Molds are essential tools for glass fiber reinforced pultrusion bridge decks, typically consisting of two parts: the pre-forming mold and the shaping mold.

Pre-formed Molds: In the process of glass fiber reinforced plastic (GFRP) pultrusion bridge girder forming, the reinforcing materials must be impregnated with resin (or impregnated simultaneously) and pass through a pre-formed mold consisting of a set of guiding elements before entering the forming mold. The purpose of the pre-formed mold is to gradually shape the impregnated reinforcing materials into a pre-formed body of the GFRP pultrusion bridge girder that approximates the controlled shape and size of the profile, and then proceed to the forming mold. This ensures the uniform distribution of fiber content in the GFRP pultrusion bridge girder cross-section.

Molding Molds - The cross-sectional area ratio of the molding mold to the glass fiber reinforced plastic (GFRP) pultrusion bridge should generally be greater than or equal to 10 to ensure adequate strength and rigidity, even heat distribution, and stability after heating. The length of the GFRP pultrusion bridge mold is determined by the pulling speed and resin gel curing speed during the molding process to ensure the GFRP pultrusion bridge reaches the demolding and curing stage upon extrusion. Typically, the molds are chrome-plated or heat-treated, and the mold cavity surface must be smooth and wear-resistant to reduce friction resistance during the pultrusion molding process, thereby extending the mold's service life.