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Fiberset Incorporated's Glossary of Composite Terms
Thank you for visiting our glossary of terms. Feel free to link your site to this page as well as email us with any new terms you feel may be important to include. Clicking on the |
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Fiberset Incorporated's Glossary of Composite Terms
Thank you for visiting our glossary of terms. Feel free to link your site to this page as well as email us with any new terms you feel may be important to include. Clicking on the |
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JACKSTRAWING
Prominence of fiberglass pattern having turned white in the laminant because the glass has separated from the resin due to excessive exothermic heat usually associated with thick, resin rich laminants.
JIG
Any fixture for holding parts in position, while joining them together or to maintain their shape.
JOINT
A line or distinction formed when two panels are connected. Also referred to as a seam.
KEVLAR
Trademark of DuPont for aramid fibers used as a reinforcement fiber.
KNITTING
A method of constructing fabric by interlocking series of loops of one or more yarns.
LAMINA
A single ply or layer in a laminate made up of a series of layers.
LAMINAE
Plural of lamina
LAMINATE
The process.
LAMINATE (noun)
Layers of a composite consisting of a resin and a reinforcement, bonded together to form a single structure.
LAMINATE (verb)
The act of processing resin and reinforcement into a bonded structure. Saturating glass reinforcement and rolling out air voids is to laminate.
LAMINATE
To unite sheets of material by a bonding material usually with pressure and heat (normally used with reference to flat sheets); a product made by so bonding.
LAMINANT
The product.
LAMINATE ORIENTATION
The configuration of a cross-plied composite laminate with regard to the angles of cross-plying, the number of laminae at each angle, and the exact sequence of the lamina lay-up.
LAMINATED PLASTICS
Material consisting of superimposed layers of a synthetic resin-impregnated or coated filler that has been bonded together usually by means of heat and pressure, to form a single piece.
LAMINATE PLY
One layer of a laminated product.
LAND
The portion of a mold which provides the separation or cutoff of the flash from the molded article; in the screw of an extruder, the bearing surface along the top of the flights; in an extrusion die, the surface parallel to the flow of material; in a semi-positive or flash mold, the horizontal bearing surface; in a two-piece mold, a platform build up to the split line.
LAP JOINT
A joint made by bonding overlapped portions of two adherents.
LAY
In glass fiber, the spacing of the roving bands on the roving package expressed in the number of bands per inch; in filament winding, the orientation of the ribbon with some reference, usually the axis of rotation.
LAY-UP
As used in reinforced plastics, the reinforcing material place in position in the mold; the process of placing the reinforcing material in position in the mold; the resin-impregnated reinforcement; a description of the component materials, geometry, etc. of a laminate.
LAYER
A single ply of lay up or laminate.
LENGTHWISE DIRECTION
Refers to the cutting of specimens and to the application of loads. For rods and tubes, lengthwise is the direction of the long axis. For the other shapes of materials that are stronger in one direction than in the other, lengthwise is the direction that is stronger. For materials that are equally strong in both directions, lengthwise is an arbitrarily designated direction that may be with the grain, direction of flow in manufacture, longer direction, etc.
LIQUID-CRYSTAL POLYMERS
A newer type of thermoplastic, melt processible, with high orientation in molding, improved tensile strength, and high-temperature capability.
LOAD-DEFLECTION CURVE
A curve in which the increasing flexural loads are plotted on the ordinate axis and the deflections caused by those loads are plotted on the abcissae axis.
LOFT
The height of the glass lay-down either dry (as in chopping SMC glass) or wet (as in the height of the glass/resin mixture in a spray-up on the mold before roll-out).
LOSS ON IGNITION
Weight loss, usually expressed as percent of total, after burning off an organic sizing from glass fibers, or an organic resin from a glass fiber laminate.
LOW PROFILE
Low shrink resins, which reduce surface distortion.
LOW-PRESSURE LAMINANTS
In general, laminates molded and cured in the range of pressures from 400 psi down to an including pressure obtained by the mere contact of the plies.
LOW-PRESSURE MOLDING
The distribution of relatively uniform low pressure (200 psi or less) over a resin-bearing fibrous assembly of cellulose, glass, asbestos, or other material, with or without application of heat from external source, to form a structure possessing definite physical properties.
L/D RATIO
A term used to define an extrusion screw, which denotes the ratio of the screw length to the screw diameter.
Glossary Section (J,K,L) Last Updated: