, was developed during 1957 - 1958, and R. PVC corrugated sheet became the mainstream material for taking in the light through the roof. Since then, because of the low price, it was popularized rapidly, and the domestic annual production i.n 1972 exceeded more than 70,000 tons temporarily. Since 1973, because of the promotion of technology export and the overseas expansion of industry, export of products to Europe declined. Also, the demand of users turned to other material which is pervious to light. Consequently, the annual production dropped to approximately 50,000 tons. This volume, however, has continued steadily and has been settled. In the beginning corrugated sheets were either transparent or semitransparent, but now, besides transparent and semitransparent R. PVC corrugated sheet, there are all sorts of variety such as galvanized iron net reinforced corrugated sheet, glass fiber net reinforced corrugated sheet, and embossed corrugated sheet being sold in the market. Here, therefore, transparent and semitransparent R. PVC corrugated sheets, which are most popular, will be described.