Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Reinforced Plastics: It is molded, formed, filament-wound, tape-wrapped or shaped plastic parts<br />
consisting of resins to which reinforcing fibers, mats and fabrics have been added before the<br />
forming operation to provide strength properties greatly superior to those of the base resin.<br />
Reinforced Reaction Injection Molding (RRIM): A reaction injection molding with<br />
reinforcement added. see Reaction Injection Molding<br />
Reinforcement: Strong material bonded into a matrix to improve its mechanical properties.<br />
Reinforcements are usually long fibers, chopped fibers, whiskers and particulates. The term<br />
should not be used synonymously with filler.<br />
Release Agent: Compound used to reduce surface tension or adhesion between a mold and a<br />
part.<br />
Resin: Solid or pseudo-solid organic material, usually of high molecular weight, that tends to<br />
flow when subjected to stress. Most resins are polymers. In reinforced plastics, the material used<br />
to bind together the reinforcement material. See Matrix and Polymer<br />
Resin Content: The amount of resin in a laminate, expressed either as a percent of total weight<br />
or total volume.<br />
Resin-Rich Area: Localized area filled with resin and lacking reinforcing material.<br />
Resin-Starved Area: Localized area of insufficient resin, usually identified by low gloss, dry<br />
spots or fiber showing on the surface.<br />
Resin Tearing: Separation of pigments in a gel coat affecting cosmetic appearance.<br />
Resin Transfer Molding (RTM): A process in which catalyzed resin is transferred or injected<br />
into an enclosed mold where fiberglass reinforcement has been placed.<br />
Rib: Reinforcing member of a fabricated or molded part.<br />
Ribbon: The propensity of glass bundles to "stick" together and act as a strand or end.<br />
RIM: see Reaction Injection Molding.<br />
Room Temperature Curing Adhesives: Adhesives that set to handling strength within an hour<br />
at 68 to 86 degrees F, and later reach full strength without heating.<br />
Roving: A collection of untwisted strands wound together into a doff (ball). It is also, another<br />
name for the fabrication process step.<br />
Roving Ball: A term used to describe the supply package offered to the winder. It consists of a<br />
number of ends or strands wound to a given outside diameter onto a length of cardboard tube.