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
the compressed cylinder of PTFE resin that is used to extrude into raw tubing Also called a billet
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
Compact mass of premixed plastic material that has been prepared for convenient handling and control of uniformity during the mold loading process
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
A object that has undergone preliminary shaping but is not yet in its final form
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