All
| Term | Definition |
|---|---|
| Viscosity |
The measure of the resistance of a fluid to flow (either through a specific orifice or in a rotational viscometer). The absolute unit of viscosity measurement is the poise (or centipoise). Often expressed as kilopascal (kPa). |
| Viscous Flow |
A type of fluid movement in which all particles of the fluid flow in a straight line parallel to the axis of a containing pipe or channel, with little or no mixing or turbidity. |
| Vivak® |
Vivak is a transparent, thermoplastic sheet used widely in the point of purchase industry. VIVAK is the brand and market leader for PETG products. Among its advantages, VIVAK PETG products offer superior impact strength over acrylic and cost effectiveness compared to polycarbonate, and offers deep draws, complex die-cuts, and precise molded-in details without sacrificing structural integrity. It die-cuts and punches easily, and can be bonded or fastened with adhesives, ultrasonic welding, or rivets. In addition, VIVAK is easily decorated by painting, silk screening, or hot stamping. Easy to fabricate, form, bond, and decorate, VIVAK PETG sheet products are well suited for a variety of point of purchase and other applications. Vivak is a registered trademark of Sheffield Plastics Inc. |
| Void |
1.An unfilled space in a cellular plastic substantially larger than the characteristic individual cells. 2. An empty space in any material or medium. |
| Volatile |
Capable of being driven off as a vapor at room or slightly elevated temperatures. |
| Volatile Content |
The percent of volatiles, which are driven off as, vapor from a plastic or impregnated reinforcement. |
| Volatile Loss |
The loss in weight of substance caused by vaporization of a constituent. |
| Warp |
Dimensional distortion in a plastic object after molding or other fabrication due to the release of molded in stresses. |
| Water Vapor Transmission |
The amount of water vapor passing through a given area and thickness of a plastic sheet or film in a given time, when the sheet or film is maintained at a constant temperature and when its faces are exposed to certain different relative humidities. The result is usually expressed as grams per 24 hours per square meter. |
| Weatherometer (Wom) |
An instrument, which is used to subject articles to accelerated weathering conditions, e.g., rich UV source and water spray. |
| Web |
1.A thin sheet in process in a machine. In extrusion coating, the molten web is that which issues from the die, and the substrate web is the material being coated. 2. A continuous length of sheet material handled in roll form as contrasted with the same material cut into sheets. |
| Weight-Average Molecular Weight (Mw) |
The first moment of a plot of the weight of the polymer in each molecular weight range against molecular weight. The value of MW can be estimated by light scattering or sedimentation equilibrium measurements. |
| Weld Line |
A flaw on a molded plastic article or blown film caused by the incomplete fusion of two flow fronts which meet during the molding or extrusion operation. |
| WF |
Workflow in SAP |
| Width of the alley |
Distance between 2 storing area |
| Work-in-process |
Product subjected to the various stages of the manufacturing process, included between raw material and finished product. |
| Workflow |
Software allowing to manage a process to be realized by a certain number of people. |
| Wrinkle |
A surface imperfection in plastic films that has the appearance of a crease or wrinkle. |
| Yard |
A classification, storage or switching area. |
| Yellowness Index |
A measure of the tendency of plastics to turn yellow upon long-term exposure to light or heat. |
| Yield Point |
In tensile testing, yield point is the first point on the stress-strain curve at which an increase in strain occurs without an increase in stress. This is the point of which permanent deformation of the stressed specimen begins to take place. |
| Yield Strength |
The stress at the yield point of a specimen usually expressed in pounds per square inch or megapascals. |
| Ziegler Catalysts |
A large group of catalysts made by reacting a compound of a transition metal chosen from groups IV through VII of the periodic table with an alkyl, hydride, or other compound of a metal from groups I through III. A typical example is the reaction product of an aluminum alkyl with titanium tetrachloride or titanium trichcloride. These catalysts were first developed by the German scientist Karl Ziegler for the polymerization of ethylene. Subsequent work by G.Natta showed that these and similar catalysts are useful for preparing stereoregular polyolefins. Thus, the family of catalysts is sometimes called Ziegler-Natta catalysts. |
| Zinc Oxide |
An amorphous white or yellowish powder, used as a pigment in plastics. It is said to have the greatest ultra-violet light absorbing power of all commercially available pigments. |
| Zinc Stearate |
A white powder used as a lubricant and antioxidant synergist. |