The bandwidth refers to the width of material being laid onto the mandrel at any given time. This is made up of one or many rovings being pulled, the total amount of material being laid flat on the mandrel.

Bottle Winds These combine a helical wind section with a geodesic, or near geodesic wind pattern to generate a stable fiber path over the end domes of the part. These are typically used for pressure vessels.
Chain/Transition Winds The user can combine various individual winds described above to form multiple layers of a complex wind. The software will also attempt to generate stable transitions from one layer to the next.
Circuit In filament winding this refers to one pass down and back on a mandrel.
Circumferential Wind A form of filament winding, the angle is approximately 90 degrees also called a hoop wind.
Composite 1) A structure or an entity made up of distinct components. 2) A complex material, such as fiberglass, in which two or more distinct, structurally complementary substances, especially glasses and polymers, combine to produce structural or functional properties not present in any individual component. 3) Reinforced laminates (i.e. canvas phenolic, glass epoxy, etc.)

Composite Designer

McClean Anderson offline software is used to generate motion files.
Cure To change the physical, chemical, or electrical properties of a material by chemical reaction, by the action of heat and catalysts alone or in combination, with or without pressure. Specifically to convert a low molecular weight polymer or resin to an insoluble, infusible state.
Delamination The separation of a laminate along the plane of it's layers. Also the separation of bonded insulation within the adhesive layer or at the adhesive interface.
Extractor Is a machine used to remove a cured composite strucuture from a mandrel. A method of part removal.
Filament Fiber characterized by extreme length, many filaments bundled together are called a roving or tow, the number of rovings determine the bandwidth in filament winding.
Filament Winding Filament winding is an automated open molding process that uses a rotating mandrel as the mold. The male mold configuration produces a finished inner surface and a laminate surface on the outside diameter of the product. Filament winding results in a high degree of fiber loading, which provides high tensile strengths in the manufacture of hollow, generally cylindrical products such as chemical and fuel storage tanks, pipes, stacks, pressure vessels, and rocket motor cases.
Geodesic The shortest distance between two points on a surface. This is the ideal wind path because on a geodesic path there will be no fiber slipping.
Geodesic Solenoid Constant-stress level in any given filament at all points on its path.
Helical Winding Winds which occur at a configurable angle along a cylindrical part. Typically used for winding all manner of pipes and shafts.
Motion Files This is a term used in Composite Designer. The user can directly edit the motion files for each axis. This is primarily used to perform some post-processing of machine motion (e.g. smoothing out high-acceleration regions of the wind). The motion can also be edited to account for irregular shapes in the mandrel (e.g. a protrusion at a fixed location on the mandrel requiring the motion to be adjusted to avoid striking the part).
Non-Linear Winds These are the most complex wind patterns, the user defines an arbitrary mandrel profile and wind angle parameters and the programming software will generate a fiber path which covers the part.


This is the control on the McClean Anderson filament winding machine used to control the winder and actually run the motion file generated by Composite Designer.
Polar Winding This is a term in Composite Designer. A wind in which the filaments pass tangent to the polar opening at one end of the chamber and tangent to the opposite side of the polar opening at the other end. This is very close to a zero degree wind.
Potlife The length of time a catalyzed resin system retains viscosity low enough to be used in processing; also called working life
Prepreg Short for preimpregnated. A combination of mat, fabric, nonwoven material or roving with resin, usually cured to the B-satge, ready for molding. Can be redesignated as standard or net resin prepregs.
Process Prescription Continuous strand roving is fed through a resin bath and wound onto a rotating mandrel. The roving feed runs on a trolley that traverses the length of the mandrel. The filament is laid down in a predetermined geometric pattern to provide maximum strength in the directions required. When sufficient layers have been applied, the laminate is cured on the mandrel. The molded part is then stripped from the mandrel. Equipment is available for filament winding on a continuous basis and two axis winding for pressure cylinders. Filament winding can be combined with the chopping process and is known as the hoop chop process.
Roving A collection of bundles of continuous filaments either as untwisted strands or twisted yarns. Rovings may be lightly twisted, but for filament winding they are generally wound as bands or tapes with as little twist as possible.
S-2 Glass S-glass and S-2 glass fibers have the same glass composition but different finishes (coatings). S-glass is made to more demanding specifications, and S-2 glass is considered the commercial grade
S-Glass A magnesia-alumina-silicate glass especially designed to provide filaments with very high tensile strength.
SimWind McClean Anderson's next generation fiber pattern development software, designing and modeling complex filament wound structures. SimWind offers different wind patterns, which cater to most sizes, shapes of the mandrels and materials used for winding.
TEX TEX is a metric term used to classify glass, it refers to grams per 1000m of material.
Towpreg A prepreg fabricated from tow which can be converted to woven and braided fabric. These fabric structures are more flexible than the prepreg tape and can be used for three-dimensional lay-ups. 
Yield Yield is a term used to classify glass, it refers to nominal yards of material per pound.
Zero-Degree Winds These are specialty winds for generating zero-angle winds which run the length of cylinders (generally combined with the use of specialized mandrels to catch the fiber at the ends of the part and prevent slippage).