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Glossary



Laminate

A product made by bonding together two or more layers of material or materials. Primarily means a composite material system made with layers of fibre reinforcement in a resin. Sometimes used as a general reference for composites, regardless of how made. Examples of usage laminate consumption by market, compression-moulded laminate.


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.


Laminate Ply

One layer of a laminated product.


Land

The portion of a mould which provides the separation or cutoff of the flash from the moulded 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 mould, the horizontal bearing surface; in a two-piece mould, a platform build up to the split line.


Lay-Up

The reinforcing material placed in position in the mould. The process of placing the reinforcing material in position in the mould. The resin-impregnated reinforcement. A description of the component materials, geometry, and so forth, of a laminate.


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 mould before roll-out).


Loom

A mechanical device that interlaces fibres at right angles with varying degrees of weave construction (weight, thickness and design). More modern looms are air jet but rapier and more traditional shuttle equipment is still in use.


Low Profile

Resin compounds formulated for low or zero shrinkage during moulding.


Low-Pressure Moulding

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.

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