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Term |
Definition |
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Waist
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The central portion of a container which has a smaller cross section than the adjacent areas.
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Warpage
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Dimensional distortion is a plastic object after moulding.
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Water Absorption, 24 hours
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The percentage of water absorbed by a material when immersed in water for 24 hours; water absorbed in a material chiefly affects its electrical properties.
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Weatherometer
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An instrument which is utilized to subject articles to accelerated weathering conditions, eg rich UV source and water spray.
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Web
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A thin sheet in process in a machine. The molten web is that which issues from the die. The substrate web is the substrate being coated.
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Weld Lines
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A mark on a container caused by incomplete fusion of two streams of molten polymer. See Spider Lines.
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Weld Mark (also Flow Line)
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A mark on a moulded plastics piece made by the meeting of two flow fronts during the moulding operation.
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Welding
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Joining thermoplastic pieces by one of several heat-softening processes. In hot-gas welding, the material is heated by a jet of hot air or inert gas directed from a welding torch onto the area of contact of the surfaces which are being welded. Welding operations to which this method is applied normally require the use of a filler rod. In Spin-Welding the heat is generated by friction. Welding also includes heat sealing and the terms are synonymous in some foreign countries including Britain.
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Wet Lay-up
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A reinforced plastic manufacturing process where the polymer compound is applied as a liquid as the reinforcement is put into place.
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Wet Strength
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The strength of paper when saturated with water, especially used in discussions of processes whereby the strength of paper is increased by the addition, in manufacture , of plastics resins. Also, the strength of an adhesive joint determined immediately after removal from a liquid in which it has been immersed under specified conditions of time, temperature, and pressure.
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Wet Winding
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A fiber reinforcement material is coated with a polymer compound as a liquid prior to wrapping on a mandrel in the filament wound manufacturing process.
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Wetting Agent
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Wetting is produced when this surface active agent decreases the cohesion within a liquid. For wetting to occur, the adhesive force between the two phases (solid and liquid) is greater than the cohesive force within the liquid.
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Whisker
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A single-crystal, short fiber.
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Window
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A defect in a thermoplastics film, sheet or moulding, caused by the incomplete plasticization of a piece of material during processing. It appears as a globule in an otherwise blended mass. See also Fish Eye.
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Wire Train
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The entire assembly which is utilized to produce a resin-coated wire which normally consists of an extruder, a crosshead and a die, cooling means, and feed and takeup spools for the wire.
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Wood Model
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A model of a container made from wood to assist in the design of a container.
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Working Life
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The period of time during which a liquid resin or adhesive, after mixing with catalyst, solvent, or other compounding ingredients, remains usable.
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Wrinkle
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An imperfection in reinforced plastics that has the appearance of a wave moulded into one or more plies of fabric or other reinforcing material.
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