Typically, high output machines up to 10 feet (3 meters) wide combine reinforcement and resin on plastic film that is pulled through the process. A second plastic film is applied over the reinforcement and resin to allow mixing and exclusion of air that is usually accomplished by compaction rollers.
Cure is completed in an oven. Panels are automatically trimmed to width and cut to length. Corrugated sheet is produced by forming shoes which hold the compacted sheet in the required shape during cure. Special surface effects are created by using embossed carrier films that are later removed. Both mat reinforcements and rovings chopped by special wide cutters are employed in the process.
Polyester and acrylic modified polyesters (for improved water resistance) are the primary resins for continuous lamination.