Carbon reinforcement fiber derived from the controlled pyrolysis of poly(acrylonitrile) fiber.
A mark on a molded piece where the sections of a mold have met in closing.
Polybuthlene Therephthalate (Thermoplastic Polyester Resin).
Layer of material applied to a prepreg layup surface that is removed from the cured laminate prior to bonding operations and leaves a clean resin-rich surface ready for bonding.
Adhesive bond strength, as in pounds per inch of width, obtained by a stress applied in a peeling mode.
Polyethylene Terephthalate (Thermoplastic Polyester Resin).
A tiny hole in the surface of, or through, a plastic material; usually occurring in multiples.
Small regular or irregular crater in the surface of a plastic, usually with width approximately of the same order of magnitude as its depth.
A Residual Petroleum Product Used In The Manufacture Of Certain Carbon Fibers.
A weaving pattern in which the warp and fill fibers alternate; that is, the repeat pattern is warp/fill/warp/fill, and so on. Both faces of a plain weave are identical. Properties are significantly reduced relative to a weaving pattern with fewer crossovers.
A material that contains as an essential ingredient an organic substance of large molecular weight, is solid in its finished state, and, at some stage in its manufacture or its processing into finished articles, can be shaped by flow; made of plastic.
The mounting plates of a press, to which the entire mold assembly is bolted.
A yarn formed by twisting together two or more single yarns in one operation.(Synonyms folded yarn, formed yarn.)
In general, fabrics or felts consisting of one or more layers (laminates, and so forth). The layers that make up a stack. Yarn resulting from twisting operations (three-ply yarn, and so forth). A single layer of prepreg. A single pass in filament winding (two plies forming one layer).
A product used as a base material in the manufacture of certain carbon fibers.
A polymer in which the structural units are linked by amide or thioamide groupings. Many polyamides are fiber-forming.
A polyester/fiber glass hybrid yarn.
Thermosetting resins, produced by dissolving unsaturated, generally linear, alkyd resins in a vinyl-type active monomer such as styrene, methyl styrene, and diallyl phthalate. Cure is effected through vinyl polymerization using peroxide catalysts and promoters, or heat, to accelerate the reaction. The resins are usually furnished in solution form, but powdered solids are also available.
A very large molecule formed by combining a large number of smaller molecules, called monomers, in a regular pattern.
A chemical reaction in which the molecules of monomers are linked together to form polymers.
The presence of visible voids within a solid material into which either air or liquids can pass.
A mold designed to apply pressure to a piece being molded with no escape of material.
Additional elevated temperature cure, usually without pressure, to improve final properties and/or complete the cure. In certain resins, complete cure and ultimate mechanical properties are attained only by exposure of the cured resin to higher temperatures than those of curing.
The length of time a catalyzed thermosetting resin system retains a viscosity low enough for it to be suitable for processing.
Polyphenylene Oxide (Thermoplastic Resin).
Polyphenylene Sulfide (Thermoplastic Resin).
For carbon fibers, the rayon, PAN, or pitch fibers from which carbon fibers are made.
A preshaped fibrous reinforcement formed by distribution of chopped fibers by air, water flotation, or vacuum over the surface of a perforated screen to the approximate contour and thickness desired in the finished part. Also, a preshaped fibrous reinforcement of mat or cloth formed to desired shape on a mandrel or mock-up prior to being placed in a mold press. Also, a compact "pill" formed by compressing premixed material to facilitate handling and control of uniformity of charges for mold loading.
An unintentional extra layer of cured resin on part of the surface of a reinforced plastic. (Not relating to 'gel coat.')
A molding compound prepared prior to and apart from the molding operations and containing all components required for molding resin, reinforcement, fillers, catalysts, release agents, and other compounds.
Ready-to-mold material in sheet form which may be cloth, mat, or paper pre-impregnated with resin and stored for use. The resin is partially cured to a 'B' stage and supplied to the fabricator who lays up the finished shape and completes the cure with heat and pressure.
A process for molding reinforced plastics in which a tailored, flexible bag is placed over the contact lay-up on the mold, sealed, and clamped in place. Fluid pressure, usually provided by compressed air or water, is placed against the bag, and the part is cured.
A layer of flexible material (usually a high-temperature rubber) used to ensure the application of sufficient pressure to a location, such as a radius, in a lay-up being cured.
A coating applied to a surface, before the application of an adhesive, lacquer, enamel, and so forth, to improve the adhesion performance or load-carrying ability of the bond.
The range of processing conditions, such as stock (melt) temperature, pressure, shear rate, and so on, within which a particular grade of plastic can be fabricated with optimum or acceptable properties by a particular fabricating process.
An automated, continuous process for manufacturing composite rods, tubes and structural shapes having a constant cross section. Roving and other reinforcements are saturated with resin and continuously pulled through a heated die, where the part is formed and cured. The cured part is then cut to length.