What process involves heating a thermoplastic sheet and forming it against a mold?

The process that involves heating a thermoplastic sheet and forming it against a mold is known as Vacuum Forming. In this method, a thermoplastic sheet is first heated until it becomes pliable. It is then placed over a mold, and a vacuum is applied between the sheet and the mold. This creates a pressure differential, causing the sheet to be drawn tightly against the contours of the mold.

Vacuum Forming is commonly used for creating lightweight, detailed shapes and is often utilized to manufacture packaging, trays, and other components in various industries, making it a versatile and efficient method for working with thermoplastics.

In contrast, Injection Molding involves injecting molten plastic into a mold, which is different from the sheet forming approach of Vacuum Forming. Blow Molding is primarily used for creating hollow plastic parts and often involves air pressure rather than the vacuum technique. Compression Molding is a method where preheated material is placed in a mold and then compressed to form a shape, which differs from the heating and forming process characteristic of Vacuum Forming.