The pre-shaped layers of the dry fiber that is similar to its composite part are known as Preform Molds. However, in comparison to other molds, this does not contain any polymer matrix. The mentioned molds are separately produced in the pre-molding operations and are usually placed to the mold before injecting the liquid resin into them.
Benefits of using PET Preform Molds:
Eliminates the need to assemble, cut and fit the fiber network