Which process forms plastic sheets by heating and using a vacuum on a single-surface mould?

Which process forms plastic sheets by heating and using a vacuum on a single-surface mould?

• A. Vacuum forming
• B. Injection moulding
• C. Blow moulding
• D. Compression moulding

Answer: (A)

Vacuum forming is the process in which a heated plastic sheet is drawn into a single-surface mould by applying a vacuum. The sheet is heated until pliable, laid over the mould, and air is removed between the sheet and the mould so the sheet is pulled tightly into the mould’s shape. Because the mould is a single surface, only one side is shaped while the back remains flat, making it a simple and cost-effective method for shallow, large parts such as panels or packaging shells. After forming, the part is trimmed from the excess material. This differs from injection moulding (molten plastic injected into a closed two-part mould), blow moulding (a hollow tube is inflated to form a shape), and compression moulding (material is heated and pressed into a two-sided mould).

Vacuum forming is the process in which a heated plastic sheet is drawn into a single-surface mould by applying a vacuum. The sheet is heated until pliable, laid over the mould, and air is removed between the sheet and the mould so the sheet is pulled tightly into the mould’s shape. Because the mould is a single surface, only one side is shaped while the back remains flat, making it a simple and cost-effective method for shallow, large parts such as panels or packaging shells. After forming, the part is trimmed from the excess material. This differs from injection moulding (molten plastic injected into a closed two-part mould), blow moulding (a hollow tube is inflated to form a shape), and compression moulding (material is heated and pressed into a two-sided mould).