An assembly of dry fabric and fibers which has been prepared for one of several different wet resin injection processes A preform may be stitched or stabilized in some other way to hold its shape A commingled preform may contain thermoplastic fibers and may be consolidated by elevated temperature and pressure without resin injection
In plastics, a compressed table or biscuit of plastic composition used for efficiency in handling and accuracy in weighing materials Also an injection molded parison which is blow molded by a second step into a plastic bottle
An early stage in the manufacture of a flaked stone artifact usually with a roughly oval, elliptical or triangular outline Preforms which are roughly shaped, were intended to be finished at a later date into a point or blade In general, the preform was a finished "blank" that lacked only the knapping of the hafting area details for completion of the final implement
A plastic test tube shaped part produced by injection molding systems in the first step of a two-stage injection molding and blow molding process used to produce PET bottles or containers The perform is subsequently re-heated and stretch blown through a blow molding process into the final container shape
Used in the blow molding processes A heat-softened polymer is formed into a shape similar to a thick test tube with neck threads This tube is subsequently inflated while inside a blow mold to create the shape of the desired article