Vinyl tarpaulin, also known as PVC tarpaulin, is a type of tarpaulin made from polyvinyl chloride (PVC) material. The process of making vinyl tarpaulin involves several steps, which are outlined below:
- Mixing and melting: The first step in making vinyl tarpaulin is to mix PVC resin with other additives, such as plasticizers, stabilizers, and pigments. This mixture is then melted at high temperatures to form a molten PVC compound.
- Extrusion: The molten PVC compound is then extruded through a die, which is a tool that shapes the material into a flat, continuous sheet. This sheet is cooled by passing it through a series of rollers, which also help to smooth and flatten the material.
- Coating: The cooled PVC sheet is then coated with a layer of liquid PVC using a process called knife-over-roll coating. This process involves passing the sheet over a rotating knife blade that applies a layer of liquid PVC to the surface of the sheet.
- Calendering: The coated PVC sheet is then passed through a series of calendering rollers, which apply pressure and heat to the material to create a smooth and even surface. This process also helps to improve the strength and durability of the material.
- Cutting and finishing: Once the vinyl tarpaulin is formed, it can be cut to the desired size and shape using a cutting machine. The edges of the tarpaulin are then hemmed and reinforced with grommets or other fasteners to provide additional strength and durability.
In conclusion, vinyl tarpaulin is made by mixing and melting PVC resin with additives, extruding the material into a sheet, coating it with liquid PVC, calendering it to improve its strength and durability, and then cutting and finishing it to the desired size and shape. The resulting material is a strong, durable, and versatile solution for a wide range of applications.