Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Roving Doff or "Doff": The final product sold to the customer. It is made by roving or pulling<br />
together a group of forming cakes (the number of which depends upon the product being made).<br />
RP: Reinforced plastic, polymer or polyester.<br />
RRIM: see Reinforced Reaction Injection Molding<br />
RTM: see Resin Transfer Molding<br />
RTM Light: see Vacuum Molding<br />
RTP: Sometimes used to distinguish reinforced thermoplastic from reinforced thermosetting<br />
plastic.<br />
Rule-of-Mixtures: A composite’s properties are the combination of properties in its two<br />
constituent materials. The composite property equals the amount of fiber property multiplied by<br />
the volume percentage of fiber, plus the amount of matrix property multiplied by the volume<br />
percentage of matrix.<br />
Run-Out: The process of pulling glass from doff to the chopper.<br />
Runner: The channel through which thermoplastic material moves through a mold.<br />
SAN: Styrene Acrylonitrile (Thermoplastic Resin).<br />
S Glass: A family of magnesium-alumina-silicate glasses with a certified chemical composition<br />
that conforms to an applicable material specification and produces high mechanical strength.<br />
Sandwich Constructions: Panels composed of a lightweight core material, such as honeycomb<br />
or foamed plastic, to which two relatively thin, dense, high-strength or high-stiffness faces or<br />
skins are adhered.<br />
Scrim: Light woven or non-woven fabric with relatively large openings between the yarns, used<br />
to reinforce paper and other products.<br />
Section Beam: Flanged cylinder onto which yarn is drawn and accumulated from yarn bobbins<br />
or packages.<br />
Serving: Wrapping of yarn around a product in one or more layers to form a protective covering.<br />
Set-Up: To harden, as in curing.<br />
Sewing Thread: Flexible small diameter yarn or strand, usually treated with a surface coating<br />
and/or lubricant, used to stitch one or more pieces of material together or stitch an object to a<br />
material.