Navigácia

Prihlásenie

Zaujímavé odkazy


B


A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z


Bag Molding
A process in which the consolidation of the material in the mold is effected by the application of fluid or gas pressure through a flexible membrane.

Bag Side
The side of the part that is cured against the vacuum bag.

Bagging
Applying an impermeable layer of film over an uncured part and sealing the edges so that a vacuum can be drawn.

Balanced Construction
Equal parts of warp and fill in fiber fabric. Construction in which reactions to tension and compression loads result in extension or compression deformations only and in which flexural loads produce pure bending of equal magnitude in axial and lateral directions.

Balanced Laminate
A composite laminate in which all laminate at angles other than 0o and 90o occur only in + pairs (not necessarily adjacent) and are symmetrical around the centerline.

Bare Glass
The glass as it flows from the bushing in fiber form, before a binder or sizing is applied.

Bias Fabric
A fabric in which warp and fill fibers are at an angle to the length.

Biaxial Winding
A type of filament winding in which the helical band is laid in sequence, side by side, with no crossover of the fibers.

Bi-Directional Laminate
A reinforced laminate in which the fibers are oriented in 2 directions.

Binder
A coating applied to the surface of a chopped glass mat or preform which is then cured. The binder holds the previously sized glass bundles or ends together in the roving operation into a stable shape or form.

Birdnest
A large collection of continuous glass bundles which is tangled up and will not run through the guide eye into roving creel. In the field, a large tangled collection of roving which does not run through the tube or guide eyes to the chopper.

Bisphenol A
A condensation product formed by reaction of two (bis) molecules of phenol with acetone (A). This polyhydric phenol is a standard resin intermediate along with epichlorohydrin in the production of epoxy resins.

Bladder
An elastomeric lining for the containment of pressurization medium in filament-wound structures, or for the manufacture of composite structures

Blade Packing
Glass bundles or chopper fuzz which build up and pack between the blades of a chopper. This blade packing can cause poor choppability. If it falls off, it usually does not wet-through, and this can cause blisters or porosity.

Bleeder Cloth
A nonstructural layer of material used in the manufacture of composite parts to allow the escape of excess gas and resin during cure. The bleeder cloth is removed after the curing process is complete and is not part of the final composite.

Bleedout
The excess liquid resin appearing at the surface primarily occurring during filament winding.

Blister
Undesirable rounded elevation of the surface of a plastic, whose boundaries may be more or less sharply defined, resembling in shape a blister on the human skin. The blister may burst and become flattened.

BMC
Bulk Molding Compound. Thermosetting resin mixed with strand reinforcement, fillers, and so on, into a viscous compound for compression or injection molding. See also sheet molding compound.
See also - Sheet molding compound

Bobbin
The spool or shipping package on to which textile yarns are wound.

Boron Fiber
A fiber usually of a tungsten-filament core with elemental boron vapor deposited on it to impart strength and stiffness.

Braid/Braider
A narrow tubular or flat fabric produced by intertwining a single set of yarns according to a definite pattern.

Break-Up
See Dispersion.
See also - Dispersion

Breather
A loosely woven material, such as glass fabric, which serves as a continuous vacuum path over a part but does not come in contact with the resin. The breather is removed after the curing process is complete and is not part of the final composite.

Bridging
Condition in which fibers do not move into or conform to radii and corners during molding, resulting in voids and dimensional control problems.

Broad Goods
Fiber woven to form fabric up to 1270 mm (50 in.) wide. It may or may not be impregnated with resin and is usually furnished in rolls of 25 to 140 kg. (50 to 300 lb).

Broken End
In the roving operation, a broken or severed strand (bundle) which causes the forming cake to stop running.

B-Stage
An intermediate stage in the reaction of a thermosetting resin in which the material melts when heated and dissolves in certain solvents. Materials are usually precured to this stage to facilitate handling and processing prior to final cure.

Build-Up
Glass bundles or chopper fuzz which collect on the chopper, cot, static bars or machine frame.

Bulk Factor
The ratio of the volume of a raw molding compound, reinforcement or powdered plastic to the volume of the finished solid piece produced therefrom. The ratio of the density of the solid plastic object to the apparent or bulk density of the loose molding powder or fabric.

Bulk Molding Compound (BMC)
Thermosetting resin mixed with strand reinforcement, fillers, and so on, into a viscous compound for compression or injection molding. See also sheet molding compound.
See also - Sheet molding compound

Bundle
A discrete collection of many parallel glass filaments. A collection of Individual filaments, a sub-strand.

Bushing
Plate with holes through which molten glass is pulled to produce glass fibers.

Bushing Tip
Small tapered protrusions on the bottom of bushings each containing an orifice through which molten glass flows, from which continuous filaments are drawn.