Polyurethane sandwich panel wells, also known as PUF panels, were invented as a natural evolution of polyurethane foam insulation and sandwich panel technology.

Sandwich panels are made by bonding two thin sheets of material, called facings, to a thick core material, usually made of foam, to create a composite panel. The facings provide strength and stability, while the core material provides insulation and rigidity.

In the case of polyurethane sandwich panels, the facings are typically made of steel or aluminum, while the core material is made of polyurethane foam. The panels are manufactured by injecting liquid polyurethane foam between the facings, which then expands and hardens to form a solid core.

The invention of polyurethane sandwich panels is attributed to the early 1960s when manufacturers began experimenting with new materials and processes to improve the performance of sandwich panels. The combination of the high insulation value of polyurethane foam and the strength and durability of steel or aluminum facings proved to be an ideal solution for the construction industry.

The use of polyurethane sandwich panel wells quickly gained popularity in the construction industry due to their excellent insulation properties, lightweight, and easy installation. Today, they are widely used in a variety of applications, including industrial buildings, cold storages, commercial buildings, and residential buildings.